坝基岩体开挖卸荷松弛特征分析及加固措施——以锦屏一级拱坝为例

结合高地应力环境下锦屏一级坝基岩体开挖卸荷松弛特征,分析了坝基岩体开挖不同锚固措施的加固效果,并根据工程现场坝基岩体开挖锚固措施的试验成果,对高地应力环境下坝基岩体不同开挖加固方案进行了对比分析,提出了锦屏一级坝基岩体的开挖实施方案,有效地降低了开挖卸荷松弛对坝基岩体质量的二次损伤。建议在河床高地应力部位实行先锚后挖的施工程序,保护层开挖滞后时间为2~3个月。     

乳制品行业用水特性与节水措施分析

近年来我国乳制品行业迅速发展,乳品企业在为提高人民生活水平做出积极贡献的同时,也带来了高耗水量、高排水等用水问题。基于蒙牛等乳制品企业水平衡测试成果,通过深入调查乳制品企业用水工艺流程,研究了乳制品企业CIP冲洗、蒸汽杀菌、冷却等用水环节的用水规律和特点,剖析了企业用水量和排水量双高与生产工艺内在要求之间的必然联系。最后,根据研究结果给出了乳制品行业充分合理利用水资源的措施建议。     

山美水电站3号机组上导轴承旋转油槽盖板磨损毁坏原因分析及处理措施

本文通过分析泉州山美水电站3号机组上导轴承旋转油槽盖板在运行中发生磨损毁坏原因,提出了对上导轴承旋转油槽盖板进行结构改造的技术措施,取得了理想效果,可为类似结构机组的改造提供一个可借鉴的经验。     

“布-也”35kV 输电线路24号铁塔倒塔原因与对策探析

作为一种风敏感结构体系,塔—线输电结构在遇到强风条件下容易产生风振,给塔架结构安全性带来隐患,严重时易造成弯塔、倒塔事故。本文对“布—也”35kV 输电线路在极端恶劣大风条件下发生的24号铁塔倒塔原因进行了分析,并提出了几种铁塔升级、加固对策,旨在提高输电线路铁塔的可靠性和安全性。     

Predicting and controlling risks from human exposures to vibration and mechanical shock: flag waving and flag weaving

At work or in leisure activities, many people are exposed to vibration or mechanical shocks associated with risks of injury or disease. This paper identifies information that can be used to decide whether there may be a risk from exposure to hand-transmitted vibration or whole-body vibration and shock, and suggests actions that can control the risks. The complex and time-varying nature of human exposures to vibration and shock, the complexity of the different disorders and uncertainty as to the mechanisms of injury and the factors influencing injury have prevented the definition of dose–response relationships well proven by scientific study. It is necessary to wave a flag indicating when there is a need to control risks from exposure to vibration and shock while scientific enquiry provides understanding needed to weave a better flag. It is concluded that quantifying exposure severity is often neither necessary nor sufficient to either identify risks or implement measures that control the risks.Practitioner Summary: The identification of risks associated with exposure to vibration and mechanical shock cannot, and need not, rely solely on the quantification of exposure severity. Qualitative methods can provide a sufficient indication of the need for control measures, which should not be restricted to reducing standardised measures of exposure severity.     

Computing Minimum Area Homologies

Calculating and categorizing the similarity of curves is a fundamental problem which has generated much recent interest. However, to date there are no implementations of these algorithms for curves on surfaces with provable guarantees on the quality of the measure. In this paper, we present a similarity measure for any two cycles that are homologous, where we calculate the minimum area of any homology (or connected bounding chain) between the two cycles. The minimum area homology exists for broader classes of cycles than previous measures which are based on homotopy. It is also much easier to compute than previously defined measures, yielding an efficient implementation that is based on linear algebra tools. We demonstrate our algorithm on a range of inputs, showing examples which highlight the feasibility of this similarity measure.     

丹江口大坝加高施工期安全度汛方案

丹江口大坝加高工程施工将对工程度汛带来较大影响,包括新老混凝土施工、施工机械安装布置、施工交通运输以及金结机电设备运行等对施工度汛的影响。根据工程特点并结合现场实际情况,采用了多跨全钢结构栈桥度汛方案。详细介绍了2006~2013年安全度汛方案,包括施工要求和闸门启闭设备的工作情况。经过实际运行和监测,施工度汛栈桥工作性能良好,各指标均在设计控制范围内;保证了施工工期,确保了工程安全度汛。     

校园网络安全现状及防护

随着教育信息化体制的不断深入,校园网在高校中的地位越来越重要。在校园网为教师与学生带来快捷方便的同时,网络安全问题必须得到重视。针对校园网络安全的现状进行分析,提出对网络安全问题存在的一些威胁,并提出相应的防护措施,以保障校园网更好地发展。     

影响计算机网络安全的因素与防范措施分析

随着科技的发展,计算机网络时代到来,计算机技术给人们带来方便和便利的同时,也面临着一些问题,其中计算机网络安全问题成了人们讨论的问题。因为计算机网络存在于人们的日常生活当中,其是否安全关系到人们对计算机的利用程度。本文主要讨论影响计算机网络安全的一些因素,并提出一些防范措施。     

物联网中的信息安全与防范措施

随着信息化社会的不断发展,物联网以其广泛、便捷等特点备受关注。物联网的出现,为互联网的普及提供了一个良好的基础平台。物联网是继计算机、互联网之后又一信息化飞跃,将为信息化生活的加快带来极大的机遇与挑战。并且物联网共享的数据与人们的生活息息相关,这决定了物联网信息的广泛性和敏感性。对物联网中的信息安全和防范措施提出了更高的要求。