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| 1 | Finite element analysis and optimization of temperature field in GaN-MOCVD reactor显示文摘The electromagnetic field distribution of the in-home GaN-MOCVD reactor heated by induction was simulated by using finite element method (FEM), and the distributions of the magnetic field and the joule heat in the graphite susceptor were obtained. Then the distribution of joule heat was used as the applied load for the simulation of temperature. Based on heat conduction and heat emission models, the temperature distribution in the reactor and the susceptor were gained. In order to improve the uniformity of the temperature on the top surface of the susceptor, the conventional concentric placement of the susceptor in the reactor was changed into the eccentric placement, which effectively improved the temperature uniformity and increased the heat efficiency. | ZHANG JinCheng, LI ZhiMing, HAO Yue , WANG Hao & LI PeiXian Key Laboratory of Fundamental Science for National Defense on Wide Band-Gap Semiconductor Technology, School of Microelectronics, Xidian University, Xi’an 710071, China | 2010 | Science China(Information Sciences)2010，53，10： | 7 |
| 2 | Enrichment characteristics and exploration directions of deep shale gas of Ordovician-Silurian in the Sichuan Basin and its surrounding areas,China显示文摘The enrichment characteristics of deep shale gas in the Ordovician Wufeng-Silurian Longmaxi formations in the Sichuan Basin and its surrounding areas are investigated through experiments under high temperature and high pressure,including petrophysical properties analyses,triaxial stress test and isothermal adsorption of methane experiment.(1)The deep shale reservoirs drop significantly in porosity and permeability compared with shallower shale reservoirs,and contain mainly free gas.(2)With higher deviatoric stress and axial strain,the deep shale reservoirs have higher difficulty fracturing.(3)Affected by structural location and morphology,fracture characteristics,geofluid activity stages and intensity,deep shale gas reservoirs have more complicated preservation conditions.(4)To achieve the commercial development of deep shale gas reservoirs,deepening geological understanding is the basis,and exploring reservoir simulation technology befitting the geological features is the key.(5)The siliceous shale and limestone-bearing siliceous shale in the Metabolograptus persculptus-Parakidograptus acuminatus zones(LM1-LM3 graptolite zones)are the high-production intervals for deep shale gas and the most favorable landing targets for horizontal drilling.Deeps water areas such as Jiaoshiba,Wulong,Luzhou and Changning with deep shale reservoirs over 10 m thickness are the most favorable areas for deep shale gas enrichment.It is recommended to carry out exploration and development practice in deep-water shale gas areas deposited deep with burial depth no more than 5000 m where the geological structure is simple and the shale thickness in the LM1-LM3 graptolite zone is greater than 10 m.It is better to increase the lateral length of horizontal wells,and apply techniques including high intensity of perforations,large volume of proppant,far-field and near-wellbore diversions to maximize the stimulated deep reservoir volume. | NIE Haikuan LI Pei DANG Wei DING Jianghui SUN Chuanxiang LIU Mi WANG Jin DU Wei ZHANG Peixian LI Donghui SU Haikun | 2022 | Petroleum Exploration and Development2022，49，4： | 3 |
| 3 | Role of lateral growth on the structural properties of high temperature GaN layer显示文摘The role of lateral growth on the structural properties of high temperature(HT) GaN epitaxial layer has been investigated by means of transmission electron microscopy(TEM) and X-ray diffraction(XRD).Variations of the lateral growth rate of HT GaN in metal-organic chemical vapor deposition(MOCVD) can be obtained by changing the V/Ⅲ ratio.It is found that under higher lateral growth rate,dislocation is easier to bend into subgrains away from c axis,and the position where bend occurs is closer to the buffer layer,however,dislocation density does not show to monotonically vary with increasing lateral growth rate.A model concerning the GaN growth dynamics and dislocation bending mechanics has been proposed to explain the correlation between lateral growth and the structural properties of GaN. | GAO ZhiYuan HAO Yue LI PeiXian ZHANG JinCheng | 2009 | Science China(Technological Sciences)2009，52，5： | 2 |
