Activities of Liquid Crystals in Acupuncture Points

The theory of Meridians is an important part of Traditional Chinese Medicine. Modern science should play its role in analysing and making clear the mystique of the theory. The relation between the activities of liquid crystals in acupuncture points and the regulative actions of Meridians was studied in this paper. The results showed the intimate intrinsic association between them.

INTERSECTION POINT RULE OF THE RETENTION VALUE AND NORMAL BOILING POINT OF THE HOMOLOGUES IN REVERSED-PHASE HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY

In this paper, a linear relationship between the logarithm of capacity factor k and normal boiling point to of the homologues has been derived, based on the basic retention equation of liquid chromatography according to statistical thermodyoamics proposed by professor Ln Peizhang and others, This equation has been verified by a large number of experimental data, all the strsight lines of lnk- of bumologues for different mobile phass coaiposltion cross each other at the same point, So the intereection point equation van proposed, wbich was used to prodict the retention valu, the result was satisfactory.

INTERSECTION POINT RULE OF THE RETENTION VALUE AND MOBILE PHASE COMPOSITION OF THE HOMOLOGUES IN REVERSED-PHASE HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY

Based on the intersection point rule of the retention value and normal boiling point of homologues in reversed-phase high-performance liquid chromatography(RPLC), the intersection point rule of the retention value of homologues and mobile phase composition has been derived, and was testified by a lot of experimental data from the literature. With this newly proposed equation, we can use the retention value of the compound in one mobile phase composition to predict its retention value in any other mobile phase composition. For fourteen groups of homologues in five mobile phase compositions on five Kinds of columns, the overall average absolute error of 721 data sets is 2.8%.

1-Methyl-3-octylimidazolium Polyoxomolybdate Ionic Liquid with Low Melting Point and High Stability:Preparation and Photocatalytic Activity

The polyoxometalate（POM）-imidazole ionic liquid（IL） [C8mim]2[Mo6O19]（C8mim=1-methyl-3-octylimi- dazolium） with a low melting point of 82.6 °C was successfully prepared and characterized by FTIR, XPS, NMR, TG and so on. The polyoxomolybdate-based IL has high stability, and its decomposing temperature reaches 321 °C, which is higher than that of 1-alkyl-3-methylimidazolium halides IL. Further photocatalytic performances of the IL were measured via degrading dye rhodamine B（RB） in aqueous solution under the UV light irradiation. The experiments show that the conversion of RB reaches 80.5% after 90 min under UV-light and the degradation efficiency depends on the pH value of the solution, irradiation time and the dosage of the IL and so on.

Optimal design of sintered Ce_9Nd_(21)Fe_(bal)B_1 magnets with a low-melting-point (Ce,Nd)-rich phase

A systemic investigation was done on the chemistry and crystal structure of boundary phases in sintered Ce9Nd21FebalB1 （wt%） magnets. Ce2Fe14B is believed to be more soluble in the rare-earth （RE）-rich liquid phase during the sintering process. Thus, the grain size and oxygen content were controlled via low-temperature sintering, resulting in high coercivity and maximum energy products. In addition, Ce formed massive agglomerations at the triple-point junctions, as confirmed by elemental mapping results. Transmission electron micros- copy （TEM） images indicated the presence of （Ce,Nd）Ox phases at grain boundaries. By controlling the composition and optimizing the preparation process, we successfully obtained Ce9Nd21FebalBx sintered magnets; the prepared magnets exhibited a residual induction, coerciv- ity, and energy product of 1.353 T, 759 kA/m, and 342 kJ/m3, respectively.

A Statistical Thermodynamic Model of Vapor-Liquid Interfacial Tension for Liquid Mixtures at High Pressure

1 INTRODUCTIONInterfacial tension of pure fluids and their mixtures is an important property for the development,design and simulation of many chemical processes.The interfacial behavior has important prac-tical applications in material science,environment science and chemical engineering separationprocesses as well as in secondary or tertiary recovery of petroleum.Although interfacial phenom-ena are rather complicated,interfacial tension of free vapor-liquid interface is considered as a firstand fundamental step of the study.For example,enhanced carbon dioxide“flooding”

Cast-rolling force model in solid-liquid cast-rolling bonding(SLCRB) process for fabricating bimetal clad strips

Based on twin-roll casting, a cast-rolling force model was proposed to predict the rolling force in the bimetal solid-liquid cast-rolling bonding(SLCRB) process. The solid-liquid bonding zone was assumed to be below the kiss point(KP). The deformation resistance of the liquid zone was ignored. Then, the calculation model was derived. A 2D thermal-flow coupled simulation was established to provide a basis for the parameters in the model, and then the rolling forces of the Cu/Al clad strip at different rolling speeds were calculated. Meanwhile, through measurement experiments, the accuracy of the model was verified. The influence of the rolling speed, the substrate strip thickness, and the material on the rolling force was obtained. The results indicate that the rolling force decreases with the increase of the rolling speed and increases with the increase of the thickness and thermal conductivity of the substrate strip. The rolling force is closely related to the KP height. Therefore, the formulation of reasonable process parameters to control the KP height is of great significance to the stability of cast-rolling forming.

