第Ⅱ类两态叠加多模叠加态光场的高次H压缩特性研究

本文在文献[3]的基础上,利用多模不等幂次压缩理论[7]研究了第Ⅱ类两态叠加多模叠加态光场 的不等幂次Nj次方H压缩效应。结果发现:当各模的压缩幂次数之和为偶数时,态 恒处于不等幂次Nj-H最小测不准态;而当各模的压缩幂次数之和为奇数时,态 在一定条件下总可呈现出周期性变化的Nj次方H压缩效应;文献[3]的研究结果,仅仅只是本文的普遍性结果在Nj=N（j=1,2,3,……,q）这一条件下的特例。

第Ⅱ类两多模相干态的叠加态光场的不等幂次高次Y压缩

文章在文献 2的基础上 ,利用多模不等幂次压缩理论[7] 研究了第Ⅱ类[2 ] 两多模相干态的叠加态光场｜Ψ( 2 )2 〉q 的不等高次Y压缩效应。结果发现 :1.当各模压缩幂次数Nj 为偶数时 ,态 ｜Ψ( 2 )2 〉q 恒处于不等幂次Nj—Y 最小测不准态。 2 .当各模压缩幂次数 Nj为奇数时 ,｜Ψ( 2 )2 〉q 的第一或第二正交分量在一定条件下呈现出不等幂次Nj 次方Y压缩效应。文献 2的研究结果 ,仅仅只是该文章的普遍性结果在Nj =N (j =1,2 ,3,… ,q)这一条件下的特例。

悬辊制管Ⅱ级管模质量问题分析和改进措施

介绍了悬辊制管的工序过程及从南方购进的悬辊制管Ⅱ级管模存在的质量问题,通过计算分析了引发这些质量问题的原因,并提出了相应的改进措施。

Fixed-bed column study for deep removal of copper(Ⅱ) from simulated cobalt electrolyte using polystyrene-supported 2-aminomethylpyridine chelating resin

This study presents the deep removal of copper (Ⅱ) from the simulated cobalt electrolyte using fabricated polystyrene-supported 2-aminomethylpyridine chelating resin (PS-AMP) in a fixed-bed.The effects of bed height (7.0–14.0 cm),feed flow rate (4.5–9.0 mL/min),initial copper (Ⅱ) concentration of the feed (250–1000 mg/L),feed temperature (25–40 ℃) and the value of pH (2.0–4.0) on the adsorption process of the PS-AMP resin were investigated.The experimental data showed that the PS-AMP resin can deeply eliminate copper (Ⅱ) from the simulated cobalt electrolyte.The bed height,feed flow rate,initial copper (Ⅱ) concentration of the feed,feed temperature and feed pH value which corresponded to the highest removal of copper (Ⅱ) were 7.0 cm with 35 mm of the column diameter,4.5 mL/min,40℃,1000 mg/L and 4.0,respectively.The breakthrough capacity,the saturated capacity of the column and the mass ratio of Cu/Co (g/g) in the saturated resin were correspondingly 16.51 mg/g dry resin,61.72 mg/g dry resin and 37.67 under the optimal experimental conditions.The copper (Ⅱ) breakthrough curves were fitted by the empirical models of Thomas,Yoon-Nelson and Adam-Bohart,respectively.The Thomas model was found to be the most suitable one for predicting how the concentration of copper (Ⅱ) in the effluent changes with the adsorption time.

A Reynolds mass flux model for gas separation process simulation:Ⅱ.Application to adsorption on activated carbon in a packed column

Simulations of adsorption process using the Reynolds mass flux model described in Part I of these serial articles are presented. The object of the simulation is the methylene chloride adsorption in a packed column(0.041 m id,packed with spherical activated carbon up to a length of 0.2 m). With the Reynolds mass flux model,breakthrough/regeneration curves, concentration and temperature as well as the velocity distributions can be obtained. The simulated results are compared with the experimental data reported in the literature and satisfactory agreement is found both in breakthrough/regeneration curves and temperature curves. Moreover,the anisotropic turbulent mass diffusion is characterized and discussed.

Multiple templates-based homology modeling and docking analysis of angiotensin Ⅱ type 1 receptor

Using the latest reported homologous Chemokine receptors （PDB ID： 3ODU, 3OE0 and 3OE6） as templates, twenty models of angiotensin II （Ang II） type 1 （AT1） receptor （known as p30556） were generated by multiple templates homology modeling. According to the results of the initial validation of these twenty models, the model 0020 was finally chosen as the best one for further studies. Then, a 2 ns molecular dynamic （MD） simulation for model 0020 was conducted in normal saline （0.9%, w/F） under periodical boundary conditions, which was followed by docking studies of model 0020 with several existing AT1 receptor blockers （ARBs）. The docking results reveal that model 0020 possesses good affinities with these docked ARBs which are in accordance with both the IC50 inhibitor values and their curative effects. The results also show more potent interactions between the model 0020 and its ARBs than those of ever reported results, such as hydrogen bonds, hydrophobic interactions, and especially cation-n interactions and π-π interactions which have never been reported before. This may reveal that the structure of the model 0020 is quite close to its real crystal structure and the model 0020 may have the potential to be used for structure based drug design：

