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Rectangular Microstrip Antenna with Air Cavity for High Gain and Improved Front to Back Ratio

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Journal of Electromagnetic Analysis and Applications 2011年第9期3卷 368-372页

作者： Kaushik Malakar Jaydeep Nandi Souvik Mitra prasanta kumar Gorai Sudipta Chattopadhyay Sandip Banerjee 不详

A rectangular microstrip patch antenna using conventional Poly Tetra Fluride Ethelene (PTFE) substrate with air cavity is proposed and theoretically investigated. Considerably high gain along with improved front to back radiation isolation is demonstrated using such proposed antenna. The radiation performance of this new antenna has been compared to a conventional microstrip patch for some commonly used aspect ratios (width to length ratio). Compared to conventional microstrip antenna the proposed configuration shows more than 12% increment in peak gain and more than 10% increment in front to back radiation performance in each set of aspect ratio. The elucidation of such improvement in the radiation characteristics of the proposed antenna is also presented.

关键词： Air Cavity Front to Back Radiation High Gain Microstrip Antenna

ComfoRo~——转杯纺纱线的新质量水准

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纺织导报 2007年第10期 87-88页

作者： prasanta kumar Deka Marc Schnell Jrgen Rothe Stephan Weidner-Bohnenberger

用经济的ComfoRo普梳转杯纱来生产高品质的针织品多年的北美和欧洲市场的经验证明，用ComfoRo转杯纱替代普梳环锭纱来做针织品是更经济的。最新的调查显示，在过去的几年里，这种经济性变得更加明显。

关键词：转杯纺纱线水准质量经济性欧洲市场针织品转杯纱环锭纱

Structural Inversion and Behavioural Changes as a Function of Composition in Sr-La-Al-B-Si Based Glasses

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New Journal of Glass and Ceramics 2011年第2期1卷 21-27页

作者： prasanta kumar Ojha Sangram K. Rath Tapas K. Chongdar Nitin M. Gokhale Ajit R. Kulkarni Naval Materials Research Laboratory Ambernath Thane Maharashtra India

A series of glass sealants for solid oxide fuel cell (SOFC) with compositions SrO (x wt %) La2O3 (15 wt %) Al2O3 (15 wt %) B2O3 (40-x wt %) SiO2 (30 wt %) [x = 10, 15, 20, 25 & 30] [SLABS] have been investigated by quantitative Fourier Transform Infrared Spectroscopy (FTIR). Structural findings from FTIR reveal that with increasing substitu-tion of B2O3 by SrO, even though the B2O3/SiO2 ratio decreases, however the Si-O- non-bridging bond content in the matrix is increasing and glass structure is getting more inverted. UV-Vis Diffused Reflectance Spectroscopy (UV-Vis-DRS) of the glass series shows that electrical band gap of glasses decreases in the series from 3.07eV to 2.97eV with increasing substitution from x = 10 to x = 30. Conductivities of the glass samples were measured by AC impedance spectroscopy and found to be increasing from 2.74 × 10-5 Scm-1 to 1.09 × 10-4 Scm-1 with increasing substitution from x =10 to x = 30.

关键词： Glass Ceramics Mullite Ceramics Thin Tile Composites Bending Strength

Note Microwave synthesis and pharmacological activity of Mannich base cyclohexanone derivatives

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Journal of Chinese Pharmaceutical Sciences 2010年第4期19卷 318-322页

作者： Ch. Rajveer B. Stephenrathinaraj Naveen kumar Bimal S. Sudharshini Ch. Swamalatha prasanta kumar Choudhury Department of Pharmaceutical Chemistry Vaagdevi College of Pharmacy Warangal Andhrapradesh India Department of Pharmaceutical Chemistry K.R.E's Karnataka College of PharmaCy Bidar Karnataka India Department of Pharmaceutics Royal College of Pharmacy and Health Sciences Berhampur Orissa lndia

We have synthesized mannich base cyclohexanone using microwave irradiation method,and studied their pharma-cological *** on analytical and spectral(IR,NMR and Mass) data,a number of mono as well as double mannich base cyclohexanones have been synthesized from primary and secondary amines and formaldehyde,and then purified and characterized. The required 3-aryl-2,4-diacetyl-5-hydroxy-5-methylcyclohexanone was prepared from appropriate aldehyde and acetylacetone. The synthesized compounds were screened for analgesic activity via standard approaches,and they have shown positive analgesic activity.

关键词： Mannich base Cyclohexanone Analgesic activity

Comparing Short-Term Outcomes of Right Mini-Thoracotomy and Median Sternotomy for Isolated Left Atrial Myxoma Excision

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World Journal of Cardiovascular Surgery 2024年第10期14卷 157-165页

作者： Munjerin Refat Synthee Satyajit Sharma Md. Abir Tazim Chowdhury Munama Magdum Muhit Abdullah Md. Zafar-Al-Nimari Md. Ahaduzzaman Dewan Iftakher Reza Chowdhury Saikat Dasgupta prasanta kumar Chandra Farooque Ahmed Department of Cardiac Surgery National Heart Foundation Hospital and Research Institute (NHFH&RI) Dhaka Bangladesh Department of Cardiothoracic and Vascular Surgery Evercare Hospital Dhaka Dhaka Bangladesh National Institute of Preventive and Social Medicine Dhaka Bangladesh Department of Cardiac Surgery Square Hospital Dhaka Bangladesh

Background: Left atrial myxoma (LAM) is the most common heart tumor in adults, requiring prompt surgical removal to prevent complications like valvular obstruction or embolization. Objectives: This study aimed to compare early postoperative outcomes between two surgical approaches—right mini-thoracotomy and median sternotomy—for the removal of isolated left atrial myxoma. Methods: We conducted a prospective observational study at the Department of Cardiac Surgery, National Heart Foundation Hospital & Research Institute (NHFH&RI), Mirpur, Dhaka, from March 2017 to August 2019. Twenty-eight patients undergoing surgery for isolated left atrial myxoma were included. The surgical approach was determined by the operating surgeon. We analyzed outcomes like intubation time, Intensive Care Unit (ICU) stay, pain levels (Visual Analogue Scale score), and overall hospital stay using SPSS. Statistical significance was set at p Results: Patients in the right mini-thoracotomy group had longer mean intubation times (11.43 vs. 5.93 hours, p Conclusion: Despite longer intubation and ICU times, the right mini-thoracotomy approach offers a minimally invasive alternative for isolated left atrial myxoma excision, with favorable outcomes overall.

关键词： Left Atrial Myxoma Mini-Thoracotomy Median Sternotomy Cardiac Surgery