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Mechanistic insights into the novel glucose-sensitive behavior of P(NIPAM-co-2-AAPBA)

Science China Chemistry 2020年第3期63卷 377-385页

作者： Qingxian Wang Mian Fu Ying Guan Tony d.James Yongjun Zhang Key Laboratory of Functional Polymer Materials and State Key Laboratory of Medicinal Chemical Biology Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China department of Chemistry University of BathClaverton DownBath BA27AYUK

A glucose-sensitive polymer,poly(N-isopropylacrylamide-co-2-acrylamidophenylboronic acid)(P(NIPAM-co-2-AAPBA)),was synthesized by reversible addition fragmentation chain transfer(RAFT)*** of glucose results in reduced solubility and hence increased turbidity,rather than the normal increase in solubility(decreased turbidity)observed for other PBA-based glucose-sensitive *** novel glucose-sensitive behavior is explained by a new mechanism,in which glucose acts as an additive and depresses the lower critical solution temperature(LCST)of the polymer,instead of increasing solubility by increasing the degree of ionization of the PBA *** and theoretic analysis for the influence of glucose on the thermal behavior of P(NIPAM-co-2-AAPBA)reveals that glucose depresses the LCST of P(NIPAM-co-2-AAPBA)copolymers in a two-stage manner,a fast decrease at low glucose concentrations followed by a slow decrease at high glucose *** low glucose concentrations,the binding of glucose with PBA groups on the polymer chain increases the number of glucose molecules proximal to the polymer which influences the thermal behavior of the polymer,causing a rapid decrease in ***,the transition occurs at a glucose concentration equal to the reciprocal of the binding constant between PBA and glucose,thus providing a novel method to determine the binding *** saccharides,including mannose,galactose and fructose,also depress the LCST of P(NIPAM-co-2-AAPBA)copolymer in the same way.

关键词： glucose-sensitive mechanism phenylboronic acid thermosensitive binding constant lower critical solution temperature polymers

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A New Arrangement with Nonlinear Sidewalls for Tanker Ship Storage Panels

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Journal of Ocean University of China 2013年第1期12卷 23-31页

作者： M. J. Ketabdari h. Saghi Faculty of Marine Technology Amirkabir University of Technology department of Civil Engineering Ferdowsi University

Sloshing phenomenon in a moving container is a complicated free surface flow problem. It has a wide range of engineering applications, especially in tanker ships and Liquefied Natural Gas (LNG) carriers. When the tank in these vehicles is partially filled, it is essential to be able to evaluate the fluid dynamic loads on tank perimeter. different geometric shapes such as rectangular, cylindrical, elliptical, spherical and circular conical have been suggested for ship storage tanks by previous researchers. In this paper a numerical model is developed based on incompressible and inviscid fluid motion for the liquid sloshing phenomenon. The coupled BEM-FEM is used to solve the governing equations and nonlinear free surface boundary conditions. The results are validated for rectangular container using data obtained for a horizontal periodic sway motion. Using the results of this model a new arrangement of trapezoidal shapes with quadratic sidewalls is suggested for tanker ship storage panels. The suggested geometric shape not only has a maximum surrounded tank volume to the constant available volume, but also reduces the sloshing effects more efficiently than the existing geometric shapes.

关键词： tanker ships storage panels sloshing phenomenon quadratic sidewalls

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Probing the small-scale impact deformation mechanism in an aluminum single-crystal

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Journal of Materials Science & Technology 2024年第20期187卷 212-220页

作者： Kehua Wang Jian Chen Yanhuai Li Xiyu Zhang Ben.d.Beake Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing211189China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049China Micro Materials Ltd Willow HouseYale Business VillageEllice WayWrexhamLL137YLUK

