变化性的

Because ventilation can only be increased or decreased, a combination of a respiratory acidosis and a respiratory alkalosis is impossible.

由于肺通气量的变化只能是增加或是减少这两种可能。因此呼吸性酸中毒合并呼吸性碱中毒的混合模式不可能存在。

By dehydrochlorination reaction the poly[(2-methoxyl-5-octyloxy)phenylene vinylene] is synthesized and the material"s structure is characterized by nuclear magnetic resonance spectroscopy, infrared absorption spectrum, ultraviolet and visible spectrophotometry. At the meantime, the fluorescence spectrum is measured and the mechanism of fluorescence occurring is analyzed. Thermal Gravimetric Analyzer"s results show that the MO-PPV"s thermal stability is fine. Also the experiment of resolvable property indicates that the MO-PPV can well dissolve in chloroform. Through analyzing the film"s surface by Metaloscope and Atomic Force Microscope, the good filming is found.

通过脱氯缩合法合成了聚(2-甲氧基-5-辛氧基)对苯乙炔，并分别用核磁共振波谱法、红外吸收光谱法、紫外-可见分光光度法等对其进行了结构表征；测量了样品的荧光光谱，分析了荧光产生的机理；热失重仪分析了材料的热稳定性，研究表明MO-PPV材料具有良好的热稳定性；溶解性实验发现材料在氯仿中溶解性较好；金相显微镜和原子力显微镜研究了薄膜的表面形貌，发现该材料的成膜性良好；材料的导电性研究表明，固体材料在掺杂下才可以表现出导电特性，而配成溶液的材料导电性因溶剂的不同而不同，并随溶解时间的长短发生变化。

Expression of NR1 subunit on cultured cerebral cortical neurons of fetal rats has developmental changes, which is related to neuronic maturity.

体外原代培养的胎鼠大脑皮层神经元NR1亚基有发育性变化，这种变化与神经元的成熟度有关。

Our aim in this observational, prospective, noncontrolled studywas to detect, in 29 patients who underwent abdominal aorticaneurysm surgery, correlations between the incidence ofpostoperative organ failure and intraoperative changes in arterialand portal blood lactate; changes in intramucosal sigmoid pH; differences between sigmoid PCO2 and arterial PCO2 ( CO2);and hemoglobin.

我们在这个观察性、前瞻性、非对照研究中的目的是探求29例腹主动脉瘤手术后患者器官衰竭发生率与术中动脉和门静脉乳酸变化、乙状结肠粘膜内 pH变化、乙状结肠粘膜 PCO2和动脉 PCO2差值（ΔCO2）以及血红蛋白的关系。

The plant species diversity of 9 associations in the Oxytropis coerulea community of mount Wutai was studied by using richness index, Simpson index, Shannon-Weiner index and evenness index, respectively. The results indicated that: The quantity of populations and species in the community have obvious unevenness character, which leads to variation of λ. index and H' index among different associations. R1 and H' increase firstly, and then decline slowly with the increase of elevation, which reach peak value at 2100 while E1 index waves steadily with elevation change.

应用丰富度指数(R1)、Simpson指数、Shannon-Weiner指数和均匀度指数(E1)研究了9个群丛的植物种多样性，结果表明：种群数量及其种群内个体数量具有明显不均匀性，进而导致λ指数和H'指数在不同群丛间的变化，R1、H'指数随海拔高度增加表现为先上升而后缓慢下降，在海拔2100m处达峰值，E1指数则随海拔变化呈现不稳定波动。

In this dissertation,Co-Cr2O3 and Fe-Cr2O3 granular films with superiorproperties have been successfully fabricated by RF co-sputtering technique underroom and 77K substrate temperatures for the first time.The microstructure,electrical transport and magnetic properties as well as their relation to TMR effectare systematically investigated by various techniques such as X-Ray diffraction,transmission electron microscopy,electrical diffraction,X-Rayphotoelectron spectroscopyand VSM,etc.,the change of electrical transportand magnetic properties in these films with their microstructure is also shown.Someinteresting and valuable results have been obtained after the theoretical fitting ofexperimental data with the existed theory.The temperature dependence of TMReffects in these films and the way to get larger TMR effect is also studied.Our mainprincipal results obtained are as follows:(1)Microstructure and Magnetism

在本论文中，我们采用射频共溅射方法，在室温及77K的衬底温度下首次成功地制备了性能优异的Co-Cr2O3及Fe-Cr2O3系列颗粒薄膜，并利用X-Ray衍射、透射电镜、电子衍射、X-Ray光电子谱及宏观电性及磁性测量等手段详细地研究了Co-Cr2O3颗粒膜的微结构、电性、磁性及它们与TMR效应之间的关系，系统地研究了薄膜的电性和磁性随薄膜微结构的变化，通过实验数据点的理论拟合，得出了一些有价值的物理信息，探讨了磁电阻效应的温度依赖性及获得较大TMR效应的途径，主要内容可概括如下

AbstractAIM: To study the changes of refractive status and axial length in chicken form deprivation myopia and its recovery model, to observe the metamorphism of posterior sclera and to lay foundation for investigation of axial myopia pathogenesisMETHODS: Twenty-five newly incubated chicken were selected. Their left eyes were covered with semi-translucent membrane to deprive form perception for 14 days (form-deprivation group), or covered for 11 days followed by uncovered for 3 days. Unoccluded eyes in either group served as control eyes respectively. Retinoscopy and A- ultrasound were conducted to collect the refraction and axial length data.

目的：研究雏鸡形觉剥夺性近视眼及形觉剥夺性近视眼恢复模型的屈光状态和眼轴长度的变化，并观察后极部巩膜的形态学改变，为探讨轴性近视的发病机制打下基矗方法：选用新孵出的普通肉食家鸡25只，采用半透明薄膜眼罩遮盖的方法对左眼进行形觉剥夺14d或遮盖11d后，去遮盖3d。

This solves contradiction about fluidity capability and segregation capability. Through SCC"s tests on flowing property, filling performance, passing ability and segregation are done by adopting slump test tube, V funnel and L fluidity instrument, the results of SCC"s flowing property are gotten under the case whose water gel ratio and coarse aggregate are changed.

通过采用坍落度筒、V漏斗和L型混凝土流动仪实验仪器对不同骨料的自密实混凝土的流动性、混凝土的填充性和钢筋通过性、混凝土的抗离析性等系统试验，得出了在改变水胶比和粗骨料的情况下自密实混凝土流动性能的变化结果。

Then to improre the change tendency of Senile rat's bone metabolism.Conclusion Intaking high does of D-galactose for a long time can cause Wistar male rat aging and induce the changes of sclerotin meanwhile.But zeaxanthin can delay the occurrence of the changes.

结论长期大量摄入D-半乳糖导致大鼠衰老的同时可能诱发其发生骨质衰老变化，而玉米黄质可以延缓此类致老性骨质变化的发生。

The successions of livelihood mode have been proved a feasible way in the synthetic study of land use/land cover change.

变化主要是由政策主导下的森林采伐活动所推动，这反映在景观格局的变化特征上，尤其是有林地斑块在破碎化过程中规则性不断增强上。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。