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In-depth analysis of the influence of bio-silica filler(Didymosphenia geminata frustules)on the properties of Mg matrix composites

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Journal of Magnesium and Alloys 2023年第8期11卷 2853-2871页

作者： Izabela B.zgłobicka Anna Dobkowska Aleksandra Zielińska Ewa Borucinska Mirosław J.Kruszewski RafałZybała Tomasz Płociński Joanna Idaszek Jakub Jaroszewicz Krystian Paradowski Bogusława Adamczyk-Cieślak Kostiantyn Nikiforow Bartosz Bucholc WojciechŚwięszkowski Krzysztof J.Kurzydłowski Faculty of Mechanical Engineering Bialystok University of TechnologyWiejska 45C15-351 BialystokPoland Faculty of Materials Science and Engineering Warsaw University of TechnologyWoloska 14102-507 WarsawPoland Lukasiewicz Research Network–Institute of Microelectronics and Photonics Al.Lotnikow 32/4602-668 WarsawPoland Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/5201-224 WarsawPoland Institute of Fundamental Technological Research Polish Academy of Sciences Pawinskiego 5B02-106WarsawPoland

A novel metal matrix composites(MMC)with Mg matrix reinforced with natural filler in the form of Didymosphenia geminata frustules(algae with distinctive siliceous shells)are presented in this *** plasma sintering(PPS)was used to manufacture Mg-based composites with 1,5 and 10 vol.%ceramic *** a reference,pure Mg was *** results show that the addition of 1 vol.%Didymosphenia geminata frustules to the Mg matrix increases its corrosion resistance by supporting passivation reactions,and do not affect the morphology of L929 *** of 5 vol.%the filler does not cause cytotoxic effects,but it supports microgalvanic reactions leading to the greater corrosion *** content than 5 vol.%the filler causes significant microgalvanic corrosion,as well as increases cytotoxicity due to the greater micro-galvanic effect of the composites containing 10 and 15 vol.%*** results of contact angle measurements show the hydrophilic character of the investigated materials,with slightly increase in numerical values with addition of amount of ceramic *** addition of Didymosphenia geminata frustules causes changes in a thermo-elastic properties such as mean apparent value of coefficient of thermal expansion(CTE)and thermal conductivity(λ).The addition of siliceous reinforcement resulted in a linear decrease of CTE and reduction in thermal conductivity over the entire temperature *** the increasing addition of Didymosphenia geminata frustules,an increase in strength with a decrease in compressive strain is *** all composites an increase in microhardness was *** results clearly indicate that filler in the form of Didymosphenia geminata frustules may significantly change the most important properties of pure Mg,indicating its wide potential in the application of Mg-based composites with a special focus on biomedical use.

关键词： Metal-matrix composites(MMCs) Pulse plasma sintering(PPS) Ceramic filler Microstructure Properties

Periodic surface structures fabricated by one excimer laser pulse through a silica phase mask grating

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Chinese Science Bulletin 1997年第21期42卷 1787-1792页

作者： Luo, GP Wu, HM Wang, M Zhu, SN Lu, YQ Liu, zg Wei, Y Ming, NB Nanjing Univ Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China

RECENTLY, excimer laser devices, which have higher-energy density output in pulsed ultravio-let (UV) light (193 or 248 nm), have been employed to generate some thin film struc-tures. The principle of this technique, which is also called pulsed laser deposition (PLD)technique, is that the exposed material could be ablated out of the sample by the focusing laserbeam, and redeposit on a substrate to form thin-film structures under certain conditions. Onthe other hand, researchers have obtained high-quality Bragg gratings in photosensitive

关键词： excimer laser pulse phase mask grating periodic surface structures.

