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Статті в журналах з теми "Nd-YAG lasers Effect of noise on"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 1 лютого 2022

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1

Kibria, G., B. Doloi, and B. Bhattacharyya. "Parametric Study and Optimization of Nd: YAG Laser Micro-Turning Process of Different Grade of Alumina Ceramics Based on Taguchi Methodology." International Journal of Surface Engineering and Interdisciplinary Materials Science 2, no. 1 (January 2014): 15–46. http://dx.doi.org/10.4018/ijseims.2014010102.

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The present paper addresses an investigation on the effect of process parameters during Nd:YAG laser micro-turning operation of different grade of alumina (Al2O3) ceramic materials. Considering different levels of various process parameters i.e. laser beam average power, pulse frequency, workpiece rotational speed and Y feed rate, Taguchi method based experimental design has been used to construct the set of experiments. The same set of experiments has been utilized to machine 10 mm diameter cylindrical workpiece made of different grades of Alumina ceramics i.e. K60 and K80. Surface roughness

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2

Journal, Baghdad Science. "Study The effect of central ion to the dithene complexes on spectral shifting of saturable absorber band." Baghdad Science Journal 8, no. 2 (June 12, 2011): 465–72. http://dx.doi.org/10.21123/bsj.8.2.465-472.

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In this work dithine complexes prepared from dithiol benzil ligand and central ion to the Ni,Pd,Pt, element the ligand and complexes have been investigated using FTIR spectrophotometer and uv-vis-NIR spectral reigns show higher intensity represents the ?-?* transition in the chromopher cycle .These absorption which appear in visible and near IR spectral regions ,According to the complexes of one group ,the spectral shifting due to the change of central ion has been found to be related to atomic number of central ion .This shifting is increased while decreasing the central ion atom number These

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3

Gueorgieva, Tzvetelina G., and Raina T. Gergova. "INVESTIGATION OF ANTIBACTERIAL ACTIVITY OF ND: YAG - LASER AND STANDARD ENDODONTIC TREATMENT." Journal of IMAB - Annual Proceeding (Scientific Papers) 27, no. 2 (May 24, 2021): 3736–40. http://dx.doi.org/10.5272/jimab.2021272.3736.

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Introduction: The microbial infection is one of the main causes of the dental pulp and periodontal diseases. Previously used methods for its elimination are not fully effective, and often some microorganisms in root canals (RC) remain unaffected after treatment. Another modern method for disinfection of root canal system is laser disinfection. Different types of lasers are used - Nd: YAG, Er: YAG, Diode laser. Purpose: The purpose of our study is to compare the antibacterial activity of ND: YAG laser and conventional endodontic therapy in the treatment of infected root canals. Materials and me

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4

Dagenais, D. M., K. P. Koo, and A. Dandridge. "Demonstration of low-frequency intensity noise reduction for fiber sensors powered by diode-pumped Nd-YAG lasers." IEEE Photonics Technology Letters 4, no. 5 (May 1992): 519–20. http://dx.doi.org/10.1109/68.136507.

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5

Mohammed, Muneer Khan, Abdulrahman Al-Ahmari, and Usama Umer. "Assessment of Direct Laser Writing using Nd YAG Lasers for Microfluidic Applications." International Journal of Manufacturing, Materials, and Mechanical Engineering 5, no. 2 (April 2015): 44–58. http://dx.doi.org/10.4018/ijmmme.2015040103.

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The rapid growth in the use of Micro/Nano products in variety of industries such as Micro electromechanical systems (MEMS), microelectronics, Biomedical/Bio-MEMS, automotive (motion sensors), telecommunications etc, has demanded new micro manufacturing methods. The challenge with the manufacturing of Microfluidic devices/biochips is that they often make use of broad range of materials within a single chip, making it difficult to manufacture these devices with conventional photolithographic based techniques. Laser processing of materials has proved to be an important tool for the development of

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6

Lippert, Burkard M., and Jochen A. Werner. "Comparison of Carbon Dioxide and Neodymium: Yttrium-Aluminum-Garnet Lasers in Surgery of the Inferior Turbinate." Annals of Otology, Rhinology & Laryngology 106, no. 12 (December 1997): 1036–42. http://dx.doi.org/10.1177/000348949710601207.

