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外场作用下多组分质量传递Maxwell-Stefan方程及其应用:电场作用下球形颗粒中的扩散 被引量:4
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作者 韩光泽 杜尚永 陈明东 《化工学报》 EI CAS CSCD 北大核心 2012年第2期416-423,共8页
Fick扩散定律只能用于没有外场作用下的二组分扩散过程,Maxwell-Stefan(MS)方程适用于外场作用下多组分系统中的质量传递过程。阐述了MS方程的物理意义,并由此将外场作用下普遍化MS方程的表达式改写为清晰且易于使用的形式。给出了在MS... Fick扩散定律只能用于没有外场作用下的二组分扩散过程,Maxwell-Stefan(MS)方程适用于外场作用下多组分系统中的质量传递过程。阐述了MS方程的物理意义,并由此将外场作用下普遍化MS方程的表达式改写为清晰且易于使用的形式。给出了在MS方程中常用的外场作用力的数学形式。Fick扩散定律是MS方程在没有外场作用下对二元理想流体扩散的应用;MS方程对离心分离和电解质扩散等过程的描述比传统的描述方法更全面。利用MS方程导出了欧姆定律,利用该结论可以通过测量电导率计算带电粒子的扩散系数。利用MS方程研究了电场作用下球形颗粒中的扩散过程,结果表明,该方程可以对电场强化质量传递过程给出有效描述。MS方程为外场作用下的质量传递过程提供了一种有效的理论研究方法。 展开更多
关键词 MAXWELL-STEFAN方程 组分质量传递 外场强化传质
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心肌急性梗塞后心室重构早期心肌线粒体呼吸功能和电子传递组分的改变 被引量:2
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作者 李志梁 钱学贤 +3 位作者 章同华 秦永文 陈克明 陈晓晴 《中国应用生理学杂志》 CSCD 1995年第4期333-336,共4页
结扎大鼠冠状动脉前降支造成急性心肌梗塞(AMI),观察在AMI后心室重构早期3、7、14d心肌线粒体呼吸功能和电子传递组分的改变。结果表明:在心室重构早期,心肌线粒体呼吸Ⅳ态(R_4)明显增高(P<0.02);呼吸Ⅲ... 结扎大鼠冠状动脉前降支造成急性心肌梗塞(AMI),观察在AMI后心室重构早期3、7、14d心肌线粒体呼吸功能和电子传递组分的改变。结果表明:在心室重构早期,心肌线粒体呼吸Ⅳ态(R_4)明显增高(P<0.02);呼吸Ⅲ态(R_3)、呼吸控制率(RCR)、磷/氧比(P/O)、氧化磷酸化速率(OPR)明显下降(P<0.001);呼吸链电子传递组分显著降低(P<0.05或P<0.01)。提示:AMI后心室重构早期心肌线粒体呼吸和氧化磷酸化功能明显受损,是AMI后慢性心力衰竭的重要原因。 展开更多
关键词 心肌梗塞 心肌重构 线粒体 呼吸 电子传递组分
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交指状流场质子交换膜燃料电池的数值分析 被引量:1
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作者 胡桂林 樊建人 《浙江大学学报(工学版)》 EI CAS CSCD 北大核心 2009年第6期1147-1151,共5页
为研究流场结构设计对电池内的流动、组分传递和电池性能等的影响,建立了一个稳态的三维非等温质子交换膜燃料电池数学模型,应用此模型对一个交指状流场设计的电池单体(电极面积为6.4 cm×6.5 cm)进行了数值研究.数值计算得到了电... 为研究流场结构设计对电池内的流动、组分传递和电池性能等的影响,建立了一个稳态的三维非等温质子交换膜燃料电池数学模型,应用此模型对一个交指状流场设计的电池单体(电极面积为6.4 cm×6.5 cm)进行了数值研究.数值计算得到了电池的温度、组分质量浓度和局部电流密度等的空间分布,分析了不同电池反应物湿度等对电池特性的影响.结果表明,受传质的影响,沟道下方阴极催化层的温度大于相应沟脊下方的区域;与饱和气流进气的基本工况相比,降低阴极的进气湿度能提高电池的性能,而降低阳极的进气湿度则会导致电池性能的下降. 展开更多
关键词 质子交换 膜燃料电池 交指状流场 两相流 组分传递
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The components transitive regularity of three dosage forms of Liuwei Dihuang Fufang 被引量:1
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作者 ZHU Junping ZHANG Xili +3 位作者 ZHAO Jing LIANG Huihui LI Yuanhua LIU Wenlong 《Digital Chinese Medicine》 2022年第1期68-74,共7页
Objective To explore the transitive regularity of holistic constituents from the crude slices of the medicinal raw materials(MCS)to the formula granules(FG),fufang decoction(FD),and finally,the concentrated pills(CP)o... Objective To explore the transitive regularity of holistic constituents from the crude slices of the medicinal raw materials(MCS)to the formula granules(FG),fufang decoction(FD),and finally,the concentrated pills(CP)of Liuwei Dihuang Fufang(六味地黄复方,LWDHF).Methods Samples for MCS,FG,FD,and CP of LWDHF were obtained,and a fingerprint data-base was established using high-performance liquid chromatography(HPLC),by separating the samples in an XB-C18 column and analyzing the transitive regularity of components us-ing the total quantum statistical moment(TQSM),including total quantum zero moment(AUCT),total quantum first moment(MRTT),total quantum second moment(VRTT),and its similarity approach.The AUCT,MRTT,and VRTT were calculated based on the representative HPLC chromatograms of FG,FD,and CP of LWDHF.Results AUCT of FG,FD,and CP of LWDHF was 71804,46553,and 144646μV·s,respectively;MRTT was 14.43,14.54,and 18.85 min,respectively;and VRTT was 106.98,112.84,and 269.12 min2,respectively.Comparing the similarity of FG/FD,FG/CP and FD/CP of LWDHF,the TQSM similarity values were 98.66%,76.62%,and 75.37%,respectively,whereas the tradi-tional similarity evaluation values were 98.68%,85.43%,and 85.60%,respectively.Conclusion The results perform little distinction in the total composition between FG and FD,whereas some distinction existed between FD and CP.Experimental evidence,therefore indicates that FG could be used as the alternative of MCS in clinical applications. 展开更多
关键词 Liuwei Dihuang Fufang(六味地黄复方 LWDHF) Formula granules Fufang decoction Concentrated pills Total quantum statistical moment(TQSM) High-performance liquid chromato-graphy(HPLC) Component transitive regularity
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On Total Domination Polynomials of Certain Graphs
