Regular Connections Research Articles

The virtual element method strength reduction technique for the stability analysis of stony soil slopes

Based on the incremental method of elastic-plastic mechanics and bilinear projection operators, by combining the strength reduction method with the φ-ν inequality, this paper proposes a virtual element method strength reduction technique for slope stability analysis. The deformations of a homogeneous slope and heterogeneous slope are solved under different strength reduction factors, and the mesh dependency problem of the method is discussed. Numerical examples verify the correctness and effectiveness of the proposed method. The results demonstrate that due to the differences in the physical and mechanical properties of soil and rocks, stress becomes concentrated in the contact zone between soil and rocks, and thus, the plastic zone surrounds the rocks. Therefore, it is difficult to form regular connections in a plastic zone, such as a soil slope. This method can be used to analyse the stability of a stony soil slope and to study the effects of particle size, rock content, rock density, and rock spatial distribution on the mechanical behaviour of stony soil slopes.

Panislamist and Pantyurkist Motion of Crimean Tatars at the Beginning of XX Century

A problem which is examined in the article before was not the article of scientific illumination. It served reason of appeal of author to the archived sources which are first entered in a scientific turn. Actuality of the article consists in that displays of panislamizm and pantyurkizm, having deep roots in the past, in one or another degree take place and now. Research is based on the documents of the Record Office of Republic Crimea, which were at one time geared-up Department of police and his Crimean structures. An author comes in to the conclusion, that in Crimea, as well as in other regions of the Russian empire, where a moslem population lived compact, panislamist and pantyurkist motion was got by development. This motion was headed the representatives of intelligentsia, well-off and influential persons. One of them was IsmaelGasprinskiy, leader of pantyurkist motion of all-russian scale. Panislamizm in Crimea was organizationally designed as organizations of «Conscience». This structure can be considered the first national political party of Crimean Tatars. Crimean pantyurkists and panislamists had regular connections with the centers of Russian, Turkish, Romanian moslem motions. The fact of organization of group of the Crimean national revolutionaries in the capital of Turkey deserves attention. It is the important certificate of the close interlacing revolutionary and panislamist activity.

Unfolding of the unramified irregular singular generalized isomonodromic deformation

We introduce an unfolded moduli space of connections, which is an algebraic relative moduli space of connections on complex smooth projective curves, whose generic fiber is a moduli space of regular singular connections and whose special fiber is a moduli space of unramified irregular singular connections. On the moduli space of unramified irregular singular connections, there is a subbundle of the tangent bundle defining the generalized isomonodromic deformation produced by the Jimbo-Miwa-Ueno theory. On an analytic open subset of the unfolded moduli space of connections, we construct a non-canonical lift of this subbundle, which we call an unfolding of the unramified irregular singular generalized isomonodromic deformation. Our construction of an unfolding of the unramified irregular singular generalized isomonodromic deformation is not compatible with the asymptotic property in the unfolding theory established by Hurtubise, Lambert and Rousseau which gives unfolded Stokes matrices for an unfolded linear differential equation in a general framework.

MODELLING WATER EXCHANGE BETWEEN COASTAL ELONGATED LAGOON AND SEA: INFLUENCE OF THE MORPHOMETRIC CHARACTERISTICS OF CONNECTING CHANNEL ON WATER RENEWAL IN LAGOON

The north-western part of the Black Sea Ukrainian coast is characterized by the presence of 12 marine lagoons which do not presently have permanent natural connections with the sea. Because of regional climate change, these lagoons have experienced a significant deficit of annual freshwater balance during the last decades and, consequently, an increase in salinity and eutrophication of their waters. One way to stabilize the hydroecological regime of lagoons is to maintain their regular connection with the sea via artificial connecting channels. The deepest and most prolonged Tyligulskyi Liman lagoon is used as an example to determine the morphometric characteristics (width, depth) of the artificial connecting channel which ensures bidirectional water exchange of the lagoon with the sea, i. e. its partial flushing. A numerical hydrodynamic model is used to estimate how the morphometric characteristics of the connecting channel influence the intensity of water exchange between the lagoon and the sea and of water renewal by seawater for the various parts of the lagoon. The dynamics of sea water volume concentration in reference points in the lagoon is used as an indicator of seawater intrusion into the lagoon and their degree of water renewal in its various zones. The proposed methodology could be used for other lagoons of the same type in the north-western part of the Black Sea.

