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Parametric relationship between hypoid gear teeth and accurate face-milling cutter

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Advances in Manufacturing 2020年第4期8卷 537-555页

作者： mahmoud Rababah Muhammad Wasif syed Amir Iqbal Department of Mechanical Engineering Hashemite UniversityZarqaJordan Department of Industrial and Manufacturing Engineering NED University of Engineering and TechnologyKarachiPakistan

The cutter systems of hypoid gear cutting machines contain groups of inside and outside *** these cutter systems,the side cutting edges of the blades machine the convex and concave gear teeth while rotating about the cutter rotation *** side cutting edges lay on the rake face formed through the blade,rake,and relief angles;hence,the normal cross-section of the cutter swept surface forms hyperboloid gear *** the accurate geometry of the cutter system,a relationship between the pressure and spiral angles of the gear tooth and the parameters of the cutter system is developed for the FORMAT machining of a hypoid gear.A new parameterization of the gear tooth surfaces is introduced to determine these angles for the accurate gear tooth by the accurate cutter system.A numerical example with different cutter systems and blade parameters is presented,demonstrating the effects of rake and relief angles over the pressure and spiral angles on mea n point projections and gear tooth ***,the change in pressure and spiral angles with respect to the rake and relief angles are plotted,and the results are ***,it is concluded that the pressure and spiral angles are changed up to a few seconds of a degree in the operating area of the tooth with the change in the back and side rake *** side relief angle exhibited little or no effect over the geometry of the gear tooth.

关键词： Hypoid gear Pressure angle spiral angle Accurate blade Cutter head

Exercise preconditioning alleviates ischemia-induced memory deficits by increasing circulating adiponectin

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Neural Regeneration Research 2025年第5期20卷 1445-1454页

作者： Meifeng Zheng Borui Zhang sonata s Y Yau Kwok-Fai so Li Zhang Haining Ou Department of Rehabilitation Medicine Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation Medicine The Fifth Clinical College of Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Key Laboratory of CNs Regeneration(Ministry of Education) Guangdong-Hong Kong-Macao Institute of CNS RegenerationJinan UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation sciences The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina state Key Laboratory of Brain and Cognitive science Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong Special Administrative RegionChina Center for Exercise and Brain science School of PsychologyShanghai University of SportShanghaiChina Neuroscience and Neurorehabilitation Institute University of Health and Rehabilitation SciencesQingdaoShandong ProvinceChina

Cerebral ischemia is a major health risk that requires preventive approaches in addition to drug *** exercise enhances neurogenesis and synaptogenesis,and has been widely used for functional rehabilitation after *** this study,we determined whether exercise training before disease onset can alleviate the severity of cerebral *** also examined the role of exercise-induced circulating factors in these *** mice were subjected to 14 days of treadmill exercise training before surgery for middle cerebral artery *** found that this exercise pre-conditioning strategy effectively attenuated brain infarct area,inhibited gliogenesis,protected synaptic proteins,and improved novel object and spatial memory *** analysis showed that circulating adiponectin plays a critical role in these preventive effects of *** activation of adiponectin receptors by Adipo Ron mimicked the effects of exercise,while inhibiting receptor activation abolished the exercise *** summary,our results suggest a crucial role of circulating adiponectin in the effects of exercise pre-conditioning in protecting against cerebral ischemia and supporting the health benefits of exercise.

关键词： adiponectin cerebral ischemia exercise pre-conditioning hippocampus memory function middle cerebral artery occlusion prefrontal cortex synaptic proteins treadmill exercise

Contribution of biophysical and climate variables to the spatial distribution of wildfires in Iran

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Journal of Forestry Research 2023年第6期34卷 1763-1775页

作者： Kobra shojaeizadeh mahmoud Ahmadi Abbasali Dadashi-Roudbari Department of Physical Geography Faculty of Earth SciencesShahid Beheshti UniversityTehranIran Department of Geography Ferdowsi University of MashhadMashhadIran

