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Search Results: 1 - 10 of 59006 matches for " 胡瑶 "
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锌K-Alpha X射线组态互相作用计算
Relativistic Configuration Interaction Calculations for the K-Alpha X-Ray of Zinc
 [PDF]

,
Applied Physics (APP) , 2014, DOI: 10.12677/APP.2014.41001
Abstract:
采用结合包含Breit相互作用、量子动力学效应和有限核质量修正的相对论的组态相互作用的方法以及多组态Dirac-Fock方法的能级优化法来计算锌离子的波长、电偶极跃迁速率以及振子强度。利用活动空间扩大法,计算出的类氦和类铍的数据与实验数据符合很好。在此基础上本文给出了准确的锌离子类氦到类氖的跃迁特性。这些数据可以给锌等离子体的能级寿命、布居分布以及平均电荷提供参考。
Relativistic configuration interaction calculations with the inclusion of Breit interaction, quantum electrodynamics and finite nuclear mass corrections have been carried out in the extended optimal level scheme using multi- configuration Dirac-Fock wavefunctions on the wavelengths, electric dipole transition rates and oscillator strengths of Zinc. Through the use of the active space method, the calculated values are compared with the other available data on He-like and Be-like zinc and are found to be in very good agreement with them. In this paper, we give accurate transition properties from Zn XXI through Zn XXIX. These data provide reference value for level lifetime, charge state distribution and average charge of zinc plasmas.
基于电导率的地沟油快速鉴别方法的改进
Improvement on the Rapid Detection Method of Waste Oil Based on Electrical Conductivity
 [PDF]

, 吴次南
Applied Physics (APP) , 2013, DOI: 10.12677/APP.2013.38030
Abstract:

以合格食用油和地沟油为样品,探究油脂种类、温度、水油比例对电导率检测影响,找出能更准确更快的检测油脂电导率的条件。本实验采用的方法是取油样10 ml时,加正己烷25 ml,去离子水30 ml,70℃恒温水浴振荡30 min,分离油、水相,再将水相置于70℃水浴中测其电导率。在此条件下,由于去离子水的增加,分离出更多更清澈的水相使检测时水相能将电极完全淹没,减小了由于电极不能完全淹没在水中而产生的误差;升高振荡时的水浴温度,振荡后不用静止马上就能分离出清澈的水相,缩短了实验时间,水相清澈减小了由于水相中含有油珠而对电导率检测产生的影响,而且升高振荡时的水浴温度使油脂中的杂质或离子能尽可能全部溶解到水中,更准确的反映油脂中含杂质或离子情况;升高检测时的水相温度使合格油与地沟油间的电导率差距变大,减小了把电导率处于中间的合格油判为地沟油或把地沟油判为合格油的可能。同时,保持检测时水相的温度与分离油、水相时的温度一致,能更准确的反应分离时杂质或离子在水相中的溶解情况。因此该方法不但大大提高了检测电导率的准确性,还提高分离速度。
Using the qualified edible oil and waste oil for sample, we explore the influence of oil types, temperature, the ratio of water and oil for electrical conductivity, to find out a test condition which can faster and more accurately detect grease conductivity. This method adopted in the experiment is that inject n-hexane 25 ml, 30 ml deionized water, then vibrate 30 min in 70?C thermostatic water bath to separate the oil and water phase, then put the water phase in 70?C thermostatic water bath measuring the conductivity when the 10 ml of sample is taken. On this condition, it can extract clearer water which can make the pole be completely submerged when detection, thus it reduces the error because the pole can not be completely submerged in water. Because the water bath temperature has risen higher, the clear water can be fleetly separated from mixture sample after vibration, hence it shortens the time of experiment. Clear water reduced the influence of oil droplets for conductivity detection, and the rising bath temperature of vibration can make impurities or ions in oil dissolve in water as much as possible, thereby, the measuring result can more accurately reflect the condition of impurities or ions in oil. Rising the bath temperature of detection increased the conductivity gap of qualified oil and waste oil, thus the possibility of mis-judgement was reduced, meanwhile, keeping water temperature of detection and separation the same can more accurately reflect the condition of impurities or ions in water when separation. Therefore, this method not only boosts veracity of conductivity detection, but also increases speed of separation.