Clinical and laboratory features of COVID-19 patients infected with SARS-CoV-2 variant B.1.1.7 versus those infected with other SARS-CoV-2 strains:A retrospective observational study

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Journal of Acute Disease 2022年第6期11卷 236-242页

作者： Zeynep Ergenc Hasan Ergenc AhmetÖztürk Gülsüm Kaya Özlem Karaca Ocak Özgürİnce Department of Internal Medicine Ayancık Government HospitalSinopTurkey Department of Emergency Medicine Çorum Erol Olçok Training and Research HospitalÇorumTurkey Department of Infection Control Committee Sakarya Univercity Training and Research HospitalSakaryaTurkey Department of General Surgeon Medicana International HospitalSamsunTurkey Department of Pulmonology Medicana International HospitalSamsunTurkey

Objective:To investigate the clinical symptoms of coronavirus disease 2019(COVID-19)patients with and without B.1.1.7 ***:This retrospective observational study included COVID-19 patients who were divided into two groups,the mutation and the non-mutation *** characteristics,clinical characteristics,laboratory parameters,and mortality rates were recorded and compared between the two ***:A total of 196 patients were included in the *** relationship between the mutant virus status and sex,age,comorbidity,survival status,and disease severity was not significant(P>0.05).No significant differences were found in duration of hospitalization between the mutation and the non-mutation group(P>0.05).However,there was a statistically significant difference between patients with and without mutant viruses in hemoglobin,mean platelet volume,procalcitonin,low density lipoprotein,iron-binding capacity,potassium,calcium,C-reactive protein,folate,creatine kinase myocardial band,D-dimer,and international normalized ratio(Phout variant *** monitoring of COVID-19 patients is required for all variants.

关键词： COVID-19 B.1.1.7 Variant Mutation Clinical parameters Laboratory parameters

Triple rule-out computed tomography angiography:Evaluation of acute chest pain in COVID-19 patients in the emergency department

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World Journal of Radiology 2022年第8期14卷 311-318页

作者： Suzan Bahadir Sonay Aydın Mecit Kantarci Edhem Unver Erdal Karavas Düzgün CanŞenbil Department of Radiology Baskent UniversityAntalya 07000Turkey Department of Radiology Erzincan Binali Yıldırım UniversityErzincan 24100Turkey Department of Radiology Ataturk UniversityErzurum 25100Turkey Department of Chest Disease Erzincan Binali Yildirim UniversityErzincan 24100Turkey

BACKGROUND The aim of this study was to define clinical evidence supporting that triple ruleout computed tomography angiography(TRO CTA)is a comprehensive and feasible diagnostic tool in patients with novel coronavirus disease 2019(COVID-19)who were admitted to the emergency department(ED)for acute chest *** diagnostic imaging strategies in COVID-19 related thromboembolic events,will help for rapid and noninvasive diagnoses and results will be effective for patients and healthcare systems in all *** To define clinical evidence supporting that TRO CTA is a comprehensive and feasible diagnostic tool in COVID-19 patients who were admitted to the ED for acute chest pain,and to assess outcomes of optimizing diagnostic imaging strategies,particularly TRO CTA use,in COVID-19 related thromboembolic *** TRO CTA images were evaluated for the presence of coronary artery disease,pulmonary thromboembolism(PTE),or acute aortic *** analyses were used for evaluation of significant association between the variables.A two tailed P-valuehout pathology apart from imaging findings of the pneumonia group(62.5%vs 38.7%,P<0.001).Smoking history rates were similar in the ***,D-dimer,fibrinogen,C-reactive protein,and erythrocyte sedimentation rate values were higher in COVID-19 cases with additional *** TRO CTA is an effective imaging method in evaluat

关键词： COVID-19 Pulmonary thromboembolism Coronary artery disease Acute aortic syndromes Triple rule-out computed tomography angiography

Determining the edge effect of pine processionary moth (Thaumetopoea pityocampa) in its horizontal distribution in the stand

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Journal of Forestry Research 2019年第1期30卷 347-352页

作者： Salih Parlak kbal Meltem ?z?ankaya Mustafa Batur Mehmet Emin Akka? Zülfü Boza ?zgür Toprak Faculty of Forestry Bursa Technical University Aegean Forestry Research Inst?tute Forest Regional Management

Pine processionary moth is one of the most important forest pests in the Mediterranean Basin. There is need to explore its distribution behaviour to undertake effective control and determine the edge effect of its horizontal distribution in the stand. Five trial sites damaged by the insect were selected and traps installed in all trees in the sites. The number of nests and larvae was counted and diameter increment cores were taken. The distance to the edge of the stand revealed that there was no statistical difference in the number of nests and larvae up to 25 m while there was a statistically significant difference(0.5%)at [25 m. There was a 2-fold difference in the density of nests between 0 and 25 m and [25 meters, and a 3.8-fold difference in the number of larvae. The effect of pine processionary moth on tree diameter was not significant between trees at the edge of the stand and those in the stand.

