78,173 research outputs found
Non-discursive knowledge and the construction of identity. Potters, potting and performance at the bronze age tell of Százhalombatta, Hungary
No full textThis article explores the relationship between the making of things and the making of people at the Bronze Age tell at Százhalombatta, Hungary. Focusing on potters and potting, we explore how the performance of non-discursive knowledge was critical to the construction of social categories. Potters literally came into being as potters through repeated bodily enactment of potting skills. Potters also gained their identity in the social sphere through the connection between their potting performance and their audience. We trace degrees of skill in the ceramic record to reveal the material articulation of non-discursive knowledge and consider the ramifications of the differential acquisition of non-discursive knowledge for the expression of different kinds of potter's identities. The creation of potters as a social category was essential to the ongoing creation of specific forms of material culture. We examine the implications of altered potters' performances and the role of non-discursive knowledge in the construction of social models of the Bronze Ag
Crushed rock and clay amelioration of a nutrient decifient, sandy soil of Maputaland
No full textBibliography: leaves 57-62.Various studies have suggested the possibility that food derived through subsistence agriculture in the Mseleni region of Maputaland contributes to malnutrition within the local community, particularfy within the high proportion of the population which suffers from a severe, disabling form of osteoarthritis. This study was conducted to determine if the application of local crushed rock or black clay to these nutrient deficient, sandy soils would increase available nutrient concentrations and improve the growth of plants in the ameliorated soil
The Benefits of Being Economics Professor A (and not Z)
No full textAlphabetic name ordering on multi-authored academic papers, which is the convention in the economics discipline and various other disciplines, is to the advantage of people whose last name initials are placed early in the alphabet. As it turns out, Professor A, who has been a first author more often than Professor Z, will have published more articles and experienced afaster growth rate over the course of her career as a result of reputation and visibility. Moreover, authors know that name ordering matters and indeed take ordering seriously: Several characteristics of an author group composition determine the decision to deviate from the default alphabetic name order to a significant extent.performance measurement, incentives, economists, name ordering
Final word on Jersey Dutch
No full textIn this article, William Z. Shetter compares and contrasts the dialects that developed between different Dutch colonies in the New World. He explores in-depth the nuances of Jersey Dutch, and provides theories to explain how Dutch and colonial languages blended. The article is reprinted from American Speech, December 1958, Volum XXXIII, No. 4
Multiple benefits of manure: the key to maintenance of soil fertility and restoration of depleted sandy soils on African smallholder farms
No full textManure is a key nutrient resource on smallholder farms in the tropics, especially on poorly buffered sandy soils, due to its multiple benefits for soil fertility. Farmers preferentially apply manure to fields closest to homesteads (homefields), which are more fertile than fields further away (outfields). A three-year experiment was established on homefields and outfields on sandy and clayey soils to assess the effects of mineral nitrogen (N) fertilizer application in combination with manure or mineral phosphorus (P) on maize yields and soil chemical properties. Significant maize responses to application of N and manure were observed on all fields except the depleted sandy outfield. Large amounts of manure (17 t ha¿1 year¿1) were required to significantly increase soil organic carbon (SOC), pH, available P, and base saturation, and restore productivity of the depleted sandy outfield. Sole N as ammonium nitrate (100 kg N ha¿1) or in combination with single superphosphate led to acidification of the sandy soils, with a decrease of up to 0.8 pH units after three seasons. In a greenhouse experiment, N and calcium (Ca) were identified as deficient in the sandy homefield, while N, P, Ca, and zinc (Zn) were deficient or low on the sandy outfield. The deficiencies of Ca and Zn were alleviated by the addition of manure. This study highlights the essential role of manure in sustaining and replenishing soil fertility on smallholder farms through its multiple effects, although it should be used in combination with N mineral fertilizers due to its low capacity to supply N
