|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Effects of electric parameters on microstructure and properties of MAO coating fabricated on ZK60 Mg alloy in dual electrolyte显示文摘Micro-arc oxidation (MAO) process was carried out in a dual electrolyte system of NaAlO 2 and Na 3 PO 4 on ZK60 Mg alloys to explore the effect of electric parameters including current density, frequency, duty cycle and oxidation time on the evolution of coatings and other characteristics. The microstructural characteristics of coatings were observed by scanning electron microscopy (SEM) combined with the analysis of voltage-time responses during MAO process. Test of weight loss was conducted at a 3.5% NaCl solution to assess the resistance to corrosion. The results indicate that the current density and duty cycle play key roles on the coating quality. The peak voltage during MAO process increased with the increase in current density but the coating would be more easily detached when the current density was beyond a critical value. Voltage during MAO and microstructure of the coating were affected remarkably by duty cycle, and corrosion resistance was improved greatly when duty cycle was 40%. By means of single variable experiments, MAO process with optimized electric parameters was developed, which corresponds to the current density of 20 A dm 2 , frequency of 500 Hz, duty cycle of 40% and oxidation time of 15 min. | Chen, Jing Wang, Zexin Lu, Sheng | 2012 | Rare Metals2012，31，2： | 9 |
| 2 | Analysis of reconstructed annual precipitation from tree-rings for the past 500 years in the middle Qilian Mountain显示文摘The ring-width chronology of a Juniperus przewalskii tree from the middle of the Qilian Mountain was constructed to estimate the annual precipitation (from previous August to current July) since AD 1480.The reconstruction showed four major alternations of drying and wetting over the past 521 years.The rainy 16th century was followed by persistent drought in the 17th century.Moreover,relatively wet conditions persisted from the 18th to the beginning of 20th century until the recurrence of a drought during the 1920s and 1930s.Based on the Empirical Mode Decomposition method,eight Intrinsic Mode Functions (IMFs) were extracted,each representing unique fluctuations of the reconstructed precipitation in the time-frequency domain.The high amplitudes of IMFs on different timescales were often consistent with the high amount of precipitation,and vice versa.The IMF of the lowest frequency indicated that the precipitation has undergone a slow increasing trend over the past 521 years.The 2-3 year and 5-8 year time-scales reflected the characteristics of inter-annual variability in precipitation relevant to regional atmospheric circulation and the El Ni?o-Southern Oscillation (ENSO),respectively.The 10-13 year scale of IMF may be associated with changing solar activity.Specifically,an amalgamation of previous and present data showed that droughts were likely to be a historically persistent feature of the Earth's climate,whereas the probability of intensified rainfall events seemed to increase during the course of the 19th and 20th centuries.These changing characteristics in precipitation indicate an unprecedented alteration of the hydrological cycle,with unknown future amplitude.Our reconstruction complements existing information on past precipitation changes in the Qilian Mountain,and provides additional low-frequency information not previously available. | TIAN QinHua ZHOU XiuJi GOU XiaoHu ZHAO Ping FAN ZeXin Samuli HELAMA | 2012 | Science China Earth Sciences2012，55，5： | 7 |
| 3 | Iterative freeform lens design for optical field control显示文摘It is still very challenging to determine a freeform lens for converting a given input beam into a prescribed output beam where not only the irradiance distribution but also the phase distribution hardly can be expressed analytically.Difficulties arise because the ray mapping from the input beam to the output beam is not only intertwined with the required double freeform surfaces but also intertwined with the output phase distribution,whose gradient represents the directions of the output rays.Direct determination of such a problem is very difficult.Here,we develop a special iterative wavefront tailoring(IWT)method to tackle this problem.In a certain iteration,the