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53篇 您的检索式:作者名="Allison John"
    题名 作者 年代 出处 被引量
1Suppression of m6A reader Ythdf2 promotes hematopoietic stem cell expansion显示文摘Zhenrui Li Pengxu Qian Wanqing Shao Hailing Shi Xi C. He Madelaine Gogol Zulin Yu Yongfu Wang Meijie Qi Yunfei Zhu John M. Perry Kai Zhang Fang Tao Kun Zhou Deqing Hu Yingli Han Chongbei Zhao Richard Alexander Hanzhang Xu Shiyuan Chen Allison Peak Kathyrn Hall Michael Peterson Anoja Perera Jeffrey S. Haug Tari Parmely Hua Li Bin Shen Julia Zeitlinger Chuan He Linheng Li 2018Cell Research2018,28,9:18
2铸造压力对ADC12Z压铸件孔洞和力学性能的影响显示文摘测定了不同铸造压力下ADC12Z压铸件密度、孔洞面积百分比、孔洞平均直径及力学性能,研究了铸造压力对ADC12Z压铸件孔洞和力学性能影响。结果表明,随着铸造压力增大,压铸件孔洞面积百分比和平均粒径逐渐减小,密度逐渐增大;同时,铸造压力增大可以细化α-Al和黑色针片状共晶Si,使压铸件力学性能明显改善。但当铸造压力增加到一定程度,压力的增加对密度、孔洞及性能影响幅度变小。闫焉服 熊守美 柳百成 Mei Li John Allison 2007铸造2007,56,11:17
3应用两相流模型模拟压铸充型过程的卷气现象显示文摘通过对压铸充型过程中卷气缺陷形成机理的分析,认为型腔中空气的流动以及与金属液之间的相互作用是形成卷气现象的主要原因.为了考虑型腔中空气的流动,采用了一种不可压缩两相流数学模型来模拟压铸充型过程的卷气现象.通过计算流体力学中的两个基准算例,较为全面地验证了该模型的准确性和可靠性.在此基础上,设计了专门针对压铸充型过程的高速水模拟实验,通过对可视化实验结果与两相流模拟结果的比较,证实二者吻合较好,说明了该模型能够较好地模拟液体的充填行为和卷入其中的气泡.李帅君 熊守美 Mei Li John Allison 2009金属学报2009,45,10:16
4压铸充型过程中卷气现象的数值模拟研究显示文摘采用一种液-气两相耦合模型模拟了压铸充型过程中的卷气现象,对卷入金属液中的每个气泡均单独计算其压力变化的趋势,通过压力传递将液-气两相联系在一起.为了验证模型的可靠性和准确性,开展了专门针对压铸的高速水模拟实验,并采用液-气两相耦合模型以及单相流模型分别进行了模拟,通过比较可以证实两相耦合模型在模拟卷气方面比单相流模型具有更高的精确度.李帅君 熊守美 Mei Li John Allison 2010金属学报2010,46,5:16
5压铸过程中铸件-铸型界面换热系数与铸件凝固速率的关系显示文摘在实际压铸实验的基础上,求解了铸件-铸型界面换热系数h与铸件凝固速率v的关系.结果表明,二者呈线性变化关系:h=k_(h-v)·v+ω(其中,斜率k_(h-v)为铸型初始表面温度及铸件厚度的函数,ω为常数);通过线性拟合确定k_(h-v)和ω值,从而确立换热系数与铸件凝固速率的关系.这种关系同时适用于镁合金AM50和铝合金ADC12.郭志鹏 熊守美 Mei Li John Allison 2009金属学报2009,45,1:6
6Understanding of the influence of process parameters on the heat transfer behavior at the metal/die interface in high pressure die casting process显示文摘The current paper focuses on the influence of the process parameters on the peak values of the inter-facial heat transfer coefficient (IHTC) at metal/die interface during high pressure die casting (HPDC) process. A 'step shape' casting and AM50 alloy were used during the experiment. The IHTC was de-termined by solving the inverse thermal problem based on the measured temperature inside the die. Results show that the initial die surface temperature (IDST, TDI) has a dominant influence while the casting pressure and fast shot velocity have a secondary influence on the IHTC peak values. By curve fitting, it was found that the IHTC peak value (hmax) changes as a function of the IDST in a manner of hmax =eαTγDI. Such relationship between the IHTC peak value and the IDST can also be found when the casting alloy is ADC12, indicating that this phenomenon is a common characteristic in the HPDC process.Allison John 2009Science China(Technological Sciences)2009,52,1:3
7核合金的基于晶体塑性模型的集成计算材料模拟研究显示文摘核反应堆的核燃料包壳、堆内构件、蒸汽发生器等关键部件均采用耐高温腐蚀、力学性能优异的合金材料制造.合金加工工艺直接影响组织结构,进而影响其力学、腐蚀和辐照性能.核合金的堆外性能研究是合金适用性评估和改进优化的关键步骤,因此定量预测核级合金的'加工工艺-微结构-力学性能'具有重要意义.传统的核合金工艺改进与评估主要依赖于实验循环'试错法',实验成本高,研发周期长.基于全过程模拟的集成计算材料工程方法将制造工艺、材料演化与性能模型结合,显著缩短关键材料及构件的研发周期和成本.为促进该方法在核合金的工艺优化与研发中的应用,本文发展了基于合金微结构相关的晶体塑性模型和解耦有限元模拟的计算方法,对锆合金、钛合金和FeCrAl合金的'加工工艺-织构-力学性能'进行了定量预测.结果显示该集成计算方法可精确预测3种典型合金的热加工织构演化、拉伸和压缩塑性变形行为,可为核级合金的加工工艺优化和力学性能评估提供计算工具和理论依据.马显锋 位东辉 ALLISON John E 王彪 2019中国科学:物理学、力学、天文学2019,49,11:2
