Negative‐working photoresist based on a first‐generation dendrimer consisting of 4,4‐diphenylpentyloxy units

A first‐generation dendrimer ( 2 ), containing phenol groups in the exterior for solubilization in aqueous alkaline solutions, was evaluated as a new negative‐working, alkaline‐developable photoresist material. A negative‐working photoresist based on 2 , 4,4′‐methylenebis[2,6‐bis(hydroxymethyl)phenol] as a crosslinker, and diphenyliodonium 9,10‐dimethoxyanthracene‐2‐sulfonate as a photoacid generator was demonstrated. This resist gave a clear negative pattern through postbaking at 90 °C after exposure to UV light, which was followed by development with a 2.38% aqueous tetramethyl ammonium hydroxide solution at room temperature. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 1210–1215, 2005     

氧分子离子第一负带系(b4∑g--a4∏u)(2,6)带的光谱测量与分析

采用光外差-速度调制分子离子吸收光谱技术,在近红外波段13170~13500 cm-1范围内,对氧分子离子第一负带(b4∑g--a4∏u)(2,6)带进行测量和分析,有关第一负带(2,6)带光谱测量尚未见文献报道.本文简述了光外差-速度调制光谱技术的特点,同时给出了对复杂四重态跃迁谱带的分析,运用非线性最小二乘拟合获得了该跃迁上下态精确的分子常数.     

Magnetoresistances and magnetic entropy changes associated with negative lattice expansions in NaZn13-type compounds LaFeCoSi

Magnetoresistances and magnetic entropy changes in NaZn13-type compounds La（Fel-xCox）11.9Si1.1 （x=0.04, 0.06, and 0.08） with Curie temperatures of 243 K, 274 K, and 301 K, respectively, are studied. The ferromagnetic ordering is accompanied by a negative lattice expansion. Large magnetic entropy changes in a wide temperature range from ～230 K to ～320 K are achieved. Raising Co content increases the Curie temperature but weakens the magnetovolume effect, thereby causing a decrease in magnetic entropy change. These materials exhibit a metallic character below Tc, whereas the electrical resistance decreases abruptly and then recovers the metal-like behaviour above Tc. Application of a magnetic field retains the transitions via increasing the ferromagnetic ordering temperature. An isothermal increase in magnetic field leads to an increase in electrical resistance at temperatures near but above Tc, which is a consequence of the field-induced metamagnetic transition from a paramagnetic state to a ferromagnetic state.     

Tb2Fe15.5Cr1.5化合物的本征磁致伸缩

通过x射线衍射及磁测量手段研究了Tb₂Fe_15.5Cr_1.5化 合物的热膨胀性质及本征磁致伸缩性质.研究结果表明Tb₂Fe_15.5Cr _1.5化合物在293—672K的温度范围内具有六角相的Th₂Ni_{17型结构.在432—522K的温度范围内具有负热膨胀 性质，其平均热膨胀系数=-157×10^-5/K.对本征磁致伸缩的研究结果表明Tb2Fe15.5Cr1.5化合物中存在着较强的各向异性的本 征磁致伸缩，293K时其本征体磁致伸缩约为84×10^-3，晶格畸变主要发生在c 轴方向上.磁测量研究结果表明Tb2Fe15.5Cr1.5化合物的居里温度约为494K，比其母 合金Tb2Fe17高约80K.}     

One Hundred and Eighty-nine Homeomorphism Classes of the G. M. 

InG.M.@,asshowedinfigure1,alltheedgescanbedividedintothreetiers:innertierABCDEA,outertierA'B'C'D'E'A'andmiddletierAD'BE'CAIDBIEC'A(radiationedges).Bytwistingwepushthenegativeedgesininnertierand0utertierintothemiddletierasfaraspossible.IfDEisanegativeedge,wecantwistD,tomakeitbecameap0sitiveedgelifCDturnedint0thenegativeedge,wecantwistCt0makeitbecometheP0sitiveedge,ands00n.Atlast,ifABisanegativeedge,twistA,tomakeitbecomeaPOsitiveedge.Inthisway,excepttheedgeAEcouldbePOsitiveorne…     

托卡马克等离子体不同运行模式下的电子回旋波电流驱动

在给定等离子体密度分布下，从电子、离子的能量方程出发，根据不同运行模式下等离子体的热传导率不同，分别求出了中心负剪切模式，常规剪切H模式和L模式下的等离子体温度分布，然后通过求解波迹方程与相对论情况下的Fokker-Planck方程，分别计算了这些模式下的电子回旋波电流驱动和波功率沉积.得到在中心负剪切下，驱动电流最大，驱动效率最高，功率沉积和电流分布区间跨度大；在常规剪切H模式下，驱动电流较小，分布区间跨度比较窄，驱动效率相对较低；在常规剪切L模式，驱动电流效率最低，分布区间跨度也非常集中. 关键词： 托卡马克 电子回旋波电流驱动 中心负剪切 常规剪切     

FIRST ORDER NONLINEAR DIFFERENTIAL INEQUALITIES WITH DEVIATING ARGUMENTS

Abstract. In this paper ,some new properties of solutions of the first order nonlinear differential inequalities with deviating arguments are given. These results improve many corresponding ones in the literature.     

电场中介质微粒的荷电机理与实验控制模型

对中性介质微粒在电场中荷电的物理过程进行了探索，对其电晕的产生、负离子分子的形成和介质微粒的荷电三个子过程的机理进行了描述，结合实验教学中几个重要问题建立了实验控制模型。     

Nonresonant Nonlinearity of Silver Nanoparticles

Results of experimental investigations of the process of nonlinear refraction in composite materials based on silver nanoparticles in the region far from the plasma surface resonance of the nanoparticles (λ = 1064 nm) are presented. The reflection Z-scanning technique was used for measurements, which made it possible to determine both the sign and the values of nonlinear refractive indices and real parts of the 3rd-order nonlinear susceptibility of composite materials. The mechanism responsible for the process of nonlinear refraction in specimens is discussed. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 5, pp. 650–653, September–October, 2005.     

Characterization of optical and nonlinear optical properties of silver nanoparticles prepared by laser ablation in various liquids

The optical, structural, and nonlinear optical properties of silver nanoparticles prepared by laser ablation in various liquids were investigated at 397.5, 532, and 795 nm. The TEM and spectral measurements have shown temporal dynamics of size distribution of Ag nanoparticles in solutions. The thermal-induced self-defocusing dominated in the case of high pulse repetition rate as well as in the case of nanosecond pulses. In the case of low pulse repetition rate, the self-focusing (γ = 3 × 10⁻¹³ cm² W⁻¹) and saturated absorption (β = −1.5 × 10⁻⁹ cm W⁻¹) of picosecond and femtosecond radiation were observed in these colloidal solutions. The nonlinear susceptibility of Ag nanoparticles ablated in water was measured to be 5 × 10⁻⁸ esu (at λ = 397.5 nm).