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At the Department of Otorhinolaryngology—Head and Neck Surgery of the University of Kiel, 533 patients with hyperplastic inferior turbinates were treated between 1987 and 1994 with various carbon dioxide (CO2) and neodymium:yttrium-aluminum-garnet (Nd:YAG) laser techniques. We report on the therapeutic results of both types of laser turbinectomy and compare their long-term results with those of submucosal diathermy. Among the different techniques, we preferred the following approaches. The CO2 laser technique involved the application of a few laser spots (laser energy density 6,100 J/cm2 per l

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7

A.alkarem A.albaqi1, Marwan, Awatef Saber Jasem1, and Adnan Fathel A.azawai2. "The Influence of molecular Effects on Laser Nd:YAG and Diode on Trichophyton Rubrum fungi using RAPD marker." Tikrit Journal of Pure Science 24, no. 6 (November 3, 2019): 117. http://dx.doi.org/10.25130/j.v24i6.896.

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This study was carried out to assess the morphological and molecular effects of the Nd: yag and Diode (semiconductor) lasers on Trichophyton rubrum Fungi using RAPD marke . Sixty samples of skin patches, nail clippings and parts of hair were collected from infected patients of both sexes (34 males and 26 females) for the age group (1-60) year of patients who have attended to Tikrit Teaching Hospital. The T.rubrum fungi was the most common among the skin fungi, T.rubrum radiated by using two lasers: the Nd: yag laser with a wavelength (530) nm and energy (300, 500, 700) mJ and for two times exp

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8

Park, Chan, and Sang Wook Rhee. "The effect of combined application of argon and Nd-YAG lasers on iridectomy in rabbits." Korean Journal of Ophthalmology 3, no. 2 (1989): 47. http://dx.doi.org/10.3341/kjo.1989.3.2.47.

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9

Al-doori1, Aidah Abd, Awatef Saber Jasem1, and Adnan F. AL-Azzawie2. "Effects of Nd:Yag Laser on some virulence factor genes of Pseudomonas aeruginosa bacteria." Tikrit Journal of Pure Science 25, no. 2 (March 17, 2020): 86. http://dx.doi.org/10.25130/j.v25i2.962.

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The aim of this study was to assess effects of the 532nm Nd-yag laser on the genes of Tox A, Exo S, and Opr L, of Pseudomonas aeruginosa (P. aeruginosa) bacteria isolated from clinical (wounds, burns, otitis media) and environmental (water, soil) samples. Clinical samples were collected from patients coming to Saladdin General Hospital from wound, burns and middle ear infections while environmental samples were extracted from water and soil for Saladdin General Hospital . Bacterial samples irradiated by Nd-Yag laser with wavelength of 532 nm using energies (300mj,500mj) with (15 and 25 sec) an

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10

Yaniv, Eitan, Tuvia Hadar, Jacob Shvero, Rami Tamir, and Ben Nageris. "KTP/532 YAG Laser Treatment for Allergic Rhinitis." American Journal of Rhinology & Allergy 23, no. 5 (September 2009): 527–30. http://dx.doi.org/10.2500/ajra.2009.23.3346.

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Background The purpose of this study was to investigate the efficacy of the KTP/532 YAG laser to reduce nasal congestion and discharge in patients with allergic rhinitis. Methods Forty-eight patients with symptoms of allergic rhinitis were treated with the KTP/532 laser. All had positive skin tests for common allergens. Treatments were provided on an ambulatory basis in one to three sessions under local anesthesia with lidocaine nose spray. Outcome was determined by daily symptom reports and regular endoscopy examination and interviews for 12 months. Results Treatment was very well tolerated.

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11

Banerjee, Amit Jyoti, Manoja Kumar Biswal, A. K. Lohar, H. Chattopadhyay, and Naga Hanumaiah. "Review on experimental study of Nd:YAG laser beam welding, with a focus on aluminium metal matrix composites." International Journal of Engineering & Technology 5, no. 3 (August 26, 2016): 92. http://dx.doi.org/10.14419/ijet.v5i3.5984.

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The demand for high performance materials particularly in aviation and automobile industries gradually increases, CO2 and Nd: YAG lasers are becoming most popular in processing these advanced materials. In this context, one of the most important process is joining by welding. It has been a constant endeavour by researchers to explore various methods and techniques to enhance the process efficiency of autogenous Nd: YAG laser welding of various materials i.e. without any filler materials. In this work, we present a comprehensive review of major research findings for the last decades or so, obta

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12

Firoozeh, Karimi Moghadam. "Study of End Surfaces’ Deformation and Thermal Stress in Solid State Laser." Applied Mechanics and Materials 110-116 (October 2011): 4140–44. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.4140.

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High power solid state lasers have wide applications; they have extensively attracted many attentions. When laser pumped, a lot of heat produces in it causes thermal effects such as stresses end effect and variations of refraction index. In this paper, we analytically study the thermal effects in an Nd: YAG solid state laser crystal which is pumped in longitude with a second order Gaussian (super Gaussian) profile. In this survey we neglect z derivatives of temperature distribution and also consider a statement in which thermal condition of cooler system is much more than thermal condition of

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13

Mordon, S. R., A. H. Cornil, J. M. Brunetaud, B. Gosselin, and Y. Moschetto. "Nd-YAG laser thermal effect: Comparative study of coagulation in rat liver in vivo by continuous wave and high power pulsed lasers." Lasers in Medical Science 2, no. 4 (December 1987): 285–94. http://dx.doi.org/10.1007/bf02594173.

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14

Ali, Nida Hassan. "Effects of Q-switched Nd: YAG laser irradiation on the aqueous solution of human albumin and calf-thymus double strand DNA (ctds)." Iraqi Journal of Physics (IJP) 13, no. 28 (February 4, 2019): 100–105. http://dx.doi.org/10.30723/ijp.v13i28.247.

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Q-switched lasers widely used in management skin diseases andsometimes its effect may be inadequate or associated withcytotoxicity. The current study aimed to investigate the effect ofQ-switched Nd:YAG laser upon cellular elements using in vitroexperimental model. Aqueous solutions of human albumin and purecalf thymus double strand deoxyribonucleic acid (ctdsDNA)irradiated with Q-switched Nd:YAG laser at different rates (1, 3 Hz)and time exposure (up to 60 seconds) using 532 nm (400 mJ) and1064 (1200 mJ) nm wavelength with fixed spot size of 4 mm. Theeffect of laser irradiation on the albumin

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15

Rezazadeh, Fahimeh, Paria Dehghanian, and Dana Jafarpour. "Laser Effects on the Prevention and Treatment of Dentinal Hypersensitivity: A Systematic Review." Journal of Lasers in Medical Sciences 10, no. 1 (December 15, 2018): 1–11. http://dx.doi.org/10.15171/jlms.2019.01.

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Introduction: Dentinal hypersensitivity (DH) is an acute intensive tooth pain which can lead to dental annoyances during eating and drinking. Stimulating exposed dentinal tubules by either kind of thermal, tactile, chemical and/or osmotic stimuli is believed to be the cause of this pain. It is hypothesized that dentinal tubules’ orifice occlusion (DOO) can help relieve such dental irritations. Thus, this systematic review was conducted to evaluate the effectiveness of laser application as a prevention and treatment modality on DH reduction. Methods: Electronic databases (MEDLINE, SCOPUS) were

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16

Mohanty, Nalinikanta, Samir Swain, Arshad Hasan, Gyanprakash Singh, and Datteswar Hota. "Determining the correlation between transition zone index with international prostate symptom score and peak flow rate on clinical outcome after transurethral resection of the prostate in benign prostatic hyperplasia." International Surgery Journal 6, no. 12 (November 26, 2019): 4517. http://dx.doi.org/10.18203/2349-2902.isj20195423.