Correlation between Structure and Thermal Properties of N-vinyl-3-alkylimidazolium Magnetic Ionic Liquids

Influence of structural variations of N-vinylimidazolium tetrahalogenidoferrate(III) magnetic ionic liquids(MILs) on thermal properties was investigated. Using Gaussian09/B3 PW91/6-311 G(2d, p) density functional methods, the microstructure of the MILs were analyzed. With differential scanning calorimeter(DSC) and thermogravimetric analysis(TGA), the thermal properties of the MILs were performed. The results showed that the interaction energies of ion pairs decreased, the crystallization temperature increased first and then decreased, and the surfusion first decreased and then increased with the elongation of the alkyl chain length on cation;with the increase of Br atom, the interaction energies of ion pairs increased;the interaction energies of ion pairs increased in the MILs with the same cation or anion, the nature of polarity of MILs increased and the melting point rose;as the cation or anion in MILs had a smaller size, it could have the solidsolid transition temperature. The results indicated that the decomposition temperature with the same type of MILs increased with the interaction energies of ion pairs. The interaction energy of ion pairs can be used to illuminate the correlation between the thermal properties and the structure of MILs. ILs possesses the properties of macromolecular.

Melting points of ionic liquids:Review and evaluation

The melting points of ionic liquids(ILs)reported since 2020 were surveyed,collected,and reviewed,which were further combined with the previous data to provide a database with 3129 ILs ranging from 177.15 to 645.9 K in melting points.In addition,the factors that affect the melting point of ILs from macro,micro,and thermodynamic perspectives were summarized and analyzed.Then the development of the quantitative structure-property relationship(QSPR),group contribution method(GCM),and conductor-like screening model for realistic solvents(COSMO-RS)for predicting the melting points of ILs were reviewed and further analyzed.Combined with the evaluation together with the preliminary study conducted in this work,it shows that COSMO-RS is more promising and possible to further improve its performance,and a framework was thus proposed.

Fluid phases of argon: A debate on the absence of van der Waals’ “critical point”

A phase diagram of argon based upon percolation transition loci determined from literature experimental p-V isotherms, and simulation values using a Lennard-Jones model shows three fluid phases. The liquid phase spans all temperatures, from a metastable amorphous ground state at 0K, to ultra-high T. There is a supercritical mesophase bounded by percolation transition loci, and a gas phase. Intersection of two percolation loci in the p-T plane thermodynamically defines a critical line between two coexisting gas and liquid critical states at T = Tc, and the single mesophase for T > Tc. A debate on the absence of a van der Waals critical point in the Gibbs p-T density surface is appended.

A successful case of hydrocarbon dew point analysis during mixing of natural gases in transmission pipeline

The occurrence of liquid condensation in natural gas accounts for new challenges during the interoperability between transmission networks,where condensation would lead to higher pressure drops,lower line capacity and may cause safety problem.A successful case of hydrocarbon dew point(HCDP)analysis is demonstrated during the mixing of natural gases in the transmission pipeline.Methods used to predict the HCDP are combined with equations of state(EOS)and characterization of C6+heavy components.Predictions are compared with measured HCDP with different concentrations of mixed gases at a wide range of pressure and temperature scopes.Software named"PipeGasAnalysis"is developed and helps to systematic analyze the condensation problem,which will provide the guidance for the design and operation of the network.

Stability of liquid crystal systems doped withγ-Fe_(2)O_(3)nanoparticles

In order to explore the stability of a liquid crystal(LC)system doped withγ-Fe_(2)O_(3)nanoparticles,the physical properties(clearing point,dielectric properties),electro-optical properties and residual direct-current voltage(RDCV)of the doped LC system were measured and evaluated at different times.First,the temperature was controlled by precision hot stage,and the clearing point temperature of doped LC was observed and measured by a polarized optical microscope.Using a precision LCR meter,we measured the capacitance-voltage curves of the doped LC system at the temperature of 27℃.The dielectric constant of doped LC was calculated by the dualcell capacitance method.Then,the electro-optical properties of the doped LC system were measured.Finally,the RDCV of the doped LC system was measured and calculated.After five months,the parameters of the doped LC system were re-measured and analyzed under the same conditions to evaluate its stability.The experimental results show that,within five months,the clearing point change rate of doped LC is in the range of 0.24%-1.37%,the change of dielectric anisotropy is in the range of 0.035-0.2,the curves of electro-optical properties are basically fitted,and the change rate of saturated RDCV is about 11.2%,which basically indicate that the LC system doped withγ-Fe_(2)O_(3)nanoparticles has good stability.

