Analyzing Danger Case of Lifting up Tower Structure by Way of Pulling down

Tower structures are important device in the chemical equipment. They were lifted up by pulled down shearlegs. Tower structures' load is complex and changeful within lifting up. It is multifarious to analyze and to compute. At present, because people always adopts experiential or static analyzing and computing, one neglects changed circumstance and can adopt irrationally kinds of measures. It leads to break down tower structures and be lost in lifting up. This paper deduces computing formulae of danger case and provides basis for design for technics of lifting up according to analyze movement.     

A New Method of Extracting Fault Components Under Power System Swing

To solve the problem that the existing method of extracting fault components is easily affected by power system swing,a new methed has been proposed in this paper,which can be used in high speed protection of transmission lines. This proped method ean greatly decrease unbal-ance outputs under power swing condilions without frequency tracking circuits,therefore it can make the protection using fault compnents operate correctly.     

贵州扁形绿茶关键温度控制研究

温度控制是提高扁形绿茶品质的关键因素,为了明确贵州扁形绿茶加工工艺中关键温度的适用范围,采用L9(3)4正交实验设计,通过调控扁形绿茶加工过程中的做形温度、脱毫温度及提香温度,分析了其对扁形茶感官品质外形、汤色、香气、滋味及叶底的影响作用。实验结果表明在控制的温度范围内,做形温度50℃-70℃,脱毫温度50℃-70℃,提香温度80℃-100℃,九个处理的扁形茶感官品质没有显著性差异,说明在本实验设计的温度范围内可以保证贵州扁形绿茶的高品质。     

Experimental analysis on borehole hydraulic lift equipment

Using quartz sands to simulate the work condition, the experiment on the factors of sand lift which influences the lift effect in borehole hydraulic equipment is carried out. The experiment results show that there is an optimum distance between the intake and mineral deposit; under the condition of the same air input capacity; the lifting capacity increases with the submergence proportion; different installation angle of the water nozzle influences the effect of the sand lift; there is an optimally installation angle of 10 degrees between nozzle axial lead and tangential direction of the lift pipe wall; the number of air nozzles affect lifting capacity; the optimally installation nozzles number is 3; and whether fitting stir nozzles or not is the key factor which determines lifting success.     

The Transportation and Lifting Facilities in Chongqing and the Industrialised Housing

This article introduces that there are good basic conditions and big development space for the industrialized housing development in Chongqing Municipality-the biggest municipality in the country.And it introduces the capabilities of horizontal transportation by land or sea and vertical lifting in Chongqing. And it puts forward that is more economical, reliable and safer than which has the advantages of best weight lifting capacity, service radium. Lifting height and smallest site occupation and the assemble of bigger components even the whole industrialised house.     

基于傅立叶变换的多时次NDVI地表覆被分类方法

从不同植被NDVI随季节的变化出发,通过对不同地表覆被类型多时次NDVI曲线的波形的分析,提出一种地表覆被的分类方法。该方法通过利用曲线方差、经过傅利叶变换后谐波特征K以及最大振幅比重R这三个参数的组合,来进行地表覆被类型的分类。通过计算分类的混淆矩阵以及与部分地区实际地表情况的对比分析,说明该分类方法,能根据不同种类地物不同季节内绿度值的变化特征,对地表进行分类。     

不同基因型饲用甜菜生长动态研究

为解决畜草失衡,机械化、规模化发展饲用甜菜提供理论依据。对5个不同基因型饲用甜菜品种生长指标及根体产量和锤度进行动态研究,并对根体产量和锤度与8个主要指标进行灰色相关度分析。结果表明：叶柄厚度和产量是影响锤度的主导因素；株高和幼苗百株重是饲用甜菜产量的主导因素；叶片数作为饲用甜菜一项重要指标,他不仅影响根体锤度,也影响根体的产量。多倍体品种在改良饲用甜菜苗期抗逆性和提高根体含糖量过程中有很高的利用价值。‘饲用3号’综合指标表现较为突出,并且产量在参试品种中位居第一(12034.56 kg/亩),具有很高的推广价值。     

