Examples Of Such Transformations Research Articles

Asymmetric C3-Allylation of Pyridines.

Asymmetric intermolecular C-H functionalization of pyridines at C3 is unprecedented. Herein, we report the first examples of such transformations: specifically, C3-allylation of pyridines via tandem borane and iridium catalysis. First, borane-catalyzed pyridine hydroboration generates nucleophilic dihydropyridines; then, the dihydropyridine undergoes enantioselective iridium-catalyzed allylation; and finally, oxidative aromatization with air as the oxidant gives the C3-allylated pyridine. This protocol provides direct access to C3-allylated pyridines with excellent enantioselectivity (up to >99% ee) and is suitable for late-stage functionalization of pyridine-containing drugs.

Using L2 interactional-pragmatic resources in CMC: A case of Japanese orthography and emoji

Increasingly prevalent use of technologies such as instant messaging and online chat has transformed our traditional ways of learning and teaching pragmatics. This study presents an example of such transformation by demonstrating how computer-mediated communication (CMC) may be employed as a tool to provide second language (L2) learners opportunities to use interactional resources specific to the context of CMC, namely unique orthography and emoji. For the study, we introduced four university-level learners of Japanese to a language exchange messaging application and recorded their online text-based chat interactions with native Japanese speakers over a period of 12 weeks. We followed up the chat data with weekly stimulated verbal recalls (SVR) to investigate L2 learners’ intentions and perceptions surrounding their own and others’ use of unique orthography and emoji (48 SVR sessions total; average 30 minutes per session). Coding and thematic analysis of the chat data revealed learners’ agentive use of orthography and emoji as resources for communication. In addition, the SVR data revealed a variety of personal and interpersonal reasons behind their use, including learners’ concerns over self-presentation, interpersonal relationships, identity, and discourse management. The findings not only demonstrate how CMC can afford learners a unique environment for experimenting with a range of context-appropriate interactional resources to convey pragmatic meaning, but also shed light on the various, sometimes competing, considerations and complex processes underlying learners’ pragmatic choices in CMC.

«УЗКИЕ ГЛАЗА, КРЮЧКОВАТЫЙ НОС»: ЭТАЛОНЫ КРАСОТЫ «ДЕВ ВЕСЕЛЬЯ» КВАРТАЛА ЁСИВАРА В ПЕРИОД ЭДО

The paper considers the daily life of the “women for pleasure” yu:jo in the Yoshiwara quarter of the Edo period. It describes the concept of female attractiveness in the last shogunate era in Japan and describes cosmetic procedures in the context of the concept about the body beauty. The author focuses on individual parts of the body and their transformation: teeth, nails, hair, feet, etc. The article provides examples of such transformations as blackening teeth o-haguro, staining nails and whitening the face with a special composition of o-shiroi. It also describes the rituals common in the pleasure quarters of the Edo period, in which some parts of the body are involved: swearing an oath of love and fidelity by chopping off a finger, gifting nails and locks of hair, etc. The author analyzes popular images that visitors to the Yoshiwara were inspired by during the Edo period.

Facile transfer of excited electrons in Au/SnS2 nanosheets for efficient solar-driven selective organic transformations

Solar driven aerial oxidation processes have gained importance in organic transformations leading to the development of many nanocrystalline photocatalysts. Although such nanomaterials have many potential advantages, they often underperform due to poor visible light absorption and rapid recombination of excitons. Incorporation of plasmonic nanoparticles (NPs) on the catalyst surfaces can extend their response to visible light and improve photocatalytic efficiency by the ‘hot-electron’ injection mechanism. Nanostructures of SnS2 too absorb a part of the visible light to induce many photocatalytic reactions, though their ability to perform the selective and controlled organic transformations has not yet been observed. Herein, we demonstrate the first example of such transformation with the oxidative coupling of various benzylamine (BA) derivatives to imines under ambient conditions using SnS2nanosheets (NSs). The reaction rate improves manifold and shows ∼98 %conversion (>99 % selectivity) in 2 h under direct sunlight and open-air when the NSs were decorated with 1.5 wt% Au NPs on (Au/SnS2), making it one of the best catalysts for this reaction. We found that the large enhancement in activity upon Au loading is accompanied by a noticeable change in photo-induced charge accumulation behaviour in Au/SnS2 from the usual “spike and overshoot” one and contributed by facile transfer of excited electrons across the Au-SnS2 heterojunction in which Au NPs act as both sources and sinks for the photo-excited electrons. Finally, a detailed mechanism of the oxidation reaction has been proposed.

