Internal Origin Research Articles

Linear Versus Nonlinear Methods for Detecting Magnetospheric and Ionospheric Current Systems Patterns

AbstractThere is a growing interest in the development of models and methods of analysis aimed to recognize in the geomagnetic field signals the different contributions coming from the various sources both internal and external to the Earth. Many models describing the geomagnetic field of internal and external origin have been developed. Here, we investigate the possibility to recognize in the magnetic field of external origin the different contributions coming from external sources. We consider the measurements of the vertical component of the geomagnetic field recorded by the European Space Agency (ESA) Swarm A and B satellites at low and mid latitudes during a geomagnetically quiet period. We apply two different methods of analysis: a linear method, that is, the empirical orthogonal function (EOF), and a nonlinear one, that is, the multivariate empirical mode decomposition (MEMD). Due to the high nonlinear behavior of the different external contributions to the magnetic signal the MEMD seems to recognize better than EOF the main intrinsic modes capable of describing the different magnetic spatial structures embedded in the analyzed signal. By applying the MEMD only five modes and a residue are necessary to recognize the different contributions coming from the external sources in the magnetic signal against the 26 modes that are necessary in the case of the EOF. This study is an example of the potential of the MEMD to give new insights into the analysis of the geomagnetic field of external origin and to separate the ionospheric signal from the magnetospheric one in a simple and rapid way.

Spatial-Temporal Variation Characteristics of Vertical Dust Flux Simulated by WRF-Chem Model with GOCART and AFWA Dust Emission Schemes (Case Study: Central Plateau of Iran)

Dust and sand storms are among the major threats to central Iran. These phenomena pose irreparable risks to natural ecosystems and human societies, including effects on health. In this study, the spatial and temporal pattern of vertical dust flux (VDF) was used to identify dust sources as well as areas with high potential for dust generation. To simulate VDF, two intense dust storms, from 21 February 2015 and 14 February 2018, were selected using synoptic data and Moderate Resolution Imaging Spectroradiometer (MODIS) images. These dust storms were identified as responsible for a reduction of horizontal visibility to less than 1000 m, using remote sensing tools and Ackerman Dust Index. MODIS images show that these two storms covered most of Central Plateau of Iran. The Weather Research and Forecasting model with chemistry (WRF-Chem) was used to simulate the storms, with either the Global Ozone Chemistry Aerosol Radiation and Transport (GOCART) or Air Force Weather Agency (AFWA) scheme to calculate VDF. Modeled vertical dust fluxes in both events indicate that the Arabian deserts in Saudi Arabia and in southwestern Iran can be identified as main sources of the dust in the central Iranian plateau. The other source of dust is the Hirmand Basin, located in the country of Afghanistan and in the southeast of Iran. The results of VDF simulations indicate that central southeast Iran could be the main dust source of internal origin. Additionally, over seasonal wetlands in Iran, the amount of VDF was simulated to be sometimes over 4000 μg/(m2s), an indication that these areas are sensitive to wind erosion in dry conditions and can be a source of dust. The WRF-Chem results were compared with the horizontal visibility measured in synoptic stations in the area. The results showed that the coefficients of determination of GOCART results with the measured horizontal visibility on 21 February 2015 and 14 February 2018 were 0.72 and 0.76, respectively, while the coefficient values from the simulations with AFWA scheme on 21 February 2015 and 14 February 2018 with the measured horizontal visibility were lower, 0.44 and 0.50, respectively. Modern-Era Retrospective analysis for Research and Applications, version 2 (MERRA2) re-analysis data also showed timing of peak dust levels consistent with the GOCART scheme.

