Pomelo peel is a by-product from pomelo consumption, but it is also rich in a variety of nutrients and functional substances. In order to solve the environmental problems caused by the large amount of discarded pomelo...Pomelo peel is a by-product from pomelo consumption, but it is also rich in a variety of nutrients and functional substances. In order to solve the environmental problems caused by the large amount of discarded pomelo peels every year, in this study, we recycled pomelo peels to make pomelo yellow peel jelly (PYPJ) and pomelo white peel jelly (PWPJ) according to their different characteristics in pomelo peels. And the consumer sensory evaluation (n = 50) was carried out to explore the consumers’ evaluation and acceptance for these two innovative products. The results showed that both jellies received high mean scores for all sensory attributes expect PYPJ’ taste, and the consumer acceptances of PYPJ and PWPJ were 62% and 92%, respectively. These results displayed that there is a need to further improve PYPJ, and PWPJ is a product recognized by consumers. .展开更多
This study investigated the removal of hexavalent chromium(Cr(VI)) in aqueous solutions using pomelo peel(PP) and FeCl3-modified pomelo peel(FPP) as novel biomass adsorbents.Batch adsorption experiments were performed...This study investigated the removal of hexavalent chromium(Cr(VI)) in aqueous solutions using pomelo peel(PP) and FeCl3-modified pomelo peel(FPP) as novel biomass adsorbents.Batch adsorption experiments were performed to evaluate the effects of pH,time,temperature,initial concentration,and adsorbent dose on Cr(VI) removal by PP and FPP.The results show that the maximum adsorption capacity of Cr(VI)was 21.55 mg/g for FPP and 0.57 mg/g for PP at a pH of 2.0 and a temperature of 40℃.The surface shape,microstructure,and chemical composition of FPP were analyzed with scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),and energy dispersive spectroscopy(EDS),and compared with those of PP.The results show that the adsorption performance of FPP was much better than that of PP,indicating that FPP can be an alternative high-efficiency adsorbent for Cr(VI) removal.展开更多
The porous structure in pomelo peel is believed to be responsible for the protection of its fruit from damage during the free falling from a tree.The quantitative understanding of the relationship between the deformat...The porous structure in pomelo peel is believed to be responsible for the protection of its fruit from damage during the free falling from a tree.The quantitative understanding of the relationship between the deformation behavior and the porous structure could pave the way for the design of porous structures for efficient energy absorption.Here,a universal feature of pore distribution in pomelo peels along the radial direction is extracted from three varieties of pomelos,which shows strong correlation to the deformation behavior of the peels under compression.Guided by the porous design found in pomelo peels,porous polyether-ether-ketone(PEEK)cube is additively manufactured and possesses the highest ability to absorb energy during compression as compared to the non-pomelo-inspired geometries,which is further confirmed by the finite element simulation.The nature-optimized porous structure revealed here could guide the design of lightweight and high-energy-dissipating materials/devices.展开更多
Food intake has a great influence on blood glucose in patients with diabetes. This study was to determine the glycemic index(GI) and glycemic load(GL) of a particular pomelo named Majia pomelo and its effects on postp...Food intake has a great influence on blood glucose in patients with diabetes. This study was to determine the glycemic index(GI) and glycemic load(GL) of a particular pomelo named Majia pomelo and its effects on postprandial glucose(PPG) in patients with type 2 diabetes(T2D). Twenty healthy subjects and 20 T2D patients(controlled on lifestyle measures and/or metformin) were tested on 2 separate days with 50 g of glucose and 50 g equivalent of carbohydrates from Majia pomelo for GI measurement. To test effects of Majia pomelo on PPG, 19 hospitalized T2D patients(controlled on insulin therapy) were selected for a 9-day study. The dose of insulin for each patient was adjusted on the first 3 days. A total of 100 g Majia pomelo was consumed per meal in the last 3 tested days. Blood glucose was measured to evaluate the glycemic excursions. The GIs for Majia pomelo in healthy individuals and T2D patients were 78.34±1.88 and 72.15±1.95 respectively. The value of GL was as low as 4.23 in diabetic patients with serving size of 100 g pomelo, indicting Majia pomelo as a high GI but low GL fruit. Consumption of Majia pomelo in hospitalized T2D patients did not cause significant glucose fluctuation. It was concluded that high GI pomelo can serve as a low GL fruit if it is consumed with a limited daily amount and thus can be supplied to diabetic patients. These results may mean more varieties of food choices for T2D patients.展开更多
