Modeling and Integration Method of Sys ML Model for Complex Business Scenarios

The development process of complex equipment involves multi-stage business processes,multi-level product architecture,and multi-disciplinary physical processes.The relationship between its system model and various disciplinary models is extremely complicated.In the modeling and integration process,extensive customized development is needed to realize model integration and interoperability in different business scenarios.Meanwhile,the differences in modeling and interaction between different modeling tools make it difficult to support the consistent representation of models in complex scenarios.To improve the efficiency of system modeling and integration in complex business scenarios,a system modeling and integration method was proposed.This method took the Sys ML language kernel as the core and system model function integration as the main line.Through the technical means of model view separation,abstract operation interface,and model view configuration,the model modeling and integration of multi-user,multi-model,multi-view,and different business logic in complex business scenarios were realized.

Process Optimization of Cu-en/AP Composite Microspheres Preparation by Electrostatic Spray Method Based on ANSYS Simulation

To investigate the process optimizationof Cu-en/AP composite microspheres preparation via electrostatic spraying,and to reveal the effects of droplet properties and flow rate variations on the experimental results during the electrostatic spraying process,the prepared process parameters of Cu-en/AP composite microspheres by electrostatic spray method under the orthogonal experimental design simulated by ANSYS(Fluent).The influence of flow rate,solvent ratio,and solid mass on the experimental results is examined using a controlled variable method.The results indicate that under the conditions of a flow rate of 2.67×10^(-3)kg/s an acetone-to-deionized water ratio of 1.5∶1.0,and a solid mass of 200 mg,the theoretical particle size of the composite microspheres can reach e nanoscale.Droplet trajectories in the electric field remain stable without significant deviation.The simulation results show that particle diameter decreases with increasing flow rate,with the trend leveling off around a flow rate of 1×10^(-3)kg/s.As the solvent ratio increases(with higher acetone content),particle diameter initially decreases,reaching a minimum around a ratio of 1.5∶1.0 before gradually increasing.Increasing the solid mass also reduces the particle diameter,with a linear increase in diameter observed at around 220 mg.Cu-en/AP composite microspheres with nanoscale dimensions were confirmed under these conditions by the final SEM images.

以躯体症状为主的抑郁症患者述情障碍特征分析

目的探讨以躯体症状为主的抑郁症患者述情障碍的临床特征。方法对52例以躯体症状为主诉(A组)和56例以情感症状为主诉(B组)的抑郁症患者与50名正常健康者(C组),采用汉密顿抑郁量表和多伦多述情障碍量表进行评定分析。结果A组汉密顿抑郁量表焦虑/躯体化、睡眠障碍及绝望感因子分和多伦多述情障碍量表因子Ⅲ评分均显著高于B组及C组(P<0.05或0.01);多伦多述情障碍量表评分除B组因子Ⅲ与C组比较无显著性差异外,A、B两组总分和其他各因子分均显著高于C组(P均<0.05)。结论以躯体症状为主的抑郁症患者可能有更多的消极观念,并且缺乏幻想和想象力。

电脑音乐技术在高师视唱练耳教学中的运用初探

多媒体计算机的广泛运用,计算机音乐、MIDI技术的飞速发展,为高师音乐专业教学改革拓展了一个崭新的天地。这一新的科技手段的介入,势必给高师音乐专业教学观念带来巨大的冲击和震撼。今天的多媒体计算机、计算机音乐、MIDI技术,除了在音乐创作方面已被众多作曲家们广泛认同和采用外,在高师音乐专业的视唱练耳、音乐欣赏、基本乐理、曲式与作品分析、和声与即兴配奏、配器、创作等课程教学中也有着很好的应用前景。笔者在《视唱练耳》教学实践中,利用多媒体计算机将音乐音序器软件Cakewalk用于视唱练耳的课堂教学,进行了初步的探索和尝试。

Ionization of a covalent organic framework for catalyzing the cycloaddition reaction between epoxides and carbon dioxide

Covalent organic frameworks(COFs),with two dimensional(2D-)or three dimensional(3D-)structures,have accessible open channels or nanopores,with uniform sizes ranging from angstroms to nanometers and have emerged as an excellent and promising platform for designing catalysts or catalyst carriers.Herein,a 2 D-COF grafted with a 1-alkyl-3-methylimidazolium-based ionic liquid(AMIMBr@H2 P-DHPh COF)on the channel walls was synthesized and utilized as a highly efficient heterogeneous catalyst for the chemical fixation of CO2 via a reaction with epoxides under solvent-free and co-catalyst-free conditions.The as-synthesized AMIMBr@H2 P-DHPh COF shows excellent catalytic activity in promoting the cycloaddition reactions between epoxide and CO2;the excellent catalytic activity was maintained for up to five cycles.Advantages like high porosity,functional versatility,easy modification of COFs,and high catalytic activity of ionic liquids,have been realized in a single material.

