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Spatial distribution of δ2H and δ18O values in the hydrologic cycle of the Nile Basin

Journal of Arid Land 2015年第2期7卷 133-145页

作者： Jeff B langman School of Science and Engineering American University in Cairo Department of Geological Sciences University of Idaho

Existing δ2H and δ18O values for precipitation and surface water in the Nile Basin were used to analyze precipitation inputs and the influence of evaporation on the isotopic signal of the Nile River and its tributaries. The goal of the data analysis was to better understand basin processes that influence seasonal streamflow for the source waters of the Nile River, because climate and hydrologic models have continued to produce high uncertainty in the prediction of precipitation and streamflow in the Nile Basin. An evaluation of differences in precipitation δ2H and δ18O values through linear regression and distribution analysis indicate variation by region and season in the isotopic signal of precipitation across the Nile Basin. The White Nile Basin receives precipitation with a more depleted isotopic signal compared to the Blue Nile Basin. The hot temperatures of the Sahelian spring produce a greater evaporation signal in the precipitation isotope distribution compared to precipitation in the Sahara/Mediterranean region, which can be influenced by storms moving in from the Mediterranean Sea. The larger evaporative effect is reversed for the two regions in summer because of the cooling of the Sahel from inflow of Indian Ocean monsoon moisture that predominantly influences the climate of the Blue Nile Basin. The regional precipitation isotopic signals convey to each region＇s streamflow, which is further modified by additional evaporation according to the local climate. Isotope ratios for White Nile streamflow are significantly altered by evaporation in the Sudd, but this isotopic signal is minimized for streamflow in the Nile River during the winter, spring and summer seasons because of the flow dominance of the Blue Nile. During fall, the contribution from the White Nile may exceed that of the Blue Nile, and the heavier isotopic signal of the White Nile becomes apparent. The variation in climatic conditions of the Nile River Basin provides a means of identifying mech

关键词： Nile River arid environment deuterium excess regional climate model uncertainty evaporation isotope effects

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God, guns, gold and glory: American character and its discontents

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作者： (1940-)langman Lauren (1964-)Lundskow George N.

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Stabilizing Pickering Emulsions Using Octenyl Succinic Anhydride Modified with Cellulose Nanofibrils

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Paper And Biomaterials 2022年第3期7卷 7-18页

作者： Jialei Qu langman Luo Weifeng Zhang Shao Geng Chunping Wang An Wang Yangbing Wen Tianjin Key Laboratory of Pulp and Paper Tianjin University of Science&TechnologyTianjin300457China

In this study,(2,2,6,6-tetramethylpiperidin-1-yl)oxyl-mediated(TEMPO-mediated)oxidized cellulose nanofibrils(TOCNFs)modified with octenyl succinic anhydride(OSA)to improve their hydrophobicity and emulsification performance were *** loadings of 9.87-14.81 mmol/g(base on oven-dry weight of TOCNFs)were explored during modification,and the obtained OSA-modified TOCNFs(TOCNF-OSA)were characterized using Fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy,X-ray diffraction,and thermogravimetric ***,the emulsification performance of TOCNF-OSA was also investigated in the preparation of the Pickering *** results demonstrated that the molecular chain of OSA was successfully grafted onto the backbone of TOCNFs during *** an increase in OSA loading,the content of the carboxyl group of the modified TOCNF-OSA increased significantly while the Zeta potential ***,a degree of substitution of 0.95 could be achieved at an OSA loading of 14.81 mmol/*** the preparation of Pickering emulsions,compared with original TOCNFs,the modified TOCNF-OSA significantly improved the stability and dispersibility of the Pickering *** study demonstrated a promising approach for the modification of the Pickering emulsion to produce an eco-friendly emulsifier with superior performance for use in the food industry.

关键词： modification TOCNF OSA hydrophobicity emulsification

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非类固醇抗炎药物性胃十二指肠病变的流行病学、病因和治疗

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国外医学（消化系疾病分册） 1991年第1期11卷 13-15页

作者： langman MJS 王吉耀

非类固醇抗炎药(NSAID)的应用可引起胃溃疡、胃十二指肠溃疡的并发症和死亡,这已是无可辩驳的事实。已有的报道提示,引起胃溃疡的相对危险性(relative risk,RR)为4.7～5.0。十二指肠溃疡的RR是1.1,上消化道出血由于胃和十二指肠溃疡所致... 详细信息

