检索结果-南通市图书馆

Novel sediment source fingerprinting quantifying erosion-induced total nitrogen and total phosphorus outputs from an intensive agricultural catchment,North China

引用

International Soil and Water Conservation Research 2023年第3期11卷 494-506页

作者： Hanqing Yu Joseph Adu-Gyamfi Suarau Odutola Oshunsanya Adrian Chappell Wenxiang Liu Yu Zheng Tingting Xue lee Heng Agricultural Clean Watershed Research Group Institute of Environment and Sustainable Development in AgricultureChinese Academy of Agricultural Sciences(CAAS)Haidian District100081BeijingChina International Atomic Energy Agency ViennaAustria Department of Agronomy University of IbadanNigeria School of Earth and Environmental Sciences Cardif UniversityCardifUK Chongqing Branch Institute Changjiang River Scientific Research InstituteChongqing400026China

Intensive farming is a primary cause of increased sediment and associated nitrogen(N)and phosphorus(P)loads in surface water *** their contributing sources,pathways and loads present major challenges in the high-intensity agricultural ***,we quantify the sediment sources and magnitude of sediment total N and total P from different sources using a novel application of compound-specific stable isotope(CSSI)and fallout radionuclides(FRNs)of^(137)cs and^(210)pbex in an intensive agricultural catchment in North *** sources from surface and sub-surface soils were estimated from FRNs fingerprint and accounted for 62±7%and 38±7%respectively,while surface soil from land uses that originated from hillslope were identified by CssI *** a novel application of FRNs and CSSI sediment fingerprinting techniques,the dominant sediment source was derived from maize farmland(44±0.1%),followed by channel bank(38±7%).The sedimentation rate(13.55±0.30 t ha^(-1)yr^(-1))was quantifed by the^(137)cs cores(0-60 cm)at the outlet of this *** total N and total P in sediment were both mostly derived from maize farmland and least from channel *** channel banks are significant sediment sources but contribute little to the input of sediment N and P for *** implies that chemically-applied farmlands are the main hotspots for catchment erosion control and pollution *** novel application of FRNs and CSSI techniques cost-effectively quantified sediment N and P loads from different sources with a single visit to the catchment,enabling rapid assessment for optimizing soil conservation strategies and land management practices.

关键词： Sediment sources Land use N and P loads Compound-specific stable isotope Falloutradionuclides

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Observing the reconnection region in a transequatorial loop system

引用

Research in Astronomy and Astrophysics 2011年第10期11卷 1209-1228页

作者： Rui Liu Tong-Jiang Wang Jeongwoo lee Guillermo Stenborg Chang Liu Sung-Hong Park Hai-Min Wang Space Weather Research Laboratory Center for Solar-Terrestrial Research NJIT Newark NJ 07102 USA Catholic University of America and NASA Goddard Space Flight Center Greenbelt MD 20771 USA Department of Physics NJIT Newark NJ 07102 USA Interferometrics Inc. Herndon VA 20171 USA Korea Astronomy and Space Science Institute Daejeon 305-348 Republic of Korea

A vertical current sheet is a crucial element in many flare/coronal mass ejection （CME） models. For the first time, Liu et al. reported a vertical current sheet directly imaged during the flare rising phase with the EUV Imaging Telescope （EIT） onboard the Solar and Heliospheric Observatory （SOHO）. As a follow-up study, here we present the comprehensive analysis and detailed physical interpretation of the observation. The current sheet formed due to the gradual rise of a transequatorial loop system. As the loop legs approached each other, plasma flew at - 6 km s^-1 into a local area where a cusp-shaped flare loop subsequently formed and the current sheet was seen as a bright, collimated structure of global length （_〉 0.25 RQ） and macroscopic width （（5-10）× 10^3 km）, extending from 50 Mm above the flaring loop to the border of the EIT field of view （FOV）. The reconnection rate in terms of the Alfven Mach number is estimated to be only 0.005-0.009, albeit a halo CME was accelerated from - 400 km s- 1 to - 1300 km s- 1 within the coronagraph FOV. Drifting pulsating structures at metric frequencies were recorded during the impulsive phase, implying tearing of the current sheet in the high corona. A radio Type III burst occurred when the current sheet was clearly seen in EUV, indicative of accelerated electrons beam- ing upward from the upper tip of the current sheet. A cusp-shaped dimming region was observed to be located above the post-flare arcade during the decay phase in EIT; both the arcade and the dimming expanded with time. With the Coronal Diagnostic Spectrometer （CDS） aboard SOHO, a clear signature of chromospheric evaporation was seen during the decay phase, i.e., the cusp-shaped dimming region was associ- ated with plasma upflows detected with EUV hot emission lines, while the post-flare loop was associated with downflows detected with cold lines. This event provides a comprehensive view of the reconnection geometry and dynamics in the solar corona.