| 4 | Enhanced catalysis of ultrasmall Au-MoS_2 clusters against reactive oxygen species for radiation protection显示文摘Ionizing radiation produces excessive reactive oxygen species(ROS) which impose detrimental effects on biological systems. Thus, it is important to explore clinically safe and efficacious radioprotection agents to scavenge ROS and reduce the risks of radiotherapy. Recently, emerging catalytic nanomaterials such as sulfide nanomaterials have shown capability of clearing ROS in vivo by unique electron transfers between atoms, but their catalytic activities are yet suboptimal. As such, there is an unmet need to improve catalytic properties for stronger antioxidant activities and radiation protection. Herein, we prepared ultrasmall Au-MoS_2 clusters(~2.5 nm) and they showed enhanced catalytic properties via gold intercalation facilitating increased active sites and synergistic effects. Electrocatalysis results revealed that the catalytic activity of Au-MoS_2 towards H2O_2 was superior to ultrasmall MoS_2 without Au. As a result, we found that improving the electrocatalytic property of Au-MoS_2 can effectively enhance corresponding antioxidant activities and radioprotection effects in vivo. In addition, Au-MoS_2 also showed significant radioprotection in vitro and dramatically reduced the excess of radiation-induced adverse ROS. It also rescued radiation-induced DNA damages and protected the bone marrow hematopoietic system from ionizing radiation. | Peixian Bian Jinxuan Zhang Junying Wang Jiang Yang Jingya Wang Haile Liu Yuanming Sun Meixian Li Xiao-Dong Zhang | 2018 | Science Bulletin2018，63，14： | 2 |
| 5 | Enrichment type and resource characteris- tics of shale gas in China显示文摘 | Zhang Jinchuan Jiang Shengling Tang Xuan Zhang Peixian Tang Ying Jing Tieya | 2009 | Natural Gas Industry2009，29，12： | 1 |
| 6 | Effect of reflection and 2K gratings on self-pumped phase-conjugate mirrors: theoretical and experimental studies显示文摘 | S X Dou Mingjun Chi Xinya Zhang Yong Zhu Peixian Ye | 1999 | J Opt Soc Am B1999，16，3： | 1 |
| 7 | Effect of Reflection and 2K Gratings on Self-pumped Phase-cojugate Minors: Theoretical and Experimental Studies 显示文摘 | Dou S X Mingjun Chi Xinya Zhang Yong Zhu Peixian Ye | 1999 | J Opt Soc Am B1999，16，3： | 1 |
| 8 | Establishment of an animal model of dural venous sinus embolism显示文摘BACKGROUND: The pathological mechanism of secondary brain lesion following an embolism remains unclear. The establishment of an animal model that imitates the clinical pathophysiological processes is crucial to better study this disease during a certain time window. OBJECTIVE: To establish a new animal model of dural venous sinus embolism that is simple, has a high success rate, and emulates the pathophysiological course of clinical disease. DESIGN, TIME AND SETTING: A randomized block design trial was performed at the Department of Anatomy, Ningxia Medical College between March and December 2007. MATERIALS: Fifty-eight healthy, adult, Sprague Dawley rats were used in the present study. Plastic emboli, with a total length of 0.4 cm, were self-made. Each plastic embolus had a conical anterior segment; the largest diameter being 0.12 cm. The posterior segment became gradually thin and flat, with a width of 0.2 cm and length of 0.1 cm. METHODS: The fifty-eight rats were randomly divided into three groups: control (n = 6), embolism (n = 26), and sham-embolism (n = 26) groups. In the embolism group, a solid embolus was slowly inserted and fixed into the posterior part of the superior sagittal sinus against the flow of blood. The posterior segment was detained outside the superior sagittal sinus for fixing. In the sham-embolism group, rats were subjected only to sinus sagittalis superior exposure. In the control group, rats received no treatments. In both the embolism and the sham-embolism groups, the rat brains were resected at 6 hours, 1, 3, and 5 days post-surgery. MAIN OUTCOME MEASURES: (1) Brain surface appearance in the embolism and sham-embolism groups. (2) Thrombosis in the embolism group. (3) Cerebrospinal fluid content in the above-mentioned two groups. RESULTS: In the embolism group, the model success rate was 92% (24/26). There was visible thrombosis in the superior sagittal sinus. Cerebral edema was noticeable under a microscope. These changes were visible at 6 hours after embolism and were most obvious at 1 day after surgery. In the embolism group, cerebrospinal fluid content reached a peak level at 6 hours post-surgery and was significantly increased compared with the sham-embolism and the control groups (P < 0.05). At 1 day post-surgery, the amount of cerebrospinal fluid was still greater in the embolism group compared to the control group (P < 0.05) CONCLUSION: The method of inserting a solid embolus has many benefits, such as being able to directly observe, short cycle time, and minimal wound. The detained posterior segment prevents movement and perfusion of embolus, which results in a high success rate. | Peixian Zhang Chongzhi Zhang Yi Qin Quanrui Ma Jianying Du Ying Cai | 2008 | Neural Regeneration Research2008，3，5： | 1 |
