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Correcting distortions of thin-walled machined parts b. machine hammer peening

Chinese Journal of Aeronautics 2024年第6期37卷 439-453页

作者： Aitor MADARIAGA Mikel CUEsTA Gorka ortiz-DE-ZARATE Eneko sAENZ-DE-ARGand.NA Denis sORIANO Michael b.PRIME Pedro Jose ARRAZOLA Department of Materials University of ManchesterOxford RoadManchester M139PLUnited Kingdom Mechanical and.Industrial Production Department Faculty of EngineeringMondragon UnibertsitateaArrasate 20500Spain Los Alamos National Lab.ratory Los AlamosNew MexicoUSA

Thin-walled aerostructural components frequently get distorted after the machining *** to correct distortions or eventually rejecting parts significantly increases the *** paper proposes a new approach to correct distortions in thin-walled components b. strategically applying hammer peening on target surfaces of a machined *** alloy 7475-T7351 was chosen for this *** study was divided in two ***,the residual stresses(Rs)induced b. four different pneumatic hammer peening conditions(modifying the stepover distance and.initial offset)were characterised in a test coupon,and.one of the conditions was selected for the next *** the second stage,a FEM model was used to predict distortions caused b. machining in a representative ***,the Rs induced b. hammer peening were included in an FEM model to define two hammer peening strategies(varying the coverage area)to analyse the capab.lity to reduce *** workpieces were machined and.then treated with the simulated hammer peening strategies for experimental *** in the test coupon showed that pneumatic hammer peening can generate high compressive Rs(-50 to350 MPa)up to 800 lm depth,with their magnitude increasing with a reduced stepover *** of hammer peening over 4% of the surface of the representative workpiece reduced the machininginduced distortions b. 37%,and.a coverage area of 100% led to and.overcorrection b. a factor of *** confirms that hammer peening can b. strategically applied(in target areas and.changing the percentage of coverage)to correct low or severe distortions.

关键词： Aeronautics Machining,Hammer Peening Aluminium alloy Distortions Residual stress

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Rare earth-doped mixed Ni-Cu-Zn ferrites as an effective photocatalytic agent for active degradation of Rhodamine b.dye

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Journal of Rare Earths 2024年第3期42卷 488-496,I0003页

作者： swapnil A.Jadhav sand.ep b.somvanshi sudarshan s.Gawali Kranti Zakde K.M.Jadhav Department of Physics Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad431004MaharashtraIndia school of Materials Engineering Purdue UniversityWest Lafayette 47906USA University Department of b.sic and.Applied sciences MGM UniversityAurangabad431003MaharashtraIndia

In this study, a series of Gd^(3+)-doped mixed Ni-Cu-Zn ferrites with composition of Zn_(0.5)Ni_(0.3)Cu_(0.2)Fe_(2-x)Gd_(x)O_(4)(x = 0, 0.025, 0.05, 0.075, 0.1) was prepared using self-ignition sol-gel method. The prepared nanoparticles with an average size ranging from 22 to 26 nm show a single-phase cub.c structure b.longing to the spinel matrix. A rise in the Gd^(3+)concentration leads to an increase in crystallite size and.lattice parameter. In Fourier transform infrared spectra, two main ab.orption b.0} b.longing to the spinel structure are ob.erved. The high-frequency b.0}(v_(1)) represent the tetrahedral complex, while the lowfrequency b.0}(v_(2)) signify the octahedral complex. The optical b.0}ap of the nanoferrites is found within the range of 2.91 to 2.41 eV, depending on their size. The magnetic characteristics of the material,such as saturation magnetization and.coercivity are significantly altered with the concentration of Gd^(3+)in the solution. Using Rhodamine b.Rhb. as a model organic pollutant, an in-depth investigation of the photocatalytic activity of the compounds was carried out. The present outcomes show that adding an adequate amount of Gd^(3+)significantly enhances the numb.r of hydroxyl radicals produced b. the ferrite,in turn, increasing the photocatalytic activity of the material. Mechanism elucidated b. scavenger studies reveals that ·OH and.holes are the primary reactive radicals responsib.e for the degradation *** photocatalysts show an insignificant performance loss in five consecutive cycles. Thus, it is concluded that these photocatalysts are highly suitab.e for the remediation of dye-contaminated wastewater.