FINANCIAL AND ECONOMIC SECURITY OF UKRAINE'S COMMERCIAL BANKS: THREATS AND PREVENTION MEASURES

Being the blood artery of any country's national economy, the banking system, as an aggregate of various types of national banks and credit institutions operating under the general monetary mechanism, is constantly threatened by the negative effects of a number of factors, both external and internal origin. Banking customers, competitors, the state, criminal groups, foreign structures and entities, as well as the legal, general economic, socio-political, scientific and technical and natural environment, have an external influence. The sources of banking system threats are also internal systemic factors, including the imperfection of banking supervision and regulation, the application of methods of unfair competition of competing banks, the development of mergers and acquisitions of banks, as well as the falsity, irrationality, imperfection of the internal environment. The essence of the concepts of security of a commercial bank and security of a commercial bank are considered and the author's vision of understanding the essence of the concept of and economic security of a commercial bank is proposed. Special attention is paid to the differentiation of financial and economic security threats to which commercial banks are exposed, performing their specific functions and acting as direct subjects of economic and financial relations. The dynamics of actual and characteristic values of indicators, which are the main indicators of financial and economic security of commercial banks, are demonstrated. On this basis, a set of priority measures aimed at preventing internal and external threats to the investigated security of Ukrainian commercial banks is proposed. The results of the conducted research prove the urgency of the problem of ensuring the financial and economic security of commercial banks, that is, preventing the probable or overcoming existing threats, both external and internal. The success of overcoming this problem depends to a large extent on the correct understanding of the concept of and economic security of the bank and the specific features of banking activities, which, in fact, create an extremely wide range of threats. Vulnerable to the negative impact of various events and phenomena inherent in both the world and domestic economies, commercial banks of Ukraine need a comprehensive solution to the issue of protection against threats to their security in general and financial and economic, in particular. The proposed set of identified measures requires a well-thought-out approach to their implementation through a well-formed mechanism, which is the object of further scientific exploration.

The internal origin of the west-east asymmetry of Antarctic climate change.

Recent Antarctic surface climate change has been characterized by greater warming trends in West Antarctica than in East Antarctica. Although this asymmetric feature is well recognized, its origin remains poorly understood. Here, by analyzing observation data and multimodel results, we show that a west-east asymmetric internal mode amplified in austral winter originates from the harmony of the atmosphere-ocean coupled feedback off West Antarctica and the Antarctic terrain. The warmer ocean temperature over the West Antarctic sector has positive feedback, with an anomalous upper-tropospheric anticyclonic circulation response centered over West Antarctica, in which the strength of the feedback is controlled by the Antarctic topographic layout and the annual cycle. The current west-east asymmetry of Antarctic surface climate change is undoubtedly of natural origin because no external factors (e.g., orbital or anthropogenic factors) contribute to the asymmetric mode.

Value of Dyna CT in guiding embolization during transarterial uterine artery embolization of fibroids.

The present study aimed to assess the usefulness of Dyna CT during transarterial uterine artery embolization (UAE) of fibroids. A total of 65 patients with symptomatic submucosal and intramural fibroids scheduled for transarterial UAE at the First People's Hospital of Changhou between May 2016 and September 2018 were included. Dyna CT and routine digital subtraction angiography (DSA) were performed in all patients during angiographic embolization of the bilateral internal iliac arteries. The visualization qualities of uterine artery origin and fibroids, as imaged by Dyna CT, were compared with DSA anterior-posterior images. Dyna CT provided excellent 3-dimensional visualization of vascular structures of the bilateral internal iliac arteries and uterine artery origin. Dyna CT was primarily useful in patients with overlapped uterine arteries or complex vascular anatomies on DSA anterior-posterior images (Dyna CT 100% vs. DSA anterior-posterior 69.2%, P=0.03). However, stained fibroids were identified in 57/65 cases (87.7%) by Dyna CT, and in all of the cases (100%) by DSA anterior-posterior imaging (P=0.03). Dyna CT is not suitable for procedural evaluation when used alone for transarterial UAE of fibroids. However, Dyna CT is an excellent supplement to DSA anterior-posterior imaging, as it provides additional information to aid in treatment planning.