A novel iron-chelating polyimide network as a visible-light-driven catalyst for photoinduced radical polymerization

With the aim of developing a low-cost and efficient visible-light-driven photocatalyst for radical polymerization,iron-chelating polyimide networks(Fe@MPI)was fabricated by firstly synthesizing photoactive melamine-containing polyimide(MPI)networks and then incorporating Fe(III)cations into the polymer networks.Fe@MPI exhibits a wide absorption spectrum ranging from 220 to 1250 nm and 3.5 times higher photocurrent intensity as compared with the pristine MPI.Based on its excellent photo-electric properties,Fe@MPI was employed as a recyclable heterogeneous catalyst,providing sufficient activity for the visible-light driven radical polymerization to synthesize poly(methyl methacrylate)with molecular weight up to 31.×10^4 g mol.Taking advantage of the heterogeneous nature of the catalyst,Fe@MPI could be facilely regenerated from the polymerization solution by filtration without an obvious loss of its activity.This research provides a novel recyclable catalyst for visible-light driven radical polymerization.

Highly dispersed few-layer MoS_2 nanosheets on S, N co-doped carbon for electrocatalytic H_2 production

Ultrathin small MoS2nanosheets exhibit a higher electrocatalytic activity for the hydrogen evolution reaction.However,strong interactions between MoS2layers may result in aggregation;together with the low conductivity of MoS2,this may lower its electrocatalytic activity.In this paper we present a method that we developed to directly produce solid S,N co‐doped carbon(SNC)with a graphite structure and multiple surface groups through a hydrothermal route.When Na2MoO4was added to the reaction,polymolybdate could be anchored into the carbon materials via a chemical interaction that helps polymolybdate disperse uniformly into the SNC.After a high temperature treatment,polymolybdate transformed into MoS2at800°C for6h in a N2atmosphere at a heating rate of5°C/min,owing to S2?being released from the SNC during the treatment(denoted as MoS2/SNC‐800‐6h).The SNC effectively prevents MoS2from aggregating into large particles,and we successfully prepared highly dispersed MoS2in the SNC matrix.Electrochemical characterizations indicate that MoS2/SNC‐900‐12h exhibits a low onset potential of115mV and a low overpotential of237mV at a current density of10mA/cm2.Furthermore,MoS2/SNC‐900‐12h also had an excellent stability with only^2.6%decay at a current density of10mA/cm2after5000test cycles.

A study of the genus Xylotrechus Chevrolat(Coleoptera:Cerambycidae)from Beijing,China

Ten species of the genus Xylotrechus Chevrolat,1860 from Beijing are studied.Xylotrechus pekingensis Pic,1939 is reinstated from synonym of Xylotrechus yanoi Gressitt,1934,and newly recorded from Hebei and Shaanxi Provinces.Xylotrechus bifenestratus Pic,1916 is proposed as a new junior synonym of Xylotrechus polyzonus(Fairmaire,1888),both were described from Beijing,China.Three species,X.ibex(Gebler,1825),X.pyrrhoderus Bates,1873,and X.robusticollis(Pic,1936),are reported from Beijing for the first time.Several new localities are added to the related species based on specimens examined.A key to the ten species of Xylotrechus Chevrolat,1860 from Beijing is provided.

Transition Metal Oxides/Chalcogenides for Electrochemical Oxygen Reduction into Hydrogen Peroxides

Electrochemical oxygen reduction reaction via the two-electron pathway(2e-ORR)is becoming a promising and sustainable approach to producing hydrogen peroxide(H_(2)O2)without significant carbon footprints.To achieve better performance,most of the recent progress and investigations have focused on developing novel carbon-based electrocatalysts.Nevertheless,the sophisticated preparations,decreased selectivity and undefined active sites of carbon-based catalysts have been generally acknowledged and criticized.To this end,transition metal oxides and chalcogenides have increasingly emerged for 2e-ORR,due to their catalytic stability and tunable microstructure.Here,the development of metal oxides and chalcogenides for O2-to-H_(2)O2 conversion is prospectively reviewed.By summarizing previous theoretical and experimental efforts,their diversity and outstanding catalytic activity are firstly provided.Meanwhile,the topological and chemical factors influencing 2e-ORR selectivity of the metal oxides/chalcogenides are systematically elucidated,including morphology,phase structures,doping and defects engineering.Thus,emphasizing the influence on the binding of ORR intermediates,the active sites and the underlying mechanism is highlighted.Finally,future opportunities and challenges in designing metal oxides/chalcogenides-based catalysts for H_(2)O2 electro-synthesis are outlined.The present review provides insights and fundamentals of metal oxides/chalcogenides as 2e-ORR catalysts,promoting their practical application in the energy-related industry.

