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Temperature Field for Improving Internal Quality of Stretched Round Billet

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Journal of Iron and Steel Research International 2009年第6期16卷 17-22页

作者： qiu ping xiao Hong Mechanical Engineering College Yanshan University Qinhuangdao 066004 Hebei China

Based on the rigid-plastic theory, using a coupled thermomechanical model, the stretching process of a circular section billet is simulated by means of FEM software Deform-2D. Through the distribution of internal stress fields of stretched round billet, it is found that the shear stress field is the main factor to induce Mannesmann＇s effect. The simulation results show that a reasonable distribution of the temperature field may improve the internal quality of the circular section billet in the stretching process.

关键词： stretching temperature field Mannesmann's effect simulation

运脾滋阴法-肠润方治疗脾虚气弱型慢传输型便秘的临床疗效

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吉林医学 2024年第8期45卷 1895-1899页

作者：魏晓玲洪燕秋肖秋平林金荣福建中医药大学附属厦门中医院福建厦门361009 厦门市盆底动力学重点实验室

目的:观察滋阴运脾法-肠润方治疗脾虚气弱型慢传输型便秘(STC)患者的临床疗效。方法:选取60例脾虚气弱型STC患者为研究对象,随机分为对照组和观察组各30例,最终纳入研究对照组27例,观察组28例。观察组口服滋阴运脾法-肠润方,1剂/d。对... 详细信息

目的:观察滋阴运脾法-肠润方治疗脾虚气弱型慢传输型便秘(STC)患者的临床疗效。方法:选取60例脾虚气弱型STC患者为研究对象,随机分为对照组和观察组各30例,最终纳入研究对照组27例,观察组28例。观察组口服滋阴运脾法-肠润方,1剂/d。对照组口服乳果糖口服液30 ml/次,1次/d。两组疗程均为4周。比较、分析两组治疗前后患者完全自发排便次数(CSBMs)、便秘主要症状评分、中医证候积分及总有效率。结果:观察组总有效率显著高于对照组,差异有统计学意义(P<0.01);治疗后观察组每周CSBMs较对照组升高,便秘主要症状总分较对照组降低,差异有统计学意义(P<0.01);治疗后观察组在排便频率、排便时间、不尽坠胀感、腹胀的评分及中医证候总分均较对照组降低,差异有统计学意义(P<0.05)。结论:滋阴运脾法-肠润方能有效改善STC脾虚气弱证患者的CSBMs、便秘主要症状及脾虚气弱证候,且对CSBMs、便秘主要症状中排便频率、排便时间、不尽坠胀感、腹胀的改善及中医证候中便次减少、便意减少、腹胀满闷、食少纳呆、神疲懒言、便后乏力的改善优于对照组。

关键词：慢传输型便秘滋阴运脾法-肠润方脾虚气弱

Gradient effect of road transportation on economic development in different geomorphic regions

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Journal of Mountain Science 2018年第1期15卷 181-197页

作者： YANG Xue-ting FANG Yi-ping qiu xiao-ping ZHU Fu-biao Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China University of Chinese Academy of Sciences Beijing 100049 China College of Resources and Environment University of Chinese Academy of Sciences Beijing 100190 China

The economic benefits of transport infrastructure investment have been widely ***,the varying influence of road transport development across vertical space has rarely been *** Sichuan province in China as case study area where the landform is diverse and complex,administrative counties were categorized into 4 main types:plain counties,hill counties,mountain counties,and plateau *** statistical data during 2006-2014,theperformanceofeconomic development and transport construction level in the four types of counties are ***,the heterogeneous effect of each grade road on economy was calculated by local regression model(GWR).The results indicate that plain counties largely surpassed the other geomorphic counties in economic development level,while the gradient gap among them was on the ***,distribution of transport infrastructure presented a decreasing trend from the low plain counties to high plateau *** imbalances were mainly reflected in the County road and Village *** the changes of regional gaps,National&Provincial roads and County roads were constantly expanding,whereas the disparity of Village road was slowly narrowing over *** noteworthy was the non-stationary economic influence of traffic factors across vertical *** average,National&Provincial roads generated higher benefits in the high elevation regions than the *** contrast,County road and Village road were found to be more effective in promoting economic development in *** regard to local estimates of traffic factors,coefficients in mountain counties exhibited larger fluctuation ranges than other geomorphic *** conclusions provide a basis for government decisionmaking in a more reasonable construction arrangement of road facilities and sustainable economic development.

