与...可比较的

These antennas can cover GSM900/DCS/PCS/UMTS operation. In the chapter 2, the antenna is designed based on the concept of monopole antenna. Furthermore, the antenna structure have two radiant paths and coupled each other at tail end to do impedance matching. In addition, to raise distance between radiation plane and ground will avoid capacitative effect effectually. In the chapter 3, the antenna is designed based on the concept of planar inverted-F antenna. Furthermore, that the antenna structure have two radiant paths and coupled each other at tail end to do impedance matching is similar to chapter 2. But there is a difference in them. We can choose the short position to change input impedance at this structure. In the chapter 4, the antenna is designed based on the concept of planar inverted-F antenna which takes coupled-fed. It will produce the first mode and high-order mode near the frequency, 900MHz. The feature of this type is to reduce the volume effectually. This antenna can not only cover GSM900/DCS/PCS/UMTS operation but maintain good radiation efficiency. Finally, we will compare three antennas, and develop procedure with industrial view, and propose the prospect of the GSM/GPRS antenna in PND, as a conclusion.

在第二章中，我们使用单极天线设计概念，使用双路径架构并於末端耦合来对天线阻抗做匹配，产生涵盖GSM900/DCS/PCS/UMTS四频操作频带，并提高与接地面的辐射高度，以避免电容效应，使天线具有良好的辐射特性；在第三章中，使用倒F形天线设计概念，使用双路径架构於末端耦合，并於辐射臂上采取适当接地点电感效应作输入阻抗匹配，达成涵盖GSM900/DCS/PCS/UMTS系统的四个操作频带；在第四章中，采用倒F形架构并使用耦合馈入方式，使得长辐射金属臂在低频900 MHz附近产生共振，产生低频基频模态及高阶模态，以达成宽频及频宽涵盖GSM900/DCS/PCS/UMTS频带操作，并有效缩减使用体积；最后，分别比较此三种架构的优缺点，再加以业界角度来思考，研发产品天线的流程及思考方向，以及天线应用於可携式导航装置中未来的展望作为本论文的总结。

It is concluded that the ultrafiltration preconcentration combining with multieffect evaporation is a promising concentration procedure for straw black liquor, which can not only reduce the concentration costs, but also improve the subsequent evaporation and combustion operation due to the desilicification and purification of ultrafiltration.

两种膜比较，磺化聚砜膜更易清洗，而且水通量大。5）超滤浓缩后，黑液中木素的浓度和纯度大大提高，超滤是从黑液中分离木素的理想方法。6）与多效蒸发相比，用超滤法浓缩麦草黑液可降低能耗70~85%，若用于黑液的预浓缩，再结合多效蒸发，不仅可以降低黑液的浓缩费用，而且由于除硅和纯化作用，会大大改善后继的蒸发和燃烧的操作。

The chemical weathering index, K/Na ratio, eluvial coefficientand A-CN-K diagram , can availably indicate the evolution of pedogenic environment. The A-CN-K and CIA-K/Na diagram showed that the Holocene paleosol was in the primary stage of weathering, which K-feldspar went through weak weathering and K was less leached with much leach of Ca and Na. The intensity of weathering went stronger gradually from west to east in the Weihe Valley.

对化学风化指数、K/Na比值、残积系数等化学综合参数的研究结果显示，各项地球化学参数可有效指示成壤环境与成壤强度；从A-CN-K风化趋势图和CIA-K/Na比较图中可知，渭河流域三个剖面风化程度最高的全新世古土壤基本处于同一风化阶段，即脱Ca、Na，尚未到达脱K的阶段，还是风化较弱的初级阶段，但三者的风化程度是存在差异的，风化程度XJN剖面最低，JYC-N剖面最高，ETC剖面介于其中，说明渭河流域自西北向东南风化程度逐渐增强。

Roughness, surface crust, erodible fraction, stubble and time of efficacy are the indicators for appraisal. Results show that herd grazing has worst effects on soils; plowing is positive to the soils with lower erodibility and negative to sandy soils.(4) Prediction and control of wind erosion are the end of research. Two famous prediction models WEQ and WEPS were briefly introduced. On the basis of summarizing general theory and methodology for wind erosion control, some key measures are suggested for the region of Ningxia.

