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Search Results: 1 - 10 of 1321 matches for " Harvey; "
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Analysis of Global Warming Using Machine Learning  [PDF]
Harvey Zheng
Computational Water, Energy, and Environmental Engineering (CWEEE) , 2018, DOI: 10.4236/cweee.2018.73009
Abstract: Climate change is a controversial topic of debate, especially in the US, where many do not believe in anthropogenic climate change. Because its consequences are predicted to be dire, such as a mass ocean extinction and frequent extreme weather events, it is important to learn what causes the warming in order to better combat it. In this study, the first challenge dwells on how to construct reliable statistical models based on massive climate data of 800,000 years and accurately capture the relationship between temperature and potential factors such as concentrations of carbon dioxide (CO2), nitrous oxide (N2O), and methane (CH4). We compared the performance several mainstream machine learning algorithms on our data, which includes linear regression, lasso, support vector regression and random forest, to build the state of the art model to verify the warming of the earth and identifying factors contributing the global warming. We found that random forest outperforms other algorithms to create accurate climate models which use features including concentrations of different greenhouse gases to precisely forecast global atmosphere. The other challenges in identifying factor importance can be met by the feature of ensemble tree-based random forest algorithm. It was found that CO2 is the largest contributor to temperature change, followed by CH4, then by N2O. They all had some sorts of impact, though, meaning their release into the atmosphere should all be controlled to help restrain temperature increase, and help prevent climate change’s potential ramifications.
The City-Level Effects of Offshoring  [PDF]
Perry Burnett, Harvey Cutler
Modern Economy (ME) , 2014, DOI: 10.4236/me.2014.510094
Abstract: This paper uses a city-level computable general equilibrium (CGE) model to examine the impacts of offshoring for three different periods in the US economy for cities that did not lose jobs to firms relocating overseas. We examine offshoring of final retail and merchandising goods in the 1950- 1980 period, manufactured goods (intermediate goods) in the 1970-2000 period, and current service sector and high-skilled jobs. The impacts of offshoring vary considerably over these time periods. Most notably, when offshoring occurs in high-skilled industries such as computer software and bioengineering, the contributions to economic growth will be smaller compared to the retail and manufacturing experiences over the last 60 years. The results also show wage and per household income effects.
Editors, Publishers, Impact Factors, and Reprint Income
Harvey Marcovitch
PLOS Medicine , 2010, DOI: 10.1371/journal.pmed.1000355
Abstract:
Little Fish Are Less Likely to Take the Bait
Harvey Marcovitch
PLOS Medicine , 2005, DOI: 10.1371/journal.pmed.0020221
Abstract:
Gene may regulate need for sleep
Harvey Black
Genome Biology , 2005, DOI: 10.1186/gb-spotlight-20050429-01
Abstract: Giulio Tononi and colleagues from the University of Wisconsin, Madison, examined 9000 mutant lines of Drosophila melanogaster to search for genes that might explain why some individuals manage fine on just a few hours sleep each night.Of 15 lines that slept at least two standard deviations less than the mean each day, the researchers chose the most extreme for further examination. In this line they found a threonine-isoleucine substitution in exon 9 of the Shaker gene, a region that is very well conserved in species ranging from Drosophila to humans.Sleep is a complex phenomenon affected by the environment and probably many genes, but some are evidently more powerful than others, coauthor Ciara Cirelli told The Scientist. "This is really the first gene that has been shown to have such a profound effect. These flies are only sleeping 3 or 4 hours instead of 10 or 12."Flies with this mutation have altered potassium channels, resulting in less hyperpolarization, or more excitability, Cirelli explained. "We feel that we are playing with a gene that is in the final common pathway of controlling sleeping because you are affecting the excitability of cell membranes."The paper is important, "simply because we really don't know that much about genes that are involved in sleep in model organisms," commented Leslie Griffith, a biologist at Brandies University not involved in this study. "It's hard to know how important this particular gene will be, but the fact that it's possible to pick out genes and do this kind of screen will really help us get at the mechanisms [of sleep].""What's cool about the way they've done it is they have one tiny change in the genome, and they know exactly what it does and they can show it in a lot of different flies," said Joan Hendricks of the University of Pennsylvania, who was not involved in the study.In examining other flies from existing stocks with the same mutation in Shaker, Tononi and colleagues ran into a surprise. "When we tested these
