Accurate correction of arbitrary spin fermion quantum tunneling from non-stationary Kerr-de Sitter black hole based on corrected Lorentz dispersion relation

According to a corrected dispersion relation proposed in the study on the string theory and quantum gravity theory, the Rarita-Schwinger equation was precisely modified, which resulted in the Rarita-Schwinger-Hamilton-Jacobi equation. Using this equation, the characteristics of arbitrary spin fermion quantum tunneling radiation from non-stationary Kerr-de Sitter black holes were determined. A number of accurately corrected physical quantities, such as surface gravity, chemical potential, tunneling probability, and Hawking temperature, which describe the properties of black holes, were derived. This research has enriched the research methods and enabled increased precision in black hole physics research.     

CuCl2/NaY体系表面分散态研究

铜负载分子筛作为催化剂或吸附剂，在石油化工、环境保护等方面有许多用途[1，2]．已有研究发现，铜交换的Y型分子筛对NO分解等反应具有较高活性及稳定性［3-5］．因此研究铜负载Y型分子筛对有关吸附剂和催化剂的制备有重要意义．我们实验室在研究活性组分在载体表面分散现象时     

Complications in the Use of the Taylor Dispersion Method for Ternary Diffusion Measurements: Methanol + Acetone + Water Mixtures

The Taylor dispersion technique is used to measure the ternary mutual diffusion coefficients of aqueous nonelectrolyte solutions at 25°C. The dispersion of the injected solutes is recorded by a differential refractometer and an ultraviolet-visible detector. The diffusion coefficients are calculated directly by fitting the theoretical dispersion equations to about six experimental curves simultaneously. If the ternary diffusion effects in the measured dispersion profiles are not confused by the inaccuracy of the experimental method or an unfavorable relative detector sensitivity, the diffusion coefficients are precise. For the system methanol + acetone + water, it is shown that the Taylor dispersion method is unsuitable for the determination of all the diffusion coefficients if the methanol mole fraction is less than 0.45 or the acetone mole fraction if more than 0.001.     

氧化物表面单层改性对SnO2超微粒子热稳定性的影响

研究了氧化物在气敏材料二氧化锡超细粉表面的分散行为及分散量的二氧化锡热稳定性的影响,结果表明,氧化铜,氧化镍,氧化铋和氧化锌在二氧化锡表面均能单层分散,分散阈值均与按密置单层模型计算的最大分散容量相符,负载二氧锡的表面覆盖度与其稳定性之间有很好的对应关系,单层覆盖率达到一定程度二氧化锡高温烧结便可基本得到抑制。     

富缺陷BN负载的高分散Cu催化乙醇脱氢制乙醛

生物乙醇作为平台分子通过催化转化的方法可以制备烯烃、乙醛、丁醇和芳香化学品等,其中乙醛是生产乙酸、季戊四醇、三氯乙醛、山梨酸等重要化学品的原料.随着乙醛的需求量逐年增加,发展以乙醇直接脱氢生成乙醛的工艺,具有联产氢气、原子经济性高、产物易分离的优点,符合国际绿色低碳发展战略要求,有望替代当前乙烯氧化法生产工艺.乙醇分子...     

水性乳液/聚氨酯模型缔合增稠剂的触变性机理

以异佛尔酮二异氰酸酯(IPDI)与聚乙二醇(PEG, 分子量为4000, 6000和8000)为原料, 以直链醇(C12, C14, C16和C18)为封端剂, 合成了疏水改性乙氧基化氨基甲酸酯(HEUR), 并将其应用于乳液增稠. 采用核磁共振波谱(¹H NMR)、 傅里叶变换红外光谱(FTIR)及凝胶渗透色谱(GPC)表征了HEUR的结构、 分子量及其分布, 研究了其在水性乳液中的流变行为. 研究结果表明, 当HEUR封端基团为C14, C16和C18, 且质量分数增加到1.0%以上时, 增稠的乳液(Latex/HEUR)的流变曲线出现触变环, 为触变性流体. 当HEUR亲疏水比值(R_h)减小时, 疏水性增强, 触变环向低剪切速率( \dot{\gamma } )方向移动, 黏度下降率(Δη)增大; 当HEUR用量增加时, 触变环面积(S_loop)也增大. 这些触变性特点归因于HEUR在乳液中的缔合作用、 氢键作用及链缠结. 利用扫描电子显微镜(SEM)和原子力显微镜(AFM)对Latex/HEUR的聚集态和表面形貌进行了表征. 结果表明, 随着HEUR封端基团链长增加, Latex/HEUR颗粒粒径增大, 表面变粗糙.     

