Готові списки джерел за темами / Return of serve

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Добірка наукової літератури з теми "Return of serve"

Автор: Grafiati

Опубліковано: 10 січня 2023

Оновлено: 28 січня 2023

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Статті в журналах з теми "Return of serve"

Sánchez-Alcaraz, Bernardino J., Diego Muñoz, Francisco Pradas, Jesús Ramón-Llin, Jerónimo Cañas, and Alejandro Sánchez-Pay. "Analysis of Serve and Serve-Return Strategies in Elite Male and Female Padel." Applied Sciences 10, no. 19 (September 24, 2020): 6693. http://dx.doi.org/10.3390/app10196693.

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This aim of this study was to analyze serve and return statistics in elite padel players regarding courtside and gender. The sample contained 668 serves and 600 returns of serves from 14 matches (7 male and 7 female) of the 2019 Masters Finals World Padel Tour. Variables pertaining to serve (number, direction, court side and effectiveness), return of serve (direction, height, stroke type and effectiveness) and point outcome were registered through systematic observation. The main results showed that the serving pair had an advantage in rallies, under 8 shots in women and under 12 shots in men. Statistical differences according to gender and court side were found. Female players execute more backhand and cross-court returns and use more lobs than men. On the right court, serves are more frequently aimed at the “T” and more down the line returns are executed when compared to the left side. Such knowledge could be useful to develop appropriate game strategies and to design specific training exercises based on actual competition context.

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Mergheş, Petru Eugen, Beatris Simion, and Adrian Nagel. "Comparative Analysis of Return of Serve as Counter-attack in Modern Tennis." Timisoara Physical Education and Rehabilitation Journal 6, no. 12 (June 1, 2014): 18–22. http://dx.doi.org/10.2478/tperj-2014-0023.

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Abstract High performance modern tennis is characterised by high dynamism, speed in thinking and action, precision and high technical and tactical skills. In this study, we used direct observation and statistical recording of nine matches during two competition years in the tennis players Roger Federer, Rafael Nadal and Andre Agassi. In these tennis players, we studied mainly the return of serve, one of the most important shots in tennis, together with serve, as first shots in a point. We have chosen the three tennis players because they are the best example of return of serve as shown by the matches recorded and interpreted. The study we have carried out shows that return of serve makes Agassi a winner in most matches. The high percentage in Federer’s serves makes his adversaries have a lower percentage in return of serve, which prevents them to win against his serve. High percentage in return of serve results in more points on the adversary’s serve and an opportunity to start the offensive point. After comparing the three tennis players mentioned above, we can see that the highest percentage of points won on return of serve belongs to Agassi, which ranks him among the best return of serve tennis players in the world. The tennis player with the highest percentage in return of service is the one who wins the match, which shows, once again, the importance of the return of serve. Return of serve can be a strong counter-attack weapon if used at its highest level.

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Gillet, Eric, David Leroy, Régis Thouvarecq, and Jean-François Stein. "A Notational Analysis of Elite Tennis Serve and Serve-Return Strategies on Slow Surface." Journal of Strength and Conditioning Research 23, no. 2 (March 2009): 532–39. http://dx.doi.org/10.1519/jsc.0b013e31818efe29.

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Jan Carboch and Petr Smocek. "Serve and Return in Badminton: Gender Differences of Elite Badminton Players." International Journal of Physical Education, Fitness and Sports 9, no. 1 (February 28, 2020): 44–48. http://dx.doi.org/10.34256/ijpefs2014.

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Male and female players may have different game characteristics and performance. The first two shots of a rally in badminton have tactical importance. The aim of this study is to identify players' actions and behaviors and to assess differences in serve and return between the genders on the international level. We observed 15 male and 15 female matches from top international badminton tournaments. A notational analysis was used while observing the serve type, return type and the point winner. Male players hit the backhand short serve in 91 % of points and female players started the point mostly with the forehand long serve (58 %). Both genders won 50 % of the serving points. The distribution of return type is quite equal among the drop, lob, clear, smash and net shots in female matches. While returning a short serve, the lob was 4-5 % less efficient than a net shot in both genders. Women can try to use backhand short serve more often as we found the highest efficiency of all the serve types.

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Rosemond, Zsuzsa. "The Importance of Serve and Return in the Infant Classroom Settings." Képzés és gyakorlat 16, no. 3 (2018): 45–50. http://dx.doi.org/10.17165/tp.2018.3.5.

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Reynolds, Alison M., and Suzanne L. Burton. "Serve and return: Communication foundations for early childhood music policy stakeholders." Arts Education Policy Review 118, no. 3 (December 9, 2016): 140–53. http://dx.doi.org/10.1080/10632913.2016.1244779.

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Hizan, Hazuan, Peter Whipp, Machar Reid, and Jon Wheat. "A comparative analysis of the spatial distributions of the serve return." International Journal of Performance Analysis in Sport 14, no. 3 (December 2014): 884–93. http://dx.doi.org/10.1080/24748668.2014.11868765.

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Hizan, H., P. Whipp, and M. Reid. "Post-match recall of serve and serve-return patterns in high-performance junior male and female tennis players." Journal of Fundamental and Applied Sciences 9, no. 6S (February 1, 2018): 468. http://dx.doi.org/10.4314/jfas.v9i6s.36.

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Cao, Yang. "MULTIPLE SERVER PREEMPTIVE SCHEDULING WITH IMPATIENCE." Probability in the Engineering and Informational Sciences 31, no. 2 (May 31, 2016): 226–38. http://dx.doi.org/10.1017/s0269964816000176.

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There are n customers that need to be served by m parallel servers (n≥m). Customer i will only wait in queue for an exponentially distributed time with rate λi before departing the system. The service time on server j is exponentially distributed with rate μj for all customers, and upon completion of service of customer i a positive reward ri is earned. The non-preemptive problem is to choose, after each service completion, which currently in queue customer to serve next. The preemptive problem is to decide when to preempt a service, and to choose, after each service completion or preemption, which currently in queue customer to serve next. The objective of both problems is to maximize the expected total return. We give conditions under which a list policy is optimal for both problems.

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Hizan, Hazuan, Peter Whipp, and Machar Reid. "Comparison of serve and serve return statistics of high performance male and female tennis players from different age-groups." International Journal of Performance Analysis in Sport 11, no. 2 (August 2011): 365–75. http://dx.doi.org/10.1080/24748668.2011.11868556.

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Дисертації з теми "Return of serve"

Pantzerhielm, Johan. "En analys av de viktigaste slagen i tennis." Thesis, Linköpings universitet, Matematisk statistik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166022.

