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In order to study the aldol condensation of 2.15-hexadecanedione on the surface of aluminium, the intermolecular condensation mechanism of acetone occurring on aluminum was simulated by using semi-empirical AM1 method embodied in MOPAC 6.0 program package. The optimized structures and geometry parameters of 5 transition complexes and 4 intermediates were given.First, 2 molecules of acetone coordinated with aluminum by electrostatic attraction.One atom of hydrogen of acetone migrated to aluminum because of t...
为了研究2,15-十六烷二酮在氧化铝表面的环合机理,选择小分子丙酮为模型化合物,用量子化学半经验AM1方法研究双分子丙酮在氧化铝表面的醛醇缩合机理,给出了反应过程中的5个过渡态和4个中间体的结构和几何参数,该催化反应可以认为是氧化铝分子与两分子丙酮分子发生静电络合作用,然后借助氧原子的负电荷导致脱氢并实现缩合,根据中间体的能量变化,推测有较稳定的铝复合物生成。
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In order to optimize the design of hot blast stove, a model of heat transfer in chamber of hot blast stove was developed and the software based on the model was established. The effect of the checker thermal characteristics such as thermal conductivity, heat capacity, density etc on the temperature of blast and checkers,the heat accumulation and heat release of checkers was determined.
为优化热风炉设计,建立了热风炉蓄热室内传热过程的数学模型,制作了应用程序软件,探讨了不同的格子砖物性参数,如导热系数、比热容和密度等对格子砖温度场分布、气体温度分布以及格子砖蓄热量和放热量的影响。
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In order to study the relationship between vegetable quality and water, nutrition supply, the effects of different water and nutrition supply on the growth of lettuce, melon were investigated, and the effects of grafting on quality of cucumber, melon and watermelon were studied.
根据蔬菜生产实际和消费者对蔬菜营养品质的需求,重点开展了嫁接对瓜类蔬菜品质、不同水肥条件(不同灌溉模式、营养条件)与生菜和甜瓜品质等方面的研究,提出了适合上述蔬菜品质形成的高效水肥调控技术。
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In order to change the situation. SPD innovated the traditional theory which brought a great change in its basic value, In term' of just value, it has changed from distribution to chance ;In terms of welfare, SPD claims an active welfare country which is based on the principle of bearing danger and chance together, enjoying right and obligation together; In terms of social management, SPD insist that it should be changed from nationalism which state is responsible for everything to Civil Society which the civics take on their duties first.
20世纪90年代末期上台执政的德国社会民主党接手的是处于危机边缘的福利国家,为了应对困境,德国社会民主党对传统理论进行了革新,基本价值观念发生了重大转变,在公正观念上,完成了从分配公正向机会公正的转变;在福利观念上,主张以风险和机会共担、权利和义务共享为原则的积极福利观;在社会治理观上,主张从国家作为社会治理的首要实施者的&国家主义&向公民是第一责任人的&公民社会&转变。
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In order to realize the product disassembly planning, the method of judging adjacency point is proposed based on the analysis of disassembly sequence generation. Based on the disassembly logic inference, the combine of Deep-Searching and Wide-Searching, the product disassembly sequence algorithm is generated.
其次,为了实现产品拆卸序列规划,在研究利用产品拆卸约束图生成产品拆卸序列的基础上,根据产品拆卸约束解除的逻辑推理,运用深度优先与广度优先搜索策略,给出目标拆卸序列生成算法,并运用遗传算法对生成的拆卸序列进行优化。
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In order to analyzes the soil deformation mechanism under the impact load of the step-bit, the finite element model of impact and displacement drilling with down the hole hammer is established on the basis of adopting Drucker-Pager yield criterion, taking soil as DP materials and simulating the drilling process by applying the impact load on soils.
为了分析阶梯钻头冲击挤密作用下土体的变形机理,将土体视为DP材料,服从Drucker-Prager屈服准则,通过钻具与土体之间的接触以及施加冲击载荷来模拟钻进过程,建立了潜孔锤冲击挤密钻进的有限元模型。
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1It was discovered just after Darwin release his theory of evolution. It appear so soon that people doubt advents forged this fossil in order to evident Darwin's theory. 2the feather on the limestone of the fossil is so clear and perfectly formed that people doubt it is a artificial one. 3there is a split on the fossil, and the two pieces did not join together tightly.
由 1980s,某知名历史学家提出,原因有三: 1他怀疑这个化石是达尔文伪造的,目的在支持他的&鸟类从爬行动物进化而来&的理论; 2化石的纹理过於清晰,经过千百年历史,鸟的羽毛依然可见,这很不正常; 3化石有两部分组成,然而这两部分不能完整的拼合在一起,可见这是假造。
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In order to develop a new path for gene mapping of fish, the digoxigenin and tritium labeled in situ hybridization techniques combined with multiple banding analysis on the pachytene bivalents of M. albus were studied using the wheat ribosomal RNA genes, pig growth hormone gene and MaSoxl (M. albus SRY boxl) DNA segment as the probes. Moreover, the techniques of random primed in situ DNA synthesis were also developed on the bivalents of M.
以两种异源基因和Ma Soxl为探针,采用地高辛或氟标记的原位杂交技术,结合点渍法和DNA印渍法分析,率先在黄鳝减数分裂二价体上开展基因定位研究,并与多重带带型分析相结合,以期为构建黄鳝染色体框架图奠定初步基础,为迅速改变鱼类基因定位研究的落后局面而开辟新的途径。
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Research methods: Based on the site geological survey information about water bursting of Cangling Tunnel, the concrete analyses are made for the scale, location, causes and geological conditions of water bursting and the explorations are made on the characteristics of composite of surrounding rock, geological structure, modern structural stress field and underwater from the view of geological engineering point in order to seek the regularity of water bursting and better treatment.
研究方法:根据发生突水事故的浙江苍岭隧道的现场地质观测资料,具体分析其形成的规模、位置、诱发因素以及地质条件,从地质工程的角度,对突水发生地段隧道的岩石组成、地质构造、现代构造应力场以及地下水等工程地质特征进行探讨,进而发现其规律和防治预测的特点。
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To these aims, 65 primary school students were divided into two groups by Conners Teacher Rating Scales: behavior disordered and normal students firstly. Secondly , based on the characters scales, we analysed the characters of the initial sandtray of the 65 students. Last used logistic regression on the date of the two ones in order to find the diagnostic characters of behaviors problem children.
为了达到以上研究目的,本研究使用Conners儿童行为量表作为测量工具,将65个小学生被使分为行为问题儿童和正常儿童,再按照研究者在理论和临床经验基础上总结出来的初始沙盘主题特征编码表,对这两组小学生的初始沙盘做编码分析和计分,最后用logistic回归分析找出对行为问题儿童具有诊断意义的沙盘主题特征。
- 推荐网络例句
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For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether
年美国个人破产法的一个改动使得破产登记急速下降,而后引起了信用卡大规模的亏损。
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Eph. 4:23 And that you be renewed in the spirit of your mind
弗四23 而在你们心思的灵里得以更新
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Lao Qiu is the Chairman of China Qiuyang Translation Group and the head master of the Confucius School. He has committed himself to the research and promotion of the classics of China.
老秋先生为中国秋阳翻译集团的董事长和孔子商学院的院长,致力于国学的研究和推广。