期刊文献+
共找到12篇文章
< 1 >
每页显示 20 50 100
Application of Chemical Tracing Experiment Technique in Leakage Detection of Hydraulic Engineering
1
作者 李亚军 《Agricultural Science & Technology》 CAS 2011年第9期1385-1387,共3页
[Objective] The research aimed to study the application of chemical tracing experiment technique in leakage detection of hydraulic engineering.[Method] According to the current situation of Sanyuan Western Suburb Rese... [Objective] The research aimed to study the application of chemical tracing experiment technique in leakage detection of hydraulic engineering.[Method] According to the current situation of Sanyuan Western Suburb Reservoir in Xianyang City of Shaanxi Province,three sections (L1,L2 and L3) were set.KI was selected as the chemical tracer to carry out the tracing and detection research.[Result] There was no obvious leakage phenomenon in L1,L2 and L3 sections.The impermeability of rock in some dam abutments was bad.[Conclusion] The leakage reason of Western Suburb Reservoir was that the impermeability of rock in some dam abutments couldn’t satisfy seepage requirement.After the reservoir was put into operation,the water level in front of dam rose,and the ground water level of dam abutment also rose.The penetration water pressure correspondingly increased,and the water content of bank slope at the downstream of dam increased. 展开更多
关键词 Chemical tracing experiment technique TRACER tracing technique LEAKAGE Hydraulic engineering
下载PDF
The Double Projecting Neuron of the Cat Spinal Dorsal Horn——A Study with Double Retrograde Fluorescent Tracing Technique
2
作者 Jiao Shoushu Liu Yujun +2 位作者 Wang Yuanshen Zhang Guofeng Lu Guowei 《解剖学报》 CAS 1985年第3期243-243,共1页
The new double projecting neurons were found in the cat spinal dorsal horn by the double retrograde fluorescent tracing technique.Fast Blue(FB)was injected into unilateral dorsal column nucleus(DCN)of adult cats anest... The new double projecting neurons were found in the cat spinal dorsal horn by the double retrograde fluorescent tracing technique.Fast Blue(FB)was injected into unilateral dorsal column nucleus(DCN)of adult cats anesthetized with pentobarbital.Nuclear Yellow(NY)was injected ipsilaterally into the lateral cervical nucleus(LCN)8-9 days later.After an additional 18-30 hrs. 展开更多
关键词 A Study with Double Retrograde Fluorescent tracing technique The Double Projecting Neuron of the Cat Spinal Dorsal Horn
原文传递
Combined Adaptive Multiple Subtraction Based on Optimized Event Tracing and Extended Wiener Filtering 被引量:3
3
作者 TAN Jun SONG Peng +3 位作者 LI Jinshan WANG Lei ZHONG Mengxuan ZHANG Xiaobo 《Journal of Ocean University of China》 SCIE CAS CSCD 2017年第3期411-421,共11页
The surface-related multiple elimination(SRME) method is based on feedback formulation and has become one of the most preferred multiple suppression methods used. However, some differences are apparent between the pre... The surface-related multiple elimination(SRME) method is based on feedback formulation and has become one of the most preferred multiple suppression methods used. However, some differences are apparent between the predicted multiples and those in the source seismic records, which may result in conventional adaptive multiple subtraction methods being barely able to effectively suppress multiples in actual production. This paper introduces a combined adaptive multiple attenuation method based on the optimized event tracing technique and extended Wiener filtering. The method firstly uses multiple records predicted by SRME to generate a multiple velocity spectrum, then separates the original record to an approximate primary record and an approximate multiple record by applying the optimized event tracing method and short-time window FK filtering method. After applying the extended Wiener filtering method, residual multiples in the approximate primary record can then be eliminated and the damaged primary can be restored from the approximate multiple record. This method combines the advantages of multiple elimination based on the optimized event tracing method and the extended Wiener filtering technique. It is an ideal method for suppressing typical hyperbolic and other types of multiples, with the advantage of minimizing damage of the primary. Synthetic and field data tests show that this method produces better multiple elimination results than the traditional multi-channel Wiener filter method and is more suitable for multiple elimination in complicated geological areas. 展开更多
