某围堤对其上跨桥梁跨径的影响分析

某大型桥梁需要跨越后建的围堤.桥墩支承在大直径桩基础之上,围堤直接建于软土地基上.按通常采用的边吹填边挤淤的施工工艺,施工过程中势必产生较大的地基变形而影响邻近的桥梁桩基础,而设计与使用要求对桥墩的变形控制要求较高.通过数值计算,模拟了围堤对桥梁桩基础的影响,据此为确定桥梁跨径提供依据.计算过程中,考虑了围堤挤淤沉降,导致填料荷载增加、围堤外侧地基隆起等不利情况,并就其影响范围及程度作了讨论分析,建议采用对围堤进行地基加固的方法进行施工.     

颠覆——科勒Purist Hatbox无水箱座便器

在人们的惯性思维里，座便器总是背着一个大大的水箱。在长达100多年的历史中，水箱分化出连体、分体、隐藏和挂墙等样式，无论形式如何多样，它都是座便器的重要组成部分。 然而，来自科勒卫浴的飘瑞诗座便器（Purist Hatbox Toilet）却彻底颠覆了这一传统观念。它首创了无水箱设计，凭借这一独特的创新设计，在2005年它获得了著名的全美工业设计（IDSA）金奖。[编者按]     

Controlling the Flashpoint of a Flammable Solvent with a Refrigerant

Fire Technology - The transportation industry demands the flammability control in the safe transportation of any liquid mixtures. Here the flashpoint of a flammable solvent is controlled by adding...     

The effect of a sprinkler on the stability of a smoke layer beneath a ceiling

A study has been made of the effect of sprinkler sprays on hot buoyant smoke layers with particular reference to covered shopping malls.     

Methods for the evaluation of a hinge pin in a clapper support of a check valve

Typical methods for the evaluation of a hinge pin used in a clapper support of a check valve are presented. For clarity, an example is provided to show the application of the equations.     

一座传统村落的前世今生——新技术、保护概念与乐清南阁村保护规划的关联性

本文简要回顾了南阁村保护规划过程中所思考的一些具有普遍意义的问题,以及由于应用数字技术而出现的对传统空间认知与分析方法方面所作的一些改进。传统文化遗产的保护与传承是一件十分复杂的工作。保护不是简单地守成,而是在一个已经发生巨变了的社会经济环境中对中断的历史进行重新疏理,并将其融入新的社会环境中。     

Study on the outcome of a cetane improver on the emission characteristics of a diesel engine

ABSTRACT

Dimethyl carbonate (DMC), a cetane improver, is used as a fuel additive to investigate the exhaust emission in diesel engine. Neem oil biodiesel (B100), neem oil biodiesel + dimethyl carbonate (B100+DMC) and diesel were used as test fuels. DMC is added 0.5% by volume to biodiesel. This research work was executed in a four-stroke, single-cylinder diesel engine. Owing to the percentage of DMC in biodiesel, carbon monoxide (CO) and hydrocarbon (HC) emissions were dropped corresponding to diesel. A considerable amount of nitrogen oxide (NO_x) is decreased when diesel is used, and by the addition of B100+DMC, NO_x were slightly reduced compared to B100.     

地铁车站地下连续墙槽壁稳定性分析

基于对影响槽壁稳定主要因素的分析及对槽壁稳定常规计算方法的探讨,结合南京地铁某车站的工程实际,对连续墙成槽的槽壁稳定性进行计算,并与工程实际实施情况进行对比分析。     

Effect of a damper on the wind-induced oscillations of a tall mast

A study of wind-induced oscillations in the downwind direction has been performed for a tall slender mast that incorporates a unique form of damper. The damper consists of a hinged extension to the main mast, rotation of the extension being opposed by springs that provide stiffness, and by viscous dampers. In that portion of the domain of hinge parameters (stiffness and damping) where conventional (approximate) analysis shows substantial beneficial effects of the damper, a more exact analysis shows that the benefit is not in fact realized. The “exact” analysis is so termed because it treats the natural modes of the linear vibration problem exactly, in contradistinction to conventional vibration analysis, which approximates complex modes by real modes. The frequently made approximation of neglecting the interaction between orthogonal modes in the conventional analysis is shown to lead to substantial error in this case. The cross-vibrations associated with vortex shedding are briefly discussed.     

论专业更名

根据历届新生入学的专业教育教学研究实践,以详实的专业报考志愿数据,阐述了原供热、通风与空气调节工程,城市燃气工程,供热空调与燃气工程3个专业重组更名为"建筑环境与设备工程"专业后被社会了解、认知情况以及所产生的弊端。通过分析,提出将"建筑环境与设备工程"更名为"建筑环境与能源应用"专业,该更名不仅具有必要性、贴切性、前瞻性、高屋建瓴的大器性,而且还能从生源抓起应对能源和环境的挑战,能更好地培养注册设备工程师。     

Experimental confirmation of a criteriong for the bearing capacity of a bed

Conclusions 1. Experiments with full-scale foundations confirm that even after the start of ground bulging, foundation settlements may even continue to stabilize, the average settlements cease to be allowable, and the s-p curve is even simplified, approaching a linear curve, when the pressure beneath the foundation is increased. At the start of bulging, however, settlement nonuniformities of the foundations increase sharply and even become inadmissible.2. The limiting pressures initiating ground bulge correspond to that section of the s-p curve, where its initial segment converts into an inclined section that is close to a straight line. Up to pressures equal to half the limiting pressures and for shallow rigid foundations on sands of average density and dense sands, the s-p curve is close to linear, and the foundation settlements can be calculated in conformity with the recommendations of the Construction Rules and Regulations.3. For foundations on loose sands, the compaction of sand during shear, which may lead to inadmissible settlement nonuniformities even at minimal pressures due to the foundations, are the most dangerous settlements. The possibility of these nonuniformities should either be eliminated by compaction prior to construction, accounted for during design, In predicting settlement nonuniformity, we should proceed from data on plate tests of loose sands with consideration of the recommendations in [5, 6].VNIIOSP. Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 2, pp. 23–26, March–April, 1988.     

Optimisation of the evaporator of a refrigerator employing hydrocarbon as a refrigerant

ABSTRACT

The refrigeration and air conditioning system is a booming research in the research area. In refrigeration, the scientists focus on the new refrigerant in order to reduce the global warming potential (GWP), high coefficient of performance (COP) and meet zero ozone depletion potential (ODP). Not only the new refrigerant as a solution to attain zero ODP, high COP and at the same time to optimise the design of refrigeration system to meet ODP and COP as a required level. This paper aims to optimise the design of a double refrigerator evaporator for a refrigerator employing non ozone-depleting hydrocarbon refrigerant using brine as a secondary solution with a low GWP. It is done by numerical modelling followed by the parametric modelling using CATIA V5.