可视化分析方法在薄膜基材料荧光传感中的应用

随着光学成像技术的不断突破,荧光可视化已经从简单的肉眼观察逐步向宽场显微、共聚焦显微、超分辨成像等方向发展.然而,荧光可视化在薄膜基材料中的传感应用依然以肉眼观察以及少量的宽场显微为主要分析手段.同时,薄膜基材料结构和性质的可视化分析研究也滞后于荧光可视化技术的发展.基于此,结合本课题组近几年的研究成果,本文系统评述了荧光共聚焦显微技术在薄膜基材料体相分散状态和表面性质的可视化分析中的应用进展,并对当前薄膜基荧光传感材料面临的问题和可能的解决方案进行了简要探讨.     

Quantitative analysis of MWCNT agglomeration in polymeric‐based membranes using atomic force microscope

In this work, we performed an analysis on the surface properties of polyethersulfone (PES)‐based ultrafiltration membranes that were prepared by incorporating acid functionalized multiwalled carbon nanotube (f‐MWCNT) and polyvinylpyrrolidone into membrane matrix via simple blending method. The bonding‐chemistry of the nanocomposites implanted within the PES membrane was investigated by Fourier transform infrared spectrometer while atomic force microscope was employed to observe the distribution of f‐MWCNT in the membrane matrix and further measured its agglomeration quantitatively. The resultant 3D atomic force microscope images provided the most satisfactory way to examine the distribution of nanomaterials in the membranes, and with the help of ‘point profile data’ the maximum height and width of the agglomerated cluster could be quantitatively calculated. Moreover, the surface profile studies of the membrane surface provided the information about the length, volume, area, perimeter, radius and diameter of grains. It was observed that PES/nanocomposite blended membranes were held together via strong hydrogen bonding, but poor dispersion of MWCNT in the membrane matrix reduced the membrane performance in terms of protein (pepsin and bovine albumin serum) rejection and increased the surface roughness. Copyright © 2016 John Wiley & Sons, Ltd.     

不同松香改性树脂对农药可分散油悬浮剂物理稳定性的影响

研究了添加松香及其改性氢化松香甘油酯、氢化松香季戊四醇酯、松香改性对特辛基苯酚树脂对以油酸甲酯为介质的12.5%氰霜唑·吡唑醚菌酯可分散油悬浮剂物理稳定性及流变特性的影响。傅里叶变换红外光谱表征结果表明,与松香酸相比,氢化松香甘油酯、氢化松香季戊四醇酯和松香改性对特辛基苯酚树脂的羧基吸收峰消失且出现酯基的特征吸收峰。实验中,随加成烷基醇碳链的延长,软化点升高。且随着树脂的质量分数增加,制剂的粘度提高,物理稳定性也相应提高(析油率降低)。流变结果表明,添加松香改性树脂的可分散油悬浮剂体系呈正触变性,且树脂种类对体系的屈服值影响较大,具体表现为:松香改性对特辛基苯酚>氢化松香季戊四醇酯>氢化松香甘油酯>松香,制剂的物理稳定性也呈现相同的趋势。因此,松香改性树脂具有作为可分散油悬浮剂物理稳定剂的应用潜力。     

Flexural,impact, rheological and physical characterizations of POM reinforced by carbon nanotubes and paraffin oil

The paraffin oil dispersion technique innovated in the recent years to synthesize bulk polymer nanocomposite materials has a uniform dispersion. This research work aims to study the effect of added carbon nanotubes (CNTs) on flexural, impact and rheology behaviors of polyoxymethylene (POM) reinforced by 0–0.03 wt% of CNT using paraffin oil dispersion technique. The wettability and lamellar thickness were measured and rheological performance investigated using a parallel plate rheometer. The flexural and impact mechanical properties were also evaluated. The fracture surfaces were then examined by microscopy. The results showed that the energy to break, flexural strength and modulus increased proportionally with the addition of the amount of CNT in the matrix. For the rheology behavior, the viscosity decreased at the low percentage of CNT and then increased with increase in the percentage weight ratio of CNT in the POM matrix. It was also noted that the water contact angle rose with the increase the CNT percentages. Copyright © 2016 John Wiley & Sons, Ltd.