[Objectives]This study was conducted to clarify the enrichment and paucity of trace elements in the soil environment of peach orchards in Zunyi City,and to provide reference for supplementary application of microeleme...[Objectives]This study was conducted to clarify the enrichment and paucity of trace elements in the soil environment of peach orchards in Zunyi City,and to provide reference for supplementary application of microelement fertilizers and high-quality peach production in peach orchards.[Methods]Taking the soil of three typical peach orchards(Taoli Renjia peach orchard,Pengrui peach orchard and Taohuadao peach orchard)in Shenxi Town,Honghuagang District,Zunyi City as the research object,the contents of trace elements in soil were analyzed through field sampling and indoor determination of trace elements.[Results]The effective contents of trace elements in the soil of peach orchard bases in the study area were at a medium level,and the soil of the peach orchards was rich in available Fe and Se.The contents of available Cu,Mo and Mn were relatively rich.The contents of available B were not high overall.The contents of available Zn were at a moderate to low level overall.The soil of Taoli Renjia peach orchard was relatively rich in trace elements.[Conclusions]The research results can provide a scientific basis for the production of high-quality crispy peaches in peach orchards.展开更多
Based on output-oriented education,the OBE(Outcome-Based Education)concept integrates local red culture into the ideological and political course of environmental disciplines,and is an important part of training appli...Based on output-oriented education,the OBE(Outcome-Based Education)concept integrates local red culture into the ideological and political course of environmental disciplines,and is an important part of training applied talents of environmental disciplines in the new era.This educational model makes an innovation on the traditional educational and teaching concepts and centers on students.This paper analyzes the value of integrating local red culture into the ideological and political course under the OBE concept,and puts forward an effective implementation path.展开更多
In order to grasp the research status of different fertilization modes in China s farmland more comprehensively, with papers in core journals of Chinese Peking University collected in CNKI database from 2003 to 2022 a...In order to grasp the research status of different fertilization modes in China s farmland more comprehensively, with papers in core journals of Chinese Peking University collected in CNKI database from 2003 to 2022 as the main research object, this paper analyzed the research status of different fertilization modes from the perspectives of annual number of published papers, published journals, keywords and highly cited papers applying the bibliometrics research method. This study provides reference for the research in this field.展开更多
Localization plays a vital role in the mobile robot navigation system and is a fundamental capability for the following path planning task.In an indoor environment where the global positioning system signal fails or b...Localization plays a vital role in the mobile robot navigation system and is a fundamental capability for the following path planning task.In an indoor environment where the global positioning system signal fails or becomes weak,the wireless sensor network(WSN)or simultaneous localization and mapping(SLAM)scheme gradually becomes a research hot spot.WSN method uses received signal strength indicator(RSSI)values to determine the position of the target signal node,however,the orientation of the target node is not clear.Besides,the distance error is large when the indoor signal receives interference.The laser SLAM-based method usually uses a 2D laser Lidar to build an occupancy grid map,then locates the robot according to the known grid map.Unfortunately,this scheme only works effectively in those areas with salient geometrical features.The traditional particle filter always fails for areas with similar structures,such as a long corridor.To solve their shortcomings,this paper proposes a novel coarse-to-fine paradigm that uses WSN to assist mobile robot localization in a geometrically similar environment.Firstly,the fingerprints database is built in the offline stage to get reference distance information.The distance data is determined by the statistical mean value of multiple RSSI values.Secondly,a hybrid map with grid cells and RSSI values is constructed when the mobile robot moves from a starting point to the ending place.Thirdly,the RSSI values are thought of as a basic reference to get a coarse localization.Finally,an improved particle filteringmethod is presented to achieve fine localization.Experimental results demonstrate that our approach is effective and robust for global localization.The localization success rate reaches 97.0%and the average moving distance is only 0.74 meters,while the traditional method always fails.In addition,the method also works well when the mobile robot is kidnapped to another position in the environment.展开更多
From the Owens Valley Radio Observatory 40 m radio telescope,we have collected the light curves of the 15 GHz radio band for FSRQ J0153-1153,spanning from 2009 February to 2018 February.The Lomb-Scargle Periodogram me...From the Owens Valley Radio Observatory 40 m radio telescope,we have collected the light curves of the 15 GHz radio band for FSRQ J0153-1153,spanning from 2009 February to 2018 February.The Lomb-Scargle Periodogram method and the Weighted Wavelet Z-transform method are employed to search for the quasi-periodic oscillation(QPO)signal of these data,and the simulation method for the light curve is utilized to estimate the significance level of this QPO signal;thus through these techniques,the QPO signal of 3.7±0.5 yr with a significance level of 3.68σis revealed for the first time.It is most likely an explanation for the QPO signal that a binary black hole system gives rise to a Newtonian-driven the precession of jet.Based on this assumption,we find that the mass of the secondary black hole in this system may be larger than the mass of the primary black hole;and we estimate the intrinsic QPO of jet precession and the QPO of companion star orbit.展开更多
Local red culture is an important educational resource.Integrating it into the course of agronomy majors is an important part of cultivating applied talents who grasp and love agriculture in the new era.This paper ana...Local red culture is an important educational resource.Integrating it into the course of agronomy majors is an important part of cultivating applied talents who grasp and love agriculture in the new era.This paper analyzes the necessity of integrating local red culture into courses of agronomy majors,discusses the current challenges,and puts forward specific recommendations.展开更多
