检索结果-南通市图书馆

FEM analysis and experimental investigation of force and chip formation on hot turning of Inconel 625

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2019年第6期15卷 853-860页

作者： asit Kumar Parida Kalipada Maity Indian Institute of Technology Delhi Department of Mechanical EngineeringIndia National Institute of Technology Rourkela Department of Mechanical EngineeringIndia

This study investigates the hot machining of Inconel 625 alloy by using flame heating under different machining conditions using finite element analysis(FEM).Turning tests are performed at different cutting speeds and heating temperatures using uncoated carbide insert by DEFORM *** reduction in cutting force and tool wear has achieved at heating conditions compared to room *** tool life is achieved at the highest cutting speed and higher heating temperature *** heating conditions of the 600℃ continuous chip is formed whereas at room temperature saw-tooth chip formation is observed.A significant agreement is achieved between simulated and experimental cutting forces and chip *** effect of feed rates and depth of cuts are also studied experimentally during turning of Inconel 625 in a systematic manner.

关键词： Hot machining Force Inconel 625 Surface roughness Chip morphology

Analysis of some critical aspects in hot machining of Ti-5553 superalloy: Experimental and FE analysis

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2019年第3期15卷 344-352页

作者： asit Kumar Parida Kalipada Maity Mechanical Engineering Department Indian Institute of Technology Delhi India National Institute of Technology Rourkela Mechanical Engineering Department India

In this study, a newly developed titanium superalloy, i.e., the Ti-5553 alloy has used for hot machining. This material replaced Ti-grade-5 alloy in the application of aerospace, automobile, and biomedical sector. However, similar to Ti-grade-5 alloy, the Ti-5553 alloy has a low thermal conductivity which makes it difficult-to-cut material categories hence, high tool wear, cutting force and bad surface finish. Hot machining of Ti-5553 has been studied at different machining condition (room and hot) using Deform-2D finite element analysis. The result from the simulation test was compared with the experimental value and reduction of cutting and thrust forces was observed. The experiment was carried out with the same input parameters as simulation, and good coherence between them observed. Additionally, cutting zone temperature, effective stress, etc. for both room and elevated the temperature are also discussed.

关键词： Ti-5553 Hot machining Cutting force Flank wear Finite element analysis

Inhibition of extracellular vesicle pathway using neutral sphingomyelinase inhibitors as a neuroprotective treatment for brain injury

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2021年第12期16卷 2349-2352页

作者： asit Kumar Santosh Kumar Department of Pharmaceutical Sciences University of Tennessee Health Science CenterMemphisTNUSA

Traumatic brain injury is a sudden trauma or blow on the head,and severe traumatic brain injury is a major cause of death and disability *** acute and chronic consequences following traumatic brain injury can lead to progressive secondary neurodegenerative changes and cognitive *** date,there is no effective pharmaceutical products for the treatment to reduce secondary damage after brain *** discovery of extracellular vesicles has attracted considerable scientific attention due to their role in cell-to-cell *** vesicles have shown their potential to carry not only biological molecules but also as a drug delivery *** a carrier of molecular information,extracellular vesicles have been involved in physiological functions as well as in the modulation of immune ***,we aim to provide new insights into the contrasting role of extracellular vesicles in the propagation of inflammatory responses after brain *** a carrier of pro-inflammatory molecules,their role as functional mediators in the pathophysiology of brain injury is discussed,addressing the inhibition of the extracellular vesicle pathway as an anti-inflammatory or neuroprotective approach to improve the outcome of both acute and chronic inflammation following brain ***,we summarize therapeutic strategies to diminish the risk the neurodegeneration post brain injury and propose that neutral sphingomyelinase inhibitors could be used as potentially useful therapeutic agents for the treatment of brain injury associated neuroinflammation.

