检索结果-南通市图书馆

Range resolution and sampling frequency trade-off for GPS passive radar

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2022年第1期33卷 28-37页

作者： ZHANG zhuxian ZHENG Yu ZHENG Linhua zhu Peidong College of Electronic Science National University of Defense TechnologyChangsha 410073China College of Electronic Communication and Electrical Engineering Changsha UniversityChangsha 410022China

In a global positioning system(GPS)passive radar,a high resolution requires a high sampling frequency,which increases the computational *** the computational load and the range resolution is *** paper presents a method to trade off the range resolution and the computational load by experimentally determining the optimal sampling frequency through an analysis of multiple sets of GPS satellite data at different sampling *** test data are used to construct a range resolution-sampling frequency trade-off model using least-squares *** theoretical analysis shows that the experimental data are the best fit using smoothing and nthorder derivative *** field GPS C/A code signal-based GPS radar,the trade-off between the optimal sampling frequency is determined to be in the 20461.25–24553.5 kHz range,which supports a resolution of 43–48 *** with the conventional method,the CPU time is reduced by approximately 50%.

关键词： global positioning system(GPS)radar range resolution sampling frequency trade-off

Photonuclear production of medical isotopes^(62,64)Cu using intense laser-plasma electron source

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2019年第6期4卷 30-36页

作者： ZhiGuo Ma HaoYang Lan WeiYuan Liu ShaoDong Wu yi Xu ZhiChao zhu Wen Luo School of Nuclear Science and Technology University of South China421001 HengyangPeople’s Republic of China Key Laboratory for Laser Plasmas(Ministry of Education)and School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Extreme Light Infrastructure–Nuclear Physics RO-077125 MagureleRomania

^(62,64)Cu are radioisotopes of medical interest that can be used for positron emission tomography(PET)***,64Cu hasβ−decay characteristics that allowfor targeted radiotherapy of *** the present work,a novel approach to experimentally demonstrate the production of ^(62,64)Cu isotopes fromphotonuclear reactions is proposed in which large-current laser-based electron(e−)beams are generated fromthe interaction between sub-petawatt laser pulses and near-critical-density *** to simulations,at a laser intensity of 3.431021 W/cm2,a dense e−beamwith a total charge of 100 nCcan be produced,and this in turn produces bremsstrahlung radiation of the order of 1010 photons per laser shot,in the region of the giant dipole *** bremsstrahlung radiation is guided to a natural Cu target,triggering photonuclear reactions to produce themedical isotopes ^(62,64)*** optimal target geometry is employed to maximize the photoneutron yield,and ^(62,64)Cuwith appropriate activities of 0.18 GBq and 0.06 GBq are obtained for irradiation times equal to their respective half-livesmultiplied by *** detection of the characteristic energy for the nuclear transitions of ^(62,64)Cu is also *** results of our calculations support the prospect of producing PET isotopes with gigabecquerel-level activity(equivalent to the required patient dose)using upcoming high-intensity laser facilities.

关键词： intense transitions dipole

HSNR: A Network Representation Learning Algorithm Using Hierarchical Structure Embedding

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2020年第6期29卷 1141-1152页

作者： YE Zhonglin ZHAO Haixing zhu Yu XIAO Yuzhi College of Computer Qinghai Normal University Tibetan Information Processing and Machine Translation Key Laboratory of Qinghai Province Key Laboratory of Tibetan Information Processing Ministry of Education

Vertices in the same group tend to connect densely,and usually share common *** of different sizes reflect the relations of vertices in different ranges,and also reflect the features of different orders of the *** this work,we propose a novel network representation learning algorithm by introducing group features of vertices of different orders to learn more discriminative network representations,named as network representation learning algorithm using Hierarchical structure embedding(HSNR).HSNR algorithm firstly constructs hierarchical relations of network structures of different orders based on greedy algorithm and *** order to introduce hierarchical features into the network representation learning model,HSNR algorithm then introduces the idea of multi-relational modeling from knowledge representation,and converts the hierarchical relations into the triplet form between ***,HSNR proposes a joint learning model embedding vertex triplets into the network *** experimental results show that the HSRN algorithm presented has an excellent performance in network vertex classification task on three real-world datasets.