In this study,we comprehensively investigated charged AdS black holes surrounded by a distinct form of dark matter.In particular,we focused on key elements including the Hawking temperature,quasi-normal modes(QNMs),em...In this study,we comprehensively investigated charged AdS black holes surrounded by a distinct form of dark matter.In particular,we focused on key elements including the Hawking temperature,quasi-normal modes(QNMs),emission rate,and shadow.We first calculated the Hawking temperature,thereby identifying critical values such as the critical radius and maximum temperature of the black hole,essential for determining its phase transition.Further analysis focused on the QNMs of charged AdS black holes immersed in perfect fluid dark matter(PFDM)within the massless scalar field paradigm.Employing the Wentzel-Kramers-Brillouin(WKB)method,we accurately derived the frequencies of these QNMs.Additionally,we conducted a meticulous assessment of how the intensity of the PFDM parameterαinfluences the partial absorption cross sections of the black hole,along with a detailed study of the frequency variation of the energy emission rate.The pivotal role of geodesics in understanding astrophysical black hole characteristics is highlighted.Specifically,we examined the influence of the dark matter parameter on photon evolution by computing the shadow radius of the black hole.Our findings distinctly demonstrate the significant impact of the PFDM parameterαon the boundaries of this shadow,providing crucial insights into its features and interactions.We also provide profound insights into the intricate dynamics between a charged AdS black hole,novel dark matter,and various physical phenomena,elucidating their interplay and contributing valuable knowledge to the understanding of these cosmic entities.展开更多
The chemical compositions of tea(Camellia sinensis)are affected by numerous factors,such as cultivar,climate,leaf position,and cultivation pattern.However,under the same conditions,the chemical compositions are mainly...The chemical compositions of tea(Camellia sinensis)are affected by numerous factors,such as cultivar,climate,leaf position,and cultivation pattern.However,under the same conditions,the chemical compositions are mainly determined by varieties.Therefore,we investigated the genetic diversity of chemical compositions of tea tree resources in China to screen excellent germplasm resources.Three chemical compositions index(including chlorophyll index,flavonoid index,and anthocyanin index)and the nitrogen balance index of tea leaves were measured in 102 tea germplasms planted in Chinese Tea Plants Improved Variety Germplasm Resources Nursery(CTPIVGRN)by Dualex on April 152019.Results showed that the chlorophyll,flavonoid,and anthocyanin contents and the nitrogen balance index significantly differed between the 102 tea germplasms.The genetic diversity index values were 2.005,2.246,1.599,and 1.838,and the average genetic diversity was 1.922.The 102 tea germplasms can be divided into four categories by cluster analysis under the genetic distance threshold of 11.These results suggest that the genetic diversity of tea germplasm resources in China is rich.This study’s results can serve as a basis for the diversified development and utilization of tea plant.展开更多
[Objectives]This study was conducted to deeply analyze the research status in the field of soil fertility evaluation.[Methods]With the core journals of Peking University included in CNKI database from 2002 to 2021 as ...[Objectives]This study was conducted to deeply analyze the research status in the field of soil fertility evaluation.[Methods]With the core journals of Peking University included in CNKI database from 2002 to 2021 as the research object,papers were searched in the advanced search mode using SU=‘soil fertility’and SU=‘evaluation’as the retrieval subject terms and analyzed by the bibliometric research method,from three perspectives,namely,the annual number of papers published,the number of papers issued by authors and the number of highly cited papers.[Results]A total of 891 first authors issued 990 papers related to soil fertility evaluation in total from 2002 to 2021,with an average annual number of papers published at about 50,and the number of published papers showed a trend of rapidly increasing first and then gradually stabilizing.The top 13 authors published 3-4 papers,including Yang Xiaojuan,Chen Haisheng and Li Xinju(4 papers)ranking first.The top 10 papers with the highest citation frequency were published in 9 journals,respectively covering ecology,forestry,agriculture,geography,engineering and other fields,which shows that there are many kinds of journals focusing on the research field of soil fertility evaluation.[Conclusions]The results can provide reference for further research on soil fertility evaluation.展开更多
In order to better promote the development of the Cordyceps militaris industry,the C.militaris cultivation device was optimized.Multiple layers of bearing plates are arranged on a support frame,and six cultivation box...In order to better promote the development of the Cordyceps militaris industry,the C.militaris cultivation device was optimized.Multiple layers of bearing plates are arranged on a support frame,and six cultivation boxes are placed on each layer of bearing plate.The optimized device improves the cultivation method of C.militaris,improves the space utilization rate,and can greatly increase the output of C.militaris.Meanwhile,combining with local special R.roxburghii in Guizhou,a C.militaris and R.roxburghii compound drink were developed,which extends the industrial chain of C.militaris,which meets the current social needs and has good market prospects.The research results can promote rural industrial revolution and further help the revitalization of rural industries.展开更多
[Objectives]This study was conducted to gain an in-depth understanding of the research status of fields related to soil aggregates.[Methods]The academic papers published from 2001 to 2020 in the field of soil aggregat...[Objectives]This study was conducted to gain an in-depth understanding of the research status of fields related to soil aggregates.[Methods]The academic papers published from 2001 to 2020 in the field of soil aggregates were searched in the CNKI database serving as the statistical source using the subject terms"soil"and"aggregate"under advanced search,and visually analyzed by bibliometric statistical methods,from the perspectives of the annual number of published papers,the number of papers published by authors,and highly cited papers.[Results]The trend of the number of published papers in the past 20 years was mainly divided into three stages:2001-2007,2008-2016,and 2017-2020.There were 192 first authors in the literature related to soil aggregates.The authors with the top 3 published papers were Wang Erli,Zhang Zhengxiong,Li Yangbing,and Yang Yonghui(tied for third).Three highly cited papers were published in journals related to"ecology",and the top 10 most cited papers focused on the"formation and stability"of soil aggregates and the relationship between aggregates and soil organic matter and biochar.[Conclusions]This study can provide reference for further research on soil aggregates.展开更多
