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From the angle of a beam-forming, the cross- range focusing principle of the synthetic-aperture radar based on nonsinusoidal waves is studied. The expressions of antenna pattern for both rectangular signa l and Gaussian signal are presented. Compared with the conventional narrow bandw idth SAR whose cross-rang resolution is determined by the carrier frequency, th e cross-range resolution of the nonsinusoidal SAR is affected by the signal ban dwidth.

为研究非正弦波SAR的方位向分辨力，从波束形成的角度分析了非正弦波SAR的方位向聚焦原理，导出了基于矩形脉冲和高斯脉冲的合成孔径天线阵列方向图表达式，并与常规窄带SAR进行比较，指出影响非正弦波SAR方位向分辨力的主要因素为合成孔径长度和信号带宽，而与信号载频无关。

Therefore, the uplink cross-pol interference that we meet is normally caused by the polarization angle mismatch of ground transmitting antennas, or serious overdriven of the uplink power at cross-polarization. And the downlink cross-pol interference is normally caused by the polarization angle mismatch of ground receiving antennas.

因此，常见的反极化干扰通常为，因反极化地面发送天线的极化角失配、或因反极化载波的上行功率严重超标而产生的上行反极化干扰，以及因地面接收天线的极化角失配而产生的下行反极化干扰。

We calculate its radialization correction and make the correlative discussion,obtain the cross section of electron-antielectron collision under chain approximation,and compare the tree-level cross section with the cross section under chain approximation.

对其辐射修正作了相关的计算和讨论，从而得到了电子-正电子碰撞在链近似下的散射截面，并与最低阶的散射截面作了比较

The results showed that there were differences among treatments in transformation of high quality gene(Glu\|D 1 5+10) in F 1 grains, and heterozygous type was more frequently appeared in the treatment of irradiation. In the F 2 segregative population, heading date deviated to early\|mature parent in the treatment of reciperocal cross and its combination with irradiation, indicating that cytoplasm and irradiation could promote the heading. In F 3 the expressive frequency of (5+10) gene in the cross was lower than that in reciperocal cross, and irradiation treatment could raise the expressive frequency of(5+10) gene. These results showed varience in different crosses.

结果表明，不同组合处理间F1籽粒优质亚基(Glu D15+1 0 )的转化存在差异，辐射处理的多以杂合型出现。F2 分离群体中，反交及反交结合辐射处理的抽穗期明显倾向于早熟的亲本，细胞质与辐射具有促进抽穗期的作用。F3 植株Glu D15+1 0亚基的表达频率，不论是哪种组合，反交时 5+1 0亚基的表达频率高于正交；无论正交还是反交，辐射处理提高了 5+1 0亚基的表达频率，而且在不同组合间存在差异。

Cross Stitch Tennessee Volunteers Cross Stitch Design Tennis Needlework Terrance Nolan Cross Stitch ...

交叉缝合田纳西志愿者交叉缝设计网球needlework顿诺兰交叉缝合。。。

The cold Australia land always corresponds to strong Australian High or frequent cold air activities,which is favorable to the formation of strong cross-equatorial flow;The cold underlaying surface to the south of channel always corresponds to weak Walker circulation,which is also favorable to the formation of strong cross-equatorial flow;The warm Indo-China peninsula and cold South China Sea,as well as the strong heat source near the Philippines,all can correspond to strong convergence zone in north hemisphere,which is favorable to the formation of strong cross-equatorial flow.

冷澳洲大陆通常对应强澳高或频繁冷空气活动，其有利于强越赤道气流的形成；通道南部下垫面偏冷通常对应弱Walker环流，其有利于强越赤道气流的形成；偏暖中南半岛下垫面—偏冷南海下垫面、菲律宾附近强热源多对应北半球较强辐合带，它们都有利于强越赤道气流的形成；弱越赤道气流对应的强迫因子及环流因子的特征则与上述相反。

The GCA and SCA between various parents and cross combinations were significantly different. The GCA effect value of 582 was the highest in these three traits. The sum of breeding value and SCA of cross combination 582×Kangda was significantly superior to other combinations in amount of cocoon crop and cocooning rate to newly hatched larvae. The best cross combination of breeding value and SCA was 582×9906 in thousand-cocoon weight.

供试亲本间及各组合间的GCA和SCA差异较大，其中亲本材料582的产茧量、千粒茧质量及收蚁结茧率3个性状均表现出最高的GCA效应值；杂交组合582×抗大的产茧量和收蚁结茧率的育种值与SCA之和明显地优于其他组合，千粒茧质量的育种值与SCA之和最优的组合为582×9906。

Cross-stitch everyone can do indeed is the simple life art, because it has a fixed cross-stitch design and color, even if you have never touched a needle, also do not know to color painting, or too sensitive, so the method can easily master embroiders, embroidered work, it is the charm of cross-stitch.

十字绣的确是人人都可以做的简单生活艺术品，因为它有固定的十字绣图案和颜色，即便你从来没有碰过针线，也不懂得画画，或对颜色不太敏感，照样能轻松掌握绣的方法，绣出自己的作品，这就是十字绣的魅力所在。

PAA/PVA IPN hydrogels were prepared by a sequential method by which acrylic acid firstly. polymerizes and cross-links in PVA/water solution with UV irradiation,then PVA physical cross-linked hydrogels are formed in cross-linked PAA networksby freezing-thawing. The orthogonal test design method was used to optimize theexperimental conditions based on the mechanical and swelling properties of thehydrogels. The effect of the PAA and crosslinking agent contents on the microscopicmorphology of the PAA/PVA IPN xerogel was investigated by transmission electronmicroscopy, and on the mechanical properties of the hydogels was studied bymeasurements of mechanical properties.

针对水凝胶强度、生物相容性和刺激响应性的需要，选择了以PVA和PAA为复合水凝胶的基本分子结构；采用顺序IPN方法制备PAA／PVA IPN水凝胶，即将单体丙烯酸与PVA溶液共混，AA经紫外光辐射聚合交联在PVA溶液中形成PAA化学交联网络，再经冰冻—解冻循环过程在PAA网络内形成PVA物理交联网络。

Cross Stitch Kits And Cross Stitch Books Help You To Learn The Art Of Cross ...

跨缝包和交叉缝合的书籍，帮助你学习艺术的跨。。。

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。