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| 1 | Rational design of monovalent ions (Li,Na,K) co-doped ZnAl2O4:Eu3+ nanocrystals enabling versatile robust latent fingerprint visualization显示文摘Alkali metal ions(M+ = Na+,Li+,K+) co-doped ZnAl2O4:Eu3+(5 mol%)(ZAE) nanopowders(NPs) were prepared via solution combustion route using Mimosa pudica(MP) leaves extract as a fuel. PXRD results of co-doped samples enhance the crystallinity and grain growth. Photoluminescence(PL) of the prepared ZAE and ZAE:M+(M+ = Na+, Li+, K+) NPs shows intense emission peaks in the range of 550-750 nm and ascribed to 5D0→7FJ(J=0-4) transitions of Eu3+ ions, respectively. A 2-fold enhancement in PL intensity was observed in Li+ co-doped samples. The optimized ZnAl2O4:Eu3+(5 mol%), Li+(1 wt%)(ZAEL)NPs were used to visualize LFPs on various porous, semi-porous and non-porous surfaces through robust powder dusting technique. The visualized latent fingerprints(LFPs) reveal well defined level 1-3 ridge characteristics under several tests such as fingerprint aging and fresh water treatment for various time durations. The obtained results clearly evidence that the prepared NPs are quite useful for multifunctional applications such as advanced forensic and solid state lightning. | F.Femila Komahal H.Nagabhushana R.B.Basavaraj G.P.Darshan Hajeebaba K.Inamdar S.C.Sharma B.Daruka Prasad | 2019 | Journal of Rare Earths2019，37，7： | 2 |
| 2 | Rapid visualization of latent fingerprints using novel CaSiO_3:Sm^(3+) nanophosphors fabricated via ultrasound route显示文摘Latent fingerprints (LFPs) were the most significant identification method for individualization. Most commonly available fingerprints (FPs) in crime spot investigation were latent and patent types. Generally,LFPs were invisible and thus the effective visualization technique necessitates for the analysis of such FPs. In the past years, many traditional visualization techniques have been employed, but suffered with low resolution, sensitivity, contrast and high background noise. To overcome such limitations, we synthesized Sm^(3+) doped CaSiO_3 nanophosphors (NPs) via an ultrasound irradiation route using mimosa pudica (m. p.)leaves extract as a bio-surfactant. The morphological behavior of the prepared samples was extensively studied by varying the concentration of the m. p. extract, ultrasound irradiation duration, pH level of the precursor solution and sonication power. The photoluminescence (PL) emission spectra exhibit characteristic peaks at~561,601 and 647 nm, which were attributed to^5G_(5/2)→~6H_J(J=5/2,7/2 and 9/2) transitions of Sm^(3+) ions.The Judd-Ofelt(J-O) intensity parameters and other radiative properties were estimated using PL data. The Commission International de I'Eclairage (CIE) color coordinates were positioned in orange-red region shows average correlated color temperature (CCT) value of~3576 K. The optimized samples can be used as a labeling agent for the visualization of LFPs on various porous and non-porous surfaces under normal light irradiation. The visualized FPs reveals well defined ridge characteristics, namely whorl, loop,arch, bifurcation, eye, island, bridge, sweat pores, etc, with high sensitivity, selectivity, low contrast and background hindrance. Aforementioned results evidence that the prepared CaSiO_3:Sm^(3+) NPs were promising luminescent materials for solid state lighting and forensic applications. | R.B.Basavaraj G.P.Darshan B.Daruka Prasad S.C.Sharma H.Nagabhushana | 2019 | Journal of Rare Earths2019，37，1： | 2 |
