2,383 research outputs found
C.J. Koch (1932 - )
No full textBiographical, bibliographical, and literary historiography of Australian author C.J. Koch
Infiltration characteristics of furrow irrigation in a heavy-textured soil
No full textThe objective of this thesis is to study the rate and pattern of infiltration of soil water, under the conditions of heavy texture and shallow depth in a tropical furrow- irrigated soil. The analysis is the result of a series of field-experiments and is supported by theories that has been proposed by others.The experiments were carried out in the Cojedes-Sarare Irrigation Project, Portuguesa State, Venezuela. Furrows with a length of 200 m, spaced at w = 0.70 m, and with an average slope of 0. 18 % were used. Three series of experiments were set out: (i) First series with variable inflow and surface roughness; (ii) Second series with variable initial soil moisture content; (iii) Third series with variable furrow length. Replicates of the treatments were distributed at random.Five irrigations were applied to the land during the period from January to March, 1970. Subsequently in the first series of experiments, first, third and fourth irrigations for three roughness conditions and four sizes of flow were tested. The second irrigation was used for the second series of experiments. The fifth irrigation served for the third series of experiments.During the first series of experiments, the following measurements were taken: (i) rate of advance of the water front (distance x in m at time t in min); (ii) furrow section parameters (top width T and depth h ); (iii) furrow inflow Q and outflow Q out . During the second and the third series of experiments, only the simultaneous inflow and outflow were recorded.Advance and infiltration functions were obtained for the period of advance of the water front (first stage), and infiltration functions for the period of wetting the root zone (second stage). Exponential equations were obtained by computer analysis for single furrow trials. Then, by averaging coefficients and exponents of the equations of the replicates, general equations for each treatment were found.The data of x as a function of t showed a good fit with the equation x = p t r . The coefficient p increased significantly with the flow size Q and the exponent r showed a trend to decrease although not significantly, with increasing Q . The coefficients of variation of p and r were rather high. Therefore a single furrow advance trial may not suffice to express the average field advance of the water front under the given conditions.The advance curves showed that the differences in roughness were great between the first irrigation with loose furrows and those irrigations after two or three applications have taken place. The roughness conditions appeared to be identical for third and fourth irrigations.With distance-averages of the furrow section parameters h and T , for three water front advance stages ( x = 87.5 m, x = 137,5 m and x = 175.0 m), the average section a f , and the average wetted perimeter P were obtained for a parabolic section of the furrows. The surface volume V f = a f p t r , and the area of infiltration A i (net area A in = P pt r and gross area A ig = w pt r ) were then arrived at.The infiltration functions were found for each treatment during the first stage, as V i= f(t) by using single furrow data of V i = Q t - V s ,. As the average infiltration depth I cum = V i / A i , the equations for I cum= f(t) were obtained. Equating these functions with the equation I cum = F at b+1/( b + 1) ( b + 2), the parameters a and b of the Kostiakov equation ( I = a t b ) were derived. For the second stage (when x = L = 175.0 m), the infiltration function was obtained by simultaneous measurements of the inflow and outflow, as infiltration flow: Q i = Q - Q out , from which the parameters of the infiltration equations, were found.The increase of infiltration with inflow size was clearly shown from the data analysis of both stages as being the effect of a larger volume of water. The parameters of the infiltration equation for the first stage altered in successive irrigations.Some emphasis was put on the unit inflow function q0 to relate flow sizes for both stages with length of run and infiltration. Equations for the unit inflow q0 = Q / A i and for unit infiltration flow q i = Q i / A i per unit area, were obtained for each treatment. Then a generalized type of equation was introduced which relates the unit inflow function with the average depth of water infiltrated during the advance time at the furrow intake. An equation to predict the length of advance is included x = φ( Q ) t 0.927, for the surface roughness and soil conditions under which the experiments were carried out. The representation of q0= f(t) and q i = f(t) for both stages, in a composite figure with the advance function as a function of time, provides an illustration of the infiltration process, usable