检索结果-南通市图书馆

China Communications 2022年第9期19卷 37-46页

作者： xiangling li Wenjing Shi School of Information Science and Technology Beijing University of Chemical TechnologyBeijing 100029China Beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 100084China

The hybrid satellite-UAV-terrestrial maritime networks have shown great promise for broadband coverage at *** existing works focused on vessels collaboratively served by UAV-enabled aerial base station(ABSs)and terrestrial base stations(TBSs)deployed along the coast,and proved that data rate could be improved by optimizing transmit power and ABS’s *** practice,users on a vessel can be collaboratively served by an ABS and a vesselenabled base station(VBS)in different *** this case,how to select the network for users on a vessel is still an open *** this paper,a TBS and a satellite respectively provide wireless backhaul for the ABS and the *** network selection is jointly optimized with transmit power of ABS and VBS,and ABS’s position for improving data rate of all *** solve it by finding candidates for network selection and iteratively solving transmit power and ABS’s position for each *** results demonstrate that data rate can be improved by collaborative coverage for users on a vessel.

关键词： maritime communications satellite-UAV-terrestrial network network selection power allocation

TIMODAZ:A successful international cooperation project to investigate the thermal impact on the EDZ around a radioactive waste disposal in clay host rocks

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2013年第3期5卷 231-242,252页

作者： xiangling li ESV EURIDICE CIE (The European Underground Research Infrastructure for Disposal of Nuclear Waste in Clay Environment)

Disposal of spent nuclear fuel and long lived radioactive waste in deep clay geological formations is one of the promising options worldwide. In this concept of the geological disposal system, the host clay formation is considered as a principal barrier on which the fulfillment of key safety functions rests. Between 2006 and 2010, the European Commission project TIMODAZ, which gathered 15 partners from 8 countries, has investigated the coupled thermo-hydro-mechanical （THM） effects on clay formations for geological disposal of radioactive waste, and specific attention was paid to investigating the thermal effect on the evolution of the damaged zone （DZ）. Three types of potential host clay formations were investigated： the Boom Clay （Belgium）, the Opalinus Clay （Switzerland） and the Callovo-Oxfordian argillite （France）. Intensive experimental （laboratory and in situ in underground research laboratories） and numerical studies have been performed. Multi-scale approach was used in the course of the project. High degree of similarities between the failure modes, sealing process, stress paths, deformation, etc., observed in laboratories and in situ has been obtained, which increased the confidence in the applicability of laboratory test results and up-scaling perspective. The results of the laboratory and in situ tests obtained allowed the parameters for numerical models at various scales to be derived and provided the basis for the simplified performance assessment models that are used to assess the long-term safety of a repository. The good cooperation between the numerical modeler and experimenters has allowed an in-depth analysis of the experimental results and thus better understanding the underlying processes, and consequently increased the capabilities to model the THM effects in claystones. This paper presents the main achievements obtained by TIMODAZ project and shows how a European scientific community investigates a problem of concern in a collaborative way and

关键词： Nuclear waste disposal Damaged zone (DZ) Thermo-hydro-mechano-chemical (THMC) perturbation Clay formations Performance assessment (PA) Safety case Multi-scale

Study on the adsorptive catalytic voltammetry of aloe-emodin at a carbon paste electrode

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2005年第5期48卷 442-448页

作者： li Ju'nan GAO Peng li xiangling YAN Zhihong MAO Xun College of Chemistry Xiangtan University Xiangtan 411105 China College of Chemistry Xiangtan University Xiangtan 411105 China College of Chemistry Xiangtan University Xiangtan 411105 China College of Chemistry Xiangtan University Xiangtan 411105 China College of Chemistry Xiangtan University Xiangtan 411105 China

