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An IDDES study of the near-wake flow topology of a simplified heavy vehicle

Transportation Safety and Environment 2022年第2期4卷 105-122页

作者： Jie Zhang Zhanhao Guo Shuai Han siniša krajnovi′c John Sheridan Guangjun Gao Key Laboratory of Traffic Safety on Track of Ministry of Education School of Traffic&Transportation EngineeringCentral South UniversityChangsha 410075China Joint International Research Laboratory of Key Technology for Rail Traffic Safety Central South UniversityChangsha 410075China National&Local Joint Engineering Research center of Safety Technology for Rail Vehicle Central South UniversityChangsha 410075China Department of Mechanics and Maritime Sciences Chalmers University of TechnologyGothenburg 41296Sweden Department of Mechanical and Aerospace Engineering Monash UniversityClaytonVictoria 3800Australia.

The complex wake flow of a GTS(ground transportation system)model contributes to large percentage of the aerodynamic drag ***,predicting accurate wake flow will help carry out the drag reduction *** this paper,the near-wake flow topology of the GTS was studied at Re=2.7×104 to assess the capability of a hybrid RANS/LES(Reynolds-averaged Navier–Stokes/large eddy simulation)approach,known as IDDES(improved delayed detached eddy simulation).The current study also aims to understand the effects of different computational parameters,*** spatial resolution,time step,residual level,discretization scheme and turbulence model,on this asymmetrical wake flow configuration.A comparison of IDDES with previous water channel tests,wellresolved LES,partially averaged Navier–Stokes and URANS(unsteady RANS)was included to better understand the benefits of this hybrid RANS/LES *** results show that on the medium and fine grids,the IDDES produces an asymmetrical flow topology(known as flow state I)in the near-wake of the vertical midplane,as reported in previous *** recommended parameters for the time step(1×10^(–4 )s)and residual level(1×10^(–4))provide sufficient accuracy of wake predictions to show good agreement with *** the convective term of the momentum equation in IDDES,the bounded central difference discretization scheme is proposed to be adopted for ***,URANS cannot accurately capture this asymmetrical flow *** proves to be capable of predicting thewake flowfield of this simplified heavy vehicle with high *** obtained conclusions can provide references for the aerodynamic drag reduction of the GTS.

关键词： Heavy vehicle Asymmetrical wakes IDDES computational parameter

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A High Efficiency Hardware Implementation of S-Boxes Based on composite Field for Advanced Encryption Standard

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Journal of computer and communications 2024年第4期12卷 228-246页

作者： Yawen Wang sini Bin Shikai Zhu Xiaoting Hu college of computer Science & Technology Jiangsu Normal University Xuzhou China

The SubBytes (S-box) transformation is the most crucial operation in the AES algorithm, significantly impacting the implementation performance of AES chips. To design a high-performance S-box, a segmented optimization implementation of the S-box is proposed based on the composite field inverse operation in this paper. This proposed S-box implementation is modeled using Verilog language and synthesized using Design complier software under the premise of ensuring the correctness of the simulation result. The synthesis results show that, compared to several current S-box implementation schemes, the proposed implementation of the S-box significantly reduces the area overhead and critical path delay, then gets higher hardware efficiency. This provides strong support for realizing efficient and compact S-box ASIc designs.

关键词： Advanced Encryption Standard (AES) S-Box Tower Field Hardware Implementation Application Specific Integration circuit (ASIc)

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Next Generation Nutrition: Genomic and Molecular Breeding Innovations for Iron and Zinc Biofortification in Rice

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Rice science 2024年第5期31卷 526-544,I0029,I0030页

作者： Kunhikrishnan Hemalatha DHANYALAKSHMI Reshma MOHAN Sasmita BEHERA Uday chand JHA Debashis MOHARANA Ahalya BEHERA sini THOMAS Preman Rejitha SOUMYA Rameswar Prasad SAH Radha BEENA Department of Plant Physiology College of AgriculturePadannakkadKerala Agricultural UniversityKerala 671314India Department of Plant Physiology College of AgricultureVellayaniKerala Agricultural UniversityKerala 695522India crop Improvement Division India Council of Agricultural Research-National Rice Research InstituteOdisha 7530006India Department of Plant Breeding and Genetics Indian Institute of Pulse ResearchKanpur 208024India Department of Plant Physiology College of AgricultureKumarakomKerala Agricultural UniversityKerala 686563India

