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Manufacturing size effect on the structural and mechanical properties of additively manufactured Ti-6Al-4V microbeams

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Journal of Materials Science & Technology 2023年第18期149卷 18-30页

作者： Kaiyang Yin Bo Cao Juraj Todt Florian Gutmann Hasan Furkan Tunçay Antonina Roth Frank Fischer nadira grübel Aron Pfaff Georg C.Ganzenmüller Jozef Keckes Stefan Hiermaier Christoph Eberl Department of Microsystems Engineering University of FreiburgFreiburgGermany Cluster of Excellence livMatS@FIT-Freiburg Center for Interactive Materials and Bioinspired Technologies University of FreiburgFreiburgGermany Chair of Materials Physics Montanuniversität LeobenLeobenAustria INATECH University of FreiburgFreiburgGermany Fraunhofer Ernst-Mach Institut EMIFreiburgGermany Fraunhofer IWM FreiburgGermany

The size effect of Ti-6Al-4V submillimeter structures manufactured by selective laser melting,which is critical for metallic mechanical metamaterials of unique mechanical properties,for example,nega-tive Poisson’s ratio and ultrahigh modulus,which show promise in biomedical,environmental,energy-related applications,has not been systematically *** here are the quantification of the porosities by X-ray microtomography scans,texture analysis,and mechanical characterization of the addi-tively manufactured Ti-6Al-4V *** found linearly decreasing porosities,increasing mechan-ical properties,and increasing texture in the microbeam with increasing diameter from 250 to 500μ*** variation of microstructure in microbeams of different diameters and along the sample height,result-ing from the printing parameters and the thermal conditions,leads to the discrepancy between the be-havior observed in experiments and finite element *** results provide the structure-property-processing correlation to improve the manufacturing and prediction of the mechanical behavior of metal-lic mechanical metamaterials.

关键词： Selected laser melting Porosity Texture Epitaxial growth Finite element modeling Metallic mechanical metamaterials

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University-School Partnership in China:Teachers’Personal Factors,Working Conditions,and Principal Leadership That Explain Their Development in Teaching

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Frontiers of Education in China 2020年第4期15卷 621-646页

作者： Xin ZHANG Wilfried ADMIRAAL nadira SAAB graduate School of Teaching Leiden University2300 AX Leidenthe Netherlands

In China,the university-school partnership(USP)is a community of continuous professional development(PD)for teachers,involving teacher educators who visit *** study explores teachers’personal factors,school working conditions,and principal leadership in order to explain differences in teachers’learning when they have participated in the training *** a one-group pretest-posttest design,375 teachers from 12 primary schools in Shanghai *** learning performances are measured by changes in their teaching quality as evaluated by their *** of regression analyses show that teachers generally receive higher scores on teaching quality after the program than *** factors are significantly and negatively related to the changes in quality:teachers’educational level,the extent to which teachers feel emotional pressure in their profession,and the support from their school *** for school leaders and policymakers are discussed.

关键词： university-school partnership(USP) teaching quality principal leadership development in teaching professional development(PD) school working conditions

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Eye and foot checks in patients with diabetes on haemodialysis: Are they done,and who does them?

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World Journal of Diabetes 2017年第9期8卷 436-439页

作者： nadira Bibi Mothojakan Shazia Hussain Kieran McCafferty Mohammed Magdi Yaqoob Tahseen Ahmad Chowdhury Department of Diabetes and Metabolism Barts Health NHS Trust the Royal London Hospital Department of Nephrology Barts Health NHS Trust the Royal London Hospital

AIM To determine if retinal and foot checks are carried out on patients with diabetes receiving *** Eighty-four patients with diabetes receiving haemodialysis were asked if they recalled having eye and foot screening in the last year, and if so, by whom was the check *** Seventy-seven(91.7%) patients recalled having an eye check in the preceding 12 mo. Of these, 52(67.5%) did so in an ophthalmology clinic, 17(22%) in retinal screening, three(3.9%) in an optician clinic. Three patients(3.9%) went to both ophthalmology and retinal screening, and two (2.6%) attended an ophthalmology and optician. Seventy (83.3%) patients recalled having a foot check in the preceding 12 mo. Of these, 33 (47.1%) were done by practice nurse, 14 (20%) by a diabetes nurse, 11 (15.7%) by a general practitioner, eight (11.4%) by a chiropodist, and four (5.7%) were each checked by renal nurse, diabetes consultant, junior doctor, or unknown person at a foot *** Most patients with diabetes on haemodialysis are able to recall having an eye check in the last year, although 8.3% could not. A significant proportion of patients could not recall having a foot check (16.7%) in the last year. This baseline audit suggests that an improvement in the rate of foot screening is important to achieve in patients with diabetes on haemodialysis in our unit.

