http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Sivagami, I. Nirmal,Prasanna, K.,Santhoshkumar, P.,Jo, Yong Nam,Kang, Suk Hyun,Kim, Tae Hong,Lee, Chang Woo American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.11
<P>A novel lithium transition metal orthosilicate compound, i.e., lithium zinc silicate (Li2ZnSiO4), is investigated as a potential cathode material for lithium ion batteries(LIBs). Li2ZnSiO4 is successfully synthesized via a facile sol-gel technique followed by a calcination step. The studied physical and electrochemical properties substantiate the Li2ZnSiO4 compound to be considered as a potential positive electrode in LIBs. The X-ray diffraction (XRD) results reveal an orthorhombic structure of Li2ZnSiO4 with sharp crystalline peaks. Field emission transmission electron microscopy (FE-TEM) images show a plate-like structure of a single particle with clear lattice fringes. The mapping results of FE-TEM along with X-ray photoelectron spectroscopy (XPS) confirm the chemical composition of Li2ZnSiO4 crystals. Field emission scanning electron microscopy (FE-SEM) further confirms the FE-TEM results on the morphology of Li2ZnSiO4 with a plate-like structure and an average particle size of 5 mu m. Electrochemical impedance spectroscopy (EIS) studies shows an initial charge transfer resistance (R-ct) of 371 Omega. An initial discharge capacity of 133 mAh g(-1) is obtained at the C/10 rate, which is comparable to other orthosilicate compounds.</P>
Cost Effective Image Classification Using Distributions of Multiple Features
Vanitha Sivagami Sivasankaravel 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.7
Our work addresses the issues associated with usage of the semantic features by Bag of Words model, which requires construction of the dictionary. Extracting the relevant features and clustering them into code book or dictionary is computationally intensive and requires large storage area. Hence we propose to use a simple distribution of multiple shape based features, which is a mixture of gradients, radius and slope angles requiring very less computational cost and storage requirements but can serve as an equivalent image representative. The experimental work conducted on PASCAL VOC 2007 dataset exhibits marginally closer performance in terms of accuracy with the Bag of Word model using Self Organizing Map for clustering and very significant computational gain.
Santhoshkumar, P.,Prasanna, K.,Jo, Yong Nam,Sivagami, I. Nirmal,Kang, Suk Hyun,Lee, Chang Woo The Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.32
<▼1><P>In the present work, we have synthesized zero-dimensional (0D) and three-dimensional (3D) iron oxide (α-Fe2O3) sub-micron particles using a one-pot hydrothermal approach.</P></▼1><▼2><P>In the present work, we have synthesized zero-dimensional (0D) and three-dimensional (3D) iron oxide (α-Fe2O3) sub-micron particles using a one-pot hydrothermal approach. Morphological studies reveal that the as-synthesized spherical α-Fe2O3 (SFO) material consists of nanospheres with void spaces. The prepared SFO delivers a high specific surface area of 100.80 m<SUP>2</SUP> g<SUP>−1</SUP> and significantly increases the contact area between the electrode and the electrolyte. The initial galvanostatic specific capacity of the SFO materials was 1306 mA h g<SUP>−1</SUP> at a current density of 100 mA g<SUP>−1</SUP>, which is superior to that of bare cubic α-Fe2O3 (CFO). Moreover, the mesoporous SFO shows a good cycling stability with a capacity retention rate of 91.4% after 100 cycles. These attractive results suggest that the mesoporous SFO shows a good electrochemical performance as a negative electrode material for high-performance Li-ion batteries.</P></▼2>
Kang, Suk Hyun,Jo, Yong Nam,Prasanna, K.,Kim, Tae Hong,Do, Su Jung,Santhoshkumar, P.,Sivagami, I. Nirmal,Lee, Chang Woo American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.11
<P>Herein, different amount of CuO are onto Li[Ni0.8Co0.1Mn0.1]O-2 (NCM811) cathode active materials and characterized using X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), and field emission-transmission electron microscopy (FE-TEM). A 2 wt.% CuO-coated NCM811 material has an obviously enhanced electrochemical behavior compared with the NCM811 material. In addition, the 2 wt.% CuO-coated NCM811 has the highest capacity retention values of 82.4 and 63.9% in current density of 150 and 200 mA g(-1), respectively. The capacity retention of pristine NCM811 material is 84.1%, whereas that of 2 wt.% CuO-coated NCM811 material is 90.4% after 80 cycles at 60 degrees C. According to electrochemical impedance spectra (EIS), the film resistance and the charge transfer resistance of CuO-coated material are lower than those of pristine NCM811. The reason behind the enhanced electrochemical behaviors of CuO-coated material is that the CuO prevents a direct contact of the cathode active material with electrolyte, suppressing a side reaction between the cathode material and unwanted-byproduct hydrofluoric (HF) acid.</P>