Accuracy analysis of the tyre-soil models to the conditions of the loosened light sandy soil
No full textW pracy przedstawiono analizę dokładności znanych modeli układu koło - podłoże dla warunków ruchu kół po spulchnionej glebie lekkiej. Obliczone z modeli w badaniach symulacyjnych takie parametry jak głębokość koleiny, opór toczenia i siła uciągu kół, na podstawie parametrów opon i parametrów trakcyjnych gleby wyznaczonych doświadczalnie, odniesiono odpowiednio do rezultatów badań empirycznych. Wykazano małą dokładność analizowanych modeli z wyjątkiem uwzględniających wiele parametrów opon i podłoża modeli Błaszkiewicza opartych o metody numeryczne.In this work the accuracy analysis of the known tyre - soils models was performed to the conditions of the light sandy soil. The calculated values from the models of the traction parameters: tyre sinkage, rolling resistance and drawbar pull, on the basis the tyre and traction soil parameters, were compared with the investigation results, respectively. It was stated the small accuracy of the models other authors in the analysed soil conditions, exception of the Błaszkiewicz computer based models for the tyre sinkage and rolling resistance, included many tyre and soil parameters
Relationships between community structure of the intertidal macroinfauna and sandy beach characteristics along the Chilean coast
No full textEight sandy beaches were seasonally sampled along the coast of Chile, from ca. 21 to 42degrees S (about 3000 km) to study the relationship between community structure 2 of the intertidal macroinfauna and beach characteristics. Sediment samples (0.1 m(2), 30 cm deep) were collected (July-September 1998 and December 1998-January 1999) with plastic cylinders at 15 equally spaced levels along three replicated transects extending from above the drift line to the swash zone. The sediment was sieved through a 1 mm mesh and the organisms collected stored in 5% formalin. To define beach types, Dean's parameter (0) was calculated from wave heights and periods, and fall velocity of sand particles from the swash zone. Crustaceans (mainly peracarids) were the most diverse group with 14 species, followed by polychaetes with 5 species. The talitrid amphipod Orchestoidea tuberculata, the cirolanid isopods Excirolana braziliensis and E. hirsuticauda and the anomuran decapod Emerita analoga were the most widely distributed and common species. Regression analyses between species richness, abundance and biomass of the whole macroinfauna versus sediment characteristics, beach face slopes and morphodynamic beach states showed no significant relationships. Thus, macroinfaunal community characteristics did not increase linearly from lower intermediate to higher intermediate or dissipative beach states as had been found before in Chile or in other coasts. A comparative analysis with data from sandy beaches of other world regions showed that the number of species inhabiting Chilean sandy beaches was generally lower, whereas total population abundances were generally higher compared with values reported elsewhere.PT: J; CR: ANSELL AD, 1972, MAR BIOL, V17, P38 BRAZEIRO A, 1996, ESTUARINE COASTAL SH, V21, P587 BROWER JE, 1977, FIELD LAB METHODS GE CROKER RA, 1975, CAN J ZOOL, V53, P42 DEFEO O, 2000, MAR ECOL-PROG SER, V212, P159 DERUYCK AMC, 1992, CAH BIOL MAR, V33, P147 DUGAN JE, 1996, REV CHIL HIST NAT, V69, P579 DUGAN JE, 2000, 5 CAL ISL S, P339 EMERY KO, 1938, J SEDIMENT PETROL, V8, P105 EMERY KO, 1961, LIMNOL OCEANOGR, V6, P90 ETTER RJ, 1992, NATURE, V360, P576 FOLK R, 1980, PETROLOGY SEDIMENTAR FONSECA T, 1987, INVEST PESQ, V34, P33 GIBBS RJ, 1971, J SEDIMENT PETROL, V41, P7 GOMEZ J, 1999, MAR ECOL-PROG SER, V182, P209 JARAMILLO E, 1987, THESIS U NEW HAMPSHI JARAMILLO E, 1993, ESTUAR COAST SHELF S, V37, P615 JARAMILLO E, 1996, REV CHIL HIST NAT, V69, P641 JARAMILLO E, 1998, REV CHIL HIST NAT, V71, P459 JARAMILLO E, 2000, REV CHIL HIST NAT, V73, P771 JARAMILLO E, 2001, ECOL STU AN, V151, P61 MCLACHLAN A, 1990, J COASTAL RES, V6, P57 MCLACHLAN A, 1993, J COASTAL RES, V15, P27 MCLACHLAN A, 1995, OCEANOGR MAR BIOL, V33, P305 MCLACHLAN A, 1996, REV CHIL HIST NAT, V69, P451 MCLACHLAN A, 1998, J COASTAL CONSERVATI, V4, P181 SEWARDTHOMPSON B, 1973, SEDIMENTOLOGY, V11, P83 SHORT AD, 1983, SANDY BEACHES ECOSYS, P133 SOKAL RR, 1995, BIOMETRY PRINCIPLES; NR: 29; TC: 11; J9: MAR ECOL-P S Z N I; PG: 20; GA: 509UHSource type: Electronic(1
