“The S.S. Lulworth Hill, a freighter bound home for England...was torpedoed by a German submarine on March 19, 1943, off the west coast of central Africa. The ship’s first officer and 13 crewmen reached life rafts. Fifty days later, when a British destroyer steamed into view, two men still lived. One survivor died shortly after the rescue. The remaining man, who was the ship’s carpenter, tells the story. Kenneth Cooke, ends his preface with a line that might have been written by Conrad: “And there is no one left now to tell me I have remembered badly.” It is the musing of a man who sat helpless while sharks ate the bodies of twelve raftmates, and who calculated the dwindling strength of those left alive, as they openly calculated his, in the hope of gaining extra rations. After 17 years, the inexplicable and awesome fact of his survival still obsesses Cooke. No one who reads his book will need to ask why. After the 14 men reached their raft, the first officer calculated the food supply to last for 30 days...What follows is a catalogue of torments. Tongues swelled and turned black. Sea water and the equatorial sun cut running sores. The feet of a wounded man turned gangrenous. By the 19th day, Cooke, who kept the log, recorded the first death. The body was rolled into the sea; cannibalism was a temptation. Now and then a flying fish landed in the raft, and Cooke speared a few other fish with a homemade harpoon. Once it rained briefly, and the men greedily licked moisture from the raft’s canvas. Otherwise there was no relief. More men died. The strongest man on the raft went mad, locked two other men in his arms and jumped to the sharks. Cooke, crazed by the groans of a man whose ribs were broken, kicked the fellow to quiet him. To the author, the book is a riddle: How was he alone able to survive?...The only conclusion is that some men, for some reason, cling hard to life, and that the sea, as Cooke wrote truthfully, does not care.”-Time.
Man on a Raft also entitled What Cares the Sea? and first published in 1960, is a gripping true account of survival (and death) at sea. Following the 1943 sinking of the merchant ship S.S. Lulworth Hill in the south Atlantic by Italian submarine Leonardo da Vinci., 14 men, including the author, gather on a small liferaft. The men attempt to reach the African coast, but intense sun, starvation, sharks, injuries and madness begin to take their toll. When British warship HMS Rapid reaches the raft nearly two months later, only two men, author Kenneth Cooke and crewmate Colin Armitage, remain alive. This heart-breaking story remains inspirational due to the author's faith, determination, and compassion for his fellow raftmates. Included are six pages of illustrations.
Infectious diseases are transmitted through various different mechanisms including person to person interactions, by insect vectors and via vertical transmission from a parent to an unborn offspring. The population dynamics of such disease transmission can be very complicated and the development of rational strategies for controlling and preventing the spread of these diseases requires careful modeling and analysis. The book describes current methods for formulating models and analyzing the dynamics of the propagation of diseases which include vertical transmission as one of the mechanisms for their spread. Generic models that describe broad classes of diseases as well as models that are tailored to the dynamics of a specific infection are formulated and analyzed. The effects of incubation periods, maturation delays, and age-structure, interactions between disease transmission and demographic changes, population crowding, spatial spread, chaotic dynamic behavior, seasonal periodicities and discrete time interval events are studied within the context of specific disease transmission models. No previous background in disease transmission modeling and analysis is assumedand the required biological concepts and mathematical methods are gradually introduced within the context of specific disease transmission models. Graphs are widely used to illustrate and explain the modeling assumptions and results. REMARKS: NOTE: the authors have supplied variants on the promotion text that are more suitable for promotionin different fields (by virtue of different emphasis in the content). They are not enclosed, but in the mathematics editorial.
Designed to introduce students to the theory and applications of differential equations and to help them formulate scientific problems in terms of such equations, this undergraduate-level text emphasizes applications to problems in biology, economics, engineering, and physics. This edition also includes material on discontinuous solutions, Riccati and Euler equations, and linear difference equations.
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