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Background: Benign prostatic hyperplasia (BPH) is a pathologic process which has common contribution to lower urinary tract symptoms (LUTS) in aging men. International Prostate Symptom Score (IPSS) is an important means of assesment in the clinical research of LUTS and BPH. Free flow rates (peak flow rate or Qmax) give an indirect measure for the probability of obstruction whereas subvesical obstruction only can be measured by invasive pressure-flow studies. Among the various surgical or minimally invasive techniques available for BPH like Intraprostatic stents (temporary/permanent), transuret

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17

El-Agmy, Reda M., and Najm M. Al-Hosiny. "Thermal analysis and CW laser operation at 1.998 µm in end pumped Tm:YAP lasers." Photonics Letters of Poland 11, no. 4 (December 31, 2019): 103. http://dx.doi.org/10.4302/plp.v11i4.938.

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We report on thermal analysis and a continuous wave (CW) laser operation at (1.998µm) of end pumped Tm: YAP cylindrical laser rod. The Tm: YAP laser rod is pumped at a wavelength of 1.064 µm emitting from Nd: YAG laser source. A 3W incident pump power is used to generate a maximum laser output of 700 mW, representing 18% slope efficiency. The power of thermally induced lens in Tm:YAP laser rod is numerically analyzed and validated experimentally. The focal lengths of the thermally induced lens are directly measured using Shack-Hartmann wavefront sensor. We have detected blue up-conversion fluo

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18

Tillová, Eva, and Mária Chalupová. "Unconventional Metallographic Methods for the Structural Characterization of Laser Hardened Al-Zn-Si Cast Alloy." Materials Science Forum 782 (April 2014): 369–72. http://dx.doi.org/10.4028/www.scientific.net/msf.782.369.

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The laser surface hardening is method which provides increased mechanical properties of secondary (recycled) Al-Si cast alloys for automotive industry. Improvement of mechanical properties and structure of secondary aluminium alloys can often significantly increase the lifetime of casting and reduce costs for fuel and reduction of environmental loading. For study was used a laser beam Nd: YAG lasers, BLS 720, on the test samples of secondary cast alloy AlZn10Si8Mg. AlZn10Si8Mg cast alloy are used for engine and vehicle constructions, hydraulic unit and mould making without the need of heat tre

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19

Paul, A. J., D. W. Bonnell, J. W. Hastie, P. K. Schenck, R. D. Shull, and J. J. Ritter. "In Situ Characterization of the Pulsed Laser Deposition of Magnetic Thin Films." MRS Proceedings 235 (1991). http://dx.doi.org/10.1557/proc-235-867.

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ABSTRACTPulsed Laser Deposition (PLD) has been proven as an effective means of depositing films from refractory targets. In our earlier work, either Nd/YAG or excimer lasers, interacting directly with target surfaces, were used to deposit thin films of high Tc superconductors, high dielectric constant BaTiO3 and ferroelectric PbZr0.53Ti0.47Os3 (PZT). Time-resolved molecular beam mass spectrometry and optical emission spectroscopic techniques have been developed to characterize the vapor plumes responsible for film formation. More recently, this work has been extended to the PLD of magnetic thi

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20

Paul, A. J., D. W. Bonnell, J. W. Hastie, P. K. Schenck, R. D. Shull, and J. J. Ritter. "In Situ Characterization of the Pulsed Laser DepositIon of Magnetic Thin Films." MRS Proceedings 236 (1991). http://dx.doi.org/10.1557/proc-236-455.

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AbstractPulsed Laser Deposition (PLD) has been proven as an effective means of depositing films from refractory targets. In our earlier work, either Nd/YAG or excimer lasers, interacting directly with target surfaces, were used to deposit thin films of high Tc superconductors, high dielectric constant BaTiO3 and ferroelectric PbZr0.53Ti0.47O3 (PZT). Time-resolved molecular beam mass spectrometry and optical emission spectroscopic techniques have been developed to characterize the vapor plumes responsible for film formation. More recently, this work has been extended to the PLD of magnetic thin

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