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A new method for evaluating wedges of steel plates and strips

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Journal of Iron and Steel Research International 2024年第7期31卷 1719-1735页

作者： Xiao-bao Ma Xiao-xin Ma Tao Wang zhong-kai ren Yu-cheng ren College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Ministry of Education Engineering Research Center of Advanced Metal Composite Forming Technology and Equipment Taiyuan University of TechnologyTaiyuan 030024ShanxiChina National Key Laboratory of Metal Forming Technology and Heavy Equipment Taiyuan University of TechnologyTaiyuan 030024ShanxiChina China National Heavy Machinery Research Institute Co. Ltd.Xi'an 710018ShaanxiChina Faculty of Mechanical Engineering Hebei University of ArchitectureZhangjiakou 075000HebeiChina

To overcome the inaccuracy problem of the traditional wedge evaluation of steel plates and strips caused by the ran-domness of the thicknesses of two local points and improve the reliability of the wedge index,the double-centroid method for the wedge evaluation was proposed,and a model based on the centroid theory was ***,an integral model for the discrete thickness values of the cross-section profiles was *** discussion focused on the distinct characteristics of the two-point method,asymmetric method,and double-centroid method in evaluating the asymmetric distribution of *** three methods were employed to evaluate the wedge values of both the theoretical and measured cross-sections of steel plates and strips,and the accuracies of three wedge evaluation models were analyzed and *** results showed that the double-centroid method objectively reflects the degree and variation characteristics of the wedge values of the cross-sections of steel plates and strips,and this method is feasible,reliable,and outstanding.

关键词： Steel plate and strip Wedge Two-point method Double-centroid method Reliability

Interfacial bonding mechanism of Cu/Al composite plate produced by corrugated cold roll bonding

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Rare Metals 2021年第5期40卷 1284-1293页

作者： Tao Wang Xiang-Yu Gao Zhi-Xiong Zhang zhong-kai ren Yan-Yang Qi Jing-Wei Zhao College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Engineering Research Center for Metal Composites Forming Process and Equipment Taiyuan University of TechnologyTaiyuan 030024China TYUT-UOW Joint Research Center Taiyuan University of TechnologyTaiyuan 030024China

Corrugated cold roll bonding(CCRB) produces metal composite plate with improved mechanical properties compared with conventional methods,but the interfacial mechanism is not fully ***,Cu/Al composite plate with good plate shape was produced by CCRB,and the bonding mechanism and strength along the corrugated interface were studied by experiments and finite element *** results showed that the average bonding strength of Cu/Al composite plate produced by CCRB was nearly twice that of conventional composite plate at an average reduction of 40% during *** friction shear stresses occurred at the interface of the corrugated composite plate,which promoted the plastic deformation of the metals and accelerated the rupture of the brittle interfacial *** backscattered diffraction analysis showed that higher degrees of grain elongation and refinement occurred in the matrices at the front waist and trough due to the stronger normal and shear ***-dispersive spectroscopy line scans showed that the thickest atomic diffusion layer occurred at the front *** present combination of experimental and computational analyses provides insights into the underlying mechanism of mechanically improved metal composites prepared by CCRB.

关键词： Corrugated cold roll bonding Cu/Al composite Bonding strength Friction shear stress Grain refinement Atomic diffusion layer

Mechanism of high-energy pulsed current-assisted rolling of 08AL carbon steel ultra-thin strip

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Journal of Iron and Steel Research International 2024年第2期31卷 416-427页

作者： zhong-kai ren Ya-nan Xu Jia-zhao Chen He Li Rui-lin Yuan Zhen-hua Wang Tao Wang Xiao Liu College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan030024ShanxiChina Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment(Ministry of Education) Taiyuan University of TechnologyTaiyuan030024ShanxiChina National Key Laboratory of Metal Forming Technology and Heavy Equipment China National Heavy Machinery Research Institute Co.Ltd.Xi’an710016ShaanxiChina

To improve the plastic deformation performance of a 08AL carbon steel ultra-thin strip,a pulsed electric field was integrated into the plastic processing of the ultra-thin strip,and the effects of high-energy current on its deformation ability were ***-assisted tensile tests were employed,and the results clarified that the pulsed current could reduce the activation energy of faults and promoted dislocation slip within grains and at grain boundaries,leading to a decrease in the deformation resistance of the metal and an increase in its plastic *** the current density of 2.0 A/mm2,the yield strength,tensile strength,and elongation of the rolled sample reached 425 MPa,467 MPa,and 12.5%,*** the rolling process,it was found that the pulsed current promoted the dynamic recrystallization of the ultra-thin strip,reduced its dislocation density and deformation resistance,and promoted the coordinated deformation of the metal.