Although the rate-dependence of metals has been widely researched,the deformation mechanism under small-scale impact conditions lacked exploration and in-depth *** quasi-static nanoin-dentation(strain rate,SR,d high strain-rate nano-impact(SR>10^(3)s^(-1))with a pyramidal Berkovich tip,this study investigates the influence of SR on the deformation response of an aluminium single crystal(110).The underlying microstructural variance was analyzed using on-axis TKd and *** results show that the impact deformation involves great elastic recovery and different substructural *** contrast to the uniform sub-grain substructure with medium and high-angle grain boundaries formed during quasi-static indentation,the substructure formed under impact has a more heterogeneous nature including microbands near the surface and sub-grains underneath with dominant low-angle grain *** significant change in substructure for the impact deformation comes from suppressed thermally activated dislocation motion,leading to the conversion of dislocation glide from wave-like(quasi-static)to planar regime(impacting),and the insufficient rearrangement of geomet-rically necessary dislocations(GNds).The heterogeneous microstructure develops due to the competition between high strain-rate-induced planar-slip and strain gradient-induced GNd rearrangement,as well as the uneven distribution of SR and strain ***,the underlying incipient mechanism of the microband is proposed,in which successive primary dislocations are nucleated at the surface and glide perpendicular to flanks to pile ***,the influence of SR on indentation size effects is discussed.

关键词： Nanoindentation Nano-impact Microstructure Aluminum single crystal Microbands dislocations

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Seismic Analysis of Reinforced Concrete Silos under Far-Field and Near-Fault Earthquakes

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Structural durability & health Monitoring 2022年第3期16卷 213-233页

作者： Anwer h.hussein hussam K.Risan department of Civil Engineering Al-Nahrain UniversityBaghdad10072Iraq

Silos are strategical structures used to stockpile various types of granular *** are highly vulnerable to earthquake excitation and have been frequently reported to fail at a higher rate than any other industrial *** seismic response of silos within the near-fault region will suffer a complex combination of loadings due to the unique characteristics of the near-fault ground motions;which are usually associated with a large amplitude pulse at the beginning of either the velocity or the displacement time *** study aims to numerically evaluate the seismic response of reinforced concrete cylindrical silos under near-fault ground motions(NFGM)and far-field ground motions(FFGM).The assessment investigates the impact of the slenderness ratio and the para-meters’influence on the seismic behavior of reinforced concrete *** validity of the Eurocode provisions in the structural safety of silos will also be *** nonlinear time history analysis is carried out through the finite element approach by examining four silos with different slenderness *** concrete damage plas-ticity model is assigned to the silo wall to simulate the nonlinear behavior of concrete in the plastic zone;while,the behavior of the stored material is represented by the drucker-Prager plastic *** wall-granular material interaction is considered and defined by coulomb’s friction *** results of the near-fault records reveal a growth up to 72.8%in the hoop stress and 160.4%in the vertical stress compared to the far-field ***,the seismic response of reinforced concrete silos is highly sensitive to the type of ground motion,and slender silos tend to impose greater structural demand under the ***,The Eurocode-8 seismic provisions were adequate in the conventional far-field ground motions and less effective in the near-fault zone.

关键词： Silos seismic analysis near-fault earthquake far-field earthquake

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Properties of n-type SnO_2 semiconductor prepared by spray ultrasonic technique for photovoltaic applications

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Journal of Semiconductors 2015年第12期36卷 34-37页

作者： h.Bendjedidi A.Attaf h.Saidi M.S.Aida S.Semmari A.Bouhdjar Y.Benkhetta Laboratoire de Physique des Couches Minces et Applications Université de Biskra Laboratoire des Couches minces et Interfaces Université Mentouri

Transparent conducting n-type SnO2 semiconductor films were fabricated by employing an inexpensive, simplified spray ultrasonic technique using an ultrasonic generator at deferent substrate temperatures （300, 350, 400, 450 and 500 ℃）. The structural studies reveal that the SnO2 films are polycrystalline at 350,400, 450, 500 ℃ with preferential orientation along the （200） and （101） planes, and amorphous at 300 ℃. The crystallite size of the films was found to be in the range of 20.9-72.2 nm. The optical transmittance in the visible range and the optical band gap are 80% and 3.9 eV respectively. The films thicknesses were varied between 466 and 1840 nm. The resistivity was found between 1.6 and 4 × 10^-2 Ω.cm. This simplified ultrasonic spray technique may be considered as a promising alternative to a conventional spray for the massive production of economic SnO2 films for solar cells, sensors and opto-electronic applications.

