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Articles de revues sur le sujet "Clay Club (N.Y.)"
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Parrish, Alan. « A life member of the Trevor Clay fan club ». Nursing Standard 16, no 49 (21 août 2002) : 22. http://dx.doi.org/10.7748/ns.16.49.22.s38.
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Kaur, Ravneet, Nidhi Bhatnagar et Binod Kumar Patro. « Journal Club : A Club for Medical Education ! » Journal of Postgraduate Medicine, Education and Research 49, no 1 (2015) : 43–45. http://dx.doi.org/10.5005/jp-journals-10028-1141.
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ABSTRACT Journal club (JC) is an effective and valuable tool in medical education. Critical reasoning and evidence based medicine practice are core competencies required by medical professionals. In times of today journal club offers several advan- tages, e.g. update with current literature, promote evidencebased medicine, demonstrate continuing medical education, learn critical appraisal skills and promote social interaction and debate. However, this tool remains largely underutilized. Practice of inappropriate methodology results in failure to achieve the intended outcomes. This report attempts to track the history of journal club, its types, current innovations made and role in medical education. It explores the potential utilization of this tool in times to come. How to cite this article Bhatnagar N, Kaur R, Patro BK. Journal Club: A Club for Medical Education! J Postgrad Med Edu Res 2015;49(1):43-45.
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Miloslavski, I., L. Heller-Kallai et Z. Aizenshtat. « Reactions of clay condensates with n-alkanes : comparison between clay volatiles and clay condensates ». Chemical Geology 91, no 3 (septembre 1991) : 287–96. http://dx.doi.org/10.1016/0009-2541(91)90005-c.
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Ayele, Shegaw, et Dr Biruk Hundito. « INVESTIGATING THE PROBLEM OF FINANCIAL MANAGEMENT IN THE DEVELOPMENT OF HADIYA HOSSANA FOOTBALL CLUB ». International Journal of Research Pedagogy and Technology in Education & ; Movement Sciences 11, no 04 (2022) : 24–32. http://dx.doi.org/10.55968/ijems.v11i04.231.
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The purpose of this study was to investigate the problem of financial management in the development of Hadiya Hosanna football club. The study was used by the Hadiya Hosanna football club administrative staff, Hadiya Hosanna football club supporter association, Hadiya zone youth and sport office, and Hadiya Hosanna football club board. The study examined the concepts of each research question. What are the challenges of the financial management system in the development of Hadiya Hossana football club? What are the sources of financial income in Hadiya Hossana football club? To achieve this objective, a cross-sectional descriptive survey method was used in order to collect data once from five (5) administrative staff, eleven (11) Hadiya Hosanna football club supporter associations, fifteen (15) Hadiya zone youth and sport office, and eleven (11) Hadiya Hosanna football club board. A total of forty-two (42) people were included. The following sampling was selected from three (n = 3) Hadiya Hosanna football club administrative staff, seven (n = 7) Hadiya Hosanna football club supporter association, thirteen (n = 13) Hadiya zone youth and sport office, and seven (n = 7) Hadiya Hosanna football club board. The researcher used 30 respondents by using a purposive sampling technique. The data sources were primary and secondary sources. A Likert scale structured questionnaire was used to collect data from respondents. A pilot test was conducted to measure the instruments' validity and reliability, and the data was analyzed by SPSS version 25. The data secured from different sources was analyzed and interpreted using both quantitative and qualitative approaches through descriptive statements like percentage, frequency, mean and standard deviation.
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Van Broekhoven, Deborah. « ‘Better than a clay club’ : The organization of anti‐slavery fairs, 1835–60 ». Slavery & ; Abolition 19, no 1 (avril 1998) : 24–45. http://dx.doi.org/10.1080/01440399808575227.
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Pryce, Julia, Michael S. Kelly, Mary Lawinger et Anne Wildman. « Conversation Club : A Promising Practice in Youth Mentoring of Migrants and Refugees ». Advances in Social Work 18, no 3 (18 septembre 2018) : 767–87. http://dx.doi.org/10.18060/21650.
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This paper evaluates Conversation Club, a Canadian after-school group mentoring intervention focusing on the expansion of the program across three separate regions of Ontario. The authors use a multiple methods design, including questionnaires (n=101), post-session process data, and qualitative interviews (n=18), to evaluate how Conversation Club impacts members’ feelings of hope, belonging, sense of ethnic identity, and social support. A focus group (n = 7) with program facilitators was also conducted to explore the process of dissemination of the Club across regions. Findings suggest that Conversation Club holds promise for newcomer youth across settings. Quantitative data showed significant change (p <.01) in levels of hope and sense of belonging. Interviews revealed an increased sense of belonging, possibility, and social support, as well as improved confidence in communicating with others. Insights regarding use of the Club manual suggest the importance of integrating Conversation Club values with flexibility in facilitation to incorporate the strengths and opportunities of context across regions. Study limitations, as well as implications for further social work research and dissemination of best practices in services for migrant and refugee youth, are discussed.
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Tredway, L. P. « First Report of Summer Patch of Creeping Bentgrass Caused by Magnaporthe poae in North Carolina ». Plant Disease 89, no 2 (février 2005) : 204. http://dx.doi.org/10.1094/pd-89-0204a.
