Autor: Lee, C. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Valorization of Cobalt from Waste LIB Cathode through Cobalt Oxalate and Cobalt Oxide Synthesis by Leaching-Solvent Extract-Precipitation Stripping
Autorzy:: Swain, B.
Lee, J.-C.
Lee, C.-G.
Powiązania:: https://bibliotekanauki.pl/articles/352333.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: valorization of cobalt
cobalt oxide powder
rod-shaped cobalt oxalate
precipitation stripping
Opis:: An ecoefficient, economical and sustainable valorization process for the synthesis of Co₃O₄ from waste lithium-ion battery (LIB) by leaching-solvent extract-scrubbing-precipitation stripping route has been developed. Through an optimization, the waste LIB cathode was leached using 2000 mole/m³ of H₂SO₄ and 5 Vol. % of the H₂O₂ at a pulp density of 100 kg/m³ under leaching time 60 minutes and temperature 75°C. From the separated leach liquor, cobalt was purified by saponified Cyanex 272. From cobalt, loaded Cyanex 272 impurities were scrubbed and the CoC₂O₄·2H₂O was recovered through precipitation stripping. Finally, the precipitate was calcined to synthesize Co₃O₄, which is a precursor for LIB cathode materials manufacturing. From TGA-DTA, followed by XRD analysis it was confirmed that at 200°C the CoC₂O₄·2H₂O can be converted to anhydrous CoC₂O₄ and at 350°C the anhydrous can be converted to Co₃O₄ and at 1100°C the Co₃O₄ can be converted to CoO. Through reported route waste LIB can back to LIB manufacturing process through a versatile and flexible industrial approach.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 2; 1037-1042
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Cardiac Autonomic Control during Alternate Nostril Breathing in Subjects Novice to Yoga Practice
Autorzy:: Ghiya, Shreya
Lee, C. Matthew
Powiązania:: https://bibliotekanauki.pl/articles/1167049.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Alternate nostril breathing
Anulom-Vilom breathing
Pranayama
Slow breathing
Yoga
Opis:: Objectives: To examine heart rate variability during alternate nostril breathing (ANB) in a group of individuals novice to yoga practice and to compare the effects of ANB to that of paced breathing (PB) at the same respiratory rate. Design: The study involved randomized repeated measures of two different breathing patterns. Participants: Twenty healthy individuals (22.3 ± 2.9 years) participated. Intervention: Subjects were asked to rest for 5 minutes (PRE-ANB and PRE-PB) before they participated in two different breathing exercises (ANB and PB) in a random order for 30 min. Outcome Measures: Heart rate (HR), mean arterial pressure (MAP) and heart rate variability (HRV) were measured during PRE-ANB, PRE-PB, ANB, and PB and compared using analysis of variance. HRV was reported as frequency and time domain parameters. Total power (TP; 0.0-0.4 Hz), low- (LF; 0.04-0.15 Hz), and high-frequency (HF; 0.15-0.40 Hz) ranges were selected and were natural log (ln) transformed. Time domain variables such as RMSSD, pNN50, and SDNN were also reported. Results: There was a main effect of breathing condition on HR and MAP (p < 0.05 for both) such that HR was higher during PRE-ANB and ANB compared to PRE-PB and PB and that MAP was greater during ANB compared to the other conditions. There were main effects of time on lnTP, lnLF, and lnHF (p < 0.001 for all) such that lnTP and lnLF were greater and lnHF was lower during ANB and PB compared to the PRE conditions. There was a breathing x time interaction on lnLF/lnHF (p <0.05) such that it was greater during PB compared to ANB and that it was greater during ANB and PB compared to PRE-ANB and PRE-PB. There was a main effect of breathing on pNN50 such as that it was lower during Pre ANB and ANB. There was also a main effect of time on SDNN such that it was higher during PB and ANB. No significant changes were noted in RMSSD measurements during any conditions. Conclusions: During both ANB and PB, there was a decrease in parasympathetic and/or increase sympathetic control of the heart. Additionally, ANB may result in less of a reduction in parasympathetic control than PB.