8Ineffective oesophageal motility:Manometric subsets exhibit different symptom profiles显示文摘AIM:To compare the demographic and clinical features of different manometric subsets of ineffective oesophageal motility(IOM;defined as ≥ 30% wet swallows with distal contractile amplitude < 30 mmHg) ,and to determine whether the prevalence of gastro-oesophageal reflux differs between IOM subsets. METHODS:Clinical characteristics of manometric subsets were determined in 100 IOM patients(73 female,median age 58 years) and compared to those of 100 age-and gender-matched patient controls with oesophageal symptoms,but normal manometry. Supine oesophageal manometry was performed with an eight-channel DentSleeve water-perfused catheter,and an ambulatory pH study assessed gastro-oesophageal reflux. RESULTS:Patients in the IOM subset featuring a majority of low-amplitude simultaneous contractions(LASC) experienced less heartburn(prevalence 26%) ,but more dysphagia(57%) than those in the IOM subset featuring low-amplitude propagated contractions(LAP;heartburn 70%,dysphagia 24%;both P ≤ 0.01) . LASC patients also experienced less heartburn and more dysphagia than patient controls(heartburn 68%,dysphagia 11%;both P < 0.001) . The prevalence of heartburn and dysphagia in IOM patients featuring a majority of non-transmitted sequences(NT) was 54%(P = 0.04 vs LASC) and 36%(P < 0.01 vs controls) ,respectively. No differences inage and gender distribution,chest pain prevalence,acid exposure time(AET) and symptom/reflux association existed between IOM subsets,or between subsets and controls. CONCLUSION:IOM patients with LASC exhibit a different symptom profile to those with LAP,but do not differ in gastro-oesophageal reflux prevalence. These findings raise the possibility of different pathophysiological mechanisms in IOM subsets,which warrants further investigation.Horst Gunter Haack Ross David Hansen Allison Malcolm John Edward Kellow 2008World Journal of Gastroenterology2008,14,23:2
9Ultrasound curriculum taught by first-year medical students: A four-year experience in Tanzania显示文摘BACKGROUND: Diagnostic imaging is an integral aspect of care that is often insufficient, if not altogether absent, in rural and remote regions of low to middle income countries(LMICs) such as Tanzania. The introduction of ultrasound can significantly impact treatment in these countries due to its portability, low cost, safety, and usefulness in various medical assessments. This study reviews the implementation of a four-week ultrasound course administered annually from 2013–2016 in a healthcare professional school in Mwanza, Tanzania by first-year allopathic US medical students.METHODS: Participants(n=582, over 4 years) were recruited from the Tandabui Institute of Health Sciences and Technology to take the ultrasound course. Subjects were predominantly clinical officer students, but other participants included other healthcare professional students, practicing healthcare professionals, and school employees. Data collected includes pre-course examination