Reshaping Process Research Articles

Numerical and Experimental Study of the Mechanical Reshaping Process for Laser Shock Clinching

This study investigates the viability of employing a mechanical reshaping method to reduce the protrusion height of laser shock‐clinched joints while improving their strength. The method involves utilizing a pair of flat reshaping dies to compress the protrusion on laser shock‐clinched joints made of copper foils and stainless steel sheets. Through numerical simulations and experiments, the study delves into the processes of laser shock clinching, mechanical reshaping, and failure modes of joints. Examination of the cross‐sectional profiles of both clinched and reshaped joints provides insights into the influence of process parameters during mechanical reshaping. Furthermore, tensile‐shear and cross‐tension tests are conducted to ascertain the mechanical properties of joints. The results show that the mechanical reshaping process not only effectively reduces the protrusion height of laser shock‐clinched joints but also significantly enhances their strength due to augmented interlock. Specifically, compressing the joint with an initial protrusion height of 0.20 mm down to 0.08 mm results in an increase in interlock from 27.65 to 62.00 μm, along with a 35.11% increase in tensile‐shear strength and a 122.17% increase in cross‐tension strength. The primary failure modes observed are neck fracture and pulling out.

Study into the reshaping process of large reservoir banks using remote sensing

Background. During the first 10—20 years after the creation of large reservoirs, the process of processing of coastal territories is activated, which leads to the loss of land resources, has a negative impact on the existing coastal infrastructure and changes in the depth of the reservoir as a result of activation of the process of rock accumulation, destruction of coastal slopes. Shoreline retreat is 10—15 meters per year. The paper considers the process of recycling of reservoir banks on the example of the Volgograd reservoir.Aim. Development of a methodology for studying and forecasting the process of reshaping of reservoir banks using remote sensing.Materials and methods. The data of 1980—1990 on the actual magnitude of bank reprocessing of the Volgograd reservoir were collected, processed and analyzed, and the coastal territory was typified. It is proposed to use remote sensing materials to obtain the values of coastal overbanking for the period from the 1990s to the present time. Forecasting of the process of reformation of reservoir banks is carried out on the basis of application of mathematical statistics methods.Results. On the basis of solving the set tasks, a universal new methodology for studying and forecasting reservoir bank reformation was proposed. The methodology was tested on the materials of the Volgograd reservoir.Conclusion. The proposed new methodology makes it possible to obtain data on the dynamics of the Volgograd reservoir bank reformation process and to make a forecast for the next 10 years. This methodology can be used to study the process of bank reformation of large reservoirs.

Dynamic Active Sites In Situ Formed in Metal Nanoparticle Reshaping under Reaction Conditions.

Understanding the nonequilibrium transformation of nanocatalysts under reaction conditions is important because metastable atomic structures may be created during the process, which offers unique activities in reactions. Although reshaping of metal nanoparticles (NPs) under reaction conditions has been widely recognized, the dynamic reshaping process has been less studied at the atomic scale. Here, we develop an atomistic kinetic Monte Carlo model to simulate the complete reshaping process of Pt nanoparticles in a CO environment and reveal the in situ formation of atomic clusters on the NP surface, a new type of active site beyond conventional understanding, boosting the reactivities in the CO oxidation reaction. Interestingly, highly active peninsula and inactive island clusters both form on the (111) facets and interchange in varying states of dynamic equilibrium, which influences the catalytic activities significantly. This study provides new fundamental knowledge of nanocatalysis and new guidance for the rational design of nanocatalysts.

The Contemporary Value of the Development of Intangible Cultural Heritage Animation

The protection and inheritance development of Intangible Cultural Heritage (ICH) has seen the significant involvement of emerging media, playing a crucial role in promoting the widespread dissemination and fostering the protection and inheritance of ICH culture. Among various new media matrices, animated imagery has emerged as a formidable force in the past decade, playing a vital role in the protection and inheritance of ICH, showcasing the contemporary value of the development of ICH animation. Examining the current status of the development of ICH animation, there is a cultural, technological, and skillful integration between ICH and animation. This synergy generates a force for development, highlighting prominent characteristics in three aspects: content reconstruction, form reshaping, and the coexistence of values. However, after the processes of reconstruction and reshaping, a new issue arises in the rapid development of ICH animationwhether the original connotations of ICH culture can be accurately preserved.

Refinements in Component Dorsal Reshaping in Primary Rhinoplasty.

