The Mexican subduction zone, the Gulf of California spreading center, as well as the triple junction point around the Jalisco and the Michoacán Blocks, represents the most active seismogenic belts inducing seismic hazard in the Jalisco-Colima-Michoacán region. Herein, considering such seismotectonic setting, we develop a new seismic source model for the surrounding of Jalisco-Colima-Michoacán to be used as an input in the assessment of the seismic hazard of the region. This new model is based on revised Poissonian earthquake (1787-2018) and focal mechanism (1963-2015) catalogs, as well as crustal thickness data and all information about the geometry of the subducting slabs. The proposed model consists of a total of 37 area sources, comprising all the three different possible categories of seismicity: shallow crustal, interface subduction, and inslab earthquakes. A special care was taken during the delimitation of the boundaries for each area source to ensure that they represent a relatively homogeneous seismotectonic region, and to include a relatively large number of earthquakes that enable us to compute as reliable as possible seismicity parameters. Although the sources were delimited following the standard criteria of assessing the probabilistic seismic hazard, they are also characterized in terms of their seismicity parameters (annual rate of earthquakes above Mw 4.0, b-value, and maximum expected magnitude), mean seismogenic depth, as well as the predominant stress regime. The proposed model defines and characterizes regionalized potential seismic sources that can contribute to the seismic hazard at the Jalisco-Colima-Michoacán region, providing the necessary information for seismic hazard estimates.

A probabilistic seismic hazard assessment in terms of peak ground acceleration (PGA)
and spectral acceleration (SA) values, for both 10% and 5% probability of exceedance in 50 years,
has been performed for the United Arab Emirates, Qatar, and Bahrain. To do that, an updated, unified,
and Poissonian earthquake catalog (since 685 to 2019) was prepared for this work. Three alternative
seismic source models were considered in a designed logic-tree framework. The discrimination
between the shallow and intermediate depth seismicity along the Zagros and the Makran regions
was also considered in this assessment. Three alternative ground-motion attenuation models for
crustal earthquakes and one additional for intermediate-depth ones have been selected and applied
in this study, considering the predominant stress regime computed previously for each defined
source. This assessment highlights that the maximum obtained hazard values are observed in the
northeastern part of the studied region, specifically at Ras Al-Khaimah, Umm Al-Quwain, and
Fujaira, being characterized by mean PGA and SA (0.2 s) pair values equal to (0.13 g, 0.30 g), (0.12 g,
0.29 g), and (0.13 g, 0.28 g), respectively, for a 475-year return period and for B/C National Earthquake
Hazards Reduction Program (NEHRP) boundary site conditions. Seismic hazard deaggregation in
terms of magnitude and distance was also computed for a return period of 475 years, for ten emirates
and cities, and for four dierent spectral periods.

Color face recognition has more attention recently since it considered one of the most popular biometric pattern recognitions.
With a considerable development in multimedia technologies, finding a suitable color information extraction from
color images becomes a hard problem. Several color face recognition methods have been developed. However, these
methods still suffer from some limitations, such as increasing the number of extracted features, which leads to an increase
in computational time. Besides, among those features some of them are redundant and irrelevant that will influence the
quality of the recognition. Therefore, this paper presents a novel color face recognition method that depends on a new
family of fractional-order orthogonal functions, which is called orthogonal fractional-order exponent functions. Then,
using these functions as the basis functions of novel multi-channel orthogonal fractional-order exponent moments
(FrMEMs), these novel descriptors are defined in polar coordinates over the unit circle and have many characteristics. A set
of experimental series are performed using a set of well-known color face recognition and compared with other CFR
techniques. Besides, a group of feature selection methods with different classifiers used to evaluate the number of extracted
features is suitable or needs to be enhanced. Experimental results illustrate that the proposed method based on FrMEMs
outperforms other CFR methods. As well as, the recognition rate doesn’t influence by reducing the number of features
using different FS methods.

A new chalcogenide-alkali metal alloy of Se80Te8(NaCl)12 has been prepared by a melt-quench technique. The crystallized phases due to the thermal annealing are observed by X-ray diffraction of the powdered sample. The glass transition and kinetics of crystallization in the Se80Te8(NaCl)12 alloy are studied using the differential scanning calorimetric technique under non-isothermal conditions. The activation energy of the glass transition is evaluated by Kissinger and Mahadevan methods. The crystallization activation energy (Ec) is calculated by isoconversion Friedman methods. The decrease of Ec with increasing crystallization conversion is attributed to the complex mechanism of the crystallization process. Based on the shape of the characteristic kinetic function, the crystallization growth is found to be a three-dimensional growth from the bulk nuclei. The results show that the conditions of the Sestak–Berggren model are satisfied for describing the crystallization process of the studied Se80Te8(NaCl)12 alloy. The parameters M and N involved in this model are calculated and related to the crystallization process.