Źródło:: World Scientific News; 2018, 105; 134-144
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A Study Of The Die Roll Height Of SHP-1 And SCP-1 Materials In The Fine Blanking Process
Badanie wysokości deformacji krawędzi wycinanych elementów ze stali SHP-1 i SCP-1 procesie wykrawania
Autorzy:: Lee, C. K.
Kim, Y. C.
Powiązania:: https://bibliotekanauki.pl/articles/356499.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: die roll
fine blanking
SCP-1
share speed
SHP-1
v-rings
krawędzie
wykrawanie
szybkość działania
deformacja
Opis:: The height of the die roll, the distance of the V-ring, and the shear rate were varied with the aim of investigating the effects of the applied changes on the fine blanking line in a cold-rolled and a pickled steel sheet, referred to as SCP-1 and SHP-1, respectively. Both materials consisted primarily of a ferrite phase with small amounts of impurities including F, Mn, and Cr. The distance was found to be a very important factor in controlling the shear of the V-ring in the fine blanking process. When the position of the V-ring was set at distances of 1.5 mm and 2 mm, the die roll height increased with increasing shear speeds from 6.4 m/min to 10 and 16 m/min. Analysis of the influence of the shear rate revealed that low rates resulted in the lowest die roll heights since the flow of material was effectively inhibited.
Źródło:: Archives of Metallurgy and Materials; 2015, 60, 2B; 1397-1402
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Development of Carbon Nanotube Based Reflection Type X-ray Source
Autorzy:: Choi, H.
Kim, J.
Lee, C.
Powiązania:: https://bibliotekanauki.pl/articles/1807922.pdf
Data publikacji:: 2009-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.47.Lx
75.47.Gk
73.50.Fq
Opis:: X-ray imaging technology is a useful and leading medical diagnostic tool for health care professionals to diagnose disease in human body. Carbon nanotube based X-ray source, which we have developed in this study, could be also useful and supply integrated diagnostic X-ray imaging tool in diagnosis. Conventionally, thermionic type of tungsten filament X-ray tube is widely employed in the field of biomedical and industrial application fields. However, intrinsic problems, such as poor emission efficiency, low imaging resolution, and high electrical energy consumption etc., may cause the limitation of using the X-ray tube. To fulfill the current market requirement, specifically for medical diagnostic field, we have developed rather a portable and compact carbon nanotube based X-ray device in which microfocus high imaging resolution can be feasible.
Źródło:: Acta Physica Polonica A; 2009, 115, 6; 1078-1080
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A Study on the Optimal Design of Air Pockets in an Air Bearing Applied Tilting Index Table
Autorzy:: Lee, M.-J
Lee, C.-M
Powiązania:: https://bibliotekanauki.pl/articles/971152.pdf
Data publikacji:: 2009
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: optimal design
tilting index table
air bearing
air pocket
Opis:: The tilting index table has attached to CNC machining center with 3axes, it can be improvement of its performance and its machining efficiency. The tilting index table is a key unit in order to manufacture some non-rotational and 3-dimensional parts, using the conventional machining center. The tilting index table is directly connected to a processing object. Regarding the increase in the deflection of the table, it directly affects processing objects and increases errors and that makes impossible to obtain desired processing precision. Thus, this study performed the shape optimization of air pockets in order to minimize the deflection presented in the existing table. In the numerical optimizing method for implementing optimal design, the general full factorial design and response surface method in the design of experiments were used. A finite element analysis was used for computational experiments in which the finite element analysis was performed by using the ANSYS Workbench, which is a type of commercial FEM tool. In addition, the analysis of the results was performed by using the commercial program, Minitab 15. The results show that the optimum design results is better than those of the initial design.
Źródło:: Journal of Machine Engineering; 2009, 9, 2; 114-123
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Safety Management in a Relationship-Oriented Culture
Autorzy:: Hsu, S. H.
Lee, C. C.