Spontaneous Deracemizations.

Spontaneous deracemizations is a challenging, multidisciplinary subject in current chirality research. In the absence of any chiral inductors, an achiral substance or a racemic composition is driven into an enantioenriched or even homochiral state through a selective energy input, e.g., chemical potential, photoirradiation, mechanical grinding, ultrasound waves, thermal gradients, etc. The most prominent examples of such transformations are the Soai reaction and the Viedma deracemization. In this review, we track the most recent developments in this topic and recall that many other deracemizations have been reported for solutions from mesophases to conglomerate crystallizations. A compiled set of simply available achiral organic, inorganic, organometallic, and MOF compounds, yielding conglomerate crystals, should give the impetus to realize new experiments on spontaneous deracemizations. Taking into account thermodynamic constraints, modeling efforts have shown that structural features alone are not sufficient to describe spontaneous deracemizations. As a guideline of this review, particular attention is paid to the physicochemical origin and symmetry requirements of such processes.

Transformation of the Stäckel matrices preserving superintegrability

If we take a superintegrable Stäckel system and make variables “faster” or “slower,” that is, equivalent to a trivial transformation of the Stäckel matrix and potentials, then we obtain an infinite family of superintegrable systems with explicitly defined additional integrals of motion. We present some examples of such transformations associated with angle variables expressed via logarithmic functions.

Darboux System as Three-Dimensional Analog of Liouville Equation

We discuss the problems of the connections of the modern theory of integrability and the corresponding overdetermined linear systems with works of geometers of the late nineteenth century. One of these questions is the generalization of the theory of Darboux–Laplace transforms for second-order equations with two independent variables to the case of three-dimensional linear hyperbolic equations of the third order. In this paper we construct examples of such transformations. We consider applications to the problem of orthogonal curvilinear coordinate systems in ℝ3.

On groups containing the additive group of the residue ring or the vector space

AbstractGroups which are most frequently used as key addition groups in iterative block ciphers include the regular permutation representation$\begin{array}{} \displaystyle V_{n}^{+} \end{array}$of the group of vector key addition, the regular permutation representation$\begin{array}{} \displaystyle \mathbb{Z}_{{2^n}}^{+} \end{array}$of the additive group of the residue ring, and the regular permutation representation$\begin{array}{} \displaystyle \mathbb{Z}_{{2^n} + 1}^ \odot \end{array}$of the multiplicative group of a prime field (in the case where 2n+ 1 is a prime number). In this work we consider the extension of the groupGngenerated by$\begin{array}{} \displaystyle V_{n}^{+} \end{array}$and$\begin{array}{} \displaystyle \mathbb{Z}_{{2^n}}^{+} \end{array}$by means of transformations and groups which naturally arise in cryptographic applications. Examples of such transformations and groups are the groups$\begin{array}{} \displaystyle \mathbb{Z}_{{2^d}}^{+} \times V_{n - d}^{+} ~\text{and}~ V_{n - d}^{+}\times \mathbb{Z}_{{2^d}}^{+} \end{array}$and pseudoinversion over the fieldGF(2n) or over the Galois ringGR(2md, 2m).

Micro-money, finance and real economy interrelationship in the framework of Islamic ontology of unity of knowledge and the world-system of social economy