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Tennis är en sport som ständigt förändras. Nya data som analytikern Craig O'Shannessy tagit fram visar att en klar majoritet av alla poäng är korta, det vill säga poäng som innehåller fyra eller färre slag. Den spelare som vinner flest av dessa tenderar även att stå som segrare i slutet av matchen. Målet med det här arbetet är att undersöka WTA-turneringen Sydney International 2018 för att se om samma mönster går att hitta där och, om så är fallet undersöka om det finns några skillnader mellan hur olika grupper presterar. Ett par exempel på grupper är matchvinnare mot förlorare och seedade mot oseedade spelare. Det visade sig att poänglängderna nästan var identiska med O'Shannessys resultat och de hade påverkan på utgången av matcherna. Vidare så låg matchvinnarna högre i de flesta kategorierna som exempelvis andelen servar och returer in och andelen vunna. Gällande serve+1 så höll de en jämn nivå både på forehand- och backhandsidan, jämfört med de förlorande spelarna som hade problem med backhanden. Däremot gick det inte att se några tydliga skillnader i serve- och returmönster, bortsett från andraservar till deuce court. Utifrån resultaten så verkar kvaliteten på slagen vara mer avgörande än var i banan som de landar.
Tennis is an everchanging sport. New data from tennis analyst Craig O'Shannessy show that a vast majority of points are short, i.e. points decided in four or fewer shots. The player who wins most of them also tends to be the winner. The purpose of this paper is to examine the WTA tournament Sydney International 2018 to see if the same pattern occurs there and if that is the case investigate if there is any difference between how different groups are performing. A few examples of groups are match-winners against losers and seeded against unseeded players. It turns out that the lengths of the points were almost identical to O'Shannessy’s results and they influenced the matches outcome. Furthermore, match winners performed better in most categories, for example, the ratio of serves and returns in play and won. Regarding serve+1 they were able to keep an even level on both forehand and backhand side, while the losing players had some problems with their backhands. With that said, there were no clear differences in serve and return patterns, apart from second serves to the deuce court. From the results, it seems like the quality of the shots is more important than where they are landing.

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NEYRAND, DENIS. "Valeur des parametres cliniques et echographiques dans le depistage du retard de croissance intra-uterin : a propos d'une serie prospective realisee dans les maternites de l'hopital edouard herriot et de l'hopital de la croix rousse en 1988." Lyon 1, 1989. http://www.theses.fr/1989LYO1M346.

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GALLART, MARTINE. "Suivi a long terme d'une serie continue de patientes ayant une endometriose pelvienne traitee par d-trp6-lh-rh retard associe ou non a un geste coeliochirurgical ou chirurgical." Aix-Marseille 2, 1992. http://www.theses.fr/1992AIX20024.

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Gomes, Rainete de Medeiros. "Desafio na gest?o de pessoas: reten??o de servidores na Universidade Federal do Rio Grande do Norte." PROGRAMA DE P?S-GRADUA??O EM GEST?O DE PROCESSOS INSTITUCIONAIS, 2016. https://repositorio.ufrn.br/jspui/handle/123456789/22310.

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A presente pesquisa surgiu a partir da inten??o de identificar o perfil dos servidores T?cnico-Administrativos em Educa??o da Universidade Federal do Rio Grande do Norte (UFRN) que solicitaram Vac?ncia por Posse em Outro Cargo Inacumul?vel e Exonera??o dos cargos ocupados na referida Institui??o, no per?odo de 2010 a 2015. Al?m disso, buscou entender os reais motivos que levaram essas pessoas a sa?rem do v?nculo empregat?cio considerando todo o vi?s que envolve as rela??es de trabalho existentes na Organiza??o. A revis?o bibliogr?fica foi centrada em documentos legais que regem a carreira dos servidores T?cnico-Administrativos das Institui??es Federais de Ensino Superior (IFES), a estrutura da UFRN e trabalhos de autores que desenvolveram estudos sobre esse tema, al?m de pesquisas sobre o estado da arte. Trata o presente estudo de uma pesquisa de levantamento descritivo e, para atingir seus objetivos, foi realizada coleta de dados atrav?s da aplica??o de um question?rio online utilizando-se da ferramenta Google docs para chegar ? popula??o pesquisada, que totalizou 268 pessoas. Conclu?da a coleta de dados, obteve-se o retorno de 122 question?rios respondidos, sendo utilizado para tratamento destas informa??es o SPSS (Statistical for Social Sciences). O principal motivo apontado como insatisfa??o no ?rg?o refere-se ? remunera??o inerente ? Carreira dos Servidores T?cnico-Administrativos, representada pelo percentual de 91,2% das respostas e, por essa raz?o, pode-se concluir o entendimento pela busca por novos cargos no servi?o p?blico, confirmada pelo resultado de 77% dos casos. Com base nos dados desse estudo, percebe-se que, apesar do alto ?ndice de insatisfa??o com as quest?es salariais, de modo geral, o clima organizacional e a satisfa??o nas rela??es de trabalho se apresentaram de maneira favor?vel ? Institui??o pesquisada.
Present research arose from intention to identify the profile of Education Administrative Techinicians of Federal University of Rio Grande do Norte (UFRN) who requested Vacancy by Possession in Another Unaccountable Position and Exoneration, from occupied positions in that Institution between 2010 and 2015. In addition, It sought to understand real reasons that led these people to leave their employment bond considering all the bias that surrounds existing labor relations in the Organization. Bibliographic Review focused on legal documents governing career of the Administrative Techinicians of Federal Institutions of Higher Education (IFES), structure of UFRN and works of authors who have developed studies on this subject, as well as researches on the state of the art. This study concerns a descriptive survey and, in order to achieve its objectives, data collection was performed through the application of an online questionnaire using Google Docs tool to reach surveyed population, which totalized 268 people. 122 questionnaires were responded, and SPSS (Statistical for Social Sciences) was used to treat this information. Main cited reason as dissatisfaction in the Board refers to remuneration inherent to the Career of Administrative Techinicians, represented by the percentage of 91.2% of the answers and, for this reason, one can conclude the understanding for seeking new positions in Public Service, confirmed by the result of 77% of the cases. Based on the data of this study, it is noticed that, in spite of the high index of dissatisfaction with the salary issues, in general, organizational climate and the satisfaction in labor relationships presented a favorable way to researched Institution.

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Šedivý, Jozef. "Řízení stejnosměrného bezkartáčového motoru za podmínek ztráty napájecího napětí." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220902.

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Táto diplomová práca sa zaoberá implementáciou bezpečnostnej funkcie pre elektrický aktuátor, ktorá spočíva v riadení BLDC motora, po výpadku napájacieho napätia, keď je aktuátor poháňaný vstavanou pružinou.. Celé riadenie motora je navrhnuté v prostredí Matlab-Simulink technikou nazývanou návrh systému z modelu. Následne pomocou automatického generovania kódu bol získaný zdrojový kód, ktorý bol použitý v reálnom aktuátore a odtestovaný v reálnych podmienkach. Cieľom týchto testov bolo overiť reálnu možnosť nasadenia vyvinutých algoritmov v reálnych, komerčne dostupných produktoch.

