下代
- 与 下代 相关的网络例句 [注:此内容来源于网络,仅供参考]
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All fabrics in the ULTIMATE range perform to over 150,000 Martindale cycles with woolen abradant at 12KPa weight and have exceptional colour retention to laundering and bleaching, offering the durability that CORDURA brand fabrics are recognised for.
科尔迪尤拉品牌面料与羊毛在12KPa重压摩擦下超过150,000马丁代尔周期确认在最终执行范围内的所有面料与羊毛在12千帕的重压摩擦下,在超过150,000马丁代尔周期内,不管是洗涤还是漂白的情况下都将保留着原有色彩,并且更加摩擦耐用。
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In this paper, an iterative approach to potential field continuation from curved surface to plane is proposed. The continuation of potential field data from a curved surface to a plane can be viewed as an inverse problem of upward continuation of plane potential field data, getting a linear integral equation. Through viewing the potential field data on the curved surface as the data on the average elevation plane of the curved surface, then using the wavenumber domain generalized inverse algorithm to downward continue the data from the average elevation plane to a given plane, and a topography correction based on the change of curved surface relative to its average elevation is implemented to the downward continued data on the given plane, finally the downward continued data plane is upward continued to the curved surface.
本文提出一种位场数据曲化平的迭代方法,即通过把位场数据曲化平视为平面位场数据向上延拓的反问题,得到曲化平的线性积分方程,再把曲面上位场数据视为曲面平均高程面上的位场数据,利用向下延拓的波数域广义逆算法把平均高程面上的位场数据向下延拓到设定平面上,再根据曲面和其平均高程面的相对起伏对设定平面上的向下延拓数据进行起伏校正,最后再把所得平面上的位场数据向上延拓得到曲面上的位场数据,并进行迭代。
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Firstly, the principle of the iteration method is presented, the characteristic of the method is analyzed. The downward continuation computation for model and practical data with noise of different variance is performed by means of iteration method.
首先介绍了迭代法的基本原理,分析迭代法的特点;然后利用迭代法对不同噪声水平的模型数据和实测数据进行向下延拓计算,研究噪声对迭代法的计算误差影响。
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If the pattern has a low rate of convergence, the time of the human and machines will be wasted and the answer are not surely attainable.So,we must look for the patterns with the high rate of convergence or try to settle some parameters of the iteration patterns (for instance the overrelaxation parameter of SOR iterative method).
本文第二章针对AOR迭代法考察了当线性方程组的系数矩阵A为(1,1)相容次序矩阵且其Jacobi特征值为纯虚数或零时的迭代收敛范围,最优参数(即最优松弛因子和最优加速因子)及与之相应的谱半径,并将此最优谱半径与相应的SOR的进行比较,定量的给出在不同条件下,AOR和SOR迭代法各有其优越性,从而圆满的解决了在这两种迭代法之间如何适当的选择最佳迭代法的问题。
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Analysis of the material change, garlic cells bioactive aliphatic thio cysteine sulfoxide and thiosulfate propenyl cysteine sulfoxide sulfur compounds in garlic, such as the role of enzymes, the generation of thiobarbituric acid sub - ester, propylene-based thiosulfinates, allyl thiosulfinates as garlic pigment precursor substances, and further changes occurred in the green garlic.
从物质变化分析,大蒜细胞中的生物活性物质硫代脂肪族半胱氨酸亚砜和硫代丙烯基半胱氨酸亚砜等含硫化合物在蒜酶的作用下,生成硫代亚磺酸酯、丙烯基硫代亚磺酸酯、烯丙基硫代亚磺酸酯,作为大蒜色素物质的前体,进一步发生大蒜绿变。
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The chapter two was focused on the samarium diiodide promoted organic reactions and their applications in organic synthesis, firstly, a new synthesis of highly substituted cyclopentadienes from a,β-alkynone promoted by samarium diiodide was investigated and the highly substituted cyclopentadienes were prepared in moderate to good yields under mild conditions. Secondly, the Michael addition and Michael-aldol tandem reaction of diorganyl diselenides or diorganyl disulfides with α,β-alkynones mediated by samarium diiodide were studied and a series of alkenylsulfides and alkenylselenides were prepared in good yields. Then the highly regioselecfive nucleophilic addition of the allylsamarium bromide to α,β-alkynones were explored. We found that the allylsamarium bromide reacts with α,β-alkynones to afford regiospecificly 1. 2-nucleophilic addition products in good yields under mild condition. At last we studied the coupling reaction of aryl halides promoted by NiCl〓/PPh〓/Sm〓.
