MODIFICATION THE CEMENTIOUS MATERIAL OF ULTRA-HIGH-STRENGTH SLEEPER CONCRETE

This paper presents investigation results on the natural ultra-fine mineral flour of crystalline silica fume (CSF) and porous quartz sand stone (PQSS) which can modify cement mortar strength under hydrothermal synthesis reaction (HSR) in the autoclave-cured condition. The replacement of cement by CSF and PQSS can signifi cantly increase the flerural and compressive strength. which reach 22MPa and 150MPa respectively, and decrease the porosity of the cement mortar. The ratio of fine aggregation, standard sand to cementious material has significant influence on the mortar strength. The mechanisms involved in cement and natural mineral flour and the HSR are presented. CaO/SiO_2 ratio ranges from 3.20 to 1.11. the main hydrate phase is C_2SH and there is not Tohermorite through X-Ray diffraction qualitative analysis. The new and ultra-high strength cementbms material as basic material of sleeper concrete can be used in prestressed reinforcement sleeper concrete.     

甘露低聚糖锌配合物对尿素吸附的研究

研究了甘露低聚糖锌配合物对尿素的吸附,探讨了pH值、甘露低聚糖锌结合率、作用时间、尿素初始浓度4个因素对尿素吸附的影响,通过正交试验确定了甘露低聚糖锌配合物对尿素吸附的最佳条件：pH值为7.5,甘露低聚糖锌配合物的结合率为40%,反应时间为1.8h,尿素初始浓度为2.0 mg/mL,在此条件下尿素的吸附量最高可达66.7 mg/g,表明该配合物对尿素有很好的吸附作用.     

PREPARATION AND PROPERTIES OF CRYSTAL GLASSES WITHOUT LEAD CONTENT

BaO is the most common consideration in the preparation of new crystal glass jor getting rid of lead content in the glass and ceramic mares to protect hu-man health and environment. But for keeping the glass products' properties to meet the requirements oj the traditional crystal glass, B2O3,A12O3, TiO2,SrO and ZnO etc ( at a special ratio ) had been researched with BaO to constitute a mixture to replace the lead content in the glass compositions. The results Amu that both using the mixture and adding Less lead in the hatches could make the new glass products to reach the requirement of the properties oj the common crystal glass but with less or no lead content and the corresponding poisons.     

企业生命力与保本点开工率初探

文章指出，判断企业生命力一是应该确定“生”与“死”的临界点，即保本点，二是应确定保本点产销量与企业最大产销量之间的差距。综合反映这两点的是保本点开工率。并指出保本点开工率可以判断企业有无生命力及生命力的强弱，企业风险大小、企业生命力的弹性、企业规模是否合理以及增强企业生命力的方向。最后阐述了降低保本点开工率以强企业生命力的几种方法。     

应用微机建立菜油氢化模型的研究

通过一系列正交实验,应用微机导出了高芥酸、低芥酸品种莱油氢化的反应速率模型和产品熔点模型。这些模型中含有温度、压强、催化剂浓度和搅拌强度等操作参数,反映了这些操作参数对氢化反应速率和产品熔点特性的影响。该模型可用来预测在实验值范围内某组操作参数下的反应速率和产品熔点,反过来,也可用来预测某个特定产品所需的最小催化剂用量,以指导工业生产。     

RESEARCH ON THE HIGH PERFORMANCE COMPOSITE ROAD CONCRETE

Ordinary concrete presents short service life when used for building and repairing high-grade road with heavy traffic due to its large brittleness, poor bending flexibility and serious shrinkage on drying. In this paper, a new kind of high performance concrete has been designed by means of combination of organic, inorganic material as well as metal material. The research and applicatino have shown that this new, concrete can significantly counteract the deficiency of ordinary concrete and give excellent mechanical properties and pavement performances. The application of this new, kind of concrete is of great social and eco nomic significance.     

裂缝性油藏渗吸模型参数确定方法及应用

针对实验设备和测试手段受限制、实验方法周期长、价格昂贵和误差较大的特点,提出了采用油藏生产历史数据进行线性回归来确定模型参数的新方法,建立了裂缝性油藏产量预测及最大渗吸速度发生时间的数学模型.通过实例分析和对比,验证了该方法的可靠性.对裂缝型油藏水驱开采动态研究具有参考价值.     

