维普中文期刊产品整合服务
33篇 您的检索式:作者名="Zhao Guozhen"
    题名 作者 年代 出处 被引量
1A computational cognition model of perception,memory,and judgment显示文摘The mechanism of human cognition and its computability provide an important theoretical foundation to intelligent computation of visual media.This paper focuses on the intelligent processing of massive data of visual media and its corresponding processes of perception,memory,and judgment in cognition.In particular,both the human cognitive mechanism and cognitive computability of visual media are investigated in this paper at the following three levels:neurophysiology,cognitive psychology,and computational modeling.A computational cognition model of Perception,Memory,and Judgment(PMJ model for short)is proposed,which consists of three stages and three pathways by integrating the cognitive mechanism and computability aspects in a unified framework.Finally,this paper illustrates the applications of the proposed PMJ model in five visual media research areas.As demonstrated by these applications,the PMJ model sheds some light on the intelligent processing of visual media,and it would be innovative for researchers to apply human cognitive mechanism to computer science.FU XiaoLan CAI LianHong LIU Ye JIA Jia CHEN WenFeng YI Zhang ZHAO GuoZhen LIU YongJin WU ChangXu 2014Science China(Information Sciences)2014,57,3:10
2Roadway deformation during riding mining in soft rock显示文摘'Riding mining' is a form of mining where the working face is located above the roadway and advances parallel to it.Riding mining in deep soft rock creates a particular set of problems in the roadway that include high stresses,large deformations,and support difficulties.Herein we describe a study of the rock deformation mechanism of a roadway as observed during riding mining in deep soft rock.Theoretical analysis,numerical simulations,and on site monitoring were used to examine this problem.The stress in the rock and the visco-elastic behavior of the rock are considered.Real time data,recorded over a period of 240 days,were taken from a 750 transportation roadway.Stress distributions in the rock surrounding the roadway were studied by comparing simulations to observations from the mine.The rock stress shows dynamic behavior as the working face advances.The pressure increases and then drops after peaking as the face advances.Both elastic and plastic deformation of the surrounding rock occurs.Plastic deformation provides a mechanism by which stress in the rock relaxes due to material flow.A way to rehabilitate the roadway is suggested that will help ensure mine safety.Zhao Guozhen Ma Zhanguo Zhu Qinghua Mao Xianbiao Feng Meimei 2012International Journal of Mining Science and Technology2012,22,4:7
3Transcriptional Characteristics of Xa21-mediated Defense Responses in Rice显示文摘细菌的老家,由 Xanthomonas oryzae pv 引起了。oryzae (Xoo ) ,是米饭的最破坏的细菌的疾病。克隆的米饭基因 Xa21 授与抵抗到许多 Xoo 赛跑。为了识别基因,在 调停Xa21 的免疫包含了,米饭的整个染色体的 oligonucleotide microarray 被用来在 0 点介绍在不兼容的相互作用和嘲笑处理之间的米饭基因的表示, 4 , 8 , 24 , 72 和 120 h 柱子接种( hpi )或在在 4 hpi 的不兼容、兼容的相互作用之间分别地。441 差别的一个总数表示了基因,指定了为 XDG (Xa21 调停了差别表示了基因) ,被识别。基于他们的功能的注解, XDG 被分到 14 个范畴,包括防卫相关,发信号, transcriptional 管理者。大多数防卫相关的基因属于致病相关的基因家庭,它在 72 和 120 hpi 戏剧性地被导致。有趣地,大多数发信号和 transcriptional 管理者基因是在 4 和 8 hpi 的 downregulated,建议细胞的发信号的那条否定规定可以起在调停 Xa21 的防卫反应的一个作用。在 Xa21- 和其它 R 调停基因的防卫系统之间的表示侧面的比较揭示了有趣的普通回答。有支持证据的代表性的 XDG 也被讨论。Qiang Gan Hui Bai Xianfeng Zhao Yong Tao Haipan Zeng Yuning Han Wenyuan Song Lihuang Zhu Guozhen Liu 2011Journal of Integrative Plant Biology2011,53,4:5
