Academic literature on the topic 'Archey's frog'
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Journal articles on the topic "Archey's frog"
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Green, David M. "Chromosome Polymorphism in Archey's Frog (Leiopelma archeyi) from New Zealand." Copeia 2002, no. 1 (February 2002): 204–7. http://dx.doi.org/10.1643/0045-8511(2002)002[0204:cpiasf]2.0.co;2.
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Ocock, Joanne. "What Role Do Threatened Species Lists Play in New Zealand Conservation?" Pacific Conservation Biology 14, no. 4 (2008): 244. http://dx.doi.org/10.1071/pc080244.
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Threatened species' lists have been consistently reviewed as easily misused, inappropriately applied, counterproductive, and reflecting changes in knowledge more often than changes in threat status (Burgman, 2002; de Grammont and Cuaron, 2006; Possingham et al., 2002; Seminoff and Shanker, 2008). However, with limited resources to deal with endangered species, effective conservation decision-making needs a means of determining where priorities lie. The EDGE list of the world's most ?Evolutionary Distinct? and ?Globally Endangered? amphibians ranks New Zealand's endemic Archey's Frog Leiopelma archeyi at the top of its list (www.edgeofexistence.org/ amphibians/top_100.php). What role should this ranking or any other threatened species list play in determining conservation priorities in New Zealand?
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Bell, Ben D., Scott Carver, Nicola J. Mitchell, and Shirley Pledger. "The recent decline of a New Zealand endemic: how and why did populations of Archey's frog Leiopelma archeyi crash over 1996–2001?" Biological Conservation 120, no. 2 (November 2004): 189–99. http://dx.doi.org/10.1016/j.biocon.2004.02.011.
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Shaw, Stephanie, Richard Speare, Denis H. Lynn, Gregor Yeates, Zeng Zhao, Lee Berger, and Richard Jakob-Hoff. "Nematode and Ciliate Nasal Infection in Captive Archey's Frogs (Leiopelma archeyi)." Journal of Zoo and Wildlife Medicine 42, no. 3 (September 2011): 473–79. http://dx.doi.org/10.1638/2010-0180.1.
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Bishop, PJ, R. Speare, R. Poulter, M. Butler, BJ Speare, A. Hyatt, V. Olsen, and A. Haigh. "Elimination of the amphibian chytrid fungus Batrachochytrium dendrobatidis by Archey’s frog Leiopelma archeyi." Diseases of Aquatic Organisms 84 (March 9, 2009): 9–15. http://dx.doi.org/10.3354/dao02028.
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Shaw, SD, L. Berger, C. Harvey, MR Alley, PJ Bishop, and R. Speare. "Adenomatous hyperplasia of the mucous glands in captive Archey’s frogs (Leiopelma archeyi)." New Zealand Veterinary Journal 65, no. 3 (November 30, 2016): 140–46. http://dx.doi.org/10.1080/00480169.2016.1255158.
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Roy, Jolly, and Edin Suwarganda. "Archery: Emotion Intensity Regulation to Stay in the Zone during Olympic Competition." International Journal of Psychological Studies 7, no. 4 (October 28, 2015): 70. http://dx.doi.org/10.5539/ijps.v7n4p70.
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<p>Understanding emotional influence that affect sport performance in archery helps to design the appropriate intervention in athlete’s preparation. The present study examined the effect of emotion intensity from four Olympic level recurve archers on error scores and performance outcomes; compared individual emotion intensities of three competing archers during Olympic competition with previously established individual optimal zone; and examined the influence of being “in or out of individual zone” relating the archer’s achievement with the individual target set by the coach and performance outcome during Olympic competition. The results revealed that unpleasant dysfunctional emotion (N-) had the most influence on performance score. The in-out of zone results derived from the archers data lend support to emotion-performance relationship.</p>
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Wan Ahmad, Wan Nurlisa, Mohd Azrul Hisham Mohd Adib, Irdayanti Mat Nashir, Mon Redee Sut Txi, Fatin Nurfatehah Mat Salleh, and Jing Rui Tang. "Anxiety status of junior archers in COVID-19 during training isolation period towards the shooting performance." International Journal of Public Health Science (IJPHS) 12, no. 1 (March 1, 2023): 361. http://dx.doi.org/10.11591/ijphs.v12i1.21982.
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<p>Studies have indicated that the COVID-19 pandemic has had miserable effects on athlete performance due to the movement control order (MCO) announced by the Malaysia Government. Dealing with self-training without the coach's guidance leads the archers to lose concentration, diminished self-confidence, and elevated anxiety levels. These factors contribute to inconsistent shooting performance. This study attempted to identify the archer's anxiety status during the training isolation period on the shooting performance. A total of 32 participants from the recurve archery category were recruited and enrolled in a web-based cross-sectional study during the MCO. The CSAI-2R instrument was applied to participants to examine the psychological aspect. Training Isolation resulted in a significant effect on anxiety status and shooting performance. Analysis from CSAI-2R, low-level archers, indicated 5% more anxiety than top-level archers for both cognitive and somatic anxiety sub-component. In contrast, Top archers revealed a higher self-confidence mean of 2.32 (moderately high) than low archers (1.38). The result shows improvement in anxiety and score performance with complete online monitoring and coaching supervision first session until the 8th session. These findings could assist sports institutions in improving a better training experience and understanding the pandemic's impact on athletes' mental health during home isolation.</p>
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Mohd Saleh, Maisarah, Adam Linoby, Fatin Aqilah Abdul Razak, Nurul Ain Abu Kasim, and Nur Atikah Mohamed Kassim. "THE RELATIONSHIP BETWEEN ARM MUSCLE STRENGTH, MUSCLE ENDURANCE, BALANCE AND DRAW FORCE LENGTH ON ARCHERY PERFORMANCE." Malaysian Journal of Sport Science and Recreation (MJSSR) 18, no. 1 (March 15, 2022): 83. http://dx.doi.org/10.24191/mjssr.v18i1.17642.
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Archery is a type of sport which participants release the arrow after aiming the target. The shot of an arrow must be accurate to the highest score on the target face. Purpose: The purpose of this study was to determine the most the most contributing variable in archery performance. Methodology: A total of 31 females and males, aged between 13 – 18 years old from Pusat Latihan Negeri Unit Sukan Prestasi Tinggi, Majlis Sukan Negeri, Negeri Sembilan participated in this study. They were involved in different level of achievement in archery competition, ranging from beginner until expert archers. They were also free from any injuries. The participants engaged in three test, which were arm muscle strength test, push-up test, stork balance stand test. Result: The Pearson correlation analysis showed there was significant relationship among variable measured. In addition, regression analysis showed the arm muscle strength and muscle endurance were the most contributed variable in archery performance. Findings and discussion: These elements can be indicators of an archer’s skill level and can be applied as important parameter to select potential archers and also assessment of archer’s performance. The time taken to develop the archer to become an expert archer can be shortening due to focusing on important variables.
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Park, James L. "Optimising an archer’s foot position to obtain a competitive advantage." Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology 233, no. 3 (March 2019): 402–7. http://dx.doi.org/10.1177/1754337119830569.
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The World Archery shooting rules provide some latitude in relation to an archer’s position on the shooting line. This means that the archer could stand at different distances from the target, while still meeting competition regulations. One would think that standing closer to the target should be an advantage; however, most archers do not take this approach. This article considers the score increase that may be attributable to standing in the optimum position, which can lead to a potential higher ranking place at major international indoor and outdoor archery competitions.
Dissertations / Theses on the topic "Archey's frog"
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Ferrero, Chiara. "Structural behaviour of masonry arches on moving supports : from on-site observation to experimental and numerical analysis." Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/672366.
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Since ancient times, master builders have used arches to cover large spans in masonry structures. As a consequence, nowadays the safety assessment of these structural elements plays a fundamental role in the conservation of built cultural heritage.