SSR molecular markers were used to analyze the genetic diversity of 8 Jinsha pomelo germplasm and its closely-related varieties from main planting area in Jiangxi Province. A total of 92 alleles were detected from 26 ...SSR molecular markers were used to analyze the genetic diversity of 8 Jinsha pomelo germplasm and its closely-related varieties from main planting area in Jiangxi Province. A total of 92 alleles were detected from 26 pairs of selected primers with 53. 68% of polymorphism. The alleles detected per locus were ranged from 2 to 8. On average,3. 54 alleles were amplified from per pair of primers. The similarity coefficients of the 8 varieties were in the range of 0. 729-0. 924.According to the genetic similarities based on UPGMA method,all materials were divided into two groups of Jinlan pomelo and Shatian pomelo at the similarity coefficient of 0. 738.展开更多
In this study,biochar(BC)derived from pomelo was prepared via a high-temperature calcination method to modify the graphitic carbon nitride(g-C_(3)N_(4))to synthesize the BC/g-C_(3)N_(4)composite for the degradation of...In this study,biochar(BC)derived from pomelo was prepared via a high-temperature calcination method to modify the graphitic carbon nitride(g-C_(3)N_(4))to synthesize the BC/g-C_(3)N_(4)composite for the degradation of the tetracycline(TC)antibiotic under visible light irradiation.The experimental results exhibit that the optimal feeding weight ratio of biochar/urea is 0.03:1 in BC/g-C_(3)N_(4)composite could show the best photocatalytic activity with the degradation rate of tetracycline is 83%in 100 min irradiation.The improvement of photocatalytic activity is mainly attributed to the following two points:(i)the strong bonding with π-π stacking between BC and g-C_(3)N_(4)make the photogenerated electrons of light-excited g-C_(3)N_(4)transfer to BC,quickly and improve the separation efficiency of carriers;(ii)the introduction of BC reduces the distance for photogenerated electrons to migrate to the surface and increases the specific surface area for providing more active sites.This study provides a sustainable,economical and promising method for the synthesis of photocatalytic materials their application to wastewater treatment.展开更多
Pomelo industry is one of the mainstay industries with most unique regional characteristics in Meizhou City,South China. This paper analyzed the status,development advantages and problems of pomelo industry and discus...Pomelo industry is one of the mainstay industries with most unique regional characteristics in Meizhou City,South China. This paper analyzed the status,development advantages and problems of pomelo industry and discussed on brand-based industry transformation and updating in order to provide references for expanding and strengthening pomelo industry. Meizhou City is the second largest prefecture-level city of pomelo production in China,where the cultivating area is up to 40 000 ha and the yield is over 900 000 t. With the expansion of industry scale,there were bottlenecks of pomelo industry in Meizhou City including industrial restructuring and upgrading. The paper analyzed the development status and existing problems of pomelo industry based on investigation and survey. Some corresponding strategies were also proposed for pomelo industry in Meizhou City.展开更多
[Objectives]In order to effectively alleviate Huanglongbing of Shatian pomelo trees,a nutrient preparation was developed and its effect on the growth and yield of Shatian pomelo was explored.[Methods]A field experimen...[Objectives]In order to effectively alleviate Huanglongbing of Shatian pomelo trees,a nutrient preparation was developed and its effect on the growth and yield of Shatian pomelo was explored.[Methods]A field experiment was carried out with four treatments:control group,nutrient solution group,agent group,and nutrient solution+agent group,and the liquids were infused into the fruit trees through the trunk using a hanging bag.