关键词 multiple adaptive attenuation surface-related multiple prediction Wiener filtering short-time window FK filtering event tracing technique
下载PDF
Fluoro-ruby retrograde tracing and three-dimensional visualization of the corticospinal tract in the guinea pig
4
作者 Xiao Han Lulian Xu +7 位作者 Yue Wu Hua Xun Jinxiu Pan Yingying Huang Dafeng Ji Huiqun Wu Guangming Lv Lemin Tang 《Neural Regeneration Research》 SCIE CAS CSCD 2012年第5期363-367,共5页
Fluoro-ruby was injected into the posterior funiculus of the spinal cord in the cervical (C5-T2) and lumbar (L3-6) segments of adult guinea pigs. The spinal cord was cut into serial frozen sections. The Fluoro-rub... Fluoro-ruby was injected into the posterior funiculus of the spinal cord in the cervical (C5-T2) and lumbar (L3-6) segments of adult guinea pigs. The spinal cord was cut into serial frozen sections. The Fluoro-ruby labeling was clearly delineated from the surrounding structure. The labeling traversed the cervical, thoracic and lumbar segments, and was located on the ventral portion of the posterior funiculus on the injected side, proximal to the intermediate zone of the dorsal gray matter. The fluorescence area narrowed rostro-caudally. The spinal cord, spinal cord gray matter and corticospinal tract were reconstructed using 3D-DOCTOR 4.0 software, resulting in a robust three-dimensional profile. Using functionality provided by the reconstruction software, free multi-angle observation and sectioning could be conducted on the spinal cord and corticospinal tract. Our experimental findings indicate that the Fluoro-ruby retrograde fluorescent tracing technique can accurately display the anatomical location of corticospinal tract in the guinea pig and that three-dimensional reconstruction software can be used to provide a three-dimensional image of the corticospinal tract. 展开更多
关键词 corticospinal tract Fluoro-ruby retrograde fluorescent tracing technique three-dimensional reconstruction guinea pig
下载PDF
Modeling, Simulation and Experimental Studies of Refractometric Fiber Optic Sensor
5
作者 Supriya S. Patil Arvind D. Shaligram 《Journal of Sensor Technology》 CAS 2023年第1期1-11,共11页
Refractometric fiber optic sensors have a number of applications in industry due to advantages like remote sensing ability, compact size, easy to fit, etc. A refractometric sensor contains a pair of parallel fibers an... Refractometric fiber optic sensors have a number of applications in industry due to advantages like remote sensing ability, compact size, easy to fit, etc. A refractometric sensor contains a pair of parallel fibers and a gap between the sensor probe and reflector, wherein the liquid whose refractive index is to be measured is filled. This paper describes the importance of mathematical modeling of this sensor. Ray tracing approach is used to model the sensor mathematically. This mathematical model is generalized for any scenario which is useful to avoid tedious trial and error techniques to design the sensor prototype. Mathematical modelling is a useful tool to optimize the gap distance for a detection of refractive index of liquid. The model is developed and analyzed rigorously considering adulteration of diesel by kerosene where refractive index varies from 1.44 to 1.46. Simulation experiments are carried out to optimize the gap distance which is found to be 6.8 mm using both models. Experiments are carried out where sensor probe is fabricated and results are analyzed. It is observed that for suggested gap distance sensor output varies almost linear over the entire range. 展开更多
关键词 Refractometric Fiber Optic Sensor Mathematical Modeling Ray tracing technique
下载PDF
Nitrate and Ammonium Leaching in Variable-and Permanent-Charge Paddy Soils 被引量:11
6
作者 XIONG Zheng-Qin HUANG Tai-Qing +2 位作者 MA Yu-Chun XING Guang-Xi ZHU Zhao-Liang 《Pedosphere》 SCIE CAS CSCD 2010年第2期209-216,共8页
