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studies of two lanthanide coordination polymers built up from dinuclear units

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Journal of Rare Earths 2013年第1期31卷 85-93页

作者： B.Benmerad K.Aliouane N.Rahahlia A.Guehria-Ladoudi s.Dahaoui C.Lecomte Laboratory of Crystallography and Thermodynamic Department of Chemistry Faculty of ScienceUniversity A. MIRABejaa CRM2 UMR-CNRS 7036Institut Jean BarriolUniversity Nancy I

The two three-dimensional oxo-bfidged lanthanides {[Ln2（C4H2O4）3（H20）4]· 3H2O}3, with Ln=Ho3＋（1）; Gd3＋（2）, are isomorphous. They have layer-type structures built up from non-centrosymrnetric dinuclear unit Ln2O12（H2O）4, beside three lattice H20 molecules stabilizing the 3D open-frmnework. The building entities are linked through one classical syn-anti g2-carboxylato-K1O：K^1O＇ bridge. Within the bi-polyhedra, two double μ2-O＇; K2O,O＇ bridges and a syn-syn classical one, support the magnetic measurements carried out on holmium compound indicating relatively weak anti-ferromagnetic interactions. The compari- son with magnetic studies on the almost similar reported Gd（III） compound, suggested that concomitant antiferromagnetic and ferro- magnetic properties could not be excluded. The two distinct thermal behaviors evidenced the higher metal-water bond strength with the smaller cation, and revealed the great supramolecular effects generated by hydrogen-bonding patterns.

关键词： lanthanide organic frameworks crystal structure thermal behavior magnetic interactions rare earths

Coercivity kinetics upon step annealing of sintered sm(Co0.88-xFexCu0.09Zr0.03)7 magnets

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Journal of Rare Earths 2019年第10期37卷 1059-1065页

作者： A.G.Popov O.A.Golovnia A.V.Protasov V.s.Gaviko D.A.Kolodkin R.Gopalan M.N.Miheev Institute of Metal Physics of Ural Branch of Russian Academy of sciences Str.S.Kovalevskoy18Ekaterinburg620990Russia Institute of Natural sciences and Mathematics Ural Federal Universitypr.MiraEkaterinburg19620002Russia International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI) IITM Research ParkChennai 600113India

Behavior of the coercivity of the high-temperature sm(Co0.88-xFexCu0.09Zr0.03)7 magnets depending on the temperature and time of annealing with the temperature decreasing stepwise from 700 to 400℃ was *** is shown that the growth rate of coercivity abruptly increases at the initial stage of annealing in the vicinity of the Curie temperature of the smCo5 *** origin of the effect is the counter diffusion of Cu and Co atoms through dislocation tubes,which form because of enhanced stresses and a partial breakage of coherent coupling at the interface of the sm2 Co17 and smCo5 *** enrichment of the smCo5 phase in Cu close to the interface with sm2 Co17 leads to relaxation of stresses and increases in the gradient of the magnetic domain-wall energy and coercivity.

关键词： sm-Co-Fe-Cu-Zr Permanent magnet sm2Co17 smCo5 Coercivity kinetics

Plausible explanation for the third COVID-19 wave in India and its implications

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Infectious Disease Modelling 2023年第1期8卷 183-191页

作者： s.Triambak D.P.Mahapatra N.Barik A.Chutjian Department of Physics and Astronomy University of the Western CapeP/B X17Bellville7535South Africa Department of Physics Utkal UniversityVani ViharBhubaneshwar751004India Armenian Engineers and scientists of America 326 Mira Loma Ave.GlendaleCA91204USA sr.Research scientist&Group supervisor(Retd.) Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaCA 91109USA

Recently some of us used a random-walk Monte Carlo simulation approach to study the spread of *** calculations were reasonably successful in describing secondary and tertiary waves of infection,in countries such as the UsA,India,south Africa and ***,they failed to predict the observed third wave for *** this work we present a more complete set of simulations for India,that take into consideration two aspects that were not incorporated *** include the stochastic movement of an erstwhile protected fraction of the population,and the reinfection of some recovered individuals because of their exposure to a new variant of the sARs-CoV-2 *** extended simulations now show the third COVID-19 wave for India that was missing in the earlier *** also suggest an additional fourth wave,which was indeed observed during approximately the same time period as the model prediction.

