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6117篇 您的检索式:作者名="ATKINSON"
    题名 作者 年代 出处 被引量
1磁障转子无刷双馈电机显示文摘为了研究在转子铁心中引入磁障对磁阻转子无刷双馈电机性能的影响,基于场路耦合有限元分析,对比研究了转子极弧系数与磁障数量及结构参数对无刷双馈磁阻电机性能的影响,并在此基础上,提出了一种结构简单、性能较好的无刷双馈磁障转子设计方案。通过样机实验,验证了该磁障转子无刷双馈电机的设计方法及其双馈运行特性。理论分析和实验研究结果表明:在电机结构尺寸相同情况下,通过在转子铁心中适当引入磁障,可以有效地改善磁阻转子无刷双馈电机的性能,并使其保留普通磁阻转子结构简单和成本低廉的优点。张岳 王凤翔 邢军强 Milutin Jovanovic David Atkinson 2012电工技术学报2012,27,7:23
2简介英国国家卫生医疗质量标准署新生儿黄疸诊治建议显示文摘英国国家卫生医疗质量标准署(National Institute for Health and Clinical Excellence,NICE)2010年出版了关于新生儿黄疸诊治的指南,主要内容涉及:生后28天之内新生儿黄疸的管理;如何评估、诊断及治疗新生儿黄疸;密切观察、光疗及换血等三种主要治疗方式。张铭涛 童笑梅 Atkinson M Budge H 2012中国新生儿科杂志2012,27,4:11
3焦炭特性及其在高炉下部的变化过程显示文摘气化、石墨化和溶解是影响焦炭从高炉软熔带至炉缸间行为的三个主要过程。过去几年在一些专题项目中对这些过程进行了研究。简要叙述并讨论了这些过程的相互作用及其与焦炭特性的关系。对焦炭的气化反应进行了实验室测试研究,用以评价高炉条件下焦炭的特性。用高炉条件下的气化测试装置测试了几种焦炭试样,考查的质量指标包括反应性、结构变化和强度等。用实际尺寸的焦炭块对块状焦炭试样的高温行为进行了评估,将不同种类的焦炭试样加热到2 000℃,以鉴别其在高温下的行为。高温下焦炭将发生石墨化,对高温反应后的强度进行了评定,并作了显微观察,发现了一些现象和组织结构的变化。焦炭与液态渣铁相互作用的研究结果对焦炭在高炉下部的行为有了更好的理解。通过试验研究了焦炭抗液态铁水溶解的性能,对入炉前的焦炭和经高温反应的焦炭分别进行了试验。分析讨论了焦炭的抗气化、抗石墨化和抗铁水溶解性能与其结构、化学成分和强度的关系。B van der Velden C J Atkinson T Bakker J R H Stuurwold G J Tijhuis 徐万仁 2014世界钢铁2014,,2:11
4以便秘和腹泻为主的肠易激综合征与5-羟色胺信号改变显示文摘Background &Aims: Evidence suggests that postprandial platelet-depleted plasma 5-hydroxytryptamine (5-HT) concentrations may be abnormal in irritable bowel syndrome (IBS). However, interpretation of the data has been hampered by the variable methodology and rather small numbers used in previous studies. Therefore, the aim of this study was to measure concentrations of platelet-depleted plasma 5-HT and its metabolite 5-HIAA under fasting and fed conditions in a large group of patients with diarrhea-predominant (d-) and constipation-predominant (c-) IBS, compared with controls. The ratio of plasma 5-HIAA:5-HT and platelet stores was also assessed. Methods: Twenty-nine c-IBS patients (aged, 19-53 years), 55 d-IBS patients (aged, 19-52 years), and 35 healthy volunteers (aged, 18-46 years) had platelet-depleted plasma 5-HT/5-HIAA concentrations measured using reverse-phase, high-performance liquid chromatography with fluorimetric detection before and after a standard meal. Results: d-IBS patients had raised platelet-depleted plasma 5-HT concentrations under fasting and fed conditions (P < .05). However, the postprandial relative to fasting concentration was similar to controls. In contrast, c-IBS patients failed to show an increase in platelet-depleted plasma 5-HT concentration with meal ingestion compared with controls (P < .01). c-IBS was associated with decreased 5-HIAA (P < .01) but normal 5-HIAA:5-HT ratio and d-IBS with normal 5-HIAA concentrations but reduced 5-HIAA:5-HT ratio (P < .005). c-IBS but not d-IBS patients had increased platelet 5-HT. Conclusions: These results support the concept that d-IBS is characterized by reduced 5-HT reuptake, whereas impaired release may be a feature of c-IBS. These results also provide a rational basis for current pharmacologic approaches involving modulation of different 5-HT receptors in c-and d-IBS.Atkinson W. Lockhart S. Whorwell P. J. L.A. Houghton. 李宏宇(译) 郑世成(校) 2006世界核心医学期刊文摘(胃肠病学分册)2006,2,6:8
