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Challenges and opportunities in the production of magnesium parts by directed energy deposition processes

Journal of Magnesium and Alloys 2024年第5期12卷 1663-1686页

作者： Gürel Cam ali Günen Iskenderun Technical University Faculty of Engineering and Natural SciencesDepartment of Mechanical Engineering31200 Iskenderun-HatayTurkey Iskenderun Technical University Faculty of Engineering and Natural SciencesDepartment of Metallurgy and Materials Engineering31200 Iskenderun-HatayTurkey

Mg-alloys have gained considerable attention in recent years for their outstanding properties such as lightweight,high specific strength,and corrosion resistance,making them attractive for applications in medical,aerospace,automotive,and other transport ***,their widespread application is hindered by their low formability at room temperature due to limited slip *** Mg-alloys have low mechanical properties due to the presence of casting defects such as porosity and anisotropy in addition to the high *** casting methods benefit from established process optimization techniques for these problems,additive manufacturing methods are increasingly replacing casting methods in Mg alloys as they provide more precise control over the microstructure and allow specific grain orientations,potentially enabling easier optimization of anisotropy properties in certain *** metal additive manufacturing(MAM)technology also results in some manufacturing defects such as inhomogeneous microstructural evolution and porosity and additively manufactured Mg alloy parts exhibit lower properties than the wrought parts,they in general exhibit superior properties than the cast ***,MAM is a promising technique to produce Mg alloy *** energy deposition processes,particularly wire arc directed energy deposition(WA-DED),have emerged as an advantageous additive manufacturing(AM)technique for metallic materials including magnesium alloys,offering advantages such as high deposition rates,improved material efficiency,and reduced production costs compared to subtractive ***,the inherent challenges associated with magnesium,such as its high reactivity and susceptibility to oxidation,pose unique hurdles in the application of this *** review paper delves into the progress made in the application of DED technology to Mg-alloys,its challenges,and ***,the predominant imperfections,notably inhomo

关键词： Additive manufacturing DED processes Arc-DED Wire arc additive manufacturing(WAAM) 3-D printing High deposition rate

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Utilizing auxin dwarf genes to optimize seed yield and lodging resistance in rapeseed

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The Crop Journal 2024年第4期12卷 1208-1221页

作者： Hongxiang Lou Yan Peng Chunyun Wang Zongkai Wang Bowen Zhao ali Mahmoud el-Badri Maria Batool Bo Wang Jing Wang Zhenghua Xu Jie Zhao Jie Kuai Guangsheng Zhou MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River Hubei Hongshan LaboratoryCollege of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan 430070HubeiChina National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural UniversityWuhan 430070HubeiChina Field Crops Research Institute Agricultural Research CenterGiza 12619Giza GovernorateEgypt

Direct-seeding rapeseed production at high plant density raises the risk of *** investigated the use of dwarf genes to improve rapeseed plant architecture to balance yield and *** genotypes with different plant architectures(dwarf sca^(HS5),semi-dwarf+/sca^(HS5),and tall ^(HS5))were evaluated under varying nitrogen rates(N1,N2,and N3:120,240,and 360 kg N ha^(-1))and plant densities(D1,D2,and D3:15,45,and 75 plants m^(-2))from 2019 to *** results showed that increasing N rate positively influenced yield while decreasing lodging resistance in all *** plant density(D2-D3)enhanced lodging resistance and yield in sca^(HS5) and+/sca^(HS5),but reduced yield in ^(HS5).Compared to the two parents,+/sca^(HS5) exhibited moderate expressions of IAA3,GH3.15,and SAUR30 in stems under N2D3,resulting in reduced plant height and increased ***,+/sca^(HS5) had a thicker silique layer than ^(HS5) by 14.7%,and it had a significant correlation between branch height/angle and *** N rate led to increased lignin and pectin contents,while cellulose content *** plant density resulted in greater stem cellulose content and CSLA3/7 expression in sca^(HS5) and+/sca^(HS5),but decreased in ^(HS5).Compared to ^(HS5),+/sca^(HS5) exhibited higher expressions of ARAD1 and GAUT4,along with a 51.1%increase in pectin content,leading to improved lodging resistance under ***,+/sca^(HS5) showed a 46.4%higher yield and 38.9%lodging resistance than ^(HS5) under N2D3,while sca^(HS5) demonstrated strong lodging resistance but lower yield ***,this study underscores the potential of utilizing auxin dwarf genes to optimize the trade-off between yield and lodging resistance in rapeseed and the possibility of maximizing yield potential by optimizing the plant architecture of+/sca^(HS5) through nitrogen reduction and dense planting.