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An unknown disease was observed in June 2002 and 2003 on creeping bentgrass (CRB [Agrostis stolonifera L.]) putting greens at The Country Club of Landfall in Wilmington, NC that were established in 2001 with a 1:1 blend of cvs. A-1 and A-4. Soil pH ranged from 7 to 8 at this location because of poor quality irrigation water. Symptoms appeared in circular patches of 0.3 to 1 m in diameter that exhibited signs of wilt followed by chlorosis and orange foliar dieback. The disease was initially diagnosed as take-all patch caused by Gaeumannomyces graminis (Sacc.) Arx & D. Olivier var. avenae (E.M. Turner) Dennis, based on the observation of necrotic roots and crowns that were colonized with dark, ectotrophic hyphae. However, the historical lack of take-all patch occurrence in this region led to the suspicion that G. graminis var. avenae was not involved. Sections of root and crown tissue were surface disinfested in 0.6% NaOCl for 5 min or 1% AgNO3 for 1 min and 5% NaCl for 30 s. Tissue was plated on SMGGT3 (2) or on potato dextrose agar containing 50 mg L-1 of tetracycline, streptomycin, and chloramphenicol. A fungus resembling Magnaporthe poae Landschoot & Jackson was consistently obtained regardless of isolation method. Teleomorph production was conducted on Sachs agar (4) overlaid with autoclaved wheat (Triticum aestivum L.) stem sections. Seven isolates were plated alone or paired with M. poae tester isolates 73-1 or 73-15 (3) and incubated at room temperature under continuous fluorescent illumination. Six isolates produced perithecia and ascospores typical of M. poae (3) when paired with 73-15 but not when plated alone or paired with 73-1; these isolates are, therefore, M. poae mating type ‘a’. Isolate TAP42 did not produce perithecia and remains unidentified. Cone-Tainers (3.8 × 20 cm) containing calcined clay were seeded with ‘A-4’ CRB (9.7 g cm-2) and inoculated 8 weeks later by placing four M. poae-infested rye (Secale cereale L.) grains below the soil surface. Inoculated Cone-Tainers were placed in growth chambers with 12-h day/night cycles at 30/25°C, 35/25°C, or 40/25°C. Field plots (1 m2) of ‘A-4’ CRB in Jackson Springs, NC were inoculated on 19 June 2003 by removing a soil core (1.9 × 10.3 cm) from the center of each plot, adding 25 cm3 of M. poae-infested rye grains, and then capping the hole with sand. Growth chamber and field inoculations were arranged in a randomized complete block with four replications. Eight weeks after inoculation in the growth chamber, isolates TAP35, TAP41, and SCR4 caused significant foliar chlorosis and dieback at 12-h day/night cycles of 30/25°C and 35/25°C, but only TAP41 induced symptoms at 40/25°C. Isolate TAP42 did not induce symptoms at any temperature regimen. Orange patches (10 to 15 cm in diameter) were observed in field plots inoculated with TAP41 on 27 August 2003. No other isolates induced aboveground symptoms. Roots and crowns of plants exhibiting foliar symptoms in the greenhouse and field were necrotic and colonized with ectotrophic hyphae, and M. poae was consistently isolated from this tissue. Although M. poae has been associated with CRB in Florida (1), to our knowledge, this is the first report of summer patch of CRB within the normal zone of adaptation for this turfgrass species. Observation of this disease highlights the need for accurate methods for diagnosis of diseases caused by ectotrophic root-infecting fungi. References: (1) M. L. Elliott. Plant Dis. 77:429, 1993. (2) M. E. Juhnke et al. Plant Dis. 68:233, 1984. (3) P. J. Landschoot and N. Jackson. Mycol. Res. 93:59, 1989. (4) E. S. Lutrell. Phytopathology 48:281, 1958.
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Weinstein, Nicole. « Nursery World visits… N Family Club Stoke Newington ». Nursery World 2024, no 3 (2 mars 2024) : 24–25. http://dx.doi.org/10.12968/nuwa.2024.3.24.
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Post, Eric G., Dan Schaefer, Kevin M. Biese, Lisa Cadmus-Bertram, Andrew Watson, Timothy A. McGuine, Alison Brooks et David Bell. « A COMPARISON OF EMERGENCY PREPAREDNESS AND MEDICAL COVERAGE BETWEEN HIGH SCHOOL AND CLUB SPORT COACHES ». Orthopaedic Journal of Sports Medicine 7, no 3_suppl (1 mars 2019) : 2325967119S0006. http://dx.doi.org/10.1177/2325967119s00061.
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BACKGROUND: Recent studies have demonstrated that a large population of high-school aged athletes participate on club sport teams. Studies have documented emergency preparedness and medical coverage standards in the high school athletic setting. However, similar examinations do not exist for youth club sport teams. PURPOSE: To determine if differences in emergency preparedness and medical coverage exist between high school team coaches and high school-aged club team coaches. A secondary purpose was to compare emergency training characteristics between high school and club coaches. METHODS: A total of 769 coaches (female N=266, 34.6%, age: 41.0±11.5 years) completed an anonymous online questionnaire regarding their emergency preparedness and training. Coaches from 3 sports were surveyed (basketball N=290, volleyball N=256, soccer N=223). The questionnaire consisted of 1) demographics and information regarding the teams that the respondent coaches, 2) emergency preparedness factors such as automated external defibrillator (AED) availability, emergency action plan (EAP) awareness, and medical coverage, and 3) emergency care training requirements (CPR, AED, first aid). Chi-square tests were used to compare response frequencies to various emergency preparedness questions between high school and club coaches. RESULTS: Overall, 64.6% (N=497) respondents were coaches of a high school team, and 35.4% (N=272) were coaches of a club team with high school-aged athletes. High school coaches were more likely than club coaches to be aware of the EAP for their practice venue (83.9% vs. 54.4%, p<.001), but most coaches in both categories had not practiced their EAP in the past 12 months (70.0% vs. 68.9%, p=.54). During competitions, high school coaches were more likely than club coaches to be aware of the EAP (47.5% vs. 37.1%, p=.02). However, the majority of coaches in each category reported that they were never aware of EAPs during competition. High school coaches were more likely than club coaches to 1) have an AED available at practice (87.9% vs. 58.8%, p<.001), 2), to report that athletic trainers were responsible for medical care at practices (31.2% vs. 8.8%, p<.001) and competitions (57.9% vs. 31.2%, p<.001), and 3) to be required to have CPR, AED, or first aid training (p<.001). Nearly all (98.8%) high school coaches were required to have CPR training, and overall, 58.6% of high school coaches were required to have training in all 3 categories (CPR, AED, first aid) compared to 23.9% of club coaches (p<.001). CONCLUSIONS: High school sport coaches displayed greater levels of emergency preparedness and training compared to coaches of high school-aged club teams. Significant attention and effort is needed to improve emergency preparedness and medical coverage at the club sports level among basketball, soccer, and volleyball coaches.
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Hamilton, Mark D., Frank J. Cruz et James McConnell. « RELEASE OF NITRATE - N FROM TROPICAL SOILS TREATED WITH FERTILIZERS ». HortScience 28, no 5 (mai 1993) : 463e—463. http://dx.doi.org/10.21273/hortsci.28.5.463e.
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The passage of nitrate nitrogen through three Guam soils was investigated using six different fertilizers. Controlled release and water soluble forms were applied to soils in polycarbonate pots 11cm in diameter. Controls received no fertilizer application. Soil types used were Yigo silty clay and Guam cobbly clay loam, from northern Guam, and Akina silty clay from southern Guam. All pots were exposed to ambient temperature and humidity but were shielded from direct sunlight and rain. All were kept near field capacity by daily applications of distilled water. Leachate was collected weekly for three months and measured using an ion selective electrode. Initial results suggest that nitrate levels were primarily affected by soil type rather than the type of fertilizer applied. Nitrate was invariably highest in Yigo silty clay, lowest in the Akina silty clay and intermediate in the Guam cobbly clay pots. Patterns of nitrate release were similar in the Yigo silty clay and Guam cobbly clay soils with peak values at the fourth and fifth week, 700ppm and 450 ppm respectively, then falling to 300ppm and 150ppm respectively by the sixth week. However, Akina silty clay soils gradually increased in nitrate to 120 ppm in the last two weeks of the experiment.
Thèses sur le sujet "Clay Club (N.Y.)"
