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Survey of robotics in Education, Taxonomy, Applications, and Platforms during COVID-19

Computers, materials & Continua 2021年第4期67卷 687-707页

作者： Hussain A.Younis A.S.A.mohamed r.Jamaludin m.N.Ab Wahab College of Education for Women University of Basrah BasrahIraq School of Computer Sciences Universiti Sains MalaysiaMinden11800PenangMalaysia Centre For Instructional Technology&multimedia Universiti Sains MalaysiaMinden11800PenangMalaysia

The coronavirus disease 2019(COVID-19)is characterized as a disease caused by a novel coronavirus known as severe acute respiratory coronavirus syndrome 2(SArS-CoV-2;form.r.y known as 2019-nCoV).In December 2019,COVID-19 began to appear in a few *** the beginning of 2020,it had spread to most countries across the *** is when education challenges began to *** COVID-19 crisis led to the closure of thousands of schools and universities all over the *** a situation requires reliance on e-learning and robotics education for students to continue their studies to avoid the mingling between people and *** relation to this alternative learning solution,the present study was conducted.A systematic literature review on educational robotics(er)keywords between 2015–2020 was carried out for the purpose to review a total of 2253 articles from the selected sources;Scopus(452),Taylor&Francis(311),Science Direct(427),IEEE Xplore(221),and Web of Science(842).This review procedure was labelled as Taxonomy *** ltering Taxonomy 1,it was found that 98 scientic articles formed the so-called Taxonomy II that was categorized into six categories:(i)robotics concepts,(ii)Device,(iii)robotic applications,(iv)manufacturing robots,(v)robotics analysis,and(vi)Education/*** this study,only 35 articles in this specic eld were selected,of which were then assigned into three categories:(i)Application,(ii)Platform,and(iii)*** results show that the application category carries 17.4%,platform 20%,and education 22.85%.This study serves as the application platform to help students,academics,and researchers.

关键词： COVID-19 educational educational robotics taxonomy application platform

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Features of Tight Sandstone reservoir and Origin of Tightness:An Example from Chang-7 member,Triassic Yanchang Formation in Chenghao Area,Ordos Basin

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Acta Geologica Sinica(English Edition) 2015年第A01期89卷 25-26页

作者： er Chuang ZHAO Jingzhou BAI Yubin WU Weitao ZHANG Jie WEI Zhikun School of Earth Science and Engineering Xi'an Shiyou University Xi'an Shaanxi 710065 Shaanxi Key Lab of Petroleum Accumulation Geology Xi'an Shiyou University Xi'an Shaanxi 710065

1 Introduction Permeability of member-6, member-7, and member-8, Triassic Yangchang Formation in Ordos Basin is lower than 1？0-3μm2, so sandstone in those formations are typical tight reservoir（ Zhao et al., 2012a,... 详细信息

关键词： SANDSTONE -- research rESerVOIrS BASINS (Geology) CONFOCAL microscopy mICrOPOrES CHINA

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一种改进的衰落分集信道量化FSmC模型及其性能分析

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电子学报 2006年第12期34卷 2227-2231页

作者：高凯张尔扬国防科技大学电子科学与工程学院湖南长沙410073

针对无线快衰落信道,本文提出一种改进的一阶FSmC量化模型,并提出一种通过分析基带差错序列游程分布特性的新方法,来验证m.r.ov模型的性能.文中给出FSmC量化模型参数提取方法,并分别通过对采用选择性合并、等增益合并、最大比合并以及... 详细信息

针对无线快衰落信道,本文提出一种改进的一阶FSmC量化模型,并提出一种通过分析基带差错序列游程分布特性的新方法,来验证m.r.ov模型的性能.文中给出FSmC量化模型参数提取方法,并分别通过对采用选择性合并、等增益合并、最大比合并以及不采取分集合并的Nakagami分布衰落信道的仿真,证实了改进的量化FSmC模型的准确性.

