参变量折线磨光样条的一个降维算法

提出了一个参变量折线磨光样条的降维方法,计算结果与参变量折线磨光样条计算结果完全一致,而计算过程简单。     

四元体高强低密度纤维水泥体系的研制

为了解决目前油井水泥拌合料配比设计困难的难题,进一步拓展漂珠微硅类低密度水泥体系的应用范围,基于颗粒级配增强、纤维增韧的技术思路,研制了颗粒级配增强材料KZ和早强剂ZR,并优选了长度为600μm和1050μm的化学改性纤维作为增韧材料,最终在1．15～1．45g／cm^3范围内优化设计出4种不同密度的新型四元体低密度水泥体系,并对该体系的水泥石力学性能和浆体性能进行了系统评价．实验结果表明：四元体系强度明显高于目前现场使用的同一级别的低密度水泥,改性纤维的架桥阻裂作用可显著提高水泥石韧性,水泥浆失水量和游离液含量较低,防窜能力强,稠化和流变性能满足要求,体系稳定性好,验证了四元体系粒径分布的合理性．研究结果为多元体油井水泥体系设计提供了一条新途径．     

Electron microprobe monazite Th-Pb dating and its constraints on multi-stage metamorphism of low-pressure pelitic granulite from the Jingshan Group in the Jiaobei terrane

U-Th-Pb chemical dating of monazite with the electron microprobe is a new method developed in the last dec-ade[1,2]. It is attracting more and more attention for its ad-vantages of quickness, cheapness and relative high reli-ability[3]. Although its precision (±10?30 Ma)[4,5] is not as high as the ion-probe (SHRIMP), it has very high spatial resolution (1?2 μm), more superior than other in-situ techniques for analyzing compositions of zoned monazite crystals of less than 50 μm in size. …     

用全DNA转化法构建多功能石油降解菌

以嗜蜡的不动杆菌４－１ 作为受体菌,经溶菌酶破壁后,用嗜胶的假单胞菌Ｚ１７ 的全ＤＮＡ 转化,经再生后用只含高胶油的选择培养基筛选出转化子不动杆菌ＺＨ２０．破壁及再生的最佳条件为：溶菌酶浓度１．５ｍ ｇ／ｍ Ｌ,３７℃水浴保温４０ｍ ｉｎ,破壁率为９３．８％ ,再生率达到３０．２％ ;转化条件为：３０％ ＰＥＧ６０００,５０ｍ ｍ ｏｌ／ＬＣａＣｌ２ ,于３７℃保温２０ｍ ｉｎ．ＺＨ２０ 具有嗜高胶油和高蜡油的双重性状,５０℃条件下使高胶油粘度降低２２．２％ ,使高蜡油的凝固点降低２．５℃,且保持了受体菌的耐热和耐盐性能．液蜡培养基连续传代１０ 次,性能稳定．     

拉格朗日方程平面展开式的创建

本文对利用拉格朗日方程建立平面机构动力学方程的问题,进行了新的探讨和分析,首先对多构件多自由度系数的动能提出了新的表达式,而后在此基础上推导出了拉格朗日方程平面展开式,并确切地指出了不同情况下,拉格朗日展开式中相应各项的数目。     

桃花江水环境修复技术和工程

针对桂林市桃花江水环境问题,从水文、水质、生态3个层次出发,确立了防洪排涝、污染控制、生态修复技术方案.首先,通过改造堰坝及修建排涝泵站等生态水文恢复措施解决了洪涝灾害问题;其次通过控制市政和工业废水以及非点源污染物为水质改善提供了保障,使桃花江水质从中国《地表水环境质量标准》(GB3838—2002)Ⅳ类提高到了Ⅲ类;最后生态护岸及植被配置技术促进了桃花江流域生态系统的修复,彻底改善了桃花江水环境.     

基于CPM的集装箱港口水平运输设备应急调度

通过采用CPM即关键路径法(Critical Path Method)网络的顺序优化理论,对装卸作业中集卡(集装箱卡车)出现故障等不能按原定计划作业情况下的应急调度问题进行研究,通过应用举例对带松弛变量与指定工序的2个平行工序的顺序优化决策进行可行性分析.     

Interaction between microbubble and elastic microvessel in low frequency ultrasound field using finite element method

The interaction between microbubble and elastic microvessel wall has been hypothesized to be important in the mechanisms of therapeutic ultrasound applications.In this study,a 2D axisymmetric finite element numerical model is established to study the interaction between elastic microvessel wall and oscillating microbubble in low frequency ultrasound field using fluid solid interaction method.The numerical results show that the bubble oscillation induces the vessel wall dilation and depression.The von Mises stress distribution over the microvessel wall is heterogeneous and the maximum value of the midpoint on the inner vessel wall could reach 0.23 MPa and 1.32 MPa under PNP 0.2 MPa and 0.5 MPa,respectively.When the bubble collapses,the circumferential stress decreases rapidly and the transmural pressure increases dramatically.Noticeably,the circumferential stress becomes compressive with the maximum magnitude 1.83 MPa under PNP 0.5 MPa,larger than the maximum tension value.It is possible that the rapid compression stress during bubble collapse plays important role in mechanical effect on microvessel wall endothelial lining disruption.     

Friction contact mechanisms of layered surface

In this paper,we firstly review the carbon layered surface prepared with electron cyclotron resonance (ECR) plasma sputtering. Secondly,the friction behavior of carbon layered surface under pin-on-disk testing is described. Furthermore,the contact stress evolution processes of layered surface with and without transfer layer during wear are given for understanding the contact mechanisms. Finally,a three-dimension (3D) local yield map of layered surface is introduced,which is useful to predict the possible contact mechanisms.