PurposeThe purpose of this paper is to explain the structure of Islamic monetary transformation into 100 percent reserve requirement monetary system in terms of the foundational epistemology of the unity of divine knowledge (tawhid). This approach is a scholarly originality in the field of epistemological formalism concerning Islamic theory and perspectives in economic reasoning in comparative perspectives.Design/methodology/approachThe role of micro-money pursuing projects and real economic exchange relations is shown to arise by a natural causality in the ethical social economy (SE). This results in a microeconomic perspective of the quantity theory of money with ethical and social implications. A comparative study of endogenous money in the quantity theory of money points out significant differences between the theory of endogenous money in Islam and mainstream methodologies. A formal model of micro-money and its organismic endogenous relationship with the real economy is formulated with the goal of realizing social well-being, economic stabilization, and sustainability of development regimes.FindingsThis is a conceptual paper, though with the potential for continued work in applying the theory of micro-money in the Islamic methodological perspective of unity of knowledge. This is an original contribution of this paper. Islamic economists have not been able to produce a rigorous theory of micro-money. They have also not been able to situate the study of Islamic economics with its specific contribution to the field of the nature of money in project-specific financing of Islamic projects by the money-finance-real economy inter-causal relations. Thus, the findings of this paper, though of the conceptual nature, open doors to a vast field of methodological development and its application to the problem of micro-money modeling. Such a conceptual finding arising from the methodological theory of unity of knowledge and applied to the topic of micro-money along with some examples of potentiality of these approaches constitutes a vastly original field of findings as contribution. Thereby, an analytical model is established in the Islamic social economy (ISE) perspective. The model is used to explain monetary transmission and functioning of monetary policy with instruments that avoid interest rate and comply with Islamic financing requirements. The resulting model of money, finance, and real economy (MFE) systemic interrelationship in reference to the epistemology of unity of knowledge leads into the construction of a 100 percent reserve requirement monetary system with the gold-backed micro-money as currency complementing real economic transactions.Research limitations/implicationsThe present paper is of a conceptual type based on the essential ontological and epistemological foundation of Islamic social and economic thought and bearing a deeply scientific implication. The conceptual part of this paper becomes a study in the foundations. The second part follows into the study of application in the real world of micro-money in terms of financing projects. Micro-money pursues projects in the Islamic economy due to its very nature of ethical and social choices. The paper shows that such a micro-money transmission is realized by the money-finance-real economy integrated model. Thereby, some real-world examples of such transformations are given. All these together substantiate the conceptual-analytical-empirical nature of the study conducted.Practical implicationsThe development of the micro-money transmission system of generalized circular causation interrelations between MFE activities as a return to 100 percent reserve requirement monetary system with the gold standard is the profound theory that has been propounded. Its applied perspectives are implied through the MFE-model wherein micro-money pursues social projects. Furthermore, the possibility and practicality of such a conceptual model of micro-money and its transmission mechanism in the real economy are established by real-world examples of kinds of micro-money that are found to circulate or are recommended by some studies in the literature.Social implicationsThe conceptual part of the paper presents a model of generalized epistemological model of unity of knowledge characterizing the MFE circular causal interrelations as the organismic meaning of social ethics and evolutionary learning. The social implications are the epistemic foundations of the derived model in the midst of choices of life-fulfillment projects that micro-money finances and the economy sustain.Originality/valueThis is an original paper premised on the general and the specific Islamic epistemological criterion of unity of knowledge as a generalized system theory. It is now particularized to the case of money and real economy by using the Islamic perspective of creating conditions to regenerate resources continuously in SE with ethical implications. The paper is equally informative to all who like to understand the social and ethical nature of endogenous relations between money and the real economy as two great institutions of the national economy. These together bestow well-being to the society at large in the construction of SE. Specific attention in this regard is given to ISE.

Cultural Identity of the Industrial Heritage in Gdansk

Since its inception, urbanized area passes a number of changes, caused by demands of its inhabitants. Industrial heritage, including historic architecture at the brownfields, that’s more and more present in the centres of our cities, is one of the most important components of the identity. The development of civilization causes the phenomenon of spatial and functional transformations. Revitalization of the areas recently occupied by the industry, provides a unique opportunity to rediscover their values. Increasingly, however, it uses the terms “wasteland” or “brownfields”. Land use by industry is associated only with its “predatory” use, destruction, devastation. However, we can venture to say, that the existing industrial use of the land, “civilized” them. Current developments have restored a public access to the “new” urban space. At these areas preserved quite a lot valuable architectural objects. That can be seen, unfortunately, tend to forget the fact of complexity, multithreaded value areas and facilities. Analyzed causes of the risks, ways to prevent adverse transformations, methods of developing action plans to re-create the industrial architecture - are still discussed. Industrial heritage, particularly architecture, is one of the important components of the material culture that specify identity of the city of Gdansk. It provides with no doubt about its distinctiveness and originality in relation to other cities and regions. Revitalization projects are at the same time the most effective way to protect and preserve the cultural identity of the brownfield facilities. Examples of such transformations are most relevant to Gdansk and also beginning to be more and more visible. Areas of the main activities of revitalization in Gdansk, are the area of the former Imperial Shipyard and the Ołowianka Island are still and only the beginning of the necessary changes. Old industrial plants and technical facilities should be subject of the regeneration and be activating element at the scale of the whole districts and the city.

