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21篇 您的检索式:作者名="Zhenyong ZHANG"
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1Construction of a macromolecular structural model of Chinese lignite and analysis of its low-temperature oxidation behavior显示文摘The aim of this paper is to analyze the change in the active structure of lignite during the process of lowtemperature oxidation by constructing a molecular structure model for lignite. Using quantum computation combined with experimental results of proximate analysis, ultimate analysis, Fourier transform infrared spectroscopy(FTIR) and X-ray photoelectron spectroscopy(XPS), a structural model for the large molecular structure was constructed. By analyzing the bond lengths in the model molecule, the evolution law for the active structure of lignite was predicted for the process of low-temperature oxidation. In low-temperature oxidation,alkanes and hydroxyls are the primary active structures observed in lignite, though ether may also react. These active functional groups react with oxygen to release heat, thereby speeding up the reaction between coal and oxygen. Finally, the content of various functional groups in the process of lignite low-temperature oxidation was analyzed by infrared analysis, and the accuracy of the model was verified.Xianliang Meng Mingqiang Gao Ruizhi Chu Zhenyong Miao Guoguang Wu Lei Bai Peng Liu Yuanfang Yan Pengcheng Zhang 2017Chinese Journal of Chemical Engineering2017,25,9:8
2A Local Cluster of Omicron Variant COVID-19 Likely Caused by Internationally Mailed Document——Beijing Municipality,China,January 2022显示文摘On January 15,2022,a 26 years old female(Case A)went to a sampling site for coronavirus disease 2019(COVID-19)testing due to excessive fatigue and fever for two days.This patient preliminarily tested positive for severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)using a quantitative real-time reverse transcription polymerase chain reaction(qRT-PCR)method.Daitao Zhang Shuangsheng Wu Zhenyong Ren Ying Sun Xiangfeng Dou Zhaomin Feng Fu Li Yi Tian Shujuan Cui Baiwei Liu Bing Lyu Xiaoli Wang Feng Liu Lina Jin Chu Jiang Lina Tian Zhenjiang Xin Zhichao Liang Lei Jia Quanyi Wang Yang Pan Peng Yang 2022China CDC weekly2022,4,14:6
3Experimental study on the effects of drying methods on the stabilities of lignite显示文摘The drying processes are always applied prior to the transportation or utilization of lignite, and result in notable changes in the stabilities of lignite. In this paper, the study on the effects of nitrogen and MTE drying process on the physico-chemical properties and stabilities of Zhaotong lignite was carried out. The briquettes produced by MTE drying in this study were 150 mm in dimension, and so had a much larger particle size than nitrogendried samples. Nitrogen adsorption, mercury intrusion porosimetry and scanning electron microscopy all suggested that drying was accompanied by the transformation of larger pores into smaller ones. Compared to nitrogen drying, the pore structures could be stabilized by the MTE process. The soluble salts were removed during MTE drying which resulted in the decrease in ash and the concentrations of some of the major metals.The removal of water enhanced the hydrophilicity of nitrogen dried samples, but did not affect the hydrophilicity of MTE dried samples. The moisture holding capacity of MTE dried samples reduced faster than nitrogen dried samples with the decrease of residual moisture content. The moisture readsorption processes of MTE dried samples were strongly inhibited due to the much larger particle size of sample produced by MTE drying than nitrogen drying. The susceptibility to spontaneous combustion, indicated by cross point temperature and self-heating tests, of nitrogen and MTE dried samples increased with the decrease of residual moisture content. The MTE dried samples are more liable to spontaneous combustion than nitrogen dried samples with the same residual moisture and particle size. However, the larger particle size of the MTE product made it more stable with respect to spontaneous combustion and also moisture readsorption.Yixin Zhang Jixiang Dong Fanhui Guo Xiaokai Chen Jianjun Wu Zhenyong Miao 2018Chinese Journal of Chemical Engineering2018,26,7:4