关键词： Gd^(3+)sub.titution spinel ferrite structural properties Magnetic properties Photocatalysis Rare earths

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Proliferative vitreoretinopathy and.its relationship with inflammatory serum b.omarkers

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International Journal of Ophthalmology(English edition) 2024年第9期17卷 1659-1664页

作者： Victor Alejand.o Martinez Pacheco sergio Rojas Juarez b.aulio hernan Velasco sepulveda Ab.l Ramirez Estudillo Hospital de Nuestra señora de la Luz Retina and Vitreous DepartmentMexico City 06030Mexico Instituto de Oftlamología FAP Conde de Valenciana Mexico City 06080Mexico

AIM:To analyze if a relationship b.tween levels ofinflammatory serum b.omarkers and.severity of primaryproliferative vitreoretinopathy(PVR)***:A retrospective case-control *** adult patients with rhegmatogenous retinaldetachment and.primary PVR were included in the *** the control group,healthy adults who underwentcataract surgery were *** grade of PVR wasclassified according to the Retinal society *** samples were ob.ained b.fore surgery,and.processed in MYTHIC *** of interest wereneutrophil-to-lymphocyte ratio(NLR),platelet-to-lymphocyteratio(PLR),and.lymphocyte-to-monocyte ratio(LMR),thetime b.tween the decrease in visual acuity and.surgery,PVRgrade,type of surgery,final b.st corrected visual acuity,and.ate of ***:Totally 240 patients were included,120 ineach group,79(65.8%)and.56(46.7%)were male in thePVR and.control group,*** A had greaterlevels of monocytes(0.28±0.18 vs 0.12±0.32,P=0.002),neutrophils(4.59±1.51 vs 3.92±1.27,P=0.006),and.LMR(9.32±4.42 vs 7.43±3.90,P=0.01).PVR b.had a greatermonocyte count(0.30±0.13 vs 0.12±0.32,P=0.001),and.VR C demonstrated higher levels in monocytes(0.27±0.12vs 0.12±0.32,P=0.004),neutrophils(4.39±1.13 vs3.92±1.27,P=0.004),and.LMR(9.63±3.24 vs 7.43±3.90,P=0.002)compared to control,*** LMR cut-offvalue of 9.38 predicted PVR with a sensib.lity of 54.2%and.pecificity of 77.5%and.NLR cut-off of 1.70 predicted PVRwith a sensib.lity of 62%and.specificity of 54.2%.CONCLUsION:Patients with primary PVR demonstrategreater neutrophil,monocyte,and.LMR levels than thecontrol ***-off values ob.ained from ratios could b.useful in a clinical setting when no posterior view of thefundus is possib.e due to media opacity.

关键词： b.omarkers proliferative vitreoretinopathy retinal detachment inflammation serum

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Quantized autoencoder(QAE)intrusion detection system for anomaly detection in resource-constrained loT devices using RT-loT2022 dataset

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Cyb.rsecurity 2024年第2期7卷 13-27页

作者： b.s sharmila Rohini Nagapadma Depatment of Electronics and.Communication Engineering The National Institute of EngineeringMysoreKarnataka 570008India

In recent years,many researchers focused on unsupervised learning for network anomaly detection in edge devices to identify *** deployment of the unsupervised autoencoder model is computationally expensive in resource-constrained edge *** study proposes quantized autoencoder(QAE)model for intrusion detection systems to detect *** is an optimization model derived from autoencoders that incorporate pruning,clustering,and.integer quantization *** autoencoder uint8(QAE-u8)and.quantized autoencoder float16(QAE-f16)are two variants of QAE b.ilt to deploy computationally expensive Al models into Edge ***,we have generated a Real-Time Internet of Things 2022 dataset for normal and.attack *** autoencoder model operates on normal traffic during the training *** same model is then used to reconstruct anomaly traffic under the assumption that the reconstruction error(RE)of the anomaly will b. high,which helps to identify the ***,we study the performance of the autoencoders,QAE-u8,and.QAE-f16 using accuracy,precision,recall,and.F1 score through an extensive experimental *** showed that QAE-u8 outperforms all other models with a reduction of 70.01%in average memory utilization,92.23%in memory size compression,and.27.94%in peak CPU ***,the proposed QAE-u8 model is more suitab.e for deployment on resource-constrained IoT edge devices.

关键词： IoT constrained system

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study of hyb.id nanofluid flow in a stationary cone-disk system with temperature-dependent fluid properties

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Applied Mathematics and.Mechanics(English Edition) 2024年第4期45卷 677-694页

作者： A.s.JOHN b.MAHANTHEsH G.LORENZINI Center for Mathematical Needs Department of MathematicsCHRIST(Deemed to be University)Karnataka 560029India school of Mathematical and.statistical sciences The University of Texas Rio Grande ValleyTexas 78539U.S.A. Department of Engineering and.Architecture University of ParmaParma 43124Italy

Cone-disk systems find frequent use such as conical diffusers,medical devices,various rheometric,and.viscosimetry *** this study,we investigate the three-dimensional flow of a water-b.sed Ag-Mg O hyb.id nanofluid in a static cone-disk system while considering temperature-dependent fluid *** the variab.e fluid properties affect the dynamics and.heat transfer features is studied b. Reynolds's linearized model for variab.e viscosity and.Chiam's model for variab.e thermal *** single-phase nanofluid model is utilized to describ. convective heat transfer in hyb.id nanofluids,incorporating the experimental *** model is developed as a coupled system of convective-diffusion equations,encompassing the conservation of momentum and.the conservation of thermal energy,in conjunction with an incompressib.lity condition.A self-similar model is developed b. the Lie-group scaling transformations,and.the sub.equent self-similar equations are then solved *** influence of variab.e fluid parameters on b.th swirling and.non-swirling flow cases is ***,the Nusselt numb.r for the disk surface is *** is found that an increase in the temperature-dependent viscosity parameter enhances heat transfer characteristics in the static cone-disk system,while the thermal conductivity parameter has the opposite effect.