关键词： COVID-19 Random walk Monte Carlo simulations Epidemic waves

Battery Train Fire Risk on a steel Warehouse structure

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Journal of Architectural Environment & structural Engineering Research 2021年第3期4卷 9-19页

作者： Jasmine mira Nicole Braxtan shen-En Chen Tiefu Zhao Lynn Harris Dave Cook Department of Civil and Environmental Engineering University of North Carolina at CharlotteCharlotteNC 28223USA Department of Electrical and Computer Engineering University of North Carolina at CharlotteCharlotteNC 28223USA Deutsche Bahn Engineering RaleighNC 27601USA Rail Propulsion systems FullertonCA 92831USA

Lithium ion battery fire hazard has been well-documented in a variety of ***,battery train technology has been introduced as a clean energy concept for *** the case of heavy locomotives such as trains,the massive collection of battery stacks required to meet energy demands may pose a significant *** objective of this paper is to review the risk evaluation processes for train fires and investigate the propagation of lithium ion battery fire to a neighboring steel warehouse structure at a rail repair shop through a case *** methodology of the analyses conducted include a Monte Carlo-based dynamic modeling of fire propagation potentials,an expert-based fire impact analysis,and a finite element(FE)nonlinear fire analysis on the structural *** case study is presented as a demonstration of a holistic fire risk analysis for the lithium ion battery fire and results indicate that significant battery fire mitigations strategies should be considered.

关键词： Lithium ion battery Train fire Propagation structural safety

synthesis of spherical Y_(2)O_(3):Er emitting particles with variable radial composition by controlled double-jet precipitation of layered precursors

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Particuology 2023年第3期74卷 92-102页

作者： Danil K.Aleshin Maxim A.Mashkovtsev Anastasiya s.Kosykh Yulia A.Kuznetsova Anatoly F.Zatsepin Vladimir N.Rychkov Institute of Physics and Technology Ural Federal University19 Mira Str.620002YekaterinburgRussia

spherical(Y_(0.98)Er_(0.02))_(2)(OH)_(5)(NO_(3))·xH_(2)O particles were synthesized by controlled double-jet precipitation,with a“core”of pure layered yttrium hydroxide nitrate,and a“shell”of co-precipitated yttrium-erbium layered hydroxide *** an increase in precipitation pH from 7 to 9.5,the size of layered“building units”decreases and the architecture of their assemblies changes from flower-like through network-like spherical to irregular *** there,spherical particles gradually increase their diameter due to the continuous uniform growth of curved layered sheets on their *** was established that such growth behavior and network-like architecture of spherical particles was retained even when yttrium was replaced by erbium ions in the layered host lattice during the formation of an Er-enriched“shell”.Analysis of sEM,EDs,XPs,photoluminescence spectra and concentration quenching effects of heat-treated Y_(2)O_(3):Er(2 at.%)particles indicate that the radial distribution of erbium in particles is most controllable in a narrow pH range of co-precipitation of layered precursors(pH8).Вy widely varying the elemental composition of“building units”during co-precipitation,one can simultaneously finely control the composition of layered hydroxides in the radial direction of the spherical particles and grow multicomponent“multi-shell”powders with desired properties.

关键词： Layered hydroxides Erbium Controlled precipitation Emitting particles Photoluminescence Concentration quenching

Peculiarities of the rheological behavior and structure formation of aluminum under deformation at near-solidus temperatures

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International Journal of Minerals,Metallurgy and Materials 2016年第5期23卷 563-571页

作者： A. s. smirnov A. V. Konovalov G. A. Belozerov V. P. shveikin E. O. smirnova Institute of Engineering science Russian Academy of Science (Ural Branch) 34 Komsomolskaya Street Ekaterinburg 620049 Russia Ural Federal University 19 Mira Street Ekaterinburg 620002 Russia

This paper deals with a peculiar rheological behavior of aluminum at near-solidus temperatures. It has been experimentally estab- lished that there is an inverse strain rate dependence of strain resistance at temperatures ranging between 560 and 640℃ and strain rates ranging from 0.06 to 1.2 s-1. Electron backscatter diffraction analysis has shown that at temperatures ranging between 540 and 640℃ and strain rates ranging from 0.06 to 0.1 s-1, the main process of softening is dynamic polygonization, resulting in in situ recrystallization. At higher strain rates, ranging between 0.8 and 1.2 s-1, and temperatures ranging between 560 and 640℃, the recovery is dynamic. This unusual behavior of the mechanism of softening and the presence of the inverse strain rate dependence of strain resistance can be explained by blocking the motion of free dislocations by foreign atoms, which occurs at strain rates ranging between 0.06 and 0.1 s-1 This process results in dislocation pile-up, thereby causing in sire recrystallization. At strain rates exceeding 0.16 s-1, there is no intensive blocking of dislocations, leading to a direct strain rate dependence of strain resistance.

