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RISS 인기검색어
- 검색키워드
- 저자 : Muhammad Waqar AHMED (검색결과 9 건)
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Muhammad Waqar Ahmed,Md. Shahinur Rahman,최수석,Ulugbek Shaislamov,양종근,Rai Suresh,이헌주 한국진공학회 2017 Applied Science and Convergence Technology Vol.26 No.5
The scope of this work is to determine and compare the effect of electron temperature (Te) and number density (Ne) on the yield rate and concentration of reactive chemical species (•OH, H2O2 and O3) in an argon, air and oxygen injected negative DC (0-4 kV) capillary discharge with water flow(0.1 L/min). The discharge was created between tungsten pin-to pin electrodes (Φ = 0.5 mm) separated by a variable distance (1-2 mm) in a quartz capillary tube (2 mm inner diameter, 4 mm outer diameter), with various gas injection rates (100-800 sccm). Optical emission spectroscopy (OES) of the hydrogen Balmer lines was carried out to investigate the line shapes and intensities as functions of the discharge parameters such as the type of gas, gas injection rate and inter electrode gap distances. The intensity ratio method was used to calculate Te and Stark broadening of Balmer β lines was adopted to determine Ne. The effects of Te and Ne on the reactive chemical species formation were evaluated and presented. The enhancement in yield rate of reactive chemical species was revealed at the higher electron temperature, higher gas injection rates, higher discharge power and larger inter-electrode gap. The discharge with oxygen injection was the most effective one for increasing the reactive chemical species concentration. The formation of reactive chemical species was shown more directly related to Te than Ne in a flowing water gas injected negative DC capillary discharge.
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Underwater Capillary Discharge with Air and Oxygen Addition
Muhammad Waqar Ahmed,양종근,Young-Sun Mok,이헌주,유영훈 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.9
The aim of this work was to present an effective method of generating an underwater capillarydischarge at low power through gas injection (O2, air) and generating OH radicals. A flowingwater (0.1 L/min) discharge was created in a quartz capillary tube (Φ = 4 mm outer; Φ = 2mm inner; thickness = 2 mm) by applying a continuous negative DC voltage (0 − 4 kV) acrosstungsten electrodes (Φ = 0.5 mm) separated by a variable distance (1 − 2 mm) in the pin-pinelectrode configuration. The air- and oxygen-injected capillary discharges at a constant water flowrate, similar gas injection variation rates, and two different interelectrode gaps were compared. Areduction in the breakdown voltage with increasing gas injection rate was shown. Compared toair, oxygen was proven to be more effective for generating an underwater discharge of a pulsatingnature with the characteristics of high energy per pulse, higher power per pulse, short pulse width,and short pulse repetition rate. The emission spectrum of the oxygen-injected discharge showed ahigher concentration of OH radicals than that of the air-injected discharge. The imaging diagnosticresults showed that the discharge was brighter and more expanded when oxygen was added than itwas when air was added.
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Ahmed, Muhammad Waqar,Rahman, Md. Shahinur,Choi, Sooseok,Shaislamov, Ulugbek,Yang, Jong-Keun,Suresh, Rai,Lee, Heon-Ju The Korean Vacuum Society 2017 Applied Science and Convergence Technology Vol.26 No.5
The scope of this work is to determine and compare the effect of electron temperature ($T_e$) and number density ($N_e$) on the yield rate and concentration of reactive chemical species ($^{\bullet}OH$, $H_2O_2$ and $O_3$) in an argon, air and oxygen injected negative DC (0-4 kV) capillary discharge with water flow(0.1 L/min). The discharge was created between tungsten pin-to pin electrodes (${\Phi}=0.5mm$) separated by a variable distance (1-2 mm) in a quartz capillary tube (2 mm inner diameter, 4 mm outer diameter), with various gas injection rates (100-800 sccm). Optical emission spectroscopy (OES) of the hydrogen Balmer lines was carried out to investigate the line shapes and intensities as functions of the discharge parameters such as the type of gas, gas injection rate and inter electrode gap distances. The intensity ratio method was used to calculate $T_e$ and Stark broadening of Balmer ${\beta}$ lines was adopted to determine $N_e$. The effects of $T_e$ and $N_e$ on the reactive chemical species formation were evaluated and presented. The enhancement in yield rate of reactive chemical species was revealed at the higher electron temperature, higher gas injection rates, higher discharge power and larger inter-electrode gap. The discharge with oxygen injection was the most effective one for increasing the reactive chemical species concentration. The formation of reactive chemical species was shown more directly related to $T_e$ than $N_e$ in a flowing water gas injected negative DC capillary discharge.
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Multi-type Image Noise Classification by Using Deep Learning
Waqar Ahmed,Zahid Hussain Khand,Sajid Khan,Ghulam Mujtaba,Muhammad Asif Khan,Ahmad Waqas International Journal of Computer ScienceNetwork S 2024 International journal of computer science and netw Vol.24 No.7
Image noise classification is a classical problem in the field of image processing, machine learning, deep learning and computer vision. In this paper, image noise classification is performed using deep learning. Keras deep learning library of TensorFlow is used for this purpose. 6900 images images are selected from the Kaggle database for the classification purpose. Dataset for labeled noisy images of multiple type was generated with the help of Matlab from a dataset of non-noisy images. Labeled dataset comprised of Salt & Pepper, Gaussian and Sinusoidal noise. Different training and tests sets were partitioned to train and test the model for image classification. In deep neural networks CNN (Convolutional Neural Network) is used due to its in-depth and hidden patterns and features learning in the images to be classified. This deep learning of features and patterns in images make CNN outperform the other classical methods in many classification problems.
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Stimulatory effects of needling and plasma on collagen synthesis in SKH-1 hairless mice
Yang, Jongkeun,So, Sangjae,Premkumar, Natraj,Ahn, Meejung,Rai, Suresh,Shaislamov, Ulugbek,Ahmed, Muhammad Waqar,Han, Chang-Hoon,Lee, Heonju IOP 2019 Journal of Physics. D, Applied Physics Vol.52 No.21
<P>In this study, we demonstrate an effective skin therapy device based on the plasma generated nitric oxide (NO) and needling techniques. The NO generator was constructed based on the dielectric barrier discharge plasma and combined with a commercial needling device. As a result, continueous flow of the NO could be supplied during needling treatment procedure. Several input voltages were investigated to generate plasma and study the optimum concentration of the generated NO. Furthermore, the synergetic effect of the NO exposure and needling technique to the collagen generation on the skin was analysed by both histological and gene expression methods on SKH-1 mice. Based on the histological examination, the samples treated with plasma showed an increased subcutaneous collagen density, and this effect was enhanced with a higher depth of needling. The differential gene expression of the Col4a5 gene was increased more than 100 times in the samples treated with a longer exposure of needling and plasma regardless of the depth. The results suggest that both needling and plasma treatment have a synergistic effect on the production of collagen which might be due mainly to the increased expression of the Col4a5 gene in the dorsal skin of SKH-1 mice.</P>
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