A new chalcogenide-alkali metal alloy of Se80Te8(NaCl)12 has been prepared by a melt-quench technique. The crystallized phases due to the thermal annealing are observed by X-ray diffraction of the powdered sample. The glass transition and kinetics of crystallization in the Se80Te8(NaCl)12 alloy are studied using the differential scanning calorimetric technique under non-isothermal conditions. The activation energy of the glass transition is evaluated by Kissinger and Mahadevan methods. The crystallization activation energy (Ec) is calculated by isoconversion Friedman methods. The decrease of Ec with increasing crystallization conversion is attributed to the complex mechanism of the crystallization process. Based on the shape of the characteristic kinetic function, the crystallization growth is found to be a three-dimensional growth from the bulk nuclei. The results show that the conditions of the Sestak–Berggren model are satisfied for describing the crystallization process of the studied Se80Te8(NaCl)12 alloy. The parameters M and N involved in this model are calculated and related to the crystallization process.

A new chalcogenide-alkali metal alloy of Se80Te8(NaCl)12 has been prepared by a melt-quench technique. The crystallized phases due to the thermal annealing are observed by X-ray diffraction of the powdered sample. The glass transition and kinetics of crystallization in the Se80Te8(NaCl)12 alloy are studied using the differential scanning calorimetric technique under non-isothermal conditions. The activation energy of the glass transition is evaluated by Kissinger and Mahadevan methods. The crystallization activation energy (Ec) is calculated by isoconversion Friedman methods. The decrease of Ec with increasing crystallization conversion is attributed to the complex mechanism of the crystallization process. Based on the shape of the characteristic kinetic function, the crystallization growth is found to be a three-dimensional growth from the bulk nuclei. The results show that the conditions of the Sestak–Berggren model are satisfied for describing the crystallization process of the studied Se80Te8(NaCl)12 alloy. The parameters M and N involved in this model are calculated and related to the crystallization process.

A new chalcogenide-alkali metal alloy of Se80Te8(NaCl)12 has been prepared by a melt-quench technique. The crystallized phases due to the thermal annealing are observed by X-ray diffraction of the powdered sample. The glass transition and kinetics of crystallization in the Se80Te8(NaCl)12 alloy are studied using the differential scanning calorimetric technique under non-isothermal conditions. The activation energy of the glass transition is evaluated by Kissinger and Mahadevan methods. The crystallization activation energy (Ec) is calculated by isoconversion Friedman methods. The decrease of Ec with increasing crystallization conversion is attributed to the complex mechanism of the crystallization process. Based on the shape of the characteristic kinetic function, the crystallization growth is found to be a three-dimensional growth from the bulk nuclei. The results show that the conditions of the Sestak–Berggren model are satisfied for describing the crystallization process of the studied Se80Te8(NaCl)12 alloy. The parameters M and N involved in this model are calculated and related to the crystallization process.

Carbon nano-dots (CDs) are considered nowadays as one of the most interesting fluorescence nanomaterials with various technological applications in almost all aspects of needs e.g., in medicine, biology and engineering. Yet, as reported in many previous works, un-doped CDs suffer from low quantum yield particularly when synthesized at relatively low temperatures. Here, we report on synthesis and characterization of a small size (4.7 nm in diameter) intentionally un-doped CDs with high fluorescence intensity, from Folic Acid as a single precursor, using hydrothermal process at relatively low temperature 200 °C. By attaching organics species of diamine-terminated oligomeric poly-ethylene glycol (PEG) to the surface of the derived CDs, a much stronger photoluminescence from the passivated dots was observed. Namely, we observe a strong enhancement of the CDs quantum yield from 44.4% to 67.5% by …

Fluorescent carbon quantum dots (CQDs) have been emerged in countless applications due to their interesting optical, surface properties, and the simplicity of their synthetic routes. On the other hand, pyridine is toxic that could inter into the human living environment causing many health problems, e.g. asthmatic breathing and laryngitis. Here, water-soluble 2.75 nm size N-doped CQDs have been synthesized from folic acid and used as chemo-sensor for the determination of pyridine. It was found that pyridine can quench the fluorescence of N-CQDs effectively. The quenching is explained in terms of Stern–Volmer relation and confirmed by fluorescence lifetime measurements to have a dynamic character with a predetermined electron transfer. The detection limit for pyridine was found to be 18 nM. To the best of our knowledge, such a small detection limit is more than three orders of magnitude smaller than that obtained so far for pyridine detection using any other facile methods.

Aniline has been classified as a probable human carcinogen which can cause severe respiratory tract irritation and congestion to humans. Here, we propose using ultra-small (1.8 nm) colloidal nitrogen-doped carbon nano-dots (N-CDs), that is green synthesized at a low temperature of only 100 °C from ultrasonic-processed water-soluble folic acid, as a novel turn-off fluorescent chemo-sensor for ultrasensitive detection of aniline in aqueous medium. It was found that the Stern-Volmer relation describes very well the fluorescence quenching of N-CDs by aniline and confirms a static quenching mechanism between them. Compared to other techniques, our N-CDs based optical detection method, is the simplest and the most ultrasensitive method for aniline liquid detection, reaching an exceptional low detection limit of 3.57 nM (0.332 ppb). The proposed method was successfully applied for determination of aniline in a tap water sample without significant interferences from the matrix.