Therapeutic management of isolated internal iliac artery aneurysms

ObjectiveIsolated internal iliac artery aneurysms (IIIAAs) are rare, life-threatening entities for which the optimal treatment strategy has not been established. This study aimed to evaluate the outcomes of open and endovascular treatment of IIIAAs. MethodsIIIAA cases between January 2009 and March 2019 at two hospitals were retrospectively reviewed. Demographic, clinical, ancillary testing, treatment, and outcome data were collected and analyzed. ResultsForty-two patients (37 men and 5 women) with a mean age of 71 years were included. Twenty-five patients (60%) had a history of hypertension. Twenty-two patients (52%) were asymptomatic, and 16 (38%) presented with abdominal pain (12 with ruptured aneurysms). The 42 included patients had 43 treated IIIAAs. The following surgical techniques were used: surgical resection (n = 6), endovascular coil embolization (n = 12), endovascular stent graft placement across the internal iliac artery origin (n = 8 with 9 aneurysms), and combined coil embolization and stent graft placement (n = 16). The immediate technical success rate was 67%, 67%, and 88% for embolization, stent graft placement, and combined method, respectively. Open surgery was associated with the longest operative time and hospital stay. Overall 30-day mortality was 5% for all patients and 17% for patients with ruptured IIIAAs. Buttock claudication occurred in 7 of 40 patients who survived (18%). The median follow-up time was 56 months. The combined approach was associated with the lowest rates of endoleak (6% vs 25% and 29%) and reintervention (6% vs 17% and 29%) of the three endovascular methods. ConclusionsEndovascular coil embolization with stent graft placement is a feasible, safe, and effective treatment approach for large IIIAAs without adequate aneurysm necks.

On the impact of socioeconomic policy upon national security (based on the example of Turkish currency and debt crisis of 2018)

This article is dedicated to examination of the impact of social factors upon the state of national economic security, which is a vital segment within the overall system of national security. Insurance of national economic security implies activities aimed at elimination of factors that negatively affect the development and independence of the national economy. Such factors, of internal or external origin, are views as threats to national economic security. The subject of this research is internal threats that emerged as a result of unfavorable socioeconomic policy of the state. The author describes the impact of Turkish socioeconomic policy upon the state of its economic security by means of establishing a causal connection between certain manifestations of the unfavorable socioeconomic policy of the country and the emergence of threats to national economic security. The scientific novelty consists in definition of socioeconomic policy of the state as a factor affecting both, economic and national security. This hypothesis is substantiated by the following conclusions: 1) Effectiveness of socioeconomic policy of the state depends on differentiation of the distribution of benefits in the course of its realization; serving the interests of particular population group results in destabilization of the society and risks of civil confrontation, which leads to negative consequences for the national economy and adversely affects the state of national economic security. 2) Excessive burden on state budget with social and economic expenditures may negatively affect the state of national economy in the conditions of upcoming macroeconomic cataclysms. This is what happened in Turkey, when a substantial part of state budget dragged national economy to the bottom in terms of the United States economic sanctions and subsequent crisis of 2018.

MULTILATERALITY OF UKRAINE'S SOCIAL SECURITY SYSTEM

Introduction. Ensuring social security at the level of an individual, society or state is a central concept of activity of all branches of government in Ukraine, as it is a guarantee of public perception of the activities of public institutions and successful implementation of reforms. The lack of stability in Ukrainian society is particularly relevant to the task of ensuring multi-level social security and encourages the deepening and development of organizational and managerial principles of its regulation. Methods. The dialectical method of scientific cognition, complex, systematic, logical approaches, as well as a sociological survey were used to identify the state, problems and directions of providing social security, the sample size of which was 2515 respondents in 110 settlements of Ukraine, statistical error (probability 0,95, design effect 1,5) did not exceed 3,2% for metrics close to 50% and not less than 0,7% for metrics close to 1% and 99%. Results. Based on the hierarchy of the construction and functioning of social systems, there is reason to argue that the social security system is a complex multilevel system, which is formed and operates in the plane of objective and subjective processes from the influence of many factors of internal and external origin. A high level of social security is achieved by creating favourable conditions for ensuring a sufficient standard of living for the population and is characterized by the size of real incomes and the volume of economic benefits. Social security management is a purposeful activity of social security entities that develop and implement governmental, regulatory, coordinating, controlling, regulatory and organizational-managerial influences on social security objects for the purpose of forecasting, timely detection, prevention and neutralizing threats. Discussion. Further research should be carried out in the direction of developing the scientific basis of state regulation of social security, aimed at timely response to and elimination of social threats, formation of targeted mechanisms for achieving social security, coordination and interaction of authorities. Keywords: social progress, public administration, social security system, national security, social risks, social and economic interests.