4An analytic solution describing the visco-elastic deformation of coal pillars in room and pillar mine显示文摘Coal pillar deformation is typically nonlinear and time-dependent. The accurate prediction of this defor- mation has a vital importance for the successful implementation of mining techniques. These methods have proven very important as a way to excavate coal resources from under buildings, railways, or water bodies. Elastic and visco-elastic theory are employed with a Maxwell model to formulate an analytic solution for displacement of coal pillars in room and pillar mine. These results show that the visco-elastic solution adequately predicts the coal pillar deformation over time. We conclude that the visco-elastic solution can predict the coal pillar and roadway displacement from the measured geological parameters of the conditions in situ. Furthermore, this method would be useful for mine design, coal pillar support optimization, ground subsidence prediction, and coal pillar stability analysis.Li Qiang XU Hui BU Wankui Zhao Guozhen 2011Mining Science and Technology2011,21,6:5
5Transition-Metal-Free TEMPO Catalyzed Aerobic Oxidation of Alcohols to Carbonyls Using an Efficient Br2 Equivalent under Mild Conditions显示文摘有效 transition-metal-free 催化系统为白酒的氧气的氧化被开发。使用溴化物使与臬化合联合, H2SO4,和 NaNO2 的催化数量,和面对空气的 2,2,6,6-tetramethylpiperidine N-oxyl 基(速度) ,各种各样的白酒能被变换成相应的醛或酉同类在对在温和条件下面的优秀孤立的收益好。Jie Zhang Zengqiang Jiang Dan Zhao Guozhen He Shuangli Zhou Shiqing Han 2013Chinese Journal of Chemistry2013,31,6:4
6Nanosecond photoelectric effects in all-oxide p-n junction of La_(0.9)Sr_(0.1)MnO_(3)/SrNb_(0.01)Ti_(0.99)O_(3)显示文摘Nanosecond (ns) photoelectric effects have been observed in all-oxide p-n junctions of La0.9Sr0.1MnO3/SrNb0.01Ti0.99O3 for the first time. The rise time was about 23 ns and the full width at half maximum was about 125 ns for the open-circuit photovoltaic pulse when the La0.9Sr0.1MnO3 thin film in the p-n junction was irradiated by a laser of ~20 ns pulse duration and 308 nm wavelength. The photovoltaic sensitivity was 80 mV/mJ for a 308 nm laser pulse.HUANG Yanhong L(U) Huibin HE Meng ZHAO Kun CHEN Zhenghao CHENG Bolin ZHOU Yueliang JIN Kuijuan DAI Shouyu YANG Guozhen 2005Science China(Physics,Mechanics & Astronomy)2005,48,3:4
7An Aware-Scheduling Security Architecture with Priority-Equal Multi-Controller for SDN显示文摘Current SDN controllers suffer from a series of potential attacks. For example, malicious flow rules may lead to system disorder by introducing unexpected flow entries. In this paper, we propose Mcad-SA, an aware decision-making security architecture with multiple controllers, which could coordinate heterogeneous controllers internally as a 'big' controller. This architecture includes an additional plane, the scheduling plane, which consists of transponder, sensor, decider and scheduler. Meanwhile it achieves the functions of communicating, supervising and scheduling between data and control plane. In this framework, we adopt the vote results from the majority of controllers to determine valid flow rules distributed to switches. Besides, an aware dynamic scheduling(ADS) mechanism is devised in scheduler to intensify security of Mcad-SA further. Combined with perception, ADS takes advantage of heterogeneity and redundancy of controllers to enable the control plane operate in a dynamic, reliable and unsteady state, which results in significant difficulty of probing systems and executing attacks. Simulation results demonstrate the proposed methods indicate better security resilience over traditional architectures as they have lower failure probability when facing attacks.Chao Qi Jiangxing Wu Guozhen Cheng Jianjian Ai Shuo Zhao 2017China Communications2017,14,9:4
8Community-level trait responses and intra-specific trait variability play important roles in driving community productivity in an alpine meadow on the Tibetan Plateau显示文摘Aims Human activities have dramatically increased nutrient inputs to ecosys-tems,impacting plant community diversity,composition and function-ing.Extensive research has shown that a decrease in species diversity and an increase in productivity are a common phenomenon following fertilization in grasslands ecosystem.The magnitude of the response of species diversity and above-ground net primary productivity(ANPP)to fertilization mainly depends on species traits(mean trait values)and traits variability(plasticity).Our aim of this study was to