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31.
32.
Babak Khayatzadeh Safaie Mahnaz Shamshirsaz Mohsen Bahrami 《Microsystem Technologies》2010,16(7):1081-1090
Micromachining of microelectromechanical systems such as other fabrication processes has inherent variation that leads to
uncertain dimensional and material properties. In this paper, the effect of material and feature dimension uncertainties due
to fabrication process on electrothermal microactuator tip deflection is investigated. A simple and efficient uncertainty
analysis method is used based on direct linearization method (DLM); uncertainty analysis is performed by creating second-order
metamodel through Box-Behnken design and Monte Carlo simulation. The standard deviations of tip deflection obtained by these
two probabilistic methods are very close. Simulation results have been validated by a comparison with experimental results
in literature. Experimental results fall within 95% confidence boundary obtained by DLM method. Also, sensitivity analysis
of microactuator has been explored; the results show that microactuator performance has been affected more by thermal expansion
coefficient and microactuator gap uncertainties. 相似文献
33.
Hamid Mahdavi Hamid Mirzadeh Hamed Hamishehkar Ahmad Jamshidi Amir Fakhari Jaber Emami Abdolhossien Rouholamini Najafabadi Kambiz Gilani Mohsen Minaiyan Mahnaz Najafi Maryam Tajarod Ali Nokhodchi 《应用聚合物科学杂志》2010,116(1):528-534
For the past few decades, there has been a considerable research interest in the area of biodegradable polymeric micro‐ and nanoparticles for tissue engineering, regenerative medicine, implants, stents, medical devices, and drug delivery systems. Poly(D,L ‐lactide‐co‐glycolide) (PLGA) is well‐known by its safety in biomedical preparations which has been approved for human use by the FDA. The goal of this study was to evaluate the influence of process parameters on size characteristics of PLGA microparticles prepared by oil in oil (o/o) solvent evaporation technique. This method has been introduced as one of the most appropriate methods for hydrophilic agents. Scanning electron microscopy showed that prepared particles were spherical with smooth surface without aggregation. Particle size varied from 570 nm to 29 μm in different experimental conditions. Stirring speed, polymer concentration, impeller type, and dropping size had a significant effect on the particle size. The polydispersity index of particles showed a strong relationship with the surfactant concentration, impeller type, and dropping size. It was concluded that increasing in temperature up to 50°C or changing in dropping rate has a little effect on reducing the size of PLGA particles. The residual solvent content in the final suspension was less than 0.1 ppm that is in appropriate range for biomedical application. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
34.
Taremi M Mehdi Soltan Dallal M Gachkar L MoezArdalan S Zolfagharian K Reza Zali M 《International journal of food microbiology》2006,108(3):401-403
Campylobacter spp. is a leading cause of human diarrhea. The common source of infection is contaminated food, particularly poultry. The veterinary use of antimicrobial drugs has been suggested to be largely responsible for resistance in human isolates of this zoonotic pathogen. From April to October 2004, 241 samples of chicken and beef meat for sale in retail outlets in Tehran (Iran) were analyzed for the presence of Campylobacter. Totally, 88 (36.5%) Campylobacter strains were isolated. Campylobacter was isolated from a significantly larger number of chicken (63%) than beef (10%) meat (P < 0.0001). Susceptibilities of 72 strains were determined for eight antimicrobial drugs using the disk diffusion assay. Resistance to nalidixic acid was the most common finding (75%), followed by resistance to ciprofloxacin (69.4%), tetracycline (45.8%), amoxicillin (11.1%), streptomycin (4.2%), chloramphenicol (2.8%) and gentamicin (1.4%). None of the isolates was resistant to erythromycin. Multidrug resistance was seen in 75% of the Campylobacter strains. 相似文献
35.
Nasser Nikfarjam Matineh Ghomi Tarun Agarwal Mahnaz Hassanpour Esmaeel Sharifi Danial Khorsandi Moonis Ali Khan Filippo Rossi Arianna Rossetti Ehsan Nazarzadeh Zare Navid Rabiee Davoud Afshar Massoud Vosough Tapas Kumar Maiti Virgilio Mattoli Eric Lichtfouse Franklin R. Tay Pooyan Makvandi 《Advanced functional materials》2021,31(42):2104148
Excessive and unwarranted administration of antibiotics has invigorated the evolution of multidrug-resistant microbes. There is, therefore, an urgent need for advanced active compounds. Ionic liquids with short-lived ion-pair structures are highly tunable and have diverse applications. Apart from their unique physicochemical features, the newly discovered biological activities of ionic liquids have fascinated biochemists, microbiologists, and medical scientists. In particular, their antimicrobial properties have opened new vistas in overcoming the current challenges associated with combating antibiotic-resistant pathogens. Discussions regarding ionic liquid derivatives in monomeric and polymeric forms with antimicrobial activities are presented here. The antimicrobial mechanism of ionic liquids and parameters that affect their antimicrobial activities, such as chain length, cation/anion type, cation density, and polymerization, are considered. The potential applications of ionic liquids in the biomedical arena, including regenerative medicine, biosensing, and drug/biomolecule delivery, are presented to stimulate the scientific community to further improve the antimicrobial efficacy of ionic liquids. 相似文献
36.