current calculation data of the double freeform surfaces and the output phase gradient are used to update the coefficients of a Monge–Ampère equation describing an intermediate wavefront next to the entrance freeform surface.The solution to the wavefront equation could lead to an improved ray mapping to be used to update the corresponding phase gradient data and reconstruct the double freeform surfaces.In a demonstrative example that deviates much from the paraxial or small-angle approximation,the new IWT method can generate a freeform lens that performs much better than that designed by a conventional ray mapping method for producing two irradiance distributions in the forms of numerals'1'and'2'on two successive targets,respectively. | ZEXIN FENG DEWEN CHENG YONGTIAN WANG | 2021 | Photonics Research2021，9，9： | 7 |
| 4 | Formation of the Yalong Downstream Terraces in the SE Tibetan Plateau and Its Implication for the Uplift of the Plateau显示文摘The Yalong River is an important river that runs across the abruptly changing terrain of the SE Tibetan Plateau. The terraces and Quaternary sediments in its valleys preserve the information of tectonic uplift,climate changes,and landform evolution since the Middle Pleistocene. Based on geomorphological,sedimentological,and chronological investigations,6–8 terraces are identified in the lower reaches of Yalong catchment and its tributary—the Anning River. The electron spin resonance(ESR) or optically stimulated luminescence(OSL) data on the alluvial sediments in the upper portion of terraces indicate that they formed in 1.10,0.90,0.72,0.06–0.04,0.03–0.02,and 0.01 Ma. Tectonic uplift and the climatic cycle controlled the formation of the Yalong River terraces. The former dominated the dissection depths and incision rates,whereas the latter controlled the transformation between accumulation,which developed during the glacial period,and incision,which developed during the glacial-interglacial transition. The Yalong downstream incised rapidly from 1.10 to 0.72 Ma and rapidly from 0.06 Ma until the present; the terraces developed during these two periods. The incision rates in space during the two periods indicate the uplifting extent of the Jinpingshan area,which decreases toward the east and the south. The results reveal two rapidly uplifting stages in the SE Tibetan Plateau,including an accelerated uplifting since 0.06 Ma. Since the Middle Pleistocene,the tectonic uplift of the SE and NE parts of the Tibetan Plateau is synchronous,according to the same development stages of the river terraces of the Yalong downstream and the Yellow River in the Lanzhou area of the NE Tibetan Plateau. The difference in the horizontal displacement between the Xianshuihe Fault and the Anninghe Fault bend resulted in the rapid uplift of the Jinpingshan area. The incision rate for the spatial distribution of the Yalong downstream is the geomorphological response of crustal shortening and uplift differences in the SE margin block of the Tibetan Plateau. The southeastward diffusion process of the Tibetan Plateau was recorded. | HE Zexin ZHANG Xujiao QIAO Yansong BAO Shuyan LU Chunyu HE Xiangli | 2015 | Acta Geologica Sinica(English Edition)2015，89，2： | 4 |
| 5 | In-situ surface decoration of RuO_(2) nanoparticles by laser ablation for improved oxygen evolution reaction activity in both acid and alkali solutions显示文摘Improving the OER activity of noble metal-based materials is of profound importance to minimize the usage of noble metals and lower the cost.Here,we report considerable improvement on the catalytic activity of RuO_(2) particles for OER in both alkali and acid environments.The RuO_(2) nanoparticles were treated with a method of pulse laser ablation.Numerous Ru and RuO_(2) clusters were generated at the surface of RuO_(2) nanoparticles after the laser ablation,forming a lychee-shaped morphology.The larger pulse energy RuO_(2) nanoparticles are treated with,the better the OER activity can be.DFT calculations shows that the surface tension induced by the lychee-shaped morphology benefits the OER performance.Our best sample gives an overpotential of 172 mV(at 10 mA cm^(-2))and a Tafel slope of 53.5 mV dec^(-1) in KOH,while an overpotential of 219 mV and a Tafel slope of 44.9 mV dec^(-1) in H_(2)SO_(4),which are of topclass results.This work may inspire a new way to develop high-performance electrocatalysts for OER. | Zongpeng Wang Beibei Xiao Zhiping Lin Shijie Shen Aijiao Xu Zexin Du Yuchao Chen Wenwu Zhong | 2021 | Journal of Energy Chemistry2021，30，3： | 4 |
