基于组合评价模型的分析

摘 要: 本文界定了现代服务业的范围, 采用层次分析的方法建立了现代服务业综合实力的评价指标体系, 并且利用 层次分析法和因子分析法, 确定了各评价指标的权重。据此对我国各省市 2005 年现代服务业的综合实力进行了评价, 并提 出了发展现代服务业的建议。Abstr act: This paper defines the scope of modern service industry and establishes a system of evaluation index for the com- prehensive strength of modern service industry with the method of AHP. Moreover, it has determined the weight of each index in the system by using the methods of AHP and factor analysis. Accordingly, we evaluate the comprehensive strength of modern ser- vice industry in China's various provinces and cities in 2005 and put forward some suggestions for the development of modern service industry

A Novel Sesquiterpene Glucoside from Trichoderma sp. PT2

从海藻真菌木霉TrICHOdErMA SP.PT2菌体提取物中分离到一个新倍半萜糖苷类化合物TrICHOdErMOSIdE(1)。并通过1d-,2d-nMr波谱数据鉴定了化合物的结构,并应用MTT法对化合物1的细胞毒活性进行了研究。A novel sesquiterpene glucoside,trichodermoside(1),was isolated from the mycelia extract of algicolous fungus Trichoderma sp.PT2.The structure was elucidated by spectroscopic analyses,including 1D-,2D-NMR data and mass-spectrometric analyses.Compound 1 displayed weak growth inhibition against human HeLa cells.supportedbyChinaOceanResourceR&DAssociation(GrantDYXM-115-02-2-13);theNationalHighTechnologyResearchandDevelopmentProgramofChina(863;No.2006AA09Z410

Comparative Study on Comprehensive Strength of Inter-regional Modern Service Industry in China——Based on the Analysis of Combined Evaluation Models

本文界定了现代服务业的范围,采用层次分析的方法建立了现代服务业综合实力的评价指标体系,并且利用层次分析法和因子分析法,确定了各评价指标的权重。据此对我国各省市2005年现代服务业的综合实力进行了评价,并提出了发展现代服务业的建议。This paper defines the scope of modern service industry and establishes a system of evaluation index for the comprehensive strength of modern service industry with the method of AHP.Moreover,it has determined the weight of each index in the system by using the methods of AHP and factor analysis.Accordingly,we evaluate the comprehensive strength of modern service industry in China's various provinces and cities in 2005 and put forward some suggestions for the development of modern service industry

Numerical simulation on solid-liquid two-phase flow in cross fractures

This paper presents a series of numerical simulation on solid-liquid two-phase flow in cross fractures based on the Two-Fluid Model and the kinetic theory of granular flow (KTGF). First, the model is validated by previous experimental data. Second, the dimensionless controlling parameters are derived to describe the particle-laden flow in cross fractures, including the angle between the main and branch slots (bypass angle) theta, inlet particle volume fraction alpha(s0), the ratio of particle size to branch slot width d(s)/w(b), the Archimedes number Ar and the Reynolds number Re. Third, the effects of the dimensionless parameters are investigated. The results show that particles tend to accumulate at the intersection between the main slot and the branch slot. Larger bypass angle between the main slot and branch slot leads to less particle&#39;s flow into the branch slot. The distance of the branch fracture from the inlet of the main fracture induces different particle-flow characteristics into the branch slot. Particle volume fraction at the stable stage increases with the decrease of d(s)/w(b). The deposition thickness of particles increases with the increase of the inlet volume fraction and Ar number, while decreases with the increase of Re number. (C) 2018 Elsevier Ltd. All rights reserved.</p

Dissociation equilibrium height and friction coefficient in pipeline transportation of gas hydrate-bearing sediment particles

Compared with traditional fossil fuels, gas hydrates have vast reserves, cause little pollution, and are an essential strategic energy resource. Pipeline transportation is critical to realize the development and utilization of natural gas hydrate resources. The Eulerian multiphase flow model within the computational fluid dynamics software FLUENT was employed to calculate gas-liquid-solid flow, taking into account phase interactions, heat transfer, and collision among particles. Pipeline transportation of gas hydrate-bearing sediment (GHBS) particles was studied based on dimensional analysis and numerical simulation. First, the essential dimensionless numbers controlling multiphase flow and hydrate dissociation were deduced. Further, the obtained simulation results clearly indicate that when the system was in a stable state, there was a dissociation equilibrium height above which hydrate dissociated completely. The influences of the dimensionless numbers on the dissociation equilibrium height and friction coefficient in the pipe were determined, and power-law correlations for the dissociation equilibrium height and friction coefficient were obtained from the numerical data. Finally, an analytical expression of dissociation equilibrium height was derived by decoupling the solid-liquid flow and gas hydrate dissociation, and the validity of the power-law correlation for the dissociation equilibrium height was verified by the analytical expression

SCALING BEHAVIORS OF CHF IN POOL BOILING ON THIN PLATINUM WIRES

本文实验研究了地面重力环境中过冷度和加热铂丝直径对FC-72和丙酮池沸腾传热临界热流现象的影响. 实验结果表明,临界热流具有明显的尺度效应,其特征随Bond数范围的不同而不同,但具体的分区准则依赖于工质的物性. 在中等和大的Bond数区域,过冷度对临界热流的影响与铂丝直径无关;而在小Bond数区域,过冷度效应与尺度明显相

Origin of Thermocapillary Convection in Pool Boiling

针对微重力条件下单组份液体池沸腾现象，探讨了有关热毛细效应作用及其成因的不同观点，指出正确描述气液相变界面两侧的温度关系是解决争议的关键．详细评述了现有的气液相变界面温度模型，发现气液相变的非平衡特征会导致气液界面上产生温度梯度，引起表面张力的显著差异，从而驱动热毛细对流的形成．但现有气液相变界面温度模型机理差异迥然，预测结果也差别很大，因此，需要更深入研究

天然气水合物开采方法的研究综述

天然气水合物(简称水合物)是天然气(主要成分甲烷)和水在高压和低温条件下形成的类冰固体化合物.我国将水合物开采研究归入战略发展规划.本文首先介绍水合物地层成藏和分类以及适合大规模商业化开采的地区;然后系统地总结了当前提出的水合物开采方法和适用条件,重点介绍了机械-热联合开采水合物方法的工艺流程和基本科学原理;阐述了水合物开采涉及的热传导、相变、渗流和应力变化4个效应,说明了水合物开采过程中各个物理量演化的特征,作为水合物开采与相关监测的理论基础;最后分析了国内外现场试验性开采的研究进展,并指出了未来水合物开采的研究方向