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theoretical study of differential cross sections for the ionization of helium by fast proton impact

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Chinese Physics B 2024年第11期33卷 255-264页

作者： m mondal B mandal t mistry D Jana m Purkait Department of Physics Ramakrishna Mission Residential CollegeNarendrapurKolkata-700103India

We present the angular distribution of the ejected electron for single ionization of He by fast proton impact.A fourbody formalism of the three-Coulomb wave is applied to calculate the triple differential cross sections at several impact energies in the scattering,perpendicular and azimuthal ***,the three-body formalism of three-Coulomb,two-Coulomb and first Born approximation models has also been used to study the many-body effect on electron emission and the validity of the *** the three-Coulomb wave model,the final state wave function incorporates distortion due to the three-body mutual Coulombic *** this formalism,we use an uncorrelated and correlated Born initial state,which consists of a plane wave for the incoming projectile times a two-electron bound state wavefunction of the helium atom representing the 1s2(1S)***,in the case of the three-body formalism,the initial state wavefunction consists of a long-range Coulomb distortion for the incoming projectile and one active electron of the He atom described by the Roothaan–Hartree–Fock *** structure with a single or two peaks with unequal intensity is observed in the angular distributions of the triple differential cross sections for the different kinematic *** addition,the influence of static electron correlations is investigated using different bound state wavefunctions for the ground state of the He *** the four-body formalism,the present computations are very fast by reducing a nine-dimensional integral to a two-dimensional real *** the simplicity and speed of the proposed quadrature,the comparison shows that the obtained results are in reasonable agreement with the experiment and are compatible with those of other theories.

关键词： ionization cross sections collision atoms ions

PV based water pumping system for agricultural irrigation

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Frontiers in Energy 2016年第3期10卷 319-328页

作者： t A BINSHAD K VIJAYAKUmAR m KALEESWARI Department of Electrical Engineering Malaviya National Institute of Technology Jaipur 302017 India Department of Electrical Engineering Poomima University Jaipur302017 India

this paper investigates the operation and analysis of the photovoltaic water pumping system in detail. Power electronic controllers were designed and developed for the water pumping system using a boost converter along with an inverter followed by an induction motor pump set. the proposed system could be employed in agricultural irrigation under any operating condition of varying natures of solar irradiances and temperatures. the configuration and implementation of the system were described in detail. Further, the detailed method of analysis and simulation characteristics of such PV water pumping system was also presented. With the concern of shortage of fossil fuel, global warming and energy security, the proposed PV based water pumping significant demand of electricity agricultural sector. system can meet the and serve for the

关键词： photovoltaic water pumping system power electronic controller solar irradiances and temperature

Regional tectonics, geology, magma chamber processes and mineralisation of the Jinchuan nickel-copper-PGE deposit, Gansu Province, China： A review

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Geoscience Frontiers 2016年第3期7卷 431-451页

作者： t.m. (mike) Porter Porter GeoConsultancy Pry Ltd. Linden Park 5065 SA Australia

the Jinchuan Ni-Cu-PGE deposit（〉500 mt @1.2%Ni,0.7%Cu,～0.4 g/t PGE）,one of the largest magmatic sulphide deposits in the world,is located within the westernmost terrane of the North China *** is hosted within the 6.5 km long,Neoproterozoic（～0.83 Ga） Jinchuan ultramafic intrusion,emplaced as a sill-like body into a Palaeoproterozoic suite of gneisses,migmatites,marbles and amphibolites,below an active intracratonic *** parental magma was high-mg basalt,generated through melting of subcrustal lithospheric mantle by a mantle plume during the initiation of Rodinia supercontinent *** lower Palaeozoic collision of the exotic Qilian Block with the breakup-related southern margin of the craton accreted a subduction complex,and emplaced voluminous granitic intrusions and foreland basin sequences within the craton,to as far north as *** the Cainozoic,allochthonous lower Palaeozoic rocks were thrust up to 300 km to the northeast over cratonic basement,to within 25 km of the Jinchuan *** Jinchuan ultramafic intrusion was injected into three interconnected sub-chambers,each containing a separate *** essentially comprises an olivine-orthopyroxene-chromite cumulate,with interstitial orthopyroxene,clinopyroxene,plagioclase and phlogopite,and is predominantly composed of lherzolite（～80%）,with an outer rim of olivine pyroxenite and cores of mineralised *** occurs as disseminated and net-textured sulphides,predominantly within the dunite,with lesser,PGE rich lenses,late massive sulphide accumulations,small copper rich pods and limited mineralised diopside skarn in wall rock *** principal ore minerals are pyrrhotite（the dominant sulphide）,pentlandite,chalcopyrite,cubanite,mackinawite and pyrite,with a variety of platinum group minerals and minor *** deposit underwent significant post-magmatic tremolite-actinolite,chlorite,serpentine and magnetite *** volume of thejinchuan intrusion accounts for 〈3%

关键词： Rodinia break-up rifting Plume related Deep staging chamber Olivine-orthopyroxene-chromite cumulate Net textured and disseminated sulphides Post-magmatic alteration

the geology, structure and mineralisation of the Oyu tolgoi porphyry copper-gold-molybdenum deposits, mongolia： A review

