Sprache: Englisch
Verlag: LAP LAMBERT Academic Publishing, 2021
ISBN 10: 6203461865 ISBN 13: 9786203461862
Anbieter: Books Puddle, New York, NY, USA
Zustand: New.
Sprache: Spanisch
Verlag: Ediciones Nuestro Conocimiento, 2021
ISBN 10: 6204311379 ISBN 13: 9786204311371
Anbieter: moluna, Greven, Deutschland
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In den WarenkorbZustand: New.
Sprache: Englisch
Verlag: LAP LAMBERT Academic Publishing, 2021
ISBN 10: 6203461865 ISBN 13: 9786203461862
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In den Warenkorbpaperback. Zustand: New. NEW. SHIPS FROM MULTIPLE LOCATIONS. book.
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Sprache: Spanisch
Verlag: Ediciones Nuestro Conocimiento, 2021
ISBN 10: 6204311379 ISBN 13: 9786204311371
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In den Warenkorbpaperback. Zustand: New. NEW. SHIPS FROM MULTIPLE LOCATIONS. book.
Anbieter: preigu, Osnabrück, Deutschland
Taschenbuch. Zustand: Neu. SYSTÈME DE POMPAGE PAR ROUE HYDRAULIQUE | ALIMENTÉ PAR L'ÉNERGIE CINÉTIQUE DE L'EAU | Er. Fanesh Kumar (u. a.) | Taschenbuch | Französisch | 2021 | Editions Notre Savoir | EAN 9786204311388 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu.
Anbieter: Mispah books, Redhill, SURRE, Vereinigtes Königreich
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Taschenbuch. Zustand: Neu. NASOSNAYa SISTEMA S VODYaNYM KOLESOM | PRIVODITSYa V DEJSTVIE KINETIChESKOJ JeNERGIEJ VODY | Fanesh Kumar (u. a.) | Taschenbuch | Russisch | 2021 | Sciencia Scripts | EAN 9786204311425 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu.
Sprache: Portugiesisch
Verlag: Edicoes Nosso Conhecimento, 2021
ISBN 10: 6204311417 ISBN 13: 9786204311418
Anbieter: moluna, Greven, Deutschland
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In den WarenkorbZustand: New.
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In den WarenkorbZustand: New.
Sprache: Portugiesisch
Verlag: Edições Nosso Conhecimento, 2021
ISBN 10: 6204311417 ISBN 13: 9786204311418
Anbieter: preigu, Osnabrück, Deutschland
Taschenbuch. Zustand: Neu. SISTEMA DE BOMBEAMENTO DE RODA D'ÁGUA | ALIMENTADO PELA ENERGIA CINÉTICA DA ÁGUA | Er. Fanesh Kumar (u. a.) | Taschenbuch | Portugiesisch | 2021 | Edições Nosso Conhecimento | EAN 9786204311418 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu.
Anbieter: preigu, Osnabrück, Deutschland
Taschenbuch. Zustand: Neu. SISTEMA DI POMPAGGIO A RUOTA D'ACQUA | ALIMENTATO DALL'ENERGIA CINETICA DELL'ACQUA | Er. Fanesh Kumar (u. a.) | Taschenbuch | Italienisch | 2021 | Edizioni Sapienza | EAN 9786204311395 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu.
Anbieter: preigu, Osnabrück, Deutschland
Taschenbuch. Zustand: Neu. WASSERRADPUMPANLAGE | ANGETRIEBEN DURCH DIE KINETISCHE ENERGIE DES WASSERS | Er. Fanesh Kumar (u. a.) | Taschenbuch | 96 S. | Deutsch | 2021 | Verlag Unser Wissen | EAN 9786204311364 | Verantwortliche Person für die EU: BoD - Books on Demand, In de Tarpen 42, 22848 Norderstedt, info[at]bod[dot]de | Anbieter: preigu.
Anbieter: Mispah books, Redhill, SURRE, Vereinigtes Königreich
EUR 168,86
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In den Warenkorbpaperback. Zustand: New. NEW. SHIPS FROM MULTIPLE LOCATIONS. book.
