检索结果-南通市图书馆

Planet host stars in open clusters

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2015年第3期58卷 96-101页

作者： YANG XiaoLing chen YuQin ZHAO Gang Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences

We have compiled a list of all planet host star candidates reported in the literature,which are likely to be cluster members,and we checked their memberships by the spatial location,radial velocity,proper motion and photometric *** found that only six stars,BD-13 2130,HD 28305,Kepler-66,Kepler-67,Pr0201 and Pr0211,are planet orbiting stars in open clusters to *** stars,HD 70573 and HD 89744,belong to moving groups and one star,TYC 8975-2606-1,may not be a planet host star,while three stars,HD 16175,HD 46375 and HD 108874 are not members of open *** note that all these six planetary systems in the stellar cluster environment are younger than^1 Gyr,which might indicate that the planetary system in open cluster can not survive for a long time,and we speculate that close stellar encounters between member stars in open cluster can potentially destroy,or at least strongly affect,the presence of planetary systems.

关键词： extrasolar planets planetary survival open cluster

Analysis of Heat Dissipation in LED with Various Adhesives

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2011年第3期20卷 254-259页

作者： Zi-Gui Huang Zheng-Yu chen Department of Mechanical Design Engineering National Formosa University Huwei Yun-lin Taiwan China

Light-emitting diodes (LEDs) are semiconducting, light producing units, with the advantages of small size, long life, low voltage, reduced energy consumption, and high vibration resistance. Unfortunately, most LED output power is converted into heat, with little converted into optical energy. If the heat is not transferred outward from the unit, the LED will overheat and its light emission efficiency, stability, and lifespan will be reduced. Improving LED heat dissipation has become a hot topic. This paper used the finite element method to discuss the temperature change in LED heat sources, using epoxy and Al2O3 adhesives with varying heat transfer coefficients.

关键词： LED heat dissipation finite element method heat transfer coefficient adhesive

Several three-dimensional solutions for transversely isotropic functionally graded material plate welded with circular inclusion

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2016年第6期37卷 683-694页

作者： Bo YANG Weiqiu chen Haojiang DING Department of Civil Engineering Zhejiang Sci-Tech University State Key Laboratory of CAD & CG Zhejiang University Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Soft Matter Research CenterDepartment of Engineering MechanicsZhejiang UniversityYuquan Campus Department of Civil Engineering Zhejiang University

The problem of a transversely isotropic functionally graded material （FGM） plate welded with a circular inclusion is considered. The analysis starts with the general- ized England-Spencer plate theory for transversely isotropic FGM plates, which expresses a three-dimensional （3D） general solution in terms of four analytic functions. Several analytical solutions are then obtained for an infinite FGM plate welded with a circular inclusion and subjected to the loads at infinity. Three different cases are considered, i.e., a rigid circular inclusion fixed in the space, a rigid circular inclusion rotating about the x-, y-, and z-axes, and an elastic circular inclusion with different material constants from the plate itself. The static responses of the plate and/or the inclusion are investigated through numerical examples.

关键词： plate functionally graded material (FGM) welded circular inclusion,analytical solution

Numerical Investigation of the Thermal Response to Skin Tissue during Laser Lipolysis

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2018年第5期27卷 470-478页

作者： chen Bin ZHANG Yue LI Dong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Laser lipolysis can effectively treat obesity and its associated diseases, such as hypertension, fatty liver, and hyperlipidemia. However, currently available invasive laser lipolysis, which transmits laser to a fiber-optic catheter inserted into the subcutaneous tissue for irradiation through an incision, may cause hematomas, infections, and empyrosis. The current study presents a novel, noninvasive approach for laser lipolysis, which directly irradiates the intact skin surface without an incision and preferentially targets adipose tissue at the near-infrared band. High laser energy is necessary to damage adipocytes; however, this may carbonate and burn the dermis. Therefore, the introduction of skin cooling is essential to avoid unwanted hyperthermal injury and improve the threshold of radiant exposure. In the current study, we investigated a novel noninvasive approach assisted with skin cooling by establishing a homogeneous multi-layer skin model. In this method, light propagation in the skin was simulated by using the Monte Carlo method. Skin cooling was employed before laser irradiation to protect the epidermis from thermal damage, which was treated as a boundary condition based on Newton's law. The numerical results showed that the photons were deposited in the adipose layer more than in the other layers. Laser can effectively destroy adipose tissue at an energy density of >200 J/cm^2 at 1210 nm wavelength, whereas at least 300 J/cm^2 is required at 1064 nm to achieve the same effect. In this experiment, at >5 s pulse width, the selectivity of adipose was not obvious. Moreover, the results indicated that 60 ms R134a or R404a spray can effectively reduce the temperature of the epidermis. R404a exhibited a stronger cooling effect than R134a. Cold air cooling at -10 °C for 10 s could effectively decrease the skin temperature, and deeper cooling could be achieved by cold air cooling compared with cryogen spray cooling.