It is time to retire Goodsall's Rule: the Midline Rule is a more accurate predictor of the true and natural course of anal fistulas.

On May 6, 1887 at a meeting of the West London Medico-Chirurgical Society, original observations attributed to D. H. Goodsall described an association between the secondary (external) sinus opening and the location of the primary (internal) opening of an anal fistula: posterior external sinuses had a midline origin and anterior external sinuses took a straight path to their internal origin-eponymously known as Goodsall's Rule. However, over the last century, published reports support the midline as the primary (internal) origin of all anal fistulas, thus challenging the predictive accuracy of Goodsall's Rule and prompting this expansive review. A literature search was performed for studies describing the relationship between the secondary (external) opening and the primary (internal) opening of anal fistulas, including recent reports of the positive predictive value (PPV) of Goodsall's Rule. The studies were evaluated to determine the validity of Goodsall's observations. The midline was the dominant, primary (internal) opening site of all anal fistulas with up to 95% accuracy. Goodsall's Rule was inaccurate when applied to anal fistulas with an anterior off-midline external sinus opening which tend to mirror posterior off-midline external sinuses and curve to a midline origin, rather than take a straight course to a primary (internal) opening, as predicted by Goodsall. Use of the Midline Rule had superior predictive accuracy, reflected in an increase in overall PPV of the location of the primary (internal) origin from 49% using Goodsall's Rule to 71% using the Midline Rule (57-62% for men, 31-90% for women). Goodsall's Rule falls short in predicting the natural course of anal fistulas with an anterior off-midline external sinus opening, especially for women. Given the increased risk of fecal incontinence related to surgical intervention for anterior-based anal fistulas, especially in women, dependence on Goodsall's Rule to guide the surgeon may result in "disastrous consequences". The preponderance of evidence over the last century favors the Midline Rule as a more accurate predictor of the true and natural course of anal fistulas, regardless of the location of the external sinus opening.

Unusual case of primary cutaneous signet-ring cell (histocytoid) carcinoma

Signet-ring cell (histocytoid) carcinoma is a rare and aggressive skin neoplasm that most commonly affects elderly men. It typically originates from the upper or lower eyelid, with bilateral involvement only in rare cases, and results in a diffuse and infiltrative appearance clinically, radiologically, and histologically (the "monocle" sign). It is essential to carry out a full investigation to rule out metastasis from an internal origin.

Formation and suppression of nonthermal statistics in peridically driven quantum Ising models

