热膨胀对塔器联合平台的影响

从理论和工程实例两方面分析了热膨胀对塔器联合平台中的直梯、斜梯和过道的影响，并提出了较为合理的设计方案。     

Preparation of chitosan-based flocculant for high density waste drilling mud solid–liquid separation

High performance flocculant was prepared by chitosan (CS), ethacryloyloxyethyl trimethyl ammonium chloride (DMC), and acrylamide (AM). The optimum preparation conditions were determined by orthogonal test of four factors and three levels. The different factors affecting the flocculating ability of the prepared flocculants for waste drilling mud were studied, and optimal synthesis conditions were established: polymerization temperature was 60, reaction time was 4 h, DMC was 3 mL, w(AM) : w(CS) was 4, and the initiator was 0.4% of AM (wt %). The prepared CS–AM–DMC copolymer was characterized by Fourier Transform Infrared Spectroscopy (FTIR), scanning electron microscopy (SEM), and gel permeation chromatography (GPC). The results showed that AM, DMC were grafted to CS successfully. The solid–liquid separation properties were also investigated, and the prepared flocculant showed great advantages than commercial products for high density waste drilling mud use. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

四川盆地震旦系灯影组丘滩体发育分布及对储层的控制

四川盆地震旦系灯影组储层主要发育于微生物丘滩体中，但不同成因类型丘滩体对储层的影响尚不明确。通过钻井岩心和野外露头观测、岩石薄片分析和物性测试等手段，将丘滩体划分为丘基、丘核、丘翼和丘坪4种微相，并根据微相的组合划分出台缘并进型丘滩体、台缘追补型丘滩体和台内饥饿型丘滩体3种丘滩体类型。台缘并进型丘滩体的生长速率快，与可容空间的增加速率相同步，其微相组合以"丘基+丘核"垂向加积为主，在海平面升降过程中易暴露于大气淡水环境，造成海水胶结作用弱、淡水溶蚀作用强，形成以格架溶蚀孔洞为主的储集空间，储层物性好，储集性能最优。台缘追补型丘滩体的生长速率次之，其早期的生长速率滞后于可容空间增长速率但后期逐渐同步，呈现出"丘基+丘核+丘翼/丘坪"侧向加积的微相组合；由于暴露于大气淡水环境的几率减小，其海水胶结作用强，淡水溶蚀作用减弱，储集性能稍差。台内饥饿型丘滩体的生长速率最慢，严重滞后于可容空间的增长速率，呈"云坪（丘基）+丘核+丘坪"微相组合，难以暴露于大气淡水环境，淡水溶蚀作用最弱，储集性能也最差。台缘带古地貌对丘滩体的生长速率影响较大，可控制丘滩体的沉积样式。陡坡台缘带有利于台缘并进型丘滩体发育，缓坡台缘带主要发育台缘追补型丘滩体，台内高地中发育台内饥饿型丘滩体。胡家坝-阆中-安岳地区一带的震旦系灯影组四段发育于典型的陡坡台缘带，是储层发育的最有利相带。     

Optimal buffer inventory and preventive maintenance for an imperfect production process

In this paper we present a model to determine the optimal length of continuous production periods between maintenance actions and the optimal buffer inventory to satisfy demand during preventive maintenance or repair of a manufacturing facility. We include in the model the possibility of imperfect production. We consider that the duration and cost of the maintenance action depend on the state of the production facility.     

新型模块插装式电源控制器结构设计

针对卫星电源控制器在深空探测卫星平台应用的特点,电源控制器对质量体积提出了新的要求,结合国内电源控制技术的研究现状提出了新的电源控制器轻量化技术。在保证产品可靠性的条件下,为了进一步降低产品质量、减小产品体积同时优化生产工艺,对电源控制器内部的各项设计进行优化,提高电源控制器的功率质量比。通过新型模块插装式电源控制器结构设计,实现了对其结构的优化设计,以达到提升电源控制器功率质量比的目的。     

An experimental and numerical study on laser percussion drilling of thick-section alumina

A major challenge in laser percussion drilling of thick-section ceramics is to obtain a low taper and low spatter deposition hole leading to high quality post-processing. In order to achieve the fine hole drilling, it is important to understand the mechanism of laser percussion drilling. In this paper, an experimental and numerical study on laser percussion drilling was carried out. A two-dimension (2D) axisymmetric finite element (FE) model for simulation of temperature field and proceeding of hole formation during percussion drilling was developed. The FE model was validated by the corresponding experiment. Furthermore, a theoretical model for evaluation of temperature at melt front and velocity of melt ejection was presented in order to further validate the FE model and study the spatter deposition. The effects of laser peak power, pulse duty cycle and pulse repetition rate on hole diameter and spatter deposition were investigated by the developed models and experiments, in which the simulated results were in good agreement with the experiments. The study indicated that the size and temperature of the melt front significantly affected the hole diameter formation and spatter deposition during laser percussion drilling. The characteristic of melt front was mainly determined by the employed laser peak power, pulse repetition rate and pulse duty cycle. Based on the experimental and numerical study, the process parameters were optimised and a drilled-hole with low taper and low spatter deposition was obtained using a 3.5 kW CO₂ laser. A microstructural and element compositional study was also performed in this work, by which the characteristics of microstructure and element composition in HAZ around laser drilled hole were revealed.     

顶板走向高位钻孔解决上隅角瓦斯超限技术研究

上隅角是煤矿采煤工作面采空区的漏风汇集处,其瓦斯超限问题是矿井瓦斯治理中常见的问题。魏家地煤矿针对上隅角瓦斯超限问题,采取合理的顶板高位钻孔设计方法代替高抽巷,通过采取这一技术抽采裂隙带瓦斯,有效地解决采煤工作面上隅角问题,取得了很好的抽放效果。     

PLC在两工位钻孔攻丝组合机床改造中的应用

运用西门子S7-200系列PLC技术,对其传统设备进行技术改造。设计了PLC的I/O分配和外部接线图,编写了PLC的功能流程图和程序梯形图,运行结果与实际生产要求一致。对于提高两工位钻孔、攻丝组合机床工作效率,减少传统设备维修工作量,值得技术借鉴和推广应用。     

基于SaaS和SOA的模具行业科技公共服务平台研究

面向模具行业信息化,提出了基于SaaS和SOA的模具行业科技公共服务平台,构建了该平台的原型系统。对平台涉及的关键技术进行了分析,结合SaaS模式和SOA思想,提出了模具行业科技公共服务平台的实现方案。     

硬质基岩层钻孔灌注桩成孔新技术及应用分析

介绍了硬质基岩层回旋钻进成孔的新技术,阐述了该技术的工艺原理、施工流程、技术要点及难点、质量控制和应用实例等,指出该技术适用于各种复杂地质条件,具有重要的工程应用价值和推广意义。