Verlag: Sciencia Scripts Nov 2021, 2021
ISBN 10: 6204311425 ISBN 13: 9786204311425
Anbieter: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, Deutschland
Taschenbuch. Zustand: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Pod#em i perenos wody dlq orosheniq bez älektrichestwa qwlqetsq slozhnoj zadachej. Pod#em i perenos wody k blizlezhaschemu prudu/otkrytomu kolodcu trebuet änergii. V dannom issledowanii byla predprinqta popytka reshit' ätu zadachu za schet kineticheskoj änergii tekuschej wody. Jeta nasosnaq sistema s wraschaüschimsq wodqnym kolesom qwlqetsq äkologicheski chistoj, i perekachka wody rabotaet na mehanicheskoj änergii bez älektrichestwa. Kineticheskaq änergiq tekuschej wody mozhet byt' ispol'zowana dlq takoj poleznoj raboty, kak perekachka wody. Jenergiq, proizwodimaq tekuschej wodoj, mozhet byt' ispol'zowana dlq pod#ema i perenosa wody dlq razlichnyh celej, takih kak oroshenie, a takzhe dlq drugih sel'skih rabot w otdalennyh rajonah. Nasosnaq sistema chashechnogo tipa byla ispytana pri razlichnyh naporah wsasywaniq i nagnetaniq. Pri postoqnnom napore wsasywaniq (0,56 m) i izmenenii napora podachi ot 0,70 m do 1,30 m bylo widno, chto napor ot 0,364 do 0,178 l/s umen'shaetsq po mere uwelicheniq napora.Spiral'naq trubchataq nasosnaq sistema pokazala opredelennye ogranicheniq w äffektiwnoj rabote. Pri glubine wody ot 0,30 m do 0,46 m bylo widno, chto napor ot 0,114 do 0,193 l/s uwelichiwaetsq po mere uwelicheniq glubiny wody. 96 pp. Russisch.
Sprache: Englisch
Verlag: LAP LAMBERT Academic Publishing Feb 2021, 2021
ISBN 10: 6203410519 ISBN 13: 9786203410518
Anbieter: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, Deutschland
Taschenbuch. Zustand: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Lifting and carrying water for irrigation without electricity is a challenge. Lifting and carrying water to nearby pond/open well requires energy. In this study an attempt has been made if this can be met out from the kinetic energy of flowing water. This revolving of water wheel pumping system is eco- friendly and water pumping works on mechanical energy without electricity. The kinetic energy of flowing water can be utilized for some use full work like pumping. The energy produced by flowing water can be utilized for lifting and carrying water for different purposes such as irrigation and also for other rural works in remote areas. The cup type pumping system was tested at different suction heads and delivery heads. When the suction head (0.56 m) is constant and the delivery head is varying from 0.70 m to 1.30 m. It was seen that the discharge varying from 0.364 to 0.178 lps is decreasing as the discharge head increasing.Spiral tube pumping system has shown certain constraints in the effective performance of the operation. When the water depth varies from 0.30 m to 0.46 m, it was seen that the discharge varying from 0.114 to 0.193 lps is increasing as water depth to increasing. 100 pp. Englisch.
Sprache: Englisch
Verlag: LAP LAMBERT Academic Publishing Feb 2021, 2021
ISBN 10: 6203461865 ISBN 13: 9786203461862
Anbieter: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, Deutschland
Taschenbuch. Zustand: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Lifting and carrying water for irrigation without electricity is a challenge. Lifting and carrying water to nearby pond/open well requires energy. In this study an attempt has been made if this can be met out from the kinetic energy of flowing water. This revolving of water wheel pumping system is eco- friendly and water pumping works on mechanical energy without electricity. The kinetic energy of flowing water can be utilized for some use full work like pumping. The energy produced by flowing water can be utilized for lifting and carrying water for different purposes such as irrigation and also for other rural works in remote areas. The cup type pumping system was operated by flowing water and convert kinetic energy to mechanical energy. The power from the wheel is transferred to the pulley of pump. It is operating the centrifugal pump. It is very good for carrying water from minor canals to some horizontal distances nearby field. Similarly, Spiral tube pumping system has also been developed. The water wheel revolves, when water passing around it. At every revolution water inlet dip into water and takes water into tube. 104 pp. Englisch.
Sprache: Englisch
Verlag: LAP LAMBERT Academic Publishing, 2021
ISBN 10: 6203461865 ISBN 13: 9786203461862
Anbieter: Majestic Books, Hounslow, Vereinigtes Königreich
EUR 85,03
Anzahl: 4 verfügbar
In den WarenkorbZustand: New. Print on Demand.
Sprache: Englisch
Verlag: LAP LAMBERT Academic Publishing, 2021
ISBN 10: 6203461865 ISBN 13: 9786203461862
Anbieter: moluna, Greven, Deutschland
EUR 45,45
Anzahl: Mehr als 20 verfügbar
In den WarenkorbZustand: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Kumar FaneshFanesh Kumar completed B.Tech. Agricultural Engineering, M.Tech. Soil & Water Engineering and PhD. Soil & water Engineering, Indira Gandhi Krishi Vishwavidyalaya, Raipur (C.G), India. One year experience as Assistant Prof.
