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粉末涂料与流平性能 被引量:2
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作者 阚卫东 赵辰华 《现代涂料与涂装》 CAS 2006年第11期46-47,共2页
介绍了粉末涂料的流平机理及其改善措施。
关键词 粉末涂料 流平机理 流平性能
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β-羟烷基酰胺粉末涂料流平性能的影响因素研究
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作者 牛晓雪 《现代涂料与涂装》 CAS 2021年第7期4-6,共3页
聚酯树脂粉末涂料具有高效、环保、高性能及经济性四大显著特征而受到人们的欢迎,但由于其在流平性能上略逊色于溶剂型涂料,而在某些领域的应用受到限制主要讨论酸值、黏度、酸解剂类型及助剂等因素对β-羟烷基酰胺粉末涂料流平性能的... 聚酯树脂粉末涂料具有高效、环保、高性能及经济性四大显著特征而受到人们的欢迎,但由于其在流平性能上略逊色于溶剂型涂料,而在某些领域的应用受到限制主要讨论酸值、黏度、酸解剂类型及助剂等因素对β-羟烷基酰胺粉末涂料流平性能的影响。 展开更多
关键词 聚酯树脂 粉末涂料 涂层 流平性能
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纸张涂料的流平过程分析和影响因素
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作者 张恒 陈克复 《造纸科学与技术》 北大核心 2003年第3期20-22,共3页
本文从流变学上分析了涂料在纸面上的流平过程 ,计算出流平时间。计算表明不可能达到完全流平状态 ,并指出影响流平性的因素及流平性能测量和评价。
关键词 流变学 纸张涂料 流平性能 评价 影响因素 涂布
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PVC粉末涂料的研制
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作者 刘容德 李静 +1 位作者 刘浩 张桦 《聚氯乙烯》 CAS 2017年第12期22-29,42,共9页
考察了不同牌号的PVC-SG8型树脂、稳定剂、增塑剂、润滑剂、助流平剂、光稳定剂等对PVC粉末涂料流平性能的影响,得到的适宜配方为:PVC QS-650,100份;DOP,50份;硫醇甲基锡稳定剂,2.5份;光稳定剂UV419,0.8份;国产助流平剂,5.0份;钛白粉,2.... 考察了不同牌号的PVC-SG8型树脂、稳定剂、增塑剂、润滑剂、助流平剂、光稳定剂等对PVC粉末涂料流平性能的影响,得到的适宜配方为:PVC QS-650,100份;DOP,50份;硫醇甲基锡稳定剂,2.5份;光稳定剂UV419,0.8份;国产助流平剂,5.0份;钛白粉,2.5份;开环乙撑双硬脂酰胺,0.75份。工业化加工试验表明:该PVC粉末涂料具有蘸塑温度低、蘸塑时间短的优点。 展开更多
关键词 PVC树脂 粉末涂料 流平性能 加工应用
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聚氨酯粉末涂料用超低羟值羟基聚酯树脂的研究
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作者 牛晓雪 《现代涂料与涂装》 CAS 2022年第7期5-8,51,共5页
在-NCO/-OH双组分聚氨酯涂料中一般采用含-NCO的异氰酸酯和含有端羟基的聚酯树脂反应制得,由于异氰酸酯固化剂价格昂贵,固化过程中产生大量有机挥发物,给人们的身体带来一定危害,也对环境造成不利的影响。因此,通过降低端羟基树脂中的... 在-NCO/-OH双组分聚氨酯涂料中一般采用含-NCO的异氰酸酯和含有端羟基的聚酯树脂反应制得,由于异氰酸酯固化剂价格昂贵,固化过程中产生大量有机挥发物,给人们的身体带来一定危害,也对环境造成不利的影响。因此,通过降低端羟基树脂中的羟基含量,达到减少异氰酸酯固化剂的用量,从而在达到节约成本的同时,符合国家绿色化发展和环保的要求。本文从醇类、酸类、羟值、黏度及助剂等方面探究了聚氨酯涂料专用端羟基聚酯树脂的制备方法。结果表明:在投料量为40 kg的前提下,醇酸比为1.077,添加TMP 0.65 kg、EG 3.0 kg、IPA 0.5 kg、ADA 1.5 kg,并添加PTA和NPG等醇酸,制得羟值为24 mgKOH/g的超低羟值聚酯树脂,通过添加适量颜料、助剂,即可制得流平性能优异、机械性能优良、成本较低的聚氨酯粉末涂料。 展开更多
关键词 端羟基聚酯树脂 异氰酸酯 聚氨酯粉末涂料 流平性能 机械性能
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Mean properties of mesoscale eddies in the Kuroshio recirculation region 被引量:3
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作者 马利斌 王强 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2014年第3期681-702,共22页
Using a 19-year altimetric dataset, the mean properties and spatiotemporal variations of eddies in the Kuroshio recirculation region are examined. A total of 2 001 cyclonic tracks and 1 847 anticyclonic tracks were id... Using a 19-year altimetric dataset, the mean properties and spatiotemporal variations of eddies in the Kuroshio recirculation region are examined. A total of 2 001 cyclonic tracks and 1 847 anticyclonic tracks were identifi ed using a geometry-based eddy detection method. The mean radius was 57 km for cyclonic eddies and was 61 km for anticyclonic eddies, respectively, and the mean lifetime was about 10 weeks for both type eddies. There were asymmetric spatial distributions for eddy generation and eddy termination, which were domain-dependent. Mean eddy generation rates were 2.0 per week for cyclonic eddies and were 1.9 per week for anticyclonic eddies. Both type eddies tended to deform during their lifetime and had different propagation characteristics, which mainly propagated westward and southwestward with velocities 4.0–9.9 cm/s, in the Kuroshio recirculation region. Further discussion illustrates that the eddy westward speed maybe infl uenced by the combined effect of vertical shear of horizontal currents and