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Linear And Nonlinear Programming

http://jah.oxfordjournals.org/content/89/4/1625.full.pdf

Historical Thinking and Other Unnatural Acts: Charting the Future of Teaching the Past

The Past Is a Foreign Country

Analysis of measurements of absorbed radiation and leaf area indices of wheat and barley crops showed that throughout most of growth the fraction of absorbed solar radiation could be described by a simple exponential equation.For several of these crops grown under a wide range of weather and husbandry at Sutton Bonington and Rothamsted, 2-weekly values of crop growth rate (C) were closely related to radiation absorbed until ear emergence and about 3·0 g of dry matter (D.M.) were produced by each MJ of photosynthetically active radiation (PAR) absorbed. Final crop weight was closelyrelated to total PAR absorbed during growth (SA); on average about 2·2 g D.M. were produced per MJ absorbed, equivalent to a growth efficiency (Eg) of approximately 3·9%. Unfertilized and drought-stressed crops had a smaller Eg.The fraction of total crop D.M. harvested as grain (harvest index) varied more for wheat than for barley. Calculations of a maximum realizable grain yield made using the largest values of Eg and SA for the crops measured and assuming a harvestindex of 0.53 (achieved in an experimental crop) showed a grain D.M. yield of 10·3 t D.M./ha to be possible. To achieve such a yield would require full crop cover from the beginning of April until the end of July in a typical English growing season.

https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0021859600056616

Radiation absorption, growth and yield of cereals

The experience of grief is one of history’s most universal yet elusive themes, ever present even in peacetime but generated with almost intolerable intensity and frequency by wars. The practice of mourning, both public and private, provided essential consolation for those bereaved as a result of the Great War. Jay Winter admits that \"how healing occurs, and what quietens embitterment and alleviates despair can never be fully known\". Yet \"not to ask the question . . . is both to impoverish the study of history and to evade our responsibility as historians\" (116). If directed to every scholar individually, this injunction would indeed be outrageous – some of us must be allowed to indulge other interests in, say, laughter, labour, railways, sex, incunabula, or diplomacy. In fact, Winter is addressing historians of the Great War as if they were a team, an ideal rarely achieved in scholarship but to some extent realised in the conferences and collaborations associated with the Historial de la Grande Guerre at Péronne, which he helped establish. The collaborative approach suffuses this book, and the endnotes are strewn with warm and deserved acknowledgements of help from numerous colleagues. The effect is to suggest a series of lively and speculative seminars, complete with sometimes indistinct and half-explored images flashing onto the whiteboard from an overheated projector: the 31 illustrations are often dark and dim, in contrast to the splendidly sharp reproductions in Winter’s The Experience of World War I (1988). This is history in the making: inconclusive, uneven, but consistently exhilarating.

Sites of Memory, Sites of Mourning: the Great War in European Cultural History

Barley and its Environment. I. Theory and Practice

In recent decades there has been considerable i nternational research into the meanings, uses, and consumption of the past among various peoples around the world. These memory studies have been fuelled not only by the nationally oriented work of Pierre Nora and David Lowenthal, among others, but also by the exploration of commemoration, trauma, and genocide as sites of history. Holocaust, and then postcolonial, studies precipitated an expansive research interest that was less nationally bound and more defi ned by ethnicity and experience. Both of these closely related fi elds have seen a wealth of theoretical speculation, semiotic analysis, and investigation of representations of the past and of those who produce them. With that burgeoning fi eld of research also began the important interpretive work of interrogating and making meaning from history sites, such as monuments, textbooks, remembrances, and exhibitions. The result of such scholarly attention meant these markers in eff ect became “works” of history, as laden with meaning as any text, and demanded critique accordingly: memorial architecture was analyzed and interrogated, syllabuses and textbooks were rigorously combed, commemorations and museum exhibits were re-read from critical perspectives, family histories were interpreted with a scholarly lens. Building on the scholarship into these public historical iterations, feminist and postcolonial scholars also revealed the embodied power of the past, as memories of slavery, colonization, Indigenous histories, the Holocaust, and motherhood registered corporeally. Archaeologists and

K. Gregson

Papers

Barley and its Environment. I. Theory and Practice

I. theory and practice