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23篇 您的检索式:作者名="P.SMITH"
    题名 作者 年代 出处 被引量
1Climatic and Edaphic Controls on Soil pH in Alpine Grasslands on the Tibetan Plateau,China:A Quantitative Analysis显示文摘Soil acidity is an important parameter that can regulate ecosystem structure and function.However,a quantitative understanding of the relationships between soil pH and environmental factors remains unavailable.In this study,relationships of soil pH with both climatic and edaphic factors in alpine grasslands on the Tibetan Plateau,China were quantified using data obtained from a regional soil survey during 2001-2004.Our results showed that soil pH decreased along the gradient of both mean annual temperature and precipitation.Likewise,soil pH exhibited consistent negative correlations with soil moisture and silt content.However,soil organic and inorganic carbon contents played opposite roles in shaping patterns of soil pH:the accumulation of soil organic matter led to higher soil acidity,while the existence of soil inorganic matter was favorable for maintaining higher soil alkalinity.The variation partitioning analysis indicated that the combination of climatic and edaphic variables explained 74.3%of the variation in soil acidity.These results suggest that soil pH could be predicted from routinely-measured variables,allowing a robust pedotransfer function to be developed.The pedotransfer function may facilitate land surface models to generate more reliable predictions on ecosystem structure and function around the world.JI Cheng-Jun YANG Yuan-He HAN Wen-Xuan HE Yan-Fang J.SMITH P.SMITH 2014Pedosphere2014,24,1:5
2The role of carbonate-fluoride melt immiscibility in shallow REE deposit evolution显示文摘The Lugiin Gol nepheline syenite intrusion, Mongolia, hosts a range of carbonatite dikes mineralized in rare-earth elements(REE). Both carbonatites and nepheline syenite-fluorite-calcite veinlets are host to a previously unreported macroscale texture involving pseudo-graphic intergrowths of fluorite and calcite. The inclusions within calcite occur as either pure fluorite, with associated REE minerals within the surrounding calcite, or as mixed calcite-fluorite inclusions, with associated zirconosilicate minerals. Consideration of the nature of the texture, and the proportions of fluorite and calcite present(~29 and 71 mol%,respectively), indicates that these textures most likely formed either through the immiscible separation of carbonate and fluoride melts, or from cotectic crystallization of a carbonatefluoride melt. Laser ablation ICP-MS analyses show the pure fluorite inclusions to be depleted in REE relative to the calcite. A model is proposed, in which a carbonate-fluoride melt phase enriched in Zr and the REE, separated from a phonolitic melt, and then either unmixed or underwent cotectic crystallization to generate an REE-rich carbonate melt and an REE-poor fluoride phase. The separation of the fluoride phase(either solid or melt) may have contributed to the enrichment of the carbonate melt in REE, and ultimately its saturation with REE minerals. Previous data have suggested that carbonate melts separated from silicate melts are relatively depleted in the REE, and thus melt immiscibility cannot result in the formation of REE-enriched carbonatites. The observations presented here provide a mechanism by which this could occur, as under either model the textures imply initial separation of a mixed carbonate-fluoride melt from a silicate magma. The separation of an REEenriched carbonate-fluoride melt from phonolitic magma is a hitherto unrecognized mechanism for REE-enrichment in carbonatites, and may play an important role in the formation of shallow magmatic REE deposits.Jindrich Kynicky Martin P.Smith Wenlei Song Anton R.Chakhmouradian Cheng Xu Antonin Kopriva Michaela Vasinova Galiova Martin Brtnicky 2019Geoscience Frontiers2019,10,2:3