A special class of regular connections in Finsler geometry

In this paper, we investigate intrinsically a special class of regular Finsler connections in the pullback formalism. Such connections are called P1-connections. Important result concerning the nonlinear connection of these connections is obtained. Some examples of P1-connections are given. One of these examples is investigated with some details.

Enterprise in a Market Environment: A Double Tetrad Model

System-based economic theory is a natural platform for the duality concept application in modeling and studying of economic systems. Aside from revealing the nature of economic events and showing regular connections between them, the analysis of duality also allows to develop methods to efficiently manage economic processes. This paper reexamines modeling methods of economic system performance. New approach uses double description method, via dual tetrads, one illustrative of intrasystem processes and the other exhibiting external interactions of the system. It is suggested that interactions between business and market are representable as production and implementation cycles. During the former, the initial batch of raw and producing materials are sequenced through object, environment, process and project subsystems of the enterprise. Then finished product enters implementation cycle and passes through object, environment, process and project subsystems of the enterprise’s external environment. Within this cycle the object subsystem represent the enterprise as a manufacturer; environment subsystem represents market environment for sales; process subsystem represents sales process; project subsystem represents delivery of products to the customer and transfer of revenue to the manufacturer. Production flow therefore loops through the stages of these cycles as a going concern, ensuring continuous operation of the enterprise conditioned upon coordination with market. The dual tetrad model allows to determine the roles of administration (with internal content being a controlled object) and marketing (where external environment is a controlled object) in the structure of enterprise management. This paper also analyses general patterns for identification of duality phenomena in system-based economic theory and mathematical economic models of business administration.This article is an expanded report presented at the plenary session of the XX “Corporate Planning and business Development” Anniversary Symposium (April 9–10, 2019, Moscow).

Modeling Dynamic Behaviors of Complex Fractures in Conventional Reservoir Simulators

Summary Field data have shown the decline of fracture conductivity during reservoir depletion. In addition, refracturing and infill drilling have recently gained much attention as efficient methods to enhance recovery in shale reservoirs. However, current approaches present difficulties in efficiently and accurately simulating such processes, especially for large-scale cases with complex hydraulic and natural fractures. In this study, a general numerical method compatible with existing simulators is developed to model dynamic behaviors of complex fractures. The method is an extension of an embedded discrete-fracture model (EDFM). With a new set of EDFM formulations, the nonneighboring connections (NNCs) in the EDFM are treated as regular connections in traditional simulators, and the NNC transmissibility factors are linked with gridblock permeabilities. Hence, manipulating block permeabilities in simulators can conveniently control the fluid flow through fractures. Complex dynamic behaviors of hydraulic fractures and natural fractures can be investigated using this method. The proposed methodology is implemented in a commercial reservoir simulator in a nonintrusive manner. We first present one synthetic case study in a shale-oil reservoir to verify the model accuracy and then combine the new model with field data to demonstrate its field applicability. Subsequently, four field-scale case studies with complex fractures in two and three dimensions are presented to illustrate the applicability of the method. These studies involve vertical- and horizontal-well refracturing in tight reservoirs, infill drilling, and fracture activation in a naturally fractured reservoir. The proposed approach is combined with empirical correlations and geomechanical criteria to model stress-dependent fracture conductivity and natural-fracture activation. It also shows convenience in dynamically adding new fractures or extending existing fractures during simulation. Results of these studies further confirm the significance of dynamic fracture behaviors and fracture complexity in the analysis and optimization of well performance.

Design and Analysis of a Turning Dynamometer Embedded in Thin-Film Sensor.

