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Search Results: 1 - 10 of 14215 matches for " Jan Rock "
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Toon Van Hal. ‘Moedertalen en taalmoeders’. Het vroegmoderne taalvergelijkende onderzoek in de Lage Landen
Jan Rock
De Zeventiende Eeuw : Cultuur in de Nederlanden in Interdisciplinair Perspectief , 2012,
Technological Progress in Radiation Therapy for Brain Tumors  [PDF]
Frederik Jozef Vernimmen, Kathy Rock
Journal of Cancer Therapy (JCT) , 2014, DOI: 10.4236/jct.2014.51005

To achieve a good therapeutic ratio the radiation dose to the tumor should be as high as possible with the lowest possible dose to the surrounding normal tissue. This is especially the case for brain tumors. Technological advancements in diagnostic imaging, dose calculations, and radiation delivery systems, combined with a better understanding of the pathophysiology of brain tumors have led to improvements in the therapeutic results. The widely used technology of delivering 3-D conformal therapy with photon beams (gamma rays) produced by Linear Accelerators has progressed into the use of Intensity modulated radiation therapy (IMRT). Particle beams have been used for several decades for radiotherapy because of their favorable depth dose characteristics. The introduction of clinically dedicated proton beam therapy facilities has improved the access for cancer patients to this treatment. Proton therapy is of particular interest for pediatric malignancies. These technical improvements are further enhanced by the evolution in tumor physiology imaging which allows for improved delineation of the tumor. This in turn opens the potential to adjust the radiation dose to maximize the radiobiological effects. The advances in both imaging and radiation therapy delivery will be discussed.

Measuring the Phases of G_E and G_M of the Nucleon
Stephen Rock
Physics , 2001,
Abstract: The nucleon electromagnetic form factors G_E and G_M are complex quantities in the time-like region. The absolute values can be determined by measuring the angular distribution of the nucleons in e^+ e^- --> N N-bar. The complex phase can only be determined by measuring one or more polarizations of the initial or final state. For PEP-N, we can use unpolarized e+ and e- and measure the polarization of one of the outgoing nucleons.
Acquisition of Weak Signals in Multi-Constellation Frequency Domain Receivers  [PDF]
Kaveh Mollaiyan, Rock Santerre, René Jr. Landry
Positioning (POS) , 2013, DOI: 10.4236/pos.2013.42014

New positioning applications’ availability requirements demand receivers with higher sensitivities and ability to process multiple GNSS signals. Possible applications include acquiring one signal per GNSS constellation in the same frequency band and combining them for increased sensitivity or predicting acquisition of other signals. Frequency domain processing can be used for this purpose, since it benefits from parallel processing capabilities of Fast Fourier Transform (FFT), which can be efficiently implemented in software receivers. On the other hand, long coherent integration times are mainly limited due to large FFT size in receivers using frequency domain techniques. A new method is proposed to address the problems in frequency domain receivers without compromising the resources and execution time. A pre-correlation accumulation (PCA) is proposed to partition the received samples into one-code-period blocks, and to sum them together. As a result, the noise is averaged out and the correlation results will gain more power, provided that the relative phase between the data segments is compensated for. In addition to simplicity, the proposed PCA method enables the use of one-size FFT for all integration times. A post-correlation peak combination is also proposed to remove the need for double buffering. The proposed methods are implemented in a configurable Simulink model, developed for acquiring recorded GNSS signals. For weak signal scenarios, a Spirent GPS simulator is used as a source. Acquisition results for GPS L1 C/A and GLONASS L1OF are shown and the performance of the proposed technique is discussed. The proposed techniques target GNSS receivers using frequency domain processing aiming at accommodating all the GNSS signals, while minimizing resource usage. They also apply to weak signal acquisition in frequency domain to answer the availability demand of today’s GNSS positioning applications.