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Almeida, Samary Carvalho de. "An?lise de retorno de escala e tamanho do mercado no desempenho de equipes de vendas aplicando an?lise de envolt?ria de dados DEA: um estudo em empresa de Telecomunica??es no Brasil." Universidade Federal do Rio Grande do Norte, 2007. http://repositorio.ufrn.br:8080/jspui/handle/123456789/14882.

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This Master s Thesis proposes the application of Data Envelopment Analysis DEA to evaluate the performance of sales teams, based on a study of their coverage areas. Data was collected from the company contracted to distribute the products in the state of Cear?. Analyses of thirteen sales coverage areas were performed considering first the output-oriented constant return to scale method (CCR-O), then this method with assurance region (AR-O-C) and finally the method of variable returns to scale with assurance region (AR-O-V). The method used in the first approach is shown to be inappropriate for this study, since it inconveniently generates zero-valued weights, allowing that an area under evaluation obtain the maximal score by not producing. Using weight restrictions, through the assurance region methods AR-O-C and AR-O-V, decreasing returns to scale are identified, meaning that the improvement in performance is not proportional to the size of the areas being analyzed. Observing data generated by the analysis, a study is carried out, aiming to design improvement goals for the inefficient areas. Complementing this study, GDP data for each area was compared with scores obtained using AR-O-V analysis. The results presented in this work show that DEA is a useful methodology for assessing sales team performance and that it may contribute to improvements on the quality of the management process.
Esta tese de mestrado prop?e utilizar a An?lise de Envolt?ria de Dados - DEA (Data Envelopment Analysis) na avalia??o de desempenho das equipes de vendas a partir de um estudo de suas ?reas de atua??o. S?o utilizados dados obtidos junto ? empresa contratada para distribui??o dos produtos no estado do Cear?. As an?lises das treze ?reas de vendas foram realizadas considerando o m?todo de retorno constante de escala orientado a produto (CCR-O), em seguida, esse m?todo com utiliza??o de regi?o de garantia (AR-O-C) e por ?ltimo o m?todo de retorno vari?vel de escala com utiliza??o de regi?o de garantia (AR-O-V). O m?todo utilizado na primeira abordagem mostra-se inapropriado para este estudo pois apresenta o inconveniente de gerar pesos com valor igual a zero, permitindo que uma ?rea avaliada obtenha escore m?ximo n?o produzindo. Utilizando-se restri??es de pesos, atrav?s dos m?todos da Regi?o de Garantia AR-O-C e AR-O-V, identificam-se a exist?ncia de retornos decrescentes de escala significando que a melhoria de desempenho n?o ? proporcional ao tamanho das ?reas analisadas. Atrav?s do m?todo AR-O-V foram encontradas nove ?reas eficientes. Observando os dados gerados pelas an?lises faz -se um estudo para projetar metas de melhoria para as ?reas ineficientes. Complementando o estudo, comparam-se os dados do PIB de cada ?rea com os escores obtidos na an?lise A R-O-V. Os resultados apresentados nesse trabalho garantem a utilidade da DEA como metodologia para a avalia??o de desempenho das equipes de vendas podendo contribuir para a melhoria da qualidade do seu processo de gest?o.

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Liu, Chi-Fan, and 劉記帆. "A Discussion on Single Serve Advantages and Return Performance of Receive of Top Women Tennis Professional Player." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/41300895222861821887.

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碩士
國立臺灣師範大學
運動競技學系
103
Purpose: This study aims to explore the serve advantages of top women players in single serve game and major return performance of receive in the receive game. Methods: This study takes 15 competitions of women singles from Round 16 to finals in Australian Open 2014 as scope and analyzes the major score methods and return methods of top women players in the receive game with descriptive statistics and pivot table analysis. Results: 1.The average first and second serve scoring rate of top women players in the serve game are 64% and 87% respectively. Those of the serve winning rate are 62% and 51%. The major scoring performance is serve advantage. 2.In the receive game, the average first and the second receive scoring rate is 78% and 88% separately. Those of the receive winning rate are 38% and 49% with the defense and standoff as major return methods. 3.When being broken in the serve game, the first and the second serve scoring rate reduces to 60% and 82% respectively. The first serve winning rate reduces to 35% and that of the second reduces to 26 which are related to reduction of serve advantage scoring. 4.When break successfully in the receive game, the first and the second receive scoring rate is 86% and 94% respectively. The first receive winning rate is 65% and the second receive winning rate is 74% which are related to the increase of offensive return. Conclusions: 1.The major scoring method of top women players is serve advantage in the serve game. The first serve scoring rate, winning rate and serve advantage reach over 60%. However, the first serve scoring rate reduces over 60% below and the second serve scoring rate reduces over 80% below. The first serve winning rate reduces over 40% and the second serve winning rate reduces over 30%. In this way, they are easy to be broken. 2.In the receive game, the major return methods are defense and standoff, but the reasons to break successfully are caused by increase of offensive return. When break successfully, only by reaching over 40% in the second serve winning rate with offensive return can the players have chance to break.

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Sommer, Jakub. "Analýza tenisové dvouhry na antukovém povrchu." Master's thesis, 2016. http://www.nusl.cz/ntk/nusl-349044.

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Title: Analysis of tennis single on clay Objectives: The aim of the work was to analyze 10 elite players on clay and also to discover differences in observed aspects of their plays. Methods: The analysis was done by observing video recordings of chosen matches from the French Open 2016 tournament. It was a notational analysis. The results were recorded into record sheets that were prepared in advance. Firstly, descriptive analysis was used to analyze all of the matches. Thereafter, all of the matches were analyzed by descriptive analysis of graphs and measured values. Results: The results show different techniques and styles among male athletes on clay, given the service and its variations, the return and its variations, the length of plays, and other observed aspects; resulting in other tactical differences among the players. Keywords: Tennis, men, differences, serve, return

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Kolářová, Hana. "Komparace badmintonového utkání ve dvouhře mužů a žen." Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-387385.

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Title: Comparison of the badminton match in men's and women's singles Objectives: The goal is identify the most effective a choice combinations of the first three shots, leading to the acquisition point in singles between the best Czech male and female players. And also to discover determine and compare which was the usage of different types of serve, return and the third shots. Methods: Comparison of differences in badminton match between genders was based on indirect observation - video analysis. Statistics were used for data processing. Results: The results shower huge difference in tactical approaches among men and women players. Women preferred long high service and most of the service returns were played into back backhand court area and the third shot usually routed into back forehand court area. It means that the most played shot was a clear shot and the most occupied part of court was a back backhand corner. Despite more successful was when women players played drop by their third shot. Domination of short backhand service was seen by men players, the second shot routed the same direction like women players second shot - to the back backhand court, but also to the front part of the court. Third shot was mostly played into back backhand part of the court. If players wanted to be successful,...

