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Ultrasensitive plasmonic sensor based on MDM waveguide containing Persian Orsi window cavities for refractive index and blood plasma sensing

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Optoelectronics Letters 2024年第7期20卷 406-411页

作者： mohammad ghanavati mohammad Azim Karami School of Electrical Engineering Iran University of Science and TechnologyTehran 16846-13114Iran12

We developed a plasmonic refractive index(RI)with a metal-dielectric-metal(MDM)structure that utilizes two Persian Orsi windows-like separated cavities with a high figure of merit(FoM)and *** simulated and optimized Ag-air-Ag MDM sensor for surface plasmon resonance(SPR)offers high RI sensitivity(SRI)and the ability to detect blood plasma concentration(BPC).The results verified that structural parameters have an effect on SRI,full width at half maximum(FWHM),FoM,sensitivity of blood plasma(S_(p))for right and left peaks,whose values are 1345.45 nm·RIU^(−1),32 nm,42.04 RIU^(−1),0.26 and 0.19 nm·L·g^(-1),*** proposed design opens a new horizon in sensor development.

关键词： index utilize MDM

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CuO-nanoparticles modified carbon paste electrode for square wave voltammetric determination of lidocaine: Comparing classical and Box–Behnken optimization methodologies

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Chinese Chemical Letters 2016年第6期27卷 837-842页

作者： Nadereh Rahbar Zahra Ramezani Jamalaldin ghanavati Nanotechnology Research Center Faculty of Pharmacy Ahvaz Jundishapur University of Medical Sciences Medicinal Chemistry Department Ahvaz Jundishapur University of Medical Sciences

In this research, copper oxide nanoparticles modified carbon paste electrode was developed for the voltammetric determination of lidocaine. The square wave voltammogram of lidocaine solution showed a well-defined peak between ＋0.5 and ＋1.5 V. Instrumental and chemical parameters influencing voltammetric response were optimized by both one at a time and Box–Behnken model of response surface methodology. The results revealed that there was no significant difference between two methods of optimization. The linear range was 1–2500 μmol L^-1（Ip= 0.11 C（LH）＋ 17.38, R^2= 0.999）. The LOD and LOQ based on three and ten times of the signal to noise（S/N） were 0.39 and 1.3 μmol L^-1（n = 10）,respectively. The precision of the method was assessed for 10 replicate square wave voltammetry（SWV）determinations each of 0.05, 0.5 and 1 μmol L^-1 of lidocaine showing relative standard deviations 4.1%,3.7% and 2.1%, respectively. The reliability of the proposed method was established by application of the method for the determination of lidocaine in two pharmaceutical preparations, namely injection and gel.

关键词： Square wave voltammetry CuO nanoparticles Lidocaine Modified carbon paste electrode

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A 5-bit time to digital converter using time to voltage conversion and integrating techniques for agricultural products analysis by Raman spectroscopy

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Information Processing in Agriculture 2014年第2期1卷 124-130页

作者： Mahdi Rezvanyvardom Tayebeh ghanavati Nejad Ebrahim Farshidi Department of Electrical Engineering Shahid Chamran University of AhvazAhvazIran

Time to digital converter(TDC)is a key block for time-gated single photon avalanche diode(SPAD)arrays for Raman spectroscopy that applicable in the agricultural products and food *** this paper a new dual slope time to digital converter that employs the time to voltage conversion and integrating techniques for digitizing the time interval input signals is *** reference clock frequency of the TDC is 100 MHz and the input range is theoretically *** proposed converter features high accuracy,very small average error and high linear *** this converter has some advantages such as low circuit complexity,low power consumption and low sensitive to the temperature,power supply and process changes(PVT)compared with the time to digital converters that used preceding conversion *** proposed converter uses an indirect time to digital conversion ***,our converter has the appropriate linearity without extra *** order to evaluate the proposed idea,an integrating time to digital converter is designed in 0.18 lm CMOS technology and was simulated by *** of the theoretical and simulation results confirms the proposed TDC operation;therefore,the proposed converter is very convenient for applications which have average speed and low variations in the signal amplitude such as biomedical signals.

