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The damage mechanism and deterioration characteristics of acid-corroded sandstone: an experimental study

Arabian Journal of Geosciences 2022年第6期15卷 1-18页

作者： Huo, runke Liang, Yanling Li, Shuguang Miao, Zizhen Qiu, Tian School of Civil Engineering Xi’an University of Architecture and Technology Xi’an China Shaanxi Key Lab of Geotechnical and Underground Space Engineering Xi’an China Post-Doctoral Research Workstation China Railway 20th Bureau Group Co. Ltd Xi’an China R&D Center of Plateau Tunnel Construction Technology and Equipment China Railway 20th Bureau Group Co. Ltd Xi’an China

Because of the long-term interaction with polluted groundwater, the physicomechanical characteristics of rock have deteriorated. In this paper, experimental investigations were conducted to shed light on the effects of acid types, pH values, and immersion periods on physicomechanical properties, microstructure change, and energy characteristics of sandstone. Besides, the essence of mechanical deterioration of corroded sandstone was revealed based on the energy evolution law, and the chemical damage mechanism of sandstone subjected to acid solutions was concluded in the theoretical context of chemical kinetics. The results showed that acid corrosion would cause the increase of P-wave velocity, porosity, peak strain, the decrease of characteristic stresses, elastic modulus, strain energy, and the change of internal microstructure and mineral content. The same exponential function could express the relationship between damage variables based on P-wave velocity or porosity and corrosion time. Moreover, the effects became evident as pH values declined and immersion periods extended, especially for HCl solution.

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Cell-type continuous electromagnetic radiation system generating millimeter waves for active denial system applications

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defence technology（防务技术） 2022年第10期18卷 1895-1913页

作者： Sun-Hong Min Ohjoon Kwon Matlabjon Sattorov Seontae Kim In-Keun Baek Seunghyuk Park ranjan Kumar Barik Anirban Bera dongpyo Hong Seonmyeong Kim Bong Hwan Hong Chawon Park Sukhwal Ma Minho Kim Kyo Chul Lee Yong Jin Lee Han Byul Kwon Young Joon Yoo Sang Yoon Park Gun-Sik Park Korea Institute of Radiological and Medical Sciences(KIRAMS) Seoul01812South Korea Institute for Basic Science Center for Axion and Precision Physics ResearchDaejeon34141South Korea Center for THz-Driven Biomedical Systems Department of Physics and AstronomyCollege of Natural SciencesSeoul National UniversitySeoul08826South Korea Center for Applied Electromagnetic Research Advanced Institute of Convergence TechnologySuwonGyeonggi-do16229South Korea R&D Department Seoul-TeracomInc.Suwon16229South Korea Mechatronics R&D Center Samsung Electronics Co.Ltd.Hwasung18448South Korea Hanwha Corporation Gumi730-030South Korea Council of Scientific and Industrial Research Central Electronics Engineering Research InstitutePilani333031India Home Economics Education/Biosystems and Biomedical Sciences Korea UniversitySeoul02841South Korea Current affiliation of Seontae Kim:Young IN ACE 1 F60Anyangcheondong-roDongan-guAnyang-siGyeonggi-do14042South Korea.

The cell-type continuous electromagnetic radiation system is a demonstration device capable of generating high-power millimeter electromagnetic waves of a specific wavelength and observing their effects on living *** irradiates a biological sample placed in a 30×30×50 cm^(3)cell with electromagnetic waves in the 3.15-mm-wavelength region(with an output of≥1 W)and analyzes the temperature change of the sample.A vacuum electronic device-based coupled-cavity backward-wave oscillator converts the electron energy of the electron beam into radiofrequency(rF)energy and radiates it to the target through an antenna,increasing the temperature through the absorption of rF energy in the *** system causes pain and ultimately reduces combat power.A cell-type continuous electromagnetic radiation system consisting of four parts—an electromagnetic-wave generator,a highvoltage power supply,a test cell,and a system controller—generates an rF signal of≥1 W in a continuous waveform at a 95-GHz center frequency,as well as a chemical solution with a dielectric constant similar to that of the skin of a living *** increase of 5°C lasting approximately 10 s was confirmed through an experiment.