| 3 | Multifunctional Dy(Ⅲ)doped di-calcium silicate array for boosting display and forensic applications显示文摘Latent fingerprints(LFPs) are the major physical evidences for the identification of individuals during crime spot investigation. Till date, numerous methods were followed to visualize LFPs. However, simple,accurate, and cost-effective method has wide scope in advanced forensic field. In our work, Ca_2 SiO_4:Dy^(3+)nanopowders(NPs) were fabricated via solution combustion route. The optimized sample was employed for the visualization of overlapped LFPs by the cost effective powder dusting method. The obtained results reveals the complete three levels of ridge characteristics with high sensitivity, reproducibility,selectivity, and reliability on various complex surfaces. The photoluminescence(PL) spectra consist of intense peaks at ~ 480 and 574 nm owing to ~4 F_(9/2) →~6 H_(15/2) and ~4 F_(9/2)→~6 H_(13/2) 4 f transitions of Dy3+ ions,respectively. The photometric properties confirm that the samples exhibit intense white emission with high color purity. Therefore, the prepared NPs could be a definitive choice as an advanced luminescent NPs for forensic, solid state lighting and portable FED devices. | M.Venkataravanappa R.B.Basavaraj G.P.Darshan B.Daruka Prasad S.C.Sharma P.Hema Prabha S.Ramani H.Nagabhushana | 2018 | Journal of Rare Earths2018，36，7： | 1 |
| 4 | Al-Cu-Li合金AA2195在低应变速率和3.5%NaCl溶液中的抗裂性能显示文摘研究Al-Cu-Li合金AA2195在3.5% NaCl环境中的耐蚀和抗裂性能,并将其与另一高强合金AA2219进行比较。采用浸泡腐蚀和恒电位极化实验测定合金的总耐蚀性能;采用低应变速率测试法确定合金的应力腐蚀开裂(SCC)性能。利用SEM-EDS和光学测量技术对合金样品进行表征以研究其腐蚀形貌、元素含量和腐蚀深度的变化。用韧性的减少量作为估算合金应力腐蚀开裂(SCC)敏感性的一个参数。结果表明,由于较低的腐蚀速率、较小的腐蚀深度和宽度,AA2195合金比AA2219合金具有更好的耐蚀性能。然而,两种合金的SCC参数(ε_(NaCl)/ε_(air))均大于0.90,说明此两种合金均具有较好的抗裂性能。断裂样品的SEM-EDS结果表明,两种合金均为典型的脆性断裂形貌。 | R.GHOSH A.VENUGOPAL P.RAMESH NARAYANAN S.C.SHARMA P.V.VENKITAKRISHNAN | 2017 | Transactions of Nonferrous Metals Society of China2017，27，2： | 0 |
| 5 | Hardness, Wear Resistance and Fracture Toughness of Cast Hiduminium/Corundum Particulate Composites显示文摘This paper reports some results obtained in an investigation to see how increasing the corundum dispersoid content from 0% to 7% in a matrix of as-cast and wrought hiduminium alloy affects the hardness. wear resistance and fracture toughness of the composite. The results show that as the corundum content is increased, the hardness and the wear resistance increase remarkably,whereas the fracture toughness drops significantly. It was found that Just a minute amount of corundum is sufficient to cause a fairly large change in these mechanical properties. The hardness of the material is also affected signifIcantly by the aging time. Moreover, if other factors are kept constant, hot extrusion improves both its hardness and its wear resistance. whereas the fracture toughness is | K.H.W.Seah(Dept. of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260)R.S.Kulkarni and S.C.Sharma (Dept. of Mechanical Engineering, R.V.College of Engineering, Mysore Road, Bangalore-560-059, Karnataka, Ind | 1996 | Journal of Materials Science & Technology1996，12，5： | 0 |
| 6 | Properties of Cast Hiduminium/Corundum Particulate Composites显示文摘This paper reports some results obtained in an investigation to see how increasing the corundum dispersoid content from o% to 7% in a matrix of hiduminium alloy affects the tensile and compressive strengths, the hardness and the casting characteristics of the composite. The results show that as the corundum content is increased, ultimate tensile strength (UTS)- compressive strength and hardness increase remarkably, whereas fluidity of the molten composite during casting drops significantly. It was found that just a minute amount of corundum is sufficient to cause a fairly large change in the mechanical properties and the fluidity of the molten material.This drop in castability is one of the reasons why adding corundum beyond 7 percent is not recommended. If other factors are kept constant, the fluidity is seen to slightly improve if the pouring temperature of the molten metal were increased from 670 to | K.H. W. Seah(Dept. of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511)R.S.Kulkari and S.C.Sharma (Dept. of Mechanical Engineering, R.V.College of Engineering, Mysore Road, Bangalore-560-059, Karnataka, Ind | 1995 | Journal of Materials Science & Technology1995，11，3： | 0 |
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