Discussions on the Bearing Capacity of the Enclosed Reinforced Concrete Strengthened Brick Masonry Column under Axial Compression

The calculation problems of bearing capacity of enclosed reinforced concrete strengthened brick masonry column under axial compression is introduced, which can be available for reference in calculating the bearing capacity of enclosed reinforced concrete strengthened brick masonry column.     

亚麻纤维在增强复合材料中的应用与研究进展

为了研究亚麻纤维作为可再生增强复合材料在生产中的应用，笔者综述了近年来亚麻纤维的组成结构与机械性能及亚麻纤维在增强复合材料中的应用，并介绍了目前亚麻纤维复合材料的生产工艺。发现新型界面相容剂的开发对于提高亚麻纤维增强复合材料的高耐久性具有重要作用，探讨了亚麻纤维增强复合材料的应用前景和发展趋势，以及生物复合材料开发的可行性。     

A PRACTICAL METHOD FOR SELECTING STEEL USING COMPUTER AIDED DESIGN(CAD)SYSTEM FOR REINFORCED CONCRETE FRAME

How to select automatically the disposition of steel bar in a computer aided design(CAD)system for reinforced concrete frame structure is aproblem relatedt ot he practicality and increasing capacity of the CAD system.This paper suggests a practical method for selecting steel bar of beam in framestructure with the application of knowledge and experience of the experts forreasoning and judging.The method is convenient for calculation.The results ofcalculation are in agreement with detailing requirement and usual engineeringpractice.The method has great practical value.     

Heat Transfer Model and Application of Buried Tube Heat Exchanger for Ground Source Heat Pump

This paper introduces the theoretical basis and application method for heat transfer model of buried tube (pipe in pipe and U- type) heat exchanger for ground source heat pump, and a practical example is calculated. Then, the calculation results are analyzed and discussed. In particular, the correlation coefficient and calculation method of tube group exchanger is discussed; the method for determining known parameter and some basic data for main procedure GSHP.HTM is analyzed. The calculation formula and data sampling for JSW.HTM subroutine is introduced. At last, the problems in application of calculation procedure, to which should pay attention, are discussed.     

Research and Application of utomation Create of Dimensional Chain Equations under CAD Environment

应用3种保鲜剂配方处理荷花鲜切花,结果表明,3种保鲜剂均能延长荷花的瓶插寿命,尤其是配方Ⅱ处理:保鲜剂A 蔗糖2% 保鲜剂B,且在8～10℃中保鲜的效果最佳,保鲜期可达到9天以上。另外,环境气温越高其保鲜寿命越短。     

Research on Design Methods for Reinforced Earth Retaining Wall with Cohesive Backfill

For the stability analysis of the reinforced earth retaining wall with cohesive backfill, this paper assumes that the state of failure surface is circular sliding surface and the bearing capacity is straight line relation with capacity and length of the reinforcement strip. These formulas agree with actual state of the reinforced earth retaining wall with cohesive backfill and result in saving reinforcement material in the design.     

Structural Model and Cargo-handling Technology of the Quay with High Amplitude of Water Level in Lantsang

The background of a west communication science & technology project whose topic is structural model and cargo-handling technology of the quay with high amplitude of water level in Lantsang is introduced, and its main research content, research of key technology and main findings are introduced too. Three types of structural model and cargo-handling technology which can be applied perfectly in Lantsang are put forward. The structural models include beam and slab structure with pillar supported, box bridge crane structure and reinforced earth structure, the cargo-handling technologies include vertical fixed crane technology, bridge crane technology and movable simple crane technology. Some findings have been applied in the supporting engineering-Menglun harbor.     

土壤侵蚀及其评价、校验方法研究进展

土壤侵蚀是导致土地退化、农业减产和生态功能退化的全球性环境问题,受到国内外众多学者的普遍关注。目前,土壤侵蚀研究方法主要有径流小区、同位素示踪、稀土元素（REE）示踪、侵蚀模型模拟以及遥感和测量学的定性评价等,各方法均有其自身的特点、优势和适宜的研究尺度。其中,同位素、REE等示踪方法适合在坡面和小流域尺度应用,有助于土壤侵蚀过程的深入理解和土壤侵蚀模型的建立及验证。而GIS和RS在土壤侵蚀物理过程模型中的应用为区域尺度土壤侵蚀的评价、预测和调控奠定了基础。今后的研究应当加强土壤侵蚀过程和侵蚀机理研究,综合运用各种研究方法和手段,实现大尺度土壤侵蚀评价、预测和验证的动态、快速实现。     

旱地农业覆盖栽培技术研究进展

重点对国内外砂石、土层、秸秆、塑料薄膜、化学覆盖物等5种覆盖物的覆盖方式、覆盖技术及覆盖后对土壤环境、对作物生长发育及增产效果的研究和应用情况进行了介绍和讨论。同时提出今后旱地覆盖栽培技术研究的方向和重点是:新型降解地膜的研制和应用;秸秆地膜组合覆盖方式与技术研究与推广;新型化学覆盖材料的研制与应用。     