This study investigated the relationship between climate and biophysical variables in burned areas in *** fire burned area(FBA)product(Fire CCI 5.1.1),land surface temperature(MOD11C3C),vegetation index(MOD13A1),and climate variables such as temperature,wind speed,relative humidity,and volumetric soil moisture from the ERA5 reanalysis dataset were *** correlation coefficient was used to determine the relationship between biophysical and climate variables and fire *** results show that FBA increased by 1.7 hectares/decade from 2001 to *** high FBA in 2010(the black summer of Iran)was due to high temperatures and significant heatwaves that led to extensive *** anthropogenic activities are considered a significant cause of wildfires,several variables,including increased temperatures,less precipitation,relative humidity,and wind speed and direction,contribute to the extent and occurrence of *** country’s FBA hotspot is in the Arasbaran region during the summer *** and relative humidity are the most significant variables influencing the occurrence of *** results show the vulnerability of Iran s forests and their high potential for *** the frequency of fire occurrences in Iran and the limited equipment,fire prevention plans should be carried out by applying proper management in high-risk regions.

关键词： Wildfire Burned areas Vegetation index(Ⅵ) Air temperature Iran

Mitigating diabetes-related complications:Empowering metformin with cholecalciferol and taurine supplementation in type 2 diabetic rats

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World Journal of Diabetes 2024年第8期15卷 1778-1792页

作者： Mai s Attia Fadwa Ayman Mohamed s Attia Galal Yahya Mansour H Zahra magdi Mohamed Ibrahim Khalil Abdel Aziz A Diab Department of Zoology Faculty of ScienceZagazig 44519Egypt Department of Pharmaceutics Faculty of PharmacyZagazig 44519Egypt Department of Microbiology and Immunology Faculty of PharmacyZagazig UniversityZagazig 44519Egypt Department of Biochemistry Faculty of MedicineZagazig 44519Egypt

BACKGROUND Type 2 diabetes is one of the most prevalent chronic diseases worldwide,significantly impacting patients'quality of *** treatment options like metformin(MET)effectively counteract hyperglycemia but fail to alleviate diabetes-associated complications such as retinopathy,neuropathy,nephropathy,hepatopathy,and cardiovascular *** To propose the supplementation of cholecalciferol(CHO)and taurine(TAU)to enhance MET efficacy in controlling diabetes while minimizing the risk of associated *** The study involved sixty rats,including ten non-diabetic control rats and fifty experimental rats with type 2 diabetes induced by *** experimental rats were further subdivided into positive control and treatment *** four treatment groups were randomly allocated to a single MET treatment or MET combined with supplements either CHO,TAU,or *** Diabetic rats exhibited elevated levels of glucose,insulin,Homeostasis Model Assessment of Insulin Resistance(HOMA-IR),glycated hemoglobin percentage,lipid markers,aspartate aminotransferase,and malondialdehyde,along with reduced levels of antioxidant enzymes(catalase and superoxide dismutase).The administration of CHO and TAU supplements alongside MET in diabetic rats led to a noticeable recovery of islet *** antioxidative,anti-inflammatory,and anti-apoptotic properties of the proposed combination therapy significantly ameliorated the aforementioned *** The supplementation of CHO and TAU with MET showed the potential to significantly improve metabolic parameters and protect against diabetic complications through its antioxidative,anti-inflammatory,and antiapoptotic effects.

关键词： Diabetes complications Metformin Cholecalciferol Taurine Glycated hemoglobin% Antioxidant

Assessing effects of deficit irrigation techniques on water productivity of tomato for subsurface drip irrigation system

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International Journal of Agricultural and Biological Engineering 2018年第4期11卷 156-167页

作者： mahmoud s Hashem Tarek Zin El-Abedin Hussein M Al-Ghobari Agricultural Engineering Department College of Food and Agriculture SciencesKing Saud UniversityRiyadh 11451Saudi Arabia Agricultural Engineering Research Institute(AEnRI) Agricultural Research CenterGizaEgypt Agricultural Engineering Department College of AgricultureAlexandria UniversityAlexandriaEgypt

