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The efficient use of human energy for micro-scale irrigation


, : The efficient use of human energy for micro-scale irrigation. Journal of agricultural engineering research 48(3): 171-183

The potential for improving the efficiency of micro-scale irrigation in Africa through the use of simple human powered pumps is discussed. In a series of tests carried out in Harare, Zimbabwe the sustainable performances of three hand-operated pumps, the rope-washer, the Rower and the Bumi and one foot-operated pump, the treadle, were evaluated. Human power output was calibrated against heart rate for two subjects. This calibration, in conjunction with heart rate monitoring during pump operation was used to assess pump efficiencies in enabling human energy and effort to raise water for irrigation. The rope-washer pump, which is the cheapest and easiest to make of the pumps tested, performed surprisingly well at all pumping heads, producing similar outputs to that of the treadle pump. The Bumi pump gave good flow rates but only at low heads while the Rower pump gave the lowest outputs over a restricted range of pumping heads. The results demonstrate the importance of designing for foot rather than hand operation in order to achieve the best efficiency of utilization of human effort and indicates that sustainable pump power outputs in excess of 40 W are possible with the pumps tested. A strong preference for a narrow operating speed range, 30 to 50 rev/min, was confirmed for both hand and foot operation.

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Accession: 002249771

DOI: 10.1016/0021-8634(91)80013-5

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Schneiderman, E.D.; Kowalski, C.J.; Ten-Have, T.R.; Willis, S.M., 1992: Computation of foulkes and davis' nonparametric tracking index using gauss. Foulkes and Davis (1981) define tracking as the maintenance of relative rank over a given time span. This paper outlines the development of their statistic, based on a set of individual growth profiles, which estimates the degree of tracking obser...

Haas, S., 1999: Medical principles of thromboembolism prevention. Since thromboembolic complications have been described to be one of the most frequent complications following surgery, a correct indication for prophylaxis is of great clinical importance. This requires comprehensive knowledge about the general th...

Cigolini M.; Cinti S.; Brunetti L.; Bosello O.; Osculati F.; Bjorntorp P., 1985: Human brown adipose cells in culture. Brown adipose tissue (BAT), obtained from the axillary and perirenal regions of newborns 24-48 h after death, was digested with collagenase and the free cells were cultured. Only the cultures of cells from tissue obtained later than 24 h post mort...

Messori, A.; Fadda, V.; Maratea, D.; Trippoli, S., 2015: Comparing benefits expected in the design of randomized trials with the results of mature meta-analysis: an analysis on aspiration thrombectomy in acute myocardial infarction. International Journal of Cardiology 176(3): 1417-1419

Salmon S.E., 1985: In vitro observations in clonogenic assay and potential extrapolations to adjuvant therapy of cancer. Jones, S E And S E Salmon (Ed ) Adjuvant Therapy Of Cancer, Vol 4 Proceedings Of The 4th International Conference, Tucson, Ariz , Usa, Mar 21-24, 1984 Xv+699p Grune And Stratton, Inc : Orlando, Fla , Usa; London, England (Dist By Grune And Stratton, Ltd : London, England) Illus 17-26, 1984

Altiner, D.; Altiner, S.O.kan, 2010: Danielita gailloti n gen, n sp, within the evolutionary framework of Middle-Late Permian dagmaritins. The name Danielita is proposed for a new dagmaritin genus characterized by a biserial arrangement of chambers with spine-like extensions at chamber corners and a perforated wall. Danielita differs from Dagmarita, from which it was derived, by a pe...

Koenig, H., 1959: The phospholipid nature of the neurokeratin network of myelin. After the histological processes of formalin fixation, infiltration and embedding, the staining for myelin is actually a staining of the neurokeratin network. Even when myelin lipids are not removed prior to staining the neurokeratin is still stai...

Model, A.; Spicer, F.; Ryle, A., 1968: Discussion on adolescents. Practitioner 200(196): 296-298

Heidenreich, R.; Jasny, E.; Kowalczyk, A.; Lutz, J.; Probst, J.; Baumhof, P.; Scheel, B.; Voss, Söhnke.; Kallen, K-Josef.; Fotin-Mleczek, M., 2015: A novel RNA-based adjuvant combines strong immunostimulatory capacities with a favorable safety profile. Protein- and peptide-based tumor vaccines depend on strong adjuvants to induce potent immune responses. Here, we demonstrated that a recently developed novel adjuvant based on a non-coding, long-chain RNA molecule, termed RNAdjuvant(®) , profound...

Liaw G J.; Chang G M., 1989: Relative resistance of the silkworm bombyx mori strains to nuclear polyhedrosis virus. Fourteen Chinese, 16 Japanese and 6 tropical strains of the silkworm, Bombyx mori L., in Taiwan were inoculated with nuclear polyhedrosis virus (NPV) on mulberry leaves to determine their relative resistance to this virus. Yinko of Japanese strain...