检索结果-南通市图书馆

CO_2 adsorption using TiO_2 composite polymeric membranes:A kinetic study

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第9期27卷 163-171页

作者： Sarah Hafeez X.Fan Arshad Hussain C.F.mart.n School of Chemical and Materials Engineering (SCME) National University of Sciences & Technology Institute for Materials and Processes School of Engineering University of Edinburgh University of Aberdeen School of Engineering Fraser Noble Building King's College

CO2is the main greenhouse gas which causes global climatic changes on larger scale. Many techniques have been utilised to capture CO2. Membrane gas separation is a fast growing CO2 capture technique, particularly gas separation by composite membranes. The separation of CO2 by a membrane is not just a process to physically sieve out of CO2 through the controlled membrane pore size. It mainly depends upon diffusion and solubility of gases, particularly for composite dense membranes. The blended components in composite membranes have a high capability to adsorb CO2. The adsorption kinetics of the gases may directly affect diffusion and solubility. In this study, we have investigated the adsorption behaviour of CO2 in pure and composite membranes to explore the complete understanding of diffusion and solubility of CO2 through membranes. Pure cellulose acetate（CA） and cellulose acetatetitania nanoparticle（CA-TiO2） composite membranes were fabricated and characterised using SEM and FTIR analysis. The results indicated that the blended CA-TiO2 membrane adsorbed more quantity of CO2 gas as compared to pure CA membrane. The high CO2 adsorption capacity may enhance the diffusion and solubility of CO2 in the CA-TiO2 composite membrane, which results in a better CO2 separation. The experimental data was modelled by Pseudo first-order, pseudo second order and intra particle diffusion *** to correlation factor R2, the Pseudo second order model was fitted well with experimental data. The intra particle diffusion model revealed that adsorption in dense membranes was not solely consisting of intra particle diffusion.

关键词： Global warming Cellulose acetate Gas adsorption Pseudo order models CO2 Ti O2

MCRO-PUF:A novel Modified Crossover RO-PUF with an Ultra-Expanded CRP Space

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第3期74卷 4831-4845页

作者： Hassan Rabiei Masoud Kaveh Mohammad Reza Mosavi Diego mart.n Department of Electrical Engineering Iran University of Science and TechnologyTehran13114-16846Iran Department of Communication and networking Aalto UniversityEspoo00076Finland ETSI de Telecomunicación Universidad Politécnica de MadridAv.Complutense 30Madrid28040Spain

With the expanding use of the Internet of Things(IoT)devices and the connection of humans and devices to the Internet,the need to provide security in this field is constantly *** conventional cryptographic solutions need the IoT device to store secret keys in its non-volatile memory(nVM)leading the system to be vulnerable to physical *** addition,they are not appropriate for IoT applications due to their complex ***,physically unclonable functions(PUFs)have been introduced to simultaneously address these *** are lightweight and easy-toaccess hardware security primitives which employ the unique characteristics of integrated circuits(ICs)to generate secret *** all proposed PUFs,ring oscillator PUF(RO-PUF)has had amore suitable structure for hardware implementation because of its high reliability and easier providing of circuital ***,RO-PUF has not been so attractive for authentication purposes due to its limited supported challenge-response pairs(CRPs).A few efforts have been made in recent years that could successfully improve the RO-PUF CRP space,such as configurable RO-PUF(CRO-PUF).In this paper,by considerably improving the CRO-PUF structure and adding spare paths,we propose a novel strong RO-PUF structure that exponentially grows the CRP space and dramatically reduces the hardware *** implement our design on a simple and low-cost FPGA chip named XC6SLX9-2tqg144,stating that the proposed design can be used in IoT *** addition,to improve the CRP space,our design creates a suitable improvement in different security/performance terms of the generated responses,and dramatically outperforms the *** average reliability,uniqueness,and uniformity of the responses generated are 99.55%,48.49%,and 50.99%,respectively.

关键词： RO-PUF CRP space configurable design

COX-2 in liver,from regeneration to hepatocarcinogenesis:What we have learned from animal models?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2010年第12期16卷 1430-1435页

作者： Paloma mart.n-Sanz Rafael Mayoral marta Casado Lisardo Boscá Biomedical network Center for the Study of Hepatic and Digestive Diseases(CIBERehd) Department of Metabolism and Cell Signaling Institute of Biomedical Research "Alberto Sols"(CSIC-UAM) Department of Pathology and Molecular and Cellular Therapy Institute of Biomedicine of Valencia(IBV-CSIC)

The use of animals lacking genes or expressing genes under the control of cell-specific promoters has signifi cantly increased our knowledge of the genetic and molecular basis of physiopathology,allowing testing of functional hypotheses and validation of biochemical and pharmacologic approaches in order to understand cell ***,with unexpected frequency,gene knockout animals and,more commonly,animal models of transgenesis give experimental support to even opposite conclusions on gene *** we summarize what we learned on the role of cyclooxygenase 2(COX-2) in liver and revise the results obtained in 3 independent models of mice expressing a COX-2 transgene specifi cally in the *** challenge with pro-inflammatory stimuli,the animals behave very differently,some transgenic models having a protective effect but others enhancing the *** addition,one transgene exerts differential effects on normal liver physiology depending on the transgenic animal model used.

