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- 저자 : Dhakal, Krishna Hari (검색결과 131 건)
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Post-peak response analysis of SFRC columns including spalling and buckling
Dhakal, Rajesh P. Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.22 No.3
Standard compression tests of steel fiber reinforced concrete (SFRC) cylinders are conducted to formulate compressive stress versus compressive strain relationship of SFRC. Axial pullout tests of SFRC specimens are also conducted to explore its tensile stress strain relationship. Cover concrete spalling and reinforcement buckling models developed originally for normal reinforced concrete are modified to extend their application to SFRC. Thus obtained monotonic material models of concrete and reinforcing bars in SFRC members are combined with unloading/reloading loops used in the cyclic models of concrete and reinforcing bars in normal reinforced concrete. The resulting path-dependent cyclic material models are then incorporated in a finite-element based fiber analysis program. The applicability of these models at member level is verified by simulating cyclic lateral loading tests of SFRC columns under constant axial compression. The analysis using the proposed SFRC models yield results that are much closer to the experimental results than the analytical results obtained using the normal reinforced concrete models are.
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Dhakal, Rajesh P.,Pan, Tso-Chien Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.23 No.2
This paper provides an insight into the response of non-seismic reinforced concrete (RC) building frames to excitations of different frequencies through experimental investigation. The results of cyclic loading tests of six full-scale RC beam-column sub-assemblies are presented. The tested specimens did not have any transverse reinforcement inside the joint core, and they were subjected to quasi-static and dynamic loading with frequencies as high as 20 Hz. Some important differences between the cyclic responses of non-seismic and ductile RC frames are highlighted. The effect of excitation frequency on the behavior of non-seismic joints is also discussed. In the quasi-static tests, shear deformation of the joint panel accounted for more than 50% of the applied story drift. The test results also showed that higher-frequency excitations are less detrimental than quasi-static cyclic loads, and non-seismic frames can withstand a higher load and a larger deformation when they are applied faster.
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Effects of spark dielectric barrier discharge plasma on water sterilization and seed germination
Dhakal Oat Bahadur,Dahal Roshani,Acharya Tirtha Raj,Lamichhane Prajwal,Gautam Sandhya,Lama Bhupendra,khanal Raju,Kaushik Nagendra Kumar,최은하,Chalise Roshan 한국물리학회 2023 Current Applied Physics Vol.54 No.-
This study investigated the effects of spark dielectric barrier discharge (SDBD) plasma on water sterilization and seed germination using an in-situ treatment method. The plasma diagnostics used I–V characteristics and optical emission spectroscopy. The electron, rotational, and vibrational temperature, as well as electron density were measured. The findings revealed that SDBD plasma treatment caused significant changes in the physicochemical properties of the liquids. In addition, the concentrations of H2O2, NO2− and NO3− were increased after 8 min of plasma treatment to 30, 40, and 100 mgL−1, respectively. The effectiveness of the SDBD plasma treatment was evaluated based on bacterial inactivation and seed germination. After 8 min of plasma treatment, an almost complete removal of E. coli and S. aureus was achieved. Furthermore, the germination of coriander seeds was enhanced when they were treated with SDBD plasma for 5 min. SDBD plasma shows promise for water sterilization, seed germination, and sustainability.
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Review of Multi-Generation Innovation Diffusion Models
DHAKAL THAKUR,Kyoung-Soon Min,Dae-Eun Lim 대한산업공학회 2019 Industrial Engineeering & Management Systems Vol.18 No.4
In recent years, innovation diffusion models and their applications are increasingly studied because of the rapid development of technology. Since the publication of Norton and Bass (1987), the models on multi-generation diffusionhave resulted in a body of articles, books, and reports. In this study, the progress of multi-generation innovation diffusion studies based on 44 research papers published from 1971 to 2018 is reviewed. Insights from different researchstreams are summarized and outlines an entry point for new researchers focusing on multi-generation innovation diffusion is provided.
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Dhakal, Rajendra,Kim, Nam-Young Hindawi Publishing Corporation 2013 The Scientific World Journal Vol.2013 No.-
<P>This paper presents a symmetric-type microstrip triple-band bandstop filter incorporating a tri-section meandered-line stepped impedance resonator (SIR). The length of each section of the meandered line is 0.16, 0.15, and 0.83 times the guided wavelength (<I>λ</I><SUB><I>g</I></SUB>), so that the filter features three stop bands at 2.59 GHz, 6.88 GHz, and 10.67 GHz, respectively. Two symmetric SIRs are employed with a microstrip transmission line to obtain wide bandwidths of 1.12, 1.34, and 0.89 GHz at the corresponding stop bands. Furthermore, an equivalent circuit model of the proposed filter is developed, and the model matches the electromagnetic simulations well. The return losses of the fabricated filter are measured to be −29.90 dB, −28.29 dB, and −26.66 dB while the insertion losses are 0.40 dB, 0.90 dB, and 1.10 dB at the respective stop bands. A drastic reduction in the size of the filter was achieved by using a simplified architecture based on a meandered-line SIR.</P>
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Enhanced production of nargenicin A(1) and generation of novel glycosylated derivatives.