Enzyme coordinates pericyclic trifecta

Pericyclic reactions, in which electrons move in concert to rearrange a molecule’s structure, are standard tools for synthetic chemists. But examples of such transformations in nature are fairly rare. Chemists have now identified an enzyme that catalyzes three pericyclic reactions in the biochemical pathway that produces the fungal natural product leporin C. “This really opens up the idea that nature is able to affect reactions of much broader generality than we ever knew before,” says Kendall N. Houk, a University of California, Los Angeles, chemistry professor who led the study along with UCLA’s Yi Tang and University of Shizuoka’s Kenji Watanabe. The enzyme, called LepI, begins by dehydrating a leporin precursor to generate a reactive intermediate. This intermediate, with the help of LepI, can either undergo a hetero-Diels-Alder reaction to produce the desired compound leporin C, or it can perform an intramolecular Diels-Alder reaction to produce a different intermediate that

Обобщенный метод структурно-параметрического синтеза электромагнитных систем электрических машин и индукционных аппаратов. Ч.1. Результаты сравнительного анализа вариантов трехфазных электромагнитных систем трансформаторов

The commercially produced electromechanical devices of conventional designs have reached their practical limit of maturing. A smaller amount of wastes from the manufacture of magnetic cores, a lower material intensity, a lower level of losses, and more efficient cooling of electrical machines and apparatuses can be achieved through combined structural and geometrical transformation of the components in the active and mechanical parts. Examples of such transformations for induction motors, three-phase transformers and reactors are given. The availability of different versions of electromagnetic systems generates the need to develop a procedure for comparing them and making a well-grounded choice of the optimal version. The article presents a universal approach to and shows the possibilities of optimizing with respect to partial (minimal mass, cost, and losses) and integral (capitalized cost) criteria, as well as a method for performing an analytical comparative analysis of partial criteria and thermal state of different versions of electromagnetic systems having identical electromagnetic power capacities. The results from an optimizing comparison of indicators characterizing the mass, cost and losses between the basic planar version and versions of axial and radial electromagnetic systems of three-phase transformers with different versions of magnetic core manufacturing technology are presented.

Constructive quantum scaling of unitary matrices

In this work we present a method of decomposition of arbitrary unitary matrix $U\in\mathbf U(2^k)$ into a product of single-qubit negator and controlled-$\sqrt{\mbox{NOT}}$ gates. Since the product results with negator matrix, which can be treated as complex analogue if bistochastic matrix, our method can be seen as complex analogue of Sinkhorn-Knopp algorithm, where diagonal matrices are replaced by adding and removing an one-qubit ancilla. The decomposition can be found constructively and resulting circuit consists of $O(4^k)$ entangling gates, which is proved to be optimal. An example of such transformation is presented.

Potential theoretic approach to design of accurate formulas for function approximation in symmetric weighted Hardy spaces

We propose a method for designing accurate interpolation formulas on the real axis for the purpose of function approximation in weighted Hardy spaces. In particular, we consider the Hardy space of functions that are analytic in a strip region around the real axis, being characterized by a weight function $w$ that determines the decay rate of its elements in the neighborhood of infinity. Such a space is considered as a set of functions that are transformed by variable transformations that realize a certain decay rate at infinity. Popular examples of such transformations are given by the single exponential (SE) and double exponential (DE) transformations for the SE-Sinc and DE-Sinc formulas, which are very accurate owing to the accuracy of sinc interpolation in the weighted Hardy spaces with single and double exponential weights $w$, respectively. However, it is not guaranteed that the sinc formulas are optimal in weighted Hardy spaces, although Sugihara has demonstrated that they are near optimal. An explicit form for an optimal approximation formula has only been given in weighted Hardy spaces with SE weights of a certain type. In general cases, explicit forms for optimal formulas have not been provided so far. We adopt a potential theoretic approach to obtain almost optimal formulas in weighted Hardy spaces in the case of general weight functions $w$. We formulate the problem of designing an optimal formula in each space as an optimization problem written in terms of a Green potential with an external field. By solving the optimization problem numerically, we obtain an almost optimal formula in each space. Furthermore, some numerical results demonstrate the validity of this method. In particular, for the case of a DE weight, the formula designed by our method outperforms the DE-Sinc formula.

