221 research outputs found

    磷酸盐氧同位素在有机磷降解研究中的应用

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    磷的有机化合物广泛分布于土壤和水体中,发挥着重要作用的同时,也给环境带来潜在的污染。研究有机磷化合物的磷循环过程对于防控磷的污染有着重要作用。磷酸盐中的氧同位素作为一种地球化学的示踪剂,近年来被广泛应用于研究磷在自然界中的循环过程。本文总结了磷酸盐中氧同位素的应用原理以及其在有机磷降解和溯源方面的应用,并在此基础上展望本领域下一步的工作重点。中国国家自然科学基金(41173113);;中国环保部公益项目(201509049

    On the Establishment of a Fund Guarantee System for Emergency Response Mechanism to Shipboard Oil Spill in China

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    梅宏,中国海洋大学法政学院副教授,博士,研究方向:海洋法,环境法,厦门大学法学博士后流动站研究人员,中国法学会环境资源法学研究会理事。电子邮箱:[email protected]。 陈志英,女,潍坊学院法学院讲师,研究方向:刑法学,环境法学。[文摘]我国在应急处理船舶溢油事故时,由于缺乏基金支持,导致事故发生后有关单位为快速启动溢油应急反应机制而付出的开支得不到及时补偿。船舶溢油应急反应资金保障制度的缺失,直接影响船舶溢油应急反应工作的开展和溢油应急反应能力的提高。构建船舶溢油应急反应机制资金保障制度的设想,应包括基金的来源、适用范围、基金的管理、申请及支付程序等。[Abstract]In China,the organizations involved in starting the emergency response mechanism to cope with ship oil spillage cannot be compensated timely for their relevant expenditures,due to the lack of fund to deal with emergencies of this kind,which in turn results from the lack of the guarantee system of the fund.The immediate consequence of the lack of guarantee system is the inefficiency and retardedness of emergency responses to ship oil spillage.The concept of establishing a fund-guarantee system consists of the sources of the fund,its coverage and administration,the procedures of application and payment,among others

    化学信息学网络考试系统的构建

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    在WindowsNT 4 .0服务器建立化学信息学的Access试题数据库 ,使用ASP编写网络考试系统 ,供学生在Internet上使用浏览器进行在线考试。该系统安全可靠、应用范围广 ,是发展远程教育的重要工具

    The Development of a New Type of Medical Rehabilitation Brace for Lower Limbs

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    本文阐述了一种新型医用下肢康复支具的研制过程。该装置主要由承重装置、负重装置、负重调节装置以及压力检测装置等结构组成,具有调节、设定以及控制负重载荷等功能,可使行内固定术后的下肢骨折患者早期进行负重、行走功能锻炼,促进其骨折愈合及肢体功能康复,减少术后并发症,具有一定的实用价值。The paper expounded the development of a new type of medical rehabilitation brace for lower limbs. The device was mainly composed of different structures including the hip weight-bearing device, the foot weight-bearing device, the weight-bearing adjustment device and the pressure detection device. The brace was designed to allow patients to carry out weight-bearing exercises and walking exercises in early postoperative period after receiving internal fixation of lower limb fracture. It could also promote fracture healing and functional recovery of lower limbs and reduce postoperative complications, which is of certain clinical value

    目标跟踪的视觉注意计算模型

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    借鉴心理学中有关视觉注意的研究成果,提出一种应用于视频图像序列的注意焦点计算模型。针对Itti 模型算法计算复杂度高、 运算速度慢等缺点,通过对注意焦点的跟踪来降低计算量,实现注意焦点的实时监测。利用相邻帧之间的相似性,通过加权颜色直方图, 以最大匹配度作为预测模型,得到下一帧注意焦点的位置。实验结果表明,该注意焦点计算鲁棒性较好,可以满足动态场景实时监测的 需要。国家“863”计划基金资助项目(2006AA 01Z129);国家 自然科学基金资助项目(60672018

    Visual Attention Computational Model Based on Tracking Target

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    中文摘要:借鉴心理学中有关视觉注意的研究成果,提出一种应用于视频图像序列的注意焦点计算模型。针对Itti 模型算法计算复杂度高、运算速度慢等缺点,通过对注意焦点的跟踪来降低计算量,实现注意焦点的实时监测。利用相邻帧之间的相似性,通过加权颜色直方图,以最大匹配度作为预测模型,得到下一帧注意焦点的位置。实验结果表明,该注意焦点计算鲁棒性较好,可以满足动态场景实时监测的需要。 英文摘要:This paper proposes a model of the focus of attention in video sequences. The Itti model has the complex and slow computation, so it reduces computation to monitor the focus of attention through tracking the focus of attention. It uses the similarity between the adjacent frames,establishes the color histogram, selects the maximum similarity as predicable model, and gets position of the focus of attention in the next fame. The experimental results indicate that this model is effective in robustness and real-time.基金项目:国家“863”计划基金资助项目(2006AA 01Z129);国家自然科学基金资助项目(60672018

