顺丁橡胶生产过程"门尼升值"的原因研究

研究了顺丁橡胶生产过程中门尼升值的原因。结果表明，顺丁橡胶生产后处理的膨胀干燥过程存在门尼升值现象。不同内在质量的顺丁橡胶门尼升值不同，正常条件下门尼升值发生于门尼粘度的测试过程。     

Rhizobium trifolii capsular polysaccharide: a novel biopolymer with striking physical properties

The physical properties of the capsular polysaccharide of Rhizobium Trifolii (CPS) were investigated. Viscosity measurements provided information about the hydrodynamic volume of single coils, the perturbation of solvent flow and the shear-thinning behaviour of concentrated solutions. Changes in chain geometry and the development of an intermolecular network as a function of temperature were monitored using the techniques of optical rotation and dynamic oscillation. Finally, analysis of calorimetric thermograms elucidated the type of interactions between CPS and the bacterial levan. Overall, the Rhizobium polysaccharide was found to form thermally-reversible gels at an extremely low 'minimum critical gelling concentration' (c_o∼ 0.35gl^-1). At temperatures above the gel melting point (∼ 48°C), however, the compact polymer coils entangled at comparatively high concentrations (about 60 times higher than c_o). In the presence of a highly branched levan, the thermal stability of ordered CPS structures increased as a consequence of thermodynamic incompatibility between the two polymers.     

高海拔长日低温条件下选择水稻光温敏核不育系的效果和方法研究

在高海拔长日低温、低海拔日高温、低海拔长日高温和人工气候室长光低温条件下，进行了光温敏不育水稻分离世代的不育株出现频率以及选择实用型不育系的效果和选择方法的研究。     

混凝土简支梁预设变形值探讨

以某高速公路钢筋混凝土与预应力混凝土工程为例，从简支梁的预拱度和下挠度的设置两方面进行了阐述，提出了钢筋混凝土简支梁下挠变形和预应力混凝土简支梁上拱变形的不同之处。     

Instability due to Viscosity Stratification Downstream of a Centerline Injector

A common injector geometry upstream of a static mixer is the centerline injector. A flow instability can arise due to viscosity differences between the injected core‐flow and the outer co‐flow. This instability can adversely affect the effectiveness of the mixing operation. An experimental investigation of miscible viscosity‐stratified flow in a circular geometry was performed using Laser Induced Fluorescence (LIF) and Particle Image Velocimetry (PIV). The experimental results for the stable region agree with the analytical results. The unstable region exhibits different modes depending on the viscosity ratio, volume flux ratio, and Reynolds number. The modes include wavy core‐flow with fissures and wavy core‐flow with core breakup. The time‐averaged experiment velocity profiles for the unstable core indicate a broadening of the jet at the centerline, which is consistent with the LIF visualization.     

大港油田官109-1断块稠油油藏碱/表面活性剂吞吐采油技术

大港油田官109-1断块稠油油藏的油井由于井筒、近井地带发生原油有机沉积,储层原油流动性差,采用多种方法都不能正常生产。为此研制了一种碱性解堵液,用于油井化学吞吐。该解堵液为复配碱和抗硬剂等添加剂的10%两性木质素表面活性剂溶液,能使玻璃片表面由亲油变强亲水,在石英上的接触角为6°(稀释至1/2和1/4浓度时为11°和12°),与羊大站原油间的界面张力为1.75×10-3~3.18×10-3mN/m。该解堵液与黏度1~50 Pa.s的不同区块稠油按体积比1∶1混合形成的乳状液,60℃、175 s-1黏度为2~6 mPa.s,在配液水矿化度高达6000mg/L以上或钙镁离子浓度高达250 mg/L时,该解堵液仍能保持对稠油的乳化降黏能力。该解堵液从实验岩心中驱出的原油量比地层水多75%,驱出液为乳状液。通过一个井例介绍了化学吞吐工艺:先用一种降黏解堵液对油井进行预处理,清洗油管、炮眼及近井地带,再注入碱性解堵液(该井例中为500 m3),注入时间约15小时,然后开井生产。2000年2月至2002年6月在16口新投产井实施化学吞吐(第一轮次),15口井有效,其中2口井先后转注水,其余13口井到2005年底仍继续产油。图1表6参5。     

辐射对血液流变效应的研究及动物全身照射后全血粘度的变化规律

本文结果表明经一次大剂量全身照射后的机体血液流变的主要特性为全血表观粘度先高粘后低粘的双向性变化,从照后第一天起即升高。随着放射病病程的发展,在早期有一个高粘峰,其峰均值比照前升高47.80％。但因不同动物、不同剂量、不同均速,不同血源而变化不同。     

影响聚合物段塞流变性因素的研究

本文针对我国表面活性剂/聚合物驱油的实际,研究了石油磺酸盐(PS)、正丁醇(R_4OH)和矿化水对水解聚丙烯酰胺(HPAM)溶液流变性的影响。结果表明,PS对HPAM溶液流变性的影响与介质的矿化度有关:非矿化水介质中,PS对HPAM溶液性质的影响类似于无机盐,能降低HPAM溶液的表现粘度(η_α)和稠度系数(k);当系统中含有一定浓度矿化水时,PS却能升高系统的η_α和k值,降低流型指数(n),使系统的非牛顿性增强。在含有PS和矿化水的HPAM系统中加入R_4OH,系统的η_α和k值会有所增加。     

On the design of multiple key hashing files for concurrent orthogonal range retrieval between two disks

This paper concerns the following problem: given a set of multi-attribute records, a fixed number of buckets and a two-disk system, arrange the records into the buckets and then store the buckets between the disks in such a way that, over all possible orthogonal range queries (ORQs), the disk access concurrency is maximized. We shall adopt the multiple key hashing (MKH) method for arranging records into buckets and use the disk modulo (DM) allocation method for storing buckets onto disks. Since the DM allocation method has been shown to be superior to any other allocation methods for allocating an MKH file onto a two-disk system for answering ORQs, the real issue is knowing how to determine an optimal way for organizing the records into buckets based upon the MKH concept.

A performance formula that can be used to evaluate the average response time, over all possible ORQs, of an MKH file in a two-disk system using the DM allocation method is first presented. Based upon this formula, it is shown that our design problem is related to a notoriously difficult problem, namely the Prime Number Problem. Then a performance lower bound and an efficient algorithm for designing optimal MKH files in certain cases are presented. It is pointed out that in some cases the optimal MKH file for ORQs in a two-disk system using the DM allocation method is identical to the optimal MKH file for ORQs in a single-disk system and the optimal average response time in a two-disk system is slightly greater than one half of that in a single-disk system.     

再制干酪的研究

本实验以车达干酪、高达干酪为原料干酪，添加选取85～87℃，6、5～7min的融化条件。研究选择不同成熟期、不同种类的原料干酪和添加不同比例及种类的溶解盐对干酪组织状态、风味的影响。