In classic statistical physics, an isolated system corresponds to a constant energy shell in the phase space, which can be described by the microcanonical ensemble. While, for an isolated quantum system, the conventional treatment is to subject the system to a narrow energy window in the Hilbert space instead of the energy shell in classical phase space, and then confine the participating eigen states of system wave function in the narrow window, so that the microcanonical ensemble can be recovered in the framework of quantum mechanics. Apart from the traditional theory, there is a more self-consistent description for the isolated quantum system, that is, the quantum microcanonical (QMC) ensemble. The QMC ensemble abandons the narrow energy window assumption, and allows all the eigen states to contribute to the system wave function on condition that the system average energy is fixed at a given value. At the same time, the total occupation probability of these eigen states is conserved to unity. The most probable probability distribution obtained in the Hilbert space for an isolated quantum system according to the constraints specified above is called the QMC statistics. There is a clear difference between the QMC distribution and the traditional Gibbs distribution having an exponential form. Through the external periodic drives, an isolated quantum system may produce the QMC distribution, which is a consequence of the interplay between internal origins and external drives. In this paper, we investigate the conditions for the formation and suppression of QMC distribution by using the exact diagonalization method based on the one-dimensional Ising model. We start with the one-dimensional Ising model and focus on three different cases of periodic drives: systems under vertical (along the <i>z</i> axis), horizontal (along the <i>x</i> axis), horizontal magnetic field together with random internal (along the <i>y</i> axis) magnetic field. For all these three cases, the external magnetic fields are set to be ordinary rectangular pulses and the Gibbs distributions are taken as the initial states. We then study the evolutions and their asymptotic tendencies to the QMC distributions of the eigen state occupation probability under the effect of external periodic magnetic field. The results show that under the vertical magnetic field, the eigen state occupation probability does not change, and the system cannot produce the QMC distribution; under the horizontal magnetic field, the system tends to display a QMC distribution, but only partly; under horizontal and random internal magnetic fields at the same time, the transition to QMC distribution can be fully realized, and finally the system is almost completely thermalized. In order to clarify the different behaviors of the Ising model in the three cases, we also calculate the information entropy of the eigen state of Floquet operator in the eigen representation of the unperturbed Hamiltonian. We find that as the information entropy of the Floquet eigen state increases, the convergence to the QMC distribution in the Hilbert space is improved. We also notice that the mechanism for the emergence of QMC distribution is closely related to the thermalization effect of the isolated quantum system. Our analyses show that when the magnetic field is vertical, it cannot trigger the thermalization of the system. When the magnetic field is horizontal, the system becomes partly, but not completely, thermalized. When we add a horizontal periodic magnetic field and a random internal magnetic field at the same time, the system can be completely thermalized to infinite temperature. Thus, the asymptotic behavior towards the QMC statistics is a reflection of the fact that the isolated quantum system is thermalizable under periodic drives.

The cone of acceptance and magnetic rigidity cutoff of galactic cosmic ray particles for different models of the International Geomagnetic Reference Field from 1965-2015 in the Deblin airport, Poland

We present the results of computations of the trajectories (the asymptotic latitude and asymptotic longitude) and the magnetic cutoff rigidity of galactic cosmic ray (GCR) particles for the airport Deblin, Poland (geographical latitude 51°33′32′′ N, geographical longitude 21°50′53′′ E) based on the numerical integration of equations of motion of charged particles of cosmic rays in the Earth’s magnetic field. The set of allowed trajectories at a given site on the surface of the Earth is called the asymptotic cone of acceptance The initial distance from the center of the Earth was taken to be 20 km above the Earth’s surface. At about this altitude, most cosmic rays undergo nuclear collisions. Calculations were made for different of models of the International Geomagnetic Reference Field (IGRF) from 1965–2015. The IGRF is an internationally agreed and widely used mathematical model of the Earth’s magnetic field of internal origin. Each constituent model of the IGRF is a set of spherical harmonics of degree n and order m, representing a solution to Laplace’s equation for the magnetic potential arising from sources inside the Earth at a given epoch. In all asymptotic direction calculations, we used sixth-degree expansion of geomagnetic field model. Schmidt normalized spherical harmonic coefficients were taken for the epochs from 1965 to 2015. Knowledge of asymptotic directions and the magnetic rigidity cutoff is important from the point of view of study different classes of cosmic rays variations intensity and anisotropy.

Histocytological Study of Somatic Embryogenesis in the Tree Cinnamomum camphora L. (Lauraceae)