Global efforts to address malnutrition and hidden hunger, particularly prevalent in low- and middle-income countries, have intensified, with a focus on enhancing the nutritional content of staple crops like rice. Despite serving as a staple for over half of the world's population, rice falls short in meeting daily nutritional requirements, especially for iron(Fe) and zinc(Zn). Genetic resources, such as wild rice species and specific rice varieties, offer promising avenues for enhancing Fe and Zn content. Additionally, molecular breeding approaches have identified key genes and loci associated with Fe and Zn accumulation in rice grains. This review explores the genetic resources and molecular mechanisms underlying Fe and Zn accumulation in rice grains. The functional genomics involved in Fe uptake, transport, and distribution in rice plants have revealed key genes such as OsFRO1, OsIRT1, and OsNAS3. Similarly, genes associated with Zn uptake and translocation, including OsZIP11 and OsNRAMP1, have been identified. Transgenic approaches, leveraging transporter gene families and genome editing technologies, offer promising avenues for enhancing Fe and Zn content in rice grains. Moreover, strategies for reducing phytic acid(PA) content, a known inhibitor of mineral bioavailability, have been explored, including the identification of low-PA mutants and natural variants. The integration of genomic information, including whole-genome resequencing and pan-genome analyses, provides valuable insights into the genetic basis of micronutrient traits and facilitates targeted breeding efforts. Functional genomics studies have elucidated the molecular mechanisms underlying Fe uptake and translocation in rice. Furthermore, transgenic and genome editing techniques have shown promise in enhancing Fe and Zn content in rice grains through the manipulation of key transporter genes. Overall, the integration of multi-omics approaches holds significant promise for addressing global malnutri

关键词： biofortification grain quality iron phytic acid rice zinc

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Enhanced Sensitivity and Stability in Gelatin-Based Fricke gel Dosimeters:Impact of Benzoic Acid on Low-Dose Radiation Measurements

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Instrumentation 2024年 23-29页

作者： Seyed Amir Saeedi-sini Sedigheh Sina Mohammad Hossein Sadeghi Ebrahim Farajzadeh Nuclear Engineering Department School of Mechanical EngineeringShiraz University Radiation Research center School of Mechanical EngineeringShiraz University Secondary Standard Dosimetry Laboratory(SSDL) Pars Isotope Co.

Fricke gel dosimetry is a critical technique for accurate radiation dose measurement,leveraging the radiation-induced oxidation of ferrous to ferric ions within a hydrogel *** study aimed to advance the field by preparing and evaluating seventy-one Fricke gel dosimeter (FGD) samples with varying chemical compositions,focusing on the incorporation of benzoic *** gelatin-based samples demonstrated superior sensitivity,particularly for low-dose *** findings indicated that the sample without benzoic acid exhibited a 1.75 times higher sensitivity compared to the sample containing benzoic acid,with lower limits of detection at 0.04 Gy and 0.1 Gy,*** tests revealed temperature-dependent responses,with better performance observed under refrigerated *** was confirmed through consistent calibration curves across multiple ***,the dosimeters'responses varied with different radiation types,underscoring the need for specific *** study concludes that while benzoic acid slightly reduces sensitivity,it provides consistent responses across various radiation energies,suggesting its potential as a beneficial additive in diverse clinical *** research contributes to the ongoing optimization of FGDs for precise radiation dose assessment.