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Hall, Joanna Louise. « Heterocorporealities : popular dance and cultural hybridity in UK drum 'n' bass club culture ». Thesis, University of Surrey, 2009. http://epubs.surrey.ac.uk/2160/.
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Pilavtepe, Müge [Verfasser], et N. [Akademischer Betreuer] Willenbacher. « Microstructure and Rheology of Colloidal Natural Clay Mineral Dispersions / Müge Pilavtepe ; Betreuer : N. Willenbacher ». Karlsruhe : KIT-Bibliothek, 2018. http://d-nb.info/1154856674/34.
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Li, Jing. « 17beta-estradiol degradation photoinduced by iron complex, clay and iron oxide minerals : effect of the iron complexing agent ethylenediamine-N,N'-disuccinic acid ». Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2010. http://tel.archives-ouvertes.fr/tel-00719247.
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La photodégradation du bêta-estradiol (E2), un perturbateur chimique endocrinien, est réalisée en présence d'un complexe de fer, d'argiles et d'un oxyde de fer. L'impact d'un agent complexant du fer l'acide éthylénediamine-N,N'-disuccinique (EDDS) est aussi étudié. Après la détermination des propriétés physico-chimiques du complexe Fe(III)-EDDS, les rendements quantiques de formation des °OH et de dégradation de E2 ont été évalués en fonction de différents (pH, [O2], [Fe(III)-EDDS], [Fe(III)]. Pour la première fois, les rendements quantiques de production d'°OH ont été mesurés via la photolyse du complexe Fe(III)-EDDS en utlilisant l'acide téréphtalique comme sonde. Dans une seconde partie, les processus d'adsorption et de dégradation photocatalytique de E2 dans des suspensions de Montmorillonite KSF, de Montmorillonite naturel et de Goethite sont étudiés. L'adsorption de E2 sur les minéraux est rapide et faible. La vitesse de photodégradation de E2 est influencée par la concentration en minéraux et le pH. Le processus de dégradation photocatalytique de E2 dans ces systèmes a par la suite été étudié en présence d'EDDS. Dans les trois suspensions et en présence d'EDDS, la photodégradation de E2 augmente significativement dans la zone de pH neutre et basique (de 5,0 à 9,0). Au contraire, sans EDDS le pH optimal est limité aux pHs acides ( entre 3,0 et 4,0). Les cinétiques de dégradation de E2 suivent une loi de vitesse du modèle Langmuir-Hinshelwood pour les trois systèmes. Sur la base de nos résultats, il est possible de conclure que les systèmes EDDS-Fe(III)/minéraux sont photocatalytiquement efficaces pour l'élimination de polluants dans l'eau
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Silva, DrÃulio Sales da. « SÃntese, CaracterizaÃÃo e LiberaÃÃo de Troxerutina por SBA-n/MCM-41/Argila Montmorilonita/HidrogÃis ». Universidade Federal do CearÃ, 2009. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6837.
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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgicoOs materiais mesoporosos ordenados, como MCM-41 e SBA-15, a argila montmorilonita e os hidrogÃis estÃo dentre os excipientes mais estudados, pesquisados e utilizados em tecnologia farmacÃutica, uma vez que sistemas de liberaÃÃo controlada de fÃrmacos tÃm crescido nos Ãltimos anos devido Ãs vantagens econÃmicas e aos grandes benefÃcios terapÃuticos. O presente trabalho teve como objetivo sintetizar os materiais mesoporosos SBA-15 e MCM-41 a partir de copolÃmeros triblocos, realizando um estudo comparativo de liberaÃÃo do fÃrmaco troxerutina entre os materiais mesoporosos com a argila montmorilonita e os hidrogÃis. Os materiais mesoporosos foram sintetizados, calcinados, modificados com quitosana e incorporados`a troxerutina para ser caracterizados por difraÃÃo de raios-X, adsorÃÃo de gases, anÃlise termogravimÃtrica (TG) e espectroscopia de absorÃÃo na regiÃo do infravermelho (FTIR). A argila montmorilonita, os hidrogÃis poliacrilamida (PAM) e a bentonita (BENPG10), depois de hidrolisados, foram incorporados ao fÃrmaco e caracterizados por espectroscopia de absorÃÃo na regiÃo do infravermelho (FTIR) e difraÃÃo de raios-X. Estudos de raios-X permitiram caracterizar o material poroso sintetizado como pertencente à classe dos mesoporosos e que a argila intercalou o fÃrmaco em suas lamelas. Estudos de espectroscopia de absorÃÃo na regiÃo do infravermelho (FTIR) permitiram caracterizar os grupos funcionais da rede sÃlica, da quitosana e da troxerutina presente nos mesopororos. A anÃlise termogravimÃtrica (TGA) mostrou que a decomposiÃÃo do direcionador estrutural ocorre nos materiais em temperaturas inferiores a 500 ÂC. A adsorÃÃo de gases evidenciou as modificaÃÃes na Ãrea superficial e no diÃmetro de poros pela presenÃa do fÃrmaco e quitosana. Os estudos de liberaÃÃo evidenciaram que a taxa de liberaÃÃo possui diferentes comportamentos de acordo com a matriz e o meio utilizado.
The ordered mesoporous materials such as MCM-41 and SBA-15, the montmorilonite clay and hydrogels are amongst the most studied and researched excipients used in pharmaceutical technology mainly because dry delivery systems have grown in the past few years due to the economical advantages and to the therapeutic benefits they present. The objective of this work is to synthesize the mesoporous materials SBA-15 and MCM-41 from triblock copolymers and to make a comparative study of troxerutin release with montmorilonite clay and hydrogels. The mesoporous materials were synthesised, calcinated and modified with chitosan and added to troxerutin for characterization by X-ray diffraction, gas adsorption, thermogravimetric analysis (TG) and infrared spectroscopy (FTIR). The Montmorilonite clay, the polyacrilamide hydrogels (PAM) and the bentonite (BENPG10), after hydrolysed, were incorporated to the drug, characterized by infrared spectroscopy (FTIR) and X-ray diffraction. X-ray studies allowed characterizing the porous synthesized material as belonging to the mesoporous class and that the clay intercalated drug medicine in its lamellae. Infrared spectroscopy studies allowed characterizing the functional groups of the silica network, of chitosan and troxerutin present in the mesopores. The thermogravimetric analysis (TGA) showed that the decomposition of the structure-directing agentoccurs in the materials at temperatures below 500 ÂC. The adsorption of gas makes it evident that there were modifications in the surface area and in the diameter of pores by the presence of the drug and chitosan. The release studies showed that the release rate has different behaviours according to the matrix and the medium used.
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Oliveira, Ana LÃcia Nunes FalcÃo de. « PiralizaÃÃo das Argilas Montmorilonita e Estevensita com oligÃmero de alumÃnio. CaracterizaÃÃo e estudo de propriedades catalÃticas em reaÃÃes de hidroisomerizaÃÃo de n-octano ». Universidade Federal do CearÃ, 2004. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1689.
