J.R. O’Callaghan

798 total citations
34 papers, 641 citations indexed

About

J.R. O’Callaghan is a scholar working on Mechanical Engineering, Civil and Structural Engineering and Soil Science. According to data from OpenAlex, J.R. O’Callaghan has authored 34 papers receiving a total of 641 indexed citations (citations by other indexed papers that have themselves been cited), including 10 papers in Mechanical Engineering, 9 papers in Civil and Structural Engineering and 6 papers in Soil Science. Recurrent topics in J.R. O’Callaghan's work include Agricultural Engineering and Mechanization (5 papers), Geotechnical Engineering and Soil Mechanics (4 papers) and Soil and Unsaturated Flow (4 papers). J.R. O’Callaghan is often cited by papers focused on Agricultural Engineering and Mechanization (5 papers), Geotechnical Engineering and Soil Mechanics (4 papers) and Soil and Unsaturated Flow (4 papers). J.R. O’Callaghan collaborates with scholars based in United Kingdom, Ireland and Australia. J.R. O’Callaghan's co-authors include D.R.P. Hettiaratchi, J.L. Woods, P. R. Philips, T. H. Flowers, V.A. Dodd, K. K. S. Bhat, Z. Zhong and Youcai Liang and has published in prestigious journals such as Water Resources Research, Journal of Theoretical Biology and Agricultural Systems.

In The Last Decade

J.R. O’Callaghan

33 papers receiving 561 citations

Peers

J.R. O’Callaghan

CSE

G.S.V. Raghavan Canada

N. N. Mohsenin United States

W. K. Bilański Canada

G. M. Hyde United States

A. Deği̇rmenci̇oğlu Türkiye

Michael D. Montross United States

Maciej Bańda Poland

Bryan R. Becker United States

Feizollah Shahbazi Iran

Marvin J. Pitts United States

G.S.V. Raghavan Canada

J.R. O’Callaghan

294 ×1.1

67 ×0.3

264 ×1.7

83 ×0.5

CSE

76 ×1.0

Citations per year, relative to J.R. O’Callaghan J.R. O’Callaghan (= 1×) peers G.S.V. Raghavan

Countries citing papers authored by J.R. O’Callaghan

Since Specialization

Citations

This map shows the geographic impact of J.R. O’Callaghan's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by J.R. O’Callaghan with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites J.R. O’Callaghan more than expected).

Fields of papers citing papers by J.R. O’Callaghan

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by J.R. O’Callaghan. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by J.R. O’Callaghan. The network helps show where J.R. O’Callaghan may publish in the future.

Co-authorship network of co-authors of J.R. O’Callaghan

This figure shows the co-authorship network connecting the top 25 collaborators of J.R. O’Callaghan. A scholar is included among the top collaborators of J.R. O’Callaghan based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with J.R. O’Callaghan. J.R. O’Callaghan is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

O’Callaghan, J.R.. (1999). Peaches and Other Gifts. Home Healthcare Nurse. 17(7). 421–422. 1 indexed citations

O’Callaghan, J.R., et al.. (1997). A Simulation Modelling Approach to the Management of Spray Treatments of Fungal Attacks on Wheat. Journal of Agricultural Engineering Research. 66(4). 287–293. 3 indexed citations

Zhong, Z. & J.R. O’Callaghan. (1992). A theoretical analysis of the extrusion pressure in a tapered screw conveyor. Journal of Agricultural Engineering Research. 52. 249–271. 3 indexed citations

O’Callaghan, J.R., et al.. (1991). Separation of grain from straw in a vertical air stream. Journal of Agricultural Engineering Research. 48. 111–122. 16 indexed citations

Zhong, Z. & J.R. O’Callaghan. (1990). The effect of the shape of the feed opening on the performance of a horizontal screw conveyor. Journal of Agricultural Engineering Research. 46. 125–128. 7 indexed citations

O’Callaghan, J.R., et al.. (1986). The rôles and values of straw and nutritionally improved straw in ruminant rations. Agricultural Systems. 21(3). 215–225. 1 indexed citations

Woods, J.L., et al.. (1981). Thermophilic aerobic treatment of pig slurry. Journal of Agricultural Engineering Research. 26(6). 455–466. 24 indexed citations

Woods, J.L., et al.. (1980). Survival of Salmonella dublin in Pig Slurry During Aerobic Thermophilic Treatment in Batch, Cyclic and Continuous Systems. Journal of Applied Bacteriology. 49(1). 13–18. 10 indexed citations

Bhat, K. K. S., T. H. Flowers, & J.R. O’Callaghan. (1980). A model for the simulation of the fate of nitrogen in farm wastes on land application. The Journal of Agricultural Science. 94(1). 183–193. 16 indexed citations

10.

Woods, J.L., et al.. (1980). Evaluation of thermophilically-treated pig slurry as a source of nutrients in pig diets. Agriculture and Environment. 5(3). 227–239. 1 indexed citations

11.

O’Callaghan, J.R., et al.. (1980). Modeling soil water changes in a well‐structured, freely draining soil. Water Resources Research. 16(4). 755–761. 3 indexed citations

12.

O’Callaghan, J.R., et al.. (1978). Effect of interflow on soil drainage. Journal of Agricultural Engineering Research. 23(4). 397–415. 2 indexed citations

13.

O’Callaghan, J.R., et al.. (1978). Non-steady drainage in a layered soil. Journal of Agricultural Engineering Research. 23(4). 417–427. 4 indexed citations

14.

Woods, J.L., et al.. (1977). Thermophilic Fermentation of Pig Faeces and Straw by Actinomycetes. Journal of Applied Bacteriology. 43(2). 231–238. 6 indexed citations

15.

Woods, J.L. & J.R. O’Callaghan. (1974). Mathematical modelling of animal waste treatment. Journal of Agricultural Engineering Research. 19(3). 245–258. 6 indexed citations

16.

O’Callaghan, J.R., et al.. (1971). Characterization of waste treatment properties of pig manure. Journal of Agricultural Engineering Research. 16(4). 399–IN3. 21 indexed citations

17.

O’Callaghan, J.R., et al.. (1970). The interaction of components on the vacuum stability milking machines. Journal of Agricultural Engineering Research. 15(4). 331–346.

18.

O’Callaghan, J.R., et al.. (1966). A field test of drain spacing equations for agricultural land. Journal of Agricultural Engineering Research. 11(4). 282–295. 6 indexed citations

19.

O’Callaghan, J.R., et al.. (1965). Cleavage of soil by inclined and wedge-shaped tines. Journal of Agricultural Engineering Research. 10(3). 248–254. 7 indexed citations

20.

O’Callaghan, J.R., et al.. (1965). The handling of soil by mouldboard ploughs. Journal of Agricultural Engineering Research. 10(1). 23–35. 21 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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