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Effect of Mixing Strategy on the Structure-Properties of the PLA/PBAT Blends Incorporated with CNC

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Journal of Renewable Materials 2022年第1期10卷 149-164页

作者： Deniz Sema Sarul Dogan arslan Emre Vatansever Yusuf Kahraman Ali Durmus Reza Salehiyan Mohammadreza Nofar Polymer Science and Technology Program Institute of Science and TechnologyIstanbul Technical UniversityIstanbul34469Turkey Metallurgical&Materials Engineering Department Faculty of Chemical and Metallurgical EngineeringIstanbul Technical UniversityIstanbul34469Turkey Department of Chemical Engineering Faculty of EngineeringIstanbul University-CerrahpasaIstanbul34320Turkey Department of Materials Research and Technology Luxembourg Institute of Science and TechnologyEsch-sur-Alzette4362Luxembourg

Polylactide(PLA)/poly(butylene adipate-co-terephthalate)(PBAT)blend nanocomposites including 3 wt%of cel-lulose nanocrystals(CNCs)were prepared by melt compounding method in a twin-screw extruder and an inter-nal *** nanocomposites were formulated by diluting three different masterbatches prepared by solution casting method that contained 7 wt%of *** masterbatches were:(m1)PLA/PBAT/CNC masterbatch;(m2)PLA/CNC masterbatch;and(m3)PBAT/CNC *** were to explore how different prepara-tion methods affect the dispersion and localization of CNC and hence the properties of PLA/PBAT/CNC blend *** electron microscopy(SEM)was used to study the structural changes of the *** properties of PLA/PBAT blends and PLA/PBAT/CNC blend nanocomposites were also *** the samples prepared by internal mixer,the rheological behavior of blend nanocomposite prepared through premixing of CNC particles with PLA showed a transition from liquid-like to a gel-like *** to the rheological results and differential scanning calorimetry(DSC)analysis,it was found that the CNC overall enhanced the viscoelastic properties of blends and improved the PLA crystallization,*** mechanical analysis(DMA)illustrated that the incorporation of CNC also enhanced the elastic modulus of PLA/PBAT blends specifically above the glass transition temperature of *** expected improvements in mechanical properties did not occur due to the possible existence of residual solvent in the blends.

关键词： Polylactide poly(butylene adipate-co-terephthalate) cellulose nanocrystals blend nanocomposite morphology rheology

Distance Matrix and Markov Chain Based Sensor Localization in WSN

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Computers, Materials & Continua 2022年第5期71卷 4051-4068页

作者： Omaima Bamasaq Daniyal Alghazzawi Surbhi Bhatia Pankaj Dadheech Farrukh arslan Sudhakar Sengan Syed Hamid Hassan Department of Computer Science Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddahSaudi Arabia Department of Information Systems Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddahSaudi Arabia Department of Information Systems College of Computer Science and Information TechnologyKing Faisal UniversitySaudi Arabia Department of Computer Science and Engineering Swami Keshvanand Institute of TechnologyManagement&GramothanJaipurRajasthanIndia University of Engineering and Technology LahorePakistan Department of Computer Science and Engineering PSN College of Engineering and TechnologyTirunelveliTamilnaduIndia

Applications based on Wireless Sensor Networks(WSN)have shown to be quite useful in monitoring a particular geographic area of *** geometries of the surrounding environment are essential to establish a successful WSN *** it is literally hard because constructing a localization algorithm that tracks the exact location of Sensor Nodes(SN)in a WSN is always a challenging *** this research paper,Distance Matrix and Markov Chain(DM-MC)model is presented as node localization technique in which Distance Matrix and Estimation Matrix are used to identify the position of the *** method further employs a Markov Chain Model(MCM)for energy optimization and interference *** are performed against two well-known models,and the results demonstrate that the proposed algorithm improves performance by using less network resources when compared to the existing *** probability is used in the Markova chain to sustain higher energy ***,the proposed Distance Matrix and Markov Chain model decrease energy use by 31%and 25%,respectively,compared to the existing DV-Hop and CSA *** experimental results were performed against two proven models,Distance VectorHop Algorithm(DV-HopA)and Crow Search Algorithm(CSA),showing that the proposed DM-MC model outperforms both the existing models regarding localization accuracy and Energy Consumption(EC).These results add to the credibility of the proposed DC-MC model as a better model for employing node localization while establishing a WSN framework.

