STUDY ON THE CONTROL SYSTEM OF HYDRAULIC MOMENT-ADJUSTED BRAKE FOR DOWNWARD BELT CONVEYOR

Having analyzed the drawbacks on the design of control system of hydraulic momentadjusted brake system, the author presents a closed loop control system in the process of start and braking of the conveyer. On the basis of the concept of the critical time and the critical acceleration and its deductions, the working mode of the conveyer can be identified and controlled in feedback, furthermore, thus realize the process of soft start. In the deceleration process, the author points out the problems that exist in the present control system and sets forward the control process that acted by the combined function of brake moment of motor and the drag torque of hydraulic brake at the beginning of deceleration, it will further improved reliability of conveyor system.     

满足CE 要求和TUV 认证的励磁调节器设计及验证

为了使产品达到欧盟安全标准,进入欧盟的励磁系统设备必须通过CE认证。励磁调节器是励磁系统的控制核心。为了更进一步提高控制系统的要求,在满足CE的基础上,需要按照TUV认证的要求进行设计。通过分析励磁调节器的作用,在电器件选型、电磁兼容设计、结构件及柜体设计等方面与相关指令进行核对,完成了调节器装置的设计。该装置一次性通过TUV验证,证明装置设计的合理性,为电力系统其他装置进行CE及TUV认证提供参考。     

基于STD工控机的浓密自动控制系统

根据浓密工艺特点 ,采用STD工控机和模糊控制技术开发了浓密自动控制系统。该系统在红布金矿成功应用 ,具有性价比高 ,稳定可靠的特点。本文对控制任务 ,控制方案 ,系统特点 ,系统设计进行了介绍     

Construction of Carbon Nitride Based Intramolecular D–A System for Effective Photocatalytic Reduction of CO2

Catalysis Letters - Photocatalytic technology provides a new strategy for mitigating energy crisis. The development of photocatalytic materials with high efficiency and stable visible light...     

Molecular level understanding of CO2 capture in ionic liquid/polyimide composite membrane

Ionic liquid(IL)/polyimide(PI)composite membranes demonstrate promise for use in CO₂separation applications.However,few studies have focused on the microscopic mechanism of CO₂in these composite systems,which is important information for designing new membranes.In this work,a series of systems of CO₂in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide composited with 4,4-(hexafluoroisopropylidene)diphthalic anhydride(6FDA)-based PI,6FDA-2,3,5,6-tetramethyl-1,4-phenylene-diamine,at different IL concentrations were investigated by all-atom molecular dynamics simulation.The formation of IL regions in PI was found,and the IL regions gradually became continuous channels with increasing IL concentrations.The analysis of the radial distribution functions and hydrogen bond numbers demonstrated that PI had a stronger interaction with cations than anions.However,the hydrogen bonds among PI chains were destroyed by the addition of IL,which was favorable for transporting CO₂.Furthermore,the self-diffusion coefficient and free energy barrier suggested that the diffusion coefficient of CO₂decreased with increasing IL concentrations up to 35 wt-%due to the decrease of the fractional free volume of the composite membrane.However,the CO₂selfdiffusion coefficients increased when the IL contents were higher than 35 wt-%,which was attributed to the formation of continuous IL domain that benefitted the transportation of CO₂.     

N-Positive ion activated rapid addition and mitochondrial targeting ratiometric fluorescent probes for in vivo cell H2S imaging

Heterocyclic compound quinoline and its derivatives exist in natural compounds and have a broad spectrum of biological activity.They play an important role in the design of new structural entities for medical applications.Similarly,indoles and their derivatives are found widely in nature.Amino acids,alkaloids and auxin are all derivatives of indoles,as are dyes,and their condensation with aldehydes makes it easy to construct reaction sites for nucleophilic addition agents.In this work,we combine these two groups organically to construct a rapid response site(within 30 s)for H₂S,and at the same time,a ratiometric fluorescence response is presented throughout the process of H₂S detection.As such,the lower detection limit can reach 55.7 nmol/L for H₂S.In addition,cell imaging shows that this probe can be used for the mitochondrial targeted detection of endogenous and exogenous H₂S.Finally,this probe application was verified by imaging H₂S in nude mice.     