Due to their frequent occurrence, support displacements are one of the primary sources of damage for masonry arches. Among the potential causes of support displacements, slow-moving landslides have received very little attention from the scientific community. The present thesis is motivated by the observation of extensive and severe damage in the arches of historic masonry churches exposed to slow-moving landslides. These phenomena produce a combination of vertical and horizontal supports displacements, whose effect on the arch structural behaviour has never been thoroughly investigated in the literature, especially in the framework of large displacements.
In view of the above, this thesis aims at providing a full understanding of the mechanics of masonry arches subjected to large support displacements, with special attention to inclined displacements. The methodology used to accomplish this goal included both experimental tests and numerical analyses on a segmental scaled dry-joint masonry arch subjected to different combinations of horizontal and vertical support displacements.
The numerical simulations were carried out in the framework of large displacements using two different numerical approaches based on finite element (FE) and rigid block (RB) modelling. A micro-modelling strategy was adopted, where the arch was modelled as an assemblage of voussoirs, very stiff and infinitely resistant in compression in the FE model and rigid in the RB model, interacting at no-tension friction interfaces. Preliminary numerical simulations, aimed at designing the experimental set-up and gaining a first insight in the arch response, were carried out considering the arch as a rigid-no tension structure. To this aim, a very large value of interface normal stiffness was adopted in the FE model.
A large experimental campaign was performed on a 1:10 small-scale model built as a dry-joint assemblage of voussoirs made of a bicomponent composite material. The results of the tests allowed, for the first time in the literature, to accurately assess the effect of the direction of the imposed support displacements on the arch response in the framework of large displacements. The comparison between numerical and experimental results showed that the numerical models were not able to accurately predict the experimental response. To investigate this discrepancy, a sensitivity analysis on the effect of the interface normal stiffness on the FE predictions was performed. The results demonstrated that the difference between numerical and experimental results could be attributed due to the imperfections, and resulting deformability, of the joints of the physical model. A strategy to include imperfections in the numerical modelling, consisting in calibrating the interface normal stiffness based on the experimental results, was thus proposed and validated by performing further FE simulations, whose results were in very good agreement with the experimental evidence.
Finally, to investigate the effect of geometrical imperfections on the arch response, a further experimental test was performed on a physical model made of bicomponent composite voussoirs exhibiting more imperfections. The test was simulated using a FE calibrated model to further validate the strategy proposed to model imperfections. The comparison between the experimental results for the two tested physical models showed that imperfections play a fundamental role in the response of small-scale arches to large support displacements. Furthermore, reducing the interface normal stiffness with respect to the large value adopted to model rigid interfaces proved to be an effective strategy to simulate the amount of imperfections of the experimental models.Desde la antigüedad, los maestros constructores han utilizado el arco como elemento estructural para salvar grandes luces en estructuras de mampostería. En consecuencia, para la conservación del patrimonio arquitectónico es hoy en día de fundamental importancia la correcta verificación estructural de este tipo de elementos. Se ha observado frecuentemente que el desplazamiento de los apoyos es una de las principales causas de daño en arcos de mampostería. De entre las distintas causas que pueden provocar dicho desplazamiento, el deslizamiento de tierras ha recibido poca atención por parte de la comunidad científica. La presente tesis encuentra su motivación en el daño extenso y severo observado en los arcos de las iglesias de mampostería ubicadas en zonas expuestas a deslizamiento de tierras. Este fenómeno produce una combinación de desplazamientos verticales y horizontales, cuyo efecto en el comportamiento estructural de los arcos no ha sido investigado en profundidad, especialmente en lo relativo a grandes desplazamientos. Esta tesis aspira a contribuir al conocimiento del comportamiento mecánico de los arcos de mampostería sometidos a grandes desplazamientos de apoyos, con especial atención a los desplazamientos inclinados. La metodología utilitzada para dicho fin incluye ensayos experimentales y análisis numéricos en un modelo a escala de un arco de mampostería a junta seca. El modelo fue ensayado bajo diferentes combinaciones de desplazamientos horizontales y verticales en uno de sus apoyos. La simulación numérica fue desarrollada en el marco de grandes desplazamientos usando dos métodos numéricos diferentes: un modelo de elementos finitos (FE) y un modelo de bloques rígidos (RB). Los modelos fueron concebidos como un conjunto de dovelas rígidas con infinita resistencia a compresión en el modelo FE y como dovelas infinitamente rígidas en el modelo RB. En ambos modelos la interfaz entre dovelas fue modelada sin resistencia a tracción. Con el objetivo de diseñar la configuración experimental y adquirir una comprensión inicial de la respuesta del arco, se llevaron a cabo simulaciones numéricas preliminares en las cuales se consideró al arco estudiado como una estructura rígida. Para ello en el modelo FE del arco, la rigidez normal de la interfaz fue inicialmente caracterizada con un valor muy elevado. La campaña experimental fue llevada a cabo en modelos a escala 1:10. Los resultados de los ensayos experimentales permitieron, por primera vez en la literatura, un análisis preciso del efecto que tiene la dirección del desplazamiento impuesto en el comportamiento del arco en marco de grandes desplazamientos. La comparaci ón entre los resultados numéricos y experimentales mostró que los modelos numéricos no eran capaces de capturar de manera precisa la respuesta experimental. Para investigar esta discrepancia, se realizó un estudio de sensibilidad relativo al efecto de la rigidez normal de la interfaz sobre las predicciones del modelo FE. Los resultados demostraron que la diferencia entre los resultados numéricos y experimentales se debía a las imperfecciones de las juntas del modelo físico. Como consecuencia, se propuso la inclusión de imperfecciones en el modelo numérico. Para ello se calibró la rigidez normal de la interfaz según los resultados experimentales y el modelo se validó con nuevas simulaciones. Finalmente, con el fin de investigar el efecto de las imperfecciones en la respuesta del arco, se llevó a cabo otro ensayo con el mismo modelo experimental, pero añadiéndole imperfecciones. El ensayo fue simulado con un modelo calibrado FE. Los resultados obtenidos mostraron que las imperfecciones juegan un rol fundamental en la respuesta de arcos a pequeña escala con grandes desplazamientos en los apoyos. Además, la reducción de la rigidez normal de la interfaz con respecto al valor muy elevado inicialmente adoptado demostr ó ser una estrategia efectiva para simular las imperfecciones de los modelos experimentales.