关键词： Thaumetopoea pityocampa Pine processionary moth Edge effect

Diagnosis of asymptomatic atrial septal aneurysms using two-dimensional color Doppler and contrast transthoracic echocardiography

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Chinese Medical Journal 2003年第5期116卷 699-702页

作者： enol Coskun Cevad ekuri zgür Bayturan Hasan Yüksel Osman Saribülbül Ali Bilge Department of Pediatric Cardiology Faculty of Medicine Celal Bayer University Manisa Turkey Department of Cardiology Faculty of Medicine Celal Bayer University Manisa TurkeyDepartment of Pediatric Cardiology Faculty of Medicine Celal Bayer University Manisa Turkey Department of Cardiovascular Surgery Faculty of Medicine Celal Bayer University Manisa Turkey Department of Cardiology Faculty of Medicine Celal Bayer University Manisa Turkey

Objective To evaluate the dimensions of atrial septal aneurysm (ASA), the presence and characteristics of interatrial shunt, the movement of the wall of the aneurysm, and correlation between these findings and sign and/or symptoms suggesting embolism in Manisa, a district of a western Anatolian city of Turkey. Methods Two thousand five hundred cases were examined by routine transthoracic echocardiography (TTE) in both pediatric and adult cardiology outpatient clinics. ASA was detected in 20 cases and evaluated by two-dimensional color Doppler echocardiography (CDE). The length of the base, the maximum radius and the maximum displacement of ASA were measured. The shunt between the atria was examined by CDE. In cases where a shunt could not be found, galactose and palmitic acid was injected. Standard 12-lead electrocardiogram (ECG) and exercise stress test were also performed. Results No clinical signs or symptoms were found, suggesting a systemic or cerebral embolism. The maximum displacement of ASA was between 2 and 5 mm. All of the aneurysms were localized in the right atrium, and the walls of the aneurysm did not move beyond the base of the left atrium during the maximum displacement. Interatrial shunt was detected in 14 of 20 patients (70%) by CDE and in the remaining six cases by contrast TTE. Frequent ventricular ectopic beats were observed in one patient. Conclusions During routine TTE we observed 0.8% asymptomatic ASA in our population. The use of a contrast agent was found to be a valuable additional method in patients with ASA when the shunt could not be detected by CDE. The risk for embolism is not high when the maximum displacement of the wall of ASA was 5 mm or less and no bulge into the left atrium was observed. Based on our experience with this method, TTE is easy to perform, well-tolerated and acceptable.

关键词： aneurysm echocardiography embolism

Geological thermal events in Tarim Basin

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Chinese Science Bulletin 1997年第7期42卷 580-584页

作者： Chen, HL Yang, SF Dong, CW Zhu, GQ Jia, CA Wei, GQ Wang, zg Department of Earth Sciences Zhejiang University Hangzhou China Geological Research and Exploration Center Kuerle China Shanghai University Shanghai China

TARIM Basin is the biggest sedimentary basin in China, and it is also an important area of

关键词： Tarim Basin 40Ar/39Ar plateau age thermal events.

Effect of vaccination status on CORADS and computed tomography severity score in hospitalized COVID-19 patients:A retrospective study

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World Journal of Methodology 2023年第5期13卷 456-465页

作者： Umut Devrim Binay Erdal Karavaş Faruk Karakeçili Orçun Barkay Sonay Aydin Düzgün CanŞenbil Department of Infectious Diseases and Clinical Microbiology Erzincan Binali Yildirim UniversityFaculty of MedicineErzincan 24000Turkey Department of Radiology Bandırma 17 Eylül UniversityFaculty of MedicineBalıkesir 10200Turkey Department of Radiology Erzincan Binali Yıldırım UniversityFaculty of MedicineErzincan 24000Turkey

