Carbon-SO3H catalyzed expedient synthesis of new spiro-[indeno[1,2-b]quinoxaline-[11,2′]-thiazolidine]-4′-ones as biologically important scaffold

In this report, we have described a convenient and eco-compatible approach for synthesis of new hybrid spiro[indeno[1,2-b]quinoxaline-[11,2′]-thiazolidine]-4′-ones (4a–k) via multi-component reaction of indeno[1,2-b]quinoxalinone, α-mercaptocarboxylic acids and various types of amines using urea-choline chloride as green deep eutectic solvent and carbon-SO₃H as a solid acid catalyst. This new protocol produces a thiazolidine ring attached to indeno[1,2-b]quinoxaline through spiro carbon in good to excellent yields. The advantages of this protocol are avoidance of toxic and harmful catalyst and solvents further both catalyst and DES were recovered from the reaction mixture quantitatively and reused several times. Synthesized compounds were characterized on the basis of spectral and single crystal X-ray analysis. The prepared catalyst was characterized by FT-IR, SEM, and X-ray diffraction method.     

Scheme for Preparation of Macroscopic Multi-component Entanglement in Cavity QED

We propose a scheme of generating multi-component entangled coherent states of cavity fields. In this scheme, the atoms pass through cavities one by one, simultaneously driven by a strong classical field in each cavity. Then the detection of the atomic states collapses the cavity fields onto multi-component entangled coherent states. It is shown that, with a judicious choice of the parameters of the classical field, we can conditionally produce macroscopic multi-dimensional maximal entanglement for the cavity modes.     

Fe-Cr-V-Ni-Si-C系多元合金的原子间互作用势的构建及应用

使用第一性原理赝势方法及量子化学从头算方法计算的物理量以及最小二乘法拟合的数据构建了多元合金Fe-Cr-V-Ni-Si-C系的原子间互作用势，并利用该原子间互作用势计算了实验合金N5(Fe9.07Cr7.56V0.8Ni0.49 Mo0.96Mn1.52Si3.3C)，N6(Fe9.65Cr7.72V1.17Ni0.50Mo0.91Mn1.42Si3.3C)，N7(Fe9.81Cr7.65V1.58Ni0.46Mo0.86Mn1.35Si3.3C)，N8(Fe10.05Cr7.59V2.24Ni0.40M     

大介电常数地层中多分量感应测井响应研究

研究大介电常数对多分量感应测井的影响,并通过不同磁场分量的组合量来同时提取地层电阻率和介电常数以及地层纵向边界信息,实现地层参数的重构,直观识别烃源岩地层. 关键词： 多分量感应测井 大介电常数 组合量 直观解释     

Dielectric and visco-elastic properties of laterally fluorinated liquid crystal single compounds and their mixture

The physical properties of three laterally fluorinated liquid crystalline compounds with negative dielectric anisotropy have been studied from static dielectric permittivity, optical birefringence, bend elastic constant, relaxation time and rotational viscosity measurements. Such negative dielectric anisotropy materials find use as components of mixtures for application in vertically aligned mode liquid crystal displays. Moreover, the physical properties of one phenyl cyclohexane compound with positive dielectric anisotropy have also been studied. A five-component mixture comprising these four mesogens and a non-mesogenic component has been formulated and its physical properties have been thoroughly investigated. An attempt has been made to strike a balance between the optical birefringence of the mixture to adjust the cell gap and the dielectric anisotropy and threshold voltage (V_th ) to ensure low driving voltages. The pretilt angle effect on the threshold voltage and the relaxation time has also been studied. At T?=?20°C, the response time decreases to 22% and 41% for the mixture for 2° and 5° pretilt as compared to zero pretilt. On the other hand, at the same temperature the V_th values are decreased by 5% and 9%, respectively.     

多分量退化的 CH型方程的可积性及其解

研究了M¨untz 有理函数在加权Orlicz 空间内的逼近性质,证明了它在Orlicz 空间内的有界性,利用加权连续模、K-泛函、Hardy-Littlewood 极大函数、H¨older 不等式给出了该有理函数在Orlicz 空间内的加权逼近性质。     

多组分传质过程的Maxwell-Stefan方法模拟

为定量研究多组分系统在多孔介质内传质过程中组分之间的交互作用现象,本文基于Maxwell-Stefan模型对CH₄/Ar/H₂混合气体在单个直孔道内的纯扩散过程和C₂H₆/C₃H₈/N₂混合气体在活性炭上的吸附扩散过程进行了模拟,定量地描述和分析了多组分系统中组分之间在传质过程中的交互作用。研究表明:对于扩散过程,组分之间的交互作用表现为大分子对小分子的拖带;对于吸附过程,这种作用表现为强吸附质能够替代已被吸附在吸附剂表面的弱吸附质;主体扩散为主要的传质形式。