This paper proposes a high-strain sensitivity turning dynamometer that combines several thin-film resistor grids into three Wheatstone full-bridge circuits that can measure triaxial cutting forces. This dynamometer can replace different cutter heads using flange connections. In order to improve the strain effect of the dynamometer, the strain film sensor is fixed on the regular octagonal connection plates on both ends of the elastomer by vacuum brazing, and the stepped groove structure is also designed inside the elastomer. The dynamometer model is simplified as a four-segment cantilever beam which has different sections. The measurement mechanism model of the dynamometer system is established by the transformation relationship between deflection and strain, under external force. The standard turning tool of 20 mm square is used as a reference. The influence of the structural dimensions of the dynamometer on its strain sensitivity coefficient K is studied. The applicability of the theoretical model of dynamometer strain is verified by finite element analysis. Finally, the dynamometer with the largest K value is subjected to the bending test and compared with a standard turning tool. The experimental results show that the measurement sensitivity of the dynamometer is 2.32 times greater than that of the standard turning tool. The results also show that this dynamometer can effectively avoid the influence of the pasting process on strain transmission, thus indicating its great potential for measuring cutting force in the future.

Mechanical and seismic behaviors of bottom-flange-bolted upper-flange-welded through-diaphragm connections

The through-diaphragm connection to a square steel tubular column is a regular connection type that is used widely in Asian countries. However, connections with traditional welded flange designs often fail through bottom flange to diaphragm weld fractures owing to the unstable quality of on-site intermittent welding. Therefore, a new type of bottom-flange-bolted upper-flange-welded through-diaphragm connection is presented to avoid premature fracture failure at the bottom flange. The construction process of the new connection is more convenient than the traditional construction. In this study, three specimens were designed and tested to investigate the mechanical properties and seismic behaviors of this new connection, and different web connecting methods were considered. The failure modes, hysteretic curves, backbone curves, and energy dissipation abilities were evaluated. Together with finite element simulations, the deforming pattern and load bearing performances were discussed in comparison with the traditional welded flange. The results indicate that the bolt and plate slip would present a slight reduction in the energy dissipation ability of the new connection. However, the strength development is similar to that of the traditional welded flange connection, and the ductility satisfied the seismic provisions in moment frame connections. A two-row regular-bolted web connection can ensure a sound load transfer at the beam web.

Usage of Commercial and Open Source Digital Resources in Libraries: With Special Reference to Islamic Management Arts & Science Colleges of Tamil Nadu

There are many subscribed resources and open source resources utilized by the Students, Research Scholars and Faculty Members in higher educational institutions. Objective –of this study is to determine the Digital resources usage preferences in Arts & Science college libraries of Tamil Nadu, particularly Islamic Management Arts & Science colleges. This article also examines the usage of e-books, e-journals (both subscribed and open source), Library website and abstracting database. It also deals with the status of the colleges which are subscribing to the digital resources. Research methodology. A systematically designed questionnaire was distributed to the selected colleges and received the data for analysis. Quite a few interesting facts have come out. Findings -Accordingly the data reveals that the undergraduate and postgraduate users preferred opens access resources and Google as their search engine for quick access while on the other hand research scholars insisted that commercial resources are of help and have made a recommendation to increase them. In case of faculty they recommend more number of commercial resources for their study, research and teaching purpose. Suggestions were made by the users to improve the infrastructure facility, regular power connection and a speed increase in the high bandwidth internet connections and to conduct seminars/ workshops/ orientation to the users in order to create awareness to increase the both the category of digital resources.

Draisine railway of the Dolina Bobru

The basis of this article is the proposal to use bicycle rail trolleys as preventive measures before draisining the Dolina Bobru railway line. This tourist attraction can be promotion for the poviat of the Lwówek Śląski. This can help to reconstruction of the regular rail connection between Legnica-Złotoryja-Lwówek Śląski-Jelenia Góra.

