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An experimental evaluation of polyamide membrane-silica nanoparticles for the concentration of pomegranate juice

Food Bioscience 2023年第1期51卷 366-381页

作者： Xiang Li Fangfang Liu A.Abdollahpour m.h.jazebizadeh Jialian Wang semiromi3school of marine and biological engineering yancheng teachers universityjiangsu224007china department of chemical engineering shiraz branchislamic azad universityshiraziran department of mechanical engineering khomeinishahr branchislamic azad universitykhomeinishahriran

membrane processes are used in the food and nutrient industry in terms of their proper performance and selective *** the membranes in fruit juice concentrating operations improves its quality via shelf-life *** advantage of reverse osmosis(RO)and membrane technology over other methods is its nonchemical reaction to fruit juice which increases the concentration of fruit *** membranes were made of three layers of non-woven polyester layer for the mechanical strength of the membrane,polyester sulfone polymer with polyamide consisting of polymerization of m-Phenylenediamine(mPD)and benzene tricarbonyl *** chloride(TmC)was used to modify the properties of the membrane in the second layer using silica *** feed was sugar-free pomegranate juice added by SUNICh Company with an initial Brix value of 14.9%and an input feed of 6.6%to the RO *** DESIGN-EXPERT method for the design of experiments(DOE)by considering three parameters of weight percentage of polyester sulfone polymer(12,16,and 20%),silica nanoparticles(0,0.1,and 0.2 wt%),and operating pressure were used(20,25,and 30 times).Under optimal conditions,46.15%of the concentrated pomegranate juice were obtained by experiment and the amount of brix increased from 33.24%to 47.21%.Scanning electron microscope(SEm),Fourier-transform infrared spectroscopy(FTIR),and contact angle tests for membranes were *** the analysis of contact angle by examining the degree of hydrophilicity and contact angle of water droplets,it was found that the presence of silica nanoparticles and polyamide layer caused more hydrophilicity of *** can be concluded that the pressure parameter,together with the presence of nanoparticles and polymer percentages,contribute to the most successful procedure of concentrating pomegranate juice.

关键词： Polyamide membrane Silica nanoparticles Condensation membrane processes Reverse osmosis

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Performance evaluation of polyamide reverse osmosis membranes incorporated silica nanoparticles for concentrating peach juice:An invitro evaluation

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Food Bioscience 2022年第4期48卷 646-656页

作者： X.Li Fuping Zheng R.mohammadi m.h.jazebizadeh D.Semiromi School of marine and Biological Engineering Yancheng Teachers UniversityJiangsu224007China Beijing Laboratory of Food Quality and Safety Beijing Technology and Business UniversityBeijing100048China Department of Chemical Engineering Shiraz BranchIslamic Azad UniversityShirazIran Department of mechanical Engineering Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran

In this study,a mixture of water and peach juice is used as feed for the reverse osmosis(RO)*** sheet,polyester sulfone polymer and polyamide from interfacial polymerization of m-phenylenediamine(mPD)and trimesoyl chloride(TmC)monomers with silica nanoparticles are used to produce the membrane.A solution of Poly(ether sulfone)(PES)is prepared in N-methyl-2-pyrrolidone(NmP)solvent with 10 wt%,15 wt%,and 20 wt%and the addition of 0.5 wt%,1.5 wt%,and 3 wt%of silica *** electron microscope(SEm)and Fourier transform infrared(FTIR)analysis are used to evaluate the morphology and functional groups of the prepared *** to the SEm images,it is observed that the membrane consists of three layers and the polyamide layer(surface)of the membrane,is responsible for the main separation is dense hills and valleys’surface *** polyester sulfone layer(middle)has finger-shaped porosity and the obtained results of the contact angle test show that with increasing silica nanoparticles,the membrane becomes more hydrophilic and the angle decreases as the polyester sulfone layer(middle)have finger-shaped *** bonds formed in the resulting membrane structure were identified,including sulfonylide,polyamide,and silica *** results of the contact angle test show that as the silica nanoparticle increases,the membrane became more hydrophilic and the angle was *** sample with 3%nanoparticles has the lowest angle and the highest level of hydrophilicity,followed by the membrane 151.5,which has 1.5%nanoparticles,and then the membrane 150 without nanoparticles.

