中画幅数码单反Phase One 645DF

Phase One 645DF由Phase One与Mamiya联手打造，它在过去机型的基础上提升了机身的响应速度和对焦速度，而且还新增了用户自定模式以及预制的场景模式，能够使其在拍摄时大幅缩减时间。同时，针对商业摄影师经常使用闪光灯的情况，645DF还特别提升了闪光同步速度。相机系统首次利用镜间快门和帘幕快门的双快门系统，使闪光同步速度达到1／1600秒。     

中画幅数码单反Phase One 645DF

Kailas Flowair 30的容量为30升,采用韩国210D加强耐磨尼龙面料、YKK拉链、ITW扣具精心制作,耐磨位置使用500D超耐磨CORDURA材料,共有黑色、暗灰、迷彩三种颜色选择。整个背包的重量仅为0．9公斤,是一款适合短途越野和旅行活动的轻型运动背包。空气网背负系统使包身不用直接与背部接触,不但能够减轻重量,而且具有极好的透气排汗功能,保持背部干爽。     

Degao Magnesium Announced Startup of Phase Ⅰ Project

<正> Hubei Degao Magnesium Industry Co Ltd held a ceremony onJune 28th to start up its first phase project at its factory sitein Qichun,Hubei province.The startup has been delayed forfourteen months.(CCR2009 No.12) The first phase projectincludes a 15 000 t/a magnesium oxide unit,a 70 000 t/a activemagnesium containing calcium carbonate unit and a 20 000 t/amagnesium and magnesium alloy unit.     

Anomalous Phase Transition in Shock‐Compressed PbO

Transformation of the rhombic modification of lead monoxide into a tetragonal form with a lower density under shock compression in the range of pressures of 9.5 – 35 GPa has been observed. It is shown that the anomalous phase transition occurs only in the porous material, and the yield of the new phase increases with decreasing temperature, i.e., results from the mechanical action of the shock wave. Specific features of the shockwave transformation of lead monoxide compared to an analogous effect caused by grinding and static compression with shear are discussed.     

LDK Solar Commences Commercial Production in Polysilicon Plant Phase Ⅱ

<正> LDK Solar Co., Ltd.(NYSE: LDK) announcedon August 23rd that the second 5000 t/a polysilicon train has completed thecommissioning process and commencedcommercial production.This second train, located at the 15 000 t/a Mahong Polysilicon Plant in Xinyu,Jiangxi province, is expected to reach itsdesigned annualized capacity within threeto six months.Construction on the 15 000 t/a MahongPolysilicon Plant was started in 2008.Thewhole project is conducted in three phaseswith a capacity of 5 000 t/a for each phase.     

Effect of Phase Changes on Metal‐Particle Combustion Processes

This paper summarizes a series of experimental studies addressing combustion of single metal particles. Sets of freefalling monodisperse molten metal droplets were formed at repeatable initial temperatures and velocities in a pulsed microarc discharge ignited between a cold tool cathode and a consumable wire anode. The droplets formed in oxygenated environments immediately ignited and burned, while their temperature histories were studied using optical pyrometry. Burning particles were quenched at different combustion times using techniques providing variable cooling rates. Analyses of the quenched samples were used to recover the evolution of burning particle compositions for different metals. Experiments were conducted with Al, Mg, Zr, Ti, Ta, W, Mo, Fe, and Cu particles. In addition, similar combustion experiments were carried out with boron particles produced using an oxygenacetylene torch melting an edge of a vibrating boron filament. Most of the combustion experiments were conducted in air, while argon–oxygen, helium–oxygen, and carbondioxide environments were also used in some tests. A limited number of experiments on aluminumparticle combustion were conducted in microgravity. The experiments were aimed at identifying correlations between the burning particle temperature and composition histories. Dissolution of oxygen and other gases was observed to occur within the burning metal, leading to phase changes coinciding with sudden changes in metal combustion regimes. Equilibrium metal–gas phase diagrams were used to interpret the experimentally observed metal combustion behavior. Based on the experimental results, an expanded mechanism of metal combustion was suggested, emphasizing reactions and phase changes occurring within the burning metal in addition to reactions occurring on and above the metal surface.     

