检索结果-南通市图书馆

Journal of Materials Science & Technology 2022年第6期101卷 85-94页

作者： Fei Pan Lei Cai Yanyan Dong Xiaojie Zhu Yuyang shi wei Lu Shanghai Key Lab.of D&A for Metal-Functional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804China

Considering a series of electromagnetic pollution problems brought by the development of electronic communication technology,more attention has been paid to the research of electromagnetic wave(EMW)absorbing materials with unique composition and ***,under the inspiration of mixeddimensional hierarchical structure,2D Ni_(2)P nanosheets anchored on 1D silk-derived carbon fiber is successfully fabricated as a gratifying resistor-dielectric type *** a controllable pyrolyzation strategy and disproportionated reaction,high-density 2D Ni_(2)P nanosheets were grown vertically and cross-linked on the surface of 1D silk-derived carbon *** sample exhibited superior EMW absorption performance with maximum reflection loss value of–56.9 d B at the thickness of 2.32 mm and the effective absorption bandwidth can reach to 7.2 GHz at the thickness of 1.93 *** addition,the pure Ni_(2)P shows remarkable dielectric characteristic and EMW absorption ability as *** integration of dualconductive loss,enhanced polarization relaxation loss and the multiple scattering in the composites was proved to contribute to the good EMW absorption ***,this work confirms the great potentials of Ni_(2)P as a high-efficient EMW absorbing materials and light a new way in construction of multidimensional absorber.

关键词： Biomass Metal phosphates Mixed-dimensional hierarchical structure Impedance match Electromagnetic wave absorption

Experimental Study on the Compressive Strength of Concrete with Different Wheat Straw Treatment Techniques

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2023年第10期11卷 3681-3692页

作者： Liang Wen Changhong Yan Yehui shi Zhenxiang Wang Gang Liu wei shi Tunnel and Underground Engineering Research Center of Jiangsu Province(TERC) Nanjing210041China School of Civil Engineering and Architecture Anhui University of Science&TechnologyHuainan232001China School of Earth Sciences and Engineering Nanjing UniversityNanjing210023China The First Geological Brigade of Jiangsu Geology and Mineral Exploration Bureau Nanjing210041China

The treatment of wheat straw is very difficult,and its utilization rate is very low;accumulation causes air pollution and even *** make full use of wheat straw resources,we examined how using different physical and chemical methods to treat the wheat straw which can improve its strength abilities,or enhance the activity of wheat straw *** terms of concrete additives,it can reduce the amount of cement *** this paper,we found that alkali treatment can significantly improve the tensile strength of wheat straw fiber,but polyvinyl alcohol treatment has no obvious effect on the strength of wheat straw fiber after alkali *** the same time,we analyzed the wheat straw fiber microstructure through scanning electron microscopy,and we also studied the wheat straw ash chemical composition after 600℃ high-temperature *** the compressive strength test,we found that the strength of concrete decreases with increasing of wheat straw fiber and wheat straw powder content,and the compressive strength of concrete with wheat straw ash instead of 5%cement decreases little,and the strength of the concrete also decreases with the increasing of wheat straw *** the macroscopic observation of the failure form of concrete,we found that the failure form of concrete with wheat straw ash is similar to that of common concrete,while the failure degree of concrete with wheat straw fiber and wheat straw powder is *** the scanning electron microscope test of the concrete,it was found that wheat straw fiber has an effect on the cracking of concrete and the inner compactness of concrete can also be affected by adding wheat straw ash and wheat straw powder.

关键词： Wheat straw ash tensile strength scanning electron microscope compressive strength concrete

Perceptions of Generic Drugs in the Pharmacists of Public Hospitals:A Cross-sectional Survey in Hubei Province of 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

Current Medical Science 2021年第5期41卷 987-995页

作者： wei-jie LI Mei-jun XIA shi-wei GONG Yu-feng DING Department of Pharmacy Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Pharmacy Business and Administration School of PharmacyTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

Objective:Generic drugs provide an opportunity for savings in drug expenditure since they are available at a lower cost and do not affect patients’health.A better understanding of pharmacists’knowledge,attitudes,and perception can promote the quality use of generic *** objective of this study was to investigate the knowledge,attitudes,and perception of pharmacists from tertiary hospitals in China regarding generic ***:A cross-sectional survey using a postal questionnaire was conducted,which was sent to 200 hospital pharmacists randomly selected from tertiary hospitals in Hubei Province.A total of 125 questionnaires out of 200 were *** the respondents,80 were female and 45 were ***:The majority of respondents(87.2%)could clearly distinguish between original and generic *** agreed that generic drugs were less effective(52.8%)and produced more side effects(52%).Forty-nine respondents thought that generic drug products were not adequately *** 78% and 60% of the pharmacists indicated that generic substitution was not feasible for drugs with narrow therapeutic windows and drugs for critical diseases,*** of them supported the recommendation of generic drugs based on professional ***:Our study showed that a considerable portion of Chinese hospital pharmacists hold negative perceptions of generic *** to improve pharmacists'knowledge of generic drugs are needed.

