输气管道投产置换过程气体混合规律研究

目前国内输气管道置换工艺主要依据人工经验进行，存在较大的盲目性，导致天然气管道投产成本较高，安全风险较大，有必要对输气管线安全投产工艺进行科学、系统的研究，实现输气管道的安全、高效、经济投产模式。文章讨论了现有置换工艺中不同的置换方式，认为不加隔离器的置换方法具有置换效率高、费用低以及安全可靠等优点，是一种有前途的新工艺、新方法。同时，为确保置换过程的安全性，针对置换过程中注氮量确定的盲目性问题，采用模拟试验方法，研究了天然气与氮气、氮气与空气混合段在不同流速和背压下长度的变化规律，从而为确定合理的用氮量提供了理论依据。     

The Importance of Shared Environment in Infant-Father Attachment: A Behavioral Genetic Study of the Attachment Q-Sort.

In this first behavior genetic study on infant-father attachment, we estimated genetic and environmental influences on infant-father attachment behaviors and on temperamental dependency, both assessed with the Attachment Q-Sort (AQS; B. E.Vaughn & E. Waters, 1990; E. Waters, 1995). Mothers of mono- and dizygotic twins (N = 56 pairs) sorted the AQS with a focus on the infant's behaviors in the presence of the father. Genetic modeling showed that attachment was largely explained by shared environmental (59%) and unique environmental (41%) factors. For dependency, genetic factors explained 66% of the variance, and unique environmental factors including measurement error explained 34%. Attachment to father appears to be, to a significant degree, a function of the environment that twins share. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

碳纤维增强混凝土构件正截面计算的双界限系数法

以材料的力学性能分析为基础，利用双界限系数将碳纤维增强混凝土受弯构件划分成三种正截面的破坏形态，对每一种破坏形态，建立了单、双筋矩形截面极限承载力的计算式，使碳纤维增强混凝土构件正截面计算与现行的规范相一致。     

TRVs and fault clearing stresses in extra-high-voltage radial networks

To cope with the high rate of increase of power demand in the main industrialized districts in Japan, 550-kV transmission systems covering the districts have been reinforced, with most of the main power plants connected directly to these systems. Through 550-/300-kV substations, the majority of power to the districts is supplied by 300-kV systems. To limit the excess short-circuit capacity in the 300-kV systems, they tend to be reconstructed as so-called radial networks. In radial networks with high short-circuit capacity and relatively small number of transmission lines connected to the substation busbars, the rate of rise of TRV can be far higher than standard value. This paper analyzes the transient recovery voltages (TRV) in such extra-high-voltage radial networks in Japan, together with the relevant stresses to circuit-breakers during fault clearings. Future system conditions have also been introduced. As the typical rate of rise of the TRV values, more than twice that of today's standard ones are probable.     

渤中28－1（BZ28－1）油田N6H水平井动态分析

本文以渤中２８－１（ＢＺ２８－１）油田Ｎ６Ｈ水平井为例，从多方面对该井的动态和产能变化进行了系统分析，所用的方法对水平井动态分析有一定的指导意义。     

骑马岭水电站砂石加工系统规划设计

介绍了骑马岭水电站砂石加工系统的料源规划、系统规划设计、系统工艺流程及环保措施。该加工系统采用的典型的二段破碎工艺，对中小型水电站混凝土骨料生产系统的设计具有一定的参考价值。同时，该加工系统在废水处理水回收利用及细砂与石粉回收、防尘、降低噪声，以及固体废弃物处置等方面，均采取了相应的环保措施，以减少其对施工人员和周围环境的影响。     

环境因子的定义及研究现状

从普遍接受的三个基本假设出发，讨论环境因子的定义和失效机理不变的约束条件，重点综述环境因子的研究现状和常用方法，并探讨引入反应论模型解决环境因子预测问题的可能途径。     

固定式塔吊基础设计与施工技术

潘家园小区工程建筑面积3．6万m^2，地下3层，地上28层。基槽标高-10.750m，地面至屋面女儿墙上口高度为83m，地上标准层层高2．8m。采用土钉墙护坡，坡度1：0．1，该工程的地质条件适宜桩基础的施工。     

Experimental study of composite cold-formed steel C-section floor joists

Twelve large-scale slab specimens and twenty-two companion push-out specimens were tested to study the behavior and capacity of composite slab joists consisting of cold-formed steel C-sections and concrete. Four shear transfer mechanisms, including surface bond, pre-fabricated bent-up tabs, pre-drilled holes, and self-drilling screws, were employed on the surface of the flange embedded in the concrete to provide shear transfer capacity. Results indicated that specimens employed with shear transfer enhancements showed a marked increase in strength and reduced deflection compared with those relying only on a natural bond between steel and concrete to resist shear. Of the three shear transfer enhancements investigated, bent-up tabs provided the best performance at both the strength and serviceability limit states, followed by drilled holes in the embedded flanges. The use of self-drilling screws resulted in the lowest strength increase. The correlation of shear transfer capacity of push-out specimens with the ultimate capacity of large-scale specimens indicated that the average experimental flexural capacity of the slab specimens was approximately 1.16 times the average predicted value based on push-out test results.     

High accuracy path tracking for vehicles in presence of sliding: Application to farm vehicle automatic guidance for agricultural tasks

When designing an accurate automated guidance system for vehicles, a major problem is sliding and pseudo-sliding effects. This is especially the case in agricultural applications, where five-centimetre accuracy with respect to the desired trajectory is required, although the vehicles are moving on slippery ground. It has been established that RTK GPS was a very suitable sensor to achieve automated guidance with such high precision: several control laws have been designed for vehicles equipped with this sensor, and provide the expected guidance accuracy as long as the vehicles do not slide. In previous work, further control developments have been proposed to take sliding into account: guidance accuracy in slippery environments has been shown to be preserved, except transiently at the beginning/end of curves. In this paper, the design of this control law is first recalled and discussed. A Model Predictive Control method is then applied in order to preserve accuracy of guidance even during these curvature transitions. Finally, the overall control scheme is implemented, and improvements with respect to previous guidance laws are demonstrated through full-scale experiments.