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作者 S. Sanal H. E. Vatsalya 《Journal of Mathematics and System Science》 2016年第3期123-127,共5页
We have introduced the total domination polynomial for any simple non isolated graph G in [7] and is defined by Dt(G, x) = ∑in=yt(G) dr(G, i) x', where dr(G, i) is the cardinality of total dominating sets of... We have introduced the total domination polynomial for any simple non isolated graph G in [7] and is defined by Dt(G, x) = ∑in=yt(G) dr(G, i) x', where dr(G, i) is the cardinality of total dominating sets of G of size i, and yt(G) is the total domination number of G. In [7] We have obtained some properties of Dt(G, x) and its coefficients. Also, we have calculated the total domination polynomials of complete graph, complete bipartite graph, join of two graphs and a graph consisting of disjoint components. In this paper, we presented for any two isomorphic graphs the total domination polynomials are same, but the converse is not true. Also, we proved that for any n vertex transitive graph of order n and for any v ∈ V(G), dt(G, i) = 7 dt(V)(G, i), 1 〈 i 〈 n. And, for any k-regular graph of order n, dr(G, i) = (7), i 〉 n-k and d,(G, n-k) = (kn) - n. We have calculated the total domination polynomial of Petersen graph D,(P, x) = 10X4 + 72x5 + 140x6 + 110x7 + 45x8 + [ 0x9 + x10. Also, for any two vertices u and v of a k-regular graph Hwith N(u) ≠ N(v) and if Dr(G, x) = Dt( H, x ), then G is also a k-regular graph. 展开更多
关键词 total dominating set total domination number total domination polynomial
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烟草两组分信号基因NTHK1受发育及伤害逆境调节
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作者 张劲松 谢灿 陈受宜 《云南大学学报(自然科学版)》 CAS CSCD 1999年第S3期29-29,共1页
关键词 基因 乙烯受体 烟草 诱导表达 组分信号传递系统 中国科学院 遗传研究 植物生长物质 生长和发育 乙烯利
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Orbit determination and prediction for Beidou GEO satellites at the time of the spring/autumn equinox 被引量:8
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作者 LI XiaoJie ZHOU JianHua +3 位作者 HU XiaoGong LIU Li GUO Rui ZHOU ShanShi 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第8期86-94,共9页
Geostationary(GEO) satellites form an indispensable component of the constellation of Beidou navigation system(BDS). The ephemerides, or predicted orbits of these GEO satellites(GEOs), are broadcast to positioning, na... Geostationary(GEO) satellites form an indispensable component of the constellation of Beidou navigation system(BDS). The ephemerides, or predicted orbits of these GEO satellites(GEOs), are broadcast to positioning, navigation, and timing users. User equivalent ranging error(UERE) based on broadcast message is better than 1.5 m(root formal errors: RMS) for GEO satellites. However, monitoring of UERE indicates that the orbital prediction precision is significantly degraded when the Sun is close to the Earth's equatorial plane(or near spring or autumn Equinox). Error source analysis shows that the complicated solar radiation pressure on satellite buses and the simple box-wing model maybe the major contributor to the deterioration of orbital precision. With the aid of BDS' two-way frequency and time transfer between the GEOs and Beidou time(BDT, that is maintained at the master control station), we propose a new orbit determination strategy, namely three-step approach of the multi-satellite precise orbit determination(MPOD). Pseudo-range(carrier phase) data are transformed to geometric range(biased geometric range) data without clock offsets; and reasonable empirical acceleration parameters are estimated along with orbital elements to account for the error in solar radiation pressure modeling. Experiments with Beidou data show that using the proposed approach, the GEOs' UERE when near the autumn Equinox of 2012 can be improved to 1.3 m from 2.5 m(RMS), and the probability of user equivalent range error(UERE)<2.0 m can be improved from 50% to above 85%. 展开更多
关键词 Beidou system (BDS) Beidou time (BDT) geostationary (GEO) satellite spring equinox/autumn equinox solar radia-tion pressure time synchronization user equivalent ranging error
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