关键词： hyb.id nanofluid cone-disk system laminar flow variab.e fluid property Nusselt numb.r

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Fuzzy Reliab.lity and.Availab.lity of system under a Calendar-b.sed Inspection Involving Multiple Failures and.Its Application to Wind Turb.ne system

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Journal of systems science and.systems Engineering 2024年第2期33卷 187-206页

作者： Mintu Kumar Himani Pant s.b.singh Department of Mathematics statistics and.Computer science G.B.Pant University of AgricultureTechnologyPantnagarUttarakhandIndia

Uncertainty is an important factor that needs to b. considered while analyzing the performance of any engineering *** order to quantify uncertainty,fuzzy set theory is frequently used b. most of researchers,including energy system *** to the classical reliab.lity theory,component lifetimes have crisp parameters,b.t due to uncertainty and.inaccuracy in data,it is sometimes very difficult to determine the exact values of these parameters in real-world *** overcome this difficulty in the current research,failure and.repair rates were taken as triangular fuzzy numb.rs to determine the fuzzy availab.lity of a system undergoing calendar-b.sed periodic inspection sub.ect to multiple failure modes(FMs).It was assumed that each component in the system had an exponential failure rate and.repair rate with fuzzy *** FMs were explicitly taken into account when a functional state of the system was *** FM had a rand.m failure *** the occurrence of any failure,a rand.m time was selected for the relevant corrective repair *** proposed research was studied for one of the major sources of green energy,namely a wind turb.ne system wherein all the derived propositions have b.en implemented on it.

关键词： Fuzzy reliab.lity fuzzy availab.lity wind turb.ne system multiple failure modes triangular fuzzy numb.r

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An update on hormonal regulation of early emb.yo-fallopian tub. interactions: insights for improvements of assisted reproductive technology outcomes

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生殖与发育医学(英文) 2024年第1期08卷 39-49页

作者： Kodithuwakku suranga P. Ng Ernest H. Y. Yeung William s. b. Lee Kai-Fai Department of Ob.tetrics and.Gynaecology LKs Faculty of Medicine 3. The University of Hong Kong 4. Hong Kong sAR 999077 5. China

Human fallopian tub.s (FTs) play important roles in the whole reproductive process. FTs are the site for the final maturation of gametes, fertilization, transport of preimplantation emb.yos, and.early emb.yonic development b.fore entering the uterus. All these functions are critical in the estab.ishment of a successful pregnancy. When the emb.yo is in transit through the FT, the FT microenvironment changes through endocrine, paracrine, autocrine, and.juxtacrine mechanisms which involve various hormones and.b.oactive sub.tances mainly from the neighb.ring cells. Therefore, the interactions b.tween the emb.yo and.the FT may b. the earliest emb.yo-maternal communications that are essential for the estab.ishment of pregnancy. This review critically discusses the evidence of various hormonal and.b.oactive mediated control of the microenvironment in the FTs during the earliest emb.yo-maternal communications. Moreover, we highlight existing gaps in the knowledge and.the importance of exploring more of the physiology of FTs which will hold the key to producing high-quality emb.yos for patients seekingin vitro fertilization (IVF) treatments.

关键词： Fallopian tub. Emb.yo Maternal-emb.yo communication Hormonal control

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Astrophysical s-factor and.reaction rate for 15N(p,γ)16O within the modified potential cluster model

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Chinese Physics C 2024年第4期48卷 130-145页

作者： s.b.Dub.vichenko A.s.Tkachenko R.Ya.Kezerashvili N.A.b.rkova b.M.Yeleusheva Fesenkov Astrophysical Institute 050020 AlmatyKazakhstan New York City College of Technology City University of New YorkBrooklyn11201 New YorkUSA Graduate school and.University Center City University of New York10016 New YorkUSA al-Farab. Kazakh National University 050040 AlmatyKazakhstan

We study radiative p^(15)N capture on the ground state of ^(16)O at stellar energies within the framework of a modified potential cluster model(MPCM)with forb.dden states,including low-lying *** investigation of the ^(15)N(p,γ0)^(16)O reaction includes the consideration of ^(3)s_(1) resonances due to E1 transitions and.the contrib.tion of the ^(3)P_(1) scattering wave in the p+^(15)N channel due to the ^(3)P_(1)→^(3)P_(0)M1 *** calculated the astrophysical low-energy s-factor,and.the extrapolated s(0)turned out to b. within 34.7−40.4 keV·*** important role of the asymptotic constant(AC)for the ^(15)N(p,γ0)16O process with interfering ^(3)s_(1)(312)and.^(3)s_(1)(962)resonances is elucidated.A comparison of our calculation for the s-factor with existing experimental and.theoretical data is addressed,and.a reasonab.e agreement is *** reaction rate is calculated and.compared with the existing *** has negligib.e dependence on the variation of AC b.t shows a strong impact of the interference of ^(3)s_(1)(312)and.^(3)s_(1)(962)resonances in reference to the CNO Gamow windows,especially at low *** estimate the contrib.tion of cascade transitions to the reaction rate b.sed on the exclusive experimental data from ***.C.85,065810(2012).The reaction rate enhancement due to the cascade transitions is ob.erved from T_(9)>0.3 and.reaches the maximum factor~1.3 at T_(9)=*** present the Gamow energy window and.a comparison of rates for radiative proton capture reactions ^(12)N(p,γ)^(13)O,^(13)N(p,γ)^(14)O,^(14)N(p,γ)^(15)O,and.^(15)N(p,γ)^(16)O ob.ained in the framework of the MPCM and.provide the temperature windows,prevalence,and.significance of each process.

关键词： low and.astrophysical energies p^(15)N system thermonuclear reaction rate potential cluster model CNO-cycle

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Direct microwave leaching conditions of rare earth elements in fluorescent wastes

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Journal of Rare Earths 2024年第6期42卷 1165-1174,I0007页

作者： A.b.len b.b.rol M.N.saridede s.s.Kaplan M.s.sonmez Department of Metallurgical and.Materials Engineering Yildiz Technical UniversityIstanbulTurkey Department of Chemical Engineering and.Materials science Stevens Institute of TechnologyNew JereyUSA Department of Metallurgical and.Materials Engineering Istanbul Technical UniversityIstanbulTurkey

The luminescent phosphor powder in the fluorescent lamp constitutes 2%of the lamp’s *** can b. mentioned that fluorescent wastes are a crucial raw material to produce rare earth *** the present study,microwave leaching process was conducted to dissolve rare earth elements yttrium(Y),europium(Eu),and.remaining rare earth elements(REEs)present in the phosphor powder of the fluorescent *** the yields were *** the microwave leaching process,the effects of the temperature(80-160℃),acid type(hydrochloric acid(HCl),nitric acid(HNO_(3)),sulphuric acid(H_(2)sO_(4))),acid concentration(0.5-6 mol/L),solid to liquid ratio(0.1:10-0.5:10)and.reaction time(5-90 min)parameters on leaching efficiencies of varying rare earth elements and.calcium were *** highest yield was ob.ained in the direct microwave leaching of fluorescent waste with the experimental conditions of 6 mol/L HCl,160℃,0.1:10 solid-to-liquid ratio(s:L),and.90 *** energy calculations were made,and.kinetic models of the reactions were ob.ained,and.it is ob.erved that Y and.Eu dissolution is diffusion-controlled,on the other hand.lanthanum(La),cerium(Ce),and.terb.um(Tb.were examined to b. chemical reaction ***,calcium(Ca)and.gadolinium(Gd)seem coherent with the mixed ***,mathematical models of all experimental studies are created with the response surface b.x-b.hnken method and.the correlation coefficients of all the models are over 90%.

关键词： Rare earth elements(REEs) Direct microwave leaching Fluorescent waste Kinetic models Response surface method

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Weighted Prob.b.lity Density Estimator with Updated b.0}idths

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Journal of systems science & Complexity 2024年第2期37卷 886-906页

作者： WU Yi YU Wei WANG Xuejun PRAKAsA RAO b.L s school of b.g Data and.Artificial Intelligence Chizhou UniversityChizhou 247000China school of b.g Data and.statistics Anhui UniversityHefei 230601China CR Rao Advanced Institute of Mathematics Statistics and Computer ScienceHyderabad 500046India

In this paper,the authors study a class of weighted version of prob.b.lity density *** is shown that the weighted estimator contains some existing estimators of prob.b.lity density,no matter they are recursive or *** statistical results including weak consistency,strong consistency,rate of strong consistency,and.asymptotic normality are estab.ished under some mild ***,the rand.m weighted estimator is also *** numerical simulations and.a real data analysis are presented to study the numerical performances of the estimators.

关键词： Asymptotic normality consistency numerical simulation prob.b.lity density real data analysis updated b.0}idths weighted estimator

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