Fin dall’antichità, i maestri costruttori hanno utilizzato gli archi per coprire grandi luci nelle strutture in muratura. Di conseguenza, ad oggi la valutazione della sicurezza di questi elementi strutturali gioca un ruolo fondamentale nella conservazione del patrimonio architettonico. A causa del loro frequente verificarsi, gli spostamenti degli appoggi sono una delle principali fonti di danno per gli archi in muratura. Tra le potenziali cause di questi spostamenti, le frane a cinematica lenta hanno ricevuto pochissima attenzione da parte della comunità scientifica. La presente tesi è motivata dall'osservazione di danni ingenti negli archi di chiese storiche in muratura interessate da frane a cinematica lenta. Questi fenomeni producono una combinazione di spostamenti verticali e orizzontali agli appoggi, il cui effetto sul comportamento strutturale dell'arco non è mai stato studiato a fondo in letteratura, soprattutto nell’ambito di grandi spostamenti. Alla luce di queste osservazioni, questa tesi si propone di fornire una piena comprensione della meccanica degli archi in muratura soggetti a grandi spostamenti degli appoggi, con particolare attenzione agli spostamenti inclinati. La metodologia utilizzata per raggiungere questo obiettivo ha incluso sia prove sperimentali che analisi numeriche su un arco ribassato in muratura di giunti a secco in piccola scala, in cui sono state applicate diverse combinazioni di spostamenti orizzontali e verticali in corrispondenza di un appoggio. Le simulazioni numeriche sono state eseguite nell’ambito dei gradi spostamenti utilizzando due diversi approcci numerici basati su una modellazione ad elementi finiti (FE) ed una modellazione a blocchi rigidi (RB). È stata adottata una strategia di micro-modellazione, in cui l'arco è stato modellato come un assemblaggio di blocchi, molto rigidi e infinitamente resistenti a compressione nel modello FE e infinitamente rigidi nel modello RB. In entrambi i modelli i blocchi erano collegati da interfacce senza resistenza a trazione. Simulazioni numeriche preliminari, finalizzate a progettare il set-up sperimentale e ad acquisire una prima conoscenza della risposta dell'arco, sono state eseguite considerando l'arco come una struttura rigida non resistente a trazione. A tal fine, nel modello FE è stato adottato un valore molto elevato di rigidezza normale delle interfacce. Un’ampia campagna sperimentale è stata eseguita su un modello in scala 1:10 costruito come un assemblaggio a secco di blocchi realizzati con un materiale composito bicomponente. I risultati delle prove sperimentali hanno permesso, per la prima volta in letteratura, di valutare con precisione l'effetto della direzione degli spostamenti imposti sulla risposta dell'arco nell’ambito dei grandi spostamenti. Il confronto tra i risultati numerici e sperimentali ha mostrato che i modelli numerici non erano in grado di cogliere in maniera accurata la risposta sperimentale, specialmente in termini di spostamento ultimo al collasso. Al fine di indagare le ragioni di questa discrepanza, è stata quindi eseguita un'analisi di sensitività relativa all’effetto della rigidezza normale delle interfacce sulle previsioni del modello FE. I risultati hanno dimostrato che la differenza tra risultati numerici e sperimentali poteva essere attribuita alle imperfezioni, e conseguente deformabilità, delle interfacce del modello fisico. Una strategia per includere le imperfezioni nella modellazione numerica, consistente nel calibrare la rigidezza normale delle interfacce sulla base dei risultati sperimentali, è stata quindi proposta e validata attraverso ulteriori simulazioni FE, i cui risultati si sono rivelati in ottimo accordo con le evidenze sperimentali. Infine, per indagare l'effetto delle imperfezioni geometriche sulla risposta dell'arco, è stata eseguita un’ulteriore prova sperimentale su un modello fisico costituito da blocchi dello stesso materiale composito bicomponente che presentavano però più imperfezioni. Al fine di validare ulteriormente la strategia proposta per modellare le imperfezioni, la prova sperimentale è stata simulata utilizzando un modello FE calibrato. Il confronto tra i risultati sperimentali per i due modelli fisici ha mostrato che le imperfezioni giocano un ruolo fondamentale nella risposta di archi in piccola scala a grandi spostamenti degli appoggi. Inoltre, ridurre la normale rigidezza dell'interfaccia rispetto al valore molto alto adottato per modellare interfacce rigide si è rivelata una strategia efficace per simulare la quantità di imperfezioni dei modelli sperimentali
Enginyeria de la construcció
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FERRERO, CHIARA. "Structural Behaviour of Masonry Arches on Moving Supports: from On-site Observation to Experimental and Numerical Analysis." Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1049725.
Full textAbstract:
Since ancient times, master builders have used arches to cover large spans in masonry structures. As a consequence, nowadays the safety assessment of these structural elements plays a fundamental role in the conservation of built cultural heritage.
Due to their frequent occurrence, support displacements are one of the primary sources of damage for masonry arches. Among the potential causes of support displacements, slow-moving landslides have received very little attention from the scientific community. The present thesis is motivated by the observation of extensive and severe damage in the arches of historic masonry churches exposed to slow-moving landslides. These phenomena produce a combination of vertical and horizontal supports displacements, whose effect on the arch structural behaviour has never been thoroughly investigated in the literature, especially in the framework of large displacements.
In view of the above, this thesis aims at providing a full understanding of the mechanics of masonry arches subjected to large support displacements, with special attention to inclined displacements. The methodology used to accomplish this goal included both experimental tests and numerical analyses on a segmental scaled dry-joint masonry arch subjected to different combinations of horizontal and vertical displacements at one support.
The numerical simulations were carried out in the framework of large displacements using two different numerical approaches based on finite element (FE) and rigid block (RB) modelling. A micro-modelling strategy was adopted, where the arch was modelled as an assemblage of voussoirs, very stiff and infinitely resistant in compression in the FE model and rigid in the RB model, interacting at no-tension friction interfaces. Preliminary numerical simulations, aimed at designing the experimental set-up and gaining a first insight in the arch response, were carried out considering the arch as a rigid-no tension structure. To this aim, a very large value of interface normal stiffness was adopted in the FE model.
A large experimental campaign was performed on a 1:10 small-scale model built as a dry-joint assemblage of voussoirs made of a bicomponent composite material. The results of the tests allowed, for the first time in the literature, to accurately assess the effect of the direction of the imposed support displacements on the arch response in the framework of large displacements. The comparison between numerical and experimental results showed that the numerical models were not able to accurately predict the experimental response, especially in terms of ultimate displacement capacity. To investigate this discrepancy, a sensitivity analysis on the effect of the interface normal stiffness on the FE predictions was performed. The results demonstrated that the difference between numerical and experimental results could be attributed due to the imperfections, and resulting deformability, of the joints of the physical model. A strategy to include imperfections in the numerical modelling, consisting in calibrating the interface normal stiffness based on the experimental results, was thus proposed and validated by performing further FE simulations, whose results were in very good agreement with the experimental evidence.
Finally, to investigate the effect of geometrical imperfections on the arch response, a further experimental test was performed on a physical model made of bicomponent composite voussoirs exhibiting more imperfections. The test was simulated using a FE calibrated model to further validate the strategy proposed to model imperfections. The comparison between the experimental results for the two tested physical models showed that imperfections play a fundamental role in the response of small-scale arches to large support displacements. Furthermore, reducing the interface normal stiffness with respect to the large value adopted to model rigid interfaces proved to be an effective strategy to simulate the amount of imperfections of the experimental models.
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Cohen, Rhonda. "The relationship between personality, sensation seeking, reaction time and sport participation : evidence from drag racers, sport science students and archers." Thesis, Middlesex University, 2012. http://eprints.mdx.ac.uk/9871/.
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This thesis examined for the first time psychological variables namely, personality traits and reaction time amongst elite and amateur drag racers, archers and a sample of university sport science students. In study 1, using Eysenck and Eysenck’s Personality Inventory (1982) 144 drag racers (mean age 31, SD =12.27) 108 male, 36 female were compared with a control group of 82 university sport science students (mean age 22.9, SD = 2.99) 44 male, 38 female. There was a significant difference between the participants on neuroticism only. Drag racers scored lower on this scale than students who scored higher on neuroticism. In study 2, using Sensation Seeking Scale (SSS-V) (Zuckerman, 1994) data from the above 144 drag racers were compared with a control group of 82 university sport Science students. The results indicated that there were no significant differences between drag racers and university sport science students on measures of sensation seeking. Level of performance (elite versus amateur) did not distinguished drag racers from the comparison group. A significant difference in gender was found only on the subscale of disinhibition (DIS). Study 3 included archers as an appropriate group involved in a non-extreme sport. Forty-five archers (mean age 37.2, SD = 11.68) 30 male and 15 female were included in this study. The results on personality tests (EPI and SSS), whilst employing controls for age, gender and level of performance indicated that there was a significant difference between the 3 sporting groups (as well as in comparison to university sport science students) in sensation seeking, thrill and adventure seeking and disinhibition. Level of performance was shown to be a significant variable on sensation seeking and thrill and adventure seeking. Gender was a highly significant variable only on a measure of neuroticism. In study 4, an experiment was conducted on the relationship between personality traits and reaction times as a function of sporting performance. There were 29 male drag racers (mean age = 45.82, SD = 8.56), 11 female drag racers mean age (42.72, SD = 8.33), 26 male archers (mean age 35.53, SD = 11.93), 13 female archers (mean age 38.92 , SD = 11.68), 34 male students (mean age = 22.82, SD = 2.62) and 25 female students (mean age = 23.08, SD = 3.36). The issue examined was whether drag racers, archers and students differ on tests of simple (non sport specific i.e. dots on a screen) and task specific (sport related- series of lights) reaction time. These tests were designed on SuperLab specifically for drag racers. The results demonstrated that there was a significant difference between the participants (i.e. drag racers and students) in accuracy. Overall, there was a significant correlation between extraversion and accuracy on a sport specific task. With archers, there was a relationship between extraversion and accuracy and for both elite and amateurs, which was highly significant for female archers. With amateur drag racers there was an inverse relationship between sensation seeking measures and accuracy. This demonstrates the importance of level of performance as a moderating factor. The implications of these findings are discussed.
