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RISS 인기검색어
- 검색키워드
- 저자 : Saini, S (검색결과 127 건)
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Saini, S.,Takamura, M.,Mukaida, M.,Kim, S.-J. Elsevier 2011 Current Applied Physics Vol.11 No.5
<P><B>Abstract</B></P><P>The thin film of <I>a</I>-axis oriented YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> (Y123) were grown on SrLaGaO<SUB>4</SUB> (100) substrate with a buffer layer of 50 nm thick Gd<SUB>2</SUB>CuO<SUB>4</SUB> using pulsed laser deposition technique. The thickness of Y123 thin film is about 400 nm CuO<SUB>2</SUB> planes are aligned perpendicular to the substrate in the thin films. A micron-bridge was fabricated using focused ion beam milling technique in such a way that the current was forced to flow along the <I>c</I>-axis in thin film. Intrinsic Josephson junctions are aligned along the <I>c</I>-axis. The dimensions of bridge are 1 μm in length along the <I>c</I>-axis and 5 μm in width along the <I>b</I>-axis. Transition temperature (<I>T<SUB>cON</SUB></I>) is about 84 K with single phase. The critical current density (<I>J<SUB>c</SUB></I>) of 2 × 10<SUP>6</SUP> A/cm<SUP>2</SUP> was measured from current–voltage (<I>I–V</I>) characteristics at 10 K. The samples were irradiated with external microwave of 20 GHz at different power and the <I>J<SUB>c</SUB></I> was suppressed as we increased the power. This suppression in <I>J<SUB>c</SUB></I> indicates the formation of layered structure with strong coupling. The voltage steps are appeared in non-linear <I>I–V</I> characteristics with microwave irradiation. The voltage steps are collective response of intrinsic Josephson junctions of micron-bridge.</P>
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Saini, Ramesh Kumar,Keum, Young-Soo Elsevier 2018 Life sciences Vol.203 No.-
<P><B>Abstract</B></P> <P>Linoleic acid (LA) (n−6) and α-linolenic acid (ALA) (n−3) are essential fatty acids (EFAs) as they cannot be synthesized by humans or other higher animals. In the human body, these fatty acids (FAs) give rise to arachidonic acid (ARA, n−6), eicosapentaenoic acid (EPA, n−3), and docosahexaenoic acid (DHA, n−3) that play key roles in regulating body homeostasis. Locally acting bioactive signaling lipids called eicosanoids derived from these FAs also regulate diverse homeostatic processes. In general, ARA gives rise to pro-inflammatory eicosanoids whereas EPA and DHA give rise to anti-inflammatory eicosanoids. Thus, a proportionally higher consumption of n−3 PUFAs can protect us against inflammatory diseases, cancer, cardiovascular diseases, and other chronic diseases. The present review summarizes major sources, intake, and global consumption of n−3 and n−6 PUFAs. Their metabolism to biosynthesize long-chain PUFAs and eicosanoids and their roles in brain metabolism, cardiovascular disease, obesity, cancer, and bone health are also discussed.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Saini, Ramesh Kumar,Moon, So Hyun,Keum, Young-Soo Elsevier 2018 Food Research International Vol.108 No.-
<P><B>Abstract</B></P> <P>Globally, the amount of food processing waste has become a major concern for environmental sustainability. The valorization of these waste materials can solve the problems of its disposal. Notably, the tomato pomace and crustacean processing waste presents enormous opportunities for the extraction of commercially vital carotenoids, lycopene, and astaxanthin, which have diverse applications in the food, feed, pharmaceuticals, and cosmetic industries. Moreover, such waste can generate surplus revenue which can significantly improve the economics of food production and processing. Considering these aspects, many reports have been published on the efficient use of tomato and crustacean processing waste to recover lycopene and astaxanthin. The current review provides up-to-date information available on the chemistry of lycopene and astaxanthin, their extraction methods that use environmentally friendly green solvents to minimize the impact of toxic chemical solvents on health and environment. Future research challenges in this context are also identified.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Valorization of tomato pomace and crustacean processing waste is proposed. </LI> <LI> Processing waste present unlimited opportunities for the extraction of carotenoids. </LI> <LI> SC-CO<SUB>2</SUB> extraction is the most suitable to recover carotenoids from processing waste. </LI> <LI> Animal feed is the most prominent sector of the applications of astaxanthin. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Saini, S,Takamura, M,Mukaida, M,Kim, S.-J IEEE 2011 IEEE transactions on applied superconductivity Vol.21 No.3
<P>The <I>a</I>-axis oriented YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> thin films were grown on SrLaGaO<SUB>4</SUB> (100) substrate with a buffer layer of 50 nm thick Gd<SUB>2</SUB>CuO<SUB>4</SUB> using pulsed laser deposition technique. The thickness of Y-123 thin film was about 500 nm. Intrinsic Josephson junctions (CuO<SUB>2</SUB> planes) were aligned perpendicular to the substrate in the thin films. The bridge type pattern was fabricated using focused ion beam milling technique in such a way so that the current flow along the <I>c</I> -axis in thin film. The dimensions of bridge were 1 μm in length along the <I>c</I>-axis and 5 μm in width along the b-axis. The resistance vs. temperature characteristics showed transition temperature of about 89 K. The critical current density (J<SUB>c</SUB>) of 2×10<SUP>6</SUP> A/cm<SUP>2</SUP> was measured from current-voltage (I-V) characteristics at 10 K. The samples were irradiated with external microwave at 20 GHz and the J<SUB>c</SUB> was suppressed with increase in power. This suppression in J<SUB>c</SUB> indicates the formation of layered structure with strong coupling. The voltage steps were appeared with microwave irradiation in I-V characteristics. The values of voltage steps were irregular and change with increase in power. We have also studied all <I>a</I>-axis oriented multilayered thin films of YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> (Y123) and PrBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> (Pr123). We fabricated a submicron stack in which Josephson junctions were forming by Y123 and Pr123. The submicron stack showed response with microwave irradiation of different frequency and power. The transport characteristics of these thin films are discussed in detail.</P>
