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Preparation and Characteristics of GaN Films on Freestanding CVD Thick Diamond Films

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Chinese Physics Letters 2010年第1期27卷 260-263页

作者：张东白亦真秦福文边继明贾福超吴占玲赵纪军姜辛 School of Physics and Optoelectronic technology Dalian University of Technology Dalian 116024 Key laboratory of Materials Modification by Laser Ion and Electron Beams (Ministry of Education) Dalian University of Technology Dalian 116024 College of Advanced Science and technology Dalian University of Technology Dalian 116024 institute of Materials Engineering University of Siegen Paul-Bonatz-StraBe 9-11 D-57076 Siegen Germany

Prefer-oriented and fine grained polycrystalline GaN films are prepared by plasma enhanced metal organic chemical vapour deposition on nucleation surfaces of freestanding thick diamond films. The characteristics of the GaN films are characterized by x-ray diffraction, reflection high energy electron diffraction and atomic force microscopy. The results indicate that the structure and morphology of the films are strongly dependent on the deposition temperature. The most significant improvements in morphological and structural properties of GaN films are obtained under the proper deposition temperature of 400°C.

关键词： Chinese climate network complex systems small world community

Targeted mutagenesis:A sniper-like diversity generator in microbial engineering

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Synthetic and Systems Biotechnology 2017年第2期2卷 75-86页

作者： Xiang Zheng Xin-Hui Xing Chong Zhang Key laboratory for Industrial Biocatalysis Ministry of EducationInstitute of Biochemical EngineeringDepartment of Chemical EngineeringCenter for Synthetic&Systems BiologyTsinghua UniversityBeijing 100084China

Mutations,serving as the raw materials of evolution,have been extensively utilized to increase the chances of engineering molecules or microbes with tailor-made *** and targeted mutagenesis are two main methods of obtaining various mutations,distinguished by the range of action they can *** the former one stresses the mining of novel genetic loci within the whole genomic background,targeted mutagenesis performs in a more straightforward manner,bringing evolutionary escape and error catastrophe under *** this review,we classify the existing techniques of targeted mutagenesis into two categories in terms of whether the diversity is generated in vitro or in vivo,and briefly introduce the mechanisms and applications of them *** inherent connections and development trends of the two classes are also discussed to provide an insight into the next generation evolution research.

关键词： Mutations Targeted mutagenesis Evolution Synthetic biology

Optimal scheduling of power systems considering demand response

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Journal of Modern Power Systems and Clean Energy 2016年第2期4卷 180-187页

作者： Zhaohong BIE Haipeng XIE Guowei HU Gengfeng LI State Key laboratory of Electrical Insulation and Power Equipment Department of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049China State Grid Jiangsu Economic Research institute Nanjing 210000China

A novel optimal scheduling method considering demand response is proposed for power systems incorporating with large scale wind *** proposed method can jointly dispatch the energy resources and demand side resources to mitigate the fluctuation of load and wind power *** is noticed in practical operation that,without customer’s satisfaction being considered,customers might reject the too frequent or violent demand response all *** this case,two indices that measure the customer satisfaction are then introduced as constraints to reduce the impact to end-users and avoid extreme demand *** make the model solvable,a proximate decoupling technique is used to dispose the concave constraint introduced by the customer satisfaction *** from the case studies show that the proposed model can significantly reduce the operation cost of power system while the demand response meets customer ***,the total start-up costs of conventional thermal units decreases dramatically due to less startup ***,compared to the consumption way satisfaction constraint,the payment satisfaction constraint has a heavier influence on the cost.

关键词： Optimal scheduling Wind power Real-time pricing Customer satisfaction

High-power continuous-wave optical waveguiding in a silica micro/nanofibre

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Light(Science & Applications) 2023年第5期12卷 809-816页

作者： Jianbin Zhang Yi Kang Xin Guo Yuhang Li Keying Liu Yu Xie Hao Wu Dawei Cai Jue Gong Zhangxing Shi Yingying Jin Pan Wang Wei Fang Lei Zhang Limin Tong Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationCollege of Optical Science and EngineeringZhejiang University310027 HangzhouChina Intelligent Optics&Photonics Research Center Jiaxing Institute of Zhejiang University314000 JiaxingChina State Key laboratory of Precision Measurement technology and Instruments Department of Precision InstrumentTsinghua University100084 BeijingChina Research Center for Intelligent Sensing Zhejiang Lab311121 HangzhouChina Collaborative Innovation Center of Extreme Optics Shanxi University030006 TaiyuanChina

As miniature fibre-optic platforms,micro/nanofibres(MNFs)taper-drawn from silica fibres have been widely studied for applications from optical sensing,nonlinear optics to optomechanics and atom *** continuous-wave(CW)optical waveguiding is frequently adopted,so far almost all MNFs are operated in low-power region(e.g.,higher than 10 W,which is about 30 times higher than demonstrated ***,we predict an optical damage threshold of 70 *** highpower CW waveguiding MNFs,we demonstrate high-speed optomechanical driving of microparticles in air,and second harmonic generation efficiency higher than those pumped by short *** results may pave a way towards high-power MNF optics,for both scientific research and technological applications.

