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Impact of Annual Ryegrass on Nitrate-N Losses during One Growing Season of Maize in the Midwestern United States <br/>—An On-Farm case Study

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Journal of Water Resource and Protection 2019年第5期11卷 606-625页

作者： Jude A. Holscher Paul c. davidson Department of Agricultural and Biological Engineering University of Illinois Urbana-Champaign Urbana IL USA

Winter cover crops have been shown to reduce nitrate-N (NO3-N) losses in runoff water and are recommended by the Illinois Nutrient Loss Reduction Strategy (NLRS) for reducing nutrient losses from agricultural fields. With an estimated 80 percent of the NO3-N load in Illinois coming from agriculture, the NLRS stresses the importance of farmers’ voluntary implementation of best management strategies in order to reach these goals. This study compares the difference in NO3-N losses from tile drainage water from an annual ryegrass (AR, Lolium multiflorum) winter cover-cropped treatment to a conventional tillage (cT) control (fall chisel and spring field cultivation). Throughout the maize (Zea mays L.) growing season, tile drainage water was collected and analyzed for NO3-N concentrations. Despite the AR treatment having a 29% lower mean daily NO3-N concentration, there was no significant difference in total daily NO3-N flux between AR and cT for this study period of April-July 2015. The cumulative losses of NO3-N were calculated at 11.65 and 10.56 kg ha?1 NO3-N for the cT and AR treatment, respectively, or a 9.4% reduction in the AR treatment during the period of study. When the season was divided based on growing season periods, the NO3-N flux values were less for the cover crop while the AR was actively growing, greater for the cover crop for the period following annual ryegrass termination through maximum crop canopy, and lower for the cover crop in the late stages of vegetative growth through relative maturity.

关键词： cover crop Annual Ryegrass Nitrate-N Nutrient Best Management Practice Gulf of Mexico Hypoxia

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Investigation of Rotavirus Survival in Different Soil Fractions and Temperature conditions

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Journal of Environmental Protection 2013年第7期4卷 1-9页

作者： Paul c. davidson Theresa B. Kuhlenschmidt Rabin Bhattarai Prasanta K. Kalita Mark S. Kuhlenschmidt Department of Agricultural and Biological Engineering University of Illinois Urbana USA. Department of Pathobiology University of Illinois Urbana USA Waterborne Environmental Inc. Champaign USA

Rotavirus is a leading cause of gastrointestinal illness worldwide. Rotavirus transmission occurs fecalorally, and becomes a critical water quality issue when soil and water resources are contaminated with feces. Transport of pathogens to surface water sources depends on their survival in the soil, especially considering the fact that large amounts of fecal material are often applied to agricultural lands as fertilizer. In this study, rotavirus survival was investigated in three different soil fractions and at three different temperatures (4℃, 25℃ and 37℃). A rotavirus suspension was mixed with whole soil, sand, and clay and allowed to incubate for up to 18 days. Samples were collected daily to investigate virus survival over time, which was quantified using a tissue-culture infectivity assay. Results indicated, in the absence of any soil particles, rotavirus survival was highest at 4℃, with survival decreasing as temperature increased. These data also indicated whole soil had some protective effect, allowing rotavirus to survive better in soil for the entire range of temperatures and for more than a week at 37℃. The results also showed that sand fractions were the most effective media for reducing rotavirus recovery at all temperature conditions tested. Although the mechanism responsible for the low recovery from sand is unknown, there is little or no infective rotavirus extracted from sand fractions. This finding strongly supports the use of sand as a filtering material to remove rotavirus from both point and nonpoint sources of water pollution.

关键词： Water Quality Pathogens Public Health Fate and Transport

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MAGNESIODUMORTIERITE:A NEW MINERAL FROM DORA-MAIRA MASSIF（ITALY）,ITS cRYSTAL STRUcTURE AND VERY-HIGH-PRESSURE METAMORPHISM

MAGNESIODUMORTIERITE:A NEW MINERAL FROM DORA-MAIRA MASSIF（I...

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Sixteenth congress of the International Union of crystallography

作者： G.Ferraris G.Ivaldi c.chopin R.compagnoni c.davidson A.Davis Dip.Sci.Mineral.Petrol. Univ.TorinoItaly Lab.Geol. Ecole normale superieureParisFrance Geol.Inst.Univ.Basel Switzerland The Enrico Fermi Inst. Univ.ChicagoU.S.A.