Improved Genetic Algorithm of Float Encoding and Its Application

As an optimal method, Genetic Algorithm has obvious advantages, which is based on the nature selection and genetic transmission mechanisms such as high collateral,stochastic,self-reliance. but when in practical application, it usually has problems of premature convergence and result swing near optimum value.To solve the problem of premature convergence, the method called Monte-Carlo is adopted to prevent the algorithm from local optimal, and to the problem of result swing, the method changing the hunting zone dynamically is proposed to improve the accuracy of the optimal result. Further more, it devises programs to optimize the test functions of two famous optimal methods. The test results indicate that the improved Genetic Algorithm is valid, which can not only avoid local optimal but also improve the accuracy of the optimal result.     

A PRIMARY STUDY ON A LIFTING PERFORMANCE CURVE ADAPTED FOR THE MECHANICAL LOAD MOMENT LIMITER

The condition when forces are applied to load mechnical mornent limiter of tow-er cranes is analysed and disctissed in this paper.A lifting performance curve adapted for the me-chanical load moment limiter is also obtained.And finally,the curve drawing method is explainedthrough the practical example.     

Programs for Suburban Leisure Tourism Development in Line with Conditions of Linpan in Western Sichuan: A Case Study of Huayuan Town in Xinjin County

At present, suburban leisure tourism in China is in full swing, but the phenomenon of homogenization is widespread. This paper took suburban leisure tourism of Huayuan Town in Xinjin County, Chengdu, Sichuan for example and summarized the characteristics of Linpan in western Sichuan and market conditions to explore programs for suburban leisure tourism development in line with conditions of Linpan in western Sichuan, with a view to providing a reference for suburban leisure tourism development of Linpan in western Sichuan and suburban leisure tourism development in China.     

Human Simulated Intelligence Motion Control for Three-link Acrobot on Horizontal Bar

The design of multi-controller and multi-mode control law is presented for the three-link Acrobot on horizontal bar by employing Human simulated intelligent control method based on sensory-motor Schema.Imitated the characteristics of gymnast's swing-up and handstand movement,the control process of robot is divided by six sequence phase.Then the sensory cell and motor cell and the group of sensory-motor schema is designed based on the analysis of quality-quantity combination.The simulation results show that the controller ensures the gesture and the energy to the desired goal,farther more the motion control of giant swing backword is realized in the simulation.     

白术对鸡离体肠管运动张力的影响

探讨白术对鸡离体空肠和盲肠运动张力的影响。采用离体器官试验法,将鸡的空肠和盲肠置于盛有生理溶液的麦氏浴皿内,然后加入不同剂量的白术水煎液,使溶液终浓度为3.75、7.50、15.00、22.50mg／ml,观察和记录离体肠管运动张力的变化。白术水煎液能促进鸡离体空肠平滑肌收缩运动,使收缩张力和舒张张力增强,收缩振幅增大,其剂量越大作用越强。但对盲肠的自律性收缩活动有显著的抑制作用,可降低肠运动张力,减小收缩幅度,加大剂量其抑制效果亦随之加强。白术能增强鸡离体空肠平滑肌运动张力,抑制盲肠的运动张力,并呈量效关系。     

Structural Strength Study of Switching Cam Profile VVT Mechanism

The switching cam profile variable valve timing(VVT) mechanism is able to control valve lifting and timing system through higher and lower intake rockers at different engine speed.In this paper,multi-body dynamics and the(finite) element method(FEM) analysis method were combined to study the VVT mechanism.The analysis results indicate that intake rockers satisfy for design requirements and the dimensional discrepancy of the switching piston little(affects) on the VVT mechanism performance.     

Analysis and Research on VVT System Control Strategy for Motorcycle Engine

An original variable valve timing mechanism with two-mode intake timing parameters is developed according to the structural characteristics of small-medium displacement motorcycle engine. Based on cycle simulation, a cycle simulation model of VVT mechanism for motorcycle engine is created. The control strategy of variable valve timing and lifting running-model are carried out at idle speed low negative load, middle negative load, low speed high negative load and high speed high negative load. It has been proved that the performance of JH125 motorcycle engine can be effectively improved by loading the new type VVT system.     