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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel SuperiorDuas argilas do tipo esmectitas, uma montmorilonita da regiÃo de Campina Grande (Pb) e uma estevensita de Marrocos foram utilizadas no processo de intercalaÃÃo e pilarizaÃÃo com soluÃÃes oligomÃricas de alumÃnio. AtravÃs dos resultados de espectrometria ICP-AES com plasma indutivamente acoplado foram determinadas as composiÃÃes quÃmicas que resultaram nas fÃrmulas empÃricas (Na0,43K0,22Ca0,09)(Al1,48,Mg0,18,Fe0,34)2Si4O10(OH)2 e (Li0,09Na0,04K0,03Ca0,05)(Al,Mg,Fe)2(Si,Fe,Al)4O10(OH)2. da montmorilonita e da estevensita respectivamente.Os valores das Ãreas especÃficas foram 29 m2.g-1 e 228 m2.g-1, antes da intercalaÃÃo e de 106 m2.g-1 e 219 m2.g-1, apÃs a pilarizaÃÃo, para a montmorilonita e estevensita, respectivamente. As argilas foram submetidas a lavagens a quente com hipoclorito para remoÃÃo da matÃria orgÃnica, e transformadas na forma homoiÃnica com NaCl, seguidas de intercalaÃÃes com complexo de alumÃnio e pilarizaÃÃo a 500ÂC. AtravÃs de anÃlises termogravimÃtricas e por difratometria de raios-X, foi avaliada a influÃncia da matÃria orgÃnica na intercalaÃÃo das argilas. Os resultados mostraram que as espÃcies mais estÃveis foram Ãquelas submetidas ao tratamento com hipoclorito. A estevensita apresentou atividade catalÃtica de cerca de 15% acima da capacidade da montmorilonita, cujo mÃximo ficou em 50 % a 315 ÂC, mas com percentual de isomerizaÃÃo na ordem de 82%, cerca de 13% superior a estevensita; A produÃÃo de isÃmeros do tipo Mono e Di foram semelhantes para as duas argilas, sendo de 84% e 16% respectivamente; Os isÃmeros predominantes para ambas Ãs argilas foram 3-metilheptano e 2-4-dimetilhexano; Apesar das atividades catalÃticas das argilas pilarizadas nÃo terem atingindo os mesmos nÃveis que para as zeÃlitas, como a ZSM-22, os percentuais relativos de isomerizaÃÃo superam os valores reportados para essa zeÃlita, na temperatura onde as atividades dessas argilas sÃo mÃximas.
Two clays of the smectites type, a montmorillonite from the region of Campina Grande (Pb) and the stevensite of Marrocos were used in the process of intercalation and pillarization. Through the results of spectrophotometry of atomic absorption ICP-AES the chemical composition of the montmorillonite was determined as(Na0,43K0,22Ca0,09)(Al1,48,Mg0,18,Fe0,34)2Si4O10(OH)2. By the same process, the composition of the stevensite was determined as (Li0.09Na0.04K0.03Ca0,05)(Al,Mg,Fe)2(Si,Fe,Al)4O10(OH)2. The values of the specific areas were 29 m2.g-1 and 228 m2.g-1, before the intercalation and 106 m2.g-1 and 219 m2.g-1, after the pillarization, for the montmorillonite and stevensite, respectively. The clays were submitted to a treatment for removal of the organic matter and then transformed in the homoionic type with NaCl, and inserted with aluminium complex and pillarization at 500 oC. Through thermogravimetric analysis and X-Ray diffractometry, it was evaluated the influence of the organic matter in the intercalation of the clays. The results showed that the more stable samples were those submitted to treatment with hypochlorate. The stevensite presented catalytic activity of about 15% above the capacity of the montmorillonite, whose maximum was 50% at 315 oC. Its percentage of isomerization however, in the order of 82%, was about 13% more than for stevensite. The production of isomers of the Mono and Di type were similar for the two clays, being of 84% and 16% respectively. The predominant isomers for both clays were 3-methylheptane and 2-4-dimethylhexane. Despite the catalytic activities of the pillared clays having not reached the same levels for zeolites as ZSM-22, the isomerization relative percentages exceeded the figures reported for this zeolite, at the temperature where the activities of these clays are maximum.
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Cohen, Peña Luis Alonso, et Castillo Percy Alejandro Paz. « Mejoramiento del CBR adicionando escoria de acero blanca al suelo de la Ruta N° LI-810 con trayectoria : Emp. pe-3n (Quiruvilca) – Bandurria ». Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/654497.
Texte intégralRésumé :
En los proyectos de infraestructura vial, se contemplan imprevistos debido a la presencia de suelos arcillosos. La causa principal de estos problemas se debe a sus malas características mecánicas, la cual puede ser medida mediante el ensayo de california bearing ratio (CBR). Esto puede ocasionar que la vida útil de la carretera se vea reducida, además, la mala calidad de la subrasante podría ocasionar mayor necesidad de mantenimientos. Sin embargo, diversos estudios concuerdan que, al mezclar escoria de acero blanca con los suelos arcillosos, se logra aumentar los valores del CBR.
Esta investigación, aplica la estabilización del suelo de la ruta N°LI-810 con trayectoria: Emp.PE-3N (Quiruvilca) – Bandurria con escoria de acero blanca de SIDERPERU. Se utilizaron tres diferentes porcentajes de escoria blanca según al peso de la muestra (7.5%, 15% y 22.5%) en el ensayo de CBR.
Los ensayos de laboratorios brindaron resultados favorables con el aumento de la capacidad de soporte (CBR). Analizando los efectos de la estabilización, se determinó que el 10% de escoria de acero blanca según el peso de la muestra, es el porcentaje optimo que logra aumentar su CBR a un 3% (porcentaje mínimo establecido por el Ministerio de Transporte y Comunicaciones) y transformarlo de una subrasante inadecuada a una subrasante pobre que se pueda utilizar con fines viales.In road infrastructure projects, contingencies are contemplated due to the presence of clay soils. The main cause of these problems is due to its poor mechanical characteristics, which can be measured by the California bearing ratio (CBR) test. This can cause the useful life of the road to be reduced, in addition, the poor quality of the subgrade could cause a greater need for maintenance. However, various studies agree that, by mixing white steel slag with clay soils, it is possible to increase the CBR values. This research applies the stabilization of the soil of route N ° LI-810 with trajectory: Emp.PE-3N (Quiruvilca) - Bandurria with white steel slag from SIDERPERU. Three different percentages of white slag were used according to the weight of the sample (7.5%, 15% and 22.5%) in the CBR test. Laboratory tests provided favorable results with increased bearing capacity (CBR). Analyzing the effects of stabilization, it was determined that 10% of white steel slag according to the weight of the sample, is the optimal percentage that manages to increase its CBR to 3% (minimum percentage established by the Ministry of Transportation and Communications) and transform it from an unsuitable subgrade to a poor subgrade that can be used for highway purposes.