Powiązania:: https://bibliotekanauki.pl/articles/91057.pdf
Data publikacji:: 2012
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: safety management
safety climate
relationship-oriented culture
high-risk industry
safety culture
Opis:: A relationship-oriented culture predominates in the Greater China region, where it is more important than in Western countries. Some characteristics of this culture influence strongly the organizational structure and interactions among members in an organization. This study aimed to explore the possible influence of relationships on safety management in relationship-oriented cultures. We hypothesized that organizational factors (management involvement and harmonious relationships) within a relationship-oriented culture would influence supervisory work (ongoing monitoring and task instructions), the reporting system (selective reporting), and teamwork (team communication and co-ordination) in safety management at a group level, which would in turn influence individual reliance complacency, risk awareness, and practices. We distributed a safety climate questionnaire to the employees of Taiwanese high-risk industries. The results of structural equation modeling supported the hypothesis. This article also discusses the findings and implications for safety improvement in countries with a relationship-oriented culture.
Źródło:: International Journal of Occupational Safety and Ergonomics; 2012, 18, 1; 35-45
1080-3548
Pojawia się w:: International Journal of Occupational Safety and Ergonomics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: A Study on Changes in Thickness of STS304 Material in the Progressive Drawing Process
Autorzy:: Lee, C. K.
Kim, Y. C.
Powiązania:: https://bibliotekanauki.pl/articles/356710.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: body thickness
drawing
flange thickness
corner roundness
material thickness
Opis:: In the drawing process, the roundness of corners in the punch and the die are very important factors in determining the thicknesses of the product. The results clearly revealed that the thickness of a flange was increased and the thickness of body parts reduced when the roundness of the die entrance was small. The material thickness of the top part was decreased when the corner roundness of the punch was large. The smooth inflow of materials was found to have a significant effect on the thickness during the post-process. The compressive strength of STS 304 material exhibited a higher value compared with other processing methods. Moreover, we clearly observed the corner roundness of the punch and the die to be a very important factor for STS 304 materials.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 2B; 1319-1323
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Enhancement of Drilling Safety and Quality Using Online Sensors and Artificial Neural Networks
Autorzy:: Liu, T.- I.
Kumagai, A.
Lee, C.
Powiązania:: https://bibliotekanauki.pl/articles/90529.pdf
Data publikacji:: 2003
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: drilling safety
online sensors
artificial neural networks
bezpieczeństwo pracy
ocena ryzyka zawodowego
wiertnictwo
sieci neuronowe
Opis:: Cutting force sensors and neural networks have been used for the occupational safety of the drilling process. The drill conditions have been online classified into 3 categories: safe, caution, and danger. This approach can change the drill just before its failure. The inputs to neural networks include drill size, feed rate, spindle speed, and features that were extracted from drilling force measure-ments. The outputs indicate the safety states. This detection system can reach a success rate of over 95%. Furthermore, the one misclassification during online tests was a one-step ahead pre-alarm that is acceptable from the safety and quality viewpoint. The developed online detection system is very robust and can be used in very complex manufacturing environments.
Źródło:: International Journal of Occupational Safety and Ergonomics; 2003, 9, 1; 37-56
1080-3548
Pojawia się w:: International Journal of Occupational Safety and Ergonomics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Late Ordovician trilobites from the Xiazhen Formation in Zhuzhai, Jiangxi Province, China
Autorzy:: Lee, D.-C.
Powiązania:: https://bibliotekanauki.pl/articles/20075.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:: Trilobites from mudstone of the Upper Ordovician Xiazhen Formation of South China are described. The reef−associated, unique fauna comprises 25 species, 14 genera, and ten families. Five new species are named: Remopleurides xiazhenensis sp. nov., Hibbertia aodiensissp. nov., Vietnamia yushanensissp. nov., Ceraurinus zhuzhaiensissp. nov., and Pliomerina tashanensis sp. nov. The paucity of trilobites in reef−associated carbonates is interpreted that the trilobites diversified after the reef system decimated. Compared to the Late Ordovician trilobite faunas in other areas of South China, the Xiazhen mudstone fauna is unique in that the phacopids including Vietnamia, Ceraurinus, and Pliomerina account for 75% of the specimens collected. The occurrence of the same trilobite assemblage at different sampling localities along the dip direction of the formation suggests that the outcrops may be overlapped due to structural movement. The Xiazhen trilobite fauna is unique among the Late Ordovician fauna in that it is predominated by phacopids and associated with reef.