Examples of special quadratic birational transformations into complete intersections of quadrics

In our previous works (Staglianò 2012, 2013), we provided a finite list of properties characterizing all potential types of quadratic birational transformations of a projective space into a factorial variety, whose base locus is smooth and irreducible. However, some existence problems remained open. Among them one had to prove that the image of a given transformation was factorial, but in two particular situations, even the mere existence of the transformation was left as an open problem. In this paper, we use computer algebra methods to construct explicitly four examples of such transformations; two of them were among those for which it was not known that the image was factorial, and the other two show the existence of the two above referred transformations.

Mineralized tissues in dinosaurs interpreted as having formed through metaplasia: A preliminary evaluation

Evolutionary biologists define “metaplasia” as the permanent transformation of a cell identity, and there are many examples of such transformations in living vertebrates (e.g., chondrocytes transforming directly into osteoblasts). These metaplasias have been observed during the mineralization of “ossified” tendons of living birds. In the present study, we examined “ossified” tendons in Bubo and Meleagris and used the characteristics of these metaplastic tissues to recognize them in several non-avian dinosaur taxa. The fossilized skeletal elements that form our sample are varied and include hadrosaurian tendons and a nasal bone, an ankylosaur tail club “handle”, sauropod neural spines, and some dromaeosaur tail rods. The extant avian mineralized tendons were formed of a primary tissue (analogous to primary bone) and secondary reconstructions (SRs; analogous to secondary osteons). Both were composed of fiber bundles (or fascicles) that were closely packed together and separated by arc-shaped spaces in cross-section. When viewed longitudinally, they were arranged in a herringbone pattern. There is no evidence of osteocytes within the primary tendon matrix; what was previously interpreted as osteocyte lacunae are instead arc-shaped spaces between fiber fascicles, and tissue immediately surrounding vascular spaces is dense, avascular and apparently hypermineralized. Mineralization of fibers began centrally and moved in a centrifugal direction. In the non-avian dinosaurs examined, primary and secondary tissue structures were virtually identical to those found within the avian mineralized tendons. Indeed, (1) they were densely fibrous; (2) they showed fiber fascicles separated by arcuate-shaped spaces when viewed transversally, and (3) they were arranged in a herringbone pattern longitudinally. SRs differ from typical Haversian systems in possessing highly irregular borders, suggesting destruction of the fibrous matrix and formation of initial vascular spaces was accomplished perhaps by phagocytosis or enzymatic lysis with subsequent remodeling by fibrocytes, fibroblasts, or an as of yet unknown cell type. Osteocytes with canaliculi were only observed in “mature” SRs, found deep within the elements (and never close to their external borders). Because fossilized primary and secondary tissue structures were identical to those found within the avian mineralized tendons examined, it is likely that identical processes are responsible for their formation. Biomechanical properties were also likely similar, potentially affording carbon fiber-like, trauma-resistant properties to the “ossified” tendons and nasal bones of hadrosaurs, the tail “handles” of ankylosaurs, and the tail rods of dromaeosaurs. In contrast, the primary tissue from a sauropod mineralized nuchal ligament appears to be made of hypermineralized fibrocartilage, but the SRs interdigitating with the hypermineralized fibrocartilage resemble the reconstructions observed in the other fossil skeletal elements and likely formed by the same processes. Since no osteocyte lacunae were observed in any of these dinosaurian primary tissues, we hypothesize that the fossilized cranial and skeletal elements examined here formed through metaplastic transformation (perhaps from fibroblasts) rather than by periosteal and intramembranous ossification. This study suggests that alternative modes of mineralization might be more abundant in non-avian dinosaurs than previously reported.

