ADCP数据综合处理方法及软件系统研制

由于仪器本身的限制和水文测验的实际需要,ADCP自带的数据处理软件WinRiver需要同时解译若干个R文件,并对解译数据进行垂线时间和空间插值,才能获得整点时刻特定起点距的垂线数据。为了弥补上述不足,通过对ADCP原始文件R文件进行解译,并根据ADCP数据处理的理论,研制了ADCP数据处理软件系统。该系统在长江口水文测验的实际应用效果表明,软件在数据的预处理和后处理方面均取得了良好的效果,可以进一步推广。     

1990年国内聚氨酯工业概况

简单评述了我国1990年聚氨酯生产、消费结构和新产品的研究状况。内容包括多元醇、异氰酸酯、助剂、软质和硬质泡沫、弹性体和合成革、涂料和复合涂料、粘结剂和密封剂、加工设备等。     

Tracking Configurable Culture From the Margins to the Mainstream

In this study, we analyze data from surveys conducted in 2006 and 2010, tracking changes in awareness, engagement and attitudes surrounding emerging digital cultural forms over this 5‐year period. Our analysis, based on results from thousands of adults around the globe, shows that not only have remixes, mashups and other forms of “configurable culture” become mainstream phenomena, but also that the attitudes surrounding their cultural legitimacy are shifting. While copyright industries still promote a binary theft/permission framework, many people acknowledge the validity of some appropriation, and are actively negotiating the law's limitations. Yet, those most engaged in challenging dominant copyright narratives and exploring these emergent forms are those who hold the reins of cultural power: the young, educated and wealthy.     

高职计算机应用技术专业就业需求调查分析

调查分析了高职院校计算机应用技术专业的就业需求现状,调查对象为随机选取的用人单位,调查内容主要包括就业岗位、需求人数、薪资待遇和就业岗位素质等。调查结果发现高职计算机应用技术专业就业需求状况处于供不应求的状态,据此提出了可行性建议。     

The locomotive assignment problem: a survey on optimization models

The objective of the locomotive assignment problem (LAP) is to assign a fleet of locomotives to a set of trains while satisfying a rich set of operational and budget constraints and optimizing one or more crucial objectives. This paper presents a survey on optimization models for this class of scheduling problems. Depending on the context of application, the kind of model used to solve the LAP varies; accordingly, this influences the solution methodology and algorithms used. In this paper, we review and also suggest a classification of the various models.     

Android安全综述

Android是一款拥有庞大市场份额的智能移动操作系统,其安全性受到了研究者的广泛关注.介绍了Android的系统架构,分析了Android的安全机制,从系统安全和应用安全2个角度对其安全性能和相关研究进行了讨论.Android系统安全包括了内核层安全、架构层安全和用户认证机制安全3个方面.内核层和架构层的安全威胁主要来自于安全漏洞,内核层的安全研究集中于将SELinux引入内核层以增强安全性能,架构层的安全研究集中于权限机制的改进和应用编程接口(application programming interface,API)的安全实现、规范使用.用户认证机制直接关系到整个系统的隐私数据安全,实现方式灵活多样,得到了研究者的广泛关注.Android应用安全的研究包括了恶意应用检测和漏洞挖掘2项技术,对恶意应用的伪造技术、应用安装时恶意应用检测技术和应用运行过程中实时行为监控技术进行了讨论,对组件暴露漏洞和安全相关API的调用漏洞2类漏洞的相关研究进行了介绍.最后,总结了Android安全研究现状,讨论了未来的研究方向.     

云计算反取证的关键技术及其应用

云计算技术的迅猛发展,其带来的商业运营和信息服务模式的变化,为越来越多的企业所接受后,作为信息系统核心的数据中心也开始一步步地朝着云计算数据中心发展。在云计算环境下,云计算信息系统主要由云计算数据中心和用户端组成。数据中心是核心,是大脑,是所有资源汇集之处,是信息的枢纽,它通过网络向企业或公众提供信息服务。本文将结合云计算关键技术,对计算机反取证技术进行研究,有利于计算机取证人员的取证有效性。     

勘察设计企业信息系统安全体系建设

随着信息化程度的提高,勘察设计企业对网络和信息技术的应用程度越来越深入,越来越多的数据、流程、知识成果以电子文档的形式储存于各类信息系统中.依据网络安全理论体系和技术,结合某勘察设计企业实际,以管理为基础,以技术为手段,探讨建立实用的勘察设计企业信息系统安全体系.     

A literature survey and an experimental study of coal devolatilization at mild and severe conditions: influences of heating rate, temperature, and reactor type on products yield and composition

Coal devolatilization studies to maximize the yield of condensable products by operating at elevated temperatures and heating rates have been published. The objectives of this study were to investigate the influences of relatively mild operating conditions (e.g. relatively low temperature and pressure) on product quality, by comparing devolatilized products obtained at various temperatures and heating rates. Fixed bed, fluid bed, and entrained flow reactor units were used to obtain pyrolysis products. In addition, literature data on tar yields in various reactor units at a range of temperatures and residence times were surveyed and compared with experimental data. The liquids were characterized by a number of techniques, including field ionization mass spectroscopy (f.i.m.s.), sequential elution solvent chromatography (s.e.s.c.) and elemental analysis. The results demonstrate that the quality and yield of liquids obtained at a rapid heating rate are functions of peak pyrolysis temperature. It was shown that at a rapid heating rate, the yields of heavier polyfunctional groups (i.e. hydrocarbons with greater mean molecular weight) are greater than those obtained in the fixed bed slow heating rate reactor. The liquids generated at a slow heating rate are of lower molecular weight, viscosity, and sulphur content, and of higher H/C atomic ratios compared with the liquids obtained in a rapid heating rate unit. The effect of increasing the maximum pyrolysis temperature (at a constant slow heating rate) was to increase the yield of light gases (mainly H) at the expense of char hydrogen content and char reactivity. The tar yield is not markedly influenced when the peak devolatilization temperature is increased at a relatively slow heating rate. However, the quality (as defined by the H/C (atomic) ratio) of the liquids, and the reactivity (in air) of char, was reduced when the peak pyrolysis temperature was increased. At a rapid heating rate, the primary products, which have many structural characteristics of the parent coal, are devolatilized. The quality of the liquids obtained at a rapid heating rate is, therefore, determined by the devolatilized primary coal fragments evolved at the devolatilization temperature. In a slow heating rate fixed bed unit, however, the primary coal fragments undergo additional cracking reactions which involve stabilization of free radicals by donatable hydrogen. This leads to the formation of low molecular weight hydrocarbons of relatively higher quality. In-situ (both intraparticle or extraparticle) stabilization of reactive coal fragments by donatable hydrogen may lead to a significant improvement in the overall quality of the pyrolysis liquids in a fixed bed system in which time-temperature history is conducive for such reactions.     

基于抽样调查的高职教师科研素质现状实证分析

以部分高职院校教师的问卷调查的数据结果为依据,分析目前高职教师的科研素质问题。调查分析结果表明,高职教师科研兴趣整体上偏低,科研成果质量和档次不高,不少教师对科研方法掌握不够,科研处理问题的方式欠妥。因此,高职教师要增强科研意识,改进科研方法,加强学习培训,提升科研素质和水平。