关键词： Sun coronal mass ejections -- Sun flares -- Sun corona

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Effects of Limiters on High Resolution Computations of Hypersonic Flows over Bodies with Complex Shapes

引用

Communications in Nonlinear Science and Numerical Simulation 1998年第2期3卷 30-35页

作者： Bo ZHENG and Chun Hian lee (National Laboratory for Computational Fluid Dynamics, Beijing University of Aeronautics & Astronautics, Beijing 100083, China) National Laboratory for Computational Fluid Dynamics Beijing University of Aeronautics & Astronautics Beijing 100083 China

ＩｎｔｒｏｄｕｃｔｉｏｎＳｉｎｃｅｔｈｅｉｄｅａｏｆＴＶＤｗａｓｐｒｏｐｏｓｅｄｂｙＨａｒｔｅｎ［１］ｓｏｍｅｔｗｏｄｅｃａｄｅｓａｇｏ，ｖａｒｉｏｕｓｔｙｐｅｓｏｆｈｉｇｈｒｅｓｏｌｕｔｉｏｎｓｃｈｅｍｅｓｆｏｒｓ... 详细信息

ＩｎｔｒｏｄｕｃｔｉｏｎＳｉｎｃｅｔｈｅｉｄｅａｏｆＴＶＤｗａｓｐｒｏｐｏｓｅｄｂｙＨａｒｔｅｎ［１］ｓｏｍｅｔｗｏｄｅｃａｄｅｓａｇｏ，ｖａｒｉｏｕｓｔｙｐｅｓｏｆｈｉｇｈｒｅｓｏｌｕｔｉｏｎｓｃｈｅｍｅｓｆｏｒｓｉｍｕｌａｔｉｎｇｔｈｅｃｏｍｐｒ...

关键词： TVD scheme hypersonic flows entropy correction function limiter

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Evaluating the Discriminatory Power of DNA Barcodes in Panicoideae, Poaceae

引用

Journal of Agricultural Science and Technology(B) 2014年第7期4卷 533-544页

作者： Jeongran lee Chang-Seok Kim In-Yong lee Department of Crop Life Safety National Academy of Agricultural Science Rural Development Administration Suwon 441- 701Republic of Korea

DNA barcoding is a powerful technique for species identification with little morphological knowledge, by using short sections of DNA from a specific region of the genome. Two core barcode markers, rbcL and matK, and a supplementary nuclear ribosomal internal transcribed spacer region were used to examine the effectiveness of the markers for Poaceae barcoding using 133 individuals of 36 taxa across 23 genera of Korean Panicoideae. We also aimed to establish a DNA barcode database for the major weeds of Korean Panicoideae. All three markers revealed a good level of amplification and sequencing success. As a single DNA marker, the ITS region achieved the highest species resolution, followed by matK. Resolving power was increased when nrlTS was incorporated into the core barcode markers. The best resolving power was obtained with a combination of matK ＋ ITS with 89.7%, followed by rbcL ＋ matK ＋ ITS with 89.3%. Thus, rbcL may be not necessary as a DNA barcode for Panicoideae species identification, when considering cost and effectiveness. Instead, a combination of matK ＋ ITS is proposed as the most suitable DNA barcode for the species identification of Panicoideae, Poaceae. We conclude that DNA barcoding using a combination of matK ＋ ITS could be one of powerful techniques for the identification of Poaceae species, The barcode sequences were deposited to the National Center for Biotechnology Information （NCBI） database for public use.

关键词： Plant barcode Poaceae core barcode markers nrITS resolving power.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

M3SC:A Generic Dataset for Mixed Multi-Modal(MMM)Sensing and Communication Integration

引用

China Communications 2023年第11期20卷 13-29页

作者： Xiang Cheng Ziwei Huang Lu Bai Haotian Zhang Mingran Sun Boxun Liu Sijiang Li Jianan Zhang Minson lee State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China Joint SDU-NTU Centre for Artificial Intelligence Research(C-FAIR) Shandong UniversityJinan 250100China Ever-Florescence Technology Nanjing 210000China

