检索结果-南通市图书馆

Chinese Physics Letters 1998年第3期15卷 221-222页

作者： hu ping Institute of Solid State Physics Sichuan Normal UniversityChengdu 610068

The optical and electron paramagnetic resonance spectra of Cr^(3+) ions in the α-LilO_(3) crystal are explained based on the complete diagonalization procedure and a crystal-field-like *** results agree well with exp... 详细信息

关键词： crystal Electron explained

Degenerate cascade fluorescence: Optical spectral-line narrowing via a single microwave cavity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第6期30卷 346-358页

作者： Liang hu Xiang-Ming hu Qing-ping hu College of Physical Science and Technology Central China Normal UniversityWuhan 430079China

For a three-level atom, two nondegenerate(even microwave and optical) electric dipole transitions are usually allowed;for either of these, the fluorescence spectra are well-described in terms of spontaneous transitions from a triplet of dressed sublevels to an adjacent lower-lying triplet. When the three dressed sublevels are equally spaced from each other, a remarkable feature known as degenerate cascade fluorescence takes place, which displays a five-peaked structure. We show that a single cavity can make all the spectral lines extremely narrow, whether they arise from cavity-coupled or cavity-free transitions. This effect is based on intrinsic cascade lasing feedback and makes it possible to use a single microwave cavity(even a bad cavity) to narrow the spectral lines in the optical frequency regime.

关键词： resonance fluorescence narrow spectral lines microwave cavity

Assumed stress quasi-conforming triangular element for couple stress theory

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2017年第4期30卷 335-344页

作者： Changsheng Wang Xiangkui Zhang ping hu School of Automotive Engineering State Key Laboratory of Structural Analysis for Industrial EquipmentDalian University of Technology

In this paper, a 3-node triangular element for couple stress theory is proposed based on the assumed stress quasi-conforming method. The formulation starts from polynomial approx- imation of stresses. Then the stress-function matrix is treated as the weighted function to weaken the strain-displacement equations. Finally, the string-net functions are introduced to calculate strain integration and the stress smooth technique is adopted to improve the stress accuracy. Numerical results show that the proposed new model can pass the Co- 1 patch test with excellent precision, does not exhibit extra zero energy modes and can cap- ture the scale effects of microstructure.

关键词： Quasi-conforming Couple stress theory Fundamental analytical solutions

Low/distortion on Exterior Surface of Auto Body and Its Correction Method

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2012年第2期25卷 299-305页

作者： hu ping BAO Jingru ZHAO Kunmin School of Automotive Engineering Dalian University of TechnologyDalian 116024China

Surface low/distortion is one of the most challenging surface deflections that have a great effect on the exterior appearance of *** studies on surface distortion/deflection have focused on evaluation and visualization techniques,the research work on correction or prevention of surface low/distortion is limited,and there is no perfect surface low/distortion corrective method that can satisfy the needs of the engineering.A B-spline based geometry morphing algorithm is proposed and then a new program based on UG-NX platform is developed to modify the die face in the surface low/distortion *** verify this developed system,the experimental dies that can replicate the surface low/distortion phenomenon successfully is put to *** geometric variables are introduced to describe the basic geometry of typical depression features of automotive outer *** experimental dies are then designed to reflect various combinations of these geometric *** stamping experiments are conducted on cold rolled grade 5（CR5） sheet steel and various static measurements,such as oil-stoning,laser scanner,etc,are performed to measure and record the surface low/*** approaches including good bearing,holds in blank and die face morphing that aim to correct low/distortions are tried out and surface low/distortions are observed in the specimen with reverse draw depth of 10 *** measurement results show that die morphing is a practical and effective method to correct the surface low/*** correction method proposed can be used to minimize the occurrence of surface low/distortion in die manufacturing,which has certain reference significance to the correction of surface low/distortion.

关键词： sheet metal forming surface low/distortion surface deflection corrective method morphing algorithm

Low-dimensional perovskite modified 3D structures for higher-performance solar cells

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第6期81卷 389-403,I0009页

作者： Lili Gao ping hu Shengzhong(Frank)Liu College of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi'an 710055ShaanxiChina Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023LiaoningChina School of Materials Science and Engineering Shaanxi Normal UniversityXi’an 710119ShaanxiChina

For solution prepared perovskite solar cells,metal halide perovskite materials with low-dimensional(LD)are flexibly employed in 3D perovskite solar cells to promote efficiency and long-term *** this review,the various structures,properties,and applications of LD perovskites are firstly summarized and *** take advantage of LD materials,LD perovskites are introduced in the 3D bulk and/or the interface between the perovskite thin film and the carrier transporting layer to passivate the gain boundary defects while providing the stability advantage of LD ***,the preparation methods and crystallization control of the LD perovskite layers are discussed in ***,the combined devices using both LD and 3D components are reviewed on the basis of device design,cell structure,interface charge transfer,energy lever alignment,and synergistic improvement of both efficiency and ***,the challenges and expectations are speculated for further development of perovskite solar cells.