A new catalytic voltammetric method for the determination of anthraqunone medi-cines at a carbon paste electrode (CPE) was described for the first time. The mechanism of the catalytic reaction was investigated by using linear sweep voltammetry, cyclic voltammetry, con-stant potential electrolysis and so on. The experiment results indicate that aloe-emodin was effi-ciently accumulated at a CPE by adsorption. In the following potential scan, aloe-emodin was reduced to homologous anthrahydroquinone compound, then the compound was immediately oxidized to aloe-emodin by the dissolved oxygen, and the aloe-emodin was again reduced at the CPE. As a result, a cyclic catalytic reaction was established. But a reversible redox reaction of aloe-emodin can only be observed at a mercury electrode, no catalytic reaction occurs there. A sensitive catalytic voltammetric peak of aloe-emodin was obtained at about ?0.60 V (vs. SCE) in 0.56 mol/L NH3-NH4Cl buffer (pH 8.9). The proposed method was applied to the determination of aloe-emodin in the Radix Rhei with satisfactory results. The determination results were in good agreement with reference values obtained by the HPLC. The adsorptive catalytic voltammetry for the determination of organic compound at CPE, chemically modified electrode and other solid electrodes could be significant in the studies on pharmacology, pharmacodynamics, toxicity of medicine, clinical medicine and biochemistry.

关键词： aloe-emodin, adsorptive catalytic voltammetry, carbon paste electrode.

Combined garnet,scheelite and apatite U-Pb dating of mineralizing events in the Qiaomaishan Cu-W skarn deposit,eastern China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2023年第1期14卷 17-32页

作者： Yue li Feng Yuan Simon M.Jowitt xiangling li Taofa Zhou Fangyue Wang Yufeng Deng Ore Deposit and Exploration Centre(ODEC) Hefei University of TechnologyHefei 23009China Anhui Province Engineering Research Center for Mineral Resources and Mine Environments Hefei 23009China Department of Geoscience University of Nevada Las Vegas4505 S.Maryland Pkwy.NV 89154-4010USA

Determining the precise timing of mineralization and mineralizing events is crucial to understanding regional mineralizing and other geological events and ***,there are a number of mineralogical and analytical limitations to the approaches developed for the absolute dating of mineralizing systems,such as molybdenite Re-Os and zircon and garnet U-Pb,among *** means that the precise and accurate dating of mineralizing systems that may not contain minerals suitable for dating using existing approaches requires the development of new(and ideally in situ)approaches to absolute *** study outlines a new in situ analytical approach that has the potential to rapidly and accurately evaluate the timing of ore *** study employs a novel application of in situ scheelite U-Pb dating analysis using laser ablation-inductively coupled plasma-mass spectrometry(LA-ICP-MS)and samples from the Qiaomaishan deposit,a representative example of skarn mineralization within the Xuancheng ore district of eastern *** approach to scheelite dating of the deposit is verified by cross-comparison to dating of cogenetic garnet and apatite,proving the effectiveness of this *** new approach to dating of scheelite-bearing geological systems is rapid,cheap,requires little sample preparation,and is undertaken in situ,allowing crucial geological and mineralogical context to be retained during *** approaches outlined here not only allow the determination of the absolute timing of formation of the Qiaomaishan deposit through the U-Pb dating of scheelite[138.6±3.2 Ma,N=39,mean square weighted deviation(MSWD)=1.17],garnet(138.4±1.0 Ma,N=40,MSWD=1.3),and apatite(139.6+3.3 Ma,N=35,MSWD=0.72),but also further supports the theoretical genetic links between this mineralization and the emplacement of a proximal porphyritic granodiorite intrusion(zircon U-Pb age:139.5±1.2 Ma,N=23,MSWD=0.3).Moreover,our research indicates that the higher the concentrations

关键词： In-situ scheelite U-Pb dating In-situ garnet U-Pb dating In-situ apatite U-Pb dating Qiaomaishan skarn deposit

Smartphone-powered iontophoresis-microneedle array patch for controlled transdermal delivery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2020年第1期6卷 13-26页

作者： Jingbo Yang Yanjun li Rui Ye Ying Zheng xiangling li Yuzhen Chen Xi Xie Lelun Jiang Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument School of Biomedical EngineeringSun Yat-Sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China