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Saini, R. K.,Keum, Y. S. Springer Science + Business Media 2017 Journal of food measurement & characterization Vol.11 No.1
<P>Bitter melon (Momordica charantia L.) is the traditional vegetable used as medicinal food, in different parts of the world, including Korea and China. Little is known about its bioactive composition aside from its health-promoting properties. Therefore, the present work aimed to determine the content of carotenoids, tocopherols, folates and fatty acids in bitter melon fruits. Using HPLC-DAD, six major carotenoids were quantified in fruits; all-E-lutein was recorded in highest quantity, followed by all-E-beta-carotene and alpha-carotene, with 79.5, 17.6 and 1.5 % of total carotenoids, respectively. A high content of alpha-tocopherol (42.93 mu g/g FW) and total folate (0.724 mu g/g FW) was also recorded in fruits using HPLC-DAD and microbiological assay, respectively. The total lipid content of 1.79 % was recorded in fresh fruits (FW). Using GC-MS, sixteen fatty acids were identified in lipid fraction; alpha-linolenic acid (ALA; C18:3) was found in highest quantity (44.33 %) followed by palmitic acid (C16:0) (29.64 %), and linoleic acid (C18:2) (10.32 %). Melon fruits contain a low amount of saturated fatty acid and high-mono and polyunsaturated fatty acids, in the form of ALA. Knowledge of bioactive composition in bitter melon fruit will be useful for proper diet recommendations and also for nutrient database updating.</P>
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Saini, K.K.,Sharma, S.D.,Chanderkant,Kar, M.,Singh, D.,Sharma, C.P. North-Holland 2007 Journal of non-crystalline solids Vol.353 No.24
Nanocrystalline thin films of titanium dioxide have been fabricated on glass and silica substrates from partially hydrolyzed precursor solution. These films were subjected to heat treatment for 1h at temperatures 100, 200, 300, 400, 500, 600, 700, 800 and 900<SUP>o</SUP>C and characterized by XRD, SEM, XPS and optical techniques. As deposited films are found to be amorphous and also contain hydroxyl and organic functional groups. Films heat treated above 100<SUP>o</SUP>C do not contain hydroxyl and organic functional groups. Microcrystalline behavior is observed in the films heat treated above 300<SUP>o</SUP>C. Crystallite size increases from ∼5 to 50nm as sintering temperature is increased from 300 to 700<SUP>o</SUP>C. Formation of anatase phase with c-axis length 7.03A is observed in the films annealed up to 700<SUP>o</SUP>C. These films peel off from the substrate beyond 700<SUP>o</SUP>C annealing temperature. Density as well as refractive index of the films increases with increase in annealing temperature up to 700<SUP>o</SUP>C. Refractive index is found to show Cauchys behavior. Transmission better than 70% is observed in the visible range. There is a strong absorption around 370nm, which is attributed to band gap absorption of the material.
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Saini, S.,Kim, S.-J. IEEE 2009 IEEE transactions on applied superconductivity Vol.19 No.3
<P>We prepared Bi<SUB>2</SUB>Sr<SUB>2</SUB>Ca<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>10+delta</SUB>(Bi-2223) single crystal whiskers from a precursor of Bi<SUB>2</SUB>Sr<SUB>2</SUB>Ca<SUB>2</SUB>Cu<SUB>2middot5</SUB>Te<SUB>0middot5</SUB>O<SUB>x</SUB> using the solid state reaction method. Te was used to enhance the growth of the whiskers. High-purity commercial powder of Bi<SUB>2</SUB>O<SUB>3</SUB>, SrCO<SUB>3</SUB>, CaCO<SUB>3</SUB>, CuO and TeO<SUB>2</SUB> were mixed and calcinated in air at 760degC to 820degC for three times. The calcinated powder was pressed into a pellet and heat treated at 880degC for 100 hours. Prior to that, the pellet was heat treated at 890degC for 15 minutes and cooled down to 880degC in 30 minutes. During the process, we used an oxygen atmosphere with a constant flow of 150 ml/min and found whiskers on the surface of the pellet. We determined that the important processing factors to grow whiskers are temperature, Te doping and the ratio of Ca and Cu. To study electrical transport characteristics, we fabricated a stack with an area of 2 mum times 2 mum and height of approximately 300 nm using focused ion beam (FIB) etching method. The stack has about two hundred of elementary junctions along the <I>c</I>-axis. A sharp and single phase transition in <I>ab</I>-plane (T<SUB>c</SUB> ap 108 K) shows high crystallinity of single crystal whiskers. Critical current density of 1 times 10<SUP>3</SUP> A/cm<SUP>2</SUP> has estimated from current (I)-voltage (V) characteristics in <I>c</I>-axis at 30 K. A well-defined superconducting gap (Vg ap 2 V) also exists in I-V characteristics, which corresponds to number of elementary Josephson junctions.</P>
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