3儿童肾上腺CT形态学显示文摘本文介绍儿童正常肾上腺的CT形态学和在4.8秒扫描条件下的显示率。朱大成 Phillip P.Smith 1986临床放射学杂志1986,5,1:3
4Financial Decision Making and Cognition in a Family Context*显示文摘James P.Smith John J.McArdle RobertWillis 2010The Economic Journal2010,,548:2
5同时进食对利福平、异烟肼以及吡嗪酰胺生物利用度的影响显示文摘背景:为了使病人更好地配合治疗并改善他们的营养状态,有人曾建议在进食的同时服用抗结核药(这可以减少与吡嗪酰胺有关的呕吐)。然而食物有可能降低经口给与的利福平和异烟肼的生物利用度。目的和方法;在27名结核病病人(男性15,女性12)进行了三重交叉药代动力学研究以比较不进食(对照)和进食高碳水化合物(CHO)或高脂质(LIPID)饮食情况下利福平、异烟肼和吡嗪酰胺的生物利用度。结果:CHO饮食降低了异烟肼的生物利用度。测得的最高药物浓度(Cm)减少了20%(P=0.0002)。8小时内的浓度-时间曲线下面积(AUC8)减少了19%(P=0.01)。CHO饮食使利福平达到最高浓度(Tmax)的时间延长了21%(P=0.03)。LIPID饮食使异烟肼的Cm降低了9%(P=0.03)。每次吃饭的个体病人的生物利用度与不进食的对照的生物利用度进行了比较。Cm或AUC8下降超过20%被认为有显著意义。占很大比率的病人中(33-56%),异烟肼和利福平的生物利用度都因进食而有所下降。结论:同时进食对药物治疗结核病可能有重大的不良影响。认为药物与饮食同时服用可取的观点是可疑的。C.Zent P.Smith 雷海鹏 1996国际结核病与肺部疾病杂志1996,0,3:2
6On the Labor-Supply Effects of Age-Related Income Main-tenance Programs显示文摘James P.Smith 0,,10:1
7Potential carbon stock in Japanese forest soils – simulated impact of forest management and climate change using the CENTURY model显示文摘S.Hashimoto S.Ugawa K.Morisada M.Wattenbach P.Smith Y.Matsuura 2012Soil Use and Management2012,,1:1
8High pressure destruction kinetics of Rscherichia coli(O157:H7)and Listeria monocytogenes(Scott A)in a fish slurry显示文摘Hosahali S.Ramaswamy Shafi Ullah Zaman James P.Smith 0,,01:1
9Australias Frozen Orphan Embryos:A Medical,Legal,and Ethical Dilemma显示文摘George P.Smith II 0,,:1
10Global change, soil biodiversity, and nitrogen cycling in terrestrial ecosystems: three case studies显示文摘M. J.SWIFT O.ANDRéN L.BRUSSAARD M.BRIONES M. ‐M.COUTEAUX K.EKSCHMITT A.KJOLLER P.LOISEAU P.SMITH 2004Global Change Biology2004,,7:1
11Activated protein C inhibits lipopolysaccharide‐induced nuclear translocation of nuclear factor κB (NF‐κB) and tumour necrosis factor α (TNF‐α) production in the THP‐1 monocytic cell line显示文摘B.White M.Schmidt C.Murphy W.Livingstone D.O’Toole M.Lawler L.O’Neill D.Kelleher H. P.Schwarz O. P.Smith 2001British Journal of Haematology2001,,1:1
12Structural Analysis of Cointegrating VARs显示文摘M. HashemPesaran Ron P.Smith 2002Journal of Economic Surveys2002,,5:1
13用于空气过滤的带电纤维显示文摘虽然不带电纤维在空气过滤中作为机械性过滤的介质很理想,但其过滤的效率偏低,特别是对粒子直径小于或等于7μm的灰尘的过滤效率更是低。一般来说,普通纤维的直径为20μm,当作为过滤的介质时。P.Smith 顾向琼 1991国外纺织技术(化纤.染整.环境保护分册)1991,,3:0
14Integrating Leadership Diversity:A Social Worker’s Role during COVID-19显示文摘This article explores the impact of social work leadership integration and diversity and its response during the COVID-19 pandemic and its daily application.Social workers used various modalities to ensure that immediate priority was given to those individuals who were needed in various agencies and schools.Social workers provided added value and were essential to providing vital support through leadership skills in the development and operation during the COVID-19 pandemic.The social workers and leaders demonstrated the ability to intervene during the pandemic crisis through the infusion of a variety of leadership practices and integration.The profession itself makes social workers innate leaders.In the article,attention is given to the work that social workers embraced during the COVID-19 pandemic,to demonstrate that front-line workers are real experts.Social workers as leaders are guided by the code of ethics which employs a leadership style.M.Tucker Frederick M.G.Evans Macie P.Smith 2023Journal of Literature and Art Studies2023,13,11:0