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Berthon, William. "Bioarchaeological analysis of the mounted archers from the Hungarian Conquest period (10th century) : Horse riding and activity-related skeletal changes." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEP061.
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Certaines modifications observées sur les os humains peuvent permettre de reconstituer les activités des populations anciennes. L'équitation représente notamment un intérêt particulier, ayant apporté des changements profonds et durables dans l'histoire de l'évolution culturelle humaine. Cependant, divers facteurs de biais et l'absence de données contextuelles claires liées aux restes osseux donnent souvent lieu à des interprétations limitées ou peu fiables des modifications osseuses en termes d’activités spécifiques. Les sources archéologiques et historiques attestent que des tribus de populations semi-nomades ont conquis le bassin des Carpates à l’aide d’armées de cavaliers-archers au tournant des 9ème et 10ème siècles, conduisant ainsi à la fondation du Royaume de Hongrie en l'an 1000/1001. Les cimetières de cette période fournissent des cas de dépôts de matériel lié à l’archerie et à l’équitation ainsi que des ossements de chevaux associés aux individus dans les tombes. Ces populations sont ainsi parmi les plus pertinentes pour mener des études méthodologiques sur les modifications osseuses liées aux activités, et notamment à la pratique cavalière. Nous avons sélectionné 67 individus issus du cimetière hongrois de Sárrétudvari-Hízóföld (10ème siècle), pour les analyser selon la présence ou l'absence de dépôt lié au cheval dans leurs tombes. Un échantillon moderne de comparaison de 47 individus présumés non-cavaliers a également été sélectionné au sein de la collection documentée de Lisbonne. Seuls les sujets adultes masculins ont été inclus afin de limiter l'influence de variations en lien avec le sexe et l'âge. Les objectifs étaient d’identifier des modifications squelettiques liées à la pratique cavalière et d’améliorer nos connaissances sur les populations de la Conquête hongroise. Nous avons analysé diverses modifications osseuses, au niveau des enthèses (points d'attache des muscles), articulations et vertèbres, ainsi que des variations morphologiques et lésions traumatiques. Des mesures des os des membres inférieurs ont aussi servi à calculer des indices de forme et de robustesse. Les analyses statistiques ont principalement révélé des différences significatives entre les groupes hongrois avec ou sans mobilier et le groupe de comparaison. Celles-ci concernent notamment les modifications de certaines enthèses de l’os coxal, du fémur, du tibia et du calcanéus, une adaptation morphologique sur le col du fémur, les hernies discales à la jonction thoraco-lombaire, ou encore l'ovalisation de l’acétabulum de l'os coxal. Ces traits peuvent tous être liés à la posture du cavalier et semblent donc être des indicateurs prometteurs pour la pratique cavalière. Par ailleurs, les comparaisons ont montré que les individus hongrois sans dépôt dans leur tombe montaient aussi vraisemblablement à cheval. Parmi les limitations, appelant malgré tout à la prudence, figure la taille restreinte de nos échantillons archéologiques, qui est l’un des points qui devront être améliorés à l'avenir. En outre, certaines modifications osseuses, comme celles des enthèses, ont une étiologie multifactorielle, limitant ainsi leur interprétation. À cet égard, nous avons mené l’analyse exploratoire de la microarchitecture d'une enthèse, la tubérosité du radius. À l’aide d’acquisitions micro-CT et de reconstructions 3D des canaux de l'os cortical, nous avons observé que des variations microstructurales pourraient permettre, avec des recherches supplémentaires, de distinguer les modifications des enthèses liées aux activités de celles liées à d’autres facteurs, contribuant ainsi à de plus fiables reconstructions des activités des populations anciennes. Au final, le choix d'une collection anthropologique pertinente, avec des preuves directes de la pratique d'une activité, ainsi que l'application de critères méthodologiques stricts, sont autant d’éléments déterminants pour l'identification fiable de modifications squelettiques liées aux activitésSome changes observed on human bones can be related to activities practiced during life. Scholars have considered the reconstruction of activities from skeletal changes in past populations as “Bioarchaeology’s Holy Grail”. Horse riding, in particular, has interested bioarchaeologists and paleopathologists for several decades as it brought profound and lasting changes in the history of human cultural evolution. However, the existence of various confounding factors and the lack of clear contextual evidence in connection with the skeletal remains often result in limited or unreliable interpretations of skeletal changes in terms of specific activities. Archaeological and historical sources attest that tribes of semi-nomadic populations conquered the Carpathian Basin with powerful armies of mounted archers at the turn of the 9th and 10th centuries, which led to the foundation of the Kingdom of Hungary in the year 1000/1001. Cemeteries from that period often provide cases of deposits of archery and horse riding equipment as well as horse bones associated with the individuals in the graves. Those populations are, thus, among the most pertinent to be used to perform methodological investigations on activity-related skeletal changes, and, on horse riding, in particular. We selected a sample of 67 individuals from the 10th-century Hungarian cemetery of Sárrétudvari-Hízóföld, in order to analyze the individuals according to the presence or absence of riding deposit in their grave. A modern comparison group of 47 presumed non-rider individuals from the documented collection of Lisbon was also selected. Only adult males were included to limit the effect of sex and age on the changes. The main objectives were to identify skeletal changes reliably related to the practice of horse riding and to improve our understanding of the populations from the Hungarian Conquest period. Various types of skeletal changes were analyzed, including some entheseal changes (at muscles attachment sites), joint changes, vertebral changes, morphological variants, and traumatic lesions. Measurements of the lower limb bones were also used to calculate indices of shape and robusticity. Statistical analyses mostly revealed significant differences between the Hungarian groups with or without riding deposit and the comparison group from Lisbon. They concerned especially some entheseal changes at the coxal bone, femur, tibia, and calcaneus, a morphological adaptation on the femoral neck, intervertebral disc herniations at the thoracolumbar junction, or the ovalization of the acetabulum on the coxal bone. All these traits can be linked to the riding posture, and, thus, seem to be promising indicators for the practice of horse riding. On another note, comparisons between groups revealed that the Hungarian individuals without deposit in their grave were likely riding horses as well. Among the limitations calling for caution is the restricted size of our archaeological samples, which is one of the points that should be improved in the future. In addition, some skeletal changes, such as the entheseal changes, have a multifactorial etiology, which represents a limitation for their interpretation. In that regard, we performed the exploratory analysis of the microarchitecture of an enthesis, the radial tuberosity. Using micro-CT acquisitions and 3D reconstructions of the canals of the cortical bone, we observed that some microstructural variations could allow, with further research, distinguishing entheseal changes related to activity from those related to other factors, thus contributing to more reliable reconstructions of the activities in past populations. In the end, we emphasize that the selection of a pertinent anthropological collection, with direct evidence of the practice of an activity, and the application of strict methodological criteria, are determinant factors for the reliable identification of activity-related skeletal changes
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BUTTARAZZI, MARIA ANTONIETTA. "Hystorical Rules and Theories on Masonry Arches from the Renaissance to Monasterio and Persy." Doctoral thesis, 2013. http://hdl.handle.net/11573/916758.
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Cammino storico evolutivo sulle teorie degli archi in muratura a partire dal Rinascimento fino ai primi anni del 1800.
La costruzione di questo cammino è iniziata con la rivisitazione, mediante lettura esegetica e critica, delle regole costruttive utilizzate nel Rinascimento, delle teorie pre-elastiche di La Hire, Coulomb e Mascheroni del XVIII° secolo ed infine della teoria sugli archi non simmetrici descritta da Monasterio nel suo trattato inedito, Nueva Teorica sobre el empuje de bovedas, dell’inizio del XIX° secolo e della teoria per l’individuazione dei meccanismi di collasso degli archi simmetrici di Nicolas Persy descritta nella sua raccolta di lezioni, Cours sur la stabilité des constructions, à l’usage des élèves de l’ école royale de l’Artillerie et du Génie, Stabilité des voûtes del 1825.
