基于BIM的曲面大板块倒倾T形钢玻璃幕墙施工技术应用

建筑整体呈“芙蓉花”造型,曲面大板块倒倾T形钢玻璃幕墙系统是本幕墙工程主要系统之一。项目针对此幕墙系统采用BIM技术整体参数化建模、快速下单以及全过程指导施工;同时采用“高空车+起重机+手动葫芦”措施施工,并应用全站仪定位复测,确保曲面大板块倒倾玻璃精确安装。此技术方法施工效率高、安装精准、安全可控,为曲面大板块倒倾T形钢玻璃幕墙系统施工提供了一种高效、推广性好的数字化施工方法。

倒挂悬垂与“倒倾综合症”附1例报告

本文报告了１例因倒挂悬垂所致新的运动性疾病，主要表现为：嗳气、恶心、呕吐等倒倾症状；还有出汗、乏力、头晕、食欲不佳，咽下困难等综合症状。暂命名为“倒倾综合症”。分析探讨了发病机制，临床特点，总结了治疗经验，并提出了诊断标准和预防措施。

倒倾式无冲击止回阀阀体密封副的加工

介绍了倒倾式无冲击止回阀阀体结构特点,论述了阀体与阀瓣轴孔的合镗加工方法。

用“倾而不倒”的演习工程探讨建筑物爆破倒塌的参数

因消防演练工程的需要,要求将一幢4层框架楼房爆破成“倾而不倒”以供演练,通过本工程的特殊情况,比照爆破设计与实际爆破后相关数据,探讨建筑物爆破倒塌的切口参数,对拆除爆破工程的现实参照有较好的借鉴意义。同时,还对“电子对射探头紧急自动起爆装置”作了简要的介绍。

小龙钨矿使用前倾式振动清车倒矿机取得成效

小龙钨矿自己设计制造的前倾式振动清车倒矿机,经过近三年的使用和不断改进,取得了较好的效益。该机主要由倒矿机架和振动器二大部分组成。倒矿机架由矿山传统使用的前倾式倒矿机改造而成;振动器为钢板和型钢铆焊并经热处理的四面框架结构。其振动频率为23Hz,频率比为4.2,振幅为1.4mm,最大激振力为2×888N。该机将清车工序和倒矿工序合为一体,

Deep-seated large-scale toppling failure in metamorphic rocks：a case study of the Erguxi slope in southwest China

Deep-seated large-scale toppling failure presents unique challenges in the study of natural slope deformation process in mountainous regions.An active deep-seated toppling process was identified in the Erguxi slope located in southwest China,which affected a large area and damaged critical transportation infrastructure with the volume of the deforming rock mass exceeding 24×10~6 m^3.It poses significant risks to the downstream Shiziping Hydropower Station by damming the Zagunao River.Field investigation and monitoring results indicate that the deformation of the Erguxi slope is in the advanced stage of deep-seated toppling process,with the formation of a disturbed belt but no identifiable master failure surface.It was postulated that the alternating tensile and shear strength associated with the hard/soft laminated rock strata of metasandstone and phyllite layers preclude the development of either a tensile or shear failure surface,which resulted in the continuous deformation and displacement without a catastrophic mass movement.The slope movement is in close association with the unfavorable geological conditions of the study area in addition to the construction of transportation infrastructure and the increase of the reservoir level.On the basis of the mechanism and intensity of the ongoing toppling deformation,a qualitative grading system was proposed to describe the toppling process and toevaluate the slope stability.This paper summarized the field observation and monitoring data on the toppling deformation for better characterizing its effect on the stability of the Erguxi slope.The qualitative grading system intends to provide a basis for quantitative study of large-scale deep-seated toppling process in metamorphic rocks.