关键词： Millimeter waves Terahertz waves coupled-cavity backward wave oscillator(CCBWO) Cell-type continuous electromagnetic radiation Active denial system(AdS) directed-energy weapon(dEW)

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Effect of different Ultrasound Powers on the Stability of Native/Thermally denatured Myofibrillar Protein-Inulin Emulsion

SSRN

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SSrN 2024年

作者： Wang, Mengman Ma, Chaowei Li, Yan Zhang, Zhiguo Huang, Ming Sun, Jingxin College of Food Science & Engineering Qingdao Agricultural University Qingdao266109 China Shandong Research Center for Meat Food Quality Control Qingdao Agricultural University Zhucheng Waimao Co. Ltd. Qingdao266109 China School of Food Science and Engineering Qilu University of Technology Shandong Academy of Sciences Ji’nan250353 China Nanjing210095 China National R&D Branch Center for Poultry Meat Processing Technology Nanjing Huangjiaoshou Food Sci. & Tech. Co. Ltd. Nanjing210095 China

Native/thermally denatured myofibrillar protein ( MPs/TMPs) combined with inulin (In) can improve its stability in water, but it also has certain limitations. The stability of MPs/TMPs-In emulsion was studied by applying ultrasound at different powers (200-800 W). After ultrasound treatment, the droplet size decreased, especially the particle size of MPs-600 W inulin emulsion reached 1 µm. In addition, by measuring the oxidation stability of oil, it was found that ultrasound could inhibit emulsion oxidation, and the PV of MPs-600 W droplets reached 5.37 ± 0.18 mmol/Kg and TBSAT reached 2.37 ± 0.19 µmol/Kg. However, at the same ultrasound power, the dispersion of TMPs-In droplets is not as good as that of MPs-In droplets, indicating that thermal denaturing is not conducive to emulsion stability. Therefore, the introduce of ultrasound to ameliorate the stability of MPs/TMPs-In emulsion is effective, especially at 600 W ultrasound power, the emulsion shows good stability. © 2024, The Authors. All rights reserved.

关键词： Emulsification

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design Harmonic drive for Application in robot Joint

Design Harmonic Drive for Application in Robot Joint

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International conference on Mechanical and Electronics engineering (ICMEE)

作者： ThanhTrung Trang ThanhLong Pham QiNing Yin QingWei Wang YueMing Hu WeiGuang Li School of Automation Science and Engineering South China University of Technology Guangzhou China Faculty of Mechanical Engineering Thai Nguyen University of Technology Thai Nguyen Viet Nam Machinery R&D Technology Center Zhongshan Mltor CNC Technology Co. Ltd Zhongshan China School of Mechanical and Automotive Engineering South China University of Technology Guangzhou China

In industrial robot design, selecting a motor and reducer is one of the essential elements in the design process. The typical mechanical reducer type is a gear train or planetary gear set. Unfortunately, the gear train and the planetary gear have a meager gear ratio, while their weight is too heavy, the transmission repetition accuracy is low and has a high backlash. On the other hand, the harmonic reducer system developed from the transmission gear has an elastic strain wave, which gives a better gear ratio per weight than those two gear systems. In this paper, a harmonic gear reducer is designed according to the transmission requirements and applied rotation to the base of a Puma 560 industrial robot. The harmonic drive is designed under gear physical requirements and robot techniques properties. The required gear ratio of the rotary joint of 1/50, gear geometry design, manufacturing, calculation, and simulation of strength, the safety factor, and experimental results have verified the designs.