PENGARUH PENERAPAN STRATEGI PEMBELAJARAN QUESTION STUDENT HAVE TERHADAP HASIL BELAJAR SISWA PADA MATA PELAJARAN FIQIH DI MADRASAH TSANAWIYAH MUHAMMADIYAH PENYASAWAN KABUPATEN KAMPAR
No full textABSTRAK
Sandy Amalia Z, (2022): Pengaruh Penerapan Strategi Pembelajaran Question Student Have terhadap Hasil Belajar Siswa Pada Mata Pelajaran Fiqih di Madrasah Tsanawiyah Muhammadiyah Penyasawan Kabupaten Kampar
Penelitian ini bertujuan untuk mengetahui pengaruh yang signifikan penerapan strategi pembelajaran Question Student Have terhadap hasil belajar siswa pada mata pelajaran Fiqih. Penelitian ini merupakan penelitian kuasi eksperimen yang dilakukan di Madrasah Tsanawiyah Muhammadiyah Penyasawan Kabupaten Kampar. Subyek dalam penelitian ini yaitu 38 siswa dengan rincian 19 siswa kelas VIII A eksperimen dan 19 siswa kelas VIII B kontrol. Data yang telah terkumpul dianalisis dengan menggunakan teknik t-test. Hasil penelitian diperoleh nilai thitung lebih besar dari ttabel pada taraf signifikansi 5%, dimana 7,687 > 2,028, yang berarti terdapat perbedaan hasil belajar siswa. Dengan demikian terdapat pengaruh yang signifikan sebelum dilakukan (Pre-test) strategi pembelajaran Question Student Have dan sesudah dilakukan (Post-test) strategi pembelajaran Question Student Have terhadap hasil belajar siswa pada mata pelajaran Fiqih. Kemudian diperoleh signifikansi nilai thitung lebih besar dari ttabel pada taraf signifikansi 5%, dimana 2,114 > 2,028, yang berarti terdapat perbedaan yang signifikan antara hasil belajar siswa yang diajarkan dengan menggunakan strategi pembelajaran Question Student Have dengan siswa yang diajarkan dengan strategi konvensional pada mata pelajaran Fiqih.
Kata Kunci: Strategi Pembelajaran Question Student Have, Hasil Belajar Sisw
The effectiveness of commercially available wetting agents for combating on-site soil water repellency in sandy soil
No full textSoil hydrophobicity reported to be a worldwide problem throughout the world and Australia affecting diverse soil types particularly soil with high sand content. Soil hydrophobicity affect surface and subsurface hydrology, enhance overland flow and soil erosion, reduce seed germination and crop growth, cause preferential flow and associated leaching of nutrients and agrochemicals. The cause of soil water repellency is believed to be organic coating of the soils particles result from breakdown of organic substances such as; plant roots, fungal or microbial by-products. The most common method of managing soil water repellency in urban areas is application of wetting agents most of which are surfactant based. A trial was conducted at Murdoch University to test the efficacy of three leading locally available commercial wetting agent products and their effect on three commercially available pre-mixed landscape soils. Results from capillary rise, WDPT and double ring infiltrometer tests suggest that; application of selected wetting agents not only did not result in enduring improvement in soil wettability, but also in some cases appear to enhance soil water repellency. These observations lead to the hypothesis that; surfactant molecules in the wetting agents bond to soil particles in the same way as organic hydrophobic materials that coat the soil grains. To substantiate the results, further investigation required to understand the mechanism by which wetting agent molecules interact with soil particles
Logarithmic variance profiles and the corresponding f-1 spectra of temperature fluctuations in turbulent Rayleigh-Bénard convection
No full textWe report experimental results for the temperature variance 2(z) and the corresponding frequency spectra P(f) in turbulent Rayleigh-Bénard convection (RBC) in a cylindrical sample of aspect ratioT= D/L = 1:00 (D = 1:12 m is the diameter and L = 1:12 m the height). The measurements were conducted in the Rayleigh-number range 1011 < Ra < 1:35 1014 and Pr ' 0:8. For Ra = 1:35x1014, 2(z) could be described well by a logarithmic dependence on the vertical position z in a range of z 1 < z < z 2 with z 1 ' 70 and z 2 = 0:1L. Here L=(2Nu) is the thickness of a thin thermal sublayer adjacent to the horizontal plate where the heat flux (denoted by the Nusselt number Nu) is carried mostly by thermal diffusion. In the log layer, we found that the temperature spectra had a significant frequency range over which P(f) f with close to 1. As Ra decreased, increased so that the log layer became thinner. At Ra = 2:05 1011, z 2 < z 1 and therefore there was no range for a log layer. Correspondingly, the temperature spectrum near the horizontal plate did not have the f1 scaling form either
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