Dorsal reduction and reshaping is an essential part of many rhinoplasty procedures. The steps of component dorsal reduction have been well established. The authors describe refinement of the dorsal reshaping process to improve the quality and consistency of results.

In situ preparation and determination of CeO2 high-index surface atomic structures

Understanding the properties regarding the high-index surfaces of the oxide nanocrystals is of great importance, but it remains challenging to obtain atomic-level information due to the lack of efficient preparation methods for high-index surfaces. Herein, we presented a work to in situ prepare and determine the intrinsic atomic structures of nanocrystalline CeO2 high-index surfaces via in situ spherical aberration (Cs)-corrected scanning transmission electron microscopy (STEM). By utilizing a reshaping process driven by the Wulff reconstruction, high-index surfaces of CeO2 nanocrystals including {210} {311}, and {533} were successfully prepared. Combined STEM with the density functional theory calculations, these high-index surface structures were determined with atomic precision, and interestingly {533} exhibited a unique atomic pit feature with low-coordinated Ce atoms exposure and unique electrical properties. This work has revealed new information about CeO2 high-index surfaces through experiments, enhancing our understanding of these surfaces, and also providing a new route for preparing high-index surfaces.

Drivers of Digital Transformation and their Impact on Organizational Management

Abstract Digital transformation has become a critical topic for organizations that want to stay competitive in today’s digital age. The widespread use of digital technologies has brought significant changes to the way organizations exist, operate and interact with customers. They are going through a process of reshaping and reorganizing processes and operations, as well as rethinking and redefining the human role in the value creation process. However, digital technologies and their diffusion are not the only driver of digital transformation, as the success of such change initiatives depends on many other factors, the definition of which is crucial to the success of digital transformation. The objective of this paper is to explore the drivers of digital transformation and their impact on management. The work presents a comprehensive review of the literature on digital transformation, identifying the main drivers that influence the success of digital transformation initiatives. It also defines the impact of these drivers on the management of organizations, identifying how the role of the executive is being redefined in today’s digital age.

Reshaping Strategy at Ultrahigh Strain Rates Enables Large‐Scale Fabrication of Sharp Nanostructures

AbstractMetal nanostructures are the primary component of metamaterials and plasmonics, whereas the high‐throughput production of high‐resolution nanostructures has always been a challenge. Inspired by the special hardening behavior of nanometals at ultrahigh strain rates, a reshaping strategy of hardened structures for large‐scale fabrication of ultra‐sharp nanostructures is proposed in this study. At ultrahigh strain rates, the extreme shear deformation‐induced solid state amorphization and grain‐refining effects of nanometals are first revealed, which provide the required mechanical properties and structural stability for the reshaping of primary structures. The experimental results demonstrate that nanostructures with sub‐10 nm resolution are formed using the reshaping strategy. Additionally, the pressure dependence of deformation behavior of the hardened structures in the ultrahigh‐strain‐rate reshaping process is further explored to guide the nanofabrication process. The results demonstrate that the reshaping strategy at ultrahigh strain rates allows the ultrafine shaping of nanostructures with sub‐10 nm resolution on low‐pressure and submicron‐sized molds, compared with conventional imprinting processes. The generated nanostructures using reshaping process exhibit excellent surface Raman enhancement, enabling high‐sensitivity molecular detection. The reshaping strategy provides a novel strategy for the rapid, repeatable, and economical manufacturing of sharp nanostructures, which has broad application prospects in the fields of plasmonics and photonics.

Recommendations for the assessment and forecast of shore deformations in the average flow of the Amudarya river

The paper presents the results of the field and numerical studies of the bank destruction in the middle section of the Amudarya River. The article presents the main factors of destruction of the banks during floods and low water flow. In addition, recommendations for protecting the coast from erosion are also developed. As a result of research into the process of intensive local reshaping of an easily eroded channel, hydraulic schemes have been developed for the occurrence of local bank erosion both in steady and unsteady motion in an open stream. The recommendations are based on some patterns of interaction between the river channel and the flow during the period of low water and high-water flow. The external manifestation of this interaction is the coastal deformations, leading to the planned displacement of the channel.

