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| 1 | Cr_3C_2粒径对等离子堆焊铁基合金层组织与耐磨性能的影响显示文摘在低碳钢表面利用等离子堆焊技术分别制备Fe50堆焊层及添加40%(质量分数)微米和纳米Cr_3C_2的(Fe50+40%微米/纳米Cr_3C_2)复合堆焊层,比较研究添加不同粒径的Cr_3C_2对Fe50合金堆焊层的显微组织与磨损性能的影响。采用X射线衍射仪(XRD)分析堆焊层的相组成,利用扫描电镜(SEM)和能谱分析仪(EDS)观察堆焊层的显微组织形貌及微区成分,通过显微硬度计测试了堆焊层的硬度分布,使用滑动磨损及冲击磨损试验机分别考察了复合堆焊层的磨损性能。结果表明:Fe50等离子堆焊层组织主要由柱状晶α-Fe及其间的网状共晶α-Fe+Cr_(23)C_6组成;而Fe+40%微米/纳米Cr_3C_2堆焊层凝固方式为过共晶,由大量的先共晶碳化物及其间细密、均匀的枝晶与共晶组织组成,并增加了γ-Fe、Cr_7C_3和未熔Cr_3C_2等相;但Fe+40%纳米Cr_3C_2涂层比Fe+40%微米Cr_3C_2涂层析出更多且细小、致密的先共晶碳化物。与Fe50等离子堆焊涂层相比,Fe+40%微米Cr_3C_2涂层的显微硬度、滑动磨损性能及冲击磨损性能分别提高了21%、1.5倍和0.8倍;而Fe+40%纳米Cr_3C_2涂层的显微硬度、滑动磨损性能及冲击磨损性能则分别提高了34.1%、2.4倍和1.7倍,表面的犁沟和剥落及塑性变形明显减少,耐磨性能显著提高。因此,添加纳米Cr_3C_2颗粒可以显著细化铁基合金等离子堆焊层的显微组织并提升其耐磨性能。 | 肖轶 徐呈艺 Ryou Min 曹健 | 2018 | 材料导报2018，32，24： | 3 |
| 2 | Free-space optical neural network based on thermal atomic nonlinearity显示文摘As artificial neural networks(ANNs)continue to make strides in wide-ranging and diverse fields of technology,the search for more efficient hardware implementations beyond conventional electronics is gaining traction.In particular,optical implementations potentially offer extraordinary gains in terms of speed and reduced energy consumption due to the intrinsic parallelism of free-space optics.At the same time,a physical nonlinearity—a crucial ingredient of an ANN—is not easy to realize in free-space optics,which restricts the potential of this platform.This problem is further exacerbated by the need to also perform the nonlinear activation in parallel for each data point to preserve the benefit of linear free-space optics.Here,we present a free-space optical ANN with diffraction-based linear weight summation and nonlinear activation enabled by the saturable absorption of thermal atoms.We demonstrate,via both simulation and experiment,image classification of handwritten digits using only a single layer and observed 6% improvement in classification accuracy due to the optical nonlinearity compared to a linear model.Our platform preserves the massive parallelism of free-space optics even with physical nonlinearity,and thus opens the way for novel designs and wider deployment of optical ANNs. | Albert Ryou James Whitehead Maksym Zhelyeznyakov Paul Anderson Cem Keskin Michal Bajcsy Arka Majumdar | 2021 | Photonics Research2021，9，4： | 2 |
| 3 | Efficacy of preoperative endoscopic nasobiliary drainage for hilar cholangiocarcinoma显示文摘 | Norikazu Arakura Mari Takayama Yayoi Ozaki Masafumi Maruyama Yoshimi Chou Ryou Kodama Yasuhide Ochi Hideaki Hamano Takenari Nakata Shouji Kajikawa Eiji Tanaka Shigeyuki Kawa | 2009 | Journal of Hepato - Biliary - Pancreatic Surgery2009，，4： | 2 |
| 4 | Long-Term Follow-Up of Autoimmune Pancreatitis: Characteristics of Chronic Disease and Recurrence显示文摘 | Shigeyuki Kawa Hideaki Hamano Yayoi Ozaki Tetsuya Ito Ryou Kodama Yoshimi Chou Mari Takayama Norikazu Arakura | 2009 | Clinical Gastroenterology and Hepatology2009，，11： | 2 |
| 5 | 高性能粉末冶金连杆在V6发动机中的应用显示文摘今天,减轻连杆重量对满足现代内燃机的各项要求是至关重要的。为了降低产品成本、改善NVH特性和提高轴瓦的可靠性,现代汽车公司(HMC)已采用粉末冶金锻造连杆取代传统的热锻连杆。通过提高质量和降低成本的优化设计,开发了轻型连杆。值得注意的是,粉末冶金锻造连杆的质量比传统的热锻连杆的质量小17.7%,而且,连杆大头质量比传统型连杆大头的质量小22.5%。采用轻型连杆可减小曲轴系的质量,从而也减小了主要运动件的质量。由于减小了质量,轴瓦可靠性和NVH特性均可提高。HMC在一台新型V6发动机上进行了疲劳、刚度和装机耐久性等对比试验。 | Paek S Y Ryou H S Oh J S 沈永生 | 1999 | 国外内燃机1999，31，5： | 2 |