关键词： Cyclooxygenase 2 Prostaglandins Liver diseases Apoptosis Inflammation Animal models

On the non-evolution of the dependence of black hole masses on bolometric luminosities for QSOs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2012年第3期12卷 249-259页

作者： mart.n López-Corredoira Carlos M. Gutirrez Instituto de Astrofísica de Canarias Departamento de Astrofísica Universidad de La Laguna

There are extremely luminous quasi stellar objects （QSOs） at high redshift which are absent at low redshift. The lower luminosities at low redshifts can be understood as the external manifestation of either a lower Eddington ratio or a lower mass. To distinguish between both effects, we determine the possible dependence of masses and Eddington ratios of QSOs with a fixed luminosity as a function of redshifts; this avoids the Malmquist bias or any other selection effect. For the masses and Eddington ratios derived for a sample of QSOs in the Sloan Digital Sky Survey, we model their evolution by a double linear fit separating the dependence on redshifts and luminosities. The validity of the fits and possible systematic effects were tested by the use of different estimators of masses or bolometric luminosities, and possible intergalactic extinction effects. The results do not show any significant evolution of black hole masses or Eddington ratios for equal luminosity QSOs. The black hole mass only depends on the bolometric luminosity without significant dependence on the redshift as （M BH/10 9 M ）≈ 3.4 （L bol/10 47 erg s-1）0.65 on average for z ≤ 5. This must not be confused with the possible evolution in the formation of black holes in QSOs. The variations of the environment might influence the formation of the black holes but not their subsequent accretion. It also leaves a question to be solved： Why are there not QSOs with very high mass at low redshift？ A brief discussion of the possible reasons for this is tentatively pointed out.

关键词： accretion—methods: statistical—quasars: general

Using lysosomal membrane stability of haemocytes in Ruditapes philippinarum as a biomarker of cellular stress to assess contamination by caffeine, ibuprofen, carbamazepine and novobiocin

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2013年第7期25卷 1408-1418页

作者： Gabriela V. Aguirre-mart.nez Sara Buratti Elena Fabbri Angel T. DelValls M. Laura mart.n-Díaz Unitwin/Unesco/WiCoP Physical Chemistry Department University of Cdiz Faculty of Marine and Environmental SciencesPolígono Río San Pedro s/n 11510 Puerto Real Cdiz Spain Andalusian Center for Marine Science and Technology (CACYTMAR) Campus Universitariode Puerto Real11510 Puerto Real Cdiz Spain University of Bologna Interdepartment Centre for Research in Environmental Sciences (CIRSA)via S. Alberto 16348123 Ravenna Italy

Although pharmaceuticals have beendetected in the environment only in the range from ng/L to μg/L, it has beendemonstrated that they can adversely affect the health status of aquatic organisms. Lysosomal membrane stability （LMS） has previously been applied as an indicator of cellularwell-being todetermine health status in bivalve mussels. The objective of this study is to evaluate LMS in Ruditapes philippinarum haemolymph using the neutral red retention assay （nRRA）. Clamswere exposed in laboratory conditions to caffeine （0.1, 5, 15, 50 μg/L）, ibuprofen （0.1, 5, 10, 50 μg/L）, carbamazepine and novobiocin （both at 0.1, 1, 10, 50 μg/L） for35days. Results show adose-dependent effect of the pharmaceuticals. The neutral red retention time measured at the end of the bioassaywas significantly reduced by 50% after exposure to environmental concentrations （p 〈 0.05）（caffeine = 15 μg/L; ibuprofen = 10 μg/L; carbamazepine = 1 μg/L and novobiocin = 1 μg/L）, compared to controls. Clams exposed to these pharmaceuticalswere considered to present adiminished health status （retention time 〈45 min）, significantlyworse than controls （96 min）（p 〈 0.05）. The predicted no environmental effect concentration （PnEC） results showed that these pharmaceuticals are very toxic at the environmental concentrations tested. Measurement of the alteration of LMS has been found to be a sensitive technique that enables evaluation of the health status of clams after exposure to pharmaceuticals under laboratory conditions, thus representing a robust Tier-1 screening biomarker.