4Characteristics of mineral elements in shoots of three annual halophytes in a saline desert, Northern Xinjiang显示文摘Halophytes are valuable salt-, alkali-and drought-resistant germplasm resources. However, the characteristics of mineral elements in halophytes have not been investigated as intensively as those in crops. This study attempted to investigate the characteristics of mineral elements for annual halophytes during their growth period to reveal their possible physiological mechanisms of salt resistance. By using three native annual halophytes (Salsola subcrassa, Suaeda acuminate and Petrosimonia sibirica) distributed in the desert in Northern Xinjiang of China, the dynamic changes in the mineral element contents of annual halophytes were analyzed through field sampling and laboratory analyses. The results demonstrated that the annual halophytes were able to absorb water and mineral nutrients selectively. In the interaction between the annual halophytes and saline soil, the adaptability of the annual halophytes was manifested as the accumulation of S, Na and Cl during the growth period and maintenance of water and salt balance in the plant, thus ensuring their selective absorption of N, P, K, Ca, Mg and other mineral nutrients according to their growth demand. By utilizing this property, halophyte planting and mowing (before the wilting and death periods) could bioremediate heavy saline-alkali soil.Ke ZHANG ChunJian LI ZhongShao LI FuHai ZHANG ZhenYong ZHAO ChangYan TIAN 2013Journal of Arid Land2013,5,2:3
5The Solar Upper Transition Region Imager(SUTRI)Onboard the SATech-01 Satellite显示文摘The Solar Upper Transition Region Imager(SUTRI)onboard the Space Advanced Technology demonstration satellite(SATech-01),which was launched to a Sun-synchronous orbit at a height of~500 km in 2022 July,aims to test the on-orbit performance of our newly developed Sc/Si multi-layer reflecting mirror and the 2k×2k EUV CMOS imaging camera and to take full-disk solar images at the Ne VII 46.5 nm spectral line with a filter width of~3 nm.SUTRI employs a Ritchey-Chrétien optical system with an aperture of 18 cm.The on-orbit observations show that SUTRI images have a field of view of~416×416 and a moderate spatial resolution of~8″without an image stabilization system.The normal cadence of SUTRI images is 30 s and the solar observation time is about16 hr each day because the earth eclipse time accounts for about 1/3 of SATech-01's orbit period.Approximately15 GB data is acquired each day and made available online after processing.SUTRI images are valuable as the Ne VII 46.5 nm line is formed at a temperature regime of~0.5 MK in the solar atmosphere,which has rarely been sampled by existing solar imagers.SUTRI observations will establish connections between structures in the lower solar atmosphere and corona,and advance our understanding of various types of solar activity such as flares,filament eruptions,coronal jets and coronal mass ejections.Xianyong Bai Hui Tian Yuanyong Deng Zhanshan Wang Jianfeng Yang Xiaofeng Zhang Yonghe Zhang Runze Qi Nange Wang Yang Gao Jun Yu Chunling He Zhengxiang Shen Lun Shen Song Guo Zhenyong Hou Kaifan Ji Xingzi Bi Wei Duan Xiao Yang Jiaben Lin Ziyao Hu Qian Song Zihao Yang Yajie Chen Weidong Qiao Wei Ge Fu Li Lei Jin Jiawei He Xiaobo Chen Xiaocheng Zhu Junwang He Qi Shi Liu Liu Jinsong Li Dongxiao Xu Rui Liu Taijie Li Zhenggong Feng Yamin Wang Chengcheng Fan Shuo Liu Sifan Guo Zheng Sun Yuchuan Wu Haiyu Li Qi Yang Yuyang Ye Weichen Gu Jiali Wu Zhe Zhang Yue Yu Zeyi Ye Pengfeng Sheng Yifan Wang Wenbin Li Qiushi Huang Zhong Zhang 2023Research in Astronomy and Astrophysics2023,23,6:1
6Treatment Measures for Obstacles Encountered under a Raw Water Pipe during a Pipe Jacking Construction显示文摘Liu Zhenyong Zhang Yongjun Huang Jinming 2011China Municipal Engineering2011,,6:1
