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Comparison of Water Resource Management Programs: An Algae Action Threshold Level Approach

Open Journal of Applied Sciences 2017年第2期7卷 31-41页

作者： West M. Bishop Ben E. willis SePRO Research and Technology Campus 16013 Watson Seed Farm Rd. Whitakers NC USA Department of Crop and Soil Sciences North Carolina State University Raleigh NC USA

Water resource management programs designed to control nuisance algal infestations have historically been dominated by reactive approaches. With increased regulatory scrutiny regarding algaecide use, data regarding efficacy of integrated management approaches are needed. This research outlines an efficient method of comparing management programs based upon exceeding designated algae action threshold levels (AATL) in pond systems. Phosphorus mitigating technologies were specifically evaluated as phosphorus had been indicated in supporting many nuisance algal types/densities. The objectives of this research were to evaluate pond management programs in terms of action thresholds exceeded, number of reactive algaecide treatments and algaecide amount required to maintain ponds below AATL. This research compared management programs consisting of: 1) Copper sulfate;2) SeClear Algaecide and Water Quality Enhancer;and 3) Phoslock phosphorus binding technology plus SeClear (as needed). Water and algae samples were analyzed every two weeks over two growing seasons on replicated research ponds and compared with designated AATL parameters. If an AATL was exceeded, then a reactive algaecide treatment was implemented for the corresponding water body. Ponds managed by copper sulfate alone exceeded a greater amount of AATL and required a significantly greater (P < 0.05) amount of reactive algaecide treatments to maintain control (average 6.5 annually) whereas SeClear and Phoslock plus ponds required 4.3 and 1.8 treatments, respectively. The average amount of copper applied to maintain ponds below AATL was 1414 g with copper sulfate whereas copper amendments were significantly decreased with SeClear (830 g) and even further with Phoslock plus management programs (342 g). Additionally, management programs incorporating nutrient mitigation required fewer treatments and less copper in year two of the program. This research provides valuable information for water resource managers to eva

关键词： Water Resource Management Algal Bloom Action Threshold Phosphorus Copper

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The Economic Contribution of Natural Resources to a State Economy: A South Carolina Case Study

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Natural Resources 2017年第3期8卷 115-129页

作者： David B. willis Thomas J. Straka College of Agriculture Forestry and Life Sciences Clemson University Clemson SC USA

The structure of state or sub-state regional economies is heavily influenced by its natural resource endowment. Input-output analysis is often used to estimate the economic contribution of various sectors to a state’s economy. We apply input-output analysis to South Carolina’s economy to estimate the contribution of natural resource-based sectors to the overall economy. The natural resource-based sectors consist of six mutually exclusive sectors: fishing, hunting, and wildlife viewing;coastal tourism;commercial fisheries;boat industry;mining;and forestry. The total economic contribution of these six natural resource-based sectors is $33.4 billion, representing 8.3% of gross state product and 8.6% of all state employment.

关键词： Natural Resources South Carolina Input-Output Analysis Economic Contribution

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Integration of Ground Magnetics and Energy Dispersive X-Ray Fluorescence Spectroscopy in Ilmenite Prospection in Magaoni, Kenya

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Open Journal of Applied Sciences 2016年第2期6卷 79-88页

作者： George Oduor Otieno John Gitonga Githiri willis Jakanyango Ambusso Kenyatta University Nairobi Kenya Jomo-Kenyatta University of Agriculture Science and Technology Nairobi Kenya

The geology of Magaoni area is associated with the presence of heavy minerals [1]. Magaoni’s neighbours Maumba and Nguluku where ilmenite was discovered by Tiomin Resource Inc. in 1996, using drilling and chemical analysis [2]. Ilmenite mineral is known to be magnetically weak, but provides observable magnetic response [3]. In this study, ground magnetic survey method was carried out to map magnetic anomalies of established stations, associated with ilmenite bearing formations. The magnetic contour map plotted showed weak and shallow magnetic signatures spread throughout the study area. 2D Euler deconvolution solutions revealed presence of magnetised formations from near surface to a maximum depth of about 450 m at some points. The weak magnetic formations of near surface indicated presence of ilmenite. Energy dispersive X-ray spectroscopy was done on soil samples collected randomly from the study area to determine the percentage of iron and titanium oxides. The results showed elevated values of titanium dioxide, ranging from 1.5% to 13% which is way above the global average of about 0.7% [4]. The percentage of iron oxide was low, ranging from 1.5% to 4%, this being the reason for weak magnetisation of the study area.