关键词： Diabetes Haemodialysis Foot screening Retinal screening

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Application of QUEST Model of Questioning in the Classroom： Action Research Methodology in High School Education

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Journal of Health Science 2015年第1期3卷 24-27页

作者： nadira Pardo Patrick Bakes Behavioral Sciences Faculty at the California Southern University 930 Roosevelt Irvine CA 92620 USA Principal of the Circular Head Christian School 48 Nelson St. Smithton TAS 7330 Australia

It is well known that humans learn through a process of assimilation, incorporating new concepts into existing cognitive structures and forming revised representations in their mental lexicon. The study examines the application of the theories underlying graesser＇s QUEST model to the high school classroom, to determine if the framing of new concepts into question-asking protocols and cognitive rehearsal regimes allows for increased and enhanced learning in high school students. Mandler＇s seminal work in Cognitive Psychology, Learning, and Memory are well known （1967） as is the work of one of his former graduate students, now Professor Emeritus, Dr. Arthur C graesser from the University of Memphis （USA） who developed the QUEST model with his own graduate students, including Dr. Pardo, in the AI and Cognitive Science Laboratories at the University of Memphis. A pre-test/post-test quasi-experimental design was applied to two different levels of math and science classes, and overall performance was measured by how many questions they could answer before and after the classroom instruction.

关键词： LTM cognitive processing teaching methods.

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In vitro antioxidant and anti-inflammatory activities of Korean blueberry(Vaccinium corymbosum L.) extracts

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Asian Pacific Journal of Tropical Biomedicine 2014年第10期4卷 807-815页

作者： nadira Binte Samad Trishna Debnath Michael Ye Md.Abul Hasnat Beong Ou Lim Department of Applied Biochemistry Konkuk UniversityChungju 380-701Korea

Objective:To investigate in vitro antioxidant and anti-inflammatory activities of Korean blueberry(Vaccinium corymbosum L.).Methods:Total phenolic and flavonoid contents of the Korean blueberry water and ethanol extracts were determined before determining the potential of the extracts as *** activity of the extracts was determined by following some well established methods for free radical scavenging such as 2,2-diphenyl-picrylhydrazyl hydrate,1,2,2-azinobis-(3-ethylbenzothiazoline-6-sulfonicacid),free radical induced DNA damage,superoxide dismutaselike and catalase assay ***,1-(4,5-dimethylthiazol-2-yl)-3,5-diphenylformazan and nitric oxide assay were performed to determine the anti-inflammatory activity of the ***:Total phenolic contents were found(115.0±3.0) and(4.2±3.0) mg GAE/100 g fresh mass for both extracts,respectively and flavonoid contents were(1 942.8±7.0) and(1 292.1±6.0) mg CE/100 g fresh mass for water and ethonal extracts,*** the extracts displayed significant scavenging activity of some radicals such as 2,2-diphenyl-picrylhydrazyl hydrate(IC_(50) at 1.8 mg/mL and 2.05 mg/mL,respectively),l,2,2-azinobis-(3-ethylbenzothiazoline-6-sulfonicacid)(IC_(50) at1.5 mg/mL and 1.6 mg/mL,respectively) and nitrite(IC_(50) at 1.7 mg/mL and 1.5 mg/mL,respectively)*** extracts were found to prevent inflammation as well by reducing nitric oxide production and cytotoxicity in ***:The findings suggest that the fresh Korean blueberry could be used as a source of natural antioxidants and anti-inflammatory agents.

关键词： Phenolics Flavonoids DPPH radical scavenging Nitrite scavenging DNA damage Antiinflammatory activity

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Transient Stability Simulation of 33 kV Power grid

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Energy and Power Engineering 2018年第6期10卷 301-318页

作者： Nader Barsoum nadira Zulkeffley Myjessie Songkin Department of Electrical and Electronics Engineering Faculty of Engineering Universiti Malaysia Sabah (UMS) Kota Kinabalu Sabah Malaysia

An example of Sandakan power grid problem is presented in this paper. Sandakan is a suburb in east coast of Sabah state of Malaysia. Stability problem occurs due to the increase in load demand, lack of generation sources and inadequate supply. The tripping disturbances occur frequently in the network which is contributing to voltage instability. In this paper dynamics stability of 33 kV power grid as related to Sandakan network is analyzed and simulated. The analysis is completed by modelling the network data in Power System Simulation for Engineering (PSS/E) software and simulate the transient stability of generator, exciter and governor during a three phase fault occurs on a far and close distance from a bus, and determine the critical clearing time as well as swing curve of rotor angle. The output values of electrical power, machine speed, rotor angle and bus voltage are observed.