Water resources are subjected to ever-increasing supply constraints due to extensive agricultural water demand for irrigated ***,water-saving irrigation strategies need to be *** present study was conducted to explore the possibilities of using regulated deficit irrigation(RDI)and partial root zone drying irrigation(PRD)methods as water-saving irrigation techniques for subsurface *** objective of this study are to assess the effects of RDI and PRD irrigation on the water productivity of vegetable crops(tomato)under ssD systems in arid climatic conditions,and to compare the responses of tomato crops to PRD,RDI,and FI under an ssD system in terms of productivity,crop quality,and the amount of water *** field experiment was conducted during the fall 2014-2015 and 2015-2016 seasons in an experimental field located on an educational farm owned by the Faculty of Food and Agriculture sciences Department,King saud University,Riyadh,Kingdom of saudi *** area of 102.7 m^(2)(13 m×7.9 m)was allocated for the experiment to manage three treatments:RDI,PRD,and full irrigation(FI).The RDI and PRD treatments received 70%of the irrigation water volume of *** was replicated three *** most important results indicated that the soil water content(sWC)for the RDI and PRD treatments was lower than that of the FI *** had the highest stomatal conductance values(gs),while PRD had the lowest stomatal conductance *** photosynthetic rate(A_(n))was lower under RDI and PRD compared to ***,there was no significant change in A_(n) between treatments for most readings taken during both time periods,which means that the water saving treatments(PRD and RDI)did not affect the net photosynthesis rate,thereby enhancing irrigation water use efficiency(IWUE)under DI *** water-saving irrigation techniques decreased transpiration rate(T)compared to the FI *** values of the abscisic acid(ABA)contents were higher

关键词： full irrigation(FI) regulated deficit irrigation(RDI) partial root zone drying(PRD) irrigation water use efficiency(IWUE)

Antidiarrheal and protein conservative activities of Psidium guajava in diarrheal rats

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Journal of Integrative Medicine 2019年第1期17卷 57-65页

作者： Khaled M.M.Koriem mahmoud s.Arbidb Hend N.saleh Department of Medical Physiology National Research Centre Department of Pharmacology National Research Centre Faculty of Pharmacy Cairo University

Objective: Psidium guajava occurs worldwide in tropical and subtropical areas. It has been used to treat inflammation, diabetes, fever, hypertension and ulcers. However, its antidiarrheal and protein conservative activities still need to be ***: Fifty-four male rats were divided into normal and diarrheal rats. The normal rats were divided into 4 groups: control, low-dose P. guajava leaf extract(50 mg/kg), high-dose P. guajava leaf extract(100 mg/kg) and gallic acid. Treatments were administrated orally in 1 mL saline for a 1-month *** diarrheal rats were divided into 5 groups: desmopressin(0.2 mg/kg) drug, low-dose P. guajava leaf extract(50 mg/kg), high-dose P. guajava leaf extract(100 mg/kg), gallic acid and an untreated *** were given daily for a 1-month period while the untreated control received no ***: Diarrhea was responsible for an observed decline in kidney weight and serum sodium, potassium and chloride. Further, diarrhea was positively correlated with a significant increase in urine volume, and excretion of electrolytes, serum urea, creatinine and uric acid in the urine. In contrast, there was a proportional increase in the lipid peroxidation value in diarrhea and a significant decline was observed in serum superoxide dismutase, glutathione peroxidase and glutathione levels in diarrhea. Also, diarrhea inhibited blood proteins. The oral intake of P. guajava leaf extract by diarrheal rats restored all of these parameters to near normal levels. High-dose P. guajava leaf extract was more effective than the same compound at a low ***: P. guajava leaf extract elicited antidiarrheal and protein conservative effects.

关键词： Psidium guajava Myrtaceae Diarrhea Proteins Antioxidant

Flexural Behavior of Cross-Connected Brick Masonry Infill Wall Panels supported on Reinforced Concrete Beam Grids

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Journal of shanghai Jiaotong university(science) 2024年第5期29卷 889-899页

作者： BAYOUMI El-said Abd-Allah mahmoud mahmoud Hassan ARIF Mohammed Department of Civil Engineering College of EngineeringQassim UniversityBuraidah51452Saudi Arabia Engineering Expert at Ministry of Justice Cairo11516Egypt Department of Civil Engineering Faculty of EngineeringAl-Azhar UniversityCairo11651Egypt Department of Civil Engineering Aligarh Muslim UniversityAligarh202002India

This paper presents an experimental investigation on the flexural behavior of cross-connected brick masonry infill wall panels supported on reinforced concrete beam grids above and below the *** experimental program was comprised of six wall *** effect of change in lower beam stiffness relative to the wall and the geometry of the main walls were *** the results of the experimental tests,the increase in the depth of the lower beam grid reduces the deflection,resulting in an increase in the load carrying capacity of the ***,the stiffness of the main walls affects the deflection and the failure load of the cross walls.