关键词： power waveguide pumped

Temporal and spatial changes of microbial community in an industrial effluent receiving area in Hangzhou Bay

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Journal of Environmental Sciences 2016年第6期28卷 57-68页

作者： Yan Zhang Lujun Chen Renhua Sun Tianjiao Dai Jinping Tian Wei Zheng Donghui Wen School of Environment Tsinghua University Beijing 100084 China College of Environmental Sciences and Engineering Peking University Belting 100871 China Zhejiang Provincial Key laboratory of Water Science and technology Department of Environmental Technology and Ecology Yangtze Delta Region Institute of Tsinghua University Zhejiang Jiaxing 314050 China Zhejiang Shuangyi Eauironmental technology Develoioment Co. Ltd. Jiaxing 314000 China Rural Energy & Environment Agency Ministry of Agriculture Beijing 100125 China

Anthropogenic activities usually contaminate water environments, and have led to the eutrophication of many estuaries and shifts in microbial communities. In this study, the temporal and spatial changes of the microbial community in an industrial effluent receiving area in Hangzhou Bay were investigated by 454 pyrosequencing. The bacterial community showed higher richness and biodiversity than the archaeal community in all sediments. Proteobacteria dominated in the bacterial communities of all the samples; MarineGroupⅠand Methanomicrobia were the two dominant archaeal classes in the effluent receiving area. PCoA and AMOVA revealed strong seasonal but minor spatial changes in both bacterial and archaeal communities in the sediments. The seasonal changes of the bacterial community were less significant than those of the archaeal community, which mainly consisted of fluctuations in abundance of a large proportion of longstanding species rather than the appearance and disappearance of major archaeal species. Temperature was found to positively correlate with the dominant bacteria, Betaproteobacteria, and negatively correlate with the dominant archaea,MarineGroupⅠ; and might be the primary driving force for the seasonal variation of the microbial community.

关键词： Bacterial community Archaeal community 454 pyrosequencing Effluent receiving area Sediment Hangzhou Bay

Versatile tape-drive target for high-repetition-rate laser-driven proton acceleration

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High Power Laser Science and Engineering 2023年第4期11卷 59-69页

作者： N.Xu M.J.V.Streeter O.C.Ettlinger H.Ahmed S.Astbury M.Borghesi N.Bourgeois C.B.Curry S.J.D.Dann N.P.Dover T.Dzelzainis V.Istokskaia M.Gauthier L.Giuffrida G.D.Glenn S.H.Glenzer R.J.Gray J.S.Green G.S.Hicks C.Hyland M.King B.Loughran D.Margarone O.McCusker P.McKenna C.Parisuaña P.Parsons C.Spindloe D.R.Symes F.Treffert C.A.J.Palmer Z.Najmudin John Adams institute for Accelerator Science Blackett LaboratoryImperial College LondonLondonUK School of Maths and Physics Queen’s University BelfastBelfastUK Central Laser Facility STFC Rutherford Appleton LaboratoryDidcotUK SLAC National Accelerator laboratory Menlo ParkUSA ELI Beamlines Centre Institute of PhysicsCASDolni BrezanyCzech Republic Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in PraguePragueCzech Republic department of Physics SUPAUniversity of StrathclydeGlasgowUK department of Mechanical Engineering Stanford UniversityStanfordUSA department of Applied Physics Stanford UniversityStanfordUSA department of Electrical and Computer Engineering University of AlbertaEdmontonCanada Institut für Kernphysik Technische Universität DarmstadtDarmstadtGermany

We present the development and characterization of a high-stability,multi-material,multi-thickness tape-drive target for laser-driven acceleration at repetition rates of up to 100 *** tape surface position was measured to be stable on the sub-micrometre scale,compatible with the high-numerical aperture focusing geometries required to achieve relativistic intensity interactions with the pulse energy available in current multi-Hz and near-future higher repetition-rate lasers(>kHz).Long-term drift was characterized at 100 Hz demonstrating suitability for operation over extended *** target was continuously operated at up to 5 Hz in a recent experiment for 70,000 shots without intervention by the experimental team,with the exception of tape replacement,producing the largest data-set of relativistically intense laser–solid foil measurements to *** tape drive provides robust targetry for the generation and study of high-repetitionrate ion beams using next-generation high-power laser systems,also enabling wider applications of laser-driven proton sources.