Simulation of pre-precipitation in Ni_(75)Al_(14)Mo_(11) alloy by microscopic phase-field model

The early precipitation process of Ni（75）Al（14）Mo（11） alloy was simulated by microscopic phase-field model at different temperatures.The microstructure of the alloy,the precipitation time of Llo structure and occupation probability of the three kinds of atoms were investigated.It is indicated that the non-stoichiometric Ll0（Ⅰ/Ⅱ） phases are found in the precipitation process.With the temperature increasing,the appearance time of Ll0 is brought forward.The Ll0（Ⅱ） structure always precipitates earlier than the Ll0（Ⅰ） structure.Compared with lower temperature,higher temperature brings the formation time of Ll0 phase forward and makes Ll0 phase have a higher order degree.But lower temperature shortens the process time of the Ll0 phase to the Ll2 phase.Al and Mo atoms tend to occupy γ site,Ni atom tends to occupy a and β sites.At the same temperature,Al atom has stronger occupation ability than Mo atom in the same site.Ni,Al and Mo collectively form the composited Ll2 structure.

The Adsorption of Copper from Aqueous Solutions Using Acrylamide-Grafted Cellulose

In the present study, the aptitudes of acrylamide grafted cellulose to remove Cu（Ⅱ） ions from aqueous solutions were investigated. The preparation process was carried out through graft copolymerization of acrylamide onto cellulose, using ceric ammonium nitrate as an initiator. Fourier transform Infrared spectroscopy was used to confirm and characterization poly acrylamide-grafted cellulose formation. Batch experiments of Cu（Ⅱ） ions adsorption on the grafted cellulose adsorbent were performed. Effects of initial pH of the solution, contact time and initial Cu（Ⅱ） concentration on the adsorption of Cu（Ⅱ） were studied. The maximum adsorption of Cu（Ⅱ） ion on grafted cellulose is observed 90 mg/g at the initial pH of 6. Equilibrium time was reached within 3h. Kinetic data were analyzed using the pseudo-first-order, pseudo-second-order equations. The data fitted very well to the pseudo-second-order rate expression. The equilibrium data for adsorption isotherms of these metal ions on grafted cellulose were obtained using the Langmuir and Freundlich models and the Langmuir model was obtained to be in better correlation with the experimental data. The results showed that acrylamide-g-cellulose developed in this study could be an economical and effective adsorbent for application in removal of copper ion from water and waste waters.

Modified activated carbons with amino groups and their copper adsorption properties in aqueous solution

Activated carbons were prepared by two chemical methods and the adsorption of Cu(II) on activated carbons from aqueous solution containing amino groups was studied. The first method involved the chlorination of activated carbon following by substitution of chloride groups with amino groups, and the second involved the nitrilation of activated carbon with reduction of nitro groups to amino groups. Resultant activated carbons were characterized in terms of porous structure, elemental analysis, FTIR spectroscopy, XPS, Boehm titration,and p Hzpc. Kinetic and equilibrium tests were performed for copper adsorption in the batch mode. Also,adsorption mechanism and effect of p H on the adsorption of Cu(II) ions were discussed. Adsorption study shows enhanced adsorption for copper on the modified activated carbons, mainly by the presence of amino groups, and the Freundlich model is applicable for the activated carbons. It is suggested that binding of nitrogen atoms with Cu(II) ions is stronger than that with H+ions due to relatively higher divalent charge or stronger electrostatic force.

Characterization of cellulose-based electrospun nanofiber membrane and its adsorptive behaviours using Cu(Ⅱ),Cd(Ⅱ),Pb(Ⅱ)as models

Nanofiber membranes from the composite of cellulose acetate/polyvinylpyrrolidone were prepared using electrospinning technique. After treated with water and alcoholic KOH to remove partially polyvinylpyrrolidone and deacetylate the cellulose acetate, the membranes were further functionalized with thiol groups using thioglycolic acid. Related materials were characterized using infrared and thermogravimetric analysis. And the results showed that the membranes were success of functionalisation. Then the nanofiber membranes were used in the sorption-desorption process. The effects of pH, contacting time and adsorption capacity of nanofiber membranes were studied against Cu（II）, Cd（II） and Pb（II） ions. And the maximum adsorption capacities of Pb （II）, Cu （II）, and Cd （II） ions were estimated at 30.96, 19.63, 34.70 mg g-1. Our results suggested that the adsorption be- haviour of metal ions could be described using Langmuir model. Their adsorption kinetics was in agreement with the model of pseudo-second order, suggesting chemical adsorption as the rate-limiting step of the adsorption mechanism. The durability of the thiol-functionalized cellulose nanofiber membranes was also evaluated by repetitive adsorption-desorption.

利用非对称共面波导提高共面波导弯曲结构传输性能

针对共面波导弯曲结构传输损耗较大的问题,提出了一种改进弯曲结构。该结构引入非对称共面波导弯曲结构以及相应的转换单元,解决了传统共面波导弯曲结构中容易激发奇模信号的问题。结合使用频域和时域的有限差分方法,对弯曲结构的传输系数进行了计算。理论分析和测试结果表明改进后的弯曲结构有效地抑制了奇模信号的传输,降低了共面波导弯曲结构的传输损耗。改进后的弯曲结构具有结构设计简单、易于加工的特点。