In order to further improve soil porosity and improve soil physical properties,the raw materials,formula and application methods of soil amendment were optimized,and the pH and porosity of yellow soil were compared an...In order to further improve soil porosity and improve soil physical properties,the raw materials,formula and application methods of soil amendment were optimized,and the pH and porosity of yellow soil were compared and analyzed after application of soil amendment.The results showed that the application of amendments increased soil pH and porosity.The results will provide the scientific basis for the improvement of soil porosity.展开更多
Rice planting decreased total iron but increased active iron.Iron activation varied greatly among different paddy soils but not in woodland soils.Paddy soil iron was mainly affected by pH,SOC and particle composition....Rice planting decreased total iron but increased active iron.Iron activation varied greatly among different paddy soils but not in woodland soils.Paddy soil iron was mainly affected by pH,SOC and particle composition.The decrease of soil Fe was mainly in the form of Fec and was closely related to SOC.展开更多
By considering the concept of a unified single fluid model,referred to as modified Chaplygin gas(MCG),which amalgamates dark energy and dark matter,we explore the thermodynamic characteristics of charged anti-de Sitte...By considering the concept of a unified single fluid model,referred to as modified Chaplygin gas(MCG),which amalgamates dark energy and dark matter,we explore the thermodynamic characteristics of charged anti-de Sitter(AdS)black holes existing in an unconventional fluid accompanied by MCG.To accomplish this objective,we derive the equations of state by regarding the charge Q^(2) as a thermodynamic variable.The effects of MCG parameters on the critical thermodynamic quantities(ψ_(c),T_(c),Q_(c)^(2))are examined,followed by a detailed analysis of the Q^(2)-ψ diagram.To provide a clearer explanation of the phase transition,we present an analysis of the Gibbs free energy.It is important to note that if the Hawking temperature exceeds the critical temperature,a distinct pattern is observed known as swallowtail behavior.This indicates that the system undergoes a first-order phase transition from a smaller black hole to a larger one.The critical exponent of the system is found to be in complete agreement with that of the van der Waals fluid system.Furthermore,we investigate the impact of MCG parameters and black hole charge on Joule-Thomson(J-T)expansion in the extended phase space.The J-T coefficient is examined to pinpoint the exact region experiencing cooling or heating,and the observation reveals that the presence of negative heat capacity results in the occurrence of a cooling process.The impact of MCG on the inversion curve of charged black holes exhibits a striking resemblance to that observed in most multi-dimensional black hole systems.In addition,it is worth noting that certain parameters exert a significant influence on the ratio T_(min)/Tc.For specific values of the MCG parameters,the ratio is consistent with the charged AdS black hole.The parametersγandβhave a non-negligible effect on the isenthalpic curve.展开更多
Insects often face both conditions with sufficient nutrients and conditions of undernutrition in the field.Through gustatory receptors,insects sense nutrients and regulate their physiological functions such as feeding...Insects often face both conditions with sufficient nutrients and conditions of undernutrition in the field.Through gustatory receptors,insects sense nutrients and regulate their physiological functions such as feeding and reproduction.However,it remains unclear whether signaling pathways activated by gustatory receptors depend on the concentration of nutrients and whether the difference in signaling pathways directly affects insects’physiological functions.Herein,we found that a sugar gustatory receptor,NlGr11,from the brown planthopper(BPH),Nilaparvata lugens,activated G protein-coupled signaling and ionotropic pathways when bound to high galactose concentration.BPHs subsequently demonstrated longer feeding times,feeding loads,and higher vitellogenin(NlVg)expression than BPHs exposed to high galactose concentrations,which only activated the ionotropic pathway.For the first time,our findings link plant nutrient conditions,signaling pathways activated by nutrients,and their gustatory receptors,and nutrient dose-dependent feeding efficacy and vitellogenin(Vg)expression in an insect.This will help us to better understand the molecular mechanism for insect feeding strategies on plants at different stages of nutritional conditions.展开更多
Localization plays a vital role in the mobile robot navigation system and is a fundamental capability for autonomous movement.In an indoor environment,the current mainstream localization scheme uses two-dimensional(2D...Localization plays a vital role in the mobile robot navigation system and is a fundamental capability for autonomous movement.In an indoor environment,the current mainstream localization scheme uses two-dimensional(2D)laser light detection and ranging(LiDAR)to build an occupancy grid map with simultaneous localization and mapping(SLAM)technology;it then locates the robot based on the known grid map.However,such solutions work effectively only in those areas with salient geometrical features.For areas with repeated,symmetrical,or similar structures,such as a long corridor,the conventional particle filtering method will fail.To solve this crucial problem,this paper presents a novel coarse-to-fine paradigm that uses visual features to assist mobile robot localization in a long corridor.First,the mobile robot is remote-controlled to move from the starting position to the end along a middle line.In the moving process,a grid map is built using the laser-based SLAM method.At the same time,a visual map consisting of special images which are keyframes is created according to a keyframe selection strategy.The keyframes are associated with the robot’s poses through timestamps.Second,a moving strategy is proposed,based on the extracted range features of the laser scans,to decide on an initial rough position.This is vital for the mobile robot because it gives instructions on where the robot needs to move to adjust its pose.Third,the mobile robot captures images in a proper perspective according to the moving strategy and matches them with the image map to achieve a coarse localization.Finally,an improved particle filtering method is presented to achieve fine localization.Experimental results show that our method is effective and robust for global localization.The localization success rate reaches 98.8%while the average moving distance is only 0.31 m.In addition,the method works well when the mobile robot is kidnapped to another position in the corridor.展开更多
