Relevant bibliographies by topics / Impact of blocks

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Impact of blocks'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Impact of blocks"

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Narinesingh, Veeshan, James F. Booth, Spencer K. Clark, and Yi Ming. "Atmospheric blocking in an aquaplanet and the impact of orography." Weather and Climate Dynamics 1, no. 2 (July 8, 2020): 293–311. http://dx.doi.org/10.5194/wcd-1-293-2020.

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Abstract. Many fundamental questions remain about the roles and effects of stationary forcing on atmospheric blocking. As such, this work utilizes an idealized moist general circulation model (GCM) to investigate atmospheric blocking in terms of dynamics, geographical location, and duration. The model is first configured as an aquaplanet, then orography is added in separate integrations. Block-centered composites of wave activity fluxes and height show that blocks in the aquaplanet undergo a realistic dynamical evolution when compared to reanalysis. Blocks in the aquaplanet are also found to have similar life cycles to blocks in model integrations with orography. These results affirm the usefulness of both zonally symmetric and asymmetric idealized model configurations for studying blocking. Adding orography to the model leads to an increase in blocking. This mirrors what is observed when comparing the Northern Hemisphere (NH) and Southern Hemisphere (SH), where the NH contains more orography and thus more blocking. As the prescribed mountain height increases, so do the magnitude and size of climatological stationary waves, resulting in more blocking overall. Increases in blocking, however, are not spatially uniform. Orography is found to induce regions of enhanced block frequency just upstream of mountains, near high pressure anomalies in the stationary waves, which is poleward of climatological minima in upper-level zonal wind, while block frequency minima and jet maxima occur eastward of the wave trough. This result matches what is observed near the Rocky Mountains. Finally, an analysis of block duration suggests blocks generated near stationary wave maxima last slightly longer than blocks that form far from or without orography. Overall, the results of this work help to explain some of the observed similarities and differences in blocking between the NH and SH and emphasize the importance of general circulation features in setting where blocks most frequently occur.
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Yang, Yunzi, Yuanyuan Ma, and Hongzan Jiao. "Exploring the Correlation between Block Vitality and Block Environment Based on Multisource Big Data: Taking Wuhan City as an Example." Land 10, no. 9 (September 17, 2021): 984. http://dx.doi.org/10.3390/land10090984.

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Block is the basic unit for studying the urban activities of residents, and block vitality is the concrete expression of urban dynamics at the block level. The quality of the block’s residential environment is a crucial medium to satisfy the residents’ pursuit of high-quality life; good block quality is essential for fostering the block vitality and further enhancing the overall vitality of the city. This study used the distribution density of cellular signaling data to quantify block vitality and constructed a block environment index system covering four dimensions—block accessibility, block function, block development degree, and human perception of block environment—innovatively introducing the elements of block environment from the human perspective. Considering the variability of block vitality between workdays and weekends, and between downtown and suburban blocks, this study used a geographically weighted regression model to show the mechanism of the spatial and temporal influence of indicators on block vitality, as well as to suggest how to enhance block vitality at different times of the day based on the influence mechanism. This study was conducted in Wuhan, China. The findings suggest that block vitality exhibited significant spatial and temporal heterogeneity. A high-vitality block can be created by enhancing the block’s accessibility, increasing the degree of block construction, and enriching the functional density and mix of functions in the block. A pleasantly green environment with a moderate degree of openness exerted a significant impact on promoting human activity and enhancing block vitality. The creation of high-vitality blocks should also consider the differences in the impact of various elements on block vitality between weekend and workday. For example, amid the surge in travel demand for education venues on weekends, enhancing the accessibility of blocks can significantly increase the vitality of blocks on weekends. We can truly realize the people-oriented approach to build a livable and high-vitality city by adapting to local conditions and time.
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Wang, X., C. S. Chin, and J. Xia. "Impact of the Content Variation of the Different Recycled Wastes to the Properties of Concrete Paving Block." MATEC Web of Conferences 206 (2018): 02004. http://dx.doi.org/10.1051/matecconf/201820602004.

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Recycled concrete aggregates have been widely studied and used in concrete products nowadays. However, other recycled wastes, such as glass, have not been involved too much in recycled aggregate concrete studies. This paper aims to study the impact of the content variation of the different recycled wastes to the properties of the concrete paving block. In this paper, not only recycled coarse concrete aggregates, crushed glass are also used as the recycled aggregate in the concrete paving block in different replacement levels. According to test the properties of blocks mixed with different recycled wastes, the experimental results indicate that: (1) adding recycled concrete coarse aggregate (RCCA) in the blocks can decrease the blocks’ strength, and increase the water absorption. The suggested replacement levels for RCCA is 60%; (2) mixing crushed glass (CG) in the concrete paving blocks as a type of coarse aggregates can obviously improve the blocks’ strength and decrease the blocks’ water absorption.
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Zhukov, I. A., and V. V. Molchanov. "Rational Designing Two-Stage Anvil Block of Impact Mechanisms." Advanced Materials Research 1040 (September 2014): 699–702. http://dx.doi.org/10.4028/www.scientific.net/amr.1040.699.

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In the article the solution of the problem of heightening of efficiency of impact systems for the score of selection of rational shapes anvil blocks is reduced. Shape execution of anvil block in the form of two steps is offered - impact and cylindrical piston, which length steal up by "golden section" rule. Results of a finding of shapes of the impact impulses generated at direct blow on rods two-stage anvil blocks are reduced and analyzed.
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Hibert, Clément, Jean-Philippe Malet, Franck Bourrier, Floriane Provost, Frédéric Berger, Pierrick Bornemann, Pascal Tardif, and Eric Mermin. "Single-block rockfall dynamics inferred from seismic signal analysis." Earth Surface Dynamics 5, no. 2 (May 23, 2017): 283–92. http://dx.doi.org/10.5194/esurf-5-283-2017.

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Abstract. Seismic monitoring of mass movements can significantly help to mitigate the associated hazards; however, the link between event dynamics and the seismic signals generated is not completely understood. To better understand these relationships, we conducted controlled releases of single blocks within a soft-rock (black marls) gully of the Rioux-Bourdoux torrent (French Alps). A total of 28 blocks, with masses ranging from 76 to 472 kg, were used for the experiment. An instrumentation combining video cameras and seismometers was deployed along the travelled path. The video cameras allow reconstructing the trajectories of the blocks and estimating their velocities at the time of the different impacts with the slope. These data are compared to the recorded seismic signals. As the distance between the falling block and the seismic sensors at the time of each impact is known, we were able to determine the associated seismic signal amplitude corrected for propagation and attenuation effects. We compared the velocity, the potential energy lost, the kinetic energy and the momentum of the block at each impact to the true amplitude and the radiated seismic energy. Our results suggest that the amplitude of the seismic signal is correlated to the momentum of the block at the impact. We also found relationships between the potential energy lost, the kinetic energy and the seismic energy radiated by the impacts. Thanks to these relationships, we were able to retrieve the mass and the velocity before impact of each block directly from the seismic signal. Despite high uncertainties, the values found are close to the true values of the masses and the velocities of the blocks. These relationships allow for gaining a better understanding of the physical processes that control the source of high-frequency seismic signals generated by rockfalls.
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Eller, Benjamin, and Jean-François Hetet. "Impact of Mounting Blocks on Drivability." IEEE Vehicular Technology Magazine 6, no. 3 (September 2011): 27–33. http://dx.doi.org/10.1109/mvt.2011.941899.