Local Structure and Dynamics Procedure of Impurities Fe,Al and Mn in Melt Beryllium

The local structure and dynamics of impurities Fe,Al and Mn in beryllium were investigated on an atomic scale using ab initio molecular dynamics and statistical physics methods.The analysis of the radial distribution function centered on impurity atoms shows that the density of beryllium atoms around Fe and Mn is 8.4%and 8.6%higher than that around Al,respectively.The statistics of the measure square displacement of impurity atoms show that the diffusion coefficients of Al atoms are 114%and 133%larger than that of Fe and Mn atoms in the melt beryllium,respectively.Statistical analysis of velocity autocorrelation function of impurity atom shows that Fe and Mn atoms collide strongly with beryllium atoms in the first coordination layer,indicating that they are tightly surrounded and bound by the surrounding beryllium atoms in the central position,while the beryllium atoms around Al are loosely arranged and have weak binding forces with Al.The analysis of the activity coefficients of the impurities shows that when Fe or Mn enters the melt beryllium,it reduces the free energy of the system,whereas when Al enters,it increases the system energy.In summary,the interatomic force of BeAl is weak,so they do not form intermetallic compounds,and Al diffuses quickly in beryllium.While BeFe and BeMn have strong interatomic forces,and tend to form more BeFe and BeMn bonds to reduce the free energy of the system,so Fe and Mn diffuse slowly in beryllium.Ab initio molecular dynamics can be used to forecast the best experimental temperature for the vacuum distillation of beryllium.

Recent Progress on Halo Nuclei in Relativistic Density Functional Theory

Since the discovery of the halo nucleus ^(11)Li in 1985,halo phenomena in exotic nuclei have always been an important frontier in nuclear physics research.The relativistic density functional theory has achieved great success inthestudyofhalonucleg,theself-consistent description ofhalonucleusLiandthe microscopic predic tion of deformed halo nuclei.This paper introduces some recent progresses based on the deformed relativistic Hartree-Bogoliubov theory in continuum(DRHBc)and the triaxial relativistic Hartree-Bogoliubov theory in continum(TRHBc).A microscopic and self-consistent description of the deformed halo nucleus ^(37)Mg,including its small one-neutron separation energy,large root-mean-square radius,diffuse density distribution,and p-wave components for the halo neutron,has been achieved by the DRHBc theory.The DRHBc theory has also predicted a deformed neutron halo and the collapse of the N=28 shll closureintherecently discovered isotope ^(39)Na The TRHBc theory has been newly developed and applied to the aluminum isotopic chain.The heaviest odd-odd ^(42)AI has been predicted as a triaxial halo nucleus with a novel shape decoupling between its core and halo at the triaxial level.

A new simple and reliable high-performance liquid chromatography-diode array detection method for the simultaneous quantitative and fingerprint analyses of Salvia przewalskii

In the present study,we developed a novel high-performance liquid chromatography-diode array detection(HPLC-DAD)method for the simultaneous determination and fingerprinting of 15 components in Salvia przewalskii.The method had good linearity,precision,stability and recovery.Chromatographic fingerprints were determined by HPLC-DAD using rosmarinic acid peaks as references,and 17 common peaks were selected.The similarity indexes calculated based on similarity system theory of the 10 samples were higher than 0.948,indicating good correlation among the common peaks.The chromatograms distinguished S.przewalskii from Salvia miltiorrhiza and identified the origins of S.przewalskii.These results suggested that the proposed method was suitable for S.przewalskii quality control.

课堂动作赏谈

那天听了一节外教老师的课,其他的没学到,对老外在课堂上的动作记忆犹新。听朋友介绍说,老外一节课的活动量差不多是我们中国教师一节课活动量的5倍以上。想了想,觉得蛮有道理的。老外上课,动作特别多,难怪学生听得那么入神,课堂气氛那么活跃,掌握的知识那么牢固。于是,就有了写一写“课堂里的动作”的冲动。 课堂里必须要有动作,没有动作的课堂是一汪死水。那么,课堂里老师应有那些动作呢? “走一走” 上课前,不会每一个学生都做好了上课准备,课堂中,不会每一个学生都在认真听讲。此刻,老师在课堂里走一走,就能给个别学生以提醒。当然,走一走更重要的作用是让老师离开“高高在上”的讲台,拉近老师与学生之间的距离,距离近了,心就近了,心近了,交流就更容易了。