examine(i)changes of species diversity(species richness and Shannon-Wiener index)and ANPP following fertilization;(ii)which species traits or community-weighted mean(CWM)traits can determine ANPP,as expected from the‘biomass ratio hypothesis’;and(iii)the relative role of intra-specific and inter-specific trait variability in this process following fertilization.Methods We measured ANPP and four key plant functional traits:specific leaf area(SLA),leaf dry matter content(LDMC),mature plant height(MPH)and leaf nitrogen concentration(LNC)for 25 component species along a fertilization gradient in an alpine meadow on the Tibetan Plateau.In addition,trait variation of species was assessed using coefficients of variation(CV),and we calculated the ratio of the CVintra to the CVinter.Important Findings Our results showed that:(i)fertilization significantly reduced species richness and Shannon-Weiner diversity index,but sig-nificantly increased ANPP;(ii)there was a significant positive correlation between ANPP and CWM-SLA and CWM-MPH,yet there was no significant relationship between ANPP and CWM-LNC or CWM-LDMC;(iii)intra-specific variability in SLA and MPH was found to be much greater than inter-specific variability,especially at the higher fertilization levels.We con-cluded that CWM-SLA and CWM-MPH can be used to assess the impacts of species changes on ecosystem functioning,and dominant species can maximize resource use through intra-spe-cific variability in SLA and MPH to compensate for the loss of species following fertilization,therefore maintaining high com-munity productivity.Wei Li Jie Zhao Howard E.Epstein Guanghua Jing Jimin Cheng Guozhen Du 2017Journal of Plant Ecology2017,10,4:3
9A study on surface symmetry and interfacial enhancement of SrTiO_3 by second harmonic generation显示文摘The symmetry of the surfaces of SrTiO3and slightly Nb-doped SrTiO3crystals was investigated by the optical reflected second harmonic generation technique.The good agreement between experimental and theoretical results of the second harmonic intensity dependence on the azimuth angle indicates that the SrTiO3(001)surface is with 4mm symmetry and the Nb-doped SrTiO3(111)surface with 3m symmetry.The measurements of the polarization dependent second harmonic intensity confirm that conclusion.The enhancement of the surface polarization in the structure of SrTiO3capped La0.9Sr0.1MnO3films compared with that in the La0.9Sr0.1MnO3films has been obtained.ZHAO RuiQiang JIN KuiJuan GUO HaiZhong LU HuiBin YANG GuoZhen 2013Science China(Physics,Mechanics & Astronomy)2013,56,12:3
10Effect of electroacpuncture of Neiguan(PC 6)and Tianquan(PC 2)on skin temperature,blood perfusion,and adrenoceptor response in rats with acute myocardial ischemia显示文摘OBJECTIVE: To investigate the effect of electroacupuncture(EA) of acupoints Neiguan(PC 6) and Tianquan(PC 2) on the skin temperature, blood perfusion, and alpha1-and beta2-adrenoreceptor(α1-AR and β2-AR) protein and m RNA level in rats with acute myocardial ischemia.METHODS: Thirty male adult Wistar rats [(230 ±20) g] were randomly assigned into five groups(n = 6 each): a control group, sham operation group, model group, model group treated with EA at low frequency(L-EA, 2 Hz, 1 m A) and model group treated with EA at high frequency(H-EA, 100 Hz, 1 m A). The rat model was prepared by ligating the left anterior descending coronary artery. Electroacupuncture was performed at the left Neiguan(PC 6) for 20 min daily for 3 d. After the 3 rd time of the treatment, measurements of skin blood perfusion and temperature in Neiguan(PC 6) and Tianquan(PC 2) in all groups were made by laser speckle contrast imaging and infrared thermal image instrument. Real-time PCR and ELISA were used to measure m RNA level and protein level of α1-AR andβ2-AR in the skin tissues of Neiguan(PC 6) and Tianquan(PC 2), respectively. Serum levels of c Tn T and electrocardiogram were used to identify the state of myocardium.RESULTS: In the group receiving electroacupunture