A variable-charge (VC) and a permanent-charge paddy soil (PC) were selected to study nitrate-N (NO3^--N) and ammonium-N (NH4^+-N) leaching with N isotopes for one consecutive year. An irrigation and intermitt... A variable-charge (VC) and a permanent-charge paddy soil (PC) were selected to study nitrate-N (NO3^--N) and ammonium-N (NH4^+-N) leaching with N isotopes for one consecutive year. An irrigation and intermittent drainage pattern was adopted to mimic natural occurrence of rainfall during the upland crop season and drainage management during the flooded rice season. Treatments to each soil type were no-N controls (CK), ^15N-labeled (NH4)2SO4 (NS), and milk vetch (NV) applied at a rate equivalent to 238 kg N ha^-1 to unplanted lysimeters, totaling six treatments in triplicates. Results indicated that the soil type dominated N leaching characteristics. In the case of PC, NO3^--N accounted for 78% of the total leached inorganic N; NS was prone to leach three times more than the NV, being 8.2% and 2.4% of added ^15N respectively; and 〉 85% of leached NO3-N came from of the total inorganic N in leachate. Moreover, NH4^+-N native N in the soil. In the case of VC, NH4^+-N made up to 92% leaching was detected throughout the whole incubation, and was particularly high during the flooded season. NO3^--N leaching in VC occurred later at a lower rate compared to that in PC. The findings of this study indicate that NO3^--N leaching during the drained season in permanent-charge paddy soils and NH4^+-N leaching in variable-charge soils deserve more attention for regional environmental control. 展开更多
关键词 drained/flooded rotations fertilizer-derived nitrate ion movement LYSIMETER ^15N tracing technique
下载PDF
Dynamic Properties of Fiber Reinforced Cement Mortar
7
作者 唐志平 徐松林 +2 位作者 胡晓军 廖香丽 蔡建 《Journal of Beijing Institute of Technology》 EI CAS 2004年第3期313-316,共4页
Based on the shear wave tracing(SWT) technique proposed by Tang Z P, particle velocity gauge and the dual internal measurement for pressure and shear waves (IMPS) system are applied to investigate the responses of fib... Based on the shear wave tracing(SWT) technique proposed by Tang Z P, particle velocity gauge and the dual internal measurement for pressure and shear waves (IMPS) system are applied to investigate the responses of fiber reinforced cement subjected to impact loading. Series of experiments are conducted. The results show that there exist four critical points, A, B, C, D, in p-V Hugoniot curves. They correspond to the Hugoniot elastic limit (HEL) of the material, the critical point for shear strength limit and transition from damage state to failure state, void collapse, and solid compression, respectively. The critical point B is difficult to be aware of and never reported. However, it can be clearly disclosed with SWT method. Based on the analyses of shear strength, it can be concluded that the transversal wave, especially the unloading transversal wave, is especially important for the dynamic damage investigation of brittle materials. 展开更多
关键词 impact mechanics fiber reinforced cement shear wave tracing technique void collapse
下载PDF
Quantitative characterization of fusion state of virgin and aged asphalt using nano-ferrous ferric oxide tracer
8
作者 Qiang Li Song Liu +1 位作者 Huameng Wen Zhou Zhou 《Journal of Traffic and Transportation Engineering(English Edition)》 EI CSCD 2024年第3期467-480,共14页
The exact evaluation of the fusion rate of virgin and aged asphalt is essential to optimize the performance of the recycled asphalt mixture.The fusion rate index was developed by tracing the distribution of tracer asp... The exact evaluation of the fusion rate of virgin and aged asphalt is essential to optimize the performance of the recycled asphalt mixture.The fusion rate index was developed by tracing the distribution of tracer asphalt,which contains nano-ferrous ferric oxide(nano-Fe_(3)O_(4))tracer.Laboratory fusion simulation tests were performed on three types of asphalt to obtain different fusion states,and fatigue tests were performed to evaluate the influence of the fusion rate on the fatigue life of the recycled asphalt.It was found that the tracer asphalt containing 4%nano-Fe_(3)O_(4)shows the optimal trace effect,and the developed fusion rate index can quantitatively characterize the influence of different factors on the fusion state of the recycled asphalt.The fusion state is closely related to the fatigue performance of recycled asphalt,and the fusion rate index can fairly evaluate its fatigue performance.The relationship between the fusion rate and the fatigue life of recycled asphalt depends on the factors that cause the fusion rate variation.Under the influence of the amount of rejuvenator,the fatigue life of recycled asphalt grows exponentially with increasing fusion rate due to enhancement of molecular motion as well as a supplement of lightweight components.Under the influence of heat preservation treatment,fatigue life increases linearly with increasing fusion rate.The proposed fusion rate index can be utilized to quantitatively characterize the fusion state of virgin and aged asphalt,thus providing a simple way to guide the practical application of recycled asphalt. 展开更多