scores, post-course examination scores, course quiz scores, demographic surveys, and postcourse feedback surveys. Data was analyzed using two-tailed t-tests and the single factor analysis of variance(ANOVA).RESULTS: For all participants who completed both the pre-and post-course examinations(n=229, 39.1% of the total recruited), there was a significant mean improvement in their ultrasound knowledge of 42.5%, P<0.01.CONCLUSION: Our data suggests that trained first-year medical students can effectively teach a point of care ultrasound course to healthcare professional students within four weeks in Tanzania. Future investigation into the level of long-term knowledge retention, impact of ultrasound training on knowledge of human anatomy and diagnostic capabilities, and how expansion of an ultrasound curriculum has impacted access to care in rural Tanzania is warranted.Scan P. Denny William B. Mintccr Rcccc T.H. Fcnning Sahil Aggarwal Dcbora H. Lee Shclla K. Raja Kaavya R. Raman Allison O. Farfcl Priya A. Patcl MarkLicbcr Mcgan E. Bcrnstcin Shadi Lahham John C. Fox 2018World Journal of Emergency Medicine2018,9,1:2
10The Relationship Between Perceived Practice Quality and Quality Improvement Activities and Physician Practice Dissatisfaction, Professional Isolation, and Work-Life Stress显示文摘Mariah A. Quinn Allison Wilcox E John Orav David W. Bates Steven R. Simon 2009Medical Care2009,,8:1
11Marine water-jet propulsion 显示文摘John allison 1993SNAME Transactions1993,,:1
12Marine Waterjet Propulsion显示文摘John Allison 1993SNAME Transaction1993,,101:1
13Face recognition and aging: Effects of target age and memory load显示文摘Allison C L Steve S W John P 2005Memory and Cognition2005,33,6:1
14Recommendations for Human Epidermal Growth Factor Receptor 2 Testing in Breast Cancer: American Society of Clinical Oncology/College of American Pathologists Clinical Practice Guideline Update显示文摘Antonio C. Wolff M. Elizabeth H. Hammond David G. Hicks Mitch Dowsett Lisa M. McShane Kimberly H. Allison Donald C. Allred John M.S. Bartlett Michael Bilous Patrick Fitzgibbons Wedad Hanna Robert B. Jenkins Pamela B. Mangu Soonmyung Paik Edith A. Perez Mi 2013Journal of Clinical Oncology2013,,:1
15Marine Water jet Propulsion Transactions显示文摘ALLISON JOHN L 1993Society of Naval Architects and Marine Engineers1993,101,:1
16Predictors of Surgical Margin Status in Breast-Conserving Surgery Within a Breast Screening Program显示文摘Emil D. Kurniawan Matthew H. Wong Imogen Windle Allison Rose Arlene Mou Malcolm Buchanan John P. Collins Julie A. Miller Russell L. Gruen G. Bruce Mann 2008Annals of Surgical Oncology2008,,9:1
17Marine waterjet propulsi-on显示文摘Allison John 1993Transactions-Society of Naval Archite-cts and Marine Engineers1993,101,:1
18The use of laser desorption/ionization mass spectrometry in the analysis of inks in questioned documents显示文摘Jay Siegel John Allison Donna Mohr Jamie Dunn 2005Talanta2005,,2:1
19Marine waterjet propulsion 显示文摘John Allison 1993SNAME Transactions1993,101,:1
20Technology Utilization to Prevent Medication Errors 显示文摘Allison Fomi Hanh T Chu John Fanikos 2010Current Drug Safety2010,,5:1
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