Influence of Gas Phase Reactions on DME-SCR over γ-alumina

Abstract  

Above 300 °C, gas phase reactions occur between dimethyl ether (DME), NO and O₂ generating NO₂. The influence of these reactions on DME-SCR was studied in a setup that decoupled the occurrence of gas phase reactions from catalyst temperature. NO_x conversion decreased at 350 °C and increased at 250 °C due to less DME available and higher NCO conversion with NO₂, respectively.     

Computational Fluid-dynamics of Liquid Phase Flow on Distillation Column Trays

A computational fluid-dynamics model is presented for predicting the two-phase two-dimensional liquid phase flow on a distillation column tray based on the modification of Navier-Stokes Equation by considering both the resistance and the enhanced turbulence created by the uprising vapor. Experimental measurement of the local liquid phase velocity on an air-water simulator of 1.2m in diameter by using the hot film anemometer is briefly described. Two of the conventional fluid-dynamic constants are readjusted for the case of liquid flow on a tray by fitting the experimental data. The predicted local liquid phase velocity and direction of flow by the present model are confirmed satisfactorily by the authors' experimental measurements and by the data from literature. By the aid of the present model, the concentration field on the tray can be computed for the evaluation of the enhancement of liquid phase concentration across a tray. The advantages of applying computational fluid-dynamics to tray column design     

Appendix B Test Method on Exudation Quantity of Glassy Phase

B1 Scope This standard specifies the principle, specimen, testing process, result and report of the test method on seeping quantity of glassy phase of fused cast zirconiaalumina refractories.     

Phase holdup and liquid dispersion in gas-liquid-solid circulating fluidized beds

Axial and radial profiles of gas and solids holdups have been studied in agas-liquid-solid circulating fluidized bed at 140mm i.d..Experimental results indicate that the axialand radial profiles of gas and solids holdups are more uniform than those in a conventionalfluidized bed.Axial and radial liquid dispersion coefficients in the gas-liquid-solid circulating fluidizedbed are investigated for the first time.It is found that axial and radial liquid dispersioncoefficients increases with increaes in gas velocity and solids holdup.The liquid velocity has littleinfluence on the axial liquid dispersion coefficient,but would adversely affect the redial liquiddispersion coefficient.It can be concluded that the gas-liquid-solid circulating fluidized bed hasadvantages such as better interphase contact and lower liquid dispersion along the axial directionover the expanded bed.     

Phase development and dielectric responses in PMN–BNT ceramics

(1 − x)Pb(Mg_1/3Nb_2/3)O₃–x(Bi_0.5Na_0.5)TiO₃ ceramics were prepared by the conventional mixed-oxide method. All compositions show complete perovskite solid solutions and the structure to change from cubic to rhombohedral at x = 0.5. The dielectric constant and dielectric loss tangent were measured as a function of both temperature and frequency. The results indicated a relaxor ferroelectric behavior for all ceramics. The temperature at maximum of the dielectric constant of PMN–BNT ceramics were seen to increase with increasing BNT content. Moreover, the broadest dielectric peak occurs at x = 0.9, which leads to a morphotropic phase boundary in this system.     

Methanolysis of Poly（ethylene terephthalate）in Supercritical Phase

1 INTRODUCTIONPoly(ethylene terephthalate), commonly known as PET polyester, is extensively used for making synthetic fibers and package containers. The volume of PET consumed is rising by year, and thus the chemical recycling and reuse of waste PET are drawing much attention for the preservation of resources and the protection of environment. Through chemical recycling, waste PET is depolymerized into its valuable monomers such as dimethyl terephthalate (DMT), bis (hydroxyethyl) ter…     

Ternary Phase Diagram of β-Sitosterol–γ-Oryzanol–Canola Oil

β-Sitosterol and γ-oryzanol have been shown to form unique structures in canola oil that have the potential to act as saturated and trans fat replacers [1–7]. The ternary phase, reported herein, illustrates numerous interesting physical systems. At high canola oil ratios with low β-sitosterol and γ-oryzanol concentrations, the system has a crystal structure capable of mimicking fat crystal networks. Four mesophases are identified based on Bragg’s ratios using small angle X-ray scattering. Two mesophases are lamellar crystals, one is the cubic P phase, and the fourth is an amorphous material due to the low solids content. Wide-angle X-ray further subcategorized the phases based on polymorphic divisions of the hydrocarbon side chain packing. In all, six distinct phases are reported, ranging from lamellar crystals, to liquid crystals to what appears to be a lipid glass.     