| 9 | Broadband Fluorescence Guided-Wave in DANS/PMMA Thin Film Waveguides显示文摘The broadband fluorescence guided-waves excited in DANS/PMMA polymer thin film waveguides by an Ar+laser beam were demonstrated in terms of the observation of mlines with colour array.Considering the high brightness of these m-lines observation,we assert that it is a kind of stimulated amplification of fluorescence guided-wave. | WANG Huitian DONG Fengzhong ZHANG Zhanxiang YE Peixian QIU Ling SHEN Jifeng FU Xingfa SHEN Yuquan | 1994 | Chinese Physics Letters1994，11，2： | 0 |
| 10 | Observation of Optical Bistability Hysteresis Loop with Surface Waves in Doped Polymer Film显示文摘Optical bistability hysteresis loop has been observed experiment ally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The observed bistability hysteresis loop can be explained in terms of surface plasmon excitation and laser induced refractive index variations. | YE Peixian YU Zuhe ZHANG Zhanxiang SHEN Yuquan FU Xingfa | 1991 | Chinese Physics Letters1991，8，9： | 0 |
| 11 | Evaluation of sweet spots and horizontal-well-design technology for shale gas in the basin-margin transition zone of southeastern Chongqing,SW China显示文摘The shale gas accumulation conditions in the basin-margin transition zone of southeastern Chongqing in SW China are complex.In order to improve single-well productivity in this area,the geologic characteristics,major factors controlling the occurrence of sweet spots,and drilling/fracturing optimization were investigated in this study.The sweet spot evaluation system and criteria were established,and the horizontal-well-design technology was developed.The following three conclusions were drawn.First,the accumulation and high-productivity-oriented approaches for sweet spot evaluation are proposed and the criteria are established based on screened key indicators.Second,the horizontal well was designed based on:(1)the“six-map”method,to identify both the geology and engineering sweet spots for well locations;and(2)seismic attributes,to predict the development of fractures and cavities,and thus,avoid mud loss and improve the drilling efficiency.The target window,well-azimuth optimization,and the curvature were forecasted to improve the fracturing performances.Third,the Pingqiao anticline,Dongsheng anticline,Jinfo slope,and Wulong syncline were selected as Type I sweet spots.Currently,shale gas has been successfully discovered in the basin-margin transition zone and is being commercially developed. | Xipeng He Peixian Zhang Guisong He Yuqiao Gao Ming Liu Yong Zhang Dazhi Fang Yanjing Li | 2020 | Energy Geoscience2020，1，3： | 0 |
| 12 | Simple chemical synthesis and isotropic negative thermal expansion in MHfF_(6)(M=Ca,Mn,Fe,and Co)显示文摘The rapid progress of modern technologies has accelerated the prominence of thermal expansion mismatch between materials,and tunable thermal expansion materials will be a powerful safeguard against this challenge.Here,isotropic MHfF_(6)(M=Ca,Mn,Fe,and Co)compounds with tunable thermal expansion have been produced via a low-cost synthetic method and investigated.By utilizing temperature dependent X-ray diffraction(XRD)and Raman spectroscopy,combined with first principles calculations,it was revealed that the transverse thermal vibrations of the F atoms are dominated by low-frequency phonons with negative Grüneisen parameters and are therefore the origin of the negative thermal expansion(NTE).Very interestingly,with the increase of the M atomic number,the metal…F atomic linkages become stiffer,reducing the number of vibrational modes with negative Grüneisen parameters,so that the strong NTE can be gradually adjusted to moderate NTE and to near zero thermal expansion.The present study achieves the tunable thermal expansion in a new compound family and shed light on the internal mechanism from the perspective of lattice vibrational dynamics. | Yongqiang Qiao Sen Zhang Peixian Zhang Juan Guo Andrea Sanson Xi Zhen Kaiyue Zhao Qilong Gao Jun Chen | 2024 | Nano Research2024，17，3： | 0 |
| 13 | Photo refractive Proper ties of Paraelec trie Copper Doped Pot assium Tant ala te Niobate显示文摘The photorefractive properties of Cu doped KTa_(1-x)Nb_(x)O_(3) have been st tidied by using two-wave mixing method.The diffraction efficiency reaches as high as 52%under an electric Held.The dependences of diffraction efficiency on interference angles and applied fields Aave been studied.The maximum light induced index chajige is found to be 2.33×10^(-5) and the photorefraction sensitivity calculated is 5×10^(-6)cm^(2)/J.Experimental results demonstrate that electrons are the dominant charge carriers. | GUAN Qingcai WANG Jiyang WANG Min LIU Yaogang WEI Jingqian ZHANG Zhiguo YANG Changxi YE Peixian | 1991 | Chinese Physics Letters1991，8，10： | 0 |