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Smoček, Petr. "Analýza badmintonového utkání ve dvouhře mužů a žen." Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-379158.

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Title: Analysis of the badminton matches in men's and women's singles The goals of essay: Main goal of the essay is to find out differences in first three shots and its most common combinations in single matches of men and women in relation to gaining a point during the rally. Another goal was to find frequency of using backhand and forehand hold in second and third shot. The last goal was to compare the frequency of ending in first, second and third shot between men and women. Methods: Indirect analysis - videoanalysis Results: According to results men and women primarily choose different types of serving. Men most often use short backhand serve, women high forehand serve. For the second shot men choose short shot or lob, women use smash. The third shot is lob in men rally, women choose short shot most often. Generally men uses in the first three shots shots less clears than women do. For both sexes are the most effective shots offensive ones, but men are more successful than women. The most effective direction of return was for men and for women the body of the player, in third shot it was the backhand side too (left middle and left back of the field). Men were more successful with forenhand, women with backhand. The frequenc of endings to third shots shows that women more often end the rally...

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Книги з теми "Return of serve"

Such, Larry Van. Serve faster, return harder & move quicker with isometric training! [S.l.]: Precision Fitness, 2006.

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Encuesta sobre migración en la frontera Guatemala-México, 2007: Serie histórica 2004-2007. México, D.F: Instituto Nacional de Migración, 2009.

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Encuesta sobre migración en la frontera Guatemala-México, 2006: Serie histórica 2004-2006. México, D.F: Instituto Nacional de Migración, 2009.

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Encuesta sobre migración en la frontera sur de México, 2009: (EMIF SUR), serie histórica 2004-2009. México, D.F: Instituto Nacional de Migración, 2012.

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Centro de Estudios Migratorios (Mexico). Encuesta sobre migración en la frontera sur de México, 2008: (antes EMIF GUAMEX), serie histórica 2004-2008. México, D.F: Instituto Nacional de Migración, 2011.

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Pia, Pozzato Maria, and Dodaro Daniele, eds. Passione vintage: Il gusto per il passato nei consumi, nei film e nelle serie televisive. Roma: Carocci, 2013.

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Sindell, Kathleen. Loyalty marketing for the Internet Age: How to identify, attract, serve, and retain customers in an e-commerce environment. Chicago, IL: Dearborn Financial Pub., 2001.

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Office, General Accounting. Tax administration: IRS faces several challenges as it attempts to better serve small businesses : report to the Chairman Committee on Small Business, U.S. Senate. Washington, D.C: The Office, 2000.

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Great Britain. Colonial Office. Governors of colonies: Return to an address of the Honourable the House of Commons, dated 24 March 1852, for, a return of the names of all governors and lieutenant-governors of the different colonies, stating their salaries, dates of appointment and places of residence : distinguishing those who have served in the army and navy, with the amount of their pay and emoluments, in addition to their salaries as governors. [London: HMSO, 2001.

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Great Britain. Colonial Office. Governors of colonies: Return to an address of the Honourable the House of Commons dated 22 June 1854 for, "Return, in a tabular form, of the names of all governors and lieutenant-governors, and parties acting in such capacities, of the different colonies, stating, in British money, their salaries and the date of their appointments, the places of their residence, and the countries or districts over which they preside : distinguishing those who have served in the army and navy". [London: HMSO, 2002.

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Частини книг з теми "Return of serve"

Lv, Chengdong. "Serve the Country Through Engineering." In Return to China One Day, 33–57. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5755-0_2.

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Courtemanche, Richard, Daniela Popa, and Clément Léna. "Exploring Oscillations in Expert Sensorimotor Anticipation: The Tennis Return of Serve." In Neuronal Oscillations of Wakefulness and Sleep, 3–44. New York, NY: Springer New York, 2020. http://dx.doi.org/10.1007/978-1-0716-0653-7_1.

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Dosani, Aliyah, Dianne Creighton, and Abhay K. Lodha. "Late Preterm Infants and Neurodevelopmental Outcomes: Why Do I Need to Serve and Return?" In Late Preterm Infants, 115–34. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-94352-7_9.

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Castagnone-Sereno, Philippe. "Isolation and characterization of tandem repeats in nematode genomes." In Techniques for work with plant and soil nematodes, 240–49. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781786391759.0240.

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Abstract This chapter provides an overview of the practical methodologies that can be used to identify and characterize the tandem repeats that are most frequently used as genetic markers in nematodes (including plant-parasitic and entomopathogenic nematodes), namely satellite DNA and microsatellites. The objective is not to provide turnkey protocols, but rather to return to the main principles that govern these protocols. Case studies on nematodes will serve to illustrate the point. In that respect, two well-defined situations are to be considered, depending on whether genomic resources for the species under investigation are available or not.

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Chatterjee, Ritushree, Darshana Juvale, Long He, and Lynn Lundy Evans. "Back to Design Basics: Reflections, Challenges and Essentials of a Designer’s Survival Kit during a Pandemic." In Global Perspectives on Educational Innovations for Emergency Situations, 99–107. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99634-5_10.

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AbstractInnovation is at its best when we are thrusted into an emergency situation that tests protocols and established norms. In this chapter, authors reflect on the journey of a team of instructional designers in an online learning design unit of a large mid-western university amidst COVID-19. With the influx of a multitude of courses to be transitioned to the online platform, authors describe challenges faced by their unit, coping mechanisms, and lessons learned during this phase. They describe inclusive design thinking and uninterrupted practice in return to robust instructional design models, such as Understanding by Design and Universal Design for Learning. The chapter concludes with examples of tried and tested internal tools and an adaptive workflow catering to a shortened development timeline. These practices and reflections serve as a guiding light as the global world navigates online learning to meet increasing demands of new-age digital accessibility and online course design considerations in higher education beyond COVID-19.

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"Kinematic analysis of footwork for return of serve on world’s elite tennis players." In Modeling and Computation in Engineering II, 213–18. CRC Press, 2013. http://dx.doi.org/10.1201/b14896-33.

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Rothe, Eugenio M., and Andres J. Pumariega. "Transnational Identities, Pilgrimages, and Return Migrations." In Immigration, Cultural Identity, and Mental Health, 149–60. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780190661700.003.0007.