＜正＞Magnesiodumortierite is the magnesium analogue of dumortierite with an octahedral site（out of 4 independent ones） which is Al-free and is occupied by Mg as the most abundant *** occurs as rare inclusion within pyropes of coesite-bearing whiteschists （Dora-Maira Massif,western Alps,Italy）. Pink to red;biaxial（-）,α= 1.678,β=1.700,γ=

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钾平衡和利尿剂

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国外医学(老年医学分册) 1983年第2期 76-79页

作者： davidson c Morgan D B 董长城

虽然口服利尿剂已用多年,然关于低钾血症发生率的报告甚少。从得到的资料来看,学者们指出老年人低钾血症的危险性和治疗的必要性常被夸大。低钾血症的产生,多半与利尿剂有关,而与年龄的易感性无关。

关键词：利尿剂老年人发生率低钾血症水-电解质代谢紊乱补钾住院病人住院患者高血压病人

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Low-loss and polarization insensitive 32×4 optical switch for ROADM applications

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Light(Science & Applications) 2024年第5期13卷 875-884页

作者： Xiaotian Zhu Xiang Wang Yanlu Huang Liyan Wu chunfei Zhao Mingzhu Xiao Luyi Wang Roy davidson Yanni Ou Brent E.Little Sai T.chu Department of Physics City University of Hong KongTat Chee AvenueHong KongChina. QXP Technologies Inc. NO.15th Shanglinyuan 1st RoadXi’anShaanxi 710119China. State Key Laboratory of Information of Photonics and Optical communications School of Electronic EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China

Integrated switches play a crucial role in the development of reconfigurable optical add-drop multiplexers(ROADMs)that have greater flexibility and compactness,ultimately leading to robust single-chip *** decades of research on switches with various structures and platforms,achieving a balance between dense integration,low insertion loss(IL),and polarization-dependent loss(PDL)remains a significant *** this paper,we propose and demonstrate a 32×4 optical switch using high-index doped silica glass(HDSG)for ROADM *** switch is designed to route any of the 32 inputs to the express ports or drop any channels from 32 inputs to the target 4 drop ports or add any of the 4 ports to any of the 32 express *** switch comprises 188 MachZehnder Interferometer(MZI)type switch elements,88 optical vias for the 44 optical bridges,and 618 waveguidewaveguide crossings with three-dimensional(3D)*** 1550 nm,the fiber-to-fiber loss for each express channel is below 2 dB,and across the c and L bands,below 3 *** each input channel to all 4 drop/add channels at 1550 nm,the loss is less than 3.5 dB and less than 5 dB across the c and L *** PDLs for all express and input channels to the 4 drop/add channels are below 0.3 dB over the c band,and the crosstalk is under−50 dB for both the c and L bands.

关键词： polarization ROADM optical

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Are there sex-based disparities in cataract surgery?

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International Journal of Ophthalmology(English edition) 2024年第1期17卷 137-143页

作者： Matthew D.Geiger Anne M.Lynch Alan G.Palestine Nathan c.Grove Karen L.christopher Richard S.davidson Michael J.Taravella Naresh Mandava Jennifer L.Patnaik Department of Ophthalmology University of Colorado School of MedicineAuroraCO 80045USA

AIM:To investigate sex-based differences in the occurrence of intra-operative and post-operative complications and associated visual outcomes following cataract ***:This was a retrospective study of patients who had phacoemulsification cataract surgery at the University of colorado School of *** collected included the patient’s health history,ocular comorbidities,operative and post-operative complications,and the post-operative best corrected visual acuity(BcVA).The data were analyzed using univariate and multivariable logistic regression with generalized estimating equations to account for the correlation of some patients having two eyes included in the ***:A total of 11977 eyes from 7253 patients were included in the *** comorbidities differed by sex,with males having significantly higher percentages of traumatic cataracts(males 0.7%vs females 0.1%),prior ocular surgery(6.7%vs 5.5%),and mature cataracts(2.8%vs 1.9%).conversely,females had significantly higher rates of pseudoexfoliation(2.0%vs 3.2%).In unadjusted analysis,males had higher rates of posterior capsular rupture(0.8%vs 0.4%)and vitreous loss(1.0%vs 0.6%),but this difference was not significant after adjustment for *** had a significantly increased risk of post-operative retinal detachment,but in multivariable analysis this was no longer *** were significantly less likely to undergo post-operative neodymium-doped yttrium aluminum garnet(Nd:YAG)laser capsulotomy for posterior capsule opacification(OR=0.8,95%cI=0.7-0.9,P=0.0005).The BcVA was slightly worse for males pre-operatively;but post-operatively,both sexes exhibited similar visual acuity of Snellen equivalent 20/***:The study finds that in a cohort of patients presenting for cataract surgery,sex differences exist in pre-operative comorbidities and surgical characteristics that contribute to higher rates of some complications for ***,observed surgical complicatio

关键词： cataract surgery sex-based disparity phacoemulsification outcomes

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SIMA法制备AZ91半固态坯料枝晶衍变规律的研究

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哈尔滨理工大学学报 2006年第2期11卷 39-42页