关键词： Reverse osmosis Concentration membrane Silica nanoparticles Polyamide

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The sexually dimorphic expression of glutamate transporters and their implication in pain after spinal cord injury

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Neural Regeneration Research 2025年第11期20卷 3317-3329页

作者： Jennifer m.Colón-mercado Aranza I.Torrado-Tapias Iris K.Salgado Jose m.Santiago Samuel E.Ocasio Rivera Dina P.Bracho-Rincon Luis h.Pagan Rivera Jorge D.miranda Department of Physiology University of Puerto RicoMedical Sciences CampusSan JuanPRUSA National Institutes of health National Human Genome Research InstituteBethesdaMDUSA Universidad Central del Caribe School of MedicineBayamónPRUSA University of Puerto Rico Carolina CampusCarolinaPRUSA Institute of Neurobiology San JuanPRUSA

In addition to the loss of motor function,~60% of patients develop pain after spinal cord *** cellular-molecular mechanisms are not well understood,but the data suggests that plasticity within the rostral,epicenter,and caudal penumbra of the injury site initiates a cellularmolecular interplay that acts as a rewiring mechanism leading to central neuropathic *** can lead to the formation of new connections triggering abnormal sensory *** excitatory glutamate transporters are responsible for the reuptake of extracellular glutamate which makes them a critical target to prevent neuronal hyperexcitability and *** previous studies showed a sexually dimorphic therapeutic window for spinal cord injury after treatment with the selective estrogen receptor modulator *** this study,we investigated the anti-allodynic effects of tamoxifen in male and female rats with spinal cord *** hypothesized that tamoxifen exerts anti-allodynic effects by increasing the expression of glutamate transporters,leading to reduced hyperexcitability of the secondary neuron or by decreasing aberrant *** and female rats received a moderate contusion to the thoracic spinal cord followed by subcutaneous slow-release treatment of tamoxifen or matrix pellets as a control(placebo).We used von Frey monofilaments and the“up-down method”to evaluate mechanical *** treatment decreased allodynia only in female rats with spinal cord injury revealing a sexdependent *** expression profile of glutamatergic transporters(excitatory amino acid transporter 1/glutamate aspartate transporter and excitatory amino acid transporter 2/glutamate transporter-1)revealed a sexual dimorphism in the rostral,epicenter,and caudal areas of the spinal cord with a pattern of expression primarily on *** rodents showed a significantly higher level of excitatory amino acid transporter-1 expression while male rodents showed increased

关键词： allodynia central neuropathic pain EAAT-1/GLAST EAAT-2/GLT-1 glutamate transporters selective estrogen receptor modulator sexual dimorphism spinal cord injury trauma

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Free vibration and buckling analysis of polymeric composite beams reinforced by functionally graded bamboo fbers

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Applied mathematics and mechanics(English Edition) 2024年第3期45卷 543-562页

作者： h.m.FEIZABAD m.h.YAS Department of mechanical Engineering Razi UniversityKermanshah ***Iran

