检索结果-南通市图书馆

Evaluation of influence of cold atmospheric pressure argon plasma operating parameters on degradation of aqueous solution of Reactive Blue 198(RB-198)

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2020年第5期22卷 114-125页

作者： K NAvANEETHA PANDIYARAJ D vASU P v A PADmANABHAN m PICHUmANI R R DESHmUKH v KANDAvELU Research Division of Plasma Processing(RDPP) Department of PhysicsSri Shakthi Institute of Engineering and TechnologyChinniyam Palayam(post)Coimbatore-641062India Department of Nanoscience and Technology Sri Ramakrishna Engineering CollegeCoimbatore-641022India Department of Physics Institute of Chemical TechnologyMatungaMumbai 400019India Department of Chemistry Sri Shakthi Institute of Engineering and TechnologyL&T bypassChinniyam Palayam(post)Coimbatore-641062India

The intention of this work is to remove Reactive Blue 198(RB-198)dye components from simulated water solution using cold atmospheric pressure argon plasma *** solutions of RB-198 dye were treated as a function of various operating parameters such as applied potential,reaction time and distance between the plasma jet and surface of the *** efficiency of the degradation of RB-198 molecules was explored by means of Uv-vis *** reactive species involved during the treatment process were examined by optical emission spectra(OES).The present hydroxyl radicals(OH·radical)and hydrogen peroxide(H2O2)in the plasma-treated aqueous dye solutions were investigated using various spectroscopic *** other parameters such as total organic carbon(TOC),conductivity and p H were also *** toxicity of plasma-treated RB-198 solution was finally studied by diffusion bacterial analysis and by tracking seed germination *** results show that a higher degradation percentage of99.27%was acquired for the RB-198 treated at higher reaction time and applied potential,and shorter distance between the plasma jet and water *** may be due to the formation of various reactive oxygen(OH·radical,atomic oxygen(O)and H2O2)and nitrogen species(nitric oxide(NO)radicals and N2 second positive system(N2 SPS))during the processes as confirmed by OES analysis and other spectroscopy ***(17.7%-81.8%)and pH(7.5-3.4)values of the plasma-treated RB-198 decreased significantly with respect to various operation parameters,which indicates the decomposition of RB-198 molecules in the aqueous ***,the conductivity of plasma-treated RB-198 aqueous solutions was found to have increased linearly during the plasma treatment due to the formation of various ionic species in aqueous *** toxicity analysis clearly exhibits the non-toxic behavior of plasma-treated RB-198 aqueous solution towards the bacterial growth and germination of see

关键词： RB-198 degradation non-toxicity cold atmospheric pressure plasma jet

在线全文

学校读者我要写书评

暂无评论

发动机效率及后处理技术进展综述

内燃机工程 2021年第5期42卷 86-108页

作者： Ameya Joshi Timothy v.johnson 康宁公司美国纽约州康宁市14831

全面综述了过去几年汽车尾气温室气体和标准污染物减排的一些主要进展,讨论了针对改进发动机及后处理系统最新出台和即将出台的法规及正在研发的技术。介绍了轻型和重型车辆的全球主要市场的发展,及相关的法规和技术。

关键词：内燃机效率后处理排放

Controlled Wettability of Polymers via Environmental Crazing

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2022年第10期40卷 1307-1314,I0012页

作者： Alena Yu.Yarysheva Larisa m.Yarysheva Fedor v.Drozdov Olga v.Arzhakova Aziz m.muzafarov Faculty of Chemistry Lomonosov Moscow State UniversityLeninskieGory 1-3Moscow 119991Russia Institute of Synthetic Polymer materials RAS ul.Profsoyuznaya 70Moscow 117393Rusia

This work highlights the benefits of environmental crazing for the control over the hydrophilic-lipophilic balance of glassy amorphous and semicrystalline polymers:poly(ethylene terephthalate)(PET)and biodegradable polycaprolactone(PCL).Task-oriented encapsulation of diverse commercial and natural hydrophilic(polyethyleneoxide,polyvinylpyrrolidone,gelatin)and hydrophobic guest additives(perfluoroorgano siloxanes,water-repellent impregnation)into mesoporous host polymer(PET,PCL)matrixes allows targeted control over the wettability of the resultant nanocomposite *** on the nature of the guest additive,the properties of the modified polymers can be varied from hydrophilic to hydrophobic:contact angle(CA)of PET can be adjusted from 47_(⊥)/38_(||)to 130_(⊥)/117_(||)°(for initial PET,CA=82°)and CA of PCL from 40°to 114°(for initial PCL CA=75°).The unique benefits of environmental crazing for structural modification are related to the universal character of this approach which can be applied to a broad range of polymers and allows preparation of diverse high-performance materials with tunable hydrophilic-lipophilic balance.