评价结果显示秋季耕作、春季耕作、火烧、放牧等活动使农田表层土壤风蚀加剧；（4）首先介绍了美国风蚀预测模型，在比较全面地总结前人研究的基础上，本文概括了防治风蚀的一般原理与方法，针对宁夏地区，除了改进土地利用方式外，注意可风蚀性不同的土壤应采取不同的措施。

The results indicate that Ca(superscript 2+) and GA3, single or combined application treatments, promote cucumber seed germination treated with P. harmala alkaloid, increase germination rate, germination vigor and index; as well as α-amylase, protease, lipase, isocitratelyase, nicotinamide adenine dinucleotide kinase and Ca(superscript 2+)-ATPase activities; and GA and CaM content in cucumber seeds; but decrease abscisic acid content. The synergistic effects of combined Ca(superscript 2+) and GA3 on increasing GA and decreasing ABA are oberseved compared with Ca(superscript 2+) treatment.

结果表明，Ca(上标 2+)和GA3单一及复合处理可促进骆驼蓬生物碱处理的黄瓜种子的萌发，使黄瓜萌发率、发芽指数和活力指数提高，萌发种子的α-淀粉酶、蛋白酶、脂肪酶和异柠檬酸裂解酶活性及赤霉素和钙调素含量增加，烟酰胺腺嘌呤二核苷酸激酶和Ca(上标 2+)-ATP酶活性增强，脱落酸含量降低；且Ca(上标 2+)和GA3复合处理对GA含量的提高和ABA含量的降低与Ca(上标 2+)单一处理比较呈显著的加成作用。

Application of organic fertilizer decreased the proportion of total hydrolyzable N fraction and hydrolyzable NH4-N fraction, and increased the proportion of nonhydrolyzable N fraction and unidentified hydrolyzable N fraction, respectively.

比较有机区与惯行区，显示施有机肥料会使可水解全氮所占比例下降，而不可水解氮的比例上升，水解性铵态氮的比例下降，不可辨认的水解性氮所占比例增加。显示所施入之有机肥主要补充至不可水解氮、不可辨认的水解性氮划份。

According to the study result of species selection,12 species of Eucaly-ptus and Acacia were introduced in 1993 in Yuanmou of Yunnan Province Through observing and analysing for more than 2 years and comparing the adaptability and rapidly-growing ability with Leucaena lecocephala introduced successfully before the authors found that Eucalyptus camaldulensis,A auriculiformis ,A caciamangium were the optimal afforestation species in dry-hot river valley of Yuamou This had certain significance to guide...

根据树种选择研究结果，1993年在云南元谋引种桉属和金合欢属树种12个，经两年多的初步观测分析，并与原引种成功的新银合欢比较适应性和速生性，认为赤桉、大叶相思、马占相思可作为元谋干热河谷造林的最优树种，逐步扩大栽培试验，对当地植被恢复适生树种的使用具有一定指导意义。

Through the comparison of calculation results of two methods in the uniform and the non-uniform inflow, it is found that the results by two methods are very close. The calculation results by two methods are compared with open water test, and the agreement is well. The two methods can both perfectly simulate the hydrodynamics performance of podded propeller, and the method of induced potential needs less program work and can save a great deal of calculation time and memory space. It is a simpler and effective method to calculate hydrodynamics performance of podded propellers and other combined propulsions.

经过用两种方法对均匀来流和非均匀来流条件下水动力性能的计算比较，发现两种方法的计算结果很接近，并与模型试验结果吻合得很好，但用诱导速度势的方法编程工作量较诱导速度方法少，而且还可节省大量的计算时间和存储空间，是一种计算吊舱推进器和其他组合推进器水动力性能相对简单而且有效的方法。

Can develop theory to be in just about continuously " environmental crisis " become minatory mankind to live, the direct element that restricts economic progress and influence society stability, the mankind begins to ponder over the relation of person and environment seriously eventually, after having soberer knowledge to a variety of traditional corrupt practice that develop way, put forward.

可持续发展理论正是在&环境危机&成为威胁人类生存、制约经济发展和影响社会稳定的直接因素，人类终于开始认真思考人与环境的关系，对传统的发展方式的种种弊端有了比较清醒的认识后提出来的。

First, the geometry optimization for 1-phenyldibenzophosphole and triphenylphosphine were carried out using quantum chemical AM1 method.

用量子化学AM1方法优化了1-苯基二苯并膦和三苯基膦的几何构型，比较了两种化合物的电子结构和空间结构，发现PDBP作为羰基合成铑膦催化剂的配体要优于三苯基膦；系统研究了PDBP的合成方法，其最佳合成条件为：在无水无氧的条件下，采用二乙胺锂与溴化四苯基膦摩尔比为3，反应温度为22 ℃，反应5 h，反应后酸化， pH值为1～2，产物收率可达到85％～88％。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失