Security Dimensions of Geopolitical Initiatives in the Сentral and Еastern Еurope Region

From 2014 till today one can observe the process of reshaping of the existing system of international relations, the transformation of approaches to the resolution of military and political conflicts of both individual states and international organizations, the formation of new military-political alliances and blocs. The purpose of this paper is to analyse the security potential of some recent geopolitical initiatives in the region of Central-Eastern Europe, in particular, the Central European Initiative, the Three Seas Initiative and the Lublin Triangle. Central European Initiative was founded in 1989 in Budapest. It was created in order to develop the cooperation of the member states in the sphere of politics, economy and culture. The main purpose is their inclusion in the European integration processes. Currently, there are 9 EU member states from CEI member states, which makes possible establishing of the effective interaction and partnership relations between them and the states that have declared their will to join the EU. The Three Seas Initiative (or Trymorja (Three Seas), also known as the Baltic-Adriatic-Black Sea Initiative) appeared on the geopolitical map of Central and Eastern Europe in August, 2016 in Croatia, Dubrovnik. The main goal of Trymorja is to develop the economy and enhance closer cooperation between the regions of Central and Eastern Europe. The Lublin Triangle was created on July 28, 2020 “with the aim of strengthening political dialogue, trust and strategic partnership between Lithuania, Poland and Ukraine in the field of security and defence, supporting the development of economic cooperation and cultural exchange”. All before mentioned initiatives support Ukraine in its struggle against Russia. Their participants condemned the Russian invasion and cooperate for protection of the international order and law. While CEI and Trymorja are more economic initiatives, Lublin Triangle has a strong security component. The last one is important under conditions of the open war in Europe. In contemporary conditions the role of such regional initiatives is growing and they are creating the new architecture of international order.

An Embedded System Using Convolutional Neural Network Model for Online and Real-Time ECG Signal Classification and Prediction

This paper presents an automatic ECG signal classification system that applied the Deep Learning (DL) model to classify four types of ECG signals. In the first part of our work, we present the model development. Four different classes of ECG signals from the PhysioNet open-source database were selected and used. This preliminary study used a Deep Learning (DL) technique namely Convolutional Neural Network (CNN) to classify and predict the ECG signals from four different classes: normal, sudden death, arrhythmia, and supraventricular arrhythmia. The classification and prediction process includes pulse extraction, image reshaping, training dataset, and testing process. In general, the training accuracy achieved up to 95% after 100 epochs. However, the prediction of each ECG single type shows a differentiation. Among the four classes, the results show that the predictions for sudden death ECG waveforms are the highest, i.e., 80 out of 80 samples are correct (100% accuracy). In contrast, the lowest is the prediction for normal sinus ECG waveforms, i.e., 74 out of 80 samples are correct (92.5% accuracy). This is due to the image features of normal sinus ECG waveforms being almost similar to the image features of supraventricular arrhythmia ECG waveforms. However, the model has been tuned to achieve an optimal prediction. In the second part, we presented the hardware implementation with the predictive model embedded in an NVIDIA Jetson Nanoprocessor for the online and real-time classification of ECG waveforms.

Perspective of Materiality in Archaeological Heritage

In the wider professional community gathered around the notion of archaeological heritage, there is an undisputed consensus that the material traces have to be preserved for research, education and presentation, for the present and future generations. However, the climate change, pollution, intensive urbanization and other perils present a significant source of risk for archaeological remains in their original settings. Additionally, archaeological evidence may be present in the form of skeletal remains, cave drawings, landscapes or negatives of missing objects or materials. Underwater finds, stone monuments, archaeobotanical traces, fortifications, or wooden sanctuaries may all also constitute archaeological remains. In order to be preserved today, each of these examples requires various conditions, processing of material traces and preservation after excavation. Finally, all these artefacts and ecofacts gain different places in the contemporary context. Bearing in mind the variety of situations and forms in which archaeological finds and material remains may occur, it is necessary to reconsider the scope of the content embraced by the term of archaeological heritage and material traces of the past, under the conditions of rapid and intensive changes. Here the theoretical standpoint is applied derived from Bruno Latour, about the role of various actants, live and non-live participants in social processes. In this sense, objects – artefacts and ecofacts, are parts of diverse processes of negotiation and reshaping of their environment. They can equally influence, entice, stop or change processes. In order to contribute to solving this dilemma, the text discusses the notion of archaeological materialities at the intersection of conservation and archaeological perspectives. It is argued that, when facing the current problems, especially in regard to in situ preservation, the answers and inspiration should be sought for in the wider conceptualization of materiality, as the guide and source of specific knowledges, leading to new theoretical insights.