关键词： Wettability Hydrophilic-hydrophobic balance Contact angle Environmental crazing Poly(ethylene terephthalate) Polycaprolactone

Post-Late Paleozoic Collisional Framework of Southern Great Altai

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2012年第5期86卷 1093-1104页

作者： Boris m. CHIKOv Sergei v. ZINOvIEv Еugene v. DEYEv Institute of Geology Siberian Branch of Russian Academy of Sciences Novosibirsk 630090 Russia

We outline the post-Late Paleozoic （latest Permian to Cenozoic） collisional framework of the southern Great Altai （Central Asia） produced by the convergence between the Tuva-mongolia and Junggar continental terranes （microplates）. The collisional structures in the region classified on the basis of their geometry and deformation style, dynamic metamorphism, and compositions of tectonites are of three main types：（1） mosaic terranes made up of large weakly deformed Paleozoic blocks separated by younger shear zones; （2） contractional deformation systems involving structures formed in post-Late Paleozoic time, parallel faults oriented along collisional deformation systems, and relict lenses of Paleozoic orogenic complexes; and （3） isolated zones of dynamic metamorphism composed mostly of collisional tectonites different in composition and alteration grade.

关键词： continental collision post-Late Paleozoic events tectonic framework dynamic metamorphism Altai Central Asia

BDNF Overexpression Enhances the Preconditioning Effect of Brief Episodes of Hypoxia,Promoting Survival of GABAergic Neurons

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2020年第7期36卷 733-760页

作者： m.v.Turovskaya S.G.Gaidin m.v.vedunova A.A.Babaev E.A.Turovsky Institute of Cell Biophysics of the Russian Academy of Sciences Federal Research Center“Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences”PushchinoRussia Institute of Biology and Biomedicine Lobachevsky State University of Nizhny NovgorodNizhny NovgorodRussia

Hypoxia causes depression of synaptic plasticity,hyperexcitation of neuronal networks,and the death of specific populations of ***,brief episodes of hypoxia can promote the adaptation of *** preconditioning is well manifested in glutamatergic neurons,while this adaptive mechanism is virtually suppressed in GABAergic ***,we show that brain-derived neurotrophic factor(BDNF) overexpression in neurons enhances the preconditioning effect of brief episodes of *** amplitudes of the NmDAR-and AmPARmediated Ca2+ responses of glutamatergic and GABAergic neurons gradually decreased after repetitive brief hypoxia/reoxygenation cycles in cell cultures transduced with the(AAv)-Syn-BDNF-EGFP virus *** contrast,the amplitudes of the responses of GABAergic neurons increased in non-transduced cultures after *** decrease of the amplitudes in GABAergic neurons indicated the activation of mechanisms of hypoxic *** suppressed apoptotic or necrotic cell *** effect was most pronounced in cultures with BDNF overe *** of BDNF abolished the effect of preconditioning and promoted the death of GABAergic ***,the expression of the anti-apoptotic genes Stat3,Socs3,and Bcl-x1 substantially increased 24 h after hypoxic episodes in the transduced cultures compared to *** expression of genes encoding the pro-inflammatory cytokines IL-10 and IL-6 also *** turn,the expression of pro-apoptotic(Bax,Casp-3,and Fas) and proinflammatory(IL-1β and TNFα) genes decreased after hypoxic episodes in cultures with BDNF *** of vesicular BDNF release abolished its protective action targeting inhibition of the oxygen-glucose deprivation(OGD)-induced [Ca2+]i increase in GABAergic and glutamatergic neurons,thus promoting their *** A1,Brefeldin A,and tetanus toxin suppressed vesicular release(including BDNF) and shifted the gene expression pr

关键词： Hypoxia Neuron BDNF Preconditioning Calcium Receptors

Quantum-dot microlasers based on whispering gallery mode resonators

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2021年第5期10卷 785-795页

作者： A.E.Zhukov N.v.Kryzhanovskaya E.l.moiseev m.v.maximov Laboratory of quantum optoelectronics National Research University Higher School of EconomicsKantemirovskaya 3ASt.Petersburg 194100Russia Nanophotonics laboratory Alferov UniversityKhlopina 8/3St.Petersburg 194021Russia

The subject of this paper is microlasers with the emission spectra determined by the whispering gallery *** to the total internal reflection of light on the sidewalls,a high Q-factor is achieved until the diameter is comparable to the *** light emission predominantly occurs in the plane of the structure,which facilitates the microlaser integration with other *** focus on microdisk lasers with various types of the In(Ga)As quantum dots(QDs).Deep localization of charge carriers in spatilly separated regions suppresses the lateral diffusion and makes it possible to overcome the undesirable effect of non-adiative recombination in deep ***,using conventional epitaxial structures and relatively simple post-growth processing methods,it is possible to realize small microlasers capable of operating without temperature stabilization at elevated *** low sensitivity of QDs to epitaxial and manufacturing defects allows fabricating microlasers using IIv heterostructures grown on silicon.