关键词： Torque Gears Service robots Prototypes Harmonic analysis Numerical simulation Safety

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design of Gearbox Monitoring System Based on Edge computing

Design of Gearbox Monitoring System Based on Edge Computing

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International conference on Artificial Intelligence and Advanced Manufacturing (AIAM)

作者： daixing Lu Guoyao Gao Ye Shen Zhichao Tong School of Mechanical Engineering Shanghai Institute of Technology Shanghai China R&D Department IFKA Solutions GmbH Darmstadt Germany Equipment Maintenance Center National Energy Group Co. Ltd. Ordos China

With the advent of Industry 4.0 and the Industrial Internet, the Internet of Things (IoT) development of applications is booming, the mining machinery working environment is extremely harsh, therefore, the requirements of the performance, quality, durability, reliability of its gearbox is pretty high, to meet these requirements, real-time monitoring is becoming a demanded task. For this purpose, a gearbox monitoring system based on edge computing is established. In the paper at hand, a novel Jacobi-type data parallel processing method is proposed, with which, the efficiency and life of the gearbox are calculated through the edge service APP. Traditional methods by solely utilizing cloud computing cannot effectively accomplish this task. Using cloud-edge collaboration technology, the Web application in scenarios such as intelligent mining is designed, which can grasp the operating status of equipment in the entire mining area, unify scheduling and orchestration of computing resources, update the monitoring model on edge computing nodes, and process and generate effective data of machinery and equipment in real-time at the edge computing device. It reduces the operation and maintenance cost, solves the problem of monitoring data congestion caused by insufficient data bandwidth, and ensures a stable and safe operation of mining machinery.

关键词： Cloud computing costs collaboration Bandwidth Maintenance engineering real-time systems Internet of Things

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Synergistic Effects between Potassium Bubbles and High-Energy-rate Forging Enabled Ultrahigh Strength and ductility of Tungsten Alloy

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SSrN 2023年

作者： dang, Ning Lian, Youyun Song, Jiupeng dai, Shaowei Yan, Binyou Fan, Feng Wang, Jianbao Liu, Xiang School of Materials Science and Engineering Xihua University Sichuan Chengdu610039 China Southwestern Institute of Physics Sichuan Chengdu610064 China Xiamen Tungsten Co. Ltd. Fujian Xiamen361009 China China National R&D Centre for Tungsten Technology Fujian Xiamen361009 China

The intrinsic brittleness of tungsten (W) significantly restricts its application as the primary material for plasma-facing components. In this study, we propose a novel approach to enhance both the strength and ductility of W-based alloys by leveraging the synergistic effects between potassium (K) bubbles and high-energy-rate forging. K doping was introduced into W, followed by a two-step high-energy-rate forging (HErF) process. This results in a higher density and smaller size of K bubbles along the grain boundaries, as well as laminated matrix grains with refined sizes and deformation textures, and an increased density of low-angle grain boundaries. consequently, the prepared W alloys exhibit a substantially reduced ductile-to-brittle transition temperature within the range of room temperature to 50 °C, along with a notable ultimate tensile strength of up to 1393 MPa. Impressively, these alloys also demonstrate remarkable elongation at 200 °C, reaching a value as high as 33.12%. The outstanding strength and extraordinary ductility observed in these alloys underscore their potential for commercialization in the field of nuclear fusion engineering. © 2023, The Authors. All rights reserved.

关键词： Textures

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Microstructure Evolution and Properties of Hot rolling K-doped Tungsten Sheets

SSRN

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SSrN 2023年

作者： Liang, Mengxia dai, Shaowei ren, Ping Song, Jiupeng Yan, Binyou Lian, Youyun Feng, Fan Wang, Jianbao Liu, Xiang Wan, Weicai School of Materials Science and Engineering Xihua University Sichuan Chengdu610039 China Xiamen Tungsten Co. Ltd. Fujian Xiamen361009 China China National R&D Centre for Tungsten Technology Fujian Xiamen361009 China Southwestern Institute of Physics Sichuan Chengdu610064 China