73D-printed cell-free PCL-MECM scaffold with biomimetic micro-structure and micro-environment to enhance in situ meniscus regeneration显示文摘Despite intensive effort was made to regenerate injured meniscus by cell-free strategies through recruiting endogenous stem/progenitor cells,meniscus regeneration remains a great challenge in clinic.In this study,we found decellularized meniscal extracellular matrix(MECM)preserved native meniscal collagen and glycosaminoglycans which could be a good endogenous regeneration guider for stem cells.Moreover,MECM significantly promoted meniscal fibrochondrocytes viability and proliferation,increased the expression of type II collagen and proteoglycans in vitro.Meanwhile,we designed 3D-printed polycaprolactone(PCL)scaffolds which mimic the circumferential and radial collagen orientation in native meniscus.Taken these two advantages together,a micro-structure and micro-environment dually biomimetic cell-free scaffold was manipulated.This cell-free PCL-MECM scaffold displayed superior biocompatibility and yielded favorable biomechanical capacities closely to native meniscus.Strikingly,neo-menisci were regenerated within PCL-MECM scaffolds which were transplanted into knee joints underwent medial meniscectomy in rabbits and sheep models.Histological staining confirmed neo-menisci showed meniscus-like heterogeneous staining.Mankin scores showed PCL-MECM scaffold could protect articular cartilage well,and knee X-ray examination revealed same results.Knee magnetic resonance imaging(MRI)scanning also showed some neo-menisci in PCL-MECM scaffold group.In conclusion,PCL-MECM scaffold appears to optimize meniscus regeneration.This could represent a promising approach worthy of further investigation in preclinical applications.Weimin Guo Mingxue Chen Zhenyong Wang Yue Tian Jinxuan Zheng Shuang Gao Yangyang Li Yufeng Zheng Xu Li Jingxiang Huang Wei Niu Shuangpeng Jiang Chunxiang Hao Zhiguo Yuan Yu Zhang Mingjie Wang Zehao Wang Jiang Peng Aiyuan Wang Yu Wang Xiang Sui Wenjing Xu Libo Hao Xifu Zheng Shuyun Liu Quanyi Guo 2021Bioactive Materials2021,6,10:1
8Assessment of water-recharging based on ecological features of riparian forest in the lower reaches of Tarim River显示文摘被 mesophytes 种类主要统治的河边的森林的出现和发展与表面水仔细联系。因为到过去的 5 十年年里的 Tarim 河的更低的活动范围没有水分泌物,河边的森林严重地降级。在 2002 和 2003 的 Yingsu, Argan 和 Luobuzhuang 的监视数据的基于的在分析,效果再装 ofwater 被讨论。再装水的工程忽视事实控制在露面,而是对植被的地下水影响的焦点上开拓殖民地于的 Populus euphratica 的过程,这正在泛滥。泛滥的控制背离河边的森林开发的固有的法律,河边的森林的自然新生因此被检查。地下水上的河边的植物的反应范围高举极其狭窄、很河边的社区没被优化。因为 theirphysio 生态的特征被忽略,主导的种类的幼苗都没在充满区域被发现。然而,在溪流的附近的植被变化仅仅在浅地下水上反映 mesophytes 种类的需求为河边的植物的幼苗建立提供合适的产地的 water-re-chargingfails。再装 presentwater 计划是困难的认识到植被恢复。ZHAO Zhenyong WANG Ranghui SUN Hongbo ZHANG Huizhi 2006Chinese Science Bulletin2006,51,A01:1
9The first local case of mpox caused by an imported case in the Chinese mainland显示文摘Monkeypox (mpox) is a zoonotic disease caused by the mpox virus (MPXV) that has been primarily limited to Central and West African nations since its discovery. The recent spread of the West African lineage of MPXV in historically unaffected countries has raised concerns for global public health. Despite a significant decrease in global mpox cases, there is still a risk of a global resurgence. This study reports the first local case of mpox caused by an imported case in the Chinese mainland. Polymerase chain reaction (PCR) diagnosed the two cases, and the viral genomes were obtained by next-generation sequencing. Genomic analysis revealed that the two strains shared an identical genome sequence and belonged to the B.1.3 branch of the West African lineage, which is the first local case of mpox caused by an imported case in the Chinese mainland, highlighting the potential threat of mpox in China and the immediate need for adequate surveillance measures.Daitao Zhang Xiao Qi Fu Li Yanhui Chu Ke Wu Jia Li Xin Meng Xiangfeng Dou Zhenyong Ren Haoyuan Jin Shuang Li Yulan Sun Yanwei Chen Renqing Li Dan Li Weihong Li Yang Yang Yang Pan Wenjie Tan Quanyi Wang 2023Biosafety and Health2023,5,4:1