关键词： Transient Stability PSS/E Load Flow Generator Exciter Governor Critical Clearing Time

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Recent insights into the characteristics and role of peritoneal macrophages from ascites of cirrhotic patients

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World Journal of Gastroenterology 2021年第41期27卷 7014-7024页

作者： Pilar García-Peñarrubia Antonio JoséRuiz-Alcaraz Miriam Ruiz-Ballester Tamara nadira Ramírez-Pávez María Martínez-Esparza Department of Biochemistry and Molecular Biology B and Immunology School of MedicineUniversity of MurciaMurcia 30100Spain

Macrophages are a diverse myeloid cell population involved in innate and adaptive immune responses,embryonic development,wound repair,and regulation of tissue *** cells link the innate and adaptive immunities and are crucial in the development and sustainment of various inflammatory *** are tissue-resident cells in steady-state conditions;however,they are also recruited from blood monocytes after local pathogen invasion or tissue *** macrophages vary based on their cell complexity,phenotype,and functional *** cells regulate inflammation and control bacterial infections in the ascites of decompensated cirrhotic *** recent work reported several phenotypic and functional characteristics of these cells under both healthy and pathological conditions.A direct association between cell size,CD14/CD16 expression,intracellular level of GATA-6,and expression of CD206 and HLA-DR activation/maturation markers,indicate that the large peritoneal macrophage CD14^(high)CD16^(high)subset constitutes the mature phenotype of human resident peritoneal macrophages during ***,elevated expression of CD14/CD16 is related to the phagocytic *** novel large CD14^(high)CD16^(high)peritoneal subpopulation is increased in the ascites of cirrhotic patients and is highly sensitive to lipopolysaccharide(LPS)-induced activation,thereby exhibiting features of inflammatory ***,phosphorylation of ERK1/2,PKB/Akt,and c-Jun is remarkably increased in response to LPS in vitro,whereas that of p38 MAPK is reduced compared with the monocyte-derived macrophages from the blood of healthy ***,in vitro activated monocyte-derived macrophages from ascites of cirrhotic patients secreted significantly higher levels of IL-6,IL-10,and TNF-αand lower amounts of IL-1βand IL-12 than the corresponding cells from healthy donor’s *** on these results,other authors have recently reported that the sur

关键词： Cirrhosis Inflammation Peritoneal macrophages Phenotypic markers Activation routes

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The group Method of Data Handling （GMDH） and Artificial Neural Networks （ANN）in Time-Series Forecasting of Rice Yield

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材料科学与工程（中英文B版） 2011年第3期1卷 378-387页

作者： nadira Mohamed Isa Shabri Ani Samsudin Ruhaidah Department of Mathematics Faculty of Science Universiti Teknologi Malaysia Skudai 81310 Johor Malaysia Department of Software Engineering Faculty of Computer Science and Information System Universiti Teknologi Malaysia Skudai 81310 Johor Malaysia

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Ayudando a Una LobaSolitaria y Su Cub Moribundo： Helping a Lone Wolf and Her Dying Cub

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Journal of Health Science 2016年第6期4卷 336-344页

作者： Dawn Loshigian nadira T. Pardo California Southern University Irvine CA USA

The purpose of this article is to describe the experience of a young, single, Latina parent whose child has died as a result of a rare, terminal genetic defect in the context of a long standing friendship. The article exantines the communication of an effective bereavement counselor as well as seeks to explore the systematic steps parents could employ to help their children with life limiting illnesses including treatment, palliative care, removing life support, hospice, and managing personal grief. Finally, special considerations were made to be sensitive to pertinent multicultural and spiritual or religious aspects that may be evident in the unique world of parents who have lost a child.

关键词： Death of a child parents Hispanics grief mourning bereavement.

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Latent tuberculosis infection among medical students in Malaysia

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Asian Pacific Journal of Tropical Medicine 2019年第4期12卷 181-184页

作者： Maha Abdullah Ummi nadira Daut Siti Aishah Daud Nor Afifi Mohd Romli Marsitah Abdul Jalil Noorelina Muhammad Safarina Mohammad Ismuddin Masriana Hassan Department of Pathology Faculty of Medicine and Health Sciences Universiti Putra Malaysia

Objective: This study aimed to determine prevalence of latent tuberculosis infection among medical students and tuberculosis exposure at the health facilities. Methods: A cross-section of study year 1(n=68) and year 5(n=75) medical students in a local university were recruited for latent tuberculosis infection testing using QuantiFERON-TB Gold Plus and a questionnaire analyzed for multivariate risk. Results: The majority of the study were vaccinated with BCG. None of year 1 medical students were positive for latent tuberculosis infection, however, six(8.0%) year 5 students were tested positive for latent tuberculosis infection. A higher incidence of year 5 medical students claimed to be exposed to tuberculosis at health facility(65.3% vs. 4.4%) and a higher percentage reported contact with tuberculosis case over the preceding year compared to year 1 students(30.7% vs. 8.8%). Conclusion: We observed a higher incidence of latent tuberculosis infection and higher exposure to tuberculosis in health facilities among year 5 medical students. Baseline screening and monitoring for progression to tuberculosis infection may benefit tuberculosis management programs.

关键词： Latent tuberculosis infection Medical students Interferon-gamma release assay

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