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Dust acoustic shock waves in magnetized dusty plasma

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Plasma Science and Technology 2018年第7期20卷 27-34页

作者： yashika ghai nimardeep kaur kuldeep singh n s saini Department of Physics Guru Nanak Dev UniversityAmritsar-143005India

We have presented a theoretical study of the dust acoustic （DA） shock structures in a magnetized, electron depleted dusty plasma in the presence of two temperature superthermal ions. By deriving a Korteweg-de Vries-Burgers equation and studying its shock solution, we aim to highlight the effects of magnetic field and obliqueness on various properties of the DA shock structures in the presence of kappa-distributed two temperature ion population. The present model is motivated by the observations of Geotail spacecraft in the Earth＇s magnetotail and it is seen that the different physical parameters such as superthermality of the cold and hot ions, the cold to hot ion temperature ratio, the magnetic field strength, obliqueness and the dust kinematic viscosity greatly influence the dynamics of the shock structures so formed. The results suggest that the variation of superthermalities of the cold and hot ions have contrasting effects on both positive and negative polarity shock structures. Moreover, it is noted that the presence of the ambient magnetic field affects the dispersive properties of the medium and tends to make the shock structures less wide and more abrupt. The findings of present investigation may be useful in understanding the dynamics of shock waves in dusty plasma environments containing two temperature ions where the electrons are significantly depleted.

关键词： dusty plasma KdV-Burgers superthermal distribution Earth's magnetotail

nonplanar dust acoustic solitary and rogue waves in an ion beam plasma with superthermal electrons and ions

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Plasma Science and Technology 2018年第7期20卷 64-71页

作者： nimardeep kaur kuldeep singh yashika ghai n s saini Guru nanak Dev University Amritsar-143005India

The propagation characteristics of dust acoustic solitary and rogue waves are investigated in an unmagnetized ion beam plasma with electrons and ions following kappa-type distribution in nonplanar geometry. The reductive perturbation method （RPM） is employed to derive the cylindrical/spherical Korteweg-de Vries （KdV） equation, which is further transformed into standard KdV equation by neglecting the geometrical effects. Using new stretching coordinates, nonlinear Schrrdinger equation （nLSE） has been derived from the standard KdV equation to study the different order rational solutions of dust acoustic rogue waves （DARWs）. The impact of various physical parameters on the characteristics of dust acoustic solitary waves （DASWs） is elaborated specifically in nonplanar geometry. Further, the effects of ion beam and superthermality of electrons/ions on the characteristics of DARWs are studied. The results obtained in the present investigation may be useful in comprehending a variety of phenomena in Earth＇s magnetosphere polar cap region where the presence of positive ion beam has been detected and also in other regions of space/astrophysical environments where dust along with superthermal electrons and ions exists.

关键词： dust acoustic ion beam kappa distribution rogue waves

Photon interaction with semiconductor and scintillation detectors

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nuclear Science and Techniques 2016年第3期27卷 159-170页

作者： v.p.singh n.m.badiger Department of Physics Karnatak UniversityDharwad 580003India

Mass attenuation coefficients,effective atomic numbers,and electron densities for semiconductor and scintillation detectors have been calculated in the photon energy range 1 keV-100 *** interaction parameters have been found to vary with detector composition and the photon *** variation in the parameters with energy is shown graphically for all the partial photon interaction *** effective atomic numbers of the detector were compared with the ZXCOM program,and the results were found to be *** of semiconductor and scintillation detectors are presented in terms of effective atomic *** study should be useful for comparing the detector performance in terms of gamma spectroscopy,radiation sensitivity,radiation measurement,and radiation *** results of the present investigation should stimulate research work for gamma spectroscopy and radiation measuring materials.

关键词：相互作用参数闪烁探测器半导体光子有效原子序数光谱探测器质量衰减系数能量变化

Controllability of multi-term time-fractional differential systems

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Journal of Control and Decision 2020年第2期7卷 109-125页

作者： Vikram singh Dwijendra n.Pandey Department of Mathematics Indian Institute of Technology RoorkeeRoorkee 247667India

In this paper,an abstract multi-term time-fractional differential system is considered and the exact controllability results are *** this theory,we tend to implement the basic tools of fractional calculus and measure of noncompactness to come up with a new set of sufficient conditions for the exact controllability by utilisation of Mönch fixed point ***,an application is given to illustrate the obtained results.