关键词： generic drugs substitution pharmacist perceptions

Time-Grating for the Generation of STUD Pulse Trains

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第4期30卷 85-87页

作者： ZHENG Jun WANG shi-wei XU Jian-Qiu Key Laboratory for Laser Plasmas(Ministry of Education and Department of Physics Shanghai Jiao Tong UniversityShanghai 200240

Spike train of uneven duration or delay(STUD)pulses hold potential for laser-plasma interaction(LPI)control in laser *** technique based on time grating is applied to generate an STUD pulse *** grating,a temporal analogy of the diffraction grating,can control the pulse width,shape,and repetition rate easily through the use of electro-optical *** pulse width and repetition rate are given by the modulation frequency and depth of the phase modulation function in theory and numerical *** zero-chirped phase modulation is good for the compression effect of the time grating.A principle experiment of two pulses interfering is shown to verify the time grating function.

关键词： function. pulse repetition

Single-shot measurement of THz pulses

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第5期29卷 37-40页

作者： Lei Yang Lei Hou Chengang Dong wei shi Key Laboratory of Ultrafast Photoelectric Technology and Terahertz Science in Shaanxi Xi’an University of TechnologyXi’an 710048China

Terahertz(THz) waves have shown a broad prospect in the analysis of some dielectric materials because of their special properties. For the ultrafast irreversible processes, the THz single-shot measurement is a good choice. In this paper,a single-shot system is investigated, where a pump beam is used to generate THz pulses with high electrical field by optical rectification in LiNbO3, the probe beam with wavefront tilted by a blazed grating is used for single-shot measurement. The time window is up to 90 ps, the signal to noise ratio is 2000 : 1, the spectrum covers from 0.1 THz to about 2.0 THz, and the spectral resolution is 0.011 THz. The single-shot measurement result agrees well with that of a traditional electrical-optic sampling method.

关键词： terahertz waves tilted wavefront single-shot measurement

Crosstalk of cold and gibberellin effects on bolting and flowering in flowering Chinese cabbage

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2019年第5期18卷 992-1000页

作者： SONG shi-wei LEI Yu-ling HUANG Xin-min SU wei CHEN Ri-yuan HAO Yan-wei College of Horticulture South China Agricultural University

The flower stalk is the product organ of flowering Chinese cabbage(Brassica campestris *** *** Tsen et Lee),which is cultivated extensively in South *** stalk formation and development,including bolting and flowering,determine the yield of flowering Chinese cabbage;however,the bolting and flowering mechanisms remain to be *** elucidate these processes,we studied the effects of low-temperature and gibberellin(GA)treatments,and their interaction,on stem elongation,bolting time,flowering time,hormone content,and cell morphology in stem of flowering Chinese *** results showed that both cold and GA treatments accelerated bolting time,stem elongation,and flowering ***,cold and GA cotreated plants displayed additive positive *** addition,cold treatments increased the GA,indole-3-acetic acid,and cytokinin contents and altered cell size in the shoot apices of flowering Chinese *** with uniconazole,a GA synthesis inhibitor,strongly delayed bolting time,stem elongation,and flowering time,whereas GA,but not cold treatment,rescued this inhibition,indicating that low temperature accelerates bolting and flowering not only through inducing GA in the shoot apices,but also other *** results provide a theoretical basis for further dissecting the regulatory mechanism of bolting and flowering in flowering Chinese cabbage.

关键词： bolting flowering stem elongation cold gibberellin

Last Deglacial Soft-Sediment Deformation at Shawan on the Eastern Tibetan Plateau and Implications for Deformation Processes and Seismic Magnitudes

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2019年第2期93卷 430-450页

作者： ZHONG Ning JIANG Hanchao LI Haibing XU Hongyan shi wei ZHANG Siqi wei Xiaotong Institute of Geology Chinese Academy of Geological Sciences Key Laboratory of Deep-Earth Dynamics Ministry of Natural Resources State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake Administration College of Earth Sciences University of Chinese Academy of Sciences College of Geosciences and Resources China University of Geosciences

The eastern margin of the Tibetan Plateau is characterized by frequent earthquakes; however, research of paleo-earthquakes in the area has been limited^ owing to the alpine topography and strong erosion. Detailed investigations of soft-sediment deformation(SSD) structures are valuable for understanding the trigger mechanisms, deformation processes, and the magnitudes of earthquakes that generate such structures, and help us to understand tectonic activity in the region. To assess tectonic activity during the late Quaternary, we studied a well-exposed sequence of Shawan lacustrine sediments, 7.0 m thick, near Lake Diexi in the upper reaches of the Minjiang River. Deformation is recorded by both ductile structures(load casts, flame structures,pseudonodules, ball-and-pillow structures, and liquefied convolute structures) and brittle structures(liquefied breccia, and microfaults). Taking into account the geodynamic setting of the area and its known tectonic activity, these SSD structures can be interpreted in terms of seismic shocks. The types and forms of the structures,the maximum liquefaction distances, and the thicknesses of the horizons with SSD structures in the Shawan section indicate that they record six strong earthquakes of magnitude 6-7 and one with magnitude >7. A recent study showed that the Songpinggou fault is the seismogenic structure of the 1933 Ms7.5 Diexi earthquake. The Shawan section is located close to the junction of the Songpinggou and Minjiang faults, and records seven earthquakes with magnitudes of ?7. We infer,therefore, that the SSD structures in the Shawan section document deglacial activity along the Songpinggou fault.

