中亚南部湖盆浅水辫状河三角洲识别标志与沉积模式研究

以岩心相、测井相、地震相为标志,通过对中亚南部湖盆Aryskum组古地理背景、砂体展布、水动力条件、沉积构造及地球物理响应等进行综合研究,认为其属于浅水粗粒辫状河三角洲沉积环境,主要发育浅水辫状河三角洲前缘亚相的水下分支河道和支流间湾沉积微相,其中,水下分支河道比较发育,不同方向的河道相互叠置,平面上连片分布,可形成有...     

亚太能源供应受制中东 中亚能否占据一席之地?

在分析了亚太地区能源供需形势、尤其对作为亚太地区最大能源供应方的中东进行分析的基础上,指出中亚作为亚太地区新的能源供应方的可能性。由于亚太地区对石油进口依赖性的增长,中东作为重要的油气输出方,其地位会进一步提升,与此同时,中亚的能源供应潜力越来越多的得到世界的关注,其在亚太的能源战略中将占有更重要的地位。     

Optimizing the design of a solar cooling system using central composite design techniques

This paper presents the development of a method to optimize a solar-assisted cooling system with limited budget constraints. Regression analysis is used to identify the relationship between the solar fraction and the system factors according to the data provided by experiments. In order to obtain an accurate model to estimate the problem using small number of experimental trials, the method of central composite design (CCD) from design of experiment (DE) is used as a key technique. The experimental trials are conducted in the transient energy system simulation (TRNSYS) tool. Finally, the optimization problem is formulated and solved by including the model as the objective function, the physical constraints of the system factors, and the budget limit. A case study was conducted to apply this optimization method to the design of a solar-assisted double-effect absorption cooling system installed in a small-sized office building in West Lafayette, IN, USA. The results show the developed optimal model strongly agrees with the physical system model in TRNSYS. This optimization method can be generally applied to different types of solar cooling systems, and other renewable energy systems.     

The new era of the livestock production in Mongolia: Consequences on streams of the Great Lakes Depression

Mongolia, a landlocked country of the Central Asian plateau, is experiencing a significant modification of herding practices coupled with an increase in livestock numbers. These modifications lead to increasing impacts of grazing on the Mongolian steppes with major consequences on the waterbodies. We researched the impacts of grazing intensity on the streams of the Great Lakes Depression in northwestern Mongolia. We assessed the level of watershed and stream bank erosion and the type of vegetation structure. We calculated the livestock densities per watershed and linked them to the stream water discharge through a new metric (I_CU). I_CU was created as a function of cattle unit density and water discharge, having water discharge at a stream section reflecting its location in the drainage and therefore accounting for the surface area drained upstream. We measured also the major nutrients in the stream water and researched the causalities between the grazing and the impairment of watersheds and streams. Our results suggest that the increase of livestock numbers is reaching beyond the grassland and affecting the stream ecosystem. Two major impacts were highlighted by this study, 1) the extensive watershed and stream bank erosion and 2) the increase in concentration of suspended particles and orthophosphate in stream systems. When compared with past values from literature, our results show recent eutrophication of the streams compared to the pre-liberalization of the herding activity in Mongolia (before 1991). Consequently the continued uncontrolled increase of livestock numbers could threaten the conservation of the Mongolian waterbodies, with notable consequences on the life of the nomadic population of the Central Asian Plateau.     

中欧绿道——设计可持续发展的国际性廊道

以绿道运动在中欧的发展与实际应用为背景,首先回顾了绿道运动最初在欧洲的起源与早期的发展,其次介绍了执行这一运动的可持续发展环境合作组织的愿景、任务及绿道运动在中欧与东欧背景下开展的特点、目标与对象、方法及所产生的有效成果,最后对绿道运动未来的发展方向做了展望.     

一种湿式安全型中央制动器

制动器是工程车辆的关键部件,对车辆运行的安全起着决定性作用.不同功用的制动器,其结构也不相同,介绍一种适用于恶劣环境,特别是可在煤矿井下高瓦斯环境中使用的,具有隔爆性能的湿式安全型中央制动器,对其结构特点、工作原理和制动力矩特性进行分析,为设计同类型制动器提供参考,也为使用和维护这种制动器提供理论依据.     

国产首套刨煤机组控制系统在晓明矿的应用

文章介绍了由三一重型装备有限公司自主生产的全自动刨煤机BH38/2×400的控制系统,该控制系统的硬件系统由防爆工控机、主控制器、支架控制器等设备组成,其通信系统采用可靠性高,传输距离远的CAN总线通信方式.通过全自动刨煤机组BH38/2×400在铁法晓明矿北二419工作面的应用,标志着我国已经取得了薄煤层开采的关键核...     

中央空调自动控制系统概述

介绍了中央空调自动控制系统的组成、内容、功能、特点和分类,着重介绍了几种常用的中央空调自动控制方法。     

Automatic rotational symmetry determination for shape analysis

The determination of the rotational symmetry of a shape is useful for object recognition and shape analysis in computer vision applications. In this paper, a simple, but effective, algorithm to analyse the rotational symmetry of a given closed-curve shape S is proposed. A circle C with the centroid of S as the circle center and the average radius of S as the circle radius is superimposed on S, resulting in the intersection of C and S at a set of points. By theoretical analysis, the relationship between the order N_s of the rotational symmetry of S and the number of intersection points between C and S is established. All the possible values for N_s are determined. And finally N_s is determined by evaluating the similarity between S and its rotated versions. In the proposed algorithm, only simple pixel operations and second-order moment function computation are involved. Several problems caused by the use of discrete image coordinates are analysed and solved for correct decision-making in the algorithm. Good experimental results are also included.     

大型楼宇空调自动控制系统模型选用与系统设计

本文着重从空调自动控制系统模型的选用,系统的设计以及系统的可靠性这三方面介绍空调自动控制系统的设计。