Misconduct by researchers and authors
Marcovitch,Harvey;
Gaceta Sanitaria , 2007, DOI: 10.1590/S0213-91112007000600011
Abstract: most scientific research is conducted properly and reported honestly but a few authors invent or manipulate data to reach fraudulent conclusions. other types of misconduct include deliberately providing incomplete or improperly processed data, failure to follow ethical procedures, failure to obtain informed consent, breach of patient confidentiality, improper award or denial of authorship, failure to declare competing interests, duplicate submission and plagiarism. editors, peer reviewers and publishers may also act wrongly. good practice guidelines are available from the international committee of medical journal editors (the vancouver group) and the council of science editors, amongst others. the committee on publication ethics provides flowcharts to assist editors deal with authorial misconduct. examples are provided of cases involving epidemiological or public health research, reported to cope over the last 9 years. suggestions are offered as to how misconduct might be handled in future.
Rorty the Reformer?
Cormier,Harvey;
Ideas y Valores , 2008,
Abstract: rorty should be read as a reformer, rather than a revolutionary transformer. while the reformer aims to improve what is already good, the revolutionary transformer seeks to dispense with the merely good in a quest for the absolutely best. for rorty this choice was a bad choice. in order to make the case that rorty was a reformer, we explicate rorty?s views on truth. these views argue that we can obtain consensus about what is worth preserving and improving without reference to either rightness, truth, or objectivity. for after all, there is no way for philosophers to get outside the circle of language within which we debate about what we take to be authoritative and aceptable.
LA LIBERTAD DE LA CIUDAD
Harvey,David;
Antipoda. Revista de Antropología y Arqueología , 2008,
Abstract: in this paper david harvey explores the existing relation between the problem of surplus capital allocation and the increasing transformations of urban space. the paper, written before the world economic crisis was declared, offers a spatial analysis which anticipates the crisis and examines the consequences that the current economic model will have for future urban life.
Organización para la transición anti-capitalista
Harvey, David;
Argumentos (México, D.F.) , 2010,
Abstract: harvey's article is structured around the following questions: can capitalism survive its current trauma? can the capitalist class reproduce its power in the name of countless serious economic, social, political, geopolitical and environmental difficulties? how will the capitalist class emerge from the current crisis and how soon will it end? can the world change materially, socially, mentally and politically, so that it can face not only the terrible state of natural and social relations, but also the endless perpetuation of compound growth? what are the spaces remaining in the global economy for new spatial arrangements to absorb surplus capital? can the left negotiate the dynamics of the crisis? another world is possible? another communism is possible?
A Tale of Two Hormones: Role of Leptin and Insulin in Hippocampal Synaptic Function
Jenni Harvey
The Open Neuroscience Journal , 2007, DOI: 10.2174/1874082000701010001]
Abstract: It is well documented that the endocrine hormones, leptin and insulin provide signals to specific hypothalamic brain regions to regulate energy balance. However, the past decade of research has not only revealed the widespread expression of insulin and leptin receptors in the CNS, but has also identified numerous additional functions of these hormones in the brain. In particular, there is growing evidence that these hormones markedly influence hippocampal excitatory synaptic transmission as well as hippocampal synaptic plasticity. More recent studies have also identified links between dysregulation of leptin and insulin systems and the development of neurodegenerative disorders such as Alzheimer s disease. Here we review the recent evidence supporting a role for these hormones in modulating hippocampal synaptic function in health and disease.
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