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Geoscience Frontiers 2016年第3期7卷 375-407页

作者： t.m.(mike) Porter Porter CeoConsultancy Ply Ltd. Linden Park 5065 SA Australia

the Oyu tolgoi cluster of seven porphyry Cu-Au-mo deposits in southern mongolia,define a narrow,linear,12 km long,almost continuously mineralised trend,which contains in excess of 42 mt of Cu and1850 t of Au,and is among the largest high grade porphyry Cu-Au deposits in the *** deposits lie within the Gurvansayhan island-arc terrane,a fault bounded segment of the broader Silurian to Carboniferous Kazakh-mongol arc,located towards the southern margin of the Central Asian Orogenic Belt,a collage of magmatic arcs that were periodically active from the late Neoproterozoic to Permotriassic,extending from the Urals mountains to the Pacific *** at Oyu tolgoi is associated with multiple,overlapping,intrusions of late Devonian（～372 to 370 ma） quartzmonzodiorite intruding Devonian（or older） juvenile,probably intra-oceanic arc-related,basaltic lavas and lesser volcaniclastic rocks,unconformably overlain by late Devonian（～370 ma） basaltic to dacitic pyroclastic and volcano sedimentary *** quartz-monzodiorite intrusions range from earlymineral porphyritic dykes,to larger,linear,syn-,late- and post-mineral dykes and *** was deposited within syn-mineral quartz-monzodiorites,but is dominantly hosted by augite basalts and to a lesser degree by overlying dacitic pyroclastic *** ore deposition,an allochthonous plate of older Devonian（or pre-Devonian） rocks was overthrust and a post-ore biotite granodiorite intruded at～365 *** is characterised by varying,telescoped stages of intrusion and *** A-type quartz veined dykes were followed by Cu-Au mineralisation associated with potassic alteration,mainly K-feldspar in quartz-monzodiorite and biotite-magnetite in basaltic *** reflux of cooled,late-magmatic hydrothermal fluid resulted in intense quartz-sericite retrograde alteration in the upper parts of the main syn-mineral intrusions,and an equivalent chlorite-muscovite/illite-hematite assemblage in bas

关键词： tectonic setting Porphyry copper-gold-molybdenum deposit High sulphidation Geology Alteration Structure

Application of In-Flight melting technology by RF Induction thermal Plasmas to Glass Production

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Plasma Science and technology 2008年第3期10卷 344-347页

作者：姚耀春 m.m.HOSSAIN t.WAtANABE F.FUNABIKI t.YANO National Engineering Laboratory of Vacuum metallurgy Kunming University of Science and Technology Kunming 650093 China Department of Environmental Chemistry and Engineering Tokyo Institute of Technology Yokohama 226-8502 Japan Department of Environmental Chemistry and Engineering Tokyo Institute of TechnologyYokohama 226-8502 Japan Department of Chemistry and materials Science Tokyo Institute of Technology Tokyo 152-8550 Japan

An innovative in-flight glass melting technology with induced thermal plasmas was developed for the purpose of energy conservation and environmental protection. two-dimensional modeling was used to simulate the thermofluid fields in the plasma torch. the in-flight melting behavior of glass raw material was investigated by various analysis methods. Results showed that the plasma temperature was up to 10000 K with a maximum velocity over 30 m/s, which made it possible to melt the granulated glass raw material within milliseconds. the carbonates in the raw material decomposed completely and the compounds in the raw material attainted 100% vitrification during the in-flight time from the nozzle exit to substrate. the particle melting process is similar to the unreacted-core shrinking model.

关键词： induced thermal plasmas in-flight melting plasma heat transfer glass production

tuning the particle size,physical properties,and photocatalytic activity of Ag_(3)PO_(4)materials by changing the Ag^(+)/PO_(4)^(3-)ratio

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Chinese Physics B 2023年第3期32卷 561-568页

作者： Hung N m Oanh L t m Chung D P thang D V mai V t Hang L t minh N V Center for Nano Science and technology Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi 100000Vietnam Department of Physics Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi 100000Vietnam Hanoi University of mining and Geology Duc Thang WardNorth Tu Liem DistrictHanoi 100000Vietnam Institute of materials Science Vietnam Academy of Science and Technology18 Hoang Quoc VietHanoi 100000Vietnam Faculty of Basic Sciences Hanoi University of Natural Resources and Environment41 A Phu Dien RoadNorth Tu LiemHanoi 100000Vietnam

