用耐温耐压测氧探头测定邻二甲苯空气氧化鼓泡塔中的传质和反应动力学

用耐温耐压银一铅原电池型测氧探头连续测定了邻二甲苯空气氧化鼓泡塔中的氧含量,从而计算了带反应的传质系数、并建立了反应动力学方程式。发现120℃体积传质系数K_(La)基本上不随氧化深度而改变。在空塔气速u_g～0.05 m/s的条件下,平均约为1377小时~(-1)。在钴催化剂含量为160ppm时(120℃)反应动力学方程式可表示为: _(c-x)=((4.16-24.91CopA)×10~(-3)C_(o-x))/(1+0.65×10~(-5))(C_(o-x)/Co_2)     

过硫酸盐溶液吸收烟气中NO的动力学

在鼓泡吸收反应器中,以过硫酸盐溶液为氧化剂吸收脱除烟气中NO,以双膜理论为基础,研究了吸收过程中的传质动力学。对NO的氧化吸收过程进行了分析,建立了气液传质模型,测定了动力学参数。比相界面(a)和气相传质系数(KG)。结果显示:温度为75℃,过硫酸盐溶液浓度在0.05~0.2 mol范围内,NO浓度≤1 000×10~(-6)(ppm),NO的反应级数为0.5,过硫酸钠的反应级数为1,并确定了过硫酸盐溶液吸收NO总的传质速率方程。     

1-苯基-3-甲基-4-苯甲酰基吡唑啉酮-5与中性磷试剂对铕的协同萃取

本文研究1-苯基-3-甲基-4-苯甲酰基吡唑啉酮-5(PMBP)与丁基膦酸二丁酯(DBBP)或磷酸三丁酯(TBP)的氯苯溶液在硝酸介质中对Eu(Ⅲ)的协同萃取。测得了萃合物的组成为EuA_3·HA、EuA_3·2DBBP或EuA_3·2TBP。在18℃时的萃取平衡常数分别为: Eu~(3 )(<10~(-5)M)/HNO_3,NaNO_3/(μ=0.1)/PMBP-C_6H_5Cl体系 K_3=[EuA_3·HA]_0[H~ ]~3/[Eu~(3 )][HA]_0~4=1.51×10~(-3) Eu~(3 )(<10~(-5)M)/HNO_3,NaNO_3(μ=0.1)/PMBP—DBBP—C_6H_5Cl体系 K_(s·e)=[EuA_3·2DBBP]_0[H~ ]~3/[Eu~(3 )][HA]_0~3[B]_0~2=2.40×10~2 Eu~(3 )(<10~(-5)M)/HNO_3,NaNO_3(μ=0.1)/PMBP-TBP-C_6H_5Cl体系 K_(s·e)=[EuA_3·2TBP]_0[H~ ]/[Eu~(3 )[HA]_0~3[B]_0~2=1.74×10~1 讨论了萃合物的结构及协同萃取的机理。     

醋酸酐水解反应的宏观动力学探讨

采用连续搅拌釜式反应器(Continuous Stirred Tank Reactor简称CSTR)在常压、30～60℃的温度范围内,对醋酸酐水解反应的宏观动力学进行了探讨。结果表明,在本实验条件下(搅拌转速为600rpm),醋酸酐水解反应的表观级数为一级,其动力学表达式如下: r=4.852×10~8EXP(-6.817×10~3/T)C_(AO)(1-X_A)反应速度常数k的温度效应可用Arrhenius方程表述,即1n k=-E/RT 1n A表现活化能E=56.7[kJ/mol]。     

在MoBiP_(0.1)/SiO_2催化剂上丁烯异构化动力学

本文用外循环玻璃无梯度反应器研究了MoBiP_(0.1/SiO_2催化剂的丁烯异构化动力学。实验数据用可逆三角反应L-H机理动力学方程描述。方程中动力学参数用正交设计法估计。 丁烯-1异构成反-丁烯-2及顺-丁烯-2的动力学方程分别为 r_(1-t)=(3.70×10~2e~(-11000/RT)×4.5×10~2e~(6400/RT)(P_1-P_2/K_(T/1))/1+4.5×10~2e~(6400/RT)P_1+5.92×10~(-2)e~3000/RT)P_t+9.96×10~(-1)e~(1180/RT)P_c;丁烯-2异构化时顺-丁烯-2异构化速度     