关键词： 08AL ultra-thin strip High-energy pulsed current Mechanical property Dislocation density Dynamic recrystallization

Effect of cooling rate on solidification microstructure and mechanical properties of TiB2-containing TiAl alloy

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Transactions of Nonferrous Metals Society of China 2021年第2期31卷 391-403页

作者： Yi JIA Zhi-dong LIU Sha LI Hao-ming YAO zhong-kai ren Tao WANG Jian-chao HAN Shu-long XIAO Yu-yong CHEN College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Advanced Metal Composite Forming Technology and Equipment Engineering Research Center of Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China TYUT-UOW Joint Research Centre Taiyuan University of TechnologyTaiyuan 030024China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China

Effects of cooling rate and 0.25 at.%TiB2 addition on solidification microstructure and mechanical properties of Ti−48Al−2Cr−2Nb alloys fabricated by the investment casting with different thicknesses were *** results show that with the cooling rate increasing from 37 to 2×102 K/s,the solidification path of the studied alloys is *** grain size of the matrix alloy is refined from 650 to 300μm,while the grain size of Ti−48Al−2Cr−2Nb−TiB2 is reduced from 550 to 80μ*** lamellar spacing of matrix alloy is reduced from 360 to 30 nm with increasing the cooling rate from 37 to 2×102 K/s,while TiB2 addition shows little refinement effect on the lamellar ***−48Al−2Cr−2Nb−TiB2 sample under medium cooling rate(69 K/s)exhibits superior microhardness(HV 550)and ultimate tensile strength(570 MPa)among the studied *** refined grain size,lamellar spacing and fine TiB2 particles could account for the favorable mechanical properties of the studied TiB2-containing *** microstructure evolution was discussed in light of cooling rate,constitutional supercooling and borides addition.

关键词： titanium aluminides TiB2 cooling rate microstructure evolution mechanical properties

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玻璃体手术联合曲安奈德在眼后段外伤的应用

中国实用眼科杂志 2007年第2期25卷 161-162页

作者：钟凯人刘文陈子林广东惠州市中心人民医院眼科惠州516001 中山大学中山眼科中心

摘要目的探讨玻璃体视网膜手术联合曲安奈德（TA）玻璃体腔注射治疗眼后段外伤的疗效。方法眼后段外伤患者设联合组30例30眼、单纯组35例35眼。两组患者新鲜穿通伤首先清创缝合，1w～2w后行玻璃体切割术。合并白内障先切除混浊晶状体，... 详细信息

摘要目的探讨玻璃体视网膜手术联合曲安奈德（TA）玻璃体腔注射治疗眼后段外伤的疗效。方法眼后段外伤患者设联合组30例30眼、单纯组35例35眼。两组患者新鲜穿通伤首先清创缝合，1w～2w后行玻璃体切割术。合并白内障先切除混浊晶状体，有异物者取异物，伴有网脱者行气液交换或重水展平视网膜，裂孔厅眼内光凝或冷凝，C3F8或硅油填充。在关闭切口前联合组患者加用TA4mg玻璃体腔注射。结果眼后段损伤有玻璃体积血、视网膜出血、异物（联合组20例、单纯组21例）、视网膜脱赢两组发生率（P〉0.05）。两组患者眼后段异物均能取出。术后视力分别提高、不变、下降，联合组为76．7％、16．7％、6．7％；单纯组为60.0％、28.6％、11．4％。联合组比单纯组要好（P〈0．05）。术后并发症：第1天前房反应2＋以上联合组56.7％低于单纯组85．7％（P〈0．05）;高眼压和白内障发生率差异不明显（P〉0．05）；视网膜脱离联合组低于单纯组（P〈0.05）。结论玻璃体视网膜手术联合TA玻璃体腔注射比单纯手术治疗眼后段外伤疗效要好。

关键词：玻璃体手术曲安奈德眼外伤并发症

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羊膜移植在泪小管重建术中的临床应用

眼科新进展 2009年第3期29卷 224-226页

作者：张世华蔡树泓钟凯人广东省惠州市中心人民医院眼科 516008

目的观察比较显微镜下泪小管断端吻合联合羊膜植入术与常规显微镜下泪小管断端吻合术治疗泪小管断裂的效果。方法60例泪小管断裂吻合术中,32例采用泪小管断端吻合联合羊膜植入术(研究组),28例采用常规显微镜下泪小管断端吻合术(对照组)... 详细信息

目的观察比较显微镜下泪小管断端吻合联合羊膜植入术与常规显微镜下泪小管断端吻合术治疗泪小管断裂的效果。方法60例泪小管断裂吻合术中,32例采用泪小管断端吻合联合羊膜植入术(研究组),28例采用常规显微镜下泪小管断端吻合术(对照组)。结果术后随访观察18个月,置管期内1个月治愈率比较:研究组87.50%(28/32),对照组57.14%(16/28)(P<0.01);拔管后1a治愈率比较:研究组为90.63%(29/32),对照组为69.86%(19/28)(P<0.05),研究组优于对照组。结论泪小管断端吻合联合羊膜植入术能提高泪小管术后的早期修复和最终治愈率,为泪小管手术提供了一个新的治疗途径。

