广西锡多金属大地构造成矿演化、分带与找矿方向

广西锡多金属成矿系统是一个不同时代成矿体系的亲缘性谱系。富含Sn等成矿元素的变质基底和古老岩浆岩组成的地球化学块体是成矿的物质基础,大地构造活动是成岩成矿的动力来源。Sn等成矿元素以不同的形式多阶段聚集成矿,表现出螺旋式不均衡的发展性和继承性,在燕山期和藏南期达到成矿高峰。广西可分为四堡—雪峰期桂北、燕山期桂东北-桂东南和藏南期桂西北一桂西南3大锡多金属成矿带。锡多金属战略找矿的重点是桂西地区,该区具有上金下锡的“双层成矿”模式。寻找“大厂式”超大型矿床的方向应放在桂西藏南期3个锡多金属成矿亚带上,其中重点是桂西南锡多金属成矿亚带。     

Fabrication of integrated resistors in printed circuit boards

In order to utilize integrated passive technology in printed circuit boards (PCBs),manufacturing processing for integrated resistors by lamination method was investigated.Integrated resistors fabricated from Ohmega technologies in the experiment were 1 408 pieces per panel with four different patterns A,B,C and D and four resistance values of 25,50,75 and 100 Ω.Six panel per batch and four batches were performed totally.The testing was done for 960 pieces of integrated resistors randomly selected with the s...     

广西珊瑚钨锡矿田成矿地球化学机理及成矿模式

珊瑚钨锡矿田产出有钨锡石英脉、钨锑萤石石英脉和含钨石英角砾脉3种类型。以长营岭隐伏花岗岩为中心,自东往西、自深部到浅部形成单侧水平分带和垂向分带,它们属同一成矿系列。成矿时,成矿流体由富含W,Sn等成矿元素及F,B等运矿元素的高中温、酸性、高fs_2、低fo_2、类硫酸盐型的岩浆水,逐渐转化为有地下水掺和的富含Cl、中低温、弱酸-中性、高fo_2、低fs_2、类氯化物型的混合流体。成矿物质由岩浆提供逐渐转化为主要由地层提供。该成矿系列的形成是成矿流体不断演化的结果,属多源多因复成矿床。     

纳米TiO2的有机表面改性及其在环保功能涂料中的应用

综述了纳米TiO2的有机表面改性方法及其在抗菌、空气净化、紫外线防护等环保功能涂料中的应用，并指出了纳米TiO2环保功能涂料的研究方向和发展前景。     

SNOS：一种传感器网络操作系统的设计与实现

传感器网络是一种新型的网络信息系统，其独特的特点包括：它是一个自组织网络，其运行和应用服务以传感器数据及数据聚合为中心，中间结点与信息服务紧密融合等．这些特征为操作系统研究领域提出了新的课题．本文提出了一种传感器网络操作系统一SNOS（Sensor Network Operating System），该操作系统以满足传感器网络的特点和需求为目标设计完成．本文论述了SNOS系统的结构和设计，系统资源机制和运行管理机制，介绍了SNOS系统任务实现的模拟试验和系统原型在煤矿井下初步应用的情况，为传感器网络操作系统的设计研究提供了思路和参考．     

THE DEGRADATION OF CHlTOSAN WITH THE AID OF LIPASE FROM RHIZOPUS JAPONICUS FOR THE PRODUCTION OF SOLUBLE CHlTOSAN

Lipase from Rhizopus japonicus degraded chitosan resulting in soluble chitosan hydrolysates with molecular weight of about 30–50 kDa as shown by size exclusion chromatography. Optimal temperature for the hydrolysis of chitosan was 40C. The chitosan degradation products were fractionated stepwise according to their molecular weights by ultrafiltration with the filtration range of over 0.1 μm, 0. l μm to 30 kDa, 30 kDa to 10 kDa, 10 to 3 kDa, and 3 to 0.2 kDa. These fractions exhibited molecular weights of 50, 41, 41, 35, and 30 kDa, respectively. The molecular weights did not coincide with the pore size of filter membranes. Chitosan hydrolysate exhibited almost the same structural composition in IR spectra as chitosan flakes, except the peak of 1550 nm^?1 that appeared to be the COO residue shifted from sodium acetate buffer to amine residue of chitosan. All fractions showed high solubility at neutral pH. The chitosan hydrolysates exhibiting molecular weights between 30 and 41 kDa were considered to be most suitable as a food additive or functional agent as demonstrated by sensory evaluation.     