关键词： lacustrine sequence soft-sediment deformation(SSD) deformation process earthquake magnitude Shawan eastern Tibetan Plateau

In Situ Dissimilatory Nitrate Reduction to Ammonium in a Paddy Soil Fertilized with Liquid Cattle Waste

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2012年第3期22卷 314-321页

作者： LU wei-wei S.RIYA ZHOU Sheng M.HOSOMI ZHANG Hai-Lin shi wei-Ming State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008(China) Graduate University of Chinese Academy of Sciences Beijing 100049(China) Graduate School of Engineering Tokyo University of Agriculture and TechnologyTokyo 184-8588(Japan) Institute of Engineering Tokyo University of Agriculture and TechnologyTokyo 184-8588(Japan) Department of Plant and Soil Sciences Oklahoma State UniversityStillwaterOK 74078(USA)

Most studies on dissimilatory nitrate reduction to ammonium （DNRA） in paddy soils were conducted in the laboratory and in situ studies are in need for better understanding of the DNRA process. In this study, in situ incubations of soil DNRA using ^15N tracer were carried out in paddy fields under conventional water （CW） and low water （LW） managements to explore the potential of soil DNRA after liquid cattle waste （LCW） application and to investigate the impacts of soil redox potential （Eh） and labile carbon on DNRA. DNRA rates ranged from 3.06 to 10.40 mg N kg 1 dry soil d-1, which accounted for 8.55%-12.36% and 3.88% 25.44% of consumption of added NO3-^15N when Eh at 5 cm soil depth ranged from 230 to 414 mV and -225 to -65 mV, respectively. DNRA rates showed no significant difference in paddy soils under two water managements although soil Eh and/or dissolved organic carbon （DOC） were more favorable for DNRA in the paddy soil under CW management 1 d before, or 5 and 7 d after LCW application. Soil DNRA rates were negatively correlated with soil Eh （P 〈 0.05, n = 5） but positively correlated with soil DOC （P 〈 0.05, n - 5） in the paddy soil under LW management, while no significant correlations were shown in the paddy soil under CW management. The potential of DNRA measured in situ was consistent with previous laboratory studies; and the controlling factors of DNRA in paddy soils might be different under different water managements, probably due to the presence of different microfioras of DNRA.

关键词： labile soil carbon livestock waste ^15N labeling soil redox potential

Advances in endoscopic diagnosis and management of colorectal cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2024年第10期16卷 4045-4051页

作者： shi-wei Li Xiang Liu Si-Yu Sun Department of Gastroenterology Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina Engineering Research Center of Ministry of Education for Minimally Invasive Gastrointestinal Endoscopic Techniques Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

Colorectal cancer(CRC)is a leading global health concern,and early identification and precise prognosis play a vital role in enhancing patient *** is a minimally invasive imaging technique that is crucial for the screening,diagnosis,and treatment of *** editorial discusses the importance of advances in endoscopic techniques,the integration of artificial intelligence,and the potential of novel technologies in enhancing the diagnosis and management of CRC.

关键词： Colorectal cancer Endoscopic diagnosis Endoscopic management Artificial intelligence Endoscopic devices

COLLABORATIVE RESOURCE ALLOCATION OVER A HYBRID CLOUD CENTER AND EDGE SERVER NETWORK

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2017年第4期35卷 423-438页

作者： Houfeng Huang Qing Ling wei shi Jinlin Wang Department of Automation University of Science and Technology of China Hefei 230000 China Coordinated Science Laboratory University of Illinois at Urbana-Champaign USA National Network New Media Engineering Research Center Institute of Acoustics Chinese Academy of Sciences Beijing 100190 China

This paper considers the collaborative resource allocation problem over a hybrid cloud center and edge server network, an emerging infrastructure for efficient Internet services. The cloud center acts as a pool of inexhaustible computation and storage powers. The edge servers often have limited computation and storage powers but are able to provide quick responses to service requests from end users. Upon receiving service requests, edge servers assign them to themselves, their neighboring edge servers, as well as the cloud center, aiming at minimizing the overall network cost. This paper first establishes an optimization model for this problem. Second, in light of the separable structure of the optimization model, we utilize the alternating direction method of multipliers （ADMM） to develop a fully collaborative resource allocation algorithm. The edge servers and the cloud center autonomously collaborate to compute their local optimization variables and prices of network resources, and reach an optimal solution. Numerical experiments demonstrate the effectiveness of the hybrid network infrastructure as well as the proposed algorithm.

关键词： Network resource allocation Distributed network optimization Cloud center,edge server