一类射影平坦球对称芬斯勒度量

讨论了球对称芬斯勒度量F=|y|Φ(|x|~2/2,x,y|y|),其中x∈B~n(r)■R~n,y∈T_xB~n(r)\{0},Φ∶[0,r)×R→R,通过构造其射影平坦偏微分方程,得到了一个可以展成形如Φ(t,s)=e~(λt)[a_0+a_1s+∑_(k=1)~∞(-1)~(k-1)·a_0s~(2k)/(2k-1)(2k)!!]的解.     

LC-MS测定大花罗布麻中植物激素的方法学研究

目的:建立高效液相色谱法-电喷雾串联质谱联用分析大花罗布麻中植物激素的分析方法.方法:采用C_(18)SPE柱提取大花罗布麻叶中植物激素,在色谱柱为Agilent SB-C_(18)(50 mm×2.1 mm,1.8μm),0.5%甲酸水-甲醇为流动相,在MRM模式下,ESI负离子模式,毛细管电压为4 k V,干燥器流量为10 L·min~(-1),干燥器温度为350℃等条件下,建立液相色谱法-电喷雾串联质谱(LC-MS)联用分析大花罗布麻叶中五种植物激素的方法.结果:大花罗布麻叶中五种植物激素ABA、IBA、IAA、GA_3、JA含量分别为9.800×10~3μg·kg~(-1)、3.073×10~4μg·kg~(-1)、1.403×10~4μg·kg~(-1)、4.475×10~4μg·kg~(-1)、2.508×10~4μg·kg~(-1);五种激素在各自对应的线性范围内线性关系良好.结论:方法灵敏、准确,适合用于大花罗布麻叶中植物激素含量的测定.     

关于方程 f″+(e~(P(z))+Q(z))f=0的振荡性质

本文得到如下主要结果:设 P(z)和 Q(s)为多项式,degP=m>0。若方程f″+(e~(P)(z))+Q(z))f=0存在一非平凡解 f,使得λ(f)相似文献   

Zn-Ni-Mg合金超塑性C_2~(δ_F—δ_L)—(m_L=m_(min))型m-δ关系曲线

对Zn-Ni-Mg合金超塑性的m-C-δ或m-k-δ关系曲线(简称m-δ关系曲线)进行了测定。测到的曲线均属m_L=m_(min)型,可以用下面的C_2~(δ_F-δ_L)型L.Q.m-δ“规划”方程式表示δ(％)=[C_2~(δ_F-δ_L)ε~(m-mo)-1]×100 当δ=δ_O=0.00％时,m=m_O,C_2~(δ_F-δ_L)=1;当δ=δ_I时,m=m_I,C_2~(δ_F-δ_L)=C_I;当δ=δ_F时,m=m_F,C_2~(δ_F-δ_L)=C_F。ε为应变速率(min~(-1))。将这类曲线称为C_2~(δ_F-δ_L)-(m_L=m_(min))型曲线。在170,190,210,230和250℃的温度,若速率为3.5×10~(-2)min~(-1)(平均)测到的曲线均属基本形式。关系成近似的直线上升。其斜率在极限应变δ_L处突然增大,直到断裂。若速率为1.9×10~(-2)和8.6×10~(-2)min~(-1)测到的曲线均属单纯的上升式。(m_L=m_(min))=m_O相似文献   

二元一阶常系数线性微分方程组的新解法

对于二元一阶常系数线性微分方程组:x′=Ax+f(t),引入特征根方程|A-λE|=0的特征行向量K=(k_1,k_2)(其中K满足:K~T(A-λE)=0)概念,将二元一阶常系数线性微分方程组,化为二元一次代数线性方程:k_1x_1+k_2x_2=C_1e~(λt)+e~(λt)∫(k_1f_1+k_2f_2)e~(-λt)dt,并结合代数线性方程和一阶线性微分方程的理论,给出原微分方程组的解.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that