研究出

The results show that, with the decrease of awareness, the number of the drivers equipped with ATIS is increased, while the total cost of the system can be reduced.

研究结果显示，随着出行者对道路实际情况认识程度的降低，可以通过提高装备ATIS设备的出行者比率，使得出行者能够合理地进行路径选择，从而降低系统总费用。

Special attention was paid to the corelationship of lan dscape pattern index and population proˉ portion. Results showed that the diversity and evenness of landscape p attern in Luoyang urban area were on a low level, none of the landscape types exhibited high domina nce,and the green land landscape was in better state.

结果表明，洛阳市区各个研究区景观多样性整体程度不高、分布均匀程度较低且由某种景观占绝对优势的现象较少，绿地景观整体较好；同时相关分析中，城市化率与各个景观格局指数间相关程度较低，其中与景观多样性、均匀度、优势度、破碎度均呈现出负相关性，而只和景观破碎度表现出一定的显著性。

This paper presents the authigenic CO2 flooding mechanism and selects the authigenie CO2 flooding system based on taking reaction speed and economic factors into account. Evaluation is conducted on the effect of the selected CO2 system on expansion viscosity reduction in crude oil. The flooding mechanism and effect of the system is studied by using microscopic models and physical models.

给出了自生CO2驱油机理，在考虑反应速度、经济因素的基础上，筛选出自生CO2体系，对优选出的体系进行原油膨胀、降黏效果评价实验，并利用微观模型和物理模型研究了其驱油机理和效果。

Results show that the G and S units of wheat original lignin consist of 25. 35mol% uncondensed G units, 17. 60mol% uncondensed S units and 37. 05mol% condensed G units. The dissolution rate of S units is faster than that of G units in SFP—AQ and AP—AQ cooking. The residual lignin in SFP pulp has smaller amount of DPM structure and thus has better bleachability compared with those in AP pulp.

研究结果表明麦草原本木素G和S单元由25.35mol％的非缩聚G单元，17.60mol％非缩聚S单元和57.05mol％的缩聚G单元组成；在SFP—AQ和AP—AQ蒸煮中，木素S单元的溶出速率大于G单元的溶出速率；与AP浆比较，SFP浆中残余木素含有较少的DPM结构，从而具有较好的可漂性能。

Given the current complexity of industrial recovery of 3'-methyl-2'-butenyl 3, 3-dimethyl-pentenoate and the decomposition problems with 2-methyl-1-butene, research was conducted on a process for direct recycling of MBDP involving an ester exchange reaction of MBDP with either methanol, trimethyl orthoacetate, or solutions of methanol and trimethyl orthoacetate.

针对目前工业上回收3，3-二甲基－4-戊烯酸－3'-甲基－2'-丁烯酯工艺复杂、异戊烯大量分解问题，研究了MBDP直接返回循环使用工艺，MBDP与甲醇、原乙酸三甲酯或与甲醇原乙酸三甲酯混合溶液进行酯交换反应的回收新工艺，比较了四异丙基钛酸酯、甲醇钠、氢氧化钾用作酯交换催化剂的效果，筛选出回收MBDP&一锅煮&最佳工艺：按照n：n：n：n＝1.0：9.8：9.2：0.05物质的量比投料，74℃~78℃反应21h，MBDP转化为贲亭酸甲酯和异戊烯醇，单程转化率87.7%，用85%的磷酸中和甲醇钠，蒸出甲醇，直接用于合成贲亭酸甲酯。

The effect of zeolites ion-exchanged by transition metals on thermal catalytic cracking reaction is studied. The product distributions of the cracking reactions catalyzed by theβor ZSM-5 zeolites exchanged with transition metals are different from that catalyzed by corresponding Hzeolites, which means the mechanism of cracking reactions has varied. Group Ⅷ metals Fe, Co, Ni and Cu, Zn are shown to be of strong catalytic activity of oxidative dehydrogenation, while Ti and Cr are not of oxidative activity. Catalyzed by zeolites or catalyst containing Ag, conversion of thermal catalytic cracking reactions and the yield of ethylene increase while the yield of propylene does not decrease. Silver can not only promote the formation of carbonium ion, but also convert carbonium ion into free-radical via redox reaction. The weak adsorption of olefins on silver reduces the occurrence of hydrogen transfer and dehydrogenation. As a result, the yield of light olefins is favored by silver in the catalyst.

