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A double-layer radiative cooling coating that utilizes the refractive index difference between layers to achieve extremely high solar reflectivity

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Science China Technological Sciences 2024年第10期67卷 3182-3189页

作者： WANG fuqiang LI ChunZhe YANG ZhenNing xie WeiXin LI Xiang XU ZengHui YAN YuYing CHENG ZiMing School of Energy Science and Engineering Harbin Institute of Technology School of New Energy Harbin Institute of Technology at Weihai China Construction Eco-Environmental Protection Technology Co. Ltd. Faculty of Engineering University of Nottingham

Passive daytime radiative cooling（PDRC） technology has great potential in reducing cooling energy consumption. In order to further improve the spectral performance of PDRC coatings, current researchers mostly focus on the selection and size design of functional particles, while ignoring the optical properties enhancement effect caused by the interlayer binder. In this study, based on the principle that the refractive index difference between layers enhanced the backscattering performance of the solar spectrum, we proposed and manufactured a double-layer PDRC coating with polyvinylidene difluoride（PVDF） as the filmforming material in the upper layer and polydimethylsiloxane（PDMS） as the film-forming material in the lower layer, both filled with Al2O3and SiO2particles. The double-layer PDRC coating exhibited excellent spectral performance that a high solar reflectivity of 98% and an emissivity of 0.95 at the “atmospheric window” band. In comparison, the solar spectrum reflectivity of the single-layer PDRC coatings based on PVDF and PDMS of the same thickness was 95% and 94.7%, respectively. Outdoor tests showed that the PDRC coating achieved a temperature decrease of up to 7.1℃ under direct sunlight at noon time. In addition, the PDRC coating had excellent weather resistance, water resistance, and other basic properties. This article opens up a new idea and provides methodological guidance for the design of double-layer PDRC coatings.

关键词： double-layer radiative cooling coating spectral modulation interlayer refractive index solar energy radiative transfer

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非血管化髂骨移植重建下颌骨缺损的临床分析

华西口腔医学杂志 2012年第4期30卷 411-413页

作者：谢富强孙健兰州大学第二医院口腔科兰州730030

目的对非血管化髂骨移植重建下颌骨缺损的病例进行临床回顾性分析,探讨其治疗效果及手术注意事项。方法选择因肿瘤和外伤致下颌骨缺损后行自体非血管化髂骨同期移植重建术修复的34例患者为研究对象,分析其手术方法、术后效果及并发症的... 详细信息

目的对非血管化髂骨移植重建下颌骨缺损的病例进行临床回顾性分析,探讨其治疗效果及手术注意事项。方法选择因肿瘤和外伤致下颌骨缺损后行自体非血管化髂骨同期移植重建术修复的34例患者为研究对象,分析其手术方法、术后效果及并发症的发生情况。结果采用游离非血管化髂骨同期移植重建下颌骨缺损的34例患者中,小钛板双排内固定31例,重建板内固定3例。34例患者中,成功病例27例(79.41%),良好病例3例(8.82%),失败病例4例(11.76%)。失败原因均为感染而取出植入骨。结论自体非血管化髂骨移植重建术是下颌骨缺损重建的重要方法之一,内固定的方式有小钛板和重建板。

关键词：下颌骨缺损非血管化下颌骨重建髂骨移植内固定

预防性Dyractflow流动复合体充填窝沟龋的临床效果

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实用口腔医学杂志 2005年第3期21卷 409-411页

作者：谢富强兰州大学第二医院口腔科 730030

目的:观察评价Dyract flow 流动复合体用于窝沟可疑龋、初龋预防性充填的临床疗效.方法:对145 例7～24 岁患者的(牙合)面窝沟龋在磨除龋损的牙体组织后,用 Dyract flow 流动复合体对龋损部位及未龋损的窝沟区域作预防性充填封闭术,对侧... 详细信息

目的:观察评价Dyract flow 流动复合体用于窝沟可疑龋、初龋预防性充填的临床疗效.方法:对145 例7～24 岁患者的(牙合)面窝沟龋在磨除龋损的牙体组织后,用 Dyract flow 流动复合体对龋损部位及未龋损的窝沟区域作预防性充填封闭术,对侧同名牙或邻牙也有窝沟龋者用银汞合金充填作对照.结果:随访4 年后发现该方法充填材料保留率较高,能有效阻止龋病的进一步发展.其龋病及继发龋发病率与对照组有显著性差异.但充填材料保留率的远期效果不如银汞合金,在3、4 年时有统计学差异.结论:预防性Dyract flow 流动复合体充填术可作为治疗窝沟龋的银汞合金的替代治疗方法之一,长期随诊进行补涂效果则更佳.