Piezoelectric Control of Lifting Surface Flutter

Piezoelectric material was used to establish a single input/single output (SISO) model of a lifting surface with distributed piezoelectric actuators and piezoelectric sensors. The flutter equations and state space equations of piezoelectric laminated structures were also derived. MATLAB, NASTRAN and other software programs compiled by the authors also were used to analyze the flutter and dynamic characteristics. The stability of the closed loop was analyzed for the SISO. The result indicates that the control law can be employed for flutter suppression.     

Hoist for Greenhouse Soil Bed Sterilizing Pans

A light weight, extendable and moveable hoist has been developed to move a greenhouse soil sterilizing pan. Its use has resulted in a reduction of 75 % of the manpower required to displace the pan, elimination of possible back injury to workers when lifting the pan and preclusion of the immediate introduction of pathogens into the sterilized sections of the soil bed.     

农村土地流转中的农民问题探究 ——以郑州市为例

内容摘要：目前各地的土地流转工作进行的如火如荼,很多文献都是关于土地流转可以带来集约化经营的农业和更高的土地利用效率等,关于农民问题的研究大都停留在土地流转之后的一些补救措施上,而没有去深入探究土地流转中的存在的农民问题。课题组通过对郑州市农村调研后发现土地流转问题背后是农民问题,只有农民问题解决了,土地流转的问题也就迎刃而解了。     

Multifocus image fusion scheme based on feature contrast in lifting stationary wavelet domain

A novel multifocus image fusion method based on lifting stationary wavelet transform (LSWT) is proposed. The selection principles, namely fusion rules of different subband coefficients, are discussed in detail. Local feature contrast is presented according to the human vision system (HVS), which is highly sensitive to the local image contrast level. Then, the fusion rule for the low-frequency subband coefficients fusion is introduced. To choose the high frequency subband coefficients, another local feature contrast is developed according to the human vision which is often sensitive to edges and directional features, but insensitive to real luminance at independent positions. Then, a novel fusion rule is proposed for fusion of the high frequency subband coefficients. Experimental results demonstrate that the proposed image fusion method is effective and can provide better performance in fusing multifocus images than the traditional contrast-based image fusion algorithms in term of informal visual inspection and objective criteria in multi-focus image fusion.     

地下水人工回灌经济效益分析浅析

地下水人工回灌具有悠久的历史,人工回灌地下水的方法可分为两类：一是直接补给法,即把补给水源直接输送到地下水含水层中;二是诱导补给法,即除了达到自身的主要目的以外,还能对地下水起到诱发补给效果的方法。但每种方法都各有其特点和适应条件,要选择合适的地下水人工回灌方法,就必须对地下水人工回灌工程经济效益进行科学评价,这是保证回灌方案科学合理、回灌工程经济可行的必要前提。但目前地下水人工回灌效益研究往往是单方面的分析与评价,缺乏综合、系统的分析,提出的人工回灌经济效益包括7个方面：增加供水效益、扬程效益、减少新建水源工程效益、水质效益、增产效益、洪水控制效益和防治咸水入侵效益,并针对各种效益提出了相应的计算方法,完善了地下水人工回灌经济效益分析理论与计算方法,对于地下水人工回灌工程的可行性分析,实现地下水资源的可持续开发利用,改善生态环境,具有重要指导意义。     

台风“海棠”减弱后影响潍坊的暴雨特征分析

摘要：[方法]利用常规天气图、数值预报产品和多普勒雷达资料，[目的]对2017年第10号台风“海棠”减弱后的热带低压进行综合分析，主要针对2017年8月2～3日其影响潍坊的一次强对流天气过程进行个例研究，[结果]结果表明：(1)此次强对流天气过程主要由台风减弱后的热带低压、冷空气和地面气旋共同影响造成的，系统动力抬升条件好，水汽输送条件好，再加上列车效应导致潍坊多个站点出现暴雨和大暴雨天气；[结论]（2）几家数值预报产品对此次过程的天气系统预报差异较大，其中欧洲中心表现较好，对今后的预报有指导意义。