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Search Results: 1 - 10 of 20170 matches for " Ye Pan "
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Evaluation of Venture Capital Based on Evaluation Model  [PDF]
Hengqing Tong, Yichao Pan, Yang Ye, Shudan Lu, Hengwen Liu
Technology and Investment (TI) , 2010, DOI: 10.4236/ti.2010.13023
Abstract: This paper studies evaluation problem in venture capital. Based on the venture capital and the actual evaluation work, we use an evaluation model proposed by us to evaluate the profitability of enterprises. We establish the impact of investment income and investment risk index system, corresponding to get observational data of the second order indexes. Evaluation model is a kind of generalized linear regression model with convex constraint, in which the dependent variable is unknown and regression coefficients all are calculated in accordance with samples instead of the prior designated. The least squares estimation of the model is given by the interactive projection algorithm between the convex sets, so as to provide a new analysis method for venture capital evaluation index system.
Analysis of Quality of Life in Cancer Patients by Structural Equation Model  [PDF]
Hengqing Tong, Shudan Lu, Yang Ye, Yichao Pan
Journal of Cancer Therapy (JCT) , 2010, DOI: 10.4236/jct.2010.12012
Abstract: Many people have been dead of cancer. The life quality of patients with cancer has aroused great concern from the public and specialists. In this paper, an index system of life quality is proposed to evaluate the quality of life, which includes 6 first-level indexes and 34 second-level indexes. Then, a structural equation model (SEM) based on these in-dexes and relationships among them is constructed for the analysis of quality of life in cancer patients. Furthermore, we offer a definite linear algorithm for the calculation of SEM. This method is more objective and scientific compared with traditional methods, such as descriptive analysis, some simple test methods and so on.
Analysis and Evaluation for Core Competence of Insurance Company Based on SEM  [PDF]
Hengqing Tong, Yang Ye, Yichao Pan, Shudan Lu, Jie Zhang
iBusiness (IB) , 2010, DOI: 10.4236/ib.2010.22021
Abstract: Evaluation the core competence reasonably plays an important role in the insurance company, it is related to whether the insurance can maintain a stable long-term competitive advantage or not, and whether obtain a stable long-term excess profits or not. In this paper, we select 6 first-degree indexes (including the core competence) and 28 second-degree indexes to evaluate the core competence of insurance company by Structural Equation Model (SEM), and analysis the relationships among the first-degree indexes. Besides, we use a new algorithm proposed by us to improve the calculation of SEM.
Sb-Mn Alloy in-situ Composites and Magnetic Properties
Ye PAN,Guoxiong SUN,

材料科学技术学报 , 2001,
Abstract: The microstructures and magnetic properties of two in-situ composites, directionally solidified Sb-9.5%Mn and Sb-50%Mn alloys, were investigated. The aligned ferromagnetic compound MuSb or Mn2Sb was embedded in Sb or Mn matrix with varying Mn content. The magnetization curves and thermal magnetic Curves were examined along solidification direction, which reveals the magnetic behaviors of the composites.
In-situ observation of porosity formation during directional solidification of Al-Si casting alloys
Zhao Lei,Pan Ye,Liao Hengcheng
China Foundry , 2011,
Abstract: In-situ observation of porosity formation during directional solidification of two Al-Si alloys (7%Si and 13%Si) was made by using of micro-focus X-ray imaging. In both alloys, small spherical pores initially form in the melt far away from the eutectic solid-liquid (S/L) interface and then grow and coagulate during solidification. Some pores can float and escape from the solidifying melt front at a relatively high velocity. At the end of solidification, the remaining pores maintain spherical morphology in the near eutectic alloy but become irregular in the hypoeutectic alloy. This is attributed to different solidification modes and aluminum dendrite interactions between the two alloys. The mechanism of the porosity formation is briefly discussed in this paper.
