Influence of compression ratio on combustion characteristics of a VCR engine using Calophyllum inophyllum biodiesel and diesel blends

Swarup Kumar Nayak,Santosh Kumar Nayak,Purna Chandra Mishra,Srinibas Tripathy 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.9

The standard configuration parameters of a Variable compression ratio (VCR) engine neglect to give specific execution with biodieselfrom distinctive origins. Alongside, a bunch of exploration of diversified biodiesel over performance and emission analysis, extremelyconstrained work has been taken out on combustion analysis with VCR. This survey was performed to identify the impact of compressionratio on the combustion characteristics of a diesel engine fueled with Calophyllum inophyllum oil methyl ester (COME) and itsblends with diesel. Experiments were conducted at a fixed speed of 1500 RPM, full load and at different compression ratios of 16:1, 17:1and 18:1. Results, revealed that combustion duration of Calophyllum inophyllum oil was more, while the ignition delay period was shorterthan that of diesel.

Upconversion Nanoparticles as a Contrast Agent for In Vivo Photoacoustic Imaging

( Swarup Kumar Maji ),( Sivaramapanicker Sreejith ),( James Joseph ),( Manjing Lin ),( Tingchao He ),( Yan Tong ),( Handong Sun ),( Sidney Wing-kwong Yu ),( Yanli Zhao ),김동하 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

Lanthanide doped upconversion nanomaterials have proven their great potentiality in modern biological applications, however, tracing UC materials from tissue depths still remains challenging due to visible emission, increased optical extinction in biological tissues and luminescence quenching in aqueous/biological conditions, which further limits their optical resolution in vivo. In this work, we report the use of NaYF4:Yb3+,Er3+ UC materials for in vivo photoacoustic imaging (PAI) by making use of hitherto unexplored luminescence quenching effect of UC materials in water. We observed a significant luminescence quenching effect of UC-α-CD in water upon 980 nm excitation. The observed non-radiative relaxation enhances thermal conductivity and subsequent PA signal of UC-α-CD in water. PAI properties of UC-α-CD were then investigated, and its application for in vivo high resolution PAI at 980 nm was demonstrated in live mice and thus proved as an excellent candidate for in vivo PAI.

Optical Absorption in Quantum Dot Solar Cell

Swarup Biswas(비스와스 스와럽),Yong-Ju Lee(이용주),Bo-Yeon Lee(이보연),Hyeong-Won Lee(이형원),Hyeok Kim(김혁) 대한전기학회 2020 대한전기학회 학술대회 논문집 Vol.2020 No.7

Strawberry Plant Wetness Detection Using Color and Thermal Imaging

Swarup Anushka,이원석,Peres Natalia,Fraisse Clyde 한국농업기계학회 2020 바이오시스템공학 Vol.45 No.4

Purpose Leaf wetness is the presence of free water on the surface of a crop canopy. It is mainly caused due to factors such as rainfall, dew, and irrigation. The duration for which water is present on the crop surface is called the leaf wetness duration (LWD). The relationship between leaf wetness and plant disease has been studied for centuries. It has been found that the rate of infection is directly linked to the temperature of plants during the wet periods. Thus, it is imperative to detect and monitor the presence of water on the plant surface. Methods Currently, the most popular solution for this purpose is to use electronic leaf wetness sensors which are difficult to calibrate and are not user friendly. This research aimed at detecting leaf wetness in strawberry plants using noninvasive optical methods such as color and thermal imaging. Results It was found that color imaging yielded good classification results for differentiating between wet and dry leaf surfaces. However, its dependence on illumination conditions was a drawback. Thermal imaging proved to be useful when using highresolution cameras for water droplet detection but was dependent on ambient weather conditions. Conclusion The results suggested that fusing color and thermal imaging technologies could compensate for the drawbacks present when using these technologies individually and could prove to be potent in detecting leaf wetness.

Growth of Time-Dependent Strain in Reinforced Cement Concrete and Pre-stressed Concrete Flexural Members

Swarup Rn. Debbarma,Showmen Saha 한국콘크리트학회 2012 International Journal of Concrete Structures and M Vol.6 No.2

This paper presents the differences in growth of time-dependent strain values in reinforced cement concrete (RCC) and pre-stressed concrete (PSC) flexural members through experiment. It was observed that at any particular age, the time-dependent strain values were less in RCC beams than in PSC beams of identical size and grade of concrete. Variables considered in the study were percentage area of reinforcement, span of members for RCC beams and eccentricity of applied pre-stress force for PSC beams. In RCC beams the time-dependent strain values increases with reduction in percentage area of reinforcement and in PSC beams eccentricity directly influences the growth of time-dependent strain. With increase in age, a non-uniform strain develops across the depth of beams which influence the growth of concave curvature in RCC beams and convex curvature in PSC beams. The experimentally obtained strain values were compared with predicted strain values of similar size and grade of plane concrete (PC) beam using ACI 318 Model Code and found more than RCC beams but less than PSC beams.

Micropower energy harvesting using high-efficiency indoor organic photovoltaics for self-powered sensor systems

( Swarup Biswas ),( Yongju Lee ),( Hyeok Kim ) 한국센서학회 2021 센서학회지 Vol.30 No.6

We developed a highly efficient organic photovoltaic (OPV) cell with a poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5- b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)]:[6,6]-phenyl-C71-butyric acid methyl ester active layer for harvesting lower-intensity indoor light energy to power various self-powered sensor systems that require power in the microwatt range. In order to achieve higher power conversion efficiency (PCE), we first optimized the thickness of the active layer of the OPV cell through optical simulations. Next, we fabricated an OPV cell with optimized active layer thickness. The device exhibited a PCE of 12.23%, open circuit voltage of 0.66 V, short-circuit current density of 97.7 μA/㎠, and fill factor of 60.53%. Furthermore, the device showed a maximum power density of 45 μW/㎠, which is suitable for powering a low-power (microwatt range) sensor system.

