检索结果-南通市图书馆

Er_(2)TiO_(5)@Ag nanocomposites:Enhanced photocatalysis and bacteria inactivation,and cytotoxicity

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第5期42卷 851-858,I0002页

作者： Mehdi Nazeri hossein Sedaghat Reza Rafiei Mohammad Amin Farzin seyed Mostafa hosseinpour Mashkani Department of Parasitology and Mycology Kashan University of Medical SciencesKashanIran Department of Microbiology Kashan University of Medical SciencesKashanIran General Medicine Student School of MedicineKashan University of Medical SciencesKashanIran Student Research Committee Kashan University of Medical SciencesKashanIran Institute for Biomedical Materials and Devices School of Mathematical and Physical SciencesFaculty of ScienceUniversity of Technology SydneyNSW2007Australia

In this study,we successfully synthesized Er_(2)TiO_(5)@Ag nanocomposites(NCPs) using the ultrasonicmediated sol-gel technique to create a multifunctional material with enhanced photocatalytic and antibacterial *** visible light photocatalytic activities of Er_(2)TiO_(5) nanoparticles(NPs) and Er_(2)TiO_(5)@Ag NCPs were systematically evaluated under various conditions,including different concentrations of Basic Blue 41(BB 41) dye and *** results reveal a remarkable improvement in the photocatalytic degradation efficiency of Er_(2)TiO_(5)@Ag NCPs(95%) compared to Er_(2)TiO_(5) NPs(80%).Furthermore,the antibacterial efficacy of Er_(2)TiO_(5) NPs and Er2TiO_5@Ag NCPs were extensively examined against Gram-positive and Gram-negative ***,Er_(2)TiO_(5)@Ag NCPs exhibit significantly higher minimum bactericidal concentration(MBC) values compared to Er_(2)TiO_(5) *** antibacterial effect of Er_(2)TiO_(5)@Ag NCPs is particularly pronounced against *** and Pseudomonas aeruginosa,while demonstrating moderate effects on Escherichia coli and Enterococcus *** assess the biocompatibility of the synthesized materials,we investigated their internalization by MCF-7 ***,both Er_(2)TiO_(5) NPs and Er_(2)TiO_(5)@Ag NCPs are found to be effectively internalized by the cells,suggesting their potential application in biomedical ***,our study unveils the exceptional potential of Er_(2)TiO_(5)@Ag NCPs as a dual-action solution,simultaneously possessing enhanced photocatalytic efficiency and potent antibacterial *** multifunctional nanocomposite not only outperforms Er_(2)TiO_(5) and Ag but also paves the way for innovative applications in sustainable environmental remediation and advanced biomedical technologies,promising a brighter and cleaner future.

关键词： Rare earth catalysis Nanocomposite Er_(2)TiO_(5)@Ag Antibacterial activity Photocatalysis Cytotoxicity

Interactive effects of drought stress and chitosan application on physiological characteristics and essential oil yield of Thymus daenensis Celak

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2017年第5期5卷 407-415页

作者： Zohreh Emami Bistgani seyed Ataollah Siadat Abdolmehdi Bakhshandeh Abdollah Ghasemi Pirbalouti Masoud hashemi Ramin Agriculture and Natural Resources University of Khozestan Department of Medicinal Plants Shahrekord Branch Islamic Azad University Stockbridge School of Agriculture University of Massachusetts Amherst Amherst

Thymus daenensis, a perennial herb, is often grown in areas that experience drought conditions during its growing period. Application of chitosan may compensate for the negative impact of drought stress on the yield of oil and secondary metabolites in *** interactive effects of foliar application of chitosan and drought stress on dry matter,essential oil yield, and selected physiological characteristics including photosynthetic pigments, osmotic adjustment, and lipid peroxidation of Thymus were investigated in a two-year study from 2014 to 2015. Treatments consisted of 0, 200, and 400(iL L'1 chitosan applied to plants grown under field capacity, mild drought stress(50% field capacity), and severe drought stress(25% field capacity). Dry matter yield decreased substantially as drought stress intensified. However, essential oil content increased under stress conditions,with the highest essential oil yield obtained from plants under mild drought stress. Foliar application of chitosan compensated to some extent for dry matter and oil yield reduction of plants grown under drought stress. The highest essential oil yield(1.52 g plant-1) was obtained by application of 400 \iL L_1 chitosan under the mild stress condition in 2015 when plants were mature. The compensatory effect of chitosan in reducing the negative impact of stress conditions on dry matter and oil yield was due mainly to stimulation of osmotic adjustment through proline accumulation and reduction of lipid peroxidase level, which increased the integrity of cell membranes of thyme leaves.