Based on the Einstein-Maxwell theory,the Joule-Thomson(J-T)expansion of charged dilatonic black holes(the solutions are neither flat nor AdS)in(n+1)-dimensional spacetime is studied herein.To this end,we analyze the e...Based on the Einstein-Maxwell theory,the Joule-Thomson(J-T)expansion of charged dilatonic black holes(the solutions are neither flat nor AdS)in(n+1)-dimensional spacetime is studied herein.To this end,we analyze the effects of the dimension n and dilaton fieldαon J-T expansion.An explicit expression for the J-T coefficient is derived,and consequently,a negative heat capacity is found to lead to a cooling process.In contrast to its effect on the dimension,the inversion curve decreases with charge Q at low pressures,whereas the opposite effect is observed at high pressures.We can observe that with an increase in the dimension n or parameter a,both the pressure cut-off point and the minimum inversion temperature T_(min)change.Moreover,we analyze the ratio T_(min)/T_(c)numerically and discover that the ratio is independent of charge;however,it depends on the dilaton field and dimension:for n=3 andα=0,the ratio is 1/2.The dilaton field is found to enhance the ratio.In addition,we identify the cooling-heating regions by investigating the inversion and isenthalpic curves,and the behavior of the minimum inversion mass M_(min)indicates that this cooling-heating transition may not occur under certain special conditions.展开更多
Motivated by the recent discoveries of the hidden charm exotic state with strangeness by the BESⅢand LHCb Collaborations,we study the S-wave hidden bottom tetraquark with strangeness in two kinds of quark models.Both...Motivated by the recent discoveries of the hidden charm exotic state with strangeness by the BESⅢand LHCb Collaborations,we study the S-wave hidden bottom tetraquark with strangeness in two kinds of quark models.Both meson-meson and diquarkantidiquark configurations are taken into account.The numerical results indicate that there is no bound state in both quark models.However,several resonance states have been predicted.Three resonance states with I(JP)=1/2(0+)are found,the energy ranges of which are 10479-10550,10528-10632,and 10597-10681 MeV,respectively.Three resonance states with I(JP)=1/2(1+)are predicted to be located at 10491-10675,10502-10679,and 10522-10723 MeV,respectively.Moreover,there also exists a resonance with I(JP)=1/2(2+)and the mass is estimated to be 10531-10680 MeV.Besides,the decay widths of these predicted resonances are calculated.All these predicted states in the present work should be accessible for further experiments in LHCb.展开更多
Recently,some progress has been made in the experiments on double-heavy tetraquarks,such as T_(cc)reported by the LHCb Collaboration and Xccssreported by the Belle Collaboration.Coming on the heels of our previous wor...Recently,some progress has been made in the experiments on double-heavy tetraquarks,such as T_(cc)reported by the LHCb Collaboration and Xccssreported by the Belle Collaboration.Coming on the heels of our previous work about T_(cc) and T_(bb), we present a study on the bound and resonance states of their companions,QQqs(Q=c,b;q=u,s) tetraquarks with strange flavor in the chiral quark model.Two pictures,meson-meson and diquark-antidiquark ones,and their couplings were considered in our calculations.Isospin violation was neglected herein.Our numerical analysis indicated that the states ccus with 1/2(1^(+)) ald bbus with 1/2(1^(+)) are the most promising stable states against strong interactions.Besides,we found several resonance states for the double-heavy strange tetraquarks with the real scaling method.展开更多
The eastern Sichuan-western Hunan and Hubei belt(ESWHHB) is an important fold-thrust belt in the Middle–Upper Yangtze region of China, and it is also an important area for petroleum and gas prospect in China. The inf...The eastern Sichuan-western Hunan and Hubei belt(ESWHHB) is an important fold-thrust belt in the Middle–Upper Yangtze region of China, and it is also an important area for petroleum and gas prospect in China. The influence of mechanical stratigraphy on the deformation evolution of the ESWHHB is a hot problem that has received widespread attention. However, due to the complexity of geological conditions, this issue has not been sufficiently addressed. Previews geological exploration studies show that the deformation evolution of the belt is closely related to the mechanical stratigraphy. Physical simulation has proven to be effective for studying the deformation evolution of fold-and-thrust belt. Based on the geological conditions of the ESWHHB, six groups of physical models were designed to analyze the influences of the ductile layer and overlap configuration on the structural deformation of the ESWHHB. The results show that the mechanical stratigraphy has significant control on the deformation evolution of the fold-thrust belt. The ESWHHB evolution is related to the lower viscosity of the ductile layer and the larger thickness of the ductile layer, while only gradual propagated fold-and-thrust belt can be resulted from the higher viscosity of the ductile layer and the smaller thickness of the ductile layer. Additionally, the overlap between the stratigraphy at various structural belts leads to significant differences in their mechanical properties, and it critically influences the structural patterns of the ESWHHB.展开更多
基金Supported by Zunyi City-School Joint Science and Technology R&D Fund (ZSKH HZ Z[2023]159)Natural Science Research Project of Guizhou Provincial Department of Education (QJJ[2022]067+3 种基金QJJ[2023]043)Guizhou Provincial Scientific Special Commissioner Innovation and Entrepreneurship Service Training Demonstration Base (HHG2023001)Zunyi Science and Technology Support Program (ZSKHZC NS[2023]15)Science and Technology Cooperation Project of Honghuagang District,Zunyi City (ZHKHSZ[2022]03)。
文摘[Objectives]This study was conducted to clarify the enrichment and paucity of trace elements in the soil environment of peach orchards in Zunyi City,and to provide reference for supplementary application of microelement fertilizers and high-quality peach production in peach orchards.[Methods]Taking the soil of three typical peach orchards(Taoli Renjia peach orchard,Pengrui peach orchard and Taohuadao peach orchard)in Shenxi Town,Honghuagang District,Zunyi City as the research object,the contents of trace elements in soil were analyzed through field sampling and indoor determination of trace elements.[Results]The effective contents of trace elements in the soil of peach orchard bases in the study area were at a medium level,and the soil of the peach orchards was rich in available Fe and Se.The contents of available Cu,Mo and Mn were relatively rich.The contents of available B were not high overall.The contents of available Zn were at a moderate to low level overall.The soil of Taoli Renjia peach orchard was relatively rich in trace elements.[Conclusions]The research results can provide a scientific basis for the production of high-quality crispy peaches in peach orchards.
基金Supported by Teaching Content and Curriculum System Reform Project of Guizhou Province in 2022(GZJG20220776)Natural Science Research Project of Guizhou Provincial Department of Education(Qianjiaoji[2022]No.067)+1 种基金Research Center for Revolutionary Spirit and Cultural Resources of the Communist Party of China,Zunyi Normal University,Key Research Base of Humanities and Social Sciences,Ministry of Education(22KRIZYPY12)Teaching Content and Curriculum System Reform and Cultivation Project of Zunyi Normal University in 2022(JGPY2022001).
