Displacement iteration Form finding Arithmetic in R Coordinates of ISFSL

In order to put the Internal Stretch Forming Space Lattice Structure (ISFSL) into practice, based on the Geometrical Displacement iterative Method, the Displacement iteration Form finding Arithmetic in R Coordinates is proposed,in which only the displacement iteration is exerted on span coordinates of ISFSL. A detailed study on the form finding process is carried out, which is based on an ISFSL with a long span of 80m. The result shows that this arithmetic is very simple with great efficiency and working speed. When the sixth iteration is accomplished, the maximal absolute value of error of coordinates is only as follows: ΔR=7.03E-04m, Δθ=6.7E-0°, ΔZ=.04 E-0m,which is satisfied to the engineering oriented need. The arithmetic also ensures the continuum and integrality of the structural forming and loading analysis, and is quite fit to the form finding study of ISFSL.      

System simulation for COREX process: model descriptions

System simulation for COREX process not only gives guidance for its development, but also produces a theoretical basis for the design of its computer control system. A composite model for computational analysis on COREX process of ironmaking has been developed. The model combines a set of common material and heat balance equations, chemical equilibrium equations, and other considered correlations.These equations or correlations are coupled together through the material flows and energy flows between each two of all reactors in COREX process. All parameters are calculated based on one ton hot metal. The consumptions of ore and flux, the quantity of slag, and the composition of slag are calculated using the mass conservation for the element of Fe and the oxides such as CaO、MgO、SiO2、Al2O3、MnO and P2O5, etc. The gas volume and composition are calculated using the mass conservation for the elements of C and H and the chemical equilibrium of water gas reaction, etc. The O2 consumption is calculated using the conservation of the element O. The coal consumption is calculated by using of heat balance for the melter gasifier.     

Flash pyrolysis liquefaction of biomass

Experiments are conducted using an integrative biomass pyrolysis liquefaction installation to extract liquid fuel via a fast pyrolysis of biomass. With several representative biomasses being used as raw materials, we investigate ways to affect the pyrolys     

Effects of magnesium stress and temperature on the crowth and photosynthetic character of cucumber seedlings

The effects of magnesium stress on the growth and photosynthetic character of cucumber seedlings are studied at various temperatures using artificial climate box. This is done to investigate the functional mechanism of magnesium in cucumbers. The results show that at low temperature, magnesium stress evidently inhibits plant growth, while at suitable temperatures it decreases the plant diameter, total number of leaves, leaf area, and dry weight of the above ground parts, and increases the plant height and root/shoot ratio. Excessive magnesium promotes below ground cucumber growth. The value of chlorphyl A/chlorophyl B (Chla/Chlb) increases more under conditions of magnesium deficiency than under magnesium excess. The Chla, Chlb and Cxc content decreases when magnesium is deficient, increase when excessive magnesium exists at suitable temperatures, but decreases if excessive magnesium exists at low temperatures. Pn and Gs decrease under magnesium stress, and are at the lowest level when excessive magnesium exists at low temperatures. The effects of magnesium stress on Ci, WUE, Tr and Ls vary at different magnesium concentrations and temperatures. The main factor limiting photosynthesis of cucumber seedlings is non stomata factor when magnesium is deficient, but is a stomata factor if there is excessive magnesium.     

Parameter estimation of the carbon oxidation process of the activated sludge model using respirometry

A new hybrid respirometer is used to measure the oxygen uptake rate (OUR) of COD aerobic biodegradation process. Parameter identification and estimation of carbon oxidation process of an Activated Sludge Model are studied by combining the OUR data and mathematical fitting of curves. Coefficients of variation (CVs) for the three combined parameters estimated are below 13% for activated sludge from a laboratory and below 8% for activated sludge from a wastewater treatment plant. For single parameter estimation, the CVs are below 25% and below 10%, respectively. High measurement frequency and precision of the hybrid respirometer can improve the precision of parameter estimation. Initial concentrations of the substrate and the activated sludge of the respirometric experiment are key conditions that must be optimized to obtain high precision parameter estimation due to their effect on OUR curve characteristics.     

Stability of various height waste dumps based on nonlinear strength criterion

Coal mining waste dumps are representative artificial accumulations of bulky rock and soil material. Certain factors make these dumps possess characteristics such as self organized criticality, nonlinear shear strength of the waste accumulation. We discusse the main waste dump characteristics and subsequently produced numerical simulations of the stability of waste dumps of various heights using the Fast Lagrangian Analysis of Continua and based on the Hoek Brown nonlinear strength criterion. The simulation calculation results show that the stability is a dynamic evolving process corresponding to increasing waste dump height. Safety factors, based on a nonlinear rule, vary with the waste dump height. Theoretical analysis and calculated outcomes reveal a progressive failure rule of waste dumps, and all indicate the methods we put forward are reasonable.     

Behavior of dendriform connections of concretefilled steel rectangular tubes

Dendriform connections of concrete filled steel rectangular tubes (CFSRT) are composed of a bifurcated column and double cruciform beam column connections. A 3 D nonlinear finite element analysis (FEA) which considers all nonlinear effects of materials, geometry and contact interfaces is established. Analysis of the FEA results show that the load displacement curves at the ends of the beam and hysteretic curves obtained experimentally and via FEA agreed with each other. The stiffener transfers the tension compression stress efficiently, the middle hole has little influence on the stress transfer, and the compressive zone of the core concrete under repeated loading has a greater contribution to the compression stress transfer.     

采用16S rDNA鉴定甜瓜细菌性叶斑病菌

从甘肃河西、新疆阿勒泰甜瓜上分离获得的2株致病细菌,通过16S rDNA序列测定以及序列同源性比较,结合病原菌落培养性状、菌体形态观察和革兰氏染色反应等,初步确定当地甜瓜细菌性叶斑病菌为丁香假单胞杆菌[Pseudomonas syringae pv.lachrymans (Smith et Bryan) Young et al.]     

公共管理视域下基层体育行政干预的特征、作为及路径研究* ——以四川省为例

基层体育行政组织作为体育行政管理体系中一个职能部门,是贯彻和落实国家体育基本政策的基本行政单位,在体育事业发展过程中具有至关重要的作用。研究认为：四川省基层体育行政干预呈现出：重竞技、轻群体、弱学校,重指令、轻市场,重建设、轻服务,重结果、轻过程,重内部管理、轻外部实践等特征;制约四川省基层体育开展的诸多因素包括：上级监管、职能建设、行政供给、环境保障、行政协调等。基于此,确立基层体育行政部门的法学地位、明确基层体育行政干预的行为重点、加大与基层教育部门的职能协作、积极培育和完善基层体育市场、加紧基层体育场所设施的新建与维护、政府放权积极培育社会体育团体组织等可以提升基层体育行政干预效能。     

高等院校太极拳教学的困惑与反思* ——基于文化本源的思考

太极拳是借用了“太极”概念,建立在太极学说基础之上的武术拳种。为改变当前高等院校太极拳教学中对太极文化的遗漏和疏忽,从文化本源切入,结合高等院校当前太极拳教学中存在的诸多问题,探讨在教学中如何通过肢体活动等技术载体来充分展示和表达太极拳内在的文化坐标,并提出符合高等院校太极拳教学发展与创新改革的对策,以期在现代体育教学与传统文化之间找到契合点,从而将承载着中华博大精深文化传统的太极拳切实有效的运用到高校现代体育教学中来。