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Ashutosh Sharma,Hansung Lee,Byungmin Ahn 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
In this study, equimolar AlCuSiFe-x (x = Cr, Mn, Zn, Sn) HEAs were fabricated by mechanical alloying (MA) and sparkplasma sintering methods (SPS). The MA was performed for 45 h followed by densification of powder compacts at 650 °C. The results revealed the formation of dual face-centered cubic (FCC) and body-centered cubic (BCC) structures in AlCuSiFex(x = Zn, Sn) while a single BCC solid solution was noticed in AlCuSiFe-x (x = Cr, Mn). After SPS treatment, AlCuSiFeSnalloy contained FCC with CuxSnywhile AlCuSiFe–Zn changed to FCC + BCC structure. Similarly, AlCuSiFeCr andAlCuSiFeMn showed the formation of BCC + FCC with additional σ- and μ-phases in the HEA matrix. The calculated thermodynamicparameters of HEAs also supported the formation of different solid-solution phases in each of the above HEAs. It was found that HEAs with the additive elements Sn and Zn tend to have major FCC phases, while those with Cr and Mngive rise to major BCC with brittle σ- and μ-phase, which further improves their mechanical strength.
Neha Sharma,Sunanda Sharda,Dheeraj Sharma,Vineet Sharma,P. B. Barman,S.C. Katyal,Pankaj Sharma,S. K. Hazra 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5
Steady state current-voltage characteristics of the amorphous (Se80Te20)98Y2 (Y = Ag, Bi, Ge, Cd) semiconductors at different temperatures are reported. The measurements were performed using direct-current voltage bias to understand the basic conductivity mechanism and to evaluate the impact of each substituent on electrical response. The space charge limited conduction mechanism, and the density of states near Fermi level have been calculated. The difference in electrical response due to different substitutions in the glassy matrix is analyzed.
Sharma, Mousumi,Sharma, Jagannath Dev,Sarma, Anupam,Ahmed, Shiraj,Kataki, Amal Chandra,Saxena, Rahul,Sharma, Dilutpal Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.11
Background: Breast cancer is a heterogeneous disease comprising of distinct biological subtypes with many targeted prognostic biomarkers having therapeutic implications. However, no specific targeted therapy for triple negative breast cancer has been discovered to date and hence further research is needed. Aim: The aim and objectives of the present study were to examine the prevalence of triple negative breast cancer (TNBC) in North-East India and to compare the clinicopathological parameters in two study groups defined by immunohistochemistry (IHC) - "TNBC" and "Others". Materials and Methods: We carried out a retrospective study in a cohort of 972 patients diagnosed with invasive breast carcinoma in the Department of Pathology, Dr. B. Borooah Cancer Institute, a Regional Cancer Centre for treatment and research, Guwahati, for a period of 3 years and 10 months from January 2010 to October 2013. Based on IHC findings, patients were divided into two groups - "TNBC" and "Others". All relevant clinicopathological parameters were compared in both. TNBC were defined as those that were estrogen receptor (ER), progesterone receptor (PR), and HER2/neu negative while those positive for any of these markers were defined as "Others". Results: In this study, out of total 972 cases 31.9% (310 cases) were defined as TNBC and 662 cases (68.1%) as "Others" based on IHC markers. Compared to the "Others" category, TNBC presented at an early age (mean 40 years), were associated with high grade large tumours and high rate of node positivity, IDC NOS being the most common histological subtype in TNBC. Conclusions: TNBC accounts for a significant portion of breast cancers in this part of India and commonly present at younger age and tend to be large high grade tumours.
Data Protection in Clouds using Two Stage Encryption
Pallav Sharma,Varsha Sharma,Sanjeev Sharma,Jitendra Agrawal 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.4
Cloud Computing has been an emergent technology that has opened the space for virtualization, as it provides many computational services and storage services over the Internet with the help of a browser. Cloud computing’s core comprises of services like platform, infrastructure and software as a service. The unpredicted boom in cloud computing is driven by its simple economic benefit. It helps in reducing capital expenses and minimizes operating expenses. This move however, has increased a major concern about the protection of data, as against the traditional system the data is now stored online and is far easily exposed than we realize. This raises a major security issue for data protection. Many techniques for protection of data have been proposed so far. However, the best available option till date is to encrypt user data before storing it over the cloud environment and decrypting it again before handing the data back to the cloud user. In this paper, we introduce a more efficient and stronger encryption process that allows a cloud service provider to protect user data more efficiently.
Non-destructive evaluation of steel and GFRP reinforced beams using AE and DIC techniques
Gaurav Sharma,Shruti Sharma,Sandeep K. Sharma 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.77 No.5
The paper presents an investigation of the widely varying mechanical performance and behaviour of steel and Glass Fibre Reinforced Polymer (GFRP) reinforced concrete beams using non-destructive techniques of Acoustic Emission (AE) and Digital Image Correlation (DIC) under four-point bending. Laboratory experiments are performed on both differently reinforced concrete beams with 0.33%, 0.52% and 1.11% of tension reinforcement against balanced section. The results show that the ultimate load-carrying capacity increases with an increase in tensile reinforcement in both cases. In addition to that, AE waveform parameters of amplitude and number of AE hits successfully correlates and picks up the divergent mechanism of cracking initiation and progression of failure in steel reinforced and GFRP reinforced concrete beams. AE activity is about 20- 30% more in GFRP-RC beams as compared to steel-RC beams. It was primarily due to the lower modulus of elasticity of GFRP bars leading to much larger ductility and deflections as compared to steel-RC beams. Furthermore, AE XY event plots and longitudinal strain profiles using DIC gives an online and real-time visual display of progressive AE activity and strains respectively to efficaciously depict the crack evolution and their advancement in steel-RC and GFRP-RC beams which show a close matching with the micro-and macro-cracks visually observed in the actual beams at various stages of loading.
Effect of Fading on Performance of VANET in Realistic Scenarios Using NCTUns6.0
Richa Sharma,Jyoteesh Malhotra,Komal Sharma 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.1
Road safety and increasing transport efficiency are the important goals for intelligent transport system (ITS). Vehicular Ad hoc Network is such a network which can help to achieve these goals. VANET routing is a crucial task for reliable communication among vehicles. The impact of fading on network throughput and packet drop is explored in this paper. Interesting results show the performance evaluation of without fading environment and Rayleigh fading in different scenarios. NCTUns 6.0 (National Chiao Tung University Network Simulator) is used to justify our results that is a GUI based open source platform for vehicular Ad-Hoc network. Various performance issues are also surveyed with the help of this simulator.
Experimental investigation of effective atomic numbers for some binary alloys
Renu Sharma,J.K. Sharma,Taranjot Kaur,Tejbir Singh,Jeewan Sharma,Parjit S. Singh 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.7
In the present work, the gamma ray backscattering technique was used to determine the effective atomic numbers for certain binary alloys. With the help of a muffle furnace, the binary alloys were synthesized using the melt quenching technique with different compositions of 82Pb, 50Sn, and 30Zn. The intensity distribution of backscattered photons from radioactive isotope 22Na (511 keV) was recorded with the help of GAMMARAD5 [76 mm × 76 mm NaI(Tl) scintillator detector] and analyzed as a function of both atomic number and thickness of the target material. The effective atomic numbers for the same binary alloys were also computed theoretically using the atomic to electronic cross-section method with the help of the mass attenuation coefficient database of WinXCom (2001). Good agreement was observed between theoretical and experimental results for the effective atomic numbers of all the selected alloys.