Natural fibers have been extensively researched as reinforcement materials in polymers on account of their environmental and economic advantages in comparison with synthetic fibers in the recent *** fibers are renowned for their good mechanical properties,abundance,and short cycle *** beams are one of the fundamental structural components and are susceptible to mechanical loads in engineering applications,this paper performs a study on the free vibration and buckling responses of bamboo fiber reinforced composite(BFRC)beams on the elastic *** different functionally graded(FG)layouts and a uniform one are the considered distributions for unidirectional long bamboo fibers across the *** elastic properties of the composite are determined with the law of *** hamilton’s principle,the governing equations of motion are *** generalized differential quadrature method(GDQm)is then applied to the equations to obtain the *** achieved outcomes exhibit that the natural frequency and buckling load values vary as the fiber volume fractions and distributions,elastic foundation stiffness values,and boundary conditions(BCs)and slenderness ratio of the beam ***,a comparative study is conducted between the derived analysis outcomes for BFRC and homogenous polymer beams to examine the effectiveness of bamboo fibers as reinforcement materials,demonstrating the significant enhancements in both vibration and buckling responses,with the exception of natural frequencies for cantilever beams on the Pasternak foundation with the FG-◇fiber ***,the obtained analysis results of BFRC beams are also compared with those for carbon nanotube reinforced composite(CNTRC)beams found in the literature,indicating that the buckling loads and natural frequencies of BFRC beams are lower than those of CNTRC beams.

关键词： bamboo fiber free vibration buckling analysis functionally graded(FG)beam elastic foundation generalized differential quadrature method(GDQm)

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Analytical model for thermal lensing and spherical aberration in diode side-pumped Nd:YAG laser rod having Gaussian pump profile

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Chinese Physics B 2015年第12期24卷 334-341页

作者： m h moghtader Dindarlu m Kavosh Tehrani h Saghafifar A maleki Institute of Optics and Laser Malek-Ashtar University of Technology

In this paper, according to the temperature and strain distribution obtained by considering the Gaussian pump profile and dependence of physical properties on temperature, we derive an analytical model for refractive index variations of the diode side-pumped Nd：YAG laser rod. Then we evaluate this model by numerical solution and our maximum relative errors are 5% and 10% for variations caused by thermo–optical and thermo–mechanical effects; respectively. Finally, we present an analytical model for calculating the focal length of the thermal lens and spherical aberration. This model is evaluated by experimental results.

关键词： side-pumped laser rod Gaussian pump profile thermal effects thermal lens spherical aberration

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microstructure evolution of a recycled Al-Fe-Si-Cu alloy processed by tube channel pressing

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International Journal of minerals,metallurgy and materials 2018年第10期25卷 1166-1172页

作者： m.h.Farshidi m.Rifai h.miyamoto Department of materials Science and metallurgical Engineering Ferdowsi University of Mashhad Department of mechanical Engineering Doshisha University

Although excellent recyclability is one of the advantages of Al alloys, a recycling process can reduce different properties of these alloys by adding coarse AlFeSi particles into the alloys' microstructures. One of the well-known methods for modifying the microstructure of metallic materials is the imposition of severe plastic deformation(SPD). Nevertheless, the microstructure evolutions of recycled Al alloys containing extraordinary fractions of AlFeSi particles during SPD processing have seldom been considered. The aim of the present work is to study the microstructure evolution of a recycled Al–Fe–Si–Cu alloy during SPD processing. For this purpose, tubular specimens of the mentioned alloy were subjected to different numbers of passes of a recently developed SPD process called tube channel pressing(TCP); their microstructures were then studied using different techniques. The results show that coarse AlFeSi particles are fragmented into finer particles after processing by TCP. however, decomposition and dissolution of AlFeSi particles through TCP processing are negligible. In addition, TCP processing results in an increase in hardness of the alloy, which is attributed to the refinement of grains, to an increase of the dislocation density, and to the fragmentation of AlFeSi particles.

关键词： AlFeSi intermetallic particle severe plastic deformation microstructure tube channel pressing

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Solvability of a class of PT-symmetric non-hermitian hamiltonians：Bethe ansatz method

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Chinese Physics B 2017年第6期26卷 14-21页

作者： m Baradaran h Panahi Department of Physics University of Guilan Rasht 41635-1914Iran

We use the Bethe ansatz method to investigate the Schrdinger equation for a class of PT-symmetric non-hermitian hamiltonians. Elementary exact solutions for the eigenvalues and the corresponding wave functions are obtained in terms of the roots of a set of algebraic equations. Also, it is shown that the problems possess sl（2） hidden symmetry and then the exact solutions of the problems are obtained by employing the representation theory of sl（2） Lie algebra. It is found that the results of the two methods are the same.