Impulse force reductions and their effects on WBV exposures in high impact shovel loading operations

When shovels load the dump trucks with over 100-ton passes under gravity dumping conditions, they will create a large impact force on the dump truck body which generates high frequency shock waves which expose the operators to whole body vibrations （WBV）. The main cause of such truck vibrations is the large impact force due to the gravity dumping of large tonnage passes. Therefore a rigorous mathematical model has been developed for the impact force containing all the necessary factors upon which it depends. Latter, a thorough analysis shows that percentage reduction of 7.19%, 9.40%, 13.27%, 14.8%, 17.30% and 18.13% can he achieved by reducing the dumping distance to 6.33 m, 6.0 m, 5.5 m, 5.33 m, 5.0 m and 4.9 m, respectively, as compared to when the dumping distance was 7.33 m. Even more reduction in the magnitude of impact force can he observed if the shovel pass gets divided into more than two sub-passes. Therefore, these models can he used to figure out the number of sub-passes into which a single ore pass can he divided and/or the extent to which the dumping distance can he reduced which would reduce the impact force significantly enough to obtain safer yet economic operations.

Land reclamation in the refuse dump of open coal mines and its following ecology principle

Through the research on the model of the land reclamation in the refuse dumpof Heidaigou open coal mines,it was concerned that ecology was the theoretical basic forthe land reclamation of open coal mines.According to the principle of ecological substitut-ing,the land reclamation can be divided into three stages:water and soil conservation,ecological performance and economic performance.Taking the land reclamation in the re-fuse dump of Heidaigou open coal mines as the practical example,explained the applica-tion of the ecological substituting principle on the land reclamation in the open coal mines.

Universality Class in Abelian Sandpile Models with Stochastic Toppling Rules

We present a stochastic critical slope sandpile model, where the amount of grains that fall in an overturning event is stochastic variable. The model is local, conservative, and Abelian. We apply the moment analysis to evaluate critical exponents and finite size scaling method to consistently test the obtained results. Numerical results show that this model, Oslo model, and one-dimensional Abelian Manna model have the same critical behavior although the three models have different stochastic toppling rules, which provides evidences suggesting that Abelian sandpile models with different stochastic toppling rules are in the same universality class.

Inverses and Powers of Matrices over an Incline

Invertible conditions,indices and periods of matrices over an incline are considered.In all proofs multiplicative commutativity is not used.Some results about invertibility, indices and periods in a commutative incline are proved to be correct also for any incline.

Application of waste mushroom on land reclamation in the refuse dump of Haizhou Open-pit Mines

In order to rapidly increase the degree of maturation of the soil in land reclamation of the refuse dump of the Haizhou open-pit mines, the application of waste mushroomin the process of soil improvement in the dump was studied. Through the research onplant growth, root development and microbial changes in soil and change of physical andchemical characteristics of the plot, the result shows that waste mushroom can increasethe degree of maturation of the soil and improve soil fertility.

Safety Research on Filling Collapse by Dumping Rocks along the Collapse

Because the large collapse pits appeared in the surface of stoped-out area in the lower iron belt of the southeast of Gongchangling iron mine, the sliding danger of side wall of collapse pit threats seriously the production safety of open-pit of upper iron belt. The harm forms of collapse pit, especially the subsided harm of the bottom of granular media are analyzed. The experiment shows the possibility of the granular media forming the arch in the course of mining and analyzes the continuity of bulk movement. Then it can be concluded that the granular media of pit bottom will not suddenly subside in the process of downward shift. Therefore, a technical scheme of drawing the open-pit stripping rock along the collapse pit was proposed and the rock can be dumped along the collapse pit trend and wall safely.

Lixiviation of Open-Coast Dumping Site and Pollution of Water and Soils of Edea Industrial Zone（Littoral-Cameroon）