Histocytological studies were conducted on primary, secondary, and malformed embryos produced during somatic embryogenesis of Cinnamomum camphora L. to better understand its development. Exploring its callus types and structures provided a theoretical basis for clarifying the mechanism of somatic embryogenesis, which may shed light on the mechanism of zygotic embryogenesis. We used immature zygotic embryos as explants to induce somatic embryos, forming many embryogenic calli that differentiated into mature somatic embryos. Our results showed that somatic embryogenesis of C. camphora was similar to that of zygotic embryos. We have been dedifferentiated four types of callus. Compared with non-embryogenic cells, embryogenic cells had a closer arrangement, larger nucleus, thicker cytoplasm, more starch granules and easier to stain into black. Somatic embryogenesis had two pathways: direct (predominate) and indirect (rare). Embryogenic cells of C. camphora could have either an internal or external origin, the latter being primary, for which occurrence sites include epidermis and near-epidermis (little internally). Mostly arising from single cells, C. camphora follows two developmental pathways: single-cell equal as opposed to unequal, wherein both divide to form multi-cell proembryos. However, multicellular origins can occasionally occur and feature physiological isolation during somatic embryo development. This development has four embryo stages: globular, heart-shaped, torpedo, and cotyledon, with procambium cells apparent in globular embryos and late cotyledons forming “Y-shaped” vascular bundles. Secondary embryos were present in all stages, directly occurring on primary embryo’s germ and radicle end surfaces. We conclude that secondary and primary embryos of C. camphora undergo similar developmental processes. At the same time, conjoined cotyledon embryos and morphological abnormal embryos were found, with an internal origin more likely to generate abnormal embryos.
 
 *********
 In press - Online First. Article has been peer reviewed, accepted for publication and published online without pagination. It will receive pagination when the issue will be ready for publishing as a complete number (Volume 47, Issue 4, 2019). The article is searchable and citable by Digital Object Identifier (DOI). DOI link will become active after the article will be included in the complete issue.
 *********

The treatment of animals in the Slavs in old times

The mythology and social history of the Slavs, as well as the messages left by the ancient Greek and Roman authors, is the basis on which you can approximate the picture of animal treatment in ancient Slavs. These messages also include the beginning of animal treatment in Ukraine, because as a Slavic people we are part of the historical and cultural life of all Slavs. Due to the fact that the development of human or animal medicine in all nations has the same course, and that in the period of development of civilization of this people and medicine there has been similar progress, therefore, the development of animal treatment in the Slavs had a similar form. In general, more diseases were caused by external factors, and especially in surgical cases, such as wounds, arrow penetration. Data on the occurrence of diseases due to parasites or poisons – this is the main cause of diseases of internal origin by external factors, the so-called theory of foreign bodies. The causes of all diseases in the beginning were of natural origin, so they were tried to cure with the help of the simplest natural treatment. With the further spiritual development of the Slavs and the emergence of the first religious beliefs, joining the natural causes of the disease is still a religious element, but without rejecting the main factor. The most ancient religious belief of the Slavs was the belief in the ancestral spirits, the so-called “animism”. For the reasons described above, attempts have been made to prevent pet illnesses by providing the spirits or the above-ground creatures with evidence of memory by making sacrifices. When an animal fell ill and was suspected of being out of spirit, humans tried to reassure him with sacrifices or spells. On the other hand, good and evil spirits have been endeavored to receive help from good spirits against evil ones. Religious treatment, however, did not rule out the simplest healing procedures. In addition to religious activity, priests in the Slavs were treating both humans and animals. They were called “priests”. Among them were doctors and magi. Natural remedies were not sufficient for a primary understanding of the treatment of a patient or wound, therefore, the “doctor”, using primitive and simple methods of treatment, to increase their actions over patients or wounds, conspired loudly to the disease. The Magi did just not loudly, but in a whisper. However, little information in the field of medicine in the Slavs tells us a great deal. This is evidence that in ancient times the treatment was developed in ancient Slavs. At that time, the Slavs were already well aware of the danger of sap, or swelling of the salivary glands, and tried to prevent this through surgery. Due to the fact that the Slavs did not show great differences in culture at that time, the way of treating animals in all Slavs was common. Like every primitive nation, so did the Slavs, with the exception of the priests, the animals were treated by men engaged in the elderly, who, through their long lives, innate abilities and experience, have learned certain treatments, and have studied the medicinal value of herbs and other remedies, used during treatment. Subsequently, the treatment of certain species of animals goes to the people who have the greatest contact with the animals, and therefore it is shepherds, sheep farmers, keepers of dogs, poultries. Medicines were home-made herbs, then various animal products, of which today we can count part of the so-called pharmacy, then minerals and finally various magical procedures such as conspiracy.

