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Search Results: 1 - 10 of 34816 matches for " John Levi Hilton III "
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A Preliminary Examination of the Cost Savings and Learning Impacts of Using Open Textbooks in Middle and High School Science Classes,John Levi Hilton III,Shelley Ellington and Tiffany Hall
International Review of Research in Open and Distance Learning , 2012,
Abstract: Proponents of open educational resources claim that significant cost savings are possible when open textbooks displace traditional textbooks in the classroom. Over a period of two years, we worked with 20 middle and high school science teachers (collectively teaching approximately 3,900 students) who adopted open textbooks to understand the process and determine the overall cost of such an adoption. The teachers deployed open textbooks in multiple ways. Some of these methods cost more than traditional textbooks; however, we did identify and implement a successful model of open textbook adoption that reduces costs by over 50% compared to the cost of adopting traditional textbooks. In addition, we examined the standardized test scores of students using the open textbooks and found no apparent differences in the results of students who used open textbooks compared with previous years when the same teachers’ students used traditional textbooks. However, given the limited sample of participating teachers, further investigation is needed.
Open-Access Textbooks and Financial Sustainability: A Case Study on Flat World Knowledge
John Hilton III,David Wiley
International Review of Research in Open and Distance Learning , 2011,
Abstract: Many college students and their families are concerned about the high costs of textbooks. A company called Flat World Knowledge both gives away and sells open-source textbooks in a way it believes to be financially sustainable. This article reports on the financial sustainability of the Flat World Knowledge open-source textbook model after one year of operation.
To Facebook, or not to Facebook?
John Hilton III & Kenneth Plummer
Digital Culture & Education , 2012,
Examining the Reuse of Open Textbooks
John Hilton III,David A. Wiley,Neil Lutz
International Review of Research in Open and Distance Learning , 2012,
Abstract: An important element of open educational resources (OER) is the permission to use the materials in new ways, including revising and remixing them. Prior research has shown that the revision and remix rates for OER are relatively low. In this study we examined the extent to which the openly licensed Flat World Knowledge textbooks were being revised and remixed. We found that the levels of revision and remix were similar to those of other OER collections. We discuss the possible significance and implication of these findings.
Human cytomegalovirus tegument proteins (pp65, pp71, pp150, pp28)
John Tomtishen III
Virology Journal , 2012, DOI: 10.1186/1743-422x-9-22
Abstract: Human cytomegalovirus (HCMV) is a member of the Betaherpesvirinae sub-family of Herpesviridae. It is a widespread pathogen that infects a majority of the world's population by early adulthood [1]. In fact, by the age of 40, between 50 and 85% of adults are infected by HCMV [2]. The virus establishes a life-long infection with some cells being latently infected, a state where the virus has the ability to lie dormant within a cell, while others are persistently infected, where the infection cannot be cleared from an organism and there is intermittent shedding of infectious virions [3]. Immunocompetent individuals, who can develop a strong immune response, typically display no symptoms of infection [4]. However, in individuals whose immune systems are immature or weakened, such as organ transplant and AIDS patients, HCMV is a significant pathogen causing morbidity and mortality [5]. Symptoms in these individuals typically consist of spiking fever, leucopenia (decrease in white blood cells), malaise, hepatitis, pneumonia, gastrointestinal disease and/or retinitis (inflammation of the retina) [4]. HCMV is also responsible for approximately 8% of infectious mononucleosis cases [6] and is the leading viral cause of birth defects often causing deafness and mental retardation in the fetus if a woman is infected during pregnancy [7].HCMV has been implicated in playing a role in inflammatory and proliferative diseases, including certain cardiovascular diseases and cancer [8]. Epidemiological and pathological studies have espoused a strong link between HCMV and atherosclerosis [8]. Several mechanisms have been proposed in which HCMV could influence the development of athersclerotic vascular abnormalities [9]. A proposed role of HCMV in the pathogenesis of atherosclerosis involves the reactivation of a latent HCMV infection followed by virus-induced enhancement of vascular inflammation and damage through smooth cell proliferation, uptake of low-density lipoproteins by smooth cel
Illicit tobacco trade between the United States and Mexico
Colledge III,John W;
Salud Pública de México , 2012, DOI: 10.1590/S0036-36342012000300011
Abstract: objective: to provide a brief history of the illicit tobacco trade between mexico and the united states. materials and methods: research included a previously published study: "cigarette taxes and smuggling: a statistical analysis and historical review", published by the mackinac center for public policy; us customs and border protection data; various us court documents; general accountability office reporting; media reports; other historical material, and a personal interview. results: the research revealed that there is no credible evidence of organized criminal activity related to the illicit trade in tobacco products from mexico into the united states. however, there is clear and convincing evidence of organized criminal activity in smuggling tobacco products from the united states into mexico for at least 167 years. conclusion: historical records from 1845 into the 21st century clearly demonstrate that the united states was usually the source country for tobacco products moving illegally between the two countries.
Review of Leadership for a Better World
John W Howard III
Partnerships : A Journal of Service-Learning and Civic Engagement , 2013, DOI: 10.7253/partj.v4i1.626
Abstract: N/A
The Oriental Lepidostomatidae (Trichoptera) Described by Banks and Hagen
John S. Weaver III
Psyche , 1985, DOI: 10.1155/1985/61376
Search for 1st-Generation Leptoquarks Using the ATLAS Detector
Stupak III John
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20122812012
Abstract: A search for the pair-production of scalar leptoquarks in 1 fb 1 of 7 TeV ATLAS data recorded at the LHC is presented. Leptoquarks are hypothetical color-triplet bosons which carry both quark and lepton flavor, and thus decay to a quark and a lepton, unlike any of the Standard Model particles. Leptoquarks arise from many beyond the Standard Model theories. The channels examined in this analysis require at least one leptoquark decay to an electron, which includes the final states eejj and eνjj. No excess of events is observed, thus limits on allowed leptoquark masses are determined. We exclude at 95% confidence level the production of first-generation scalar leptoquarks with mass mLQ < 660 (607) GeV when assuming a branching fraction of leptoquark decay to an electron of 1.0 (0.5).
Jigsaw model of the origin of life
John F. Mcgowan III
Physics , 2001, DOI: 10.1117/12.454759
Abstract: It is suggested that life originated in a three-step process referred to as the jigsaw model. RNA, proteins, or similar organic molecules polymerized in a dehydrated carbon-rich environment, on surfaces in a carbon-rich environment, or in another environment where polymerization occurs. These polymers subsequently entered an aqueous environment where they folded into compact structures. It is argued that the folding of randomly generated polymers such as RNA or proteins in water tends to partition the folded polymer into domains with hydrophobic cores and matching shapes to minimize energy. In the aqueous environment, hydrolysis or other reactions fragmented the compact structures into two or more matching molecules, occasionally producing simple living systems, also known as autocatalytic sets of molecules. It is argued that the hydrolysis of folded polymers such as RNA or proteins is not random. The hydrophobic cores of the domains are rarely bisected due to the energy requirements in water. Hydrolysis preferentially fragments the folded polymers into pieces with complementary structures and chemical affinities. Thus the probability of producing a system of matched, interacting molecules in prebiotic chemistry is much higher than usually estimated. Environments where this process may occur are identified. For example, the jigsaw model suggests life may have originated at a seep of carbonaceous fluids beneath the ocean. The polymerization occurred beneath the sea floor. The folding and fragmentation occurred in the ocean. The implications of this hypothesis for seeking life or prebiotic chemistry in the Solar System are explored.
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