共查询到19条相似文献，搜索用时 390 毫秒
1.
马俊林 《十堰职业技术学院学报》1994,(3)
在环管反应器中对高粘度催化剂在液固体系的混合特征进行了研究,探讨了催化剂粘度、循环速率、固含率以及混合雷诺数对混合时间的影响,对混合过程参数进行了准数关联,并建立了混合过程的数学模型,模型值与实验值吻合较好. 相似文献
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马俊林 《十堰职业技术学院学报》1998,(1)
本文研究了在装有静态混合器的环管反应器中高粘度催化剂的混合特征,探讨了在有内构件的情况下循环速率、雷诺数大小以及催化剂粘度对混合时间的影响,说明在环管反应器中使用静态混合器对提高高粘度催化剂的混合效果十分有利. 相似文献
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马俊林 《十堰职业技术学院学报》1996,(2)
在环管反应器中研究了高粘度催化剂的径向浓度分布,探讨了催化剂粘度对径向浓度分布的影响;径向浓度分布的动态变化过程;比较了实验数据对二维扩散模型的符合情况. 相似文献
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张民 《通化师范学院学报》2012,33(10):20-21
测定了催化水合制乙二醇工艺中NY3催化剂在二甘醇、乙二醇、甘油以及乙二醇与甘油混合溶剂中的溶解度.探讨了上述饱和溶液的粘度随温度的变化关系.实验结果表明:催化剂NY3在甘油中的溶解度最大,NY3较适宜的溶剂为30%乙二醇与70%甘油组成的混合溶剂. 相似文献
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石玉冰 《濮阳职业技术学院学报》2011,24(3)
本文在Teju-Rice粘度模型的基础上,研究了非电解质水溶液二元交互作用参数的关联方法,导出了具有预测特性适用于非电解质水溶液的粘度模型。利用该模型方程可由各组分物性预测低压下各种温度和不同组成的非电解质水溶液的粘度。用该模型计算了6个体系346个数据点的不同温度和组成的二元水溶液、3个体系164个数据点的不同温度和组成的三元水溶液的粘度,计算值与实验值的总平均相对偏差分别为3.959%和4.061%,计算值与实验数据吻合很好。 相似文献
6.
提出了一种新型的实复值混合时延神经网络,用于建模和线性化宽带射频功放.该神经网络包含输入信号的广义记忆效应、复值输入信号和复值输入信号模值的分数阶次,因而其建模精度显著提高.对实复值混合时延神经网络在不同扩展常数、记忆深度、神经元数和阶数时的归一化均方误差(NMSE)进行了比较研究,以建立一个能够有效建模宽带功放强非线性的基带模型—最优时延神经网络(TDNN).采用51 dBm宽带功放和25 MHz带宽的混合测试信号用于模型的有效性验证.测试结果表明,实复值混合时延神经网络相比记忆多项式模型和实值时延神经网络具有更高的建模精度,NMSE提高5 dB.此外,实复值混合时延神经网络相比广义记忆多项式模型,NMSE提高0.6 dB,并具有更好的数值稳定性.相比实值时延神经网络和记忆多项式模型,所提出的时延神经网络能够更好地抑制带外的频谱再生. 相似文献
7.
将化学工程学原理应用到药物释放这一多学科领域，研究了初始浓度分布为线性的平板混合药膜体系释放动力学模型，该模型可用来描述高装填量平板混合药膜的释放后期，并可简化为无限渗阱时的特定情况．根据该模型，计算了混合药膜内的浓度－距离分布和浓度－时间分布曲线，研究了释放介质体积对释放过程的影响． 相似文献
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齐铭策 《河南职业技术师范学院学报》1997,25(4):54-56
本文在研究淀粉的硝酸氧化法制草酸时，摒弃了把硝酸溶液逐步加入硫酸、催化剂和糖的混合溶液中的操作方法，而是采用了将糖液逐步加入硫酸、硝酸和催化剂的混合溶液中的操作方法。避免了硝酸溶液局部瞬间浓度过大造成的恶果，明显提高了产率。 相似文献
11.
Paul Shabajee 《British journal of educational technology : journal of the Council for Educational Technology》1999,30(2):101-113
This paper puts forward a prototype process for the development of educational multimedia materials, which can help educational multimedia software developers produce more coherent and effective learning resources by making explicit the value/belief system on which the project is founded. The prototype is presented as an object and stimulus for debate and discussion, around the many issues it raises.
The paper critically reviews some current models of educational multimedia software development with regard to the role of "values/beliefs" and discusses why there is a need for these factors to be taken into account. It particularly focuses on environmental issues and is more widely applicable to those subject areas which involve the teaching of "controversial issues".
The basic process put forward involves three steps: 1) identifying and agreeing a prioritized list of the core values and beliefs on which the project is based 2) using these to inform the specification/design process 3) using them as part of the evaluation/quality control process. The process is illustrated using a small number of examples and the paper ends by looking forward to a full trial of the prototype and suggestions for further work. 相似文献
The paper critically reviews some current models of educational multimedia software development with regard to the role of "values/beliefs" and discusses why there is a need for these factors to be taken into account. It particularly focuses on environmental issues and is more widely applicable to those subject areas which involve the teaching of "controversial issues".
The basic process put forward involves three steps: 1) identifying and agreeing a prioritized list of the core values and beliefs on which the project is based 2) using these to inform the specification/design process 3) using them as part of the evaluation/quality control process. The process is illustrated using a small number of examples and the paper ends by looking forward to a full trial of the prototype and suggestions for further work. 相似文献
12.
许彩云 《淮阴师范学院学报(哲学社会科学版)》2001,23(3):415-417,,420,
特定言语行为意图与特定言语行为条件构成特定言语行为类型，每个言语行为类型都有一个属于它自己的原型。但某类言语行为在具体实施过程中会因其构成条件的变化而采取相应的策略，进而带来了原型的变化，产生原型变体。 相似文献
13.
