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SCATTERING ANALYSIS OF E-PLANE UNIFORM DIELECTRIC POSTS IN RECTANGULAR WAVEGUIDES

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Journal of Electronics(China) 1989年第4期6卷 373-377页

作者：范鹏范德森 University of Science and Technology of China Hefei

Based on the polarization current integral equation with the modified Green’s Function as ker-nel, the scattering properties of the E-plane. uniform dielectric posts in rectangular waveguide arenumerically analyzed by the moment method. These posts are of arbitrary cross section and post-numberThe calculation accuracy and speed are remarkable improved by segmenting the dielectric region into manysmall rectangular oells and applying local analytic integration. The higher-order modes are considered in cal-culation, improving the computation accuracy and providing the scattering information of all modes excitedas well.

关键词： Rectangular Waveguide Scattering Properties Moment method

High-efficiency circularly polarized emission from liquid-crystalline platinum complexes

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Chinese Chemical Letters 2023年第6期34卷 310-314页

作者： peng fan Zhou fang Shengyue Wang Qiwei Dong Chen Xiao Alice J.McEllin Duncan W.Bruce Weiguo Zhu Yafei Wang Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials Jiangsu Collaborative Innovation Center of Photovoltaic Science and EngineeringJiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and ApplicationsSchool of Materials Science&EngineeringChangzhou UniversityChangzhou 213164China Department of Chemistry University of YorkYork YO105DDUnited Kingdom Anhui Sholon New Material Technology Co. Ltd.Chuzhou 239500China

Realizing both a high emission efficiency and luminescence dissymmetry factor(g_(lum))in circularly polarized solution processable organic light-emitting diodes(CP-OLEDs)remains a significant *** this contribution,two chiral phosphorescent liquid crystals based on cyclometalated platinum complexes are prepared,in which the chiral s-2-methyl-1-butyl group is introduced into the cyclometalating ligand and the mesogenic fragment is attached to the periphery of the ancillary *** platinum complexes exhibit both smectic and chiral nematic phases as evidenced by polarized optical microscopy,differential scanning calorimetry and small-angle X-ray ***,a high photoluminescent quantum efficiency of over 78%and clear circularly polarized luminescent signal with g_(PL)of about 10^(-2)are observed for the ***,solution-processed CP-OLEDs show maximum external quantum efficiencies(EQE)of over 15%and strong circularly polarized electroluminescent signals with a g_(EL)≈10^(-2).This research demonstrates that both liquid crystallinity and the number of chiral centers play key roles in improving the chiroptical property,paving the way for a new approach for the design of high-efficiency CPL emitters.

关键词： Circularly polarized emission Liquid-crystalline Platinum complex Organic light-emitting diodes

Study of waveguide coupling efficiency in hybrid silicon lasers

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Optoelectronics Letters 2008年第4期4卷 239-242页

作者： RAN Qi-jiang HAN Pei-de QUAN Yu-jun GAO Li-peng ZENG fan-ping ZHAO Chun-hua State Key Laboratory of Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Science Beijing 100083 China

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon *** find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP *** coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 *** result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 ***,our invariable coupling power technique is simpler than Intel's.

关键词：混合硅激光器波导耦合效率激光技术

Generation and Immunogenicity of a Recombinant Adenovirus Co-Expressing the E2 Protein of Classical Swine Fever Virus and the GP5 Protein of Porcine Reproduction and Respiratory Syndrome Virus

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Agricultural Sciences in China 2011年第11期10卷 1781-1791页

作者： LI Hong-yun SUN Yuan ZHANG Xing-juan CHANG Tian-ming WANG Xiang-peng HE fan HUANG Jun-hua QIU Hua-ji Division of Swine Infectious Diseases National Key Laboratory of Veterinary Biotechnology Harbin Veterinary Research Institute ChineseAcademy of Agricultural Sciences Harbin 150001 P.R. C＇hina

Classical swine fever （CSF） and porcine reproduction and respiratory syndrome （PRRS） are both economically important, highly contagious diseases of swine worldwide. To develop an effective vaccine to control these two diseases, we constructed a recombinant adenovirus rAdV-GP52AE2, using a replication-defective human adenovirus serotype 5 as a delivery vector, to co-express the GP5 protein of highly pathogenic porcine reproduction and respiratory syndrome virus （PRRSV） and the E2 protein of classical swine fever virus （CSFV）. Foot-and-mouth disease virus （FMDV） 2A peptide was used as a linker between the GP5 and E2 proteins to allow automatic self-cleavage of the polyprotein. The GP5 and E2 genes were expressed as demonstrated by immunofluorescence assay and Western blotting. Immunization of mice resulted in a CSFV-neutralizing antibody titer of 1：128 and a PRRSV-neutralizing antibody titer of 1：16. The lymphoproliferative responses were detected by Cell Counting Kit-8 assay and the stimulation index of CFSV-specific and PRRSV-specific lymphocytes in the rAdV-GP52AE2 group was significantly higher than that in the negative control group. The results show that rAdV-GP52AE2 can induce both effective humoral and cell-mediated immune responses in mice. The protective efficacy of the recombinant virus against CSF was evaluated in immunized rabbits, which were protected from fever induced by challenge with C-strain. Our study provides supporting evidence for the use of FMDV 2A to develop a bivalent genetically-engineered vaccine.