文摘Based on output-oriented education,the OBE(Outcome-Based Education)concept integrates local red culture into the ideological and political course of environmental disciplines,and is an important part of training applied talents of environmental disciplines in the new era.This educational model makes an innovation on the traditional educational and teaching concepts and centers on students.This paper analyzes the value of integrating local red culture into the ideological and political course under the OBE concept,and puts forward an effective implementation path.
基金Supported by Undergraduate Training Program for Innovation and Entrepreneurship of Guizhou Province(S202310664011)Natural Science Research Project of Guizhou Provincial Department of Education(QJJ[2022]067,QJJ[2023]043)Teaching Content and Curriculum System Reform Project of Colleges and Universities in Guizhou Province(GZJG20220776)。
文摘In order to grasp the research status of different fertilization modes in China s farmland more comprehensively, with papers in core journals of Chinese Peking University collected in CNKI database from 2003 to 2022 as the main research object, this paper analyzed the research status of different fertilization modes from the perspectives of annual number of published papers, published journals, keywords and highly cited papers applying the bibliometrics research method. This study provides reference for the research in this field.
基金This paper is funded by the Key Laboratory Foundation of Guizhou Province Universities(QJJ[2002]No.059)The work is also supported by the Natural Science Research Project of Guizhou Province Education Department(Grant Number KY[2017]023,Guizhou Mountain Intelligent Agricultural Engineering Research Center)Doctoral Fund Research Project of Zunyi Normal University(Grant Number ZS BS[2016]01,Aerial Photography Test andApplication ofKarst Mountain Topography).
文摘Localization plays a vital role in the mobile robot navigation system and is a fundamental capability for the following path planning task.In an indoor environment where the global positioning system signal fails or becomes weak,the wireless sensor network(WSN)or simultaneous localization and mapping(SLAM)scheme gradually becomes a research hot spot.WSN method uses received signal strength indicator(RSSI)values to determine the position of the target signal node,however,the orientation of the target node is not clear.Besides,the distance error is large when the indoor signal receives interference.The laser SLAM-based method usually uses a 2D laser Lidar to build an occupancy grid map,then locates the robot according to the known grid map.Unfortunately,this scheme only works effectively in those areas with salient geometrical features.The traditional particle filter always fails for areas with similar structures,such as a long corridor.To solve their shortcomings,this paper proposes a novel coarse-to-fine paradigm that uses WSN to assist mobile robot localization in a geometrically similar environment.Firstly,the fingerprints database is built in the offline stage to get reference distance information.The distance data is determined by the statistical mean value of multiple RSSI values.Secondly,a hybrid map with grid cells and RSSI values is constructed when the mobile robot moves from a starting point to the ending place.Thirdly,the RSSI values are thought of as a basic reference to get a coarse localization.Finally,an improved particle filteringmethod is presented to achieve fine localization.Experimental results demonstrate that our approach is effective and robust for global localization.The localization success rate reaches 97.0%and the average moving distance is only 0.74 meters,while the traditional method always fails.In addition,the method also works well when the mobile robot is kidnapped to another position in the environment.
基金supported by private funding from the California Institute of Technology and the Max Planck Institute for Radio Astronomyby NASA grants NNX08AW31G,NNX11A043G,and NNX14AQ89G and NSF grants AST0808050 and AST-1109911+4 种基金partially supported by the regional first-class discipline of Guizhou province(QJKYF[2018]216)major research projects for innovation groups in Guizhou province(Grant No.KY[2018]028)Electronic Manufacturing Industry-University-Research Base of Ordinary Colleges and Universities in Guizhou Province(Qianjiaohe KY Zi[2014]No.230-3,Youth Foundation of the Education Department of Guizhou Province(No.KY[2017]248)Guizhou Science and Technology Department(QKHJC[2019]1323)Talent base for R&D of new optoelectronic materials and electronic devices。
文摘From the Owens Valley Radio Observatory 40 m radio telescope,we have collected the light curves of the 15 GHz radio band for FSRQ J0153-1153,spanning from 2009 February to 2018 February.The Lomb-Scargle Periodogram method and the Weighted Wavelet Z-transform method are employed to search for the quasi-periodic oscillation(QPO)signal of these data,and the simulation method for the light curve is utilized to estimate the significance level of this QPO signal;thus through these techniques,the QPO signal of 3.7±0.5 yr with a significance level of 3.68σis revealed for the first time.It is most likely an explanation for the QPO signal that a binary black hole system gives rise to a Newtonian-driven the precession of jet.Based on this assumption,we find that the mass of the secondary black hole in this system may be larger than the mass of the primary black hole;and we estimate the intrinsic QPO of jet precession and the QPO of companion star orbit.
基金Supported by Project of Key Research Base of Humanities and Social Sciences,Ministry of Education and Research Center Base for Revolutionary Spirit and Cultural Resources of the Communist Party of China in Zunyi Normal University(22KRIZYPY12)Teaching Content and Curriculum System Reform and Cultivation Project of Zunyi Normal University in 2022(JGPY2022001)+1 种基金Teaching Content and Curriculum System Reform Project of Guizhou Province in 2022(GZJG20220776)Guizhou Provincial Higher Education Institutions Qianbei Modern Mountain High-efficiency Agricultural Scientific and Technological Achievements Transfer and Transformation Service Rural Revitalization Demonstration Base(Qian Jiao Ji[2022]No.067).
文摘Local red culture is an important educational resource.Integrating it into the course of agronomy majors is an important part of cultivating applied talents who grasp and love agriculture in the new era.This paper analyzes the necessity of integrating local red culture into courses of agronomy majors,discusses the current challenges,and puts forward specific recommendations.
