Talbot effect for dispersion in linear optical fibers and a wavelet approach

We shortly recall the mathematical and physical aspects of Talbot's self-imaging effect occurring in near-field diffraction. In the rational paraxial approximation, the Talbot images are formed at distances z=p/q, where p and q are coprimes, and are superpositions of q equally spaced images of the original binary transmission (Ronchi) grating. This interpretation offers the possibility to express the Talbot effect through Gauss sums. Here, we pay attention to the Talbot effect in the case of dispersion in optical fibers presenting our considerations based on the close relationships of the mathematical representations of diffraction and dispersion. Although dispersion deals with continuous functions, such as gaussian and supergaussian pulses, whereas in diffraction one frequently deals with discontinuous functions, the mathematical correspondence enables one to characterize the Talbot effect in the two cases with minor differences. In addition, we apply, for the first time to our knowledge, the wavelet transform to the fractal Talbot effect in both diffraction and fiber dispersion. In the first case, the self similar character of the transverse paraxial field at irrational multiples of the Talbot distance is confirmed, whereas in the second case it is shown that the field is not self similar for supergaussian pulses. Finally, a high-precision measurement of irrational distances employing the fractal index determined with the wavelet transform is pointed outComment: 15 text pages + 7 gif figs, accepted at Int. J. Mod. Phys. B, final version of a contribution at ICSSUR-Besancon (May/05). Color figs available from the first autho

Can carbon capture and geologic storage mitigate greenhouse gases?

Bureau of Economic Geolog

An atlas of CO2 storage potential in the nearshore waters of the Texas coast – American Recovery and Reinvestment Act – “Gulf of Mexico Miocene CO2 site characterization mega-transect”

Bureau of Economic Geolog

Hubungan antara Faktor Sosio Ekonomi Ibu terhadap Pengetahuan Mengenai Tuberkulosis

Tuberkulosis (TB) dan kematian akibat infeksinya merupakan masalah kesehatan di Indonesia. Penelitian ini bertujuan mengetahui hubungan pengetahuan mengenai TB denganfaktor sosio-ekonomi. Desain penelitian adalah cross sectional dengan sampel 2419 ibu yangdipilih secara acak menggunakan sistem polygonal random sampling dari 11 kelurahan terpadat diJakarta Timur. Data diuji dengan chi-square. Hasil penelitian menunjukkan hanya 335 responden(14%) yang menjawab seluruh pertanyaan dengan benar dan berhubungan dengan status kerja, penghasilan keluarga, pendidikan terakhir dan sumber informasi. Pengetahuan mengenai TB yang tinggi berhubungan dengan status ibu yang tidak bekerja (p=0,004 RP 0,894 IK95% 0,83;0,97),penghasilan keluarga yang tinggi (p<0,001 RP 1,33 IK95% 1,12;1,15), pendidikan terakhir yangtinggi (p<0,001 RP 1,41 IK95% 1,31; 1,51), dan mendapatkan informasi (p<0,001 RP 0,082IK95% 0,037; 0,178). Pengetahuan yang benar mengenai TB masih rendah dan televisi berperanbesar dalam meningkatkan pengetahuan mengenai TB pada ibu di Jakarta Timur. Disimpulkanpengetahuan mengenai TB berhubungan dengan faktor-faktor sosio ekonomik ibu dan dapatditingkatkan dengan sumber informasi yang tepat

Statistical analysis of historic hydrocarbon production data from Gulf of Mexico oil and gas fields and application to dynamic capacity assessment in CO2 storage

Bureau of Economic Geolog

Application of Volcano Plots in Analyses of mRNA Differential Expressions with Microarrays

Volcano plot displays unstandardized signal (e.g. log-fold-change) against noise-adjusted/standardized signal (e.g. t-statistic or -log10(p-value) from the t test). We review the basic and an interactive use of the volcano plot, and its crucial role in understanding the regularized t-statistic. The joint filtering gene selection criterion based on regularized statistics has a curved discriminant line in the volcano plot, as compared to the two perpendicular lines for the "double filtering" criterion. This review attempts to provide an unifying framework for discussions on alternative measures of differential expression, improved methods for estimating variance, and visual display of a microarray analysis result. We also discuss the possibility to apply volcano plots to other fields beyond microarray.Comment: 8 figure

The Impact of Aquatic Based Plyometric Training on Jump Performance: A Critical Review

International Journal of Exercise Science 14(6): 815-828, 2021. There is evidence to suggest that aquatic plyometric training (APT) may be an effective and safer alternative to traditional land-based plyometric training (LPT) when training to increase jump performance. The aim of this review was to critically examine the current literature regarding the effects of APT vs. LPT on jump performance in athletic populations. Key terms were employed in five separate databases to complete the current review. Available articles were screened for inclusion and exclusion criteria to determine which studies were deemed eligible for review. Outcome measure in these studies included those assessing lower extremity power and jump performance (i.e., drop jumps, broad jumps, sergeant jumps, repeated countermovement jumps, and vertical jumps). All but one of the studies included in this critical review showed significant improvements in jump performance after LPT and APT interventions. Both LPT and APT groups experienced similar increases in jump performance and lower-body power, pre- to post-test, in the majority of the studies examined in this review. LPT and APT have the ability to improve lower extremity explosive strength and jump performance within athletic populations. Improvements in lower body power may improve overall athletic performance. Observations from this review may be used by sport coaches, strength coaches, and athletes alike to weigh the pros and cons of both forms of plyometric training. Observations from this review may also be used to weigh the pros and cons of APT over LPT in terms of reducing risk of injury