Sprache: Englisch
Verlag: LAP LAMBERT Academic Publishing, 2021
ISBN 10: 6203410519 ISBN 13: 9786203410518
Anbieter: moluna, Greven, Deutschland
EUR 45,45
Anzahl: Mehr als 20 verfügbar
In den WarenkorbZustand: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Kumar Er. FaneshI am Fanesh Kumar completed B.Tech Agricultural Engineering, M.Tech Soil & water Engineering and now studying PhD Soil & Water Engineering. One year experience work as an Assistance Professor (Guest teacher). Which.
Sprache: Englisch
Verlag: LAP LAMBERT Academic Publishing, 2021
ISBN 10: 6203461865 ISBN 13: 9786203461862
Anbieter: Biblios, Frankfurt am main, HESSE, Deutschland
Zustand: New. PRINT ON DEMAND.
Sprache: Spanisch
Verlag: Ediciones Nuestro Conocimiento Nov 2021, 2021
ISBN 10: 6204311379 ISBN 13: 9786204311371
Anbieter: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, Deutschland
Taschenbuch. Zustand: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Levantar y transportar agua para el riego sin electricidad es un reto. Para elevar y transportar el agua a un estanque o pozo cercano se necesita energía. En este estudio se ha intentado averiguar si se puede conseguir a partir de la energía cinética del agua que fluye. Este sistema de bombeo de rueda de agua es ecológico y el bombeo de agua funciona con energía mecánica sin electricidad. La energía cinética del agua que fluye puede ser utilizada para algún trabajo completo como el bombeo. La energía producida por el agua que fluye puede ser utilizada para elevar y transportar agua para diferentes propósitos como la irrigación y también para otros trabajos rurales en áreas remotas. El sistema de bombeo tipo copa se probó con diferentes alturas de aspiración y de impulsión. Cuando la altura de succión (0,56 m) es constante y la altura de impulsión varía de 0,70 m a 1,30 m, se observa que la descarga varía de 0,364 a 0,178 lps y disminuye a medida que aumenta la altura de descarga.El sistema de bombeo de tubo en espiral ha mostrado ciertas limitaciones en el rendimiento efectivo de la operación. Cuando la profundidad del agua varía de 0,30 m a 0,46 m, se observa que la descarga varía de 0,114 a 0,193 lps a medida que aumenta la profundidad del agua. 96 pp. Spanisch.
Sprache: Englisch
Verlag: LAP LAMBERT Academic Publishing Feb 2021, 2021
ISBN 10: 6203410519 ISBN 13: 9786203410518
Anbieter: buchversandmimpf2000, Emtmannsberg, BAYE, Deutschland
Taschenbuch. Zustand: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Lifting and carrying water for irrigation without electricity is a challenge. Lifting and carrying water to nearby pond/open well requires energy. In this study an attempt has been made if this can be met out from the kinetic energy of flowing water. This revolving of water wheel pumping system is eco- friendly and water pumping works on mechanical energy without electricity. The kinetic energy of flowing water can be utilized for some use full work like pumping. The energy produced by flowing water can be utilized for lifting and carrying water for different purposes such as irrigation and also for other rural works in remote areas. The cup type pumping system was tested at different suction heads and delivery heads. When the suction head (0.56 m) is constant and the delivery head is varying from 0.70 m to 1.30 m. It was seen that the discharge varying from 0.364 to 0.178 lps is decreasing as the discharge head increasing.Spiral tube pumping system has shown certain constraints in the effective performance of the operation. When the water depth varies from 0.30 m to 0.46 m, it was seen that the discharge varying from 0.114 to 0.193 lps is increasing as water depth to increasing.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 100 pp. Englisch.
Sprache: Englisch
Verlag: LAP LAMBERT Academic Publishing Feb 2021, 2021
ISBN 10: 6203461865 ISBN 13: 9786203461862
Anbieter: buchversandmimpf2000, Emtmannsberg, BAYE, Deutschland
Taschenbuch. Zustand: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Lifting and carrying water for irrigation without electricity is a challenge. Lifting and carrying water to nearby pond/open well requires energy. In this study an attempt has been made if this can be met out from the kinetic energy of flowing water. This revolving of water wheel pumping system is eco- friendly and water pumping works on mechanical energy without electricity. The kinetic energy of flowing water can be utilized for some use full work like pumping. The energy produced by flowing water can be utilized for lifting and carrying water for different purposes such as irrigation and also for other rural works in remote areas. The cup type pumping system was operated by flowing water and convert kinetic energy to mechanical energy. The power from the wheel is transferred to the pulley of pump. It is operating the centrifugal pump. It is very good for carrying water from minor canals to some horizontal distances nearby field. Similarly, Spiral tube pumping system has also been developed. The water wheel revolves, when water passing around it. At every revolution water inlet dip into water and takes water into tube.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 104 pp. Englisch.
Sprache: Englisch
Verlag: LAP LAMBERT Academic Publishing, 2021
ISBN 10: 6203410519 ISBN 13: 9786203410518
Anbieter: AHA-BUCH GmbH, Einbeck, Deutschland
Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Lifting and carrying water for irrigation without electricity is a challenge. Lifting and carrying water to nearby pond/open well requires energy. In this study an attempt has been made if this can be met out from the kinetic energy of flowing water. This revolving of water wheel pumping system is eco- friendly and water pumping works on mechanical energy without electricity. The kinetic energy of flowing water can be utilized for some use full work like pumping. The energy produced by flowing water can be utilized for lifting and carrying water for different purposes such as irrigation and also for other rural works in remote areas. The cup type pumping system was tested at different suction heads and delivery heads. When the suction head (0.56 m) is constant and the delivery head is varying from 0.70 m to 1.30 m. It was seen that the discharge varying from 0.364 to 0.178 lps is decreasing as the discharge head increasing.Spiral tube pumping system has shown certain constraints in the effective performance of the operation. When the water depth varies from 0.30 m to 0.46 m, it was seen that the discharge varying from 0.114 to 0.193 lps is increasing as water depth to increasing.
Sprache: Englisch
Verlag: LAP LAMBERT Academic Publishing, 2021
ISBN 10: 6203461865 ISBN 13: 9786203461862
Anbieter: AHA-BUCH GmbH, Einbeck, Deutschland
Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Lifting and carrying water for irrigation without electricity is a challenge. Lifting and carrying water to nearby pond/open well requires energy. In this study an attempt has been made if this can be met out from the kinetic energy of flowing water. This revolving of water wheel pumping system is eco- friendly and water pumping works on mechanical energy without electricity. The kinetic energy of flowing water can be utilized for some use full work like pumping. The energy produced by flowing water can be utilized for lifting and carrying water for different purposes such as irrigation and also for other rural works in remote areas. The cup type pumping system was operated by flowing water and convert kinetic energy to mechanical energy. The power from the wheel is transferred to the pulley of pump. It is operating the centrifugal pump. It is very good for carrying water from minor canals to some horizontal distances nearby field. Similarly, Spiral tube pumping system has also been developed. The water wheel revolves, when water passing around it. At every revolution water inlet dip into water and takes water into tube.
Sprache: Französisch
Verlag: Editions Notre Savoir Nov 2021, 2021
ISBN 10: 6204311387 ISBN 13: 9786204311388
Anbieter: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, Deutschland
Taschenbuch. Zustand: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Lever et transporter l'eau pour l'irrigation sans électricité est un défi. L'élévation et le transport de l'eau vers un étang ou un puits ouvert à proximité nécessitent de l'énergie. Dans cette étude, une tentative a été faite pour savoir si cela peut être réalisé à partir de l'énergie cinétique de l'eau qui coule. Ce système de pompage par roue à eau tournante est écologique et le pompage de l'eau fonctionne grâce à l'énergie mécanique sans électricité. L'énergie cinétique de l'eau qui coule peut être utilisée pour un travail complet comme le pompage. L'énergie produite par l'eau qui s'écoule peut être utilisée pour soulever et transporter l'eau à différentes fins, telles que l'irrigation et d'autres travaux ruraux dans les régions éloignées. Le système de pompage à godets a été testé à différentes hauteurs d'aspiration et de refoulement. Lorsque la hauteur d'aspiration (0,56 m) est constante et que la hauteur de refoulement varie de 0,70 m à 1,30 m, on constate que le débit, qui varie de 0,364 à 0,178 lps, diminue lorsque la hauteur de refoulement augmente.Le système de pompage à tube spiralé a montré certaines contraintes dans la performance efficace de l'opération. Lorsque la profondeur d'eau varie de 0,30 m à 0,46 m, il a été constaté que le débit variant de 0,114 à 0,193 lps augmente avec la profondeur d'eau. 96 pp. Französisch.
