1,720,979 research outputs found
Water Table Management For Upland Crops: A Theoretical Modelling Investigation
Get PDFThis study discusses some aspects of water table management for upland crops in the abandoned rice fields of shallow field water tables. As upland crops are gaining importance to rice farmers as part of the crop diversification programme, a technical support on how to manage the water resources optimally for plant growth would be extremely valuable. A theoretical investigation based on soil-water balance model in the root zone and water table draw-down is presented. The result is used to formulate the necessary water table control suitable for upland crops. A practical application is demonstrated by the translation of the concluding formula into a local data
Hydrologic characteristics and time series modelling of a drained peat catchment in Johor, Malaysia
No full textSteady state open drainage system for minimizing fire hazard on peat areas
Get PDFThe principle of steady state drainage theory was employed to estimate an appropriate open drainage system on peatJand. It is aimed at minimizing the occurrence of fire hazard that frequently happened on peat areas especially during the dry spell. Computation analysis shows that a certain open drainage design is required in order to keep the water table high, so that a fire could be . minimized. Besides drain spacing. other physical parameters associated to peat soil are also required to materialized the theory. Depending on the size of the drains. the hydrogeological propertie s of the peat materials and the design drainage rate, a drain spacing between 51 to 525m would be required to accommodate the fire control on peat
Moisture retension curve of tropical sapric and hemic peat
Get PDFThis paper presents the preliminary result from a laboratory study to establish the moisture retention curve of undisturbed tropical peat samples classified as Sapric and Hemic. The results obtained were compared with those of the temperate peat. Under the same suction head, tropical peat seems to hold more water. The soil moisture at permanent wilting point (-15000 cm or -150 kPa) was still relatively high at 50-60 % volumetric indicating that the soil was still visually wet, but may not be available for plant use. The possible implication could be, water table in the field should be maintained optimally high to facilitate irrigation water supply from capillary rise
Water Use Trend At Universiti Teknologi Malaysia: Application Of Arima Model
Get PDFThe Paper Describes The Application Of Autoregressive Integrated Moving Average (ARIMA) Model To Represent Water Use Behaviour At Universiti Teknologi Malaysia (UTM) Campus. Using Autocorrelation Function (ACF), Partial Autocorrelation Function (PACF), And Akaike’s Information Criterion (AIC), Monthly Campus Water Use Series Can Be Best Presented Using ARIMA (2,0,0) Model. The Estimated Parameter Of The Model ö1 And ö2 Are 0.2747 And 0.4194 Respectively. This Implies That Water Consumption In UTM Campus At The Present Month Is Not Necessarily Influenced By Water Consumption Of Immediate Previous Month. Analysis Shows That ARIMA (2,0,0) Model Provides A Reasonable Forecasting Tool For Campus Water Use
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
A study of flow theory towards the different degree of tropical peat decomposition
Get PDFExisting literature suggest that Darcys Law is not valid in different degree of decomposition of peat soil. The present attempts to validate the applicability of Darcys Law by comparing the velocity predicted by Darcys Law and the velocity obtained through experiment for a peat soil column. The suitability of Izbashs Law to predict the flow through peat soil column of different degree of decomposition was tested by determining the Izbashs parameter, n. Izbashs Law (v=kin) was preferred because of its continuity with the Darcys Law. Soil columns studies were set-up by applying different value in hydraulic gradient in order to obtain discharge velocity, v, of thesample. From the result, it is expected to find the suitable Izbashs parameter, n, for each depth of peat soil profile of different decomposition stage. The overall result of the study suggests that the Izbash or Power Law provides a much better approximation of water flow thorugh much deeper peat layer
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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