关键词： PT-symmetry Bethe ansatz method Lie algebraic approach quasi-exactly solvable

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A STABILITY ThEOREm FOR CONSTRAINED OPTImAL CONTROL PROBLEmS

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Journal of Computational mathematics 2004年第5期22卷 633-640页

作者： m.h.Farag DepartmentofmathematicsandComputerScienceFacultyofEducation lbriSultanateofOman

This paper presents the stability of difference approximations of an optimal control problem for a quasilinear parabolic equation with controls in the coefficients, boundary conditions and additional restrictions. The optimal control problem has been convered to one of the optimization problem using a penalty function technique. The difference approximations problem for the considered problem is obtained. The estimations of stability of the solution of difference approximations problem are proved. The stability estimation of the solution of difference approximations problem by the controls is obtained.

关键词： Finite difference method Penalty function methods Quasilinear Parabolic equations Stability estimations

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Influence of Zn^(2+)or Cu^(2+) on Reduction and Recalcination Behavior of Fe_2TiO_5

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Journal of materials Science & Technology 2007年第5期23卷 697-702页

作者： m.Bahgat m.h.Khedr h.S.Abdelmaksoud CmRDI P.O.Box 87-HelwanCairoEgypt Chemistry Department Faculty of ScienceBenisuef UniversityEgypt

Fe2O3, TiO2, CuO and ZnO powders were mixed according to the formula of （1-x）TiO2 xCuO-Fe2O3 or （1-x）TiO2 xZnO-Fe2O3 （x=0, 0.2 0.4, 0.6, 0.8, 1）, and well ball-milled with h2O for 3 h to ensure homogeneity of the powdered solids, then fired at 1200℃ for 4 h. The fired samples were reduced at 500℃ with hydrogen gas. The reduced samples were subjected to recalcination at 500℃ in CO2 atmosphere. Both of fired, reduced and calcined samples were characterized by X-ray diffraction, vibrating sample magnetometry, reflected light microscopy and scanning electron microscopy. Different phases were formed after firing of Cu^＋2 or Zn^2＋ substituted Fe2TiO5. magnetization （Bs） of the formed phases after firing are very low corresponding to diluted magnetic semiconductors （DmS） and increases with increasing the substituted cations （Cu^＋2 or Zn^2＋）. The reduction of the fired samples enhanced the Bs values whereas the reducibility increases with increasing the Cu^＋2 or Zn^2＋ content. Samples show different tendency toward CO2 decomposition which is very important for environmental minimization for CO2.

关键词： Nanosized ferrite Titanate Reduction magnetic properties Reduction-recalcin-ation CO2 decomposition

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Experimental study of electro-optical-switched pulsed Nd:YAG laser

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Chinese Physics B 2016年第3期25卷 210-214页

作者： A maleki m Kavosh Tehrani h Saghafifar m h moghtader Dindarlu Optic & Laser Science & Technoltogy Research Center Malek-Ashtar University of Technology Isfahan Iran

We report the specification of a compact and stable side diode-pumped Q-switched pulsed Nd：YAG laser. We ex- perimentally study and compare the performance of the pulsed Nd：YAG laser in the free-running and Q-switched modes at different pulse repetition rates from 1 hz to 100 hz. The laser output energy is stabilized by using a special configu- ration of the optical resonator. In this laser, an unsymmetrical concave-concave resonator is used and this structure helps the mode volume to be nearly fixed when the pulse repetition rate is increased. According to the experimental results in the Q-switched operation, the laser output energy is nearly constant around 70 mJ with an FWhm pulse width of 7 ns at 100 hz. The optical-to-optical conversion efficiency in the Q-switched regime is 17.5%.

关键词： side diode-pumped Nd:YAG laser concave-concave resonator electro-optical Q-switched laser

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