10Response analysis of shale bedding structure to ultrasonic characteristics and its application显示文摘Based on the wave theory, different bedding structure models for shales in Lower Silurian Longmaxi Formation of southeastern Chongqing area were established, numerical simulations of responses of different bedding structures of shale to ultrasonic wave were carried out by using the second order in time and fourth order in space grid finite difference method, based on the grey system theory, sensitive factors of acoustic parameters of bedding structure were selected, and the dynamic mechanical parameter model of bedded shale was established, which was verified by the ultrasonic transmission experiment results on core down Well ZY1 and YY1 and the logging data of Well ZY2. The results show that:(1) The correlation coefficient between analog and experimental waveforms is greater than 80%, indicating that the numerical simulation method can effectively simulate ultrasonic transmission experiment.(2) Acoustic velocity is a conventional sensitive factor used to characterize shale bedding structure, whereas the attenuation coefficient is sensitive to the change of bedding thickness, with correlation coefficient of 0.89, therefore, using the normalized results of attenuation coefficient to comprehensively describe the shale bedding can make the results more accurate.(3) The correlation between the dynamic and static parameters calculated by the model is better than that of the traditional model; and the predicted values of rock mechanics obtained by using the model and logging data inversion are in good agreement with the experimental values. The research results lay the foundation for further accurate prediction of rock mechanic parameters using sonic logging data.XU Fenglin CHEN Qiao ZHU Honglin WANG Dan CHEN Jilong LIU Pu YAO Guanghua ZHANG Kuo HUO Zhenyong 2019Petroleum Exploration and Development2019,46,1:1
11Impact of climate warming on crop planting and production in Northwest China显示文摘Deng Zhenyong Zhang Qiang Pu Jinyong Liu Dexiang Guo Hui Wang Quanfu Zhao Hong Wang Heling 2008Acta Ecologica Sinica2008,,8:1
12Detecting the One-Shot Dummy Attack on the Power Industrial Control Processes With an Unsupervised Data-Driven Approach显示文摘Dear Editor,Dummy attack(DA), a deep stealthy but impactful data integrity attack on power industrial control processes, is recently recognized as hiding the corrupted measurements in normal measurements. In this letter, targeting a more practical case, we aim to detect the oneshot DA, with the purpose of revealing the DA once it is launched.Specifically, we first formulate an optimization problem to generate one-shot DAs. Then, an unsupervised data-driven approach based on a modified local outlier factor(MLOF) is proposed to detect them.Zhenyong Zhang Yan Qin Jingpei Wang Hui Li Ruilong Deng 2023IEEE/CAA Journal of Automatica Sinica2023,10,2:0
13CoRE:Constrained Robustness Evaluation of Machine Learning-Based Stability Assessment for Power Systems显示文摘Dear Editor,Machine learning(ML) approaches have been widely employed to enable real-time ML-based stability assessment(MLSA) of largescale automated electricity grids. However, the vulnerability of MLSA to malicious cyber-attacks may lead to wrong decisions in operating the physical grid if its resilience properties are not well understood before deployment. Unlike adversarial ML in prior domains such as image processing, specific constraints of power systems that the attacker must obey in constructing adversarial samples require new research on MLSA vulnerability analysis for power systems.Zhenyong Zhang David K.Y.Yau 2023IEEE/CAA Journal of Automatica Sinica2023,10,2:0
14Detection and localization of cyber attacks on water treatment systems:an entropy-based approach显示文摘With the advent of Industry 4.0,water treatment systems(WTSs)are recognized as typical industrial cyber-physical systems(iCPSs)that are connected to the open Internet.Advanced information technology(IT)benefits the WTS in the aspects of reliability,efficiency,and economy.However,the vulnerabilities exposed in the communication and control infrastructure on the cyber side make WTSs prone to cyber attacks.The traditional IT system oriented defense mechanisms cannot be directly applied in safety-critical WTSs because the availability and real-time requirements are of great importance.In this paper,we propose an entropy-based intrusion detection(EBID)method to thwart cyber attacks against widely used controllers(e.g.,programmable