nonlinearity of eddy. To better understand the evolution of eddy tracks, a total of 134 long-lived tracks(lifetime ≥20 weeks) were examined. Comparison between short-span eddies(lifetime ≥4 weeks and <20 weeks) and long-lived eddies is also conducted and the result shows that the short-span and long-lived eddies have similar time evolution. Finally, eddy seasonal variations and interannual changes are discussed. Correlation analysis shows that eddy activity is sensitive to the wind stress curl and meridional gradient of sea surface temperature on interannual timescales. Besides, the strength and orientation of background fl ows also have impacts on the eddy genesis. 展开更多
关键词 mesoscale eddies spatial distributions temporal variations potential factors
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Convective Heat Transfer Enhancement of a Rectangular Flat Plate by an Impinging Jet in Cross Flow 被引量:2
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作者 李国能 郑友取 +1 位作者 胡桂林 张治国 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第5期489-495,共7页
Experiments were carried out to study the heat transfer performance of an impinging jet in a cross flow.Several parameters including the jet-to-cross-flow mass ratio(X=2%-8%), the Reynolds number(Red=1434-5735)and the... Experiments were carried out to study the heat transfer performance of an impinging jet in a cross flow.Several parameters including the jet-to-cross-flow mass ratio(X=2%-8%), the Reynolds number(Red=1434-5735)and the jet diameter(d=2-4 mm) were explored. The heat transfer enhancement factor was found to increase with the jet-to-cross-flow mass ratio and the Reynolds number, but decrease with the jet diameter when other parameters maintain fixed. The presence of a cross flow was observed to degrade the heat transfer performance in respect to the effect of impinging jet to the target surface only. In addition, an impinging jet was confirmed to be capable of enhancing the heat transfer process in considerable amplitude even though the jet was not designed to impinge on the target surface. 展开更多
关键词 impinging jet cross flow convection heat transfer heat transfer enhancement
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Parameter Plane Synthesis and Performance Investigation of a Three-Phase Neutral-Point Clamped Bidirectional Rectifier
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作者 Nitin Langer Abdul Hamid Bhat Pramod Agarwal Tasadduq 《Journal of Energy and Power Engineering》 2012年第4期615-622,共8页
In this paper, parameter plane synthesis of a three-phase neutral-point clamped bidirectional rectifier has been performed. The converter involves one outer-loop PI voltage controller and two inner-loop PI current con... In this paper, parameter plane synthesis of a three-phase neutral-point clamped bidirectional rectifier has been performed. The converter involves one outer-loop PI voltage controller and two inner-loop PI current controllers for the closed-loop control. D-partition technique has been employed for the precise design of the voltage controller. The performance of the converter has been evaluated using MATLAB/Simulink software. An experimental prototype of converter has been developed and the experimental investigation of converter in closed-loop has been carried out. DSP DS 1104 of dSPACE has been used for real-time implementation of the designed controller. The performance of the converter has been found satisfactory using the designed controller parameters. 展开更多
关键词 ASDs (adjustable speed drives) HPFCs (high power factor converters) NPC (neutral-point clamped) converter DSP real-time simulation.