优质饲用豆粕的工艺研究

本研究以脱脂后的大豆粕为原料，模拟大豆粕脱溶工序，研究水分、温度和时间对大豆粕中尿素酶活性的影响和有效赖氨酸的保留率以及尿素酶活性与赖氨酸保留率之间的关系，为植物油厂生产优质饲用豆粕提供最佳工艺参数。     

底水油藏水平井合理位置的确定方法研究

底水油藏中水平井的合理位置是确保水平井高产稳产、延长无水采油期的关键所在。利用镜像反映及势函数的叠加原理，在获得底水油藏中任意一点的势函数后，得到了底水油藏中水平井底势差和水平井的产量方程，由此研究影响水平井产量、临界产量及见水时间的因素，通过研究获得了底水油藏中水平井的合理位置，为水平井开采底水油藏的优化设计提供了理论基础。     

消泡剂DXP的研制

介绍了丁腈橡胶生产中单体丙烯腈回收所用消泡剂（ＤＸＰ）的研制方法,并确定了最佳配方．研制出了ＤＸＰ,得到了满意的消泡效果．     

从力学角度看冲裁间隙对冲裁件质量的影响

本文主要从力学的角度定性地阐明了冲裁间隙对冲裁件质量的影响。为选择最佳间隙提供了理论依据。并且,作者在试验和调查的基础上从三个方面提出了适用于碳钢扳和硅钢扳的最佳冲裁间隙范围。     

Sn和Cl_2合成SnCl_4的实验研究

本文对Sn和Cl_2反应过程进行了对比试验，说明生产过程应采用三相状态，并确定了最佳反应条件，为工业化生产提供了七、要的准确数据．     

Timing of advanced water flooding in low permeability reservoirs

It is very important to design the optimum starting time of water injection for the development of low permeability res-ervoirs. In this type of reservoir the starting time of water injection will be affected by a reservoir pressure-sensitive effect. In order to optimize the starting time of water injection in low permeability reservoirs, this effect of pressure change on rock permeability of low permeability reservoirs was, at first, studied by physical simulation. It was shown that the rock permeability decreases expo-nentially with an increase in formation pressure. Secondly, we conducted a reservoir engineering study, from which we obtained analytic relationships between formation pressure, oil production rate, water production rate and water injection rate. After our physical, theoretical and economical analyses, we proposed an approach which takes the pressure-sensitive effect into consideration and designed the optimum starting time of water injection, based on the principle of material balance. Finally, the corresponding software was developed and applied to one block of the Jiangsu Oilfield. It is shown that water injection, in advance of production, can decrease the adverse impact of the pressure-sensitive effect on low permeability reservoir development. A water-flooding pro-ject should be preferably initiated in advance of production for no more than one year and the optimum ratio of formation pressure to initial formation pressure should be maintained at a level between 1.05 and 1.2.     

中国蚕丝产业的抉择

本文针对中国蚕丝产业的历史和现状 ,从生产力和生产关系的角度分析了制约产业发展的基本矛盾 ,并通过和近期蚕丝生产力发展较快的巴西进行比较 ,提出应从产业模式改造、建立现代化桑园生产技术体系和工业化养蚕技术体系、发展一批以中西部地区为主的新蚕区等方面 ,重新营造中国蚕丝产业的优势。     

电力系统状态估计中选取参考节点的拓扑方法

应用网络的拓扑分析方法，探讨了参考点的选取对估计精度的影响，并提出了选取参考点的算法。     

指派问题匈牙利方法的改进

求指派问题最优解的匈牙利方法存在所谓“选择原则困难”。即:当效益矩阵的每一个行列都存在不止一个“零”时,选取哪一个“零”才能保证找到最优解呢?引入“C参数选择原则”,即可解决这一困难,从而完善匈牙利方法。     

防城港5万吨立筒库的优化设计

本文结合广西防城港５万ｔ立筒库实际工程，对设计方案的优化进行了有益的探索；从筒仓直径、组合方式、材料选择、最佳输送路线等设计参数入手，就其土建工程量、作业功能、预留发展、综合投资效益等方面进行了多方案的综合分析，从而优选出５万ｔ大容量筒库的最佳设计方案，并阐述了设计方案优化的综合分析方法。     

REDUCTION OF FERRIC IRON IN THE TITANIUM SULFATE SOLUTION BY THE ION EXCHANGE MEMBRANE PRIMARY CELL METHOD *

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对立式螺旋输送机最佳工作状态的探讨

本文通过对在立式螺旋输送机螺道内的料流剖面形状的分析,揭示了在该机工作中导致附加阻力的出现、引起动力的浪费的原因,找出了避免浪费的最佳工作状态,给出了螺距选择的合理范围,导出了在指定产量要求下机轴的最佳转速的计算公式。从而为立式螺旋输送机的设计提供了新的改进方案。     

玻璃突起路标的尺寸优化

选择几何形状较为简单、逆反射性好且铺设施工方便的玻璃突起路标进行了研究,按照光学的折射、反射原理,以玻璃突起路标的逆反射性能为优化指标,对其进行了形状尺寸的优化设计,为突起路标的生产和应用提供了理论依据。