基金Supported by the Doctoral Foundation of Zunyi Normal University of China(BS[2022]07,QJJ-[2022]-314)the National Natural Science Foundation of China(12265007)+1 种基金supported by 20230316 and 20240220-SIP-IPN,Mexico,and began this work with permission from IPN for a research stay in Chinapartially supported by the Long-Term Conceptual Development of a University of Hradec Kralove for 2023,issued by the Ministry of Education,Youth,and Sports of the Czech Republic。
文摘In this study,we comprehensively investigated charged AdS black holes surrounded by a distinct form of dark matter.In particular,we focused on key elements including the Hawking temperature,quasi-normal modes(QNMs),emission rate,and shadow.We first calculated the Hawking temperature,thereby identifying critical values such as the critical radius and maximum temperature of the black hole,essential for determining its phase transition.Further analysis focused on the QNMs of charged AdS black holes immersed in perfect fluid dark matter(PFDM)within the massless scalar field paradigm.Employing the Wentzel-Kramers-Brillouin(WKB)method,we accurately derived the frequencies of these QNMs.Additionally,we conducted a meticulous assessment of how the intensity of the PFDM parameterαinfluences the partial absorption cross sections of the black hole,along with a detailed study of the frequency variation of the energy emission rate.The pivotal role of geodesics in understanding astrophysical black hole characteristics is highlighted.Specifically,we examined the influence of the dark matter parameter on photon evolution by computing the shadow radius of the black hole.Our findings distinctly demonstrate the significant impact of the PFDM parameterαon the boundaries of this shadow,providing crucial insights into its features and interactions.We also provide profound insights into the intricate dynamics between a charged AdS black hole,novel dark matter,and various physical phenomena,elucidating their interplay and contributing valuable knowledge to the understanding of these cosmic entities.
基金funded by supporting Project No.Qian ke he[2020]1Y71PhD Fund Project No.Zunshi 138[2019]22+2 种基金Education Department of Guizhou Province Scientific Research Project No.Qianjiaohe KY word 2017-023Zunyi City Science and Technology Bureau Project(Zunshike rencai 2020-2Zunshikehe HZ word 2020-15).
文摘The chemical compositions of tea(Camellia sinensis)are affected by numerous factors,such as cultivar,climate,leaf position,and cultivation pattern.However,under the same conditions,the chemical compositions are mainly determined by varieties.Therefore,we investigated the genetic diversity of chemical compositions of tea tree resources in China to screen excellent germplasm resources.Three chemical compositions index(including chlorophyll index,flavonoid index,and anthocyanin index)and the nitrogen balance index of tea leaves were measured in 102 tea germplasms planted in Chinese Tea Plants Improved Variety Germplasm Resources Nursery(CTPIVGRN)by Dualex on April 152019.Results showed that the chlorophyll,flavonoid,and anthocyanin contents and the nitrogen balance index significantly differed between the 102 tea germplasms.The genetic diversity index values were 2.005,2.246,1.599,and 1.838,and the average genetic diversity was 1.922.The 102 tea germplasms can be divided into four categories by cluster analysis under the genetic distance threshold of 11.These results suggest that the genetic diversity of tea germplasm resources in China is rich.This study’s results can serve as a basis for the diversified development and utilization of tea plant.
基金Supported by National Innovation and Entrepreneurship Training Program for College Students(202210664022)Natural Science Research Project of Guizhou Provincial Department of Education of Guizhou Province(QJZ[2022]067)Reform Project of Teaching Content and Curriculum System of Colleges and Universities in Guizhou Province(GZJG20220776).
文摘[Objectives]This study was conducted to deeply analyze the research status in the field of soil fertility evaluation.[Methods]With the core journals of Peking University included in CNKI database from 2002 to 2021 as the research object,papers were searched in the advanced search mode using SU=‘soil fertility’and SU=‘evaluation’as the retrieval subject terms and analyzed by the bibliometric research method,from three perspectives,namely,the annual number of papers published,the number of papers issued by authors and the number of highly cited papers.[Results]A total of 891 first authors issued 990 papers related to soil fertility evaluation in total from 2002 to 2021,with an average annual number of papers published at about 50,and the number of published papers showed a trend of rapidly increasing first and then gradually stabilizing.The top 13 authors published 3-4 papers,including Yang Xiaojuan,Chen Haisheng and Li Xinju(4 papers)ranking first.The top 10 papers with the highest citation frequency were published in 9 journals,respectively covering ecology,forestry,agriculture,geography,engineering and other fields,which shows that there are many kinds of journals focusing on the research field of soil fertility evaluation.[Conclusions]The results can provide reference for further research on soil fertility evaluation.
基金Supported by Guizhou Provincial Education Department Youth Science and Technology Talent Growth Project(QJH KY Z[2018]314)Zunyi City-School Joint Science and Technology R&D Fund Project(ZSKH HZ Z[2020]12)+2 种基金Zunyi Normal University Scientific Research Project-Serving Rural Industrial Revolution(ZSHNCCYZ 201912)Zunyi Normal University Scientific Research Project-Serving Rural Industrial Revolution(ZSHDFCYZ[2020]10)Guizhou Provincial Education Department Colleges and Universities Scientific Research Project-Serving Rural Industrial Revolution(2018-91).
文摘In order to better promote the development of the Cordyceps militaris industry,the C.militaris cultivation device was optimized.Multiple layers of bearing plates are arranged on a support frame,and six cultivation boxes are placed on each layer of bearing plate.The optimized device improves the cultivation method of C.militaris,improves the space utilization rate,and can greatly increase the output of C.militaris.Meanwhile,combining with local special R.roxburghii in Guizhou,a C.militaris and R.roxburghii compound drink were developed,which extends the industrial chain of C.militaris,which meets the current social needs and has good market prospects.The research results can promote rural industrial revolution and further help the revitalization of rural industries.
基金2020 New Academic Talent Cultivation and Innovative Exploration Project Cultivation Project of Zunyi Normal University(ZS XM[2020]1-04)"2021 Rural Revitalization Special Project"of Zunyi Normal University(QJH KY Z[2016]018-2)+1 种基金2017 New Academic Talent Cultivation and Innovative Exploration Project Cultivation Project of Zunyi Normal University(QKHPTRC[2017]5727-09)Key Laboratory of Soil Resources and Environmental Characteristics in Northern Guizhou(QJH KY Z[2017]010).