The sixth generation(6G)of mobile communication system is witnessing a new paradigm shift,i.e.,integrated sensing-communication system.A comprehensive dataset is a prerequisite for 6G integrated sensing-communication *** paper develops a novel simulation dataset,named M3SC,for mixed multi-modal(MMM)sensing-communication integration,and the generation framework of the M3SC dataset is further *** obtain multimodal sensory data in physical space and communication data in electromagnetic space,we utilize Air-Sim and WaveFarer to collect multi-modal sensory data and exploit Wireless InSite to collect communication ***,the in-depth integration and precise alignment of AirSim,WaveFarer,andWireless InSite are *** M3SC dataset covers various weather conditions,multiplex frequency bands,and different times of the ***,the M3SC dataset contains 1500 snapshots,including 80 RGB images,160 depth maps,80 LiDAR point clouds,256 sets of mmWave waveforms with 8 radar point clouds,and 72 channel impulse response(CIR)matrices per snapshot,thus totaling 120,000 RGB images,240,000 depth maps,120,000 LiDAR point clouds,384,000 sets of mmWave waveforms with 12,000 radar point clouds,and 108,000 CIR *** data processing result presents the multi-modal sensory information and communication channel statistical ***,the MMM sensing-communication application,which can be supported by the M3SC dataset,is discussed.

关键词： multi-modal sensing ray-tracing sensing-communication integration simulation dataset

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cost-Effective Approaches of Circumferential Electro Wedge Brake for Reducing Unbalance-Wears

引用

Journal of Mechanics Engineering and Automation 2012年第4期2卷 208-212页

作者： Dong-Hwan Shin Oh-Seok Kwon Jeon-il Moon Seung-Han Yang Division of Robot System Daegu Gyeongbuk Institute of Science and Technology Daegu 711-873 South Korea Department of Mechanical Engineering Kyungpook National University Daegu 702-701 South Korea

Existing hydraulic braking systems in the vehicle is composed of the brake pedal, the hydraulic booster and the hydraulic caliper. The driver transmits one＇s breaking intent through the brake pedal stroke and force. The hydraulic booster can amplify the pedal force, only when the engine operates. The hydraulic caliper is composed of cylinders, pistons. There are also hydraulic pipes from the booster to the caliper. Currently, X-By-Wire technology is researched actively due to the exhaustion of fuel and the regulation of CO2. As a chain of this trend, the e-pedal and an electric mechanical brake （EMB） also are highlighted. At the beginning of EMB development, high-torque and high-power motors are required in order to implement the existing hydraulic calipers＇ clamping force. This has some limits as the need of big spaces and high costs. Then the electro wedge brake （EWB） is launching with self-reinforcement features of the wedge structure. EWB can generate big clamping forces with small size and low-torque motors with good braking-efficiency. In recent, the disc＇s circumferential face clamping one has been researched, for better heat-emission ability and better braking-efficiency compared to the existing disc＇s lateral face clamping method. But, this circumferential face clamping method can have worse unbalance-wear features compared to lateral face clamping one. In this study, the authors describe their circumferential EWB concepts, the method for reducing unbalance-wear feature of circumferential EWB, and the cost-effective implementation of circumferential EWB, in particular focused on nonlinear counter-wedge profile which is appropriate to reduce unbalance-wear.

关键词： Electro wedge brake circumferential unbalance-wear counter-wedge profile.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of an oxygen-free atmosphere during heating on anthocyanin,organic acid,and color of strawberry puree

引用

Food Bioscience 2022年第6期50卷 695-703页

作者： Ah-Na Kim Kyo-Yeon lee Chae-Yeon Han Hyun-Jin Kim Sung-Gil Choi Division of Applied Life Science Gyeongsang National UniversityJinju52828South Korea Research Group of Safety Distribution Korea Food Research InstituteWanju-gun55365Republic of Korea Division of Food Science and Technology (Institute of Agriculture and Life Sciences) Gyeongsang National UniversityJinju52828South Korea

Strawberries were ground and heated under oxygen-free condition using a specially designed device,and compared with the berries processed at atmospheric *** complete inactivation of oxidative enzymes and microorganisms were found in both *** heating without oxygen led to higher concentrations of anthocyanins and organic acids than with oxygen,resulting in higher redness and antioxidant ***,the greatest effect of anaerobic condition was observed in delphinidin-3-glycoside and ascorbic acid which are the most sensitive to oxidation in presence of ***,some nutrients which are low dependence on oxygen were degraded regardless of insufficient *** was considered that anaerobic condition may inhibit the deterioration related to only oxidation,not non-oxidative reaction during *** results implicated that dissolved oxygen in tissues may cause continuous oxidative *** summary,oxygen-free condition can confer better oxidative stability of antioxidants and color during heating of berry products.