关键词：窝沟龋 Dyract flow流动复合体治疗效果

140GHz带状注弯折波导SU-8工艺与传输特性（英文）

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强激光与粒子束 2015年第8期27卷 142-148页

作者：谢辅强丁桂甫赵小林程萍上海交通大学电子信息与电气工程学院上海200240

对140GHz带状注弯折波导的色散特性和耦合阻抗进行了仿真。CST微波工作室的仿真表明该波导在140GHz时,波导内电磁波的轴向相速度为0.227c,且140GHz频率附近色散特性平坦。波导的耦合阻抗在140GHz时为5Ω左右。CST粒子工作室注波互作用... 详细信息

对140GHz带状注弯折波导的色散特性和耦合阻抗进行了仿真。CST微波工作室的仿真表明该波导在140GHz时,波导内电磁波的轴向相速度为0.227c,且140GHz频率附近色散特性平坦。波导的耦合阻抗在140GHz时为5Ω左右。CST粒子工作室注波互作用的仿真结果表明该弯折波导在140GHz处的功率增益为24.6dB。该弯折波导带状电子注的设计保证了该波导的加工工艺与MEMS微加工工艺兼容。通过SU-8UV-LIGA工艺实现了对该波导的微型加工。测试结果表明该波导的反射损耗S11与插入损耗S21分别为-28dB和-1.2dB。实测的输出功率增益达到23dB。测试结果和仿真结果的一致性表明该弯折波导设计的合理性,同时也验证了多步SU-8UV-LIGA工艺可以实现对该波导的高精度加工。

关键词：弯折波导仿真微加工测试

Mass extinctions, their causes and consequences: an interview with Douglas *** and Shuzhong Shen

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National Science Review 2024年第1期11卷 66-70页

作者： Shucheng xie State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences at Wuhan

‘Mass extinctions’ have been a hot topic for several decades. What triggers a mass extinction? How does a mass extinction impact the evolution of life? How does our ecosystem recover after a mass extinction? These questions attracted the interest of both scientists and the public *** spoke to two renowned researchers in the field of mass extinctions: Prof. Douglas H. Erwin from the National Museum of Natural History of the USA, and Prof. Shuzhong Shen from Nanjing University, China.

关键词： Stratigraphy

Turbulence Statistics of Thermo-Buoyancy Supercritical Fuel Flow in a Regenerative Cooling Channel

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Journal of Thermal Science 2024年第1期33卷 126-137页

作者： SUN Feng xie Gongnan School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an 710072China Department of Thermal Engineering Tsinghua UniversityBeijing 100084China

Active regenerative cooling with supercritical hydrocarbon fuel is considered as the most promising thermal protection *** existence of buoyancy force would lead to strongly anisotropic flow and thermal transport *** is closely related to the cooling performance of the *** elucidate the mechanisms of turbulent transport,the large eddy simulation(LES) was performed to assess turbulence statistics within different turbulence *** results indicated that the buoyancy and inertial force together dominated the change of turbulent ***,the spatial thermal buoyancy effect significantly suppressed the vertical velocity *** is due to the laminar motion caused by the buoyancy force,thereby weakening the thermal *** the statistics of velocity fluctuation,it was found that the buoyancy force and inertial force greatly weaken the vertical and streamwise velocity fluctuation,*** the statistics of thermal transport,the results pointed out that the near-wall heat transport characteristics need to be paid more *** thickness of the temperature mixing boundary layer led to the attenuation of vertical heat flux,which inhibited vertical temperature diffusion and predisposed to extreme conditions of heat transfer *** results can enhance the academic understanding of the heat transfer mechanism of supercritical fluids,and give guidance for further applications of thermal protection.