Impedance Spectroscopic Study on Room Temperature Ionic Liquid-Water Mixtures

AC impedance spectroscopy in pure room temperature ionic liquids （RTILs） and RTIL-water mixture was measured at the temperature of range from 30 ℃ down to -30 ℃. The cations of RTILs are N,N-diethyl-N-methyl-N-（2-methoxyethyl） ammonium （[DEME]）, 1-ethyl-3-methylimidazolium （[C2mim]） and l-butyl-3-methylimidazolium （[Camim]）, the anions are tetrafluoroborate （[BF4]） and bis（trifluoromethanesulfonyl）imide （[TFSI]）. In all pure RTILs, there are two kinds of local minima in real part of the AC impedance Zreal. By adding water to [DEME][BF4] （0 mol% 〈 x 〈 94 mol%） at room temperature, the local minimum value at higher frequency decreased remarkably at the fixed frequency with increasing water concentration. Above 94 mol% H20, a quite different profile of the AC impedance spectroscopy was obtained. In addition to Zreal. temperature dependence of an imaginary part of the impedance Zimag had an isosbestic point below 94 mol%. The isosbestic point disappeared above 94 mol%. The isosbestic point in Zing reveals an interaction between [DEME][BFa] and H2O.

基于气络学说运用芪归通络口服液联合艾灸治疗气虚血瘀型慢性疲劳综合征的临床观察

【目的】观察基于气络学说,运用芪归通络口服液(广东省第二中医院院内制剂,由黄芪、当归、三七、赤芍、牛膝、鸡血藤、丹参、地龙等中药组成)联合艾灸治疗气虚血瘀型慢性疲劳综合征(chronic fatigue syndrome,CFS)的临床疗效。【方法】采用回顾性研究方法,根据治疗方法的不同将60例气虚血瘀型CFS患者分为观察组和对照组,每组各30例。对照组给予艾条温和灸神阙穴治疗,观察组在对照组的基础上联合芪归通络口服液治疗,疗程为4周。观察2组患者治疗前后中医证候积分、疲劳量表-14(FS-14)评分、血清免疫球蛋白IgA、IgM、IgG含量及皮质醇(COR)水平的变化情况,并评价2组患者的临床疗效和安全性。【结果】(1)疗效方面,治疗4周后,观察组的总有效率为96.67%(29/30),对照组为80.00%(24/30),组间比较,观察组的临床疗效明显优于对照组(P<0.05)。(2)量表评分方面,治疗后,2组患者的中医证候积分、FS-14评分均较治疗前明显降低(P<0.01),且观察组对中医证候积分、FS-14评分的降低作用均明显优于对照组(P<0.01)。(3)实验室指标方面,治疗后,2组患者血清IgA、IgG水平以及观察组血清IgM、COR水平均较治疗前明显升高(P<0.01),且观察组对血清IgA、IgM、IgG及COR水平的升高作用均明显优于对照组(P<0.05或P<0.01)。(4)安全性方面,治疗过程中,2组患者均未发生明显不良反应。【结论】基于中医气络学说,以正虚络阻为CFS核心病机,运用补虚通络法,采用芪归通络口服液联合艾灸治疗气虚血瘀型CFS患者疗效确切,能明显缓解患者的临床症状,提高患者的免疫力水平,调节患者的神经-内分泌-免疫(NEI)网络。

点面电极直接放电在水处理中的应用

液体中直接放电技术对于水处理等领域的发展起到了很好的促进作用,本文以液体中直接放电的电极结构设计为主线,介绍了基本的液体中点-面电极放电发生器的设计思想,分析了不同电极构型放电发生器的优势与不足,列举了目前用于水处理的多点-面、线-面(筒)、多孔陶瓷电极等较大体积放电发生器的结构特点及设计,总结了实际应用中液体中点面电极直接放电技术提升所面临的挑战。

基于PLC控制器的造纸机干燥部管理方案研究

为实现针对造纸机干燥部的自动化管理,节约造纸企业的蒸汽使用量,降低纸张生产成本,基于造纸机干燥部的基本工艺流程对闪蒸罐液位、气罩送风温度和气罩露点温度实施重点监控,并通过S7-300 PLC控制技术对相关环境的车间设备进行自动化控制。在此基础上,通过STEP7软件编辑自动化管理方案运行程序,并采用Win CC组态软件组建终端操作界面。经试验研究发现,所设计的系统终端操作界面友好直观,数据信息交互方便快捷,造纸企业5个月内的平均吨纸汽耗量下降了0.214吨,纸张生产成本进一步降低。

