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a-Si/c-Si heterojunction solar cells on SiSiC ceramic substrates

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Rare Metals 2006年第Z1期25卷 186-189页

作者： li xudong XU Ying CHE Xiaoqi Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China

Silicon thin-film solar cells are considered to be one of the most promising cells in the future for their potential advantages, such as low cost, high efficiency, great stability, simple processing, and none-pollution. In this paper, latest progress on poly-crystalline silicon solar cells on ceramic substrates achieved by our group was reported. Rapid thermal chemical vapor deposition (RTCVD) was used to deposited poly-crystalline silicon thin films, and the grains of as-grown film were enlarged by Zone-melting Recrystallization (ZMR). As a great change in cell′s structure, traditional diffused pn homojunction was replaced by a-Si/c-Si heterojunction, which lead is to distinct improvement in cell′s efficiency. A conversion efficiency of 3.42% has been achieved on 1 cm2 a-Si/c-Si heterojunction solar cell (Isc=16.93 mA, Voc=310.9 mV, FF=0.6493, AM=1.5 G, 24 ℃), while the cell with diffused homojunction only got an efficiency of 0.6%. It indicates that a-Si emitter formed at low temperature might be more suitable for thin film cell on ceramics.

关键词： a-Si/c-Si heterojunction thin film solar cell ceramic substrate

Risks,challenges and strategies of power systems against the background of carbon neutrality

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Clean Energy 2023年第4期7卷 767-782页

作者： Qingbo Tan xudong li Yan liang CITI University of Mongolia 999097-15141 UlaanbaatarMongolia North China Electric Power University 102206 BeijingChina Economics and Technology Research Institute of State Grid Shanxi Electric Power Company 030000 TaiyuanChina

Building a new power system with new energy as the main body is an important means of achieving the goal of carbon *** with the traditional power system,the new power system has great changes and challenges in its safety mechanism and balance *** on this,this paper focuses on the changes in the characteristics,functions and technologies of the new power system from the three sides of the source network and *** this basis,the challenges faced by the high proportion of new-energy power systems are summarized from six aspects:reliability,stability,economy,data intelligence,flexibility and ***,corresponding countermeasures,solutions and suggestions are put forward for the challenges of reliability,stability,economy,data intellectualization,flexibility and synergy,which provide ideas for the power guarantee of the new power system.

关键词： new power system reliability stability economy data intellectualization flexibility synergy

Effects of Dragonfly Wing Structure on the Dynamic Performances

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Journal of Bionic Engineering 2013年第1期10卷 28-38页

作者： Huaihui Ren Xishu Wang xudong li Yinglong Chen Department of Engineering Mechanics AML Tsinghua University Beijing 100084 P. R. China Longyuan (Beijing) Wind Power Engineer Teehnology Co. Ltd Beijing 100034 P. R. China Qingdao Campus of Naval Aeronautical Academy Qingdao 266041 P. R. China

The configurations of dragonfly wings, including the corrugations of the chordwise cross-section, the microstructure of the longitudinal veins and membrane, were comprehensively investigated using the Environmental Scanning Electron Microscopy （ESEM）. Based on the experimental results reported previously, the multi-scale and multi-dimensional models with different structural features of dragonfly wing were created, and the biological dynamic behaviors of wing models were discussed through the Finite Element Method （FEM）. The results demonstrate that the effects of different structural features on dynamic behaviors of dragonfly wing such as natural frequency/modal, bending/torsional deformation, reaction force/torque are very significant. The corrugations of dragonfly wing along the chordwise can observably improve the flapping frequency because of the greater structural stiffness of wings. In updated model, the novel sandwich microstrueture of the longitudinal veins re- markably improves the torsional deformation of dragonfly wing while it has a little effect on the flapping frequency and bending deformation. These integrated structural features can adjust the deformation of wing oneself, therefore the flow field around the wings can be controlled adaptively. The fact is that the flights of dragonfly wing with sandwich microstructure of longitudinal veins are more efficient and intelligent.

