Body Of Material Research Articles

The Esquinzo Ultra-Alkaline Rock Suite of Fuerteventura Basal Complex (Canary Islands): Evidence for Origin of Carbonatites by Fractional Crystallization

The origin of the carbonatites that appear on Earth is one of the most controversial current topics in the petrogenesis of igneous rocks. Situated in the northern sector of the Basal Complex of Fuerteventura (Canary Islands), the Miocene Esquinzo ultra-alkaline plutonic rock complex is composed of pyroxenites, melteigites-ijolites-urtites, malignites-nepheline syenites, carbonatites, silicocarbonatites, nephelinites and nepheline phonolites. This work tries to establish the genesis of this massif of ultra-alkaline rocks with associated carbonatites from Fuerteventura (which are very rare in the oceans). The geochemical characteristics of these rocks and the minerals that are included in them have allowed us to establish their origin. This complex was generated by three successive magmatic events associated with differentiation of melanephelinite magmas emplaced in the oceanic crust. Silicocarbonatite and calciocarbonatite (sövites) dykes are related to the first magmatic event and were formed by fractional crystallization of H2O- and CO2-rich ijolite magmas. The melanephelinite magmas that formed these plutonic ultra-alkaline rocks were apparently generated as partial melts of asthenospheric mantle, which assimilated enriched lithospheric mantle material as they ascended. The upwelling of this large body of anomalous asthenospheric Miocene material exceeded the deformation associated with plate motions and led to an oceanic rifting event in Fuerteventura.

Dulong-Petit’s law and Boltzmann’s theoretical proof from the Kinetic Theory of Gases

The main aspect that we will address in this work is the introductory presentation of the empirical law of the specific heats of material bodies, published by Dulong and Petit on April 12, 1819, in the magazine Comptes Rendus. The analytical demonstration of this law appeared for the first time in 1866 in the Doctoral Thesis of the Austrian physicist Ludwig Boltzmann, according to the research carried out by Cássio C. Laranjeiras and presented in his Doctoral Thesis in 2002. In the introduction we discussed how Dulong’s law and Petit played a key role in the subsequent development of a new physics (Quantum Mechanics), when Max Planck changed his research program from electrodynamics to thermodynamics, evidenced in the book: Black Body Theory and the Quantum Discontinuity, 1894-1912, published by Thomas Khun in 1978. Between 1900 and 1912, we observed that fundamental works published by Albert Einstein, Henri Poincaré and Peter Debye explained the mathematical relationship of this empirical law based on Planck’s hypothesis of the quantum of action of blackbody radiation. Despite the controversy over the authorship of the law, whether it would have been formulated in advance by Arago, we agree with Robert Fox that it was the results of Dulong and Petit’s experiments that led to the formulation of the law.

Recent progress in the application of biodegradable metal implants

With the accumulation of data, magnesium-based degradable metal, iron-based degradable metal and zinc-based degradable metal implantable interventional devices have entered the clinic or carried out human experimental studies, and the future prospects are promising. In this paper, the definition, biodegradability and biocompatibility criteria and their classification are reviewed, and the research status and unsolved scientific problems of magnesium-based degradable metals, iron-based degradable metals and zinc-based degradable metals are introduced, and the future development opportunities and challenges of degradable metals are prospected. With a deeper understanding of scientific issues such as mechanical adaptation, degradation adaptation and tissue adaptation of degradable metal implants, more new materials, new technologies and new methods of degradable metals will be developed in the future, so as to effectively realize the precise adaptation of the two events of degradable metal material degradation and body tissue repair in time and geometric space.

After a Century of Revolution in the Status of Space and Time: Einstein’s Train Revisited

After a Century of Revolution in the Status of Space and Time: Einstein’s Train Revisited

Finite element solution of crack-tip fields for an elastic porous solid with density-dependent material moduli and preferential stiffness

In this paper, the finite element solutions of crack-tip fields for an elastic porous solid with density-dependent material moduli are presented. Unlike the classical linearized case in which material parameters are globally constant under a small strain regime, the stiffness of the model presented in this paper can depend upon the density with a modeling parameter. The proposed constitutive relationship appears linear in the Cauchy stress and linearized strain independently. From a subclass of the implicit constitutive relation, the governing equation is bestowed via the balance of linear momentum, resulting in a quasi-linear partial differential equation (PDE) system. Using the classical damped Newton’s method, the sequence of linear problems is then obtained, and the linear PDEs are discretized through a bilinear continuous Galerkin-type finite element method. We perform a series of numerical simulations for material bodies with a single edge-crack subject to a variety of loading types (i.e. the pure mode-I, II, and mixed-mode). Numerical solutions demonstrate that the modeling parameter in our proposed model can control preferential mechanical stiffness with its sign and magnitude along with the change of volumetric strain. This study can provide a mathematical and computational foundation to further model the quasi-static and dynamic evolution of cracks, utilizing the density-dependent moduli model and its modeling framework.