关键词： aluminum rheological behavior formation near-solidus temperature

Magnetic properties of melt-spun ribbons(sm1-xZrx)(Fe0.92Ti0.08)10 with ThMn12 structure and their hydrides

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Journal of Rare Earths 2019年第10期37卷 1066-1071页

作者： A.G.Popov A.V.Protasov V.s.Gaviko D.A.Kolodkin P.B.Terentev E.G.Gerasimov Tianli Zhang Chengbao Jiang M.N.Miheev Institute of Metal Physics of Ural Branch of Russian Academy of sciences Str.S.Kovalevskoy18 Ekaterinburg620990Russia Institute of Natural sciences and Mathematics Ural Federal Universitypr.Mira19 Ekaterinburg620002Russia school of Materials science and Engineering Beihang UniversityBeijing 100191China

The structure and magnetic hysteresis properties of the cast sm1-xZrx(Fe0.92Ti0.08)10(x = 0-0.3)alloys and melt-spun ribbons prepared from them were *** the cast alloy with x>0.2, a considerable amount of the eutectic phase is found in the sEM *** of the temperature dependences of the magnetic susceptibility and XRD patterns allows amorphous state in the as-spun ribbons with x>0.2 to be *** specific magnetization measured in a field of 17 kOe and remanence decrease with increasing annealing temperature from 800 to 900 ℃ and weakly depend on Zr *** maximal value of coercivity Hc = 4.7 kOe is obtained on the ribbons with x = 0.2 after annealing at 850℃ for 10 *** additional hydrogenation of the ribbons,both the coercivity and remanence increase by 54% and 7%,respectively.

关键词： sm-Zr-Fe-Ti ThMn12 Melt-spun ribbons Hydrogenation Magnetic properties

The impact on alpha emission rates of varying distances between a CR-39 detector and alpha-emitting bone samples

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Radiation Detection Technology and Methods 2021年第4期5卷 618-626页

作者： Nada Farhan Kadhim Yasser Ayad Kadhim Rasha s.Ahmed Ali A.Ridha Mostafa Y.A.Mostafa Department of Physics College of ScienceMustansiriyah UniversityBaghdadIraq Department of Physiology College of MedicineAl-Nahrain UniversityP.O.Box 70010AlkadhimiyaBaghdadIraq Physics Unit Science DepartmentRustaq College of EducationUniversity of Technology and Applied SciencesMuscatSultanate of Oman Physics Department Faculty of ScienceMinia UniversityEl-Minia 61519Egypt Ural Federal University Mira Street 19YekaterinburgRussia620002

Background Changing the distance between a sample and an exposed solid-state nuclear track detector affects the number of alpha tracks recorded by the *** concept had been used to distinguish high-energy alpha particles by computing the alpha emission rate at two distances(0 and 2 cm)from animal bone *** and methods Two Cr-39 detectors were placed in a container with bone ash inside to measure the alpha emission rate when the detectors were in contact with the ash and hung at a distance of 2 cm from the *** The alpha emission rate was found to be 62.7×10^(−4) Bq cm^(−2) when the detector was in contact with the sample(a small exposure area)and 324.4×10^(−4) Bq cm^(−2) when the sample was placed 2 cm away(a larger exposure area).A mathematical equalization of the exposure areas was conducted(the area of the detector exposed to the alpha emitter sample at a distance of 2 cm was equalized to the area exposed when in contact with the sample).After equalization,a reduction in the average value of the alpha emission rate from 324.4×10^(−4) to 17.4×10^(−4) Bq cm^(−2) was *** The increase in distance between the sample and the detector allowed only high-energy alpha particles with a range greater than the traveled distance to reach the ***,this system can distinguish the type and number of nuclides in the sample by changing the distance between the detector and the sample according to each nucleus ***,the results show that the alpha emission rates in these bone samples are higher than the local values.

关键词： Radioactivity Animal bone CR-39 detector Track density Alpha range

Next generation sequencing under de novo genome assembly

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International Journal of Biomathematics 2015年第5期8卷 1-29页

作者： sonia Farhana Nimmy M. s. Kamal Department of Computer science and Engineering BGC Trust University BGC Biddha Nagar Chandanaish Chittagong Bangladesh

The next generation sequencing （NGs） is an important process which assures inexpen- sive organization of vast size of raw sequence dataset over any traditional sequencing systems or methods. Various aspects of NGs such as template preparation, sequencing imaging and genome alignment and assembly outline the genome sequencing and align- ment. Consequently, de Bruijn graph （dBG） is an important mathematical tool that graphically analyzes how the orientations are constructed in groups of nucleotides. Basi- cally, dBG describes the formation of the genome segments in circular iterative fashions. some pivotal dBG-based de novo algorithms and software packages such as T-IDBA, Oases, IDBA-tran, Euler, Velvet, ABYss, AllPaths, sOAPde novo and sOAPde novo2 are illustrated in this paper. Consequently, overlap layout consensus （OLC） graph-based algorithms also play vital role in NGs assembly. some important OLC-based algorithms such as.mira3, CABOG, Newbler, Edena, Mosaik and sHORTY are portrayed in this paper. It has been experimented that greedy graph-based algorithms and software pack- ages are also vital for proper genome dataset assembly. A few algorithms named ssAKE, sHARCGs and VCAKE help to perform proper genome sequencing.

关键词： Next generation sequencing (NGs) short read sequence (sRs) de Bruijngraph (dBG) sOAP denovo2 overlap layout consensus.