The incidence rate of diabetes has been increasing every year in nearly all nations and *** traditional control of diabetes using transdermal insulin delivery by metal needles is generally associated with pain and potential *** microneedle arrays(MAs)have emerged as painless delivery techniques,the integration of MA systems with electronic devices to precisely control drug delivery has rarely been *** this study,we developed an iontophoresis-microneedle array patch(IMAP)powered by a portable smartphone for the active and controllable transdermal delivery of *** IMAP in situ integrates iontophoresis and charged nanovesicles into one patch,achieving a one-step drug administration strategy of“penetration,diffusion and iontophoresis”.The MA of the IMAP is first pressed on the skin to create microholes and then is retracted,followed by the iontophoresis delivery of insulin-loaded nanovesicles through these microholes in an electrically controlled *** method has synergistically and remarkably enhanced controlled insulin *** amount of insulin can be effectively regulated by the IMAP by applying different current *** in vivo study has demonstrated that the IMAP effectively delivers insulin and produces robust hypoglycemic effects in a type-1 diabetic rat model,with more advanced controllability and efficiency than delivery by a pristine microneedle or *** IMAP system shows high potential for diabetes therapy and the capacity to provide active as well as long-term glycemic regulation without medical staff care.

关键词： needle patch delivery

Semi-Implantable Bioelectronics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2022年第7期14卷 354-408页

作者： Jiaru Fang Shuang Huang Fanmao liu Gen He xiangling li Xinshuo Huang Hui-jiuan Chen Xi Xie State Key Laboratory of Optoelectronic Materials and Technologies Guangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510006People’s Republic of China

Developing techniques to effectively and real-time monitor and regulate the interior environment of biological objects is significantly important for many biomedical engineering and scientific applications, including drug delivery, electrophysiological recording and regulation of intracellular activities. Semi-implantable bioelectronics is currently a hot spot in biomedical engineering research area, because it not only meets the increasing technical demands for precise detection or regulation of biological activities, but also provides a desirable platform for externally incorporating complex functionalities and electronic integration. Although there is less definition and summary to distinguish it from the well-reviewed non-invasive bioelectronics and fully implantable bioelectronics, semi-implantable bioelectronics have emerged as highly unique technology to boost the development of biochips and smart wearable device. Here, we reviewed the recent progress in this field and raised the concept of “Semi-implantable bioelectronics”, summarizing the principle and strategies of semi-implantable device for cell applications and in vivo applications, discussing the typical methodologies to access to intracellular environment or in vivo environment, biosafety aspects and typical applications. This review is meaningful for understanding in-depth the design principles, materials fabrication techniques, device integration processes, cell/tissue penetration methodologies, biosafety aspects, and applications strategies that are essential to the development of future minimally invasive bioelectronics.

关键词： Semi-implantable bioelectronics Cell applications In vivo applications

Responses of photosynthetic characteristics and enzyme activity of nitrogen metabolism to low nitrogen in maize with different nitrogen tolerance

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2020年第6期13卷 133-143页

作者： Pengtao Ji Yongwei Cui xiangling li Kai Xiao Peijun Tao Yuechen Zhang College of Agronomy Hebei Agricultural University/State Key Laboratory of North China Crop Improvement and RegulationBaoding 071001HebeiChina Academy of Agricultural Planning and Engineering Ministry of Agriculture and Rural AffairsBeijing 100125China College of Agronomy and Biotechnology Hebei Normal University of Science&TechnologyQinhuangdao 066004HebeiChina

Understanding the physiological processes associated with leaf photosynthetic characteristics and nitrogen(N)assimilation during grain-filling stage are helpful for enhancing nitrogen utilization efficiency(NUtE)of *** this study,the leaf photosynthetic and N assimilation parameters in maize,including Zhengdan 958(ZD958),a low-N tolerance cultivar and Huanong 138(HN138),a low-N sensitive cultivar under different N rates were *** showed that ZD958 displayed significant increases on grain yield and NUtE than that in *** on the leaf photosynthetic and N assimilation-associated processes indicated that ZD958 had higher leaf N remobilization(Rem N),net photosynthetic rate(Pn)and photosynthetic N use efficiency(PNUE)with respect to those of HN138 during grain-filling *** addition,ZD958 was also shown to be higher activities of leaf nitrate reductase(NR),glutamine synthetase(GS),nitrate reductase(GDH)and glutamine synthetase(GAGOT)than those of *** leaf PNUE was significantly positively correlated with NR,GS,GDH,GOGAT suggesting that leaf PNUE and NR,GS,GDH,GOGAT jointly determined the N remobilization efficiency and the leaf N remobilization during *** results suggested that ZD958 possessed improved PNUE,NR and GS activities in leaves during grain-filling stage that contributes improve grain weights and yield formation capacities upon under low-N conditions.