Status of geriatric education and meeting the standards of facilities in dental schools.

CONTEXT:Information, specific tendencies, and skills are needed to provide oral care for the elderly population, and these skills should be learned in dental schools.AIMS:The aim of the study was to assess the status of geriatric dentistry education and meeting the standards of facilities in dental schools in Iran.SETTINGS AND DESIGN:In this cross-sectional study, sampling was done by census method, and all the 18 dental schools with a history of ≥6 years of establishment were selected.MATERIALS AND METHODS:A checklist was prepared in two sections, including geriatric dentistry education (existence of specific education module, considered time, specific department, specific faculty members, continuing courses for dentists, relationship with geriatric nursing houses, referral system, and specific clinics) and facilities and was distributed among dental schools. The collected data were input into SPSS (Version 20.0. Armonk, NY: IBM Corp) and analyzed descriptively.RESULTS:After a regular follow-up, 11 dental schools returned the completed checklists. Eight (72%) of them had specific geriatric dentistry education module. Only one (9%) had specific faculty member, continuing educational course, mobile clinic, and regular connection with geriatric nursing houses. None of the dental schools had specific department, specific clinic for delivering care, and a referral system from hospitals to the schools. There were no dental schools with a special transportation system for the elderly and the staff to accompany the patients without attendants.CONCLUSION:The status of geriatric dental education in Iran seems not adequate. Furthermore, dental schools are not equipped with necessary facilities for delivering care to the elderly.

Effects of home-based early intervention on child outcomes: A randomized controlled trial of Parents as Teachers in Switzerland

This randomized controlled trial examined the effectiveness of the Parents as Teachers (PAT) program in the German-speaking part of Switzerland. During the first three years after birth, 132 at-risk families with new-born children were supported by PAT with regular home visits and group connections. The 116 families in the control group had access to the normal community services, but were not supported by PAT. Baseline data and annual outcome data on health, adaptive behavior, developmental status, cognitive skills, language skills, motor skills, problem behavior, and effortful control were collected. As shown by Generalized Estimating Equations, PAT improved children’s adaptive behavior, developmental status, and language skills at the age of 3 years. Problem behavior was reduced in families with the highest risk. The results are discussed in the light of Bronfenbrenner’s bioecological model.

Hydroecological Problems of Dairy Estuary in Connection with the Instable of its Communication with the Azov Sea

Purpose. To identify the existing hydrological problems of the connecting channel between the Milky Liman and the Sea of Azov, due to insufficient morphometric performance of the channel. Methods. The analysis of hydroecological changes in the Dairy Way is the creation of a bulk model of the water body. Given the lack of a depth map, field mapping of the bottom of the studied reservoir was carried out. In order to calculate the volume of the water body of the Dairy estuary in 2012, eight transects were laid on which depth measurements were carried out through each 200 m measuring track. Measurement points were recorded using GPS. On the basis of the obtained data using the 3D Analyst module, a digital bottom relief model was constructed. His made it possible to calculate the volume of water in the estuary. Retrospective data of water volumes were calculated on the basis of measurements of the maximum depth of the estuary, obtained by the authors by way of measurements in certain years. To calculate the elements of water balance, the data of O. Dyakov was used.The transverse profile of the connecting channel is obtained as a result of field depth measurements in transects. The velocity of the flow in the channel and its throughput were determined according to the standard methods adopted in the hydrology, taking into account the direction and force of the offensive phenomena. Results. The hydrological and hydrochemical problems of the Dairy Estuary as the key territory of the Azov National Natural Park, a hydrological reserve of national importance and a wetland of international importance are analyzed. Their direct dependence on the unstable functioning of the connecting channel between the estuary and the Sea of Azov has been revealed. A historical cut of the features of the functioning of the ravine channel is shown. A digital 3D model of the estuary bottom has been built and the changes in the water level during different time periods are shown. A spatio-temporal analysis of the dependence of hydrological and hydrochemical indicators of the estuary on the channel functioning state has been made. It is revealed that the existing parameters of the connecting channel do not ensure the full functioning of the Molochny Liman and the fulfillment of ecological functions by it. Environmental changes that occur as a result of unstable and periodic connection of the estuary to the sea through the channel are analyzed: changes in water salinity, species diversity of invertebrates, fish and birds, areas of shallow water areas as feeding places for riparian birds, changes in the biological productivity of the estuary water area. Scientific novelty: On the basis of morphometric measurements of the connecting channel and the waters of the Milky Way, we have attempted to calculate the water supply capabilities of the estuary through the connecting channel and its functioning as a hydrological object. Conclusion: The adequate width and depth of the connecting channel and the regular connection of the Dairy estuary with the sea will lead to the restoration of hydrological and hydrochemical regimes to the ecologically optimal parameters. On the basis of this biological diversity in the estuary will be restored, its socio-economic and ecosystem functions will be renewed.