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LUPO, C., S. BOUGEARD, L. BALAINE, V. MICHEL, I. PETETIN, P. COLIN, S. LeBOUQUIN, and C. CHAUVIN. "Risk factors for sanitary condemnation in broiler chickens and their relative impact: application of an original multiblock approach." Epidemiology and Infection 138, no. 3 (August 24, 2009): 364–75. http://dx.doi.org/10.1017/s0950268809990549.

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SUMMARYAn innovative and well-adapted statistical method, called multiblock redundancy analysis, is proposed for a complex health-event analysis to account for the thematic block organization of variables. The outcome block contained the condemnation rates of 404 broiler chicken flocks, distinguishing infectious and traumatic condemnation categories. Explanatory variables were organized in blocks related to the different production stages (farm structure and routine husbandry practices; on-farm flock history and characteristics; catching, transport and lairage conditions; slaughterhouse and inspection features). The aim was to determine risk factors for both condemnation categories, and the relative impact of the different production stages on the whole condemnation rate. Results showed that significant factors were either specific to one condemnation category or related to both categories, and each of the explanatory blocks was involved in the explanation of infectious and traumatic condemnation rates. On-farm flock information explained 40% of the overall condemnation process whereas the other explanatory blocks had similar relative impacts.
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Wang, Guoshun, and Rong Fu. "Impact of Brake Pad Structure on Temperature and Stress Fields of Brake Disc." Advances in Materials Science and Engineering 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/872972.

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Utilizing ABAQUS finite element software, the study established the relationship between a brake pad structure and distributions of temperature and thermal stress on brake disc. By introducing radial structure factor and circular structure factor concepts, the research characterized the effect of friction block radial and circumferential arrangement on temperature field of the brake disc. A method was proposed for improving heat flow distribution of the brake disc through optimizing the position of the friction block of the brake pad. Structure optimization was conducted on brake pads composed of 5 or 7 circular friction blocks. The result shows that, with the same overall contact area of friction pair, an appropriate brake pad structure can make the friction energy distribute evenly and therefore lowers peak temperature and stress of the brake disc. Compared with a brake pad of 7 friction blocks, an optimized brake pad of 5 friction blocks lowered the peak temperature of the corresponding brake disc by 4.9% and reduced the highest stress by 10.7%.
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Shinozuka, J., and Toshiyuki Obikawa. "Development of Orthogonal Impact Cutting Testing Machine." Key Engineering Materials 291-292 (August 2005): 507–12. http://dx.doi.org/10.4028/www.scientific.net/kem.291-292.507.

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FEM cutting simulation predicts that the plastic shock waves are generated that develop the high levels of hydrostatic stress in the shear zone when cutting speed exceeds the plastic wave speeds of the workpiece material. The orthogonal impact cutting testing machine was developed to confirm this phenomenon experimentally. In the testing machine, two guide rails are set up in parallel. The cutting tool and the workpiece are installed on the blocks that slide on the rail. Each block connected with the piston in the air tube by the pushrod is launched by the expansion of compressed air, and is accelerated rapidly. When the two blocks passes each other, cutting is done. This paper describes the details of the developed impact cutting testing machine and experimental results of cutting a pure lead at cutting speed up to 65m/s.
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Taenzer, Andreas H., Brian D. Sites, Roman Kluger, and Michael Barrington. "Settled science or unwarranted variation in local anesthetic dosing? An analysis from an International Registry of Regional Anesthesiology." Regional Anesthesia & Pain Medicine 44, no. 11 (September 6, 2019): 998–1002. http://dx.doi.org/10.1136/rapm-2019-100650.

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BackgroundVariation in clinical practice is often considered unwarranted when it does not reflect patient preference or evidence-based medicine. Complications from regional anesthesia such as nerve injury and systemic toxicity are dose dependent. It is currently unclear if there is significant variation with the dosing of local anesthetics (LA) in the context of the modern practice of peripheral regional anesthesia.MethodsWe analyzed data from the International Registry of Regional Anesthesia that include prospective data on peripheral regional anesthesia procedures from 21 centers located around the world. Using data from years 2011 to 2017, our primary aim was to characterize the degree of variation in dosing of LA for the top 10 most commonly performed single injection peripheral nerve blocks. Our secondary aim was to identify potential drivers of this variation.ResultsAmong the 26 457 peripheral blocks performed, mean (±SD) LA dose per block in ropivacaine equivalents was 125.1±51.2 mg and 1.6±0.7 for mg/kg. There was large variation across all block types, with the highest variation (measured by interdecile range) in axillary blocks (143.8 mg) and lowest in interscalene blocks (83.3 mg). In a regression analysis, dose was primarily associated with the hospital (Cohen’s f=0.37) where the block was administered and block type (f=0.38), less so with age (f=0.02), weight (f=0.12), gender (f=0.05) or LA (f=0.17) used. Hospital site had strong impact on variation in LA dose (f=0.88). Variation was not significantly associated with number of blocks performed by hospital site.ConclusionsLarge variation in dosing for regional blocks exists within and among hospitals, which is unlikely to be warranted. For many blocks, the variation of dosing is larger than the mean dose. Hospital site had strong impact on variation in LA dose and moderate impact on mean LA dose.
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Dissertations / Theses on the topic "Impact of blocks"

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Ciccone, Giuseppina. "Experimental study of artificial blocks under dynamic fragmentation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Rockfall represents a significant hazard not only in mountainous areas, but also alongside coastal routes, major transport infrastructures and quarry faces. One aspect of the rockfall phenomenon that still requires further investigations is the fragmentation of falling blocks upon impact. The changes in size, shape and energy of the falling blocks upon fragmentation and the variation in trajectory of the fragments can seriously affect the optimization design of the rockfall mitigation measures. The fragmentation of boulders during a rockfall event can lead to significant changes in the global run-out distances and the maximum kinetic energy to be accounted in the protection systems design. This thesis presents an experimental program conducted to investigate the fragmentation phenomenon under controlled conditions to provide some useful insights in terms of block survival probability upon dynamic impact, fragments distribution, post impact velocity and energy dissipation upon impact. The result of this thesis will focus on a detailed description of the fragmentation process and study several fragmentation mechanisms involved, reproducing many experimental observations of fragment shapes and impact energy, and significantly improve the understanding of the fragmentation process for impact fracture. Spheres shapes were chosen because of their simple body geometry and consequent impact and stress field symmetry. So, the description of materials, sample preparation and tests program conducted for 175 mortar spheres of different diameter built for the current research will be presented to evaluate the survival probability of homogeneous artificial rocks with a known compressive strength dropped from a certain height and to observe the fragmentation process upon impact with a known impacting energy.
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Narwani, Tarun Jairaj. "Dynamics of protein structures and its impact on local structural behaviors." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC160/document.