| 6 | Andrographolide and Its Derivative Potassium Dehydrographolide Succinate Suppress PRRSV Replication in Primary and Established Cells via Differential Mechanisms of Action显示文摘Porcine reproductive and respiratory syndrome virus(PRRSV) continues to cause significant economic loss worldwide and remains a serious threat to the pork industry. Currently, vaccination strategies provide limited protection against PRRSV infection, and consequently, new antiviral strategies are urgently required. Andrographolide(Andro) and its derivative potassium dehydrographolide succinate(PDS) have been used clinically in China and other Asian countries as therapies for inflammation-related diseases, including bacterial and viral infections, for decades. Here, we demonstrate that Andro and PDS exhibit robust activity against PRRSV replication in Marc-145 cells and primary porcine alveolar macrophages(PAMs). The two compounds exhibited broad-spectrum inhibitory activities in vitro against clinically circulating type 2 PRRSV GD-HD, XH-GD, and NADC30-like HNhx strains in China. The EC_(50)values of Andro against three tested PRRSV strain infections in Marc-145 cells ranged from 11.7 to 15.3 lmol/L, with selectivity indexes ranging from 8.3 to10.8, while the EC_(50)values of PDS ranged from 57.1 to 85.4 lmol/L, with selectivity indexes ranging from 344 to 515.Mechanistically, the anti-PRRSV activity of the two compounds is closely associated with their potent suppression on NFj B activation and enhanced oxidative stress induced by PRRSV infection. Further mechanistic investigations revealed that PDS, but not Andro, is able to directly interact with PRRSV particles. Taken together, our findings suggest that Andro and PDS are promising PRRSV inhibitors in vitro and deserves further in vivo studies in swine. | Lizhan Su Yarou Gao Mingxin Zhang Zexin Liu Qisheng Lin Lang Gong Jianying Guo Lixia Chen Tongqing An Jianxin Chen | 2021 | Virologica Sinica2021，36，6： | 4 |
| 7 | Hierarchical protection control system of smart substations显示文摘This paper analyzes the problems of the relay protections and secondary circuits of traditional substations,and introduces the hierarchical protection and control system of smart substations based on the technologies like IEC 61850 Standard,electronic instrument transformer,process level network,and wide area optical fiber communication network,etc.The hierarchical protection and control system includes three levels:local area protection,substation area protection and control,and wide area protection and control.These three levels are combined to solve the problems of the relay protections in traditional substations,thus improving protection performance and control capability of the system. | Yuping ZHENG Delin WANG Zexin ZHOU Tuanjie CAO | 2014 | Journal of Modern Power Systems and Clean Energy2014，2，3： | 3 |
| 8 | Associations of noniodized salt and thyroid nodule among the Chinese population: a large cross-sectional study1234显示文摘 | Zexin Chen Weimin Xu Yangmei Huang Xingyi Jin Jin Deng Sujuan Zhu Hui Liu Shanchun Zhang Yunxian Yu | 2013 | American Journal of Clinical Nutrition2013，，3： | 3 |
| 9 | Intensification of the East Asian Monsoon in Southern China at about300-400 kaBP Inferred from Eolian Deposits in the Middle-lower Reaches of the Yangtze River显示文摘In the East Asian monsoon region,eolian deposits widely distributed in the middle-lower reaches of the Yantgze River are among the best materials available for studies on Quaternary climate change in the subtropical zone of Southern China.Typical eolian deposits in this region include upper Xiashu Loess(XL) and underlying Vermiculated Red Soil(VRS) layers.In this paper,chronological and paleoclimatic studies are conducted on an eolian deposit sequence near Jiujiang(JJ) city in northern Jiangxi province.A magnetostratigraphic study,combined with optically stimulated luminescence(OSL) dating,is conducted on the JJ section and provides further evidence that eolian deposits in the middle-lower reaches of the Yangtze River have been formed since the late Early Pleistocene,and that the boundary age between