for the design and management of furrow irrigation under the conditions of the experiments.The relationship between the exponent of time in the advance equation and the exponent of time in the infiltration equation was analysed with the data from the experiments. This analysis confirmed that r increases when ( b + 1) decreases. This agrees with findings in the literature, such as the relationship proposed by FOK and BISHOP (1965) Values for the surface storage coefficient C 1 = D / D0 , and infiltration coefficient C 2 = I cum / I cum0 to solve the balance equation for predicting advance were also obtained.The second series of experiments, in which infiltration rate was measured during the second stage, as a function of the initial moisture content, showed that the value of the coefficient a of the Kostiakov equation increased not significantly as the initial content of soil moisture decreases.The third series of experiments - measurements taken during the second stage - showed that upon the increase of furrow length, the coefficient a of the infiltration equation decreases and the exponent b increases.Water losses by deep percolation and by run-off at the end of the run, were finally analysed on the bases of the equations found and the data available. The analysis was made for the case of constant inflow for both stages (third irrigation), and for the case of reduced inflow during the second stage (fourth irrigation).The data analysis showed that infiltration is a very variable factor affected by the conditions of the soil and the surface of the channel bed, as well as by the size of the flow, furrow length and stage of irrigation. Soil cracking upon drying was found to be a relevant factor in the entry of water into the soil. Because deep percolation losses are certainly very small under the indicated physical conditions, irrigation efficiency will be rather high if provisions are made to use a cut-back stream, during the second stage, in order to lose a minimum of water by run-off at the end of the run
Audio Interview with Mr. C.J. Rayner Whiteley
No full textAudio - Mr. Whiteley recounts the story of delivering the message of the flood of 1904. He took seventeen hours by horse to travel from Perryvale to Edmonton. Billy Loutit took the same message by foot arriving in Edmonton about the same time. Mr. Whiteley discusses early settlers, farming, homesteading and businesses. He has many anecdotes about life and people living in Athabasca at the start of the twentieth century. He freighted for ten years with the Hudson's Bay Company and also discusses early farming prices and technology extensivelyInformative Interview of Mr. C.J. Raymor Whitely In April 1961 on a Reel to Reel tape recorded onto cassette by R. Tanhas March 198
Specialty farming in Idaho: Selecting a site
No full textBulletin no. 744 Moscow, Idaho :University of Idaho, College of Agriculture, Cooperative Extension System, 1992-10-01. Author(s): Barney, D.L.; Finnerty, T.L.; Mancuso, C.J
The Actors' Perceptions and Expectations of their Roles in BIM-based Collaboration
No full textThe inter-organisational collaboration with Building Information Modelling (BIM) is one of the hottest topics in construction sector nowadays. The implementation of BIM is a complex inter-organisational process, and the sharing of information among numerous actors from multi-disciplinary backgrounds may affect the actors’ role perception and performance. This study offers insights into the BIM roles of various actors by analysing a BIM-based project carried out by an integrated partnership across many tiers. The analysis identified inconsistencies between the actors' perceptions and their partners’ expectations of their BIM roles. Inconsistencies in BIM roles were more related to soft rather than hard (domain- or technical) skills. Mismatches were found in the architect's role, as it was deemed necessary to be more domain- and BIM-related, contrary to their perceptions. Likewise, the suppliers' role called for an enhanced BIM orientation. The paper concludes with set of suggestions for increasing the joint responsibility and supporting the multi-actor collaboration.Design & Construction ManagementSustainable Housing Transformatio
Strange Fellah! Review of Philip Butterss, An Unsentimental Bloke: The Life and Work of C.J. Dennis
No full textC.J. Dennis, author of The Songs of a Sentimental Bloke (1915), was once considered the unofficial poet laureate of Australia. Throughout his career he was erroneously conflated with his famous character 'the Bloke' in the public imagination. 'Many have imagined him as a sentimental bloke', argues Philip Butterss, 'an easygoing fellow with a naïve and slightly romantic view of the world'(1). Since three previous biographical works have the word 'sentimental' in the title, Butterss' decision to add the 'un' to 'sentimental' immediately signals his intention to examine the darker side of Dennis
) Corresponding author.
