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This problem dates back to 1611, when Johannes Kepler conjectured that the best packing arrangement for identical spheres was arranging them in what is now called face centered cubic packing - similar to how one sees cannon balls stacked.

这个问题可追溯到1611年约翰尼斯·开普勒提出堆积等大球体最佳方法的猜想(译者注:当等大球体按照--球心位于正方体各面的中心上--的形式,并且将第一层摆放成六角形时,它们占用的空间最小,对空间的利用率可以超过74%),现在把这个方法叫做面心立体堆积法--类似于加农炮弹的堆积方式。1998年,安娜堡密西根大学教授托马斯·C·黑尔斯证明了这个猜想。

There are two types of coal formation: a local land accumulation in which the original substance of rotten plant material congregates in a peat bog where plants are growing; b distant land accumulation in which the original substance, which is from nearby areas or somewhere distant, of rotten plant coal congregates in a fresh water basin, lagoon, delta or lake through movements.

成煤原始物质的堆积方式分为2大类型:原地堆积——腐植煤的原始物质聚集在泥炭沼泽中植物自身繁殖的地方;异地堆积——腐植煤的原始物质是从相邻地区或大陆更远的一些地段,经过搬运,聚集在淡水盆地、泻湖、三角洲、湖泊之中。

Pompe's disease is a rare hereditary condition that causes an enzyme deficiency, which in turn leads to the buildup of glycogen, a stored form of sugar used for energy. The glycogen buildup causes progressive muscle weakness throughout the body, particularly in the heart, skeletal muscles, liver, and nervous system. In extreme cases, children can also die of heart failure.

庞贝氏症是一种遗传的罕见疾病,因为缺乏体内的酵素,导致肝醣无法分解堆积,因肝醣无法分解堆积造成心脏肥大、肌肉无力,肝脏和神经系统衰弱,在ㄧ些更极端的病例中,最后就因为心脏衰竭死亡。

In this paper, the optimization model of grain composition is presented first on the background of how to select the reasonable grain composition for producing the unshaped refractory in a factory and to combine the conditions of the factory with the theory of packing in compression and craft requests.

此文首先以不定型耐火材料生产中如何选取合理颗粒级配为背景,把紧密堆积理论与实际生产条件及工艺要求相结合,建立了堆积颗粒系统中颗粒级配的优化模型。

The lithologic characters changed from fluviolacustrine sandstone to aeolian Red Clay with thin interval of greyish-white sand layers at the depth of 602 m. It can be inferred from the rock strata and age that the development age of aeolian sequence in Lanzhou area was 7 Ma at least, which is in accordance with the bottom age (7~8 Ma) of the aeolian sequence of the eastern and central Loess Plateau, suggesting that their accumulation processes are unitary.

皋兰山剖面深度602 m处出现由河湖相砂岩向以风成红粘土为主常夹有薄层砂岩的地层转变,通过岩性地层及年代的推断,兰州地区的风尘序列堆积发育的年代至少为7 Ma,与黄土高原风尘序列堆积底界8~7 Ma基本一致,说明了兰州地区与黄土高原在风尘序列堆积过程中具有统一性。

Furthermore, the one-dimensional complexes 26 and 28 with strongπ-πpacking interactions are prepared from DMF solvent, which indicates that the traditional solvent volatilizing method could bring low-dimensional complex.4. By measuring the enthalpy changes of the liquid phase formation reaction for complexes a~e, and calculating the electronic densities of five 5-substituted derivation of isophthalic acid, we can make a conclusion that 5-substituted group changing of the ligand has a little influence on oxygen atoms of carboxyl groups.5. Fluorescence experiments of these complexes indicated that they could be used for luminescence materials in future.6. Using packing saturation rule we calculated and analyzed these series of complexes, and the results showed that the changes of complexes with changes of ligands could be explained from the rule.

在DMF溶剂中得到了具有强π-π堆积作用力的一维配位聚合物[Ln(5-NO_2-bdc)(NO_3)]Ln=Pr(26和Ho(28),表明传统的溶剂挥发合成条件可以得到低维的配合物。4、通过配合物a~e的液相生成反应焓的测定,以及配体阳离子的电子密度计算,进一步佐证了间苯二甲酸的5位取代基变化对配体的羧基氧原子配位能力影响不大的结论。5、荧光特性表明此类配合物可以用于发光材料。6、利用堆积饱和规律对所得系列的配合物的进行计算和分析,发现随着配体的变化,配合物的变化可以从堆积饱和规律出发进行解释。

Instead of bunching around the buttocks or amassing on the arm, extra fat builds in other places, like the liver.

多余的脂肪除了堆积在臀部和胳膊上,还会堆积在其他部位,比如肝脏。

If the volcanic clasts were deposited on volcanic slope and/or fluvial plain, they would occur in the 4 faceis mentioned above or in alluvial fan and braid stream. If the volcanic clasts were deposited in lake, they would occur in delta, fandelta, shallow-deep lake, and swamp.

火山物质堆积在火山斜坡以及前方的冲积平原上,往往以火山碎屑岩相或者冲积扇相、辫状河相保存;它们堆积在湖泊中则为三角洲相、扇三角洲相、较深水相和沼泽相。

It proves that; The grass-covered soil profile in depression is formed by accumulation, and the 137 Cs concentration variation with the depth of the profile reflects the information of sediment accumulation and surface soil erosion.

研究结果表明:(1)草地洼地土壤剖面属于堆积土壤剖面,土壤剖面中137Cs浓度分布特征反映了泥沙堆积与表层土壤侵蚀的信息。

Moreover, numerical experiment is performed to investigate micro-structure of the sand pile.

此外还完成了仿真不均匀颗粒下落堆积过程的虚拟沙堆堆积模拟实验。

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