the XL and VRS layers is about 300-400 kaBP.In grain-size records of the JJ section,the median grain-size and content of the >30 μm size fraction increase sharply after 300-400 kaBP,representing an East Asian winter monsoon intensification event.Further pollen analysis reveals differing pollen assemblages before and after 300-400 kaBP:there is an evident increase in plants adapted to grow in a warm humid environment after 300-400 kaBP,implying an increase in precipitation caused by intensification of the East Asian summer monsoon.Global ice volume and uplift of the Tibet Plateau(TP) are regarded as crucial factors influencing variations of the East Asian monsoon on a long-term scale.The deep-sea δ^(18)O record,which reflects variations in global ice volume,shows no obvious change after 300-400 kaBP.Moreover,the influence of global ice volume changes on the East Asian summer and winter monsoons is inverse;the global ice volume increase(decrease) implies a strengthened(weakened) winter monsoon and weakened(strengthened) summer monsoon.We therefore interpret the coupled intensifications of the East Asian summer and winter monsoons at about 300-400 kaBP to the uplift of the TP in the Middle Pleistocene.This climate event is also documented in eolian deposits from the southern margin of the Chinese Loess Plateau(CLP) and from the desert-loess transitional belt.However,it is not recorded in the loess-paleosol sequences from the central part of the CLP,thereby indicating differing climate responses to TP uplift in different regions,which requires further study. | QI Lin QIAO Yansong LI Yuehui WANG Yan PENG Shasha HE Zexin YANG Shuaibin HAN Chao ZHANG Xujiao | 2017 | Acta Geologica Sinica(English Edition)2017，91，3： | 3 |
| 10 | Iterative freeform lens design for prescribed irradiance on curved target显示文摘Current freeform illumination optical designs are mostly focused on producing prescribed irradiance distributions on planar targets.Here,we aim to design freeform optics that could generate a desired illumination on a curved target from a point source,which is still a challenge.We reduce the difficulties that arise from the curved target by involving its varying z-coordinates in the iterative wavefront tailoring(IWT)procedure.The new IWT-based method is developed under the stereographic coordinate system with a special mesh transformation of the source domain,which is suitable for light sources with light emissions in semi space such as LED sources.The first example demonstrates that a rectangular flat-top illumination can be generated on an undulating surface by a spherical-freeform lens for a Lambertian source.The second example shows that our method is also applicable for producing a non-uniform irradiance distribution in a circular region of the undulating surface. | Zexin Feng Dewen Cheng Yongtian Wang | 2020 | Opto-Electronic Advances2020，3，7： | 2 |
| 11 | Multi-objective Optimization Design of Inset-surface Permanent Magnet Machine Considering Deterministic and Robust Performances显示文摘The inset-surface permanent magnet(ISPM)machine can achieve the desired electromagnetic performance according to the traditional deterministic design.However,the reliability and quality of the machine may be affected by the essential manufacturing tolerances and unavoidable noise factors in mass production.To address this weakness,a comprehensive multi-objective optimization design method is proposed,in which robust optimization is performed after the deterministic design.The response surface method is first adopted to establish the optimization objective equation.Afterward,the sample points are obtained via Monte Carlo simulation considering the design-variable uncertainty.The Design for Six Sigma approach is adopted to ensure the robustness of the design model.Furthermore,the barebones multi-objective particle swarm optimization algorithm is used to obtain a compromise solution.A prototype is manufactured to evaluate the effectiveness of the proposed method.According to the finite-element analysis and experimental tests,the electromagnetic performance and reliability of the machine are significantly enhanced with the proposed method. | Gaohong Xu Zexin Jia Wenxiang Zhao Qian Chen Guohai Liu | 2021 | Chinese Journal of Electrical Engineering2021，7，3： | 2 |
