团聚浮选在废纸脱墨中的应用

废旧杂志纸越来越多,如何充分地利用这些废纸,是当今世界的热门话题之一。在碎浆的过程中,油墨会产生碎化,而这些碎化的油墨粒度小,易沉积在纸纤维上,用常规的脱墨方法难以脱除,在油墨碎解时加入少量的油酸作为成桥液,疏水亲油的油酸优先润湿油墨表面,油墨颗粒之间通过油桥而团聚,然后浮选脱除,试验获得白度81.90%、纸纤维回收率92.68%的指标。     

拉伸牦牛绒复式纱加工技术

主要介绍了自主开发的TJGD-QHXZSR-09型绒毛拉伸机,包括自动喂入、预处理、拉伸、定形和烘干部分,能够对长度较短的牦牛绒等纤维条实施连续加工。介绍了一种复式加工纺纱系统的改造措施,主要技术要点包括:并条机的复式条成形改造;粗纱机及细纱机复式纱成形的加工技术;分析了有捻粗纱机和无捻粗纱机对细纱机喂入的影响。并将拉伸牦牛绒纤维在改造的半精梳绒毛复式加工系统上开发了10.4 tex×2×2复合股纱线。经过织片试验表明,产品抗起毛起球性能明显提高。     

关于办好《超硬材料工程》期刊的几点思考

超硬材料行业是一个快速发展、前景光明的行业;以服务整个行业为宗旨的《超硬材料工程》杂志存在着机遇和挑战。文章从《超硬材料工程》的办刊宗旨出发,结合行业的发展现状和未来,提出了办好期刊的一些观点和方法;认为办刊应该坚持质量至上的原则,注重个性发展,加强制度管理和编辑队伍建设,把期刊办成具有行业特色,专业性、先进性和可读性相结合的优秀期刊。     

某新型自动防暴枪自动机动力学仿真

为了解决某新型自动防暴枪霰弹弹匣供弹难的问题,设计了独特的供弹结构.进行了物理样机试制,开展了实弹试验,验证了结构设计的可行性和工作循环的可靠性.基于SolidWorks三维建模软件和ADAMS/VIEW多体动力学仿真软件,建立了该新型自动防暴枪的虚拟样机模型,进行了自动机工作循环的动力学仿真.对不同枪机框部件质量、导气活塞面积、自动机与机匣摩擦因数和复进簧预压力多种工况下的自动机工作特性进行了研究,为该防暴枪的进一步改进设计提供了依据.     

一种立式弹丸回转自动弹仓设计

针对链式回转弹仓的链式回转结构存在多边形效应比较突出的问题,设计一种立式弹丸回转机构的自动 弹仓。采用多个链节对应一个储弹筒的方式,减小输送链所用链节的节距,进而减小回转弹仓的多边形效应及动载 荷,提高弹丸传送的平稳性和准确性;在低速转动和高速转动2 种不同情况下,对立式弹丸回转弹仓传送一发弹丸 的运动过程进行动力学仿真。结果表明：弹丸横向运动误差小,纵向跳动量小,满足运动平稳、传输可靠的要求。     

极端温度环境中舰船弹库传热技术研究

根据《GJB1060.2-1991舰船环境条件要求-气候环境》标准,建立了舰船弹库在高温日照环境与极端低温环境下的传热模型。将太阳辐射和环境温度转化为综合温度,对弹库内部流场进行了流固耦合的二维计算仿真,分析了弹库内部温度在高温日照环境中的连续性变化以及在低温环境中的分布情况。仿真结果表明弹库具有良好的隔热保温性能,所做研究可以为舰船弹库的设计和使用提供决策参考依据和技术支撑。     

The acquisition of conditioned responding.

