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Effects of Porosity on Piezoelectric Characteristics of Polyvinylidene Fluoride Films for Biomedical Applications

Biomedical Engineering Frontiers 2023年第1期4卷 92-99页

作者： Jack T.kloster Matthew J.Danley Victor K.Lai Ping Zhao Advanced Materials Science University of Minnesota-DuluthDuluthMN 55812USA Department of Chemical Engineering University of Minnesota-DuluthDuluthMN 55812USA Department of Mechanical and Industrial Engineering University of Minnesota-DuluthDuluthMN 55812USA

Objective:The objective of this work is to study the effects of porosity on mechanical and piezoelectric properties of polyvinylidene fluoride(PVDF)films for biomedical *** Statement:By investigating the piezoelectric properties of PVDF and the porosity effect on its electromechanical performance,there is potential for further development of PVDF as a hemodynamic sensor that can lead to further technological advancements in the biomedical field,benefiting patients and physicians ***:PVDF thin films have shown potential in the application of hemodynamic flow sensing and monitoring the effects on blood flow caused by prosthetic valve implantation via the transcatheter aortic valve replacement *** piezoelectric performance of PVDF films can be influenced by the porosity of the ***:In this study,strain tracking was performed on thin film PVDF specimens with various levels of porosity and pore sizes to determine the mechanical properties of the *** mechanical properties were used to model the PVDF material in COMSOL multiphysics software,in which compression test simulations were performed to determine the piezoelectric coefficient d33 of the ***:A decline in the elastic modulus was found to be highly inversely correlated with porosity of the specimens and the simulation results show that elastic modulus had a much greater effect on the piezoelectric properties than Poisson’s ***:A combination of experimental and computational techniques was able to characterize and correlate the mechanical properties of PVDF films of varying porosities to their piezoelectric properties.

关键词： piezoelectric porosity modulus

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Validation of the Danish version of the musculoskeletal tumour society score questionnaire

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World Journal of Orthopedics 2019年第1期10卷 23-32页

作者： Casper kloster Pingel Saebye Johnny Keller Thomas Baad-Hansen Sarcoma Centre of Aarhus University Hospital Department of Orthopedic Surgery Aarhus University Hospital

BACKGROUND The musculoskeletal tumour society score(MSTS) is a well-known questionnaire for measuring functional outcome in patients with neoplasms in the *** guidelines for cross-cultural translation and validation ensure the equivalence of content between the original and translated versions. The translation and validation provide the possibility to compare different sarcoma populations on an international level. This study is based on the hypothesis that the Danish MSTS questionnaire is a valid tool for measuring the end result after surgery for neoplasms in the *** To validate the Danish version of the upper and lower extremity version of the *** The translation of the MSTS was conducted in accordance with international guidelines. Patients operated for sarcomas and aggressive benign tumors were invited to participate in the study. The psychometric properties of the Danish version of the MSTS were tested in terms of validity and reliability and for the risk of floor or ceiling effect. Spearman's rank coefficient was used to test the validity by comparing with the Toronto Extremity Salvage Score(TESS). The Intraclass Correlation Coefficient(ICC) was used to evaluate inter-rater reliability. Cronbach's alpha was used to test for internal consistency. Spearman's rank coefficient was used to compare the MSTS lower extremity version with the objective test, Timed Up and Go(TUG).RESULTS The upper extremity version demonstrated an ICC of 0.95 in the inter-rater reliability test. The lower extremity version had an ICC of 0.88 in the inter-rater reliability test, respectively. Both MSTS versions showed a ceiling effect. Thevalidity of the MSTS was measured by Spearman's rank correlation coefficient by comparing the MSTS with the TESS and found it to be of 0.80(P < 0.01) and 0.83(P < 0.01) for the upper extremity and lower extremity version, respectively. A Spearman's rank correlation coefficient of-0.26(P < 0.01) was found betwee

关键词： Sarcoma Patient outcome assessment Clinical oncology Surgical oncology Patient satisfaction

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逆风飞翔

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汽车工艺师 2015年第2期 20-21页

作者： kloster 福士汽车零部件(济南)有限公司

在福士汽车零部件（济南）有限公司,我们相信,在中国重型载货车（HDT）行业,总体的宏观经济趋势是需求将出现反弹,因为中央政府的刺激措施提高了基础建设方面的支出并由此带来了更多的物流活动。这种大趋势会伴随着由于国Ⅳ排放标准出... 详细信息

在福士汽车零部件（济南）有限公司,我们相信,在中国重型载货车（HDT）行业,总体的宏观经济趋势是需求将出现反弹,因为中央政府的刺激措施提高了基础建设方面的支出并由此带来了更多的物流活动。这种大趋势会伴随着由于国Ⅳ排放标准出台而带来的提前购车潮,但由于2014年初所表现出来的提前购买行为已经逐渐消失,因此这种影响将比较有限。

关键词：重型载货车提前购买固定资产投资排放标准 Jinan customer Automotive expect solely 市场策略

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关于何时对腰穿后头痛进行硬膜外血贴疗法的一项基于79例患者队列的理论研究

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世界核心医学期刊文摘（神经病学分册） 2005年第10期1卷 8-8页

作者： Vilming S.T. kloster R. Sandvik L. 高宗恩 Department of Neurology Ullevaal Hospital University of Oslo 0407 Oslo Norway

The aim of the present study was to decide on which day in the course of post lumbar puncture headache (PPH) an epidural blood patch (EBP) should be performed to minimize suffering. A cohort of 79 patients (64 female, 15 male) was followe d prospectively for 14 days and the consequences of performing an EBP on differe nt days were studied. If no EBP was performed, the patients would accumulate 141 days with PPH5 (bedridden most of the day), 216 days with PPH4- 5 (bedridden m ore than half the day), and 293 days with PPH3- 5 (bedridden half the day or mo re). If these patients were patched on day 2, 3 or 4 after an initial observatio n of the PPH grade on day 1, the expected suffering was substantially reduced, a nd the more the earlier in the course the EBP was performed. If the strategy was to treat only patients with PPH5 with an expected 90% success rate, the reduc tion compared with no treatment was 50% if treated on day 2, 37% if treated on day 3, and 29% if treated on day 4. The corresponding figures for treating patients with PPH4- 5 was a 51, 44 and 29% reduction, and for PPH3- 5 the re duction was 62, 49 and 35% , respectively. Irrespective of strategy, the expect ed reduction of suffering in the cohort was greatest when the EBP was performed early in the course of PPH. It is suggested that the decision to perform an EBP should be made at an early stage and offered to patients who have to lie in bed for more than half a day despite conservative treatment.

关键词：腰穿后头痛理论研究程中

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