关键词： high-repetition-rate laser target laser-plasma acceleration proton generation tape-drive target

Causal relationship between 14 site-specific cancers and venous thromboembolism

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Cancer Innovation 2022年第4期1卷 316-327页

作者： Xiong Chen Xiaosi Hong Shulu Luo Jiahao Cai Guiwu Huang Runnan Shen Lin Lv Gaochen Bai Wen Fu Li Yan Guochang Liu Kai Huang Qinchang Chen department of Paediatric Urology Guangzhou Women and Children's Medical CenterGuangzhou Medical UniversityGuangzhouChina department of Paediatric Surgery Guangzhou Institute of PaediatricsGuangzhou Medical UniversityGuangzhouChina department of Endocrinology Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhouChina department of Prosthodontics Hospital of StomatologyGuanghua School of StomatologyGuangdong Provincial Key Laboratory of StomatologySun Yat-sen UniversityGuangzhouChina department of Pediatric Neurology Guangzhou Women and Children's Medical CenterGuangzhou Medical UniversityGuangzhouChina department of Orthopedics The First Affiliated Hospital of Sun Yat-Sen UniversityGuangzhouChina Medical School Sun Yat-sen UniversityGuangzhouChina department of Cardiovascular Surgery Sun Yat-sen Memorial HospitalGuangzhouChina department of Pediatric Cardiology Guangdong Provincial Key Laboratory of Structural Heart DiseaseGuangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangdong Cardiovascular InstituteGuangzhouChina

Background:It has been observed that cancer and venous thromboembolism(VTE)are associated,but anticancer therapy may violate the ***,this study aimed to elucidate the causal relationship of various cancers to VTE using Mendelian randomization(MR).Methods:Three MR methods were used to estimate causal effects:Inverse variance weighted(IVW),MR-Egger and weighted *** analyses included Cochran's Q-test,MR-Egger intercept test and *** ontology enrichment analysis was performed to elucidate the underlying mechanisms of VTE development in cancer ***:The primary IVW approach showed that non-Hodgkin's lymphoma(NHL)might increase the risk of VTE(odds ratio[OR]:1.20,95%confidence interval[95%CI]:1.00–1.44,p=0.045),while melanoma possibly reduced the risk of VTE(OR:0.89,95%CI:0.82–0.97,p=0.006),although there was no significance after adjustment for multiple *** association was observed between VTE risk and other site-specific *** ontology enrichment analysis revealed that vitamin D played an important role in the development of VTE in cancer ***:Our findings suggested that genetically predicted NHL was associated with higher VTE risk,whereas melanoma had lower VTE risk compared with other site-specific ***,this study suggested that anticancer therapy and increased extensive examination might play a more important role in VTE development than the nature of cancer.

关键词： cancer venous thromboembolism Mendelian randomization causal effect

Spin excitations in nickelate superconductors

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Science China(Physics,Mechanics & Astronomy) 2020年第8期63卷 114-122页

作者： Tao Zhou Yi Gao ZiDan Wang Guangdong Provincial Key laboratory of Quantum Engineering and Quantum Materials Guangdong Provincial Engineering Technology Research Center for Quantum Precision MeasurementSchool of Physics and Telecommunication Engineeringand Frontier Research Institute for PhysicsSouth China Normal UniversityGuangzhou 510006China department of Physics and institute of Theoretical Physics Nanjing Normal UniversityNanjing 210023China department of Physics and HKU-UCAS Joint institute for Theoretical and Computational Physics at Hong Kong The University of Hong KongHong Kong 999077China

Applying a three-band model and the random phase approximation,we theoretically study the spin excitations in nickelate superconductors,which have been newly *** spin excitations were found to be incommensurate in the low energy *** spin resonance phenomenon emerged as the excitation energy *** intensity can be maximized at the incommensurate or commensurate momentum,depending on the out-of-plane *** spin excitations reverted to incommensurate at higher *** also discuss the similarities and differences in the spin excitations of nickelate and cuprate *** predicted results can be later validated in inelastic neutron scattering experiments.

关键词： nickelates superconductivity d-wave pairing spin susceptibility

Heat flow distribution in Chinese continent and its adjacent areas

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Progress in Natural Science:Materials International 2008年第7期18卷 843-849页

作者： Wei Tao a,*, Zhengkang Shena,b a State Key laboratory of Earthquake Dynamics, institute of Geology, China Earthquake Administration, Beijing 100029, China b department of Earth and Space Sciences, University of California, Los Angeles, CA 90095-1567, USA State Key laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Beijing 100029 China department of Earth and Space Sciences University of California Los Angeles CA 90095-1567 USA

Using a compilation of 6980 heat flow measurements, we produce a new heat flow map for the Chinese continent and its adjacent areas. We develop an objective and integrated method to interpolate the heat flow data, taking into account both the uniformity within geological units and coherency of regional heat flow. The geologic units are outlined based on Zhang et al.’s active tectonic block model. Our heat flow model is presented in two formats: a contour map and a heat flow dataset with values on a 1×1° grid for the Chinese continent and its adjacent areas, reflecting detailed variations in some regions. Also provided is a resolution map which helps understand the reliability of the heat flow model. Our results reveal that (1) Heat flows in the eastern part of the Chinese continent are relatively higher than those in the western part except that in the Tibetan Plateau area. (2) Heat flows in the Ordos and North China blocks are around 60 mW/m2, and are 50–55 mW/m2 in South China except for the continental marginal sea regions. (3) Heat flow is the lowest in the Junggar Basin, only 35–45 mW/m2, and is 45–55 mW/m2 in the Tarim Basin. The results of this study provide an important data- set for studies on thermal and rheological structures of the Chinese continent and its adjacent areas.

关键词： Heat flow Chinese continent and its adjacent areas Geological units Contour map Resolution map