Fast Animation Display of Large Structure with Multistep Modes

The method that the MASM assembler is interlaced to the MS-FORTRAM 5. 0 is used to store some step structural mode drawings in the designated disk file through their visiting VRAM,which are then restored in it when needed in order to realize the quick animation display of the mode. This method solves the problem of insufficient memories in storing multistep structural mode drowings with the ordinary method. As a functional modular of finite element analysis programs SAPS and ADINA transplanted to a microcomputer,the modular programed with the above method can quickly display the animation of large structure with multistep modes.     

Competitive Performance of Construction Companies Based on Analytic Hierarch Process

Competition among construction companies becomes drastic while market economy is gradually established in China.It is a problem of concern that how to rationally evaluate the competitive ability of construction companies in order to plan the competitive strategy for companies.The multi index system and comprehensive index are proposed in this paper and Analytic Hierarch Process(AHP) is applied to calculate the weights of multi index.The evaluation model of competitive performance of construction companies is presented based on AHP.An example for the evaluation model is given.The results demonstrate that the model can be used to efficiently evaluate the competitive performance of construction companies.The competitive strategy can be suggested through analyzing some factors influencing the competitive performance of construction companies.     

On Sustainable Development Mode of the Folk Dwellings Landscape

The development mode of the folk dwellings landscape both at home and abroad is studied.The influence of the development of the folk buildings and dwellings landscape on the traditional architectural culture,the ecological environment quality and the tourism is analyzed.The sustainable development mode for the folk dwellings landscape is investigated.As a conclusion,it is suggested that the national culture and the ecological environment should be preserved in the development of the economy of folk dwellings tourism in West China and the whole country as well.     

发展芦笋产业的战略思考

针对定襄县芦笋产业的现状、产业优势和存在的问题,分析了发展芦笋产业的前景,并提出了发展芦笋产业的几项基本措施及其研究方向。     

不同施氮方式和栽插密度对杂交中籼丰两优1号的影响

采用两裂式裂区试验探讨了丰两优1号的栽培技术,结果表明施氮方式和栽插密度都对产量有显著的影响,施氮水平与每穗实粒数、栽插密度与有效穗都存在极显著的正相关。在产量构成中有效穗影响最大,其次为穗实粒数。在大田生产中,要适当提高栽插密度,适宜播量为22.5万~28.13万穴/hm2;重施基肥,后期要增施粒肥均有利于提高产量。     

除草机器人自适应快速积分终端滑模跟踪控制技术

智能除草机器人在草坪作业时,易受到外界扰动以及系统不确定性的影响,从而导致轨迹跟踪收敛时间长以及跟踪效果差等问题。因此,设计一种面向轨迹跟踪的自适应快速积分终端滑模控制算法。首先,考虑驱动轮动力学特性以及未建模误差、外界干扰、动静摩擦等不确定性因素,建立除草机器人的动力学模型。然后基于所建立的动力学模型,设计自适应快速积分终端滑模控制器。所提出的控制器结合了快速终端滑模、积分滑模和自适应估计技术的优点,能够实现期望的跟踪性能并抑制控制信号抖动。同时,在不需要明确系统不确定性和外界干扰上界的情况下,可以通过所设计自适应估计项进行实时补偿,提高系统的鲁棒性。最后,通过仿真和试验验证了该方法的有效性。试验结果表明,所设计的控制器能够使跟踪误差在有限时间内快速收敛,并且横向误差绝对值不超过0.097 9 m,纵向误差绝对值不超过0.102 6 m,航向角误差绝对值不超过0.057 8 rad,保证除草机器人准确跟踪作业路径,同时具有较强的鲁棒性。     

不同水氮管理模式下黑土稻田碳固定与碳减排效应分析

为探寻不同水氮管理模式对黑土稻田碳固定与碳减排效应的影响,进行了田间试验研究。设置常规淹灌(F)与控制灌溉(C)两种灌溉模式,选用110 kg/hm²(N)、99 kg/hm²(N1,减氮10%)、88 kg/hm²(N2,减氮20%)3种施氮量,测定了6种水氮管理模式下的水稻土壤呼吸CO₂排放强度和CH₄排放强度,水稻收获后各器官干物质量、碳含量及固碳量,并计算了净土壤碳收支情况。结果表明,不同水氮管理模式下,各处理土壤呼吸CO₂排放量呈现单峰值变化,并在分蘖期达到峰值;各处理甲烷排放量呈现双峰值变化且在分蘖期与穗肥施入后达到峰值。相同灌溉方式下,随着施氮量的减少,土壤呼吸CO₂排放强度与甲烷排放强度也显著减少(P<0.05)。相同施氮量下,控制灌溉相比常规淹灌有效地降低了甲烷排放强度,但提高了土壤呼吸CO₂排放强度。不同水氮管理模式下,水稻收获后总固碳量为319.37～489.00 g/m^2<...     

浅议地下室后浇带渗漏的检测与处理

随着现代建筑功能需求的多元化,地下室成为当前城市建筑工程开发中较为常见的地下建筑结构,后浇带浇筑通常是为避免钢筋混凝土结构出现温缩或沉降裂缝而采取的施工技术工艺,受客观因素影响和制约,地下室后浇带部位通常会出现不同程度的渗漏现象,本文针对其渗漏成因及处理方法进行分析。     

徐州地区农村庭院绿化生态化建设研究

选择江苏徐州地区8个典型村庄共160户作为调查对象,对农户的绿化面积、植物种类、院落结构进行调查。通过调查,将徐州地区农村庭院绿化配置模式分为3种：材质型庭院绿化、观赏型庭院绿化、果蔬型庭院绿化。在此基础上对徐州地区农村庭院绿化存在的绿化趋于单一、植物病虫害防治较弱、蔬果食用安全性降低等问题进行分析,并就此提出相应的对策建议。     

湖南油茶产业发展模式分析及优化对策

分析了湖南油茶(Camellia oleifera)产业4种发展模式的特点,比较了它们之间的优劣势,并指出了其未来的发展方向.在此基础上,从突破油茶产业发展过程中普遍面临的土地、资金、劳动力等生产要素瓶颈的角度,提出了优化与创新湖南现代油茶产业发展模式的对策与建议.