关键词： porcine reproductive and respiratory syndrome virus classical swine fever virus recombinant adenovirus,immunogenicity

Preparation of nanoparticles with an environment-friendly approach

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Journal of Environmental Sciences 2009年第6期21卷 727-730页

作者： YAO Kefu,peng Zhen,fan Xiaolin Key Laboratory of Advanced Materials Processing Technology,Ministry of Education of China,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China. [a]Key Laboratory of Advanced Materials Processing Technology Ministry of Education of China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

Developing various approaches for preparing high performance materials has long been topics and tasks both for scientists and for engineers. Despite that many methods have been developed for preparing nanomaterials, developing simple and environment-friendly ways for preparing nanomaterials is very attractive. Here a simple approach of synthesizing Fe3O4 nanoparticles by arc-discharge submerging in water was reported. The results showed that by this method Fe3O4 nanoparticles can be synthesized at large scale. The as-prepared Fe3O4 nanoparticles exhibited uniform spherical shape and their diameters varied with arc-discharging parameters. The experimental results showed that the size of the synthesized Fe3O4 nanoparticles can be controlled through adjusting the processing parameters. Since no vacuum system has been used, the synthesizing process is greatly simplified. In addition, only cheap deionized water and industrial iron bar are used and no pollution or harmful byproducts are found in the synthesis process. It indicated that the present approach is a simple, low-cost and environment-friendly one for preparing nanoparticles.

关键词： nanoparticles preparation approach Fe3O4

Edge-and strain-induced band bending in bilayer-monolayer Pb_(2)Se_(3) heterostructures

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Chinese Physics B 2021年第1期30卷 114-117页

作者： peng fan Guojian Qian Dongfei Wang En Li Qin Wang Hui Chen Xiao Lin Hong-Jun Gao Institute of Physics and University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation Beijing 100190China

By using scanning tunneling microscope/microscopy(STM/STS), we reveal the detailed electronic structures around the sharp edges and strained terraces of lateral monolayer-bilayer Pd_(2)Se_(3) heterostructures. We find that the edges of such heterostructures are well-defined zigzag type. Band bending and alignment are observed across the zigzag edge, forming a monolayer-bilayer heterojunction. In addition, an n-type band bending is induced by strain on a confined bilayer Pd_(2)Se_(3) terrace. These results provide effective toolsets to tune the band structures in Pd_(2)Se_(3)-based heterostructures and devices.

关键词： Pd_(2)Se_(3) band bending lateral heterostructures scanning tunneling microscope/spectroscopy

Tumor regression grades:Potential outcome predictor of locally advanced rectal adenocarcinoma after preoperative radiotherapy

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World Journal of Gastroenterology 2015年第6期21卷 1851-1856页

作者： Yi-fan peng Wei-Dong Yu Hong-Da Pan Lin Wang Ming Li Yun-Feng Yao Jun Zhao Jin Gu Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education) Department of Colorectal Surgery Peking University Cancer Hospital and Institute Institute of Clinical Molecular Biology People’s Hospital Peking University

AIM:To analyze tumor regression grade(TRG)for prognosis of locally advanced rectal adenocarcinoma(LARA)treated with preoperative ***:One hundred and ninety patients with clinical stageⅡ/ⅢLARA were *** patients underwent radical surgery(between 2004 and 2010)after 30-Gy/10-fraction preoperative radiotherapy(preRT).All 190 patients received a short course of preRT and were reassessed for disease recurrence and survival;the slides of surgical specimens were reviewed and classified according to Mandard *** compared patients with good response(Mandard TRG1 or TRG2)vs patients with bad/poor response(Mandard TRG3-5).Outcomes evaluated were 5-year overall survival(OS),5-year disease-free survival(DFS),and local,distant and mixed ***’s exact test orχ2 test,logrank test and proportional hazards regression analysis were used to calculate the probability that Mandard TRG was associated with patient ***:One hundred and sixty-six of 190 patients(87.4%)were identified as Mandard bad responders(TRG3-5).High Mandard grade was correlated with tumor height(41.7%<6 cm vs 58.3%≥6 cm,P=0.050),yp T stage(75%yp T0-2 vs 25%yp T3-4,P=0.000),and yp N stage(75%yp N0 vs 25%yp N1,P=0.031).In univariate survival analysis,Mandard grade bad responders had significantly worse OS and DFSthan good responders(TRG1/2)(OS,83.1%vs 96.4%,P=0.000;DFS,72.3%vs 92.0%,P=0.002).In multivariate survival analysis,Mandard bad responders had significantly worse DFS than Mandard good responders(DFS 3.8 years(95%CI:1.2-12.2 years,P=0.026).CONCLUSION:Mandard grade good responders had a favorable *** may be a potential predictor for DFS in LARA after pre-RT.