| 14 | An integrative analysis of metabolomics,DNA methylation and RNASeq data reveals key genes involved in albino tea'Haishun 2'显示文摘Albino tea,a type of tea closely associated with the chlorophyll-deficient phenotype is of great interest due to its multiple benefits to human health.To explore the potential mechanisms involved in albino tea,we performed metabolomics,DNA methylation and RNA-Seq analysis of green and albino leaves in a special tea mutant'Haishun 2'.The albino leaves accumulated significantly less catechins compared with the green leaves,which is closely associated with their difference in chlorophyll formation.A total of 385 candidate genes were identified by the integrative analysis.Two NAC transcription factors were less methylated and highly up regulated in the albino leaves of'Haishun 2',which was the first identification of the key roles of NAC transcription factors in albino tea and worth further study.Many genes involved in catechin biosynthesis were down regulated in albino leaves,such as 4-coumarate-CoA ligase,flavonol synthase and leucoanthocyanidin reductase genes,suggesting chlorophyll formation is important for catechin biosynthesis.Furthermore,CsMYB5 and CsGSTF11 were found to be differentially methylated and expressed in albino and green leaves,indicating their potential roles in catechin accumulation.This was the first report of the integrative analysis of transcriptome and DNA methylation data in tea plants and the results suggest that the integrative analysis is useful for exploring key genes associated with epigenetic changes in tea plants. | Kang Wei Shuping Yu Qili Quan Shirin Aktar Mengdi He Yazhen Zhang Huihan Fang Rongmei Wu Li Ruan Peng Mao Peixian Bai Liyun Wu Hao Cheng Liyuan Wang | 2022 | Beverage Plant Research2022，2，1： | 0 |
| 15 | NEW ORGANIC SYSTEM FOR PHOTON-GATED PERSISTENT SPECTRAL HOLE BURNING显示文摘We report a new system of organic materials for photon-gated persistent spectral hole burning by donor-acceptor electron transfer:a tetrabenzoporphyrin derivative as donor and one of several aromatic cyanides as an acceptor in a poly(methyl methacrylate)(FMMA)host matrix.Up to 50C%deep spectral holes in transmission were burnt and appeared very high hole burning efficiency. | WANG Duoyuan HU Lingzhi HE Huizhu XIE Jie ZHANG Junyi ZHAO Lizeng ZHANG Xiulan ZHANG Dongxiang MI Xin NIE Yuxin YE Peixian | 1990 | Chinese Physics Letters1990，7，12： | 0 |
| 16 | Assessment of the immigration effect and choice of development pattern for scenic areas:a case study of Wuyi Mountain, China显示文摘Mountainous regions face a series of conflicts between the natural resources conservation and the economic development, especially in protected areas, where are the home to some of the poorest people in the world. In China, the Protected Areas Authorities (such as Protected Areas Authorities of Wuyi Mountain) transferred the mountainous people out of the protected areas. We found that it is not a good approach of immigration project, as far as economic and ecological effect is concerned. Although remote and majestic beauty attracted many tourists, mass tourism is not a good approach to solve the development problem in mountainous areas because it can not provide enough opportunities to make local people live a comfortable life, and the high volume of tourists indicates that the resources face significant threats. Because many landscapes are run by private enterprises, local residents and gov-ernment only get limited benefits. Although ecotourism principles expatiate on economic development and resources conservation, local people income and tourists feelings, it has discordance between the theory and the practice. Therefore, the term of 'integrated ecotourism' was coined in the paper based on the ecotourism theory. Integrated ecotourism means a broadly tourism resources and pendulum spatial pattern which will come into being with the movement of local people and tourists from protected areas to the nearby town or city; and it also tries to solve the property right conflict of mountain land between the local people and the private enterprises according to property right theory. | Wang Peixian Dong Suocheng Zhang Yuanyuan Xu Lin Yan Shenghu | 2008 | Ecological Economy2008，4，1： | 0 |