BOOLEAN ALGEBRAS AND CLASSIFICATION OF INTERACTIONS IN SUFFICIENT-COMPONENT CAUSE MODEL

A mathematical model of the sufficient-component cause frame- work is considered based on the theories of Boolean algebra. The model consists of the space of states of a binary experiment and a set of symmetries of the ex- periment. The space of states is a Boolean algebra of n Boolean variables where n is the number of the binary causes in the experiment. The set of symmetries of the experiment is a subgroup of the group of all automorphisms of Boolean algebra of the states of experiment. This subgroup is generated by transfor- mations preserving a type of interaction. An experimenter should deduce these transformations from the peculiar properties of the experiment. Examples of such transformations are provided. Classification of interactions is obtained by the calculation of the orbits of action of the group of symmetries on the space of states of the experiment. It is shown that the classification of the interaction for the ordinary symmetries of sufficient causes is the same asreported in re- lated works. Other symmetries of the binary experiment are considered as well. It is shown that the corresponding classification of the interaction types in a binary experiment depends substantially on the symmetries of the experiment. Statistical criteria of particular types of responses are proven and the problem

Electronic phases of substances. Phase transitions with change of electron and crystalline structure

There is plenty of experimental data on high-pressure phase transformations in various materials. Variations in materials characteristics (for example, equilibrium density and bulk modulus), while the crystalline structure remains unchanged, are indicative of energy variations in outer-shell electrons of solid atoms. In experiments with crystalline structure variations, the dependence of pressure on density in some cases can be described by the same curve, the parameters of which are independent of the crystalline structure. Examples of such transformations in some materials at static compression and in shock-wave experiments are given.

Canonoid and Poissonoid transformations, symmetries and biHamiltonian structures

We give a characterization of linear canonoid transformations on symplectic manifolds and we use it to generate biHamiltonian structures for some mechanical systems. Utilizing this characterization we also study the behavior of the harmonic oscillator under canonoid transformations. We present a description of canonoid transformations due to E.T. Whittaker, and we show that it leads, in a natural way, to the modern, coordinate-independent definition of canonoid transformations. We also generalize canonoid transformations to Poisson manifolds by introducing Poissonoid transformations. We give examples of such transformations for Euler's equations of the rigid body (on $\mathcal{so}^\ast (3) $ and $ so^\ast (4)$) and for an integrable case of Kirchhoff's equations for the motion of a rigid body immersed in an ideal fluid. We study the relationship between biHamiltonian structures and Poissonoid transformations for these examples. We analyze the link between Poissonoid transformations, constants of motion, and symmetries.

Pre-Columbian agriculture in the Bolivian Lowlands: Construction history and management of raised fields in Bermeo

Recent archaeological research suggests that some parts of the Amazon Basin were significantly modified by pre-Columbian populations. One of the most impressive examples of such transformations is the raised fields of south-western Amazonia, in the Llanos de Moxos in the Bolivian Lowlands. Despite a growing interest in raised field agriculture, due to the important role it seems to have played in the development of pre-Columbian complex societies, very few field-based investigations have been performed in the Amazon Basin. As a result, there is limited knowledge of how these fields were constructed, managed and within which time-frame they were in use.This study provides a new interpretation of how pre-Columbian raised fields were managed and a chronological sequence of their utilisation and eventual abandonment. Fieldwork was carried out in the indigenous community of Bermeo, in the vicinity of San Ignacio de Moxos, where some of the best preserved fields in the Llanos Moxos are found. Magnetic susceptibility and the geochemistry of the sediments, combined with radiocarbon and optically stimulated luminescence dating, show that the raised fields were in intermittent use since as early as AD 570–770. The original surface on which the fields were built and distinct periods of construction and use have been identified. The data suggests that raised fields were built during a few separate construction events, probably linked to periods of more frequent and severe floods. The study challenges the most widely accepted theory that suggests that pre-Columbians were able to cultivate these fields on a continuous basis by transferring nutrient-rich sediments from the canals to the fields. We conclude that pre-Columbians built raised fields to overcome periods of increased flooding, with the main objective of improving drainage.