РОЗРОБЛЕННЯ НАУКОВОЇ КЛАСИФІКАЦІЇ ТЕКСТИЛЬНИХ ВИРОБІВ ДЛЯ СНУ З ОБ'ЄМНИМИ НАПОВНЮВАЧАМИ НА ПРИКЛАДІ ПОДУШОК

An analysis of existing classification systems for bedding and the development of scientific classification on an example of one kind – pillows. Methods of logical analysis, generalization of scientific literature and normative documents are used. A list of classification characteristics of pillows used during the formation of their assortment is analyzed. A detailed classification of pillows is presented in the form of a hierarchical subsystem,, which takes into account the peculiarity of pillows and regular connections between them. The scientific classification of textile products for sleep on the example of one type – pillows is developed. The scientific classification of textile products for sleep allows us to determine the place of this group of goods in the section of textile products, which improves the trade-contract conditions.

E-Learning Readiness of Turkish Medical Students: A Sample from Gazi University

Objective: We are currently training a generation of students who cannot remember the days before Internet, are learning in digital environment, will practice in a predominantly e-health world. We think they are ready to learn online, but are they? The aim of this study was to determine the students’ readiness for e-learning in terms of the technologies they have with the skills for online learning. Methods: This is a descriptive study with survey method by using a scale of university students’ readiness for e-learning. The research was done with volunteer 4th-year medical students. Results: The results show that e-learning readiness for medical students is enough for five sub-scales, and almost enough for one sub-scale. The medical undergraduates have smartphones(92.3%), laptops(81.6%) and tablets(26.7%) only 0.9% of the undergraduates have no hardware. The participants have regular internet connection(92.1%) and mobile internet connection(80.89%). Male undergraduates’ readiness is significantly higher than females. The undergraduates who use internet for studying and learning during the day or several times in a day have statistically higher readiness levels than others. Conclusion: Medical students’ e-learning readiness level is moderately high. They use Internet daily with own hardware. The organizational readiness is well in terms of resources, learning management systems.

Improving Casing Integrity With Induction Brazing of Casing Connections

SummaryBrazing technology allows metallurgical joining of dissimilar materials using a filler material. In this paper, brazing technology applied to casing connections is presented as an enhancement of existing (premium) connections and/or a replacement of metal/metal seals. The initial application was triggered by challenges with mechanical and pressure integrity after the expansion of casing connections. Creating a strong bond between the pin and the box could resolve this and remove the need for a metal/metal seal. Brazing was selected because of the combination of ductility and high bond strength and the relatively fast process to create the bond. The brazing process or the temperature/torque/time (TTT) process is performed using regular casing connections, a filler material deposited by flame spray and a flux. Two processes were developed, one for expandable (VM 50) grade material and one for quenched and tempered grade material. A rig-ready (Class 1, Division 1) prototype brazing system was developed consisting of an induction coil as the heat source, an environmental chamber to shield the hot work, and a modified power tong to provide torque. The results of a series of brazing trials on 8⅝- and 9⅝-in.-casing connections are presented. The brazed connections were subsequently capped, end-pressure tested, expanded (when applicable), and load cycled. It is concluded that both processes produced leak-tight casing connectors before and after expansion (when applicable), as shown by full-scale tests.