关键词： low-N photosynthesis nitrogen assimilation nitrogen utilization efficiency maize

Molybdenite Re-Os,titanite and garnet U-Pb dating of the Magushan skarn Cu-Mo deposit,Xuancheng district,Middle-Lower Yangtze River Metallogenic Belt

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2021年第3期12卷 399-415页

作者： Yue li Feng Yuan Simon M.Jowitt Fangyue Wang xiangling li Yufeng Deng Yunyue Wang Taofa Zhou School of Resources and Environmental Engineering Hefei University of TechnologyHefei 23009China Anhui Province Engineering Research Center for Mineral Resources and Mine Environments Hefei University of TechnologyHefei 23009China Department of Geoscience University of Nevada Las Vegas4505 S.Maryland Pkwy.NV 89154-4010USA

The Magushan skarn Cu-Mo deposit is a representative example of the skarn mineralization occurring within the Xuancheng ore district of the Middle-Lower Yangtze River Metallogenic Belt of eastern *** precise age of an ore deposit is important for understanding the timing of mineralization relative to other geological events in a region and to fully place the formation of a mineral deposit within the geological context of other processes that occur within the study ***,we present new molybdenite Re-Os and titanite and andradite garnet U-Pb ages for the Magushan deposit and use these data to outline possible approaches for identifying genetic relationships in geologically complex *** spatial and paragenetic relationships between the intrusions,alteration,and mineralization within the study area indicates that the formation of the Magushan deposit is genetically associated with the porphyritic ***,this is not always the case,as some areas contain complexly zoned plutons with multiple phases of intrusion or mineralization may be distal from or may not have any clear spatial relationship to a *** means that it may not be possible to determine whether the mineralization formed as a result of single or multiple magmatic/hydrothermal *** such,the approaches presented in this study provide an approach that allows the identification of any geochronological relationships between mineralization and intrusive events in areas more complex than the study *** published zircon U-Pb data for the mineralization-related porphyritic granodiorite in this area yielded an age of 134.2±1.2 Ma(MSWD=1.4)whereas the Re-Os dating of molybdenite from the study area yielded an isochron age of 137.7±2.5 Ma(MSWD=0.43).The timing of the mineralizing event in the study area was further examined by the dating of magmatic accessory titanite and skarn-related andradite garnet,yielding U-Pb ages of 136.3±2.5 Ma(MSWD=3.2)and 135.9±2.7 Ma(MSWD=2.

关键词： Magushan skarn deposit Molybdenite Re-Os dating Titanite U-Pb dating Garnet U-Pb dating Xuancheng ore district Middle-Lower Yangtze River Metallogenic Belt

Effects of reducing and postponing controlled-release urea application on soil nitrogen regulation and maize grain yield

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2022年第1期15卷 116-123页

作者： Pengtao Ji Yujuan Peng Yongwei Cui xiangling li Peijun Tao Yuechen Zhang College of Agronomy Hebei Agricultural University/State Key Laboratory of North China Crop Improvement and RegulationBaoding 071001HebeiChina Academy of Agricultural Planning and Engineering Ministry of Agriculture and Rural AffairsBeijing 100125China College of Agronomy and Biotechnology Hebei Normal University of Science&Technology/Hebei Key Laboratory of Crop Stress BiologyQinhuangdao 066004HebeiChina

