基于UV光固化聚合膜硫氰酸根离子选择性电极的研究

以二丙烯酸脂肪族尿烷酯低聚物为基本原料 ,碘化十二烷基三庚基铵为电活性物质 ,采用 UV光固化聚合成膜研制硫氰酸根离子电位敏感电极。对膜的成分进行了优化 ,优化后的膜与 PVC膜比较具有较高的机械强度和较强的附着力。电极对硫氰酸根离子响应的线性范围为 4.7× 1 0 - 6 ～ 1 .0× 1 0 - 1mol/L,检测下限为 1 .2×1 0 - 6 mol/L ,电极斜率 5 7.5± 1 .5 m V/decade,对常见阴离子电位选择性系数进行了测试 ,电极具有良好的选择性。将电极用于人体尿样中硫氰酸盐的测定 ,结果令人满意     

Ultra compact and fast All Optical Flip Flop design in photonic crystal platform

In this work we present a heterostructure All Optical Flip-Flop configuration based on all optical switching with Kerr nonlinear photonic crystal. In this square-hexagonal structure, we propose three different schemes for the cavities in order to show the trade-off between switching time and triggering power. Loss in the system is reasonably low because of the perfect band gap matching at bending points where two lattices join. The proposed RS-Flip Flop has exceptional features, which make it one of the well optimized and most practical structures to be used in the all optical integrated circuits. The novel design has a fast switching action (on the order of a few picoseconds), and low input power (on the order of 100 mW). Furthermore, high contrast of the output signals for ON and OFF states, can help the easy detection or its coupling to the other devices. The structure is fascinatingly uncomplicated, which results in ultra small dimensions which make it suitable to be placed in an all optical integrated circuit. Besides, we provide a profound analytical view on the functioning of the system, as analyzed by the finite difference time domain (FDTD) method.     

后殖民理论视角下赛译《水浒传》的杂合特征研究

后殖民翻译理论关注隐藏在译文背后的两种文化间的权力争斗和权力运作,认为翻译既是殖民化的途径,也是解殖民化的工具。翻译中的杂合是语言文化交流的必然产物,有利于彰显文化差异、消解文化霸权。赛译水浒对异质性话语的保留使译本呈现出明显的杂合特征。本文拟在后殖民理论视角下,分别从字词、句法、篇章和文化四个层面对赛译水浒的杂合特征进行系统的阐释,旨在发掘赛译水浒的文化价值和文学价值,并阐明其对当下中国文学对外传播过程中的启迪意义。     

Highly Selective All‐Plastic,Disposable, Cu2+‐Selective Electrodes

Conducting polymers (CP) remain a promising material to construct stable potential all‐solid‐state ion‐selective potentiometric electrodes. The unique properties of poly(3,4‐ethylenedioxythiophene) doped with poly(4‐styrenesulfonate) ions, PEDOT‐PSS: high CP stability and affinity of doping anions towards Cu²⁺ ions, make it highly attractive for construction of all‐solid‐state copper(II)‐selective electrodes with outstanding selectivity. The additional benefits can arise from solution processability of commercially available PEDOT‐PSS system. This material was highly promising for a new sensor arrangement, i.e. to obtain disposable, planar and flexible all‐plastic Cu²⁺‐selective electrodes. These sensors can be obtained by casting a commercially available dispersion of PEDOT‐PSS (Baytron P) on a plastic, non‐conducting support material. The CP being both electrical lead and ion‐to‐electron transducer, was covered with plastic, solvent polymeric Cu²⁺ selective membrane. This extremely simple arrangement, after conditioning in dilute Cu²⁺ solution, was characterized with linear Nernstian responses within the activities range from: 0.1 to 10^?4 M, followed by super‐Nernstian responses for lower activities. The latter result points to effective elimination of primary ions leakage from the plastic membrane / transducer phase and has resulted in significantly improved selectivities. Obtained log K values were equal to ?7.6 for Co²⁺, ?7.4 for Zn²⁺, ?7.2 for Ca²⁺ and ?6.8 for Na⁺, respectively.     