at Neiguan(PC 6), compared with control group,the skin temperature, blood perfusion, and β2-AR m RNA and protein level of model group significantly decreased(P < 0.05), α1-AR m RNA and protein level of model group significantly increased(P < 0.05);compared with model group, the skin temperature,blood perfusion, and β2-AR m RNA and protein level of L-EA significantly increased(P < 0.05), α1-AR m RNA and protein level of L-EA and H-EA significantly decreased(P < 0.05). The same trend has taken place in the former four groups of the Tianquan(PC 2).CONCLUSION: Low-or high-frequency electroacupuncture can improve the skin temperature and blood perfusion which may be induced by decreasingthelevelofα1-ARandincreasingthelevelofβ2-AR of the Neiguan(PC 6) and Tianquan(PC 2) in the rat with acute myocaidial ischemia.Wang Dan Ji Bo Zhao Guozhen Yan Mingna Bai Hongxin Sun Xiaomin Dai Jian Lu Yawen Liu Yitian You Min Wu Jiaojuan Ge Yunpeng Su Hang Cheng Kai 2017Journal of Traditional Chinese Medicine2017,37,6:3
11Effect of thermal pretreatment on the surface structure of PtSn/SiO2 catalyst and its performance in acetic acid hydrogenation显示文摘活跃地点和在醋酸(AcOH ) 的 PtSn/SiO 2 催化剂的催化表演上的热预告的处理的效果加氢在这篇文章被调查。催化剂被 N 2 描绘物理吸附, X 光检查衍射,传播电子显微镜学, pyridine Fourier 变换红外线的系列,和它的物理化学的性质上的 H 2-O2 滴定。结果证明那磅种首先在水晶的结构被形成,没有 PtSn x 合金被观察。与热预告的处理温度的增长,同时,磅分散由于磅粒子的聚集显示出一个减少的趋势。同时,路易斯酸地点的数量被拥有到 Sn 种类的作为结果的物理化学的性质变化的如此的热预告的处理显著地影响。有趣地,催化活动与路易斯酸地点的显示出类似的变化趋势,证实在 AcOH 加氢的路易斯酸地点的重要角色。而且,在暴露的磅和路易斯酸地点之间的平衡效果被获得,在 AcOH 加氢导致优异催化表演。Guozhen Xu Jian Zhang Shengping Wang Yujun Zhao Xinbin Ma 2016Frontiers of Chemical Science and Engineering2016,10,3:2
12Recent advanced applications of ion-gel in ionic-gated transistor显示文摘Diversified regulation of electrons have received much attention to realize a multi-functional transistor,and it is crucial to have a considerable control over the charge carriers in transistors.Ionic gel,as the dielectric material in transistors,facilitates a large capacitance,and high induced-carrier concentrations.This review presents the recent progress in ionic-gated transistors(IGTs)that have good mechanical stability as well as high physical and chemical stability.We first briefly introduce the various applications of IGTs in sensors,neuromorphic transistors,organic transistor circuits,and health detection.Finally,the future perspectives of IGTs are discussed and some possible solutions to the challenges are also proposed.Depeng Wang Shufang Zhao Ruiyang Yin Linlin Li Zheng Lou Guozhen Shen 2021npj Flexible Electronics2021,5,1:2
13Graft copolymerization of methyl methacrylate on stone ground wood using the H2O2-Fe2+ method显示文摘 Bianan Zhao Guozhen Zheng 1992J Appl Polym Sci1992,45,:1
14Neuromorphic-computing-based adaptive learning using ion dynamics in flexible energy storage devices显示文摘High-accuracy neuromorphic devices with adaptive weight adjustment are crucial for high-performance computing.However,limited studies have been conducted on achieving selective and linear synaptic weight updates without changing electrical pulses.Herein,we propose high-accuracy and self-adaptive artificial synapses based on tunable and flexible MXene energy storage devices.These synapses can be adjusted adaptively depending on the stored weight value to mitigate time and energy loss resulting from recalculation.The resistance can be used to effectively regulate the accumulation and dissipation of ions in single devices,without changing the external pulse stimulation or preprogramming,to ensure selective and linear synaptic weight updates.The feasibility of the proposed neural network based on the synapses of flexible energy devices was investigated through training and machine learning.The results indicated that the device achieved a recognition accuracy of~95%for various neural network calculation tasks such as numeric classification.Shufang Zhao Wenhao Ran Zheng Lou Linlin Li Swapnadeep Poddar Lili Wang Zhiyong Fan Guozhen Shen 2022National Science Review2022,9,11:1
