永定河军庄-三家店河段整治方案的试验研究

通过物理模型试验分析军庄-三家店河段的水流、泥沙运动，研究河床演变规律。定床试验给出了分汉河道的分流比及分流点，不同频率洪水的水位、流速、流态、流势。动床试验分析遭遇20年、50年洪水河道的冲淤演变规律，为该河段的河道整治提出相应的建议。     

Spatial Distributions of Legacy Contaminants in Sediments of Lakes Huron and Superior

The sediments of Lake Superior, Lake Huron, and Georgian Bay were sampled in 2001 and 2002 in order to evaluate the extent of surficial sediment contamination of polychlorinated biphenyls (PCBs), organochlorine pesticides (OCs), polycyclic aromatic hydrocarbons (PAHs), and metals. Sediment concentrations of PCBs, OCs, PAHs, and mercury were generally low and up to 2 orders of magnitude less than in Lakes Erie and Ontario. In contrast, concentrations of metals such as arsenic, copper, and nickel were comparable to those in Lakes Erie and Ontario. These elevated Lakes Superior and Huron metal concentrations were attributed to naturally occurring metals within the bedrock, soil, and sediment of the study region. Concentrations of all contaminants were typically below the Canadian Sediment Quality Probable Effect Level (PEL) guidelines. With regard to spatial patterns, most contaminants were focused primarily in the depositional basins and atmospheric deposition was likely the major source of these chemicals to the lakes. The major exception was for metals (not including mercury) whose patterns were also influenced by natural sources as well as extensive mining activity. A comparison between surficial sediment contamination of samples collected as part of this survey and those collected in the late 1960s/early 1970s using similar methods showed that concentrations of DDT, PCB, lead, and mercury were generally similar between these two time periods. These results are not consistent with production and usage patterns that have declined substantially in the past 3 decades. We hypothesize that the lack of temporal trends is an artifact due to slow sediment accumulation rates as well as differences in analytical protocols between the two time periods.     

肥香村水库碾压混凝土材料性能研究

开远小龙潭火电厂年排灰量约５０×１０４ｔ。由于粉煤灰中游离氧化钙（ｆＣａ０） 和有害成份三氧化硫（Ｓ０３） 含量较高，因而在云南的坝工建设中一直得不到利用。作者对元阳县肥香村水库工程拦河坝碾压混凝土材料试验的部分成果进行了初步分析，认为小龙潭粉煤灰在改性后可以作为肥香村水库工程的混凝土掺合料。这样可就近取材减少工程投资，也为小龙潭粉煤灰的应用开辟新的途径     

羊湖电站压力钢管焊接试验成果介绍

羊卓■湖抽水蓄能电站压力钢管现场焊接试验的测试结果表明，在焊接和热影响区未出现任何裂纹；尽管在热影响区内存在窄狭的脆化和软化区，但对焊接接头的承载能力没有影响．这说明施焊单位采用的焊接工艺及热处理是合理的，焊工和焊接设备经受住了高原自然环境的考验．证明了在高海拔，低气压，低温和严重缺氧的条件下，采用现场手工焊接压力钢管的方案是可行的．     

采用纵向翼形管模拟水击波速

在水击模型实验中，采用纵向翼形管是模拟水击波速的有效途径之一。为了便于确定翼缘长度，满足模型设计，本文应用结构力学方法和平面有限元方法研究了翼级长度，管壁厚度，管道半径，管材的弹模等关键参数对水击波速的影响，揭示了该结构型式的管道在内水压力作用下变形量与水击波速间的内丰规律，并将理论计算与实验结果进行了对比，两者十分吻合。     

湘江下摄司河段航道整治与行洪关系

湘江下摄司浅滩群河段的两岸具有港口、集镇和大型企业，皆有航运和取水需要；且河道的防洪也至关重要；众多的限制条件使得航道整治难度极大。通过分析和河工模型试验，提出了兼顾各限制条件的整治工程方案。工程实施后使河段达到千吨级通航标准。     

Toward a telework taxonomy and test for suitability: A synthesis of the literature

The current merging of computer and communications technologies is facilitating the trend towardtelework-remote work arrangements enabled by information technology. Organizations today have ever increasing options in the management and distribution of their work processes. In this study, we review the research on telework conducted in the United States, Western Europe, and Japan. We then propose a taxonomy for classifying different types of telework. Using this taxonomy, we examine the spatial, coordination, and temporal structures of different types of telework.Previous research results indicate that the introduction of telework is a complex process and has profound implications for the organization. However, this research critically lacks any guidance for the decision maker in determining the feasibility of implementing telework. We propose a framework for a telework suitability test to determine the appropriateness of telework, in a particular situation. This telework suitability test integrates existing research findings with future research areas.     

Historical Records of Metal Pollution in Sediments of Toronto and Hamilton Harbours

The sediments of Hamilton and Toronto Harbours contain some of the oldest records of metal pollution in the Great Lakes basin. The fluxes of Cd, Cr, Cu, Ni, Pb, Zn, Fe, and Mn into the two harbours have been estimated from the analyses of core samples dated by the Pb-210 technique. The contrasting metal levels in the two harbour sediments are viewed in relation to the differences in the disposal strategies of the dredged spoils and the sources of metal pollution in the harbours. The Zn and Fe concentrations of 5 to 8 mg g^?1 and 10 to 13 % dry wt. in Hamilton Harbour sediments, which are among the highest recorded in any harbour, can be related to effluent discharges from the large local iron and steel plants. An inventory of the sources and sinks of pollutant metals in Hamilton Bay shows a substantive export of the metals to Lake Ontario.     

电子产品研制过程的可靠性管理

为建立闭环式可靠性管理,本文从如何确定可靠性参数和指标开始,对如何进行可靠性预计、如何确定定时截尾可靠性鉴定试验方案{T,C}和开展软件可靠性定量评估等方面进行了讨论。     

万家寨水电站水轮发电机组进相试验

介绍了万家寨水电站水轮发电机组进相运行试验过程、进相运行范围和对系统的调压效果。进相试验分别在90、144、180 MW 3种不同的有功下完成,通过试验确定了机组的进相深度。