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The chapter on transnational identities, pilgrimages, and return migrations explains the concept and importance of the term transnationalism and the new socioeconomic dynamics that take place between immigrants to the United States and the flow of cultural exchange and monetary remittances to the relatives in the country of origin. It expands on how the use of new communication technologies and more accessible air transportation have contributed to globalization and how this globalization has changed the immigrant experience, leading to a process of interculturation. It expands on the particular immigrant experience of Puerto Ricans and also discusses the dynamics of those whose stay behind in the country of origin. This chapter explains the psychodynamic meaning of nostalgia and discusses the reasons and motivations that generate return migrations to the country of origin. It also discusses the socioeconomic and psychodynamic issues of those who chose to return and how the transfer of newly acquired skills and knowledge impacts the country of origin, as well as the psychodynamic and socioeconomic issues that result in the encounter between those who chose to stay and those who return. This chapter also discusses the meaning of pilgrimages to the lands, not of the immigrants’ birth, of their ancestral family histories and how these pilgrimages serve as intrapsychic organizers that lead to the integration and enrichment of the person’s cultural identity and may promote personal growth. The topics are explained and illustrated with various case studies.

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Chea, Chiam Chooi. "Open Distance Learning in Heritage Recognition and Appreciation." In Open and Distance Learning Initiatives for Sustainable Development, 189–211. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-2621-6.ch010.

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Heritage appreciation has been easily neglected and been taken advantage of over the years despite its invisible primary role in the tourism industry. The value of heritage is invaluable and its loss is an irreversible loss to the nation as a whole. Heritage appreciation could play an important role in rural development, with mostly positive impact to the local and economy as the whole. Tourism has many potential benefits for rural areas because it can secure more jobs for non-metro communities, especially for those that are economically underdeveloped. Mainly because jobs in the tourist industry often do not require advanced training, local residents with few skills can readily work as food servers, retail clerks and hospitality workers. Tourism also not only offers business opportunities to local residents, but it can serve as an opportunity for tourists to return later to retire or start a business locally. Tourism can also enhance local quality life where tourism can serve as an important course of tax revenues for governments.

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Qabaha, Ahmad. "The Exile’s Memory and the Chronotope in Ghada Karmi’s Return: A Palestinian Memoir." In Post-Millennial Palestine, 67–82. Liverpool University Press, 2021. http://dx.doi.org/10.3828/liverpool/9781800348271.003.0005.

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This chapter explores the role of memory in Ghada Karmi’s Return: A Palestinian Memoir (2015). Building on theorizations of exile and memory, alongside Mikhail Bakhtin’s theoretical concept of the chronotope, this chapter assesses how memories conceive of a particular place in time. The chapter suggests that Karmi’s memories of Palestine function as the main component of her incoherent and transient national experience, and it explores the potential for resistant acts contained within her narrative of personal memory. Visiting Palestine for the first time since her childhood, Karmi ponders the power of memory, and explores how its articulation across time and space provides opportunities to resist Palestine’s political and historical negation. The chapter contends that, within her memoir, Karmi illustrates how (exilic) Palestinian writing can serve as a ‘custodian’ of Palestinian national history.

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Тези доповідей конференцій з теми "Return of serve"

Vistisen, Peter. "Return of the Vision Video: Can Corporate Vision Videos Serve as Setting for Participation?" In Nordes 2017: Design and Power. Nordes, 2017. http://dx.doi.org/10.21606/nordes.2017.026.

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Masai, Katsutoshi, Takuma Kajiyama, Tadashi Muramatsu, Maki Sugimoto, and Toshitaka Kimura. "Virtual Reality Sonification Training System Can Improve a Novice's Forehand Return of Serve in Tennis." In 2022 IEEE International Symposium on Mixed and Augmented Reality Adjunct (ISMAR-Adjunct). IEEE, 2022. http://dx.doi.org/10.1109/ismar-adjunct57072.2022.00182.

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Williams, John F., and John C. Parker. "Measuring the Sustainable Return on Investment (SROI) of Waste-to-Energy." In 18th Annual North American Waste-to-Energy Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/nawtec18-3552.

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Waste to Energy facilities serve their communities in a number of important ways. Our industry does a terrific job reducing volumes that would have otherwise been destined for landfills. Energy recovery is an important and positive byproduct of that process but not the only one. Beyond these two obvious attributes you seldom hear of anything else. This is unfortunate because there are significant social, environmental, and economic benefits associated with the technology. Industry “silence” can be attributed to an inability to describe those benefits in ways people understand or see a dollar value in. In other words, we have a tough time measuring the value of “Green.” This paper describes a framework through which we can make the case for sustainable benefits associated with Waste to Energy. It begins with discussion of why it is important to seek a connection with the “triple bottom line” including the social, environmental, and economic attributes of a given program/project/facility. It sheds light on the need to think beyond traditional life cycle cost analysis techniques that focus on direct cash benefits. It describes a process through which noncash and external costs and benefits can be calculated and presented in monetary terms, referred to as the Sustainable Return on Investment or SROI (direct cash + noncash + external costs and benefits = SROI). This paper should help readers make an aggressive case to reveal the FULL VALUE of Waste to Energy across the sustainability triple bottom line.

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Blazejewski, Theodore E., and Rajneesh Moudgil. "The BOS Compressor: An Economical Compressor Developed to Serve the Higher Speed, Higher Rod Load, and Higher Horsepower Requirements of the Gas Pipeline, Storage, Gathering, Process, and Similar Industries." In 2002 4th International Pipeline Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ipc2002-27219.

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Traditionally, large slow speed integral gas engines were used in Pipeline applications. Today, the need exists for smaller high-speed units with a lower total installed cost and quicker return on investments. Utilizing well over 100 years of gas compressor experience, Dresser-Rand has developed a new Big Oilfield Separable (BOS) frame and Dresser-Rand Advanced Reciprocating Technology (DART) cylinder line-up to serve the high-speed engine and motor driven Pipeline/Injection markets. By incorporating a longer stroke capability, this compressor also serves the electric motor driven Process Gas markets. First, this paper will identify the complete design, development, and test verification of the frame and running gear. Second, this paper will then identify the complete design, development, and performance verification of the DART cylinder. Together, the BOS frame and DART cylinders provide an economical replacement to the older slow speed integral gas engines that are utilized in Pipeline applications.

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Sundaralingam, Vikneshan, Steven Isaacs, Pramod Kumar, and Yogendra Joshi. "Modeling Thermal Mass of a Data Center Validated With Actual Data due to Chiller Failure." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65573.

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The task of minimizing the downtime of a data center is becoming increasingly important due to the necessity of availability and maintaining the integrity of the data being handled by the data center. Consequently, a model used to predict the thermal response of a data center would be useful information in designing mechanisms to minimize the downtime during a failure or to serve as an alternative analysis method other than CFD. This paper will focus on a thermodynamic approach of predicting the thermal response of the data center space with the use of lumped system analysis. The model will be developed and validated using actual data from a chiller failure event in the CEETHERM Data Center Laboratory. Events in sequence are: (i) Chiller failure, (ii) Data center shutdown due to critical temperatures and (iii) Chiller restored. To illustrate, the data center section of interest consists of 10 racks of servers (maximum capacity of 24kW for each rack) with a total of 3360 nodes and is chilled using chilled water from the building chiller, through which the cooling resources are distributed using a rear door heat exchanger and a cooling room air conditioning unit (CRAC). The relevant and important data that was recorded in this failure are the: (1) Server inlet temperatures, (2) CPU temperatures, (3) CRAC supply and return air temperatures, (4) Chiller supply and return water temperature, (5) Chiller flow rate, (6) Data center space temperature and humidity, (7) Server power draw and (8) CRAC fan speeds.