Phase Composition and Thermal Expansion of CaO Stabilised ZrO2 Refactories

In this,phase compsition and thermal expansion behaviour of CaO Stabilised refractories were studied,Special attention was paid to the expasion behaviour of three materials with different phase composition,The research results indicated that the expansion behaviour could be improved by modifying the stabilization of ZrO2,which thus leads to the increase in the thermal shock resistance and possibly eroion resistace of as-obtained CaO stabilised ZrO material.     

China and Kazakhstan Sign to Build Multinational Gas Pipeline Phase Ⅱ

<正> China National Petroleum Corp (CNPC) hassigned an agreement with KazMunayGas concerningdesign,financing,construction andoperation of the Kazakhstan-China Gas Pipelinephase II.CNPC said June 13th.Under the agreement,the two sides willjointly build the Kazakhstan-China GasPipeline phase II project in order to meet     

Surfactant‐Enhanced Carbon Regeneration in a Vapor‐Phase Application

Abstract

Coal‐based granular activated carbon (GAC) is saturated with trichloroethylene (TCE) by passing air through a fix bed adsorber. In surfactant‐enhanced carbon regeneration, an aqueous solution of anionic surfactant, sodium dodecyl sulfate (SDS), is passed through the bed to induce desorption of TCE. More than 95% of the sorbed TCE was removed in the desorption operation with a 0.1 M SDS solution at a superficial flow rate of 1 cm/min. The desorption rate of TCE from pores of GAC is limited by pore diffusion and not significantly affected by either the concentration of SDS in the regenerant (when well above the critical micelle concentration) or its flow rate. From the breakthrough curve of a subsequent adsorption cycle without a flushing step following the desorption, only 7% of the virgin carbon effective adsorption capacity is observed for the regenerated carbon. With a water flushing step following the regeneration step, the effective adsorption capacity is significantly improved to about 15% of that of virgin carbon. Increased temperature of the flushing water also enhances the effective adsorption capacity of the regenerated GAC. Separate batch adsorption‐desorption isotherms of SDS on GAC support the enhanced desorption of SDS at elevated temperatures. The drastic reduction in the effective adsorption capacity of regenerated GAC results from the residual SDS remaining in the pores of GAC as confirmed by thermal gravimetric analysis. Both the regeneration and water flush steps are rate limited under conditionsused here.     

The Phase Behavior of γ-Oryzanol and β-Sitosterol in Edible Oil

The phase behavior of binary mixtures of γ‐oryzanol and β‐sitosterol and ternary mixtures of γ‐oryzanol and β‐sitosterol in sunflower oil was studied. Binary mixtures of γ‐oryzanol and β‐sitosterol show double‐eutectic behavior. Complex phase behavior with two intermediate mixed solid phases was derived from differential scanning calorimetry (DSC) and small‐angle X‐ray scattering (SAXS) data, in which a compound that consists of γ‐oryzanol and β‐sitosterol molecules at a specific ratio can be formed. SAXS shows that the organization of γ‐oryzanol and β‐sitosterol in the mixed phases is different from the structure of tubules in ternary systems. Ternary mixtures including sunflower oil do not show a sudden structural transition from the compound to a tubule, but a gradual transition occurs as γ‐oryzanol and β‐sitosterol are diluted in edible oil. The same behavior is observed when melting binary mixtures of γ‐oryzanol and β‐sitosterol at higher temperatures. This indicates the feasibility of having an organogelling agent in dynamic exchange between solid and liquid phase, which is an essential feature of triglyceride networks.     

Phase equilibria in the calcium nitrate–water–isopropyl alcohol system

Results of an investigation of the solubility of the components of the water–isopropyl alcohol system in the temperature range of 253–268 K are given. Using fractional fusion, the concentrations of twocomponent water–isopropyl alcohol system have been determined, where fusion occurs more homogeneously. Phase diagrams of the calcium nitrate–water–isopropyl alcohol systems have been plotted at temperatures of 253, 263, and 268 K. The working area where compositions can be chosen for preparing the process liquid with a low freezing point has been determined.