Beyond body and mind: psychology and the unity of the human person in Aquinas

Abstract Human persons are at once simple and complex: simple, because they possess a unified and indivisible essence in the form of the soul; and, complex, since this immaterial soul is conjoined to a material body, accounting for the human whole. This paper highlights the nature of this union and explores the psychology of the human person based on Thomistic philosophical tradition. Our thesis is that Aquinas’s hylomorphism, which counters in advance the claims of Descartes on human identity, offers a comprehensive understanding of the human person and provides a robust foundation that understands the human person as transcending the limitations of body and mind, and this has implications for philosophical, psychological and scientific enquiries.

A bulk-surface continuum theory for fluid flows and phase segregation with finite surface thickness

In this continuum theory, we propose a mathematical framework to study the mechanical interplay of bulk-surface materials undergoing deformation and phase segregation. To this end, we devise a principle of virtual powers with a bulk-surface dynamics, which is postulated on a material body P where the boundary ∂P may lose smoothness, that is, the normal field may be discontinuous on an edge ∂2P. The final set of equations somewhat resemble the Navier–Stokes–Cahn–Hilliard equation for the bulk and the surface. Aside from the systematical treatment based on a specialized version of the virtual power principle and free-energy imbalances for bulk-surface theories, we consider two additional ingredients: an explicit dependency of the apparent surface density on the surface thickness and mixed boundary conditions for the velocity, chemical potential, and microstructure.

Development of real-time navigation system for laparoscopic hepatectomy using magnetic micro sensor

Background We report a new real-time navigation system for laparoscopic hepatectomy (LH), which resembles a car navigation system. Material and methods Virtual three-dimensional liver and body images were reconstructed using the “New-VES” system, which worked as roadmap during surgery. Several points of the patient’s body were registered in virtual images using a magnetic position sensor (MPS). A magnetic transmitter, corresponding to an artificial satellite, was placed about 40 cm above the patient’s body. Another MPS, corresponding to a GPS antenna, was fixed on the handling part of the laparoscope. Fiducial registration error (FRE, an error between real and virtual lengths) was utilized to evaluate the accuracy of this system. Results Twenty-one patients underwent LH with this system. Mean FRE of the initial five patients was 17.7 mm. Mean FRE of eight patients in whom MDCT was taken using radiological markers for registration of body parts as first improvement, was reduced to 10.2 mm (p = .014). As second improvement, a new MPS as an intraoperative body position sensor was fixed on the right-sided chest wall for automatic correction of postural gap. The preoperative and postoperative mean FREs of 8 patients with both improvements were 11.1 mm and 10.1 mm (p = .250). Conclusions Our system may provide a promising option that virtually guides LH.

No correlation to collagen synthesis disorders in patients with Perthes’ disease: a nationwide Swedish register study of 3488 patients

BackgroundMutations of the COL2A1 gene have been identified in patients with Perthes’ disease. Several studies have hypothesised a connection between Perthes’ disease and collagen synthesis disorders, especially COL2A1-related disorders, but no large studies on the subject have been made. The aim of this study was thus to discover if there is a connection between patients presenting with Perthes’ disease, and collagen synthesis disorders. A secondary aim was to see if the children with both disorders had less optimal birth characteristics than the rest.MethodsSwedish national registers were used to collect data on children diagnosed with Perthes’ disease or a collagen synthesis disorder. These registers include all births in Sweden, and data from both outpatient and in-hospital visits. A wide range of data is included besides diagnoses. All children with follow-up data to the age of 15 years were included. Pearson’s chi-square was used for analysis. Statistical significance was further analysed with Fisher’s Exact Test.ResultsIn total, 3488 children with either diagnosis were included. 1620 children had only Perthes disease, while 1808 children had only a collagen synthesis disorder. Five children were found to have both the diagnosis Perthes’ disease and a collagen synthesis disorder. One child was large for their gestational age and none of the children had a low birthweight. Two of the children were moderately preterm.ConclusionsThe distinct lack of overlap in such a large body of material raises doubt about a connection between the presentation of Perthes’ disease and collagen synthesis disorders, either COL2A1-related or not. We could not find an overrepresentation of less optimal birth characteristics either.

