水泥粉喷桩复合地基的研究综述

水泥粉喷桩作为一种加固地基的有效方法 ,可以较大地提高地基承载力 ,改善地基的变形特性 ,减小在荷载作用下可能发生的沉降和不均匀沉降。从水泥土的工程性质、复合地基承载力的计算以及复合地基的沉降计算几个方面分析了水泥粉喷桩的研究现状 ,并对以后研究的方向提出了见解     

成县城区建筑地基土物理力学性质

成县位于甘肃省东南部的徽成盆地,区内为区域二级流域的东河和南河,暖温带湿润气候,四季分明,潮湿多雨。通过对区内建筑地基土物理力学性质的分析,提出了地基土主要物理力学性质指标与地基土承载力标准值(fk)的对应关系。     

CFG桩复合地基承载性状分析

结合内蒙古地区某工程实例,对CFG刚性桩复合地基在软弱砂质粉土地基中的承载机理、施工工艺的特点及影响CFG桩复合地基承载力和沉降量的因素进行了分析与探讨。     

柔性桩复合地基承载力计算方法探讨

针对柔性桩复合地基承载力计算的复杂性和不确定性,本文对柔性桩复合地基承载力的计算方法进行探讨,选取指数函数为位移函数,根据弹性理论推导计算了桩体竖向位移、承载力及桩周的侧摩阻力。通过对实际工程的计算比较计算与实测结果,并分析了计算与实测结果存在差异的原因。     

不同桩体材料复合地基承载及变形性状对比试验研究

通过室内模型试验,实测得到碎石桩、夯实水泥土桩和CFG桩复合地基桩土荷载分担比、桩土应力比和桩间土深层变形,并对三类不同桩体材料复合地基的承载及变形性状进行了对比分析.认为碎石桩复合地基和夯实水泥土桩复合地基均存在有效桩长或有效复合土层厚度;碎石桩桩长超过有效桩长,对提高复合地基承载力和压缩模量、减小变形效果不明显,除一些特别情况如为处理可液化地基外,设计桩长可适当超过有效桩长,但不宜过长;夯实水泥土桩复合地基的有效桩长与桩身强度相关性显著,应以桩身强度控制进行夯实水泥土桩桩体设计,使按桩身强度确定的单桩承载力大于或等于由桩周土及桩端土的抗力所提供的单桩承载力;CFG桩复合地基桩身强度高,桩体自身压缩性小,可全桩长发挥侧阻作用,当桩端落在好的持力层时,能很好地发挥端阻,提高承载力,减小变形,设计时应优先选择好的桩端持力层进行设计.      

地基强夯处理技术在钢铁厂的应用

结合工程实例,根据具体试验所取得的数据,计算强夯处理后的地基承载力、压缩模量、复合地基承载力,计算值在安全范围之内,证实了强夯置换地基处理设计的安全性、可靠性,为以后类似工程提供了良好的借鉴。     

CFG桩复合地基在工程中的应用

在青钢活性白灰工程地基处理中,采用CFG桩复合地基技术,通过对处理后的地基试验与检测,验证了CFG桩复合地基承载力及沉降达到设计要求。同时指出了使用CFG桩时普遍存在的问题,并给出了预防措施。     

钢渣桩在某钢厂办公楼地基处理中的应用

介绍了钢渣桩的特点,并从化学反应、离子交换和凝硬反应等方面论述了钢渣桩加固软土地基的机理,阐述了某钢厂厂区软土地基采用钢渣桩处理的设计计算;从地基加固处理中的布桩形式、桩长、复合地基承载力估算等角度对加固措施进行了设计和验算。结果表明,厂区软土地基经处理后承载力得到显著提高,地基沉降明显改善,加固效果显著。     

水泥土群桩复合地基桩土应力比测试研究

桩土应力比是反映搅拌桩复合地基工作状态的一个重要参数,也是计算复合地基承载力和沉降的重要指标。通过在单桩、四桩承台下的桩周土和桩顶埋设土压力盒．获得系统的水泥土桩复合地基的桩土应力等原位试验数据。分析了群桩效应在搅拌桩复合地基中的影响,具有工程实用价值。     