关键词： Quantum mode overcome

Results of the main Phase of Ion Separation in the Process of Plasma-Optical mass Separation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2015年第10期17卷 862-868页

作者： v.m.BARDAKOv S.D.IvANOv A.v.KAZANTSEv N.A.STROKIN Institute for Physics and Technology Irkutsk State Technical University

This paper presents separation results of a mixture of nitrogen, argon and krypton ions in the process of plasma-optical mass separation on the POmS-E-3 separator model. We determined the behavior of the separation with a change in the value of magnetic field induction in the azimuthator and in the degree of compensation of the spatial charge in ion flows. An analysis is performed for experimental data by correlation with the results of a theoretical study and numerical experiments. The objectives of future experiments are outlined.

关键词： plasma-optical mass separation plasma accelerator trajectories spatial charge

Role of monovalent co-dopants on the PL emission properties of YAl_3(BO_3)_4:Ce^(3+) phosphor

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2014年第10期32卷 927-932页

作者： R.Satheesh Kumar v.Ponnusamy v.Sivakumar m.T.Jose Department of Physics Anna UniversityM.I.T. Campus Research and Development Laboratory Department of PhysicsSaveetha Engineering College Radiological Sefety Division Indira Gandhi Centre for Atomic Research

The cerium （Ce3＋） doped yttrium aluminium borate （YAB） phosphor was synthesized by modified solid state reaction. The phosphor＇s phase purity and its emission properties were studied using powder X-ray diffraction pattern and photoluminescence spectroscopy. The synthesized YAB had rhomobohedral crystal structure. The phosphor had two different excitation and emission spectra. By 325 nm excitation, the phosphor had emission at 373 nm and with 363 nm excitation; the phosphor gave violet-blue emission at 418 nm. The Uv emission of the phosphor originated due to Ce3＋ ions at the yttrium site and violet-blue emission owing to Ce3＋ ions at non-regular sites viz., A13＋ and interstitial sites. The emission intensity of the phosphor was enhanced when monovalent ions （K＋, Na＋, and F） were added as co-dopants. The crucial role of ionic radii of monovalent co-dopants on the emission enhancement of the YAB：Ce3＋ phosphor was reported. Thermogravimetric study showed that the YAB possessed high thermal stability at up to 900 ℃.

关键词： yttrium aluminium borate cerium monovalent codopants ionic radii thermogravimetric analysis rare earths

Cellulose-based composite scaffolds for bone tissue engineering and localized drug delivery

在线全文

学校读者我要写书评

暂无评论

Bioactive materials 2023年第2期20卷 137-163页

作者： mahsa Janmohammadi Zahra Nazemi Amin Orash mahmoud Salehi Amir Seyfoori johnson v.John mohammad Sadegh Nourbakhsh mohsen Akbari Faculty of New Sciences and Technologies Semnan UniversitySemnanP.O.Box:19111-35131Iran Laboratory for Innovations in micro Engineering(LimE) Department of Mechanical EngineeringUniversity of Victori1Victori1BCV8P 5C2Canada Terasaki Institute for Biomedical Innovations Los AngelesCA90050USA Biotechnology Center Silesian University of TechnologyAkademicka 2A44-100GliwicePoland Faculty of materials and metallurgical Engineering Semnan UniversitySemnanP.O.Box:19111-35131Iran

Natural bone constitutes a complex and organized structure of organic and inorganic components with limited ability to regenerate and restore injured tissues,especially in large bone *** improve the reconstruction of the damaged bones,tissue engineering has been introduced as a promising alternative approach to the conventional therapeutic methods including surgical interventions using allograft and autograft *** composite scaffolds consisting of multifunctional biomaterials in combination with the cells and bioactive therapeutic agents have great promise for bone repair and *** and its derivatives are renewable and biodegradable natural polymers that have shown promising potential in bone tissue engineering ***-based scaffolds possess numerous advantages attributed to their excellent properties of non-toxicity,biocompatibility,biodegradability,availability through renewable resources,and the low cost of preparation and ***,cellulose and its derivatives have been extensively used for delivering growth factors and antibiotics directly to the site of the impaired bone tissue to promote tissue *** review focuses on the various classifications of cellulose-based composite scaffolds utilized in localized bone drug delivery systems and bone regeneration,including cellulose-organic composites,cellulose-inorganic composites,cellulose-organic/inorganic *** will also highlight the physicochemical,mechanical,and biological properties of the different cellulose-based scaffolds for bone tissue engineering applications.

关键词： Cellulose Cellulose derivatives Bone tissue engineering Drug delivery system