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Using ultraviolet light in diagnosing scabies: Scabies' Sign via Wood's Lamp
No full textDiagnosing scabies relies on examinin
Towards solving linear fractional differential equations with Hermite operational matrix
No full textThis paper presents the derivation of a new operational matrix of Caputo fractional derivatives through Hermite polynomials with Tau method to solve a set of fractional differential equations (FDEs). The proposed algorithm is intended to solve linear type of FDEs with the pre-defined conditions into a matrix form for redefining the complete problem as a system of a algebraic equations.The proposed strategy is then applied to solve the simplified FDEs in linear form. To assess the performance of the proposed method, exact and approximate solutions for a number of illustrative examples are obtained which prove the effectiveness of the idea
Investigation of grip strength, pain threshold, pain tolerance and function in smartphone users
No full textPurpose/Aim of the studyFew studies have demonstrated the effects of smartphone use on grip strength and upper extremity function. The present study was purposed to compare smartphone users' grip/lateral pinch strength, pain threshold/tolerance and upper limb function.Materials and methodsA prospective cross-sectional study was conducted with 241 individuals. Participants were divided into three groups with the cut-off values of the Smartphone Addiction Scale (SAS). The Edinburgh Handedness Inventory (EHI) was used to determine the dominant side. Thumb pain threshold and tolerance were evaluated with the algometer. A hand dynamometer measured the grip and lateral pinch strength. Upper extremity functions were evaluated with the Shortened Disabilities of the Arm, Shoulder and Hand Questionnaire (Quick-DASH).ResultsHandgrip strength of the dominant/non-dominant extremities and Quick-DASH scores were higher in low-level smartphone users (p 0.05). Smartphone usage significantly affected dominant and non-dominant hand grip strength (Standardized beta(1) = -0.15, beta(2) = -0.15, p < 0.05). In addition, the smartphone use level negatively affected dominant lateral pinch strength (Standardized beta = -0.12, p = 0.05). On the other hand, smartphone use positively affected upper extremity function (Standardized beta = 0.17, p < 0.05).ConclusionsAs smartphone addiction increases, standard handgrip strength and functionality decrease. Pain threshold/tolerance is not affected by smartphone use. Future studies should focus on fine motor skills to present a more comprehensive upper limb function evaluation
Ag/La2O3/WO3 p–n heterojunction photocatalyst for clean environmental applications: degradation of oxytetracycline and H2 evaluation from formic acid
No full textIn the present study, the photocatalytic activities of nanocrystalline new silver-based (Ag) tungsten oxide (WO3) and lanthanum oxide (La2O3) materials prepared using the simple precipitation synthesis technique are studied. As a result of characterizations, the activity of the materials in both photocatalytic hydrogen production and oxytetracycline degradation was investigated. The characterizations of the synthesized materials were made by scanning electron microscope, X-ray diffraction, Raman, UV–diffuse reflectance spectroscopy (UV–DRS), electrochemical properties and X-ray photoelectron spectroscopy analyses. Morphological analyses showed that the materials were in a spherical and polygonal form, and the peaks of the characteristic components were obtained in the structural analysis. In addition, the structures of the materials were elucidated by Raman analysis supported with the X-ray diffraction results. The oxidation values of the components were obtained and compared the other characterization techniques. UV–DRS spectra analysis observed a redshift in the absorbing band edge and lower bandgap energy with 2.94 and 2.56 eV for La2O3 and WO3, respectively. In the hydrogen production reaction from formic acid, the Ag/La2O3/WO3 sample showed a higher production yield than the others. The obtained H2 production yield is 130, 140 and 230 µmol g−1 h−1 for Ag/WO3, Ag/La2O3 and Ag/La2O3/WO3, respectively. In addition, similar results were obtained in the degradation of oxytetracycline. The original part of this study presents a new perspective on which an effective photocatalytic study can be done with this; that can be easily synthesized Ag/La2O3/WO3 and can also play a role in hydrogen production. © 2023, The Author(s) under exclusive licence to Iranian Society of Environmentalists (IRSEN) and Science and Research Branch, Islamic Azad University
Problem-Solving in Science and Technology Education
No full textThis chapter focuses on problem-solving, which involves describing a problem, figuring out its root cause, locating, ranking and choosing potential solutions, as well as putting those solutions into action in science and technology education. This chapter covers (1) what problem-solving means for science and technology education; (2) what the problem-solving processes are and how these processes can be used step-by-step for effective problem-solving and (3) the use of problem-solving in citizen science projects supported by the European Union. The chapter also includes discussion of and recommendations for future scientific research in the field of science and technology education
Admission Of Patients With Severe Hypertriglyceridemia To Outpatient Clinics
No full textConference abstrac
Effect of Short Glass Fiber Reinforcement on Physical, Mechanical Properties and Fire Performance of Wood Plastic Composites
No full textAim of study: This study aimed to improve some physical, mechanical properties, and fire resistance of wood-plastic composites (WPCs) with short glass fiber reinforcement (SGFR). Materials and Methods: The WPCs were reinforced with different ratios of short glass fiber (SGF). The effect of reinforcement on the water absorption (WA), thickness swelling (TS) as physical properties, flexural strength, modulus of elasticity, and tensile strength as mechanical properties were determined. The fire resistance performance was also evaluated by the limit oxygen index (LOI) test. Main results: The reinforcement improved the physical properties. The WA and TS values decreased with increasing glass fiber content. Flexural strength increased up to 28%, while 24% for tensile strength. There was a substantial enhancement in the modulus of elasticity (up to 122%). The glass fiber reinforcement also improved the fire performance of WPCs. Highlights: The higher properties could be obtained by synthetic fiber reinforcement for WPCs.Çalışmanın amacı: Bu çalışma kısa cam lif güçlendirmesi ile odun plastik kompozitlerinin (OPK) bazı
fiziksel, mekanik özelliklerini ve yanma direncinin arttırılmasını amaçlamıştır.