钢液真空循环精炼过程的物理模拟 总被引：2，自引：0，他引：2
魏季和 《上海大学学报(英文版)》2003,7(1):1-17
1 Ｉｎｔｒｏｄｕｃｔｉｏｎ Ａｓａｓｅｃｏｎｄａｒｙｓｔｅｅｌｍａｋｉｎｇｔｅｃｈｎｏｌｏｇｙ ,ｔｈｅＲＨ(Ｒｕｈｒｓｔａｈｌ Ｈｅｒａｅｕｓ)ｖａｃｕｕｍｃｉｒｃｕｌａｔｉｏｎｒｅｆｉｎｉｎｇｐｒｏ ｃｅｓｓｈａｓｂｅｅｎａｐｐｌｉｅｄｗｉｄｅｌｙａｎｄｄｅｖｅｌｏｐｅｄｒａｐｉｄｌｙｉｎｐｒｅｖｉｏｕｓｆｏｕｒｄｅｃａｄｅｓ .Ｗｉｔｈａｃｏｎｔｉｎｕｏｕｓｌｙｇｒｏｗｉｎｇｄｅｍａｎｄｆｏｒｈｉｇｈｑｕａｌｉｔｙａｎｄｈｉｇｈｌｙｃｌｅａｎｓｔｅｅｌ,ｉｔｈａｓｎｏｗｂｅｃｏｍｅ ,ｔｏａｃｏｎｓ… 相似文献
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曾志芳 《邵阳学院学报(社会科学版)》2008,7(5)
词义引申研究是词汇研究的重要方面。许多学者从不同角度对词义引申进行研究,但对词义引申在原型范畴理论层次上的研究不多。文章立足于原型范畴理论借助语料对词义引申进行浅析研究,并分析汉语中常见的四种词性在意义引申过程中发生词性变化及其发展趋势。 相似文献
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Robert J. Sternberg 《Educational Psychology Review》1996,8(2):175-185
Educational psychology has fallen, but it can get up. It has fallen because of its uncertainty, as a field, as to its own core. I argue that the core of the field ought to be in the multifaceted analysis of the teaching—learning process. A useful construct for analyzing this process is that of expertise—what is it that makes for an expert teacher and an expert learner? Expertise is a prototype, and so in order to understand expertise, we need to understand the prototypes we have formed for expert teachers and students. I discuss the prototype of the expert teacher in terms of knowledge, efficiency, and insight; and the prototype of the expert student in terms of the kinds of abilities that are currently valued in schools and that we might further value. This discussion therefore points out that prototypes are not fixed: We can decide what we value, and thereby, what constitutes expertise in a given domain. 相似文献
16.
Ying ZHU Yi ZHENG Yuan-yuan SHEN Xin CHEN Xin-yu ZHANG Hao-ming LIN Yan-rong GUO Tian-fu WANG Si-ping CHEN 《Journal of Zhejiang University. Science. B》2014,15(4):375-381
研究目的：肝脏的纤维化进程改变肝脏组织的流变属性。创新要点：本文利用剪切黏弹性模量描绘并比较了大鼠肝脏F0期到F4期的纤维化过程。研究方法：两个黏弹性模型,即Zener模型和Voigt模型用于解释流变力学测试得到的实验数据,由此得到每个纤维化分期的肝脏弹性和黏性值。重要结论：肝脏中度纤维化（≤F2期）与黏弹性值密切相关。Zener模型的弹性均值E1从F0期的（0.452±0.094）kPa增加到F2期的（1.311±0.717）kPa,而Voigt模型的弹性均值E从F0期的（0.618±0.089）kPa增加到F2期的（1.701±0.844）kPa。Zener模型的黏性均值从F0期的（3.499±0.186）Pa·s增加到F2期的（4.947±1.811）Pa·s,而Voigt模型的黏性均值从F0期的（3.379±0.316）Pa·s增加到F2期的（4.625±1.296）Pa·s。无论选用哪个黏弹性模型,在F1期和F2期,肝脏弹性值的标准差比黏性值的标准差变化要小。因此,测得的弹性比黏性更有效地区分肝纤维化F0期到F2期。 相似文献
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罗静 《柳州职业技术学院学报》2012,12(3):75-78
原型心理内涵的双重性是指侧重于文化心理和集体无意识范畴的原型和侧重于认知过程和创造心理方面的原型。原型范畴特点决定了原型受文化普遍性和差异性的影响。文化定势渗透到原型中,影响到原型与范畴成员的关系,决定着原型的文化语境。 相似文献
18.
"钓鳌"这一意象在古代文学作品中反复出现,在探求"钓鳌"本事的起源的基础上,进而阐释"钓鳌"作为一种意象和情结其本身的审美价值和对后世的影响:它已经成为中国士大夫精神世界的一座堡垒,借以安慰自己,从而尝试窥探出古人隐于"钓鳌"情结中一种传统的文人价值观。 相似文献
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Harber Clive 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1998,44(5-6):569-582
Education under apartheid in South Africa was characterised by racism and segregation. Since the first democratic election in 1994 a process of racial desegregation has begun in South African schools. However, desegregation is not the same as integration. Given the historical context of South Africa, simply mixing students from different racial groups in one school is likely to result in racial conflict and violence unless the structure and processes of schooling are changed at the same time. This article examines the experience of one school in South Africa which has not only desegregated its intake but has also attempted to democratise its management structures in order to teach democratic values through experience and in particular to foster a climate of mutual respect among students so as to decrease racial distrust. So far, the changes appear to be successful but there are a number of important lessons to be learned. 相似文献