Hanie Hashtroudi Rajesh Kumar Raluca Savu Stanislav Moshkalev Go Kawamura Atsunori Matsuda Mahnaz Shafiei 《International Journal of Hydrogen Energy》2021,46(10):7653-7665
A novel microwave assisted two-dimensional (2D) hybrid material based on nanostructured reduced graphene oxide (rGO) doped with Pd nanoparticles (Pd/rGO) has been synthesised to investigate its hydrogen sensing performance at different operational conditions. The sensing performance has been evaluated at various operating temperatures (room temperature up to 120 °C), hydrogen concentrations (up to 1%), and relative humidity (up to ~44%). The material characterization of the hybrid Pd/rGO analysed by different techniques which confirms homogeneous distribution of Pd NPs (<35 nm) on the multi-layered porous structure of the rGO nanosheets (NSs) and forming the hybrid Pd/rGO NSs. Moreover, the fundamental hydrogen sensing mechanism as well as recovery enhancement by ultraviolet (UV) light are investigated. This work offers an environmentally friendly and energy-saving synthesis approach for hydrogen sensing with excellent control over experimental parameters which can lead to fabrication of a highly selective and sensitive hydrogen sensor. 相似文献
37.
Microsystem Technologies - In this paper a sensor based on MEMS resonators is proposed for digital microfluidics applications. The sensor system consists of a disk as active area immobilized for... 相似文献
38.
Farhadi Ladan Mohtashami Mahnaz Saeidi Jafar Azimi-nezhad Mohsen Taheri Ghadir Khojasteh-Taheri Roshanak Rezagholizade-Shirvan Alieh Shamloo Ehsan Ghasemi Ahmad 《Journal of Inorganic and Organometallic Polymers and Materials》2022,32(5):1637-1649
Journal of Inorganic and Organometallic Polymers and Materials - The production of silver nanoparticles (AgNPs) using chemical synthesis routes require hazardous and toxic solvents. Nowadays, there... 相似文献
39.
Mahnaz Saraei Raana Sarvari Bakhshali Massoumi Samira Agbolaghi 《Polymer International》2019,68(10):1795-1803
Combined therapy is a promising strategy for clinical cancer treatment with synergistic effects. The purpose of the work reported was to evaluate a smart nanocarrier for co‐delivery of doxorubicin (DOX) and methotrexate (MTX). Since star‐like nanocarriers can load a high dose of drugs with various properties, we developed star polymer nanomicelles based on poly[(2,2‐dimethylaminoethyl methacrylate)‐block‐(2‐hydroxyethyl methacrylate)‐block‐(acrylic acid)] having potential for multi‐drug delivery. The nanomicelles demonstrated high encapsulation efficiency, i.e. 97.1% for DOX and 79.5% for MTX. To this end, the star‐like terpolymers were synthesized via atom transfer radical polymerization with pentaerythritol as an initiator. The micellar properties and dual stimuli‐responsive behaviour of the terpolymers were investigated using transmission electron microscopy, field emission scanning electron microscopy and dynamic light scattering measurements, concluding that this co‐therapy offers a promising approach for cancer treatment. © 2019 Society of Chemical Industry 相似文献
40.
Emrah Dogan Mahnaz Gumrukcuoglu Mehmet Sandalci Mucahit Opan 《Engineering Applications of Artificial Intelligence》2010,23(6):961-967
Adaptive neuro-fuzzy inference system (ANFIS) models are proposed as an alternative approach of evaporation estimation for Yuvacik Dam. This study has three objectives: (1) to develop ANFIS models to estimate daily pan evaporation from measured meteorological data; (2) to compare the ANFIS model to the multiple linear regression (MLR) model; and (3) to evaluate the potential of ANFIS model. Various combinations of daily meteorological data, namely air temperature, relative humidity, solar radiation and wind speed, are used as inputs to the ANFIS so as to evaluate the degree of effect of each of these variables on daily pan evaporation. The results of the ANFIS model are compared with MLR model. Mean square error, average absolute relative error and coefficient of determination statistics are used as comparison criteria for the evaluation of the model performances. The ANFIS technique whose inputs are solar radiation, air temperature, relative humidity and wind speed, gives mean square errors of 0.181 mm, average absolute relative errors of 9.590% mm, and determination coefficient of 0.958 for Yuvacik Dam station, respectively. Based on the comparisons, it was found that the ANFIS technique could be employed successfully in modelling evaporation process from the available climatic data. 相似文献