[Results]Through field trials,it was found that the nutrient solution treatment of fruit trees significantly increased the leaf chlorophyll content and nitrogen content,which increased by 17%and 12%compared with the control group,respectively,reaching(70.80±1.57)and(5.53±0.1)mg/kg,respectively;and the combined application of the nutrient solution and powder agents greatly alleviated the symptoms of Huanglongbing in Shatian pomelo plants,and significantly improved the bacterial disease index,photosynthetic intensity and yield,which increased by 152%,158%and 213.53%respectively,reaching(371.00±7.22),(406.67±7.09)and 23.15 kg/hm^2.[Conclusions]The use of the nutrient solution and agents greatly alleviated the symptoms of Huanglongbing of Shatian pomelo plants,and significantly improved the chlorophyll content,nitrogen content,bacterial disease index and photosynthetic intensity.Meanwhile,the number of fruit per plant and the weight of single fruit were better than other treatment groups and the control group,the technical operation was simple and the effect was obvious.This provides a certain reference basis for the prevention and control measures of Huanglongbing in Shatian pomelo plants.展开更多
[Objective]This study aimed to investigate the optimal medium and hormone combinations for efficient rapid propagation of Gongshui pomelo and analyze key technical measures in the tissue culture process.[Method]Stem t...[Objective]This study aimed to investigate the optimal medium and hormone combinations for efficient rapid propagation of Gongshui pomelo and analyze key technical measures in the tissue culture process.[Method]Stem tips and stem segments with buds were collected from four varieties of pomelo adult trees as explants,to investigate the main effect and key regulatory factors of vegetative organs and tissue culture explants and to propose a series of measures to prevent and control microbial contamination.Finally,an efficient rapid propagation technology system of Gongshui pomelo was established.[Result]Spring shoot explants contained large amounts of auxin,cytokinins,gibberellins and other growth regulators,which could be used for tissue culture with high bud generation rate and rapid growth.Different conditions led to various culture results.Specifically,mature pomelo seeds should be generated on semi-solid 1/2MS medium and transferred to solid MS medium for incubation.The propagation coefficient of stem segments with axillary buds was greater than that of stem tips,exhibiting significant differences.In addition,the optimal hormone combination was 6-BA 0.5 mg/L+NAA 0.5 mg/L,which significantly promoted the induction and differentiation of adventitious buds.[Conclusion]This study provided basis for basic research,production and application of pomelo germplasm resources.展开更多
The key to solve increasingly severe electromagnetic(EM)pollution is to explore sustainable,easily prepared,and cost-effective EM wave absorption materials with exceptional absorption capability.Herein,instead of anch...The key to solve increasingly severe electromagnetic(EM)pollution is to explore sustainable,easily prepared,and cost-effective EM wave absorption materials with exceptional absorption capability.Herein,instead of anchoring on carbon materials in single layer,MoS_(2) flower-like microspheres were stacked on the surface of pomelo peels-derived porous carbon nanosheets(C)to fabricate MoS_(2)@C nanocomposites by a facile solvothermal process.EM wave absorption performances of MoS_(2)@C nanocomposites in X-band were systematically investigated,indicating the minimum reflection loss(RLmin)of-62.3 dB(thickness of 2.88 mm)and effective absorption bandwidth(EAB)almost covering the whole X-band(thickness of 2.63 mm)with the filler loading of only 20 wt.%.Superior EM wave absorption performances of MoS_(2)@C nanocomposites could be attributed to the excellent impedance matching characteristic and dielectric loss capacity(conduction loss and polarization loss).This study revealed that the as-prepared MoS_(2)@C nanocomposites would be a novel prospective candidate for the sustainable EM absorbents with superior EM wave absorption performances.展开更多
