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Thermal and mechanical behavior of casting copper alloy wheel during wheel and belt continuous casting process

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China Foundry 2024年第1期21卷 82-90页

作者： Kun gao Yan Peng School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

To investigate the thermal and mechanical behavior of casting wheel,a two-dimensional thermoelastic-plastic finite element model was used to predict the temperature,stress and distortion distribution of the casting wheel during the wheel and belt continuous casting *** effects of grinding thickness and casting speed on the thermal and mechanical behaviors of the center of the hot face of the casting wheel were discussed in *** each rotation,the casting wheel passes through four different spray *** results show that the temperature distribution of the casting wheel in different spray zones is similar,the temperature of the hot face is the highest and the temperature reaches the peak in the spray zoneⅢ.The stress and distortion depend on the temperature distribution,and the maximum stress and distortion of the hot face are 358.2 MPa and 1.82 mm,*** temperature at the center of the hot face decreases with increasing grinding thickness and increases with increasing casting speed.

关键词： casting wheel finite element model grinding thickness casting speed hot face spray zones

Late Holocene hydroclimatic variations at Lake Hurleg， Northeastern Tibet Plateau

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Journal of Earth Science 2024年

作者： Aiying Cheng Junqing Yu yun Li haicheng Wei Chunliang gao Lisha Zhang Key Laboratory of Green and High-end Utilization of Salt Lake Resources， Qinghai Institute of Salt Lakes， Chinese Academy of Sciences Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes haixi Prefecture Salt Lake Administration of Qinghai Province

High-resolution， continuous late Holocene lacustrine records are scarce in the Qaidam Basin， but is of especially important for our understanding the future climate variability in the western China. Here， we use grain size， element content and XRD-identified data from the Lake Hurleg in the eastern Qaidam Basin to present the late Holocene climate variability， which have been temporally constrained using210Pb-，137Cs- and AMS14C dating. Our records demonstrate that decreased precipitation climate occurred at ～800-1000 yr and ～1300-1800 yr intervals， and increased precipitation occurred at ～354-800 yr，～1000-1300 yr and ～1800 yr to the present. The results show that the Qaidam Basin has undergone a process of warming and humidification since the Industrial Revolution， which is consistent with the meteorological records. The climate in the northeastern Qaidam Basin is dominated by the Asian monsoon.

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Numerical simulation of fluid flow and free surface fluctuations during wheel and belt casting process

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Journal of Iron and Steel Research International 2024年第5期31卷 1117-1126页

作者： Kun gao Yan Peng National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao066004HebeiChina

The unstable fluid flow and severe free surface fluctuations in the wheel and belt caster can affect the quality of the cast *** lower level height tends to entrap inclusions in the molten *** the other hand,the higher level height makes the production process more dangerous due to the overflow of high temperature fluid from the mold.A computational model of the molten metal pouring process was *** transient fluid flow and free surface fluctuations behavior were calculated using the three-dimensional large eddy simulation model and the volume of fluid *** results show that the flow velocity of the main jet gradually decreases under the influence of the low kinetic energy fluid in the *** is an obvious oscillation in the tail of the jet,while the flow field is asymmetric in *** jet is closer to the inside radius side due to the Coanda effect,and there is a recirculation zone on the inside radius and the outside radius respectively,according to the 10 s time-averaged *** with the industrial observation and simulation results,the shape of the free surface is a wave that varies with *** addition,the free surface height is lowest and the flow velocity is highest in the region near the jet.

关键词： Fluid flow Free surface Wheel and belt caster Large eddy simulation Volume of fluid method

胆囊切除术患者胆的俞穴、募穴及下合穴的红外热成像特征研究

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中华中医药杂志 2016年第5期31卷 2017-2020页

作者：高允海王军龙许斌辽宁中医药大学沈阳110032 辽宁中医药大学附属第四医院沈阳110101

目的:研究胆囊切除术患者胆的俞穴、募穴及下合穴的红外热成像特征。方法:收集行胆囊切除术患者30例作为观察组;健康自愿受试者30名作为对照组。采用医用红外热成像技术,对所有受试者胆的背俞穴(胆俞)、募穴(日月)、下合穴(阳陵泉)的红... 详细信息

