Family Sense of Coherence Scale: A Confirmatory Factor Analysis in a Portuguese Sample

Background: Family sense of coherence (FSOC) can be defined as the cognitive map of a family that enables the family to deal with stress during their lifetime. FSOC is the degree to which a family perceives family life as comprehensible, manageable, and meaningful. To the best of our knowledge, few studies have used this scale, and very few have evaluated FSOC Scale psychometric properties.Objective: This study aimed to evaluate the psychometric properties of the original FSOC Scale in a sample of Portuguese caregivers of children aged between 10 and 15 years.Methods: A total of 329 caregivers completed a sociodemographic questionnaire and the FSOC Scale. Analyses were performed to evaluate the factor structure of the FSOC Scale with 26 items as well as composite reliability, internal consistency, convergent-related validity, and discriminant-related validity of the scale scores.Results: The findings supported a three-factor solution for a 13-item version that maintains the original FSOC Scale structure. The three FSOC dimensions presented a good fit to the data. Cronbach’s alpha, composite reliability, and convergent-related validity were considered very good for the FSOC Scale (α = 0.956; CR = 0.974; AVE = 0.689). No evidence of discriminant-related validity was found for the dimensions of FSOC.Conclusion: The findings support the use of the Portuguese FSOC Scale for research and clinical purposes with Portuguese caregivers. Future research is necessary to further develop a European Portuguese version of the FSOC Scale.Implications: This study provides a psychometric evaluation of FSOC Scale characteristics in a Portuguese sample. The results are helpful for clinicians and family therapists who work with families since it could help them to assess the resources of families and their ability to cope with adversity and enhance their strengths.

Analysis of the distribution, rotation and scale characteristics of solar wind switchbacks: comparison between the first and second encounters of Parker Solar Probe

The S-shaped magnetic structure in the solar wind formed by the twisting of magnetic field lines is called a switchback, whose main characteristics are the reversal of the magnetic field and the significant increase in the solar wind radial velocity. We identify 242 switchbacks during the first two encounters of Parker Solar Probe (PSP). Statistics methods are applied to analyze the distribution and the rotation angle and direction of the magnetic field rotation of the switchbacks. The diameter of switchbacks is estimated with a minimum variance analysis (MVA) method based on the assumption of a cylindrical magnetic tube. We also make a comparison between switchbacks from inside and the boundary of coronal holes. The main conclusions are as follows: (1) the rotation angles of switchbacks observed during the first encounter seem larger than those of the switchbacks observed during the second encounter in general; (2) the tangential component of the velocity inside the switchbacks tends to be more positive (westward) than in the ambient solar wind; (3) switchbacks are more likely to rotate clockwise than anticlockwise, and the number of switchbacks with clockwise rotation is 1.48 and 2.65 times of those with anticlockwise rotation during the first and second encounters, respectively; (4) the diameter of switchbacks is about 10^5 km on average and across five orders of magnitude (10^3 – 10^7 km).

The Byzantine Military Strategy in Asia Minor During the Early Palaiologan Period (1259–1328)

Introduction. The purpose of the article is to determine the specifics of the Byzantine war strategy in Asia Minor. A qualitative military and political characteristics of the main military expeditions to the eastern borders are crucial for the disclosure of this problem. From this aspect, the study addresses the following issues: defining of the role of the eastern military campaigns in the complex of military-strategic measures on the state scale; characteristics of the features the armed forces used, as well as the tasks solved during military expeditions to Asia Minor; disclosure of the features of military-technical measures to ensure the security of Byzantium eastern borders. Methods. Critical use of elements of civilizational, formational and systemic approaches is the methodological basis of this study. It should be noted that the use of a systematic approach in the analysis of the Byzantine troops combat practice in east direction, allows to determine the strategic objectives of military expeditions in Asia Minor, to reveal the logic of warfare in the eastern theater, to determine the functional purpose of military-technical measures. Analysis and Results. The study reveals the strategic concept of Byzantium armed forces military operations during the reign of the first Palaeologus on the Asia Minor territory. Analysis of combat practice allows us to conclude that the strategic priority of the western and northwestern directions, which required the use of the most combat-ready troops consisting of mercenaries during the reign of Michael VIII, determined the need to use the Byzantine troops at the eastern borders of the empire. TheByzantine army was episodically involved in major defensive expeditions to the borders of the empire. We determined that the purpose of these campaigns is to stop the advance of enemy armies and their subsequent expulsion from the empire. This logic of military operations does not mean the loss of strategic initiative at the eastern direction. The strategy of passive defense which determined the nature of the military confrontation in the Asia Minor region was ensured by the creation of a garrison system, or a line of fortresses, on the eastern borders of the empire. Fortification activities of Michael VIII and Andronikos II in 1280–1282 temporarily stopped the advance of the Turkish troops. However, natural factors and the intensification of the economic crisis at the end of the 13th century made it impossible to preserve the defensive line located along the banks of the rivers that served as the borders of the Byzantine state. In addition, the strengthening of the military-political power of the emirates of Menteşe, Aydinoglu and Osman led to the loss of the initiative by the Byzantine troops and, as a result, the reduction of the Asia Minor territories of the empire. In an effort to change the situation, Andronicus II proceeded to implement an active defense strategy.