关键词： Thymus daenensis Chitosan Drought stress Essential oil yield Osmotic adjustment

Effect of performed operations management on the amount of sediment production in natural forests

在线全文

学校读者我要写书评

暂无评论

Forestry Studies in China 2013年第3期15卷 214-221页

作者： seyed Armin hashemi Alireza ESLAMI Sahar TABIBIAN Department of Forestry Lahijan Branch Islamic Azad University Department of Agriculture Rasht Branch Islamic Azad University Department of Agriculture and Natural Resources Payamenoor University

The present study on the sediment production in natural forests was carried out on an 13,284 ha area,ocated in Guilan Province, in the north of Iran. This area is under intensive management. We first analyzed the physi- sal factors of the area. Then, the amount of road construction, afforestation and harvested wood volume, as well as the harvesting method in the region were determined for the years between 1993 and 2010. The results show that the aver- age annual amount of sediment production in the entire region, over this 18-year period, has increased annually at a rate of 3.54 ***-2 （R2 = 0.56） at a confidence level of 95%. Operations management and management methods used in ：his forest area has affected the amount of sediment production. Clear cutting and extensive harvesting methods in the region caused an increase in the amount of sediment production, as indicated by a coefficient of determination of 0.71, mplying that forest management may be considered effective and in harmony with the environment.

关键词： afforestation sediment forest road construction harvesting

Land cover mapping of deciduous forest regions using ETM+ data: a case study of Azerbaijan Province, Iran

在线全文

学校读者我要写书评

暂无评论

Forestry Studies in China 2011年第4期13卷 299-302页

作者： seyed Armin hashemi Mir Mozaffar FALLAHCHAI Department of Forestry Lahijan Branch Islamic Azad University

Up to date information about the existing land cover patterns and changes in land cover over time is one of the prime prerequisites for the preparation of an integrated development plan and economic development program of a region. By using ETM＋ image data from 2002, we provided a land cover map of deciduous forest regions in Azerbaijan Province, Iran. Initial qualitative evaluation of the data showed no significant radiometric errors. Image classification was carried out using a maximum likelihood-based supervised classification method. In the end, we determined five major land cover classes, i.e., grass lands, deciduous broad-leaf forest, cultivated land, river and land without vegetation cover. Accuracy, estimated by the use of criteria such as overall accuracy from a confusion matrix of classification was 86% with a 0.88 Kappa coefficient. Such high accuracy results demonstrate that the combined use of spectral and textural characteristics increased the number of classes in the field classification, also with excellent accuracy. The availability and use of time series of remote sensing data permit the detection and quantification of land cover changes and improve our understanding of the past and present status of forest ecosystems.

关键词： land cover deciduous forest regions ETM+ data classification accuracy

The morphological variations of Culex pipiens(Diptera:Culicidae) in central Iran

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2011年第3期4卷 215-219页

作者： hossein Dehghan Javid Sadraei seyed Hassan Moosa-Kazemi Department of Medical Entomology and Parasitology School of Medical SciencesTarbiat Modares UniversityTehranIran Department of Medical Entomology and Vector Control School of Public HealthTehran University of Medical ScienceTehranIran

Objective:To determine the variations in morphological characters of Culex pipiens complex and identify the species ***:A study was carried out from April to October 2009 in Yazd Province,*** study was performed in two randomly selected rural villages in Yazd County using different sampling methods such as larval collection,hand catch,pyrethrum space spray,light trap,and pit shelter *** data were analyzed using SPSS software Ver. *** and Tukey’s post-hoc test was used to compare the ratios of the ***: The average of the DV/D ration was 0.090±0.007 and the range was *** average D/V ratio was 1.07±0.02,with maximum 1.6 and minimum *** costa and subcosta intersection were observed beyond the bifurcation of R2+3 in most of the *** bifurcations of R2+3 and M1+3 veins were not on one direction in all *** range of the R-Ceh7R2+3 ratio was *** average ratio of cross wing was 2.25±0.04 with a range of ***: More populations of Culex pipiens from different areas of Iran need to be studied to gain complete information about the taxonomy and ecology of the species.