The aim of this study was in-line,rapid,and non-destructive detection for soluble solid content(SSC)in pomelos using visible and near-infrared spectroscopy(Vis-NIRS).However,the large size and thick rind of pomelo aff...The aim of this study was in-line,rapid,and non-destructive detection for soluble solid content(SSC)in pomelos using visible and near-infrared spectroscopy(Vis-NIRS).However,the large size and thick rind of pomelo affect the stability of spectral acquisition and the biological variabilities affect the robustness of models.Given these issues,in this study,an efficient prototype in-line detection system in transmittance mode was designed and evaluated in comparison with an off-line detection system.Data from the years 2019 and 2020 were used for modeling and the external validation data were obtained by the inline detection system in 2021.The wavelength selection methods of changeable size moving window(CSMW),random frog(RF),and competitive adaptive reweighted sampling(CARS)were used to improve the prediction accuracy of partial least squares regression(PLSR)models.The best performance of internal prediction was obtained by CARS-PLSR and the determination coefficient of prediction(),root mean square error of prediction(RMSEP),and residual predictive deviation(RPD)were 0.958,0.204%,and 4.821,respectively.However,all models obtained large prediction biases in external validation.The latent variable updating(LVU)method was proposed to update models and improve the performance in external validation.Ten samples from the external validation set were randomly selected to update the models.Compared with the recalibration method,LVU could effectively modify the original models which matched the SSC range of the external validation set.The CSMW-PLSR models were more robust in external validations.The off-line model with LVU performed best with a root mean square error of validation(RMSEV)of 0.599%and the in-line model with recalibration obtained RMSEV of 0.864%.These results demonstrated the application potential of the transmittance Vis-NIRS for in-line rapid prediction of SSC in pomelos and the modeling and updating methods could be applied to samples with biological variabilities.展开更多
文摘Pomelo peel is a by-product from pomelo consumption, but it is also rich in a variety of nutrients and functional substances. In order to solve the environmental problems caused by the large amount of discarded pomelo peels every year, in this study, we recycled pomelo peels to make pomelo yellow peel jelly (PYPJ) and pomelo white peel jelly (PWPJ) according to their different characteristics in pomelo peels. And the consumer sensory evaluation (n = 50) was carried out to explore the consumers’ evaluation and acceptance for these two innovative products. The results showed that both jellies received high mean scores for all sensory attributes expect PYPJ’ taste, and the consumer acceptances of PYPJ and PWPJ were 62% and 92%, respectively. These results displayed that there is a need to further improve PYPJ, and PWPJ is a product recognized by consumers. .
基金supported by the National Key Research and Development Program of China(Grant No.2018YFD1100504)the Natural Science Foundation of Hunan Province,China(Grant No.2017JJ2277).
文摘This study investigated the removal of hexavalent chromium(Cr(VI)) in aqueous solutions using pomelo peel(PP) and FeCl3-modified pomelo peel(FPP) as novel biomass adsorbents.Batch adsorption experiments were performed to evaluate the effects of pH,time,temperature,initial concentration,and adsorbent dose on Cr(VI) removal by PP and FPP.The results show that the maximum adsorption capacity of Cr(VI)was 21.55 mg/g for FPP and 0.57 mg/g for PP at a pH of 2.0 and a temperature of 40℃.The surface shape,microstructure,and chemical composition of FPP were analyzed with scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),and energy dispersive spectroscopy(EDS),and compared with those of PP.The results show that the adsorption performance of FPP was much better than that of PP,indicating that FPP can be an alternative high-efficiency adsorbent for Cr(VI) removal.
基金supported by the National Key R&DProgram of China(2018YFB1105100)National Natural Science Foundation of China(51973165).
文摘The porous structure in pomelo peel is believed to be responsible for the protection of its fruit from damage during the free falling from a tree.The quantitative understanding of the relationship between the deformation behavior and the porous structure could pave the way for the design of porous structures for efficient energy absorption.Here,a universal feature of pore distribution in pomelo peels along the radial direction is extracted from three varieties of pomelos,which shows strong correlation to the deformation behavior of the peels under compression.Guided by the porous design found in pomelo peels,porous polyether-ether-ketone(PEEK)cube is additively manufactured and possesses the highest ability to absorb energy during compression as compared to the non-pomelo-inspired geometries,which is further confirmed by the finite element simulation.The nature-optimized porous structure revealed here could guide the design of lightweight and high-energy-dissipating materials/devices.
