Results 11 to 20 of about 471,339 (139)
Zhongshan Daxue xuebao. Yixue kexue ban, 2007 [目的]采用单光子发射计算机断层扫描（SPECT）技术测定抑郁症患者的局部脑血流（rCBF）,与正常对照比较脑血流灌注变化,并观察抑郁症症状与患者脑血流灌注的关系。[方法]以18例未经抗抑郁治疗的抑郁症患者为研究对象,19名正常人作为对照组,分别行SPECT检查。[结果]未经治疗的抑郁患者SPECT脑血流低灌注发生率为72.2%;重症抑郁患者100%存在脑血流低灌注;抑郁组患者双侧额叶、颞叶的rCBF较对照组显著下降（P〈0.01～0.05）,左顶叶、右基底节rCBF也明显降低（P〈0.05 ...
贾艳滨, 黄立安, 徐伊, 徐浩
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Zhongshan Daxue xuebao. Yixue kexue ban, 2006 【目的】探讨体外循环中低流量肺动脉灌注对肺功能影响的作用机理。【方法】体质量18-22kg的杂种犬10只，随机分为对照组（n=5）和肺灌注组（n=5）。常规建立体外循环。肺灌注组用氧合血30mL／（kg·min）灌注肺动脉。分别于转流前，停体外循环即刻，转流后1h，转流后2h采集数据，计算氧合指数、肺动态顺应性。检测肺静脉血丙二醛（MDA）、超氧化物歧化酶（SOD）、细胞间黏附分子1（ICAM-1）和P选择素。【结果】转流后肺灌注组犬的肺动态顺应性和氧合指数明显高于对照组（P〈0．05 ...
周成斌 +5 more
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Zhongshan Daxue xuebao. Yixue kexue ban, 1999 目的: 探讨不同流量主动脉转流对腹主动脉暂时性阻断所引起肝、肾和小肠等内脏缺血再灌注损伤的影响。方 法: 实验建立在小猪腹腔动脉开口以上阻断腹主动脉 1 h和同时辅助主动脉转流的模型, 检测在不同再灌注时点肝、肾、小肠 组织及血液中丙二醛( MDA)和超氧化物歧化酶( SOD)的变化,同时检测主要肝肾功能、动脉血气分析。结果: 50%流量组的血 和组织中 MDA 含量和 SOD 的活性在几个再灌注时点与同组的缺血前比较差异有显著性, 且在再灌注 2 h 时 BUN 、pH 和 HCO3 ...
邓美海 区庆嘉 刘 超 刘晓平 彭世军
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, 1983 塑料注模成型是塑料加工的主要方法之一。先由注塑机加压使熔融热塑料经导管通过一个或几个“门”进入加工精细的冷模,直到充满整个模型。这是第一阶段。充满后提高压力(或保持压力)一段时间,再注入一些热塑料以补偿以后冷却时的体积收缩。停止注入后的自然冷却是笫三阶段。当然这方面化工的研究是主要的,然而流体力学也有其一席之地,因为虽然单个塑料制品很便宜,但模型及注塑机很贵,所以应用流体力学理论来判断所设计的模型及注塑机能否达到要求(例如,在给定压力下能否充满整个模型)是很有价值的 ...
陈允明
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, 1983 本文叙述了为解决通讯中断问题而设计的平板雾化试验的实验方法、设备及初步的实验结果。讨论了液体射流注入高温高速气流后破碎的情况及破碎后液滴的运动轨迹、雾化区域。研究了液滴运动轨迹和气流参数、注入液体的压力及注入喷嘴的直径等参数的关系。最后介绍了液滴运动轨迹的计算方法 ...
陆志云, 林烈
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A systematic review of avian influenza virus transmission models: Gaps and opportunities
Methods in Ecology and Evolution, EarlyView.Abstract Highly pathogenic avian influenza virus (HPAIV) increasingly threatens wild birds, poultry, non‐human mammals and humans, yet gaps and opportunities in avian influenza virus (AIV) transmission modelling have not been comprehensively synthesized.
Shenglai Yin +7 more
wiley +1 more source
Intact coastal nursery rearing amid climate‐driven phenological shifts in threatened salmon
Conservation Biology, EarlyView.Abstract Literature linking phenology to climate has proliferated in recent decades and shows that climate change has reorganized seasonal opportunities worldwide. However, this literature often quantifies changes in point measures of timing (e.g., beginnings and peaks) without context about duration (e.g., rearing season length) or performance (e.g ...
Stuart H. Munsch +8 more
wiley +1 more source
Integrating biodiversity protection into emergency management
Conservation Biology, EarlyView.Abstract Megafires have emerged as a considerable threat to biodiversity conservation worldwide. The biodiversity‐focused response and recovery actions that occurred during Australia's 2019/2020 Black Summer bushfires demonstrate that it is possible to protect biodiversity alongside human life and property during disasters.
Jacey Roche Cerda +2 more
wiley +1 more source
The Academic Literacy of International Postgraduate Students in Australia: A Cause for Concern?
International Journal of Applied Linguistics, EarlyView.ABSTRACT This article discusses the academic literacy challenges faced by international postgraduate students at a South Australian university and evaluates the effectiveness of existing institutional support mechanisms. Drawing on survey data, the study highlights significant difficulties in academic reading, writing, and spoken communication, with ...
Werner Botha +6 more
wiley +1 more source
, 2015 塔里木油田分层注水、注气井存在超深、高温、高压的特点,注入流体物性沿井深变化大,为了满足计算精度,必须充分考虑流体物性的变化。常见的注水水嘴计算方法无法达到精度要求,而注气水嘴的计算方法也未见报道。为此提出了满足塔里木油田分注要求的分层配注水嘴尺寸计算方法,由管柱中的流动得到嘴前压力、注入指数曲线得到注入压力,利用嘴前压力和注入压力,通过嘴流方程得到水嘴尺寸。在计算中需要考虑注水和注气在管流和嘴流方面的差别,充分考虑流体物性随温度和压力的变化,沿井深划分小段进行计算。此外 ...
周理志 +5 more
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