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Changes in Soil Physicochemical Properties under Selected Climate-Smart Agricultural Practices in Central African Republic

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Open Journal of Soil Science 2024年第1期14卷 97-114页

作者： Julie Léancy Gougodo De Mon-Zoni Arnauld dave Bangane Konzoba Jane Akoth Omenda Mohammad Zaman Ephrem Kosh-Komba Plant and Fungal Biodiversity Laboratory Faculty of Sciences University of Bangui Central African Republic Central African Institute for Agricultural Research (ICRA) Bangui Central African Republic Laboratoiry of Geoscience Faculty of Sciences University of Bangui Bangui Central African Republic Departement of Water & Agricultural Resources Management University of Embu Embu Kenya International Atomic Energy Agency (IAEA) Vienna Austria Laboratory of Biological and Agronomical Sciences for Development Faculty of Sciences University of Bangui Bangui Central African Republic

Soil nutrient depletion as a result of continuous cultivation with insufficient external nutrient replenishment is a major challenge in sub-Saharan Africa (SSA). A trial using the organic and mineral fertilizer was established in the cassava cropping system of the Pissa and Damara areas to address the declining soil fertility. The study aimed to evaluate the effect of cow manure and mineral fertilizer in combination or sole application on soil physico-chemical properties and macronutrients. The experimental trial adopted a randomized complete block design (RCBD) replicated four times. The treatments comprised of;T1 (Control), T2 (Peasant practice), T3 (sole NPK), and T4 (Cow manure + NPK). The data on soil physicochemical analysis was subjected to a one-way analysis of variance in SAS 9.4 and the mean was separated by Tukey’s HSD test at p < 0.005. The soil pH values ranged from 4.20 to 4.91;and 4.53 to 5.28 in Pissa and Damara respectively. According to the treatments, a low pH value is observed in T3 (4.13) in the Pissa. Combined use of cow manure and the mineral fertilizer resulted in higher Mg K and N in the Pissa region and higher soil pH in Damara. The use of sole NPK (T3) gave a higher soil carbon and CN ratio. In the Pissa region the CEC, Cu, Fe, and Zn were higher in the treatments with mineral fertilizer compared to the control. Conclusively, the use of mineral fertilizer and cow manure can be used with optimum rates to improve soil physico-chemical properties on a sustainable basis.

关键词： Cow Manure Physicochemical Nutrients Agroecology Nutrient Management

IQR-based approach for DDoS detection and mitigation in SDN

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Defence Technology（防务技术） 2023年第7期25卷 76-87页

作者： Rochak Swami Mayank dave Virender Ranga Department of Computer Engineering National Institute of TechnologyKurukshetraIndia Department of Information Technology Delhi Technological UniversityDelhiIndia

Software-defined networking(SDN) is a trending networking paradigm that focuses on decoupling of the control logic from the data plane. This decoupling brings programmability and flexibility for the network management by introducing centralized infrastructure. The complete control logic resides in the controller, and thus it becomes the intellectual and most important entity of the SDN infrastructure. With these advantages, SDN faces several security issues in various SDN layers that may prevent the growth and global adoption of this groundbreaking technology. Control plane exhaustion and switch buffer overflow are examples of such security issues. Distributed denial-of-service(DDoS) attacks are one of the most severe attacks that aim to exhaust the controller’s CPU to discontinue the whole functioning of the SDN network. Hence, it is necessary to design a quick as well as accurate detection scheme to detect the attack traffic at an early stage. In this paper, we present a defense solution to detect and mitigate spoofed flooding DDoS attacks. The proposed defense solution is implemented in the SDN controller. The detection method is based on the idea of an statistical measure — Interquartile Range(IQR). For the mitigation purpose, the existing SDN-in-built capabilities are utilized. In this work, the experiments are performed considering the spoofed SYN flooding attack. The proposed solution is evaluated using different performance parameters, i.e., detection time, detection accuracy, packet_in messages, and CPU utilization. The experimental results reveal that the proposed defense solution detects and mitigates the attack effectively in different attack scenarios.

关键词： SDN DdoS IQR Controller CPU utilization Packet_in

A history of high-power laser research and development in the United Kingdom

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High Power Laser Science and Engineering 2021年第2期9卷 41-126页

作者： Colin N.Danson Malcolm White John R.M.Barr Thomas Bett Peter Blyth David Bowley Ceri Brenner Robert J.Collins Neal Croxford A.E.Bucker Dangor Laurence Devereux Peter E.Dyer Anthony Dymoke-Bradshaw Christopher B.Edwards Paul Ewart Allister I.Ferguson John M.Girkin Denis R.Hall David C.Hanna Wayne Harris David I.Hillier Christopher J.Hooker Simon M.Hooker Nicholas Hopps Janet Hull David Hunt Dino A.Jaroszynski Mark Kempenaars Helmut Kessler Sir Peter L.Knight Steve Knight Adrian Knowles Ciaran L.S.Lewis Ken S.Lipton Abby Littlechild John Littlechild Peter Maggs Graeme P.A.Malcolm OBE Stuart P.D.Mangles William Martin Paul McKenna Richard O.Moore Clive Morrison Zulfikar Najmudin David Neely Geoff H.C.New Michael J.Norman Ted Paine Anthony W.Parker Rory R.Penman Geoff J.Pert Chris Pietraszewski Andrew Randewich Nadeem H.Rizvi Nigel Seddon MBE Zheng-Ming Sheng David Slater Roland A.Smith Christopher Spindloe Roy Taylor Gary Thomas John W.G.Tisch Justin S.Wark Colin Webb S.Mark Wiggins dave willford Trevor Winstone AWE Aldermaston ReadingUK Oxford Centre for High Energy Density Science Department of PhysicsClarendon LaboratoryUniversity of OxfordOxfordUK Centre for Intertial Fusion Studies Blackett LaboratoryImperial College LondonLondonUK Formerly of Electrox LetchworthUK Formerly of Central Laser Facility Rutherford LaboratoryDidcotUK Formerly of Ferranti Defence Systems LincolnUK Leonardo EdinburghUK Retired AWEReadingUK Formerly of AWE ReadingUK Formerly of Laser Lines Ltd BanburyUK Formerly of Optilas Ltd Milton KeynesUK Retired Pro-Lite TechnologyCranfieldUK Specialised Imaging Ltd PitstoneUK Central Laser Facility STFC Rutherford Appleton LaboratoryDidcotUK Magna-Power Electronics Ltd ReadingUK DeBe Lasers Needham Laser TechnologiesWhitchurchUK Blackett Laboratory Imperial College LondonLondonUK SPIE Europe CardiffUK Professor Emeritus(Physics) University of HullKingston upon HullUK Kentech Instruments Ltd WallingfordUK Department of Physics Clarendon LaboratoryUniversity of OxfordOxfordUK Professor Emeritus Department of PhysicsUniversity of StrathclydeGlasgowUK Department of Physics Durham UniversityDurhamUK Professor Emeritus(Photonics) Heriot-Watt UniversityEdinburghUK Professor Emeritus University of SouthamptonSouthamptonUK Optical Surfaces Ltd KenleyUK JEH Lasers Ltd RugbyUK Scottish Universities Physics Alliance Department of PhysicsUniversity of StrathclydeGlasgowUK ITER Organization Saint-Paul-lez-DuranceFrance Manx Precision Optics Ltd BallasallaUK Laser Lines Ltd BanburyUK Elliot Scientific Ltd MetroTest Scientific GroupHarpendenUK Centre for Plasma Physics Queen’s University BelfastBelfastUK Retired Founderand former MDRofin-Sinar UK LtdHullUK Heraeus Noblelight Ltd CambridgeUK Mirli Books ChelmsfordUK M Squared Lasers Ltd GlasgowUK University of Hertfordshire HatfieldUK E&EO UK Ltd Barton-upon-HumberUK Department of Physics University of YorkYorkUK IC Optical Systems Ltd BeckenhamUK Laser Micromachining Ltd St AsaphUK MBDA UK Ltd Brist

The first demonstration of laser action in ruby was made in 1960 by *** of Hughes Research Laboratories,*** laboratories worldwide began the search for lasers using different materials,operating at different *** the UK,academia,industry and the central laboratories took up the challenge from the earliest days to develop these systems for a broad range of *** historical review looks at the contribution the UK has made to the advancement of the technology,the development of systems and components and their exploitation over the last 60 years.

关键词： high-power lasers history United Kingdom

自由陷阱:数字游民和管理“工作—休闲”边界的纪律实践

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工会理论研究 2024年第4期 66-79页

作者：戴夫·库克姚建华(编译) 徐偲骕(编译) 英国伦敦大学学院人类学系复旦大学新闻学院复旦大学全球传播全媒体研究院上海大学新闻传播学院上海大学中国当代文化研究中心

大多数数字游民追求一种普遍的自由、自主和自决,想象着“超移动自由”以及工作和休闲融合的生活方式与未来。不过本文发现,在实践中,数字游民的工作和生活需要高度的纪律约束,包括外部纪律和自我纪律。一方面,数字游民需要比其他依赖... 详细信息

大多数数字游民追求一种普遍的自由、自主和自决,想象着“超移动自由”以及工作和休闲融合的生活方式与未来。不过本文发现,在实践中,数字游民的工作和生活需要高度的纪律约束,包括外部纪律和自我纪律。一方面,数字游民需要比其他依赖特定地点的劳动者更加自律,甚至要比以往的自我更加自律。另一方面,他们还需要把自我纪律实践与外部规定的纪律相结合,后者由工作空间、基础设施、设备、时间规则、应用程序和流程规定和产生。由此可见,数字游民追求的自由,实际上是一种依靠高效的时间利用建立起来的特定类型的自由,即一种“有纪律的自由”。如果他们想要在工作和生活之间找到平衡,或者在日常生活中体验自我决定的控制和自由感,那就必须接受各种形式的纪律。数字游民可能最初试图实现一种主观的自由形式,成功地将工作、休闲和旅行融合在一起,但最后这种自由还是必须受到纪律的控制。

关键词：数字游民工作—休闲边界纪律实践纵向民族志研究新自由主义

Impact Assessment and Mitigation Techniques for High Penetration Levels of Renewable Energy Sources in Distribution Networks:Voltage-control Perspective

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Journal of Modern Power Systems and Clean Energy 2022年第2期10卷 450-458页

作者： Ahmed S.A.Awad dave Turcotte Tarek H.M.El-Fouly Natural Resources Canada Can-metENERGYVarennesCanadaon leave from the Electrical Power and Machines DepartmentFaculty of EngineeringAin Shams UniversityCairo 11566Egyp Natural Resources Canada CanmetENERGYVarennesCanada Advanced Power and Energy Center Khalifa UniversityAbu DhabiUnited Arab Emirates

The integration of renewable distributed generation(RDG)into distribution networks is promising and increasing ***,high penetration levels of distributed generation(DG)are often limited as they may have an adverse effect on the operation of distribution *** of the operation challenges is the interaction between DG and voltage-control equipment,e.g.,an under-load tap changer(ULTC),which is basically designed to compensate for voltage changes caused by slow load *** integration of variable DGs leads to rapid voltage fluctuations,which can negatively affect the tap operation of *** paper investigates the impact of high penetration levels of RDG on the tap operation of ULTC in distribution networks through *** mitigation techniques that can alleviate this impact are also *** these techniques,constant power-factor mode is regarded as the best trade-off between the simplicity and effectiveness of minimizing the number of tap *** are performed on a Canadian benchmark rural distribution feeder using OpenDSS software.

关键词： Renewable energy distributed generation(DG) voltage regulator load tap changer distribution network.

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远程化工作时代数字游民的内涵与类型探赜

阅江学刊 2024年第4期16卷 103-119页

作者： [美]戴夫·库克姚建华杨涵庚英国伦敦大学学院人类学系复旦大学新闻学院复旦大学马克思主义新闻观教学与研究基地

2010年以来,数字游牧在全球范围内逐步扩展。特别是新冠疫情暴发后,作为数字游牧基础条件的远程工作日渐增多,导致“数字游牧”这一概念的应用范围不断扩大。本文重新定义数字游牧的内涵,并对当代数字游民进行最新的分类,将数字游民细... 详细信息

2010年以来,数字游牧在全球范围内逐步扩展。特别是新冠疫情暴发后,作为数字游牧基础条件的远程工作日渐增多,导致“数字游牧”这一概念的应用范围不断扩大。本文重新定义数字游牧的内涵,并对当代数字游民进行最新的分类,将数字游民细分为五种不同类型,即自由职业数字游民、数字游民企业主、带薪数字游民、实验性数字游民和“扶手椅上”的数字游民。这一分类涉及六个关键变量:流动频率和自主性、以家庭为居住地的实践、国内与跨国旅行、法律合规性、工作与生活平衡以及使用共享工作空间。文章强调,探讨数字游民内涵和类型,不仅能为未来的相关研究提供学术方向,还能帮助研究人员和政策制定者更准确地理解和评估数字游民在现实世界中的背景、动机、实践和影响。

关键词：数字游民数字游牧远程工作士绅化共享工作空间

Evaluation of the cracking and aging susceptibility of asphalt mixtures using viscoelastic properties and master curve parameters

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第1期9卷 106-119页

作者： Runhua Zhang Jo E.Sias Eshan V.dave Department of Civil and Environmental Engineering University of New HampshireDurhamNH 03824USA

