一类混合单调算子的不动点定理及其应用

本文利用半序方法研究了一类混合单调算子 ,在非紧性非连续性假设下得到了不动点的存在唯一性 ,并把所得结果应用于RN 上的Hammerstain积分方程之中     

关于剖视画法中应注意的几个问题

本对《机械制图》国家标准剖视画法及其标注方法中的一些重要问题、疑难问题作了阐述;对图样中常见的错误,以正、误对比的方式加以分析,以便正确地理解与贯彻标准。     

表面形貌和表面的摩擦学作用

该文叙述了表面形貌的数学模型;分析了表面接触的力学过程;文章还阐述了部分ＥＨＬ的形成原理并介绍了表面摩擦学行为的观察分析技术。     

现代汉语词缀问题探讨

现代汉语的词缀系统一向被认为是封闭的 ,缺乏活力的。而近二十年来这个系统发生了显著的变化 ,一批传统词缀重新活跃起来 ,而更加引人注目的是一批新词缀形成 ,并参与构词 ,为汉语的词缀系统带来了生机。就目前状况看 ,汉语的词缀数目增多 ,构词能力增强 ,许多新造派生词进入交际 ,从而导致了汉语派生构词手段的发展     

利用2,4-二硝基苯肼做吸附剂进行现代居室中痕量甲醛的富集定量

本文用敷有2,4-二硝基苯肼的高分子多孔微球做吸附剂,将甲醛富集起来,然后用乙腈溶剂脱附,再通过一个5μm的C18柱进行分离,最后用高效液相色谱法测定。     

影响陕南地区普通话水平测试成绩的相关因素

本文运用数理统计法,分析数据中所包含的信息,挖掘出影响普通话水平测试成绩的因素.     

两性表面活性剂的研究进展

综述了两性表面活性剂的特点、性能、合成及其用途的研究进展.     

一类PDE曲面的动态变形设计及应用

研究了一类偏微分方程(PDE)曲面的动态变形方法.将模型的特征线用动力学四阶偏微分方程来描述,特征线发生改变后,通过采用PDE方法来重构出变形后的曲面模型,则曲面的变形即可相应地由特征线的变形得到.该方法只需要对PDE的几个参数进行调整就可以控制曲面的变形,简单易操作.所得的曲面变形效果自然连贯,在艺术曲面造型设计中具...     

The effects of transport by pneumatic tube system on blood cell count,erythrocyte sedimentation and coagulation tests

Introduction:

Today, the pneumatic tube transport system (PTS) is used frequently because of its advantages related to timing and speed. However, the impact of various types of PTS on blood components is unknown. The aim of this study was to examine the influence of PTS on the quality of routine blood cell counts, erythrocyte sedimentation, and certain blood coagulation tests.

Materials and methods:

Paired blood samples were obtained from each of 45 human volunteers and evaluated by blood cell count, erythrocyte sedimentation, and several coagulation tests, including prothrombin time (PT) and activated partial thromboplastin time (aPTT). Blood samples were divided into 2 groups: Samples from group 1 were transported to the laboratory via the PTS, and samples from group 2 were transported to the laboratory manually. Both groups were evaluated immediately by the tests listed above.

Results:

The blood sample test results from groups 1 and 2 were evaluated and compared. No statistically significant differences were observed (P = 0.069–0.977).

Conclusion:

The PTS yielded no observable effects on blood cell counts, erythrocyte sedimentation, or PT and aPTT test results. We concluded that the PTS can be used to transport blood samples and yield reliable results for blood cell counts, erythrocyte sedimentation, and several coagulation tests.     

一类偶数阶偏微分方程的振动判据

用微分不等式方法讨论了一类偶数阶中立型偏微分方程的振动性 ,得到了该类偏微分方程振动的判据