基金supported by grants from National Natural Science Foundation of China(No.81570740 and No.81100581)the Ministry of Science and Technology of China(No.2011CB100600)+3 种基金the Science and Technology Projects of Wuhan(No.201060938360-04 from the Wuhan Science and Technology Bureau)China International Medical Foundation(CIMF)--Novo Nordisk China Diabetes Yingcai Funding(No.2014)CIMF-Novo Nordisk China β Academy Funding(No.20110059)the Fundamental Research Funds for the Central Universities(No.0118540208)
文摘Food intake has a great influence on blood glucose in patients with diabetes. This study was to determine the glycemic index(GI) and glycemic load(GL) of a particular pomelo named Majia pomelo and its effects on postprandial glucose(PPG) in patients with type 2 diabetes(T2D). Twenty healthy subjects and 20 T2D patients(controlled on lifestyle measures and/or metformin) were tested on 2 separate days with 50 g of glucose and 50 g equivalent of carbohydrates from Majia pomelo for GI measurement. To test effects of Majia pomelo on PPG, 19 hospitalized T2D patients(controlled on insulin therapy) were selected for a 9-day study. The dose of insulin for each patient was adjusted on the first 3 days. A total of 100 g Majia pomelo was consumed per meal in the last 3 tested days. Blood glucose was measured to evaluate the glycemic excursions. The GIs for Majia pomelo in healthy individuals and T2D patients were 78.34±1.88 and 72.15±1.95 respectively. The value of GL was as low as 4.23 in diabetic patients with serving size of 100 g pomelo, indicting Majia pomelo as a high GI but low GL fruit. Consumption of Majia pomelo in hospitalized T2D patients did not cause significant glucose fluctuation. It was concluded that high GI pomelo can serve as a low GL fruit if it is consumed with a limited daily amount and thus can be supplied to diabetic patients. These results may mean more varieties of food choices for T2D patients.
基金Supported by Natural Science Foundation of China(31501718,31460508)Scientific Research of Doctor Start-up Fund Project of Jiangxi Academy of Agricultural Sciences(20142CBS008)+3 种基金Jiangxi Province Foreign Science and Technology Cooperation Project(20141BDH80005)National International Scientific and Technological Cooperation Program(2015DFA31060)Innovation Fund of Jiangxi Academy of Agricultural sciences(2013CJJ009,2016CJJ002)Guangxi Innovation Team Nanning Test Station Project of Citrus Industry National Modern Agriculture Technology System(nycytxgxcxtd-05-08)
文摘SSR molecular markers were used to analyze the genetic diversity of 8 Jinsha pomelo germplasm and its closely-related varieties from main planting area in Jiangxi Province. A total of 92 alleles were detected from 26 pairs of selected primers with 53. 68% of polymorphism. The alleles detected per locus were ranged from 2 to 8. On average,3. 54 alleles were amplified from per pair of primers. The similarity coefficients of the 8 varieties were in the range of 0. 729-0. 924.According to the genetic similarities based on UPGMA method,all materials were divided into two groups of Jinlan pomelo and Shatian pomelo at the similarity coefficient of 0. 738.