The nexus between water, food and energy is one of the most fundamental relationships and challenges for society. Indeed, seepage of wastes stored into dumping sites of Edea township, favor their lixiviation. Soluble components of matter are slowly dissolves, drained by meteoric water and flowed into tail bay vicinity. Knowledge of trace and toxic metal concentrations in the biotic matrices is important for assessing the effects of pollutants and the risk of exposure. In this study, A1, Mn, Cd, Cr, Cu, Pb and Zn were quantified respectively in 33 samples of soil and water, using ICP-MS （Inductively Coupled Plasma Mass Spectrometry）, Pb were found between 1.38-88.28 mg/L. Higher concentrations of Al were found in Alucam industrial wastes （315,502.33 mg/kg）, and in Hysacam domestic wastes （54,126.93 mg/kg）. Concentrations of Cd （1.955 mg/kg）, Pb （469.00 mg/kg） and Zn （853.00 rng/kg） are higher in domestic wastes. The ones of Mn （696.96 mg/kg） and Cu （1,320.10 mg/kg） are higher in industrial wastes. Higher concentrations of Pb and Cu let assume that it is a risk of poisoning relative to these elements around this area. These findings illustrate that lixiviation of dumping wastes has great influence on water and soils pollutions of the study ecosystem.

Solid Waste Dumping Site Selection Using GIS and Remote Sensing for Kajiado County, Kenya

Solid waste dumping is a hectic problem in urban and developing areas due to shortage of land for the purpose. The main objective of this study was to select potential areas for suitable solid waste dumping for Kajiado County, Kenya. Eight input map layers including DEM （digital elevation model）, topography, urban settlement, roads, wetlands, rivers, forests and protected areas were prepared and MCDA （Multi Criteria Decision Analysis Methods） were implemented in a GIS （geographic information systems） environment. GIS, RS （remote sensing） and MDCA are powerful tools which can effectively be applied during the planning phase of solid waste management in order to avoid adverse catastrophes in future. The final suitability map was prepared by weighted overlay analyses and leveled as the most suitable, moderate suitable, less suitable and unsuitable areas. The area of each suitability level was calculated using spatial statistics. Polygons representing the most suitable sites were further analyzed in terms of area perimeter ratio in order to investigate the most suitable areas in terms of shape regularity. The leading four polygons considered were marked A, B, C, D respectively in the final map. This study showed that suitable areas for solid waste landfills were limited and scattered in the study area.

Comparisons between centrifuge and numerical modeling results for slope toppling failure

This paper presents series studies on the toppling mechanism by centrifuge tests and numerical simulations. Two different discrete element methods, i.e., the continuum-based discrete element method(CDEM) and the discontinuous deformation analysis(DDA), are adopted. The modeling results show that both the methods can accurately capture the failure modes of the centrifuge tests, including three distinct zones and two failure surfaces. Comparisons are made between the physical test and numerical simulation results. The critical inclination angle of the tilting table where the slope models are fixed on can be moderately predicted by the two methods, with different degrees of precision. The error between the test results and the simulated results is within 1% for the slope models without rock-bridges by both CDEM and DDA. However, it is amplified for the staggered-joint models that simulate the rock-bridges. With DDA, the average error is about 5%, and the maximum error is up to 17%. While with CDEM, the errors for the aligned-joint models are ranged from 1% to 6%, and it is from 10% to 29% for the staggered-joint models. The two numerical methods show the capability in simulating toppling failure of blocky rock mass with and without rock-bridges. The model with rock-bridges which provides a certain bending resistance is more stable than the one without any rock-bridge. In addition, the two failure surfaces were observed, which is different from the common understanding that only one failure surface appears.

蒲松龄笔下的赌徒

读《聊斋志异·赌符》篇,很佩服蒲留仙的妙笔传神。你看这一段四六骈文: 尔乃狎比淫朋,缠绵永夜。倾囊倒箧,悬金于险巇之天;呵雉呼卢,乞灵于淫昏之骨。盘旋五木,似走圆珠;手握多张,如擎团扇。左觑人而右顾己,望穿鬼子之睛;阳示弱而阴用强,费尽魍魉之技。门前宾客待,犹恋恋于场头;舍上火烟生,尚耽耽于盆里。忘餐废寝,则久入成迷;舌敝唇焦,则相看似鬼。迨夫全军尽没,热眼空窥,视局中则叫号浓焉,技痒英雄之臆;顾橐底而贯索空矣,灰寒壮士之心。