Rolling Mill Reel Drives

During the past few years there has been significant progress in the technology and hardware available to the electrical engineer. Accordingly, drive capabilities and limitations have changed, justifying a restating of application criteria pertaining to reel drives. As an aid in specifying and utilizing reel drives, this paper discusses application techniques and guides based on today's technology.     

Integrating perceptual and cognitive modeling for adaptive and intelligent human-computer interaction

This paper describes technology and tools for intelligent human-computer interaction (IHCI) in which human cognitive, perceptual, motor and affective factors are modeled and used to adapt the H-C interface. IHCI emphasizes that human behavior encompasses both apparent human behavior and the hidden mental state behind behavioral performance. IHCI expands on the interpretation of human activities, known as W4 (what, where, when, who). While W4 only addresses the apparent perceptual aspect of human behavior the W5+ technology for IHCI described in this paper addresses also the why and how questions, whose solution requires recognizing specific cognitive states. IHCI integrates parsing and interpretation of nonverbal information with a computational cognitive model of the user which, in turn, feeds into processes that adapt the interface to enhance operator performance and provide for rational decision-making. The technology proposed is based on a general four-stage interactive framework, which moves from parsing the raw sensory-motor input, to interpreting the user's motions and emotions, to building an understanding of the user's current cognitive state. It then diagnoses various problems in the situation and adapts the interface appropriately. The interactive component of the system improves processing at each stage. Examples of perceptual, behavioral, and cognitive tools are described throughout the paper Adaptive and intelligent HCI are important for novel applications of computing, including ubiquitous and human-centered computing.     

Creating an effective security risk model for outsourcing decisions

Globalisation has had a fundamental impact on the way that business is conducted and approaches to sourcing work have evolved. Outsourcing is here to stay and the proportion of worldwide spend in this market-place will continue to rise. BT’s security community has successfully introduced a new risk model and supporting process to identify the key risk factors applicable to outsourcing, namely, specific environmental conditions, the number of third party personnel involved in the contract and the level of ‘trust’ given to these personnel. The importance of protective monitoring and audit regimes is highlighted from both a compliance and assurance perspective — and is being used to create effective engagement with outsourcing partners to raise security thresholds and discuss security issues. Globalisation, coupled with the requirement for more open networks, will continue to increase in the future and result in corporate infrastructure fragmentation and the breaking down of traditional boundaries. At the same time, approaches to security must also evolve — moving the focus from the infrastructure to the client, application and eventually the data level.     

Simulating particle agglomeration in the flash smelting reaction shaft

A steady-state, axi-symmetric, numerical model was developed to investigate the agglomeration of molten particles of sulphide ore in the reaction shaft of a flash smelting process used for extracting copper. The turbulent, particle-laden, gas flow was simulated in conjunction with a population balance model to account for agglomeration. The agglomeration was found to depend primarily on the particle to gas mass loading ratio, and the particle size and turbulence intensity at the shaft inlet. Predictions compared well with the limited experimental data in the literature. Increasing the angle at which the flow enters the shaft from the burner was found to increase agglomeration up to a critical angle at which the flow behaviour changes. The results have implications for the control and reduction of dust levels in the waste gas stream.     

美国所拆的都是功能已丧失的小型坝

50年前人们不考虑修建大坝带来的生态影响,但随着建坝后出现的一些问题,人们开始考虑并重视生态环境问题.据我所知,目前美国有上千座小坝被拆除,所拆的坝大多数为小型坝,寿命超过使用年限、功能已丧失或本身就是病险坝,且维修费用高昂,拆除是最经济的选择.所拆除的这些小坝,占美国大坝很小的一部分.     

Surgical treatment of the massively dilated ureter in children. Part II. Management by primary reconstruction

Bypass of the left ventricle was accomplished in dogs and the entire circulation was supported temporarily by only the right ventricle. The atrial septum was excised, and the atrium was repartitioned so that the pulmonary veins were in continuity with the right ventricle and the venae cavae were connected through the atrium. Anastomosis of the superior vena cava to the right pulmonary artery brought systemic venous return directly to the lungs. The main pulmonary artery was ligated proximal to the bifurcation, preserving distal confluence of right and left pulmonary arteries. A tubular prosthesis between the proximal pulmonary artery and the aorta connected the right ventricle to the systemic circuit. This procedure, or some modification of the principle, may have clinical feasibility in the treatment of patients with hypoplastic left heart syndrome.