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Mobility of Major and Trace Elements during the Bauxitization Processes in Ngaoundal Area (Adamawa cameroon): Implication on Mining Perspectives

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Open Journal of Geology 2024年第1期14卷 81-100页

作者： André sini Harouna Boukari Ondoa Augustin Désiré Balla Djetenbe Beral Salomon Wangmené Awé Simon Djakba Basga Jean Pierre Nguetnkam Department of Mining Engineering School of Geology and Mining Engineering University of Ngaoundere Ngaoundere Cameroon Department of Mining Engineering and Environment School of Mining Industry and Geology University of Abdou-Moumouni Niamey Niger Department of Earth Sciences Faculty of Science University of Ngaoundere Ngaoundere Cameroon Department of Mining Engineering Saint Jerome Polytechnic Saint Jerome Catholic University Institute of Douala Douala Cameroon Institute of Agricultural Research for Development (IRAD) Garoua Cameroon

This study was focused to assess major and trace elements in bauxitic duricrusts from Ngaoundal and its surroundings in order to establish their mining interest. To this end, fieldworks, mineralogical and geochemical analyses were carried out. Four facies of duricrust were identified and characterized from the summit to the top of the slope of the Ngaoundal mountain: scoriaceous, pisolitic, nodular and massive. Mineralogical and geochemical analyses performed on 16 samples, revealed a significant concentration of Al2O3 mainly in the scoriaceous facies (over 45% in grade), moderate in Fe2O3 (averaging 23.69%) and SiO2 (averaging 21.7%). Trace elements were generally low, excluding cr (421 ppm on average), Zr (327 ppm on average and V (213 ppm on average). In addition, the limited quantities of alkalis (Na2O, K2O) and alkaline earths metals (MgO, caO) coupled with the very high values of chemical Index of Alteration (cIA) and Mineralogical Index of Alteration (MIA), (more than 99%) attest to the intense weathering of the studied materials. Allitization and monosiallitization constituted the crystallochemical phenomena that have led to the development of bauxitic minerals. More than 90% of gibbsite in scoriaceous facies, 52.21% - 76.01% of kaolinite in pisolitic facies and more than 40% of hematite in nodular facies were quantified. The relationships between the constitutive components indicated their interdependency during the bauxitization phenomenon. The mineralogical and geochemical properties highlighted the mining interest of the studied duricrusts to be valorized.

关键词： Duricrust Bauxitization Phenomenon Mineralogical and Geochemical characterization Major and Trace Elements Mining Potential

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创业青年组织化发展研究:镜像、动力与路径——基于现代化与组织化关系视角

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青年发展论坛 2024年第3期34卷 80-89页

作者：倪斯铌广东省团校(广东青年政治学院)粤港澳大湾区青年学院(青年创新创业学院)

中国式现代化进程中“现代化”与“组织化”深刻交织,共同形塑我国现代社会形态及青年组织化发展路径变迁。在现代化社会关系转型以及多重社会风险叠加的时代背景下,原子化创业青年呈现组织化发展趋势。基于粤港澳大湾区内的案例研究和... 详细信息

中国式现代化进程中“现代化”与“组织化”深刻交织,共同形塑我国现代社会形态及青年组织化发展路径变迁。在现代化社会关系转型以及多重社会风险叠加的时代背景下,原子化创业青年呈现组织化发展趋势。基于粤港澳大湾区内的案例研究和实证调查,本文描绘“组织化交流、学习、监督、参与”的群像特征,构建“信任增进—规范形成—规范遵守—网络发展”的组织化动力机制。立足现代化与组织化的互惠规范及互构共变,本研究建议从“组织自治、结构本位、社会动员、公共性回归”四个层面引导创业青年组织化发展。

关键词：创业青年组织化现代化再组织化粤港澳大湾区

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Light sheet microscope scanning of biointegrated microlasers for localized refractive index sensing

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Photonics Research 2024年第8期12卷 1673-1680页

作者： ROSS c.cOWIE MARcEL ScHUBERT SUPA School of Physics and AstronomyUniversity of St AndrewsSt AndrewsUK Humboldt centre for Nano and Biophotonics Department of ChemistryUniversity of CologneCologneGermany

