四重式辊式矫直机初探

四重式辊式矫直机是鞍钢厚板厂从日本住友公司和歌山厚板厂引进的设备。阐述了四重式辊式矫直机矫直原理、矫直机结构、矫直机的矫直工艺及矫直过程，对矫直机能力进行了分析探讨。     

卸荷式与悬臂式挡土墙受力分析及比较

通过对悬臂式钢筋混凝土挡土墙年卸荷式钢筋混凝土挡土墙受力分析比较，可以看出，同样高度的卸荷式挡墙较悬臂式挡墙在挡墙墙壁根部所受变和左要小。     

采用旋切式顶燃热风炉技术改造球式热风炉探析

针对高炉球式热风炉存在的燃烧效率低、蓄热体寿命短、炉箅子易断裂等问题,提出了采用旋切式顶燃热风炉技术对球式热风炉进行改造的方案。旋切式顶燃热风炉具有送风温度高、格子砖阻损小、两代高炉炉龄内不需要更换等优点。认为采用旋切式顶燃热风炉技术对球式热风炉进行改造有明显的优势,据测算,可以提高送风温度200℃左右,降低焦比40~50 kg/t。     

第二代顶燃式热风炉

1.前言 顶燃式热风炉是一种新的炉型结构,其结构及热工性能较内燃式(考柏式)或外燃式热风炉优越。六十年代受到各国冶金工作者的     

韶钢烧结厂可逆式锤式破碎机改造及效果

简要介绍了韶钢烧结厂对 Φ1 0 0 0 mm× 1 0 0 0 mm单转子可逆式锤式破碎机进行改造的原因及过程 ,并对改造后的 WSK1 2 2 5× 94 0可逆式锤式破碎机的结构特点、改造后的使用效果以及改造产生的经济效益进行了分析     

悬臂式机架

为什么要使用悬臂式机架?因为在某些情况下,这些机架提供了显著的优点;包括单线连续式轧机在内的小钢厂的概念越普及,则作为一种有效解决办法的悬臂式机架(常称作悬臂式整体机架)就越流行。悬臂式整体机架的结构特点在技术和经济方面都是对八十年代企业家提出的关于新型小轧机或现有轧机改造的要求的最好回答。     

新型上引式气力输送仓式泵

配合武汉钢铁公司 4号高炉的技术改造工程 ,钢铁研究总院与其合作研制了新型大容积上引式气力输送仓式泵。新型仓式泵系统采用了如下新研制的设备或部件 :1在煤粉仓底部安装由 10个点式流化器构成的流化漏斗 ,可以通过点式流化器向粉仓少量充气 ,使煤层松动 ,促使煤层下落 ,提高仓式泵的受粉速度 ;2在仓式泵底部安装采用微孔不锈钢丝烧结板制作的大面积焊接流化床。该流化床直径为 10 5 0 m m,流化板厚度为 3mm ,并采用了中心定位和边缘密封的方式。这种流化床的结构牢固、密封性好 ,能够改善气体的流化效果 ,并且可以在高含水压缩空气中长…     

首钢顶燃式热风炉

首钢顶燃式热风炉(见照片)科研成果已应用于1327m~3高炉。与外燃式、内燃式热风炉相比有下述优点:     

新型上引式气力输送仓式泵

配合武汉钢铁公司4号高炉的技术改造工程,钢铁研究总院与其合作研制了新型大容积上引式气力输送仓式泵。新型仓式泵系统采用了如下新研制的设备或部件:在煤粉仓底部安装由10个点式流化器构成的流化漏斗,可以通过点式流化器向粉仓少量充气,使煤层松动,促使煤层下落,提高仓?..     

断开式联轴节

FlexRite Chemgiene厂推出了一种新的Salamander联轴节。这种卫生的断开式联轴节的设计是为了避免在罐车离开而软管仍然保持连接时对设备和人员造成伤害。对于使用在无危险产品的食品工业和酿酒业，Salamander卫生的断开式联轴节将经过可靠试验的三爪式夹头垫圈的卫生密封能力与316L不锈钢普遍认可的材料性能结合在一起。     

Concept-Based Method for Extracting Valid Subsets from an EXPRESS Schema

An EXPRESS schema is a data schema defined in EXPRESS, an international standard language for defining product data schemas. This technical paper proposes and formally defines a set of conditions for generating a minimum valid subset of an EXPRESS schema corresponding to a concept, where a concept is a general idea and a subset is a partial model of a data schema. We introduce a notion of “minimal set” to define the relationships between a subset and other subsets, and also between a subset and concepts. A minimal set is the smallest complete subset of a schema that corresponds to a concept. Using IFC, an international standard data model for the architecture, engineering, and construction industry, the proposed conditions have been implemented in a software application developed for extracting subsets from the IFC schema matching the concepts. A number of examples are demonstrated.     

The Principles of Conventionality and Contrast in Word Learning: An Empirical Examination.

In Study 1, 4-year-olds avoided 2 names for an object when exposed to a common or a proper noun in a puppet's presence or to a common noun in a puppet's absence, but not when exposed to a proper noun in a puppet's absence. In Study 2, 3-year-olds avoided 2 names for an object when the requester for the referent of a second label in a different language was bilingual and present during naming, but not when the speaker was bilingual but absent or monolingual. Study 3 followed up on the results of the first 2 studies. When children could assume that the puppet knew the name the experimenter used, they inferred that the puppet's use of a different name implied a different referential intent. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Postprocessing the Hybrid Method for Addressing Uncertainty in Risk Assessments

In a previous paper in this Journal, a “hybrid method” was proposed for the joint propagation of probability distributions (expressing variability) and possibility distributions (i.e., fuzzy numbers, expressing imprecision or partial ignorance) in the computation of risk. In order to compare the results of the hybrid computation (a random fuzzy set) to a tolerance threshold (a tolerable level of risk), a postprocessing method was proposed. Recent work has highlighted a shortcoming of this postprocessing step which yields overly conservative results. A postprocessing method based on Shafer’s theory of evidence provides a rigorous answer to the problem of comparing a random fuzzy set with a threshold. The principles behind the new postprocessing scheme are presented and illustrated with a synthetic example.     

