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metal-enhanced fluorescence of graphene oxide by palladium nanoparticles in the blue-green part of the spectrum

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Chinese Physics b 2016年第11期25卷 576-583页

作者： A Omidvar m R Rashidian Vaziri b Jaleh N Partovi Shabestari m Noroozi Department of Physics Bu-Ali Sina University Laser and Optics Research School NSTRI Tehran Iran Center for Research and Development of Petroleum Technologies at Kermanshah Research Institute of Petroleum Industry (RIPI)

Graphene oxide（GO） has a wide fluorescence bandwidth,which makes it a prospective candidate for numerous *** many of these applications,the fluorescence yield of GO should be further *** sp2-hybridized carbons in GO confine the π-*** recombination of electron-hole pairs in such sp2 clusters is the source of fluorescence in this *** nanoparticles are good catalysts for sp2 bond *** report on the preparation of GO,palladium nanoparticles and their nanocomposites in two different *** is shown that palladium nanoparticles can considerably enhance the intrinsic fluorescence of GO in the blue-green part of the visible light *** enhancement has been attributed to the catalytic role of palladium nanoparticles in increasing the number of sp2 bonds of GO with the molecules of the surrounding *** is shown that palladium nanoparticles could be the nanoparticle of choice for fluorescence enhancement of GO because of their catalytic role in sp2 bond formation.

关键词： palladium formations considerably bonds Palladium attributed numerous Fluorescence visible bandwidth

Design concerns of room and pillar retreat panels

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International Journal of mining Science and Technology 2017年第1期27卷 29-35页

作者： Klemetti Ted m. Sears morgan m. Tulu Ihsan b. mining Engineer Ground Control branch NIOSH Office of Mine Safety and Health ResearchPittsburghPAUSA

Why do some room and pillar retreat panels encounter abnormal conditions？ What factors deserve the most consideration during the planning and execution phases of mining and what can be done to mitigate those abnormal conditions when they are encountered7 To help answer these questions, and to determine some of the relevant factors influencing the conditions of room and pillar （R ＆ P） retreat min- ing entries, four consecutive R ＆ P retreat panels were evaluated. This evaluation was intended to rein- force the influence of topographic changes, depth of cover, multiple-seam interactions, geological conditions, and mining geometry. This paper details observations were made in four consecutive R ＆ P retreat panels and the data were collected from an instrumentation site during retreat mining. The pri- mary focus was on the differences observed among the four panels and within the panels themselves. The instrumentation study was initially planned to evaluate the interactions between primary and secondary support, but produced rather interesting results relating to the loading encountered under the current mining conditions. In addition to the obse^ation and ｜ll^trumentation, numerical modeling was per- formed to evaluate the stress condi~!ons. both the Lamodel 3.0 and Rocscience Phase 2 programs were used to evaluate these four panels, The results of both models indicated a drastic reduction in the vertical stresses experienced in these panels due to the full extraction mining in overlying seams when compared to the full overburden load. both models showed a higher level of stress associated with the outside entries of the panels. These results agree quite well with the observations and instrumentation studies performed at the mine. These efforts provided two overarching conclusions concerning R ＆ P retreat mine planning and execution. The first was that there are four areas that should not be overlooked during R ＆ P retreat mining： topographic relief, multiple^seaPa str

关键词： Room and pillar Retreat mining Deep coverSafety multiple seam

Effect of Pearlite Interlamellar Spacing on Predominant Abrasive Wear mechanism of Fully Pearlitic Steel

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材料热处理学报 2004年第05B期25卷 1207-1213页

作者： J. Ahmadi m. monirvaghefi m. Salehi b. Niroumand merat poolad engineering company Isfahan IranIsfahan University of Technology Department of materials engineering Isfahan IranIsfahan University of Technology Department of materials engineering Isfahan IranIsfahan University of Technology Department of materials engineering Isfahan Iran

