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| 1 | Property mapping of polycrystalline diamond coatings over large area显示文摘Large-area polycrystalline diamond(PCD)coatings are important for fields such as thermal management,optical windows,tribological moving mechanical assemblies,harsh chemical environments,biological sensors,etc.Microwave plasma chemical vapor deposition(MPCVD)is a standard technique to grow high-quality PCD films over large area due to the absence of contact between the reactive species and the filament or the chamber wall.However,the existence of temperature gradients during growth may compromise the desired uniformity of the final diamond coatings.In the present work,a thick PCD coating was deposited on a 100-mm silicon substrate inside a 915-MHz reactor;the temperature gradient resulted in a non-uniform diamond coating.An attempt was made to relate the local temperature variation during deposition and the different properties of the final coating.It was found that there was large instability inside the system,in terms of substrate temperature(as high asΔT=212℃),that resulted in a large dispersion of the diamond coating’s final properties:residual stress(-15.8 GPa to+6.2 GPa),surface morphology(octahedral pyramids with(111)planes to cubo-octahedrals with(100)flat top surfaces),thickness(190μm to 245μm),columnar growth of diamond(with appearance of variety of nanostructures),nucleation side hardness(17 GPa to 48 GPa),quality(Raman peak FWHM varying from 5.1 cm^(-1) to 12.4 cm^(-1) with occasional splitting).This random variation in properties over large-area PCD coating may hamper reproducible diamond growth for any meaningful technological application. | Awadesh Kumar MALLIK Sandip BYSAKH Monjoy SREEMANY Sudakshina ROY Jiten GHOSH Soumyendu ROY Joana Catarina MENDES Jose GRACIO Someswar DATTA | 2014 | Journal of Advanced Ceramics2014，3，1： | 4 |
| 2 | A framework for analyzing e-commerce security显示文摘 | Someswar Kesh Sam Ramanujan Sridhar Nerur | 2002 | Journal of In- formation Management & Computer Security2002，，4： | 1 |
| 3 | The repair of segmental bone defects with porous bioglass: An experimental study in goat显示文摘 | Samit K. Nandi Biswanath Kundu Someswar Datta Dipak K. De Debabrata Basu | 2008 | Research in Veterinary Science2008，，1： | 1 |
| 4 | Expanded graphite as an electrode material for an alcohol fuel cell显示文摘 | Arup B Ashoke H Someswar C | 2004 | Power Sources2004，136，： | 1 |
| 5 | Case based reasoning显示文摘 | | 1995 | Journal of Systems Management1995，，： | 1 |
| 6 | 氧化铝-石墨钎焊接头在电子管应用中的热循环行为(英文)显示文摘以Ti-Cu-Ag(68.8Ag-26.7Cu-4.5Ti,质量分数,%)为钎料,在895、900、905和910℃温度下,在0.67mPa真空环境中持续10 min,采用活泼金属钎焊技术钎焊氧化铝和石墨。在30-600℃对钎焊样品进行热循环并对其进行表征。X射线衍射结果表明,钛和碳之间的强烈反应同钛和氧化铝的一样。扫描电子显微分析和氦气密封性试验表明,初始样品和热循环钎焊样品没有出现裂缝或其它缺陷和气密性问题。实验得到了钎焊强度满意的接头。 | Nadadulal DANDAPAT Sumana GHOSH Kalyan Sundar PAL Someswar DATTA Bichitra Kumar GUHA | 2014 | Transactions of Nonferrous Metals Society of China2014，24，6： | 0 |
| 7 | Numerical simulation and experiment of error field measurement using luminous trace of electron beam in SST-1显示文摘In contrast to the earlier experiments conducted in other machines, here, in SST-1 the error field measurement experiment is performed with a filled gas pressure ~8×10^-4 mbar which helped to create a luminescent toroidal beam of electron path originated due to impact excitation and guided by the toroidal magnetic field. Beam path deviations are observed and recorded from radial and top ports using visible range cameras. Such creation and detection of the electron beam path differs from the earlier works where the gun emitted electron beam deviation in ultrahigh vacuum was detected on a collector-grid/fluorescent screen. In the present experiment, large beam deviations were observed. Later investigation of the experimental set-up reveals existence of a possible source of radial electric field in between the source and the vacuum vessel which are separately grounded. Thus, to understand the observed phenomena, experiments are numerically modeled with deviated TF coil set, PF coil set and the electron source location. A particle tracing code is used to follow the electron path in the magnetic field generated by the coil set of interest. Simulation results suggest that the large deviation corresponds to the E×B drifts and not due to the large field errors. Toroidally averaged field errors of the SST-1 TF coils at toroidal field of B0?=?15 kG are negligibly small ~B0?×?10^-6 or less, which should not adversely affect the plasma performance. | Someswar DUTTA Y PARAVASTU J DHONGDE H CHUDASMA S GEORGE K DHANANI A MAKWANA C DODIYA P VARMORA D K SHARMA A K SINGH U KUMAR D RAVAL U PRASAD Z KHAN R SRINIVASAN D RAJU | 2019 | Plasma Science and Technology2019，21，10： | 0 |
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