Moduli of regular singular parabolic connections with given spectral type on smooth projective curves

We define a moduli space of stable regular singular parabolic connections with given spectral type on smooth projective curves and show the smoothness of the moduli space and give a relative symplectic structure on the moduli space. Moreover, we define the isomonodromic deformation on this moduli space and prove the geometric Painleve property of the isomonodromic deformation.

A Procedure for Modeling Photovoltaic Arrays under Any Configuration and Shading Conditions

Photovoltaic (PV) arrays can be connected following regular or irregular connection patterns to form regular configurations (e.g., series-parallel, total cross-tied, bridge-linked, etc.) or irregular configurations, respectively. Several reported works propose models for a single configuration; hence, making the evaluation of arrays with different configuration is a considerable time-consuming task. Moreover, if the PV array adopts an irregular configuration, the classical models cannot be used for its analysis. This paper proposes a modeling procedure for PV arrays connected in any configuration and operating under uniform or partial shading conditions. The procedure divides the array into smaller arrays, named sub-arrays, which can be independently solved. The modeling procedure selects the mesh current solution or the node voltage solution depending on the topology of each sub-array. Therefore, the proposed approach analyzes the PV array using the least number of nonlinear equations. The proposed solution is validated through simulation and experimental results, which demonstrate the proposed model capacity to reproduce the electrical behavior of PV arrays connected in any configuration.

Морфолого-культуральні властивості рідкісного лікарського гриба Sparassis crispa (Sparassidaceae, Polyporales)

<p>A verification of <em>S</em><em>parassis</em><em> crispa</em><em> </em>(Wulfen) Fr. strains of the IBK Mushroom Culture Collection using molecular-genetic and cultural-morphological methods were done. For all <em>S. crispa</em> strains a complete determination of the nucleotide sequences of the internal transcribed spacer: ITS1, 5.8S and ITS2 regions of rRNA, as well as the partial determination of 18S and 28S sequences surrounding the ITS, was performed. As a result of the search in the gene bank, the <em>S</em><em>. </em><em>crispa</em> samples deposited there showed 99-98% identity with the sequences we received, thus confirming the species of the examined strains. On the basis of the sequences we received, investigated strains were registered in NCBI GenBank. To confirm the taxonomic affiliation of the strains we studied their cultural and morphological characteristics. Microstructures of vegetative mycelium by optical and scanning electron microscopy were investigated. In all <em>S. crispa</em> cultures we observed the hyphae with regular one-sided gapless clamp connections, numerous secretory cells on the surface of the hyphae, anastomoses, filamentous strands and films. We studied the growth rate and morphology of the strains on seven agar nutrient media. According to the radial growth rate of <em>S. crispa</em> cultures can be placed to the very slowly growing mushrooms, growth rate of 0,5−2,8 mm/day. We found the selective media such as malt agar with the addition of pine sawdust (SS) and larch sawdust (SM) as most favorable for the vegetative growth and generative stage for all strains, temperature of incubation was 26 ± 0.1 °C. For mycelial growth the critical temperature was 39 ± 0.1 °C for <em>S. crispa</em> strains 312, 314 and 40 ± 0.1 °C for the strains 304, 2004. We confirmed belonging of studied strains to <em>S. </em><em>с</em><em>rispa</em> species according to established morphological and cultural characteristics. This result coincided with the results of DNA typing. Thus, the obtained mycelium growth parameters on nutrient media, micro- and macromorphological characteristics can be used as additional taxonomic characteristics of <em>S. </em><em>с</em><em>rispa</em> culture in the vegetative stage of growth.<strong> </strong>The strain <em>S. </em><em>с</em><em>rispa</em> 314 may become a potential producer for new fungal biotechnologies in Ukraine in the near future and reintroduction of this species in the nature.</p>