5人类免疫缺陷病毒感染者抑郁障碍、自杀风险和日常生活能力的研究显示文摘目的研究人类免疫缺陷病毒(H IV)感染者抑郁症和自杀观念的流行情况及其与日常生活能力改变的关联。方法对28例H IV阳性者及23例H IV阴性者,用复合性国际诊断用检查提纲中文版调查抑郁症的总发生率和自杀史,用贝克抑郁问卷(BD I)评估当前抑郁障碍及自杀风险的严重程度,用日常生活能力问卷(ADL)评估H IV感染对日常生活能力的影响。结果(1)H IV阳性组和H IV阴性组中分别有22例(79%)和1例(4%)符合抑郁症的诊断标准(P<0.001);H IV阳性组BD I总分[(22.4±12.7)分]高于H IV阴性组[(6.6±7.8)分;P<0.001]。(2)H IV阳性组和H IV阴性组中分别有18例(64%)和2例(9%)有过自杀观念。(3)H IV阳性组ADL总分[(17.1±5.2)分]高于H IV阴性组[(14.0±0.0)分;P<0.001]。(4)BD I与H IV状况的交互作用是有显著贡献(F=23.95,P<0.001)的自变量,抑郁障碍与H IV状况的相互作用是有意义(F=13.29,P=0.001)的预测因子。结论H IV感染的人群中抑郁症的发生率及自杀风险均较高,抑郁的严重程度和日常生活能力受损有显著相关性。于欣 石川 金华 J.Hampton Atkinson Robert Heaton Thomas Marcotte Corinna Young Joseph Sadek 吴尊友 Igor Grant 2006中华精神科杂志2006,39,2:8
6Global and regional mortality from 235 causes of death for 20 age groups in 1990 and 2010: a systematic analysis for the Global Burden of Disease Study 2010显示文摘Rafael Lozano Mohsen Naghavi Kyle Foreman Stephen Lim Kenji Shibuya Victor Aboyans Jerry Abraham Timothy Adair Rakesh Aggarwal Stephanie Y Ahn Mohammad A AlMazroa Miriam Alvarado H Ross Anderson Laurie M Anderson Kathryn G Andrews Charles Atkinson Larry M 2012The Lancet . 2012 (9859)2012,,9859:7
7三元体系Na_2SO_4-CuSO_4-H_2O25℃活度系数的研究显示文摘用自制的Hg-Hg_2SO_4电极和Na离子选择性电极,在25℃和离子强度分别为1.0和2.0的条件下,测定了Na_2SO_4在Na_2SO_4和CuSO_4混合水溶液中的平均活度系数。对所使用的电极组的热力学响应、重现性等性能进行了检验。根据文献提供的Pitzer方程,推导了计算Na_2SO_-CuSO_4-H_2O体系中Na_2SO_4和CuSO_4平均活度系数的表达式,求出了Pitzer混合参数和Harned方程系数,计算了CuSO_4在该体系中的平均活度系数。姚燕 Atkinson G 1991物理化学学报1991,7,1:6
8非肥胖型糖尿病小鼠唾液流率、颌下腺造影及病理研究显示文摘目的 :研究非肥胖型糖尿病小鼠 (nonobesediabeticmouse ,NOD)唾液总流率 ;颌下腺造影及病理表现。材料及方法 :本研究将 5 6只NOD小鼠分 9周、16周、2 0周及 2 4周 4个不同年龄组测定其唾液总流率 ,颌下腺造影及颌下腺病理学研究 ,用 32只Balb/c小鼠分同样年龄组进行对照。结果 :NOD小鼠唾液总流率随年龄增大而下降 ,Balb/c小鼠则变化不大。 2 0周以后NOD小鼠颌下腺造影有造影剂外溢 ,排空功能明显迟缓。 9周NOD小鼠颌下腺见淋巴细胞浸润 ,随年龄增长 ,淋巴细胞浸润加重。结论 :NOD小鼠涎腺的形态及功能均明显受累 ,与人类SS表现类似。王松灵 Bruce Baum Di Sun Jane Atkinson 2002北京口腔医学2002,10,2:6
9Cystic lymphangioma of the pancreas显示文摘Lymphangioma of the pancreas is an extremely rare benign tumour of lymphatic origin,with fewer than 60 published cases. Histologically,it is polycystic,with the cysts separated by thin septa and lined with endothelial cells. Though congenital,it can affect all age groups,and occurs more frequently in females. Patients usually present with epigastric pain and an associated palpable mass. Complete excision is curative,even though,depending on the tumour location,surgery may be simple or involve extensive pancreatic resection and anastomoses. The authors present a 49-year-old woman in whom a polycystic septated mass,35 mm x 35 mm in size,was discovered by ultrasonography (US) in the body of the pancreas during investigations for epigastric pain and nausea. At surgery,a well circumscribed polycystic tumor was completely excised,with preservation of the pancreatic duct. The postoperative recovery was uneventful. Histology confirmed a microcystic lymphangioma of the pancreas. Immunohistochemistry showed cystic endothelial cells reactivity to factor Ⅷ -RA (++),CD31 (+++) and CD34 (-). Postoperatively,abdominal pain disappeared and the patient remained symptomfree for 12 mo until now. Although extremely rare,lymphangioma of the pancreas should be taken into consideration as a differential diagnosis of a pancreatic cystic lesion,especially in women.Radoje B Colovic Nikica M Grubor Marjan T Micev Henry Dushan E Atkinson Vitomir I Rankovic Mihajlo M Jagodic 2008World Journal of Gastroenterology2008,14,44:6