关键词 Recycled asphalt Rejuvenator tracing technique Fusion rate FATIGUE
原文传递
Pseudomonas mendocina LYX:A novel aerobic bacterium with advantage of removing nitrate high effectively by assimilation and dissimilation simultaneously 被引量:5
9
作者 Yuxin Li Jiayin Ling +5 位作者 Pengcheng Chen Jinliang Chen Ruizhi Dai Jinsong Liao Jiejing Yu Yanbin Xu 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2021年第4期131-140,共10页
The problem of nitrate accumulation in aerobic tank and total nitrogen excessive discharge in effluent was very common in traditional livestock and poultry farming wastewater treatment systems owing to the lengthy pro... The problem of nitrate accumulation in aerobic tank and total nitrogen excessive discharge in effluent was very common in traditional livestock and poultry farming wastewater treatment systems owing to the lengthy process flow and low process control level.A strain LYX of aerobic bacterium was isolated from the activated sludge of a wastewater treatment system in a pig farm,which could remove nitrate effectively in aerobic tank and was identified Pseudomonas mendocina by 16S rRNA sequencing.Under the condition of nitrate as the sole nitrogen source,this strain removed over 90%of NO_(3)^(−)-N with an initial concentration of 110 mg/L under aerobic conditions within 48 hours.Among them,37.9%of NO_(3)^(−)-N was assimilated into Bio-N,about 51.9%was reduced to gaseous nitrogen and less than 0.5%of nitrogen was replaced by NO_(3)^(−)-N and NH_(4)^(+)-N,9.7%NO_(3)^(−)-N remained in the effluent at the end.At the same time,four key genes(napA,nirK,norB and nosZ)related to nitrate nitrogen removal were expressed during the denitrification process of P.mendocina LYX,in which the transcription level of the indicator genes of this aerobic denitrifying bacterium(napA)was the highest.In addition,it was found with the 15N tracer technique that inoculation of this strain on sludge increased the amount of nitrogen loss from 9.26 nmol N/(g·h)to 23.835 nmol N/(g·h).Therefore,P.medocina LYX is a potential bioagent for advanced nitrogen removal by assimilating and reducing nitrate simultaneously in aerobic tanks. 展开更多
关键词 Pseudomonas mendocina Aerobic nitrate removal ^(15)N tracing technique Denitrification assimilatively and disimilatively Aerobic denitrifying genes
原文传递
Effect of orchard age on soil nitrogen transformation in subtropical China and implications 被引量:4
10
作者 Yushu Zhang Jinbo Zhang +2 位作者 Tongbin Zhu Christoph Müller Zucong Cai 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2015年第8期10-19,共10页
A better understanding of nitrogen transformation in soils could reveal the capacity for biological inorganic N supply and improve the efficiency of N fertilizers. In this study, a15 N tracing study was carried out to... A better understanding of nitrogen transformation in soils could reveal the capacity for biological inorganic N supply and improve the efficiency of N fertilizers. In this study, a15 N tracing study was carried out to investigate the effects of converting woodland to orchard, and orchard age on the gross rates of N transformation occurring simultaneously in subtropical soils in Eastern China. The results showed that inorganic N supply rate was remained constant with soil organic C and N contents increased after converting woodland into citrus orchard and with increasing orchard age. This phenomenon was most probably due to the increase in the turnover time of recalcitrant organic-N, which increased with decreasing soil p H along with increasing orchard age significantly. The amo A gene copy numbers of both archaeal and bacterial were stimulated by orchard planting and increased with increasing orchard age. The nitrification capacity(defined as the ratio of gross rate of nitrification to total gross rate of mineralization) increased following the Michaelis–Menten equation, sharply in the first 10 years after woodland conversion to orchard, and increased continuously but much more slowly till 30 years. Due to the increase in nitrification capacity and unchanged NO3-consumption, the dominance of ammonium in inorganic N in woodland soil was shifted to nitrate dominance in orchard soils. These results indicated that the risk of NO3-loss was expected to increase and the amount of N needed from fertilizers for fruit growth did not change although soil organic N accumulated with orchard age. 展开更多