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Perovskite QLED with an external quantum efficiency of over 21%by modulating electronic transport 被引量:11
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作者 Tao Fang Tiantian Wang +3 位作者 Xiansheng Li Yuhui Dong Sai Bai Jizhong Song 《Science Bulletin》 SCIE EI CSCD 2021年第1期36-43,M0003,共9页
Perovskite quantum-dot-based light-emitting diodes(QLEDs)are highly promising for future solid-state lightings and high-definition displays due to their excellent color purity.However,their device performance is easil... Perovskite quantum-dot-based light-emitting diodes(QLEDs)are highly promising for future solid-state lightings and high-definition displays due to their excellent color purity.However,their device performance is easily affected by charge accumulation induced luminescence quenching due to imbalanced charge injection in the devices.Here we report green perovskite QLEDs with simultaneously improved efficiency and operational lifetime through balancing the charge injection with the employment of a bilayered electron transport structure.The charge-balanced QLEDs exhibit a color-saturated green emission with a full-width at half-maximum(FWHM)of 18 nm and a peak at 520 nm,a low turn-on voltage of2.0 V and a champion external quantum efficiency(EQE)of 21.63%,representing one of the most efficient perovskite QLEDs so far.In addition,the devices with modulated charge balance demonstrate a nearly 20-fold improvement in the operational lifetime compared to the control device.Our results demonstrate the great potential of further improving the device performance of perovskite QLEDs toward practical applications in lightings and displays via rational device engineering. 展开更多
关键词 Light-emitting diodes PEROVSKITE Quantum dots Charge balance Electron transport
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On the feasibility and efficacy of control traffic protection in software-defined networks 被引量:1
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作者 HU YanNan WANG WenDong +2 位作者 GONG XiangYang QUE XiRong CHENG ShiDuan 《Science China Chemistry》 SCIE EI CAS CSCD 2015年第12期40-58,共19页
Software Defined Networking (SDN) is an emerging networking paradigm that assumes a logically centralized control plane separated from the data plane. Despite all its advantages, separating the control and data plan... Software Defined Networking (SDN) is an emerging networking paradigm that assumes a logically centralized control plane separated from the data plane. Despite all its advantages, separating the control and data planes introduces new challenges regarding resilient communications between the two. That is, disconnec- tions between switches and their controllers could result in substantial packet loss and performance degradation. This paper addresses this challenge by studying the issue of control traffic protection in SDNs with arbitrary numbers of controllers. Specifically, we propose a control traffic protection scheme that combines both local rerouting and constrained reverse path forwarding protections, through which switches can locally react to fail- ures and redirect the control traffic using standby backup forwarding options. Our goal is then to find a set of primary routes for control traffic, called protected control network, where as many switches as possible can benefit from the proposed protection scheme. We formulate the protected control network problem, prove its NP-hardness, and develop an algorithm that reconciles proteetability and performance (e.g., switch-to-control latency). Through extensive simulations based on real topologies, we show that our approach significantly im- proves protectability of control traffic. The results should help further the process of deploying SDN in real-world networks. 展开更多
关键词 software-defined network PROTECTION control traffic RESILIENCE optimization
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