关键词： Time to digital converter(TDC) Time to voltage converter(TVC) Indirect conversion TDCs Dual slope analog to digital converter Raman spectroscopy

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Nutrient patterns and risk of cataract：a case-control study

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International Journal of Ophthalmology(English edition) 2017年第4期10卷 586-592页

作者： Fatemeh Sedaghat Matin ghanavati Parisa Nezhad Hajian Sara Hajishirazi Mehdi Ehteshami Bahram Rashidkhani Department of Community Nutrition Faculty of Nutrition Sciences and Food TechnologyNational Nutrition and Food Technology Research Institute (WHO Collaborating Center)Shahid Beheshti University of Medical Sciences

AIM：To assess the relation between nutrient patterns and cataract ***：This is a hospital-based case-control study with 97 cataract patients and 198 matched *** consumption was collected through a valid food frequency questionnaire（FFQ）.Nutrient patterns were detected by applying factor *** logistic regression models were used to estimate odds ratio（ORs） and 95%***：We extracted 5 main nutrient *** 1 included niacin,thiamin,carbohydrates,protein,zinc,vitamin B6 and sodium（sodium pattern）.Factor 2 was characterized by oleic acid,monounsaturated fats,polyunsaturated fats,linoleic acid,trans fatty acid,linolenic acid,vitamin E and saturated fats（fatty acid pattern）.The third factor represented high intake of vitamin B12,vitamin D,cholesterol and calcium（mixed pattern）.The 4^（th） pattern was high in intake of beta and alpha carotene,vitamin A and vitamin C（antioxidant pattern）.Finally,the 5^（th） pattern loaded heavily on docosahexaenoic acid（DHA） and eicosapentaenoic acid（EPA）（omega-3 pattern）.In crude and multivariate analysis,the sodium pattern was associated with increased risk of cataract（OR=1.97,95%CI：1.09-3.96）.The fatty acid pattern elevated the risk of cataract（OR=1.94,95%CI：1.1-3.86）.Antioxidant pattern was associated with a significant 79% reduced risk（2^（nd） category compared with the 1st）.Omega-3 pattern was significantly negatively associated with risk of cataract（P=0.04）.CONCLUSION：These findings imply that nutrient patterns reflecting a combined consumption of nutrients might be important in the etiology of *** studies with more efficient designs are warranted to confirm our findings.

关键词： nutrient patterns cataract case-control study

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Antimicrobial activity of multipurpose essential oil blends

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Health 2012年第8期4卷 443-447页

作者： Harold Edward Laubach Simone Hobus ghanavati Geraldine Whidden College of Medical Sciences Nova Southeastern University Fort Lauderdale USA Inhalable SolutionsTM Boca Raton USA Natures Symphony Boca Raton USA

Two types of multipurpose essential oil blends, blend11 containing eleven different essential oils and blend12 containing twelve, were tested against bacterial strains of Pseudomonas aeruginosa ATCC 9027, Serratia marcescens ATCC 13880 and Staphylococcus aureus ATCC 6538 and against the fungi, Candida albicans ATCC 10231, Aspergillus fumigatus ATCC 10894 and Fusarium solani ATCC 36031 to determine the spectrum of in vitro antimicrobial activity using aromatograms (paper disc diffusion assays). Microbial growth was decreased by multipurpose blend11 and blend12 in a similar manner. The saline control disc did not inhibit antimicrobial growth while the two blends exhibited significant zones of inhibition for all 3 bacteria and for the 3 fungi. The greatest antibacterial activity of blend11 and blend12 was exhibited with P. aeruginosa and S. marcescens followed by S. aureus. A high level of activity was associated with C. albicans and a lower level with F. solani followed by A. fumigatus. It is clearly evident from previous published studies that no single essential oil will effectively inhibit the growth of all of the organisms in our study. However, our results demonstrate that blend11 and blend12 have a broad range of inhibitory activity affecting all of the microorganisms tested.

关键词： Aromatic Essential Oils Antimicrobial Activity

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SUBBAND-BASED CONVOLUTIVE BLIND SOURCE SEPARATION WITH PRE-DESIGNED DATA WHITENING FILTERS

SUBBAND-BASED CONVOLUTIVE BLIND SOURCE SEPARATION WITH PRE-D...

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2010 4th International Conference on Intelligent Information Technology Application (IITA2010)

作者： Ebrahim ghanavati Hamid Sheikhzadeh Kamraan Raahemifar Amin Kheradmand Department of Electrical Engineering Amirkabir University of Technology Tehran Department of Electrical and Computer Engineering Ryerson University Toronto

ISBN: (纸本)9781424484669

Convolutive blind source separation is considered in this *** by the drawbacks of time-domain and frequency-domain approaches,the problem is reformulated in the subband-domain.A well-known time-domain algorithm is improved and implemented in subband-domain using a new pre-emphasis method in the *** algorithm is based on the entropy maximization principle and uses the natural gradient algorithm（NGA） for efficient *** experiments verify the excellent performance of the proposed method in terms of convergence rate,reduction of artifacts and the separation performance.

关键词： Blind source separation convolutive mixtures subband processing pre-emphasis filtering.

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Antimicrobial activity of multipurpose essential oil blends

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Health 2012年第8期

作者： Harold Edward Laubach Simone Hobus ghanavati Geraldine Whidden

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