目的:研究胆囊切除术患者胆的俞穴、募穴及下合穴的红外热成像特征。方法:收集行胆囊切除术患者30例作为观察组;健康自愿受试者30名作为对照组。采用医用红外热成像技术,对所有受试者胆的背俞穴(胆俞)、募穴(日月)、下合穴(阳陵泉)的红外温度进行对比分析。结果:1对照组的日月、胆俞及阳陵泉穴,左右温度的比较差异无统计学意义;2观察组术前和术后的胆俞、阳陵泉穴双侧温度对比无差异,而日月穴双侧温度对比有差异(P<0.05),且均呈现右侧高于左侧的规律;3观察组术前与术后比较,日月、胆俞及阳陵泉穴的温度差异均有统计学意义(P<0.05);4观察组术前和术后的日月、胆俞及阳陵泉穴的温度均高于对照组,差异有统计学意义(P<0.05)。结论:特定穴具有反应脏腑疾病演变的相关性和特异性;胆囊切除可明显改善胆囊病变引起的胆腑功能失常,但对机体胆腑功能仍有一定影响。

关键词：胆囊切除术红外热成像募穴背俞穴下合穴经穴特异性

Desert ecological control and ecological industrial construction: Practice and inspiration from China

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China Geology 2024年第3期7卷 596-600页

作者： Xue-zheng gao Lu Liu yun-tao Shang Fan-yu Qi Development and Research Center China Geological SurveyMinistry of Natural ResourcesBeijing 100037China National Geological Archives of China Beijing 100037China China Construction Engineering Design&Research Institute Co. Ltd.Beijing 100037China

Desertification poses significant threats to the ecological security and sustainable economic and social development of countries worldwide. In China, existing desertified land primarily lies between 35°–50°N, covering arid and semi-arid regions and a total area of 1.688×106 km^(2), which represents 17.58%of the total territorial area of the country (Fig. 1).

关键词： Desert ecological primarily

On the core entropy of Newton maps

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Science China Mathematics 2024年第1期67卷 77-128页

作者： Yan gao Department of Mathematics Shenzhen UniversityShenzhen 518060China

In this paper,we define the core entropy for postcritically-finite Newton maps and study its continuity within this *** show that the entropy function is not continuous in this family,which is different from the polyn... 详细信息

关键词： core entropy extended Newton graph critical marking polynomial Newton map

Durable poly(binaphthyl-co-p-terphenyl piperidinium)-based anion exchange membranes with dual side chains

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Journal of Energy Chemistry 2024年第2期89卷 324-335,I0008页

作者： Weiting gao Xuelang gao Qiugen Zhang Aimei Zhu Qinglin Liu Department of Chemical&Biochemical Engineering Fujian Provincial Key Laboratory of Theoretical and Computational ChemistryThe College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Department of Chemistry Pohang University of Science and Technology(POSTECH)Pohang 790-784South Korea

Building well-developed ion-conductive highways is highly desirable for anion exchange membranes(AEMs).Grafting side chain is a highly effective approach for constructing a well-defined phaseseparated morphological structure and forming unblocked ion pathways in AEMs for fast ion *** of side chains can further enhance phase separation due to the superhydrophobic nature of fluorine ***,their electronic effect on the alkaline stability of side chains and membranes is rarely ***,fluorine-containing and fluorine-free side chains are introduced into the polyaromatic backbone in proper configuration to investigate the impact of the fluorine terminal group on the stability of the side chains and membrane *** poly(binaphthyl-co-p-terphenyl piperidinium)AEM(QBNp TP)has the highest molecular weight and most dimensional stability due to its favorable backbone arrangement among ortho-and meta-terphenyl based ***,by introducing both a fluorinated piperidinium side chain and a hexane chain into the p-terphenyl-based backbone,the prepared AEM(QBNp TP-QFC)presents an enhanced conductivity(150.6 m S cm^(-1))and a constrained swelling at 80℃.The electronic effect of fluorinated side chains is contemplated by experiments and *** results demonstrate that the presence of strong electro-withdrawing fluorine groups weakens the electronic cloud of adjacent C atoms,increasing OH^(-)attack on the C atom and improving the stability of piperidinium *** QBNp TP-QFC possesses a robust alkaline stability at 80℃(95.3%conductivity retention after testing in 2 M Na OH for 2160 h).An excellent peak power density of 1.44 W cm^(-2)and a remarkable durability at 80℃(4.5%voltage loss after 100 h)can be observed.