The Islamic effect: Exploring the dynamics of Islamic events on sustainable performance of Islamic and conventional stock markets

This study attempts to investigate the effects of Islamic events on both Islamic and conventional stock markets and analyze which market reacts more pronouncedly to these events. From 2012 to 2022, the research used daily stock return data from eight nations: Kuwait, India, Nigeria, Malaysia, Pakistan, Qatar, Saudi Arabia, and the United Arab Emirates. The study examines how Islamic holidays such as Ashura, Eid Meelad ul Nabi, Eid ul Azha, and Ramadan affect both Islamic and Western stock markets. The researchers use the Generalized Autoregressive Conditional Heteroscedastic (GARCH) model to analyze the data. The results of this analysis show that Islamic events in India, Nigeria, Malaysia, Pakistan, and Qatar have a strong and favorable link with Islamic stock returns. However, it was discovered that there is a little correlation between Islamic events and Islamic stock returns in the remaining three nations. The study also reveals a strong and favorable correlation between Islamic events and conventional stock performance in all countries. By offering a comparative analysis of the effect of Islamic events on Islamic stock markets and mainstream stock markets, these findings add to the body of current material. Every religion has its own set of rituals that its adherents observe, and these rituals frequently have an impact on different economic and non-economic activities. This study sheds light on the precise connection between these events and stock market performance by examining the impact of Islamic occasions on both Islamic and conventional stock markets.

3D-printed microrobots for biomedical applications.

Microrobots, which can perform tasks in difficult-to-reach parts of the human body under their own or external power supply, are potential tools for biomedical applications, such as drug delivery, microsurgery, imaging and monitoring, tissue engineering, and sensors and actuators. Compared with traditional fabrication methods for microrobots, recent improvements in 3D printers enable them to print high-precision microrobots, breaking through the limitations of traditional micromanufacturing technologies that require high skills for operators and greatly shortening the design-to-production cycle. Here, this review first introduces typical 3D printing technologies used in microrobot manufacturing. Then, the structures of microrobots with different functions and application scenarios are discussed. Next, we summarize the materials (body materials, propulsion materials and intelligent materials) used in 3D microrobot manufacturing to complete body construction and realize biomedical applications (e.g., drug delivery, imaging and monitoring). Finally, the challenges and future prospects of 3D printed microrobots in biomedical applications are discussed in terms of materials, manufacturing and advancement.

ЖЕРДІҢ ТҰРАҚТЫ ГРАВИТАЦИЯЛЫҚ ӨРІСІНДЕГІ ДЕНЕНІҢҚОЗҒАЛЫСЫН КОМПЬЮТЕРЛІК БЕЙНЕЛЕУ

The paper analyzes computer visualization of the motion of a material point or body in a constant gravitational field. Using the MathCAD application program package, the trajectories of the body motion are constructed. Mechanical parameters of the obtained trajectories are analyzed by means of MathCAD package.A comparative analysis of physical parameters of trajectories obtained on the basis of qualitative analysis and by means of computer visualization has been carried out. Computer programs made with the help of MathCAD allowed to obtain the following results: the trajectories of thrown bodies at different angles to the horizon were drawn when their velocities were the same; the trajectories of motion of a thrown body at an angle to the horizon were found without taking into account air resistance and with taking into account viscosity of the medium; an animation of motion of a material point in two-dimensional space was created. At computer visualization a visual demonstration of internal interrelations of kinematic parameters of motion of a material point near the Earth was achieved. It is proved that the trajectories of body motion constructed with the help of computer visualization can be a method of rechecking the solution and answer of the problem on kinematics. Results of simulation modeling and regularities of body motion in two-dimensional space are presented.

Signorini problem as a variational limit of obstacle problems in nonlinear elasticity

<abstract><p>An energy functional for the obstacle problem in linear elasticity is obtained as a variational limit of nonlinear elastic energy functionals describing a material body subject to pure traction load under a unilateral constraint representing the rigid obstacle. There exist loads pushing the body against the obstacle, but unfit for the geometry of the whole system body-obstacle, so that the corresponding variational limit turns out to be different from the classical Signorini problem in linear elasticity. However, if the force field acting on the body fulfils an appropriate geometric admissibility condition, we can show coincidence of minima. The analysis developed here provides a rigorous variational justification of the Signorini problem in linear elasticity, together with an accurate analysis of the unilateral constraint.</p></abstract>

Alfred North Whitehead’s Relational Special

The greatest relevance of Alfred North Whitehead’s work, in my opinion, has to be related to the interpretation and understanding of the theory of relativity. Whitehead’s same philosophy as ‘meta-physics,’ or ‘pan-physics’ has to be considered a transition from a logico-mathematical philosophy to a physical philosophy, to a cosmological philosophy rooted in his interpretation of relativity. He understood motion as a structural series of temporal events, avoiding permanent material bodies and refuting any interpretation of four-dimensional space-time as a kind of eternal permanence.