Materyal ve Yöntem:OPK’lar farklı oranlarda kısa cam lifleri ile güçlendirilmiştir. Güçlendirmenin
fiziksel özellikler olarak su alma, kalınlığa şişme, mekanik özellikler olarak eğilme direnci, elastikiyet
modülü ve çekme direncine olan etkisi belirlenmiştir. Yangın direnci performansı ayrıca limit oksijen
indeksi (LOI) testi ile değerlendirilmiştir.
Sonuçlar: Güçlendirme fiziksel özellikleri iyileştirmiştir. Su alma ve kalınlığa şişme değerleri artan cam
lif içeriği ile azalmıştır. Eğilme direnci %28'e kadar yükselirken, çekme mukavemeti %24’e kadar artmıştır.
Elastikiyet modülünde önemli bir iyileşme olmuştur (~%122). Cam elyaf takviyesi ayrıca OPK’ların yangın
performansını da iyileştirmiştir.
Önemli vurgular: OPK’lar için sentetik elyaf takviyesi ile daha yüksek özellikler elde edilebili
Comparing the images formed by uses of lens surfaces
No full textIn this study, university students’ experiences with conventional and novel applications for the surfaces of biconvex and biconcave lenses were examined. This work used practical tools to depict refraction and reflection processes that occur on lens surfaces. In the main activity, the surfaces of each lens were used by the students to examine a single image created by refracted light rays and then two images created by reflected light rays. When the students compared the properties of virtual and real images, they discovered that viewing both real and virtual images at the same time is more beneficial and simulating than viewing each image type separately
Investigation of some physical and mechanical properties of wood coated with plant-oil based epoxide nanocomposite materials
No full textSome mechanical and physical properties of wood from the Oriental beech (Fagus orientalis L.) coated with bio-based epoxide amine nanocoatings were investigated in this study. Firstly, plant oil-based epoxide (ETO) was obtained from the reaction of glycidyl methacrylate (GMA) and tung oil via a Diels-Alder reaction. ETO was cured with Jeffamine D230, an aliphatic amine, and carbon nanoparticles, at a 1:1 epoxy: amine molar ratio. The wood sample was then subjected to mechanical testing of compression strength parallel to grain (CSPG) and modulus of rupture (MOR), air-dry density, oven-dry density, and water absorption (WA), as well as physical tests of those three variables. The samples coated with epoxide-amine nanocomposites had higher densities after the coating process, as evidenced by the outcomes of the air-dry and oven-dry tests. The findings of the water absorption (WA) test indicated that epoxy-coated samples outperformed control samples in terms of resistance to water absorption across the course of all water absorption periods. Increases in MOR values were seen in all epoxide-amine nanocomposites coated samples, per the MOR data. According to the CSPG findings, all epoxide-amine nanocoatings had greater than the control sample. Overall, it was determined that the plant oil-based nanocomposite resin coating technique enhanced wood material densities, decreased water absorption, and showed favourable qualities against mechanical effects
Cholinesterase, α-glucosidase, tyrosinase and urease inhibitory activities of compounds from fruits of Rinorea oblongifolia C.H. Wright (Violaceae)
No full textFrom Rinorea oblongifolia fruits, 3-Nor-4β-friedelan-24-ol (1) and 3-decyl-6,7,8-trimethoxy-2H,5H-furo[4,3,2-de]isochromene-2,5-dione (4), new derivatives alongside, 28-hydroxyfriedelan-3-one (2), friedelin (3), 3,3’,4,4’,5’-pentamethylcoruleoellagic acid (5), hexamethylcoruleoellagic acid (6), 3’,4,4’,5,5’-pentamethylcoruleoellagic acid (7), and fatty compounds 8-11 were isolated and characterized using HRESIMS, EIMS, 1D and 2D NMR. In vitro enzyme inhibition of compounds 1, 2, 4, 5, 6 and 7 were evaluated on acetylcholinesterase (AChE), butyrylcholinesterase (BChE), α-glucosidase, urease and tyrosinase. Against AChE and BChE, the phenolic compounds 4, 5, 6, and 7 had good activity probably due to the phenolic nature and methoxy substituents. Compounds 4, 5, 6 and 7 exhibited good α-glucosidase inhibition especially compound 4 whose IC50 = 42.45 ± 0.46 µg/mL was close that of acarbose (IC50 = 20.52 ± 0.84 µg/mL) standard drug. Urease and tyrosinase were appreciably inhibited by the compounds. Overall results of enzyme inhibitory assays indicate Rinorea oblongifolia, fruits and its constituents as potential remedy for enzymatic disorders