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Nguyen, Hung, Shoubo Wang, Ram S. Mohan, Ovadia Shoham, and Gene Kouba. "Experimental Investigations of Droplet Deposition and Coalescense in Curved Pipes." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88365.

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Even though there have been several studies conducted by the industry on the use of different inlet devices for gas-liquid separation there have been limited laboratory and field evaluations on the use of external piping configurations as flow conditioning devices upstream of a separator inlet. The results of a systematic study of droplet deposition and coalescence in curved pipe and pipe fittings are reported in this paper. A facility has been designed consisting of two main test sections: a fixed horizontal straight pipe section and an interchangeable 180° return pipe section (or curved pipe section) of the same length. Both inlet and outlet to the 180° return are horizontal, but the plane of the 180° return pipe section can pivot about the axis of the inlet horizontal pipe to an angle as much as 10° downwards allowing downward flow in the return section. Various pipe fittings of different radius of curvature can be installed for comparison in the 180° return. Fittings evaluated in this study included: 180° pipe bend, 2 standard radius elbows (with radius of curvature of 1.5D), 2 long radius elbows (with radius of curvature of 6D), 2 target tee bend, and 2 cushion tee bend. Experiments have been carried out using water and air and varying gas velocities and liquid loadings. In order to compare the performance of geometries, Droplet Deposition Fractions (DDF) were measured in the horizontal straight pipe section and in the 180° return pipe section as a measure of coalescence efficiency. The results demonstrate that higher DDF occurs for curved fittings as compared to the straight pipe section. Two standard (short) radius elbows bend have approximately 10% DDF higher, whereas two long radius elbows along with 180° pipe bend perform better (by 15–20% DDF) than straight pipe. Additionally, no significant differences between DDF’s in three different inclination angles of a curved pipe were observed. It was found that the cushion tees and target tees can coalesce droplets at lower gas velocities but break up droplets at higher gas velocities. It can be concluded that 180° pipe bend or two 6D long radii elbows can serve as a droplet coalescer, a pair of cushion tees or target tee can also work as coalescer at low kinetic energy but as atomizers at high kinetic energy.

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Swensen, John P., and Aaron M. Dollar. "Active-Cells for the Construction of Redundant and Configurable Articulated Structures." In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3154.

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This paper describes preliminary design and analysis of “active cells” used for the construction of homogeneous actuated electromechanical composite structures made from many of these electromechanical active cells. Each cell consists of a simple rapid-prototyped outer shell containing both a contractile Nitinol element and a return spring, such that these tiny, self-contained contractile engineered cells can serve as the building blocks for larger articulated structures. Each cell occupies approximately 3.0 cm3 in volume. Design considerations are explored that will affect the packing of a number of cells in a mold with a highly elastic binding agent to constrain them. The structures made from these cells can be easily fabricated in a nearly arbitrary shape — by producing an appropriate mold to contain the cells — and can be highly redundant and robust to localized cell failures. The composite structure is actuated via the application of an electrical potential across each of the individual cells, causing the cells to activate through resistive heating. The material properties of the ensemble structure can be varied by changing the properties of the binding material and the return springs of the cells, thus enabling the design of a wide range of stiffness and damping properties.

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Yekta, Kaveh, Ray Phung, Benjamin Stang, and Tyler Woitas. "Application of Real-Time Solid Measurement and Return Flow Rate During Coiled Tubing Milling Operations." In SPE/ICoTA Well Intervention Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/204451-ms.

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Abstract Among the many applications of Coiled Tubing (CT) services, milling plugs and wellbore sand cleanout are two of the major applications. The transport of solids to the surface, as well as monitoring the return rates, are two sources of information which can have a significant impact on the execution of these jobs. Traditionally the flowback crew communicates this information to the CT control cab upon request. However, by utilizing an acoustic monitor and ultrasonic flowmeter, it can reduce the dependence on flowback operators and provide real-time solid measurement and return flow rate. The acoustic monitor is a passive, non-intrusive device that is designed to measure the acoustic noise induced into the pipe wall as solids impact the inside wall of the pipe. The ultrasonic flowmeter is a clamp-on device that is designed with two transducers that serve as both a transmitter and receiver. In order to prove the concept, five stages of trials were planned and executed. In stage one, CT was rigged into a 150m vertical test well. The equipment included CT mast unit, CT pump, choke manifold, and acoustic monitoring device. Several debris piles from previous milling operations were introduced to the test well, and a CT cleanout was performed. The acoustic monitor system measured the amount of solid to surface, and the results were evaluated. Solids retrieved were then compared to the initial debris piles and correlated to the data received by the acoustic monitor. On the 2nd stage, the acoustic monitoring device was utilized in actual milling operation. The 3rd stage was a yard trial of ultrasonic flowmeter using a CT pump and data acquisition system to evaluate the working envelope of this device, followed by a field trial, in stage 4, utilizing the flowmeter in actual milling operations. The final stage of this trial was planned and executed in milling operations on a five wells pad, utilizing the combined applications of acoustic monitoring (solid measurement) and ultrasonic flowmeter (return rate) devices. All five stages contributed to proof of concept for the applications of solid measurement and return flow rate devices. These trials were successfully planned, executed, and evaluated. The acquired data throughout the five stages of these trials were utilized during and post job operations as lessons learned to optimize the process for future applications. The real-time measurement of solids and flow rate monitoring, independent of flowback operators, enables the CT operator to make informed decisions throughout milling and cleanout operations. The real-time streaming of solids to surface and return flow rate enables the operator and service company’s Engineering team to evaluate and optimize the execution of milling and sand cleanout operations.

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Permadi, Kemal, Athena Anatolia Firdauzi, Syamsuar Syamsuddin, and Sabdo Waluyo. "Reliability Improvement of Auxiliary Boiler Feed Water Pump Caused by Vibration Issue and Capacity Oversized by Pump Upgrading Using Frequency Response Function Inspection Test Method Basis." In SPE Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210708-ms.

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Abstract Two Auxiliary Boiler Feed Water Pump (ABFW) serve as a fluid supplier into the boiler to support the operation for steam system in Floating Storage and Offloading (FSO) Gagak Rimang. During FSO Gagak Rimang operation, steam system is produced through 2 unit boilers to run Cargo Oil Pump (COP) intermittently during lifting activity. In order to maximize boiler operation, the fluid has to be inside the envelope of design parameter specification. Therefore, the reliability of the ABFW pumps are very essential to ensure smooth and stable lifting operation. Historically, the performance of this ABFW pump was degraded due to vibration issue and capacity oversized resulted from changing boiler operating mode. This paper will explain how to improve pump reliability by solving the 2 factors mentioned above by redesigning the impeller which reduced pump vibrations and return the pump condition back into desired operating points.