Investigate the Frequency Spectrum of Noise Signals Affecting Synchronous Signals of fMRI and fNIRS in Resting and Moving Wrists

Purpose: The nerve signals are often contaminated by the non-nerve signals in the same frequency range, i.e. low frequencies in the range of 0.1 Hz. Among the different medical imaging tools, Functional Magnetic Resonance Imaging (fMRI) has been widely used by scientists and scholars due to its high spatial resolution for brain mapping. Materials and Methods: Also, the use of Functional Near-Infrared Spectroscopy (NFIRS) has continued to rise and regarding its high temporal resolution, it is considered as the complement of FMRI. Results: However, the effect of non-nerve functions is observed in both methods. Specially, by showing that non-nervous Low Frequency Oscillations (LFOs) 1) are merely non-nervous, because they can be measured by the environmental NIRS; 2) their internal origin is close to the heart; 3) in comparison with the available LF models based on respiration and the merely non-nervous changes in heart, they are unique in their spatial and temporal features, it seems that the systemic signals are moving through the cerebral arteries. Conclusion: In this paper, LF Oscillations (LFOs) are compared with simultaneous NIRS/FMRI. Also, we discuss the non-neurological effects during simple motions of the wrist in FMRI showing that a significant portion of them, especially in motion state networks, are non-nerve and we measure the sensitivity of NIRS to non-neural LFOs through mapping of nerve and non-nerve LFOs with an extra high spatial and temporal resolution

Retrieving lithospheric magnetisation distribution from magnetic field models

Summary We investigate to which extent the radially averaged magnetisation of the lithosphere can be recovered from the information content of a spherical harmonic model of the generated magnetic field when combined with few simple hypotheses. The results obtained show firstly that a hypothesis of magnetisation induced by a field of internal origin, even over a localised area, is not sufficient to recover uniquely the radially averaged magnetisation and, secondly, that this magnetisation can be recovered when a constant magnetisation direction is assumed. An algorithm to recover the magnetisation direction and distribution is then described and tested over a synthetic example. It requires to introduce a cost function that vanishes when estimated in a system of coordinates with its Z axis aligned with the magnetisation direction. Failing to find a vanishingly small value for the cost function is an indication that a constant magnetisation direction is not a valid hypothesis for the studied magnetic field model. The range of magnetisation directions that are compatible with the magnetic field model and a given noise level, can also be estimated. The whole process is illustrated by analysing a local, isolated maximum of the Martian magnetic field.

Управління функціональною стійкістю інформаційних систем на основі оптимізації видатків на захист

The resources of the protection systems are usually directed at external causes of dysfunctional states, so the specific danger from internal causes may suddenly become much greater, since the information system (IC) is completely open to them. Up to 40% of the hacks of banking IP were due to the actions of insiders, that is, employees who acted consciously or unconsciously. On the other hand, more than 300 mobile applications distributed through official stores contain malicious code. 71% of attacks remain undetected. Cybernetic attacks on the IP of the security agencies ofUkraine, in particular the Ministry of Defense ofUkraine, the IP of state bodies and objects of critical infrastructure, are constantly goingThis makes it urgent to develop means to counter dysfunctional states of IP, regardless of the reasons for the origin of these states. While ensuring the functional stability of the information system, it is relevant to extend the concept of countering cyber attacks (IS incidents) of external origin to the concept of countering dysfunctional states of IP of both external and internal origin. For dysfunctional states of internal and external origin, in most cases the mathematical formalization is similar.The purpose of the article is to increase the level of protection of network information systems from dysfunctional states due to the development of a method for managing the functional stability of information systems based on optimization of protection costs.When solving problems of increasing the level of security of network information systems, it is advisable to expand the concept of computer attacks to the concept of dysfunctional states, including malicious and unintended causes of incidents.It is advisable to replace the basic exponential dependence of losses on dysfunctional states depending on the amount of protection costs by a more adequate S-shaped logistic one.The level of losses essentially depends on the degree of criticality of information resources for a certain type of organization, which is expedient to measure by the amount of net losses directly from dysfunctional states without taking into account losses from consequences and the costs of eliminating consequences.