非类固醇抗炎药(NSAID)的应用可引起胃溃疡、胃十二指肠溃疡的并发症和死亡,这已是无可辩驳的事实。已有的报道提示,引起胃溃疡的相对危险性(relative risk,RR)为4.7～5.0。十二指肠溃疡的RR是1.1,上消化道出血由于胃和十二指肠溃疡所致的RR分别为2.8和2.7,胃溃疡所致死亡的危险性为4.2,十二指肠溃疡为7.9。死亡并非由于溃疡本身,而是由于溃疡所致的并发症。迄今为止,能够预测发生病变的危险因素还很局限。流行病学和发病原因发病类型药物使用指南一般建议以往有溃疡病史及消化不良者应避免使用NSAIDs,但此种建议是否确有依据尚属可疑。

关键词：抗炎药胃溃疡流行病学病因

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非类固醇抗炎药诱发的胃十二指肠病的处理、流行病学、病因和治疗第九届世界胃肠病学悉尼会议资料之二

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国外医学（内科学分册） 1991年第7期18卷 293-294,301页

作者： langman MJS 冯鉴强

非类固醇抗炎药已被证明与胃溃疡、消化性溃疡的并发症和死亡有关。本文就流行病学、病因和治疗等方面的问题作了讨论。

关键词：胃溃疡十二指溃疡病因

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未来的医院未来医院工作人员的供求

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英国医学杂志中文版 2002年第4期5卷 214-216页

作者： Robin Dowie Michael langman 刘智李佳

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医用胚胎学人体的正常和异常发育

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1981年

作者：（美）兰曼（J.langman）杜炎青译

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医用胚胎学

医用胚胎学

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作者： J.·兰曼(J. langman)

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Noninvasive Low-Intensity Focused Ultrasound Mediates Tissue Protection following Ischemic Stroke

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Biomedical Engineering Frontiers 2022年第1期3卷 356-366页

作者： Alexandra M.Kaloss Lauren N.Arnold Eman Soliman Maya langman Nathalie Groot Eli Vlaisavljevich Michelle H.Theus Department of Biomedical Sciences and Pathobiology Virginia TechBlacksburgVA 24061USA Department of Biomedical Engineering and Mechanics Virginia TechBlacksburg VA 24061USA Center for Engineered Health Virginia TechBlacksburg Virginia 24061USA

Objective and Impact *** study examined the efficacy and safety of pulsed,low-intensity focused ultrasound(LIFU)and determined its ability to provide neuroprotection in a murine permanent middle cerebral artery occlusion(pMCAO)*** ultrasound(FUS)has emerged as a new therapeutic strategy for the treatment of ischemic stroke;however,its nonthrombolytic properties remain ***,we examined how LIFU influenced neuroprotection and vascular changes following *** to the critical role of leptomeningeal anastomoses or pial collateral vessels,in cerebral blood flow restoration and tissue protection following ischemic stroke,we also investigated their growth and *** were exposed to transcranial LIFU(fundamental frequency:1.1 MHz,sonication duration:300 ms,interstimulus interval:3 s,pulse repetition frequency:1 kHz,duty cycle per pulse:50%,and peak negative pressure:-2.0 MPa)for 30 minutes following induction of pMCAO and then evaluated for infarct volume,blood-brain barrier(BBB)disruption,and pial collateral remodeling at 24 hrs *** found significant neuroprotection in mice exposed to LIFU compared to mock *** findings correlated with a reduced area of IgG deposition in the cerebral cortex,suggesting attenuation of BBB breakdown under LIFU *** also observed increased diameter of CD31-postive microvessels in the ischemic *** observed no significant difference in pial collateral vessel size between FUS and mock treatment at 24 hrs *** data suggests that therapeutic use of LIFU may induce protection through microvascular remodeling that is not related to its thrombolytic activity.

关键词： Focus repetition treatment

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有机高分子絮凝剂(AM-DMC-DMAAC-18)的合成与性能研究

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鞋类工艺与设计 2022年第13期2卷 168-170页

作者：邢浪漫文成新四川文理学院四川达州635000 西南石油大学四川成都620001

絮凝沉淀法是污水处理中一种广泛有效的方法。本文以丙烯酰胺(AM)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)和十八烷基二甲基烯丙基氯化铵(DMAAC-18)为单体,合成三元共聚絮凝剂(AM-DMC-DMAAC-18),并通过红外谱进行探究,分别研究了絮凝剂加... 详细信息

絮凝沉淀法是污水处理中一种广泛有效的方法。本文以丙烯酰胺(AM)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)和十八烷基二甲基烯丙基氯化铵(DMAAC-18)为单体,合成三元共聚絮凝剂(AM-DMC-DMAAC-18),并通过红外谱进行探究,分别研究了絮凝剂加量、高岭土悬浮液pH、Na+浓度等因素对该絮凝剂絮凝性能的影响。

关键词：絮凝剂絮凝性能有机高分子

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