10How to perform gastrointestinal ultrasound: anatomy and normal findings显示文摘Gastrointestinal ultrasound is a practical, safe, cheap and reproducible diagnostic tool in inflammatorybowel disease gaining global prominence amongst clinicians. Understanding the embryological processes of the intestinal tract assists in the interpretation of abnormal sonographic findings. In general terms, the examination principally comprises interrogation of the colon, mesentery and small intestine using both lowfrequency and high-frequency probes. Interpretation of findings on GIUS includes assessment of bowel wall thickness, symmetry of this thickness, evidence of transmural changes, assessment of vascularity using Doppler imaging and assessment of other specific features including lymph nodes, mesentery and luminal motility. In addition to B-mode imaging, transperineal ultrasonography, elastography and contrast-enhanced ultrasonography are useful adjuncts. This supplement expands upon these features in more depth.Nathan S S Atkinson Robert V Bryant Yi Dong Christian Maaser Torsten Kucharzik Giovanni Maconi Anil K Asthana Michael Blaivas Adrian Goudie Odd Helge Gilja Dieter Nuernberg Dagmar Schreiber-Dietrich Christoph F Dietrich 2017World Journal of Gastroenterology2017,23,38:5
11Key factors determining biochar sorption capacity for metal contaminants:a literature synthesis显示文摘The sorption capacity and affinity of biochar for metals are both important attributes that determine biochar’s suitability as a soil amendment for contaminant mitigation,yet few analyses have considered both characteristics simultaneously.We present a systematic review of literature published between 2010 and 2018 to test the hypothesis that sorption capacity and affinity are affected by biochar properties,attributes of the metal contaminant,and experimental conditions,in that order.We used random forest(RF)and multi-objective optimization to analyze data of 559 individual Langmuir adsorption isotherms extracted from 133 studies covering the sorption capacity(C_(max))and affinity(K_(L))of biochar for 17 different metals,elabo-rated from six different feedstock classes,three different types of feedstock pretreatment,and five types of post-pyrolysis treatment.Highest sorption values were obtained for Pb(II),Cr(IV),and Cd(II).The feedstock used was the key determinant influencing biochar’s capacity and affinity to sorb metal contaminants(first and fourth most important variable in RF mod-els for C_(max) and K_(L),respectively)with best results obtained for biochar elaborated from nutrient-dense feedstocks(animal biowaste,sludge,and manure).Biochars that had both high sorption capacity and affinity were the result of a longer dura-tion of pyrolysis;they had lower C and higher N and O content,as well as lower C/N and higher O/C and H/C ratios,higher pore volumes and higher pH.Applying some form of pretreatment was better than none,whereas chemical