造纸污泥与废水污泥流化床焚烧时NO_x和SO_2的排放特性研究

1前言流化床焚烧污犯是近年来发达国家广泛采用的方法，它能很好地实现污泥的稳定化、无害化、减容化和资源化处理。燃煤流化床锅炉污染物排放方面已做了大量的研究工作，由于污泥与煤在结构和性质方面的差异较大，因此有必要对流化床焚烧污泥时污染物排放特性进行研究。本文详细研究了造纸、废水污泥在流化床中焚烧时污泥水份、运行床温及过量空气对NO。和SO。的排放特性及污泥N－＋NO。、S－SO。的转化率的影响，并对这两种性质差异较大的污泥焚烧时的NO。和502的生成特性进行了对比分析，取得了许多有价值的结果，为污泥流化床焚烧…     

直接甲醇燃料电池阴极电催化剂的研究进展

直接甲醇燃料电池(DMFC)功率密度高，燃料甲醇价格低廉、储存和携带方便，特别适合作为电动车和小型电子设备的电源，是目前燃料电池研究领域的一个热点。本文介绍了40年来DMFC阴极电催化剂的发展历史及现状，并针对目前严重影响DMFC性能的“甲醇透过”问题，阐述了研制耐甲醇阴极电催化剂的重要性，讨论了今后DMFC阴极电催化剂的发展趋势。     

抗坏血酸-铁(Ⅱ)络合反应在薄层色谱板上的吸收光谱

本文利用薄层色谱板上吸收光谱研究了抗坏血酸与铁（Ⅱ）离子在不同pH值和不同配比溶液中络合反应情况，并对抗坏血酿-铁（Ⅱ）螯合物的结构进行了探讨。     

Simultaneous determination of ten organophosphate pesticide residues in fruits by gas chromatography coupled with magnetic separation

In this study, γ‐Fe₂O₃/chitosan magnetic microspheres were synthesized and evaluated by X‐ray diffraction, SEM, thermogravimetric analysis, and static and kinetic adsorption experiments. Results showed that the magnetic microspheres exhibited good adsorption ability, and offered fast kinetics for the adsorption of trichlorfon, methamidophos, malathion, methyl parathion, dimethoate, omethoate, phosphamidon, phorate, isocarbophos, and chlorpyrifos. Based on magnetic separation, a simple method of magnetic SPE coupled to GC for the simultaneous determination of ten trace organophosphate pesticide residues was developed. Under the optimal conditions, the enrichment factor for ten organophosphorus pesticides was 10.1–364.7 and linear range was 0.001–10.0 mg/L. The LOD (S/N = 3) of the method for the ten pesticides was 0.31–3.59 μg/kg. The RSD for three replicate extractions of spiked samples was between 2.5 and 6.3%. The pear and apple samples spiked with ten organophosphate pesticides at 20 and 200 μg/kg levels were extracted and determined by this method with good recoveries ranging from 79.9 to 98.7%. Moreover, the method has been successfully applied for the determination of the ten organophosphate pesticide residues in peach samples.     

Compressive Mass Analysis on Quadrupole Ion Trap Systems

Conventionally, quadrupole ion trap mass spectrometers eject ions of different mass-to-charge ratio (m/z) in a sequential fashion by performing a scan of the rf trapping voltage amplitude. Due to the inherent sparsity of most mass spectra, the detector measures no signal for much of the scan time. By exploiting this sparsity property, we propose a new compressive and multiplexed mass analysis approach—multi Resonant Frequency Excitation (mRFE) ejection. This new approach divides the mass spectrum into several mass subranges and detects all the subrange spectra in parallel for increased mass analysis speed. Mathematical estimation of standard mass spectrum is demonstrated while statistical classification on the parallel measurements remains viable because of the sparse nature of the mass spectra. This method can reduce mass analysis time by a factor of 3–6 and increase system duty cycle by 2×. The combination of reduced analysis time and accurate compound classification is demonstrated in a commercial quadrupole ion trap (QIT) system.

菲的电解还原

菲的电解还原胡明，刘旭光，王志忠（太原工业大学，太原０３００２４）关键词菲，有机电化学，电解还原近年来有机电解技术引入煤转化领域的研究已有过一些综述￣［１～６］。以多环芳烃为模型化合物，研究其在电解条件下的转化行为，从理论和实践上都将为煤及其加工产品...     

a-二芳甲基-b-羰基硫代羧酸酯与肼的环合反应：官能化含5-羟基吡唑基的三芳基甲烷类化合物的合成

本文研究了合成官能化含5-羟基吡唑基的三芳基甲烷类化合物的a-二芳甲基-b-羰基硫代羧酸酯与肼的环合反应。研究表明,在乙醇介质中,回流条件下, a-二芳甲基-b-羰基硫代羧酸酯与肼能有效进行环合反应,高产率制得5-羟基吡唑基三芳甲烷类化合物。该反应条件温和,产率高,操作简单。     

基于改进MP-WVD算法的核电厂建设爆破振动信号处理方法

针对爆破施工产生的振动问题,结合现有信号分析方法优缺点,引入MP-WVD组合算法解决信号分析过程中交叉项干扰问题,可提高时频分辨率,满足精确提取核电爆破振动响应信号时频分布特征的需求;将HHT算法引入MP算法数据的预处理,成功降低了MP算法运算复杂度,可为大数据量分析奠定基础。运用该算法对漳州核电一期工程场地平整土石方爆破工程振动监测信号进行分析,精确提取了爆破振动信号的时频特征。     

On the Boltzmann Equation for Fermi–Dirac Particles with Very Soft Potentials: Averaging Compactness of Weak Solutions

The paper considers macroscopic behavior of a Fermi–Dirac particle system. We prove the L ¹-compactness of velocity averages of weak solutions of the Boltzmann equation for Fermi–Dirac particles in a periodic box with the collision kernel b(cos θ)|ρ−ρ _*|^γ, which corresponds to very soft potentials: −5 < γ ≤ −3 with a weak angular cutoff: ∫₀ ^π b(cos θ)sin ³θ dθ < ∞. Our proof for the averaging compactness is based on the entropy inequality, Hausdorff–Young inequality, the L ^∞-bounds of the solutions, and a specific property of the value-range of the exponent γ. Once such an averaging compactness is proven, the proof of the existence of weak solutions will be relatively easy.