关键词： Culex pipiens complex Females Male genitalia Taxonomy

Collar performance in bridge pier scour with debris accumulation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2022年第3期37卷 328-334页

作者： hossein Hamidifar seyed Mohammad Bagher Shahabi-Haghighi Yee Meng Chiew Water Engineering Department Shiraz University School of Civil and Environmental Engineering Nanyang Technological University

The mechanism of bridge pier scour becomes more complex in the presence of debris accumulation upstream of the pier. While using countermeasures may be effective in reducing scour, their efficacy could be undermined in such a situation. The current study investigates the effectiveness of using a collar in the presence of different types of floating debris accumulation in reducing scour around a cylindrical bridge pier with non-cohesive bed sediment. The experimental results reveal that using a collar can reduce the scour depth by up to 39% when compared to that without the collar in the absence of debris accumulation under the same flow conditions. Also, the collar’s efficiency is reduced by up to 25% when debris accumulation is present. However, depending on the relative size of the accumulated debris and collar, the effectiveness of collars may be increased as a pier-scour protection device. A new parameter,which is defined as the Debris Protrusion Ratio(DPR), is used to quantify the effect of debris layout size on scour depth. Moreover, a semi-empirical equation that may be used to predict the depth of the scour hole that forms around cylindrical collar-fitted piers with floating debris accumulation is proposed. The equation’s performance is evaluated using the available data in the literature. Based on the analysis, the current study shows that the accuracy of the proposed equation is satisfactory in predicting the maximum scour depth.

关键词： Bridge pier Scour Debris Collar Blockage

New approach for assessing the weldability of precipitation-strengthened nickel-base superalloys

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2013年第12期20卷 1183-1191页

作者： Homam Naffakh Moosavy Mohammad-Reza Aboutalebi seyed hossein seyedein Meisam Khodabakhshi Carlo Mapelli School of Metallurgy and Materials Engineering Iran University of Science and Technology (IUST) MAPNA Turbine Engineering and Manufacturing Company (TUGA) Dipartimento di Meccanica Politecnico di Milano

A new procedure was proposed for evaluating the weldability of nickel-base superalloys. The theory is on the basis of two microstructural patterns. In pattern I, the weld microstructure exhibits severe alloying segregation, many low-melting eutectic structures, and low weldability. The weld requires a weaker etchant and a shorter time for etching. In pattern Ⅱ, the weld microstructure displays less alloying segregation, low quantity of eutectic structures, and high weldability. The weld needs a stronger etchant and a longer time for etching. Five superalloys containing different amounts of Nb and Ti were designed to verify the patterns. After welding operations, the welds were etched by four etchants with different corrosivities. The weldability was determined by TG-DSC measurements. The metallography and weldability results confirmed the theoretic patterns. Finally, the etchant corrosivity and etching time were proposed as new criteria to evaluate the weldability of nickel-base superalloys.

关键词： superalloys nickel alloys weldability metallography etching segregution eutectics

Presentation of massive orbital hidrocystoma at birth:case report and review of the literature

在线全文

学校读者我要写书评

暂无评论

Eye and Vision 2017年第1期4卷 22-25页

作者： Bahram Eshraghi Mohammad-Ali Abtahi seyed Ali Sonbolastan Zahra Kasaie seyed-hossein Abtahi Ophthalmology Department School of MedicineTehran University of Medical SciencesTehranIran Ophthalmology Department School of MedicineIsfahan University of Medical SciencesIsfahanIran Isfahan Eye Research Center Isfahan University of Medical SciencesFeiz HospitalQods Sq.IsfahanIran Pathology Department School of MedicineIsfahan University of Medical SciencesIsfahanIran