Identifying the driving factors of successful megaproject construction management: Findings from three Chinese cases

The construction of megaprojects has always resulted in extensive and long-term impacts on the society. However, the performance of megaproject management is poor, and improving it remains an urgent and necessary issue. Although many studies on megaproject success have been conducted, existing studies on the driving factors of successful megaproject construction are rather limited. Therefore, this study aims to systematically explore the key factors that can lead to successful megaproject construction management based on three cases: The Beijing–Shanghai High-Speed Railway, the Three Gorges Dam, and the Hong Kong–Zhuhai–Macao Bridge. Mixed research methods, such as literature review, case studies, and expert interviews, were used in this study. Consequently, 11 driving factors, namely, government support, public support, accumulation and application of technology and experience, development and innovation of technology, innovation and application of management system, organizational mode and structure, top management support, project culture, megaproject citizenship behavior, corporate reputation, and fulfillment of social responsibilities, were identified and grouped into five categories, namely, project environment, construction capabilities, organization, positive culture and behavior, and requirements for sustainable development. The contributions of this study lie in two aspects. First, the driving factors of successful megaproject construction are identified to deepen the understanding of industrial practitioners, assist them in focusing on key factors, and aid them in effectively managing megaprojects. Second, researchers could use the identified driving factors in conducting further empirical studies and apply them in future projects to enhance their chances of success.     

INTELLIGENT SYNTAX-DIRECTED EDITOR THAT MODELS USER PROFICIENCY

Current interactive software systems try to offer many features and a user-friendly interface to aid the user. However, where one system may suit one user, another user may find it difficult to use, because each user is different. User modeling techniques have been applied to make a system suitable for different users. This paper surveys research works for developing interactive systems that use user modeling techniques. After presenting the systems and techniques, we introduce a system called the Intelligent Syntax-Directed Editor (ISE) as an example to show how this approach can benefit the user as an intelligent tool. The ISE assists the user in (1) using the editor more efficiently through ISE's active suggestions and on-line help and (2) program development through the syntax-directed editor. In applying user modeling techniques, ISE builds a profile/model of the user and, based on this model, ISE offers a suitable amount of help and advice depending on the proficiency of the user toward the system. The ISE is implemented on a VAX/780 computer to demonstrate its ability to volunteer advice     

An intelligent online fault diagnostic scheme for nonlinear systems

An online fault diagnostic scheme for nonlinear systems based on neurofuzzy networks is proposed in this paper. The scheme involves two stages. In the first stage, the nonlinear system is approximated by a neurofuzzy network, which is trained offline from data obtained during the normal operation of the system. In the second stage, residual is generated online from this network and is modelled by another neurofuzzy network trained online. Fuzzy rules are extracted from this network, and are compared with those in the fault database obtained under different faulty operations, from which faults are diagnosed. The performance of the proposed intelligent fault scheme is illustrated using a two-tank water level control system under different faulty conditions .     

Making video mundane: intellectual disability and the use of camcorders

Models of disability assume that impairments have only a limiting effect on technology usage. Drawing upon the results of a year-long participant observation study of the use of camcorders by six severely intellectually disabled adults, we argue that intellectual disability (ID) affects the domestication of technology in a more complex and interwoven fashion. The observed group of ID adults attended a weekly 2-h session, organised by a local day centre, in which they would make videos at local locations. There were two main aspects of appropriation in this context. One is the role of the support worker (SW) in mediating many of their interactions due to accessibility problems with the camcorder. While these interventions by the SW allowed them to use the camcorder, they also slowed their interactions with it making them less direct. SW also guided and constrained their early encounters with the camcorders, strongly influencing the environment of appropriation. The second aspect is the way the group transformed the camcorder into two tools during the course of the study: an ‘artistic’ tool for visual exploration, and a ‘social’ tool that participated in the group’s social activities. These appropriations are very different to anything reported in the literature on mainstream camcorder use. While technologists typically model disability as a set of functional limitations, we would argue for broader models that consider the wider social and support aspects of ID, recognising the different ways in which they may choose to make a technology mundane for them.