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Les structures protéiques sont de nature hautement dynamique contrairement à leur représentation dans les structures cristallines. Une composante majeure de la dynamique structurelle est la flexibilité des protéines inhérentes. L'objectif principal de cette thèse est de comprendre le rôle de la dynamique inhérente dans les structures protéiques et leur propagation. La flexibilité des protéines est analysée à différents niveaux de complexité structurelle, du niveau d'organisation primaire au niveau quaternaire. Chacun des cinq premiers chapitres traite un niveau différent d'organisation structurelle locale avec le premier chapitre traitant des structures secondaires classiques tandis que le second analyse la même chose en utilisant un alphabet structurel - les blocs protéiques. Le troisième chapitre se concentre sur l'impact d'événements physiologiques spéciaux comme les modifications post-traductionnelles et le désordre sur les transitions d'ordre sur la flexibilité des protéines. Ces trois chapitres indiquent une mise en œuvre dépendante du contexte de la flexibilité structurelle dans leur environnement local. Dans les chapitres suivants, des structures plus complexes sont prises en compte. Le chapitre 4 traite de l'intégrine αIIbβ3 impliquée dans des troubles génétiques rares. L'impact des mutations pathologiques sur la flexibilité locale est étudié dans deux domaines rigides de l'intégrine αIIbβ3 ectodomaine. La flexibilité inhérente dans ces domaines est montrée pour moduler l'impact des mutations vers les boucles. Le chapitre 5 traite de la modélisation structurelle et de la dynamique d'une structure protéique plus complexe du récepteur des chimiokines des antigènes du groupe Duffy incorporé dans un système de membrane mimétique érythrocytaire. Le modèle est soutenu par l'analyse phylogénétique la plus complète sur les récepteurs de chimiokines jusqu'à ce jour, comme expliqué dans le dernier chapitre de la thèse
Protein structures are highly dynamic in nature contrary to their depiction in crystal structures. A major component of structural dynamics is the inherent protein flexibility. The prime objective of this thesis is to understand the role of the inherent dynamics in protein structures and its propagation. Protein flexibility is analyzed at various levels of structural complexity, from primary to quaternary levels of organization. Each of the first five chapters’ deal with a different level of local structural organization with first chapter dealing with classical secondary structures while the second one analysis the same using a structural alphabet - Protein Blocks. The third chapter focuses on the impact of special physiological events like post-translational modifications and disorder to order transitions on protein flexibility. These three chapters indicate towards a context dependent implementation of structural flexibility in their local environment. In subsequent chapters, more complex structures are taken under investigation. Chapter 4 deals with integrin αIIbβ3 that is involved in rare genetic disorders. Impact of the pathological mutations on the local flexibility is studied in two rigid domains of integrin αIIbβ3 ectodomain. Inherent flexibility in these domains is shown to modulate the impact of mutations towards the loops. Chapter 5 deals with the structural modelling and dynamics of a more complex protein structure of Duffy Antigen Chemokine Receptor embedded in an erythrocyte mimic membrane system. The model is supported by the most comprehensive phylogenetic analysis on chemokine receptors till date as explained in the last chapter of the thesis
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Canessi, Tomà. "Physical modelling of rock fragmentation upon impact." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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Rockfall represents a significant safety hazard in building, civil and mining environment that can cause serious injuries and fatalities and can damage structures, infrastructure and machinery. It is extremely costly to manage and public authorities need reliable tools to study and design protection structures as the performance of the existing structures are variable. Many studies and experiments have been done, but one aspect would lead to a better comprehension of the subject: the fragmentation of blocks upon impact. Rocks commonly break up upon impact but rockfall prediction models currently available mostly ignore this phenomenon, even though fragmentation changes size, shape and energy of falling blocks and can drastically change the outcome of the design of protective structure. For example, if a large rock breaks upon impact and its mass and energy are divided among fragments, a high level of energy is dissipated and ignoring fragmentation would lead on an overdesign of the protection barrier. Moreover, very fast rock fragments may rupture a rockfall protection. The project aims to overcome this limit, studying and considering fragmentation in rockfall model, allowing assessment of the hazard rising from a shattered rock. The intention is to develop a database of experimental data about fragmentation of blocks upon impact by considering the initial conditions that cause fragmentation, the fragment size and mass distribution, the partition of velocity and energy at impact and what may lead to “bullet effect” or high flying fragment. This project aims to include fragmentation in rockfall prediction causes to facilitate a better and safer mitigation of rockfall hazard. Moreover, a better knowledge will directly translate into economical and societal benefits, such as more cost effective and better user experience.
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Patto, André Luiz Duque Brunini. "Minimização de impactos ambientais com a utilização de resíduos de construção e demolição (RCD) como agregados na fabricação de concreto." Universidade de Taubaté, 2006. http://www.bdtd.unitau.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=95.

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A reciclagem de resíduos de construção e demolição (RCD) é uma prática utilizada desde a Antigüidade, quando cidades destruídas pela guerra e por catástrofes naturais eram reerguidas dos próprios escombros. Hoje, ela é utilizada em larga escala em vários países da Europa e nos EUA. No Brasil, onde a preocupação com o destino desses resíduos é bem mais recente, poucos municípios se preocupam com o gerenciamento dos RCD. Os efeitos disso são visíveis: os resíduos ainda são depositados irregularmente em terrenos baldios, vias públicas, várzeas, córregos e até mesmo em áreas de proteção ambiental, causando a proliferação de vetores nocivos à saúde, enchentes e diversos prejuízos ao meio-ambiente. Assim, este trabalho tem como objetivo propor soluções que busquem a minimização desse impacto ambiental por meio da utilização dos RCD como agregados na fabricação de blocos de concreto. Os testes em laboratório e a comparação dos resultados obtidos com os das práticas convencionais provam a viabilidade da utilização dos resíduos, tanto em termos ambientais quanto econômicos, além de garantir que o emprego dos RCD atenda a todas as normas vigentes. Com isso, reafirmou-se o compromisso com a preservação ambiental, pois a reciclagem desse tipo de entulho, além de ajudar a removê-lo da paisagem urbana, ainda gera diferenciais consideráveis em termos de economia de energia e de recursos naturais não-renováveis que seriam utilizados como matérias-primas, reduzindo a poluição do ar, da água, do solo, desafogando aterros sanitários, e visando atingir o desenvolvimento sustentável.
Recycling of construction and demolition refuses (CDR) is a has been practiced since ancient history, when cities that were destroyed by war and natural disasters were rebuilt from their own ruins. Today, it is used in large scale in many countries in Europe and in the USA. In Brazil, where the concern with the destination of this kind of refuses is much more recent, few cities have planned and executed CDR management to this day. The side effects of this situation are plainly visible: the refuses have been continually and irregularly deposed in unused areas, thoroughfares, riversides, creeks and even in environmental protection areas, causing the proliferation of health-affecting problems, flooding and many other damages to the environment. Therefore, this study has the main goal of proposing solutions that can lessen the environmental impact by using CDR as aggregate in the manufacturing of concrete blocks. The lab tests and the comparing of the results obtained with those measured with the conventional techniques prove the viability of reutilizing these refuses, both in environmental and economical terms, as well as assuring that the use of CDR follows all the current regulations. With this, the compromise with environmental preservation is reinforced, since the recycling this type of refuse, beside helping to remove it from the urban landscape, generates considerable gains in saving energy and the non-renewable natural resources that would be used as raw material, lessening air, water and soil pollution, releasing the burden on landfills, always aiming at achieving sustainable development.
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Tabouy, Timothée. "Impact de l’échantillonnage sur l’inférence de structures dans les réseaux : application aux réseaux d’échanges de graines et à l’écologie." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS289/document.

