http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Gope, Rajalakshmi (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Experimental investigation of pug cutter embedded TIG welding of Ti-6Al-4V titanium alloy
Deepak Kumar Gope,Uday Kumar,Somnath Chattopadhyaya,Sanjoy Mandal 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.6
Light-weight materials, such as titanium alloy, have been extensively investigated. This paper primarily focuses on microstructural, metallurgical, and mechanical properties of the pug cutter embedded tungsten inert gas (TIG) welding of Ti-6Al-4V titanium alloy. In this work, TIG welding was modified to control the speed and the arc length. Analysis revealed that the microstructure underwent severe changes at different zones: coarsened in the fusion zone (FZ) and enlarged in the heat-affected zone (HAZ). The microstructure was finer at the base metal than those in the FZ and the HAZ, and the Vickers hardness values decreased from weld center line to the base metal. Tensile test showed that the specimen with low current and high speed was broken below its ultimate tensile strength, whereas most of the samples were broken at the base metal region that had a similar strength to that of the parent metal. The elongation of the metal was primarily affected by the heat input. A high volume of heat increased the hardness and the brittleness, resulting in low ductility.
-
Keshava, Rohini,Muniyappa, Nagesh,Gope, Rajalakshmi,Ramaswamaiah, Ananthanarayana Saligrama Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.4
Imperata cylindrica, a tall tufted grass which has multiple pharmacological applications is one of the key ingredients in various traditional medicinal formula used in India. Previous reports have shown that I. cylindrica plant extract inhibited cell proliferation and induced apoptosis in various cancer cell lines. To our knowledge, no studies have been published on the effect of I. cylindrica leaf extract on human oral cancers. The present study was undertaken in order to evaluate the anticancer properties of the leaf extract of I. cylindrica using an oral squamous cell carcinoma cell line SCC-9 as an in vitro model system. A methanol extract from dried leaves of I. cylindrica (ICL) was prepared by standard procedures. Effects of the ICL extract on the morphology of SCC-9 cells was visualized by microscopy. Cytotoxicity was determined by MTT assay. Effects of the ICL extract on colony forming ability of SCC-9 cells was evaluated using clonogenic assay. Cell cycle analysis was performed by flow cytometry and induction of apoptosis was determined by DNA fragmentation assay. The ICL extract treatment caused cytotoxicity and induced cell death in vitro in SCC-9 cells in a dose-dependent manner. This treatment also significantly reduced the clonogenic potential and inhibited cell proliferation by arresting the cell cycle in the G2/M phase. Furthermore, DNA fragmentation assays showed that the observed cell death was caused by apoptosis. This is the first report showing the anticancer activity of the methanol extracts from the leaves of I. cylindrica in human oral cancer cell line. Our data indicates that ICL extract could be considered as one of the lead compounds for the formulation of anticancer therapeutic agents to treat/manage human oral cancers. The natural abundance of I. cylindrica and its wide geographic distribution could render it one of the primary resource materials for preparation of anticancer therapeutic agents.
-
Rajak Dilip Kumar,Guria Chandan,Gope Laldeep,Jibran Jahir Ahamad 한국자원공학회 2023 Geosystem engineering Vol.26 No.5
The rising demands for critical metals and the environmental impact of solid waste disposal have increased interest in recycling of spent lithium-ion batteries (LiBs). This study was focused on hydrometallurgical recycling of LCMO type cathode batteries for the recovery of critical metals (lithium, cobalt, and manganese). The process involves sulfuric acid leaching in the presence of a reducing agent (H2O2) followed by the precipitation recovery of critical metals. The influential parameters like pulp density, H2SO4 concentration, H2O2 addition, agitation time, and temperature were optimized, yielding >98% leaching in 2.0 M H2SO4 with 4 vol.% of H2O2 at a moderate temperature of 50°C. Reaction kinetics revealed that the leaching was governed by the mixedcontrol process. Furthermore, the separation and recovery of metals from leach liquor was conducted by simple precipitation techniques, where KMnO4, C2H2O4, and Na2CO3 were used as precipitating reagents to recover MnO2, CoC2O4, and Li2CO3, respectively.
-
Mandal Prasanta,Mazumder Nilesh,Saha Subhajit,Ghorai Uttam Kumar,Roy Rajarshi,Das Gopes Chandra,Chattopadhyay Kalyan Kumar 한국물리학회 2021 Current Applied Physics Vol.25 No.-
Delafossite compounds are layered ternary oxides known for simultaneous exhibition of significant carrier conduction and optical transparency. To survey effect of simultaneous cationic and anionic hole doping in prototype delafossite CuCrO2, we have analyzed the structural, optical, impedance and transport mechanism of CuCr1 xLixO2 ySy (x and y ranging 0–2 atomic %) prepared by solid state heating. The substitutional site occupancy of Li•• Cr and S×O are confirmed and quantified by Rietveld analysis. Valence band dispersion is demonstrated upon Li•• Cr and S×O co-doping by x-ray photoelectron spectroscopy with extended contribution from shallow S 3p antibonding states. From diffuse reflectance spectra, the optical gap (~3.5 eV) is evaluated to be wide even upon co-doping. Carrier density and hole mobility for CCO/(Li•• Cr +S×O ) to be 5.32 × 1015 cm 3 and 23.50 cm2V 1s 1, respectively. This scheme of band engineering is indicative of a more persuasive alternative to reach the hole conductivity bottleneck threshold.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