自重湿陷性黄土场地双向螺旋桩复合地基承载能力试验研究

通过现场试验,分别研究在不同桩间距下,经过挤密处理后大厚度湿陷性黄土地基中桩间土的物理力学指标、非排土双向螺旋素土挤密桩(柔性桩)复合地基承载力特征值、非排土双向螺旋素混凝土挤密桩(刚性桩)复合地基承载力特征值,确定双向螺旋挤土桩技术在处理大厚度湿陷性黄土地基具有技术先进、稳定可靠的特点,同时具有一定的环保优势。     

配合煤胶质层的最大厚度(Y值)和粘结指数(G值)相关性分析

在焦化化验工作中，配合煤胶质层的最大厚度(Y值)和粘结指数(G值)这两种数据问存存着一定的关联，Y值与G值具有相关性，在一定区域内能导出一元线性回归方程，并进行显著性检验。可以用已知的G值预测Y值，或用已知的Y值预测G值，对于检测化验数据的准确与否有着重要的意义。     

宾馆用户热电冷联产系统方案优化

对应用于宾馆用户的热电冷联产系统进行方案优化,得到在不同建筑面积下所对应的最优设计方案及性能指标。以净现值率为目标函数,对宾馆用户在不同地区优化方案进行对比分析,结论为：在严寒地区的经济效益最好,其净现值率在2.1-4.1范围内变化,其次是夏热冬冷和寒冷地区,其净现值率在1.2-2.6范围内变化,夏热冬暖地区的经济效益最差,其净现值率在1.0-2.4范围内变化。     

Effect of Baking Process on Microstructures and Mechanical Properties of Low Silicon TRIP Steel Sheet with Niobium

After 2% predeformation,the baking treatment with different schedule was carried out for low silicon TRIP steel sheet with niobium.The effects of baking temperature and time on microstructures and mechanical properties were investigated.The results showed that with increasing the baking temperature and time,the volume fraction of retained austenite decreases,and the volume fraction of tempered martensite increases;as baking temperature ranges from 80 ℃ to 170 ℃,the bake-hardening(BH)value increases obviously,while from 170 ℃ to 230 ℃,the variation of BH value is very slight;as baking time ranges from 2 min to 20 min,the BH value increases significantly,while the BH value decreases when baking time exceeds 20 min.So that when the baking temperature is 170 ℃ and the baking time is 20 min,the low silicon TRIP steel sheet exhibits good bake-hardening behavior,and the highest BH value is above 70 MPa.     

用人工神经网络研究钢的硬度的影响因素

 用人工神经网络研究了化学成分及热处理工艺参数对低碳低合金钢的硬度的影响。首先设计了RBF型人工神经网络模型,用“舍一法”改进了模型,使其具有较好的预测性能。然后,用神经网络研究了化学成分和冷速对低碳低合金钢的硬度的定量影响。结果表明,碳的质量分数为0.11%~0.15%时,硬度随碳含量的增加而增大;硅的质量分数为0.24%~0.38%、锰的质量分数为0.94%~1.02%时,硬度值基本不变;铬的质量分数为0~0.6%时,硬度值呈增加趋势;镍的质量分数为0~0.04%时,硬度值基本不变;钼的质量分数为0~0.2%时,硬度值从HV288降至HV282;硼的质量分数为1%~2%时,硬度随含量增加而升高;钛、铌、钒的总质量分数为0.06%~0.14%时,硬度值基本不变;冷速从10℃/m增加至170℃/m,硬度值从HV290增至HV420。     

The value of value congruence.