    Analysis of genetic variability of Castanopsis hystrix by rbcL gene sequences

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    通过PCR扩增得到10个红锥品系的rbcL基因全序列,均为1.513 kb.核苷酸序列比对结果表明,在256-1 455 bp区间10个红锥品系共有16处碱基发生变异,变异率为1%,其中在306 bp和634 bp处10个红锥品系较同属对照castanopsis lucida均发生相同的变异,可以看作属内进化信息碱基.对表达的氨基酸序列进行比对分析,发现16处碱基变异共引起8处氨基酸序列变异.The rbcL gene sequences of 10 assassin of Castanopsis lucida were analyzed by PCR,and sixteen mutations in 256-1 455 bp were found,the mutation ratio was 1 %.Compared to Castanopsis lucida,between 306 bp and 634 bp,they had two characteristic mutations of their own,so it was different from Castanopsis lucida.Compared to Castanopsis lucida,8 amino acid variations were found,caused by 16 point mutations.广西林业科学研究院国家林业局中南速生材繁育重点实验室开放基金课题;; 兰州理工大学博士基金(SB08200602);; 甘肃省教育厅研究生导师基金( 0703-11)

    恙螨与恙虫病立克次体的系列研究

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    恙虫病是由感染恙螨幼虫叮咬人体传入恙虫病立克次体所致的急性传染病。地里纤恙螨和小板纤恙螨分别为 我国南方和北方的主要传播媒介。近年来,新、旧流行区的恙虫病陆续发生、疫情上升。本课题系为进一步控制恙虫病的流 行,对我国主要媒介地里纤恙螨的一些生物学特征和恙虫病立克次体进行了系列研究,包括 : ①地里纤恙螨射线诱发突变、种 株杂交、种株染色体与氨基酸测定;②恙螨人工接种恙虫病立克次体及其阳性恙螨模型的建立;③恙螨体内恙虫病立克次体 的分离、检测及其效果;④恙螨、鼠宿主和患者体内恙虫病立克次体动态及其传病关系;⑤恙螨、鼠宿主和患者体内恙虫病立 克次体株型特异性基因序列的扩增、鉴定及克隆

    Luminescence of Strain Compensated Si/Si_(0.62)Ge_(0.38) Quantum Well Grown on Si_(0.75)Ge_(0.25) Virtual Substrate

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    由于SI/SIgE异质结构的带阶差主要发生在价带,为实现高效率的发光,本文从理论上设计了在硅基SI1-XgEX虚衬底上外延应变补偿的SI/S1-ygEy(y>X)量子阱的能带结构,将量子阱对电子的限制势垒提高到100MEV以上。在实验上,采用300℃生长的gE量子点插入层,制备出薄的SIgE驰豫缓冲层(虚衬底),表面gE组份达到0.25,表面粗糙度小于2nM,驰豫度接近100%。在我们制备的SIgE缓冲层上外延了应变补偿SIgE/SI多量子阱结构,并初步研究了其发光特性。In this paper,band structures of strain compensated Si/S_(1-y)Ge_y(y>x) quantum well grown on Si_(1-x)Ge_x virtual substrate was design to enlarge the conduction band offset up to 100meV for improving luminescence.The fully strain-relaxed Si_(0.75)Ge_(0.25) virtual substrate was prepared by inserting a low-temperature Ge islands layer in ultra-high vacuum chemical deposition.The root-mean-square surface roughness of the virtual substrate is less than 2nm.The luminescence of the strain compensated Si/SiGe quantum well on the virtual substrate was investigated.国家重点基础研究发展计划资助项目2007CB613400;国家自然科学基金资助项目(60676027;50672079

    社会系统工程与国家治理体系现代化

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    2014年3月30日,中国人民大学国家发展与战略研究院社会系统工程研究中心成立暨“社会系统工程与国家治理体系现代化“学术研讨会在中国人民大学逸夫会堂第一会议室举行,来自十余所高校和学术团体的专家、学者和一些媒体的代表参加了会议。现把会议主要发言内容选载如下
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