基于云计算的数字图书馆研究

介绍云计算的概念和工作原理,分析数字图书馆如何使用云计算模式来拓展服务和功能,并在此基础上讨论未来图书馆数字信息资源建设在云计算的情况下是如何操作和运作的,以及应当注意的问题。     

江苏建筑职业技术学院图书馆空调系统三维绘图的运用

简要介绍了该工程空调系统设计方案。结合工程设计体会,总结了三维绘图软件的优势与不足,以及应用该软件后设计思路的调整。     

A critical overview of industrial energy decoupling programs in six developing countries in Asia

In reviewing the journal literature on the decoupling of energy use and industrial output in the Asian region, particularly with respect to developing countries, we found little information about most country programs other than for China and India and only one article that compared the programs of these two countries. For this reason, we used diverse sources to identify the key programmatic features that have contributed, but clearly are not totally responsible for, decoupling achievements of two countries ( China and Thailand) and then, on the basis of these findings, reviewed emerging industrial energy decoupling programs in four other countries (India, Indonesia, Malaysia and Vietnam). We found that the design of the two successful on-going decoupling programs have common features, which are setting an explicit target for decoupling of energy use and industrial output, a government program that offers financial incentives and imposes specific auditing and reporting requirements and involvement of the manufacturing sector in designing and implementing targets as they apply to individual enterprises. We also found that the emerging programs in the other four countries lack some or all of these essential programmatic features.     

Method of generating a hydraulic step wave with a short rise time

A hydraulic step wave calibrator (HSC) was newly developed herein to generate a hydraulic step wave with a short rise time that can be utilized to investigate dynamics of hydraulic components with a short response time. The design of the HSC was similar to a general spool valve comprising a spool and a steel housing. A quick-opening mechanism and a tiny sensing cavity were utilized in the HSC to reduce the rise time of the generated hydraulic wave. The experimental results indicate that the dynamic performance of the HSC at various conditions. With the short rise time between 21 and 54 μs, the HSC can be regarded as an extension of hydraulic sock tubes towards low frequencies. The hydraulic step wave generated by the HSC covered a range of dynamic calibration of hydraulic components that current hydraulic wave generators have not achieved yet.     

标准系列模型元件的设计和修改说明

本文阐述设计标准系列模型元件在工程模型中作用及标准系列模型元件的研制过程，并对现编制的标准系列标准元件的设计依据作了分析和说明。     

湖南省山苍子6个天然居群果皮精油成分分析的研究

开展湖南省不同山苍子种质资源果皮精油成分分析与评价,对于筛选与培育优良精油用山苍子优良单株与品种具有重要意义。试验对湖南省6个山苍子天然居群果皮精油进行提取,采用气质联用色谱法(GC - MS)分析其精油成分,并用峰面积归一法对主要成分进行定量分析。结果表明,不同居群果皮含油率存在差异,株洲白马乡含油率最高(3.35%),且变异系数最小(4.78%)；6个居群的山苍子果皮精油GC-MS成分各鉴定出27种、20种、21种、19种、19种、23种,分别占总峰面积的99.73%、99.81%、99.80%、99.82%、99.81%、99.73；所有居群共有成分为9种,各居群分别鉴定出各自独有成分；D-柠檬烯含量为不同山苍子居群果皮精油含量分类的依据,在衡阳市衡阳县、衡阳常宁市、郴州桂东县、岳阳平江县、株洲白马乡这5个居群间进行山苍子D-柠檬烯型优良单株或品种选育的潜力较大。因此,在精油用山苍子选育及种质资源评价方面,要综合考虑不同生态型遗传因素的影响。     

发动机点火提前角自动测试系统

点火提前角是分电器产品合格与否的一项重要指标.介绍了应用霍尔器件、单稳电路及计算机测控技术等测量发动机点火提前角的方法,给出了较为详细的电路原理图,对系统的工作过程和设计原理图作了具体的说明,并论述了克服点火时尖峰干扰的实用方法.     

Identifying the components

Most, if not all, databases are mixtures of samples from different distributions. Transactional data is no exception. For the prototypical example, supermarket basket analysis, one also expects a mixture of different buying patterns. Households of retired people buy different collections of items than households with young children. Models that take such underlying distributions into account are in general superior to those that do not. In this paper we introduce two MDL-based algorithms that follow orthogonal approaches to identify the components in a transaction database. The first follows a model-based approach, while the second is data-driven. Both are parameter-free: the number of components and the components themselves are chosen such that the combined complexity of data and models is minimised. Further, neither prior knowledge on the distributions nor a distance metric on the data is required. Experiments with both methods show that highly characteristic components are identified.     

Ballistic limit equation for equipment placed behind satellite structure walls

A new ballistic limit equation has been developed for the case of a Whipple shield configuration or a sandwich panel with honeycomb core placed in front of a backwall. This “triple plate” ballistic limit equation considers explicitly the thicknesses, materials and spacings of each of the three plates. The third plate, i.e., the backwall, represents the cover plate or external wall of the equipment that is placed behind the satellite structure wall. The ballistic limit equation has been calibrated with experimental results obtained from hypervelocity impact tests on satellite equipment that was placed behind typical satellite structure walls. The equipment considered were fuel and heat pipes, pressure vessels, electronic boxes, harness, and batteries, all representative of real satellite equipment. The new equation was applied to prove that if the inherent protection capability of satellite equipment against hypervelocity impacts is explicitly considered in a ballistic limit equation, the critical projectile diameters for failure of such equipment are raised considerably compared to the case where equipment is assumed to fail as soon as the structure wall that protects it is perforated.