A transnational regioscape in the making. The Baltic Sea in Christian Petzold’s Barbara and Ilze Burkovska-Jacobsen’s My Favorite War

The Baltic Sea has effectively separated the Scandinavian and Eastern European countries, especially in the period when this body of water constituted a part of the Iron Curtain and functioned for Scandinavians as an imaginary protective moat. From the East-Central European perspective, the Baltic Sea offered a hope of escape to freedom, encapsulated in the cinematic trope of the sea as a ‘blue boundary’, or a ‘horizon of hope’. But the Baltic Sea was also feared as a life-threatening border, as expressed in the trope of ‘Baltic noir’, a variation of the ‘Eastern noir’ trope (Mrozewicz 2018) – imagining the sea in nocturnal scenery as wild and under state control. The article discusses screen representations of the Baltic Sea understood as performative regioscaping practices (Chow 2021), offering insights into the memories and histories of human mobilities across the Baltic Sea beyond official narratives, as well as into the human relationship with the sea as both a cultural boundary and material body of water. As demonstrated by the analyzed film examples, Christian Petzold’s Barbara (2012, Germany) and Ilze Burkovska-Jacobsen’s My Favorite War (2020, Norway, Latvia), the Baltic Sea continues to be an important spatiotemporal node in the transnational re-telling of the region’s history and identity.

Schulz and Mourning. About the Writer’s Second Body

The paper addresses the problem of the mourning cult of Bruno Schulz. The presented approach is critical of its excess in the Schulzean biographical discourses as well as literary and artistic references to his life and work, but it is by no means provocative like that of Janusz Rudnicki, who in the 1990s mocked the “hagiographic” idiom of Jerzy Ficowski. Analyzing archive records and testimonies, the author attempts to reconstruct the circumstances of Schulz’s death in possibly the minutest details. Comparing contradictory pieces of information with the official version made popular by Ficowski, he shows how profoundly it has been marked by the unperformed work of mourning over Schulz and the Holocaust – both the failed work of Ficowski himself and of his postwar correspond- ents whose letters determined the form of The Regions of Great Heresy. Using the idiom of thanatology and taking the role of a necrographer rather than that of a Schulz specialist, the author supposes that the dynamic of loss in the case of Schulz reaches far beyond the act of the writer’s execution on the street to include also the posthumous annihilation of his corpse and grave. This particular kind of necroviolence, perhaps the most hateful from the vantage point of the Jewish tradition and the heritage of Western culture in general, which consists in removing the material remains of the deceased has been called by Holocaust scholars “necrocide.” The absence of material traces and the “mourning objects” that usually help to cure the semiotic crisis which is death makes writers and artists commemorate Schulz with lyrical and artistic epitaphs. Their function is to restore the bodily identity of the dead person by creating his other body, told about and imagined in effigie, existing not beside but instead of the missing “mourning object.” However, the expansion of those elegiac narratives, particularly those produced outside Poland, often results in unintended reductionism. As a human being, writer, and artist, Schulz has been reduced in them to an emblem of the Holocaust, while such obituaries ignore the history of his archive. The other, historical and material body of the writer consists of his manuscripts, drawings, graphic works, and official documents. It exists, drawn and quartered, in archives, to be put up for auction for tens of thousands of dollars, exposed in museums and art galleries, and hoarded by collectors as precious relics.

Философское осмысление связи движения и взаимного положения материи как условия обратимости их изменений

The fact of existence of the limit of divisibility of matter, established earlier by the author, has an inevitable con-sequence of permanent loss by interacting matter of its motion. Since “heat death” due to this loss of motion has not occurred, therefore, there is a law providing restoration of motion. This law is the law of motion-position of matter. As an analog of the law of motion-position of matter, the article considers the law of conservation of mechanical energy, according to which kinetic energy (reflecting the motion of matter) can be reversibly trans-formed into potential energy (reflecting the mutual position of matter). The fundamental incompatibility of, on the one hand, the law of conservation of energy, corresponding to the relative description of being, and, on the other hand, the fact that motion is not irretrievably lost, corresponding to the absolute description of being close to absolute, is stated. The law of motion-position of matter in the assumption of birth of motion in the state of the greatest convergence of matter agrees with the existing cosmological ideas about the Big Bang and expan-sion of the Universe. The Universe in this case can be represented as an “energy independent” system. As the main problem, the study examines the determination of the mechanism of the growth of the velocity of material structures. The probable sought mechanism is the increase of (circumferential) rotational velocity at decreasing radius of rotation of material bodies, which can be rather complex material structures.