关键词： tin oxide thin films spray ultrasonic structural properties optical properties

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SYNThESIS ANd ThERMAL STABILITY OF NANOCOMPOSITE nc-TiN/a-TiB_2 ThIN FILMS

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 307-312页

作者： Y.h.Lu Z.F.Zhou P.Sit Y.G.Shen K.Y.Li h.Chen departmentofPhysicsandMaterialsScience CityUniversityofHongKongKowloonHongKongChina／／DepartmentofManufacturingEngineeringg~EngineeringManagementCityUniversityofHongKongKowloonHongKongChina departmentofManufacturingEngineering＆EngineeringManagement CityUniversityofHongKongKowloonHongKongChina departmentofPhysicsandMaterialsScience CityUniversityofHongKongKowloonHongKongChina

Several nc-TiN/a-TiB2 thin films comprised of nanocrystalline (nc-) TiN and amor phous (a-) TiB2 phases were deposited on Si(100) at room temperature by reactive unbalanced dc magnetron sputtering, followed by vacuum annealed at 400, 600, 80 0 and 1000℃ for 1h, respectively. Effects of B content on microstructure, mecha nical behaviors and thermal microstructure stability have been investigated by X -ray diffraction (XRd), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and nanoindentation measurements. The results indicated that B addition greatly affected both microstructure and mechanical behavior of nc-Ti N/a-TiB2 thin films. With increasing B content the grain size decreased. A maxim um hardness value of about 33GPa was obtained at B content of about 19at.%. The improved mechanical properties of nc-TiN/a-TiB2 films with the addition of B int o TiN were attributed to their densified microstructure with development of fine grain size. Only addition of sufficient B could restrain grain growth during an nealing. high B content resulted in high microstructure stability. The crystalli zation of amorphous matrix occurred at about 800℃, forming TiB or TiB2 crystall ite, depending on B content. Before that no change in bonding configuration was found.

关键词： annealing boron reactive unbalanced dc magnetron sputtering ther mal stability nc-TiN/a-TiB2 thin film

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Asymptotic Analysis of a Bingham Fluid in a Thin domain with Fourier and Tresca Boundary Conditions

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Advances in Applied Mathematics and Mechanics 2014年第6期6卷 797-810页

作者： M.dilmi h.Benseridi A.Saadallah department of Mathematics Faculty of Maths and InfsM’sila University28000Algeria AppliedMathematics Laboratory Department ofMathematicsSetif I-University19000Algeria

In this paper we prove first the existence and uniqueness results for the weak solution,to the stationary equations for Bingham fluid in a three dimensional bounded domain with Fourier and Tresca boundary condition;then we study the asymptotic analysis when one dimension of the fluid domain tend to *** strong convergence of the velocity is proved,a specific Reynolds limit equation and the limit of Tresca free boundary conditions are obtained.

关键词： Free boundary problems Bingham fluid asymptotic approach Tresca law Reynolds equation.

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From Neurons to Cognition:Technologies for Precise Recording of Neural Activity Underlying Behavior

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Biomedical Engineering Frontiers 2020年第1期1卷 64-83页

作者： Richard h.Roth Jun B.ding department of Neurosurgery Stanford UniversityStanfordCA 94305USA department of Neurology and Neurological Sciences Stanford UniversityStanfordCA 94305USA

Understanding how brain activity encodes information and controls behavior is a long-standing question in *** complex problem requires converging efforts from neuroscience and engineering,including technological solutions to perform high-precision and large-scale recordings of neuronal activity in vivo as well as unbiased methods to reliably measure and quantify *** to advances in genetics,molecular biology,engineering,and neuroscience,in recent decades,a variety of optical imaging and electrophysiological approaches for recording neuronal activity in awake animals have been developed and widely applied in the ***,sophisticated computer vision and machine learning algorithms have been developed to analyze animal *** this review,we provide an overview of the current state of technology for neuronal recordings with a focus on optical and electrophysiological methods in *** addition,we discuss areas that future technological development will need to cover in order to further our understanding of the neural activity underlying behavior.