关键词： graph theory greedy algorithms knowledge representation learning (artificial intelligence) network vertex classification task HSRN algorithm joint learning model knowledge representation network representation learning model hierarchical features greedy algorithm network structures hierarchical relations HSNR algorithm discriminative network representations group features novel network representation vertices Hierarchical structure embedding network representation learning algorithm Network representation learning Network embedding Network vertex embedding Network data mining Network feature encoding

Role of NO and SO_(2)in mercury oxidation over a La_(2)O_(3)/Fe_(2)O_(3)catalyst with high thermal stability

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2021年第11期33卷 36-44页

作者： Ruihui Liu Yang Yang Tingyu zhu Wenqing Xu School of Resources and Ciuil Engineering Northeastern UniversityShenyang 110819China Research Center for Process Pollution Control National Engineering Laboratory for Hydrometallurgical Cleaner Production TechnologyInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China National Engineering Laboratory for Flue Gas Pollutants Control Technology and Equipment Tsinghua UniversityBeijing 100084China

In this study,the thermal stability of a ferric oxide catalyst for mercury oxidation was found to be considerably promoted by doping with La_(2)O_(3).The catalysts doped with La_(2)O_(3)maintained a higher surface area when subjected to high-temperature calcination,with lower average pore size and a narrower pore size distribution.X-ray diffraction(XRD)results revealed that La_(2)O_(3)doping hinders the growth of catalyst particles and crystallization of the material at high *** NO and SO_(2)inhibited Hg^(0)oxidation over the La_(2)O_(3)/Fe_(2)O_(3)*** transform infrared(FTIR)spectra revealed that SO_(2)reacts with O_(2)over the catalysts to form several species that are inert for mercury oxidation,such as S042^(-),HS04^(-),or other related species;these inert species cover the catalyst surface and consequently decrease Hg^(0)oxidation *** addition,NO or SO_(2)competed with Hg^(0)for active sites on the La_(2)O_(3)/Fe_(2)O_(3)catalyst and hindered the adsorption of mercury,thereby inhibiting subsequent Hg^(0)***^(0)oxidation on the La_(2)O_(3)/Fe_(2)O_(3)catalyst mainly followed the Eley-Rideal ***,the inhibition effects of NO and SO_(2)were at least partially reversible,and the catalytic activity was temporarily restored after eliminating NO or S0_(2).

关键词： Mercury Flue gas Fe_(2)O_(3) La_(2)O_(3) Thermal stability

在线全文

学校读者我要写书评

暂无评论

论康德反思判断力的“认识意图”

南昌大学学报（人文社会科学版） 2017年第1期48卷 27-32页

作者：朱毅复旦大学哲学学院上海200433

反思判断力是康德《判断力批判》的核心概念,一方面,它为思辨理性与实践理性之间的联结搭起一座桥梁,使理论与实践、自然与自由领域之间能够互通;另一方面,作为独立的先天情感能力,它在直观对象的基础上引发诸认识活动的自由协调,使知... 详细信息

反思判断力是康德《判断力批判》的核心概念,一方面,它为思辨理性与实践理性之间的联结搭起一座桥梁,使理论与实践、自然与自由领域之间能够互通;另一方面,作为独立的先天情感能力,它在直观对象的基础上引发诸认识活动的自由协调,使知性向理性的过渡得以可能。严格来说,反思判断力并不致力于认识,而是针对自然整体做出的合目的性反思。但由于它力图寻求自然知识的系统性,与思辨理性内在运用的根本目的具有内在相关性,因而蕴涵一种隐而不彰的"认识意图";在运用方式上,判断力的反思性运用推进、扩展了思辨理性对经验的内在运用,是"系统性"理念调节运用另一重不可忽视的维度。

关键词：康德反思判断力思辨理性认识意图 “系统性”理念

Centrifuge tests for seismic response of single pile foundation supported wind turbines in sand influenced by earthquake history

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2023年第3期22卷 623-636页

作者： Wang Yubing Zhang Zhongchang Wu Xiaofeng zhu Bin Center for Hypergravity Experiment and Interdisciplinary Research College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou 310058China Hangzhou Urban Construction&Investment Group Co. Ltd.Hangzhou 310005China MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou 310058China

This paper reports on two sets of centrifuge model tests of wind turbines in dry sand and saturated sand subjected to earthquake *** wind turbine system is composed of a single pile foundation and a wind *** tests were applied with liquefaction experiments and analysis projects(LEAP)waves to simplify the *** objectives of the tests are to investigate:(1)the influence of earthquake history on the seismic response of wind turbines;(2)the influence of earthquake history on the dynamic pile-soil interaction;and(3)the influence of two different foundation types on the seismic response of wind *** tests indicated that earthquake history has a significant influence on the natural frequency of the pile and the soil around the pile in the saturated sand,but has no obvious influence on the dry *** shear modulus of the soil and the acceleration amplification factor of the pile top in both tests increased and the maximum bending moment envelope of the single pile foundation *** stiffness of the p-y curve in saturated sand was increased by the earthquake history,while that in dry sand was not significantly affected.