15Effect of crude-herb moxibustion on blood lipids in rats with dyslipidemia显示文摘Objective:To evaluate the lipid-regulating effect of crude-herb moxibustion on rats with dyslipidemia.Methods:Fifty-four SpragueeDawley rats were randomly divided into six groups with nine rats each.Control group rats were fed a normal diet,and bilateral acu-point Fenglong(equivalent to ST40 in humans)on the hind legs were covered with a placebo(general mucilage)for 2 hours each day.Model group rats were fed a high-lipid diet for 2 weeks.Therapy group rats were fed a high-lipid diet for 2 weeks and then administered crude-herb moxibustion at ST40 for 2 hours each day for the next 2 weeks.Prevention group rats were administered crude-herb moxibustion 2 hours a day for 2 weeks and then fed a high-lipid diet for the subsequent 2 weeks.Prevention/Therapy group rats were each administered crude-herb moxibustion at ST40 for 2 hours each day for 2 weeks,followed by a high-lipid diet for the next 2 weeks,and then crude-herb moxibustion again at ST40 for another 2 weeks.Simvastatin group rats were fed a high-lipid diet for 2 weeks and then treated with simvastatin for the next 2 weeks.Blood lipids,hepatosomatic indices(HSIs)and epididymal fat pad weights of all rats were examined.Results:Compared with the Model group,levels of total cholesterol(TC),glycerinate,lowdensity lipoprotein cholesterol(LDL-C)and very low-density lipoprotein cholesterol(VLDL-C)in plasma collected from the Therapy group,the Prevention/Therapy group,and the Simvastatin group were decreased.Moreover,compared with the Model group,HSIs in Therapy group rats were also decreased following administration of crude-herb moxibustion,but TC,TG,HDLC,LDL-C,and VLDL-C levels in the Prevention group were higher than those in the Model group.Conclusion:The results reveal that blood lipids and HSIs appear to be modulated by the effect of crude-herb moxibustion and suggest therapeutic strategies for the treatment of dyslipidemia.Lian Duan Guozhen Zhao Bo Ji Yu Cao Xiaohong Chen 2014Journal of Traditional Chinese Medical Sciences2014,1,2:1
16Acrylamide Alters Cytoskeletal Protein Level in Rat Sciatic Nerves显示文摘Sufang Yu Fuyong Son Jinxia Yu Xiulan Zhao Lihua Yu Guozhen Li Keqin Xie 2006Neurochemical Research2006,,10:1
17Interfacial-Strain-Induced Structural and Polarization Evolutions in Epitaxial Multiferroic BiFeO_3(001) Thin Films显示文摘Varying the film thickness is a precise route to tune the interfacial strain to manipulate the properties of the multiferroic materials.Here,to explore the effects of the interfacial strain on the properties of the multiferroic BiFeO_3films,we investigated thickness-dependent structural and polarization evolutions of the BiFeO_3 films.The epitaxial growth with an atomic stacking sequence of BiO/TiO_2 at the interface was confirmed by scanning transmission electron microscopy.Combining X-ray diffraction experiments and first-principles calculations,a thickness-dependent structural evolution was observed from a fully strained tetragonality to a partially relaxed one without any structural phase transition or rotated twins.The tetragonality(c/a) of the BiFeO_3 films increases as the film thickness decreases,while the polarization is in contrast with this trend,and the size effect including the depolarization field plays a crucial role in this contradiction in thinner films.These findings offer an alternative strategy to manipulate structural and polarization properties by tuning the interfacial strain in epitaxial multiferroic thin films.郭海中 Ruiqiang Zhao Kui-juan Jin Lin Gu Dongdong Xiao Zhenzhong Yang Xiaolong Li Le Wang Xu He Junxing Gu Qian Wan Can Wang Huibin Lu Chen Ge Meng He Guozhen Yang 2015功能材料信息2015,12,3:1