关键词： brain injury ceramide extracellular vesicles microglia neuroinflammation neuroprotection neutral sphingomyelinase

Patterns in the relationship between acute COVID-19/long COVID-19 and quality of life:A cross-sectional study of patients attending a tertiary care hospital in Turkey

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2022年第6期15卷 274-282页

作者： Hakan Tuzun Cansu Ozbaş Burkay Budak Gizem Altunay F.N.baran Aksakal Department of Public Health Faculty of MedicineGazi UniversityAnkaraTurkey

Objective:To determine the change in the quality of life(QoL)of patients who applied to a tertiary outpatient clinic according to their COVID-19 ***:This cross-sectional study comprised 1370 *** form-12(SF-12),which includes Physical Component Summary(PCS)and Mental Component Summary(MCS)domains,was used to evaluate the *** linear regression models created using PCS-12 and MCS-12 were dependent ***:A total of 19.2% of participants had acute COVID-19,and 8.4%had long *** most common sypmtoms were fatigue(72.6%),headache(42.5%),and joint pain(39.8%)in patients with long *** model including all participants showed that long COVID-19 reduced the QoL in multivariate analysis for both MCS and PCS,while acute COVID-19 had no significant effect on the QoL comparing with those without *** that included participants with COVID-19 showed that long COVID-19 negatively affected the QoL in the multivariate model for PCS-12 and *** that were significant in the multivariate model for those who had long COVID-19 were having a chronic disease and presence of ongoing *** were disadvantaged for PCS-12 and MCS-12 in the multivariate models including all participants,and models including participants who have had *** educational group were disadvantaged for PCS-12 in the multivariate model including all *** group were also disadvantaged for PCS-12 and MCS-12 in the multivariate models including participants who had ***:In studies,acute COVID-19 and long COVID-19 should be treated as separate *** effects of long COVID-19 should be considered when providing and planning health *** effect of gender,and education,on QoL shows that health inequalities continue to be effective during the pandemic period.

关键词： Long COVID-19 Acute COVID-19 Quality of life Pandemic Health ineaqualities

关于《〈垄断资本〉一些理论含义》的最后通信

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

政治经济学季刊 2024年第1期3卷 117-133页

作者：保罗·巴兰保罗·斯威齐张雪琴当代著名马克思主义中共中央党校(国家行政学院)马克思主义学院

“最后通信”系保罗·巴兰和保罗·斯威齐于1964年2月底至3月初的往来通信,其内容主要同垄断资本缺失的理论章《一些理论含义》有关。这一章由巴兰于1962年起草,那时他们正在从事《垄断资本》的出版修订工作。关于《一些理论含义》的讨... 详细信息

“最后通信”系保罗·巴兰和保罗·斯威齐于1964年2月底至3月初的往来通信,其内容主要同垄断资本缺失的理论章《一些理论含义》有关。这一章由巴兰于1962年起草,那时他们正在从事《垄断资本》的出版修订工作。关于《一些理论含义》的讨论因巴兰于1964年3月26日溘然长逝而被迫中断。这些通信由约翰·贝拉米·福斯特编辑注释并首次公开发表~((1))。

关键词：理论含义垄断资本巴兰修订工作通信

Energy use efficiency and greenhouse gas emissions(GHG)analysis of garlic cultivation in Turkey

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2023年第4期16卷 63-67页

作者： Mehmet Fırat baran Cihan Demir Ahmet Konuralp Eliçin Osman Gökdoğan Department of Biosystem Engineering Faculty of AgricultureUniversity of SiirtSiirtTurkey Department of Mechanical and Metal Technologies Vocational School of Technical SciencesUniversity of KırklareliKırklareliTurkey Department of Agricultural Machinery and Technologies Engineering Faculty of AgricultureUniversity of DicleDiyarbakırTurkey Department of Agricultural Machinery and Technologies Engineering Faculty of AgricultureIsparta University of Applied SciencesIspartaTurkey

This study has been conducted with the purpose of determining energy use efficiency and greenhouse gas emissions of garlic cultivation during the 2020-2021 cultivation season in Adıyaman province of ***,observations and field works were performed in 134 garlic farms in the region through simple random *** garlic cultivation,energy input was calculated as 32103.20 MJ/hm^(2)and energy output was calculated as 30096 MJ/hm^(2).With regards to the three highest inputs in garlic production,46.66%of the energy inputs consisted of chemical fertilizers energy(14979.26 MJ/hm^(2)),11.29%consisted of farmyard manure energy(3625.71 MJ/hm^(2))and 10.48%consisted of human labour energy(3363.36 MJ/hm^(2)).Energy use efficiency,specific energy,energy productivity and net energy in garlic cultivation were calculated as 0.94,1.71 MJ/kg,0.59 kg/MJ,and−2007.20 MJ/hm^(2),*** total energy input consumed in garlic cultivation was classified as 27.19%direct energy,72.81%indirect energy,35.17%renewable energy and 64.87%nonrenewable *** GHG emissions and GHG ratio were calculated as 8636.60 kg CO_(2)-eq/hm^(2)and 0.46 kg CO_(2)-eq/kg,respectively.