Potassium doped tungsten (AKS-W) is a promising plasma facing material (PFM) in nuclear reactors application, whereas its up-scaling manufacturing poses a challenge. In this study, large-scale AKS-W sheets with 85 ppm potassium (K) dopant were manufactured by powder metallurgy and hot rolling through a mass production route in the real industry to investigate the evolution of K bubbles and microstructure and their effects on the properties of W. compared with pure tungsten (PW) sheet counterparts, the AKS-W sheets showed compatible densification and thermal conductivity at room temperature. doping with K led to evident hardness increase both in the sintered and deformed states, which was owing to microstructure refining caused by the pinning effect of K on the grain boundaries and dislocations during sintering and thermomechanical deformation. K bubble evolution mechanisms of AKS-W blocks during sintering and dynamic break-up of K ellipsoids during hot-rolling were discussed. © 2023, The Authors. All rights reserved.

关键词： Potassium

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Long-term efficacy,safety and biocompatibility of a novel sirolimus eluting iron bioresorbable scaffold in a porcine model

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Bioactive Materials 2024年第9期39卷 135-146页

作者： Ya-Nan Gao Hong-Tao Yang Zi-Feng Qiu Feng Qi Qian-Hong Lu Jian-Feng Zheng Zi-Wei Xi Xin Wang Li Li Gui Zhang de-Yuan Zhang Yu-die Lu Hai-Ping Qi Hong Qiu run-Lin Gao Yu-Feng Zheng Department of Cardio-Metabolic Medicine Center Fuwai HospitalNational Center for Cardiovascular DiseasesChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina Department of Cardiology Coronary Artery Disease CenterFuwai HospitalNational Center for Cardiovascular DiseasesChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina Beijing Key Laboratory of Pre-clinical Research and Evaluation for Cardiovascular Implant Materials Animal Experimental CenterFuwai HospitalNational Center for Cardiovascular DiseasesChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina Department of Pathology Fuwai HospitalNational Center for Cardiovascular DiseasesChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina School of Engineering Medicine Beihang UniversityBeijingChina R&D Center Biotyx Medical(Shenzhen)Co.Ltd.ShenzhenChina Department of Cardiology Fuwai Yunnan HospitalChinese Academy of Medical SciencesAffiliated Cardiovascular Hospital of Kunming Medical UniversityKunmingChina Peking University Health Science Center BeijingChina Department of Cardiology Beijing Tsinghua Changgung HospitalBeijingChina Department of Cardiology Beijing Anzhen HospitalCapital Medical UniversityBeijing Institute of Heart Lung and Blood Vessel DiseasesBeijingChina School of Materials Science and Engineering Peking UniversityBeijingChina

Iron is considered as an attractive alternative material for bioresorbable scaffolds(BrS).The sirolimus eluting iron bioresorbable scaffold(IBS),developed by Biotyx Medical(Shenzhen,China),is the only iron-based BrS with an ultrathin-wall *** study aims to investigate the long-term efficacy,safety,biocompatibility,and lumen changes during the biodegradation process of the IBS in a porcine model.A total of 90 IBSs and 70 cobaltchromium everolimus eluting stents(EES)were randomly implanted into nonatherosclerotic coronary artery of healthy mini *** multimodality assessments including coronary angiography,optical coherence tomography,micro-computed tomography,magnetic resonance imaging,real-time polymerase chain reaction(PCr),and histopathological evaluations,were performed at different time *** was no statistical difference in area stenosis between IBS group and EES group at 6 months,1year,2 years and 5 *** the scaffolded vessels narrowed at 9 months,expansive remodeling with increased mean lumen area was found at 3 and 5 *** IBS struts remained intact at 6 months,and the corrosion was detectable at 9 *** 5 years,the iron struts were completely degraded and absorbed in situ,without in-scaffold restenosis or thrombosis,lumen collapse,aneurysm formation,and chronic *** local or systemic toxicity and abnormal histopathologic manifestation were found in all *** from real-time PCr indicated that no sign of iron overload was reported in scaffolded ***,the IBS shows comparable efficacy,safety,and biocompatibility with EES,and late lumen enlargement is considered as a unique feature in the IBS-implanted vessels.