Sprache: Spanisch
Verlag: Ediciones Nuestro Conocimiento Nov 2021, 2021
ISBN 10: 6204311379 ISBN 13: 9786204311371
Anbieter: buchversandmimpf2000, Emtmannsberg, BAYE, Deutschland
Taschenbuch. Zustand: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Levantar y transportar agua para el riego sin electricidad es un reto. Para elevar y transportar el agua a un estanque o pozo cercano se necesita energía. En este estudio se ha intentado averiguar si se puede conseguir a partir de la energía cinética del agua que fluye. Este sistema de bombeo de rueda de agua es ecológico y el bombeo de agua funciona con energía mecánica sin electricidad. La energía cinética del agua que fluye puede ser utilizada para algún trabajo completo como el bombeo. La energía producida por el agua que fluye puede ser utilizada para elevar y transportar agua para diferentes propósitos como la irrigación y también para otros trabajos rurales en áreas remotas. El sistema de bombeo tipo copa se probó con diferentes alturas de aspiración y de impulsión. Cuando la altura de succión (0,56 m) es constante y la altura de impulsión varía de 0,70 m a 1,30 m, se observa que la descarga varía de 0,364 a 0,178 lps y disminuye a medida que aumenta la altura de descarga.El sistema de bombeo de tubo en espiral ha mostrado ciertas limitaciones en el rendimiento efectivo de la operación. Cuando la profundidad del agua varía de 0,30 m a 0,46 m, se observa que la descarga varía de 0,114 a 0,193 lps a medida que aumenta la profundidad del agua.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 96 pp. Spanisch.
Sprache: Spanisch
Verlag: Ediciones Nuestro Conocimiento, 2021
ISBN 10: 6204311379 ISBN 13: 9786204311371
Anbieter: AHA-BUCH GmbH, Einbeck, Deutschland
Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Levantar y transportar agua para el riego sin electricidad es un reto. Para elevar y transportar el agua a un estanque o pozo cercano se necesita energía. En este estudio se ha intentado averiguar si se puede conseguir a partir de la energía cinética del agua que fluye. Este sistema de bombeo de rueda de agua es ecológico y el bombeo de agua funciona con energía mecánica sin electricidad. La energía cinética del agua que fluye puede ser utilizada para algún trabajo completo como el bombeo. La energía producida por el agua que fluye puede ser utilizada para elevar y transportar agua para diferentes propósitos como la irrigación y también para otros trabajos rurales en áreas remotas. El sistema de bombeo tipo copa se probó con diferentes alturas de aspiración y de impulsión. Cuando la altura de succión (0,56 m) es constante y la altura de impulsión varía de 0,70 m a 1,30 m, se observa que la descarga varía de 0,364 a 0,178 lps y disminuye a medida que aumenta la altura de descarga.El sistema de bombeo de tubo en espiral ha mostrado ciertas limitaciones en el rendimiento efectivo de la operación. Cuando la profundidad del agua varía de 0,30 m a 0,46 m, se observa que la descarga varía de 0,114 a 0,193 lps a medida que aumenta la profundidad del agua.
Verlag: Sciencia Scripts Nov 2021, 2021
ISBN 10: 6204311425 ISBN 13: 9786204311425
Anbieter: buchversandmimpf2000, Emtmannsberg, BAYE, Deutschland
Taschenbuch. Zustand: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Pod#em i perenos wody dlq orosheniq bez älektrichestwa qwlqetsq slozhnoj zadachej. Pod#em i perenos wody k blizlezhaschemu prudu/otkrytomu kolodcu trebuet änergii. V dannom issledowanii byla predprinqta popytka reshit' ätu zadachu za schet kineticheskoj änergii tekuschej wody. Jeta nasosnaq sistema s wraschaüschimsq wodqnym kolesom qwlqetsq äkologicheski chistoj, i perekachka wody rabotaet na mehanicheskoj änergii bez älektrichestwa. Kineticheskaq änergiq tekuschej wody mozhet byt' ispol'zowana dlq takoj poleznoj raboty, kak perekachka wody. Jenergiq, proizwodimaq tekuschej wodoj, mozhet byt' ispol'zowana dlq pod#ema i perenosa wody dlq razlichnyh celej, takih kak oroshenie, a takzhe dlq drugih sel'skih rabot w otdalennyh rajonah. Nasosnaq sistema chashechnogo tipa byla ispytana pri razlichnyh naporah wsasywaniq i nagnetaniq. Pri postoqnnom napore wsasywaniq (0,56 m) i izmenenii napora podachi ot 0,70 m do 1,30 m bylo widno, chto napor ot 0,364 do 0,178 l/s umen'shaetsq po mere uwelicheniq napora.Spiral'naq trubchataq nasosnaq sistema pokazala opredelennye ogranicheniq w äffektiwnoj rabote. Pri glubine wody ot 0,30 m do 0,46 m bylo widno, chto napor ot 0,114 do 0,193 l/s uwelichiwaetsq po mere uwelicheniq glubiny wody.Books on Demand GmbH, Überseering 33, 22297 Hamburg 96 pp. Russisch.