Background:Hidrocystoma,or sudoriferous cyst,is an eyelid tumor originating from apocrine or eccrine sweat *** presence in the orbit is relatively *** presentation:A full-term female child with severe right eye extrusion was referred to our department two hours after *** performed cyst aspiration under ultrasonic guidance;15 cc straw-colored fluid was obtained and proptosis resolved *** magnetic resonance imaging(MRI)showed a large unilocular retrobulbar mass with hypo-intensity in T1 and hyper-intensity in *** case underwent further daily ocular assessment until day 5;when proptosis began to worsen *** day 6,under general anesthesia,we performed aspiration and then the cyst was completely removed with an intact wall through a trans-conjunctival *** diameter of the aspirated cyst was about 4 *** pathologic consultation,a cystic cavity lined by a layer of sweat duct like epithelium with apical snouts consistent with the diagnosis of apocrine hidrocystoma was ***:To date,in the literature,six other cases of orbital hidrocystoma have been reported in childhood with protean clinical pictures;none of which presented at ***,we introduce the first case report at birth and also provide a review on the *** report strongly argues against the well reputed theory of traumatic origin for orbital hidrocystoma;it has been postulated that this tumor may be the result of sweat gland cells implantation through the *** thereby suggest the possible presence of choristomatous ectopic sweat gland cells in the orbit during embryogenesis.

关键词： Orbital hidrocystoma Pediatric orbital tumor Sudoriferous cyst

3D-Printed MOF Monoliths:Fabrication Strategies and Environmental Applications

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第12期16卷 358-405页

作者： hossein Molavi Kamyar Mirzaei Mahdi Barjasteh seyed Yahya Rahnamaee Somayeh Saeedi Aliakbar Hassanpouryouzband Mashallah Rezakazemi Department of Chemistry Institute for Advanced Studies in Basic Science(IASBS)Zanjan 45137-66731Iran Department of Chemical and Biological Engineering University at BuffaloThe State University of New YorkBuffaloNY 14260USA Center for Nano-Science and Nanotechnology Institute for Convergence Science&TechnologySharif University of TechnologyTehran 15614Iran Department of Biomedical Engineering Amirkabir University of Technology(Tehran Polytechnic)Hafez Ave.P.O.Box 15875-4413TehranIran Grant Institute School of GeosciencesUniversity of EdinburghWest Main RoadEdinburgh EH93FEUK Faculty of Chemical and Materials Engineering Shahrood University of TechnologyShahroodP.O.Box ***Iran

Metal-organic frameworks(MOFs)have been extensively considered as one of the most promising types of porous and crystalline organic-inorganic materials,thanks to their large specific surface area,high porosity,tailorable structures and compositions,diverse functionalities,and well-controlled pore/size ***,most developed MOFs are in powder forms,which still have some technical challenges,including abrasion,dustiness,low packing densities,clogging,mass/heat transfer limitation,environmental pollution,and mechanical instability during the packing process,that restrict their applicability in industrial ***,in recent years,attention has focused on techniques to convert MOF powders into macroscopic materials like beads,membranes,monoliths,gel/sponges,and nanofibers to overcome these ***-dimensional(3D)printing technology has achieved much interest because it can produce many high-resolution macroscopic frameworks with complex shapes and geometries from digital ***,this review summarizes the combination of different 3D printing strategies with MOFs and MOF-based materials for fabricating 3D-printed MOF monoliths and their environmental applications,emphasizing water treatment and gas adsorption/separation ***,the various strategies for the fabrication of 3D-printed MOF monoliths,such as direct ink writing,seed-assisted in-situ growth,coordination replication from solid precursors,matrix incorporation,selective laser sintering,and digital light processing,are described with the relevant ***,future directions and challenges of 3D-printed MOF monoliths are also presented to better plan future trajectories in the shaping of MOF materials with improved control over the structure,composition,and textural properties of 3D-printed MOF monoliths.

关键词： MOFs 3D-printing Environmental remediation Shaping Monoliths