Nell’analisi di queste teorie, per le strutture ad arco o voltate, in blocchi lapidei o muratura, è stato adottato il modello di corpo rigido soggetto a vincoli unilaterali ed attrito, per tenere in debito conto la scarsa resistenza a trazione del materiale e la elevata resistenza a compressione.
Il modello meccanico dell’arco murario come struttura mono-dimensionale governata ai giunti da opportune leggi di contatto normale e tangenziale.
La cinematica, la statica e la cinetica del sistema possono così essere definite, permettendo di individuare in condizioni di equilibrio stabile i range delle reazioni staticamente ammissibili come funzione della spinta in chiave.
La filosofia che soggiace ad un tale approccio per l’analisi delle strutture voltate lapidee o murarie consente di riabilitare la validità delle teorie pre-elastiche sulle strutture voltate lapidee o murarie.
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Yu, Chih-Lung, and 余志隆. "A Study of How Olympic Student Archers from Taiwan Have Achieved from Taiwan Have Achieved both Academic and Athletic Success." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/12268688466438680894.
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碩士國立體育大學
運動技術研究所
100
The purpose of this study was to analyze the archery training process ant the academic learning process of Taiwan’s outstanding student archers so as to understand how they can engage in effective academic learning and athletic training. Using qualitative research, I collected data from three Olympic student archers with great sporting achievements and master’s degrees. One of them is pursuing a doctoral degree. Data collection includes semi-structured interviews, training and competition photos of the interviewees, photos and documents of the interviewees participating in symposiums and related disciplines activities. Through open coding of data collected and analyzed, participants’ inspection, and triangulation, the credibility of this study was established. The results were as follows: (1) All the interviewees have archery talent. (2) They are committed to sharpening their archery skills. (3) They reflect all the time. (4) They demonstrate the ability of efficient time control. They invest their time wisely in learning and training. (5) Due to a weak academic base, they face the challenge of role conflict when entering the doctoral stage. They have to choose between academics and athletics. They even have to make a choice between retirement from athletics and leave of absence from school.
Books on the topic "Archey's frog"
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Milani, Gabriele, and Vasilis Sarhosis, eds. From Corbel Arches to Double Curvature Vaults. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12873-8.
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Fowler, Donald D. The Archers, an old Virginia family--including the allied families from George Archer to Elizabeth Archer Fowler, 1636-1989: A history. Alexandria, Va: D.D. Fowler, 1989.
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Leonardo, Romero, Walsh, Michael (Comic book artist), Bellaire Jordie, Sabino Joe, Tedesco Julian Totino ill, and Thompson Kelly 1976-, eds. Hawkeye: Anchor points. New York, NY: Marvel Worldwide, Incorporated, 2017.
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Ltd, Shaw &. Sons. Archer's Compound Interest & Annuity Tables: Rates from One-Half to 3 Percent (Archer's Compound Interest & Annuity Tables). Hyperion Books, 1988.
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(Contributor), Peter Barkworth, ed. Four Short Stories from Jeffrey Archer's a Quiver Full of Arrows. DH Audio, 1987.
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Niles, Emoke. Arches of Sky: Selections from the Poetry. Authorhouse, 2001.
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Arch of Titus: From Jerusalem to Rome--And Back. BRILL, 2021.
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Johnson, Robert. Archer's Revenge : A story from the Hundred Years War: The Battle of Poitiers. CreateSpace Independent Publishing Platform, 2011.
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How Delicate These Arches: Footnotes from the Four Corners. Ravens Eye Press LLC, 2011.
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Momentary songs: They that are delivered from the noise of the archers. San Francisco, CA: Krupskaya, 2008.
Find full textBook chapters on the topic "Archey's frog"
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García, Julián, Carlos Martín, Roberto Molinos, Joaquín Grau, and Juan Manuel Pérez. "Digital Setting Out Techniques for Tile Vaults Without Formwork." In From Corbel Arches to Double Curvature Vaults, 61–78. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12873-8_4.
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Torre, Stefano Della, and Lorenzo Cantini. "Historical Review of Masonry Arches and Vaults. Trends in Historic Preservation and the Relevance of Understanding Curved Masonry Structures." In From Corbel Arches to Double Curvature Vaults, 21–38. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12873-8_2.
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Grillanda, Nicola, Andrea Chiozzi, and Gabriele Milani. "NURBS-Based Limit Analysis of Masonry Vaults." In From Corbel Arches to Double Curvature Vaults, 205–31. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12873-8_8.
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Yuan, Yu, Gabriel Stockdale, and Gabriele Milani. "Survey and Monitoring Methods for Masonry Arches and Vaults." In From Corbel Arches to Double Curvature Vaults, 39–60. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12873-8_3.
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Ramage, Michael H., Ana Gatóo, and M. Wesam Al Asali. "Complex Simplicity—Design of Innovative Sustainable Thin-Shell Masonry Structures." In From Corbel Arches to Double Curvature Vaults, 257–81. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12873-8_10.
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Lemos, José V., Francesca Gobbin, Tamás Forgács, and Vasilis Sarhosis. "Discrete Element Modelling of Masonry Arch Bridges, Arches and Vaults." In From Corbel Arches to Double Curvature Vaults, 233–56. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12873-8_9.
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Milani, Gabriele, and Vasilis Sarhosis. "Introduction." In From Corbel Arches to Double Curvature Vaults, 1–20. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12873-8_1.
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Hua, Yiwei, and Gabriele Milani. "Rigid Block Limit Analysis of Masonry Arches with Associated and Non-associated Slides." In From Corbel Arches to Double Curvature Vaults, 169–203. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12873-8_7.
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Bianchini, Nicoletta, Angelo Gaetani, Nuno Mendes, and Paulo B. Lourenço. "Experimental Behaviour of Masonry: Static and Dynamic Behaviour of Arches and Vaults." In From Corbel Arches to Double Curvature Vaults, 79–121. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12873-8_5.
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Aita, Danila. "Revisiting Classic Methods for the Equilibrium Analysis of Masonry Arches and Domes." In From Corbel Arches to Double Curvature Vaults, 123–68. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12873-8_6.
Full textConference papers on the topic "Archey's frog"
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PERDEREAU, O. "RESULTS FROM THE ARCHEOPS CMB EXPERIMENT." In Proceedings of the MG10 Meeting held at Brazilian Center for Research in Physics (CBPF). World Scientific Publishing Company, 2006. http://dx.doi.org/10.1142/9789812704030_0157.
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Alsheghri, Ammar, Farnoosh Ghadiri, Ying Zhang, Olivier Lessard, Julia Keren, Farida Cheriet, and François Guibault. "Semi-supervised segmentation of tooth from 3D scanned dental arches." In Image Processing, edited by Ivana Išgum and Olivier Colliot. SPIE, 2022. http://dx.doi.org/10.1117/12.2612655.
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Zeller, Marc, Kai Hofig, and Jean-Pascal Schwinn. "ArChes — Automatic generation of component fault trees from continuous function charts." In 2017 IEEE 15th International Conference on Industrial Informatics (INDIN). IEEE, 2017. http://dx.doi.org/10.1109/indin.2017.8104836.
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Cacace, D., V. Corlito, M. Zizi, G. De Matteis, and P. Roca. "Seismic Behaviour Analysis of Diaphragm Arches: Case Studies from Catalan Gothic Churches." In 12th International Conference on Structural Analysis of Historical Constructions. CIMNE, 2021. http://dx.doi.org/10.23967/sahc.2021.224.
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Mahajan, V. M. "On the deformation of layered composite arches using exponential shear and normal deformation theory." In Advanced Topics in Mechanics of Materials, Structures and Construction. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902592-71.
