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Agricultural Sciences 2021年第3期12卷 159-180页

作者： Reginald S. Fletcher Daniel K. fisher United States Department of Agriculture Agricultural Research Service Crop Production Systems Research Unit Stoneville USA Sustainable Water Management Research Unit Stoneville USA

A research project was undertaken to collect data to study the variability in environmental parameters inside a greenhouse. The specific objectives of the project were to 1) develop the network of open-source sensor nodes, 2) evaluate the performance of the individual sensors, and 3) quantify the spatial variability of environmental parameters within the greenhouse. The sensor system consisted of a sensor node equipped with three temperature and relative humidity sensors, one light-level sensor, one barometric pressure sensor, AA batteries, and a microcontroller board with a built-in radio to transfer the data wirelessly. The sensors were controlled with open-source technology. Twelve sensor nodes were fabricated and placed at different locations in a greenhouse to evaluate variability in sensor location and environmental parameters. Data collected during February 2019 were used to test the sensors. Heatmaps were employed to assess the variability of the measurements. Variability in greenhouse temperature, relative humidity, and light level conditions was identified with the sensor system. Overall, environmental measures based on time of day appeared to be a better grouping mechanism for analysis than sensor location in the greenhouse. Similar patterns were observed between the different sensor manufacturer’s heatmaps for the temperature sensors and relative humidity sensors. This study provided a protocol for developing the inexpensive multi-sensor sensor node and showed that automated measurements obtained with the system could help monitor variation in a greenhouse setting. The costs of the system components fabricated for this study included US$76 for each sensor node and US$55 for the gateway, totaling US$967 for the 12-node study described.

关键词： Arduino Microcontroller LoRa Radio Temperature Humidity Light Level Clustering Heatmaps

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若干个变量的分布积(英文)

江苏农学院学报 1990年第4期11卷 1-10页

作者： Brian fisher 李程宽英国累斯特大学江苏农学院基础课部

设ρ(x)是定义在[1]中的无穷可微函数,δ_n(x)定义为δ_n(x)=n^me(nx_1)…e(nx_m),x∈R^m。两个分布f和g的乘积定义为序列{fg_n}的中性极限。其中g_n=g*δ_n运用定义,给出了一些乘积结果。

关键词：多变量分布积中性极限 δ-分布

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厨房与浴室设计

作者： (美)Mary fisher Knott

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Living religions

北京市通州区和顺义区747例2型糖尿病患者生存质量影响因素

2005年

作者： Mary Pat fisher

来源：畅想之星图书光盘版（南... 评论

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北京大学学报（医学版） 2021年第3期53卷 523-529页

作者：樊理诗高敏 EdwinB.fisher 孙昕霙北京大学公共卫生学院社会医学与健康教育系北京100191 Department of Health Behavior Gillings School of Global Public Health University of North Carolina-Chapel Hill North Carolina 27599-7440 USA

目的:探讨北京市通州区和顺义区747例2型糖尿病患者的生存质量现状及影响因素。方法:对纳入研究的747例2型糖尿病患者进行问卷调查和抽血实验室血生化检查。以糖化血红蛋白(hemoglobin A1c,HbA1c)作为血糖控制指标,以糖尿病患者特异性... 详细信息

目的:探讨北京市通州区和顺义区747例2型糖尿病患者的生存质量现状及影响因素。方法:对纳入研究的747例2型糖尿病患者进行问卷调查和抽血实验室血生化检查。以糖化血红蛋白(hemoglobin A1c,HbA1c)作为血糖控制指标,以糖尿病患者特异性生存质量量表(diabetes specific quality of life scale,DSQL)评分为患者生存质量指标,采用多元线性回归和结构方程模型(structural equation modeling,SEM)分析生存质量的影响因素。结果:调查747例患者,HbA1c平均水平(7.1±1.2)%,血糖控制达标率为35.1%(262/747)。血糖控制好和血糖控制差两组患者的病程、服药和使用胰岛素、吸烟情况及体重指数(body mass index,BMI)差异有统计学意义(P<0.05)。DSQL总分为(44.92±13.32)分,生理维度条目平均分最高,其次是心理维度。多元线性回归结果显示,家庭月收入、并发症、抑郁、病程时间、胰岛素、住院及自我效能是DSQL总分的影响因素(P<0.05)。SEM结果显示,血糖对于生存质量的生理维度(标准化效应值为0.166)、心理维度(0.076)及社会维度(0.124)存在影响,抑郁对于生存质量的生理维度(0.342)、心理维度(0.217)及治疗维度(0.050)存在影响,差异有统计学意义(P<0.05)。结论:北京市通州区和顺义区2型糖尿病患者HbA1c控制水平欠佳,生存质量尚可,仍有非常大的提升空间。应提高对男性、病程长、处于不服药状态、不使用胰岛素、吸烟、处于抑郁状态、糖尿病技能得分水平低的患者的关注和管理,同时应在临床治疗中提高对患者心理需求的重视,加强对患者及其家属的心理健康教育,采取相应的心理干预措施,以达到有效控制血糖的目的,从而提高患者的生活质量。

关键词：糖尿病,2型生活质量血红蛋白A,糖基化抑郁

Reservoir stress path and induced seismic anisotropy： results from linking coupled fluid-flow/geomechanical simulation with seismic modelling

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Petroleum Science 2016年第4期13卷 669-684页

作者： D.A.Angus Q.J.fisher J.M.Segura J.P.Verdon J.-M.Kendall M.Dutko A.J.L.Crook School of Earth and Environment University of LeedsLeeds UK Formerly School of Earth and Environment University of Leeds Leeds UK Department of Earth Sciences University of Bristol BristolUK Rockfield Software Ltd. Swansea UK Three Cliffs Geomechanics Swansea UK Repsol Madrid Spain ESG Solutions Kingston Canada