第二章 研究了二碘化钐、金属钐促进的有机反应:1、二碘化钐促进下α,β-炔基酮的偶联环化反应,提供了一种制备多取代环戊二烯的新方法;2、二碘化钐促进下的二硫醚、二硒醚与α,β-炔基酮的Michael加成反应,为高产率地制备多取代的烯基硫或烯基硒化合物提供了方便可靠的新方法;3、二碘化钐促进下的二硫醚、二硒醚与α,β-炔基酮和醛、酮的Michael—aldol串联反应,提供了一种一锅法高产率地制备多取代的含硫的烯丙基醇或含硒的烯丙基醇类化合物的方便可靠的原子经济性的新方法;4、烯丙基溴化钐与α,β-炔基酮的高度区域选择性的1,2-亲核加成反应;5、NiCl〓/PPh〓/Sm〓促进的卤代芳烃的偶联反应-一种从各种卤代芳烃制备联苯类化合物的有效方法。
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In order to investigate the mechanism for this reac-tion, methyl α-bromoacetate or ethyl α-bromoacetate as starting material was added to the solution of phenyl selenoamide in ethanol in 1∶1 or 2∶1 molar ratio under the neutral condition at room temperature. The results indicated that the same product bis or bis diselenide was formed. Byproduct ethyl benzoate was also separated.
为了研究该反应机理,选择α-溴代乙酸甲酯或α-溴代乙酸乙酯在无催化剂、中性条件下,乙醇溶液中与苯基硒代酰胺室温下反应,投料比为1∶1和2∶1,结果也都生成了同一类产物二甲氧羰基甲基二硒醚或二乙氧羰基甲基二硒醚,同时还分离得到了相应的副产物苯甲酸乙酯。
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In order to investigate the mechanism for this reaction, methyl α-bromoacetate or ethyl α-bromoacetate as starting material was added to the solution of phenyl selenoamide in ethanol in 1:1 or 2:1 molar ratio under the neutral condition at room temperature. The results indicated that the same product bis or bis diselenide was formed. Byproduct ethyl benzoate was also separated.
为了研究该反应机理,选择α-溴代乙酸甲酯或α-溴代乙酸乙酯在无催化剂、中性条件下,乙醇溶液中与苯基硒代酰胺室温下反应,投料比为1:1和2:1,结果也都生成了同一类产物二甲氧羰基甲基二硒醚或二乙氧羰基甲基二硒醚,同时还分离得到了相应的副产物苯甲酸乙酯。
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In each case, we perform the Metropolis–Hasting's algorithm see
在每种情况下,我们完成了Metropolis-Hasting的算法参见[12、13]的使用服从对数正态分布的提案的参数来模拟随机变量序列的迭代离开10第1000迭代,然后选择一个采样点在每100个迭代来减少迭代关系样品。
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The downward continuations are made by the iteration method and the FFT for a model and practical data, respectively. The effect of the iteration method is much better than the FFT.
本文用迭代法对模型数据和实际数据进行向下延拓,对比了迭代法与常规的FFT法在位场向下延拓中的效果,迭代法显著优于FFT法。
- 推荐网络例句
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On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.
另一方面,更重要的是由于城市住房是一种异质性产品。
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Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.
气候直方图是将所收集的降水量测定值,分为几个相等的区间作为横轴,并将各区间内所测定值依所出现的次数累积而成的面积,用柱子排起来的图形,也叫做柱状图。
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You rap, you know we are not so good at rapping, huh?
你唱吧,你也知道我们并不那么擅长说唱,对吧?