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Dans cette thèse nous nous intéressons à l’étude du modèle à bloc stochastique (SBM) en présence de données manquantes. Nous proposons une classification des données manquantes en deux catégories Missing At Random et Not Missing At Random pour les modèles à variables latentes suivant le modèle décrit par D. Rubin. De plus, nous nous sommes attachés à décrire plusieurs stratégies d’échantillonnages de réseau et leurs lois. L’inférence des modèles de SBM avec données manquantes est faite par l’intermédiaire d’une adaptation de l’algorithme EM : l’EM avec approximation variationnelle. L’identifiabilité de plusieurs des SBM avec données manquantes a pu être démontrée ainsi que la consistance et la normalité asymptotique des estimateurs du maximum de vraisemblance et des estimateurs avec approximation variationnelle dans le cas où chaque dyade (paire de nœuds) est échantillonnée indépendamment et avec même probabilité. Nous nous sommes aussi intéressés aux modèles de SBM avec covariables, à leurs inférence en présence de données manquantes et comment procéder quand les covariables ne sont pas disponibles pour conduire l’inférence. Finalement, toutes nos méthodes ont été implémenté dans un package R disponible sur le CRAN. Une documentation complète sur l’utilisation de ce package a été écrite en complément
In this thesis we are interested in studying the stochastic block model (SBM) in the presence of missing data. We propose a classification of missing data into two categories Missing At Random and Not Missing At Random for latent variable models according to the model described by D. Rubin. In addition, we have focused on describing several network sampling strategies and their distributions. The inference of SBMs with missing data is made through an adaptation of the EM algorithm : the EM with variational approximation. The identifiability of several of the SBM models with missing data has been demonstrated as well as the consistency and asymptotic normality of the maximum likelihood estimators and variational approximation estimators in the case where each dyad (pair of nodes) is sampled independently and with equal probability. We also looked at SBMs with covariates, their inference in the presence of missing data and how to proceed when covariates are not available to conduct the inference. Finally, all our methods were implemented in an R package available on the CRAN. A complete documentation on the use of this package has been written in addition
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Toe, David. "Etude de l’influence des peuplements forestiers de type taillis sur la propagation des blocs rocheux." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAU023/document.

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L'objectif principal de ce travail de thèse est d'améliorer la prise en compte des peuplements de taillis dans les logiciels d'analyse trajectographique.Dans un premier temps, un modèle numérique permettant de créer des peuplements virtuels de taillis à l'échelle du versant a été développé et validé sur la base d'inventaires forestiers réalisés dans des taillis.Deux modèles numériques permettant de simuler des impacts de blocs sur des franc pieds et des cépées ont été également développés en utilisant la Méthode des Éléments Discrets (MED).Ces modèles ont été calibrés par des essais d'impact sur des tiges de hêtre.Ils permettent d'intégrer l'influence du houppier et du système racinaire, de modéliser explicitement le contact entre le bloc et les tiges impactées, et d'intégrer les non-linéarités matérielles (rupture des tiges, délaminage) se développant dans le tronc au cours de l'impact.Ces travaux ont conduit à la construction d'un modèle trajectographique MED permettant de simuler la propagation d'un bloc dans une forêt de taillis à l'échelle du versant. Finalement, le rôle protecteur de différents peuplements de taillis contre l'aléa de chute de bloc a été caractérisé à l'aide de ce modèle
This research work is dedicated to improve the integration of coppice stands in rockfall analyses.First, a model was built to create virtual coppice stands. This model was validated using field inventories in coppice stands.Two numerical models were developed to simulate impacts of blocks on single trees and coppice stools using the Discrete Elements Method (MED).These models were calibrated using laboratory impact tests on beech stems.They account for the influence of the root system and of the crown on the tree dynamic response, the explicit modeling of the contact between the block and the impacted stem and the non-linearity evolution into the trunk during impact.Finally, a DEM rockfall software was developed to model rockfall propagation in coppice stands.The protective role against rockfall hazard of different coppice stands was characterized with this model
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Dao, Melissa. "Impact of Dispersed Nanoparticles in Block Copolymer Soft Solids." Research Showcase @ CMU, 2016. http://repository.cmu.edu/dissertations/779.