We present a workflow linking coupled fluid-flow and geomechanical simulation with seismic modelling to predict seismic anisotropy induced by non-hydrostatic stress changes. We generate seismic models from coupled simulations to examine the relationship between reservoir geometry, stress path and seismic anisotropy. The results indicate that geometry influences the evolution of stress,which leads to stress-induced seismic anisotropy. Although stress anisotropy is high for the small reservoir, the effect of stress arching and the ability of the side-burden to support the excess load limit the overall change in effective stress and hence seismic anisotropy. For the extensive reservoir, stress anisotropy and induced seismic anisotropy are high. The extensive and elongate reservoirs experience significant compaction, where the inefficiency of the developed stress arching in the side-burden cannot support the excess *** elongate reservoir displays significant stress asymmetry,with seismic anisotropy developing predominantly along the long-edge of the reservoir. We show that the link betweenstress path parameters and seismic anisotropy is complex,where the anisotropic symmetry is controlled not only by model geometry but also the nonlinear rock physics model used. Nevertheless, a workflow has been developed to model seismic anisotropy induced by non-hydrostatic stress changes, allowing field observations of anisotropy to be linked with geomechanical models.

关键词： Coupled fluid-flow/geomechanics Reservoir characterization Seismic anisotropy Stress path

Entomopathogenic fungi isolated from Yukon soil against unfed larvae of the winter tick,Dermacentor albipictus

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Studies in Fungi 2019年第1期4卷 123-134页

作者： Dobrotka CJ Krieger M Oakley M Trotter J Rodell BM Stein KL Klever LA fisher KA Yoder JA Department of Biology Wittenberg UniversitySpringfieldOH45501USA Champagne and Aishihik First Nations Haines JunctionYTY0B 1L0CAN Oakley Veterinary Services HainesAK99827USA

Fungal composition of Yukon soil samples consisted of 29 soil saprobes common to acidified forest,subarctic *** of the fungi identified are psychrotrophs,capable of growth at both 4℃ and 20℃.Of these,a total of 17 fungi were found to be entomopathogenic by winter tick(Dermacentor albipictus)larval bioassays:Aspergillus flavus,Beauveria,namely ***,Mucor,Paecilomyces yielded>~70%larval mortality and the remainder,mostly Mortierella and Penicillium,averaged~40%larval *** where elk(Cervus elaphus canadensis)are observed had an overall greater quantity,and diversity of entomopathogenic soil fungi than sites where elk are not *** diversity of fungi at elk-inhabited sites is likely a product of warmer soil microclimate(hillsides where elk are seen,lose snow earlier than other areas),animal presence,and increased nutrient *** conclude that Yukon soils contain fungi that naturally regulate populations of *** fungi are archived at the Wittenberg University Fungus Collection,Springfield,OH,USA.

关键词： Biological control mycoflora moose tick elk tick horse tick Canada Alaska

An AMR Capable Finite Element Diffusion Solver for ALE Hydrocodes

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Plasma Science and Technology 2015年第2期17卷 109-116页

作者： A.C.fisher D.S.BAILEY T.B.KAISER D.C.EDER B.T.N.GUNNEY N.D.MASTERS A.E.KONIGES R.W.ANDERSON Lawrence Livermore National Laboratory Lawrence Berkeley National Laboratory

We present a novel method for the solution of the diffusion equation on a composite AMR mesh. This approach is suitable for including diffusion based physics modules to hydrocodes that support ALE and AMR capabilities. To illustrate, we proffer our implementations of diffu- sion based radiation transport and heat conduction in a hydrocode called ALE-AMR. Numerical experiments conducted with the diffusion solver and associated physics packages yield 2nd order convergence in the L2 norm.

关键词： hydrodynamic simulation heat conduction thermal radiation adaptive meshrefinement finite element method

Open-Source Hardware Is a Low-Cost Alternative for Scientific Instrumentation and Research

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Modern Instrumentation 2012年第2期1卷 8-20页

作者： Daniel K. fisher Peter J. Gould US Forest Service Pacific Northwest Research Station Olympia USA USDA Agricultural Research Service Stoneville USA

Scientific research requires the collection of data in order to study, monitor, analyze, describe, or understand a particular process or event. Data collection efforts are often a compromise: manual measurements can be time-consuming and labor-intensive, resulting in data being collected at a low frequency, while automating the data-collection process can reduce labor requirements and increase the frequency of measurements, but at the cost of added expense of electronic data-collecting instrumentation. Rapid advances in electronic technologies have resulted in a variety of new and inexpensive sensing, monitoring, and control capabilities which offer opportunities for implementation in agricultural and natural-resource research applications. An Open Source Hardware project called Arduino consists of a programmable microcontroller development platform, expansion capability through add-on boards, and a programming development environment for creating custom microcontroller software. All circuit-board and electronic component specifications, as well as the programming software, are open-source and freely available for anyone to use or modify. Inexpensive sensors and the Arduino development platform were used to develop several inexpensive, automated sensing and datalogging systems for use in agricultural and natural-resources related research projects. Systems were developed and implemented to monitor soil-moisture status of field crops for irrigation scheduling and crop-water use studies, to measure daily evaporation-pan water levels for quantifying evaporative demand, and to monitor environmental parameters under forested conditions. These studies demonstrate the usefulness of automated measurements, and offer guidance for other researchers in developing inexpensive sensing and monitoring systems to further their research.

关键词： Open-Source Hardware Arduino Microcontrollers Sensors Datalogger