Dhakal, Dipesh,Le, Tuoi Thi,Pandey, Ramesh Prasad,Jha, Amit Kumar,Gurung, RitBahadur,Parajuli, Prakash,Pokhrel, Anaya Raj,Yoo, Jin Cheol,Sohng, Jae Kyung Humana Press 2015 Applied biochemistry and biotechnology Vol.175 No.6
<P>Nargenicin A(1), an antibacterial polyketide macrolide produced by Nocardia sp. CS682, was enhanced by increasing the pool of precursors using different sources. Furthermore, by using engineered strain Nocardia sp. ACC18 and supplementation of glucose and glycerol, enhancement was similar to 7.1 fold in comparison to Nocardia sp. CS682 without supplementation of any precursors. The overproduced compound was validated by mass spectrometry and nuclear magnetic resonance analyses. The novel glycosylated derivatives of purified nargenicin A(1) were generated by efficient one-pot reaction systems in which the syntheses of uridine diphosphate (UDP)-alpha-D-glucose and UDP-alpha-D-2-deoxyglucose were modified and combined with glycosyltransferase (GT) from Bacillus licheniformis. Nargenicin A(1) 11-O-beta- D-glucopyranoside, nargenicin A(1) 18-O-beta-D-glucopyranoside, nargenicin A(1)11 18-O-beta-D- diglucopyranoside, and nargenicin 11-O-beta-D-2-deoxyglucopyranoside were generated. Nargenicin A(1) 11-O-beta-D-glucopyranoside was structurally elucidated by ultra-high performance liquid chromatography-photodiode array (UPLC-PDA) conjugated with high-resolution quantitative time-of-flight-electrospray ionization mass spectroscopy (HR-QTOF ESI-MS/MS), supported by one- and two-dimensional nuclear magnetic resonance studies, whereas other nargenicin A(1) glycosides were characterized by UPLC-PDA and HR-QTOF ESI-MS/MS analyses. The overall conversion studies indicated that the one-pot synthesis system is a highly efficient strategy for production of glycosylated derivatives of compounds like macrolides as well. Furthermore, assessment of solubility indicated that there was enhanced solubility in the case of glycoside, although a substantial increase in activity was not observed.</P>
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Dhakal, Krishna P.,Roy, Shrawan,Jang, Houk,Chen, Xiang,Yun, Won Seok,Kim, Hyunmin,Lee, JaeDong,Kim, Jeongyong,Ahn, Jong-Hyun American Chemical Society 2017 Chemistry of materials Vol.29 No.12
<P>The photocarrier relaxation between direct and indirect band gaps along the high symmetry K-Gamma line in the Brillion zone reveals interesting electronic properties of the transition metal dichalcogenides (TMDs) multilayer films. In this study, we reported on the local strain engineering and tuning of an electronic band structure of TMDs multilayer films along the K-Gamma line by artificially creating one-dimensional wrinkle structures. Significant photoluminescence (PL) intensity enhancement in conjunction with continuously tuned optical energy gaps was recorded at the high strain regions. A direct optical band gap along K-K points and an indirect optical gap along Gamma-K points measured from the PL spectra of multilayer samples monotonically decreased as the strain increased, while the indirect band gap along Lambda-Gamma was unaffected owing to the same level of local strain in the range of 0%-2%. The experimental results of band gap tuning were in agreement with the density functional theory calculation results. Local strain modified the band structure in which K-conduction band valley (CBV) was aligned below the Lambda-CBV, and this explained the observed local PL enhancement that made the material indirect via the K-Gamma transition. The study also reported experimental evidence for the funneling of photogenerated excitons toward regions of a higher strain at the top of the wrinkle geometry.</P>
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Fatty Acid Composition in each Structural Part of Soybean Seed and Sprout
Dhakal, Krishna Hari,Jeong, Yeon-Shin,Lee, Jeong-Dong,Baek, In-Youl,Ha, Tae-Joung,Hwang, Young-Hyun 한국작물학회 2009 Journal of crop science and biotechnology Vol.12 No.2
Fatty acid composition and $C_{18:2}:C_{18:3}$ of soybean seed and sprout is important for soy-industries to manufacture quality products. Six soybean varieties were analyzed by gas chromatography to determine fatty acid composition and linoleic to linolenic acid ratio ($C_{18:2}:C_{18:3}$) in seed, sprout, and their structural parts. In the case of whole seed and its structural parts, significant variation in fatty acid composition and $C_{18:2}:C_{18:3}$ were observed between varieties except palmitic acid $(C_{16:0})$, while all the parameters were significantly different for seed parts. Significant interactions of variety with seed parts were observed for oleic acid $(C_{18:1})$, $C_{18:2}$ and $C_{18:2}:C_{18:3}$. The highest saturated fatty acid, $C_{18:1}$ and polyunsaturated fatty acid were recorded in seed coat, cotyledon, and seed axis, respectively. The lowest $C_{18:2}:C_{18:3}$ was found in seed axis. In the case of sprout study, variety had significant effect on all the parameters observed for whole sprout, cotyledon, root, and except $C_{18:3}$ for hypocotyl. Culture days had significant effect on $C_{16:0}$, $C_{18:2}$ and $C_{18:3}$ in whole sprouts, while only on $C_{18:3}$ and $C_{18:2}:C_{18:3}$ in cotyledon. For hypocotyl, culture days had significant effect on $C_{18:1}$, $C_{18:2}$ and $C_{18:2}:C_{18:3}$, however, $C_{16:0}$, $C_{18:1}$, $C_{18:3}$, and $C_{18:2}:C_{18:3}$ were significantly different in root. In sprout, days and variety interacted significantly for $C_{16:0}$, $C_{18:3}$ and $C_{18:2}:C_{18:3}$, and $C_{18:1}$, $C_{18:2}$, $C_{18:3}$, and $C_{18:2}:C_{18:3}$, respectively for whole, cotyledon, and root. The significantly lowest $C_{18:2}:C_{18:3}$ (1.1) was observed in hypocotyl and root of Hwangkeumkong in 5 days. Knowledge of fatty acid composition and $C_{18:2}:C_{18:3}$ of seed, sprout, and their parts could be applicable for oil and other soy-food industries to make quality products.
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