关键词： Ilmenite Magnetic Survey Euler Deconvolution Spectroscopy

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Collins COBUILD Intermediate English Grammar 2

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2004年

作者： Dave willis John Sinclair

ISBN: (纸本)0007163479;9780007163472

This new edition of the Collins COBUILD Intermediate English Grammar provide learners of English from intermediate level upwards with a wealth of reference and practice material. Logically organized, and clearly laid-out in colour, the new edition of the Collins COBUILD Intermediate English Grammar offers detailed treatment of the important points of English grammar. Thousands of examples from the

关键词： English languageGrammar1950English languageGrammar1950Problems exercises etc.English languageTextbooks for foreign speakers.Anglais (Langue)Grammaireétude et enseignement.Anglais (Langue)GrammaireProblèmes et exercices.Anglais (Langue)étude et enseignement.

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土压平衡盾构机施工案例浅析(二)

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筑路机械与施工机械化 2011年第7期28卷 20-21页

作者： Desiree willis 林嘉雯

近年来,根据在中国各种各样地质条件的隧道建设工程中积累的经验,罗宾斯研发出从模板化的刀盘主驱动到大功率的螺旋输送机的新一代优化土压平衡盾构机。从在层状地质中成功贯通隧道的广州地铁项目,到在渗透冲积状地质中创下新掘进速度... 详细信息

近年来,根据在中国各种各样地质条件的隧道建设工程中积累的经验,罗宾斯研发出从模板化的刀盘主驱动到大功率的螺旋输送机的新一代优化土压平衡盾构机。从在层状地质中成功贯通隧道的广州地铁项目,到在渗透冲积状地质中创下新掘进速度纪录的成都地铁项目,负责2009年广州地铁广佛线施工项目的罗宾斯现场服务肖权经理说:"我们已经顺利地攻破了许多困难,包括渗透性地质、粘土,还有地表的敏感建筑物和研究基地。"广州地铁项目驱使着罗宾斯开始为不同项目的盾构机进行一系列的改良。正因为如此,罗宾斯的盾构机可以屡次在不同项目中创下破纪录的佳绩。

关键词：土压平衡盾构机施工案例地质条件广州地铁螺旋输送机建设工程掘进速度现场服务

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土压平衡盾构机施工案例浅析(一)

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筑路机械与施工机械化 2011年第6期28卷 12-13页

作者： Desiree willis 林嘉雯

近年来,根据在中国各种各样地质条件的隧道建设工程积累的经验,罗宾斯研发出从模板化的刀盘主驱动到大功率的螺旋输送机的新一代优化土压平衡盾构机。从在层状地质中成功贯通隧道的广州地铁项目,到在渗透冲积状地质中创下新掘进速度纪... 详细信息

近年来,根据在中国各种各样地质条件的隧道建设工程积累的经验,罗宾斯研发出从模板化的刀盘主驱动到大功率的螺旋输送机的新一代优化土压平衡盾构机。从在层状地质中成功贯通隧道的广州地铁项目,到在渗透冲积状地质中创下新掘进速度纪录的成都地铁项目,负责2009年广州地铁广佛线施工项目的罗宾斯现场服务肖权经理说：＂我们已经顺利地攻破了许多的困难,包括渗透性地质、粘土,还有地表的敏感建筑物和研究基地。＂广州地铁项目驱使罗宾斯开始为不同项目的盾构机进行一系列改良。正因为如此,罗宾斯的盾构机可以屡次在不同项目中创下破纪录的佳绩。

关键词：土压平衡盾构机施工案例地质条件广州地铁螺旋输送机建设工程掘进速度现场服务

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Radiometric and Geophysical Investigations on Exposure Levels and Excess Cancer Risk in Kargi-Kenya

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Journal of Geoscience and Environment Protection 2023年第4期11卷 37-51页

作者： willis O. Aguko Robert Kinyua John G. Githiri Physics Department School of Physical Sciences College of Pure & Applied Sciences Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya

Radiation is considered one of the possible causes of cancer disease with natural background sources including cosmic, terrestrial and internal radiation. A number of cancer disease cases have been reported in Kargi with their causes not properly documented. The present work characterized the radioactivity in soil and water, to find out possible causes of radiation in KARGI-KENYA by studying magnetic intensities, anomalous zones with depth to magnetic sources and delineating subsurface structures. A total of 117 soil and 14 water samples were collected from the entire area and analysed for radionuclides due to 40K, 232Th and 226Ra. Measurement methods of proton magnetometer and gamma spectrometry employing a high purity germanium (HPGe) detector were employed basically to evaluate the magnetic survey and radiological hazard of radioactivities respectively. A total of 51 magnetic field measurements were taken on the eastern part of Kargi, a place suspected to have more concentration of radionuclides. The results showed that there could have been a fractionation during weathering period or metasomatic activity of the radioelements involvement. This study also reveals that the mining activities in the nearby study area could have affected the geologic formation causing more fracturing in rocks and pronounced subsurface structures as a result of mining that could have served as passage for leachates from pollutants as well as the level of radiation in the study area.

关键词： Kargi Magnetic Survey Anomalous zones Geologic Germanium Detector

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Hesitant adopters:COVID-19 vaccine hesitancy among diverse vaccinated adults in the United States

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Infectious Medicine 2023年第2期2卷 89-95页

作者： Sharon Reece Sheena CarlLee Aaron J.Scott Don E.willis Brett Rowland Kristin Larsen Ijanae Holman-Allgood Pearl A.McElfish College of Medicine University of Arkansas for Medical Sciences NorthwestFayettevilleAR 72703USA Office of Community Health and Research University of Arkansas for Medical Sciences NorthwestSpringdaleAR 72703USA College of Medicine University of Arkansas for Medical Sciences NorthwestSpringdaleAR 72703USA

Background:Despite the United States(US)having an abundant supply of COVID-19 vaccines,vaccination rates lag behind other high-income countries,suggesting that vaccine hesitancy and attitudes play a greater role in public health measures than pure supply and *** the acknowledgment that vaccination attitudes and status may or may not be correlated,this study examined COVID-19 vaccine hesitancy among vaccinated US adults by asking:(1)What is the prevalence of COVID-19 vaccine hesitancy among the vaccinated?(2)Does COVID-19 vaccine hesitancy vary across sociodemographic characteristics?(3)Does COVID-19 vaccine hesitancy vary by healthcare access and influenza vaccination over the past 5 years?Methods:Data were collected through an online survey of 2022 US adults with a final analytic sample of 1383 vaccinated ***:Overall,48.8%of vaccinated adults reported some level of hesitancy,while a slight majority reported they were“not at all hesitant”.Younger respondents,women,and Black and American Indian or Alaska Native participants had greater adjusted odds of being more hesitant towards receiving the COVID-19 ***-dents who had a primary care physician had greater adjusted odds than those who did not have a primary care physician of being more hesitant towards receiving the COVID-19 ***:This is the first population-based national sample study examining COVID-19 vaccine hesitancy among vaccinated individuals from subgroups of distinctive backgrounds in order to inform targeted strategies for reducing vaccine *** can assist in efforts to increase vaccination rates and also decrease vaccine hesitancy at the national level.

关键词： COVID-19 vaccine Vaccine hesitancy Hesitant adopters US adults

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The basics of project evaluation and lessons learned

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2012年

作者： willis H. Thomas.

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水轮机运行经历的重大问题(美国陆军工程师团的经验)

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人民长江 1992年第3期23卷 49-50页

作者： G.Paul willis 吴鸿寿

美国陆军工程师团经管运行的有344台水轮机,有些水轮机运行已超过50年。某些机组曾经历过重大的运行问题。为获得满意的解决,在工程师团成员、设计者、制造者和运行人员之间的有效合作是必需的。美国陆军工程师团已建成的水力发电设施... 详细信息

美国陆军工程师团经管运行的有344台水轮机,有些水轮机运行已超过50年。某些机组曾经历过重大的运行问题。为获得满意的解决,在工程师团成员、设计者、制造者和运行人员之间的有效合作是必需的。美国陆军工程师团已建成的水力发电设施遍布全美国,现在仍有70％在运行。其规模可从弗吉尼亚州罗诺克河上的14MW费尔波特水电站起。

关键词：轴流式水轮机运行水轮机混流式

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