BACKGROUND The coronavirus disease 2019(COVID-19)pandemic is *** disease most commonly affects the *** the beginning of the pandemic thorax computed tomography(CT)has been an indispensable imaging method for diagnosis and *** disease is tried to be controlled with *** reduces the possibility of a severe course of the *** The aim of this study is to investigate whether the vaccination status of patients hospitalized due to COVID-19 has an effect on the CT severity score(CT-SS)and CORADS score obtained during *** The files of patients hospitalized between April 1,2021 and April 1,2022 due to COVID-19 were retrospectively reviewed.A total of 224 patients who were older than 18 years of age,whose vaccination status was accessible,whose severe acute respiratory syndrome coronavirus 2 polymerase chain reaction result was positive,and who had a Thorax CT scan during hospitalization were included in the *** Among the patients included in the study,52.2%were female and the mean age was 61.85 *** patients applied to the hospital on the average 7th day of their *** 63 patients were unvaccinated(Group 1),20 were vaccinated with a single dose of CoronaVac(Group 2),24 with a single dose of BioNTech(Group 3),38 with 2 doses of CoronaVac(Group 4),40 with 2 doses of BioNTech(Group 5),and 39 with 3 doses of vaccine(2 doses of CoronaVac followed by a single dose of BioNTech,Group 6).CT-SS ranged from 5 to 23,with a mean of *** CT-SS mean of the groups were determined as 14.17,13.35,11.58,10.87,11.28,10.85,***,as a result of the comparisons between the groups,the CT-SS levels of the unvaccinated patients found to be significantly higher than the other *** the vaccination rates increased,the rate of typical COVID-19 findings on CT was found to be significantly *** Increased vaccination rates in COVID-19 patients reduce the probability o

关键词： COVID-19 CORADS Computed tomography severity score Thorax computed tomography SARS-CoV-2 Vaccination

Synthesis of few layer single crystal graphene grains on platinum by chemical vapour deposition

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Progress in Natural Science:Materials International 2015年第4期25卷 291-299页

作者： S.Karamat S.Sonu?en ü.?elik Y.Uysall? E.?zg?nül A.Oral Department of Physics Middle East Technical University COMSATS Institute of Information Technology Faculty of Engineering and Natural Sciences Sabanc? University Nano Magnetics Instruments Ltd.

The present competition of graphene electronics demands an ef fi cient route which produces high quality and large area graphene. Chemical vapour deposition technique, where hydrocarbons dissociate in to active carbon species and form graphene layer on the desired metal catalyst via nucleation is considered as the most suitable method. In this study, single layer graphene with the presence of few layer single crystal graphene grains were grown on Pt foil via chemical vapour deposition. The higher growth temperature changes the surface morphology of the Pt foil so a delicate process of hydrogen bubbling was used to peel off graphene from Pt foil samples with the mechanical support of photoresist and further transferred to Si O2/Si substrates for analysis. Optical microscopy of the graphene transferred samples showed the regions of single layer along with different oriented graphene domains. Two type of interlayer stacking sequences, Bernal and twisted, were observed in the graphene *** presence of different stacking sequences in the graphene layers in fl uence the electronic and optical properties; in Bernal stacking the band gap can be tunable and in twisted stacking the overall sheet resistance can be reduced. Grain boundaries of Pt provides low energy sites to the carbon species, therefore the nucleation of grains are more at the boundaries. The stacking order and the number of layers in grains were seen more clearly with scanning electron microscopy. Raman spectroscopy showed high quality graphene samples due to very small D peak. 2D Raman peak for single layer graphene showed full width half maximum(FWHM) value of 30 cm-1. At points A, B and C, Bernal stacked grain showed FWHM values of 51.22, 58.45 and 64.72 cm-1, while twisted stacked grain showed the FWHM values of 27.26, 28.83 and 20.99 cm-1,respectively. FWHM values of 2D peak of Bernal stacked grain showed an increase of 20–30 cm-1 as compare to single layer graphene which showed its dispersive natu

关键词： Chemical vapour deposition Graphene hexagonal crystals Bernal stacking Twisted stacking Grain boundaries and hydrogen bubbling