不同井型下的天然气水合物降压开采产气产水规律

目前的研究成果表明，降压法及其改良方案可能是实现海域天然气水合物（以下简称水合物）高效开采的最佳途径，但现有降压条件下的产气能力距离水合物商业开发需求仍存在着不小的差距，因而提高水合物藏分解效率、提升储层气液运移产出能力，进而形成安全高效的水合物开采新方法，是水合物开发过程中急需解决的瓶颈问题。为此，利用自制的水合物复杂结构井模拟实验装置，分别开展了垂直井、水平二分支井（夹角90°）开采水合物的实验室模拟实验，据此分析不同开采条件下各井型的产气、产水规律。研究结果表明：①垂直井与分支井开采中，降压幅度是控制前期产气速率的主要因素，而后期环境温度对水合物分解量的影响则逐渐加强；②井型对水合物开采产能具有明显的控制作用——垂直井开采降压幅度越大，产气情况越好，但实验尺度下累计产水量则相差不大，水平二分支井（夹角90°）开采过程中，产气速率比射孔面积相同的垂直井更高，波动较小，但初始阶段产水明显；③降压—热激联合作用更有利于水合物的分解和稳定产气，在其联合作用下，水平二分支井（夹角90°）比垂直井更有利于水合物的长期稳产。     

Microstructure of Laser Processed T10 Carbon Tool Steel

The microstructure of the laser melted 1.0%C tool steel have been investigated.The region affectedby the laser can be subdivided into 3 zones,which consist of a melted region at the surface,a zonewith solid state transformation and the area adjacent to the unaffected substrate where cementite isslightly dissolved.The melted zone possessed a cellular growth morphology consisting of austeniteand martensite.The carbon content of the austenite was measured to be over 1 wt-%.A great deal ofretained austenite and twinned martensite were found in the first two zones(the melted and solidtransformed).     

利用固态法白酒微生物群制备液态发酵剂研究

以宜宾叙府酒业五粮为原料,取其窖泥、大曲混合经液态法培养与扩大后作为发酵剂,采用前期液态法通风发酵工艺制成发酵醪。分别对发酵剂制备工艺的5个参数进行了探讨,用正交试验进行优化。结果表明,当培养与扩大工艺条件窖泥∶大曲为2∶3(w/w)、培养时间3.5d、摇床转速130r/min、培养温度28℃、转接接种量9%(v/v)时,发酵剂可见总菌数达5.89×104个/mL;发酵醪酒精度6.8%vol、总酸1.1794g/100mL、总酯2.6653 g/100mL、总醛0.1633g/100mL、总糖5.1%(w/w),与用窖泥、大曲混合直接作为发酵剂制得的发酵醪对比相差不大。     

浅述电子清纱器检测头电磁铁的设计

在电子清纱器检测头工作原理的基础上,引入了对电磁铁的介绍,并运用拍合式电磁铁工作原理对磁路进行了分析、计算,并得出了电磁铁吸合力的计算方法。明确了电磁铁吸合力的计算、实验是电子清纱器检测头设计的重要基础环节,进而对电子清纱器检测头电磁铁的设计方法给出指导意见。     

混凝土施工中常见几个质量问题

文章对钢筋混凝土的组成材料要求、施工技术、养护管理要求进行分析,从而达到节约资源,减少重复投资,实现工程建设的目标.     

Chemical Mechanical Polishing of Glass Substrate with α-Alumina-g-Polystyrene Sulfonic Acid Composite Abrasive

Abrasive is the one of key influencing factors during chemical mechanical polishing(CMP) process. Currently, α-Alumina (α-Al2O3) particle, as a kind of abrasive, has been widely used in CMP slurries, but their high hardness and poor dispersion stability often lead to more surface defects. After being polished with composite particles, the surface defects of work pieces decrease obviously. So the composite particles as abrasives in slurry have been paid more attention. In order to reduce defect caused by pure α-Al2O3 abrasive, α-alumina-g-polystyrene sulfonic acid (α-Al2O3-g-PSS) composite abrasive was prepared by surface graft polymerization. The composition, structure and morphology of the product were characterized by Fourier transform infrared spectroscopy(FTIR), X-ray photoelectron spectroscopy(XPS), time-of-flight secondary ion mass spectroscopy(TOF-SIMS), and scanning electron microscopy(SEM), respectively. The results show that polystyrene sulfonic acid grafts onto α-Al2O3, and has well dispersibility. Then, the chemical mechanical polishing performances of the composite abrasive on glass substrate were investigated with a SPEEDFAM-16B-4M CMP machine. Atomic force microscopy(AFM) images indicate that the average roughness of the polished glass substrate surface can be decreased from 0.835 nm for pure α-Al2O3 abrasive to 0.583 nm for prepared α-Al2O3-g-PSS core-shell abrasive. The research provides a new and effect way to improve the surface qualities during CMP.     

基于B样条的航空薄壁件加工变形预测与控制

针对开发航空薄壁件多点柔性工装系统的需求,研究了航空薄壁件多点柔性数控加工中的变形预测与控制问题。研究了利用有限元分析和Matlab编程建立B样条加工变形数学模型并进行预测的方法及高速铣削切削参数在线优化控制加工变形的原理和方法。研究结果表明:基于B样条曲面数学模型可对加工变形进行预测,切削参数的在线优化能够有效地控制加工变形。研究结果为有效地解决柔性工装的设计和制造提供了必要依据。     

基于并行工程相关使能技术的协同商务建模研究

协同商务和并行工程是近年来新出现的两种产品开发模式和企业组织方式,二者在现代企业生产管理,尤其是制造业中起着不言而喻的重要作用.文中主要分析了二者相似与相通之处,探索二者结合的可能性和现实性,并演化出在此基础上一个新的制造模式,即基于并行工程使能技术的企业协同商务模型.并最后提出了基于面向协同设计(Design For Cooperation,DFC)的协同商务建模与应用,构建出协同商务技术模型和框架.     

精密磁流变抛光装置的设计与应用

在介绍了磁流变抛光的基本原理基础上,对磁流变抛光的两种不同结构的装置进行了优缺点比较,从影响抛光效率和最终表面精度考虑,确定了最终的装置设计方案,给出了抛光装置的关键部件的设计,并用磁流变抛光加工了直径83mm的BK9光学平面玻璃工件,获得了Ra0.702nm的表面精度.