关键词： Rapeseed Plant density Nitrogen Lodging Auxin

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Detection of internal crack growth in polyethylene pipe using guided wave ultrasonic testing

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 319-329页

作者： Jay Kumar Shah Hao Wang Said el-Hawwat Centre of Advanced Infrastructure and Transportation RutgersThe State University of New JerseyNJ 08854USA Department of Civil and Environmental Engineering RutgersThe State University of New JerseyNJ 08854USA

Despite the success of guided wave ultrasonic inspection for internal defect detection in steel pipes,its application on polyethylene(PE)pipe remains relatively *** growth of internal cracks in PE pipe severely affects its pressure-holding capacity,hence the early detection of internal cracks is crucial for effective pipeline maintenance *** study extends the scope of guided wave-based ultrasonic testing to detect the growth of internal cracks in a natural gas distribution PE *** experiments and a finite element model were planned to study the wave-crack interaction at different stages of axially oriented internal crack growth with a piezoceramic transducer-based setup arranged in a pitch-catch *** dispersion analysis supplemented with preliminary experiments was performed to isolate the optimal inspection frequency,leading to the selection of the T(0,1)mode at 50-kHz for the investigation.A transmission index based on the energy of the T(0,1)mode was developed to trace the extent of simulated crack *** findings revealed an inverse linear correlation between the transmission index and the crack depth for crack growth beyond 20%crack depth.

关键词： polyethylene pipes internal cracks guided wave ultrasonic testing torsional modes finite element modeling

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Thermal analysis of the Rindler-Schwarzschild black hole via corrected entropy

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Communications in Theoretical Physics 2024年第9期76卷 95-106页

作者： Allah Ditta Xia Tiecheng Riasat ali aliÖvgün Department of Mathematics Shanghai University and Newtouch Center for Mathematics of Shanghai UniversityShanghai200444China Physics Department Eastern Mediterranean UniversityFamagusta99628 North Cyprus via Mersin 10Turkiye

In this study,we investigate the thermodynamic characteristics of the Rindler–Schwarzschild black hole *** analysis encompasses the examination of energy emission,Gibbs free energy,and thermal *** calculate various quantities such as the Hawking temperature,geometric mass,and heat capacity to assess the local and global thermodynamic *** temperature of the black hole is determined using the first law of thermodynamics,while the energy emission rate is evaluated as *** computing the Gibbs free energy,we explore the phase transition behavior exhibited by Rindler–Schwarzschild black hole,specifically examining the swallowing ***,we derive the corrected entropy to investigate the influence of thermal fluctuations on small and large black ***,we compare the impact of correction terms on the thermodynamic system by comparing the results obtained for large black holes and small black holes.

关键词： black holes thermodynamics thermal fluctuations heat capacity Gibbs free energy energy emission Rindler–Schwarzschild black hole

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Determination of uncertainties of geomechanical parameters of metamorphic rocks using petrographic analyses

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 345-364页

作者： Behzad Dastjerdy ali Saeidi Shahriyar Heidarzadeh Department of Applied Sciences University of Quebec at ChicoutimiSaguenayQCCanada SNC-Lavalin MontrealCanada

Geomechanical parameters of intact metamorphic rocks determined from laboratory testing remain highly uncertain because of the great intrinsic variability associated with the degrees of *** aim of this paper is to develop a proper methodology to analyze the uncertainties of geomechanical characteristics by focusing on three domains,*** treatment process,schistosity angle,and ***,the variabilities of the geomechanical laboratory data of Westwood Mine(Quebec,Canada)were examined statistically by applying different data treatment techniques,through which the most suitable outlier methods were selected for each parameter using multiple decision-making criteria and engineering *** indicated that some methods exhibited better performance in identifying the possible outliers,although several others were unsuccessful because of their limitation in large sample *** well-known boxplot method might not be the best outlier method for most geomechanical parameters because its calculated confidence range was not acceptable according to engineering ***,several approaches,including adjusted boxplot,2MADe,and 2SD,worked very well in the detection of true ***,the statistical tests indicate that the best-fitting probability distribution function for geomechanical intact parameters might not be the normal distribution,unlike what is assumed in most geomechanical ***,the negative effects of schistosity angle on the uniaxial compressive strength(UCS)variabilities were reduced by excluding the samples within a specific angle range where the UCS data present the highest ***,a petrographic analysis was conducted to assess the associated uncertainties such that a logical link was found between the dispersion and the variabilities of hard and soft minerals.

