工程造价中增加质量等级费的探讨

本文提出了在工程项目竣工验收阶段，按照评定的质量等级，在决算时增加质量等级费。并对质量等级费的确定方法进行了研究，给出了易于操作的计算方法。     

水混石灰综合稳定土基层的施工及质量控制

以省道204东台段养护改善工程为例,就水泥石灰综合稳定土基层的施工工艺、存在问题、施工质量控制及注意事项进行了阐述。     

Fault Early Diagnosis of Rolling Element Bearings Combining Wavelet Filtering and Degree of Cyclostationarity Analysis

The vibration signals of rolling element bearing are produced by a combination of periodic and random processes due to the machine＇s rotation cycle and interaction with the real world. The combination of such components can give rise to signals, which have periodically time-varying ensemble statistical and are best considered as cyclostationary. When the early fault occurs, the background noise is very heavy, it is difficult to disclose the la- tent periodic components successfully using cyclostationary analysis alone. In this paper the degree of cyclostationarity is combined with wavelet filtering for detection of rolling element bearing early faults. Using the proposed entropy minimization rule. The parameters of the wavelet filter are optimized. This method is shown to be effective in detecting rolling element bearing early fault when cyclostationary analysis by itself fails.     

在VC++中通过调用MATLAB实现回归分析

以界面热阻仿真软件的开发为例,详细介绍了如何在VC 中通过调用MATLAB实现回归分析,为开发专用数理统计分析软件提供一条可靠性高、开发周期快的有效途径。     

IDENTIFICATION OF CRACKED ROTOR BY WAVELET TRANSFORM

Introduction　　Dynamicbehaivoranalysis of the cracked rotorhas been investigated since 1 960 's,and now the re-searches on the faultdiagnosis and condition moni-toring of cracked rotor are paid more and more at-tentions because of its importance in industry.in1 970 's,Gasch proposed a simple hinge crack modelthat was very good for the representation of thecyclic stiffness variables and the stability lim-its[1,2 ] . With fracture mechanics,Dimarogonas andhis colleagues modelled the crack as a …     

几种人造湿地植物和土壤含氮量分析

采用凯氏定氮仪测定了藜、艾蒿、酸模、芦苇、狗尾草、水稻和野生大豆7种人造湿地植物的根、茎叶和植物生长土壤的含氮量.结果表明,艾蒿茎叶的含氮量为6.50g/kg,比野生大豆、狗尾草、酸模、水稻、芦苇和藜茎叶平均含氮量高3.85g/kg,艾蒿根的含氮量为8.66g/kg,比藜、野生大豆、酸模、狗尾草、水稻、芦苇根的含氮量平均高3.42g/kg,野生大豆生长的土壤含氮量为0.090g/kg,比自然状态、芦苇、水稻和对照土壤的含氮量平均高0.03g/kg,利用人造湿地处理污水需要植物的含氮量高和土壤的含氮量低,以便能够更有效的吸收污水中的氮.     

旱莲花隧道洞口浅埋段大变形控制技术

针对旱莲花隧道洞口段大变形问题,通过监控数据分析、现场调研和工程地质勘察等,综合各种影响因素,分析了该隧道施工中出现大变形的原因和变形破坏特征。引起大变形的主要原因包括不均匀浅埋软弱地层、拱脚承载力不足、锁脚锚杆失效、地表开裂地表水下渗等。最后提出了整治隧道大变形及侵限换拱的综合治理措施,确保了隧道安全顺利施工,并可为类似情况下隧道施工提供参考。     

汽车空调控冷剂充注量及其检查

汽车空调制冷剂充注量对制冷系统工作性能的影响；加注和补充制冷剂时如何检查和确定制冷剂的充注量。     

钻孔灌注桩遇人防时的施工技术

在钻孔灌注桩遇到防空洞时,采用混凝土护筒的施工方案,可确保工期和工程质量,满足设计要求.     

DF4型机车柴油机非正常停机的处理

襄樊北机务段现有DF4型内燃机车118台,近年来,随着武汉铁路局货运机车提速和牵引4 000 t重载的实施,DF4型机车质量状况越来越差,特别是机车非正常停机故障大幅度上升,因处理不及时造成的大破损也逐年上升,其中2004年全年因非正常停机处理不及时或不彻底,使故障扩大造成的经济损