关键词： active regenerative cooling large eddy simulation(LES) buoyancy force turbulence statistics

Output feedback stabilization of stochastic high-order planar nonlinear systems with stochastic inverse dynamics and output-constraint

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Science China(Information Sciences) 2024年第3期67卷 182-196页

作者： Ruiming xie Shengyuan XU Nanjing University of Science and Technology School of Automation

In this paper, we solve the output feedback control problem of stochastic high-order planar nonlinear systems with output constraint and stochastic integral input-to-state stability(SiISS) inverse dynamics. By employing a key coordinate transformation, a stochastic nonlinear system with output constraint and SiISS inverse dynamics is converted into an unconstrained system. By skillfully constructing an observer and adopting SiISS small-gain conditions, we develop a new output feedback control design and analysis method, and prove that all the closed-system signals are bounded almost surely, the output constraint is not violated almost surely, and the equilibrium point of the closed-loop system is stochastically asymptotically stable.

关键词： stochastic high-order planar nonlinear system outputconstraint stochastic inverse dynamics output feedbackstabilization stochastic integral input-to-state stability(SiISS)

复合氰基丙烯酸酯-骨形态发生蛋白生物胶预防大鼠牙槽嵴萎缩的实验研究

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华西口腔医学杂志 2012年第6期30卷 584-588,593页

作者：张贇谢富强王新胡朝昶孙健兰州大学第二医院口腔科兰州730030 兰州大学口腔医学院兰州730000

目的制备复合氰基丙烯酸酯-骨形态发生蛋白(BMP)生物胶,并植入大鼠拔牙窝观察其预防牙槽嵴萎缩的效果。方法选用Wistar大鼠54只,随机分为3组:实验组(复合氰基丙烯酸酯-BMP生物胶组)、对照组(壳聚糖温敏性胶体组)、空白对照组。拔除大鼠... 详细信息

目的制备复合氰基丙烯酸酯-骨形态发生蛋白(BMP)生物胶,并植入大鼠拔牙窝观察其预防牙槽嵴萎缩的效果。方法选用Wistar大鼠54只,随机分为3组:实验组(复合氰基丙烯酸酯-BMP生物胶组)、对照组(壳聚糖温敏性胶体组)、空白对照组。拔除大鼠下颌切牙后,实验组和对照组在牙槽窝内即刻植入复合氰基丙烯酸酯-BMP生物胶、单纯壳聚糖温敏性胶体,空白对照组则不植入任何材料。3组动物在植入后3、6、9周处死,分离切取下颌骨,用高频钼靶扫描仪获得图像信息,使用Image-Pro Plus软件处理图像,得到剩余牙槽嵴相对高度和牙槽窝相对光密度,组织学观察牙槽窝内的成骨情况。结果术后3、6、9周,实验组的剩余牙槽嵴相对高度和牙槽窝相对光密度均高于对照组和空白对照组(P<0.05);组织学观察显示实验组牙槽窝成骨多于对照组和空白对照组。结论复合氰基丙烯酸酯-BMP生物胶可以用于预防拔牙术后剩余牙槽嵴萎缩,其临床应用前景广阔。

关键词：骨形态发生蛋白氰基丙烯酸酯壳聚糖牙槽嵴萎缩

Fixed-time stabilization of output-constrained stochastic high-order nonlinear systems

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Science China(Information Sciences) 2024年第4期67卷 5-20页

作者： Ruiming xie Shengyuan XU Nanjing University of Science and Technology School of Automation

In this study, the fixed-time stabilization problem of stochastic high-order nonlinear systems with output constraint and high-order and low-order nonlinearities is addressed. A new coordinate transformation is employed to directly convert output-constrained stochastic systems into an equivalent unconstrained *** fully extracting the characteristics of system nonlinearities and using the stochastic fixed-time stability theorem, a new design and analysis method is constructed to guarantee that the trivial solution of the closed-loop system is stochastically fixed-time stable while fulfilling the output constraint.

关键词： stochastic high-order nonlinear system outputconstraint high-order and low-order nonlinearity fixed-timestabilization finite-time stabilization