| 17 | Observation of Optical Bistabilities in a Doped Polymer Thin Film Quasi-waveguide显示文摘Optical bistability was observed and studied in the output of reflected beam as well as in that of m-lines in a doped polymer thin film quasi-waveguide.The physical origin was demonstrated to be the existence of a mode spectrum and the high third order nonlinearity of the polymer film.It was also observed for the first time that the intensity variation of the reflected beam and the m-line in the hysteresis loops are complementary to each other. | WANG Huitian DONG Fengzhong ZHANG Zhanxiang YE Peixian QIU Ling SHEN Jifeng FU Xingfa SHEN Yuquan | 1995 | Chinese Physics Letters1995，12，4： | 0 |
| 18 | Observation of Optical Bistability Hysteresis Loop with Surface Waves in Doped Polymer Film显示文摘Optical bistability hysteresis loop has been observed experimentally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The observed bistability hysteresis loop can be explained in terms of surface plasmon excitation and laser induced refractive index variations. | YE Peixian YU Zuhe ZHANG Zhanxiang SHEN Yuquan FU Xingfa | 1991 | Chinese Physics Letters1991，8，6： | 0 |
| 19 | Stimulating and harnessing circularly polarized luminescence of helically assembled carbonized polymer dots via interfacial dynamics显示文摘Stimulating and harnessing circularly polarized luminescence(CPL)is not only a sine qua non for fundamentally unveiling chirogenesis in physical chemistry,but also a pivotal prerequisite for implementation of such phenomenon in research fields including chiral optoelectronics and theranostics.Herein,red-emissive carbonized polymer dots(CPDs)-based helical structures were synthesized in this work via biomolecule-tailored organic–inorganic co-assembly strategy.The surface statesrelated chirality exhibits enhanced circular dichroism(CD)and CPL activities with anisotropic factors as high as gCD,max=5.4×10^(−3) and glum,max=1.5×10^(−2),respectively.The obtained CPL signals can be further manipulated in an excitationdependent manner,indicating that a synergistic-competition phenomenon exists between configurational chirality and intermolecular energy-transfer dynamics,which is further supported by simulations based on density function theory(DFT).Such tunable CPL behavior triggers revolutionary designs and applications of these chiral CPDs into the realm of chirality-related biological issues and next-generation chiral optoelectronics. | Jiaying Lin Rulin Liu Peixian Chen Yangfei Lv Junjie Hao Meijuan Chen Dongxiang Zhang Ruikun Pan Yiwen Li Xi Zhu Tingchao He Jiaji Cheng | 2023 | Aggregate2023，4，4： | 0 |
| 20 | Enrichment mechanism and resource potential of shale-type helium:A case study of Wufeng Formation-Longmaxi Formation in Sichuan Basin显示文摘China’s helium resource is highly dependent on overseas imports.Organic-rich and U/Th-rich shale reservoirs generally contain helium,and although the helium content is low,the total reserve is large.Therefore,the effective development and utilisation of shale-type helium resources is a realistic way to improve the security of helium resources in China.In this study,the generation mechanism,helium source and content,migration modes and pathways,controlling factors of enrichment,distribution pattern,and resource potential of the helium were analysed,using the Wufeng-Longmaxi shale in the Sichuan Basin and its periphery.Furthermore,countermeasures were proposed for shale-type helium exploration and development.The results show that the Wufeng-Longmaxi shale has a high content of U and Th and a good ability to generate helium.The helium is generated by a typical crustal source of helium and is characterised by self-generation,self-storage,and wide distribution.The helium resource potential is a product of its content and the resources of the associated natural gas.The continuous supply of helium and effective preservation are the main geological factors that control the enrichment of shale-type helium.The preliminary evaluation results show that the reserves of helium in proven shale gas reserves are 10.8×10^(8)m^(3)in the Sichuan Basin and its periphery,where the extra-large helium fields are likely to be discovered.Additionally,0.0912×10^(8)m^(3)of helium was produced,along with the annual production of shale gas.To avoid the waste of helium and to improve the self-supply ability,it is suggested that research on the resource potential,enrichment mechanism,and distribution pattern of shale-type helium should be carried out as soon as possible,and helium extraction techniques for helium-bearing natural gas should be studied. | Haikuan NIE Quanyou LIU Wei DANG Pei LI Haikun SU Hanyong BAO Liang XIONG Zhujiang LIU Chuanxiang SUN Peixian ZHANG | 2023 | Science China Earth Sciences2023，66，6： | 0 |
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