关键词： Bioresorbable scaffold Sirolimus eluting iron bioresorbable scaffold Preclinical study completely bioresorbable Late lumen enlargement

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Visual Module r&d of the Intelligent Grabbing System of WIFI Module

Visual Module R&D of the Intelligent Grabbing System of WIFI...

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International conference on Application of Intelligent Systems in Multi-modal Information Analytics, MMIA 2020

作者： Ma, Shufang Wu, Jiang Jiao, Shuangben Xue, Bin Engineering and Technology R&D Center of Mechanical and Electrical in Colleges of Shandong Qingdao Binhai University QingdaoShandong266555 China School of Mechanical and Electrical Engineering Qingdao Binhai University QingdaoShandong266555 China Qingdao Zhongzhuang Vision Automation System Control Co. Ltd. QingdaoShandong266555 China

ISBN: (纸本)9783030514303

WiFi module intelligent grabbing system based on visual guidance is established by taking MV-CH120-10GM industrial camera and Siemens S7-200smartPLC as the hardware basis designated to realize identification and positioning grabbing of WiFi module. Hardware selection and imaging processing is studied based on visual module, and visual identity and positioning algorithm is developed by taking VisionPro9.0 as the platform. Meanwhile, logical judgment on imaging processing result is carried out by using the software Vision Studio C#. Besides, visual windows is used for inspecting image and data display. Through experimental verification, it is ultimately indicated that the visual algorithm features higher identification and positioning accuracy and satisfies the requirements of the grabbing system. © 2021, Springer Nature Switzerland AG.

关键词： computer vision

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Underbalanced MPd of an exploratory well in tight and extra-low permeability reservoir

Underbalanced MPD of an exploratory well in tight and extra-...

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SPE Middle East Oil and Gas Show and conference 2019, MEOS 2019

作者： Chen, Peng Zhou, Yingcao Wang, Junjie Chen, Lei Li, Wanjun Yang, Guobin CNPC Engineering Technology R and D Co. Ltd. China CNPC Chuanqing Drilling Engineering Co. Ltd. China

ISBN: (纸本)9781613996393

Tight and extra-low permeability reservoir was usually explored by use of normal underbalanced drilling if the wellbore is stable and the formation pressure is clear. However, precise underbalanced MPd is the optimal technical solution in case the borehole is unstable and the formation pressure is unclear. Moreover, the precise underbalanced MPd would be effective for reservoir protection, enhancement of hydrocarbon discovery, improvement of rOP as well as reduction of well control risk. No oil and gas show were found by previous conventional drilling in a tight granitic basement of Indonesia. The first exploratory well was planned to explore the broken belt of the basement to discover the oil and gas zone, increase drilling efficiency, prevent lost circulation at crushed zone of the basement and minimize drilling troubles by utilization of precise underbalanced MPd in the potential target zone. Underbalanced MPd was achieved by use of low density water-in-oil drilling fluid, and the bottomhole underbalanced pressure fluctuation was accurately and effectively controlled. Underbalanced MPd operation was smoothly completed. drilling with ignition under balanced managed pressure, connecting triples under balanced managed pressure, and tripping under balanced managed pressure were implemented. Slight under balanced condition of the bottomhole pressure during MPd operation was realized. The backpressure of the wellhead was accurately controlled between 55-135psi during precise MPd operation. 57 times of total accumulate successful ignition lasted 240 hours, which accounts for 80% of the total drilling time. The rate of penetration in tight target granitic formation under balanced drilling was improved and reached 10.8ft/hr. Neither losses nor overflow were detected during underbalanced MPd. Safe and high efficient drilling was realized. Good oil and gas show were observed. Abundant natural gas produced during underbalanced MPd. The basement hydrocarbon reservoir has been

关键词： Efficiency

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