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Block copolymer soft solids are emerging as a means to spatially organize and store nanoparticulate material. Soft solids are formed as a disordered triblock copolymer solution [PEOx-PPOy-PEOx] transitions to a lyotropic liquid crystal. For certain chain architectures, the crystal structure of the soft solid undergoes an order-order transition (OOT) from spherical micelles packed in a cubic crystal structure to close packed cylindrical micelles. The focus of this thesis is to determine the impact of processing conditions and formulation on the structural parameters, flow mechanism, and timescales of soft solids. We study the effect of structural history and applied flow fields on the soft solids while the formulation is varied by incorporating nanoparticles into the polymer matrix. In the cubic phase, we found that the ordering kinetics occur on the timescale of minutes to tens of minutes depending on the structural history and the presence of particles. Furthermore, ordering of the cubic phase through the OOT occurs epitaxially. Without nanoparticles, a short application of high amplitude oscillations will macroscopically align the cubic and cylindrical phases into a persistent near single crystal. Changing the formulation through the addition of nanoparticles makes it more difficult to align the micellar crystals by shear, decreases the persistence of the alignment, and can change the unit cell of the micelle structure. By varying the formulation and phase behavior of the polymer matrix, nanoparticles can access different types of flocculation behavior. Specifically, the particles will aggregate in both the liquid and soft solid, remain dispersed in both phases, or re-disperse upon formation of the soft solid. These findings provide additional design parameters to improve the templating of nanoparticles in the soft solid as well as highlight the feasibility of using the phase behavior of the polymer solution to control the flocculation behavior and aggregate size. Most importantly, the results in this work are crucial for effective processing of these composite systems and for development of future applications.
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Lima, Filho Marçal Rosas Florentino. "Avaliação do desempenho mecânico de protótipo executado com blocos EVA: estudo de impactos horizontais em alvenarias e suas interações com outros elementos da construção." Universidade Federal da Paraí­ba, 2008. http://tede.biblioteca.ufpb.br:8080/handle/tede/5452.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
The utilization of residues of the footwear s industry, especially E.V.A. residues(Ethilene Vinil Acetate) in the Civil Construction Industry has been the focus of the researches. It is known that such residues can be used as artificial aggregates instead of natural aggregates in the production of lightweight cement composites. The focus of this research is the mechanical conduct of EVA blocks (normal dimensions) isolated and applied in prisms and masonries. The EVA block was also evaluated in real scale in LABEME and compared with a soil-cement prototype and theoretical results. Tests of horizontal impacts and interactions between masonries and others elements of the building( abrupt shutting door tests and suspended pieces effects in walls) took place. Based on the results, the conclusion is that it is possible to propose blocks with 60% of EVA aggregate, substituting natural aggregates in volume, having a minimum resistance to compression over or equal 1,0 MPa (in Laboratory molding), that are confirmed compatible with the non-structural function. Thus, it s believed that the perspectives for the viability of the utilization of this residue in the manufacture of blocks for civil construction are very good. This will certainly contribute for a double reduction of negative impacts in the environment, as long as it offers an alternative destiny to such residues and a consummation reduction of natural resources (sand and hail), promoting the sustainable development for the activity of civil construction.
O aproveitamento de resíduos produzidos pela indústria de calçados (aparas da produção de solas e palmilhas obtidas a partir de mantas de E.V.A. - Etileno Acetato de Vinila) na construção civil tem sido meta de pesquisas recentes. Sabe-se que tais resíduos têm grande potencial para serem empregados como agregados artificiais sintéticos, em substituição aos agregados naturais, na elaboração de compósitos cimentícios leves. O foco desta pesquisa é o comportamento mecânico dos blocos EVA1 (dimensões convencionais) isoladamente e quando os mesmos são aplicados em prismas e alvenarias. Para o bloco EVA1 avaliou-se o desempenho de protótipo em escala real, construído no LABEME e se comparou aos resultados com o protótipo, também em escala real, executado com blocos solo-cimento e referenciais teóricos. Foram realizados nesse protótipo ensaios de impactos horizontais (corpo mole e corpo duro) nas alvenarias e ensaios de interações entre as alvenarias e outros elementos da construção (fechamentos bruscos das portas e efeito de peças suspensas na parede). Com base nos resultados obtidos, tendo em vista o atendimento aos critérios e requisitos de impactos, pode-se concluir que é possível propor blocos de vedação com 60% de agregado EVA, substituindo em volume os agregados naturais, tendo resistência à compressão mínima maior ou igual 1,0MPa (em moldagem no Laboratório), que são comprovadamente compatíveis com a função não estrutural. Assim, acredita-se que são boas as perspectivas para a viabilização do aproveitamento desses resíduos na confecção de blocos de vedação a serem aplicados nas edificações. Isso contribuirá seguramente para uma dupla redução de impactos negativos no meio ambiente, na medida em que oferece uma alternativa ao destino para tais resíduos e uma redução do consumo de recursos naturais (areia e pedrisco), favorecendo o desenvolvimento sustentável para a atividade da construção civil.
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Caplinger, Robert. "The Impact of Flexible Interdisciplinary Block Scheduling on Reading Achievement." Thesis, University of Oregon, 2013. http://hdl.handle.net/1794/13226.

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The purpose of this study was to examine whether the use of a middle school flexible interdisciplinary block schedule would increase eighth-grade students' reading scores, as measured by the Oregon Assessment of Knowledge and Skills (OAKS). A 90-minute middle school flexible interdisciplinary block schedule served as the independent variable and was evaluated to determine its impact on student reading achievement. Extant data from the OAKS was used to assess student learning. Extant data from two groups of students were examined. The treatment group had their eighth-grade language arts and social studies classes scheduled into 90-minute flexible interdisciplinary block periods, taught by the same teacher. The comparison group had their eighth-grade language arts and social studies classes scheduled into traditional 45-minute departmentalized periods, taught by two separate teachers. The overall amount of time allocated to language arts and social studies instruction within the academic year was the same for both groups. However, the way the time was flexed and utilized within the class periods differed between the two groups. Research Question 1 addressed the possible increase in mean OAKS reading scores over time. Research Question 2 addressed the possible differences in the mean OAKS Reading Achievement Standards cut scores over time. The results of the two-year treatment condition of a FIBS for language arts instruction did not result in statistically significant results, as measured by the OAKS. The results suggest that there may not be a significant achievement difference between schools that implement an interdisciplinary scheduled compared to schools that implement a traditional, departmental approach.
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Furet, Agathe. "Modélisations expérimentale et numérique d'ouvrages pare-blocs modulaires : Application à la technologie Bloc Armé®." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALI038.