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Abstract. In the present study, the stresses and displacements are analyzed for layered composite arches of various lamination schemes subjected to uniformly loading. The present work is majorly highlighted the effects of transverse normal stress and transverse normal strain using exponential shear and normal deformation theory (ESNDT). Governing equations are derived using Hamilton’s principle with application of Navier’s method subjected to simply supported end conditions. Present theory is free from use of any shear correction factor and it satisfies the zero traction free end boundary condition at the top and bottom surfaces of the layered composite arches. In the present work symmetric and antisymmetric lamination scheme have been studied to obtain the numerical results for four layered composite arches and is validated through results available in prior literature.
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Werner, Jonathan, Navan Chawla, Misha Vickar, and Matthias Peltz. "Evaluation of Non-Prismatic Open Cross-Section Bridge Arch for the Toronto Port Lands Bridges." In IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.1511.
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<p>The Cherry St North, Commissioners St, and Cherry St South bridges are a series of four signature steel tied arch bridges located in Toronto, Canada. The bridges are being constructed over the Keating Channel and a new extension of the Don River. The arch legs of the bridges are composed of non-prismatic open sections using curved plates. The centre domes at the tops of the arches are also composed of open steel plate sections with plates in double curvature. Steel plate hanger from the arches to the closed steel box tie girders serve to transfer the superstructure gravity loads to the arches. The in-plane and out-of-plane structural stability of the non-prismatic open section arch legs required detailed consideration during design. This paper discusses the various approaches used to analyse and design the arch legs, including the use of approximate methods.</p>
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Burkhard, Lukas, Ryo Sakagami, Kristin Lakatos, Heinrich Gmeiner, Peter Lehner, Josef Reill, Marcus G. Müller, Maximilian Durner, and Armin Wedler. "Collaborative Multi-Rover Crater Exploration: Concept and Results from the ARCHES Analog Mission." In 2024 IEEE Aerospace Conference. IEEE, 2024. http://dx.doi.org/10.1109/aero58975.2024.10521301.
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Maharana, Priyabrata, Ahmad Shaikh, and G. K. Ananthasuresh. "Dynamic Offloading and Selective Redistribution of Plantar Pressure Using Connected Shallow Arches." In ASME 2023 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/detc2023-116444.
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Abstract Current practice of designing therapeutic footwear for managing the neuropathic foot relies on static offloading in two ways. One way is to relieve vulnerable portions of the plantar region from contact by pocketing out specific portions of the insole. The other is to contour the insole to evenly distribute pressure across the plantar region. Both methods have proven to be effective, but the footwear cannot adapt to altered gait over an extended period of use leading to complications such as transfer ulcers. This can be attributed to the premise of “static” offloading. In this paper, we present an alternative method aimed at dynamic offloading that adapts to changing gait of the user. We achieve this by suitably redistributing the plantar pressure by using a pair of arches of opposite curvature connected with a hinge that creates a see-saw-like motion. This is a significant advancement over our previous, clinically validated, prototype consisting of individual snap-through arches that dynamically offload but do not transfer the pressure to another region. In contrast, the connected arches are designed such that no part of the plantar region experiences more than a prescribed threshold pressure at any time over a long period of use. This is enabled by a design methodology that uses closed-form analytical criteria for deciding if the arches can seesaw or attain a second stable state until the loading is reversed. We analytically designed an array of connected, snap-through and bistable arches for the entire plantar region to dynamically redistribute plantar pressure. We also built a musculoskeletal model of the foot comprising bones, ligaments, muscle forces, and enclosing soft tissue, and used it to computationally validate the efficacy of the novel therapeutic footwear. The results of computational validation are useful to obtain ethical approvals for clinical validation and eventual clinical trials.
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Krivonos, Roman. "NuSTAR observation of the Arches cluster: X-ray spectrum extraction from a 2D image." In 11th INTEGRAL Conference Gamma-Ray Astrophysics in Multi-Wavelength Perspective. Trieste, Italy: Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.285.0078.
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Vandenbergh, Alex. "Terra Cotta Flat Arches: A Historic Modern-Day Challenge." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.2542.
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<p>At the turn of the 20th century, terra cotta flat arches (TCFA’s) were a popular floor system in steel framed buildings for industrial and office construction in the United States. These arches were lighter but just as fireproof as standard brick arches, and were designed empirically using proprietary allowable load tables, which were based mostly on load testing.</p><p>In the 21st century, the proprietary nature of the TCFA makes evaluating these systems problematic for the modern engineer, architect, and contractor. Renovations of buildings with TCFA floor assemblies typically will have new penetrations as well as altered loading conditions from its original construction.</p><p>It is important for all parties involved in the design and construction process of a renovation to understand the history, mechanisms, and limitations of TCFAs in order to have a successful renovation from both a design and a cost perspective. Conversely, renovating a building without the proper knowledge or experience with the existing materials can lead to change orders, time overruns, and most importantly life safety risks.</p><p>This paper is a summary of a presentation given by the same author to the Association for Preservation Technology (APT) conference in September, 2018. A more in-depth paper by the same author and colleagues Derek Trelstad and Rebecca Buntrock will appear as an article in the APT Bulletin in 2019.</p>
Reports on the topic "Archey's frog"
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Barbie, Alexander. ARCHES Digital Twin Framework. GEOMAR, December 2022. http://dx.doi.org/10.3289/sw_arches_core_1.0.0.
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In the Helmholtz Future Project ARCHES (Autonomous Robotic Networks to Help Modern Societies) with a consortium of partners from AWI (Alfred- Wegener-Institute Helmholtz Centre for Polar and Marine Research), DLR (German Aerospace Center), KIT (Karlsruhe Institute of Technology), and the GEOMAR (Helmholtz Centre for Ocean Research Kiel), several Digital Twins of ocean observation systems were developed by the GEOMAR and AWI. The ARCHES Digital Twin Framework is one of the results of this project. The software is based on the Robot Operating System (ROS) and is written in Python.
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Weissinger, Rebecca, and Dana Witwicki. Riparian monitoring of wadeable streams at Courthouse Wash, Arches National Park: Summary report, 2010–2019. Edited by Alice Wondrak Biel. National Park Service, November 2021. http://dx.doi.org/10.36967/nrr-2287907.
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The goal of Northern Colorado Plateau Network (NCPN) riparian monitoring is to determine long-term trends in hydrologic, geomorphic, and vegetative properties of wadeable streams in the context of changes in other ecological drivers, stressors, and processes. This information is intended to provide early warning of resource degradation and determine natural variability of wadeable streams. This report summarizes NCPN monitoring of Courthouse Wash in Arches National Park (NP) from 2010 to 2019. The focus of this report is to (1) present geomorphology and vegetation data from five reaches monitored in Courthouse Wash from 2010 to 2015, and (2) examine patterns in water availability at one monitoring reach from November 2010 to December 2019. Vegetation sampling and geomorphology surveys were suspended in 2016 due to budget cuts; this report presents baseline data for future comparisons. The NCPN has five monitoring reaches located between the inflow of Sevenmile Canyon, a major tributary, and the terminus of Courthouse Wash, at the Colorado River. Two reaches (2, 5) are located in Upper Courthouse Wash, and three (1, 4, 7) in Lower Courthouse Wash. Hydrologic monitoring wells are installed only at Reach 1. During our monitoring period, which included drought years in 2012 and 2018 and a wetter-than-average period from fall 2013 to 2014, groundwater levels showed steep declines corresponding to the start of the growing season each year. Hot, dry summers and falls in 2012, 2018, and 2019 showed the deepest troughs in groundwater levels. Active monsoon years helped elevate summer and fall groundwater levels in 2013 and 2014. Continued monitoring will help us better understand the relationship of climate and water availability at this reach. A geomorphic survey was completed once for reaches 2, 4, and 7, and twice for reaches 5 and 1. Powerful floods during our monitoring period resulted in aggradation of the channel in reaches 5 and 1, which were first surveyed in March 2013. Flooding in September 2013 resulted in an average of 0.24 meters of deposition found in the channel thalweg at Reach 1 in March 2014. Storm events in May 2014 caused additional aggradation. In March 2015, an average of 0.41 meters of deposition was recorded in the channel thalweg at Reach 5, with 0.32 meters of deposition between the vegetation transect headpins compared to the 2013 data. The riparian vegetation recorded at our monitoring reaches is consistent with an open-canopy Fremont cottonwood woodland with a diverse understory. Canopy closure ranged from 29% to 52%. Measurements were sensitive enough to detect a 10% reduction in canopy closure at Reach 5 during a pest infestation in June 2013. Canopy closure subsequently rebounded at the reach by 2015. Total obligate and facultative wetland cover ranged from 7% to 26%. Fremont cottonwood seedlings, saplings, and overstory trees were present at all reaches, indicating good potential for future regeneration of the canopy structure. These data can serve as a baseline for comparison with future monitoring efforts. One area of management concern is that exotic-plant frequency and cover were relatively high in all monitoring reaches. Exotic cover ranged from 2% to 30%. High exotic cover was related to years with high cover of annual brome grasses. High cover of exotic grasses is associated with increased wildfire risk in southwestern riparian systems, which are not well-adapted to fire. Managers should be prepared for this increased risk following wet winters that promote annual brome grass cover. Beaver activity was noted throughout bedrock-constrained reaches in Courthouse Wash. Beaver activity can reduce adjacent woody riparian vegetation cover, but it also contributes to maintaining a higher water table and persistent surface water. Climate change is likely to be an increasingly significant stressor in Courthouse Wash, as hotter, drier conditions decrease water levels and increase drought stress...