Beiträge zur chemie des bors LXXX. Pentacarbonylchromkomplexe von diorganylmethylthioboranene und von 2-diäthylboryl-5-methylthiophen

Substitution of THF by diorganylmethylthiboranes in (CO)₅Cr · THF yields the rather unstable complexes (CO)₅Cr · CH₃SBR₂ (R = CH₃, C₆H₅). In contrast to the σ-thiophene complex (CO)₅Cr · SC₄H₄ the pentacarbonylchromium complex of the σ-S-bonded 2-diethylboryl-5-methylthiopene is quite stable due to interaction of the boryl group with CO ligands.     

Stability Enhancement of All‐Solid‐State H+ ISEs with Cross‐Linked Silicon‐Urethane Matrices

An all‐solid‐state hydrogen‐ion‐selective electrode (ASHISE) was fabricated using the polymer hybrid membrane. Polymer membranes composed of Tecoflex polyurethane (TPU), polyvinyl chloride (PVC), silicon rubber (SR), and additives (KTpClPB, DOA, and TDDA) were cast on a carbon rod. The TPU/SR hybrid membrane exhibited a longer lifetime and a higher sensitivity in the sensing of the H⁺ ion compared to conventional TPU/PVC and PVC/SR hybrid membranes. Moreover, the addition of SiCl₄ to TPU‐based matrices enhanced the potentiometric response and ISE stability, due to the chemical bonding between Si and C?O in urethane, in which the cross‐linking configuration was confirmed by DSC, FT‐IR, and XPS experiments. TPU/SR membranes containing SiCl₄ were rendered more stable and showed a pH response over a wide range (i.e., pH 2–11.5) with the slope of 60±2 mV/pH for more than four months. The ASHISE exhibited a small interfering potential variation in the wide range of the salt concentration (from 1.0×10^?6 M up to 0.1 M). The ASHISE showed a result comparable to a commercial clinical blood analyzer.     

N-[Chloro(dimethylamino)methylene]-N-methylmethanaminium chloride (TMUCl Cl), the reagent of choice for the solid-phase synthesis of anilides

An effective solid-phase preparation of anilides from supported carboxylic acids is described by their activation as the corresponding acid chlorides with TMUCl Cl.     

Ln(GaM2+)O4 and Ln(AlMn2+)O4 compounds having a layer structure [Ln = Lu,Yb, Tm,Er, Ho,and Y,and M = Mg,Mn, Co,Cu, and Zn]

A series of new compounds Ln(GaM²⁺)O₄ and Ln(AlMn²⁺)O₄ having a layer structure were successfully prepared [Ln = Lu, Yb, Tm, Er, Ho, and Y, and M = Mg, Mn, Co, Cu, and Zn]. The synthesis conditions and the unit cell parameters for 23 compounds have been determined. These compounds are isostructural with YbFe₂O₄ (space group $\text{R}\text{3}\text{m, a = 3.455(1)}$ Å, and c = 25.109(2) Å).     

湘西州“种草养羊”富民工程暨肉羊产业发展模式（Ⅰ）——基础、优势及问题

湘西土家族苗族自治州“种草养羊”富民工程暨肉羊产业发展不仅已具有较好的群众思想基础和领导组织基础，而且也已具备一定的市场、技术和产业基础；发展“种草养羊”肉羊产业，湘西州不仅具有资源与政策优势，还具有市场、区位和环境优势，然而，制约湘西州肉羊产业发展的因素也是不容忽视的.     

二维各向同性谐振子的升,降算子

本文利用二维各向同性谐振子在粒子数表象中的升、降算子，推导出在坐标表象中二维各向同性谐振子的升、降算子，本文所用方法简单、直观，很容易求出在坐标表象中升、降算子的表示形式。