关键词： laser lipolysis Nd:YAG laser multi-layer skin model skin cooling

Hidden-charm pentaquark states through current algebra:from their production to decay

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2022年第9期46卷 62-93页

作者： Hua-Xing chen School of Physics Southeast UniversityNanjing 210094China

There may be sevenD^((*))Σ_(c)^((*))hadronic molecular *** construct their corresponding interpolating currents and calculate their masses and decay constants using QCD sum *** on these results,we calculate their relative production rates inΛ^(0)_(b)decays using current algebra,that is,B(Λ^(0)_(b)→P_(c)K^(-)):B(Λ^(0)_(b)→P′_(c)K^(-)),where P_(c)and P′_(c)are two different *** also study their decay properties via Fierz rearrangement and further calculate these ratios in the J/ψp mass spectrum,that is,B(Λ^(0)_(b)→P_(c)K^(-)→J/ψpK^(-)):B(Λ^(0)_(b)→P′_(c)K^(-)→J/ψpK^(-)).Our results suggest that theD*Σ^(*)_(c)molecular states of JP=1/2^(-)and 3/2^(-)may be observed in future experiments.

关键词： exotic hadron pentaquark state hadronic molecule interpolating current QCD sum rules current algebra Fierz rearrangement

A data-driven approach for recommending UI element layout

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2020年第9期63卷 61-63页

作者： Yonghao LONG Xiangping chen Yuting XIE School of Information Science and Technology National Engineering Research Center of Digital LifeSun Yat-sen University Guangdong Key Laboratory for Big Data Analysis and Simulation of Public Opinion School of Communication and Design Sun Yat-sen University

Dear editor,Smartphones and tablets with rich graphical user interfaces (GUI) are becoming increasingly popular. GUI design plays an important role in offering a smooth user experience. The complexity of the apps often depends on the user interface (UI)[1]with minor data processing or data processing delegates to the backend component.

关键词： UI development Software mining Layout recommendation Data-driven development Intelligent Software Development

Fast algorithms for singular value decomposition and the inverse of nearly low-rank matrices

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2023年第6期10卷 24-27页

作者： chen Xu Weiwei Xu Kaili Jing Department of Mathematics and Statistics University of Ottawa School of Mathematics and Statistics Xi'an Jiao Tong University School of Mathematics and Statistics Nanjing University of Information Science and Technology

PROBLEM Matrix computation is a fundamental task in science and engineering;it is recognized as one of the seven computational’giants’of massive data analysis [1],analogous to the seven’dwarfs’in highperformance *** recent years,as the scale of datasets rapidly grows,analysts and engineers frequently need to deal with big matrices with a nearly lowrank *** big size of a matrix brings great numerical hurdles to matrix *** this work,we focus on two typical tasks in matrix computation:singular value decomposition (SVD) and matrix inverse on nearly low-rank matrices that are potentially of big sizes.

关键词：

Removal of elemental mercury by KI-impregnated clay

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2016年第2期10卷 236-243页

作者： Boxiong SHEN Jianhong chen Ji CAI School of Energy & Environmental Engineering Hebei University of Technology Tianiin 300401 China College of Environmental Science & Engineering Nankai University Tianjin 30()071 China

This study described the use of clay impreg- nated by KI in gas phase elemental mercury （Hg°） removal in flue gas. The effects of KI loading, temperature, 02, SO2 and H20 on Hg°removal were investigated using a fixed bed reactor. The Hg° removal efficiency of KI-clay with 3% KI loading could maintain at a high level （approxi- mately 80 %） after 3 h. The KI-clay demonstrated to be a potential adsorbent for Hg° removal when compared with activated carbon based adsorbent. 02 was found to be an important factor in improving the Hg° removal. 02 was demonstrated to assist the transfer of KI to I2 on the surface of KI-clay, which could react with Hg° directly. NO and SO2 could slightly improve Hg° removal, while H20 inhibited it greatly. The results indicated that after adsorption, most of the mercury escaped from the surface again. Some of the mercury may have been oxidized as it left the surface. The results demonstrated that the chemical reaction primarily occurred between KI and mercury on the surface of the KI-clay.

关键词： clay elemental mercury removal efficiency,potassium iodide mechanism

Large-scale experimental study on scour around offshore wind monopiles under irregular waves

在线全文

学校读者我要写书评

暂无评论

Water Science and Engineering 2022年第1期15卷 40-46页

作者： Song-gui chen En-yu Gong Xu Zhao Taro Arikawa Xin chen Tianjin Research Institute for Water Transport Engineering Tianjin 300456China College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083China Department of Civil and Environmental Engineering Chuo UniversityTokyo 112-8551Japan

The Keulegan-Carpenter(KC)number is the main dimensionless parameter that affects the local scour of offshore wind power monopile *** study conducted large-scale(1:13)physical model tests to study the local scour shape,equilibrium scour depth,and local scour volume of offshore wind power monopiles under the action of irregular waves with different KC *** experiments were carried out with the KC number ranging from 1.0 to *** a small KC number(KC6),the proposed method better predicted the equilibrium scour depth when the wave *** addition,according to the results of three-dimensional terrain scanning,the relationship between the local equilibrium scour volume of a single offshore wind power monopile and the KC number was *** provided a rational method for estimation of the riprap redundancy for monopile protection against scour.

关键词： Keulegan-Carpenter number Large-scale test Scour hole shape Equilibrium scour depth Local scour hole volume