采用过渡金属交换的分子筛作为催化剂，进行催化热裂解制取乙烯的反应，研究发现，在β沸石分子筛和ZSM-5分子筛中引入过渡金属后，催化热裂解反应的产物分布与相应的氢型分子筛相比有了较大的变化，说明过渡金属的加入对于催化热裂解反应的机理具有影响，Ⅷ族金属如Fe、Co、Ni和第Ⅰ、Ⅱ副族Cu、Zn表现出较强的氧化脱氢活性，产物中氢气、焦炭的产率很高，Ti、Cr则未表现出氧化作用：分子筛及催化剂中引入银后，催化热裂解反应的转化率和乙烯的产率有了提高，丙烯产率没有很大的变化，说明银在催化热裂解反应中能够促进正碳离子的生成，又有可能通过氧化-还原作用部分改变反应机理，促进了自由基的生成，并且由于银对烯烃的吸附很弱，其氢转移反应和脱氢、加氢活性比较低，有利于烯烃产率的提高。

Studies on genetic diversity: 252 bands were amplified by 20 primers in Carya cathayensis ,168 bands were polymorphic and PPB was 66.7%. 238 bands were amplified by 20 primers in C.dabieshanensis .162 bands were polymorphic and PPB was 68.1%.

群体遗传多样性研究：20条引物在山核桃群体中共扩增出252条谱带，其中，多态性条带168条，PPB为66.7％；20条引物在大别山山核桃群体中共扩增出238条谱带，其中，多态性条带162条，PPB达68.1％。

Although it is widely believed that ovarian epithelial tumours arise in the coelomic epithelium that covers the ovarian surface, it has been suggested that they could instead arise from tissues that are embryologically derived from the Mullerian ducts.

虽然普遍认为卵巢上皮性肿瘤出现在覆盖卵巢表面的体腔上皮，有研究提示它也可以出现在胚胎学上来自苗勒管的组织。

And the feasibility of the two measurement methods is demonstrated.3 Computer simulation is performed in the situation of air passing by a heating columned thermistor through a round pipeline. The fluid velocity and temperature distributions under different mass flowrate are shown. They reflect the impact the heating thermistor has on the fluid. The velocity distribution on the surface of the heating thermistor is studied and the impact of natural convection is revealed. The lower limit of measurement based on the simulation result is given.

仿真实验结果给出了不同空气质量流量下加热元件周围流体的速度和温度分布，直观反映了加热元件对流动产生的影响；研究了发热元件表面流体的速度分布，揭示了由浮升力引起的自然对流对流量测量的影响，给出了测量下限值的仿真结果；并通过仿真实验数据验证了恒功率热消散式热式流量计的流量方程。

Two kinds of N-node tandem open queueing network system with exponential distribution are analyzed in this paper . The generater matrixes of Markov process are given in recurrence formulate.Seperately, the solution of the system stability,the stationary combinable distribution of each node queue length and the busy time distribution is obtained by means of matrix analysis in the second mo del. Moreover we gave out the Matlab program for sloving the system stability solution .

在本文中，我们主要研究了两类服从指数分布的有限容量的N级串联排队系统模型，分别采用递推的方式给出了高维马尔可夫过程的转移矩阵，在本文模型二的假设下利用矩阵分析方法进行求解，得到了该系统的稳态解及其系统各级队长的稳态联合分布，系统忙期长度分布等其它指标，且给出了求稳态解的Matlab程序。

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。