Archives of Discrimination

Abstract The present article traces the history of multiple private and state archives in Daghestan. Such collections bear imprints of competition between particular individuals and factions. As we shall see, various parties exploited the cultural resources available to them in order to project their subjectivities onto the textual and material evidence. Shifts in cultural values and fashions, together with transformations in language use and an ongoing struggle for personal and communal representation, contributed jointly to the formation of multi-layered discourses on the past. If we are to make sense of our sources, therefore, we must engage with a multitude of competing discourses that have privileged one type of historical view over others, thereby shaping the contours of the body of available material, and rendering information lacunae not just unavoidable, but themselves reflective of past events. Colonialism and coloniality are not alone in having helped configure the power structures that we find manifested in state archives. In fact, much of the competition, marginalization, and careful selection took place even before the transfer of documents to imperial institutions.

Sədrəddin Şirazinin nəfs konsepsiyası

Considering the history of philosophy, one can see that the mental states of human beings are often explained based on the idea of the soul. The essence of the soul, though, has been a matter of dispute since the Greek philosophers, and various theories have been suggested. According to Plato, who considered the soul to be made up of an immaterial substance completely different from that of the body, it is capable of living without the body, has lived before it, and will continue to do so following its death. Aristotle, however, rejecting Plato‟s substantial dualist approach, defined the soul as the perfection of the body and, unlike Plato, denied its preexistence and immortality. Islamic philosophers, although accepting Aristotle‟s definition of the soul, regarded it as an immaterial substance and saw the human being as a composition of soul and body. Safavid period Islamic philosopher Sadraddin Shirazi put forward a new soul theory different from those of his predecessors. Like Ibn Sina and other Muslim philosophers, he accepted the Aristotelian definition of the soul as “the first actuality of a natural body equipped with organs”. However, to him, the organs in the definition are not material body parts but powers of the soul. Unlike Plato, he considered the soul originated. Nevertheless, as opposed to Ibn Sina who states that the soul comes into existence simultaneously with the body, Shirazi did not regard the soul as an immaterial being at the beginning of its existence. In his view, the soul comes into existence in the body. However, thanks to substantial motion, this material being evolves into an immaterial spiritual one. This article dealing with Sadraddin Shirazi‟s concept of the soul analyses his understanding of soul and spirit, the definition of the soul, its origination, and its relationship with the body.

Proving the possibility to rationalize the process of seed materials separation with a vibro-pneumatic centrifugal separator using a theoretical model

The object of research is the seed material and working bodies of a vibro-pneumatic centrifugal separator; the subject is their interaction. The established surfaces, which are the results of the simulation of the process of separation of seed materials in the vibro-pneumatic centrifugal separator, have a curve to the plane whose parameters are the speed of the air flow and the frequency of oscillations of the working surface. It is noted that this nature of the dependence of the purity of the «heavy» fraction of seeds on parameters of the separation process makes it possible to determine the rational ranges of these parameters, at which the maximum value of this characteristic is reached. Experimental simulation of the separation process in the vibro-pneumatic centrifugal separator of wheat, sunflower, and soybean seed materials under production conditions showed a high convergence of the results with the results of the simulation of the process under the same initial conditions. It was established that the correlation coefficients between the points obtained experimentally and obtained by simulation for the given results are in the range from 0.89 to 0.95. At the same time, the differences are the purity values of the «heavy» seed fraction, and not in the nature of its change due to changes in the parameters of the separation process. The expediency of using modeling when determining the rational values of the parameters of the separation process in the vibro-pneumatic centrifugal separator is noted. This will help increase the energy and resource efficiency of the equipment due to the absence of the need for experimental setup. The rational ranges of air flow speed and vibration frequency of the rotor of the vibro-pneumatic centrifugal separator for the separation of seed materials have been determined: wheat – 1.2...1.5 m/s; 4500...5100 cycles per minute; sunflower – 1.3...1.5 m/s; 4500...5000 cycles per minute; soybeans – 1.3...1.6 m/s; 5000...5500 cycles per minute