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Weissinger, Rebecca, and Carolyn Hackbarth. Water quality in the Northern Colorado Plateau Network: Water years 2019?2022. National Park Service, 2024. http://dx.doi.org/10.36967/2304433.
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Water quality monitoring in National Park Service units of the Northern Colorado Plateau Network (NCPN) is made possible through partnerships between the National Park Service Inventory & Monitoring Division, individual park units, the U.S. Geological Survey, and the Utah Department of Environmental Quality. This report evaluates water quality data from site visits at 42 different locations within and around eight park units in Utah and Colorado from October 1, 2018 through September 30, 2022. Data are compared to state water quality standards for the purpose of providing information to park managers about potential water quality problems. Parks included for evaluation are Arches National Park (NP), Bryce Canyon NP, Canyonlands NP, Capitol Reef NP, Dinosaur National Monument (NM), Hovenweep NM, Timpanogos Cave NM, and Zion NP. Evaluation of water quality parameters relative to state water quality standards indicated that 21,644 (96.8%) of the 22,356 total designated beneficial-use evaluations completed for the period covered in this report met state water quality standards. The most common parameters that did not meet a standard include fecal indicator bacteria (Escherichia coli), water temperature, and total dissolved solids (TDS). While TDS can be an indicator of pollution, in NCPN parks, it mostly occurs downstream of rock outcrops that naturally increase TDS in streams. Phosphorus concentrations were often greater than acceptable thresholds but were rarely associated with indicators of impairment such as algal blooms, fish kills, or low dissolved oxygen. Sites monitored in Arches NP, Bryce Canyon NP, Capitol Reef NP, Dinosaur NM, Hovenweep NM, and Zion NP all had occurrences when fecal indicator bacteria concentrations were greater than associated state standards. State-coordinated plans to reduce waste contamination are in place for the North Fork Virgin River (Zion NP) and the Fremont River (Capitol Reef NP). The plans have resulted in a decrease in the number of chronic and acute standard violations at Zion. Elevated water temperatures occurred at sites in Canyonlands NP, Capitol Reef NP, and Zion NP. Water temperature is strongly correlated with air temperature in surface waters across the Colorado Plateau. Additional issues of management concern include low dissolved oxygen in Salt Wash at Wolfe Ranch (Arches NP) and Square Tower Spring (Hovenweep NM), as well as selenium in the Colorado River (Arches NP and Canyonlands NP). State-coordinated plans to reduce selenium concentrations in the Upper Colorado River basin are in place.
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Allen, Luke, Robert Haehnel, and Yonghu Wenren. South Pole Station snowdrift model. Engineer Research and Development Center (U.S.), August 2022. http://dx.doi.org/10.21079/11681/44943.
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The elevated building at Scott-Amundsen South Pole Station was designed to mitigate the effects of windblown snow on it and the surrounding infrastructure. Because the elevation of the snow surface increases annually, the station is periodically lifted on its support columns to maintain its design height above the snow surface. To assist with planning these lifts, this effort developed a computational model to simulate snowdrift formation around the elevated building. The model uses computational fluid dynamics methods and synthetic wind record generation derived from statistical analysis of meteorological data. Simulations assessed the impact of several options for the lifting operation on drifts surrounding the elevated building. Simulation results indicate that raising the eastern-most building section (Pod A), or the entire station all at once, can reduce drift accumulation rates over the nearby arches structures. Long-term analyses, spanning 5–6 years, determine whether an equilibrium drift condition may be reached after a long period of undisturbed drift development. These simulations showed that after about 6 years, the rate of growth of the upwind drift slows, appearing to approach an equilibrium condition. However, the adjacent drifts were still increasing in depth at a roughly linear rate, indicating that equilibrium for those drifts was still several seasons away.
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Sommer, Stefan, Sascha Flögel, Michael Walter, and Frank Wenzhöfer. Autonomous Robotic Network to Resolve Coastal Oxygen Dynamics : Cruise No. AL547, 20.10. – 31.10.2020, Kiel – Kiel, ARCODYN. GEOMAR Helmholtz Centre for Ocean Research Kiel, 2022. http://dx.doi.org/10.3289/cr_al547.
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The ALKOR cruise AL547 represents a concluding milestone of the Helmholtz innovation project ARCHES (Autonomous Robotic Networks to Help Modern Societies). The aim was to implement a heterogeneous robotic sensing network to simultaneously monitor changes in the water column and at the seafloor. The network has been developed by a consortium of partners from AWI, DLR, GEOMAR and the University of Kiel. The participating sensing platforms allow for real-time data transfer and the entire network shall be able to autonomously respond to environmental changes in the ocean. The network comprised seven different mobile and stationary platforms. Tests were conducted at the Mittelgrund working area in the entrance of the Eckernförde Bay (western Baltic Sea). During 47 stations the various sensing platforms were deployed and recovered for maintenance. A total of 87853 messages were sent using hydro-acoustics, of which 71734 messages contained O 2 data, 15177 were status messages, 926 messages were commands to trigger a change of the measurement behavior of a platform and 16 messages represented broadcasts about the environmental status. We synoptically recorded short-term O 2 time series on the different platforms, which were placed along a depth gradient in the working area. As the Eckernförde Bay is known for sporadic fish kills by anoxia we hope to contribute to a better understanding of the O 2 dynamics in coastal areas. - (ALKOR-Berichte ; AL547)
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Weissinger, Rebecca. Evaluation of hanging-garden endemic-plant monitoring at Southeast Utah Group national parks, 2013–2020. Edited by Alice Wondrak Biel. National Park Service, October 2022. http://dx.doi.org/10.36967/2294868.