modification was the best of the post-treatment methods analyzed.This review demonstrates clearly that multiple parameters during the preparation process influence the effectiveness of biochar to immobilize metal contaminants.Future research that focuses on mechanisms and the underlying factors for the correlations observed should allow the development of biochar formulations that are even more effective at immobilizing metal contaminants in soils and sediments.Evert Thomas Nils Borchard Christian Sarmiento Rachel Atkinson Brenton Ladd 2020Biochar2020,2,2:5
12Global and regional mortality from 235 causes of death for 20 age groups in 1990 and 2010: a systematic analysis for the Global Burden of Disease Study 2010显示文摘Rafael Lozano Mohsen Naghavi Kyle Foreman Stephen Lim Kenji Shibuya Victor Aboyans Jerry Abraham Timothy Adair Rakesh Aggarwal Stephanie Y Ahn Mohammad A AlMazroa Miriam Alvarado H Ross Anderson Laurie M Anderson Kathryn G Andrews Charles Atkinson Larry M 2012The Lancet2012,,9859:5
13雷公藤免疫调节的体外研究显示文摘目的证实雷公藤能否选择性地抑制LPS、PHA诱导的TNFα、IFNγ的产生,以及它抑制TNFα的免疫学机理。方法采用健康供血者外周血单个核细胞(PBMC)的体外培养及ELISA,测量雷公藤甲素抑制由LPS、PHA诱导的TNFα、IFNγ的能力;通过对PBMC和单核细胞(monocyte)的预处理试验,以及其后的流式细胞仪分析,研究雷公藤抑制TNFα的免疫学机理。结果雷公藤对TNFα、IFNγ的抑制具有剂量依赖性,对TNFα的IC50为5~10ngml,对IFNγ的IC50为0.1~1.0ngml。PBMC和monocytes试验中,雷公藤的不同预处理后的TNFα浓度,与流式细胞分析产生效应的CD14+TNFα+细胞数一致。结论两种预处理方法提示了不同的临床意义。免疫表现型的分析揭示,雷公藤可能与LPS竞争结合CD14受体。该研究为雷公藤可作为抗炎剂治疗麻风反应提供了基本依据。翁小满 Atkinson S Gorak-Stolinska P Dockrell H.M 2004中华微生物学和免疫学杂志2004,24,12:4
14面向对象的数据库系统宣言显示文摘这篇文章试图定义面向对象的数据库系统。它描述了作为一个合格的面向对象的数据库系统所应具备的主要性质和特征。我们把这些特性分成了三组: ·必备的:被称作面向对象的数据库系统所必须满足的特性。它们是复杂对象,对象标识,封装性,类型或类,继承性,结合滞后联编的复载,可扩充性,计算完备性,持久性,辅存管理,并发性,恢复和即席查询功能。·可选的:为了使系统更完善可添加的而非必备的特性。它们是多重继承性,类型检查和推理,分布,设计事务处理和版本。·开放的:设计人员可以选择的特性。它们是程序设计范例,表示系统,类型系统及一致性。我们的立场是,不祇望上述看法成为一个里程碑,以便为进一步的讨论指明方向。Malcolm Atkinson Francois Bancilhon David Dewitt Klaus Dittrich David Maier Stanley Zdonik 王宗斌 王珊 1990计算机科学1990,17,3:3
15A comparative risk assessment of burden of disease and injury attributable to 67 risk factors and risk factor clusters in 21 regions, 1990–2010: a systematic analysis for the Global Burden of Disease Study 2010显示文摘Stephen S Lim Theo Vos Abraham D Flaxman Goodarz Danaei Kenji Shibuya Heather Adair-Rohani Mohammad A AlMazroa Markus Amann H Ross Anderson Kathryn G Andrews Martin Aryee Charles Atkinson Loraine J Bacchus Adil N Bahalim Kalpana Balakrishnan John Balmes S 20122012 (9859)2012,,9859:3
16Serous pancreatic neoplasia, data and review显示文摘AIM To describe the imaging features of serous neoplasms of the pancreas using ultrasound, endoscopic ultrasound, computed tomography and magnetic resonance imaging.METHODS This multicenter international collaboration enhances a literature review to date, reporting features of 287 histologically confirmed cases of serous pancreatic cystic neoplasms(SPN). RESULTS Female predominance is seen with most SPN presenting asymptomatically in the 5th through 7th decade. Mean lesion size was 38.7 mm, 98% were single, 44.2% cystic, 46% mixed cystic and solid, and 94% hypoechoic on B-mode ultrasound. Vascular patterns and contrast-enhancement profiles are described as hypervascular and hyperenhancing.CONCLUSION The described ultrasound features can aid differentiation of SPN from other neoplastic lesions under most circumstances.Christoph F Dietrich Yi Dong Christian Jenssen Valentina Ciaravino Michael Hocke Wen-Ping Wang Eike Burmester Kathleen Moeller Nathan SS Atkinson Paola Capelli Mirko D’Onofrio 2017World Journal of Gastroenterology2017,23,30:3