| 12 | Preparation of Palygorskite-based Phase Change Composites for Thermal Energy Storage and Their Applications in Trombe Walls显示文摘Palygorskite/paraffin phase-change composites were prepared by the combination of purified palygorskite clay and sliced paraffin. Then, this composite was used in the Trombe wall to improve its energy storage ability. Further, its energy storage ability was compared to that of ordinary concrete wall through contrastive test. The experiments show that palygorskite clay is a type of clay mineral with strong adsorption ability, and the purity of natural palygorskite clay can reach up to 97.1% after certain purification processes. Paraffin is well adsorbed by palygorskite, and the test results show that the optimal adsorption ratio is palygorskite: paraffin = 2:1(mass ratio). Palygorskite/paraffin phase change composites can be obtained by using palygorskite as the adsorbing medium to adsorb paraffin. The composite materials exhibit good heat storage(release) performance, which can store heat with increasing environment temperature and release heat with decreasing temperature. This property not only increases the inertia to environment temperature change, but also promotes the energy migration in different time and space, thus achieving a certain energy-saving effect. The application of palygorskite/paraffin phase change composite materials to the Trombe wall can significantly reduce the fluctuation of indoor temperature and enhance the thermal inertia of indoor environment. From the aspect of energy storage effect, the Trombe wall fabricated using PCMs is significantly superior to the concrete wall with the same thickness. | 施韬 LI Shanshan 张豪 LI Zexin ZHU Min | 2017 | Journal of Wuhan University of Technology(Materials Science)2017，32，6： | 2 |
| 13 | 多孔硅质岩的试验研究显示文摘通过试验分析了多孔硅质岩的化学成分,微区结构状态,火山灰性检验以及不同细度、不同掺量的多孔硅质岩掺入到水泥中对水泥试件各龄期强度的影响.认为多孔硅质岩矿粉是一种天然活性混合材料,掺入水泥中可提高水泥的强度,在此基础上可作进一步研究开发. | Yan Zexin(Dept.of Urban Construction & Management) | 1997 | 武汉城市建设学院学报1997，14，4： | 2 |
| 14 | Research on the Impact of Distributed Generation on Relay Protection and Its Standards显示文摘Distributed generation(DG) will change characteristics of power flow and faults of traditional distribution network as well as the network operation mode, especially the operation of relay protection and automatic circuit breaker re-closing. In this paper, the characteristics and influences of several types of distributed generation and connection pattern, relay protection and automatic circuit breaker re-closing are analyzed. Standards of relay protection when distributed generation access to distribution network are discussed as well. | Yang Guosheng Zhou Zexin Li Wei Liu Yu Liu Yadong Wang Xiaoyang Wang Wenhuan | 2014 | Electricity2014，25，5： | 2 |
| 15 | Two vs three cycles of neoadjuvant sintilimab plus chemotherapy for resectable non-small-cell lung cancer:neoSCORE trial显示文摘Dear Editor,Lung cancer is the predominant cause of cancer-related deaths globally,with non-small cell lung cancer(NSCLC)accounting for 85%of all cases.1 The five-year overall survival(OS)after surgery remains poor because of the high rate of postoperative recurrence and metastasis.Recently,immune checkpoint inhibitors(ICIs)have shown promising efficacy in resectable NSCLC. | Miner Shao Jie Yao Yunke Wang Lufeng Zhao Baizhou Li Lili Li Zuqun Wu Zexin Chen Junqiang Fan Fuming Qiu | 2023 | Signal Transduction and Targeted Therapy2023，8，5： | 1 |
| 16 | Structural optimization of 2-D array probe for ACFM显示文摘 | CHEN Guoming LI Wei WANG Zexin | 2007 | NDT&E International2007，40，6： | 1 |
| 17 | Associations of uoniodized salt and thyroid nodule among the Chinese population: a large cross- sectional study显示文摘 | Zexin Chen Weimin xu Yangmei Huang | 2013 | The American Journal of Clinical Nutrition2013，98，： | 1 |
| 18 | Seroprevalence of Coxsackievirus B3 in Yantai,China显示文摘 | Zexin Tao Bo Li Aiqiang Xu | 2013 | Japanese joural of infectious Diseases2013，66，6： | 1 |
| 19 | Structural optimazation of 2-D array probe for alternaing current field measurement显示文摘 | Chen Guoming Li Wei Wang Zexin | 2007 | NDT&E International2007，40，6： | 1 |
| 20 | Design of compact and smooth free-form optical system with uniform illuminance for LED source显示文摘 | Luo Yi Feng Zexin Han Yanjun | 2010 | Optics Express2010，18，9： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员