文摘[Objectives]This study was conducted to gain an in-depth understanding of the research status of fields related to soil aggregates.[Methods]The academic papers published from 2001 to 2020 in the field of soil aggregates were searched in the CNKI database serving as the statistical source using the subject terms"soil"and"aggregate"under advanced search,and visually analyzed by bibliometric statistical methods,from the perspectives of the annual number of published papers,the number of papers published by authors,and highly cited papers.[Results]The trend of the number of published papers in the past 20 years was mainly divided into three stages:2001-2007,2008-2016,and 2017-2020.There were 192 first authors in the literature related to soil aggregates.The authors with the top 3 published papers were Wang Erli,Zhang Zhengxiong,Li Yangbing,and Yang Yonghui(tied for third).Three highly cited papers were published in journals related to"ecology",and the top 10 most cited papers focused on the"formation and stability"of soil aggregates and the relationship between aggregates and soil organic matter and biochar.[Conclusions]This study can provide reference for further research on soil aggregates.
基金2017 Academic New Talent Cultivation and Innovation Exploration Project of Zunyi Normal University(QKHPTRC[2017]5727-09)2020 Academic New Talent Cultivation and Innovation Exploration Project of Zunyi Normal University(ZS XM[2020]1-04)+1 种基金2021 Rural Revitalization Special Project of Zunyi Normal University(QJH KY[2016]018-2)Key Laboratory of Soil Resources and Environment Characteristics in Northern Guizhou Province(QJH KY[2017]010).
文摘In order to further improve soil porosity and improve soil physical properties,the raw materials,formula and application methods of soil amendment were optimized,and the pH and porosity of yellow soil were compared and analyzed after application of soil amendment.The results showed that the application of amendments increased soil pH and porosity.The results will provide the scientific basis for the improvement of soil porosity.
基金financially supported by Scientific Research Fund of Hunan Provincial Education Department(Grant No.20A234)San’an Nie thanks the National Natural Science Foundation of China(Grant No.42177288)as well as the National Natural Science Foundation of Hunan Province,China(Grant No.2023JJ30307).
文摘Rice planting decreased total iron but increased active iron.Iron activation varied greatly among different paddy soils but not in woodland soils.Paddy soil iron was mainly affected by pH,SOC and particle composition.The decrease of soil Fe was mainly in the form of Fec and was closely related to SOC.
基金Supported by the Doctoral Foundation of Zunyi Normal University of China(BS[2022]07,QJJ-[2022]-314)the National Natural Science Foundation of China(12265007,12264061)partially was supported by the Long-Term Conceptual Development of a University of Hradec Královéfor 2023,issued by the Ministry of Education,Youth,and Sports of the Czech Republic。
文摘By considering the concept of a unified single fluid model,referred to as modified Chaplygin gas(MCG),which amalgamates dark energy and dark matter,we explore the thermodynamic characteristics of charged anti-de Sitter(AdS)black holes existing in an unconventional fluid accompanied by MCG.To accomplish this objective,we derive the equations of state by regarding the charge Q^(2) as a thermodynamic variable.The effects of MCG parameters on the critical thermodynamic quantities(ψ_(c),T_(c),Q_(c)^(2))are examined,followed by a detailed analysis of the Q^(2)-ψ diagram.To provide a clearer explanation of the phase transition,we present an analysis of the Gibbs free energy.It is important to note that if the Hawking temperature exceeds the critical temperature,a distinct pattern is observed known as swallowtail behavior.This indicates that the system undergoes a first-order phase transition from a smaller black hole to a larger one.The critical exponent of the system is found to be in complete agreement with that of the van der Waals fluid system.Furthermore,we investigate the impact of MCG parameters and black hole charge on Joule-Thomson(J-T)expansion in the extended phase space.The J-T coefficient is examined to pinpoint the exact region experiencing cooling or heating,and the observation reveals that the presence of negative heat capacity results in the occurrence of a cooling process.The impact of MCG on the inversion curve of charged black holes exhibits a striking resemblance to that observed in most multi-dimensional black hole systems.In addition,it is worth noting that certain parameters exert a significant influence on the ratio T_(min)/Tc.For specific values of the MCG parameters,the ratio is consistent with the charged AdS black hole.The parametersγandβhave a non-negligible effect on the isenthalpic curve.
基金supported by the National Natural Science Foundation of China(31730073,U1401212)Guizhou Science and Technology Project(qiankeheji-zk[2021]General 135).
文摘Insects often face both conditions with sufficient nutrients and conditions of undernutrition in the field.Through gustatory receptors,insects sense nutrients and regulate their physiological functions such as feeding and reproduction.However,it remains unclear whether signaling pathways activated by gustatory receptors depend on the concentration of nutrients and whether the difference in signaling pathways directly affects insects’physiological functions.Herein,we found that a sugar gustatory receptor,NlGr11,from the brown planthopper(BPH),Nilaparvata lugens,activated G protein-coupled signaling and ionotropic pathways when bound to high galactose concentration.BPHs subsequently demonstrated longer feeding times,feeding loads,and higher vitellogenin(NlVg)expression than BPHs exposed to high galactose concentrations,which only activated the ionotropic pathway.For the first time,our findings link plant nutrient conditions,signaling pathways activated by nutrients,and their gustatory receptors,and nutrient dose-dependent feeding efficacy and vitellogenin(Vg)expression in an insect.This will help us to better understand the molecular mechanism for insect feeding strategies on plants at different stages of nutritional conditions.