保儿宁口服液联合耳穴贴压治疗小儿反复呼吸道感染肺脾气虚证的临床研究

目的 研究保儿宁口服液联合耳穴贴压治疗小儿反复呼吸道感染肺脾气虚证的临床效果。方法 选择2022年2月至2023年2月江苏省江阴市中医院收治的106例反复呼吸道感染患儿为研究对象,按照随机数字表法将其分为对照组与研究组,各53例。对照组接受保儿宁口服液治疗,研究组在对照组的基础上联合耳穴贴压治疗。两组均治疗8个疗程(6 d为1个疗程)。比较两组临床疗效;比较两组治疗前后中医证候评分、炎症因子、血清学指标、免疫功能;比较两组不良反应发生率。结果 研究组临床疗效优于对照组(P<0.05)。治疗后,两组中医症候评分、肿瘤坏死因子-α、人类β-防御素2低于治疗前,且研究组低于对照组(P<0.05);白细胞介素-2、分泌型免疫球蛋白A、CD3^(+)、免疫球蛋白G高于治疗前,且研究组高于对照组(P<0.05)。两组不良反应总发生率比较,差异无统计学意义(P>0.05)。结论 保儿宁口服液联合耳穴贴压治疗小儿反复呼吸道感染肺脾气虚证效果确切,可改善患儿临床症状、免疫功能,减轻炎症反应,调节血清sIgA、人类β-防御素2表达,且安全可靠。

一测多评法同时测定桑叶中9种绿原酸类和黄酮类成分

目的:建立一测多评法同时测定桑叶中新绿原酸、绿原酸、隐绿原酸、芦丁、异槲皮苷、异绿原酸B、紫云英苷、异绿原酸A和异绿原酸C的含量。方法:采用Agilent TC-C18色谱柱(250 mm×4.6 mm,5μm),以乙腈(A)-0.1%磷酸水溶液(B)为流动相,梯度洗脱,流速1.0 mL/min,检测波长260、320 nm,柱温30℃。以绿原酸为内参物,分别采用外标法和一测多评(多点校正、斜率校正和单点校正)测定桑叶中9个成分的含量并比较4种方法之间的差异,另外采用多点校正和两点校正法进行色谱峰定位,验证该方法的准确性和可行性。结果:新绿原酸、隐绿原酸、芦丁、异槲皮苷、异绿原酸B、紫云英苷、异绿原酸A和异绿原酸C相对于绿原酸的校正因子分别为0.9072、0.8736、0.6207、0.8547、1.1936、0.5501、1.4369和1.2244(多点校正),且在不同条件下相对校正因子耐用性(RSD<1.5%)和重现性(RSD<5%)良好。外标法和一测多评(多点校正、斜率校正和单点校正)测得桑叶中9个成分含量的结果之间无差异(RSD<1.5%)。相较于相对保留时间,多点校正和两点校正可改善色谱峰的准确定位(相对误差|RE|<3%)。结论:建立了桑叶中9种成分的一测多评法,该法准确可行,可用于桑叶的质量控制。

轻质烷烃混合流体固液平衡状态预测与致密化规律

对比分析了多种轻质烷烃类混合流体凝固温度预测模型,发现正规溶液模型具有较高精度。采用该模型分别针对甲烷-乙烷、甲烷-丙烷二元混合流体的凝固温度及密度提升率开展了仿真分析。结果表明,对甲烷-乙烷体系,当甲烷摩尔含量为0.72时,体系达到最低凝固点,温度约72.90 K,相较于三相点纯甲烷,密度提升率为21.62%;对甲烷-丙烷体系,最低凝固温度存在于甲烷含量为0.66时,凝固温度为71.55 K,密度提升率34.48%。采用理想溶液模型预估了甲烷-乙烷-丙烷三元体系的混合特征。结果发现,当混合比为0.63∶0.17∶0.20时,凝固温度降至63.11 K,甲烷推进剂过冷潜能进一步提高。提供了3种混合流体相图,为液甲烷推进剂过冷制备、深度致密化提供了理论支撑。

具有表面张力的流体与运动固体耦合仿真方法

为了提高固液耦合的真实性,提出一种基于物质点法的具有表面张力的流体与运动固体的交互方法.首先使用物质点法仿真框架进行流体仿真,在构建水平集隐式表面并重采样流体表面粒子之后使用连续表面力模型进行流体表面张力的计算;然后通过网格标记定位流体的自由表面与固液接触面,使表面张力计算更加准确;最后使用不同的背景网格分别存储流体和固体的速度场,使用冲量进行碰撞计算,以解决物质点法固液耦合时固有的黏附现象.实验结果表明,所提方法能够更真实地表现流体与运动固体耦合时的细节.