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Vanem, Erik, Arne Bang Huseby, and Bent Natvig. "A Bayesian-Hierarchical Space-Time Model for Significant Wave Height Data." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49716.

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Bad weather and rough seas contribute significantly to the risk to maritime transportation. This stresses the importance of taking severe sea state conditions adequately into account, with due treatment of the uncertainties involved, in ship design and operation. Hence, there is a need for appropriate stochastic models describing the variability of sea states. This paper presents a Bayesian hierarchical space-time stochastic model for significant wave height. The model has been fitted by data for an area in the North Atlantic ocean and aims at describing the temporal and spatial variability of significant wave height in this area. It could also serve as foundation for further extensions used for long-term prediction of significant wave height and future return periods of extreme significant wave heights. The model will be outlined in this paper, and the results will be discussed. Furthermore, a discussion of possible model extensions will be presented.

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Звіти організацій з теми "Return of serve"

Blundell, S. Micro-terrain and canopy feature extraction by breakline and differencing analysis of gridded elevation models : identifying terrain model discontinuities with application to off-road mobility modeling. Engineer Research and Development Center (U.S.), April 2021. http://dx.doi.org/10.21079/11681/40185.

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Elevation models derived from high-resolution airborne lidar scanners provide an added dimension for identification and extraction of micro-terrain features characterized by topographic discontinuities or breaklines. Gridded digital surface models created from first-return lidar pulses are often combined with lidar-derived bare-earth models to extract vegetation features by model differencing. However, vegetative canopy can also be extracted from the digital surface model alone through breakline analysis by taking advantage of the fine-scale changes in slope that are detectable in high-resolution elevation models of canopy. The identification and mapping of canopy cover and micro-terrain features in areas of sparse vegetation is demonstrated with an elevation model for a region of western Montana, using algorithms for breaklines, elevation differencing, slope, terrain ruggedness, and breakline gradient direction. These algorithms were created at the U.S. Army Engineer Research Center – Geospatial Research Laboratory (ERDC-GRL) and can be accessed through an in-house tool constructed in the ENVI/IDL environment. After breakline processing, products from these algorithms are brought into a Geographic Information System as analytical layers and applied to a mobility routing model, demonstrating the effect of breaklines as obstacles in the calculation of optimal, off-road routes. Elevation model breakline analysis can serve as significant added value to micro-terrain feature and canopy mapping, obstacle identification, and route planning.

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Malek, Mohammad Abdul, Aiko Kikkawa, Yasuyuki Sawada, and Abdul Kalam Azad. Rural Development in Bangladesh Over Four Decades: Findings from Mahabub Hossain Panel Data and the Way Forward. Asian Development Bank Institute, December 2022. http://dx.doi.org/10.56506/ppxg8315.

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The Mahabub Hossain Panel Data (MHPD) was initiated in 1988 and maintained by and named after the late Mahabub Hossain, a well-known agricultural and development economist who led a number of reputed organizations in Bangladesh (Bangladesh Institute of Development Studies and BRAC) and in the region (International Rice Research Institute). We portray the historical context, sampling evolution, survey structure and methodology, and academic and policy contributions of the MHPD with some lessons learned for the next step forward. The MHPD has tracked rural households for a period of over 3 decades (1988–2014) with five waves of household surveys covering over 2,800 households and has collected a wide range of information on household composition, schooling of household members, assets, cropping intensity and patterns including cost and return, employment and income, consumption, participation in different government and nongovernment programs. We reviewed several books and journal articles authored by Mahabub Hossain and related academic papers and documents and collated information on MHPD, including (i) mapping out information on past and ongoing panel or cross-sectional household survey data series in Bangladesh; (ii) undertaking the review of all past rounds of MHPD survey documents, such as survey implementation plans, questionnaires, codebooks, databases, and processed data; (iii) consulting relevant stakeholders, including the past implementers of the surveys and the users of the data as needed to validate documented information; (iv) taking stock of the contribution of MHPD to academic literature and policy development; and (v) drawing a number of lessons learned for future data collection and policy making. The report aims to (i) serve as a comprehensive reference document for scholars and policy makers who wish to understand MHPD for possible use in their research; and (ii) provide a comprehensive baseline from which we can consider ways to enhance MHPD further to continue contributing to understanding the economic and social issues of today and near future. By compiling all associated research work based on MHPD, we offer a historical landscape of Bangladesh’s social and economic development and a credible explanation for the Bangladesh development model for global comparison.

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Research, Gratis. The Mystery behind Bacterial Retrons. Gratis Research, December 2020. http://dx.doi.org/10.47496/gr.blog.05.

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Retron-mediated cell killing serves as a defensive strategy to prevent the spreading of phage infection in bacteria and the combined action of retron and CRISPR-based gene editing appear to be a potent gene-editing tool.

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Ainul, Sigma, Eashita Haque, K. G. Santhya, and Ubaidur Rob. Assessment of overseas labor migration systems in Bangladesh. Population Council, October 2022. http://dx.doi.org/10.31899/sbsr2022.1039.

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Bangladesh is a significant labor-sending country, with about 7.8 million Bangladeshis working abroad. Major destinations for migrant workers are the Gulf Cooperation Council (GCC) countries. Female migrants represent 12 percent of the migration flow, with a majority engaged as domestic workers. Migration to GCC countries is characterized by short-term temporary migration, migration of low- and semi-skilled workers, laborers with low literacy level, debt-financed migration, and often migration through unofficial channels. The overseas labor recruitment industry often leaves migrants susceptible to human trafficking, forced labor, and modern slavery. Also, many migrants return empty-handed and with huge debt. The Population Council in partnership with the Global Fund to End Modern Slavery (GFEMS) undertook a study to better understand survivors’ and stakeholders’ perspectives on the kinds of policies, programs, and initiatives that could facilitate safer overseas labor migration for Bangladeshi migrant workers. A qualitative study was conducted with returned migrants in Faridpur and Munshiganjs, Bangladesh. These locations also served as an assessment of an intervention for economic and social reintegration. A stakeholder consultation provided an opportunity for participants to reflect on the study findings and brainstorm about research, program gaps, and recommendations.

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Soloviev, V., and V. Solovieva. Quantum econophysics of cryptocurrencies crises. [б. в.], 2018. http://dx.doi.org/10.31812/0564/2464.

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From positions, attained by modern theoretical physics in understanding of the universe bases, the methodological and philosophical analysis of fundamental physical concepts and their formal and informal connections with the real economic measuring is carried out. Procedures for heterogeneous economic time determination, normalized economic coordinates and economic mass are offered, based on the analysis of time series, the concept of economic Plank's constant has been proposed. The theory has been approved on the real economic dynamic's time series, related to the cryptocurrencies market, the achieved results are open for discussion. Then, combined the empirical cross-correlation matrix with the random matrix theory, we mainly examine the statistical properties of cross-correlation coefficient, the evolution of average correlation coefficient, the distribution of eigenvalues and corresponding eigenvectors of the global cryptocurrency market using the daily returns of 15 cryptocurrencies price time series across the world from 2016 to 2018. The result indicated that the largest eigenvalue reflects a collective effect of the whole market, practically coincides with the dynamics of the mean value of the correlation coefficient and very sensitive to the crisis phenomena. It is shown that both the introduced economic mass and the largest eigenvalue of the matrix of correlations can serve as quantum indicator-predictors of crises in the market of cryptocurrencies.

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Fort, Ricardo, Mauricio Espinoza, and Álvaro Espinoza. COVID-19 y las migraciones de la ciudad al campo en el Perú: Identificación de amenazas y oportunidades para el uso sostenible del capital natural (Resumen). Edited by Paloma Marcos Morezuelas, Carlos Javier Puig, Jaime Fernández-Baca, Ana Saori Iju Fukushima, Santiago Bucaram, and María Jimena Romero. Inter-American Development Bank, December 2021. http://dx.doi.org/10.18235/0003822.

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El Perú es uno de los países más fuertemente golpeados por la pandemia del COVID-19 en el mundo. El confinamiento nacional obligatorio que empezó a regir a mediados de marzo de 2020 y fue ampliado en varias oportunidades hasta finales de junio del mismo año, trajo como consecuencia la paralización de diversos sectores económicos y un aumento de la tasa de desempleo de los más altos niveles históricos. Ante esta situación, que ha afectado principalmente a hogares de bajos recursos en las zonas más pobres de la capital y otras ciudades, muchos de ellos se vieron en la necesidad de emprender una migración de retorno a sus localidades de origen donde pudieran encontrar mejores condiciones para enfrentar la crisis. El presente estudio analiza la dinámica de esta migración de retorno hacia zonas rurales durante el año 2020 utilizando información censal y registros de llegada de retornantes, para luego entrevistar a más de 3 mil hogares en 19 provincias y 77 distritos que presentaban los mayores flujos. En base a esta información, estimamos que alrededor de un cuarto de millón de personas, en su mayoría jóvenes solteros, con educación secundaria completa, y de emigración reciente, han retornado a sus lugares de origen rural con intención de quedarse de manera permanente. Este panorama genera una situación sin precedentes en la historia del Perú: una migración masiva de la ciudad al campo que crea presiones demográficas con consecuencias potencialespositivas y negativasen los ámbitos político, económico, social y ambiental de las localidades receptoras. Centrándose en este último tema, el estudio postula una serie de recomendaciones de política para amortiguar los posibles impactos negativos del retorno en la sostenibilidad ambiental de aquellos distritos con mayores vulnerabilidades ecosistémicas, con énfasis en la creación de empleos verdes que apoyen la recuperación sostenible.

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Jeong, Stephen, Sarah Stawiski, Sol Bukin, and Heather Champion. Stemming the Great Resignation through Leadership Development. Center for Creative Leadership, 2022. http://dx.doi.org/10.35613/ccl.2022.2051.

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The recent rise in voluntary turnover has sparked a renewed focus on attracting and retaining talent. In their attempts to stem the tide of the Great Resignation, organizations are augmenting traditional retention strategies – e.g., higher pay, enhanced benefits, more opportunities for career advancement etc. – with remote and hybrid work schedules brought about by the COVID pandemic. Given its inherent appeal to both employees and organizations, leadership development (LD) opportunities have long been believed to play a crucial role in helping to attract and retain employees. While the body of existing correlational research does point to a positive relationship between LD opportunities and retention, there is scant research that elucidates the mechanism(s) that may help to bridge the two. Guided by existing research, this paper examined Center for Creative Leadership’s large database of program evaluation data to uncover those potential mechanisms. We found preliminary support for three specific outcomes of leadership development that may serve as potential mediators linking LD with retention; they include enhanced self-efficacy, meaningful connections, and capacity to engage followers. We conclude with implications of these findings for future research as well as some caveats related to our investigation.

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Stavland, Arne, Siv Marie Åsen, Arild Lohne, Olav Aursjø, and Aksel Hiorth. Recommended polymer workflow: Lab (cm and m scale). University of Stavanger, November 2021. http://dx.doi.org/10.31265/usps.201.

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Polymer flooding is one of the most promising EOR methods (Smalley et al. 2018). It is well known and has been used successfully (Pye 1964; Standnes & Skjevrak 2014; Sheng et al. 2015). From a technical perspective we recommend that polymer flooding should be considered as a viable EOR method on the Norwegian Continental Shelf for the following reasons: 1. More oil can be produced with less water injected; this is particularly important for the NCS which are currently producing more water than oil 2. Polymers will increase the aerial sweep and improve the ultimate recovery, provided a proper injection strategy 3. Many polymer systems are available, and it should be possible to tailor their chemical composition to a wide range of reservoir conditions (temperature and salinity) 4. Polymer systems can be used to block water from short circuiting injection production wells 5. Polymer combined with low salinity injection water has many benefits: a lower polymer concentration can be used to reach target viscosity, less mechanical degradation, less adsorption, and a potential reduction in Sor due to a low salinity wettability effect. There are some hurdles when considering polymer flooding that needs to be considered: 1. Many polymer systems are not at the present considered as green chemicals; thus, reinjection of produced water is needed. However, results from polymer degradation studies in the IORCentre indicates that a. High molecular weight polymers are quickly degraded to low molecular weight. In case of accidental release to the ocean low molecular weight polymers are diluted and the lifetime of the spill might be quite short. According to Caulfield et al. (2002) HPAM is not toxic, and will not degrade to the more environmentally problematic acrylamide. b. In the DF report for environmental impact there are case studies using the DREAM model to predict the transport of chemical spills. This model is coupled with polymer (sun exposure) degradation data from the IORCentre to quantify the lifetime of polymer spills. This approach should be used for specific field cases to quantify the environmental risk factor. 2. Care must be taken to prepare the polymer solution offshore. Chokes and vales might be a challenge but can be mitigating according to the results from the large-scale testing done in the IORCentre (Stavland et al. 2021). None of the above-mentioned challenges are server enough to not consider polymer flooding. HPAM is neither toxic, nor bio-accumulable, or bio-persistent and the CO2 footprint from a polymer flood may be significantly less than a water flood (Dupuis et al. 2021). There are at least two contributing factors to this statement, which we will return in detail to in the next section i) during linear displacement polymer injection will produce more oil for the same amount of water injected, hence the lifetime of the field can be shortened ii) polymers increase the arial sweep reducing the need for wells.

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