基金the founding support from the National Natural Science Foundation of China (21906072, 22006057 and 31971616)the Natural Science Foundation of Jiangsu Province (BK20190982)+4 种基金“Doctor of Mass Entrepreneurship and Innovation” Project in Jiangsu ProvinceHenan Postdoctoral Foundation (202003013)the Science and Technology Research Project of the Department of Education of Jilin Province (JJKH20200039KJ)the Science and Technology Research Project of Jilin City (20190104120, 201830811)the Project of Jilin Provincial Science and Technology Development Plan (20190201277JC, 20200301046RQ, YDZJ202101ZYTS070)
文摘In this study,biochar(BC)derived from pomelo was prepared via a high-temperature calcination method to modify the graphitic carbon nitride(g-C_(3)N_(4))to synthesize the BC/g-C_(3)N_(4)composite for the degradation of the tetracycline(TC)antibiotic under visible light irradiation.The experimental results exhibit that the optimal feeding weight ratio of biochar/urea is 0.03:1 in BC/g-C_(3)N_(4)composite could show the best photocatalytic activity with the degradation rate of tetracycline is 83%in 100 min irradiation.The improvement of photocatalytic activity is mainly attributed to the following two points:(i)the strong bonding with π-π stacking between BC and g-C_(3)N_(4)make the photogenerated electrons of light-excited g-C_(3)N_(4)transfer to BC,quickly and improve the separation efficiency of carriers;(ii)the introduction of BC reduces the distance for photogenerated electrons to migrate to the surface and increases the specific surface area for providing more active sites.This study provides a sustainable,economical and promising method for the synthesis of photocatalytic materials their application to wastewater treatment.
基金Supported by Fourth National General Survey of Traditional Chinese Medicine Resources(2017)Key Science and Technology Innovation Project of Guangdong University(cxzd1132)Special Funds for Talent Introduction of Higher Institutions in Guangdong Province(2050205)
文摘Pomelo industry is one of the mainstay industries with most unique regional characteristics in Meizhou City,South China. This paper analyzed the status,development advantages and problems of pomelo industry and discussed on brand-based industry transformation and updating in order to provide references for expanding and strengthening pomelo industry. Meizhou City is the second largest prefecture-level city of pomelo production in China,where the cultivating area is up to 40 000 ha and the yield is over 900 000 t. With the expansion of industry scale,there were bottlenecks of pomelo industry in Meizhou City including industrial restructuring and upgrading. The paper analyzed the development status and existing problems of pomelo industry based on investigation and survey. Some corresponding strategies were also proposed for pomelo industry in Meizhou City.
基金Shaoguan Science and Technology Project(2018sn046)Schoollevel Project of Shaoguan University(SY2016KJ04)Undergraduate Innovation Project of Shaoguan University(202010576002X)。
文摘[Objectives]In order to effectively alleviate Huanglongbing of Shatian pomelo trees,a nutrient preparation was developed and its effect on the growth and yield of Shatian pomelo was explored.[Methods]A field experiment was carried out with four treatments:control group,nutrient solution group,agent group,and nutrient solution+agent group,and the liquids were infused into the fruit trees through the trunk using a hanging bag.[Results]Through field trials,it was found that the nutrient solution treatment of fruit trees significantly increased the leaf chlorophyll content and nitrogen content,which increased by 17%and 12%compared with the control group,respectively,reaching(70.80±1.57)and(5.53±0.1)mg/kg,respectively;and the combined application of the nutrient solution and powder agents greatly alleviated the symptoms of Huanglongbing in Shatian pomelo plants,and significantly improved the bacterial disease index,photosynthetic intensity and yield,which increased by 152%,158%and 213.53%respectively,reaching(371.00±7.22),(406.67±7.09)and 23.15 kg/hm^2.[Conclusions]The use of the nutrient solution and agents greatly alleviated the symptoms of Huanglongbing of Shatian pomelo plants,and significantly improved the chlorophyll content,nitrogen content,bacterial disease index and photosynthetic intensity.Meanwhile,the number of fruit per plant and the weight of single fruit were better than other treatment groups and the control group,the technical operation was simple and the effect was obvious.This provides a certain reference basis for the prevention and control measures of Huanglongbing in Shatian pomelo plants.