关键词： Fractional calculus exact controllability multi-term time-fractional delay differential system measure of noncompactness

Variability in cone,seed and seedling characteristics of Pinus kesiya Royle ***

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Journal of Forestry Research 2015年第2期26卷 331-337页

作者： Ombir singh Satyam Bordoloi n.Mahanta Forest Tree Seed Laboratory Silviculture DivisionForest Research Institute Biotechnology and Genetics Division Rain Forest Research Institute

Investigations were made to determine the nature and extent of variations present for 10 morphological characters of cone,seed and seedlings of 17 plus trees（PTs）of Pinus kesiya growing in eastern Himalayas（Meghalaya state） of *** significant variations has been observed in cone weight,cone length,cone diameter,seed length,seed diameter,seed weight,number of seeds per cone,seed germination,seedling height and seedling collar diameter among different PTs of the *** positive correlation（p ／ 0.01） between seed weight,cone length and cone diameter showed that seed weight in *** depend more on the cone *** germination is found positively correlated（p ／ 0.01） with seed weight,seed diameter,cone size and number of seeds per cone in the *** geographical factors,latitude and altitude are found positively correlated（p ／ 0.05） with cone weight and seed diameter,*** genetic parameters for seed,cone and seedlings of PTs of *** also showed a wide range of variability in terms of variance,coefficient of variability,broad sense heritability,genetic advance and genetic *** weight,seeds per cone and seedling diameter showed high heritability values（[75） coupled with maximum genetic *** with such values indicate the presence of good amount of heritable additive components and are under strong genetic *** findings of the study revealed that PTs expressed both phenotypic and genotypic differences in the seed,cone and seedling characters,which may be attributed to the differences in genetic makeup of various PTs and environmental factors *** and environmental *** presence of high variability in *** PTs for different characters provide further opportunities to improve the population in subsequent generations so as to establish this species as an important timber tree to be grown on less fertile and degraded soils in its distributional ranges.

关键词： Plus trees Seed traits Heritability Genetic gain Improvement

Dissection of a rapidly evolving wheat resistance gene cluster by long-read genome sequencing accelerated the cloning of Pm69

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Plant Communications 2024年第1期5卷 69-83页

作者： Yinghui Li Zhen-Zhen Wei Hanan Sela Liubov Govta Valentyna Klymiuk Rajib Roychowdhury Harmeet singh Chawla Jennifer Ens Krystalee Wiebe Valeria Bocharova Roi Ben-David Prerna B.Pawar Yuqi Zhang Samidha Jaiwar Istvan Molnar Jaroslav Dolezel Gitta Coaker Curtis J.Pozniak Tzion Fahima Institute of Evolution University of HaifaMt.CarmelHaifa 3498838Israel The Department of Evolutionary and Environmental Biology University of HaifaMt.CarmelHaifa 3498838Israel The Institute of Plant Protection Sichuan Academy of Agricultural SciencesChengdu 610066China Crop Development Centre and Department of Plant Sciences University of Saskatchewan51 Campus DriveSaskatoonSK S7N 5A8Canada Department of Vegetables and Field Crops Institute of Plant SciencesAgricultural Research Organization(ARO)–Volcani CenterRishon Lezion 7505101Israel Department of Crop Genomics and Bioinformatics China Agricultural UniversityBeijing 100094China Institute of Experimental Botany of the Czech Academy of Sciences Centre of the Region Hana´for Biotechnological and Agricultural ResearchSlechtitelu 3177900 OlomoucCzech Republic Plant Pathology Department University of CaliforniaDavisDavisCA 95616USA Present address:Department of Plant Science University of ManitobaWinnipegMB R3T 2N2Canada Present address:Agricultural Institute Centre for Agricultural ResearchELKHMartonvasar 2462Hungary

Gene cloning in repeat-rich polyploid genomes remains ***,we describe a strategy for overcoming major bottlenecks in cloning of the powdery mildew resistance gene(R-gene)Pm69 derived from tetraploid wild emmer wheat.A conventional positional cloning approach was not effective owing to suppressed *** sorting was compromised by insufficient purity.A Pm69 physical map,constructed by assembling Oxford nanopore Technology(OnT)long-read genome sequences,revealed a rapidly evolving nucleotide-binding leucine-rich repeat(nLR)R-gene cluster with structural variations.A single candidate nLR was identified by anchoring RnA sequencing reads from susceptible mutants to OnT contigs and was validated by virus-induced gene ***69 is likely a newly evolved nLR and was discovered in only one location across the wild emmer wheat distribution range in ***69 was successfully introgressed into cultivated wheat,and a diagnostic molecular marker was used to accelerate its deployment and pyramiding with other R-genes.