Research on value congruence has attempted to explain why value congruence leads to positive outcomes, but few of these explanations have been tested empirically. In this article, the authors develop and test a theoretical model that integrates 4 key explanations of value congruence effects, which are framed in terms of communication, predictability, interpersonal attraction, and trust. These constructs are used to explain the process by which value congruence relates to job satisfaction, organizational identification, and intent to stay in the organization, after taking psychological need fulfillment into account. Data from a heterogeneous sample of employees from 4 organizations indicate that the relationships that link individual and organizational values to outcomes are explained primarily by the trust that employees place in the organization and its members, followed by communication, and, to a lesser extent, interpersonal attraction. Polynomial regression analyses reveal that the relationships emanating from individual and organizational values often deviated from the idealized value congruence relationship that underlies previous theory and research. The authors’ results also show that individual and organizational values exhibited small but significant relationships with job satisfaction and organizational identification that bypassed the mediators in their model, indicating that additional explanations of value congruence effects should be pursued in future research. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Determination of the optimal cutoff value for a serological assay: an example using the Johne's Absorbed EIA

Traditionally, in order to improve diagnostic accuracy, existing tests have been replaced with newly developed diagnostic tests with superior sensitivity and specificity. However, it is possible to improve existing tests by altering the cutoff value chosen to distinguish infected individuals from uninfected individuals. This paper uses data obtained from an investigation of the operating characteristics of the Johne's Absorbed EIA to demonstrate a method of determining a preferred cutoff value from several potentially useful cutoff settings. A method of determining the financial gain from using the preferred rather than the current cutoff value and a decision analysis method to assist in determining the optimal cutoff value when critical population parameters are not known with certainty are demonstrated. The results of this study indicate that the currently recommended cutoff value for the Johne's Absorbed EIA is only close to optimal when the disease prevalence is very low and false-positive test results are deemed to be very costly. In other situations, there were considerable financial advantages to using cutoff values calculated to maximize the benefit of testing. It is probable that the current cutoff values for other diagnostic tests may not be the most appropriate for every testing situation. This paper offers methods for identifying the cutoff value that maximizes the benefit of medical and veterinary diagnostic tests.     

HY-103型便携式测振仪在发电设备上的应用

通过HY-103型便携式测振仪对旋转设备的振动进行测量，对所得到的位移（峰-峰值）、速度（真有效值）、加速度（峰值）三个参数进行计算，得出振动的主频率，从而对设备的振动故障进行诊断。     

邯钢烧结原料结构的优化研究

通过对邯钢烧结用含铁原料的单烧值和冶金价值的计算。评价了各种含铁原料的经济价值。并以此对含铁原料进行筛选。达到了优化原料结构的目的。若进一步配合烧结配矿试验则可以找出不同条件下的最佳配比。     

Relations of temperament to the choice of values.

The hypothesis that the expressed value system of an individual is related to his temperament was tested. The value system was determined from response to the Ways to Live document, and temperament was measured by the Thurstone Temperament Schedule. The Ss consisted of 250 male college students of ages 20 or 21 from colleges throughout the U. S. "The results of this study strongly suggest substantial relationships between the domain of temperament and that of value, especially for values represented by Factors B and C, Enjoyment and Progress in Action, and Withdrawal and Self-Sufficiency. Relations are less marked between temperament areas and value Factor D, Receptivity… " (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A new archival approach to the study of values and value--Behavior relations: Validation of the value lexicon.

The present effort employs a new archival approach to study values and value- behavior relations, which is likely to be particularly useful in applied settings. A value lexicon was developed on the basis of the Schwartz (1992) value theory to extract lexical indicators of values from texts. The convergent, discriminant, and predictive validity of this measure was established using American newspaper content from 1900 to 2000 vis-à-vis existing self-report measures of values and objective indicators of value-expressive behaviors. Results provide empirical support for the use of the value lexicon to study values and value- behavior relations. First, the value lexicon demonstrated convergence with self-report responses of values. Second, values in American newspapers were associated with objective indicators of their corresponding value-expressive behaviors compared with noncorresponding value- expressive behaviors. Third, patterns of values over this 101-year period exhibited meaningful fluctuations with major historical and political events. The discussion describes new possibilities for future research on values in many applied settings with the value lexicon. The discussion also suggests that the principles of the value lexicon could be adopted to measure other psychological constructs of interest to applied psychology. (PsycINFO Database Record (c) 2010 APA, all rights reserved)