关键词：有限态m.r.ov信道 Nakagami-m分布信道模型

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Investigation on Electron Beam Welded Copper to AISI 316 Stainless Steel Joints

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厦门大学学报（自然科学版） 2002年第S1期41卷 90-91页

作者： El-Hebeary m.r.megahed H Elziady N Faculty of Engineering Cairo UniversityFaculty of Engineering Cairo UniversityFaculty of Engineering Cairo University Giza EgyptGiza EgyptGiza Egypt

Joints of copper and stainless steels are used in a er ospace applications. Production of these joints by fusion welding faces many dif ficulties. This may be due to the differences in their physical, metallurgical a nd mechanical properties. Electron Beam Welding (EBW) process has been found to be especially well suited in this area. Selection of the appropriate welding par ameters needs thorough investigations. These parameters include: preheat tempera ture (℃), welding current (I w), focusing current (I F), welding spee d (V), height between the gun and workpiece surface (H), scan width (S w) and shift distance (S). The present work aims firstly, setting the pr oper welding conditions to get sound joint between comm.r.ially pure copper (C10 200) and AISI 316 stainless steel plates 8 mm thickness. Secondly, investigate t he effect of Electron Beam (EB) shift, single-sided and double-sided welds on the mechanical, metallurgical and chemical properties of the weld bead. Due to t he high difference in thermal conductivity between copper and stainless steel, E lectron Beam (EB) was shifted towards copper with different values. These values were ranged from 0.3 to 0.9 mm in welding without preheating of copper plate an d from 0.1 to 0.4 mm with preheating. Number of joints were welded using variabl e EBW parameters in view to obtain the sound weld bead. These parameters are as follows: gradual reduction I w=51 to 49 mA, I F=845 mA, V=8 mm/sec , H=130 mm, S w=500 μm and S=0.4 mm. The investigation has shown t hat, the copper (C10200) plate must be preheated to get sound welded joint with AISI 316 stainless steel using the EBW process. The tensile fracture in all wel ded samples occurred in copper plate away from the weld bead. This reflects that the weld bead tensile strength is greater than the copper strength. The EB shif t has slight effect on hardness distribution through weld bead. The hardness val ue (H v) reduces in gradual manner from stainless steel hardness to

关键词： AISI Investigation on Electron Beam Welded Copper to AISI 316 Stainless Steel Joints

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ranking environmental and edaphic attributes driving soil microbial community structure and activity with special attention to spatial and temporal scales

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mLife 2024年第1期3卷 21-41页

作者： Vadakattu V.S.r.Gupta James m.Tiedje CSIrO Agriculture&Food UrrbraeSouth AustraliaAustralia Centre for microbial Ecology Michigan State UniversityEast LansingMichiganUSA

The incredibly complex soil microbial communities at small scales make their analysis and identification of reasons for the observed structures *** community structure is mainly a result of the inoculum(dispersal),the selective advantages of those organisms under the habitat-based environmental attributes,and the ability of those colonizers to sustain themselves over *** soil is protective,and its microbial inhabitants have long adapted to varied soil conditions,significant portions of the soil microbial community structure are likely ***,a substantial portion of the community will not correlate to often measured soil *** suggest that the drivers be ranked on the basis of their importance to the fundamental needs of the microbes:(i)those that supply energy,i.e.,organic carbon and electron acceptors;(i)environmental effectors or stressors,i.e.,pH,salt,drought,and toxic chemicals;(ii)macro-organism associations,i.e.,plants and their seasonality,animals and their fecal matter,and soil fauna;and(iv)nutrients,in order,N,P,and probably of lesser importance,other micronutrients,and *** relevance of drivers also varies with spatial and time scales,for example,aggregate to field to regional,and persistent to dynamic populations to transcripts,and with the extent of phylogenetic difference,hence phenotypic differences in organismal *** present a summ.r. matrix to provide guidance on which drivers are important for particular studies,with special emphasis on a wide range of spatial and temporal scales,and illustrate this with genomic and population(rrNA gene)data from selected studies.