0.08mm厚中频用取向硅钢极薄带制作工艺研究

文章介绍了利用我厂生产的0.27 mm厚普通取向硅钢(CGO)作为原料制作0.08 mm厚中频用取向硅钢极薄带的工艺研究过程,着重研究了不同退火温度与机组运行速度(即保温时间)的热处理工艺对取向硅钢磁性能的影响,确定了以900℃×10 m/min为最佳的热处理工艺,获得了取向硅钢极薄带的磁感应强度B 8=1.846 T,铁损P 1.5/400=11.15 W/kg,矫顽力H c=53.57 A/m的良好中高频电磁性能的制作工艺。     

Capacitive performance of polyaniline/manganese dioxide nanofiber microsphere

This work has obtained polyaniline/manganese dioxide (PANI/MnO₂) nanofibers microsphere by interfacial chemical synthesis with 4‐amino‐thiophenol (4‐ATP) as the structure‐directing agent on the Au substrate. The cyclic voltammograms, galvanostatic charge–discharge, and electrochemical impedance spectroscopy were used to determine their capacitive performance. Powder X‐ray diffraction, thermogravimetry and differential scanning calorimetry, Fourier transformed infrared spectroscopy, Brunauer–Emmett–Teller surface area measurements, and scanning electron microscope were performed for physical and chemical characterization. The effect of 4‐ATP and acids on the capacitive performance of PANI/MnO₂ nanofibers microsphere was elucidated. The as‐prepared PANI/MnO₂ was nanofiber about 30 nm diameters, and they further self‐assembled into sphere. Its specific capacitance is up to 765 F g^?1 at 1.0 mA cm^?2 in 1.0M Na₂SO₄ solution. And it shows a high stability with a capacitance fade of only 14.9% after 400 charge–discharge cycles. The symmetric capacitor of PANI/MnO₂ (PM10+)/PANI/MnO₂ (PM10?) is assembled in 1.0M Na₂SO₄ solution, and its capacitive performance is compared with that of PANI (+)/PANI (?) and MnO₂ (+)/MnO₂ (?). © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40575.     

Doubly thermo-responsive brush-linear diblock copolymers and formation of core-shell-corona micelles

Doubly thermo-responsive brush-linear diblock copolymer of poly[poly(ethylene glycol) methyl ether vinylphenyl]-block-poly(N-isopropylacrylamide) (PmPEGV-b-PNIPAM) is prepared by RAFT polymerization. The obtained brush-linear diblock copolymer exhibits two lower critical solution temperatures (LCSTs) corresponding to the linear poly(N-isopropylacrylamide) (PNIPAM) block and the brush poly[poly(ethylene glycol) methyl ether vinylphenyl] (PmPEGV) block in water. This brush-linear diblock copolymer undergoes a two-step temperature sensitive micellization. At temperature above the first LCST, the brush-linear diblock copolymer self-assembles into core-corona micelles with the dehydrated PNIPAM block forming the core and the solvated brush PmPEGV block forming the corona. When temperature increases above the second LCST, the polystyrene backbone in the brush PmPEGV block collapses onto the dehydrated PNIPAM core to form core-shell-corona micelles, in which the dehydrated PNIPAM block forms the core, the collapsed polystyrene backbone in the brush PmPEGV block forms the shell and the solvated poly(ethylene glycol) side-chains forms the corona. The effect of the length of the PNIPAM block and the length of the poly(ethylene glycol) side-chains on the thermo-responsive micellization and the size of core-shell-corona micelles is investigated.     

Effect of the Inside Placement of Electrically Conductive Beads on Electric Field Uniformity in a Microwave Applicator

Non-uniform heating is a major issue in microwave applications, mainly due to inherently uneven distribution of electromagnetic energy in the microwave applicator. In this work, our aim is to improve electric field distribution uniformity by utilizing microwave reflection from electrically conductive beads placed in the microwave oven. The effects of position, size, and number of electrically conductive beads on the electric field distribution were numerically investigated, and validated through water-load experiments in the cavity. It is found that uniform electric field distribution was realized to some extent by appropriate placement of electrically conductive beads; meanwhile, average electric field intensity in the microwave oven was increased.