Trabajo de investigación
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SILVA, Cristiane Henrique da. « Influência da incorporação de sólidos nas propriedades de fluidos de perfuração sintéticos ». Universidade Federal de Campina Grande, 2014. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/349.
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Capes
Este trabalho apresenta um estudo sobre a influência da incorporação de argila bentonítica e carbonato de cálcio sobre as propriedades de um fluido de perfuração sintético n-parafina. Para tanto, a pesquisa utilizou argila bentonítica com tamanho de partícula de 45 µm e 75 µm e carbonato de cálcio com tamanhos de partículas nas faixas de 2-44 µm e 2-74 µm para analisar os efeitos da incorporação de sólidos. A análise da influência destes contaminantes foi realizada nas concentrações de 5%, 10% e 15% do volume da amostra de fluido (350 mL) considerados em massa. Para estudar a influência desses contaminantes foram determinadas, em laboratório, as propriedades: densidade, estabilidade elétrica, resistividade elétrica, comportamento de fluxo, viscosidade plástica, viscosidade aparente, limite de escoamento, força gel, volume de filtrado. Além desses ensaios, também foi realizada a caracterização dos contaminantes por meio da análise granulométrica e do teste de ângulo de contato. Os resultados obtidos demonstraram que o tipo de sólido contaminante exerce diferente influência sobre as propriedades do fluido, sendo a argila bentonítica responsável por maiores efeitos sobre as propriedades reológicas e o volume de filtrado, enquanto que, o carbonato de cálcio exerce maior influência sobre a densidade e a estabilidade elétrica. Mas, de maneira global a argila bentonítica exerce maior influência sobre todas as propriedades. Partículas mais finas causam maior efeito sobre as propriedades estudadas. Com relação aos teores dos contaminantes observou-se que o volume de filtrado é a propriedade que sofre maiores efeitos. Porém, o aumento ou a diminuição de uma ou outra propriedade não ocorre de maneira linear com relação ao aumento do teor de contaminante.
This work presents a study about the influence of the incorporation of bentonite clay and carbonate calcium in n-paraffin synthetic drilling fluids properties. Thus, the research uses bentonite clay with particle size of 45 µm and 75 µm, besides calcium carbonate with particle sizes in the ranges of 2-44 µm and 2-74 µm to simulate the effects of the solid incorporation. The analysis of the influence of such contaminants is performed in the concentrations of 5%, 10% and 15% of the volume of the fluid sample (350 mL) considered by mass. To study the influence of these contaminants the density, electrical stability, electrical resistivity, flow behavior, plastic viscosity, apparent viscosity, yield point, gel strength, and volume filtered properties of the n-paraffin synthetic fluids are measured in laboratory. In addition to these tests, the characterization of contaminants through granulometric analysis and contact angle test is also performed. The results show that the type of solid contaminant exerts different influence on the fluids properties. The bentonite clay is responsible for the greatest effect on the rheological properties and the volume of the filtrated, while the calcium carbonate is more influent on the density and electrical stability. However, globally the bentonite clay exerts greater influence on the all properties. Finer particles cause greater effect on the studied properties. With respect to the concentration of contaminants is observed that the volume of filtrated is the property that suffers the greatest effect. However, the increase or decrease of one or other property does not occur linearly with respect to increasing the amount of contaminant.
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Tabaldi, Fabiano Maurício. « USO DE SENSOR DE VEGETAÇÃO PARA AVALIAÇÃO DA NUTRIÇÃO NITROGENADA NA CULTURA DO ALGODOEIRO E SENSOR DE SOLO NO ESTUDO DA CONDUTIVIDADE ELÉTRICA NA CULTURA DO MILHO ». Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/4825.
Texte intégralRésumé :
The use of remote sensing techniques can eliminate the need for extensive sampling in the field, reducing the cost of sampling and increase the accuracy of the results. In this context, the present study had the following objectives: I-evaluate the effectiveness of an optical sensor for determining the nitrogen nutritional status of cotton crop subjected to different doses of N and correlate with the crop yield. II- to determine the electrical conductivity in two fields of classification Oxisols by using a sensor and relate this index with other chemical soil parameters and productivity of corn. Regarding the first objective, the experiment was conducted in the agricultural year of 2012/13 on a Oxisol with the cotton crop. The experimental design was a randomized block design with seven treatments and three replications. Treatments consisted of the following N rates: 0, 45, 90, 130, 150, 180 and 220 kg ha-1 applied at 43 days after sowing (DAS). The vegetation index readings were taken at three different times, corresponding to 63, 75 and 97 DAE with the optical sensor N-Sensor ALS ® (YARA). Concerning the objective II electrical conductivity was evaluated of two areas using the Veris ® 3100 sensor to depths of 0-30 cm and 0-90 cm. The evaluations were conducted in the agricultural year 2012/13, the cultivated culture, in both areas, was the corn. Chemical parameters of the soil and the electrical conductivity were compared by method of multiple regression 'stepwise'. Regarding the first objective, the vegetation index reading by sensor showed high correlation with N rates in three stages evaluated, this correlation was also found with the parameters plant height, dry matter and N absorbed. The highest yield of cotton was achieved with rate of 152 kg ha-1 of N. Regarding the objective II, the EC of Area 1, for 0-30 cm layer, was explained by factors V% and Mg and in the layer of 0-90 cm by SB factor. For Area II, the EC in the 0-30 cm layer, was explained by clay contente, CTCpH7,0 and SB and for 0-90 cm layer by clay content. Increasing productivity of Area 1 showed a quadratic fit with increasing EC at both depths evaluated, in Area 2 increased productivity correlated linearly with increasing EC at both depths.O uso de técnicas de sensoriamento remoto pode eliminar a necessidade de extensivas amostragens na lavoura diminuindo o custo da amostragem além de aumentar a acurácia dos resultados obtidos. Nesse contexto, o presente trabalho teve os seguintes objetivos: I- avaliar a eficácia de um sensor óptico na determinação do estado nutricional nitrogenado na cultura do algodoeiro submetido a diferentes doses de N e correlacionar com a produtividade da cultura. II- determinar a condutividade elétrica em duas áreas de classificação Latossolos, através do uso de sensor e relacionar esse índice com os demais parâmetros químicos do solo e com a produtividade da cultura do milho. Em relação ao objetivo I, o experimento foi conduzido no ano agrícola de 2012/13 em um Latossolo Vermelho Amarelo com a cultura do algodoeiro. O Delineamento experimental foi em blocos ao acaso, com sete tratamentos e três repetições. Os tratamentos consistiram das seguintes doses de N: 0, 45, 90, 130, 150, 180 e 220 kg ha-1 aplicados aos 43 dias após semeadura (DAS). As leituras de índice de vegetação foram realizadas em três épocas, correspondentes aos 63, 75 e 97 DAE com o sensor óptico N-Sensor ALS® (YARA). Em relação ao objetivo II foi avaliada a condutividade elétrica de duas áreas com uso do sensor Veris® 3100, para as profundidades de 0-30 cm e 0-90 cm. As avaliações foram realizadas no ano agrícola de 2012/13 e a cultura cultivada, em ambas as áreas, foi a do milho. Os parâmetros químicos do solo e a condutividade elétrica foram comparados pelo método de regressão múltipla do tipo stepwise‟. Sobre o objetivo I, a leitura do índice de vegetação do sensor apresentou alta correlação com as doses de N nos três estágios avaliados, essa correlação também foi verificada com os parâmetros altura de planta, massa seca e N absorvido. A maior produtividade da cultura do algodão foi alcançada com a dose de 152 kg ha-1 de N. Com relação ao objetivo II, a CE da Área 1 para a camada de 0-30 cm foi explicada pelos fatores V% e Mg e para a camada de 0-90 cm pelo fator SB. Para a Área II a CE na camada de 0-30 cm foi explicada pela argila, CTCpH7,0 e SB e para a camada de 0-90 cm pelo teor de argila. O aumento da produtividade da Área 1, apresentou ajuste quadrático com o aumento da CE em ambas as profundidades avaliadas, já na Área 2, o aumento da produtividade se correlacionou linearmente com o aumento da CE em ambas as profundidades.