关键词：羊膜移植泪小管断裂吻合术硅胶管

Inhibitory gamma-aminobutyric acidergic neurons in the anterior cingulate cortex participate in the comorbidity of pain and emotion

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Neural Regeneration Research 2025年第10期20卷 2838-2854页

作者： Lu Guan Mengting Qiu Na Li Zhengxiang Zhou Ru Ye Liyan zhong Yashuang Xu Junhui ren Yi Liang Xiaomei Shao Jianqiao Fang Junfan Fang Junying Du Department of Neurobiology and Acupuncture Research Third School of Clinical MedicineZhejiang Chinese Medical UniversityHangzhouZhejiang ProvinceChina Key Laboratory for Research of Acupuncture Treatment and Transformation of Emotional Diseases Third School of Clinical MedicineZhejiang Chinese Medical UniversityHangzhouZhejiang ProvinceChina Fuchun Community Health Service Center of Fuyang District HangzhouZhejiang ProvinceChina

Pain is often comorbid with emotional disorders such as anxiety and *** of the anterior cingulate cortex has been implicated in pain and pain-related negative emotions that arise from impairments in inhibitory gamma-aminobutyric acid *** review primarily aims to outline the main circuitry(including the input and output connectivity)of the anterior cingulate cortex and classification and functions of different gamma-aminobutyric acidergic neurons;it also describes the neurotransmitters/neuromodulators affecting these neurons,their intercommunication with other neurons,and their importance in mental comorbidities associated with chronic pain *** understanding on their role in pain-related mental comorbidities may facilitate the development of more effective treatments for these ***,the mechanisms that regulate gamma-aminobutyric acidergic systems remain *** is also unclear as to whether the mechanisms are presynaptic or *** exploration of the complexities of this system may reveal new pathways for research and drug development.

关键词： anterior cingulate cortex anxiety chronic pain circuit communication comorbidity depression gamma-aminobutyric acidergic neurons parvalbumin neurons synaptic transmission

Iron-handling solute carrier SLC22A17 as a blood-brain barrier target after stroke

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Neural Regeneration Research 2025年第11期20卷 3207-3208页

作者： Xueqi ren Wenlu Li Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province School of Pharmaceutical SciencesZhejiang Chinese Medical UniversityHangzhouZhejiang ProvinceChina Neuroprotection Research Laboratories Departments of Radiology and NeurologyMassachusetts General HospitalHarvard Medical SchoolBostonMAUSA

The pathophysiology of ischemic stroke is complex and multifactorial,involving various forms of cell death such as apoptosis,autophagy,and necrosis.A recent study suggests that oxidative and inflammatory stress can induce ferroptosis,a specialized form of cell death characterized by the accumulation of lipid peroxides dependent on intracellular iron overload(Li and Jia,2023).

关键词： death specialized barrier

Optimizing the key parameter to accelerate the recovery of AMOC under a rapid increase of greenhouse gas forcing

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Atmospheric and Oceanic Science Letters 2025年第1期18卷 39-45页

作者： Haolan ren Fei Zheng Tingwei Cao Qiang Wang International Center for Climate and Environment Science(ICCES) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina College of Oceanography Hohai UniversityNanjingChina CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences and Pilot National Laboratory for Marine Science and Technology(Qingdao)QingdaoChina

Atlantic Meridional Overturning Circulation(AMOC)plays a central role in long-term climate variations through its heat and freshwater transports,which can collapse under a rapid increase of greenhouse gas forcing in climate *** studies have suggested that the deviation of model parameters is one of the major factors in inducing inaccurate AMOC *** this work,with a low-resolution earth system model,the authors try to explore whether a reasonable adjustment of the key model parameter can help to re-establish the AMOC after its *** a new optimization strategy,the extra freshwater flux(FWF)parameter is determined to be the dominant one affecting the AMOC’s *** traditional ensemble optimal interpolation(EnOI)data assimilation and new machine learning methods are adopted to optimize the FWF parameter in an abrupt 4×CO_(2) forcing experiment to improve the adaptability of model parameters and accelerate the recovery of *** results show that,under an abrupt 4×CO_(2) forcing in millennial simulations,the AMOC will first collapse and then re-establish by the default FWF parameter ***,during the parameter adjustment process,the saltier and colder sea water over the North Atlantic region are the dominant factors in usefully improving the adaptability of the FWF parameter and accelerating the recovery of AMOC,according to their physical relationship with FWF on the interdecadal timescale.

关键词： Recovery of AMOC 4×CO_(2)forcing Key parameter Parameter estimation Data assimilation Machine learning