| 6 | Development of the modified k-ε turbulence model of power-law fluid for engineering applications显示文摘In the present study,a high Reynolds number version of a turbulence model was proposed by using drag reduction to analyze the turbulent flows of power-law fluid for engineering applications.In order to determine the model constants in the constitu-tive equation,numerical simulation was conducted under the same conditions that were applied to obtain the experiment re-sults and previous turbulence models.For validation of the modified turbulence model,numerical simulations were performed for power-law fluids of different viscosities.The results of the modified k-ε turbulence model showed better agreement with the experimental results than those of the standard k-ε turbulence model.In addition,computation time and computer resource of the modified k-ε turbulence model were reduced by about one third as compared to the low Reynolds number model for power-law fluids. | RO Kyoungchul RYOU HongSun | 2012 | Science China(Technological Sciences)2012，55，1： | 2 |
| 7 | The importance of chloride content at the concrete surface in assessing the time to corrosion of steel in concrete structures显示文摘 | K.Y. Ann J.H. Ahn J.S. Ryou | 2008 | Construction and Building Materials2008，，1： | 2 |
| 8 | Electrode pattern design of piezoelctric sensors and actuators using genetic algorithms显示文摘 | Ryou J K Park K Y Kim S J | 1998 | AIAA Journal1998，36，2： | 1 |
| 9 | Gametogenesis and sexual maturation ofthe surf clam Mactra veneriformis on the west coast of Korea 显示文摘 | Chung E Y Ryou D K | 2000 | Malacologia2000，42，： | 1 |
| 10 | Raman spectroscopic analysis on the solubility mechanism of La3+ in GeS2-Ga2S3glasses显示文摘 | Heo J Yoon J M Ryou S Y | 1998 | J Non Cryst Solids1998，238，1： | 1 |
| 11 | Current status of endoluminal bariatrie procedures for primary and revision indications 显示文摘 | Ryou M Ryan MB Thompson CC | 2011 | Gastrointest Endosc Clin N Am2011，21，2： | 1 |
| 12 | Tissue adhesives:a review显示文摘 | Ryou M Thompson CC | | 0，，： | 1 |
| 13 | Radiation therapy for intrahepatic recurrence after hepatectomy for hepatocellular carcinoma显示文摘 | Masaaki Otsuka Kiyosi Ohara Yasutsugu Takada Takanori Ueda Souichirou Murata Ryou Ushijima Shinya Adachi Takesi Todoroki | 2003 | International Journal of Clinical Oncology2003，，3： | 1 |
| 14 | Gametogenesis and sexualmaturation of the surf clam Mactra veneriformis on the west coast of korea显示文摘 | Chung E Y Ryou D K | 2000 | Malacologia2000，42，12： | 1 |
| 15 | Efficiency droop due to electron spill-over and limited hole injection in Ⅲ-nitride visible light-emitting diodes employing lattice-matched InAlN electron blocking layers显示文摘 | Choi S Ji M H Kim J Kim H J Satter M M Yoder P D Ryou J H Dupuis R D Fischer A M Ponce F A | | 0，，16： | 1 |
| 16 | Variation in the chloride threshold level for steel corrosion in concrete arising from different chloride sources显示文摘 | RYOU J S ANN K Y | 2008 | Magazine of Con- crete Research2008，60，： | 1 |
| 17 | Mussel-inspired adhesive binders for high-performance silicon nanoparticle anodes in lithium-ion batteries 显示文摘 | M H Ryou J Kim I Lee | 2013 | Adv Mater2013，25，11： | 1 |
| 18 | An experimental and numerical study on fire suppression using a water mist in an enclosure显示文摘 | Sung Chan Kim Hong Sun Ryou | 2003 | Building and Environment2003，38，11： | 1 |
| 19 | Prions in skeletal muscle 显示文摘 | Bosque P J Ryou C Telling G | 2002 | Proc Natl Acad Sci USA2002，99，： | 1 |
| 20 | Evaluating an Optimal Gastric Closure Method for Transgastric Surgery显示文摘 | Ryou M Pai R D Sauer J S | 2007 | Surg Endose2007，21，4： | 1 |
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