关键词： Energy use efficiency garlic greenhouse gas emissions specific energy Turkey

L-theanine: A potential multifaceted natural bioactive amide as health supplement

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2017年第9期7卷 842-848页

作者： Rajsekhar adhikary Vivekananda Mandal Plant and Microbial Physiology and Biochemistry Laboratory Department of BotanyUniversity of Gour BangaMalda 732 103W.B.India

Natural bioactive compounds from plants are of great importance in modern therapeutics,which are used to prepare antibiotics, growth supplements or some other therapeutics. Ltheanine is such a bioactive amide amino acid presented in different plants and fungi,especially in tea. Theanine has influential effects on lifestyle associated diseases, such as diabetes, cardiovascular disorders, hypertension, stress relief, tumor suppression,menstruation and liver injury. This amino acid can maintain normal sleep and improve memory function and nullify effect of the neurotoxins. The rate of bioavailability and its medium of ingestion in the body is one of the great concerns for its additional antioxidant properties. Pharmacokinetics of the bioactive compound and its mode of action are described herewith. The biosynthesis and industrial synthesis are also reviewed to promote accelerated production of this bioactive compound in the pharmaceutical industries.

关键词： Bioactive amide Bioavailability L-theanine Lifestyle associated diseases Pharmacokinetics

Electron-acoustic supernonlinear waves and their multistability in the framework of the nonlinear Schrödinger equation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2020年第7期72卷 71-80页

作者： Alireza Abdikian Jharna Tamang asit Saha Department of Physics Malayer UniversityMalayer 65719-95863Iran Department of Mathematics Sikkim Manipal Institute of TechnologySikkim Manipal UniversityMajitarRangpoEast-Sikkim 737136India

Finite-amplitude supernonlinear electron-acoustic waves(EAWs)are investigated under the nonlinear Schrödinger(NLS)equation in a plasma system that is composed of cold electronfluid,immobile ions and q-nonextensive hot *** the wave transfiguration,the NLS equation is deduced in a dynamical *** presence of finite-amplitude nonlinear and supernonlinear EAWs is shown by phase plane *** effects of the nonextensive parameter(q)and the speed of waves(v)on different traveling wave solutions of EAWs are ***,by introducing a small external periodic force in the dynamical system,multistability behaviors of EAWs under the NLS equation are shown for the first time in classical plasmas.

关键词： electron-acoustic wave dynamical system phase plane analysis nonextensive plasma

Optimization of synchronized frequency and voltage control for a distributed generation system using the Black Widow Optimization algorithm

在线全文

学校读者我要写书评

暂无评论

Clean Energy 2022年第1期6卷 105-118页

作者： baran Sadeghi Nima Shafaghatian Reza Alayi Mamdouh El Haj Assad Farhad Zishan Hasan Hosseinzadeh Electrical Engineering Department Ghazvin BranchIslamic Azad UniversityGhazvinIran Electrical Engineering Department Zanjan UniversityZanjanIran Department of Mechanics Germi BranchIslamic Azad UniversityGermiIran Sustainable and Renewable Energy Engineering Department University of SharjahP O Box 27272SharjahUAE Department of Electrical Engineering Sahand University of TechnologyTabrizIran Department of Mathematics Ardabil BranchIslamic Azad UniversityArdabilIran

A distributed generation network could be a hybrid power system that includes wind-diesel power generation based on induction generators(IGs)and synchronous generators(SGs).The main advantage of these systems is the possibility of using renewable energy in their *** most important challenge is to design the voltage-control loop with the frequency-control loop to obtain optimal responses for voltage and frequency *** this work,the voltage-control loop is designed by an automatic voltage regulator.A linear model of the hybrid system has also been developed with coordinated voltage and frequency *** frequency response and voltage deviations are compared for different load disturbances and different reactive *** gains of the SG and the static volt-ampere reactive compensator(SVC)controllers in the IG terminal are calculated using the Black Widow Optimization(BWO)algorithm to insure low frequency and voltage *** BWO optimization algorithm is one of the newest and most powerful optimization methods to have been introduced so *** results showed that the BWO algorithm has a good speed in solving the proposed objective function.A 22%improvement in time adjustment was observed in the use of an optimal ***,an 18%improvement was observed in the transitory values.

关键词： microgrid voltage and frequency control Black Widow Optimization algorithm dynamic response smart grid