基金supported by the National Natural Science Foundation of China(Nos.61703067,61803058,51604056,and 51775076)the Science and Technology Research Project of Chongqing Education Commission,China(No.KJ1704072)the Doctoral Talent Train Project of Chongqing University of Posts and Telecommunications,China(No.BYJS202006)。
文摘Localization plays a vital role in the mobile robot navigation system and is a fundamental capability for autonomous movement.In an indoor environment,the current mainstream localization scheme uses two-dimensional(2D)laser light detection and ranging(LiDAR)to build an occupancy grid map with simultaneous localization and mapping(SLAM)technology;it then locates the robot based on the known grid map.However,such solutions work effectively only in those areas with salient geometrical features.For areas with repeated,symmetrical,or similar structures,such as a long corridor,the conventional particle filtering method will fail.To solve this crucial problem,this paper presents a novel coarse-to-fine paradigm that uses visual features to assist mobile robot localization in a long corridor.First,the mobile robot is remote-controlled to move from the starting position to the end along a middle line.In the moving process,a grid map is built using the laser-based SLAM method.At the same time,a visual map consisting of special images which are keyframes is created according to a keyframe selection strategy.The keyframes are associated with the robot’s poses through timestamps.Second,a moving strategy is proposed,based on the extracted range features of the laser scans,to decide on an initial rough position.This is vital for the mobile robot because it gives instructions on where the robot needs to move to adjust its pose.Third,the mobile robot captures images in a proper perspective according to the moving strategy and matches them with the image map to achieve a coarse localization.Finally,an improved particle filtering method is presented to achieve fine localization.Experimental results show that our method is effective and robust for global localization.The localization success rate reaches 98.8%while the average moving distance is only 0.31 m.In addition,the method works well when the mobile robot is kidnapped to another position in the corridor.
基金Supported by the National Natural Science Foundation of China(11465006,11565009)the Doctoral Foundation of Zunyi Normal University of China(BS[2022]07,QJJ-[2022]-314)。
文摘Based on the Einstein-Maxwell theory,the Joule-Thomson(J-T)expansion of charged dilatonic black holes(the solutions are neither flat nor AdS)in(n+1)-dimensional spacetime is studied herein.To this end,we analyze the effects of the dimension n and dilaton fieldαon J-T expansion.An explicit expression for the J-T coefficient is derived,and consequently,a negative heat capacity is found to lead to a cooling process.In contrast to its effect on the dimension,the inversion curve decreases with charge Q at low pressures,whereas the opposite effect is observed at high pressures.We can observe that with an increase in the dimension n or parameter a,both the pressure cut-off point and the minimum inversion temperature T_(min)change.Moreover,we analyze the ratio T_(min)/T_(c)numerically and discover that the ratio is independent of charge;however,it depends on the dilaton field and dimension:for n=3 andα=0,the ratio is 1/2.The dilaton field is found to enhance the ratio.In addition,we identify the cooling-heating regions by investigating the inversion and isenthalpic curves,and the behavior of the minimum inversion mass M_(min)indicates that this cooling-heating transition may not occur under certain special conditions.
基金supported by the National Natural Science Foundation of China(Grant Nos.12175037,11775050,11775118,11535005,and11865019)the Fundamental Research Funds for the Central Universities(Grant No.1107022104)the China Postdoctoral Science Foundation(Grant No.1107020201)。
文摘Motivated by the recent discoveries of the hidden charm exotic state with strangeness by the BESⅢand LHCb Collaborations,we study the S-wave hidden bottom tetraquark with strangeness in two kinds of quark models.Both meson-meson and diquarkantidiquark configurations are taken into account.The numerical results indicate that there is no bound state in both quark models.However,several resonance states have been predicted.Three resonance states with I(JP)=1/2(0+)are found,the energy ranges of which are 10479-10550,10528-10632,and 10597-10681 MeV,respectively.Three resonance states with I(JP)=1/2(1+)are predicted to be located at 10491-10675,10502-10679,and 10522-10723 MeV,respectively.Moreover,there also exists a resonance with I(JP)=1/2(2+)and the mass is estimated to be 10531-10680 MeV.Besides,the decay widths of these predicted resonances are calculated.All these predicted states in the present work should be accessible for further experiments in LHCb.
基金Supported partly by Natural Science Foundation of Jiangsu ProvinceChina (BK20221166)the National Natural Science Foundation of China (12205125,847145, 12205249, 1865019)。
文摘Recently,some progress has been made in the experiments on double-heavy tetraquarks,such as T_(cc)reported by the LHCb Collaboration and Xccssreported by the Belle Collaboration.Coming on the heels of our previous work about T_(cc) and T_(bb), we present a study on the bound and resonance states of their companions,QQqs(Q=c,b;q=u,s) tetraquarks with strange flavor in the chiral quark model.Two pictures,meson-meson and diquark-antidiquark ones,and their couplings were considered in our calculations.Isospin violation was neglected herein.Our numerical analysis indicated that the states ccus with 1/2(1^(+)) ald bbus with 1/2(1^(+)) are the most promising stable states against strong interactions.Besides,we found several resonance states for the double-heavy strange tetraquarks with the real scaling method.
基金supported by Project of the State Key Laboratory of Petroleum Resource and Prospecting,China University of PetroleumBeijing (No. PRP/Open-1903)the Zunyi Normal University Project (No. BS201804)。
文摘The eastern Sichuan-western Hunan and Hubei belt(ESWHHB) is an important fold-thrust belt in the Middle–Upper Yangtze region of China, and it is also an important area for petroleum and gas prospect in China. The influence of mechanical stratigraphy on the deformation evolution of the ESWHHB is a hot problem that has received widespread attention. However, due to the complexity of geological conditions, this issue has not been sufficiently addressed. Previews geological exploration studies show that the deformation evolution of the belt is closely related to the mechanical stratigraphy. Physical simulation has proven to be effective for studying the deformation evolution of fold-and-thrust belt. Based on the geological conditions of the ESWHHB, six groups of physical models were designed to analyze the influences of the ductile layer and overlap configuration on the structural deformation of the ESWHHB. The results show that the mechanical stratigraphy has significant control on the deformation evolution of the fold-thrust belt. The ESWHHB evolution is related to the lower viscosity of the ductile layer and the larger thickness of the ductile layer, while only gradual propagated fold-and-thrust belt can be resulted from the higher viscosity of the ductile layer and the smaller thickness of the ductile layer. Additionally, the overlap between the stratigraphy at various structural belts leads to significant differences in their mechanical properties, and it critically influences the structural patterns of the ESWHHB.