Controlled-release urea(CRU-N)fertilizer application is a solution to improve the utilization rate of nitrogen(N),reduces economic costs and improves crop *** is significant to study the effects of release CRU-N reduction and the combined application of conventional urea on soil N control and the large-scale maize planting *** this study,the effects of controlled-release nitrogen fertilizer reduction and postponement on soil nitrogen components,enzyme activities,and yields were *** treatments were set up in this study,including no N fertilizer(CK),100%conventional urea(U),100%controlled-release urea(S),30%controlled-release urea(SU_(3/7)),50%controlled-release urea(SU_(5/5)),70%controlled-release urea(SU_(7/3))and Sodium Salt of Polyaspartic Acid(PASP)-*** results showed that mixed CRU-N and urea increased yields and net benefits compared with conventional urea at the same application rate of N,and reduced N *** application of CRU-N at 70%for maize represented the best overall *** with U treatment,soil ammonium nitrogen(NH_(4)-N),soil nitrate-nitrogen(NO_(3)-N),and microbial biomass nitrogen(SMB-N)of CRU-N at 70%(SU_(7/3))increased by 35.00%,15.53%,and 25.04%.However,soil nitrate reductase(S-NR)and urease(S-UA)were the best in SU_(5/5) and significantly higher than other *** applications of CRU-N would effectively increase soil N;CRU-N in 50%proportion can promote the maize root growth and improve the efficient utilization of N by soil *** the yields(9186.61 kg/hm^(2)),expertly in the proportion of 70%CRU-N(SU_(7/3))plays a vital role in a wheat-maize rotation system,which can potentially be used to improve the yields,nitrogen use efficiency,and net benefit with low N *** conclusion,using CRU-N fertilize effectively improves soil nitrogen,and various ratios of CRU-N can ensure the continuous release the nutrients during the growing *** among the different proportions of CRU-N,it i

关键词： controlled-release urea nitrogen regulation maize grain yield soil reducing postponing

Soil physical properties,nutrients,and crop yield with two-year tillage rotations under a winter wheat-summer maize double cropping system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2022年第1期15卷 172-181页

作者： Baozhong Yin Pan liu Yongwei Cui Zhaohui Hu xiangling li Zhihua Pan Wenchao Zhen College of Resources and Environment Sciences China Agricultural UniversityBeijing 100193China College of Plant Protection Hebei Agricultural UniversityBaoding 071001HebeiChina State Key Laboratory of North China Crop Improvement and Regulation Baoding 071001HebeiChina College of Agronomy Hebei Agricultural UniversityBaoding 071001HebeiChina Academy of Agricultural Planning and Engineering Ministry of Agriculture and Rural AffairsBeijing 100125China College of life Science Hebei Agricultural UniversityBaoding 071001HebeiChina Hebei Normal University of Science and Technology Qinhuangdao 066000HebeiChina Key Laboratory of Crop Growth Regulation of Hebei Province Baoding 071001HebeiChina

Winter wheat and summer maize were planted from 2015-2017 to study the effects of different rotational tillage patterns on soil physicochemical properties,crop yield,water content,and fertilizer *** tillage treatments were designed as wheat subsoiling-maize no tillage(WS-MN),wheat rotary tillage-maize subsoiling(WR-MS),wheat subsoiling-maize subsoiling(WS-MS),and conventional wheat rotary tillage-maize no tillage(WR-MN)as a *** the four treatments,WS-MN and WR-MS were single-season subsoiling treatments,and WS-MS was a two-season subsoiling *** average soil bulk density decreased by 7.6%in the single-and double-season subsoiling groups compared to the WR-MN group,and the total porosity and noncapillary porosity increased by 10.7%and 12.2%,***-or double-season subsoiling treatment was not conducive to water storage in the 0-20 cm soil layer but increased the water content of the 20-140 cm soil layer,and the average soil water content of the 0-140 cm layer was increased by 11.6%in the two-growing season treatment groups compared with the WR-MN *** WS-MS and WS-MN groups compared with the WR-MN group,the soil ammonium nitrogen content was increased by an average of 18.6%in 0-20 cm soil and 16.8%in 20-100 cm soil;soil nitrate-nitrogen content was decreased by 13.5%in 0-100 cm soil;total organic carbon and microbial carbon contents in the 15-30 cm soil were increased by 18.1%and 12.7%,respectively;and soil urease,catalase,and alkaline phosphatase activities were increased by 46.1%,15.2%,and 23.1%,*** crop yield and water use efficiency increased by 8.9%and 15.0%,respectively,in both the single-and double-season subsoiling treatment *** study demonstrated the advantages of subsoiling tillage and suggested that it is suitable for crop cultivation in the Haihe Plain,China.

关键词： tillage rotations wheat-maize double cropping soil properties utilization of water and fertilizer crop yield