公路振动标线划线机控制系统

提出了通过可编程序逻辑控制器（PLC）、编码器和人机界面对公路振动标线划线机进行控制。利用人机界面选择所需线型和划线长度，通过PLC的高速计数器和编码器对划线机所走路程进行精确检测，可在野外恶劣环境中精确划出所需线型。     

Na_3AlF_6-AlF_3-Al_2O_3-CaF_2-LiF-NaCl系电解质密度的研究

研究了电解质中加入氯化钠,并用氯化钠取代部分氟化锂的电解质体系的密度.采用电子天平与计算机串口相结合的测量技术,根据阿基米德定律确定电解质体系的密度,误差小于1%.利用该方法,通过四因素四水平正交实验研究了Na3AlF6-AlF3(10.87%~16.67%)-Al2O3(3%)-CaF2(4%)-LiF(0~6%)-NaCl(0~8%)体系电解质密度,并且根据测量结果建立了该体系的密度数学模型:tρ(g.cm-3)=2.897 1-0.003 07AlF3(w/%)+0.003 041LiF(w/%)-0.009 32NaCl(w/%)-0.000 85t(℃).分析了不同分子比、氟化锂添加...     

《河北理工学院学报》被博硕论文引用的统计分析

《河北理工学院学报》有比较高的学术影响力,被2004年、2005年67所研究生学位授予单位的191篇博硕论文引用;博硕论文引用《学报》论文有鲜明的学科专业属性,相同、相近的学科专业之间互引度更高;《学报》被引论文的共同特点是理论性、实践性、创新性和综合性强。     

Towards genetic genome projects: genomic library screening and gene-targeting vector construction in a single step.

We have developed technologies that simplify genomic library construction and screening, substantially reducing both the time and the cost associated with traditional library screening methods and facilitating the generation of gene-targeting constructs. By taking advantage of homologous recombination in Escherichia coli, we were able to use as little as 80 bp of total sequence homology to screen for a specific gene from a genomic library in plasmid or phage form. This method, called recombination cloning (REC), takes only a few days instead of the several weeks required for traditional plaque-lift methods. In addition, because every clone in the mouse genomic library we have constructed has a negative selection marker adjacent to the genomic insert, REC screening can generate gene-targeting vectors in one step, from library screening to finished construct. Conditional targeting constructs can be generated easily with minimal additional manipulation.     

容栅数显卡尺同步显示软件设计

介绍了容栅式数显卡尺同步显示装置的硬件、软件设计.该同步显示装置是把数显卡尺RS232接口输出信号送入以8051单片机为基础的信号处理电路,配以数据接收、数据处理、数据显示等软件,实现测量信号远距离传输,该装置在机床标尺等数显装置中广泛应用.     

复合离子聚合物调剖剂深部调剖机理研究

对复合离子聚合物调剖剂的组成和化学反应原理进行了研究 ,根据大庆油田目前所用的配方 ,通过室内实验得到了相对分子质量不同的多种配方调剖剂 ,并对其成胶特点、在岩心中物理堵塞作用的大小、以及用量对调剖效果的影响进行了分析。研究结果表明 ,复合离子聚合物调剖剂的交联时间可以控制 ,成胶时间从 2天到十几天不等。成胶后强度大 ,粘度大于 2 0Pa·s且有效期长 ,在实验观察 9个月的时间里 ,冻胶的粘度没有明显降低。另外 ,复合离子聚合物调剖剂对地层的堵塞作用大 ,地层条件下可使渗透率降低 6 0 %以上。该调剖剂已在大庆油田进行了矿场试验 ,并取得了良好的调剖效果     

硼钛复合纤维拉伸曲线分析

研究了硼钛复合纤维在拉伸过程中的行为，结果表明：复合纤维的变形是由纤维的弹性应变与基体的弹塑性应变复合迭加而成，并且在纤维与基体结合十分牢固，基体组元体积分数又较少的情况下，复合纤维表现为高强度，高弹性模量及低塑性，将试验结果同理论计算模型进行了比较，所得结果基本一致。     

2ZKX2148型直线振动筛侧板的有限元动力学分析

以结构力学理论为依据,以有限元ＳＡＰ５程序为计算手段,提出了一种直线振动筛侧板的动力学强度的计算方法,并分析了这类振动筛在侧板上产生裂纹的原因．     

Oldest playable musical instruments found at Jiahu early Neolithic site in China

Excavations at the early Neolithic site of Jiahu in Henan Province, China have produced what may be the earliest complete, playable, tightly-dated multinote musical instruments. Jiahu was occupied from 7000 BC to 5700 BC, considerably antedating the well known Peiligang culture. Here we describe six exquisitely made complete flutes which were found in radiocarbon-dated excavation layers, along with fragments of perhaps 30 more. The flutes are made from the ulnae of the red-crowned crane (Grus japonensis Millen) and have 5, 6, 7 and 8 holes. The best preserved flute has been played and tonally analysed. In addition to early musical artefacts, the archaeological record at Jiahu contains important information on the very foundations of Chinese society. We describe the archaeological characteristics of the Jiahu site, details concerning its dating, its place in the prehistory of the Chinese Neolithic, the ethnicity of its population and the results of a tonal analysis of a nearly 9,000-year-old musical instrument found there.