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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。

The structures and stabilities of the ground-states for Cu13-nAgn clusters have been studied by Gupta model potential based on tight binding second moment approximation in combination with a genetic algorithm. It is found that the lowest energy structures of the pure clusters (n=0,13) are perfect icosahedron, and the structures for the bimetallic clusters (n=1~10) have stable structure which are slightly deformed with respect to the perfect icosahedron, The Cu atom prefers to occupy the center of the clusters with higher coordination numbers.

在混合团簇基态结构优化的遗传算法方案中增加了交换算子,结合Gupta紧束缚模型势研究了Cu13-nAgn团簇的最低能量结构,选择合适的交换和杂交概率,可有效地提高优化效率,优化结果表明,Cu13和Ag13是全对称的二十面体,n=1~10的混合团簇能形成稳定结构,其构型是在二十面体基础上发生畸变,Cu原子趋于处在团簇中心,随着Ag原子数目的增加,原子间的平均距离单调增加,团簇的结合能单调减小,Cu2Ag12和CuAg12只存在亚稳结构。

At the angle of operation and under the conditions of regional space, eco-industrial parks could be easily brought into regional by-product networks. Meanwhile, some disadvantages as the lack of flexibility, too small influence scope and restricted operations, etc could be avoided, and the shortcomings of regional by-products operating network such as inadequateness of inventory list and loosely transaction occurrences would be reduced as well. Finally, the idea of circular economy mode and the strategy of sustainable development could be put into effect from part to whole.

在经济技术和地域空间上生态工业园区和副产品交换网络更易于融为一体,还可弥补和消除生态工业园区在发展过程中的柔性不足、影响范围过小和运行限制较多等弱点,克服区域副产品交换网络运行中的产品种类稀少、交易关系松散等劣势,有利于可持续发展由点到面地推进。

Under this model,"by-product" or "rejectamenta" of one produces process may be the raw material of another process. So that the resources of the entire industrial system comes to be a closed-loop circle. By this way, we can well protect the environment while enhancing the economic welfare.

所谓工业共生,在某种程度上可简单地理解为就是企业间副产品的交换,即一组企业寻求利用彼此的副产品,而不是将其作为废物处理掉:这样使整个工业体系转变成各种资源循环流动的闭环系统,做到经济、社会、环境的和谐发展。

With the help of its structure, this paper points out that the non-commutative finite solvable subsimple group will necessarily be a qualitative element group. And referring to the nature of qualitative element group, it can be easily identified the conditions that the ordered prime divisors in a solvable initial finite subsimple group should meet. Suppose that G is always a finite group.

利用其结构,指出了非交换可解有限次单群必为质元群,从而利用质元群的性质,可以很容易地初步确定了可解有限次单群的阶中素因子之间所必须满足的条件,主要得到下面的一些结论:定理1 G是非交换的可解有限次单群,则G′是G的唯一的非平凡正规子群,并且G′是初等交换p -群,此时| G |= p~n q,|G′|=p~n,。

More generally, if it admits an r-parameter volume-presenving commutable symmetry, then the reduced flow preserves the corresponding -dimensional volume form.

更一般地,在n维流形上,具有r个可交换保积对称的保积流能够约化为维商空间上的保积流。

The invention is to control transmission ratio of a continuously variable hydrostatic transmission including an input shaft, an output shaft, a hydraulic pump unit driven by the input shaft, a grounded hydraulic motor unit, and a wedge-shaped swashplate drivingly, pivotally connected to the output shaft and positioned to accommodate pumped hydraulic fluid exchanges between the pump and motor units.

为了控制一可连续地变化的静液传动装置的传动比,该传动装置包括一输入轴(14)、一输出轴(16)、由输入轴(14)驱动的一液压泵装置(18)、被固定的一液压马达装置(20)、和一楔形斜盘(22),其被可驱动地转动连接到输出轴(16)上并且被定位成在泵和马达装置(18,20)之间容纳泵送的液压流体交换。

The next year I did better still, for I spaded up all the land which I required, about a third of an acre, and I learned from the experience of both years, not being in the least awed by many celebrated works on husbandry, Arthur Young (10) among the rest, that if one would live simply and eat only the crop which he raised, and raise no more than he ate, and not exchange it for an insufficient quantity of more luxurious and expensive things, he would need to cultivate only a few rods of ground, and that it would be cheaper to spade up that than to use oxen to plow it, and to select a fresh spot from time to time than to manure the old, and he could do all his necessary farm work as it were with his left hand at odd hours in the summer; and thus he would not be tied to an ox, or horse, or cow, or pig, as at present.

