نتایج جستجو برای: ncpa
تعداد نتایج: 46 فیلتر نتایج به سال:
Context. Several exoplanet direct-imaging instruments (VLT-SPHERE, Gemini Planet Imager, etc.) will soon be in operation, providing original data for comparative exoplanetary science to the community. To this end, exoplanet imagers use an extreme adaptive optics (XAO) system to correct the atmospheric turbulence and provide a highly corrected beam to a near-infrared (NIR) coronagraph for suppre...
Recent years have seen the rapid growth of private think tanks within the neoconservative movement that conduct "policy research" biased to their own agenda. This article provides an evidence-based rebuttal to a 2002 report by one such think tank, the Dallas-based National Center for Policy Analysis (NCPA), which was intended to discredit 20 alleged myths about single-payer national health insu...
In birds, changes in hypothalamic gonadotropin-releasing hormone-I (GnRH-I) content and release are correlated with reproductive stages. This study examined the distribution and expression level of GnRH-I mRNA in anatomically discrete hypothalamic nuclei throughout the turkey reproductive cycle and following photostimulation. GnRH-I mRNA expression was determined using in situ hybridization in ...
The Feistel-network is a popular structure underlying many block-ciphers where the cipher is constructed from many simpler rounds, each defined by some function which is derived from the secret key. Luby and Rackoff showed that the three-round Feistel-network – each round instantiated with a pseudorandom function secure against adaptive chosen plaintext attacks (CPA) – is a CPA secure pseudoran...
The frog Leptodactylus validus occurs in northern South America, Trinidad and Tobago, and the southern Lesser Antilles (Grenada and St. Vincent). Mitochondrial DNA sequences were used to perform a nested clade phylogeographic analysis (NCPA), to date colonization events, and to analyze colonization patterns using on a relaxed molecular clock and coalescent simulations. L. validus originated on ...
Statistical methods such as Scheffe’s and Osadebe’s models are commonly employed for the optimization of concrete properties. Despite their prediction suitability, attention is drawn to drawback. Ibearugbulem’s model has been developed address these shortcomings. In this study, method was formulate a mathematical strength-optimization nanostructured cassava peel ash (NCPA)-cement composite. The...
Two species of horned lizards are sympatric along the periphery of the Salton Trough. Phrynosoma mcallii , endemic to the trough, is of conservation concern because its limited habitat has been fragmented by human activities. A more common and widespread species, Phrynosoma platyrhinos , occurs around the periphery of the trough and much further to the North. The two species are syntopic at a f...
Coronagraphic imaging of exoplanets and circumstellar environments using ground-based instruments on large telescopes is intrinsically limited by speckles induced uncorrected aberrations. These aberrations originate from the imperfect correction atmosphere an extreme adaptive optics system; static optical defects; or small opto-mechanical variations due to changes in temperature, pressure, grav...
Recent papers have promoted the view that model-based methods in general, and those based on Approximate Bayesian Computation (ABC) in particular, are flawed in a number of ways, and are therefore inappropriate for the analysis of phylogeographic data. These papers further argue that Nested Clade Phylogeographic Analysis (NCPA) offers the best approach in statistical phylogeography. In order to...
The purpose of this study is to identify genetically distinct clusters of individuals based on related characteristic traits (namely phenotypic data) or geographical locations (namely phylogeographic data). There are 2 main steps to this process: inferring the genetic history of the sequences under study, and subsequently identifying significant clusters according to the phenotypic/phylogeograp...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید