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Статті в журналах з теми "Complex stress state"
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Vasilenko, A. T. "Stress state of complex plates." International Applied Mechanics 33, no. 12 (December 1997): 990–95. http://dx.doi.org/10.1007/bf02700939.
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LUZGIN, L. A., H. SH GAZIZOV, and R. SH VALIEV. "STRESS-STRAIN STATE AXISYMMETRICAL DIE." Fundamental and Applied Problems of Engineering and Technology, no. 4 (2021): 118–23. http://dx.doi.org/10.33979/2073-7408-2021-348-4-118-123.
Повний текст джерелаАнотація:
The ways to increase strength and durability of axisymmetric pre-stressed multilayer cylinders were studied in this article. Cold forging dies for extrusion of complex shape parts is an example of such equipment. The process of complex shape part cold extrusion was modeled; the internal contact pressure along the interface between die and forged part is studied. In the result, the design procedure and specialized software were developed to allow automated design of complex multilayer equipment and structures. Several approaches and recommendations are proposed for multilayer cylinders design in order to increase it durability
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Wang, Tie-Jun. "Damage-based local stress criterion for crack initiation under complex stress state." International Journal of Fracture 55, no. 4 (June 1992): R61—R64. http://dx.doi.org/10.1007/bf00035196.
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Zavoichinskii, B. I., and E. B. Zavoichinskaya. "Micromechanics of metal failure in a complex stress state." Journal of Machinery Manufacture and Reliability 40, no. 2 (April 2011): 120–26. http://dx.doi.org/10.3103/s1052618811020208.
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Volkov, I. A., L. A. Igumnov, D. A. Kazakov, D. N. Shishulin, and I. V. Smetanin. "DEFINING RELATIONS OF TRANSIENT CREEP UNDER COMPLEX STRESS STATE." Problems of Strength and Plasticity 78, no. 4 (2016): 436–51. http://dx.doi.org/10.32326/1814-9146-2016-78-4-436-451.
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Mykhailovkyi, Denis. "Design conditions of timber strength under complex stress state." ScienceRise 9 (September 26, 2018): 30–33. http://dx.doi.org/10.15587/2313-8416.2018.143020.
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Tsybul’ko, A. E., and E. A. Romanenko. "Fatigue strength of materials in a complex stress state." Russian Engineering Research 30, no. 1 (January 2010): 23–25. http://dx.doi.org/10.3103/s1068798x10010065.
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Reznikova, N. P. "Swelling of a material in a complex stress state." Soviet Physics Journal 29, no. 1 (January 1986): 20–25. http://dx.doi.org/10.1007/bf00892547.
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Li, Hang Zhou, Hong Jian Liao, Bo Han, and Li Song. "A Nonlinear Constitutive Model for Soil under Complex Stress State." Key Engineering Materials 535-536 (January 2013): 561–64. http://dx.doi.org/10.4028/www.scientific.net/kem.535-536.561.
Повний текст джерелаАнотація:
It is fundamental to predict the stress-strain behavior of soils to control the stability of the geotechnical engineering. A Duncan-Chang constitutive model is analyzed and found that it ignores the effect of the intermediate principal stress. A unified strength theory is investigated and revised. The lode parameter is introduced into the unified strength theory. The unified friction angle and cohesion which may reflect the influence of the intermediate principal stress and verified by the polyaxial tests are obtained. The compressive strength revised from the unified strength theory is used to replace the Mohr-Coulomb criterion and introduced into the Duncan-Chang model. A modified constitutive model is proposed, which is verified by the plane strain tests. The result shows that the modified constitutive can reflect the effect of the intermediate principal stress, and the Duncan-Chang model is a special case of the modified model when b=0.
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Karev, V. I., D. M. Klimov, Yu F. Kovalenko, and K. B. Ustinov. "Fracture of sedimentary rocks under a complex triaxial stress state." Mechanics of Solids 51, no. 5 (September 2016): 522–26. http://dx.doi.org/10.3103/s0025654416050022.
Повний текст джерелаДисертації з теми "Complex stress state"
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Ševeček, Oldřich. "Solution of General Stress Concentrators in Anisotropic Media by Combination of FEM and the Complex Potential Theory." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-233837.
Повний текст джерелаАнотація:
Disertační práce se věnuje problematice obecných koncentrátorů napětí v anisotropních prostředích. Zejména se jedná o problém trhlin končících na rozhraní dvou různých materiálů, či problém obecného více-materiálového klínu. Cílem práce je vytvořit komplexní nástroj pro posuzování obecných koncetrátorů napětí tj, popis pole napětí v jeho okolí, zahrnutí případného vlivu přemostění trhliny do výsledného pole napětí a definici lomových kritérií pro obecný koncentrátor v anisotropním prostředí. U popisu pole napětí je využit tzv. Lechnického-Strohův formalismus a technika spojitě rozložených dislokací využívající teorii komplexních potenciálů. V práci je rovněž široce uplatněn tzv. dvoustavový "psí"-integrál (pro výpočet různých součinitelů asymptotického rozvoje pro napětí), založený na Bettiho recipročním teorému v kombinaci s metodou konečných prvků. Pro formulaci lomových kritérií je použita teorie tzv. „konečné lomové mechaniky“ a teorie sdružených asymptotických rozvojů. Studován je především vztah mezi ohybem trhliny podél rozhraní a její případnou pentrací do základního materiálu. Veškeré potřebné výpočty jsou prováděny v matematických softwarech MAPLE 10.0, MATLAB 7.1 a konečnoprvkovém systému ANSYS 10.0.
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Куан, Фам Дик. "Критерій граничного стану конструкційних матеріалів з врахуванням пошкоджуваності". Doctoral thesis, Київ, 2019. https://ela.kpi.ua/handle/123456789/30096.
Повний текст джерелаАнотація:
Дисертаційна робота присвячена розробці критерія граничного стану
конструкційних матеріалів, які працюють в умовах складного напруженого стану у
випадку статичного навантаження з урахуванням пошкоджуваності. Для визначення величини параметра пошкоджуваності використовувалися різні
енергетичні підходи, які базуються на зміні фізико-механічних характеристик
матеріалів при простих навантаженнях (розтяг та кручення).
На основі отриманих експериментальних результатів на різних конструкційних
матеріалах, вдосконалено модель опису кінетики накопичення пошкодження,
запропонований Бонора, в залежності від рівня пластичної деформації. Отримано
залежність параметрів моделі та критерія граничного стану від пружно-пластичних
характеристик матеріала. Проведено порівняння отриманих теоретичних значень з
експериментальними.
Розроблена методика визначення кінетики накопичення пошкодження у випадку
кручення циліндричних зразків з врахуванням неоднорідності розподілу деформації
в перерізі зразка.
На основі підходу Давіденкова-Фрідмана розроблено критерій граничного стану
конструкційних матеріалів з врахуванням виду напруженого стану та
пошкоджуваності. Представлено порівняння результатів граничного стану,
отриманих за розробленим критерієм, експериментальними даними, та іншими
методами.
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Fahad, M. K. "The strength of brittle materials under complex states of stress." Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315564.
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El, Ouassouli Amine. "Discovering complex quantitative dependencies between interval-based state streams." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI061.
Повний текст джерелаАнотація:
Les avancées significatives qu’ont connu les technologies de capteurs, leur utilisation croissante ainsi que leur intégration dans les systèmes d’information permettent d’obtenir des descriptions temporelles riches d’environnements réels. L’information générée par de telles sources de données peut être qualifiée d’hétérogène sur plusieurs plans: types de mesures physiques, domaines et primitives temporelles, modèles de données etc. Dans ce contexte, l’application de méthodes de fouille de motifs constitue une opportunité pour la découverte de relations temporelles non-triviales, directement utilisables et facilement interprétables décrivant des phénomènes complexes. Nous proposons d’utiliser un ensemble d’abstraction temporelles pour construire une représentation unifiée, sous forme des flux d’intervalles (ou états), de l’information générée par un système hétérogène. Cette approche permet d’obtenir une description temporelle de l’environnent étudié à travers des attributs (ou états), dits de haut niveau, pouvant être utilisés dans la construction des motifs temporelles. A partir de cette représentation, nous nous intéressons à la découverte de dépendances temporelles quantitatives (avec information de délais) entre plusieurs flux d’intervalles. Nous introduisons le modèle de dépendances Complex Temporal Dependency (CTD) défini de manière similaire à une forme normale conjonctive. Ce modèle permets d’exprimer un ensemble riche de relations temporelles complexes. Pour ce modèle de dépendances nous proposons des algorithmes efficaces de découverte : CTD-Miner et ITLD - Interval Time Lag Discovery. Finalement, nous évaluons les performances de notre proposition ainsi que la qualité des résultats obtenus à travers des données issues de simulations ainsi que des données réelles collectées à partir de caméras et d’analyse vidéoThe increasing utilization of sensor devices in addition to human-given data make it possible to capture real world systems complexity through rich temporal descriptions. More precisely, the usage of a multitude of data sources types allows to monitor an environment by describing the evolution of several of its dimensions through data streams. One core characteristic of such configurations is heterogeneity that appears at different levels of the data generation process: data sources, time models and data models. In such context, one challenging task for monitoring systems is to discover non-trivial temporal knowledge that is directly actionable and suitable for human interpretation. In this thesis, we firstly propose to use a Temporal Abstraction (TA) approach to express information given by heterogeneous raw data streams with a unified interval-based representation, called state streams. A state reports on a high level environment configuration that is of interest for an application domain. Such approach solves problems introduced by heterogeneity, provides a high level pattern vocabulary and also permits also to integrate expert(s) knowledge into the discovery process. Second, we introduced the Complex Temporal Dependencies (CTD) that is a quantitative interval-based pattern model. It is defined similarly to a conjunctive normal form and allows to express complex temporal relations between states. Contrary to the majority of existing pattern models, a CTD is evaluated with automatic statistical assessment of streams intersection avoiding the use of any significance user-given parameter. Third, we proposed CTD-Miner a first efficient CTD mining framework. CTD-Miner performs an incremental dependency construction. CTD-Miner benefits from pruning techniques based on a statistical correspondence relationship that aims to accelerate the exploration search space by reducing redundant information and provide a more usable result set. Finally, we proposed the Interval Time Lag Discovery (ITLD) algorithm. ITLD is based on a confidence variation heuristic that permits to reduce the complexity of the pairwise dependency discovery process from quadratic to linear w.r.t a temporal constraint Δ on time lags. Experiments on simulated and real world data showed that ITLD provides efficiently more accurate results in comparison with existing approaches. Hence, ITLD enhances significantly the accuracy, performances and scalability of CTD-Miner. The encouraging results given by CTD-Miner on our real world motion data set suggests that it is possible to integrate insights given by real time video processing approaches in a knowledge discovery process opening interesting perspectives for monitoring smart environments
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Darwin, Zoe. "Assessing and Responding to Maternal Stress (ARMS) : antenatal psychosocial assessment in research and practice." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/assessing-and-responding-to-maternal-stress-arms-antenatal-psychosocial-assessment-in-research-and-practice(f58f4ced-df4e-49d6-ba08-24f24fade0a5).html.
Повний текст джерелаАнотація:
Background: Antenatal Psychosocial Assessment (APA) has recently been introduced into routine antenatal care, but the ways in which maternity service providers assess and respond to maternal stress are subject of debate. There is a lack of consensus on the instrument(s) of choice and lack of evidence regarding appropriate interventions. Further, national guidelines have not kept apace with the conceptual shift from ‘postnatal depression’ to ‘perinatal anxiety and depression’. Adopting the Medical Research Council Complex Interventions Framework, the ARMS research aimed to inform the development of interventions that support women who are experiencing, or at risk of, mild-moderate mental health disorder in pregnancy. Methods: A mixed methods approach was adopted. In the quantitative element (Study Part 1) participants (n=191) completed a questionnaire when attending for their first formal antenatal appointment, using a procedure and materials that had been previously tested in a pilot study. Details including mental health assessment and referrals were obtained from their health records, following delivery. In the qualitative element (Study Part 2) a sub-sample of women (n=22) experiencing high levels of maternal stress took part in up to three serial in-depth interviews during pregnancy and the early postnatal period.Findings: Maternal stress was found to be common. Using the Edinburgh Postnatal Depression Scale (EPDS) threshold of ≥10, approximately 1 in 4 women were classed as high depression (halving to 1 in 8 at the more conservative threshold of ≥13). Almost 1 in 3 women were classed as high anxiety, using the state scale of the State-Trait Anxiety Inventory (STAI-S, threshold ≥41), compared with 1 in 5 using the two-item GAD (threshold ≥3). Fewer than half of the women identified as high anxiety were identified by both measures. Factor analyses of the symptom measures were consistent with wider literature suggesting a three-item anxiety component of the EPDS; however, concurrent validation using regression analyses did not indicate that the EPDS could be used as an anxiety case finding instrument. Women reported that maternal stress had significant impact on their lives that may not be captured with existing clinical approaches. Women commonly found it difficult to self-assess severity of maternal stress and the assessment process could itself act as an intervention. The research provided the first validation of the depression case finding questions in UK clinical practice. The Whooley items completed in clinical practice identified only half of the possible cases identified by the EPDS, at both commonly adopted EPDS thresholds. Inclusion of the Arroll 'help' question as a criterion improved specificity of the assessment completed in clinical practice but substantially compromised sensitivity, missing 9 in 10 possible cases. Women’s mental health history and treatment history were similarly under-reported, particularly concerning anxiety. APA was introduced into routine clinical practice without attention to topics of relevance to women, context of disclosure or to provision of adequate resources for consistently responding to identified need. Women experiencing, or at risk of, mild-moderate disorder were thus usually ineligible for further support. Implications: Care pathways are needed that encompass both assessing and responding to maternal stress, where communication with health professionals, subsequent referral and management are addressed. The development, implementation and evaluation of low-cost resources embedded in such pathways are a priority and the research presented in the thesis offers a foundation on which to build.
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Doering, Sharon. "Human Trafficking Recovery: Conceptual and Dimensional Considerations in a Stage Model." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1336508012.
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Губашова, Валентина Євгенівна. "Обґрунтування раціональних технологічних параметрів струменевої цементації в складних геотехнічних умовах". Doctoral thesis, Київ, 2021. https://ela.kpi.ua/handle/123456789/40256.
Повний текст джерелаАнотація:
Дисертація присвячена обґрунтуванню раціональних технологічних параметрів струменевої цементації в складних геотехнічних умовах. В роботі досліджено та встановлено взаємозв’язки технологічних параметрів струменевої цементації з діаметром ґрунтоцементної колони в різних типах ґрунтів. На основі отриманих експоненціальних залежностей діаметра ґрунтоцементного елементу круглого перерізу від енергії високонапірного струменя цементного розчину розроблено методику розрахунку діаметра струменево-цементаційної колони. В процесі дослідження експериментальним шляхом доведено змінення фізико-механічних властивостей ґрунту, що оточує ґрунтоцементний елемент під час його виконання за струменевою технологією. На підставі математичного моделювання визначено закономірності формування в ґрунтових масивах зон з поліпшеними фізико-механічними параметрами в міжколонному просторі в різних типах ґрунтів. Удосконалено методику комп’ютерного моделювання управління напружено-деформованим станом основи будівлі під час її підсилення струменево-цементаційними елементами з урахуванням складних геотехнічних умов.
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Скрипченко, Наталья Борисовна. "Контактное взаимодействие сложнопрофильных деталей машиностроительных конструкций с учетом локальной податливости поверхностного слоя". Thesis, НТУ "ХПИ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/19908.
Повний текст джерелаАнотація:
Диссертация на соискание научной степени кандидата технических наук по специальности 05.02.09 – динамика и прочность машин. Национальный технический университет "Харьковский политехнический институт", Министерство образования и наук Украины, Харьков, 2016.
Диссертация посвящена разработке подходов, методов и моделей для исследования напряженно-деформированного состояния сложнопрофильных шероховатых тел с учетом контактного взаимодействия. В работе решена задача анализа контактного взаимодействия сложнопрофильных элементов машиностроительных конструкций с учетом дополнительных факторов влияющих на распределение контактных давлений (учет податливости поверхностного слоя, конечность размеров контактирующих тел). Предложено для анализа контактного взаимодействия сложнопрофильных тел применять вариант метода граничных уравнений, дополненный моделью учета податливости промежуточного слоя. Для моделирования упругого слоя применена модель Винклера. Предложенный метод исследования контактного взаимодействия объединяет в рамках единых соотношений "локальные" и "глобальные" характеристики податливости контактирующих шероховатых тел. Решен ряд прикладных задач анализа контактного взаимодействия, а именно проведено исследование влияния формы зазора и податливости шероховатого слоя на характер распределений контактных давлений, проведено исследование контактного взаимодействия прямоугольного в плане штампа со скруглениями, решена задача контакта подшипника качения с модифицированным двурадиусным роликом, проведен анализ взаимодействия шаровых поршней с беговыми дорожками гидрообъмной передачи танковой трансмиссии. Во время выполнения работы проведен ряд экспериментальных исследований для анализа контактного взаимодействия сложнопрофильных элементов машиностроительных конструкций с учетом податливости шероховатого слоя. Для исследования контактных давлений задействована технология контактных отпечатков с использованием чувствительных пленок. Проведено сравнение полученных численных результатов исследований с полученными экспериментальными данными. Подтверждена точность и достоверность предложенных методов и моделей, а также созданного программно-модельного комплекса.The thesis in qualification for a scientific degree of Candidate of Technical Science in speciality 05.02.09 - dynamics and strength of machines, National Technical University "Kharkiv Polytechnical Institute", Kharkiv, 2016. The thesis is devoted to development of approaches, methods and models for analysis of stress-strain state of complex-shaped bodies with account for their contact over rough surfaces. In the present work the contact problem is solved for complex-shaped elements of engineering structures with local compliance of the surface layer. For this purpose a variation to the boundary integral equations method extended with a Winkler-type model of elastic layer is proposed. The resulting approach combines in a unified formulation the "local" and "global" compliance characteristics of the contacting rough bodies. The numerical implementation of the boundary element method is included in a software-and-model complex for analysis of contact interaction of complex-shaped bodies. A number of applied contact problems is solved. Namely, the influence of the gap and rough layer compliance on the contact pressure distribution is studied for the following cases: contact of a rectangular round-end stamp with a flat surface, junction of a rolling bearing and a modified double-radius roller, normal traction between spherical pistons and treadmills of a tank transmission. Numerical results of the research are compared to experimental data. Accuracy and reliability of the proposed methods and models, as well as special-purpose software-andmodel complex are confirmed.
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Скріпченко, Наталія Борисівна. "Контактна взаємодія складнопрофільних деталей машинобудівних конструкцій з урахуванням локальної податливості поверхневого шару". Thesis, ФО-П Дуюнова Т. В, 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/19907.
Повний текст джерелаАнотація:
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.02.09 – динаміка та міцність машин. Національний технічний університет "Харківський політехнічний інститут", Міністерство освіти і науки України, Харків, 2016.
Дисертація присвячена розробці підходів, методів і моделей для дослідження напружено-деформованого стану складнопрофільних тіл з урахуванням їхнього контакту по шорстких поверхнях. У роботі розв'язана задача аналізу контактної взаємодії складнопрофільних елементів машинобудівних конструкцій за наявності локальної податливості поверхневого шару. Для цього запропоновано варіант методу граничних рівнянь, в який додана модель пружного проміжного шару за Вінклером. Отриманий метод дослідження контактної взаємодії об'єднує в рамках єдиних співвідношень "локальні" та "глобальні" характеристики податливості контактуючих шорстких тіл. Числова реалізація методу граничних елементів здійснена в спеціалізованому програмно-модельному комплексі для дослідження контактної взаємодії складнопрофільних тіл. Розв'язано низку прикладних задач аналізу контактної взаємодії, а саме проведено дослідження впливу форми зазору і податливості шорсткого шару на характер розподілів контактного тиску у наступних випадках: контакту прямокутного в плані штампа з округленнями з плоскою поверхнею, спряження підшипника кочення з модифікованим дворадіусним роликом, передачі зусиль між кульовими поршнями та біговими доріжками в гідрооб'ємній передачі танкової трансмісії. Проведене порівняння отриманих числових результатів досліджень з експериментальними даними. Підтверджено точність і достовірність запропонованих методів та моделей, а також створеного програмно-модельного комплексу.The thesis in qualification for a scientific degree of Candidate of Technical Science in speciality 05.02.09 - dynamics and strength of machines, National Technical University "Kharkiv Polytechnical Institute", Kharkiv, 2016. The thesis is devoted to development of approaches, methods and models for analysis of stress-strain state of complex-shaped bodies with account for their contact over rough surfaces. In the present work the contact problem is solved for complex-shaped elements of engineering structures with local compliance of the surface layer. For this purpose a variation to the boundary integral equations method extended with a Winkler-type model of elastic layer is proposed. The resulting approach combines in a unified formulation the "local" and "global" compliance characteristics of the contacting rough bodies. The numerical implementation of the boundary element method is included in a software-and-model complex for analysis of contact interaction of complex-shaped bodies. A number of applied contact problems is solved. Namely, the influence of the gap and rough layer compliance on the contact pressure distribution is studied for the following cases: contact of a rectangular round-end stamp with a flat surface, junction of a rolling bearing and a modified double-radius roller, normal traction between spherical pistons and treadmills of a tank transmission. Numerical results of the research are compared to experimental data. Accuracy and reliability of the proposed methods and models, as well as special-purpose software-andmodel complex are confirmed.
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Martin, André. "Minimizing Overhead for Fault Tolerance in Event Stream Processing Systems." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-210251.
Повний текст джерелаАнотація:
Event Stream Processing (ESP) is a well-established approach for low-latency data processing enabling users to quickly react to relevant situations in soft real-time. In order to cope with the sheer amount of data being generated each day and to cope with fluctuating workloads originating from data sources such as Twitter and Facebook, such systems must be highly scalable and elastic. Hence, ESP systems are typically long running applications deployed on several hundreds of nodes in either dedicated data-centers or cloud environments such as Amazon EC2. In such environments, nodes are likely to fail due to software aging, process or hardware errors whereas the unbounded stream of data asks for continuous processing.
In order to cope with node failures, several fault tolerance approaches have been proposed in literature. Active replication and rollback recovery-based on checkpointing and in-memory logging (upstream backup) are two commonly used approaches in order to cope with such failures in the context of ESP systems. However, these approaches suffer either from a high resource footprint, low throughput or unresponsiveness due to long recovery times. Moreover, in order to recover applications in a precise manner using exactly once semantics, the use of deterministic execution is required which adds another layer of complexity and overhead.
The goal of this thesis is to lower the overhead for fault tolerance in ESP systems. We first present StreamMine3G, our ESP system we built entirely from scratch in order to study and evaluate novel approaches for fault tolerance and elasticity. We then present an approach to reduce the overhead of deterministic execution by using a weak, epoch-based rather than strict ordering scheme for commutative and tumbling windowed operators that allows applications to recover precisely using active or passive replication. Since most applications are running in cloud environments nowadays, we furthermore propose an approach to increase the system availability by efficiently utilizing spare but paid resources for fault tolerance. Finally, in order to free users from the burden of choosing the correct fault tolerance scheme for their applications that guarantees the desired recovery time while still saving resources, we present a controller-based approach that adapts fault tolerance at runtime. We furthermore showcase the applicability of our StreamMine3G approach using real world applications and examples.
Книги з теми "Complex stress state"
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New Jersey. Legislature. General Assembly. Light Rail Transit Legislative Panel. Panel meeting of Assembly Light Rail Transit Legislative Panel: Transportation issues concerning potential redevelopment of the Sports Complex : [April 14, 2003, East Rutherford, New Jersey]. Trenton, N.J: The Unit, 2003.
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Houser, Jim. Babel /c[compiled and edited by Roger Gastman and Jim Houser ; foreword written by Shelley Spector]. Corte Madera, CA: Gingko Press in association with R77, 2005.
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Andreas, Joel. Addicted to war: Why the U.S. can't kick militarism. 2nd ed. Oakland, CA: AK Press, 2002.
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Neil, Cohn, Latimer Gene, and Burke Paul, eds. We the people: A call to take back America. Portland, OR: CoreWay Media, 2004.
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A, Lebedev A., ed. Handbook of mechanical properties of structural materials at a complex stress state. New York: Begell House, 2000.
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author, Mann Eric, ed. Surviving school stress: Strategies for well-being in today's complex world. 2016.
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Cates, M. Complex fluids: the physics of emulsions. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198789352.003.0010.
Повний текст джерелаАнотація:
These lectures start with the mean field theory for a symmetric binary fluid mixture, addressing interfacial tension, the stress tensor, and the equations of motion (Model H). We then consider the phase separation kinetics of such a mixture: coalescence, Ostwald ripening, its prevention by trapped species, coarsening of bicontinuous states, and the role of shear flow. The third topic addressed is the stabilization of emulsions by using surfactants to reduce or even eliminate the interfacial tension between phases; the physics of bending energy, which becomes relevant in the latter case, is then presented briefly. The final topic is the creation of long-lived metastable emulsions by adsorption of colloidal particles or nanoparticles at the fluid–fluid interface; alongside spherical droplets, these methods can be used to create a range of unconventional structures with potentially interesting properties that are only now being explored.
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Stoddard, Frederick J., David M. Benedek, Mohammed R. Milad, and Robert J. Ursano, eds. Trauma- and Stressor-Related Disorders. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780190457136.001.0001.
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The Primer on Trauma- and Stressor-Related Disorders provides new practitioners and trainees, as well as experienced clinicians and researchers, with the needed translational and evidence-based information for prevention, diagnosis, and treatment of PTSD and closely related disorders. The translational and evidence-based approach presented in the Primer is the state-of-the-art for clinicians and basic scientists, linking empirically supported practices with their theoretical, neurobiological, and epidemiological bases. The international experts in the field bring outstanding depth and breadth to the topic.Trauma affects millions of children, adolescents and adults, with manifestations including posttraumatic stress disorder (PTSD), acute stress disorder, traumatic grief or persistent complex bereavement disorder, adjustment disorder, and reactive attachment and disinhibited social engagement disorders. Trauma- and stressor-related disorders are the only diagnoses requiring a traumatic or stressful event. They affect millions of people worldwide due to abuse, accidents, disasters, refugee status, genocide, and war. Genetic, neurobiological, diagnostic, and treatment research explores the causative linkages to developmental trauma, and other mental and physical conditions. These disabling disorders predict high risk of depression, medical-surgical problems, substance abuse, suicidal behavior, anxiety and dissociative disorders.To address these common and often comorbid conditions, Drs. Frederick J. Stoddard Jr., David M. Benedek, Mohammed R. Milad, and Robert J. Ursano present an up-to-date expertly edited volume to provide mental health students, trainees, and professionals with critical information, plus updates on the new advances in the field and illustrative cases.
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O’Flaherty, Brendan M., Chia-Chun Hsu, M. Anzar Abbas, and Donald G. Rainnie. Cellular Physiology of the Basolateral Complex of the Amygdala and Its Modulation by Stress. Edited by Israel Liberzon and Kerry J. Ressler. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780190215422.003.0003.
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Fear is a critical emotional response that allows an organism to safely navigate through dangerous environments. The neural systems underlying the fear response have been well characterized, and include the amygdala, hippocampus, prefrontal cortex, bed nucleus of stria terminalis, nucleus accumbens, and others. While normally these brain regions coordinate to produce an appropriate fear response, the fear network in humans can become dysregulated after a traumatic event. The resulting phenotype of hyperarousal, avoidance, and re-experiencing of fear known as post-traumatic stress disorder (PTSD) is a growing problem in the United States. This chapter focuses on the role of the basolateral complex (BLC) of the amygdala, which has been implicated in the neuropathology of PTSD, particularly the hyperarousal, fear generalization, and fear extinction deficits characteristic of the disorder, as well as aspects of the microcircuitry, network connectivity, and neuromodulation of the BLC that may be involved in the pathophysiology of PTSD.
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Mottram, Linda-Jayne, and Gavin G. Lavery. The metabolic and nutritional response to critical illness. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0202.
Повний текст джерелаАнотація:
The metabolic response to critical illness is complex and affects every body system. The first phase of this response is characterized by increased hypothalamic pituitary activity and resistance (decreased response) to effector hormones in many target tissues. Cytokines released in the early stages of such illness may be important as they appear to stimulate the hypothalamic pituitary axis directly as part of this ‘stress response’. This phase is considered ‘adaptive’ (helpful), increasing the availability of glucose, free fatty acids, and amino acids as substrates for vital organs. However, in prolonged illness, the neuroendocrine response is very different with damped hypothalamic responses, leading to a state in which catabolism predominates, leading to what might be termed the critical illness wasting syndrome. The gastrointestinal (GI) failure often associated with prolonged critical illness appears to be due, at least in part, to an altered neuroendocrine environment. The poor nutritional state associated with GI failure exacerbates the catabolic response, prolonging illness and the period of intensive care management required by the patient. The result is increased mortality and, in survivors, a more prolonged recovery/rehabilitation process.
Частини книг з теми "Complex stress state"
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Janahmadov, Ahad Kh, and Maksim Javadov. "Stress–Strain State of Sealants of Complex Shapes." In Materials Forming, Machining and Tribology, 327–69. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93861-5_7.
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Giginyak, Felix F., Aleksandr A. Lebedev, Boris T. Timofeev, Yurij G. Dragunov, Andrej V. Getmanchuk, and Valentin F. Titov. "Life of Structural Steels Under Cyclic Loading at Complex Stress State." In Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials—3, 805–10. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2860-5_127.
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Perreux, D., C. Oytana, and D. Varchon. "Static and Fatigue Fracture of Composites in Complex State of Stress." In Developments in the Science and Technology of Composite Materials, 515–20. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1123-9_71.
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Dimaki, Andrey V., and Evgeny V. Shilko. "Theoretical Study of Physico-mechanical Response of Permeable Fluid-Saturated Materials Under Complex Loading Based on the Hybrid Cellular Automaton Method." In Springer Tracts in Mechanical Engineering, 485–501. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_21.
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AbstractWe give a brief description of the results obtained by Prof. Sergey G. Psakhie and his colleagues in the field of theoretical studies of mechanical response, including fracture, of permeable fluid-saturated materials. Such materials represent complex systems of interacting solid and liquid phases. Mechanical response of such a medium is determined by processes taking place in each phase as well as their interaction. This raised a need of developing a new theoretical approach of simulation of such media—the method of hybrid cellular automaton that allowed describing stress-strain fields in solid skeleton, transfer of a fluid in crack-pore volume and influence of fluid pressure on the stress state of the solid phase. The new method allowed theoretical estimation of strength of liquid-filled permeable geomaterials under complex loading conditions. Governing parameters controlling strength of samples under uniaxial loading and shear in confined conditions were identified.
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Okada, H., G. Yagawa, H. Kawai, K. Shijo, D. Fujita, Y. Kanda, T. Fujisawa, and T. Iribe. "The State-of-the-Art Methodology to Compute the 3-D Stress Intensity Factors for Arbitrary Shaped Cracks in Complex Shaped Structures." In Computational Methods in Engineering & Science, 200. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-48260-4_46.
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Zhang, Le Wen, Shu Cai Li, and Ying Wang. "Research on Fracture Damage Coupled with Crack Arrest by Anchorage Model of Discontinuous Jointed Rock Mass under the State of Complex Stress." In Advances in Fracture and Damage Mechanics VI, 189–92. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-448-0.189.
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Johnson, G. C., and J. J. Dike. "Complete Evaluation of Residual Stress States Using Acoustoelasticity." In Review of Progress in Quantitative Nondestructive Evaluation, 1391–98. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0979-6_61.
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Häusler, F. U., H. G. Matthies, and C. S. Moore. "Sea Ice Under Complex Stress States: Constitutive Modelling and Testing." In Ice-Structure Interaction, 363–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-84100-2_18.
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Vassilopoulos, Anastasios P., and Thomas Keller. "Life Prediction Under Multiaxial Complex Stress States of Variable Amplitude." In Engineering Materials and Processes, 199–232. London: Springer London, 2011. http://dx.doi.org/10.1007/978-1-84996-181-3_7.
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Wu, Pengfei, Chong Zhang, Yanshan Lou, Qiang Chen, and Haiqing Ning. "Plastic and Fracture Characteristics of WE43 Mg Alloy Under Complex Stress States." In Forming the Future, 647–55. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75381-8_53.
Повний текст джерелаТези доповідей конференцій з теми "Complex stress state"
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Cui, Yi, Yongbo Zhang, Zhihua Wang, Huimin Fu, and Wenjing Shi. "Damage State Estimation for Reusable Spacecraft under Complex Stress." In 2020 IEEE 7th International Conference on Industrial Engineering and Applications (ICIEA). IEEE, 2020. http://dx.doi.org/10.1109/iciea49774.2020.9102006.
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Cui, Yi, Yongbo Zhang, Zhihua Wang, and Wenjing Shi. "Damage State Estimation for Reusable Spacecraft under Complex Stress." In ICIEA 2021-Europe: 2021 The 8th International Conference on Industrial Engineering and Applications. New York, NY, USA: ACM, 2021. http://dx.doi.org/10.1145/3463858.3463884.
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Xianghai, Chai, Wang Zhiqiang, and Tang Zhongbin. "Failure Criteria of Diffusion-Bonded Seam Under Complex Stress State." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43837.
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Diffusion-bonded titanium hollow warren structures have been successfully used on aircraft engine components, such as fan blade, etc., for which failure behavior under impact load is one of the major considerations during design. Studies show that the welding seam de-bonding is the major failure mechanisms under the impact loads. To effectively simulate the de-bonding, phenomenological effective bond strength needs to be properly defined for both the girder region and the edges. In this paper, the bond strength at the hollow region is calibrated through quasi-static tensile tests, in which the specimens are properly designed to represent the cross-section of the hollow region of a typical warren structure. Then, the strength of the edge region is estimated through an inverse method based on the analysis-test correlation of a hollow panel impact test. Such multi-factor coupled seam failure criteria can provide reasonable accordance with test result in the simulation of impact failure of the hollow structure. This means the model with such failure criteria incorporated can provide a useful reference to the aircraft engine hollow warren structure components design.
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Nazarov, V. V., and A. R. Lepeshkin. "Analysis of various equivalent stress options for describing the creep rupture process under a complex stress state." In MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2020): Proceeding of the 14th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0037057.
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Haque, Mohammad Shafinul, and Calvin M. Stewart. "Selection of Representative Stress Function Under Multiaxial Stress State Condition for Creep." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65296.
Повний текст джерелаАнотація:
Drives to develop more efficient pressure vessel and piping systems has led to complex geometry containing discontinuities such as holes, grooves, gaskets, crevices, notches etc. A multiaxial state of stress often develops in complex engineering components subject to creep conditions. Under multiaxial creep, the rupture life and creep ductility are not consistent with uniaxial creep experiments. A common practice to account for multiaxial creep is to introduce a scalar representative stress or strain that describes the multiaxial state within the materials enabling accurate predictions of rupture and creep ductility. Many functions have been proposed in literature and international pressure vessel and piping codes and standards. The ASME B&PV III, French RCC-MR, and British R5 recommends different phenomenological approaches to multiaxial creep. In this study, seven representative stress and eight representative strain functions are evaluated. The skeletal point approach to calibrating these functions is discussed. The incompressibility of the representative stress functions is analyzed. Rupture surfaces of the representative stress functions under biaxial stress conditions are generated to compare the advantages and limitations of the functions. Several functions are found to exhibit divide by zero errors and/or imaginary number errors leading to unstable and discontinuous rupture surfaces. It is observed that the selection of an appropriate representative function is dependent on loading condition, geometry, and material properties. The Hayhurst and Huddleston representative stress functions are found as the most suitable functions to predict multiaxial rupture for a general multiaxial stress states. Finally, a guideline to the selection of the appropriate representative stress function and the associated incompressibility condition is presented.
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Konovalov, Vladimir, Denis Tarasov, Vladimir Zaitsev, and Yuriy Rodionov. "Mathematical Modeling of the Stress-Strain State of a Flexible Thread under the Action of Transverse Impact." In 2019 XXI International Conference Complex Systems: Control and Modeling Problems (CSCMP). IEEE, 2019. http://dx.doi.org/10.1109/cscmp45713.2019.8976590.
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Shupletsova, O. N. "Obtaining barley genotypes in selective in vitro systems with complex resistance to soil stress factors." In CURRENT STATE, PROBLEMS AND PROSPECTS OF THE DEVELOPMENT OF AGRARIAN SCIENCE. Federal State Budget Scientific Institution “Research Institute of Agriculture of Crimea”, 2020. http://dx.doi.org/10.33952/2542-0720-2020-5-9-10-99.
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The aim of the work was to develop selective in vitro systems and obtain on their basis the initial breeding material of spring barley adapted to adverse soil conditions – increased acidity, toxicity of aluminum and heavy metals, drought. In the process of research, optimal patterns for selecting callus lines on selective media using various combinations of stress factors were identified: Al3 + (20–40 mg/l), H+ (4.0–6.0 pH units), Cd2 + (10-20 mg/l), Mn2 + (100–250 mg/l) and osmotic (10–20 % polyethyleneglycol). In the proposed in vitro selective systems, more than a thousand regenerated plants were obtained. Varieties created on the basis of regenerants exceed the standard in yield, have high productive tillering (29.0–67.5 % higher than the standard) and dense spike (4.5–6.6 % higher than the standard). Their advantage is due to resistance to lodging, a high level of survival, germination and environment-forming activity of the root system.
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Lyublinskiy, Valery. "Stress-Strain State Multistory Buildings and Stiffness Shear Bonds." In The 13th International Conference on Contemporary Problems of Architecture and Construction. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/p-gez359.
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The paper considers issues the nonlinear behavior of shear bonds affecting the changes in the distribution of stresses and strains in vertical structures, as well as to compare these stresses and strains with the linear statement of the problem solution in which the compliance of the bonds is constant. In a complex multiconnected system of the multistory building, the new redistribution of stresses arises, which does not coincide with the original distribution of stresses. To correct the stiffness value for the bonds, the experimental data of MGSU were used. A secant module was used to determine the stiffness for links such as lintels. Loading was performed by the step method. Redistribution of stresses in the load-bearing elements of the building showed their significant leveling. The issue of ultimate deformations of shear bonds limiting the process of redistribution of stresses and deformations requires discussion.
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Narumi, Takatsune, Hideaki Hoshi, Tomohiko Muraki, and Tomiichi Hasegawa. "Mechanical Properties of Complex Structure Formed From Electro-Convection State of Smectic Liquid Crystal." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-14010.
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In the present study, electro-rheological characteristics of a liquid crystal (8CB) in smectic-A phase were investigated utilizing a parallel-plate type rheometer under a stress control mode. Solid like behaviors of the liquid crystal under DC electric fields were mainly examined. Bingham-like properties were observed and yield stresses measured were affected with the electric field conditions. When the electric field strength was low, the yield stress was almost the same as that obtained under no electric field. Above a threshold of DC electric field strength, the yield stress increased. It was clarified that the increase in the yield stress was caused with the complex structure formed in cooling process from an electro-convection state in nematic phase. Mechanical property changes after deformation of the structure were also examined as changes in dynamic viscoelasticities under condition of very small strain amplitude and the yield stress. The properties were measured before and after the deformation and compared. Moreover, the deformed structure of the liquid crystal was visualized with a polarizing microscope. Since the initial structures formed after the cooling have unevenness, the strength of the structure varied widely. When the small deformation is applied, peculiar changes in the strength were observed, i.e. the G’ measured was increased or decreased after the deformation. Moreover, the values measured after the deformation had reproducibility despite of the scattered initial data. We observed growth of typical optical patterns in the visualization of the structure and it is considered that defects like focal conic domains were generated and developed. After large deformation, the strength of the structure decreased and the deformed structure had almost no elastic properties. The structures were changed to irregular flow structures.
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Petrova, Y. N., and D. S. Afenchenko. "APPLICATION OF FINITE ELEMENT COMPLEX ANSYS FOR DETERMINING THE LIMIT CHARACTERISTICS OF STRUCTURAL ELEMENTS." In STATE AND DEVELOPMENT PROSPECTS OF AGRIBUSINESS Volume 2. DSTU-Print, 2020. http://dx.doi.org/10.23947/interagro.2020.2.78-81.
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The article considers the calculated mathematical model of the stress-strain state of the beams of technological equipment experiencing bending using the ANSYS finite element complex, and it is tested. The use of this method contributes to the quick and cost-effective solution of design problems in the food and processing industry.
Звіти організацій з теми "Complex stress state"
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Rine, Kristin, Roger Christopherson, and Jason Ransom. Harlequin duck (Histrionicus histrionicus) occurrence and habitat selection in North Cascades National Park Service Complex, Washington. National Park Service, April 2022. http://dx.doi.org/10.36967/nrr-2293127.
Повний текст джерелаАнотація:
Harlequin ducks (Histrionicus histrionicus) are sea ducks that migrate inland each spring to nest along fast-flowing mountain streams. They are considered one of the most imperiled duck species in North America and occur in two distinct populations on the Atlantic and Pacific coasts. The Pacific coast population includes Washington State, where harlequin ducks breed in the Olympic, Cascade, and Selkirk Mountains. This species is designated as a Management Priority Species by the National Park Service within North Cascades National Park Service Complex (NOCA). This report summarizes harlequin duck surveys conducted during 15 years across a 27-year period (1990 and 2017) on major streams within NOCA, and incidental observations collected from 1968–2021. The primary objectives of these surveys were to 1) document the distribution and abundance of harlequin duck observations within NOCA boundaries, 2) describe productivity (number of broods and brood size), 3) describe breeding chronology of harlequin ducks, and 4) describe habitat characteristics of breeding streams. Sixty-eight stream surveys over 15 years resulted in observations of 623 individual harlequin ducks comprising various demographics, including single adults, pairs, and broods. In addition, we collected 184 incidental observations of harlequin ducks from visitors and staff between 1968–2021. Harlequin ducks were observed on 22 separate second- to sixth-order streams throughout NOCA across the entire 53-year span of data, both incidentally and during harlequin duck surveys by Park staff. Harlequin ducks were detected on 8 of the 13 streams that were actively surveyed. Excluding recounts, 88.7% (n = 330) of individual harlequin duck observations during surveys occurred in the Stehekin River drainage. Between all surveys and incidental observations, 135 unpaired females without broods were sighted across all NOCA waterways. Thirty-nine broods were recorded between NOCA surveys and incidental observations, with a mean brood size of 3.61 (± 1.44 SD; range = 2–10). Breeding pairs were recorded as early as April 5 and were seen on streams until June 15, a period of less than seven weeks (median: May 2), but most pairs were observed within a 3-week span, between April 26 and May 17. Single females (unpaired with a male, with (an)other female(s), or with a brood) were observed on streams between April 26 and August 25 (median: July 3), though most observations were made within a 5-week period between June 12 and July 19. Habitat data collected at adult harlequin duck observation sites indicate that the birds often used stream reaches with features that are characteristic of high-energy running water. While adults occupied all instream habitat types identified, non-braided rapids and riffles were used most frequently, followed by pools and backwaters. Larger instream substrate sizes (cobbles and boulders) were present at most observation sites. Adult harlequin ducks were more often found at locations that lacked visible drifting or lodged woody debris, but drift debris was a slightly more abundant debris type. The presence of gravel bars and at least one loafing site was common. Adult harlequin ducks were more often observed in association with vegetation that offered some cover over the channel, but not where banks were undercut. The average channel width at adult observation sites was 34.0 m (range: 6-80 m; n = 114) and 27.6 m (± 15.7 m; range: 10-60 m; n = 12) at brood observation sites. Compared to adult harlequin duck sites, broods were observed more frequently in low velocity habitat (pools, backwaters), but rarely in rapids. Cobble and boulder substrates were still the most dominant substrate type. Contrary to adult ducks, broods were observed most often observed in meandering stream channels, a morphology indicative of low gradient, low velocity stream reaches. Most broods were observed in stream reaches with gravel bars, loafing sites, and...
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Herbert, Siân. Maintaining Basic State Functions and Service Delivery During Escalating Crises. Institute of Development Studies (IDS), May 2021. http://dx.doi.org/10.19088/k4d.2021.099.
Повний текст джерелаАнотація:
This rapid literature review explores how to maintain essential state functions and basic service delivery during escalating conflict situations. It draws on literature and ideas from various overlapping agendas including development and humanitarian nexus; development, humanitarian and peacebuilding nexus (the “triple nexus”); fragile states; state-building; conflict sensitivity; resilience; and conflict prevention and early warning. There has been an extensive exploration of these ideas over the past decades: as the international development agenda has increasingly focussed on the needs of fragile and conflict-affected contexts (FCAS); as violent conflicts have become more complex and protracted; as the global share of poverty has become increasingly concentrated in FCAS highlighting the need to combine humanitarian crisis strategies with longer-term development strategies; as threats emanating from FCAS increasingly affect countries beyond those states and regions e.g. through serious and organised crime (SOC) networks, migration, terrorism, etc; and as global trends like climate change and demographic shifts create new stresses, opportunities, and risks.
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Osadchyi, Viacheslav V., Hanna B. Varina, Kateryna P. Osadcha, Olha V. Kovalova, Valentyna V. Voloshyna, Oleksii V. Sysoiev, and Mariya P. Shyshkina. The use of augmented reality technologies in the development of emotional intelligence of future specialists of socionomic professions under the conditions of adaptive learning. CEUR Workshop Proceedings, July 2020. http://dx.doi.org/10.31812/123456789/4633.
Повний текст джерелаАнотація:
In modern conditions, innovative augmented reality technologies are actively developing, which are widespread in many areas of human activity. Introduction of advanced developments in the process of professional training of future specialists of socionomic professions in the conditions of adaptive training, contributes to the implementation of the principles of a personalized approach and increase the overall level of competitiveness. The relevant scientific article is devoted to the theoretical and empirical analysis result of conducting a psychodiagnostic study on an innovative computer complex HC-psychotest. of the features of the implementation of augmented reality technologies in the construct of traditional psychological and pedagogical support aimed at the development of emotional intelligence of the future specialist. The interdisciplinary approach was used while carrying out the research work at the expense of the general fund of the state budget: “Adaptive system for individualization and personalization of professional training of future specialists in the conditions of blended learning”. A comprehensive study of the implementation of traditional psychological-pedagogical and innovative augmented reality technologies was conducted in the framework of scientific cooperation of STEAM-Laboratory, Laboratory of Psychophysiological Research and Laboratory of Psychology of Health in Bogdan Khmelnitsky Melitopol State Pedagogical University. The theoretical analysis considers the structural model of emotional intelligence of the future specialist of socionomic professions, which is represented by two structural components: intrapersonal construct of emotional intelligence and interpersonal construct of emotional intelligence. Each component mediates the inherent emotional intelligence of interpretive, regulatory, adaptive, stress-protective and activating functions. The algorithm of the empirical block of research is presented by two stages: ascertaining and forming research. According to the results of the statement, low indicators were found on most scales, reflecting the general level of emotional intelligence development of future specialists, actualizing the need to find and implement effective measures for the development of emotional intelligence components in modern higher education and taking into account information development and digitalization. As part of the formative stage of the research implementation, a comprehensive program “Development of emotional intelligence of future professionals” was tested, which integrated traditional psychological and pedagogical technologies and innovative augmented reality technologies. This program is designed for 24 hours, 6 thematic classes of 4 hours. According to the results of a comprehensive ascertaining and shaping research, the effectiveness of the influence of augmented reality technologies on the general index of emotional intelligence is proved. The step-by-step model of integration of augmented reality components influencing the ability to analyze, understand and regulate emotional states into a complex program of emotional intelligence development is demonstrated. According to the results of the formative study, there is a dominance of high indicators of the following components: intrapersonal (50%), interpersonal (53.3%). Thus, we can say that intrapersonal and interpersonal emotional intelligence together involve the actualization of various cognitive processes and skills, and are related to each other. Empirical data were obtained as a
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Shomer, Ilan, Ruth E. Stark, Victor Gaba, and James D. Batteas. Understanding the hardening syndrome of potato (Solanum tuberosum L.) tuber tissue to eliminate textural defects in fresh and fresh-peeled/cut products. United States Department of Agriculture, November 2002. http://dx.doi.org/10.32747/2002.7587238.bard.
Повний текст джерелаАнотація:
The project sought to understand factors and mechanisms involved in the hardening of potato tubers. This syndrome inhibits heat softening due to intercellular adhesion (ICA) strengthening, compromising the marketing of industrially processed potatoes, particularly fresh peeled-cut or frozen tubers. However, ICA strengthening occurs under conditions which are inconsistent with the current ideas that relate it to Ca-pectate following pectin methyl esterase (PME) activity or to formation of rhamnogalacturonan (RG)-II-borate. First, it was necessary to induce strengthening of the middle lamellar complex (MLX) and the ICA as a stress response in some plant parenchyma. As normally this syndrome does not occur uniformly enough to study it, we devised an efficient model in which ICA-strengthening is induced consistently under simulated stress by short-chain, linear, mono-carboxylic acid molecules (OAM), at 65 oC [appendix 1 (Shomer&Kaaber, 2006)]. This rapid strengthening was insufficient for allowing the involved agents assembly to be identifiable; but it enabled us to develop an efficient in vitro system on potato tuber parenchyma slices at 25 ºC for 7 days, whereas unified stress was reliably simulated by OAMs in all the tissue cells. Such consistent ICA-strengthening in vitro was found to be induced according to the unique physicochemical features of each OAM as related to its lipophilicity (Ko/w), pKa, protonated proportion, and carbon chain length by the following parameters: OAM dissociation constant (Kdiss), adsorption affinity constant (KA), number of adsorbed OAMs required for ICA response (cooperativity factor) and the water-induced ICA (ICAwater). Notably, ICA-strengthening is accompanied by cell sap leakage, reflecting cell membrane rupture. In vitro, stress simulation by OAMs at pH<pKa facilitated the consistent assembly of ICAstrengthening agents, which we were able to characterize for the first time at the molecular level within purified insoluble cell wall of ICA-strengthened tissue. (a) With solid-state NMR, we established the chemical structure and covalent binding to cell walls of suberin-like agents associated exclusively with ICA strengthening [appendix 3 (Yu et al., 2006)]; (b) Using proteomics, 8 isoforms of cell wall-bound patatin (a soluble vacuolar 42-kDa protein) were identified exclusively in ICA-strengthened tissue; (c) With light/electron microscopy, ultrastructural characterization, histochemistry and immunolabeling, we co-localized patatin and pectin in the primary cell wall and prominently in the MLX; (d) determination of cell wall composition (pectin, neutral sugars, Ca-pectate) yielded similar results in both controls and ICA-strengthened tissue, implicating factors other than PME activity, Ca2+ or borate ions; (e) X-ray powder diffraction experiments revealed that the cellulose crystallinity in the cell wall is masked by pectin and neutral sugars (mainly galactan), whereas heat or enzymatic pectin degradation exposed the crystalline cellulose structure. Thus, we found that exclusively in ICA-strengthened tissue, heat-resistant pectin is evident in the presence of patatin and suberinlike agents, where the cellulose crystallinity was more hidden than in fresh control tissue. Conclusions: Stress response ICA-strengthening is simulated consistently by OAMs at pH< pKa, although PME and formation of Ca-pectate and RG-II-borate are inhibited. By contrast, at pH>pKa and particularly at pH 7, ICA-strengthening is mostly inhibited, although PME activity and formation of Ca-pectate or RG-II-borate are known to be facilitated. We found that upon stress, vacuolar patatin is released with cell sap leakage, allowing the patatin to associate with the pectin in both the primary cell wall and the MLX. The stress response also includes formation of covalently bound suberin-like polyesters within the insoluble cell wall. The experiments validated the hypotheses, thus led to a novel picture of the structural and molecular alterations responsible for the textural behavior of potato tuber. These findings represent a breakthrough towards understanding of the hardening syndrome, laying the groundwork for potato-handling strategies that assure textural quality of industrially processed particularly in fresh peeled cut tubers, ready-to-prepare and frozen preserved products.
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Cooper, Christopher, Jacob McDonald, and Eric Starkey. Wadeable stream habitat monitoring at Congaree National Park: 2018 baseline report. National Park Service, June 2021. http://dx.doi.org/10.36967/nrr-2286621.
Повний текст джерелаАнотація:
The Southeast Coast Network (SECN) Wadeable Stream Habitat Monitoring Protocol collects data to give park resource managers insight into the status of and trends in stream and near-channel habitat conditions (McDonald et al. 2018a). Wadeable stream monitoring is currently implemented at the five SECN inland parks with wadeable streams. These parks include Horseshoe Bend National Military Park (HOBE), Kennesaw Mountain National Battlefield Park (KEMO), Ocmulgee Mounds National Historical Park (OCMU), Chattahoochee River National Recreation Area (CHAT), and Congaree National Park (CONG). Streams at Congaree National Park chosen for monitoring were specifically targeted for management interest (e.g., upstream development and land use change, visitor use of streams as canoe trails, and potential social walking trail erosion) or to provide a context for similar-sized stream(s) within the park or network (McDonald and Starkey 2018a). The objectives of the SECN wadeable stream habitat monitoring protocol are to: Determine status of upstream watershed characteristics (basin morphology) and trends in land cover that may affect stream habitat, Determine the status of and trends in benthic and near-channel habitat in selected wadeable stream reaches (e.g., bed sediment, geomorphic channel units, and large woody debris), Determine the status of and trends in cross-sectional morphology, longitudinal gradient, and sinuosity of selected wadeable stream reaches. Between June 11 and 14, 2018, data were collected at Congaree National Park to characterize the in-stream and near-channel habitat within stream reaches on Cedar Creek (CONG001, CONG002, and CONG003) and McKenzie Creek (CONG004). These data, along with the analysis of remotely sensed geographic information system (GIS) data, are presented in this report to describe and compare the watershed-, reach-, and transect-scale characteristics of these four stream reaches to each other and to selected similar-sized stream reaches at Ocmulgee Mounds National Historical Park, Kennesaw Mountain National Battlefield Park, and Chattahoochee National Recreation Area. Surveyed stream reaches at Congaree NP were compared to those previously surveyed in other parks in order to provide regional context and aid in interpretation of results. edar Creek’s watershed (CONG001, CONG002, and CONG003) drains nearly 200 square kilometers (77.22 square miles [mi2]) of the Congaree River Valley Terrace complex and upper Coastal Plain to the north of the park (Shelley 2007a, 2007b). Cedar Creek’s watershed has low slope and is covered mainly by forests and grasslands. Cedar Creek is designated an “Outstanding Resource Water” by the state of South Carolina (S.C. Code Regs. 61–68 [2014] and S.C. Code Regs. 61–69 [2012]) from the boundary of the park downstream to Wise Lake. Cedar Creek ‘upstream’ (CONG001) is located just downstream (south) of the park’s Bannister Bridge canoe landing, which is located off Old Bluff Road and south of the confluence with Meyers Creek. Cedar Creek ‘middle’ and Cedar Creek ‘downstream’ (CONG002 and CONG003, respectively) are located downstream of Cedar Creek ‘upstream’ where Cedar Creek flows into the relatively flat backswamp of the Congaree River flood plain. Based on the geomorphic and land cover characteristics of the watershed, monitored reaches on Cedar Creek are likely to flood often and drain slowly. Flooding is more likely at Cedar Creek ‘middle’ and Cedar Creek ‘downstream’ than at Cedar Creek ‘upstream.’ This is due to the higher (relative to CONG001) connectivity between the channels of the lower reaches and their out-of-channel areas. Based on bed sediment characteristics, the heterogeneity of geomorphic channel units (GCUs) within each reach, and the abundance of large woody debris (LWD), in-stream habitat within each of the surveyed reaches on Cedar Creek (CONG001–003) was classified as ‘fair to good.’ Although, there is extensive evidence of animal activity...
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Osadchyi, Viacheslav, Hanna Varina, Evgeniy Prokofiev, Iryna Serdiuk, and Svetlana Shevchenko. Use of AR/VR Technologies in the Development of Future Specialists' Stress Resistance: Experience of STEAM-Laboratory and Laboratory of Psychophysiological Research Cooperation. [б. в.], November 2020. http://dx.doi.org/10.31812/123456789/4455.
Повний текст джерелаАнотація:
The scientific article deals with the analysis of peculiarities of the use of innovative AR/VR technologies in the process of developing future special- ists’ stress resistance. Based on the analysis of the introduction of AR/VR tech- nologies in the context of the implementation of a competency-based approach to higher education; modern studies on the impact of augmented reality on the emotional states and physiological features of a person in a stressful situation, the experience of cooperation of students and teachers at the Laboratory of Psy- chophysiological Research and STEAM-Laboratory has been described. Within the framework of the corresponding concept of cooperation, an integrative ap- proach to the process of personality’s stress resistance development has been designed and implemented. It is based on the complex combination of tradition- al psycho-diagnostic and training technologies with innovative AR/VR technol- ogies. According to the results it has been revealed that the implementation of a psycho-correction program with elements of AR technologies has promoted an increase of the level of personality’s emotional stability and stress resistance. The level of future specialists’ situational and personal anxiety has decreased; the level of insecurity, inferiority, anxiety about work, sensitivity to failures has also decreased; the level of flexibility of thinking and behavior, ability to switch from one type of activity to another one has increased; general level of person- ality’s adaptive abilities has also increased. The perspectives of further research include the analysis of the impact of AR/VR technologies on the future profes- sionals’ psychological characteristics in order to optimize the process of im- plementing a learner-centered approach into the system of higher education.
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Davies, Will. Improving the engagement of UK armed forces overseas. Royal Institute of International Affairs, January 2022. http://dx.doi.org/10.55317/9781784135010.
Повний текст джерелаАнотація:
The UK government’s Integrated Review of security, defence, development and foreign policy, published in March 2021 alongside a supporting defence command paper, set a new course for UK national security and highlighted opportunities for an innovative approach to international engagement activity. The Integrated Review focused principally on the state threats posed by China’s increasing power and by competitors – including Russia – armed with nuclear, conventional and hybrid capabilities. It also stressed the continuing risks to global security and resilience due to conflict and instability in weakened and failed states. These threats have the potential to increase poverty and inequality, violent extremism, climate degradation and the forced displacement of people, while presenting authoritarian competitors with opportunities to enhance their geopolitical influence. There are moral, security and economic motives to foster durable peace in conflict-prone and weakened regions through a peacebuilding approach that promotes good governance, addresses the root causes of conflict and prevents violence, while denying opportunities to state competitors. The recent withdrawal from Afghanistan serves to emphasize the complexities and potential pitfalls associated with intervention operations in complex, unstable regions. Success in the future will require the full, sustained and coordinated integration of national, allied and regional levers of power underpinned by a sophisticated understanding of the operating environment. The UK armed forces, with their considerable resources and global network, will contribute to this effort through ‘persistent engagement’. This is a new approach to overseas operations below the threshold of conflict, designed as a pre-emptive complement to warfighting. To achieve this, the UK Ministry of Defence (MOD) must develop a capability that can operate effectively in weak, unstable and complex regions prone to violent conflict and crises, not least in the regions on the eastern and southern flanks of the Euro-Atlantic area. The first step must be the development of a cohort of military personnel with enhanced, tailored levels of knowledge, skills and experience. Engagement roles must be filled by operators with specialist knowledge, skills and experience forged beyond the mainstream discipline of combat and warfighting. Only then will individuals develop a genuinely sophisticated understanding of complex, politically driven and sensitive operating environments and be able to infuse the design and delivery of international activities with practical wisdom and insight. Engagement personnel need to be equipped with: An inherent understanding of the human and political dimensions of conflict, the underlying drivers such as inequality and scarcity, and the exacerbating factors such as climate change and migration; - A grounding in social sciences and conflict modelling in order to understand complex human terrain; - Regional expertise enabled by language skills, cultural intelligence and human networks; - Familiarity with a diverse range of partners, allies and local actors and their approaches; - Expertise in building partner capacity and applying defence capabilities to deliver stability and peace; - A grasp of emerging artificial intelligence technology as a tool to understand human terrain; - Reach and insight developed through ‘knowledge networks’ of external experts in academia, think-tanks and NGOs. Successful change will be dependent on strong and overt advocacy by the MOD’s senior leadership and a revised set of personnel policies and procedures for this cohort’s selection, education, training, career management, incentivization, sustainability and support.
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Chamovitz, Daniel, and Albrecht Von Arnim. Translational regulation and light signal transduction in plants: the link between eIF3 and the COP9 signalosome. United States Department of Agriculture, November 2006. http://dx.doi.org/10.32747/2006.7696515.bard.
Повний текст джерелаАнотація:
The COP9 signalosome (CSN) is an eight-subunit protein complex that is highly conserved among eukaryotes. Genetic analysis of the signalosome in the plant model species Arabidopsis thaliana has shown that the signalosome is a repressor of light dependent seedling development as mutant Arabidopsis seedlings that lack this complex develop in complete darkness as if exposed to light. These mutant plants die following the seedling stage, even when exposed to light, indicating that the COP9 signalosome also has a central role in the regulation of normal photomorphogenic development. The biochemical mode of action of the signalosome and its position in eukaryotic cell signaling pathways is a matter of controversy and ongoing investigation, and recent results place the CSN at the juncture of kinase signaling pathways and ubiquitin-mediated protein degradation. We have shown that one of the many CSN functions may relate to the regulation of translation through the interaction of the CSN with its related complex, eukaryotic initiation factor (eIF3). While we have established a physical connection between eIF3 subunits and CSN subunits, the physiological and developmental significance of this interaction is still unknown. In an effort to understand the biochemical activity of the signalosome, and its role in regulating translation, we originally proposed to dissect the contribution of "h" subunit of eIF3 (eIF3h) along the following specific aims: (i) Isolation and phenotypic characterization of an Arabidopsis loss-of-function allele for eIF3h from insertional mutagenesis libraries; (ii) Creation of designed gain and loss of function alleles for eIF3h on the basis of its nucleocytoplasmic distribution and its yeast-two-hybrid interactions with other eIF3 and signalosome partner proteins; (iii) Determining the contribution of eIF3h and its interaction with the signalosome by expressing specific mutants of eIF3h in the eIF3h- loss-of function background. During the course of the research, these goals were modified to include examining the genetic interaction between csn and eif3h mutations. More importantly, we extended our effort toward the genetic analysis of mutations in the eIF3e subunit, which also interacts with the CSN. Through the course of this research program we have made several critical scientific discoveries, all concerned with the apparent diametrically opposed roles of eIF3h and eIF3e. We showed that: 1) While eIF3e is essential for growth and development, eIF3h is not essential for growth or basal translation; 2) While eIF3e has a negative role in translational regulation, eIF3h is positively required for efficient translation of transcripts with complex 5' UTR sequences; 3) Over-accumulation of eIF3e and loss-of-function of eIF3h both lead to cop phenotypes in dark-grown seedlings. These results were published in one publication (Kim et al., Plant Cell 2004) and in a second manuscript currently in revision for Embo J. Are results have led to a paradigm shift in translation research – eIF3 is now viewed in all systems as a dynamic entity that contains regulatory subuits that affect translational efficiency. In the long-term agronomic outlook, the proposed research has implications that may be far reaching. Many important plant processes, including developmental and physiological responses to light, abiotic stress, photosynthate, and hormones operate in part by modulating protein translation [23, 24, 40, 75]. Translational regulation is slowly coming of age as a mechanism for regulating foreign gene expression in plants, beginning with translational enhancers [84, 85] and more recently, coordinating the expression of multiple transgenes using internal ribosome entry sites. Our contribution to understanding the molecular mode of action of a protein complex as fundamental as eIF3 is likely to lead to advances that will be applicable in the foreseeable future.
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Elbaum, Michael, and Peter J. Christie. Type IV Secretion System of Agrobacterium tumefaciens: Components and Structures. United States Department of Agriculture, March 2013. http://dx.doi.org/10.32747/2013.7699848.bard.
Повний текст джерелаАнотація:
Objectives: The overall goal of the project was to build an ultrastructural model of the Agrobacterium tumefaciens type IV secretion system (T4SS) based on electron microscopy, genetics, and immunolocalization of its components. There were four original aims: Aim 1: Define the contributions of contact-dependent and -independent plant signals to formation of novel morphological changes at the A. tumefaciens polar membrane. Aim 2: Genetic basis for morphological changes at the A. tumefaciens polar membrane. Aim 3: Immuno-localization of VirB proteins Aim 4: Structural definition of the substrate translocation route. There were no major revisions to the aims, and the work focused on the above questions. Background: Agrobacterium presents a unique example of inter-kingdom gene transfer. The process involves cell to cell transfer of both protein and DNA substrates via a contact-dependent mechanism akin to bacterial conjugation. Transfer is mediated by a T4SS. Intensive study of the Agrobacterium T4SS has made it an archetypal model for the genetics and biochemistry. The channel is assembled from eleven protein components encoded on the B operon in the virulence region of the tumor-inducing plasmid, plus an additional coupling protein, VirD4. During the course of our project two structural studies were published presenting X-ray crystallography and three-dimensional reconstruction from electron microscopy of a core complex of the channel assembled in vitro from homologous proteins of E. coli, representing VirB7, VirB9, and VirB10. Another study was published claiming that the secretion channels in Agrobacterium appear on helical arrays around the membrane perimeter and along the entire length of the bacterium. Helical arrangements in bacterial membranes have since fallen from favor however, and that finding was partially retracted in a second publication. Overall, the localization of the T4SS within the bacterial membranes remains enigmatic in the literature, and we believe that our results from this project make a significant advance. Summary of achievements : We found that polar inflations and other membrane disturbances relate to the activation conditions rather than to virulence protein expression. Activation requires low pH and nutrient-poor medium. These stress conditions are also reflected in DNA condensation to varying degrees. Nonetheless, they must be considered in modeling the T4SS as they represent the relevant conditions for its expression and activity. We identified the T4SS core component VirB7 at native expression levels using state of the art super-resolution light microscopy. This marker of the secretion system was found almost exclusively at the cell poles, and typically one pole. Immuno-electron microscopy identified the protein at the inner membrane, rather than at bridges across the inner and outer membranes. This suggests a rare or transient assembly of the secretion-competent channel, or alternatively a two-step secretion involving an intermediate step in the periplasmic space. We followed the expression of the major secreted effector, VirE2. This is a single-stranded DNA binding protein that forms a capsid around the transferred oligonucleotide, adapting the bacterial conjugation to the eukaryotic host. We found that over-expressed VirE2 forms filamentous complexes in the bacterial cytoplasm that could be observed both by conventional fluorescence microscopy and by correlative electron cryo-tomography. Using a non-retentive mutant we observed secretion of VirE2 from bacterial poles. We labeled the secreted substrates in vivo in order detect their secretion and appearance in the plant cells. However the low transfer efficiency and significant background signal have so far hampered this approach.
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Albright, Jeff, Kim Struthers, Lisa Baril, John Spence, Mark Brunson, and Ken Hyde. Natural resource conditions at Glen Canyon National Recreation Area: Findings & management considerations for selected resources. National Park Service, April 2022. http://dx.doi.org/10.36967/nrr-2293112.
Повний текст джерелаАнотація:
Glen Canyon National Recreation Area (GLCA) encompasses more than 0.5 million ha (1.25 million ac) and extends over 322 km (200 mi) from its northern boundary in southern Utah to its southern boundary in northern Arizona. It is one of the most rugged, remote, and floristically diverse national parks on the Southern Colorado Plateau (Thomas et. al 2005) and has more than 4,900 km (3,045 mi) of waterways flowing through its eight Hydrologic Unit Code (HUC 8) watersheds. GLCA’s larger perennial rivers include the Colorado, Escalante, Dirty Devil, San Juan, and Paria, with smaller perennial and intermittent streams flowing into each of these rivers. After the creation of the Glen Canyon Dam, Lake Powell formed, covering 13% of the park’s total land area when full and the national recreation area attracts over 4 million visitors annually, and in 2019 GLCA ranked 19th highest in recreational visits out of all national parks. The National Park Service Natural Resource Condition Assessment Program selected GLCA to pilot its new NRCA project series. NRCA projects evaluate the best available science to provide park managers with reliable, actionable information pertaining to natural resource conditions in their park. For the park-selected focal study resources, this includes consideration of drivers and stressors known or suspected of influencing resource conditions; assessment of current conditions and trends for indicators of condition; and potential near-term and future activities or actions managers can consider, improving their knowledge and management of natural resources in parks. For focal resources that lack adequate data to assess current conditions, a gap analysis is provided (in lieu of a condition assessment) to highlight the present status of knowledge of the resource and to suggest useful indicators, data, and studies for further consideration and investigation. Park managers are encouraged to identify information needs and pose questions during the NRCA scoping process, with the understanding that information will be provided to help address those needs and answer those questions when possible. For a comprehensive list of GLCA managers’ questions and needs, please refer to Appendix A, Table A-1. The focus of GLCA’s NRCA study was the water-dependent resources—tinajas, springs & seeps, including water quality, riparian zone, amphibians, including the northern leopard frog (Lithobates pipiens), and small, native fishes—that are found off the mainstem Colorado River. Managers were interested in these particular environments and the natural resources that depend on them because they are less studied, and the habitats are “biodiversity hotspots” due to the intersection of complex desert and freshwater ecosystems in a region limited by water. The following summaries highlight the key findings of GLCA’s focal resource drivers and stressors (Chapter 2), states (Chapter 3), and manager responses (Chapter 4).