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Cette thèse Cifre s’intéresse au comportement sous impact de structures de protection issues de la technologie Bloc Armé® proposée conjointement par Géolithe Innov et Géolithe. La structure est composée de blocs en béton liaisonnés par des armatures métalliques verticales et horizontales. L’innovation principale réside dans le système d’armatures qui assure un liaisonnement des blocs et confère à la structure une capacité à répartir les efforts et à dissiper de l’énergie.Des essais à échelle réelle permettent de caractériser la réponse dynamique de la structure selon deux types d’essais. Premièrement, la structure mise en œuvre horizontalement sur une couche support est soumise à des impacts à haute énergie (2000 kJ) par lâchers verticaux d’un impactant. Deuxièmement, des essais à énergie moindre (125 kJ) sont réalisés par impact horizontaux sur un mur vertical de dimensions limitées. Des modèles réduits de la structure, à l’échelle ¼, sont également impactés, au laboratoire. Cette campagne est l’occasion de tester de nombreuses configurations de mur dans des conditions d’impact variées. Ces campagnes expérimentales permettent d’illustrer les mécanismes par lesquels une telle structure articulée se déforme sous sollicitation dynamique localisée. Les différents modes de déplacement des murs et certains phénomènes dissipant l’énergie d’impact sont mis en évidence et quantifiés. Les nombreuses mesures faites lors des essais constituent une importante base de données expérimentales, pour accompagner le développement du modèle numérique.Un modèle numérique aux différences finies est proposé pour cette structure. Une approche réaliste est suivie pour la modélisation : chacun des éléments de la structure est modélisé explicitement. Un modèle simple est volontairement considéré pour le béton constitutif des blocs. Le modèle est calibré d’après des valeurs issues de la littérature et des mesures faites spécifiquement. La confrontation des résultats de simulations d’impact avec les résultats expérimentaux témoigne d’une bonne aptitude du modèle à reproduire le comportement dynamique global de la structure et à estimer son déplacement résiduel, en particulier. Le modèle permet de quantifier la dissipation d’énergie découlant de la plastification du béton des blocs et des frottements dans la structure. Le modèle est ensuite utilisé pour simuler la réponse de murs de géométries variées et sous impact à haute énergie. Les perspectives de ce travail sont de proposer un modèle robuste capable de simuler des impacts à énergie de l’ordre de 5 000 kJ sur des ouvrages dont la géométrie pourra être complexe
This Cifre thesis investigates the impact response of protective structures based on the Bloc Armé® technology, developed by Géolithe Innov and Géolithe. This structure is made of concrete blocks linked by vertical and horizontal metal reinforcements. The main innovation lies in the reinforcement system which ensures the bonding of the blocks and gives the structure an ability to distribute the forces and dissipate energy.Two types of real-scale experiments permit to characterize the dynamic response of the structure. Firstly, the structure laid horizontally on a support layer is subjected to high- energy impacts (2000 kJ) by freely dropping of a projectile. Secondly, lower energy impact tests (125 kJ) are carried out by horizontal impact on a vertical wall of limited dimensions. Reduced models of the structure, at ¼ scale, are also tested under impact in the laboratory. This campaign permits to test many walls of different configurations under various impact conditions. These experimental campaigns illustrate the deformation mechanisms under localized dynamic solicitation for this kind of articulated structure. The different displacement modes of vertical walls and several phenomena dissipating impact energy are highlighted and quantified. The numerous measurements made during the tests constitute an important experimental database, supporting the development of the numerical model.A numerical model, developed with the finite differences method, is proposed for this structure. A realistic approach is followed for the modeling: each element of the structure is modeled explicitly. A simple model is deliberately considered for the concrete constituting the blocks. The model is calibrated based on values from the literature and measurements made specifically. The comparison of impact simulations results with experimental ones attests of the ability of the model in reproducing the global dynamic behavior of the structure and in estimating its residual displacement, in particular. The model quantifies the energy dissipation resulting from plasticization of the concrete blocks and from friction in the structure.The model is then used to simulate the response of walls of various geometries and under high energy impact. The outlooks of this work are to propose a robust model able to simulate the structure response to impacts with energies up to 5,000 kJ, considering structures with complex geometries
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Books on the topic "Impact of blocks"

1

Royal Society of Chemistry (Great Britain), ed. Metabolism, pharmacokinetics and toxicity of functional groups: Impact of the building blocks of medicinal chemistry in ADMET. Cambridge, UK: RSC Pub., 2010.

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Centre, Raipur State Resource. Brief study of the impact & efficacy of "Saakshar Bharat Programme" in 5 GPs of 2 blocks in district Koriya of C.G.: Report 22-23rd January, 2012. Raipur: State Resource Centre (Adult & Continuing Education), 2012.

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Dyer, Jean L. Training impact analysis for land warrior block II. Arlington, Va: U.S. Army Research Institute for the Behavioral and Social Sciences, 2006.

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Walker, J. Christopher. The impact of CDBG spending on urban neighborhoods. Washington, DC: U.S. Dept. of Housing and Urban Development, 2002.

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Agarwalla, Sobhesh Kumar. Price impact of block trades and price behavior surrounding block trades in Indian capital market. Ahmedabad: Indian Institute of Management, 2010.

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Canada. Status of Women Canada. and Canada. Status of Women Canada. Policy Research., eds. The impact of block funding on women with disabilities. Ottawa: Status of Women Canada, 1998.

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Dennis, Allen. The impact of regional trade agreements and trade facilitation in the Middle East and North Africa region. [Washington, D.C: World Bank, 2006.

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Block scheduling and its impact on the school library media center. Westport, Conn: Greenwood Press, 1999.

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Kroll, John A. Closure in international politics: The impact of strategy, blocs, and empire. Boulder: Westview Pres, 1995.

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Lewis, Jeffrey D. Partners or predators?: The impact of regional trade liberalization on Indonesia. Washington, DC: World Bank, East Asia and Pacific, Country Dept. III, Country Operations Division, 1996.

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Book chapters on the topic "Impact of blocks"

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Drude, Jan Philipp, Andrea Rossi, and Mirco Becker. "Project DisCo: Choreographing Discrete Building Blocks in Virtual Reality." In Impact: Design With All Senses, 288–99. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29829-6_23.

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Chi, Ken, Arash Zakeri, and Bipul Hawlader. "Impact Drag Forces on Pipelines Caused by Submarine Glide Blocks or Out-Runner Blocks." In Submarine Mass Movements and Their Consequences, 429–39. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-2162-3_38.

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Bharathi Murugan, R., E. Rama Sai, and C. Natarajan. "Impact Response of Paver Blocks with Waste Tyre Crumb Rubber." In Lecture Notes in Civil Engineering, 669–79. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0362-3_54.

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Ankersen, Christopher, and David J. Betz. "Three Blocks, Two Towers, One Trend: Civil-Military Cooperation Before and After 9/11." In The Impact of 9/11 on Politics and War, 177–87. New York: Palgrave Macmillan US, 2009. http://dx.doi.org/10.1057/9780230623712_14.

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Jonker, Jan, and Niels Faber. "Alternative Routes." In Organizing for Sustainability, 167–75. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78157-6_13.

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AbstractThis book is designed to support you to work through the ten building blocks of the Business Model Template (BMT), grouped into three stages, from left to right and top to bottom. The underlying idea is to develop a business model from scratch by following the various steps in the Business Model Template in a straightforward and almost linear manner. There is nothing wrong with your first attempt at developing a business model. But there are many other possible routes. Here we outline five possible alternatives: (1) Idea-driven, (2) Proposition-driven, (3) Network-driven, (4) Impact-driven, and (5) Competence-driven. Depending on your circumstances, the networks you have access to, and the nature of the idea you would like to pursue, an alternative route might be worth looking at. You can still use all of the building blocks of the Business Model Template, but in a different order. That part is up to you.
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Hnydiuk-Stefan, Anna. "Impact of the Derogation Mechanism in EU ETS on the Economic Viability of Modernization of Existing Coal Blocks for Dual-Fuel Gas-Steam Systems." In Dual-Fuel Gas-Steam Power Block Analysis, 99–128. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03050-6_6.

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Jonker, Jan, and Niels Faber. "Impact." In Organizing for Sustainability, 139–50. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78157-6_11.