Full textAbstract:
Hanging gardens are the most common type of spring at Arches National Park (NP) and Natural Bridges National Monument (NM). They are also present at Canyonlands National Park, but hanging gardens are rare off the Colorado Plateau. Their cliffside setting provides stable access to water without flood disturbance. This combination provides unique habitat that is rich in endemic plant species. The diffuse, seeping emergence of water makes measuring springflow impossible at most sites. Park managers have an interest in monitoring hanging gardens—especially as the climate warms and aridity and water demand both increase. The Northern Colorado Plateau Net-work (NCPN) proposed methods for monitoring seven perennial endemic-plant species at hanging gardens as indicators of spring health and proxies for water availability. Because hanging gardens occur on bedrock outcrops, systematic or random sampling was not possible due to safety concerns and potential resource damage on steep, wet slopes. Examining eight years (2013–2020) of data, this report evaluates the suitability of endemic-plant count data at hanging gardens as a monitoring indicator. It also provides our first evaluation of status and trends at NCPN hanging gardens. The seven species included in monitoring were Rydberg’s thistle (Cirsium rydbergii), Kachina daisy (Erigeron kachinensis), alcove death camas (Zigadenus vaginatus), alcove bog orchid (Habenaria zothecina), cave primrose (Primula specuicola), alcove columbine (Aquilegia micrantha), and Eastwood’s monkeyflower (Mimulus eastwoodiae). Six of the seven species were found at each park. Up to 500 individuals of each species were counted at 42 hanging gardens in Arches NP, 14 hanging gardens in Natural Bridges NM, and 3 hanging gardens in Canyonlands NP. Larger populations were divided into count classes of 501–1,000, 1,001–10,000, and more than 10,000 individuals. Counts from two independent observers and from back-to-back years of sampling were compared for repeatability. Repeatability in count classes was less than 50% for Kachina daisy and Eastwood’s monkeyflower, which both propagate vegetatively via ramets and/or stolons. Repeatability was greater than 90% for only one species, Rydberg’s thistle. The remaining species were categorized in different classes between 15–40% of the time. Independent-observer comparisons were only available for 6.6% of the dataset, but these observations suggested that (1) observer bias was present and (2) the observer with more experience working in hanging gardens generally had higher counts than the observer with less experience in this system. Although repeatability was variable, it was within the range reported by other studies for most species. The NCPN, in discussion with park staff, has elected to make some modifications to the protocol but will continue using endemic plant counts as an indicator of hanging-garden health to maintain a biological variable as a complement to our physical-response data. This is due to their high value to park biodiversity and the difficulty of developing a more robust approach to monitoring in these sites. Endemic-plant monitoring will continue for the five species with the highest repeatability during pilot monitoring and will focus on detecting changes in smaller populations. Most hanging gardens have more than one endemic species present, so several populations can be tracked at each site. Our period of record is relatively brief, and the distribution of endemic-plant populations in different count classes at these sites has not yet shown any statistical trends over time. Be-cause of the large count classes, our methods are more sensitive to showing change in smaller populations (fewer than 500 individuals). Small populations are also of greatest concern to park managers because of their vulnerability to declines or extirpation due to drought. Over-all, more sites had endemic-plant populations of fewer than 100 individuals at the end...
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Hackbarth, Carolyn, and Rebeca Weissinger. Water quality in the Northern Colorado Plateau Network: Water years 2016–2018 (revised with cost estimate). National Park Service, November 2023. http://dx.doi.org/10.36967/nrr-2279508.
Full textAbstract:
Water-quality monitoring in National Park Service units of the Northern Colorado Plateau Network (NCPN) is made possible through partnerships between the National Park Service Inventory & Monitoring Division, individual park units, the U.S. Geological Survey, and the Utah Division of Water Quality. This report evaluates data from site visits at 62 different locations on streams, rivers, and reservoirs in or near ten NCPN park units between October 1, 2015 and September 30, 2018. Data are compared to state water-quality standards for the purpose of providing information to park managers about potential water-quality problems. The National Park Service does not determine the regulatory status of surface waters; state water quality agencies determine whether waters comply with the Clean Water Act. Evaluation of water-quality parameters relative to state water-quality standards indicated that 17,997 (96.8%) of the 18,583 total designated beneficial-use evaluations completed for the period covered in this report met state water-quality standards. The most common exceedances or indications of impairment, in order of abundance, were due to elevated nutrients, elevated bacteria (E. coli), elevated water temperature, elevated trace metals, elevated total dissolved solids (and sulfate), elevated pH, and low dissolved oxygen. While some exceedances were recurring and may have been caused by human activities in the watersheds, many were due to naturally occurring conditions characteristic of the geographic setting. This is most apparent with phosphorus, which can be introduced into surface water bodies at elevated levels by natural weathering of the geologic strata found throughout the Colorado Plateau. Higher phosphorus concentrations could also be attributed to anthropogenic activities that can accelerate erosion and transport of phosphorus. Some activities that can increase erosional processes include grazing, logging, mining, pasture irrigation, and off-highway vehicle (OHV) use. Exceedances for total phosphorus were common occurrences at nine out of ten NCPN park units, where at least one site in each of these parks had elevated phosphorus concentrations. At these sites, high levels of nutrients have not led to algal blooms or other signs of eutrophication. Sites monitored in Arches National Park (NP), Black Canyon of the Gunnison NP (BLCA), Bryce Canyon NP (BRCA), Capitol Reef NP (CARE), Curecanti National Recreation Area (CURE), Dinosaur National Monument (DINO), and Zion NP (ZION) all had E. coli ex-ceedances that could be addressed by management actions. While many of these sites already have management actions underway, some of the actions necessary to bring these waters into compliance are beyond the control of the National Park Service. Changes to agricultural practices to improve water quality involves voluntary participation by landowners and/or grazing permittees and their respective states. This could be the case with lands upstream of several parks with E. coli contamination issues, including Red Rock Canyon (BLCA); Sul-phur, Oak, and Pleasant creeks (CARE); Blue Creek and Cimarron River (CURE); Brush and Pot creeks (DINO); and North Fork Virgin River (ZION). Issues with E. coli contamination at Yellow Creek (BRCA) seemed to be resolved after the park boundary fence downstream of the site was repaired, keeping cattle out of the park. At North Fork Virgin River, E. coli exceedances have been less frequent since the State of Utah worked with landowners and grazing permittees to modify agricultural practices. Continued coordination between the National Park Service, state agencies, and local landowners will be necessary to further re-duce E. coli exceedances and, in turn, improve public health and safety in these streams. Selenium concentrations in Red Rock Canyon (BLCA) continued to exceed the state aquat-ic-life standard at both the upstream and downstream sites. Although selenium weathers naturally from bedrock and...
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2022 Arches National Park Visitor Spending and Experience Study (Final Report and Appendices on 2022 Data Collection). National Park Service, 2023. http://dx.doi.org/10.36967/2301574.
Full textAbstract:
? This report describes the results of a visitor use study at Arches National Park conducted from May 27 through June 6, 2022. During the sampling period, 1,121 visitor groups were contacted to participate in the survey. Of those groups, 942 agreed to participate in the on-site intercept survey (84 percent on-site response rate) and 840 agreed to participate in the mail-back survey by accepting a mail-back survey packet (75 percent cooperation rate). Questionnaires were completed and returned by 465 visitor groups, resulting in a completion rate of 55 percent among those visitor groups that accepted a mail back questionnaire, and an overall mail-back response rate of 42 percent for the study. ? This report profiles a systematic random sample of Arches National Park visitors. Most of the results are presented in graphs and frequency tables. Summaries of visitor comments are included in the body of the report. Verbatim comments are included in the Visitor Comment Appendix (bound separately).
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2021 Arches National Park Visitor Spending and Experience Study (Final Report and Appendices on 2021 Data Collection). National Park Service, 2023. http://dx.doi.org/10.36967/2301570.
Full textAbstract:
? This report describes the results of two visitor use studies at Arches National Park conducted from May 27 through June 7, 2021 and November 5 through November 15, 2021. During the two sampling periods, 1,726 visitor groups were contacted to participate in the survey. Of those groups, 1,647 agreed to participate in the study by accepting a mail-back survey packet. Questionnaires were completed and returned by 805 total visitor groups, resulting in a completion rate of 51% among those visitor groups that accepted a mail-back questionnaire and an overall mail-back response rate of 44% for the summer sampling effort and resulting in a completion rate of 60% among those visitor groups that accepted a mail-back questionnaire and an overall mail-back response rate of 49% for the winter sampling effort. ? This report profiles a systematic random sample of Arches National Park visitors. Most of the results are presented in graphs and frequency tables. Summaries of visitor comments are included in the body of the report. Verbatim comments are included in the Visitor Comment Appendix (bound separately).