Cloud-Based User Behavior Emulation Approach for Space-Ground Integrated Networks

Cyber-physical systems (CPSs) based on space-ground integrated networks (SGINs) enable CPSs to break through geographical restrictions in space. Therefore, providing a test platform is necessary for new technical verification and network security strategy evaluations of SGINs. User behavior emulation technology can effectively support the construction of a test platform. Given the inherent dynamic changes, diverse behaviors, and large-scale characteristics of SGIN users, we propose user behavior emulation technology based on a cloud platform. First, the dynamic emulation architecture for user behavior for SGINs is designed. Then, normal user behavior emulation strategy driven by the group user behavior model in real time is proposed, which can improve the fidelity of emulation. Moreover, rogue user behavior emulation technology is adopted, based on traffic replay, to perform the security evaluation. Specifically, virtual Internet Protocol (IP) technology and the epoll model are effectively integrated in this investigation to resolve the contradiction between large-scale emulation and computational overhead. The experimental results demonstrate that the strategy meets the requirement of a diverse and high-fidelity dynamic user behavior emulation and reaches the emulation scale of 100,000-level concurrent communication for normal users and 100,000-level concurrent attacks for rogue users.

Dielectric Strength of Polymeric Solid–Solid Interfaces under Dry-Mate and Wet-Mate Conditions

One of the most important causes of insulation system failure is the breakdown of the interface between two solid dielectrics; understanding the mechanisms governing this breakdown phenomenon is therefore critical. To that end, investigating and reviewing the practical limitations of the electrical breakdown strength of solid–solid interfaces present in insulating components is the primary objective of this work. The published literature from experimental and theoretical studies carried out in order to scrutinize the effects of the presence of solid–solid interfaces is investigated and discussed, considering macro, micro, and nano-scale characteristics. The reviewed literature suggests that solid–solid interfaces in accessories have non-uniform distributions of electrical fields within them in comparison to cables, where the distribution is mostly radial and symmetrical. Many agree that the elastic modulus (elasticity), radial/tangential pressure, surface smoothness/roughness, and dielectric strength of the ambient environment are the main parameters determining the tangential AC breakdown strength of solid–solid interfaces.

Surface environment of Phobos and Phobos simulant UTPS

The Martian Moons eXploration (MMX) mission will study the Martian moons Phobos and Deimos, Mars, and their environments. The mission scenario includes both landing on the surface of Phobos to collect samples and deploying a small rover for in situ observations. Engineering safeties and scientific planning for these operations require appropriate evaluations of the surface environment of Phobos. Thus, the mission team organized the Landing Operation Working Team (LOWT) and Surface Science and Geology Sub-Science Team (SSG-SST), whose view of the Phobos environment is summarized in this paper. While orbital and large-scale characteristics of Phobos are relatively well known, characteristics of the surface regolith, including the particle size-distributions, the packing density, and the mechanical properties, are difficult to constrain. Therefore, we developed several types of simulated soil materials (simulant), such as UTPS-TB (University of Tokyo Phobos Simulant, Tagish Lake based), UTPS-IB (Impact-hypothesis based), and UTPS-S (Simpler version) for engineering and scientific evaluation experiments.

Genz and Mendell-Elston Estimation of the High-Dimensional Multivariate Normal Distribution

Statistical analysis of multinomial data in complex datasets often requires estimation of the multivariate normal (mvn) distribution for models in which the dimensionality can easily reach 10–1000 and higher. Few algorithms for estimating the mvn distribution can offer robust and efficient performance over such a range of dimensions. We report a simulation-based comparison of two algorithms for the mvn that are widely used in statistical genetic applications. The venerable Mendell-Elston approximation is fast but execution time increases rapidly with the number of dimensions, estimates are generally biased, and an error bound is lacking. The correlation between variables significantly affects absolute error but not overall execution time. The Monte Carlo-based approach described by Genz returns unbiased and error-bounded estimates, but execution time is more sensitive to the correlation between variables. For ultra-high-dimensional problems, however, the Genz algorithm exhibits better scale characteristics and greater time-weighted efficiency of estimation.