关键词： self-adaptivity biomechanics dynamic behavior micromechanics multiscale

Fabrication of Flowerlike Supramolecular Architectures of Fullerene Derivatives Bearing a Small Nitrophenyl Substituent

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Chemical Research in Chinese Universities 2014年第6期30卷 1044-1046页

作者： ZHANG Xuan li xudong MA lixia College of Chemistry Chemical Engineering & Biotechnology Donghua University Shanghai 201620 P. R. China

Flowerlike supramolecular architectures were fabricated from fulleropyrrolidincs bearing a small para-, meta-, or ortho-nitrophenyl group. The self-assembled architectures were characterized by scanning electron micro-scopy（SEM） and X-ray diffraction（XRD）. It was found that these flowerlike architectures were assembled from na- noplatcs that formed from fundamental subunit of interdigitated lamellar bilayer structure.

关键词： Fullerene: Self-assembly: Flowerlike architecture

Quantification of anaerobic ammonium-oxidizing bacteria in enrichment cultures by quantitative competitive PCR

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Journal of Environmental Sciences 2009年第11期21卷 1557-1561页

作者： HAO Chun WANG Huan liU Qinhua li xudong Chengdu Institute of Biology Chinese Academy of Sciences Chengdu 610041 China Graduate University of the Chinese Academy of Sciences Beijing 100039 China

The anaerobic ammonium-oxidizing （ANAMMOX） bacteria were enriched from a sequencing batch biofilm reactor （SBBR）. A quantitative competitive polymerase chain reaction （QC-PCR） system was successfully developed to detect and quantify ANAMMOX bacteria in environmental samples. For QC-PCR system, PCR primer sets targeting 16S ribosomal RNA genes of ANAMMOX bacteria were designed and used. The quantification range of this system was 4 orders of magnitude, from 10^3 to 10^6 copies per PCR, corresponding to the detection limit of 300 target copies per mL. A 312-bp internal standard was constructed, which showed very similar amplification efficiency with the target amxC fragment （349 bp） over 4 orders of magnitude （10^3-10^6）. The linear regressions were obtained with R^2 of 0.9824 for 10^3 copies, 0.9882 for 10^4 copies, 0.9857 for 10^5 copies and 0.9899 for 10^6 copies, respectively. Using this method, ANAMMOX bacteria were quantified in a shortcut nitrification/denitrification-anammox system which was set for piggery wastewater treatment.

关键词： anaerobic ammonium oxidation 16S rRNA approach quantitative competitive PCR

Flowfield characteristics in sidewall compression inlets

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Acta Mechanica Sinica 2020年第3期36卷 678-685页

作者： Gaoxiang Xiang Xiang Gao Xuzhen Jie xudong li Haoyang li Xiaopeng Chen School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710129China College of Geology and Environment Xi'an University of Science and TechnologyXi'an 710000China Beijing Institute of Aerospace Long March Vehicle Beijing 100076China

In this work,the flow fields in three-dimensional(3D)sidewall compression inlets are investigated theoretically and *** spatial dimension reduction theory with the shock dynamics theory,a detailed analysis of the flowfield in the compression part of an inlet is *** this analytical approach,wave configurations are determined and flowfield parameters are solved;numerical simulations are conducted to validate these theoretical *** effects of the attack angle and yaw angle on the pressure ratio,wave structures,and total pressure recovery performance are discussed in *** offer an effective way to study shock/shock interaction(SSI)in sidewall inlets,which is essential to the designing of such inlets.

关键词： Hypersonic flow Shock/shock interaction Flowfield characteristics

Human gut microbiota： the links with dementia development

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Protein & Cell 2017年第2期8卷 90-102页

作者： Rashad Alkasir Jing li xudong li Miao Jin Baoli Zhu Institute of Microbiology Chinese Academy of Sciences Beijing 100101 China China-Japan Friendship Hospital Beijing 100029 China Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases The First Attainted Hospital College of Medicine Zhejiang University Hangzhou 310058 China

Dementia is a comprehensive category of brain diseases that is great enough to affect a person＇s daily functioning. The most common type of dementia is Alzheimer＇s disease, which makes most of cases. New researches indicate that gastrointestinal tract microbiota are directly linked to dementia pathogenesis through triggering metabolic diseases and low-grade inflammation progress. A novel strategy is proposed for the management of these disorders and as an adjuvant for psychiatric treatment of dementia and other related diseases through modulation of the microbiota （e.g. with the use of probiotics）.