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AbstractThis chapter unpacks the Impact building block. It seeks to determine the impact that your business model will have on the broader social, ecological, economic, and material environment. We think it is important to clarify the short- and long-term effects of your business model. Framing and defining this building block is often challenging. It can be defined in a general sense, but can also be focused on specific stakeholders, a raw material, or a specific context or a relevant combination of indicators. Indicators are also increasingly linked to measuring and reporting methods. We offer various methods to test the set of indicators and link them to reporting standards. Keep a keen eye on the practical feasibility, as well as the costs involved in measuring and reporting. Identifying proper and useful indicators and measuring and monitoring them are easier said than done. Whatever you do, stick to the motto Keep it Simple.
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Bayha, Keith M., and William M. Graham. "Nonindigenous Marine Jellyfish: Invasiveness, Invasibility, and Impacts." In Jellyfish Blooms, 45–77. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7015-7_3.

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Bendel, Markus A. "Ganglion Impar Block." In Deer's Treatment of Pain, 487–90. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12281-2_59.

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Annabi, Emil H., Jimmy Arefieg, and Stephen Shiller. "Ganglion Impar Block." In Treatment of Chronic Pain Conditions, 153–54. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-6976-0_44.

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Conference papers on the topic "Impact of blocks"

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Harms, Kyle J. "The impact of distractors in programming completion puzzles on novice programmers position statement." In 2015 IEEE Blocks and Beyond Workshop (Blocks and Beyond). IEEE, 2015. http://dx.doi.org/10.1109/blocks.2015.7368990.

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Kim, Gyeongho, DongOk Kim, Woo-Seok Choi, Ji Ho Kang, and Jae Man Noh. "Dynamics Simulations of a Graphite Block Under Longitudinal Impact." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29683.

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Graphite blocks are important core components of the high temperature gas-cooled reactor. As these blocks are simply stacked in array, collisions among neighboring components may occur during earthquakes or accidents. Thus, it is important to develop a reliable seismic model of the stacked graphite blocks and have them designed to maintain their structural integrity during the anticipated occurrences. Various aspects involved in modeling and calculating impact-contact dynamics can affect the resulting behavior of the graphite block. These include mesh size, time step, contact behavior, mechanical constraint formulation of impact-contact analysis, etc. This work is dedicated to perform comparative studies and the effects of these parameters will be identified. The insights obtained through these studies will help build a realistic impact-contact model of the graphite block, from which a lumped or reduced dynamics model will be developed for the seismic analysis of the reactor including these graphite components.
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Ali, Iram, and S. Maheshwari. "Multiple PSK modulator design using current mode building blocks." In 2017 International Conference on Multimedia, Signal Processing and Communication Technologies (IMPACT). IEEE, 2017. http://dx.doi.org/10.1109/mspct.2017.8364017.

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Shiran, Hatef, Hassan Rahbardar Mojaver, Jocelyn Bachman, Cong Jin, and Odile Liboiron-Ladouceur. "Impact of SiO2 Cladding Voids in SiPh Building Blocks." In 2020 IEEE Photonics Conference (IPC). IEEE, 2020. http://dx.doi.org/10.1109/ipc47351.2020.9252413.

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Schaper, U., T. Kodytek, W. Kamp, and R. Kunemund. "Impact of Transitor Matching on Features of Digital Circuit Blocks." In 2007 IEEE International Conference on Microelectronic Test Structures. IEEE, 2007. http://dx.doi.org/10.1109/icmts.2007.374459.

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Xu, Chang, Wentai Zhang, and Guojie Luo. "Analyzing the impact of heterogeneous blocks on FPGA placement quality." In 2014 International Conference on Field-Programmable Technology (FPT). IEEE, 2014. http://dx.doi.org/10.1109/fpt.2014.7082750.

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Motlagh, Saeideh G., Jelena Misic, and Vojislav B. Misic. "Impact of Node Churn in the Bitcoin Network with Compact Blocks." In GLOBECOM 2020 - 2020 IEEE Global Communications Conference. IEEE, 2020. http://dx.doi.org/10.1109/globecom42002.2020.9347971.

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Armelin, Fabio B., Lirida A. B. Naviner, Roberto d'Amore, and Irany A. Azevedo. "Impact evaluation of logic blocks configuration on FPGA's soft error rate estimation." In 2016 IEEE International Conference on Electronics, Circuits and Systems (ICECS). IEEE, 2016. http://dx.doi.org/10.1109/icecs.2016.7841186.

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Heo, H. Y., D. H. Youn, and H. Chung. "Stochastic Assessment and Applications for Welding Shrinkage Impact on Production Cost." In SNAME Maritime Convention. SNAME, 2012. http://dx.doi.org/10.5957/smc-2012-p52.

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Since ship hull blocks are constructed by assembling numerous intermediate parts, negligible dimensional variations in the parts can easily accumulate to cause serious misalignment in block erection stage. Considering the welding – the primary joining process in ship production which inherently causes distortions, the quality of block’s dimensional variations during the assembly would deteriorate even faster. Thinking that the intermediate products with low dimensional quality in the ship production are not scrapped but reworked, the productivity of each workstation greatly depends on the dimensional quality of these dimensionally critical intermediate products. Reworks such as recutting, mechanical and/or thermal correction against misalignment, excessive welding for wide gap and thermal straightening are commonly subsequently increases the total production cost. One of the major dimensional accuracy control activities is the shrinkage margin design. The optimal length of excess edge is assigned to plates in order to compensate welding shrinkage. In the past, the welding shrinkage is predicted based mostly on the empirical formula or just designer's experience, so the accuracy of the assigned was relatively poor and could not effectively help reducing non-value-added rework activities. The simplified margin calculation procedure could not consider the welding sequence as well as process variations such as welding heat input. This work aims to develop the optimal shrinkage margin calculation system for dimensional quality improvement. The proposed system calculates the optimal shrinkage margin using computer-aided engineering toolsets based on finite element analysis as well as design point searching procedure adopting the quality loss function and statistical values considering shrinkage variation values during welding. The developed scheme improves the accuracy control procedure in the ship production process thus enhance competitiveness of shipbuilders in dimensional accuracy technology by minimizing the accuracy impact on productivity.
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Cardoso, Guilherme S., Tiago R. Balen, Marcelo S. Lubaszewski, Rafael G. Vaz, and Odair L. Goncalez. "Impact of TID-induced threshold deviations in analog building-blocks of operational amplifiers." In 2012 13th Latin American Test Workshop - LATW. IEEE, 2012. http://dx.doi.org/10.1109/latw.2012.6261255.

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Reports on the topic "Impact of blocks"

1

Linkov, I., F. K. Satterstrom, D. Loney, and J. A. Steevens. The Impact of Harmful Algal Blooms on USACE Operations. Fort Belvoir, VA: Defense Technical Information Center, January 2009. http://dx.doi.org/10.21236/ada494537.

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Matenga, Chrispin, and Munguzwe Hichaambwa. Impact of COVID-19 on Food Systems and Rural Livelihoods in Zambia – Round 1 Report. Institute of Development Studies (IDS), December 2020. http://dx.doi.org/10.19088/apra.2021.006.

