Turbulent Flow Action of Pulp in Wet - Laid Non - Woven Processes

The paper deals with the fluid field of web forming in wet-laid non-woven production.The influence of the turbulent flow on blending fiber and occluded fluid produced in pulp flow has been discussed in theory and practice.The suitable use of the imported velocity of pulp is very important in producing wet-laid products of good quality.

Modeling and simulation of a novel vertical actuator based on electrowetting on dielectric

A novel vertical actuator based on electrowetting on dielectric （EWOD） was designed, analyzed and simulated. Modeling results indicated that the vertical driving force of the actuator obeyed a second order polynomial of applied voltage, which was verified by Covent_ware 2006. As a resuit, the vertical driving force of the EWOD actuator with a 1.1 nL droplet and a 1.75 μm thick polymer was about 0.5 μN under an applied voltage 100V which was comparable to that of the electrostatic actuators. Moreover, the noise from plane forces we analyzed and simulated was very low. Therefore, we made a conclusion that the EWOD actuator can be used in MEMS transducer.

On elastocapillarity:A review

Elastocapillary phenomena involving elastic deformation of solid structures coupled with capillary effects of liquid droplets/films can be observed in a diversity of fields, e.g., biology and microelectromechanical systems （MEMS）. Understanding the physical mechanisms underlying these phenomena is of great interest for the design of new materials and devices by utilizing the effects of surface tension at micro and nano scales. In this paper, some recent developments in the investigations on elastocapillary phenomena are briefly reviewed. Especially, we consider the deformation, adhesion, self-assembly, buckling and wrinkling of ma- terials and devices induced by surface tensions or capillary forces. The main attention is paid to the experimental results of these phenomena and the theoretical analysis meth- ods based on continuum mechanics. Additionally, the applications of these studies in the fields of MEMS, micro/nanometrology, and biomimetic design of advanced materials and devices are discussed.

Use of catalytic wet air oxidation (CWAO) for pretreatment of high-salinity high-organic wastewater

Catalytic wet air oxidation(CWAO)coupled desalination technology provides a possibility for the effective and economic degradation of high salinity and high organic wastewater.Chloride widely occurs in natural and wastewaters,and its high content jeopardizes the efficacy of Advanced oxidation process(AOPs).Thus,a novel chlorine ion resistant catalyst Bsite Ru doped LaFe_(1-x)Ru_(x)O_(3-)δin CWAO treatment of chlorine ion wastewater was examined.Especially,LaFe_(0.85)Ru_(0.15)O_(3-δ)was 45.5% better than that of the 6%RuO_(2)@TiO_(2)(commercial carrier)on total organic carbon(TOC)removal.Also,doped catalysts LaFe_(1-x)Ru_(x)O_(3-)δshowed better activity than supported catalysts RuO_(2)@LaFeO_(3) and RuO_(2)@TiO_(2) with the same Ru content.Moreover,LaFe_(0.85)Ru_(0.15)O_(3-)δhas novel chlorine ion resistance no matter the concentration of Cl^(−) and no Ru dissolves after the reaction.X-ray diffraction(XRD)refinement,X-ray photoelectron spectroscopy(XPS),transmission electron microscope(TEM),and X-ray absorption fine structure(XAFS)measurements verified the structure of LaFe_(0.85)Ru_(0.15)O_(3-)δ.Kinetic data and density functional theory(DFT)proved that Fe is the site of acetic acid oxidation and adsorption of chloride ions.The existence of Fe in LaFe_(0.85)Ru_(0.15)O_(3-)δcould adsorb chlorine ion(catalytic activity inhibitor),which can protect the Ru site and other active oxygen species to exert catalytic activity.This work is essential for the development of chloride-resistant catalyst in CWAO.

汽油加氢催化剂湿法硫化存在问题原因分析及对策

介绍了中国石油云南石化有限公司140万t/a汽油加氢装置催化剂湿法硫化过程中出现的循环氢中H2S含量高、选择性加氢脱硫催化剂床层温度突然升高等异常情况,分析了上述问题产生的原因,并采取了相应的对策。结果表明:注入过量硫化剂导致循环氢中H2S含量高,通过以75 t/h的处理量引入直馏石脑油4 h,可使循环氢中H2S体积分数从2.880%降低至0.012%;选择性加氢脱硫催化剂初期选择性不佳导致催化剂床层温度突然上升,采取将反应空速从1.8 h-1增大至2.5 h-1,并逐步提高反应器入口温度及控制反应温升的对策,经过24 h的缓慢钝化,反应器出口最高温度控制在273℃,两端床层总温升控制在不超过43℃。

Effect of Substitution Sr Cations on the Structure in the Gd_(1)(Ba_(2−x)Sr_(x))Cu_(3)O_(7−δ) Phases

In an effort to improve the performance of superconductors in the field and high temperatures it is important to study the superconducting mechanism. For this reason, the cation substitution can be conducted. One of the high Tc superconductors Gd1Ba2Cu3O7−δ phase with Sr substitution has been synthesized, i.e. Gd1(Ba2−xSrx)Cu3O7−δ compound. The sample was synthesized by using a solid-state reaction method with a wet mixing, sintered for 12 hours at temperature 900°C. The synthesis results are characterized by using XRD. The results of Match-3 software analysis showed high (higher 85%) Gd1Ba2Cu3O7−δ phase was formed. The Sr substitution causes changes to the structure, i.e. the lattice parameters a, b and c, where the orthorhombicity tends to decrease with increasing Sr content. Refinement results show that based on the oxygen occupancy, the total oxygen content tends to increase.

Atmospheric wet and dry deposition of dissolved inorganic nitrogen to the South China Sea

At the global scale,atmospheric inputs of nitrogen are an important source of the new nitrogen that supports new marine production,especially in oligotrophic open oceans and marginal seas.This study reports quantities of atmospheric deposition of dissolved inorganic nitrogen(DIN)to the largest marginal sea in the North Pacific(the oligotrophic South China Sea,SCS)based primarily on rainwater sampling in the open northwestern region(Yongxing Island)from 2013 to 2015,and aerosol sampling from the SCS basin in June 2017.Atmospheric wet and dry deposition of DIN and their potential contributions to productivity were estimated.The volume-weighted mean rainwater concentrations during the wet and dry seasons were 4.9 and 18.1μmol L-1 for N+N(NO3-+NO2-),and 5.7 and 4.0μmol L-1 for NH4+,respectively.Rainwater concentrations of DIN were lower in the marginal seas than in the open ocean.The aerosol NO3-concentration was 1.15±1.18μg m-3 during the wet season,which is slightly lower than reported for the East China Sea and East Sea,but higher than in the Arabian Sea.Monthly wet and dry deposition rates ranged from 0.4-3.9 and 0.4-1.2 mmol m-2 mon-1 for NO3-,and 0.2-1.3 and 0.01-0.02 mmol m-2 mon-1 for NH4+,respectively.The annual wet and dry deposition fluxes of DIN were estimated to be 16.8 and 10.1 mmol m-2yr-1,respectively.Compared to other marginal seas,the SCS receives less atmospheric NO3-inputs than the Yellow Sea,East China Sea,East Sea,and northeastern Mediterranean Sea.The total atmospheric DIN deposition may account for 1.8-11.1%of the nitrogen supporting new production and 0.7-1.8%of the nitrogen supporting primary production.