Aging can significantly affect the performance of asphalt mixtures, causing increase in stiffness, reduction in relaxation capability and increase in cracking susceptibility. It is also well known that fundamental viscoelastic properties are used for design and modelling of asphalt mixtures and pavement structures to addressing rutting, fatigue and thermal cracking concerns. The objective of this paper is to study how the viscoelastic properties of asphalt mixture change over time, and evaluate and identify the cracking and aging susceptibility of asphalt mixtures with different mix variables during material selection and mixture design. Ten mixtures are evaluated using different laboratory conditioning protocols to simulate a range of aging levels in the field. The complex modulus test is then conducted on the lab aged mixtures to measure the viscoelastic properties in order to construct the dynamic modulus and phase angle master curves. The mixture Glover-Rowe(G-Rm) parameter and the shape parameters of the dynamic modulus and phase angle master curves, including inflection point frequency(-β/γ), difference between the glassy modulus and the inflection point modulus(γ), peak value of phase angle(a) and the horizontal position(frequency) of the peak phase angle value(c), are determined and evaluated for the mixtures with different aging conditions and mix variables. The study indicates the ability of the G-Rmparameter and all the master curve shape parameters to capture the effect of different aging conditions on linear viscoelastic mixture properties, as well as the cracking and aging susceptibility of asphalt mixtures.

关键词： Asphalt mixture Viscoelastic properties Complex modulus and phase angle master curve Master curve shape parameters Aging susceptibility Cracking susceptibility

Intensity of effort and momentary failure in resistance training:Are we asking a binary question for a continuous variable?

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Journal of Sport and Health Science 2022年第6期11卷 644-647页

作者： James P.Fisher James Steele dave Smith School of Sport Health and Social ScienceSolent UniversitySouthamptonSO140YNUK Research Centre for Musculoskeletal and Sports Medicine Manchester Metropolitan UniversityManchesterM156BHUK

*** There is a growing body of research supporting the idea that a plethora of health benefits can result from resistance training using a low volume,high-effort approach(e.g.,increased metabolic rate and bone mineral density,a reduction in blood pressure,and improved muscle quality and insulin sensitivity,among ***,muscular strength and muscle massprimary goals and benefits of participation in resistance trainingare independently strong predictors of longevity and quality of life. Thus,many have sought to identify how the manipulation of resistance training variables might lead to“optimal”adaptations in such outcomes,as evidenced by repeated attempts over recent decades to review the literature and provide consensus statements on this topic.5-10 One variable that is often hotly debated within resistance training is training to failure.

关键词： resistance binary continuous

Any alternatives to rice? Ethnobotanical insights into the dietary use of edible plants by the Higaonon tribe in Bukidnon Province, the Philippines

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Regional Sustainability 2022年第2期3卷 95-109页

作者： dave Paladin BUENAVISTA Eefke Maria MOLLEE Morag MCDONALD Department of Biology Central Mindanao UniversityUniversity TownMaramag8714the Philippines School of Natural Sciences Bangor UniversityBangorLL572DGUnited Kingdom

Though considered an agricultural country,the Philippines is the world’s largest importer of *** persistent problem of insufficient rice supply,however,has been exacerbated by economic crises and natural ***,for the Higaonon tribe in Bukidnon Province,the Philippines,the rich agrobiodiversity and wild edible plants are vital for food security and resilience since the mountainous terrain in this province presents a challenge for rice *** gain insight from the indigenous edible plant knowledge of the Higaonon tribe,we conducted an ethnobotanical research to document the diversity,utilization,and biocultural refugia of both cultivated and wild edible plants.A total of 76 edible plant species belonging to 62 genera and 36 botanical families were *** most represented botanical families included the Fabaceae,Solanaceae,and *** terms of dietary usage,3 species were categorized as cereals;8 species were white roots,tubers,and plantains;3 species were vitamin A-rich vegetables and tubers;16 species were green leafy vegetables;12 species were categorized as other vegetables;2 species were vitamin A-rich fruits;27 species were classified as other fruits;7 species were legumes,nuts,and seeds;and 8 species were used as spices,condiments,and *** the statistical software R with ethnobotanyR package,we further calculated the ethnobotanical indices(use-report(UR),use-value(UV),number of use(NU),and fidelity level(FL))from 1254 URs in all 9 food *** species with the highest UV and UR were from a variety of nutrient-rich edible plants such as Ipomoea batatas(L.)Lam.,Musa species,Colocasia esculenta(L.)Schott,Zea mays L.,and Manihot esculenta *** extensive utilization of root and tuber crops along with corn and plantain that contain a higher amount of energy and protein,carbohydrates,minerals,and vitamins were shown to be an important nutrient-rich alternatives to *** males appeared to be more

关键词： Sustainable Development Goals(SDGs) Food security Neglected and underutilized species Indigenous peoples Ethnobotany Nutrition The Philippines