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Vizcarra, Arapa Santiago, et Cabrera Ismael Lorenzo Lujan. « Análisis experimental de las características mecánicas de la subrasante arcillosa del camino vecinal N° SM-707 Tarapoto – San Francisco de Río Mayo estabilizada con 3% de cal tras la adición de Cenizas de Cáscara de Arroz (CCA) ». Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/656757.
Texte intégralRésumé :
Existen estudios sobre las mejoras mecánicas que le brinda la adición de cal y Ceniza de Cáscara de Arroz (CCA) a los suelos arcillosos -naturalmente plásticos- con más de 70% de material fino en su composición. Sin embargo, para el comportamiento de arcillas arenosas, cuyo porcentaje de granos gruesos en su estructura superan el 40%, hacen falta más referencias. En la investigación se evalúa la influencia de la adición de CCA a esta clase de suelo, estabilizado con 3% de cal. El suelo estabilizado (sin CCA) incrementó 11.2 veces su valor de CBR natural; al agregarle la adición, el CBR incrementó solo en 1.56%. Al adicionarle 28% de CCA se observó un decrecimiento en su resistencia. Por otro lado, según la clasificación AASHTO, la trabajabilidad del suelo estabilizado fue mejorando a medida que se incrementó la adición de CCA, llegando a valores de IG=0. La mejor performance del suelo estabilizado se obtuvo con 16% de CCA, alcanzando 51.3% de CBR, 1.65g/cm3 de MDS y 15.8% de OCH. El CBR de este suelo estabilizado con cal y con la adición de CCA no proyecta mejoras mecánicas sustanciales, por más que demuestre una mejor trabajabilidad, la estabilización con cal de este tipo de suelos resulta suficiente para una buena performance.There are many studies about how the addition of lime and Rice Husk Ash (RHA) gives the soil a better mechanical behavior, particularly on clayey soils, where usually fine particles reach more than 75%. However, the soils with a small presence of fine particles (59-60%) do not have much research. This investigation evaluates the influence that RHA has on this kind of soil previously stabilized with 3% of lime. After the initial mix of soil-lime, the CBR increased 11.2 times its initial value; within the addition of the ash, the CBR maxed out its value increasing just 1.56%. When 28% of RHA was added, a decay in the value of CBR was noticed. Otherwise, soil workability improved and following the AASHTO standards, the specimens with more ash resulted in a more granular material, with a group index value of 0. The greatest CBR record was obtained when the stabilized soil was added a 16% RHA, reaching a 51.3% CBR, 1.58g/cm3 of MDD and 16.5% of OMC. The CBR of the soil stabilized with lime and the addition of RHA, does not shows substantial improvement, and beyond that the workability seems better, the addition of lime by itself should be enough for an adequate performance for silica-rich clayey soils.
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Diagre, Denis. « Le jardin botanique de Bruxelles (1826-1912) : miroir d'une jeune nation ». Doctoral thesis, Universite Libre de Bruxelles, 2006. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210873.
Texte intégralLivres sur le sujet "Clay Club (N.Y.)"
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Boyle, Patricia. The socks 'n sandals club. Kitchener, ON : P. Boyle, 2006.
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Fiddian, Marc. Moulded from clay : A history of the Brunswick Football Club. Forest Hill, Vic : Raccoon Tail Books, 2009.
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Fiddian, Marc. Moulded from clay : A history of the Brunswick Football Club. Forest Hill, Vic : Raccoon Tail Books, 2009.
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Grogan, Robert. Blood, sweat 'n' cheers. Middle Park, Vic : Lothian Custom Publishing, 2012.
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Baldwin, Kevin. Norfolk 'n' good : A supporter's view of Norwich City's best-ever season. London : Yellow Bird, 1993.
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Gall, Dolores M. The New Haven Paint & Clay Club 100th anniversary exhibition : September 10-October 22, 2000. New Haven, Conn : New Haven Paint & Clay Club, 2000.
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Club, Barnard Zine. Sticks & Stones : Thrills 'N Chills. New York, NY : The club, 2016.
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Sbitnev, Ivan. Spokoĭno, detka ! : Ėto rok-n-roll ! I︠A︡roslavlʹ : "T︠S︡ifrovai︠a︡ tipografii︠a︡", 2020.
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30/50 club : A dialogue on S. Korea U.S., China, and N. Korea (for truth, empathy, and future harmony!). Seoul : Korean literature Inc., 2019.
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Victoria Skating Club (Saint John, N.B.). Act of incorporation, bye-laws and list of shareholders of the Victoria Skating Club of Saint John. [Saint John, N.B. ? : s.n.], 1986.
Trouver le texte intégralChapitres de livres sur le sujet "Clay Club (N.Y.)"
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Olutoye, M. A., F. Aberuagba et J. O. Odigure. « Catalytic Dehydrogenation of n-Butane over Activated Clay ». Dans Advanced Materials Research, 225–31. Stafa : Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-450-2.225.
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Hudson, Berkley. « Seven Bellhops and Gilmer Hotel Manager, circa 1930 ». Dans O. N. Pruitt's Possum Town, 126–33. University of North Carolina Press, 2022. http://dx.doi.org/10.5149/northcarolina/9781469662701.003.0013.
