移动虚拟现实设备用于植物景观改造设计表达

虚拟现实(virtual reality,简称VR)技术的应用范围极其广泛,已经成为各个领域学者们关注的重点。目前,在园林植物景观设计中VR技术的应用还是比较少的。在传统的设计中,经常会遇到一些问题,如由于选择植物的类型不当或种植形式不合理,而导致了许多年后植物群落出现拥挤或稀疏的状态,使整体植物群落看上去不尽人意。此时,需要从景观可持续发展角度对绿地植物群落进行改造设计。但为了避免植物群落可持续性改造设计中会出现植物生长成年后分布不合理的问题,现在详细了解VR技术的发展历史以及其应用现状的基础上,确定以基于VR技术的便携式智能移动设备与植物群落改造及室内空间设计相结合为主要切入点,对植物景观改造设计方案以多视角的形式进行表达,实现植物景观改造设计的可持续性。     

长白山区林下轮叶党参丰产关键栽培技术

以长白山区轮叶党参为试材,采用种子处理方法、郁闭度、打尖和摘蕾、栽植锥栽植方法,对比分析了不同方法对轮叶党参产量的影响。结果表明:800mg·L-1赤霉素处理种子,在郁闭度0.6以下种植轮叶党参,花蕾期进行打尖+摘蕾能够促进轮叶党参增产,利用栽植锥技术可以减少对根的伤害和对林地的破坏,实现了保护地下植被、不伤及树根的要求,并在实际中得到应用。     

猪源ST9型耐甲氧西林金黄色葡萄球菌中前噬菌体的流行状况与转导分析

本研究旨在分析猪源ST9型耐甲氧西林金黄色葡萄球菌(Staphylococcus aureus,MRSA)中前噬菌体的流行情况、结构特点和转导能力,探究前噬菌体在猪源MRSA流行克隆形成中的作用。基于全基因组信息,分析了近年来从我国多省分离的131株ST9型MRSA中前噬菌体的流行率、分型、亲缘关系和结构特征;选取含不同分型前噬菌体的菌株进行诱导,对诱导获得的噬菌体颗粒进行转导,测定转导子的耐药表型及体外适应性。研究结果显示：猪源ST9型MRSA的前噬菌体携带率为78.6%(103/131株),其中,63株携带完整前噬菌体序列,所有前噬菌体序列均不含耐药基因,仅2.9%(3/103株)的前噬菌体序列含毒力基因;前噬菌体谱型丰富,其整合酶分型主要为Sa2int和Sa4int;各型别前噬菌体结构同源性较高,完整前噬菌体可被诱导为长尾噬菌体;噬菌体颗粒可包装供体菌的aadD、tet(L)耐药基因并转导至受体菌中;转导子可获得卡那霉素、四环素耐药表型,体外生长能力与受体菌株无明显差异(P>0.05)。研究结果表明：猪源ST9型MRSA的前噬菌体携带率较高,谱型丰富,不携带耐药基因,部分噬菌体可包装供体菌的耐药基因转导至受体菌,产生的适应性代价小。     

Design of Preparation of High Grade WC Powder from Voilet WO2.72

Synthesis of W powder by oxide reduction method and fabrication of WC powder by carbonization of W powder are investigated, using violet and blue tungsten oxides as the raw materials, respectively, for the preparation of excellent high grade WC powder. Microstructure and properties of the two raw materials and the obtained W powders and WC powders are studied. The results show that violet tungsten is a suitable raw material for synthesizing uhrafine W powder using the conventional method. The W and WC powders produced from the violet tungsten oxide have better physical properties than those produced from blue tungsten oxide.     

Parameter Simulation on the Control Strategy for a Parallel Hybrid Electric Vehicle by CRUISE

The purpose of a parallel hybrid electric vehicle(PHEV) is for the best energy distribution between internal-combustion engine(ICE) and electric motor though the appropriate control strategy.It can not only keep the advantage of the ultra-low emission of electric vehicles(EV),but also take advantages of the hyperbaric energy of ICE.Simulation model for PHEV is built based on CRUISE,an auxiliary control strategy is designed,and then parameter simulation study on the control strategy is performed.The simulation results show that according to the different control requirements,the vehicle performance can be improved by adjusting!the corresponding control parameters.     

Slab Defect Diagnosis and Predicting System Based on Rough Set Theory

In accordance with the special characteristics of state medium-sized construction enterprises and their reform objects of "having a free hand and enlivening", the suitable objective model, the stock cooperative system for state medium-sized construction enterprises has been put forward in this paper by analyzing the system mechanism of stock cooperative system enterprises. Then the causes for it were expounded.     

Control of Sweeper and Anti-jamming Measures

Sweeper is a machine, which can clean up rubbish on the road surface with functions like drizzling, sweeping and sucking rubbish. Aiming at control of sweeper, the author introduced analyses on the theory of software and hardware of the system and their design using single chip computer (8752BH) as the core of control system. At the same time, the authors expatiated some anti-jamming measures, discussed the measures from the points of restraining electromagnetic noise, hardware and software anti-jamming to enhance the reliability of the control system.     

A Multi-agent Fault Diagnosis System of Rotating Machinery Based on CBR

Recently,distributed intelligent systems based on multi-agent have been applied to many fields successfully.the multi-agent technique is introduced into the rotating machinery fault diagnosis system.With the combination of CBR technique,Basalstructure and development approach of the system are analyzed,and better cooperation among agents is realized.As a result,the system overcomes the limitation of single fault diagnosis method,and solves the contradictionbetween versatilityand adaptabilityof diagnosis software.Furthermore,a reference can be used for the research and development of multi-algorithmdiagnosis system of rotating machinery.The application in a factory's Networked Online Monitoring and Fault Diagnosis System for Turbine Fan shows that the system can diagnosefault rapidly and exactly.     

Asymmetric Exhaustive Service Polling System with Bernoulli Feedback

This paper studies asymmetric exhaustive service polling system with Bernoulli feedback,gives the distributions of queue lengths and sojoun times,and obtains some other results,in stationary condition.     

Application of Attribute Reduct Method in Spatial Load Forecasting

Spatial load forecasting is a process distributing the total forecasted load to all partitioned area, and involving more spatial information and more factor influencing application of the future small area, which need a great deal of memory space and longer operation time. Rough set is new method of data analysis. It need not be provided with any advanced information except data set. But attribute reduct is its main algorithms. Division matrix approach on rough set used to reduce the attribute related to land - use decision in order to remove redundancy attribute and then the rules of small area land - use decision is distilled. The method obtained better effect and enhanced the total load forecasting efficiency.