关键词： brick masonry infill walls reinforced concrete beam grid main and cross walls stiffness deflection crack pattern failure load

The Roman k-domatic Number of a Graph

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Acta Mathematica sinica,English series 2011年第10期27卷 1899-1906页

作者： seyed mahmoud sHEIKHOLEsLAMI Lutz VOLKMANN Department of Mathematics Azarbaijan University of Tarbiat MoaUem Tabriz 53714-161 L R. Iran and School of Mathematics Institute for Research in Fundamental Sciences ( IPM) Lehrstuhl H fiir Mathematik RWTH Aachen University 52056 Aachen Germany

Let k be a positive integer. A Roman k-dominating function on a graph G is a labeling f ： V（G） → {0, 1, 2} such that every vertex with label 0 has at least k neighbors with label 2. A set {f1, f2,..., fd} of distinct Roman k-dominating functions on G with the property that ∑di=1 fi（v） ≤ 2 for each v C V（G）, is called a Roman k-dominating family （of functions） on G. The maximum number of functions in a Roman k-dominating family on G is the Roman k-domatic number of G, denoted by dkR（G）. Note that the Roman 1-domatic number dlR（G） is the usual Roman domatic number dR（G）. In this paper we initiate the study of the Roman k-domatic number in graphs and we present sharp bounds for dkR（G）. In addition, we determine the Roman k-domatic number of some graphs. some of our results extend those given by sheikholeslami and Volkmann in 2010 for the Roman domatic number.

关键词： Roman domination number Roman domatic number Roman k-domination number Ro- man k-domatic number

Biosynthesis of titanium dioxide nanoparticles using Hypericum perforatum and Origanum vulgare extracts and their main components,hypericin and carvacrol as promising antibacterial agents

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Journal of Traditional Chinese Medicine 2022年第2期42卷 167-175页

作者： Mojtaba Khaksarian mahmoud Bahmani Morovat Taherikalani Behnam Ashrafi mahmoud Rafieian-Kopaei Naser Abbasi Department of Physiology and Pharmacology School of MedicineRazi Herbal Medicines Research CenterLorestan University of Medical SciencesKhorramabadIran Biotechnology and Medicinal Plants Research Center Ilam University of Medical SciencesIlamIran Razi Herbal Medicines Research Center Lorestan University of Medical SciencesKhorramabadIran Department of Microbiology School of MedicineLorestan University of Medical SciencesKhorramabadIran Medical Plants Research Center Basic Health Sciences InstituteShahrekord University of Medical SciencesShahrekordIran department of Pharmacology Faculty of Medicine Ilam University of Medical sciences IlamIran

OBJECTIVE:To evaluate the anti-bacterial activities of titanium dioxide(Ti O;)nanoparticles of Origanum(O.)vulgare and Hypericum(H.)perforatum extracts,carvacrol and hypericin against staphylococcus(s.)***:In this study,Ti O;nanoparticles of *** and *** extracts,carvacrol and hypericin,were prepared and their antibacterial effects were evaluated against staphylococcus(s.)*** this study,scanning electron microscope,fourier transform infrared spectrometer,atomic force microscopy,dynamic light scattering and zeta potential were used to investigate the structure of synthesized ***:Anti-bacterial activity of synthesized NPs was tested by minimum inhibitory concentration(MIC),minimum bactericidal concentration and disc diffusion *** of Ti O;-NPs synthesized using ***,***,carvacrol and hypericin and Ti O;were obtained 250,62.5,250,and 250,and 500μg/m L,*** MBCs for all of these were obtained 1000μg/m ***:Green-synthesized of Ti O;nanoparticles provides a promising approach to the use of *** and ***,carvacrol and hypericin as novel agents and safer antibacterial compounds,especially *** compounds.

关键词： plant medicinal medicine traditional anti-infective agents active ingredient nano-compounds