Texte intégralRésumé :
The Gilmer Hotel was a central spot for white power brokers, women’s club luncheons, and visiting travelers. Pruitt often took pictures there, whether it was politicians making speeches or white women eating in the Gardenia Room. The four-story hotel was made from clay hand-dug by Black slaves in 1860. During the Civil War, the hotel was converted into a hospital. The cast of characters visiting the Gilmer was remarkable. These included President William Taft, boxer Jack Dempsey, and actors Clark Gable and Doris Day. William Faulkner, an occasional visitor, captured the hotel’s spirit. in an April 1954 Holiday magazine essay. Faulkner wrote about leaving the Gilmer to get moonshine whiskey at a bootlegger’s in nearby Alabama hills. A decade after Pruitt photographed seven bellhops and hotel manager J.O. Slaughter, Slaughter helped bellhop Edward C. Bush and his wife Bessie secure a loan to renovate a hotel in a Black neighborhood. In 1947 the Bushes reopened the Queen City Hotel, one of the few Mississippi hotels for Blacks and listed in the Negro Travelers’ Green Book. Musicians B. B. King, Count Basie, and Marian Anderson and baseball player Jackie Robinson were among the Queen City’s guests.
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« club, n. » Dans Oxford English Dictionary. 3e éd. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/6402163434.
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« clay, n. » Dans Oxford English Dictionary. 3e éd. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/4305580798.
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« gun club, n. » Dans Oxford English Dictionary. 3e éd. Oxford University Press, 2024. http://dx.doi.org/10.1093/oed/8633817521.
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« breakfast club, n. » Dans Oxford English Dictionary. 3e éd. Oxford University Press, 2024. http://dx.doi.org/10.1093/oed/9550970987.
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« break-club, n. » Dans Oxford English Dictionary. 3e éd. Oxford University Press, 2024. http://dx.doi.org/10.1093/oed/8573386651.
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« holiday club, n. » Dans Oxford English Dictionary. 3e éd. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/3816806378.
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« Boys' Club, n. » Dans Oxford English Dictionary. 3e éd. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/2854123693.
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« club-hopping, n. » Dans Oxford English Dictionary. 3e éd. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/8690089512.
Texte intégralActes de conférences sur le sujet "Clay Club (N.Y.)"
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Syamsuddin, Syamsuddin, Jusman Jusman et Alpin Alpin. « Desorption β-carotene of crude palm oil from clay using n-hexane ». Dans THE 3RD INTERNATIONAL SEMINAR ON SCIENCE AND TECHNOLOGY 2021 : The Path of Sustainable Development for a Better Life. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0133519.
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Kalasani, Naveen, Praveen V. Naidu, B. Pooja, B. Kumar Sai, Dudi Neelima et Arvind Kumar. « ACS Fed Four-Antenna Dual Band Club Shaped MIMO for IEEE802.11g/n/ac/ax WLAN and WiMAX Applications ». Dans 2022 IEEE North Karnataka Subsection Flagship International Conference (NKCon). IEEE, 2022. http://dx.doi.org/10.1109/nkcon56289.2022.10126521.
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Jeevanantham, V. « Empirical Modeling on Swell Pressure of Clay using Index Properties ». Dans Sustainable Materials and Smart Practices. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901953-46.
Texte intégralRésumé :
Abstract. Expansive soils undergo volume expansion, when it gains moisture content. Light structures constructed on this type of soil will be lifted by the upward swell pressure. Swelling characteristics decides the degree of safety of structures resting on expansive soil strata. Predicting the swell pressure of the soil consumes nearly 5 days of time (variable with respect to soil potential) in the laboratory as well as needs expensive testing setup. In our study, a correlation is proposed to develop for swell pressure using the index properties of soils namely liquid limit and plastic limit, which shall be assessed at the laboratory relatively short period of time. Swelling Pressure tests by Free Swell Method are performed on dynamically compacted 20 remolded soil samples collected within Coimbatore Corporation limit. The study area is between the four coordinates of 11008'49.25'' N 76053'36.28'' E, 11012’05.58’’ N76055'57.84'' E, 10059'16.52'' N 76052'17.47'' E, 10057'00.59'' N 76057'43.71'' E. Laboratory experimental data given as input in MATLAB gives satisfactory results and correlation is extracted from curve fitting method.
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Conlin, S. H., M. G. Jefferies et W. P. Maddock. « An Assessment of the Behaviour of Foundation Clay at Tarsiut N-44 Caisson Retained Island ». Dans Offshore Technology Conference. Offshore Technology Conference, 1985. http://dx.doi.org/10.4043/4884-ms.
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Shi, Ji, Yesul Cho, Meghan Taylor et David Correa. « Guiding Instability A craft-based approach for modular 3D clay printed masonry screen units ». Dans 37 Education and Research in Computer Aided Architectural Design in Europe and XXIII Iberoamerican Society of Digital Graphics, Joint Conference (N. 1). São Paulo : Editora Blucher, 2019. http://dx.doi.org/10.5151/proceedings-ecaadesigradi2019_522.
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Mirkalaei, Seyed Mousa Mousavi, David Tran, Vijay Shrivastava, Long Nghiem, Prasanna Chidambaram, Siti Syareena M. Ali, Abdul Hakim Mazeli et Tan Chee Phuat. « New Approach for Stress Computation during Loading and Unloading in Modified Cam Clay Model ». Dans International Geomechanics Symposium. ARMA, 2022. http://dx.doi.org/10.56952/igs-2022-177.
Texte intégralRésumé :
Abstract Modified Cam-Clay model is often used for simulation of soft geomaterials such as soil or sand. In this model, Young’s modulus continuously changes via the bulk modulus. Poisson’s ratio can change or be kept constant. If the Poisson’s ratio is kept constant, shear modulus will change with time. If the shear modulus is kept constant, Poisson’s ratio is allowed to change with time. In general, the effective stress tensor at time t+1 can be computed when all state variables at time t are known. The material can be either in elastic or plastic mode depending on the stress state. In the case of plasticity, there are many steps involved to obtain a correct stress so that the equilibrium force balance could be satisfied within a tolerance. In the case of plastic deformation when the stress is out of a yield surface at time t+1, the stress must be brought back to the yield surface. The stress computation procedure during loading and unloading has an important effect on the results of deformation and rebounding after a plastic deformation. In this study a new approach for stress computation during loading and plastic unloading path is introduced. In the new proposed method, the relationship between mean effective stress change and volumetric strain change is used as a parameter to determine the amount of plastic deformation during unloading. The new approach will be appropriate for any case with large residual strain and a proposed exponential parameter (n) will determine based on the value of residual strain. A sensitivity analysis was carried out for different values of the exponential parameter which showed the displacement to be gradually less sensitive when the value of the parameter “n” is 1.003 or higher during the unloading stage. This method was then implemented and successfully tested for a study on matured offshore Malaysian field.