18Central sensibility of human cases with different body mass during oral glucose tolerance test using functional magnetic resonance imaging显示文摘BACKGROUND: Because of the limitation of technique, there are few researches on regulating function o central hypothalamus by metabolism, especially the researches on real-time function. OBJECTIVE: To evaluate the response of hypothalamus to oral glucose tolerance test (OGTT) in differen body-weighted subjects by using functional magnetic resonance imaging (fMRI) so as to investigate th relationship between the sensitivity of hypothalamus in glycoregulation and disturbance of carbohydrat metabolism. DESIGN: Paired design. SETTING: Department of Radiology and Beijing Geriatrics Institute, Beijing Hospital, National Publi Health Bureau. PARTICIPANTS: A total of twenty healthy volunteers were selected from Beijing Geriatrics Institute National Public Health Bureau, including 10 subjects with obesity (5 males and 5 females; body mass > 28.0 kg/m2) and 10 subjects with normal body mass (5 males and 5 females; body mass from 18.5 to 23.9 kg/m2). All subjects gave written informed consent before participating in the study. METHODS: fMRI study was performed on GE 1.5 T Signa Twinspeed Infinity with Excite. Each voluntee was ingested of glucose during the fMRI scan. T2* images were acquired using a single-shot gradient echo (EPI) technique. The parameters of EPI included: TR 3 000 ms, TE 40 ms, Flip angle 90°, field of view (FOV) 24 cm × 24 cm, thickness 5 mm, gap 0 mm, matrix 64 × 64, number of excitation 1. All 10 subjects with normal body mass underwent a repeat fMRI scan after consuming an equivalent amount o water without glucose on a separate day. The procedure for the fMRI scan with water intake was the same a for glucose ingestion. fMRI data were processed with Intensity Averaging Method. MAIN OUTCOME MEASURES: The central response of hypothalamus and feedback orientation during OGTT in different body-weighted subjects. RESULTS: An acute transient decrease of fMRI intensity in posterior inferior and anterior inferior o hypothalamus was observed in all subjects within 2 minutes after oral glucose intake. This decrease wa followed by a recovery to the baseline. However, obese subjects had a delayed intensity decrease [(1.96± 1.06) minutes vs. (1.04±0.71) minutes, t =2.14, P < 0.05] and longer recovery time [(26.62±7.35 minutes vs. (16.29±6.42) minutes, t =3.67, P < 0.01] as compared with normal body-weight subjects Furthermore, decreased fMRI intensity was significant different from baseline intensity [(5.7±2.5)% vs (14.3±5.5)%, t =2.56, P < 0.05] in obese subjects, but not in normal body-weight subjects. The area o hypothalamus in normal body-weight volunteers demonstrated no significant signal change before and afte oral water ingestion (P > 0.05). CONCLUSION: Hypothalamus response to glucose loading is different in normal body-weighted and obes subjects. This suggests that fMRI is a useful tool to evaluate the central regulation of glucose metabolism.Min Chen Yunting Zhang Tiemei Zhang Cheng Zhou Xiaomeng Wu Kui Cai Zhenghan Yang Wenchao Wang Weifeng Zhao Saying Li Zhi Wang Guozhen Li 2007Neural Regeneration Research2007,2,9:1
19A comparison of U-bend and slow strain rate procedures for assessing the SCC resistance of type 304 stainless steel in high-temperature water显示文摘Yang Wu Zhang Meijie Zhao Guozhen Congleton John 1991Corrosion1991,47,4:1
20Evaluation of simulated reservoirs by using the oblique-incidence reflectivity difference technique显示文摘Dear Editors,The evaluation of the oil-gas resources’potential depends on the characterization of reservoirs.The geometry of the pore-crack structures and the compositions of the pore walls have influence on hydrocarbon production about capillarity and permeability[1].Besides,it has been known that the adsorption phenomenon in micro-structure plays a significant role in oil-gas reservoirs.Some techniques have been applied to characterize conventional and unconventional reservoirs,Jin Wang HongLei Zhan LiPing He Kun Zhao HuiBin Lü KuiJuan Jin GuoZhen Yang 2016Science China(Physics,Mechanics & Astronomy)2016,59,11:1
返回顶部 每页显示:
共2页 首页 上一页 第1页 下一页 末页 /2 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费