关键词： Intact rock parameters Natural variabilities Outlier detection methods Uncertainties Westwood mine Mineralogy

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起始联合降脂策略对心内科门诊“极高危ASCVD”患者疗效及安全性观察——真实世界的前瞻性队列研究

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中国临床药理学与治疗学 2024年第8期29卷 907-916页

作者：赵震宇李媛郭宇轩毛萧萧 MD sayed ali Sheikh 夏珂中南大学湘雅医院临床药理研究所中南大学湘雅医院心血管内科湖南长沙410008 Internal Medicine Department CardiologyCollege of MedicineJouf UniversitySakaka 72388Saudi Arabia

目的:在真实世界的前瞻性队列研究中观察心内科门诊“极高危ASCVD”患者在治疗起始阶段采用联合降脂策略的疗效与安全性。方法:连续入组2021年1月至6月在湘雅医院心内科高脂血症专病门诊就诊的“极高危ASCVD”患者,根据其实际降脂策略... 详细信息

目的:在真实世界的前瞻性队列研究中观察心内科门诊“极高危ASCVD”患者在治疗起始阶段采用联合降脂策略的疗效与安全性。方法:连续入组2021年1月至6月在湘雅医院心内科高脂血症专病门诊就诊的“极高危ASCVD”患者,根据其实际降脂策略分为三组:阿托伐他汀单药组;阿托伐他汀联合依折麦布组;阿托伐他汀联合依洛尤单抗组。主要观察终点为治疗一个月后低密度脂蛋白胆固醇(LDL-C)、脂蛋白a[Lp(a)]、非-HDL-C变化,次要终点为总胆固醇(TC)、甘油三酯(TG)、LDL-C、超敏C反应蛋白(hs-CRP)变化及安全性指标。结果:无论哪种联合方式,在“极高危ASCVD”患者降脂起始阶段联合降脂治疗的疗效均显著优于阿托伐他汀单药组:LDL-C、Log[Lp(a)]、非-HDL-C、TC的降幅更大,差异均有统计学意义(均P0.05)。以“LDL-C<1.4 mmol/L或<1.8 mmol/L”作为降脂达标的标准时,两组联合降脂治疗的LDL-C达标率均高于阿托伐他汀单药组,差异均有统计学意义(均P<0.05);阿托伐他汀联合依洛尤单抗组的LDL-C达标率高于阿托伐他汀联合依折麦布组,差异均有统计学意义(均P<0.05)。单独或联合“LDL下降超过50%”的降幅为达标标准,三组均无人能达标。治疗后三组间的肝脏转氨酶水平变化差异均无统计学意义(均P<0.05);三组间心肌酶同工酶(CK-MB)均下降,但差异无统计学意义(P<0.05)。与阿托伐他汀单药组相比,两联合降脂组治疗组的血糖均下降,差异具有统计学意义(P<0.05);阿托伐他汀联合依折麦布组的血糖比阿托伐他汀联合依洛尤单抗组的降幅更大,差异有统计学意义(P<0.05)。结论:起始联合降脂治疗1个月对心内科门诊“极高危ASCVD”患者的降脂效果及LDL-C的达标率优于阿托伐他汀单药组。以LDL-C<1.4 mmol/L或<1.8 mmol/L为降脂达标目标时,阿托伐他汀联合依洛尤单抗组治疗1个月后LDL-C达标率高于联合依折麦布组;以“LDL下降超过50%”的降幅作为降脂达标标准时,1个月内很难达标。门诊“极高危ASCVD”患者采用起始联合的降脂治疗1个月无不良反应。起始联合降脂策略可用于心内科门诊“极高危ASCVD”患者中LDL-C数值需早期达标的人群,阿托伐他汀联合依洛尤单抗可用于需在1个月内LDL-C<1.4 mmol/L或<1.8 mmol/L的人群。

关键词：起始联合降脂极高危ASCVD 真实世界前瞻性队列研究早期达标

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Identifying flow regime in the aquifer of fractured rock system in Germi Chai Basin,Iran

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Journal of Mountain Science 2024年第2期21卷 574-589页

作者： VAEZIHIR Abdorreza SEPEHRIPOUR ali TABARMAYEH Mehri Department of Earth Sciences University of TabrizTabriz ***Iran

Considering the importance of fractured rock aquifers in the hydrogeologic process,this research aimed to analyze the flow regime,internal degree of karstification,and estimate storage volume in fractured rock aquifers of the Germi Chai Basin in northwest Iran,which is attributed to its active tectonics,erosion,and the lithological *** the geological setting,the hypothesis is that this basin is characterized by a high degree of karstification and diffuse or intermediate flow regime leading to variation in discharge flow *** hydrodynamic and hadrochemical analysis was conducted on 9 well distributed springs across the basin from 2019 to *** maximum flow rate in most of the springs appeared in the early wet season despite their different levels of fluctuations on the monthly discharge time *** the spring recession curve form revealed an aquifer containing multiple micro-regimes withαrecession coefficients and a degree of karstification ranging between 0.001 to 0.06 and 0.55 to 2.61,*** findings indicated a dominant diffuse and intermediate flow system resulting from the development of a high density of fractures in this *** electrical conductivity of the spring changes inversely proportional to the change in flow discharge,indicating the reasonable hydrological response of the aquifer to rainfall *** analysis revealed that the delay time of spring discharge after rainfall events mostly varies between 10 to 30 *** total dynamic storage volume of the spring for a given period(2019-2020)was estimated to be approximately 1324 million cubic meters reflecting the long-term drainage potential and high perdurability of dynamic *** the maximum and minimum ratio revealed that the springs recharging system in Germi Chai Basin comes under the slow aquifers *** finding provides valuable insight into the hydrogeological properties of fractured rock aquifers contributing to effective w