关键词： cluster resistance Israel

Synthesis of CaWO_4:Eu^(3+) phosphor powders via ethylene glycol route and its optical properties

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Journal of Rare Earths 2012年第4期30卷 310-314页

作者： K.Gayatri Sharma n.Rajmuhon singh Department of Chemistry Manipur University Canchipur-795003 Imphal Manipur India

Eu3＋ doped CaWO4 with tetragonal system were prepared at comparatively low temperature （125 ℃） in ethylene glycol medium. The phosphor was further investigated by X-ray difffactometer （XRD）, photoluminescence spectrophotometer （PL）, Fourier transform infra red （FT-IR） spectroscopy and transmission electron microscopy （TEM）. XRD analysis indicated a decrease in the unit cell volume of CaWO4 with increasing Eu3＋ ion concentration. It indicated the homogeneous substitution of Ca2＋ ions in CaWO4 by the Eu3＋ ions. TEM images showed that the particle size ranged from 20 to 200 nm and it could extend the application of the nanoparticles. The photoluminescence study showed that the intensity of electric dipole transition （SD0→TF2） at 614 nm dominated over the magnetic dipole transition （SD0→TFx） at 592 nm. The optimum concentration of Eu3＋ for the highest luminescence was found to be 20 at.%. The as prepared samples were found to be dispersible in water and methanol.

关键词： CaWO4:Eu3+ capping agent photoluminescence dispersible rare earths

A study on the comparative review of cool roof thermal performance in various regions

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Energy and Built Environment 2022年第3期3卷 327-347页

作者： Mohan Rawat R.n.singh School of Energy and Environment Studies Devi Ahilya UniversityTakshashila CampusKhandwa RoadIndore452001Madhya PradeshIndia

Energy demand is growing significantly worldwide to create thermal comfort in ***-conditioning is contributing to energy consumption at a massive scale in the residential and commercial *** roof is one of the most critical components of the building envelopes,and it achieved maximum heat gain in summer,and it covered nearly 20-25%of overall urban surface *** this respect,cool roofs are considered one of the sustainable solutions to maintain thermal comfort in *** results achieved from the literature review indicate that cool roof application reduced energy use in the buildings and a useful tool to mitigate Urban Heat Island(UHI)*** paper summarizes cool roof thermal performance with different types of surface coatings in different climatic zones for buildings with additional benefits,limitations,and recommendations for future research *** results of this review can be helpful for engineers,researchers,dwellers,and architectures to have a good understanding of the benefits of cool roofs to mitigate energy consumption demand in dwelling in a sustainable,cost-effective,and energy-efficient *** average energy-saving effect of the roof is expressed from 15%to 35.7%in different climatic zones(Temperate,Tropical,Composite,Hot and Warm-Humid)as per the literature survey ***,the average roof surface temperature reduction is possible from 1.4℃ to up to 4.7℃ using cool roof technology.

关键词： Cool roof Building envelope Heat gain Solar reflectance Thermal comfort

Genotypic Variation in Spatial Distribution of Fe in Rice Grains in Relation to Phytic Acid Content and Ferritin Gene Expression

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Rice science 2020年第3期27卷 227-236页

作者： Anurag MISHRA MdSHAMIM MdWASIM Siddiqui Akanksha singh Deepti SRIVASTAVA K.n.singh Department of Plant Molecular Biology and Genetic Engineering Narendra Deva University of Agriculture and TechnologyKumarganjFaizabadUttar Pradesh 224229India Division of Genetics ICAR-Indian Agricultural Research InstituteNew Delhi 110012India Department of Molecular Biology and Genetic Engineering Dr.Kalam Agricultural CollegeKishanganj(Bihar Agricultural UniversitySabourBhagalpur)Bihar 855107India Department of Post-Harvest Technology Bihar Agricultural UniversitySabourBhagalpurBihar 813210India Integral Institute of Agricultural Science and Technology(IIAST)Integral University Kursi RoadDasauliUttar Pradesh 226026India

Rice varieties having high Fe concentration in the endospermic region can be used as a good source for Fe deficit *** this study,303 Oryza sativa varieties and 1 Oryza rufipogon accession were assessed for spatial Fe accumulation in grains by Prussian blue staining *** ferritin protein distribution in grains was visualized by immunohistochemistry,and ferritin expression was assessed in selected rice varieties using semi-quantitative reverse transcription *** popular rice varieties,namely Sarjoo 52,Madhukar and Jalmagna,and the *** variety showed Fe in all the regions of grains,and the highest Fe concentration was observed in the embryo *** high-yielding varieties like Swarna,Swarna Sub 1,CSR13 and nDRR359 had lower Fe concentration in the embryo *** highest Fe concentration was detected in ***(49.8μg/g),followed by Sarjoo 52(26.1μg/g)and Madhukar(25.7μg/g).Phytic acid concentration was the minimum in ***(5.75 mg/g)followed by Sarjoo 52(5.83 mg/g).Western blot and semi-quantitative reverse transcription PCR showed higher expression of ferritin gene in ***,Sarjoo 52 and *** conclusion,*** and Sarjoo 52 had higher Fe concentration in the embryo regions as well as endosperm and aleurone layer,whereas the other varieties had lower Fe concentration in the *** 52 could be used as a donor in the rice breeding program for the generation of new varieties with elevated grain Fe concentration.

关键词： bio-fortification iron accumulation ferritin tissue-specific localization iron deficit population