小浪底3号灌浆洞辐射灌浆孔的成孔技术

辐射灌浆孔是基岩防渗灌浆处理中的一种特殊设计,一般因应特殊部位而设计,技术设计复杂,施工难度大,尤其是其成孔施工难度.小浪底3号灌浆洞辐射灌浆孔是为解决水工建筑物建成后,对可能存在的渗漏通道进行封堵而设计的,其不同角度和深度对成孔技术要求提出了新的课题.     

K0.9Li0.1（Ta0.5Nb0.5）O3晶体压电应变系数的测量

用准静态ｄ＿（３３）测量仪和干涉法相结合。测量了Ｋ＿（０．９）Ｌｉ＿（０．１）（Ｔａ＿（０．５）Ｎｂ＿（０．５）Ｎｂ＿（０．５））Ｏ＿３晶体的压电应变系数。结果为：ｄ＿（３３）＝８６．０，ｄ＿（３３）＝一２９．５，ｄ＿（１５）＝１１２．９×１０￣（－１２）Ｃ／Ｎ．     

Preparation and characterization of polyurethane microcapsules containing n‐octadecane with styrene‐maleic anhydride as a surfactant by interfacial polycondensation

A series of polyurethane microcapsules containing a phase change material (PCM) of n‐octadecane was successfully synthesized by an interfacial polymerization in aqueous styrene‐maleic anhydride (SMA) dispersion with diethylene triamine (DETA) as a chain extender reacting with toluene‐2,4‐diisocyanate (TDI). The average diameter of microPCMs is in the range of 5–10 μm under the stirring speed of 3000–4000 rpm. Optical and SEM morphologies of microPCMs had ensured that the shell was regularly fabricated with the influence of SMA. FTIR results confirmed that the shell material was polyurethane and the SMA chains associated on core material reacted with TDI forming a part of shell material. The shell thickness was decreasing in the range of 0.31–0.55 μm with the molar ratio of DETA/TDI from 0.84 to 1.35 and the weight of core material increasing from 40 to 80% (wt %). By controlling the weight ratio of PCM as 40, 50, 60, 70, and 80% in microPCMs, it was found using DSC that the T_m and T_c of microPCMs were in the range of 29.8–31.0^oC and 21.1–22.0°C and an obvious phase change had been achieved nearly the same temperature range of that of PCM. The results from release curves of microPCM samples prepared by 1.4, 1.7, and 2.0 g of SMA indicated the release properties were affected by the amount of the dispersant, which attributed to the emulsion effect and shell polymerization structure. The above results suggest that the shell structure of microPCMs can be controlled and the properties of microPCMs determined by shell will perform proper practical usage. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4996–5006, 2006     

方波扫描路径确定声源声功率误差特性分析

改进了矩形测量面方波扫描路径测量声功率的误差模型 ,以单极子、偶极子及四极子声源为例 ,给出了扫描方向、测量面离声源的距离及扫描线的密度的选取对理论误差的分布图形。分析结果表明 :对选定的测量面 ,在扫描线密度小的情况下 ,通过调整声源离测量面的距离 ,可以在声源近处找到一个最优点或较优点 ,使理论误差为零或很小 ;在绝大多数情况下 ,沿测量面长边扫描误差比沿短边扫描小。     

The Effects of Filtered Channel Quality Feedback on Throughput of Proportional Fair Algorithm

1　IntroductionSchedulingalgorithmsarewidelystudiedforwirelesspacketdatasystems,whichgenerallyhavetwobasiccategories,oneisoptimizedforsystemthroughputandfairness[1～ 2 ] ,andtheotherisforthequalityofservice[3～6] .Forsystemswherepack etdataaretimedivisionmultiplexedacrossusersonthedownlink ,orfromBaseStation (BS)tomultipleMobileStations(MS) ,theBSusesschedulingalgo rithmstodecidewhichuseristransmittedto .ItisindicatedinRefs.[7,8]thatschedulingonlyoneus eratatimeisoptimalfromthepointofviewo…     

Effect of nitrocarburizing on sulphide layer during nitrocarburizing-sulphurating treatment

Compared with the single sulphurating treatment, the duplex treatment of nitrocarburizing-sulphurating can more effectively improve the properties of steel such as friction-reducing, wear resistance and anti-scuffing. Under the same processing parameters, the sulphide layers were fabricated on the surface of CrMoCu alloy cast iron by single ion-sulphurating treatment and nitrocarburizing-sulphurating duplex treatment, respectively. Through the analysis of the sulphide, the effect of the nitrocarburizing on the fabrication of the sulphide layer was investigated. And the result shows that the fabrication of sulphide layer is promoted by the nitrocarburizing treatment.     

试析当前汉语流行语中的英语借词现象

考察当前汉语流行语中英语借词现象的成因,并分析其不同的吸收方式及各自的理据和语用价值,最后对这一现象今后的发展做出顺应时代且符合语言发展规律的预测.     

大港油田CNG加气站技术特点

天然气作为我国最主要能源之一，其应用领域在不断地扩展。由于天然气受管网敷设的限制。在压缩、储运等方面的技术也引起了众多企业的重视，并成为一些企业发展的战略目标。2004年大港油田依靠地域和气源的优势，建成了天津市首座CNG加气站。经过一年来的生产运行，显现出较好的经济效益和良好的发展前景。从环保性、安全性和经济性等方面阐述了CNG技术特点和发展的优势，对大港油田已建CNG加气站的主要设备、工艺流程、技术特点以及市场发展前景进行了较详尽的阐述。     

一种数字语音通信系统的DSP实现

介绍了一种甚低频低码率数字通信系统的实现方案，该方案中的软件采用混合编程的方法，硬件则用DSP实现，文章给出了整个系统的DSP软硬件调试方法，并通过调试结果表明该方案具有很好的可行性和实时性。     

辽河东部凹陷北部不整合类型及油气成藏规律

不整合对油气藏形成有重要作用。辽河幼陷东部凹陷北部地区不整合较发育，根据实际资料研究沙三段顶面不整合类型(削截、平行和超覆)和不整合面上下6类岩性接触关系的平面分布。不整合类型和不整合面上下岩性接触关系不同，对油气藏形成的作用不同：下泥上砂的削截和平行不整合可在不整合面之上成藏；下砂上泥的削截不整合易在不整合面之下形成不整合遮挡油气藏；地层超覆不整合可形成地层超覆油气藏；不整合面上下均为砂岩，可作为沙三段烃源岩生成油气的运移通道；不整合面上下均为泥岩，可起封堵和区域盖层的作用。根据上泥下砂的不整合面分布区有利于形成不整合遮挡油气藏的认识，预测青龙台构造高部位和茨榆坨潜山的低带是有利目标区。图5参12