关键词： recording lying technological

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Pulsed light processing of foods for microbial safety

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Food Quality and Safety 2017年第3期1卷 187-201页

作者： M.L.Bhavya h.Umesh hebbar department of Technology Scale-up CSIR-Central Food Technological Research InstituteMysoreIndia.

The demand for processed foods and the awareness about food quality and safety are increasing *** consumers’demand for minimally processed foods and growing competition in the market have made the processors to adopt newer non-thermal technologies that preserve nutrients and sensory properties of the ***,heat processing of foods is carried out to convert raw material into value-added product,reduce or eliminate microbial load to improve safety,and extend shelf *** of the limitations of thermal processing techniques can be overcome by employing non-thermal *** hydrostatic pressure,pulsed electric field,ultrasound,cold plasma,dense phase carbon dioxide,ozone,and pulsed light(PL)processing are gaining popularity in food *** technology is a non-thermal technology,where sterilization and decontamination are achieved by impinging high-intensity light pulses of short durations on surfaces of foods and high-transmission *** a few reports on the PL technology are available,in-depth studies on this are needed to adopt at a commercial *** present review provides an overview of light-based processing of foods and covers important aspects such as different PL systems used for processing of foods,mode of action of PL on microbes,the effect of PL on liquid foods,surface decontamination of foods and parameters that affect PL efficacy,combination processing with *** the growing demand in non-thermal processing for the technological advancement in the area of generation of light,light-based processing will be a promising technology for microbial load reduction.

关键词： Pulsed light Food safety Non-thermal processing Minimally processed Microbial load.

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Bioactive compounds and volatile aroma compounds in rose(Rosa damascena Mill.)vinegar during the aging period

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Food Bioscience 2022年第6期50卷 636-645页

作者： NilgünÖzdemir Nilgün h.Budak department of Food Engineering Faculty of EngineeringOndokuz Mayis UniversitySamsunTurkey department of Food Processing Egirdir Vocational SchoolIsparta University of Applied SciencesIspartaTurkey

Rose *** a plant genus popular in the perfume,and fragrance industries It is also employed in cosmetic and pharmaceutical industries due to its anti-aging,anti-depressant,anti-cancer,and anti-microbial ***,it is used in the food industry to produce marmalade,syrup,tea,jam,***,there is no food form in which rose is used as a raw material in which no heat is applied and does not contain sugar so that its bioactive compounds can be released in the best *** this manner,producing vinegar may be a suitable ***,this study aimed to reveal the antioxidant capacity,organic-acid,phenolic,and volatile-aroma compounds of rose vinegar as an novel food and the changes of them during the 3-year-aging-period were investigated In the study,the phenolics of the rose vinegar were mainly comprised gallic-acid and catechin,followed by chlorogenic acid,apigenin,quercetin,and *** total phenolic-compound content and the antioxidant activity had high a *** prominent volatile aroma compounds were rose-oxide,acetic-acid,2-phenethanol,octanoic-acid,ethyl-phenylacetate,isoamyl-acetate,phenylacetic-acid,acetoin,linalool,ethyl-acetate,β-*** most appropriate duration was determined to be 2 *** results showed that the rose plant was suitable for vinegar ***,a new food produced from the petals of a flower with positive health properties was *** resulting product was found to be suitable for industrial ***,novel and important information was obtained for producers who want to produce rose vinegar on the industrial scale on this subject.

关键词： Rosa damascena Mill Rose vinegar Bioactive compounds Volatile aroma compounds Aging Maturation

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