The EDGE-CALIFA Survey: Evidence for Pervasive Extraplanar Diffuse Ionized Gas in Nearby Edge-on Galaxies

Abstract We investigate the prevalence, properties, and kinematics of extraplanar diffuse ionized gas (eDIG) in a sample of 25 edge-on galaxies selected from the CALIFA survey. We measure ionized gas scale heights from Hα and find that 90% have measurable scale heights with a median of kpc. From the Hα kinematics, we find that 60% of galaxies show a decrease in the rotation velocity as a function of height above the midplane. This lag is characteristic of eDIG, and we measure a median lag of 21 km s−1 kpc−1, which is comparable to lags measured in the literature. We also investigate variations in the lag with radius. H i lags have been reported to systematically decrease with galactocentric radius. We find both increasing and decreasing ionized gas lags with radius, as well as a large number of galaxies consistent with no radial lag variation, and investigate these results in the context of internal and external origins for the lagging ionized gas. We confirm that the [S ii]/Hα and [N ii]/Hα line ratios increase with height above the midplane as is characteristic of eDIG. The ionization of the eDIG is dominated by star-forming complexes (leaky H ii regions). We conclude that the lagging ionized gas is turbulent ejected gas likely resulting from star formation activity in the disk as opposed to gas in the stellar thick disk or bulge. This is further evidence for the eDIG being a product of stellar feedback and for the pervasiveness of this WIM-like phase in many local star-forming galaxies.

Correlated Time‐Varying Magnetic Fields and the Core Size of Mercury

AbstractMercury is characterized by a very peculiar magnetic field, as it was revealed by the MESSENGER mission. Its internal component is highly axisymmetric, dominated by the dipole, and very weak. This in turns leads to a very dynamic magnetosphere. It is known that there exist relationships between the internally generated field and the external field, although their dynamics are complex. In this study we derive steady and time‐varying spherical harmonic models of Mercury's magnetic field using MESSENGER measurements and interpret these models both in terms of correlated features and of the internal structure of Mercury. The influence of the hemispheric data distribution of MESSENGER is evaluated to grant the robustness of our models. We find a quadrupole‐to‐dipole ratio of 0.27 for the steady magnetic field. The time‐varying models reveal periodic and highly correlated temporal variations of internal and external origins. This argues for externally inducing and internally induced sources. The main period is 88 days, the orbital period of Mercury around the Sun. There is no measurable time lag between variations of external and internal magnetic fields, which place an upper limit of 1 S/m for the mantle conductivity. Finally, the compared amplitudes of external and internal time‐varying field lead to an independent (from gravity studies) estimate of the conductive core radius, at 2,060 ± 22 km. These analyses will be further completed with the upcoming BepiColombo mission and its magnetic field experiment, but the presented results already lift the veil on some of the magnetic oddities at Mercury.

Telomere DNA length-dependent regulation of DNA replication timing at internal late replication origins

DNA replication is initiated at replication origins on chromosomes at their scheduled time during S phase of the cell cycle. Replication timing control is highly conserved among eukaryotes but the underlying mechanisms are not fully understood. Recent studies have revealed that some telomere-binding proteins regulate replication timing at late-replicating origins throughout the genome. To investigate the molecular basis of this process, we analyzed the effects of excessive elongation of telomere DNA on replication timing by deleting telomere-associated shelterin proteins in Schizosaccharomyces pombe. We found that rap1∆ and poz1∆ cells showed abnormally accelerated replication at internal late origins but not at subtelomere regions. These defects were suppressed by removal of telomere DNA and by deletion of the telomere-binding protein Taz1. Furthermore, Sds21—a counter protein phosphatase against Dbf4-dependent kinase (DDK)—accumulated at elongated telomeres in a Taz1-dependent manner but was depleted at internal late origins, indicating that highly elongated telomeres sequester Sds21 at telomeres and perturb replication timing at internal regions. These results demonstrate that telomere DNA length is an important determinant of replication timing at internal regions of chromosomes in eukaryotes.