Highly [010]-oriented,gradient Co-doped LiMnPO4 with enhanced cycling stability as cathode for Li-ion batteries

Journal of Solid State Electrochemistry - LiMnPO4 has been attracting attention for high energy density (701 Wh kg−1) and excellent safety. However, LiMnPO4 suffers from the...     

Mercury forms and their transformation in pyrite under weathering

Pyrite is considered to be the major carrier of mercury in coal. Here, the chemical characteristics of two natural pyrite samples of different weathering degrees were characterized by time-of-flight secondary ion mass spectrometry (TOF-SIMS). Thermal stability of Hg was also analyzed via temperature programmed desorption experiment (TPD). Characteristic ions such as S⁻, Fe⁺, FeS⁻, and FeS₂⁻ were detected on the surface of fresh pyrite. The release temperature of Hg ranged between 180°C and 300°C, and the characteristic peak of black HgS was recorded. In addition, abundant Fe₂O₃⁻, FeSO⁻, SO₄⁻, and HSO₄⁻ were detected on the surface of weathered pyrite, and the release temperature of Hg therein was mainly distributed at 260°C to 380°C and 520°C to 600°C, corresponding to the characteristic peaks of red HgS and HgSO₄, respectively. The results show that pyrite is acidified during weathering and that Hg forms in pyrite are transformed from the original state (HgS) to HgSO₄.     

聚苯胺/H2W2O7层状复合材料的制备研究

以层状钨基氧化物(H2W2O7)为无机主体, 用正庚胺改性后的正庚胺/H2W2O7复合物(HTT)为中间体, 通过离子交换、层间O2引发聚合等步骤成功制备了聚苯胺/H2W2O7层状复合材料(PANI/H2W2O7). X射线衍射、扫描电子显微镜、红外光谱及差热分析结果表明: 聚苯胺分子已成功地嵌入H2W2O7层间, 层状结构没被破坏, 层间距变至1.19 nm; 聚苯胺的嵌入还大大提高了材料的热稳定性. 讨论了无机主体与有机客体之间的相互作用、聚苯胺在层间的排布形式及苯胺和聚苯胺插入层间的反应机理.     

耦合耗散Klein-Gordon-Schr■dinger方程组的整体吸引子(英)

本文考虑通过Yukawa相互作用的耦合耗散Klein－Gordon－Schrodinger方程组的初边值问题，证明了整体吸引子的存在性。     

关于半线性热方程的死角性质

本文考虑下述问题：这里，．本文证明了在发生死角时只有有限个死角点．     

纳米氧化锌的乳液合成、结构表征与气敏性能

利用化学沉淀法、乳液法及微乳液法合成了不同晶粒尺寸的纳米氧化锌气敏材料；用X射线衍射和透射电镜、研究了材料的晶体结构和陶瓷微结构，并利用科西-科西法和德拜-谢乐法计算了材料的平均晶粒度和晶格畸变；和静态配气法测试了材料对乙醇、汽油、氢气、丁烷、六氟化硫的气体灵敏度。实验结果表明：微乳液法和阴离子表面活性剂乳化法合成的氧化锌具有颗粒小，气体灵敏度高和工作温度低的特点。     

Isobaric vapor liquid equilibria data for the binary system (glycidyl butyrate + acetone,glycidyl butyrate + carbon tetrachloride,glycidyl butyrate + chloroform) at atmospheric pressure 101 kPa

Isobaric vapor liquid equilibria (VLE) for the binary mixtures of glycidyl butyrate(1) + acetone(2), glycidyl butyrate(1) + carbon tetrachloride(2) and glycidyl butyrate(1) + chloroform(2) at 101 kPa were studied. The experimental data were satisfactorily correlated with the models of Wilson, NRTL and UNIQUAC activity coefficients. The activity coefficients for the equilibrium data were obtained by the nonlinear least square method. The average relative deviations between experimental temperatures and calculated temperatures by the Wilson, NRTL and UNIQUAC models were 0.16, 0.16, 0.23% for glycidyl butyrate(1) + chloroform( 2), 0.38, 0.12, 0.27% for glycidylbutyrate(1) + carbon tetrachloride(2), and 0.67, 0.13, 0.54% for glycidyl butyrate(1) + acetone(2). Azeotrope behavior was not found for these systems. The thermodynamic consistency of the correlations was checked by the Herrington’s area test.     

Novel Photochemical Hydrolysis of o-Acetylphenylacetonitriles to Amides

Irradiation of o-acetylphenylacetonitriles 1a,b in methanol (lambda >280 nm) leads to essentially quantitative photohydrolysis with formation of the corresponding ketal amides 3a,b. The mechanism proposed for this novel reaction is supported by the qualitatively different photochemical behavior of 1c and by a labeling experiment with 1a-L that confirms transfer of the carbonyl oxygen atom of 1a to the amide oxygen atom of 3a.     

PCS-环与扩张

结合ACS环和p.q-Baer环的定义,本文将p.q-Baer环推广到PCS环,这样在p.q-Baer环和ACS环之间存在一类新的环,PCS环.环R称为PCS-环,如果R的每个主理想的右零化子作为右理想在一个由幂等元生成的右理想中是本质的.PCS-环包括所有的右p.q-Baer环,所有的右FI-扩展环,以及所有的交换的ACS-环.通过研究环主右理想的零化子的性质和模的本质子模的性质,研究了三种环之间的关系,推广了p.q-Baer环的结果,得到了ACS环所没有的结果,同时研究了环的扩张问题,证明了强PCS性质是Morita等价性质.     

Synergistic flame-retardant effects of ammonium polyphosphate and AC-Fe2O3 in epoxy resin

Journal of Thermal Analysis and Calorimetry - The synergistic flame-retardant and smoke suppression properties of ammonium polyphosphate (APP) and activated carbon-supported Fe2O3 (AC-Fe2O3) on...