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To assess the impact of COVID-19 on local food systems and livelihoods, a total of 115 small-scale farming households (102 male- and 13 female headed) were interviewed from five communities (Lilanda, Luang (Mankanda), Masansa, Nshinso and Miloso (Tazara Corridor) surrounding the Mkushi Farm Block in the Central Province of Zambia between 30 September and 6 November 2020. The respondents were selected as a random sample, targeting 20-25 households per community or village. The small-scale farmers in these areas benefit from linkages with commercial farmers in the block.
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Enfield, Sue. Covid-19 Impact on Employment and Skills for the Labour Market. Institute of Development Studies (IDS), February 2021. http://dx.doi.org/10.19088/k4d.2021.081.

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This literature review draws from academic and grey literature, published largely as institutional reports and blogs. Most information found considered global impacts on employment and the labour market with the particular impact for the very high numbers of youth, women, migrant workers, and people with disabilities who are more likely to be employed in the informal sector. There has been a high negative impact on the informal sector and for precariously employed groups. The informal labour market is largest in low and middle-income countries and engages 2 billion workers (62 percent) of the global workforce (currently around 3.3 billion). Particularly in low- and middle-income countries, hard-hit sectors have a high proportion of workers in informal employment and workers with limited access to health services and social protection. Economic contractions are particularly challenging for micro, small, and medium enterprises to weather. Reduced working hours and staff reductions both increase worker poverty and hardship. Women, migrant workers, and youth form a major part of the workforce in the informal economy since they are more likely to work in these vulnerable, low-paying informal jobs where there are few protections, and they are not reached by government support measures. Young people have been affected in two ways as many have had their education interrupted; those in work these early years of employment (with its continued important learning on the job) have been interrupted or in some cases ended.
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Rose, Mary. A study of the impact of the Federal ECIA, Chapter 2, block grant program on elementary and secondary education in the state of Oregon. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.819.

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DeAnna, Dixon, and Hodo Wayne. Finite element analysis of quoin block deterioration and load transfer mechanisms in miter gates : pintle and pintle connections. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/40842.

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The U.S. Army Corps of Engineers (USACE) currently operates and maintains approximately 193 commercially active lock sites with 239 locks and dams spanning nearly 12,000 miles. These networks of water channels are used to transport 600 million tons of domestic cargo, generating $405 billion in revenue annually. Nearly 60% of these structures in operation are over 50 years old and have reached design life. A failure of the miter gates could result in a major negative impact on the economy and on the ability to maintain flood control. Administrators need recommendations to better prioritize maintenance and repair of the USACE miter gates. This work investigated the influence of miter gate’s quoin block degradation on load transfer to the pintle and/or pintle connections. Results of finite element analysis are reported for the quoin block degradation simulated levels of 0%, 25%, 50%, and 75%. The parametric study shows the overstressed regions are the pintle neck and bolt-hole regions. To improve pintle designs so they may better mitigate detrimental environmental based deterioration effects, this work recommends (1) increasing the thickness of the bolt-hole connection region and (2) adding ribbing reinforcement around the neck area of the pintle.
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Millington, Kerry. COVID-19 Health Evidence Summary No.115. Institute of Development Studies (IDS), March 2021. http://dx.doi.org/10.19088/k4d.2021.030.

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This weekly COVID-19 health evidence summary (HES) is based on 3.5 hours of desk-based research. The summary is not intended to be a comprehensive summary of available evidence on COVID-19 but aims to make original documents easily accessible to decision makers which, if relevant to them, they should go to before making decisions. This summary covers publications on Clinical characteristics and management; Epidemiology and modelling; Infection Prevention and Control; Therapeutics; Vaccines; Indirect impact of COVID-19; Comments, Editorials, Opinions, Blogs, News; Dashboards & Trackers; C19 Resource Hubs; and Online learning & events.
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Millington, Kerry. COVID-19 Health Evidence Summary No.116. Institute of Development Studies (IDS), March 2021. http://dx.doi.org/10.19088/k4d.2021.035.

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This weekly COVID-19 health evidence summary (HES) is based on 3.5 hours of desk-based research. The summary is not intended to be a comprehensive summary of available evidence on COVID-19 but aims to make original documents easily accessible to decision-makers which, if relevant to them, they should go to before making decisions. This summary covers publications on Clinical characteristics and management; Epidemiology and modelling; Therapeutics; Vaccines; Indirect impact of COVID-19; Health systems; Comments, Editorials, Opinions, Blogs, News; Dashboards & Trackers; C19 Resource Hubs and Online learning & events.
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Millington, Kerry, and Samantha Reddin. COVID-19 Health Evidence Summary No.112. Institute of Development Studies (IDS), February 2021. http://dx.doi.org/10.19088/k4d.2021.021.

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This weekly COVID-19 health evidence summary (HES) is based on 3.5 hours of desk-based research. The summary is not intended to be a comprehensive summary of available evidence on COVID-19 but aims to make original documents easily accessible to decision-makers which, if relevant to them, they should go to before making decisions. This summary covers publications on Epidemiology and modelling; Therapeutics; Vaccines; Indirect impact of COVID-19; Comments, Editorials, Opinions, Blogs, News; Guidelines, Statements & Tools; Dashboards & Trackers; C19 Resource Hubs; and Online learning & events.
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9

Piotrowski, Helen. COVID-19 Health Evidence Summary No.122. Institute of Development Studies (IDS), May 2021. http://dx.doi.org/10.19088/k4d.2021.075.

Full text
Abstract:
This weekly COVID-19 health evidence summary (HES) is based on 3.5 hours of desk-based research. The summary is not intended to be a comprehensive summary of available evidence on COVID-19 but aims to make original documents easily accessible to decision-makers which, if relevant to them, they should go to before making decisions. This summary covers publications on Clinical characteristics and management; Vaccines; Indirect impact of COVID-19; Social Science; Leadership and governance; Health systems; Comments, Editorials, Opinions, Blogs, News; Dashboards & Trackers; C19 Resource Hubs and Online learning & events.
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10

Millington, Kerry, and Samantha Reddin. COVID-19 Health Evidence Summary No.110. Institute of Development Studies (IDS), February 2021. http://dx.doi.org/10.19088/k4d.2021.013.

Full text
Abstract:
This weekly COVID-19 health evidence summary (HES) is based on 3.5 hours of desk-based research. The summary is not intended to be a comprehensive summary of available evidence on COVID-19 but aims to make original documents easily accessible to decision-makers which, if relevant to them, they should go to before making decisions. This summary covers publications on Clinical characteristics and management; Therapeutics; Vaccines; Indirect impact of COVID-19; Social Science; Leadership and governance; Comments, Editorials, Opinions, Blogs, News; Guidelines, Statements & Tools; Dashboards & Trackers; C19 Resource Hubs; and Online learning & events
APA, Harvard, Vancouver, ISO, and other styles
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