this study demonstrates the influence of the Ag^(+)/PO_(4)^(3-)ratio in precursor solution on the crystal structural formation,morphology,physical properties,and photocatalytic performance of a Ag_(3)PO_(4)photocatalyst that is fabricated,using a facile precipitation method,from AgNO_(3)and Na2HPO_(4)·12H_(2)*** material characterizations were carried out using x-ray diffraction(XRD),scanning electron microscopy(SEm),energy-dispersive x-ray spectroscopy(EDX),Brunauer–Emmett–teller(BEt)surface area,Fourier transform infrared(FtIR)absorption,Raman scattering,x-ray photoelectron spectroscopy(XPS),UV-vis absorption,and photoluminescence(PL).the results show that Ag_(3)PO_(4)crystallizes better when the excess PO_(4)^(3-)content increases,and the lattice parameters decrease slightly,while the crystal diameter and the particle size *** change is also observed in the Raman scattering and FtIR spectra with the increase in the vibration frequency of the[PO_(4)]*** compression of the[PO_(4)]unit was also confirmed in the XPS spectra with the shift of P 2p peaks toward higher binding *** photocatalytic results showed that the samples synthesized from excess PO_(4)^(3-)solution exhibited higher photocatalytic performance compared to the sample with a Ag^(+)/PO_(4)^(3-)ratio of 3:1.A sample prepared from the precursor solution with a Ag^(+)/PO_(4)^(3-)ratio of 3:1.5 was optimal for RhB decomposition under both visible light and natural sunlight,completely decomposing 10 ppm RhB after 15 minutes of xenon lamp irradiation and after 60 minutes under solar light *** is attributed to the high crystallinity,small particle size and low electron–hole recombination rate of the sample.

关键词： morphology photocatalytic Ag^(+)/PO_(4)^(3-)ratio visible light

Dirac R-matrix calculations of photoionization cross sections of Ni Ⅻ and atomic structure data of Ni 

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Chinese Physics B 2017年第2期26卷 127-140页

作者： R t Nazirt m A Bari m Bilal S Sardar m H Nasim m Salahuddin Department of Physics and Applied mathematics Pakistan Institute of Engineering and Applied Sciences Islamabad 45650 Pakista

We performed R-matrix calculations for photoionization cross sections of the two ground state configuration 3s^23p^5（~2P_（3/2,1/2）~o） levels and 12 excited states of Ni Ⅻ using relativistic Dirac Atomic R-matrix Codes（DARC） across the photon energy range between the ionizations thresholds of the corresponding states and well above the thresholds of the last level of the Ni XIII target ion. Generally, a good agreement is obtained between our results and the earlier theoretical photoionization cross sections. moreover, we have used two independent fully relativistic GRASP and FAC codes to calculate fine-structure energy levels, wavelengths, oscillator strengths, transitions rates among the lowest 48 levels belonging to the configuration（3s^23p^4, 3s3p^5, 3p^6, 3s^23p^33d） in Ni XIII. Additionally, radiative lifetimes of all the excited states of Ni XIII are presented. Our results of the atomic structure of Ni XIII show good agreement with other theoretical and experimental results available in the literature. A good agreement is found between our calculated lifetimes and the experimental *** present results are useful for plasma diagnostic of fusion and astrophysical plasmas.

关键词： photoionization cross sections energy levels wavelengths lifetimes

Synthesis of crystalline perovskite-structured SrtiO_3 nanoparticles using an alkali hydrothermal process

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International Journal of minerals,metallurgy and materials 2016年第1期23卷 109-115页

作者： U.K.N.Din t.H.t.Aziz m.m.Salleh A.A.Umar Institute of microengineering and Nanoelectronics (ImEN) Universiti Kebangsaan Malaysia

We report an experimental route for synthesizing perovskite-structured strontium titanate （SrtiO3） nanocubes using an alkali hydrothermal process at low temperatures without further heating. Furthermore, we studied the influence of heating time （at 180℃） on the crystallinity, morphology, and perovskite phase formation of SrtiO3. the SrtiO3 powder, which is formed via nanocube agglomeration, transforms into cubic particles with a particle size of 120--150 nm after 6 h of hydrothermal sintering. the crystallinity and percentage of the perovskite phase in the product increased with heating time. the cubic particles contained 31.24at% anatase tiO2 that originated fi＇om the precursor. By varying the weight ratio of anatase tiO2 used to react with the strontium salt precursor, we reduced the anatase-tiO2 content to 18.8at%. However, the average particle size increased when the anatase-tiO2 content decreased.

关键词： strontium titanate nanoparticles anatase hydrothermal synthesis

timoshenko inclusions in elastic bodies crossing an external boundary at zero angle

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Acta mechanica Solida Sinica 2017年第3期30卷 327-333页

作者： A.m. Khludnev t.S. Popova Lavrentyev Institute of Hydrodynamics of R_AS Novosibirsk State University Novosibirsk 630090 Russia North-Eastern Federal University Yakutsk 677000 Russia

the paper concerns an analysis of equilibrium problems for 2D elastic bodies with a thin timoshenko inclusion crossing an external boundary at zero angle. the inclusion is assumed to be delaminated, thus forming a crack between the inclusion and the body. We consider elastic inclusions as well as rigid inclusions. to prevent a mutual penetration between the crack faces, inequality type boundary conditions are imposed at the crack faces. theorems of existence and uniqueness are established. Passages to limits are investigated as a rigidity parameter of the elastic inclusion going to infinity.

关键词： thin timoshenko inclusion Crack Delamination Fictitious domain method Non-penetration