化学动力学与化学热力学之间的联系

科学通报 , 1979,
Abstract: 物理化学建立的初期,就注意到反应速率与热力学量的联系;质量作用定律就是从化学动力学和化学热力学两个角度总结出来的结果。Eyring的绝对速率理论(过渡状态理论)利用活化络合物与反应物的标准熵变、标准焓变来计算反应速率常数。
基因组比较数据可视化的快速实现
,钟扬
复旦学报(自然科学版) , 2014,
Abstract:
温度与温标

物理 , 1974,
Abstract: ?一、引言人类对于冷热的感觉是在很早以前就有的.夏季的炎日,寒冬的冰河,早就作用于他们的感官并逐渐在人们的头脑里形成了概念.但是,使冷热的概念精确化、温度(数值)和温度计的出现,却是近三百年来的事情.1660年酒精温度计的出现是向冷热现象作探讨的重要一步.1714年华伦海脱(fahrenheit)改良了水银温度计,大体上以当地冬季最冷的气温为0℃,以人的体温约为100°,这样一来,就造成了水的?...
带有媒体报道的H7N9传染病模型的研究
A Study of the Epidemic Model of H7N9 with Media Coverage
 [PDF]

, 孙法国, 新利, 刘艳
Advances in Applied Mathematics (AAM) , 2015, DOI: 10.12677/AAM.2015.43035
Abstract: 建立了带有媒体报道的H7N9型禽流感模型,研究媒体报道对H7N9型禽流感传染病传播的影响,并得到了模型的基本再生数R0。再利用V函数、Dulac函数及极限方程理论等方法对此模型进行了稳定性分析。证明了当R0≤1时,无病平衡点全局渐近稳定;当R0>1时,地方病平衡点全局渐近稳定,发现媒体报道对控制H7N9型禽流感有很大的影响。
An epidemic model of avian influenza (H7N9) with media coverage is established in the article to investigate the impact of media coverage on the spread of infectious diseases, and the basic re-production number of model is obtained. Then, the stability of the model has been analyzed by using V function, Dulac function and the limit equation theory. We prove that the disease free equilibrium is globally asymptotically stable if R0≤1; the epidemic equilibrium is globally asymp-totically stable if R0>1. In addition, the results imply that media coverage have a great influence to control avian influenza (H7N9).
丹江口水库历史洪水不确定性对设计成果的影响研究
Effect of Historical Flood Uncertainty on Design Floods in the Danjiangkou Reservoir
 [PDF]

, 郭生练, 刘章君
Journal of Water Resources Research (JWRR) , 2016, DOI: 10.12677/JWRR.2016.53032
Abstract:
因资料条件等原因,所考证到的历史洪水在量级和重现期方面总存在一定的误差。研究这种不确定性对设计成果的影响,对提高设计成果质量有重要的意义。以丹江口水库为实例,分别采用适线法(CF)和线型矩法(LM)估计P-III型分布参数,建立了P-III/CF,P-III/LM两种洪水频率分析模型推求设计洪水,研究探讨了历史洪水不确定性对设计成果的影响。结果表明:历史洪水量级误差和重现期误差对设计成果均有一定的影响,但量级误差对设计成果的影响比重现期误差显著得多。P-III/CF模型计算的影响要大于P-III/LM模型。
The historical floods always have some errors in terms of the magnitude and the return period due to many complex factors. Analyzing these uncertainty effects can improve the quality of design flood esti-mation. The P-III/CF and P-III/LM frequency analysis models in which P-III distribution couples with Curve-Fitting (CF) and L-Moment (LM) parameter estimation methods are used to evaluate the uncertainty of historical floods in the Danjiangkou Reservoir. The results show that the historical flood magnitude errors have more significant influence on design floods than the return period errors. The effects of historical flood on design floods estimated by P-III/CF model are larger than those by P-III/LM model.
EMR固体润滑膜之研究
赵家,修元
摩擦学学报 , 1982,
Abstract: 本文介绍了作者近年来研制的以环氧树脂为粘结剂的常温固化干膜的成膜工艺及其摩擦磨损性能。这种干膜具有同类型高温固化干膜的耐磨寿命,它可在100℃以下、不接触油和溶剂的条件下使用。
溶剂中金纳米颗粒界面性质的分子模拟
,杨晓宁
化工学报 , 2011,
Abstract: 基于经典的分子动力学模拟方法,研究了不同的超临界CO2(scCO2)溶剂密度下,金纳米颗粒周围溶剂分子的结构与动力学性质。结果表明,由于金纳米颗粒对scCO2溶剂分子有较大的吸引作用,使scCO2分子紧密地围绕在其表面周围并形成了两个较明显的溶剂层。随着溶剂密度的增加,纳米颗粒在scCO2中的溶剂化程度会减小。通过分析固液界面不同区域内scCO服务把本文推荐给朋友纳米颗粒;超临界二氧化碳;分子动力学;结构与动力学性质”几篇好文章,特向您推荐。请点击下面的网址:"name="neirong">加入引用管理器E-mailAlertRSS作者相关文章
EMR固体润滑膜之研究
赵家,修元
摩擦学学报 , 1982,
Abstract: 本文介绍了作者近年来研制的以环氧树脂为粘结剂的常温固化干膜的成膜工艺及其摩擦磨损性能。这种干膜具有同类型高温固化干膜的耐磨寿命,它可在100℃以下、不接触油和溶剂的条件下使用。
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