Whispering gallery mode(WGM)microlasers are highly sensitive to localized refractive index changes allowing to link their emission spectrum to various chemical,mechanical,or physical *** recently found applications in biological studies within single cells,in three-dimensional samples such as multicellular spheroids,or in ***,detailed studies of biological samples also need to account for the structural heterogeneity of tissues and live animals,therefore requiring a combination of high-resolution microscopy and laser ***,we design and construct a light sheet fluorescence microscope with a coupled spectrometer for use in microlaser studies for combined high-resolution,high-speed imaging and WGM spectral *** light sheet illumination profile and the decoupled geometry of excitation and emission hereby directly affect the lasing and sensing properties,mainly through geometric constraints and by light coupling *** demonstrate the basic working principle of microlaser spectroscopy under light sheet excitation and measure the absolute refractive index within agarose and in zebrafish tail muscle *** further analyze the light coupling conditions that lead to the occurrence of two separate oscillation *** so-called cross modes can be scanned around the entire microlaser surface,which allows to estimate a surface-averaged refractive index profile of the microlaser environment.

关键词： refractive index excitation

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Important step towards an understanding of the exotic Z_(c)(3900)

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Science china(Physics,Mechanics & Astronomy) 2024年第9期67卷 199-200页

作者： c.Hanhart Institute for Advanced Simulation Forschungszentrum JulichJilich D-52425Germany

The Standard Model of particle physics,which contains the field theories for the electro-weak interaction(QED)and the strong interaction(QcD),is an extremely successful theory describing a huge variety of phenomena at... 详细信息

关键词： interaction atomic describing

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催产素与卡孕栓联合使用对顺产后产后出血的临床观察

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哈尔滨医药 2024年第3期44卷 23-25页

作者：张丝妮广州市中西医结合医院广东广州510800

目的探讨分析催产素与卡孕栓联合使用对顺产后产后出血的临床效果。方法选取120例顺产后产后出血产妇分为对照1组、对照2组、实验组,对照1组仅给予催产素治疗,对照2组仅给予卡孕栓治疗,实验组给予催产素与卡孕栓联合治疗,比较三组产妇... 详细信息

目的探讨分析催产素与卡孕栓联合使用对顺产后产后出血的临床效果。方法选取120例顺产后产后出血产妇分为对照1组、对照2组、实验组,对照1组仅给予催产素治疗,对照2组仅给予卡孕栓治疗,实验组给予催产素与卡孕栓联合治疗,比较三组产妇出血量、止血时间、止血效果、凝血因子水平、不良反应。结果三组产妇产后出血量及止血时间差异有统计学意义(P0.05),治疗后三组产妇凝血因子Ⅶ、FIB、PTT、PT及PLT水平均显著改善,且治疗后实验组产妇凝血因子Ⅶ、FIB、PTT、PT及PLT水平较对照1组、对照2组产妇改善更显著(P0.05)。结论催产素与卡孕栓联合治疗产妇顺产后产后出血起到协同机制的作用,相互补充效果显著,可改善产妇凝血功能,缩短止血时间,安全性好,值得推广。

关键词：催产素卡孕栓顺产产后出血

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商务英语视听说教学中的认知策略研究及应用

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现代英语 2024年第4期 67-69页

作者：仇思妮湖南涉外经济学院湖南长沙410205

随着经济全球化的深入发展,商务英语人才培养日益受到重视。视听说教学是提高学生商务英语交际能力的重要途径。文章基于认知策略理论,探讨了认知策略在商务英语视听说教学中的应用。通过分析认知策略在商务英语听力和口语教学中的作用... 详细信息

随着经济全球化的深入发展,商务英语人才培养日益受到重视。视听说教学是提高学生商务英语交际能力的重要途径。文章基于认知策略理论,探讨了认知策略在商务英语视听说教学中的应用。通过分析认知策略在商务英语听力和口语教学中的作用,提出了在听前、听中、听后以及口语教学各阶段应用认知策略的具体方法。文章就加强认知策略教学、创设真实语境、实行多元评估和加强教师培训等方面提出建议,以期为提高商务英语视听说教学质量提供参考。

关键词：商务英语视听说教学认知策略教学策略

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