关键词： Geomorphic counties Road transportation Economic development Geographically weighted regression Gradient variation

Effects of altitude on county economic development in China

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Journal of Mountain Science 2018年第2期15卷 406-418页

作者： ZHU Fu-biao FANG Yi-ping YANG Xue-ting qiu xiao-ping YU Hu Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China University of Chinese Academy of Sciences Beijing 100049 China College of Resources and Environment University of Chinese Academy of Sciences Beijing 100190 China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Key Laboratory of Regional Sustainable Development Modeling Chinese Academy of Sciences Beijing 100101 China

Mountain regions play an increasingly essential role in global sustainable development, and the related sustainable development issues have attracted increasing attention. There are obvious vertical spatial differentiation phenomena in both natural and socio-eeonomic fields with altitude being a key factor affecting the economic development of mountain regions. However, the exact influence of altitude is still unknown. Based on the county scale, this paper used the gravitational potential energy model to evaluate the effects of altitude on economic development in China. The results indicate that the high-altitude areas were the depression areas of county economic development, and county economic density showed a decreasing trend with the increase of altitude. County economic density respectively decreased by 0.10%, 0.04% and 0.02% with every 1% increase in altitude in 2000, 2005 and 2010. Here we demonstrate that high altitude has negative effect on county economy, although the negative effect presented a downward trend. The results also showed that increasing capital and labor investments could reduce the negative effect of high altitude on county economy. In 2010, with every 1% increase in capital and labor density, county economic density increased by 0.62% and 0.83%, respectively. The effects of altitude were the results of multidimensional factors. The fundamental approach to reduce the negative effects of high altitude is to combine the ecological environment and resources to develop characteristic industries. The construction of infrastructure should be strengthened, which can promote the occurrence of the contra-flow of people, logistics and capital, and promote the balanced development of county economy.

关键词： Mountain region County economy Altitude Vertical differentiation Gravitationalpotential energy Balanced development

Spatial variation of the relationship between transport accessibility and the level of economic development in Qinghai-Tibet Plateau, China

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Journal of Mountain Science 2019年第8期16卷 1883-1900页

作者： YANG Xue-ting qiu xiao-ping FANG Yi-ping XU Yun ZHU Fu-biao Research Center of Sichuan County Economy Development Mianyang Teachers’CollegeMianyang 621000China The faculty Geography Resource Sciences Sichuan Normal UniversityChengdu 610101China Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China School of Economics Hefei University of TechnologyHefei 230009China

As an important component of China’ transportation systems, for a long time, the insufficient performance of transport in QinghaiTibet Plateau(QTP) was a bottleneck restricting the economic growth and social development in this area. Nevertheless, the implementation of the western development strategy has accelerated the preliminary construction of comprehensive transport network since 2000. Due to the large area and significant geographical heterogeneity, there is a growing need to understand the relationship between transportation and economic development based on the perspective of spatial difference. By using GIS-based raster analysis and Geographically Weighted Regression(GWR) model, we investigated the spatial-temporal distribution of highway, railway and airport accessibility, respectively, and estimated the correlation and heterogeneity between transport accessibility and the level of economic development. Results revealed that:(1) Transport accessibility in the QTP improved by 53.38% in the past 15 years, which is specifically embodied in the improvement of both highway and railway.(2) Accessibility presented prominent differentiation in the space, increasing from west to east and reducing with the rise of elevation, specifically, the best accessibility area of the highway is below 4000 m above sea level, while the area with an altitude of over 4000 m has the lowest aviation time cost.(3) In general, the long weighted average time cost to critical transport facilities posed significantly negative effect on county economic growth in QTP, more positively, the adverse effect gradually weakened over time.(4) Obvious heterogeneity exists at the influence of different transport accessibility factors on the level of economic development, reflecting both in the horizontal space and altitudinal belt. Therefore, region-specific policies should be addressed for the sustainable development of transport facilities as well as economy in the west mountain areas.

关键词： Accessibility Raster cost weighted Geographically weighted regression Economic effect Spatial variations

Role of permafrost in resilience of social-ecological system and its spatio-temporal dynamics in the source regions of Yangtze and Yellow Rivers

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Journal of Mountain Science 2019年第1期16卷 179-194页

作者： FANG Yi-ping ZHU Fu-biao YI Shu-hua qiu xiao-ping DING Yong-jian Institute of Mountain Hazards and Environment Chinese Academy of Sciences College of Resource and Environment University of Chinese Academy of Sciences School of Economics Hefei University of Technology School of Geographic Sciences Nantong University College of Geography and Resources Science Sichuan Normal University State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences

Permafrost is one of the key components of terrestrial ecosystem in cold regions. In the context of climate change, few studies have investigated resilience of social ecological system(SER) from the perspective of permafrost that restricts the hydrothermal condition of alpine grassland ecosystem. In this paper, based on the structural dynamics, we developed the numerical model for the SER in the permafrost regions of the source of Yangtze and Yellow Rivers, analyzed the spatial-temporal characteristics and sensitivity of the SER, and estimated the effect of permafrost change on the SER. The results indicate that: 1) the SER has an increasing trend, especially after 1997, which is the joint effect of precipitation, temperature, NPP and ecological conservation projects; 2) the SER shows the spatial feature of high in southeast and low in northwest,which is consistent with the variation trends of high southeast and low northwest for the precipitation, temperature and NPP, and low southeast and high northwest for the altitude; 3) the high sensitive regions of SER to the permafrost change have gradually transited from the island distribution to zonal and planar distribution since 1980, moreover, the sensitive degree has gradually reduced; relatively, the sensitivity has high value in the north and south, and low value in the south and east; 4) the thickness of permafrost active layer shows a highly negative correlation with the SER. The contribution rate of permafrost change to the SER is-4.3%, that is, once the thickness of permafrost active layer increases 1 unit, the SER would decrease 0.04 units.