Modulating Optical Characteristics of Nanoimprinted Plasmonic Device by Re-Shaping Process of Polymer Mold.

Metal nanostructures exhibit specific optical characteristics owing to their localized surface plasmon resonance (LSPR) and have been studied for applications in various optical devices. The LSPR property strongly depends on the size and shape of metal nanostructures; thus, plasmonic devices must be designed and fabricated according to their uses. Nanoimprint lithography (NIL) is an effective process for repeatedly fabricating metal nanostructures with controlled sizes and shapes and require optical properties. NIL is a powerful method for mass-producible, low-cost, and large-area fabrication. However, the process lacks flexibility in adjusting the size and shape according to the desirable optical characteristics because the size and shape of metal nanostructures are determined by a single corresponding mold. Here, we conducted a re-shaping process through the air-plasma etching of a polymer’s secondary mold (two-dimensional nanopillar array made of cyclo-olefin polymer (COP)) to modulate the sizes and shapes of nanopillars; then, we controlled the spectral characteristics of the imprinted plasmonic devices. The relationship between the structural change of the mold, which was based on etching time, and the optical characteristics of the corresponding plasmonic device was evaluated through experiments and simulations. According to evaluation results, the diameter of the nanopillar was controlled from 248 to 139 nm due to the etching time and formation of a pit structure. Consequently, the spectral properties changed, and responsivity to the surrounding dielectric environment was improved. Therefore, plasmonic devices based on the re-shaped COP mold exhibited a high responsivity to a refractive index of 906 nm/RIU at a wavelength of 625 nm.

The effect of the roller profile on cave-in defect in reshaping process by considering nonlinear combine strain hardening

The reshaping process of pipes is an important method in producing non-circular pipes. Desired profile products are produced by passing round pipe through the rotating rollers. Cave-in defect is one of the common defects in the reshaping process. Roller design issues can decrease this kind of defect. In this paper, a method based on the slab method and the incremental plasticity has been presented to the numerical study of a 2D reshaping process. For investigating the Cave-in defect, the contact model has been developed. The concept of element elongation has been introduced to increase the accuracy of the contact model. Based on the presented method, numerical software has been developed to simulate the 2D reshaping process. Elastic-plastic equations for this subject have been driven based on the incremental method, J yielding criterion, and non-linear combined hardening. The effects of the radius of the roller profile on cave-in defects have been investigated by using the presented software (DARF). A set of experiments has been conducted in a forming station to verify the results. Results show that the presented model has higher accuracy than the Abaqus commercial software in predicting the cave-in defect. Based on the results of the model, the local increase of yielding stress directly affects the cave-in defect. Also, a meaningful relationship between the radius of the roller and the amount of the cave-in has been observed.

Influence of Substrate Hydrophilicity on Structural Properties of Supported Lipid Systems on Graphene, Graphene Oxides, and Silica.

Pristine graphene, a range of graphene oxides, and silica substrates were used to investigate the effect of surface hydrophilicity on supported lipid bilayers by means of all-atom molecular dynamics simulations. Supported 1,2-dioleoyl-sn-glycero-3-phosphocholine lipid bilayers were found in close-contact conformations with hydrophilic substrates with as low as 5% oxidation level, while self-assembled monolayers occur on pure hydrophobic graphene only. Lipids and water at the surface undergo large redistribution to maintain the stability of the supported bilayers. Deposition of bicelles on increasingly hydrophilic substrates shows the continuous process of reshaping of the supported system and makes intermediate stages between self-assembled monolayers and supported bilayers. The bilayer thickness changes with hydrophilicity in a complex manner, while the number of water molecules per lipid in the hydration layer increases together with hydrophilicity.

Free association in psychoanalysis and its links to neuroscience contributions

ABSTRACT Free association is still widely accepted as a fundamental component of psychoanalysis. However, despite notable advances in cognitive science, only a limited number of studies of free association by means of neurological methods exist. This review surveys a representative sample of neuroimaging studies on free association available to this date. Neuroimaging findings on free association, mind wandering, meditation, and other forms of spontaneous thought process seem to share significant commonalities. Free association is also examined in view of the literature on free energy, predictive coding, error prediction, and down-regulation of the default mode network. In this sense, the authors propose that free association and the role of the default mode network and the executive network are part of a complex process of adaptive reshaping of thought and autobiographical memory. The authors further propose that FA is an internally energized emotional cognitive mobility that taps into all forms of memory (episodic, implicit, embodied unformulated) and facilitates memory reconsolidation and simulation of future possibilities. In addition, creativity, as an evolutionary potential to form predictions and paradigm shifts, is presented in the context of adaptation and survival. Seen in this context, free association can lead to a creative therapeutic change in treatment that favors introspective, ontoethical, and social adaptation. Further investigation of free association by means of neuroscientific studies will need to include more specific parameters that closely mimic the experience of free association during psychoanalysis.