关键词： Wireless sensor network resource optimization routing distance matrix Markov chain

Elemental composition of rice using calibration free laser induced breakdown spectroscopy

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Optoelectronics Letters 2019年第1期15卷 57-63页

作者： Abdul Jabbar Mahmood Akhtar arslan Ali Shaukat Mehmood Sidra Iftikhar Muhmmad Aslam Baig Department of Physics Mirpur University of Science and Technology National Centre for Physics

In this paper, we apply laser induce breakdown spectroscopy (LIBS) to determine the elemental composition of different parts(root, stem and seed) of the rice plant and determine their weighted concentration using calibration free laser induced breakdown spectroscopy (CF-LIBS) technique. Ca, Fe and K are identified as major elements, while C, Ti, Mg, Si, Li, Ba, Sr, Cr, Na and Al as minor elements. We also detect the H-alpha line of hydrogen in the spectrum and determine the electron number density. The electron number density and its behavior as a function of laser energy, laser wavelength and the detector position are investigated. The plasma temperatures of samples are determined, and the validity of the assumption of the local thermodynamic equilibrium (LTE) is discussed.

关键词： Elemental composition calibration breakdown spectroscopy

Photon attenuation parameters for some tissues from Geant4simulation, theoretical calculations and experimental data:a comparative study

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Nuclear Science and Techniques 2019年第6期30卷 78-87页

作者： Halil arslan Electrical and Electronics Engineering Sakarya University of Applied Sciences

Mass attenuation coefficients, effective atomic numbers, effective electron densities and Kerma relative to air for adipose, muscle and bone tissues have been investigated in the photon energy region from 20 keV up to 50 MeV with Geant4 simulation package and theoretical calculations. Based on Geant4 results of the mass attenuation coefficients, the effective atomic numbers for the tissue models have been calculated. The calculation results have been compared with the values of the Auto-Zeff program and with other studies available in the literature. Moreover, Kerma of studied tissues relative to air has been determined and found to be dependent on the absorption edges of the tissue constituent elements.

关键词： Attenuation coefficient Effective atomic number Geant4 simulation Tissue model

Serum beta 2-microglobulin as a biomarker in inflammatory bowel disease

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World Journal of Gastroenterology 2014年第31期20卷 10916-10920页

作者： Bülent Y|lmaz Seyfettin Kklü Osman Yüksel Serap arslan Department of Gastroenterology Faculty of Medicine Hacettepe University

AIM: To investigate the diagnostic utility of beta 2 microglobulin (B2-M) levels and analyze this correlation with the activity of inflammatory bowel disease (IBD).

关键词： Beta 2 microglobulin Ulcerative colitis Crohn disease Inflammatory bowel disease

Effect of rare earth elements and their oxides on tribo-mechanical performance of laser claddings:A review

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Journal of Rare Earths 2016年第6期34卷 549-564页

作者： M.M.Quazi M.A.Fazal A.S.M.A.Haseeb Farazila Yusof H.H.Masjuki A.arslan Department of Mechanical Engineering Faculty of EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia Center for Energy Science Uni-versity of Malaya50603 Kuala LumpurMalaysia Centre of Advanced Manufacturing and Material Processing(AMMP Centre) University of Malaya50603 Kuala LumpurMalaysia

Laser cladding is a promising photon-based surface engineering technique broadly utilized for fabricating harder and wear resistant composite coatings. In spite of excellent properties, the practical applications of laser claddings are relatively restricted when compared with well-established coating techniques because of their inherent defects identified as cracks, pores and inclusions. Substantial evidence suggests that the incorporation of an appropriate amount of rare earth in laser claddings can remarkably prevent these defects. Additionally, the presence of rare earth in laser claddings can notably enhance tribo-mechanical properties such as surface hardness, modulus of elasticity, fracture toughness, friction coefficient and wear rate. In this literature review, the effect of rare earth in reducing dilution and cracks susceptibility of laser claddings in addition to microstructural refinement attained was examined. Mechanical and tribological properties of these claddings along with their underlying mechanism were discussed in detail. Finally, this article summarizes current applications of laser claddings based on rare earth and was concluded with future research directions.