15Sex differences in the foraging behavior of a generalist hawkmoth显示文摘Within-species variation in pollinator behavior is widely observed, but its causes have been minimally investigated. Pollinator sex is associated with large differences in behavior that may lead to predictable differences in flower foraging, but this expectation has not been explicitly tested. We investigate sex-associated differences in nectar-foraging behavior of the hawkmoth Hyles lineata, using pollen on the proboscis as a proxy for flower visitation. We tested two predictions emerging from the literature: (1) the sexes differ in the flower species they visit, (2) females are more specialized in flower choice. We also examined potential drivers underlying these predictions by performing field and laboratory experiments to test whether males (3) switch among flower species more frequently, or (4) fly farther and therefore encounter more species than females. Consistent with prediction (1), pollen load composition differed between the sexes, indicative of visitation differences. Contrary to prediction (2), females consistently carried more species-rich pollen loads than males. (3) Both sexes switched between flower species at similar rates, suggesting that differences in floral fidelity are unlikely to explain why females are less specialized than males. (4) Males flew longer distances than females;coupled with larger between-site differences in pollen composition for females, this result suggests that sex differences in mobility influence foraging, and that females may forage more frequently and in smaller areas than males. Together, our results demonstrate that sex-associated foraging differences can be large and consistent over time, and highlight the importance of sex as a driver of variation in pollinator behavior.Gordon P.Smith Goggy Davidowitz Ruben Alarcón Daniel R.Papaj Judith L.Bronstein 2022Insect Science2022,29,1:0
16泰坦尼克的沉没——审视领导的失败显示文摘“我们撞上冰山……迅速下沉……快来营救。”在1912年的一个寒冷深夜里,无线电波传来噩耗。泰坦尼克号巨轮终于坠入海底墓穴,而这些文字成为1200名丧生者的墓志铭。当时最大、最先进的“泰坦尼克”为何沉没了呢? 所有研究泰坦尼克者,或者至少看过电影《泰坦尼克号》的人,都明白这到底是因为什么。制造灾难的罪魁祸首是冰山吗?在我看来,泰坦尼克沉没于领导的失败! 泰坦尼克仍静卧海底,但我们能够找到事实真相,其中的教训可以帮助我们在事业和能力上获得提高。晓夏 Gregory P.Smith 1998IT经理世界1998,1,18:0
17初生仔猪的哺乳显示文摘本文介绍加拿大科学工作者关于新生仔猪哺乳方法的研究结果。习惯上,饲养员护理弱小仔猪时,都是辅助小猪吃母猪前部乳头的奶,这样能保证弱小仔猪能吃上含有防病的免疫因子的初乳。但是,加拿大科学工作者研究证实,如果让初生仔猪能从几个乳头吃初乳,那么就可以获得较多的免疫因子。据测定,出生后12小时仔猪的血清免疫球蛋白G(lgG),从5个乳头吃奶的仔猪的血清lgG含量较高。仔猪免疫球蛋白的水平与仔猪出生次序有关。研究结果表明,后产的仔猪的lgG水平较先产出者的低。前8头仔猪间血清lgG水平差别很小,第8头之后则急剧下降。现在,猪育种者开始重视培育多产母系,希望窝产仔数在8头以上。这就应注意防止母猪转移给仔猪的抗病免疫力下降的问题。对后出生的仔猪要给予特别护理。初乳中的免疫球蛋白是母猪受到疾病侵袭或免疫注射后,产生的蛋白质抗体。仔猪在出生后几小时内能吃到初乳,对其成活和生长是至关重要的。P.Smith 吴永文 1989国外畜牧科技1989,16,6:0
18Chewing gum and stress reduction显示文摘The behavioral effects of chewing gum have been studied for over 80 years and much of the research has been concerned with increases in alertness and attention.Another line of research has addressed the issue of whether chewing gum reduces stress.This topic has been studied in the laboratory,in epidemiological studies and real-life interventions.Relevance for patients:The present article briefly reviews the area and makes the case for dissemination of the findings with the aim of reducing stress in the general population and patient groups.Andrew P.Smith 2016Journal of Clinical & Translational Research2016,2,2:0
19当代化妆品显示文摘由于化妆品范畴的扩展,它汲取于其它纯科学和应用科学分支,其中包括生物学,皮肤学、组织学、生理学、微生物学和老年医学。同样,它的工业技术发展也汲取于其它工业,特别是医药工业和食品工业。本文将重点介绍一些有关原料和成品加工的新技术,以及所用原料的最新发展。此外,还涉及到一些用来评价和保证化妆品安全和质量的最新测试技术。Walter P.Smith 王凯丰 1991日用化学工业译丛1991,,3:0
20使用预测性维修技术节约能源显示文摘对标准预测性维修(PdM)技术进行集成之后可以节约大量能源并能简化投资回报率的计算,附带还可以提高设施的可靠性、安全性并增强设施的能力和产量。作为预测性维修系统的一部分,对整个设施进行能量测量可以节省时间、金钱和能源。Dale P.Smith 鸿文(译) 2011设备管理与维修2011,,7:0
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