关键词： Anion exchange membranes Backbone structure Fluorinated side chain Alkaline stability

Cardiac remodeling in patients with atrial fibrillation reversing bradycardia-induced cardiomyopathy:A case report

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World Journal of Clinical Cases 2024年第7期12卷 1339-1345页

作者： De-Kui gao Xiang-Lin Ye Zhen Duan Hong-Yang Zhang Tao Xiong Zheng-Hong Li hai-Feng Pei Department of Cardiology Jiangyou Second People's HospitalJiangyou 621701Sichuan ProvinceChina Department of Cardiology The General Hospital of Western Theater CommandChengdu 610083Sichuan ProvinceChina Department of Clinical Medicine Southwest Medical UniversityLuzhou 646000Sichuan ProvinceChina Department of Special Inspection Jiangyou Second People's HospitalJiangyou 621701Sichuan ProvinceChina

BACKGROUND Bradycardia-induced cardiomyopathy(BIC),which is a disease resulting from bradycardia,is characterized by cardiac chamber enlargement and diminished cardiac *** correction of bradycardia can allow for significant improvements in both cardiac function and structure;however,this disease has been infrequently *** this case,we conducted a longitudinal followup of a patient who had been enduring BIC for more than 40 years to heighten awareness and prompt timely diagnosis and rational *** SUMMARY A woman who presented with postactivity fatigue and dyspnea was diagnosed with bradycardia at the age of *** she had no obvious symptoms,she did not receive any treatment to improve her bradycardia during the 42-year follow-up,except for the implantation of a temporary pacemaker during labor induction *** time progressed,the patient's heart gradually expanded due to her low ventricular rate,and she was diagnosed with *** 2014,the patient developed atrial fibrillation,her ventricular rate gradually increased,and her heart shape gradually returned to *** report describes the cardiac morphological changes caused by the heart rate changes in BIC patients older than 40 years,introduces another possible outcome of BIC,and emphasizes the importance of early intervention in treating *** BIC can induce atrial fibrillation,causing an increased ventricular rate and leading to positive cardiac remodeling.

关键词： Bradycardia cardiomyopathy Heart rate Atrial fibrillation Cardiac dilatation Case report

Perspective of Calcium Imaging Technology Applied to Acupuncture Research

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Chinese Journal of Integrative Medicine 2024年第1期30卷 3-9页

作者： LI Sha LIU yun ZHANG Nan LI Wang XU Wen-jie XU Yi-qian CHEN Yi-yuan CUI Xiang ZHU Bing gao Xin-yan Institute of Acupuncture and Moxibustion China Academy of Chinese Medical SciencesBeijing(100700)China

Acupuncture, a therapeutic treatment defined as the insertion of needles into the body at specific points(ie, acupoints), has growing in popularity world-wide to treat various diseases effectively, especially acute and chronic pain. In parallel, interest in the physiological mechanisms underlying acupuncture analgesia, particularly the neural mechanisms have been increasing. Over the past decades, our understanding of how the central nervous system and peripheral nervous system process signals induced by acupuncture has developed rapidly by using electrophysiological methods. However, with the development of neuroscience, electrophysiology is being challenged by calcium imaging in view field, neuron population and visualization in vivo. Owing to the outstanding spatial resolution, the novel imaging approaches provide opportunities to enrich our knowledge about the neurophysiological mechanisms of acupuncture analgesia at subcellular, cellular, and circuit levels in combination with new labeling, genetic and circuit tracing techniques. Therefore, this review will introduce the principle and the method of calcium imaging applied to acupuncture research. We will also review the current findings in pain research using calcium imaging from in vitro to in vivo experiments and discuss the potential methodological considerations in studying acupuncture analgesia.

关键词： acupuncture research calcium imaging optical imaging nervous system