The aim of this investigation was the determination of the predominant wear mechanism on three-body abrasion of fully pearlitic low alloy steel. Furthermore, the effect of pearlite interlamellar spacing on wear behavior was investigated. For this purpose, the samples were subjected to the different heat treating to attaining different interlamellar spacing. mechanical properties such as hardness, yield strength, tensile strength, elongation, and impact toughness were evaluated. Three body abrasion tests were conducted under ASTm standard condition using a rubber wheel abrasion test apparatus. Abraded surface and wear debris were investigated by light optical microscopy and scanning electron microscopy. The results showed that wear resistance of fully pearlitic steel depended to pearlite interlamellar spacing the and lower spacing has the greater wear resistance, so it may be due to subsurface work hardening and interlamellar spacing and cementite in fine and/or coarse pearlite, that influence on surface destruction during wear. Although during wear process the several mechanisms play roles, but study of surface and debris shows that with decreasing interlamellar spacing, the predominant mechanism wear changed from ploughing to cutting mode.

关键词：层间距珠光体三体磨损钢

Numerical Investigation of the Flow inside the Combustion Chamber of a Plant Oil Stove

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Journal of Thermal Science 2013年第5期22卷 491-496页

作者： b. Pritz m. Werler H. Wirbser m. Gabi Institute of Fluid machinery Karlsruhe Institute of Technology (KIT)Kaiserstr. 12 76131 Karlsruhe Germany Institute of Technical Thermodynamics KITKaiserstr. 12 76131 Karlsruhe Germany

Recently a low cost cooking device for developing and emerging countries was developed at KIT in cooperation with the company bosch und Siemens Hausger^ite GmbH. After constructing an innovative basic design further development was required. Numerical investigations were conducted in order to investigate the flow inside the combustion chamber of the stove under variation of different geometrical parameters. beyond the performance improvement a further reason of the investigations was to rate the effects of manufacturing tolerance problems. In this paper the numerical investigation of a plant oil stove by means of RANS simulation will be presented. In or- der to reduce the computational costs different model reduction steps were necessary. The simulation results of the basic configuration compare very well with experimental measurements and problematic behaviors of the ac- tual stove design could be explained by the investigation.

关键词： plant oil stove cooking device fuel evaporation combustion chamber CFD RANS

The Klein-Gordon and the Dirac Oscillators in a Noncommutative Space

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Communications in Theoretical Physics 2004年第5X期42卷 664-668页

作者： b.mirza m.mohadesi DepartmentofPhysics IsfahanUniversityofTechnologyIsfahan84154Iran

We study the Dirac and the Klein-Gordon oscillators in a noncommutative space. It is shown that the Klein-Gordon oscillator in a noncommutative space has a similar behaviour to the dynamics ofa particle in a commutative space and in a constant magnetic field. The Dirac oscillator in a noncommutative space has a similar equation to the equation of motion for a relativistic fermion in a commutative space and in a magnetic field, however a new exotic term appears, which implies that a charged fermion in a noncommutative space has an electric dipole moment.

关键词：振荡器非交换几何学兰道问题量子场

Noncommutative Geometry and Classical Orbits of Particles in a Central Force Potential

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Communications in Theoretical Physics 2004年第2X期42卷 183-184页

作者： b.mirza m.Dehghani InstituteforStudiesinTheoreticalPhysicsandmathematics P.O.Box5746Tehran19395Iran DepartmentofPhysics IsfahanUniversityofTechnologyIsfahan84154Iran

We investigate the effect of the noncommutative geometry on the classical orbits of particles in a central force potential The relation is implemented through the modified commutation relations [xi,xj] = iθij. Compar... 详细信息

关键词：非交换几何学行星轨道量子万有引力行星物理学莱布尼兹规则哈密顿算符

Performance evaluation of up-flow anaerobic sludge blanket(UASb) reactor for treatment of paper mill wastewater

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Journal of Environmental Sciences 2004年第2期16卷 194-198页

作者： m. mahadevaswamy b.m. Sadashiva murthy A.R. Girijamma Department of Environmental Engineering S.J.College of EngineeringDepartment of Environmental EngineeringS.J.College of EngineeringDepartment of Environmental EngineeringS.J.College of Engineering Mysore-570 006Karnataka StateIndiaMysore-570 006Karnataka StateIndiaMysore-570 006Karnataka StateIndia