Preparation of antimicrobial and antioxidant gelatin/curcumin composite films for active food packaging application

Roy, Swarup,Rhim, Jong-Whan Elsevier 2020 Colloids and surfaces. B, Biointerfaces Vol.188 No.-

<P><B>Abstract</B></P> <P>The functional gelatin/curcumin composite film was prepared using an emulsifier, sodium dodecyl sulfate (SDS). The composite films were characterized using field emission scanning electron microscopy (FE-SEM) and Fourier transform infrared spectroscopy (FTIR). The FE-SEM test results showed that curcumin was evenly distributed in the gelatin polymer matrix to form a flexible composite film with a smooth surface. The addition of 1.5 % of curcumin improved the UV blocking effect by more than 99 % at a loss of 5.7 % of transparency compared to neat gelatin films. The addition of curcumin (up to 1 wt%) significantly improved mechanical and water vapor barrier properties. Also, the gelatin/curcumin composite films exhibited remarkable antimicrobial activity against foodborne pathogenic bacteria, <I>E. coli</I> and <I>L. monocytogenes</I>, and showed strong antioxidant activity comparable to ascorbic acid. Antibacterial and antioxidant gelatin/curcumin composite films with improved UV protection, water vapor barrier and mechanical properties have high potential in active food packaging applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Gelatin/curcumin composite films were prepared using a surfactant, SDS. </LI> <LI> Curcumin was evenly distributed without aggregation in the polymer matrix. </LI> <LI> The addition of curcumin improved mechanical and water vapor barrier property. </LI> <LI> Curcumin provided UV-barrier property without sacrificing transparency of gelatin film. </LI> <LI> Gelatin/curcumin composite films exhibited remarkable antibacterial and antioxidant activities. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Growth of Time-Dependent Strain in Reinforced Cement Concrete and Pre-stressed Concrete Flexural Members

Debbarma, Swarup Rn.,Saha, Showmen Korea Concrete Institute 2012 International Journal of Concrete Structures and M Vol.6 No.2

This paper presents the differences in growth of time-dependent strain values in reinforced cement concrete (RCC) and pre-stressed concrete (PSC) flexural members through experiment. It was observed that at any particular age, the time-dependent strain values were less in RCC beams than in PSC beams of identical size and grade of concrete. Variables considered in the study were percentage area of reinforcement, span of members for RCC beams and eccentricity of applied pre-stress force for PSC beams. In RCC beams the time-dependent strain values increases with reduction in percentage area of reinforcement and in PSC beams eccentricity directly influences the growth of time-dependent strain. With increase in age, a non-uniform strain develops across the depth of beams which influence the growth of concave curvature in RCC beams and convex curvature in PSC beams. The experimentally obtained strain values were compared with predicted strain values of similar size and grade of plane concrete (PC) beam using ACI 318 Model Code and found more than RCC beams but less than PSC beams.

Melanin-mediated synthesis of silver nanoparticle and its use for the preparation of carrageenan-based antibacterial films

Roy, Swarup,Shankar, Shiv,Rhim, Jong-Whan Elsevier 2019 Food hydrocolloids Vol.88 No.-

<P><B>Abstract</B></P> <P>Silver nanoparticles (AgNP) were synthesized by a green method using melanin (Mel) as a reducing and capping agent and incorporated to carrageenan (Carr) to prepare antimicrobial nanocomposite films. The optimal reaction condition for the synthesis of AgNP was 1 mM AgNO<SUB>3</SUB> with 10 mg Mel/100 mL 0.1 M KOH at 100 °C for 1 h. The formed AgNP was spherical with a diameter of 10–50 nm and exhibited a light absorption peak at 410 nm. X-ray diffraction (XRD) peaks revealed the characteristic of crystalline AgNP. AgNP also showed strong antibacterial activity against food-borne pathogenic bacteria, <I>Escherichia coli</I> and <I>Listeria monocytogenes</I>. The incorporation of AgNP to Carr produced uniform films as observed from a field emission scanning electron microscope (FE-SEM). The addition of AgNP not only affected the color of the film surface but also significantly improved the UV shielding properties of nanocomposite films. The incorporation of AgNP reduced the water contact angle and water vapor barrier properties while increasing the thermal stability, mechanical strength and resilience of the Carr films. The Carr/AgNP nanocomposite films showed strong antibacterial activity against <I>E. coli</I> and <I>L. monocytogenes</I>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> AgNP were synthesized using melanin as a reducing and capping agent. </LI> <LI> Carrageenan/AgNP composite films were prepared. </LI> <LI> Thermal stability and mechanical strength of carrageenan films increased by the addition of AgNP. </LI> <LI> Carrageenan/AgNP composite films showed strong antibacterial activity against food-borne pathogens. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Synthesis and Charge Transport of Polymer Nanocomposite of Polyaniline: Polystyrene Sulfonate

Biswas, Swarup,Jeong, Hyeon-Seok,Jeong, Jae-Bum,Cho, Boram,Lee, Suwoong,Lee, Dong-Wook,Lang, Philippe,Bae, Jin-Hyuk,Kim, Hyeok American Scientific Publishers 2019 Journal of nanoscience and nanotechnology Vol.19 No.8