Gamma models

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  • Air pollution has always been a trans-boundary environmental problem and a matter of global concern for past many years. High concentrations of air pollutants due to numerous anthropogenic activities influence the air quality. There are many books on this subject, but the one in front of you will probably help in filling the gaps existing in the area of air quality monitoring, modelling, exposure, health and control, and can be of great help to graduate students professionals and researchers.

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  • The final article in this section presents a modification to the Green’s function approach for modeling acoustic pressure, where the use of conformal mapping is replaced by a group of bound vortices. The author shows that the approach is readily extended to three dimensions. The method is discussed in the context of aircraft noise.

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  • This book was conceived as a result of many years research with students and postdocs in molecular simulation, and shaped over several courses on the subject given at the University of Groningen, the Eidgen¨ossische Technische Hochschule (ETH) in Z¨urich, the University of Cambridge, UK, the University of Rome (La Sapienza), and the University of North Carolina at Chapel Hill, NC, USA.

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  • It is well known that occurrence counts of words in documents are often modeled poorly by standard distributions like the binomial or Poisson. Observed counts vary more than simple models predict, prompting the use of overdispersed models like Gamma-Poisson or Beta-binomial mixtures as robust alternatives. Another deficiency of standard models is due to the fact that most words never occur in a given document, resulting in large amounts of zero counts. We propose using zeroinflated models for dealing with this, and evaluate competing models on a Naive Bayes text classification task.

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  • Hydrodynamics has experienced a long history. A substantial growth of knowledge in this field has been happening since the 18th century. It is applicable in a wide variety of areas, such as ocean engineering, environmental engineering, water conservancy, energy exploration, and chemical engineering, to name a few. Over the past several decades, good progress has been made in physical models, computational methods, and theoretical studies, which significantly expanded the understanding and the engineering implications of hydrodynamics....

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  • Some carotenoids are considered as nutrients, such as alpha-, beta-, and gamma-carotene, and alpha- and beta-cryptoxanthin, exhibiting vitamin A activity following their metabolisation into retinol by humans (Biehler & Bohn, 2010; Biehler et al., 2010). Carotenoids are pigments with several conjugated double bonds (polyene chain), which could be divided into oxygen containing carotenoids (oxocarotenoids or xanthophylls), and non-oxygen containing carotenoids (carotenes).

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  • Monte-Carlo modeling allows calculating the detector efficiency in gamma spectrometry of environmental samples with taking into consideration both the photon selfabsorption in sample itself and absorption in all other materials between the sample and the detector’s active part. In this paper, the peak efficiencies of the Hp Ge detector (GMX) for gammas at various energies (emitted isotropically from the standard disk source and volumetric source - environmental sample, in which the different radionuclides are present) ...

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  • Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Gamma distribution approach in chanceconstrained stochastic programming model

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  • As an example of how queries are executed, consider the query shown in Figure 5. In Figure 6, the processes used to execute the query are shown along with the flow of data between the various processes for a Gamma configuration consisting of two processors with disks and two processors without disks. Since the two input rela- tions A and B are partitioned across the disks attached to processors P1 and P2, selection and scan operators are ini- tiated on both processors P1 and P2.

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  • FADING CHANNEL CHARACTERIZATION AND MODELING and hence, following (2.3), the instantaneous SNR per symbol of the channel, , is distributed according to an exponential distribution given by p D 1 exp , ½0 2.7 The MGF corresponding to this fading model is given by M s D 1 s 1 2.8 In addition, the moments associated with this fading model can be shown to be given by 2.9 E[ k ] D  1 C k k where  Ð is the gamma function. The Rayleigh fading model therefore has an AF equal to 1 and typically agrees very well with experimental data for mobile...

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