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Cardozo, Gary Stephen Servin, et Luis Miguel Sandoval Vera. « Creation of a robotics club in the Universidad Nacional de Asunción based on the experience of horizontal learning in the University of Buenos Aires ». Dans 2012 Workshop on Engineering Applications (WEA). IEEE, 2012. http://dx.doi.org/10.1109/wea.2012.6220099.
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Haraguchi, Kazutoshi, et Toru Takehisa. « Novel Manufacturing Process of Nanocomposite Hydrogel For Bio-Applications ». Dans ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80533.
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A novel class of nanocomposite hydrogels (NC gels) with a unique organic / inorganic network structure was synthesized by in-situ free-radical polymerization of N-isopropylacrylamide (NIPA) or N,N-dimethylacrylamide (DMAA) in the presence of inorganic clay (hectorite). Since NC gels are composed of a unique organic / inorganic network structure, which consists of exfoliated clay platelets uniformly dispersed in an aqueous medium with a number of flexible polymer chains linking them together, NC gels exhibit high transparency, high degrees of swelling, and superb mechanical properties with extraordinarily large deformations. Also, NC gels formed from thermo-sensitive polymers, e.g. PNIPA, exhibit rapid temperature-response in transparency and gel volume (de-swelling) at the lower critical solution temperature (LCST). All the properties of NC gels are very different from those of conventional, chemically-crosslinked hydrogels (OR gels). Here, we evaluated various properties of NC gels from a biomaterials point of view, such as mechanical toughness (capable of sewing), absorption (water and saline), purification and extraction, drying (effect of cover film), coexistence of absorption and drying, sterilization (by autoclave and γ-ray irradiation), preliminary implantation (implanted to rabbit intramuscularly) and blood compatibility. These results indicate that NC gels are promising as soft biomaterials with blood compatibility as well as high transparency, absorbing power and mechanical properties.
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Andertova´, Jana, et Frantisˇek Rieger. « Rheology and Rotational Rheometry of Concentrated Clay Based Ceramic Suspensions : Steps From Measured to Relevant Data ». Dans ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38487.
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The rheological behavior of ceramic suspensions affects significantly wet ceramic processing. On the base of knowledge of rheological parameters the technological parameters of various processes (mixing, batching, spray drying, slip casting, of rheological parameters the selection of proper geometry and sensors must be done. From the data measured the flow curves must be designed and parameters of appropriate rheological models must be calculated. The power-law is the simplest model mostly used for description of rheological behavior of non-Newtonian fluids. Using this model, the dependence of shear stress on shear rate can be expressed. The aim of this paper is to show how the flow curves necessary for parameters of rheological model evaluation can be obtained from primary experimental data received from measurements on rotational viscometer. The two arrangements of rotational viscometer method were used in rheological measurements. The procedure of experimental data to obtain parameters K (coefficient of consistency) and n (flow behavior index) is presented.
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ARLAUSKIENĖ, Aušra, Viktorija GECAITĖ et Danutė JABLONSKYTĖ-RAŠČĖ. « THE EVALUATION OF THE COMPATIBILITY OF CEREAL AND GREEN MANURE ON THE BASIS OF NUTRIENTS ». Dans RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.039.
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Research was carried out at the Lithuanian Research Centre for Agriculture and Forestry’s (LAMMC) Joniškėlis Experimental Station on a clay loam Endocalcari Endohypogleyic Cambisol. The study was aimed to explore the aboveground mass of perennial forage legumes: red clover (Trifolium pratense L.) and lucerne (Medicago sativa L.), and their mixtures with festulolium (x Festuliolium), used as green manure, qualitative parameters and compatibility with cereals on the basis of nutrients nitrogen (N), phosphorus (P) and potassium (K). The deficiency of other nutrients (P, K) and intensity of green manure mineralization can lead to N absorption. It has been determined that winter wheat takes one kg of N together with 0.2 kg P and 0.6 kg K. Spring wheat requires a similar amount of P but a higher amount of K. Average winter wheat grain yield can be 4.0 t ha-1 on a clay loam Cambisol in organic cropping system. NPK content – 134 kg ha-1 is needed for such productivity (grain + straw). This content is lower for spring winter growing. P:N and K:N ratios are more favourable in perennial forage legume mixture with festulolium, as compared to legume alone. To obtain grain yields of 4 t ha-1 of winter wheat and 3 t ha-1 of spring wheat in balanced organic crop rotation it is sufficient to apply 3.0 and 2.0 t ha-1 DM of pure legume mass as green manure. “Cut-and-carry” fertilisers do not satisfy the wheat demand for P.
Rapports d'organisations sur le sujet "Clay Club (N.Y.)"
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Stuedlein, Armin, Ali Dadashiserej et Amalesh Jana. Models for the Cyclic Resistance of Silts and Evaluation of Cyclic Failure during Subduction Zone Earthquakes. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, avril 2023. http://dx.doi.org/10.55461/zkvv5271.
Texte intégralRésumé :
This report describes several advances in the cyclic failure assessment of silt soils with immediate and practical benefit to the geotechnical earthquake engineering profession. First, a database of cyclic loading test data is assembled, evaluated, and used to assess trends in the curvature of the CRR-N (cyclic resistance ratio - the number of equivalent cycles) relationship. This effort culminated in a plasticity index-dependent function which can be used to estimate the exponent b in the power law describing cyclic resistance, and may be used to estimate the cyclic resistance of silt soils as well as the number of equivalent loading cycles anticipated for subduction zone earthquakes. Statistical models for the cyclic resistance ratio and cyclic strength ratio are presented in this report. The SHANSEP (Stress History and Normalized Soil Engineering Properties)-inspired functional form of these models have been trained and tested against independent datasets and finalized using a combined dataset to provide reasonable estimates of resistance based on the available data. These models can be used to provide provisional estimates of the CRR-N and cyclic strength ratio power laws for cyclic shear strain failure criteria ranging from 1 to 10%, within certain stated limitations. The ground motion records within the NGA Subduction Project which have been released to the public to-date are implemented to examine the role of subduction zone earthquake characteristics on the number of equivalent loading cycles for a wide range of soils with exponents b ranging from 0.05 (moderate plasticity silt and clay) to 0.35 (dense sand). This analysis shows that the number of loading cycles for a given magnitude subduction zone earthquake is larger than those previously computed, whereas the corresponding magnitude scaling factors for use with the Simplified Method span a smaller range as a result of the ground motion characteristics. Owing to the large variability in the computed equivalent number of loading cycles, consideration of the uncertainty is emphasized in forward analyses. The work described herein may be used to estimate cyclic resistance of intact non-plastic and plastic silt soils and corresponding factor of safety against cyclic failure for a range in cyclic shear strain failure criteria, to plan cyclic laboratory testing programs, and to calibrate models for use in site response and nonlinear deformation analyses in the absence of site-specific cyclic test data. As with any empirical approach, the models presented herein should be revised when additional, high-quality cyclic testing data become available.