关键词： Tumor regression grade Preoperative radiotherapy R

Ecology and social system of northern gibbons living in cold seasonal forests

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Zoological Research 2018年第4期39卷 255-265页

作者： Zhen-Hua Guan Chang-Yong Ma Han-Lan Fei Bei Huang Wen-He Ning Qing-Yong Ni Xue-Long Jiang peng-Fei fan Yunnan Academy of Biodiversity Forest Disaster Warning and Control Key Laboratory Southwest Forestry University School of Life Sciences Sun Yat-Sen University State Key Laboratory of Genetic Resources and Evolution Kunming Institute of Zoology Chinese Academy of Sciences College of Animal Sciences and Technology Sichuan Agricultural University

Gibbons in China represent the northernmost margin of present day gibbon species distribution （around N25°）. Compared to tropical habitats, northern gibbon habitats are characterized by low temperatures and remarkable seasonal variation in fruit abundance How gibbons adapt to their cold and seasonal habitats and what ecological factors affect their sociality are key questions for understanding their ecology and social system evolution, the elucidation of which will contribute to the conservation of these special populations/species. According to preliminary short-term studies, northern gibbons consume more leaves and use larger home ranges than tropical gibbons. Interestingly, some Nomascus groups consist of more than one adult female. However, these preliminary results are not well understood or incorporated into current socio-ecological theories regarding gibbon species. To better understand northern gibbons, our team has systematically studied three habituated groups of Nomascus concolor, three groups of N. nasutus, and two habituated groups of Hoolock tianxing since 2002. In this paper, we stress the challenges facing gibbons living in northern habitats and summarize their behavioral adaptations to their harsh environments. We also describe the northern gibbon social system and discuss the potential relationships between their ecology and sociality. Finally, we highlight future research questions related to northern gibbons in China.

关键词： Northern gibbon Ecology Social system Adaptation Group size

Shale oil resource evaluation with an improved understanding of free hydrocarbons:Insights from three-step hydrocarbon thermal desorption

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Geoscience Frontiers 2023年第6期14卷 464-477页

作者： Gang Yan Yao-Hui Xu Wang-Lin Xu Bin Bai Ying Bai Yun-peng fan Shan-Shan Li Ming Zhong Yan Liu Zhi-Yao Xu Cooperative Innovation Center of Unconventional Oil and Gas Yangtze University(Ministry of Education&Hubei Province)Wuhan 430100China Hubei Key Laboratory of Petroleum Geochemistry and Environment Yangtze UniversityWuhan 430100China Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China School of Energy and Resources China University of GeosciencesBeijing 100083China Suzhou Grand Energy Technology Co.Ltd Suzhou 215129China

The pyrolysis parameter S1,which indicates the amount of free hydrocarbons present in shale,is often underestimated due to hydrocarbon loss during sample handling and measurement *** remedy this issue,we strongly recommend an immediate three-step hydrocarbon thermal desorption(HTD)approach to be conducted on oil shale at the drilling *** approach measures S_(g),S_(O),and S_(1)^(*),which refer to gaseous,light,and free hydrocarbons,*** new shale oil content value,calculated from the total of these three parameters,is far more precise and reliable than traditional pyrolysis ***,we thoroughly investigated the components and microscopic occurrence features of hydrocarbons thermally desorbed at three temperature stages using gas chromatography(GC)and X-ray microcomputed tomography(CT).For example,we selected Chang 7_(3)mud *** experimental results irrefutably indicate that the ultimate shale oil content of poor resource rocks is significantly impacted by evaporative loss,with this effect being greater when the total organic carbon(TOC)is ***,C_(1-5)and C_(1-7)hydrocarbons constitute almost all of S_(g)and S_(O),respectively.S_(g)and S_(O)are predominantly composed of C_(1-3)gaseous hydrocarbons,with a maximum proportion of 42.93%.In contrast,S_(1)^(*)contains a substantial amount of C_(16-31)hydrocarbons.A three-dimensional reconstruction model of an X-ray micro-CT scan shows that while the amount of shale organic matter greatly decreases from the frozen state to 300℃,the pore volume significantly increases,particularly between 90 and 300℃.The increased pore volume is mainly due to macropores and *** is imperative to note that the shale oil triple-division boundaries must be adjusted based on more accurate oil content,although this would not affect the resource zones to which the samples already belong(ineffective,low-efficient,and enriched resources).In conclusion,we strongly advise conducting an immediat

关键词： Shale oil Hydrocarbon thermal desorption Resource evaluation Component Microscopic occurrence feature