When danger lurks in the background: Attentional capture by animal fear-relevant distractors is specific and selectively enhanced by animal fear.

Across 2 experiments, a new experimental procedure was used to investigate attentional capture by animal fear-relevant stimuli. In Experiment 1 (N = 34), unselected participants were slower to detect a neutral target animal in the presence of a spider than a cockroach distractor and in the presence of a snake than a large lizard distractor. This result confirms that phylogenetically fear-relevant animals capture attention specifically and to a larger extent than do non-fear-relevant animals. In Experiment 2 (N = 86), detection of a neutral target animal was slowed more in the presence of a feared fear-relevant distractor (e.g., a snake for snake-fearful participants) than in presence of a not-feared fear-relevant distractor (e.g., a spider for snake-fearful participants). These results indicate preferential attentional capture that is specific to phylogenetically fear-relevant stimuli and is selectively enhanced in individuals who fear these animals. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Context- but not familiarity-dependent forms of object recognition are impaired following excitotoxic hippocampal lesions in rats.

Dual-process models of recognition memory in animals propose that recognition memory is supported by two independent processes that reflect the operation of distinct brain structures: a familiarity process that operates independently of the hippocampus and a context-dependent (episodic) memory process that is dependent on the hippocampus. A novel variant of an object recognition procedure was used to examine this proposal. Healthy rats showed a preference for exploring a novel object rather than a familiar object: a familiarity-dependent recognition effect. They also showed a preference for exploring a familiar object that was presented in a different spatiotemporal context rather than a familiar object that was presented either in a different spatial or temporal context: a context-dependent form of recognition that is sensitive to "what" object has been presented "where" and "when." Rats with excitotoxic hippocampal lesions showed the familiarity-dependent but not the context-dependent form of recognition. The results provide support for dual-process theories of recognition memory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Hedratecture and Expandable Platform

This paper is directed only to the basic aspects of hedratecture. The word hedratecture is derived from the Greek “to build with hedrons.” It is used to describe the art and science of constructing with framed elements that are hedron‐shaped, usually in the form of the five convex polyhedrons. Hedratecture encompasses two major elements: the expandable platform and structures thereon. The platform when set on a surface by computer has the capability to incorporate within itself a whole variety of integrated lesser structures that provide dwelling units and a modular internal transportation system. The platform can be placed in a designated area as a hedron city or expanded in a linear dimension and in that mode it becomes a trestle or a bridge. The basic elements provide an endless variety of shapes with uses that vary from a small helicopter pad to a small city on earth. When placed on the Moon or Mars it can provide a telerobotically placed base.     

The Motivating Impact of Informing Women Smokers of a Link Between Smoking and Cervical Cancer: The Role of Coherence.

This research assessed the role of having a coherent explanation of the link between smoking and cervical cancer in motivating women to stop smoking. In the 1st study, women were given a leaflet with either a detailed or a minimal explanation of the link or no leaflet. The leaflets were similarly effective at providing a coherent explanation. In a cross-sectional analysis, having a coherent explanation moderated the relationship between perceived vulnerability and intention: Higher perceived vulnerability to cervical cancer was associated with greater intention to quit smoking only amongst women with a more coherent explanation of the link between smoking and cervical cancer. This rinding was replicated in a 2nd study. These results are consistent with H. Leventhal et al.'s (1997) self-regulatory model, which suggests that motivation to change behavior depends not only on perceiving a threat but also on having a coherent model linking the behavior with the threat. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Membrane Micro Air Vehicles with Adaptive Aerodynamic Twist: Numerical Modeling

Micro air vehicles are typically characterized by a low aspect ratio wing operating at low Reynolds numbers (104): aerodynamics involve a three-dimensional flow field with numerous regions of separated flow. Furthermore, aerodynamic twist can be built into the wing through the use of a thin membrane skin, to adaptively increase the wing camber. This work formulates a static aeroelastic model of such a wing, by coupling a linear membrane model to a well-validated steady laminar Navier–Stokes solver. The membrane deformation causes a significant pressure redistribution which increases lift and longitudinal static stability, though a drag penalty also develops. The efficiency of a rigid wing increases with Reynolds number, but decreases for a membrane wing, as the deformation generally provides a nonoptimal airfoil shape. Membrane deformation leads to larger separation bubbles, and acts as a barrier to the tip vortex formation. At high angles of attack, the aerodynamic twist causes a direct interaction between the recirculating flow and the tip vortices, indicating potential roll instabilities.     

Analytical Solutions for Constant-Flux and Constant-Head Tests at a Finite-Diameter Well in a Wedge-Shaped Aquifer

Neglecting the effect of well radius may lead to a significant error in the predicted drawdown distribution near the pumping well area. New analytical solutions describing aquifer responses to a constant pumping or a constant head maintained at a finite-diameter well in a wedge-shaped aquifer are derived based on the image-well method and applicable to an arbitrarily located well in the system. The solutions are useful for quantifying groundwater exploitation from a wedge-shaped aquifer and for determining the hydrogeological parameters of a wedge-shaped aquifer in inverse problems.