The present study deals with the performance evaluation of the UASb reactor under varied organic loading rate(OLR) for the treatment of paper mill wastewater. The sludge granulation process started after 120 days from the start-up period. Sludge granules size was found to be 0 8 mm at OLR of 1 72 kgCOD/(m 3·d), which reached maximum size of about 1 0 to 1 2 mm at OLR of 2 1 kgCOD/(m 3·d). At the end of initial OLR of 1 0 kgCOD/(m 3·d) the VSS concentration was 12 86 gVSS/L, which got increased to 38 05 gVSS/L at the end of an OLR 2 1 kgCOD/(m 3·d). most of the times VFA recorded were well within the limit of VFA reported in anaerobic fermentation process. many times the pH observed was between 6 5 and 7 8, which is more favorable for any anaerobic process. It is also found that pH within the reactor increases along with the height of reactor. The total maximum biogas production was found to be 0 40 L/gCOD removals at OLR of 2 1 kgCOD/(m 3·d) and the maximum bOD removal at this stage was observed to be 90%.

关键词： UASb biogas anaerobic digestion sludge loading rate organic loading rate

On Thermodynamics of AdS black Holes in Arbitrary Dimensions

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Chinese Physics Letters 2012年第10期29卷 9-11页

作者： A.belhaj m.Chabab El moumni m.b.Sedra Centre of Physics and mathematics CPM-CNESTENRabatMorocco High Energy Physics and Astrophysics Laboratory FSSMCadi Ayyad UniversityMarrakeshMorocco UniversitéIbn Tofail Facultédes SciencesDépartement de PhysiqueLHESIRKénitraMorocco

Considering the cosmological constantΛas a thermodynamic pressure and its conjugate quantity as a thermodynamic volume as proposed by Kubiznak and mann[*** Energy Phys.1207(2012)033],we discuss the critical behavior of charged AdS black hole in arbitrary dimensions *** particular,we present a comparative study in terms of the spacetime dimension d and the displacement of critical points controlling the transition between the small and the large black *** behaviors vary nicely in terms of *** result shows that the equation of state for a charged Reissner–Nordstrom AdS black hole predicts an universal number given by(2d-5)/(4d-8).The three-dimensional solution is also discussed.

关键词： thermodynamic critical dimensions

The C–V and G/ω–V Electrical Characteristics of ^(60)Co γ-Ray Irradiated Al/Si_(3)N_(4)/p-Si (mIS) Structures

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Chinese Physics Letters 2013年第7期30卷 193-197页

作者： S.Zeyrek A.Turan m.m.bülbül Department of Physics Faculty of Arts and SciencesDumlupınar University43100KütahyaTurkey Department of Physics Faculty of SciencesGazi University06500BeşevlerAnkaraTurkey

The influence of ^(60)Co(γ-ray)irradiation on the electrical characteristics of Al/Si_(3)N_(4)/p-Si(mIS)structures is investigated using capacitance-voltage(C–V)and conductance-voltage(G/ω–V)*** mIS structures are exposed to a ^(60)Coγradiation source at a dose of 0.7 kGy/h,with a total dose range of 0–100 *** C–V and G/ω–V properties are measured before and after ^(60)Coγ-ray irradiation at 500 kHz and room *** is found that the capacitance and conductance values decrease with the increase in the total dose due to the irradiation-induced defects at the *** results also indicate thatγradiation causes an increase in the barrier height Фb,Fermi energy EF and depletion layer width W_(D).The interface state density(N_(ss)),using the Hill–Coleman method and dependent on radiation dose,is determined from the C–V and G/ω–V measurements and decreases with an increase in the radiation *** decrease in the interface states can be attributed to the decrease in the recombination centers and the passivation of the Si surface due to the deposition insulator layer(Si_(3)N_(4)).In addition,it is clear that the acceptor concentration NA decreases with increasing radiation *** profile of series resistance Rs for various radiation doses is obtained from forward and reverse-biased C–V and G/ω–V measurements,and its values decrease with increasing radiation dose,while it increases with increasing voltage in the accumulation region.

关键词： capacitance interface attributed