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Assessment of glass fiber-reinforced polyester pipe powder in soil improvement

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Frontiers of Structural and Civil Engineering 2021年第3期15卷 742-753页

作者： Baki BAGRIACik Ahmet BEYCIOGLU Szymon TOPOLINSKI Emre AKMAZ Sedat SERT Esra Deniz GUNER Department of Civil Engineering Çukurova UniversityAdana 01330Turkey Department of Civil Engineering Adana Alparslan TürkeşScience and Technology UniversityAdana 01250Turkey Department of Civil Engineering UTP Science and Technology UniversityBydgoszcz 85796Poland Geoenvironmental Infrastructure(SGI)Research Group George Mason UniversityFairfaxVA 22030USA Department of Civil Engineering Sakarya UniversitySakarya 54187Turkey Department of Environmental Engineering Çukurova UniversityAdana 01330Turkey

This study investigates the use of glass fiber-reinforced polyester(GRP)pipe powder(PP)for improving the bearing capacity of sandy *** a series of direct share tests,the optimum PP addition for improving the bearing capacity of soils was found to be 12%.Then,using the optimum PP addition,the bearing capacity of the soil was estimated through a series of loading tests on a shallow foundation model placed in a test *** bearing capacity of sandy soil was improved by up to 30.7%.The ratio of the depth of the PP-reinforced soil to the diameter of the foundation model(H/D)of 1.25 could sufficiently strengthen sandy soil when the optimum PP ratio was *** analyses showed that the increase in the bearing capacity can be attributed to the chopped fibers in the PP and their multiaxial distribution in the *** improving the engineering properties of soils,using PP as an additive in soils would reduce the accumulation of the industrial waste,thus providing a twofold benefit.

关键词： shallow foundation sandy soil bearing capacity soil improvement pipe powder

Self-reported physical functioning,cardiometabolic health conditions, and healthcare utilization patterns in Million Veteran Program enrollees with Traumatic Brain Injury Screening and Evaluation Program data

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Military Medical Research 2023年第5期10卷 587-598页

作者： Alexandra L.Clark Makenna B.McGill Erin D.Ozturk David M.Schnyer Catherine Chanfreau‑Cofnier Victoria C.Merritt Research Service VA San Diego Healthcare System(VASDHS)San DiegoCA92161USA Department of Psychology The University of Texas at AustinAustinTX 78712USA San Diego State University/University of CaliforniaSan Diego Joint Doctoral Program San DiegoCA 92120USA va Informaticsand Computing Infrastructure(VINCI) VA Salt Lake City Health Care SystemSalt Lake CityUT 84148USA Department of Psychiatry School of MedicineUniversity of California San DiegoLa JollaCA 29093USA Center of Excel‑lence for Stress and Mental Health VASDHSSan Diego 92161USA

Background Examining the health outcomes of veterans who have completed the United States Veterans Health Administration’s(VHA’s)Traumatic Brain Injury(TBI)Screening and Evaluation Program may aid in the refinement and improvement of clinical care initiatives within the *** study compared self-reported physical functioning,cardiometabolic health conditions,and health care utilization patterns in Million Veteran Program enrollees with TBI Screening and Evaluation Program data(collected between 2007 and 2019),with the goal of enhancing understanding of potentially modifiable health conditions in this *** In this observational cohort study,veterans(n=16,452)were grouped based on the diagnostic outcome of the TBI Screening and Evaluation Program:1)negative TBI screen(Screen^(-));2)positive TBI screen but no confirmed TBI diagnosis[Screen^(+)/Comprehensive TBI Evaluation(CTBIE)^(-)];or 3)positive TBI screen and confirmed TBI diagnosis(Screen^(+)/CTBIE^(+)).Chi-square tests and analysis of covariance were used to explore group differences in physical functioning,cardiometabolic health conditions,and health care utilization patterns,and logistic regressions were used to examine predictors of Screen^(+/-)and CTBIE^(+/-)group *** The results showed that veterans in the Screen^(+)/CTBIE^(-)and Screen^(+)/CTBIE^(+)groups generally reported poorer levels of physical functioning(P’s0.5)compared with the Screen-group;however,health outcomes were generally comparable between the Screen^(+)/CTBIE^(-)and Screen^(+)/CTBIE^(+)***-up analyses confirmed that while physical functioning,hypertension,stroke,healthcare utilization,and prescription medication use reliably distinguished between the Screen-and Screen^(+)groups(P’s<0.02,OR’s 0.78 to 3.38),only physical functioning distinguished bet

关键词： Traumatic brain injury(TBI)screen Comprehensive TBI Evaluation(CTBIE) Health outcomes Cardiometabolichealth Veterans Million Veteran Program(MVP)

稳定同位素稀释/液相色谱-串联质谱法同时测定婴幼儿配方奶粉中5种脂溶性维生素

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食品安全质量检测学报 2018年第23期9卷 6130-6139页

作者：严华崔凤云别玮冯鑫梁娜娜张朝晖北京出入境检验检疫局检验检疫技术中心北京100026

目的建立稳定同位素稀释/液相色谱-串联质谱法同时测定婴幼儿配方奶粉中5种脂溶性维生素(va、VD2、VD3、VE和VK1)的分析方法。方法样品经皂化,正己烷提取,甲醇定容,经ACQUITY UPLC BEH C18色谱柱(100 mm×2.1 mm, 1.7μm)分离,以0.2%甲... 详细信息

目的建立稳定同位素稀释/液相色谱-串联质谱法同时测定婴幼儿配方奶粉中5种脂溶性维生素(va、VD2、VD3、VE和VK1)的分析方法。方法样品经皂化,正己烷提取,甲醇定容,经ACQUITY UPLC BEH C18色谱柱(100 mm×2.1 mm, 1.7μm)分离,以0.2%甲酸水溶液和甲醇-乙腈(4:6, V:V)为流动相,梯度洗脱,采用正离子源电喷雾电离,多反应监测模式测定,同位素内标法定量。结果 va、VD2、VD3、VE和VK1在一定浓度范围内具有良好的线性关系,相关系数(r2)大于0.99,检出限为0.2～5μg/100 g,定量限为0.6～15μg/100 g。5种维生素的加标回收率为89.3%～109.2%,相对标准偏差(relative standard deviation,RSD)为3.82%～8.72%(n=6)。结论本研究建立的方法在很大程度上简化了婴幼儿配方奶粉中脂溶性维生素的检测流程,提高了实验效率和检测结果的准确性。

关键词：婴幼儿配方奶粉脂溶性维生素液相色谱-串联质谱法同位素内标法