Study on Noise Prediction and Reduction in Coupled Workshops Using SEA Method
Ye Lei,Jie Pan,Meiping Sheng
ISRN Mechanical Engineering , 2011, DOI: 10.5402/2011/984253
Abstract: A theoretical model for predicting noise reduction in coupled workshops is presented by using statistical energy analysis (SEA) method. An opening between the coupled workshops is considered into the theoretical model properly. The leakage issue is dealt with in the process of SEA modeling. An experiment is also carried out. A reasonable agreement between the prediction of noise reduction and the experimental data is observed. Moreover, it is concluded from the simulations that the sound energy transmit through the opening was the most important way to affect the noise reduction and the leakage is a significant element to influence the effect of noise treatment. 1. Statement of the Problem The noise exposure standard of workplace in Australia is that the average exposure is 85?dB(A) in the form of overall sound pressure level over an eight-hour working day [1]. This regulation does not mean that below 85?dB(A) is safe, but that an eight-hour exposure of 85?dB(A) is considered to represent an acceptable level of risk to human hearing health. It is stated that if the noise level exceeds the regulation, action must be taken immediately. The investigated object in this paper is large coupled workshops, having a pump in one of them used for providing motility for water circulation, a double configured plasterboard placed in the middle of the workshops, and an opening beyond the plasterboard. When the pump runs, people in the receiving room feel so noisy that they cannot work efficiently and comfortably. Therefore, acoustical responses in both workshops and noise reduction between them should be assessed. If the overall sound pressure level exceeds 85?dB(A), noise treatment either on the noisy source, or on the propagation route should be carried out. In order to guide the noise treatment work, the effect of noise reduction after control also needs to be estimated. The configuration of the coupled workshops is shown in Figure 1. The left subfigure is the coupled workshops. The length of both room volumes is 15?m. The right subfigure describes the detailed configuration in the middle?of coupled workshops, including an opening and double plasterboards. The plasterboards are fixed by screw and metal stud frame. Some rayon material fills the air gap between the plasterboards. Figure 1: The configuration of the coupled workshops. 2. Literature Review In practical project, various requirements need to be considered in the process of constructing buildings, thereby, no architecture can be built perfectly. Under the desire of better habitation and working
A Novel Protection and Utilization Pattern for Urban Wetland—As an Example of Hemu Wetland in Hangzhou, China  [PDF]
Nongnong Shi, Minger Ye, Tongfei Lai, Zhiming Yu, Yunli Pan, Mengying Yu, Xiaoqi Zhou
Journal of Water Resource and Protection (JWARP) , 2015, DOI: 10.4236/jwarp.2015.74024
Abstract: This paper proposes an innovative plan and its implement strategy of Hemu urban wetland. The plan takes into consideration its historical background and current status, its protection significance, strategies, solutions and support conditions. It highlights the landscape characteristics of rivers and lakes, and restores its historical flood prevention functions and climate regulation for the city. Especially, this paper proposes to achieve the restoration of “Mulberry-sided Fish Pond” farming style—an important agricultural heritage created by the ancestors inside the wetland, which is a unique and creative way to use low land for ecological agriculture and cycling economy. The proposed wetland sewage treatment schemes would be of practical importance to improve and enhance the ecological environment and promote the construction of ecological civilization in the region. The “Two zones—One block and Three complexes” protection and utilization plan is reasonable and feasible. It fully presents the functions of the wetland for its production, living, life forms and ecology, and is characterized by joint protection of the wetland by original residents and social public. This will result in active, instead of passive, wetland protection, like turning a “blood transfusion protection” to “hematopoietic protection”, which reflects the sustainable development. The paper offers valuable information and strategies for planning and development of urban wetland.