第二年,我就干得更好了,因为我把总需要量的全部土地统统种上了,只不过一英亩的三分之一,从这两年的经验中,我发现了我没有给那些农业巨著吓倒,包括亚瑟·扬的著作在内。我发现一个人如果要简单地生活,只吃他自己收获的粮食,而且并不耕种得超过他的需要,也不无餍足地交换更奢侈、更昂贵的物品,那末他只要耕几平方杆的地就够了:用铲子比用牛耕又便宜得多;每次可更换一块新地,以免给旧地不断地施肥,而一切农场上的必要劳动,只要他夏天有空闲的时候略略做一做就够了;这样他就不会像日前的人们那样去和一头牛,或马,或母牛,或猪猡,捆绑在一起。

Therelationship between the turbulent kinetic energy and its dissipation rate,whichis widely used to parameterize the dissipation rate in turbulence closure models,is found to hold well for both reversing and rotating flows,but with differentcoefficients.Microstructure profiling measurements at two comparative stations (a deepercentral basin and a local shelf break) in the stratified Yellow Sea are analyzed,with emphasis on tidal and internal-wave induced turbulence near the bottomand in the pyenocline.The water column has a distinct three-layer thermohaline structure,consisting of weakly stratified surface and bottom boundary layers anda narrow sharp pycnocline.Turbulence in the surface layer is controlled by thediurnal cycle of buoyancy flux and wind forcing at the sea surface.while thebottom stress induced by barotropic tidal eurrents dominates turbulence in thebottom boundary layer.The maximum level at which the tidally enhanced mixingcan affect generally depends on the magnitude of the tidal current,and it canbe up to 10-15 m in the Yellow Sea.This suggests that,in the deeper regionsof the shelf seas,turbulent dissipation and mixing are very weak at the levelsbetween the near-bottom tidally enhanced layer and the pycnocline.Therefore,these levels provide a significant bottle neck for the vertical exchanges.In theshallow regions,however,the tidally-induced turbulence can occupy the wholewater colum below the pycnocline.A quarter-diurnal periodicities of the turbulentdissipation rate and eddy diffusivity are found at different heights with evidenttime lag.In the relatively flat central basin,the pycnocline is essentially non-turbulent and internal-wave activity is very weak.Therefore,vertical fluxes acrossthe pycnocline decreased to molecular levels.In contrast,internal waves of variousperiods can be always found near the local shelf break.

对强层化季节黄海两对比性站位(分别位于中央海盆区与局地陆坡区)处层化、内波以及湍流混合特征的研究结果表明:1、强层化季节的陆架海水体一般呈现显著的三层热盐结构,在水体近乎混合均匀的上混合层与潮流底边界层之间为强跃层;2、近表层水体的湍流混合强度主要由海表浮力通量的日变化与海表风强迫控制,而在潮流底边界层内,潮混合是水体热量、物质、动量与能量垂直交换的主要机制;3、潮混合影响的深度由潮流大小决定,在黄海,一般可达10-15 m,因此,在水深较深的区域,在跃层与潮混合所至深度范围的上界之间存在湍流混合非常弱的区域,这显著抑制水体内物质的垂直通量,为物质垂直交换的瓶颈,而在水深较浅的区域,潮混合影响范围可至跃层底部,因此物质在跃层以下整个水体中混合非常均匀,当跃层内间歇性强混合发生时,可以产生显著的跨跃层物质输运;4、近底潮致强湍流耗散缓慢地向上传播,底上不同深度处垂直湍扩散系数也具有显著的位相差异,且二者均随时间呈现四分之一周日周期的变化;5、在地形较为平坦的中央海盆区,内波活动非常微弱,因此跃层内湍流混合非常弱,垂直扩散系数为分子扩散水平,跨跃层物质通量受到显著抑制,而在地形变化较为显著的局地陆坡区,内波活动非常活跃,除内潮的影响外,高频内波与内孤立波的影响也很显著,因此跃层内存在很强的间歇性强混合,内孤立波存在的区域,水体湍流混合显著增强。

Strong alkaline PS resin is first turned to the form of Cu-CL complex ions, and then free and complex cyanides in effluent could be removed effectively through ion exchanger and co- mplexation, with a result of CN~- content in effluent.5mg/L and Cu~(2+)mg/L, which conform to the requirements of discharge regulations.

将通常的苯乙烯强碱树脂先转变成铜氯络离子形态,利用离子交换和络合反应可有效地去除废水中游离的和络合的氰化物,使处理后的废水中氰离子含量小于O.5mg/L,铜离子含量小于1mg/L,达到了排放要求。

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This one mode pays close attention to network credence foundation of the businessman very much.

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