Geometrical deviation of end-of-life parts as a consequence of reshaping by single point incremental forming

Putting in place circular economy strategies is an urgent challenge to face. In this scenario, manufacturing processes play a relevant role as efficient material reuse enabler. Scientists have to make an effort either to find new process or to rethink old process to reprocess end-of-life (EoL) component to recover both material and functions. In this paper, single point incremental forming (SPIF) process is used for reshaping sheet metal EoL components. The entire process chain was replicated including both deep drawing process (to imitate the end-of-life component) as well as SPIF operations (to obtain the reshaped components). The geometrical deviation as a consequence of SPIF operations was studied; two different SPIF directions (named inwards and outwards) were analyzed. A wide experimental campaign along with statistical analyses was developed to analyze effects of some geometrical parameters on the observed geometrical deviation. The results are promising as limited distortions were observed and sound components were obtained in all the analyzed process configurations. Despite that, some research is still needed to better standardize the reshaping process and bring it closer to an industrial applicability.

Luther’s Reception in China and the Evolution of His Image (1840–2020)

ABSTRACT Luther was first recognized in China in the first half of the nineteenth century. Missionaries and Chinese intellectuals formed the two routes publicizing his work and his ideas in China. However, Luther's reception in China was not a holistic copy from the West, but a reshaping process which was greatly influenced by the context of Chinese history and culture. This article explores how Luther was accepted and how his image developed within this historical context from 1840 to the present day, namely how he was perceived as a negative ‘divider,' Catholic ‘evil destroyer' and Protestant ‘great reformer,' a positive ‘great reform model,' and an ‘enemy of the working and peasant classes.’ Today a multiple, tri-dimensional, and more comprehensive perspective on Luther exists.

Fitting A Square Peg into A Round Hole: Shape Control in Phase Transfer of Cubic Gold Nanoparticles

AbstractAlthough nanomaterials are widely involved in technological applications, common synthetic recipes for such colloids are restricted to special, optimized conditions, particularly for anisotropic shapes. Ligand exchange is frequently necessary for further functionalization. While such protocols are well established for spherical particles, it is more demanding to keep the corpus for thermodynamically less stable shapes. We highlight the temperature as one key for the formation of anisotropic gold nanoparticles, but also for ligand exchange protocols under shape retention or deliberate reshaping at the example of gold nanocubes. In the first part, the synthesis of CTAB capped gold nanocubes in aqueous solution is examined highlighting the narrow temperature window in which selective adsorption site blocking by bromide ions leads to the formation of gold nanocubes. While too low temperatures yield multiple particle shapes due to a low surface mobility, temperatures above the appropriate window result in more thermodynamically favored shapes. Furthermore, two protocols are presented for the exchange of the ammonium ligand CTAB by oleylamine as an organic amine including water removal from a slurrish water‐amine paste through the gas phase. In turn, precise temperature control allows to either maintain the cubic shape or induce a reshaping process towards other, thermodynamically preferred shapes such as for example truncated octahedra.

İŞLETMELERİN E-TİCARET YAPMAMASININ NEDENLERİ: COVID-19 DÖNEMİ BOYUNCA İŞLETME DAVRANIŞI

Covid-19 e-commerce created a high-pressure effect, causing sales volumes to exceed 400% and sales explosions in some sectors. This situation created strong e-commerce pressure on businesses in other sectors and business behaviors have entered the process of reshaping. In this study, the causes of business behavior changes in the Southeastern Anatolia Region were investigated on 127 enterprises using the quantitative research method. Important relationships have been found between the reasons for businesses not to do e-commerce and their behavior during the pandemic process. The suitability of the products for e-commerce, online sales preferences, insufficient infrastructure, and personal data security was among the reasons for businesses not to do e-commerce. The tactile personality traits of the customers negatively affected the risk of erroneous and fraudulent transactions. The pandemic process has affected the product sales techniques and behaviors of businesses, and their supply chains are shaping the domestic market and significantly changing producer/seller behavior in e-commerce.