作者：宁志良 WANG H davidson c J 刘殿奎哈尔滨工程大学建筑工程学院 School of Engineering The University of Queensland

研究了应变诱发熔化激活法(SIMA)制备AZ91半固态坯料枝晶演变规律.挤压后,AZ91组织结构为白亮拉长的初生α相和分布在其间的黑色共晶相.由于变形不充分,在试棒中心垂直于挤压方向仍有较大的初生α相存在.575℃等温重熔过程中,首先发生... 详细信息

研究了应变诱发熔化激活法(SIMA)制备AZ91半固态坯料枝晶演变规律.挤压后,AZ91组织结构为白亮拉长的初生α相和分布在其间的黑色共晶相.由于变形不充分,在试棒中心垂直于挤压方向仍有较大的初生α相存在.575℃等温重熔过程中,首先发生再结晶,伴随液相向再结晶产生的晶界渗透,导致枝晶破碎.随着等温保温时间的增加,组织转变为细小的球状α相,均匀分布在液相中.等温保温10m in时,α相由于组织的球化和粗化过程而变得更为圆整粗大.

关键词： AZ91 SIMA 组织衍变

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与在适应证外和未经测试的情况下使用药物洗脱支架相关的预后及并发症

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世界核心医学期刊文摘(心脏病学分册) 2007年第9期 12-13页

作者： Beohar N. davidson c.J. Kip K.E. 罗亮 Department of cardiology Northwestern Memorial Hospital 251 E Huron St Feinberg 8-790A Chicago IL 60610 United States

背景:有关在已核准适应证以外情况下使用药物洗脱支架的资料有限。目的:观察在经皮冠状动脉介入(PcI)适应证外(再狭窄、血管桥病变、长病变、血管大小超过推荐使用范围)和未经测试(左主干、开口处、分叉处或完全闭塞病变)的情况下使用... 详细信息

背景:有关在已核准适应证以外情况下使用药物洗脱支架的资料有限。目的:观察在经皮冠状动脉介入(PcI)适应证外(再狭窄、血管桥病变、长病变、血管大小超过推荐使用范围)和未经测试(左主干、开口处、分叉处或完全闭塞病变)的情况下使用药物洗脱支架的频

关键词：药物洗脱支架患者血运重建靶血管使用者适应证 PcI 预后

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粉末冶金Al-5.6Zn-2Mg合金在热压缩过程中加工硬化特性及本构模型的比较

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Journal of central South University 2024年第2期31卷 346-368页

作者： KATIKA Harikrishna DAMODA R.K. davidson M.J. SEETHARAM R. KASAGANI Veera Venkata Nagaraju Department of Mechanical Engineering National Institute of TechnologyWarangal 506004India Department of Mechanical Engineering The Indian Institute of Information Technology Design and ManufacturingKurnool 518007India

在300~5000℃、应变速率为0.1~0.0001 s−1的条件下,在万能试验机上对Al-5.6Zn-2Mg铝合金进行热压缩试验,以确定动态再结晶开始时的加工硬化速率曲线σ_(c)(ε_(c))l以及关键特征σ_(c)(ε_(c))l、σ_(p)(ε_(p))和σ_(ss)与Z系数之间的... 详细信息

在300~5000℃、应变速率为0.1~0.0001 s−1的条件下,在万能试验机上对Al-5.6Zn-2Mg铝合金进行热压缩试验,以确定动态再结晶开始时的加工硬化速率曲线σ_(c)(ε_(c))l以及关键特征σ_(c)(ε_(c))l、σ_(p)(ε_(p))和σ_(ss)与Z系数之间的相关性。使用了四个本构模型,Arrhenius模型、改进的Johnson-cook模型(MJc)、改进的Zerilli-Armstrong模型(MZA)和开发的人工神经网络(ANN)。结果表明,ANN型模型和Arrhenius模型的相对误差的绝对平均值最低,分别为0.486%和3.36%,MZA型模型和MJc型模型的相对误差的绝对平均值较高,分别为8.84%和3.93%。由于Arrhenius模型能够处理各种因素之间的非线性关系,因此它被认为是最合适的预测模型,但在材料性质未知或实验数据有限的情况下,MJc模型可能是一种更简单的替代方法。MZA模型不适合估计热压缩时的流变应力。此外,训练最好的神经网络模型的预测性能最好,相对误差的绝对平均值为0.486%,R值为0.99。

关键词：加工硬化速率曲线本构建模热压缩 EBSD分析流变曲线

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胰岛素锌悬垂液引起严重皮肤反应

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中华皮肤科杂志 1958年第3期6卷 244-244页

作者： J.c.davidson

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