This report analyzes the acquisition of conditioned responses in rats trained in a magazine approach paradigm. Following the suggestion by Gallistel, Fairhurst, and Balsam (2004), Weibull functions were fitted to the trial-by-trial response rates of individual rats. These showed that the emergence of responding was often delayed, after which the response rate would increase relatively gradually across trials. The fit of the Weibull function to the behavioral data of each rat was equaled by that of a cumulative exponential function incorporating a response threshold. Thus, the growth in conditioning strength on each trial can be modeled by the derivative of the exponential—a difference term of the form used in many models of associative learning (e.g., Rescorla & Wagner, 1972). Further analyses, comparing the acquisition of responding with a continuously reinforced stimulus (CRf) and a partially reinforced stimulus (PRf), provided further evidence in support of the difference term. In conclusion, the results are consistent with conventional models that describe learning as the growth of associative strength, incremented on each trial by an error-correction process. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Henri Cartier‐Bresson Reinterprets his Career

Between 1952 and 1974, Henri Cartier‐Bresson significantly revised his understanding of himself as a photojournalist. This article analyses that change through close readings of his book, The Decisive Moment (1952), an interview in Le Monde (1974), and other published statements and unpublished letters by Cartier‐Bresson. It draws on interviews and correspondence with his widow Martine Franck, with his friend and representative Helen Wright, and with associates at Magnum Photos. It argues that what appears from a superficial reading of the interview to be a rejection of photography and photojournalism was in fact Cartier‐Bresson's first public expression of a long‐simmering opposition to the consumer society – which he as an ecologist strongly opposed – and to fashion and advertising photography, which he believed promoted unnecessary consumption. It concludes that Cartier‐Bresson reinterpreted his past by seeing himself as a surrealist to the denial of having done photojournalism. The article is predicated on the belief that understanding the change in Cartier‐Bresson's own conception of his work is essential to a full understanding of it.     

Production planning of FMS under tool magazine constraints: A dynamic programming approach

Production planning is one of the most important activities for efficient operation of a flexible manufacturing system. This complex acivity is concerned with the decisions related to system set-up, involving solving the problems of selection of a set of part types for simultaneous processing, determining the production ratios, assigning the pallets and fixtures, and assigning operations and tools to machines. In this paper, a dynamic programming algorithm is developed to solve the above problems simultaneously by considering the flexibilities and constraints of the system in order to minimise the unbalanced workload of machines. In this context, various factors such as the tools required for operations, alternative routes available for operations, tool magazine capacity and the limited number of pallets and fixtures are considered. The method is validated with a case study.Notation B a large number - i part type,i=1,...,N - o operation,o=1,...,O _i - k machine,k=1,...,K - j stage,j=1,...,N (N is maximum number of stages required, i.e. equal to the number of part types) - n indicates the number of parts to be introduced into the system (represents the state in DP),n=j,...,nmax. In stagej at least one number of each part type should be introduced into the system. The maximum number of parts can be a user defined maximum,nmax. - P _iok processing time of part typei, operationo on machinek - OA _io set of operation alternatives available for part typei, operation - o an alternative consists of machine number, tool number along with its processing time - pw _ik average workload required by a part typei on machinek - a _i number of parts (ratio) of typei - f _i number of fixtures available to part typei - S(j) {S ₁(j),S ₂(j),...,S _p (j),...}, whereS _p (j) ispth set of selected part types with cardinalityj - |S(j)| ^N C _j - W _k a constant, indicating the average unbalanced workload on a machinek and is a user defined value - L _j,k (S _p (j),n,a _i ) load of machinek at stagej when selection isS _p (j), number of part types isn, and number of parts of type isa _i - L* _j,k (S _p (j),n) load of machinek in stagej at minimum unbalanced workload when selection isS _p (j) and number of parts in system isn - F _j (S _p )(j),n,a _i ) unbalanced workload of all machines at stagej, when selection isS _p (j), number of part types isn, and number of parts of type isa _i - F _j (S _p (j),n) minimum unbalanced workload of all machines, whenS _p (j) is the set of selected part types andn is the number of parts in the system     

对《大坝与安全》公开发行两年来现状的分析与思考

从导向性和学术性两个方面对《大坝与安全》公开发行两年来的论文刊发情况统计用数据做了一个分析，对重点选题，专栏设计，专辑出版等编辑思路做了一个简要介绍，同时提出切实“为上级服务，为读者服务”的工作理念，并明确了近年期刊的努力方向。