关键词： earthquake history effect wind turbine pile bending moment dry and saturated sand ground dynamic p-y curves

Powder transport behavior in RH degasser with powder injection through up snorkel: a transient numerical model

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2023年第6期30卷 1156-1170页

作者： zhuang Liu Wen-tao Lou Miao-yong zhu Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

A transient numerical model was established to predict the dispersion,distribution,and circulation behavior of the powder injected through the up snorkel in a Ruhrstahl–Heraeus(RH)*** effects of the powder diameter,the lifting gas flow rate,and the powder injection rate on the powder transport were *** powder concentration was measured by a cold *** results showed that the predicted powder concentration agreed well with the *** powder injection process is divided into three periods,named dispersion period,aggregation and circulation period,and dynamically stable period according to the powder transport *** powder diameter has a great effect on the particle *** the particles size changes from 30 to 500μm,the powder dispersion characteristic index changes from 0.110 to 0.741,and the ladle top zone powder mass ratio changes from 0.118 to *** powder circulation mass flow rate increases to 101.0 kg min^(-1)(150μm)and then decreases to 46.6 kg min^(-1)(500μm).Powders with a diameter of more than 220μm can change the steel flow mode in the RH *** the lifting gas flow could slightly improve the powder *** in the powder injection rate has almost no effect on the powder dispersion.

关键词： RH degasser Powder injection Numerical simulation Eulerian-granular flow Powder transport behavior Optical probe

Cell models and drug discovery for mitochondrial diseases

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

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2019年第5期20卷 449-456页

作者： Shuang-yi HU Qian-qian zhuANG Yue QIU Xu-fen zhu Qing-feng YAN Institute of Genetics and Regenerative Biology College of Life SciencesZhejiang UniversityHangzhou310058China Department of Pediatrics the First Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou310003China Key Laboratory for Cell and Gene Engineering of Zhejiang Province Hangzhou310058China.

Mitochondrion is a semi-autonomous organelle,important for cell energy metabolism,apoptosis,the production of reactive oxygen species(ROS),and Ca2+*** DNA(mtDNA)mutation is one of the primary factors in mitochondrial *** much progress has been made,there remain many difficulties in constructing cell models for mitochondrial *** seriously restricts studies related to targeted drug discovery and the mechanism and therapy for such *** we summarize the characteristics of patient-specific immortalized lymphoblastoid cells,fibroblastoid cells,cytoplasmic hybrid(cybrid)cell lines,and induced pluripotent stem cells(iPSCs)-derived differentiation cells in the study of mitochondrial disorders,as well as offering discussion of roles and advances of these cell models,particularly in the screening of drugs.

关键词： Mitochondrial diseases Mitochondrial DNA Cell model Drug discovery

Development of an automatic monitoring system for rice light-trap pests based on machine vision

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2020年第10期19卷 2500-2513页

作者： YAO Qing FENG Jin TANG Jian XU Wei-gen zhu Xu-hua YANG Bao-jun LU Jun XIE yi-ze YAO Bo WU Shu-zhen KUAI Nai-yang WANG Li-jun School of Information Science and Technology Zhejiang Sci-Tech UniversityHangzhou 310018P.R.China State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 310006P.R.China Plant Protection Quarantine and Pesticide Management Station of ZhejiangHangzhou 310020P.R.China Zhejiang Top Cloud-agri Technology Co Ltd.Hangzhou 310015P.R.China Agricultural Technology Extension Center of Shangyu Shaoxing 312300P.R.China Agricultural Technology Extension Center of Keerqin Keerqin 137713P.R.China

Monitring pest populations in paddy fields is important to effectively implement integrated pest *** traps are widely used to monitor field pests all over the *** conventional light traps still involve manual identification of target pests from lots of trapped insects,which is time-consuming,labor-intensive and error-prone,especially in pest peak *** this paper,we developed an automatic monitoring system for rice light-trap pests based on machine *** system is composed of an itelligent light trap,a computer or mobile phone client platform and a cloud *** light trap firstly traps,kills and disperses insects,then collects images of trapped insects and sends each image to the cloud *** target pests in images are automatically identifed and counted by pest identification models loaded in the *** avoid light-trap insects piling up,a vibration plate and a moving rotation conveyor belt are adopted to disperse these trapped *** was a close correlation(r=0.92)between our automatic and manual identification methods based on the daily pest number of one-year images from one light *** experiments demonstrated the effectiveness and accuracy of our automatic light trap monitoring system.

关键词： automatic monitoring system light trap rice pest machine vision image processing convolutional neural network