关键词： Fractured rock aquifer Hydrodynamic and hadrochemical analysis Germi Chai Basin Recession coefficient

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An SDN-Based Algorithm for Caching,Routing,and Load Balancing in ICN

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China Communications 2024年第5期21卷 64-76页

作者： MohammadBagher Tavasoli Hossein Saidi ali Ghiasian Department of electrical and Computer Engineering Isfahan University of TechnologyIsfahanIran Department of Technology and Engineering Shahrekord UniversityShahrekordIran

One of the challenges of Informationcentric Networking(ICN)is finding the optimal location for caching content and processing users’*** this paper,we address this challenge by leveraging Software-defined Networking(SDN)for efficient ICN *** achieve this,we formulate the problem as a mixed-integer nonlinear programming(MINLP)model,incorporating caching,routing,and load balancing *** explore two distinct scenarios to tackle the ***,we solve the problem in an offline mode using the GAMS environment,assuming a stable network state to demonstrate the superior performance of the cacheenabled network compared to non-cache ***,we investigate the problem in an online mode where the network state dynamically changes over *** the computational complexity associated with MINLP,we propose the software-defined caching,routing,and load balancing(SDCRL)algorithm as an efficient and scalable *** evaluation demonstrates that the SDCRL algorithm significantly reduces computational time while maintaining results that closely resemble those achieved by GAMS.

关键词： in-network caching information-centric network power efficiency routing software-defined networking

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Big data challenge for monitoring quality in higher education institutions using business intelligence dashboards

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Journal of electronic Science and Technology 2024年第1期22卷 25-41页

作者： ali Sorour Anthony S.Atkins Faculty of Digital TechnologyInnovationand BusinessStaffordshire UniversityStoke-on-TrentST42DEUnited Kingdom

As big data becomes an apparent challenge to handle when building a business intelligence(BI)system,there is a motivation to handle this challenging issue in higher education institutions(HEIs).Monitoring quality in HEIs encompasses handling huge amounts of data coming from different *** paper reviews big data and analyses the cases from the literature regarding quality assurance(QA)in *** also outlines a framework that can address the big data challenge in HEIs to handle QA monitoring using BI dashboards and a prototype dashboard is presented in this *** dashboard was developed using a utilisation tool to monitor QA in HEIs to provide visual representations of big *** prototype dashboard enables stakeholders to monitor compliance with QA standards while addressing the big data challenge associated with the substantial volume of data managed by HEIs’QA *** paper also outlines how the developed system integrates big data from social media into the monitoring dashboard.

关键词： Big data Business intelligence(BI) Dashboards Higher education(HE) Quality assurance(QA) Social media

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Microstructural analysis of marl stabilized with municipal solid waste and nano-MgO

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3258-3269页

作者： ali Ohadian Navid Khayat Mehdi Mokhberi Department of Civil Engineering Ahvaz BranchIslamic Azad UniversityAhvazIran Department of Civil Engineering Estahban BranchIslamic Azad UniversityEstahbanIran

Municipal solid waste(MSW)is accumulating over elapsed time across the world,and it is observed in many projects associated with weak soils,such as ***,effective solutions to the environmental problem are *** techniques for stabilizing marl generally use substances such as lime and cement,which could exacerbate *** this,some new stabilizers,***-MgO,are *** are large quantities of marls and MSW in Shiraz City,*** present study aims to evaluate the feasibility of using nano-MgO as a green low-carbon binder to remove MSW from the environment and make construction projects more *** drained shear tests were conducted to evaluate the mechanical behaviors of the nano-MgO treated marl specimens at high normal *** marl specimens containing MSW percentages of 15%,25%,35%,and 45%and nano-MgO percentages of 0.25%,0.5%,0.75%,and 1%,were *** is found that the marl containing 15%and 25%MSW and 0.5%nano-MgO at 28-d curing can perform cation exchange and form new cementitious *** soils with merely MSW show good performance due to the removal of the kaolinite and the formation of ***,the soil with 25%MSW and 0.5%nano-MgO shows the same strength enhancement as the specimen with the optimal nano-MgO(0.75%)through the formation of dolomite,with a 20.59%increase in strain energy(SE).

关键词： Marl Shear strength Microstructure Nano-MgO Municipal solid waste(MSW)

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