关键词： abundance community structure diversity functional microbiome microorganisms

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recombinant scorpion insectotoxin AaIT kills specifically insect cells but not human cellss

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Cell research 2002年第2期12卷 143-150页

作者： SHENG JIAN JI, FENG LIU, er Qiu LI, Yu XIAN ZHUThe National Laboratory of Protein Engineering and Plant Genetic Engineering, College of Life Sciences, Peking University, Beijing 100871, China 1The National Laboratory of Protein Engineering and Plant Genetic Engineering College of Life Sciences Peking University Beijing 100871 China 1The National Laboratory of Protein Engineering and Plant Genetic Engineering College of Life Sciences Peking University Beijing 100871 China 1The National Laboratory of Protein Engineering and Plant Genetic Engineering College of Life Sciences Peking University Beijing 100871 China 1The National Laboratory of Protein Engineering and Plant Genetic Engineering College of Life Sciences Peking University Beijing 100871 China

The nucleotide sequence deduced from the amino acid sequence of the scorpion insectotoxin AaIT was chemically synthesized and was expressed in Escherichia coli. The authenticity of this in vitro expressed peptide was confirmed by N-terminal peptide sequencing. Two groups of bioassays, artificial diet incorporation assay and contact insecticidal effect assay, were carried out separately to verify the toxicity of this recombinant toxin. At the end of a 24 h experimental period, m.r. than 60% of the testing diamondback moth （Plutella xylostella） larvae were killed in both groups with LC50 value of 18.4 μm and 0.70 μm.r.spectively. Cytotoxicity assay using cultured Sf9 insect cells and mCF-7 human cells demonstrated that the toxin AaIT had specific toxicity against insect cells but not human cells. Only 0.13 μm.r.combinant toxin was needed to kill 50% of cultured insect cells while as much as 1.3 μm toxin had absolutely no effect on human cells. Insect cells produced obvious intrusions from their plasma

关键词： Scorpion toxin AaIT prokaryotic expression cytotoxicity.

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metathesis synthesis, characterization, spectral and photoactivity studies of Ln_(2/3)moO_4(Ln=La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, er and Y)

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Journal of rare Earths 2015年第8期33卷 837-845页

作者： radha Velchuri Suresh Palla G.ravi Naveen Kum.r.Veldurthi J.r.reddy m.Vithal Department of Chemistry Osmania University

rare earth ortho-oxomolybdates of composition Ln2/amoO4 （Ln=La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, er and Y） were prepared by metathesis reaction. All these materials were characterized by powder X-ray diffraction, Fourier transform-infrared spectroscopy （FT-Ir） and UV-Vis diffuse reflectance spectra. The rietveld analysis of all the samples was carried out to obtain the unit cell parameters and reliability factors. All the materials were crystallized in tetragonal lattice with I41/a space group. The infrared spectra of all the samples were characterized by bands due to moO42 units. The bandgap energies of all the samples were obtained from UV-Vis DrS spectra. The luminescence spectra of Ln2/3moO4 （Ln=Pr, Eu and Dy） showed characteristic transitions of the rare earth ions. The visible light photocatalytic activity of all the samples was studied against degradation of methylene blue.

关键词： metathesis X-ray diffxaction Ir spectroscopy UV-Vis spectroscopy photodegradation rare earths

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Anatomic isolated caudate lobectomy: Is it possible to establish a standard surgical flow?

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World Journal of Gastroenterology 2017年第41期23卷 7433-7439页

作者： Yun Jin Liang Wang Yuan-Quan Yu Dong-er Zhou Da-ren Liu Jun-Jie Yang Shu-You Peng Jiang-Tao Li Department of General Surgery The Second Affiliated Hospital College of MedicineZhejiang University Department of General Surgery Xinchang People’s Hospital