关键词： laser cladding rare earth elements microstructure tribo-mechanical properties

A 99-year old patient with takotsubo cardiomyopathy recovering from cardiogenic shock

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Journal of Geriatric Cardiology 2019年第7期16卷 578-579页

作者： Mustafa Yenercag Ugur arslan Güney Erdogan Onur Osman Seker Osman Can Yontar Department of Cardiology University of Health Sciences Samsun Training and Research Hospital

Takotsubo syndrome(TTS)is a rare clinical entity commonly seen in post-menopausal women after an emotional or sometimes physical stress.[1,2]This syndrome is thought to be caused by increased circulation catecholamine levels secondary to an adrenergic stimulus resulting in transient coronary spasm and microvascular dysfunction.[3]TTS is characterized by acute and reversible left ventricular dysfunction with the typical ECG and clinical findings of an acute coronary syndrome but no significant coronary stenosis.[4]Typically,in TTS,antero-apical ballooning is observed in ventriculography,and segmentary wall motion abnormalities are observed in magnetic resonance imaging and *** heart failure,left ventricular outflow tract obstruction,mitral regurgitation and cardiogenic shock may complicate this syndrome.[5]Herein,we present a case who is the oldest one in the literature with TTS and cardiogenic shock.

关键词： Apical ballooning Levosimendan Takotsubo cardiomyopathy

Effects of Inoculum Density on Plant Growth and Hydrocarbon Degradation

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Pedosphere 2016年第5期26卷 774-778页

作者： Ghulam SHABIR Muhammad arslan Kaneez FATIMA Imran AMIN Qaiser Mahmood KHAN Muhammad AFZAL Environmental Biotechnology Division National Institute for Biotechnology and Genetic Engineering (NIBGE) Earth Sciences Department King Fahd University of Petroleum and Minerals

The combined use of plants and bacteria is a promising approach for the remediation of soil contaminated with organic pollutants. Different biotic and abiotie factors can affect the survival and activity of the applied bacteria and consequently plant growth and phy- toremediation efficiency. The effect of inoculum density on the abundance and expression of alkune-degrading genes in the rhizosphere of plant vegetated in hydrocarbon-contaminated soil has been rarely observed. In this study, an alkane-degrading bacterium （Pantoea sp. strain BTRH79）, at different inoculum densities （10^5 to 10^8 cells cm^-3 soil）, was inoculated to ryegrass （Lolium perenne） vegetated in diesel-contaminated soil to find the optimum inoculum density needed for its efficient colonization and hydrocarbon degradation activity. Bacterial inoculation improved plant growth and hydrocarbon degradation. Maximum plant growth and hydrocarbon degra- dation were observed with the inoculum having the highest cell density （10^8 cells cm^-3 soil）. Moreover, the inoculum with higher cell density exhibited more abundance and expression of alkane hydroxylase gene, CYP153. This study suggests that the inoculum density is one of the main factors that can affect bacterial colonization and activity during phytoremediation.

关键词： alkane-degrading bacterium gene abundance gene expression phytoremediation plant-bacteria partnership

Investigating Catalase and Carbonic Anhydrase Enzyme Activities and Levels of Certain Trace Elements and Heavy Metals in Patients with Primary and Metastatic Hepatic Carcinoma

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Journal of Cancer Therapy 2013年第8期4卷 1373-1381页

作者： Ayse arslan Halit Demir Harun arslan Department of Biochemistry Faculty of Science Yuzuncu Yil University Van Turkey Radiology Department Van Regional Training and Research Hospital Van Turkey

Hepatocellular carcinoma (HCC) is among most common terminal cancer types in the world. Primary etiological factors include cirrhosis, hepatitis, aflatoxin and alcohol. The current study was conducted to determine cytosolic erythrocyte carbonic anhydrase and catalase enzyme activities and levels of some trace elements. For this purpose, 40 patients with primary and metastatic hepatic cancer and 29 healthy volunteers enrolled to the study. Catalase and carbonic anhydrase enzyme activities and serum trace element levels were measured in patient and control groups. In the current study, serum copper, magnesium, manganese and zinc levels were lower in the primary and metastatic hepatic cancer group in comparison with the control group (P < 0.05). In contrast, serum iron, cobalt, cadmium and lead levels were higher in the patient relative to the control group (P < 0.05). In comparison with the control group, the catalase level was lower in primary and metastatic cancer group, while the carbonic anhydrase level was higher in the cancer group (P < 0.05). Changes in levels of trace elements and anti-oxidant enzymes may be the factors which influence the development and progression of liver cancer. The carbonic anhydrase enzyme can be a useful indicator in the diagnosis of cancer. However, this issue warrants further investigation.

关键词： Primary and Metastatic Liver Cancer Catalase Carbonic Anhydrase Trace Element Heavy Metal