基于“四融四制”的独立学院环境设计专业“艺工同频”人才培养模式研究

随着时代的发展,环境设计专业艺工融合的人才培养模式改革不断得到深化,为了更好地适应社会和行业的发展需求,各大院校设计教育更加注重实践性与创新性,积极探索将艺术工学概念融入教学体系中,“艺工结合”教学理念应运而生。梳理了国内外“艺工结合”教学模式研究现状,分析了独立学院环境设计专业人才培养存在的问题,探讨了“四融四制”下独立学院环境设计专业“艺工同频”人才培养的策略。旨在强化环境设计人才培养机制建设,满足社会对环境设计人才的需求,服务地方经济。

浅议建立西部环保业的社会化投融资体制

1999年以来,国家实施西部大开发的政策已形成了社会关注的经济热点。《国务院关于实施西部大开发若干政策措施的通知》明确了西部大开发中的重点任务和战略目标,把加强环境保护和建设列为重点任务之一,并提出“力争用5到10年时间,使西部地区基础设施和生态环境建设取得突破性进展,西部开发有一个良好的开局。”针对西部开发的要求,结合西部地区的特点和实际。

胶融钢制板式道床在城市轨道交通中的应用

随着城市轨道交通的发展,不可避免地出现了地下结构预留高度不足的问题,需要通过减小轨道结构高度来解决。当轨道结构高度不足较为严重时,常规的轨道结构型式不能满足轨道结构耐久性要求。本文提出的胶融钢制板式道床结构,可较大程度地减轻轨道结构高度不足对轨道结构的不利影响。本文通过有限元模型进行力学分析,并且在地铁合理位置设置试验段进行现场测试,验证了胶融钢制板式道床结构的可行性。

融媒制播演播室的系统设计

在电视频道高清化播出的整体规划和要求下,为适应电视节目对移动网络技术的融媒应用需求,本文以中小演播厅的高清化融媒改造为范例,通过演播室的功能定位、景区布局、背景屏应用、灯光改造和视音频系统设计等方面进行具体分析,详细阐释融媒制播演播室的整体系统方案。

Effect of process parameters on microstructure and mechanical properties of a nickel-aluminum-bronze alloy fabricated by laser powder bed fusion

This work investigated the effect of process parameters on densification,microstructure,and mechanical properties of a nickel-aluminum-bronze(NAB)alloy fabricated by laser powder bed fusion(LPBF)additive manufacturing.The LPBF-printed NAB alloy samples with relative densities of over 98.5%were obtained under the volumetric energy density range of 200−250 J/mm^(3).The microstructure of the NAB alloy printed in both horizontal and vertical planes primarily consisted ofβ'martensitic phase and bandedαphase.In particular,a coarser-columnar grain structure and stronger crystallographic texture were achieved in the vertical plane,where the maximum texture intensity was 30.56 times greater than that of random textures at the(100)plane.Increasing the volumetric energy density resulted in a decrease in the columnar grain size,while increasing the amount ofαphase.Notably,β_(1)'martensitic structures with nanotwins and nanoscaleκ-phase precipitates were identified in the microstructure of LPBF-printed NAB samples with a volumetric energy density of 250 J/mm^(3).Furthermore,under optimal process parameters with a laser power of 350 W and scanning speed of 800 mm/s,significant improvements were observed in the microhardness(HV 386)and ultimate tensile strength(671 MPa),which was attributed to an increase in refined acicular martensite.

3D Printing with a 5-Axis FDM Printer Using Bézier Techniques

In the last decade,3D printing,especially fused deposition modeling(FDM),has revolutionized manufacturing with intricate designs.Traditional 3-axis FDM printers face challenges with complex geometries,but 5-axis versions offer more design freedom.However,it requires specialized strategies.This research presents a model for 5-axis FDM printers using Bézier curves with an algorithm to enhance print quality.The result shows significant accuracy improvements,especially for curve-based tasks.In addition,this study deepens the understanding of 5-axis FDM technology,setting a solid basis for further research and potentially refining manufacturing methods.

