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We obtain the necessary and sufficient conditions for the commutativity of k~-order slant Toeplitz operators and the compactness of products of such operators, in particular, the commutativity and the essential commutativity of such operators are in accord.

第二章研究了L~2上的k阶斜Toeplitz算子的性质、得到了两个k阶斜Toeplitz算子可交换的充要条件及其乘积和换位子是紧算子的充要条件,特别地,给出了两个k阶斜Toeplitz算子的交换性与本性交换性是一致的。

It is overall a monoclinal structure dipping to south, on which three group faulted structures with the directions of E-W, NEE, and NE-SW are developed, and they are tensional faults. The Orinoco heavy oil belt has been divided into two tectonic zones by one regional fault with the trend of NE in the plane, and the characteristics are different in the two tectonic zones.

奥里诺科重油带是目前世界上唯一一个还基本未开发的大规模重油富集带,它位于东委内瑞拉盆地边缘隆起带,总体是一北倾单斜,其上主要发育E-W向、NEE向和NE-SW向三组断裂,且以张性断裂为主,其中有一条北东向区域性大断裂将奥里诺科重油带在平面上划分为两大构造区,其各自的构造特征不同。

Changbei gas field is a river lothology-stratigraphic trap gas pool on the west trend monocline background, it is located in the east of the basin, it has thin bed, low-porosity, low-permeability, low-pressure, low-deliverability character and develop difficulty(HeGuang-huai, 2002), especially to develop this thin bed and unhomogeneity seriously river sandbody gas pool is much difficulty.

长北气田位于盆地东部,属于西倾单斜构造背景上的河道岩性-地层圈闭气藏,具有薄层、低孔、低渗、低压、低产和非均质性强等特点,开发难度大,尤其是利用水平井开发如此薄层的非均质性严重的河道砂岩气藏难度更大。

He also extended quasi-geostrophic non-acceleration theorem to primitive equation non-acceleration theorem.

他在国际上首创湿倾斜涡度发展理论和全型垂直涡度方程,成功地揭示青藏高原西南涡和夏季江淮流域的暴雨发展机理,揭示副热带高压形态变异的成因;证明创新的原始方程中的无加速定理以及大气运动的动力强迫和热力强迫的调配率;开展创新性气候动力研究,揭示中高纬和热带海气相互作用差异的机理及厄尔尼诺影响台风频率的机制,继承和发展了我国学者关于青藏高原对大气环流和天气气候影响的研究;在国际上首次把亚洲季风爆发分为三个阶段,证明由于中高纬度的强地转性和斜压性使其海气相互作用的特征与热带显著不同;首次用数值模式提出厄尔尼诺影响台风的机制,得到国际上的高度评价。

There are two kinds of spinels in a granulite terrain of Yushujgou, South Tianshan Mountain. One occurs in the intermediate and basic granulite units and is characterized by enriched Al and poor Cr, belonging to Al_spinel. In thin sections it shows dark green color and subhedral to anhedral form, and coexists with other metamorphic minerals, suggesting a neogenic metamorphic mineral of granulite facies. The other occurs in the adjacent ultramafic rock unit, belonging to Cr_spinel. In thin sections, it is dark brown in color and is scattered among olivine, clinopyroxene and orthopyroxene as irregular grains, indicating a stable residual mineral in the process of granulite facies metamorphism.

新疆榆树沟麻粒岩地体中发育两类尖晶石:一类见于中、基性麻粒岩体中,其化学成分富 Al贫 Cr ,属铝尖晶石,镜下为深绿色,呈半自形至他形粒状,与其它变质矿物共生,表现为麻粒岩相的新生变质矿物;另一类发育在空间上与麻粒岩体紧密相邻的超镁铁质岩体中,为铬尖晶石,镜下为深褐红色,呈不规则粒状分布于橄榄石、斜方辉石和单斜辉石之间,为麻粒岩相变质过程中稳定的残余矿物。

Methods 23 cases with muscular asthenopia caused by exophona were included in our study. After examination of refraction, phoria, AC/A and fusion function, all cases were given prism correction and fusion training based on refraction correction.

对23例外隐斜导致肌性视力疲劳的患者进行屈光、隐斜、AC/A、融合功能检查后,在屈光矫正基础上应用压贴三棱镜矫正和融合功能训练。

Cases of the ocular torticollis caused by congenital paralysis of superior oblique muscles were analysed.

分析先天性上斜肌麻痹所致的眼性斜颈35例,术前测量第一眼位和头倾向患眼侧时的垂直偏斜度。

Some commonly agreed findings of legibility research include: text set in lower case is more legible than text set all in upper case, presumably because lower case letter structures and word shapes are more distinctive, having greater saliency with the presence of extenders (ascenders, descenders and other projecting parts); regular upright type is found to be more legible that italics, contrast, without dazzling brightness, has also been found to be important, with black on yellow/cream being most effective; positive images are easier to read than negative or reversed; the upper portions of letters play a stonger part than the lower portions in the recognition process; legibility is compromised by letterspacing, word spacing and leading that are too tight or too loose.

在易读性研究方面达成的共识包括:小写字母的文本要比全大写字母的文本易读,大致是由于小写字母的结构和词语形状更容易区分,特征更明显——带有延展性的笔画(ascenders上伸笔画, descenders下伸笔画、以及其他的伸展性笔画部件);标准体字形的易读性要优于斜体;对比很重要——不要用那些耀眼的发光效果;在黄色/奶油色底上使用黑色文字最有效;阳文要比阴文易读;在识别过程中,字母的上部形状要比下部形状发挥更重要的作用;字母间距、词间距和行间距太密集或太松散也会降低易读性。

Some commonly agreed findings of legibility research include: text set in lower case is more legible than text set all in upper case, presumably because lower case letter structures and word shapes are more distinctive, having greater saliency with the presence of extenders (ascenders, descenders and other projecting parts); regular upright type is found to be more legible that italics, contrast, without dazzling brightness, has also been found to be important, with black on yellow/cream being most effective; positive images are easier to read than negative or reversed; the upper portions of letters play a stonger part than the lower portions in the recognition process; legibility is compromised by letterspacing, word spacing and leading that are too tight or too loose.

在易读性研究方面达成的共识包括:小写字母的文本要比全大写字母的文本易读,大致是由于小写字母的结构和词语形状更容易区分,特征更明显——带有延展性的笔画(ascenders上伸笔画, descenders下伸笔画、以及其他的伸展性笔画部件);标准体字形的易读性要优于斜体;对比很重要——不要有那些耀眼的发光效果;在黄色/奶油色底上使用黑色文字最有效;阳文要比阴文易读;在识别过程中,字母的上部形状要比下部形状发挥更重要的作用;字母间距、词间距和行间距太密集或太松散也会降低易读性。

Failure type and behavior under loading (ductility and energy absorption capacity ) have been understood fully through the inv...

并在此基础上提出了劲性钢筋混凝土连梁的正截面和斜截面承载力的计算方法。

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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发,分析对称连杆曲线上鲍尔点的产生条件,提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品,年生产总值3000万美元,产品价廉物美、选料上乘、质量保证,深受国内外客户的青睐

The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.

血精的原因很,以良性病变为主。