基金Supported by Project of Hubei Provincial Department of Education(Q20122902)Undergraduate Innovation Project of College of Forestry and Horticulture,Hubei Institute for Nationalities(LXDC1301)Key Science and Technology Program of Enshi Prefecture(2011)
文摘[Objective]This study aimed to investigate the optimal medium and hormone combinations for efficient rapid propagation of Gongshui pomelo and analyze key technical measures in the tissue culture process.[Method]Stem tips and stem segments with buds were collected from four varieties of pomelo adult trees as explants,to investigate the main effect and key regulatory factors of vegetative organs and tissue culture explants and to propose a series of measures to prevent and control microbial contamination.Finally,an efficient rapid propagation technology system of Gongshui pomelo was established.[Result]Spring shoot explants contained large amounts of auxin,cytokinins,gibberellins and other growth regulators,which could be used for tissue culture with high bud generation rate and rapid growth.Different conditions led to various culture results.Specifically,mature pomelo seeds should be generated on semi-solid 1/2MS medium and transferred to solid MS medium for incubation.The propagation coefficient of stem segments with axillary buds was greater than that of stem tips,exhibiting significant differences.In addition,the optimal hormone combination was 6-BA 0.5 mg/L+NAA 0.5 mg/L,which significantly promoted the induction and differentiation of adventitious buds.[Conclusion]This study provided basis for basic research,production and application of pomelo germplasm resources.
基金supported by the PhD Start-up Fund of Science and Technology Department of Liaoning Province(No.2022-BS-306)the General Cultivation Scientific Research Project of Bohai University(No.0522xn058)the PhD Research Startup Foundation of Bohai University(No.0521bs021).
文摘The key to solve increasingly severe electromagnetic(EM)pollution is to explore sustainable,easily prepared,and cost-effective EM wave absorption materials with exceptional absorption capability.Herein,instead of anchoring on carbon materials in single layer,MoS_(2) flower-like microspheres were stacked on the surface of pomelo peels-derived porous carbon nanosheets(C)to fabricate MoS_(2)@C nanocomposites by a facile solvothermal process.EM wave absorption performances of MoS_(2)@C nanocomposites in X-band were systematically investigated,indicating the minimum reflection loss(RLmin)of-62.3 dB(thickness of 2.88 mm)and effective absorption bandwidth(EAB)almost covering the whole X-band(thickness of 2.63 mm)with the filler loading of only 20 wt.%.Superior EM wave absorption performances of MoS_(2)@C nanocomposites could be attributed to the excellent impedance matching characteristic and dielectric loss capacity(conduction loss and polarization loss).This study revealed that the as-prepared MoS_(2)@C nanocomposites would be a novel prospective candidate for the sustainable EM absorbents with superior EM wave absorption performances.
基金the key research and development projects of Zhejiang province(Grant No.2022C02021).
文摘The aim of this study was in-line,rapid,and non-destructive detection for soluble solid content(SSC)in pomelos using visible and near-infrared spectroscopy(Vis-NIRS).However,the large size and thick rind of pomelo affect the stability of spectral acquisition and the biological variabilities affect the robustness of models.Given these issues,in this study,an efficient prototype in-line detection system in transmittance mode was designed and evaluated in comparison with an off-line detection system.Data from the years 2019 and 2020 were used for modeling and the external validation data were obtained by the inline detection system in 2021.The wavelength selection methods of changeable size moving window(CSMW),random frog(RF),and competitive adaptive reweighted sampling(CARS)were used to improve the prediction accuracy of partial least squares regression(PLSR)models.The best performance of internal prediction was obtained by CARS-PLSR and the determination coefficient of prediction(),root mean square error of prediction(RMSEP),and residual predictive deviation(RPD)were 0.958,0.204%,and 4.821,respectively.However,all models obtained large prediction biases in external validation.The latent variable updating(LVU)method was proposed to update models and improve the performance in external validation.Ten samples from the external validation set were randomly selected to update the models.Compared with the recalibration method,LVU could effectively modify the original models which matched the SSC range of the external validation set.The CSMW-PLSR models were more robust in external validations.The off-line model with LVU performed best with a root mean square error of validation(RMSEV)of 0.599%and the in-line model with recalibration obtained RMSEV of 0.864%.These results demonstrated the application potential of the transmittance Vis-NIRS for in-line rapid prediction of SSC in pomelos and the modeling and updating methods could be applied to samples with biological variabilities.