Relationships between Structure, Composition, and Dynamics of the Pristine Northern Boreal Forest and Air Temperature, Precipitation, and Soil Texture in Quebec (Canada)
Louis Duchesne,Rock Ouimet
International Journal of Forestry Research , 2009, DOI: 10.1155/2009/398389
Abstract: This study reports on the contemporary structure, composition, and dynamics of the pristine northern boreal forest in Quebec, Canada, associated with air temperature, precipitation, and soil texture, using 147 permanent sample plots located at the limit of continuous forest in Quebec. The results show that tree species composition of stands is associated with stand age, soil texture, air temperature, and precipitation regime. After establishment of the pioneer cohort, the postsuccessional stand dynamics differed among temperature and precipitation regimes, probably because of their influence on tree growth. Our results support the hypothesis that shifts in forest composition related to stand dynamics and the subsequent senescing phase associated with the old growth stage generally occur sooner and proceed faster on more fertile sites due to quicker growth and the subsequent earlier mortality of pioneer species. This study suggests that climate warming should accelerate the successional dynamics of these ecosystems through its positive influence on tree growth.
Harnessing Social Networks along with Consumer-Driven Electronic Communication Technologies to Identify and Engage Members of 'Hard-to-Reach' Populations: A Methodological Case Report
Melanie J Rock
BMC Medical Research Methodology , 2010, DOI: 10.1186/1471-2288-10-8
Abstract: To identify and engage a small yet diverse sample of people who met an unusual set of criteria (i.e., pet owners who had been treating cats or dogs for diabetes), four sampling strategies were used. First, copies of a recruitment letter were posted in pet-friendly places. Second, information about the study was diffused throughout the study period via word of mouth. Third, the lead investigator personally sent the recruitment letter via email to a pet owner, who then circulated the information to others, and so on. Fourth, veterinarians were enlisted to refer people who had diabetic pets. The second, third and fourth strategies rely on social networks and represent forms of chain referral sampling.Chain referral sampling via email proved to be the most efficient and effective, yielding a small yet diverse group of respondents within one month, and at negligible cost.The widespread popularity of electronic communication technologies offers new methodological opportunities for researchers seeking to recruit from hard-to-reach populations.Many populations of interest to health researchers can be hard to reach. These populations may contain few members, be scattered over a large geographic area, be stigmatized, or represent elites with little interest in being studied [1]. The challenges of sampling from hard-to-reach populations are compounded in the absence of accurate or comprehensive information, and whenever few members of a target population regularly interact or even know each other [2]. This paper reports on the sampling strategies deployed for an ethnographic case study that, to explore connections between pet care and human health, focused on pet owner's involvement in treating dogs and cats for diabetes [3,4].A large number of people worldwide are treating dogs and cats for diabetes, yet I faced logistical, ethical, and resource allocation challenges in recruiting even a small number of them. People with diabetic pets constitute a low-frequency population who
Rese a de "Management" de Michael A. Hitt; J. Stewart Black & Lyman W. Porter
Juan Antonio Rock T.
Panorama Socioeconómico , 2006,
Exporting Success Factors: The Case of Chilean Firms
Juan Antonio Rock T.
Panorama Socioeconómico , 2010,
Abstract: El estudio se basó en las empresas exportadoras de Chile. El marco conceptual agrupa los factores que afectan la competitividad de las exportaciones en cuatro dimensiones: orientación estratégica internacional, la estrategia de operación de exportación, el éxito en la superación de las barreras, y el acceso a las ventajas extranjeras. Un análisis de asociaciones, de regresión con un método retrospectivo, permitió la identifi cación de los factores que afectaban exclusivamente el crecimiento de las exportaciones de las empresas exitosas. Desde la dimensión de la gestión estratégica, las variables identifi cadas y ordenadas según su importancia fueron las expectativas de los GGs en el posicionamiento en el mercado y el desarrollo de mercados, estrategias de colaboración, planifi cación de las exportaciones, y la pronta evaluación de las necesidades en el extranjero. Desde las competencias de dimensión para superar las barreras, las variables identifi cadas fueron las barreras arancelarias y el tama o de la empresa. Desde la dimensión de acceso a las ventajas competitivas extranjeras, las variables identifi cadas fueron los proveedores extranjeros, la inversión extranjera, investigación y desarrollo (I & D) y estudios extranjeros. En resumen, las empresas exportadoras de éxito en Chile siguieron una estrategia altamente fl exible para el desarrollo de mercados extranjeros que no se centró en el posicionamiento en cada uno, que fue impulsada por las necesidades de consumo previsto, y que ha establecido alianzas y redes de cooperación con empresas extranjeras. Las empresas de éxito lograron el acceso a las ventajas comparativas extranjeras o diamantes extranjeros a través de medios tales como la recepción de inversión extranjera, proyectos de I & D conjuntos con empresas extranjeras, y la formación de capital humano en países extranjeros.
Towards a Transpersonal Psychology of Daoism: Definitions, Past Research, and Future Directions
Christopher Cott,Adam Rock
International Journal of Transpersonal Studies , 2009,
Abstract: This paper is aimed at facilitating the study of Daoism, a collection of Chinese philosophical beliefs and psychospiritual practices with a history of thousands of years and a living community that stretches throughout East Asia, from a transpersonal psychology perspective.Transpersonal psychologists who wish to embark upon a study of Daoist phenomenamust first be cognizant of the often nebulous parameters of the Daoist field of inquiry.Therefore, an overview is offered of the two primary Daoist informational sources: the living Daoist tradition as represented predominantly by the Quanzhen and Tianshi traditions, and textual sources in collections such as the Daozang and the Zangwai Daoshu. Some critical issues are highlighted, such as the fact that transpersonal psychologists need to be mindful of various inherent difficulties associated with the study of Daoism (e.g., problems interpreting allegorical and even deliberately encoded texts in the absence of the necessary oral transmissions). Finally, a number of avenues for future research are put forward in the interest of facilitating the transpersonal study of Daoism.
Why Does the Universe Exist? An Advaita Vedantic Perspective
Adam J. Rock
International Journal of Transpersonal Studies , 2005,
Abstract: Debates concerning causal explanations of the universe tend to be based on a priori propositions (e.g., Edwards, 1973; Smith, 1995; Swinburne, 1978). The present paper, however, addresses the metaphysical question, “Why does the universe exist?” from the perspective of a school of Hindu philosophy referred to as advaita vedanta and two of its a posteriori derived creation theories: thetheory of simultaneous creation (drishti-srishti vada) and the theory of non-causality (ajata vada).Objections to advaita vedanta are also discussed. It is concluded that advaita vedanta has the potential to make a significant contribution to contemporary metaphysical debate in general andour understanding of the question, “Why does the universe exist?” in particular.
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