关键词： Resilience of social ecological system Permafrost Permafrost active layer thickness Structural dynamic equation Source regions of Yangtze and Yellow rivers

Analysis of China's Electricity Price and Electricity Burden of Basic Industries under the Carbon Peak Target before 2030

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 481-491页

作者： Yue qiu Suyang Zhou Wei Gu xiao-ping Zhang School of Electrical Engineering Southeast UniversityNanjingChina School of Electronic Electrical and System EngineeringUniversity of BirminghamU.K.

The Chinese government is deepening reformation of electricity prices during the 14th Five Year Plan period and has set a carbon emission reduction target of reaching carbon peak before *** this context,will the carbon emission target influence electricity pricing and will electricity price influence competitiveness of Chinese main industries are two questions needing to be *** paper compares China's electricity price level with the selected major countries in the world,and four typical industries are selected to evaluate their electricity burden ***,the correlation between residential electricity price and industrial electricity price and the influencing factors is analyzed,from the perspectives of scale,structure and *** to the model obtained by regression analysis,the electricity price level and corresponding residential and industrial electricity burden in 2025 and 2030 are *** Terms-Electricity burden,industrial electricity price,regression analysis,residential electricity price.

关键词： Electricity burden industrial electricity price regression analysis residential electricity price

Thermally Conductive,Healable Glass Fiber Cloth Reinforced Polymer Composite based onβ-Hydroxyester Bonds Crosslinked Epoxy with Improved Heat Resistance

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Chinese Journal of Polymer Science 2024年第5期42卷 643-654,I0009页

作者： Fang Chen xiao-Yan Pang Ze-ping Zhang Min-Zhi Rong Ming-qiu Zhang Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education GD HPPC LabIGCMESchool of ChemistrySun Yat-sen UniversityGuangzhou510275China Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center Jieyang515200China

To simultaneously endow thermal conductivity,high glass transition temperature(Tg)and healing capability to glass fiber/epoxy(GFREP)composite,dynamic crosslinked epoxy resin bearing reversibleβ-hydroxyl ester bonds was reinforced with boron nitride nanosheets modified glass fiber cloth(GFC@BNNSs).The in-plane heat conduction paths were constructed by electrostatic self-assembly of polyacrylic acid treated GFC and polyethyleneimine decorated ***,the GFC@BNNSs were impregnated with the mixture of lower concentration(3-glycidyloxypropyl)trimethoxysilane grafted BN micron sheets,3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate and hexahydro-4-methylphthalic anhydride,which accounted for establishing the through-plane heat transport pathways and avoiding serious deterioration of mechanical *** resultant GFREP composite containing less boron nitride particles(17.6 wt%)exhibited superior in-plane(3.29 W·m^(-1)·K^(-1))and through-plane(1.16 W·m^(-1)·K^(-1))thermal conductivities,as well as high Tg of 204℃(Tg of the unfilled epoxy=177℃).The reversible transesterification reaction enabled closure of interlaminar cracks within the composite,achieving decent healing efficiencies estimated by means of tensile strength(71.2%),electrical breakdown strength(83.6%)and thermal conductivity(69.1%).The present work overcame the disadvantages of conventional thermally conductive composites,and provided an efficient approach to prolong the life span of thermally conductive GFREP laminate for high-temperature resistant integrated circuit application.

关键词： Thermally conductive composites Boron nitride High-temperature resistance β-Hydroxyl ester bond Healing

The Research on and Application of the Multi-regression Technique in the Course of the Marketing Decision-making of Enterprises

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厦门大学学报（自然科学版） 2002年第S1期41卷 221-222页

作者： qiu xiao-dong, ZHAO ping (School of Economics & Management, Tsinghua University, Beijing 100084 , China)

The reformation of the economy system has led the f un ctional department and status of the enterprises into a variable state. Under th e condition of the market economy, the kernel of the enterprises’ functional dep artment has diverted to that of marketing decision-making, which face to market and meet with the need of consumption. Assuredly, the kernel of marketing decis ion-making is to prognosticate the future market demand of the production of en terprises accurately, so that it can ensure and realize the maximum of the enter prises’ profit increase. Using empirical research and the multi-regression technique, this paper ana lyzes the enterprises’ production demand forecast of the GMC (Global Management Challenge, held every year globally) and changes most of uncontrollable factors of demand forecast to the controllable ones of the enterprises. The method we us ed to forecast demand by using the multi-regression technique is as follows: 1. Look for the main factors which influence the demand of productions; 2. Establish the regression model; 3. Using the historical data, find the resolution of the correlative index an d do the prominent test; 4. Analyze and compare, regression, adjust parameter and optimize the regress ion model. Our method will make the forecast data closer to the actual prices of the future market requirement quantity in the production marketing decision-making of the enterprises and realize the optimizing combination and the working object w ith the minimum of the cost and the maximum of the profit. And it can ensure the realization of the equity maximum of the enterprises and increase the lifecycle of the production.

关键词： marketing decision-making demand forecast corr elative index multi-regression technique