logic controllers)in WTSs to address this issue.Because of the varied WTS operating conditions,there is a high false-positive rate with a static threshold for detection.Therefore,we propose a dynamic threshold adjustment mechanism to improve the performance of EBID.To validate the performance of the proposed approaches,we built a high-fidelity WTS testbed with more than 50 measurement points.We conducted experiments under two attack scenarios with a total of 36attacks,showing that the proposed methods achieved a detection rate of 97.22%and a false alarm rate of 1.67%.Ke LIU Mufeng WANG Rongkuan MA Zhenyong ZHANG Qiang WEI 2022Frontiers of Information Technology & Electronic Engineering2022,23,4:0
15Impact Analysis of MTD on the Frequency Stability in Smart Grid显示文摘Dear Editor, In order to accommodate the effects of false data injection attacks(FDIAs), the moving target defense(MTD) strategy is recently proposed to enhance the security of the smart grid by perturbing branch susceptances. However, most pioneer work only focus on the defending performance of MTD in terms of detecting FDIAs and the impact of MTD on the static factors such as the power and economic losses.Zhenyong Zhang Ruilong Deng 2023IEEE/CAA Journal of Automatica Sinica2023,10,1:0
16Influence of high voltage static electric field on ultra-weak chemiluminescence of sheep semen显示文摘Ultra_weak chemiluminescence sent forth by animals’ organs, tissures and cell organs is discussed. It is indicated that if the ultra_weak chemiluminescence of an animal is high, its metabolism is exuberant, and its pregnant rate is high. A study of the influence of ligh voltage static electric field on the luminescence of sheep sperm is carried out.Huang Zhenyong Gao Shaorong Zhang Zhongcheng 1998Chinese Science Bulletin1998,43,4:0
17Synergy of lead vacancies and morphotropic phase boundary to promote high piezoelectricity and temperature stability of PBZTN ceramics显示文摘The flourishing development of emerging electromechanical applications has stimulated an urgent demand for ferroelectric ceramics with high piezoelectric properties and broad temperature usage range.However,it remains a challenge to simultaneously obtain good piezoelectricity and reliable temperature stability in lead zirconate titanate(PZT)-based piezoelectric ceramics.To solve this issue,a synergetic strategy was proposed to introduce lead vacancies through niobium doping and construct morphotropic phase boundary(MPB).In this work,Pb_(0.905)Ba_(0.085)(V Pb″)_(0.01)[(Zr_(x)Ti_(1-x))_(0.98)Nb_(0.02)]O_(3)(PBZTN-x)material system was designed.Good comprehensive properties(d_(33)=864 pC/N,k_(p)=84%,T_(C)=201℃)and excellent temperature stability(less than 10%variation of electrical properties from 20℃ to 160℃)were obtained in PBZTN-0.540 ceramics.Good piezoelectricity can be attributed to high extrinsic contribution(domain wall motion)induced by Pb^(2+)vacancies and the existence of nano-domains emerged at MPB,while excellent temperature stability is mainly attributed to the minimized local stress in the lattice and the stable domain structure.Wenbin Liu Ting Zheng Xuezheng Ruan Zhenyong Man Haoyue Xue Laiming Jiang Fuping Zhang Guorong Li Jiagang Wu 2023Journal of Materials Science & Technology2023,,6:0
18A New Post-hoc Flat Field Measurement Method for the Solar X-Ray and Extreme Ultraviolet Imager Onboard the FengYun-3E Satellite显示文摘Extreme ultraviolet(EUV)observations are widely used in solar activity research and space weather forecasting since they can observe both the solar eruptions and the source regions of the solar wind.Flat field processing is indispensable to remove the instrumental non-uniformity of a solar EUV imager in producing high-quality scientific data from original observed data.FengYun-3E(FY-3E)is a meteorological satellite operated in a Sunsynchronous orbit,and the routine EUV imaging data from the Solar X-ray and Extreme Ultraviolet Imager(X-EUVI)onboard FY-3E has the characteristic of concentric rotation.Taking advantage of the concentric rotation,we propose a post-hoc flat field measurement method for its EUV 195A channel in this paper.This method removes the small-scale and time-varying