旱地农业覆盖栽培技术研究应用进展与展望

重点对国内外砂石、土层、秸秆、塑料薄膜、化学覆盖物等5种覆盖物的覆盖方式、覆盖技术及覆盖后对土壤环境、对作物生长发育及增产效果的研究和应用情况进行了介绍和讨论。同时提出今后旱地覆盖栽培技术研究的方向和重点是：新型降解地膜的研制和应用；秸秆地膜组合覆盖方式与技术研究与推广；新型化学覆盖材料的研制与应用。     

新建钢筋混凝土立筒仓的储粮

好新建钢筋混凝土立筒仓使用前的准备及配合土建、设备质量验收情况。强调了作 为 储备仓的筒库，安装多功能减压管和配备通风、密闭、熏蒸、检测等设施的必要性。详细介绍了通风、熏蒸、多功能减压管的出入粮工艺及使用中的优点。     

等截面钢管混凝土格构柱骨架曲线的统一算法

介绍了斜缀管式和平缀管式等截面钢管混凝土格构柱骨架曲线的计算方法并进行评价分析。研究表明，不同缀管布置形式的钢管混凝土格构柱，其抗震性能具有共性。借鉴钢管混凝土单肢柱的计算框架，开展等截面钢管混凝土格构柱骨架曲线的统一算法研究，对弹性刚度、水平峰值荷载、峰值荷载位移、下降段刚度等主要参数的计算方法进行了深入探讨和算例分析，并以干海子大桥格构柱墩为研究对象，采用OpenSEES有限元程序，对骨架曲线算法进行工程实例验证。研究结果表明，计算值与试验值及有限元计算结果均吻合良好。最后提出了适合工程应用的等截面钢管混凝土格构柱骨架曲线的统一简化算法，为钢管混凝土计算理论的进一步完善和规程编撰提供参考。     

Study on Consolidation of Reinforced Soft Foundationwith Two-way Drainage of Sand Well

Based on traditional consolidation theory, the soft ground settlement is calculated and one-, two-, and three-dimensional consolidation of reinforced soft foundation with sand drain is studied. The calculation method of average sand drain and the new modified method are discussed. The results can serve as a guide to subgrade design of soft ground.     

Earth Pressure on Retaining Structure of Round Deep Foundation Pit in Sand-cobble Soils

In recent years, the round deep foundation pits engineering gradually appears in Chengdu Plain whose strata are mainly sand-cobble soils. However, there are no proper calculation methods of earth pressure in retaining structure like this and distribution mode of the pressure is unknown. With the use of elastoplastic numerical simulation method involved in interaction between retaining piles and soil, the distribution law of earth pressure of the round deep foundation pit retaining structure is determined. The result shows that distribution of earth pressure on a pile is triangular and the maximum lies in the location of pit bottom, but the average value of the pressure is less than Rankine active earth pressure. Model tests have also been carried out so as to verify the distribution mode. As for the test model, the values obtained by the numerical simulation method are approximately similar to the experimental results in the distribution law as a whole, which to some degree suggests the rationality of the numerical simulation results.     

Application of frequency shifting in truncating substructure low order normal modes

A method to cutoff substructure low order normal modes in component mode synthesis is proposed. Frequency shifting technique is introduced in substructure free vibration differential equation. Quasi-static constraint mode is taken into coordinate transformation and the contribution of substructure low order normal modes to system middle frequency modes is reduced,thus substructure low order normal modes truncation is achieved. This technique is used to compute dynamic characteristics of a body-in-white FEM mode in the frequency band of 160~190 Hz. The results show that compared with traditional component mode synthesis,which keeps 1 836 normal modes,this method only needs 297 normal modes and saves 27.7% calculation time. It means frequency shifting technique can improve the computational efficiency for middle frequency band dynamic characteristics of complex structure.     

Consideration of External Prestressing Technique Applied to Bridge Reinforcement

The external prestresing technique has become an important method since it was used in the reinforcement of the upper structure of existing bridge. In this paper, the advantages and disadvantages of this method in brief are introduced and emphasis is put on the consideration and progress of its application.     

核磁共振技术在食品品质分析中的研究进展

核磁共振检测技术是一种新型的食品无损检测技术。介绍了核磁共振技术的基本原理及在食品加工品质分析中的研究应用,并展望了该技术在未来食品加工业中的应用前景。     

Flowmeter Based Virtual Instrument

The flowmeter based virtual instrument is a new test instrument, which has more advantages than the traditional flowmeter. This flowmeter is based on Qin's model. Apply to the flowrate measurement realm the virtual instrument technique. The design method has been introduced from hardware, software and panel, modelize the different flowrate measure way, with the virtual instrument's figural calculation and show to replace the traditional flowrate measurement, realize multi-threading long-distance flowrate measure easily.     

引人注目的储粮害虫防治研究进展述评

作者根据所掌握的新近国际储粮害虫防治领域的科学研究与应用技术的动态和发展 ,结合我国情况 ,在熏蒸剂磷化氢和惰性粉类杀虫剂方面 ,择其主要的作了扼要介绍 ,并提出了看法和建议。     

Theoretical Analysis of Load Capacity of EccentricalReinforced Concrete Columns with Concerete Cover

Based on the plane_section hypothesis of combination section,this paper describes the section strains of reinforced concrete columns with concrete cover under initial axial pressure and analyses the height of relative limit compression area and the stress of concrete and reinforcing bar of combination section in ultimate state.Meanwhile,the paper proposes practical calculation method of load capacity.