双重结构的油船能防止漏油事故吗

双重结构的油船能防止漏油事故吗包括日本在内共有１３６个国家参加的国际海事组织为了防止油船漏油事故的发生，制定了油船采用双重结构的新规定。大型油船的漏油事故破坏了海上的生态系统今年１月份，就发生二起大型油船漏油事故。１月５日，在北海的设得兰群岛南部，装...     

Joint rate control and scheduling for wireless uplink video streaming

INTRODUCTION Video streaming is becoming one of the major driving forces of next generation wireless networks. For the currently deployed cellular networks, the practical data rates are not enough to support full rate, high quality video applications. As a result, many research efforts have been devoted to adapting video content to reconcile the conflict between the high demand of video quality and the limited wireless communication resources among users. A large body of literature utiliz…     

Essential competencies for teaching students with hearing loss and additional disabilities

The purpose of this national study was to establish an initial database of the essential competencies needed for working with students who are deaf or hard of hearing with additional disabilities. Surveys were sent to program supervisors across the United States; each supervisor was asked to give the survey to a professional on his or her staff who worked with students who were deaf or hard of hearing with additional disabilities. Respondents indicated that there were 67 specific competencies needed for working with this diverse population of students. A list of the specific competencies and a rationale for providing more in-depth training for teachers is provided.     

突发事件风险媒介化：“信息疫情”的本质、演化与治理

“信息疫情”往往是突发事件次生的“第二战场”,也是防范化解重大风险的关键议题,其本质是突发事件生发演化与情境结构变异所形成的风险媒介化景观。在共时性维度上,突发事件的符号化、信息扩散的病毒化和公众情绪的势能化交融互动,共同建构了漂移、异轨和构境的景观整体;在历时性维度上,媒介化作为一种结构性和功能性力量,以风险的时空折叠、智能复制与数字计算,嵌入甚至主导着信息疫情风险景观的生发演化动态过程。信息疫情治理的关键在于把握突发事件风险的媒介化特征,在理解媒介化贯通“事件-信息-情绪”风险景观的基础上,遵循以人为本的自反性原则,从而在更广泛的意义上探索风险规避、防范与调节的应对机制。     

被沉沦吞没的理想──也谈鲁迅与进化论

被沉沦吞没的理想──也谈鲁迅与进化论星婴进化论和鲁迅前期思想的关系，是鲁迅研究中的一个老话题，自翟秋白“从进化论到阶级论”①一说发表以来，已衍生出许多不同提法。②在中国的文化观念和思维定势中，这些提法都直接或间接地把鲁迅的进化论表述为一种历史观。现在...     

答《〈历史的风云 时代的烙印〉读后小议》

我写的关于学习鲁迅诗歌一文,本意不在“求同”,而在“存异”。我觉得学术讨论,总要提出一些自己的观点,至于这些观点是否正确,任何人(包括我自己)都可以在“双百”方针的鼓舞下参加争鸣。如果我错了,引来了正确的意见,那就起了“抛砖引玉”的作用,错误成了正确的先导,也不无贡献。因此,我对于读者来信表示欢迎。当然,所谓欢迎,并不是承认读者的意见就全部正确,作者与读者之间仍然可以开展“百家争鸣”。读者来信的论据,主要是鲁迅说的“倘要论文,最好是顾及全篇,并顾及作者的全     

定西之行:一堂生动的师德教育课

这是一次刻骨铭心的定西之行．这是一堂最生动的师德教育课。是它,教会了我们要珍惜现在所拥有的生活．要努力地工作．不断追求卓越:是它．教会了我们要明确自己肩上的重任．要用智慧和爱培养更多的栋梁之才．让更多的乡村孩子能通过知识来改变命运。     

"信使"号飞船启程前往水星

北京时间2004年8月3日下午2时16分,美国“信使”号飞船从佛罗里达州卡纳维拉尔角空军基地启程,前往水星。飞船将在太空遨游79亿千米,于2011年3月进入环水星轨道,对水星展开为期至少1年的科学探测。它是美国宇航局向水星发射的第一艘探测飞船。通过“信使”号此次水星之行,科学家希望了解“水星密度为何如此之大”、“水星有过怎样的地质史”、“水星内核结构如何”、“水星磁场有何特性”、“水星两极到底存在什么不寻常的东西”、“水星上哪些挥发物至关重要”等六大问水星资料作为太阳系九大行星之一的水星,比月球稍大,但重量却和地球相当…     

Child sexual abuse in Tanzania and Kenya

OBJECTIVE: Most research on child abuse in Tanzania and Kenya is unpublished in the international literature. The purpose of this paper is to examine the various commentaries and reports extant, toward an overview of the nature and frequency of child sexual abuse in Tanzania and Kenya. METHODS: Contacts were made with academics, government departments, NGOs, and UN agencies. This was followed by a field trip in the summer of 2001 where all available reports were examined and a wide range of interviews conducted. RESULTS: Little empirical data exist on child sexual abuse in Tanzania. It is widely perceived that it may be increasing as a result of AIDS sufferers' attempts to "cleanse" themselves. The breakdown of traditional childcare systems, foreign influences, poverty, and the lowly position of girls in society are also implicated. More research has been conducted in Kenya. It is clear that first coitus occurs at a young age for many Kenyan children and adolescents. Also, a degree of force, trickery, or material exchange is not uncommon in adolescent sexual relations. CONCLUSIONS: Child sexual abuse is under-researched in Tanzania and Kenya. Studies by UN agencies such as United Nations Children's Fund (UNICEF) and the International Labour Organisation (ILO) have focused on the commercial sexual exploitation of children, to the neglect of more pervasive abuse in children's own communities by family, relatives, and neighbors. Nationwide surveys of the general population are required for an empirical understanding of this topic. Given the high incidence of AIDS/HIV in both countries, it is important to know if the epidemic is increasing the risk of rape or incest for children.     

探讨化合价计算新题型的解法

化合价计算的新题型不断出现,为此,结合近年来的中考化学试题,探讨其解题的方法,以对读者有所启发.