XML技术在现代远程教育中的应用

现代远程教育的发展,对其依赖的基于传统文本为主的HTML语言提出了严峻挑战.XML作为一种"智能"化语言,在网络时代逐渐显示其优越性,并有取代HTML之势.在对XML的技术特点和优势作了详细介绍的基础上,重点探讨了XML技术在现代远程教育中的应用.     

Diagnosis of a Moist Thermodynamic Advection Parameter in Heavy-Rainfall Events

A moist thermodynamic advection parameter,defined as an absolute value of the dot product of horizontal gradients of three-dimensional potential temperature advection and general potential temperature,is introduced to diagnose frontal heavy rainfall events in the north of China.It is shown that the parameter is closely related to observed 6-h accumulative surface rainfall and simulated cloud hydrometeors.Since the parameter is capable of describing the typical vertical structural characteristics of dynamic,thermodynamic and water vapor fields above a strong precipitation region near the front surface,it may serve as a physical tracker to detect precipitable weather systems near to a front.A tendency equation of the parameter was derived in Cartesian coordinates and calculated with the simulation output data of a heavy rainfall event.Results revealed that the advection of the parameter by the three-dimensional velocity vector,the covariance of potential temperature advection by local change of the velocity vector and general potential temperature,and the interaction between potential temperature advection and the source or sink of general potential temperature,accounted for local change in the parameter.This indicated that the parameter was determined by a combination of dynamic processes and cloud microphysical processes.     

爆破锚杆卸压锚固注浆加固反拱底板技术及施工工艺研究与应用

从解决现场实际问题入手,通过现场实践与分析,提出了巷道掘进和回采期间底板治理方案,为类似工程施工提供了依据,具有较高的推广应用价值。     

一种模糊时态描述逻辑

针对现实生活中信息的时间性和模糊性,在模糊描述逻辑和时态逻辑的基础上,提出了一种模糊时态描述逻辑FTDL,并给出了其语法和语义的相关说明。与模糊描述逻辑FALC相比,FTDL的提出为语义Web服务的建模和推理提供了一种有效的途径。     

Analysis on Conductivity of nc—Si：H Films

A conduction channel model is propsed to explain the high conductivity property of nc-Si:H.Detailed energy band diagram is developed based on the analysis and calculation ,and the conductivity of the nc-Si:H was then analysed on the basis of energy band theory.It is assumed that the conductivity of the nc-Si:H stems from two parts:the conductance of the interface,where the transport mechanism is identified as a thermal -assisted tunneling process,and the conductance along the channel around the grain,which mainly determined the high conductivity of the nc-Si:H.The conductivity of nc-Si:H is calculated and compared with the experiment data .The theory is in agreement with the experiment.     

A model of wood flash pyrolysis in fluidized bed reactor

With a view of exploiting renewable biomass energy as a highly efficient and clean energy, liquid fuel from biomass pyrolysis, called bio-oil, is expected to play a major role in future energy supply. At present, fluidized bed technology appears to have maximum potential in producing high-quality bio-oil. A model of wood pyrolysis in a fluidized bed reactor has been developed. The effect of main operation parameters on wood pyrolysis product distribution was well simulated. The model shows that reaction temperature plays a major important role in wood pyrolysis. And a good agreement between experimental and theoretical results was obtained. It was shown that particles less than 500 μm could achieve a high heating-up rate to meet flash pyrolysis demand.     

阀控式铅酸蓄电池组主动均衡研究

探讨了电源系统中浮充电压对阀控式铅酸蓄电池寿命的影响,要保证蓄电池的使用寿命,必须有合适的浮充电压。讨论了传统的均衡充电不适合阀控式铅酸蓄电池的原因,提出了蓄电池组主动均衡的方法。通过主动均衡,可以使电池电压达到足够的均衡精度,保证电池的安全稳定和延长电池的使用寿命。     

电站锅炉燃烧实时诊断应用技术

较全面地介绍了国内外有关锅炉燃烧诊断研究方面的成果,主要包括燃烧火焰检测诊断技术和压力脉动燃烧诊断技术等。讨论了提高燃烧实时诊断可靠性的具体方法。     

基于IEEE 802.16e的跨层上行调度架构设计

对IEEE 802.16标准的上行链路调度架构进行了研究,并联合MAC层和物理层,设计了一种跨层的上行调度结构,在满足移动性要求的同时增强了系统的QoS保障能力,使频谱利用率和吞吐量得到提高.