No full textwww.elsevier.comrlocatergeoderma 3D reconstruction and quantification of macropores using X-ray computed tomography and image analysis A. Pierret a,) , Y. Capowiez b, L. Belzunces b, C.J. Moran
The One, Two, Threes of Involuntary Bankruptcy: Creditor Numerosity in the Fifth Circuit
No full textIn The One, Two, Threes of Involuntary Bankruptcy: Creditor Numerosity in the Fifth Circuit, C.J. Baker examines how courts interpret and apply the creditor numerosity requirement under § 303(b) of the Bankruptcy Code in involuntary bankruptcy proceedings. The article focuses on the Fifth Circuit’s approach to determining how many qualified creditors must join an involuntary petition, particularly when disputes arise over counting eligible and disqualified creditors. Baker analyzes conflicting judicial interpretations and highlights the practical implications of these inconsistencies for creditors and debtors alike. The author critiques the Fifth Circuit’s reasoning in light of broader statutory and policy considerations, emphasizing the tension between procedural safeguards and creditor remedies. Ultimately, the article advocates for a more uniform and predictable standard to ensure fairness and efficiency in involuntary bankruptcy cases
An investigation of the oceanic skin temperature deviation
No full textSatellite and in-situ radiometric measurements of sea surface temperature (SST) together with conventional SST and meteorological parameters are used to provide a description of the ocean surface skin temperature deviation (skin temperature - bulk temperature, AT) for a transect made across the Atlantic ocean from 50°N 00°W to 23°S 35°W during September and October 1992. Methods of in-situ SST measurement are discussed and the errors associated with each technique are given. The principles of infra red radiometry are explained. The differences between the calibration strategies used to determine SST using infra-red radiometers from both in-situ and satellite platforms are reviewed and the errors associated with each technique are given. Differences between published in-situ infra red SST data indicate that there may be a bias in these data as a consequence of the calibration strategy adopted. The need for an inter calibration of in-situ infra red radiometer systems used for the validation of satellite SST is highlighted. Satellite SST algorithms are discussed and the principles of atmospheric correction are explained. The difference between the radiometric 'skin' temperature of the ocean and the conventional 'bulk' temperature at depth is defined. A review of current observations of AT is given. Several theoretical treatments of AT are reviewed. The definitions of the surface fluxes of heat and momentum are given. A description of the collection of data and an analysis of the calibration of the infra-red radiometer used to measure the skin temperature is presented.Data have been processed to obtain AT and the surface fluxes of heat and momentum have been evaluated according to the bulk aerodynamic formulae. The relationships between AT and the measurements made are presented for the entire data set and for day and night time observations separately. Four time series of observed data are presented and the local conditions during the time of measurement are used to discuss AT. AT has a mean value of 0.39°C ±0.3°C and is shown to be a persistent feature of the Atlantic ocean. Correlation analyses reveal the skin and bulk temperature fields to be correlated at length scales > 155 km. Night time correlations are consistently higher than the day time at all length scales. For this reason it is recommended that satellite validation data are only collected during the night. High sea states are shown to affect both in-situ and satellite observations of SST biasing these data warm. The regional nature of AT is presented which is related to the dominant atmosphere-ocean conditions for each region. AT is shown to be greatest at the higher latitudes and weak in the tropical regions.Several parameterisations of AT are used to obtain estimates of AT using the data collected. These are found to be inadequate to predict AT at small temporal scales. A regional dependence of AT is found in these parameterisations. The coefficient A, of the Saunders (1969) parameterisation has been evaluated and is shown to have a regional dependence on the local atmosphere ocean conditions. The coefficient Ci and Ci of the Hasse (1971) parameterisation have been evaluated using the data collected. These are Ci=4.74 and C2=1.22.A comparison between the Along Track Scanning Radiometer Average SST is presented. Satellite - in-situ bulk AT has been obtained and shown to be comparable to that observed in-situ. This comparison highlights the need to make skin SST validation measurements rather than bulk SST measurements. The ATSR ASST data are shown to return a SST accurate to better than 0.3°C
Morphological Impacts of Porcupine River Training Structures
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Rivers, Ports, Waterways and Dredging Engineerin
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