17Immune modulation of effector CD4+ and regulatory T cell function by sorafenib in patients with hepatocellular carcinoma显示文摘Roniel Cabrera Miguel Ararat Yiling Xu Todd Brusko Clive Wasserfall Mark A. Atkinson Lung Ji Chang Chen Liu David R. Nelson 2013Cancer Immunology Immunotherapy2013,,4:3
18A complement-dependent balance between hepatic ischemia/reperfusion injury and liver regeneration in mice显示文摘He Songqing Atkinson Carl Qiao Fei Cianflone Katherine Chen Xiaoping Tomlinson Stephen 2009Journal of Clinical Investigation2009,,8:2
19游泳运动员的热身和拉伸显示文摘在进行拉伸时,运动员必须保证拉伸的合理限度,避免过于疼痛每次拉伸应该保持三十秒左右,吸气时拉伸,吐气时放松回至原位整套热身活动应该持续十五分钟左在正式游泳iJ}l练之前,除进行大多数常规的热身方式外,还要融合一些特定的拉伸活动,以满足个体需要瑞士球就是一种进行拉伸练习的有效器材)瑞士球有不同的尺寸,在购买之前应咨询相关专家,弄清楚什么尺寸的球是适合自己的。一般来说,坐在瑞士球上面时,以大腿和小腿保持垂直。顾小叶 张新 袁锐 Bill Sweetenham John Atkinson 2012游泳2012,,1:2
20Insights into the Microwave Instruments Onboard the Fengyun 3D Satellite:Data Quality and Assimilation in the Met Office NWP System显示文摘This paper evaluates the microwave instruments onboard the latest Chinese polar-orbiting satellite, Fengyun 3D (FY- 3D). Comparing three months of observations from the Microwave Temperature Sounder 2 (MWTS-2), the Microwave Humidity Sounder 2 (MWHS-2), and the Microwave Radiation Imager (MWRI) to Met Office short-range forecasts, we characterize the instrumental biases, show how those biases have changed with respect to their predecessors onboard FY- 3C, and how they compare to the Advanced Technology Microwave Sounder (ATMS) onboard NOAA-20 and the Global Precipitation Measurement Microwave Imager (GMI). The MWTS-2 global bias is much reduced with respect to its predecessor and compares well to ATMS at equivalent channel frequencies, differing only by 0.36 ± 0.28 K (1σ) on average. A suboptimal averaging of raw digital counts is found to cause an increase in striping noise and an ascending- descending bias. MWHS-2 benefits from a new calibration method improving the 183-GHz humidity channels with respect to its predecessor and biases for these channels are within ± 1.9 K to ATMS. MWRI presents the largest improvements, with reduced global bias and standard deviation with respect to FY-3C;although, spurious, seemingly transient, brightness temperatures have been detected in the observations at 36.5 GHz (vertical polarization). The strong solar-dependent bias that affects the instrument on FY-3C has been reduced to less than 0.2 K on average for FY-3D MWRI. Experiments where radiances from these instruments were assimilated on top of a full global system demonstrated a neutral to positive impact on the forecasts, as well as on the fit to the background of independent instruments.Fabien CARMINATI Nigel ATKINSON Brett CANDY Qifeng LU 2021Advances in Atmospheric Sciences2021,38,8:2
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