关键词： Low-dimensional Structure Perovskite solar cell Efficiency Service stability

Carbon nanomaterials： controlled growth and field-effect transistor biosensors

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2012年第1期6卷 26-46页

作者： Xiao-Na WANG ping-An hu Key Laboratory of Micro-systems and Micro-structures Manufacturing(Ministry of Education) Harbin Institute of TechnologyHarbin 150080China Micro/Nano Technology Research Center Harbin Institute of TechnologyHarbin 150080China

Carbon nanostructures, including carbon nanotubes （CNTs） and gra- phene, have been studied extensively due to their special structures, excellent electrical properties and high chemical stability. With the development of nanotechnology and nanoscience, various methods have been developed to synthesize CNTs/graphene and to assemble them into microelectroniclsensor devices. In this review, we mainly demon- strate the latest progress in synthesis of CNTs and graphene and their applications in field-effect transistors （FETs） for biological sensors.

关键词： carbon nanotube (CNT) graphene preparation field-effect transistor(FET) biosensor

18-DOF Triangular Quasi-Conforming Element for Couple Stress Theory

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2016年第6期111卷 473-492页

作者： Xiangkui Zhang ChangshengWang ping hu School of Automotive Engineering State Key Laboratory of Structural Analysis for Industrial EquipmentDalian University of TechnologyDalian 116024P.R.China

The basic idea of quasi-conforming method is that the strain-dis-placement equations are weakened as well as the equilibrium *** this paper,an 18-DOF triangular element for couple stress theory is proposed within the framework of quasi-conforming *** formulation starts from truncated Taylor expansion of strains and appropriate interpolation functions are chosen to calculate strain *** element satisfies C0 continuity with second order accuracy and weak C1 continuity *** examples demonstrate that the proposed model can pass the C0??1 patch test and has high *** element does not exhibit extra zero energy modes and can capture the scale effects of microstructure.

关键词： couple stress theory triangular quasi-conforming element enhanced patch test scale effect

Antitermitic effect of the Lantana camara plant on subterranean termites （Isoptera： Rhinotermitidae）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2010年第5期17卷 427-433页

作者： Wei Ding Xing ping hu College of Plant Protection Southwest University Chongqing China Department of Entomology and Plant Pathology Auburn University Auburn USA

The insecticidal effects of Lantana camara L. （flowers, leaves, stems and roots） and the soil where lantana had been growing, on foraging activity and survival of the subterranean termites Coptotermes formosanus and Reticulitermes flavipes were examined in a 3-week experiment. The soil in which lantana had been growing had no effect on termite tunneling and survival. Incorporation of chipped fresh lantana leaves and stems into soil had no effect on mortality but caused significant reduction in tunneling. The 5-cm wide barrier of soil with lantana tissue incorporated effectively repelled groups of both species from penetrating the barrier and thus prevented infestation of a piece of wood on the other side of the barrier. C. formosanus was more sensitive in avoiding the barrier than R. flavipes. Leaves, stems and flowers were more repellent than roots. These results provide preliminary evidence that fresh-cut lantana leaves, stems and flowers may have use as additives to garden mulches against termites.

关键词： Coptotermesformosanus Lantana camara L. mulch nonchemical control,repellents Reticulitermesflavipes subterranean termites

Evaluation of differential antitermitic activities of Lantana camara oven-dried tissues against Reticulitermes virginicus （Isoptera： Rhinotermitidae）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2011年第6期18卷 671-681页

作者： Zhonglin Yuan Xing ping hu Qingdao Agricultural University Qingdao Shandong Province China Department of Entomology and Plant Pathology Auburn University Auburn Alabama USA

Chemical-treated soil or physical barriers have been the most commonly used approach for termite management. We hypothesized that a barrier of soil incorporated with oven-dried Lantana camara L. tissues could prevent termite infestation. We first examined the antitermitic effects of the dried tissues from two cultivars （＇Mozelle＇ and ＇New Gold＇） on the subterranean termite, Reticulitermes virginicus （Banks）（Isoptera： Rhinotermitidae）. Results show that all of the tissues of Mozelle had greater antitermic activity than corresponding tissues of New Gold, and leaves had greater termiticidal effects than flowers and stems. When termites were exposed to the test materials in a no-choice bioassay, the 24-day test resulted in a significant reduction of survival （52.5%-88.6%）, running speed （18.2%-37.3%）, live weight （21.8%-53.5%） and body water content （33.2%-56.2%） compared to the control. The consumption of leaves and flowers was exiguous. When used as 25% tissue mulch-barrier, the oven-dried lantana tissues decreased termite tunneling and wood consumption and increased termite mortality. The decreased survival, vigor, and low consumption indicate a toxic and anti-feeding property of the materials tested. The results therefore support our hypothesis that the dried lantana tissues possess antitermitic activities.

关键词： antitermitic activity mulch barrier bioassay no-choice bioassay organictermite control oven-dried plant tissues subterranean termite termiticidal toxicity

Comparative Study of 10-MW High-Temperature Superconductor Wind Generator with Overlapped Field Coil Arrangement

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2020年第4期18卷 358-366页

作者： Zai-Qiang Jiang Jiang-ping hu School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731

The electromagnetic characteristics and iron loss of a high-temperature superconductor wind generator(HWG)equipped with an overlapped field coil arrangement(OFCA)are studied by comparing with the one equipped with the conventional field coil arrangement(CFCA).Through a quantitative analysis,it was found that HWG with OFCA exhibits better electromagnetic characteristics than HWG with CFCA and can reduce the iron loss by eliminating the magnetic flux sag caused by the adjacent field coil sides with the same current flow *** addition,the OFCA topology can further reduce the volume of the wind generator.

关键词： High-temperature superconductor(HTS)field coil iron loss magnetic flux sag optimization superconducting wind generator