AIm To establish the surgical flow for anatomic isolated caudate lobe resection. mETHODS The study was approved by the ethics committee of the Second Affiliated Hospital Zhejiang University School of medicine(SAHZU). From April 2004 to July 2014, 20 patients were enrolled who underwent anatomic isolated caudate lobectomy at SAHZU. Clinical and postoperative pathological data were analyzed. rESULTS Of the total 20 cases, 4 received isolated complete caudate lobectomy(20%) and 16 received isolated partial caudate lobectomy(80%). There were 4 caseswith the left approach(4/20, 20%), 6 cases with the right approach(6/20, 30%), 7 cases with the bilateral combined approach(7/20, 35%), 3 cases with the anterior approach(3/20, 15%), and the hanging maneuver was also combined in 2 cases. The median tum.r.size was 5.5 cm(2-12 cm). The median intraoperative blood loss was 600 m L(200-5700 m L). The median intra-operative blood transfusion volume was 250 m L(0-2400 m L). The median operation time was 255 min(110-510 min). The median post-operative hospital stay was 14 d(7-30 d). The 1-and 3-year survival rates for malignant tum.r.were 88.9% and 49.4%, respectively. CONCLUSION Caudate lobectomy was a challenging procedure. It was demonstrated that anatomic isolated caudate lobectomy can be done safely and effectively.

关键词： Caudate lobectomy Surgical flow Anatomic liver resection

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machine Learning models of Plastic Flow Based on representation Theory

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Computer modeling in Engineering & Sciences 2018年第12期117卷 309-342页

作者： r.E.Jones J.A.Templeton C.m.Sanders J.T.Ostien Sandia National Laboratories P.O.Box 969LivermoreCA 94551USA.

We use machine learning(mL)to infer stress and plastic flow rules using data from.r.presentative polycrystalline *** particular,we use so-called deep(multilayer)neural networks(NN)to represent the two response *** mL process does not choose appropriate inputs or outputs,rather it is trained on selected inputs and ***,its discrimination of features is crucially connected to the chosen inputoutput ***,we draw upon classical constitutive modeling to select inputs and enforce well-accepted symmetries and other *** the context of the results of num.r.us simulations,we discuss the design,stability and accuracy of constitutive NNs trained on typical experimental *** these developments,we enable rapid model building in real-time with experiments,and guide data collection and feature discovery.

关键词： machine learning constitutive modeling plasticity invariance.

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Potential preservative mechanisms of cardiac rehabilitation pathways on endothelial function in coronary heart disease

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Science China Life Sciences 2024年

作者： Wen-Tao Sun Jian-Yong Du Jia Wang Yi-Long Wang er-Dan Dong research Center for Cardiopulmonary rehabilitation University of Health and Rehabilitation Sciences Qingdao Hospital (Qingdao Municipal Hospital)School of Health and Life SciencesUniversity of Health and Rehabilitation Sciences Department of Cardiology and Institute of Vascular medicine Peking University Third HospitalThe Institute of Cardiovascular SciencesPeking UniversityState Key Laboratory of Vascular Homeostasis and RemodelingPeking University

Cardiac rehabilitation, a com.r.hensive exercise-based lifestyle and medical management, is effective in decreasing m.r.idity and im.r.ving life quality in patients with coronary heart disease. Endothelial function, an irreplaceable indicator in coronary heart disease progression, is measured by various methods in traditional cardiac rehabilitation pathways, including medicinal treatment, aerobic training, and smoking cessation. Nevertheless, studies on the effect of some em.r.ing cardiac rehabilitation programs on endothelial function are limited. This article briefly reviewed the endothelium-beneficial effects of different cardiac rehabilitation pathways, including exercise training, lifestyle modification and psychological intervention in patients with coronary heart disease, and related experimental models, and summ.r.zed both uncovered and potential cellular and molecular mechanisms of the beneficial roles of various cardiac rehabilitation pathways on endothelial function. In exercise training and some lifestyle interventions, the enhanced bioavailability of nitric oxide, increased circulating endothelial progenitor cells(EPCs), and decreased oxidative stress are major contributors to preventing endothelial dysfunction in coronary heart disease. m.r.over, the preservation of endothelial-dependent hyperpolarizing factors and inflammatory suppression play roles. On the one hand, to develop m.r. endothelium-protective rehabilitation methods in coronary heart disease, adequately designed and sized randomized multicenter clinical trials should be advanced using standardized cardiac rehabilitation programs and existing assessment methods. On the other hand, additional studies using suitable experimental models are warranted to elucidate the relationship between some new interventions and endothelial protection in both macro-and microvasculature.

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