关键词 15N tracing technique Gross rates of nitrogen transformation Subtropical orchard soil
原文传递
Synchrotron micro-scale measurement of metal distributions in Phragmites australis and Typha latifolia root tissue from an urban brownfield site 被引量:3
11
作者 Huan Feng Yu Qian +5 位作者 Frank J.Gallagher Weiguo Zhang Lizhong Yu Changjun Liu Keith W.Jones Ryan Tappero 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2016年第3期172-182,共11页
Liberty State Park in New Jersey,USA,is a "brownfield" site containing various levels of contaminants.To investigate metal uptake and distributions in plants on the brownfield site,Phragmites australis and Typha lat... Liberty State Park in New Jersey,USA,is a "brownfield" site containing various levels of contaminants.To investigate metal uptake and distributions in plants on the brownfield site,Phragmites australis and Typha latifolia were collected in Liberty State Park during the growing season(May–September)in 2011 at two sites with the high and low metal loads,respectively.The objective of this study was to understand the metal(Fe,Mn,Cu,Pb and Zn)concentration and spatial distributions in P.australis and T.latifolia root systems with micro-meter scale resolution using synchrotron X-ray microfluorescence(μXRF)and synchrotron X-ray computed microtomography(μCMT)techniques.The root structure measurement by synchrotron μCMT showed that high X-ray attenuation substance appeared in the epidermis.Synchrotron μXRF measurement showed that metal concentrations and distributions in the root cross-section between epidermis and vascular tissue were statistically different.Significant correlations were found between metals(Cu,Mn,Pb and Zn)and Fe in the epidermis,implying that metals were scavenged by Fe oxides.The results from this study suggest that the expression of metal transport and accumulation within the root systems may be element specific.The information derived from this study can improve our current knowledge of the wetland plant ecological function in brownfield remediation. 展开更多
关键词 Phragmites australis Typha latifolia Trace metals Synchrotron radiation technique Brownfield
原文传递
Interaction between retanning agents and wet white tanned by a novel bimetal complex tanning agent 被引量:13
12
作者 Wanli Huang Ying Song +2 位作者 Yue Yu Ya-nan Wang Bi Shi 《Journal of Leather Science and Engineering》 2020年第1期77-85,共9页
A promising and practical chrome-free tanning system has been developed based on a novel Al–Zr bimetal complex tanning agent.However,to achieve satisfactory resultant leather,the retanning process that is compatible ... A promising and practical chrome-free tanning system has been developed based on a novel Al–Zr bimetal complex tanning agent.However,to achieve satisfactory resultant leather,the retanning process that is compatible with this emerging tannage needs to be investigated systematically.This paper aims to explore the interaction between the bimetal complex tanned wet white and retanning agents.The isoelectric point(pI)of wet white was 7.2,which was nearly the same as wet blue.The electropositivity of wet white was even higher than that of wet blue during post-tanning processes,resulting in higher uptake rate of retanning agents.The distribution of various retanning agents in wet white was analyzed by pI measurement of layered leather and fluorescent tracing technique.The retanning agents were unevenly distributed throughout the cross-section,which might be an important restriction factor in obtaining satisfactory organoleptic properties of the crust leather.This fact is mainly due to the strong electrostatic interaction between anionic retanning agents and wet white.Applying a high dosage of multiple retanning agents in a proper sequence of addition benefited the full penetration of retanning agents in leather matrix and thus improved the organoleptic properties of crust leather.This work provides guidance for optimizing retanning process of the wet white leather. 展开更多
关键词 Wet white RETANNING Chrome-free tanning Isoelectric point Fluorescent tracing technique
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部