关键词： Thermal processing Oxygen Vacuum Anthocyanin Strawberry Oxidation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatocellular carcinoma in patients with chronic kidney disease

引用

World Journal of Gastroenterology 2013年第16期19卷 2466-2472页

作者： Chern-Horng lee Sen-Yung Hsieh Ja-Liang Lin Maw-Sen Liu Tzung-Hai Yen College of Medicine Chang Gung University Department of General Internal Medicine and Geriatrics Chang Gung Memorial Hospital Liver Research Unit Chang Gung Memorial Hospital Department of Nephrology Chang Gung Memorial Hospital

AIM: To investigate outcomes of hepatocellular carcinomas (HCCs) in patients with chronic kidney disease (CKD). METHODS: Four hundred and forty patients referred between 2000 and 2002 for management of HCCs were categorized according to their CKD stage, i.e. , estimated glomerular filtration rate (eGFR) > 90 (stage 1), 60-90 (stage 2), 30-60 (stage 3), 15-30 (stage 4), and < 15 (stage 5) mL/min per 1.73 m 2 , respectively. Demographic, clinical and laboratory data were collected and mortality rates and cause of mortality were analyzed. The mortality data were examined with Kaplan-meier method and the significance was tested using a log-rank test. An initial univariate Cox regression analysis was performed to compare the frequency of possible risk factors associated with mortality. To control for possible confounding factors, a multivariate Cox regression analysis (stepwise backward approach) was performed to analyze those factors that were significant in univariate models (P < 0.05) and met the assumptions of a proportional hazard model. RESULTS: Most HCC patients with CKD were elderly, with mean age of diagnosis of 60.6 ± 11.9 years, and mostly male (74.8%). Hepatitis B, C and B and C coinfection virus were positive in 61.6%, 45.7% and 14.1% of the patients, respectively. It was found that patients with stages 4 and 5 CKD were not only older (P = 0.001), but also had higher hepatitis C virus carrier rate (P = 0.001), lower serum albumin level (P = 0.001), lower platelet count (P = 0.037), longer prothrombin time (P = 0.001) as well as higher proportions of advanced cirrhosis (P = 0.002) and HCCs (P = 0.001) than patients with stages 1 and 2 CKD. At the end of analysis, 162 (36.9%) patients had died. Kaplan-Meier analysis revealed that patients with stages 4 and 5 CKD suffered lower cumulative survival than stages 1 and 2 CKD (log-rank test, χ 2 = 11.764, P = 0.003). In a multivariate Cox-regression model, it was confirmed that CKD stage [odds ratio (OR) = 1.988, 95

关键词： Hepatocellular carcinoma Hepatitis B virus Hepatitis C virus Chronic kidney disease End-stage renal disease

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Efficient Dynamic Time Warping by Adaptively Controlling the Valid Warping Range

引用

Journal of Measurement Science and Instrumentation 2010年第S1期1卷 168-172页

作者： Seok-Woo Jang Gye-Young Kim Young-Jae Park Hyung-il Choi Dept of Digital Media Anyang University Dept of Computing Soongsil-niversity Dept of Global Media Soongsil-University

Dynamic time warping(DTW)spends most of the time in generating the correlation table,and it establishes the global path constraints to reduce the time ***,the global constraints restrain just in terms of the time *** this paper,we therefore propose another version of DTW,to be called branch-and-bound DTW(BnB-DTW),which adaptively controb its global path constraints by reflecting the contents of input patterns. Experimental results show that the suggested BnB-DTW algorithm performs more efficiently than other conventional DTW approaches while not increasing the optimal warping cost.

关键词： component time series dynamic time warping valid range pruning

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Experimental Stu dies of 374μm ^(15)NH_(3) Optically Pumped Far-Infrared Laser

引用

Chinese Physics Letters 1993年第9期10卷 520-523页

作者： ZU Qinxin W.A.Peebles Chun Jing lee Cardenas S.Burns N.C.Luhmann Institute of Physics Aatdenna Sinica.Beijing 10008 Instieutc of Pktsma and Fusion Research University of CaliforniH at Los AngelesLos AngelesCA 90024USA

374μm far-infrared raliation of ^(15)NH_(3) pumuped by CO_(2) laser has been studied *** fficiecncy of p11 alosorption of the pounp *** of the output power aund freqpeuey were exiuined in *** the plurpose of applixut... 详细信息

关键词： Optically 2μm laser

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：