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As to the high polarity, high boiling point resultant—trimesic acid, the analysis methods of infrared spetrum, gas chromatography-mass spectroscopy, vapour-phase chromatography, acid number titration and so on are seperately used to characterize its property. Infrared spetrum and gas chromatography-mass spectroscopy are used to have a qualitative analysis on the resultant and are compared with the stand diagram. Sulfuric acid-methanol esterification and rapid esterification are used to prepare the trimesic acid trimethyl-ester and have a FID quantitative analysis. So that we make sure the purity of trimesic acid in the resultant and also we have an acid alkali titration on the resultant to get its acid number, in order to verify the purity of trimesic acid in the resultant.
对于高极性、高沸点的固体产物均苯三甲酸,分别采用红外光谱、气质联用、气相色谱、酸值滴定等分析手段进行了表征:利用红外光谱、气质联用的方法进行产物的定性分析,并与在同一仪器、同一条件下做出的标准谱图进行比对;采用硫酸-甲醇酯化法和快速酯化法制备出均苯三甲酸三甲酯,对其进行气相色谱FID定量分析,进而确定固体产物中均苯三甲酸的纯度;用酸碱滴定法确定固体产物的酸值,以对固体产物中均苯三甲酸的纯度进行验证。
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The PS-b-PNIPAM-b-PDMA and PS-b-PDMA-b- PNIPAM triblock copolymers can self-assemble into PS-core micelles, which possess a three layer \'onion-like\' structure, with PDMA and PNIPAM blocks forming the inner layers or outer coronas. Using above measurements, we can concluded that PS-b-PNIPAM-b-PDMA triblock copolymer micelles have the double phase transition behavior, while PS-b-PDMA-b-PNIPAM have only one phase transition behavior.2. We synthesized poly(ethylene glycol-b-methacrylic acid)diblock copolymers with three different polymerization degree of PMAA blocks.
但是对于PS-b-PDMA-b-PNIPAM胶束,由于中间亲水嵌段的作用,使PNIPAM的相转变温度提高,且PDMA由于靠近PS内核以及随着外壳PNIPAM的水溶性变差其相转变点降低,因此我们只能看到一个转变过程。2、通过原子转移自由基聚合,我们合成了三种不同PtBMA长度的PEG-b-PtBMA二嵌段聚合物,将叔丁基水解后得到了三种PEG-b-PMAA二嵌段聚合物。
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For a series of advantage such as the simple structure, low cost, reliable running convenience maintaining and so on, the capacitor in one-phase motor has already widely applied in home appliances and small power drive.
在当今中国,单相电机的应用特别是在农村中非常之普遍,而中国农村的比重很大,因而对于单相电机的研究很有现实价值。
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For cluster phases, a common model is proposed to express the phase cornpositions, which can be described as formula: phase composition=+.
对于团簇相的成分和结构,可以用模型(相成分=[有效团簇]+)来解释。
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Objective To explore the clinical value in examining morphology of red cell in urine for those enfants with kidney injury by eating melamine contaminated formula.Methods Examined morphology of red cell in 296 urine samples from enfants eating melamine contaminated formula.Gave statistic analysis to 7 key indices.
目的 探讨尿红细胞位相检测对于服食三聚氰胺污染奶粉造成的儿童肾脏损伤诊断的临床意义方法对296例服食三聚氰胺污染奶粉儿童尿液进行红细胞位相检测,分别得出7项指标,结果进行统计分析。
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The fermion environment is considered from zero temperature to the critical temperature. It is show that the decoherence of the two-level system may also act as the witness of the environments phase transitions, which is similar to the relation between quantum phase transitions and decoherence in the former study.
对于一维XY自旋链系统,二粒子系统的纠缠度会在自旋链的量子相变临界点附近发生剧烈的变化,这种剧烈的变化正是量子相变的一种外在体现。
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A new implicit pressure calculation method and relevant percolation rule are introduced taking account of the advantages of methods suggested by King, Sorbie and Stenby. Simulation methods for various boundary conditions (fixed pressure or fixed flow rate) and well pattern (line drive, five-spot pattern) are presented.
多相渗流的随机渗滤多尺度模拟多孔介质的多尺度非均质性及工程上对渗流模拟空间范围的要求,使得多相渗流的多尺度模拟对于正确模拟渗流过程具有十分重要的意义。
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Evidence suggests that 1 under more stable stratification, the basic flow, if moving faster at low and high levels (particularly in the presence of jets there), allows a resulting meso-β unsteady wave to propagate eastward with respect to basic flow and even at greater velocity compared with it; 2 vertical windspeed shear of basic flow causes instabilities of the TWT perturbation; 3 considering the second derivative of basic-flow wind with respect to z (denoted by zz≠ 0 which is simply given as β* hereafter) the expression for the phase velocity of vortex Rossby wave is obtained, which is unidirectional in propagation with respect to basic flow; 4 VRoW has its physical origin from β*, i.e., from z-varying heterogeneities of y-direction averaged vorticity of the basic flow field; 5 VRoW phase velocity is associated with zonal wave number k, its energy is dispersive and the group velocity exists in the x direction; 6 when windspeed meets the condition of β*, TWT disturbance instability may be that of mixed VRoW and gravity wave; 7 if basic flow is subject to linear shear but does not meet the condition of β*, the TWT instability is that of inertia-gravity wave.
在大气层结比较稳定的情况下,如果基本气流在低层和高层较大(有可能存在低空急流和高空急流),此时产生的β中尺度不稳定扰动相对于基流向东传播,甚至于快速向东传播。基本气流在垂直方向上的风速切变对于中尺度横波型的扰动起着不稳定的作用。如果考虑基流的二次切变,可以得到涡旋Rossby波的相速度表达式,涡旋Rossby波相对于基本气流是单向传播的。涡旋Rossby波产生的物理根源是基本流场的风速二次切变,亦即基本流场y方向的平均涡度在空间z方向上的不均匀所致。涡旋Rossby波的相速度与纬向波数也有关,它的能量是频散的,其在纬向x方向也存在群速度。在基本流场的风速存在二次切变时,横波型不稳定可能是混合的涡旋Rossby重力波的不稳定;而在基本流场的风速仅仅存在线性切变,不存在二次切变时,横波型扰动的不稳定则是重力惯性波的不稳定。
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Therefore, the calculated results from two numerical computation codes are in good agreement with those from field theory calculation. It has been proved that the applicability of this approach to mode separation research, by contrast, the tested results of mode frequency coming from the Model 2M214 magnetron (double-ring strappings) manufactured by LG Electronic Co.
对于LG 2M214型双环隔模带磁控管,模式分隔度的分析结果与韩国LG公司生产的磁控管实测结果相比较,预测误差仅为0.6%,能够与实际测试结果很好的相符合,预测精度足够高,从而证实了本方法在磁控管谐振系统模式频率分隔特性预测方面的可用性。
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Open-phase operation in large power unit is very harmful to generator and theoperation of power system. The study on open-phase operation and the analyses ofextracted fault information are of great value to the safety of generator and the operationof power system.
发电机组非全相运行的分析与研究,以及非全相故障信息的提取与判断,对于保护发电机组与系统的运行安全有着非常重要的研究价值。
- 推荐网络例句
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The split between the two groups can hardly be papered over.
这两个团体间的分歧难以掩饰。
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This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.
这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。
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The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.
聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力