component of coronal activities by taking the median value for each pixel along the time axis of a concentric rotation data cube,and then derives the large-scale and invariable component of the quiet coronal radiation,and finally generates a flat field image.The flat field can be generated with cadences from hundreds of minutes(one orbit)to several days.Higher flat field accuracy can be achieved by employing more data.Further analysis shows that our method is able to measure the instrumental spot-like nonuniformity possibly caused by contamination on the detector,which mostly disappears after the in-orbit selfcleaning process.It can also measure the quasi-periodic grid-like non-uniformity,possibly from the obscuration of the support mesh on the rear filter.After flat field correction,these instrumental non-uniformities from the original data are effectively removed.Moreover,the X-EUVI 195A data after dark and flat field corrections are consistent with the 193A imaging data from the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory,verifying the suitability of the method.The post-hoc method does not occupy observation time,which is advantageous for space weather operations.Our method is not only suitable for FY-3E/X-EUVI but also a candidate method for the flat field measurement of future solar EUV telescopes.Qiao Song Xianyong Bai Bo Chen Xiuqing Hu Yajie Chen Zhenyong Hou Xiaofan Zhang Lingping He Kefei Song Peng Zhang Jing-Song Wang Xiaoxin Zhang Weiguo Zong Jinping Dun Hui Tian Yuanyong Deng 2022Research in Astronomy and Astrophysics2022,22,10:0
19Application of Ultrasonic Measurement Technology in Breeding of Beef Cattle and Its Evaluation before Slaughtering显示文摘The live cattle eye muscle area,back-fat thickness,height of eye muscle and intramuscular fat content were determined by ultrasonic technology. The prediction model for meat production performance was established. The numerical value had high reliability and accuracy,which reached extremely significant difference via analysis of variance. The study provides scientific basis for breeding and meat evaluation of beef cattle.Zhang Yang Yan Xiangmin Zhou Zhenyong Zhang Jinshan Li Hongbo Li Na Yuan Lixing 2015Animal Husbandry and Feed Science2015,7,2:0
20Identification of Important FPGA Modules Based on Complex Network显示文摘The globalization of hardware designs and supply chains,as well as the integration of third-party intellectual property(IP)cores,has led to an increased focus from malicious attackers on computing hardware.However,existing defense or detection approaches often require additional circuitry to perform security verification,and are thus constrained by time and resource limitations.Considering the scale of actual engineering tasks and tight project schedules,it is usually difficult to implement designs for all modules in field programmable gate array(FPGA)circuits.Some studies have pointed out that the failure of key modules tends to cause greater damage to the network.Therefore,under limited conditions,priority protection designs need to be made on key modules to improve protection efficiency.We have conducted research on FPGA designs including single FPGA systems and multi-FPGA systems,to identify key modules in FPGA systems.For the single FPGA designs,considering the topological structure,network characteristics,and directionality of FPGA designs,we propose a node importance evaluationmethod based on the technique for order preference by similarity to an ideal solution(TOPSIS)method.Then,for the multi-FPGA designs,considering the influence of nodes in intra-layer and inter-layers,they are constructed into the interdependent network,and we propose a method based on connection strength to identify the important modules.Finally,we conduct empirical research using actual FPGA designs as examples.The results indicate that compared to other traditional indexes,node importance indexes proposed for different designs can better characterize the importance of nodes.Senjie Zhang Jinbo Wang Shan Zhou Jingpei Wang Zhenyong Zhang Ruixue Wang 2024Computers, Materials & Continua2024,78,1:0
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