Źródło:: Acta Palaeontologica Polonica; 2013, 58, 4
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: A study on the development of a new grinding processes for high-lead ball screw nuts
Autorzy:: Choi, Ch.
Ha, Y.
Kim, H.
Lee, C.
Powiązania:: https://bibliotekanauki.pl/articles/99599.pdf
Data publikacji:: 2010
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: high-lead ball screw nuts
new grinding process
surface roughness
Opis:: This paper proposes a method that machines the race of high-lead ball screw nuts, which is difficult to machine using the existing geometrical machining method, without any interferences and changes in its load rating in order to perform the high-speed in ball screws. This study calculates the inclination angle of the axis of the grinding stone for avoiding the contact of the axis to the inner diamete of the nut and determines the shape of the grinding stone through changing the inclination angle and dressing curvature determined in a dressing device Then, the grinding condition will be determined by measuring the shape meter of the screw race for solving the problem. Also, the surface roughness of the grinded surface was measured using a surface roughness tester, and check with applying a grinding process of product not being high-lead ball screw.
Źródło:: Journal of Machine Engineering; 2010, 10, 1; 50-57
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Synthesis, Structure, Photoluminescence, and Raman Spectrum of Indium Oxide Nanowires
Autorzy:: Kim, H.
Na, H.
Yang, J.
Lee,, C.
Powiązania:: https://bibliotekanauki.pl/articles/1505485.pdf
Data publikacji:: 2011-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.07.-b
78.55.-m
Opis:: Production of indium oxide $(In_2O_3)$ whiskers at a very low temperature of 650°C was reported. The synthetic route was comprised of a thermal heating process of a mixture of In and Mg powders. We have investigated the structural properties of the as-synthesized nanowires by using X-ray diffraction and scanning electron microscopy. The product consisted of one-dimensional nanowires, with a crystalline cubic structure of $In_2O_3$. The photoluminescence measurement with the Gaussian fitting exhibited visible light emission bands centered at 2.1 eV and 2.8 eV. The peaks of the Raman spectrum were indexed to the modes being associated with cubic $In_2O_3$.
Źródło:: Acta Physica Polonica A; 2011, 119, 2; 143-145
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Rapid Synthesis of Gold Nano-Particles Using Pulse Waved Potential in a Non-Aqueous Electrolyte
Autorzy:: Jang, J. G.
Lee, J.-O.
Lee, C. K.
Powiązania:: https://bibliotekanauki.pl/articles/352529.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: gold
nanoparticle
nonaqueous electrolyte
pulse wave
catalyst
Opis:: Rapid synthesis of gold nanoparticles (AuNPs) by pulsed electrodeposition was investigated in the non-aqueous electrolyte, 1-ethyl-3-methyl-imidazoliumbis(trifluoro- methanesulfonyl)imide ([EMIM]TFSI) with gold trichloride (AuCl₃). To aid the dissolution of AuCl₃, 1-ethyl-3-methyl-imidazolium chloride ([EMIM]Cl) was used as a supporting electrolyte in [EMIM]TFSI. Cyclicvoltammetry experiments revealed a cathodic reaction corresponding to the reduction of gold at −0.4 V vs. Pt-QRE. To confirmthe electrodeposition process, potentiostatic electrodeposition of gold in the non-aqueous electrolyte was conducted at −0.4 V for 1 h at room temperature. To synthesize AuNPs, pulsed electrodeposition was conducted with controlled duty factor, pulse duration, and overpotential. The composition, particle-size distribution, and morphology of the AuNPs were confirmed by field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The electrodeposited AuNPs were uniformly distributed on the platinum electrode surface without any impurities arising from the non-aqueous electrolyte. The size distribution of AuNPs could be also controlled by the electrodeposition conditions.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 2B; 1389-1392
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: An Experimental Study on the Determination of Optimal Lubrication Conditions in a High-Speed Spindle
Autorzy:: Park, S.-J.