关键词： neutral red pharmaceuticals bioassay haemolymph bivalves health status Manila clam

Importance of BRCA mutation for the current treatment of pancreatic cancer beyond maintenance

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2021年第39期27卷 6515-6521页

作者： Joaquina mart.nez-Galán Isabel Rodriguez Octavio Caba Department of Medical Oncology Virgen de las Nieves University HospitalGranada 18014Spain Institute of Biopathology and Regenerative Medicine(IBIMER) University of GranadaGranada 18016Spain

In this editorial,we comment on pancreatic cancer(PC),one of the most aggressive and lethal *** minimal improvements in survival rates have been achieved over recent *** chemotherapeutic regimens have little impact,and surgical resection remains the only reliable curative *** address current treatment options for these patients,focusing on the usefulness of breast cancer(BRCA)gene mutation as a prognostic biomarker and predictor of response to *** survival outcomes have been reported in patients with PC and mutant BRCA gene treated with first-line platinum-based ***,it appears appropriate to include BRCA gene status among clinical criteria used to select the chemotherapy *** addition,maintenance treatment with poly(ADP-ribose)polymerase inhibitors has been found to improve progression-free survival in patients with PC and mutated BRCA whose disease does not progress after first-line platinum-based *** combination has therefore been proposed as the optimal treatment regimen for these patients.

关键词： Pancreatic cancer Treatment BRCA Mutation Poly(ADP-ribose)polymerase inhibitor Maintenance

Engineered biomimicry for harvesting solar energy:a bird’s eye view

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Smart and nano Materials 2013年第2期4卷 83-90页

作者： Raúl J.mart.n-Palma Akhlesh Lakhtakia Materials Research Institute The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Engineering Science and Mechanics The Pennsylvania State UniversityUniversity ParkPA 16802USA

All three methodologies of engineered biomimicry–bioinspiration,biomimetics,and bioreplication–are represented in current research on harvesting solar *** processes and porous surfaces inspired by plants and certain marine animals,respectively,are being investigated for solar *** dye-sensitized solar cells deploy artificial photosynthesis,bioinspired nanostructuring of materials in solar cells improves *** textured coatings for solar cells have been shown to reduce optical reflectance and increase optical absorptance over a broad spectral *** lenses fabricated by a bioreplication technique offer similar promise for reduced reflectance by increasing the angular field of view.

关键词： bioinspiration biomimetics bioreplication solar cell artificial photosynthesis antireflective coating engineering biomimicry

Health care data analysis and visualization using interactive data exploration for sportsperson

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2022年第6期65卷 85-97页

作者： Hao LIU Yang ZHAnG Ke LIAn Yifei ZHAnG Oscar Sanjuán mart.nEZ Rubén González CRESPO Department of Sport and Exercise Sciences Kunsan National University Department of naval Architecture and Ocean Engineering Ludong University Computer Science Department School of Engineering and Technology Universidad Internacional de La Rioja

Sports have scored significant attention among the public in this multifaceted world. Diverse training strategies are followed by many athletics and even flexible to adapt comfortable and optimal techniques. This fact has led physicians and educators to encourage remote health surveillance as one of the core strategies in athletic training. The need for innovative data exploration methodologies capable of facing Big Data’s influence to make remote monitoring services viable has been raised by the growing ties of networks that deliver high quantities of real-time data. This paper presents an interactive healthcare data exploration and visualization(IHDEV) model to enhance multi-scaling data analysis and visualization in the athletic health vision platform. This paper aims to simplify optimization methods to measure sportsperson muscle tension. This model illustrates a three-layer architecture with a raw data acquisition layer, data analysis layer, and visualization layer. The first layer considers the acquisition of health-related data from the athletes for remote monitoring using IoT and stores it into the cloud. The data analysis layer adapts artificial intelligence(AI) in data mining. The final layer introduces an intelligent interactive data visualization model assisted by a reactive workflow mechanism, enabling analysis and visualization solutions to be composed in a personalized data flow appropriate to the athletic training. This experimental study extended with two healthcare datasets to show the feasibility of IHDEV in promoting healthcare based athletic monitoring and improves the accuracy ratio of 96.7%, prediction ratio of 96.2%, an efficiency ratio of 96.8%, Pearson correlation coefficient of 98.2%, and reduces the error rate of 18.7% compared to other conventional models.

关键词： artificial intelligence health monitoring data visualization data analysis athletics

Structural Characterization of Laser Bonded Sapphire Wafers Using a Titanium Absorber Thin Film

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2015年第5期31卷 484-488页

作者： A.de Pablos-mart.n S.Tismer Th.Hche Fraunhofer Institute for Mechanics of Materials IWM Walter-Hlse-Str.106120 HalleGermany

Two sapphire substrates were tightly bonded by irradiation with a 1064 nm nanosecond laser and using a sputtered 50 nm-titanium thin film as an absorbing *** laser irradiation,aluminum from the upper substrate is incorporated into the thin film,forming Ti-Al-O *** the irradiated region becomes transparent,the bond quality was evaluated by scanning acoustic microscopy.

关键词： Laser welding Absorbing film Sapphire wafer bondin