Associated productions of the new gauge boson BH in the Littlest Higgs model with a SM gauge boson via e+e- collision

With the high energy and luminosity, the planned ILC has the considerable capability to probe the new heavy particles predicted by the new physics models. In this paper, we study the potential to discover the lightest new gauge boson BH of the Littlest Higgs model via the processes e+e- →γ(Z)BH at the ILC. The results show that the production rates of these two processes are large enough to detect BH in a wide range of the parameter spaces, specially for the process e+e- →γBH. Furthermore, there exist some decay modes for BH which can provide the typical signal and clean backgrounds. Therefore, the new gauge boson BH should be observable via these production processes with the running of the ILC if it exist.     

Preparation of highly sensitive sensors based on polystyrene microspheres for the detection and removal of Hg2+ ions

Detection and the simultaneous removal of mercury ions are of vital importance. In this study, fluorescent monomers, small molecular sensors, were first synthesized using 4‐bromo‐naphthalic anhydride as precursor. These double bond bearing sensors were then grafted to polystyrene (PS) microspheres through dispersion polymerization. The sensors still retained their detecting ability when they were anchored on the surfaces of PS microspheres. Upon the addition of Hg²⁺ ions to the PS microspheres, both the color and the fluorescence intensity changed, which could be employed to detect Hg²⁺ ions. The absorption capacity of the two kinds of PS microspheres reached 0.557 mg g^?1 and 0.628 mg g^?1 respectively. The PS microspheres still remain their fluorescence and absorption even used for five times. These polymeric highly sensitive chemosensors may see their applications in purification of polluted environments. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013 , 51, 4592–4600     

Viscosity Behaviors of Rapidly Curable Silica Sols

The viscosity behaviors of rapidly curable transparent silica aerogels, such as time at the onset point and the slope of viscosity increase, are investigated as functions of target density, water and catalyst content. Results were compared with the visually measured gel time. The effects of temperature and shear rate on the onset point and rate of the viscosity increase are also investigated with the selected samples. Experimental design and result analysis were also conducted using the Design of Experiment (DOE) method, and the Arrhenius relation was applied to predict the temperature dependence of viscosity. It is found that the target density and catalyst content played more important roles in determining gelation and viscosity behavior than water content did. As the target density increased, the gel time and the onset point appeared at significantly earlier times and the slope increased more rapidly, while there existed an optimum catalyst and water content for fast gelation and desirable viscosity behaviors. The temperature dependence of the viscosity behaviors of rapidly curable transparent silica sols can be expressed by the Arrhenius relation. The onset time of viscosity increase was little affected by the shear rate at a low shear rate range of up to 1.32 s⁻¹, and after that it linearly decreased with increasing shear rate, while the slope of viscosity increase continuously decreased with increasing shear rate. Overall, the viscosity measurement appears as a simple and reliable method for quantitatively measuring gel time, especially for the rapidly curable sol–gel process.     

Gleeble-3800热模拟试验机故障的检测及处理

介绍了Gleeble-3800热模拟试验机运行一年来陆续出现的一些故障及对故障的排查过程和解决方法.     

夏克-哈特曼波前传感器的波前相位探测误差

对夏克－哈特曼（Ｓｈａｃｋ－Ｈａｒｔｍａｎｎ）波前传感器的相位探测误差进行了分析,并分析了它的政论相位探测极限,分析结果表明,夏克－哈特曼波前传感器的相位探测精度与探测器的噪声水平,探测目标的亮度有关,还与被探测对象的特性、孔径波前分割有关。给出了它们的关系表达式。     

Characterization of rapidly and naturally quenched skeletal iron catalysts for FT synthesis