关键词： dementia alzheimer's disease gut microbiota inflammation probiotics

Numerical study on the effect of in-situ stress on smoothwall blasting in deep tunnelling

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Underground Space 2023年第4期11卷 96-115页

作者： xudong li Kewei liu Jiacai Yang Yanyan Sha Ruitao Song School of Resources and Safety Engineering Central South UniversityChangsha 410083China Department of Mechanical and Structural Engineering and Materials Science University of StavangerStavanger 4021Norway

In the present study,a numerical model is first calibrated against the crack networks and pressure attenuation data in laboratory blasting ***,based on the calibrated numerical model,two-hole plane models are developed and used to perform a series of sim-ulations of smoothwall blasting in deep tunnelling subjected to in-situ *** evolutions of rock fracture and excavation damage zone in the roof/floor and sidewalls under different far-field hydrostatic pressure and anisotropic in-situ stress conditions are numerically *** findings in numerical modelling are also analytically interpreted with the stress distributions around the designed tunnel perimeter and perimeter *** numerical and analytical results show that the variations of rock cracking and excavation dam-aged zone induced by smoothwall blasting with in-situ stress are mainly attributed to the high tangential compressive stress concentration around the remaining rock after inner primary blasts and the tensile stress acting on the wall of perimeter hole,which control the crack propagation and initiation *** last,the implications of findings for practical smoothwall blasting in deep tunnelling are discussed.

关键词： Smoothwall blasting In-situ stress Crack propagation Excavation damaged zone Stress distribution Numerical simulation

Exploiting the potential of the ubiquitin-proteasome system in overcoming tyrosine kinase inhibitor resistance in chronic myeloid leukemia

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Genes & Diseases 2024年第5期11卷 140-162页

作者： xudong li Wei li Yanli Zhang linping Xu Yongping Song Department of Hematology Affiliated Cancer Hospital of Zhengzhou University and Henan Cancer HospitalZhengzhouHenan 450008China Academy of Medical Sciences Zhengzhou UniversityZhengzhouHenan 450052China Department of Hematology The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan 450052China

The advent of tyrosine kinase inhibitors(TKI)targeting BCR-ABL has drastically changed the treatment approach of chronic myeloid leukemia(CML),greatly prolonged the life of CML patients,and improved their ***,TKI resistance is still a major problem with CML patients,reducing the efficacy of treatment and their quality of *** resistance is mainly divided into BCR-ABL-dependent and BCR-ABL-independent ***,the main clinical strategy addressing TKI resistance is to switch to newly developed ***,data have shown that these new drugs may cause serious adverse reactions and intolerance and cannot address all resistance ***,finding new therapeutic targets to overcome TKI resistance is crucial and the ubiquitin-proteasome system(UPS)has emerged as a *** UPS mediates the degradation of most proteins in organisms and controls a wide range of physiological *** recent years,the study of UPS in hematological malignant tumors has resulted in effective treatments,such as bortezomib in the treatment of multiple myeloma and mantle cell *** CML,the components of UPS cooperate or antagonize the efficacy of TKI by directly or indirectly affecting the ubiquitination of BCR-ABL,interfering with CML-related signaling pathways,and negatively or positively affecting leukemia stem *** of these molecules may help overcome TKI resistance and treat *** this review,the mechanism of TKI resistance is briefly described,the components of UPS are introduced,existing studies on UPS participating in TKI resistance are listed,and UPS as the therapeutic target and strategies are discussed.

关键词： Chronic myeloid leukemia Deubiquitinases E3 ligase PROTAC TKI resistance Ubiquitin-proteasome system