企业文化“落地”探索——以建筑施工企业为例

企业文化落地是一个形象化的比喻。所谓＂落地＂,就是企业文化理念提炼完成后,由＂理论性＂的认识变成＂实践性＂的行动,将企业文化理念融入企业的生产经营管理和员工的思想行动中,推动企业又好又快发展。简而言之,就是指企业文化被员工接受并自觉执行。

Adaptive Modification of the Rolling Force Prediction

In rolling process, the rolling force is an important parameter. The precision of the predicted rolling force will directly affect the precision of the finished product. By using adaptive control theory and fusing the measured and predicted data, the precision of the predicted rolling force is gradually improved. This system has been used in plant for more than one year, and the result of the application shows that the system has steady and reliable performance, and high precision.

X荧光光谱法测定铁矿石中微量砷

本文试验了XRFS法测试铁矿石中微量砷,分别试验了粉末压片与熔融制样两种样品制备方法,对两种方法的检出限、测试精密度进行了对比,并将粉末压片法测试结果与HGAFS法进行比对。试验结果表明,采用粉末压片制样法与熔融制样法,样品检出限分别为0.005%、0.008%,该方法用于测试0.010%~1.00%之间的样品,RSD小于10%。

Fusion Expression of Raphanus sativus-Antifungal Protein 1 (Rs-AFP1) in Escherichia coli and Its Antifungal Activity on Verticillium dahliae

The Raphanus sativus L. antifungal protein 1 (Rs_AFP1) gene was isolated by polymerase chain reaction (PCR). The complete open reading frame and the fragment encoding the putative mature protein were inserted into the prokaryotic expression vector pET_32b(+), respectively. Subsequent expression showed that the Rs_AFP1 was produced in E. coli as a 27 kD fusion protein only when the N_terminal signal peptide was removed. After treatment with thrombin to remove part of the N_terminal His.tag sequence, the bacterially expressed Rs_AFP1 was used for fungal growth inhibition assay which was conducted on Verticillium dahliae Kleb., a soil_born fungus causing the cotton wilt disease. Results showed that, in the liquid medium, the Rs_AFP1 fusion protein at a concentration of 0.3 g/L clearly inhibited the growth of V. dahliae and the germination of spores. Thus the bacterially expressed fusion protein had the antifungal activity against V. dahliae.

Heating and melting mechanism of stainless steelmaking dust pellet in liquid slag

The heating and melting mechanisms of the pellets immersed in liquid slag were investigated, and the effect of the pellet heating and the melting conditions were studied. The results show that the dust component in the pellet is melted from the surface and no metallic elements are melted before the dust component, the time for the pellet completely melted is reduced as the iron powder content increases since the metallic iron has high thermal conductivity. These are four stages of heating and melting of pellet in liquid slag, they are the growth and melt of solid slag shell, penetration of liquid slag, dissolving of dust component and melting of reduced metals. The lifetime of the solid slag shell is in the range of 7-16 s and increasing the pre-heating temperature of the pellet and the slag temperature can shorten the slag shell lifetime. The time for the dust component in the pellet to be melted completely is in the range of 20-45 s and increasing the pre-heating temperature, especially in the range of 600-800 ℃, can obviously reduce the melting time. A higher slag temperature can also improve the pellet melting and the melting time is reduced by 10-15 s when the slag temperature is increased from 1 450 to 1 550 ℃. The pellet with higher content of iron powder is beneficial to the melting by improving the heat conductivity.

Tensile Properties of Mechanically-Defibrated Cellulose Nanofiber-Reinforced Polylactic Acid Matrix Composites Fabricated by Fused Deposition Modeling

Biodegradable polymers are highly attractive as potential alternatives to petroleum-based polymers in an attempt to achieve carbon neutrality whilst maintaining the mechanical properties of the structures.Among these polymers,polylactic acid(PLA)is particularly promising due to its good mechanical properties,biocompatibility and thermoplasticity.In this work,we aim to enhance the mechanical properties of PLA using mechanically-defibrated cellulose nanofibers(CNFs)that exhibit remarkable mechanical properties and biodegradability.We also employ fused deposition modeling(FDM),one of the three-dimensional printing methods for thermoplastic polymers,for the low-cost fabrication of the products.Mechanically-defibrated CNF-reinforced PLA matrix composites are fabricated by FDM.Their tensile properties are investigated in two printing directions(0°/90°and+45°/-45°).The discussion about the relationship between printing direction and tensile behavoir of mechanically-defibrated CNF-reinforced PLA matrix composite is the unique point of this study.We further discuss the microstructure and fracture surface of mechanically-defibrated CNF-reinforced PLA matrix composite by scanning electron microscope.

