Results 21 to 30 of about 533,559 (152)
World Medical &Health Policy, Volume 16, Issue 4, Page 774-782, December 2024.Abstract There has been longstanding international fascination with the British National Health Service since it was established in 1948. The British population itself has offered enduring support for the principles and institutions of public provision. However, coverage of the NHS has typically been uneven in academic and policy debates.
Neil Lunt, Mark Exworthy
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Conservation Biology, Volume 38, Issue 6, December 2024.Abstract Growing human use of the marine environment increases the proximity of humans to marine wildlife and thus likely increases human–wildlife interactions. Such interactions influence perceptions of nature and promote or undermine conservation. Despite their importance, human–wildlife interactions are rarely considered in ecosystem‐based marine ...
Yaara Grossmark +3 more
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An assessment of potential interventions to reduce the totoaba illegal trade market
Conservation Biology, Volume 38, Issue 5, October 2024.Abstract The illegal trade in totoaba (Totoaba macdonaldi) is causing adverse social, ecological, and economic impacts. This illegal activity is accelerating the overexploitation of totoaba and pushing the critically endangered vaquita (Phocoena sinus) closer to extinction.
Rodrigo Oyanedel +3 more
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World Medical &Health Policy, Volume 16, Issue 2, Page 116-133, June 2024.Abstract Although tobacco control efforts have been successful at reducing the rate of tobacco use in the general population, rates of use among low‐income populations persist. As a leader in tobacco control efforts, the U.S. state of California recently issued regulations regarding comprehensive tobacco cessation service requirements for state ...
Sara W. Yoeun +2 more
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, 2005 采用离子能量为100keV,剂量为3×1016cm-2的离子注入技术,室温下往n型Ge(111)单晶衬底注入Mn+离子,注入后的样品进行400℃热处理。利用X-射线衍射法(XRD)和原子力显微镜(AFM)对注入后的样品进行了结构和形貌分析,俄歇电子能谱法(AES)进行了组分分析,交变梯度样品磁强计(AGM)进行了室温磁性测量。结果表明原位注入样品的结构是非晶的,热处理后发生晶化现象。没有在样品中观察到新相形成。Mn离子较深的注入进Ge衬底,在120nm处Mn原子百分比浓度达到最高为8 ...
刘力锋 +5 more
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, 2004 本发明涉及一种雏鸡头的固定定位器，应用于脑定位操作；该固定定为器包括一透明材料制成的块状主体和一位于块状主体上表面的定位盖板；该块状主体内具有一斜向圆锥体状空洞，该圆锥体状空洞与块状主体的上表面相交形成一脑定位开口，与块状主体的侧面相交形成一头颈伸入口；所述脑定位开口与头颈伸入口相通；该圆锥体状空洞的锥度为 42°－47°，其锥体轴线与块状主体底面成42°－47°的夹角；该定位盖板上开有定位孔；采用本发明的固定定位器可迅速准确地进行雏鸡脑定位注射等操作 ...
谭北平, 杨晓燕, 肖玲, 隋南
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, 1982 本文测量了砷离子(As~+)注入的Si在连续CO_2激光辐照下光的椭圆偏振参数、反射率、表面薄层电阻率随时间的变化。从(?)、△、R、ρ的变化看出Si注入层的激光退火是在一定的时间 ...
李元恒, 王振明
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, 2003 报道了氦离子注入技术在提高980nm半导体激光器灾变性光学损伤（catastrophic optical damage，COD）阈值上的应用.p-GaAs材料经氦离子注入后可以获得的电阻率。在距离腔面25μm的区域内进行氦离子注入，由此形成腔面附近的电流非注入区。腔面附近非注入区减少了腔面载流子的注入，因此减少了非辐射复合的发生，提高了激光器的灾变性光学损伤阈值。应用氦离子注入形成腔面非注入区的管芯的平均最大功率达到440.5mW，没有发生COD现象。而应用常规工艺制作的管芯的平均COD阈值功率为407.
张敬明, 马骁宇, 肖建伟, 刘斌
core
Gaoya dianqi, 2014 电缆中间接头复合界面受潮是中压交联电缆的常见缺陷,在运行的过程中会导致界面表面电阻下降,进而产生沿面放电,逐渐降低电缆的绝缘性能,甚至直接导致电缆中间接头绝缘击穿事故,给电缆线路的安全稳定运行带来严重隐患。笔者根据电缆中间接头的结构特征建立了复合界面受潮缺陷的等效电路模型,仿真分析了不同程度受潮缺陷下,注入脉冲信号的时域反射波形图谱及其典型特征。提出了一种采用基于注入脉冲信号时域反射波法检测与定位电缆中间接头复合界面不同程度受潮缺陷的方法,并通过工业应用案例验证了该方法的有效性。
杨帆 +4 more
doaj
单用第三代头孢菌素联合维生素K1对尿毒症患者血浆凝血酶原时间的影响
Linchuang shenzangbing zazhi, 2014 目的 观察单用第三代头孢菌素与第三代头孢菌素联合维生素K1同时使用对尿毒症患者血浆凝血酶原时间(prothrombin time,PT)的影响。方法 21例尿毒症患者因感染入院,入院后以随机数字表法分组,分为A组和B组。A组患者11例,男7例,女4例,采集单独使用第三代头孢菌素治疗前、治疗后(使用头孢地嗪2.0 g,每日1次静脉滴注;或头孢哌酮舒巴坦钠2.0 g,每日2次静脉滴注)第4天晨起空腹静脉血2份;B组患者10例,男3例,女7例,在使用第三代头孢菌素治疗同时使用维生素K110 mg肌肉注射 ...
严宁
doaj