Hwang, Y.-K
Lee, C.-M
Powiązania:: https://bibliotekanauki.pl/articles/971161.pdf
Data publikacji:: 2009
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: optimal lubrication condition
oil-air lubrication
high speed spindle
Opis:: The heat generation inside spindles becomes a major factor that limits the allowable maximum rotational speed in machine tools and decreases the cutting quality. It is necessary to accurately estimate the temperature distribution in spindles caused by the heat generation in bearings and its heat transfer characteristics in order to perform the high-speed and high-precision in high-speed spindles. In addition, an accurate correction process is required according to the results of the estimation through investigating the thermal deformation error. A commercial program, MINITAB, was used to establish an experiment plan that analyzes the heat generation characteristics of the spindle system according to the operation and lubrication conditions of the spindle. Also, the change in the outer ring temperature of bearings was measured according to the experimental plan. After establishing a response surface model using the results of the experiment, the estimation equation of the quadratic polynomial model was proposed for determining the optimal lubrication condition. A verification experiment was applied to verify the accuracy of the experimental equation determined by the estimated regression model and the experimental value used in the estimation of the regression model.
Źródło:: Journal of Machine Engineering; 2009, 9, 2; 106-113
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: On the monitoring system of collision risks among multiple ships
Autorzy:: Son, N. S.
Kim, S. Y.
Lee, C. S.
Powiązania:: https://bibliotekanauki.pl/articles/320903.pdf
Data publikacji:: 2012
Wydawca:: Polskie Forum Nawigacyjne
Tematy:: collision risk among multiple ships
Opis:: To reduce crewmembers’ error and increase the safety of ships’ navigation, a recognition system of collision risks among multiple ships is newly-developed. By using ships’ navigational information such as AIS data, an algorithm to calculate collision risks among multiple ships is newly-designed. Collision risks of multiple ships can be estimated considering ships’ position and course of now and future by using fuzzy algorithm. To evaluate the performance of new system, replay simulation is carried out by using actual AIS data of actual collision accident in Korea. In this paper, main features of the monitoring system of collision risks and the results of replay simulation are discussed.
Źródło:: Annual of Navigation; 2012, No. 19, part 1; 149-163
1640-8632
Pojawia się w:: Annual of Navigation
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Effect of Surfactant Addition on Bi2Te3 Nanostructures Synthesized by Hydrothermal Method
Autorzy:: Dharmaiah, P.
Lee, C. H.
Madavali, B.
Hong, S.-J.
Powiązania:: https://bibliotekanauki.pl/articles/351609.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: bismuth telluride
hydrothermal synthesis
spark plasma sintering
thermoelectric materials
X-ray diffraction
Opis:: In the present work, we have prepared Bi₂Te₃ nanostructures with different morphologies such as nano-spherical, nanoplates and nanoflakes obtained using various surfactant additions (EG, PVP, and EDTA) by a hydrothermal method. The shape of the nanoparticles can be controlled by addition of surfactants. The samples were characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). It is found that the minority BiOCl phase disappears after maintained pH at 10 with EG as surfactant. SEM bulk microstructure reveals that the sample consists of fine and coarse grains. Temperature dependence of thermoelectric properties of the nanostructured bulk sample was investigated in the range of 300-450K. The presence of nanograins in the bulk sample exhibits a reduction of thermal conductivity and less effect on electrical conductivity. As a result, a figure of merit of the sintered bulk sample reached 0.2 at 400 K. A maximum micro Vickers hardness of 102 Hv was obtained for the nanostructured sample, which was higher than the other reported results.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 2B; 1005-1010
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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