Probabilistic Tracking of Objects with Adaptive Cue Fusion Mechanism

A tracking method based on adaptive multiple cue fusion mechanism was presented,where particle filter is used to integrate color and edge cues.The fusion mechanism assigns different weights to two cues according to their importance,thus improving the robustness and reliability of the tracking algorithm.Moreover,a multi-part color model is also invoked to deal with the confliction among similar objects.The experimental results on two real image sequences show the tracking algorithm with adaptive fusion mechanism performs well in the presence of complex scenarios such as head rotation,scale change and multiple person occlusions.

Experimental study of pre-cracked concrete subjected to cryogenic freeze-thaw cycles based on an LNG concrete tank

To investigate the mechanical properties of concrete under the leakage condition for a liquefied natural gas storage tank,cryogenic freeze-thaw cycle tests were performed under liquid nitrogen refrigeration and water immersion melting.The effects of the cryogenic temperature,freeze-thaw cycle,pre-crack,and addition of steel fiber on the compressive strength,flexural strength,and splitting tensile concrete strength were analyzed.The experimental results show that the width of pre-cracks tends to expand after freeze-thaw cycles.When the freezing temperature is -80℃,the relative width of the pre-cracks expands by 1 to 2 times.However,when the freezing temperature is -120℃,the relative width of the pre-cracks expands by 2 to 5 times.Compared with the specimens without steel fibers,the specimens with steel fibers can still maintain a relatively complete appearance structure after the mechanical property tests.The compressive strength,flexural strength,and splitting tensile concrete strength decrease with the drop in the freezing temperature.After adding steel fibers,all of the three strengths increased.

Research and Design of Sleeve Detach and Reunion Drive Mechanism of Screw Melt Extruder Equipment

The design of sleeve detach and reunion drive device of screw melt ex- truder equipment was optimized, based on the present installation of hygraulic drive device to achieve the mechanical opening and closing of the sleeve, the dynamic model of the sleeve detach and reunion drive was theoretically measured, and it was verified that the device is simple to operate and convenient to maintain, thus it has great social values.

Hydrogen storage behaviours of nanocrystalline and amorphous Mg_(20)Ni_(10-x)Co_x(x=0-4) alloys prepared by melt spinning

The Mg2Ni-type alloys with nominal compositions of Mg20Ni10-xCox(x=0,1,2,3,4,%,mass fraction) were prepared by melt-spinning technology.The structures of the alloys were studied by XRD,SEM and HRTEM.The hydrogen absorption/desorption kinetics and the electrochemical performances of the alloys were measured.The results show that no amorphous phase forms in the as-spun Co-free alloy,but the as-spun alloys containing Co show a certain amount of amorphous phase.The hydrogen absorption capacities of the as-cast alloys first increase and then decrease with the incremental change of Co content.The hydrogen desorption capacities of as-cast and spun alloys rise with increasing Co content.The melt spinning significantly improves the hydrogenation and dehydrogenation capacities and kinetics of the alloys.The substitution of Co for Ni clearly enhances the discharge capacities of the alloys and the cycle stability of the as-spun alloys.

Dynamic measurement on infiltration process and formation mechanism of infiltration front

An infiltration measurement device was developed to research the infiltration process of molten AZ91D magnesium alloy into the Al2O3 short fibre preform.The variation of relationship between the heights of measuring points and the time for molten alloy to reach the measuring points was illustrated.The effect of infiltration process parameters on the infiltration front was analyzed. It is found that pressure and pouring temperature are the most important factors which affect the infiltration velocity and composite quality.Furthermore,considering the influence of temperature field,an infiltration model of molten AZ91D into the short fibre preform was constructed on the basis of experimental results and Darcy’s Law.The analysis shows that the results predicted by this model are consistent with the experimental results.

Atrial fibrillation in the elderly

This review discusses atrial fibrillation according to the guidelines of Brazilian Society of Cardiac Arrhythmias and the Brazilian Cardiogeriatrics Guidelines. We stress the thromboembolic burden of atrial fibrillation and discuss how to prevent it as well as the best way to conduct cases of atrial fibrillatios in the elderly, reverting the arrhythmia to sinus rhythm, or the option of heart rate control. The new methods to treat atrial fibrillation, such as radiofrequency ablation, new oral direct thrombin inhibitors and Xa factor inhibitors, as well as new antiarrhythmic drugs, are depicted.