The slurry phase is a promising system for Fischer-Tropsch (FT) synthesis. Since the liquid medium efficiently removes the heat of reaction so that the steady-state reaction is easily achieved. High catalytic activity is maintained due to removal of waxy products from the catalyst surface by the action of solvent. In addition, CO-rich syngas from coal gasification can be directly used in FT synthesis which may increase the thermal efficiency of the indirect coal liquefaction. One of the important problems to be solved for slurry phase FT is the catalyst attrition and separation from wax residue. Fused iron and Raney iron were found to have high attrition resistance and easy to separate from wax in slurry phase FT synthesis, but their activity is relatively low. Amorphous alloys made by rapid quenching techniques have drawn increasing interest due to their superior mechanical,chemical and magnetic properties compared to the thermodynamically stable crystalline alloys of the same compositions. It is reported that rapidly quenched skeletal Ni catalyst showed higher catalytic activity than Raney Ni in selective hydrogenation of unsaturated organic functional groups.In this paper, Fe50Al50 (by weight) alloys with different quenching rates, rapid quenching (RQ) and natural quenching (NQ) were prepared for FT synthesis. The phase composition of alloys was characterized by XRD. The physical properties, thermal-stability and adsorption properties of skeletal Fe that was prepared by leaching aluminum of the corresponding alloy with aqueous solution of NaOH were also studied by BET, in situ XRD and H2- and CO-TPD. It is found from XRD patterns of the alloys that RQ Fe50Al50 is composed of orthorhombic phase, and NQ Fe50Al50 alloy is mainly composed of monoclinic phase. Meanwhile, diffraction peaks of the RQ alloy are seriously broadened. After leaching aluminum by aqueous solution of NaOH at the same conditions,skeletal Fe from the RQ alloy give the higher specific surface area and larger pore volume. The in -situ XRD shows that skeletal Fe from RQ alloy is composed of elemental iron and magnetite (FeFe2O4) with poor crystalline. The skeletal Fe from NQ alloy is mainly composed of elemental Fe and minor magnetite. The higher content of the magnetite phase in RQ skeletal Fe may arise from the higher activity of the RQ alloy. When the skeletal Fe was heated under Ar flow, the content of magnetite phase increased with temperature and became the main composition at 400℃ for the skeletal Fe from the RQ alloy. For the skeletal iron from the NQ alloy, phase change under heating is less obvious compared with that for the RQ skeletal iron. The H2-TPD profiles of the catalysts showed that two H2 desorption peaks appeared in both NQ and RQ skeletal iron, but the temperatures at maximum desorption rate of RQ skeletal iron were higher than those of the NQ skeletal iron. The CO-TPD experiment showed that NQ skeletal iron had the stronger affinity to CO than RQ skeletal iron. The different properties were explained on the basis of structure.     

Strong-coupling diffusion in relativistic systems

Different from the early universe, heavy-ion collisions at very high energies do not reach statistical equilibrium, although thermal models explain many of their features. To account for nonequilibrium strong-coupling effects, a Fokker-Planck equation with time-dependent diffusion coefficient is proposed. A schematic model for rapidity distributions of participant baryons is set up and solved analytically. The evolution from SIS via AGS and SPS to RHIC energies is discussed. Strong-coupling diffusion produces double-peaked spectra in central collisions at the higher SPS momentum of 158 A.GeV/c and beyond.     

徒骇河聊城大学段水质情况的检测

徒骇河是流经聊城地区的一条主要河流,将其作为研究对象,在不同地点取样,对其水质进行了实验检测。结果显示,徒骇河水质只符合国家Ⅳ或Ⅴ类水的标准,即一般工业或农业用水及景观用水等。因此,长期饮用此水或用于灌溉农田都会对居民及农作物甚至当地的生态环境带来严重的负面影响。     

电阻放大法检测开尔文电桥故障

实验教学中开尔文电桥很难找到平衡,而故障检测工作又较繁琐,文章提出一种快速检测故障的方法,即电阻放大法检测开尔文电桥故障。     

The reaction front hypothesis in solid-state digestion: estimation of minimum size of viable seed body

An alternative mechanism for the anaerobic digestion of a bed of solids was recently proposed. A multizoned reaction front might form around a suitable body of seed material, then advance through the bed, within the solid phase. Such a solid-phase mechanism might coexist with liquid-phase digestion but one or the other of these two parallel mechanisms might generally be dominant. It is envisaged that solid-phase digestion would be favored by the presence of viable seed bodies: single particles of a suitable seed material above a minimum size or equivalent aggregates. A key determinant of the feasibility of this mechanism is expected to be the minimum viable size for a seed body (d _min). This would depend on the thickness of the reaction zones, some of which must initially be accommodated within the seed body. In this article, we present some theoretical estimates of d _min, which indicate a magnitude of 7–700 mm. Such values suggest that solid-phase digestion might be the norm in semi-dry waste digesters. Such digestion might be rare in unseeded landfills but it would appear likely that it could easily be initiated by suitable seeding.