Neutrino and anti-neutrino transport in accretion disks
Zhen Pan,Ye-Fei Yuan
Physics , 2012, DOI: 10.1103/PhysRevD.85.064004
Abstract: We numerically solve the one dimensional Boltzmann equation of the neutrino and anti-neutrino transport in accretion disks and obtain the fully energy dependent and direction dependent neutrino and anti-neutrino emitting spectra, under condition that the distribution of the mass density,temperature and chemical components are given. Then, we apply the resulting neutrino and anti-neutrino emitting spectra to calculate the corresponding annihilation rate of neutrino pairs above the neutrino dominated accretion disk and find that the released energy resulting from the annihilation of neutrino pairs can not provide sufficient energy for the most energetic short gamma ray bursts whose isotropic luminosity can be as high as $10^{52}$ ergs/s unless the high temperature zone where the temperature is beyond 10 MeV can stretch over 200 km in the disk. We also compare the resulting luminosity of neutrinos and anti-neutrinos with the results from the two commonly used approximate treatment of the neutrino and anti-neutrino luminosity: the Fermi-Dirac black body limit and a simplified model of neutrino transport, i.e., the gray body model, and find that both of them overestimate the neutrino/anti-neutrino luminosity and their annihilation rate greatly. Additionally, as did in Sawyer (2003), we also check the validity of the two stream approximation, and find that it is a good approximation to high accuracy.
Vertical Structure of Neutrino Dominated Accretion Disks and Neutrino Transport in the disks
Zhen Pan,Ye-Fei Yuan
Physics , 2012, DOI: 10.1088/0004-637X/759/2/82
Abstract: We investigate the vertical structure of neutrino dominated accretion disks by self-consistently considering the detailed microphysics, such as the neutrino transport, vertical hydrostatic equilibrium, the conservation of lepton number, as well as the balance between neutrino cooling, advection cooling and viscosity heating. After obtaining the emitting spectra of neutrinos and antineutrinos by solving the one dimensional Boltzmann equation of neutrino and antineutrino transport in the disk, we calculate the neutrino/antineutrino luminosity and their annihilation luminosity. We find that the total neutrino and antineutrino luminosity is about $10^{54}$ ergs/s and their annihilation luminosity is about $5\times10^{51}$ ergs/s with an extreme accretion rate $10 M_{\rm {sun}}$/s and an alpha viscosity $\alpha=0.1$. In addition, we find that the annihilation luminosity is sensitive to the accretion rate and will not exceed $10^{50}$ ergs/s which is not sufficient to power the most fireball of GRBs, if the accretion rate is lower than $1 M_{\rm {sun}}$/s. Therefore, the effects of the spin of black hole or/and the magnetic field in the accretion flow might be introduced to power the central engine of GRBs.
Near-Infrared Spectroscopy Combined with Absorbance Upper Optimization Partial Least Squares Applied to Rapid Analysis of Polysaccharide for Proprietary Chinese Medicine Oral Solution  [PDF]
Jiexiong Su, Xinkai Gao, Lirong Tan, Xianzhao Liu, Yueqing Ye, Yifang Chen, Kaisheng Ma, Tao Pan
American Journal of Analytical Chemistry (AJAC) , 2016, DOI: 10.4236/ajac.2016.73025
Abstract: Near-infrared (NIR) spectroscopy was applied to reagent-free quantitative analysis of polysaccharide of a brand product of proprietary Chinese medicine (PCM) oral solution samples. A novel method, called absorbance upper optimization partial least squares (AUO-PLS), was proposed and successfully applied to the wavelength selection. Based on varied partitioning of the calibration and prediction sample sets, the parameter optimization was performed to achieve stability. On the basis of the AUO-PLS method, the selected upper bound of appropriate absorbance was 1.53 and the corresponding wavebands combination was 400 - 1880 & 2088 - 2346 nm. With the use of random validation samples excluded from the modeling process, the root-mean-square error and correlation coefficient of prediction for polysaccharide were 27.09 mg·L-1 and 0.888, respectively. The results indicate that the NIR prediction values are close to those of the measured values. NIR spectroscopy combined with AUO-PLS method provided a promising tool for quantification of the polysaccharide for PCM oral solution and this technique is rapid and simple when compared with conventional methods.
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