bluuebunny/crossref_metadata_2025 huggingface dataset:
Impact of Riveting Parameters on Mechanical Properties of Aluminum Alloy (LY-12) Sealant Applied Lap Joint of an Aircraft
Authors: Amjad Sehran , Haider Ali , Gul Rizwan Mehmood , Jamshaid Muhammad , Qureshi Akbar Ali
Published: March 2023

The assembling process includes various techniques, out of which riveting has been employed most successfully in fields like construction of enormous structures, auto-motives, and most notably in the aerospace industry. This process includes marking, drilling followed by riveting. Furthermore, being a successful process, most of the aircraft structure is assembled using rivets. However, various factors contribute to the result. Therefore, the effect of riveting process parameters such as Sheet Thickness, Rivet Diameter, Rivet Type, and Riveting Sequence have been studied on responses, i.e., Deformation and Joint Load Capacity of lap joint composed of Aluminum Alloy sheets (LY-12) at T0 condition by sandwiching aerospace-grade sealant (XM-22B). Each of these parameters is studied on three levels and the experimental setup is designed using Response Surface Methodology (RSM). The main objective of this work is to demonstrate the effect of riveting parameters on lap joints with sealant and analyze the effect through careful measurement of deformation and joint load capacity of the test specimen. Finally, a variance analysis (ANOVA) is performed to identify significant factors influencing response parameters using Design Expert Software V-12.
Experimental Modal Analysis of Angle Signals Based on the Stochastic Subspace Identification Method
Authors: Kim In-Ho
Published: March 2023

This paper aims to verify the extraction of modal parameters from angle signals using the stochastic subspace identification (SSI) method. The use of angle signal-based mode shapes can reduce the loss of node information and enhance the robustness in curva-ture-based damage detection. In this regard, the system identification of angle signals should be first conducted prior to the damage detection. For large structures, an out-put-only system identification method should be considered for the modal analysis of an-gle signals, because artificial shaking excitation or impact excitation is practically impos-sible. In order to achieve this, the SSI method is used; it is one of the most powerful tools among the output-only system identification methods because it does not cover nonlinear problems. In order to demonstrate the system identification process of angle signals using the SSI method, the transformation matrix is assumed to represent the relationship be-tween the angular displacement and the normal displacement. Next, the modified block Hankel matrix that consists of angle signals, which can be expressed as a multiplication between the transformation matrix and displacement series vector, is constructed. The observability matrix can be estimated using the singular value decomposition for the pro-jection of the future part onto the past part of the modified block Hankel matrix. Finally, the natural frequencies and angle signal-based mode shapes are calculated using the state and observation matrices. In order to verify the results of the analytical studies, the modal properties estimated from the numerical simulation and the SSI method using angu-lar-velocity measurements are compared.
Delineation and Evaluation of Groundwater Quality by using GIS mapping system and Statistical Approaches in Southern Punjab, Pakistan
Authors: Ali Asif , Shakoor Aamir
Published: March 2023

The groundwater is the second largest source of water in Pakistan. This study deals with the delineation and evaluation of spatial variations in the groundwater quality in Multan, Khanewal, Lodhran, Vehari, Pakpattan and Sahiwal district of Southern Punjab, Pakistan. The three major indicators such as EC, SAR and RSC (Electrical Conductivity, Residual Sodium Carbonate and Sodium Adsorption Ratio) are used and appraisal for irrigation to check groundwater quality via GIS, GS+ software and statistical analysis. The groundwater samples were evaluated for its applicability in irrigation and for mapping consequence . The parameters analyzed were compared with Standards that were adopted by WAPDA, PID and PCRWR. Kriging interpolation maps were delineated with three zone layers such as good (weight = 3), marginal (weight = 2) and bad (weight = 1). It was concluded that the area under marginal and hazardous groundwater quality with low weights was significantly increased from 2 to 10% and 7 to 40% in pre- and post-monsoon respectively due to EC, SAR and RSC parameters. Most of the study area (> 35%) contaminated was due to EC parameters. Most of the study area (tehsil Kabirwala) was observed with low quality against all discussed quality parameters in both season. The groundwater quality parameter weightage decreases from northeast to southwest of study region. Low weightage zones were observed in lower part of the area. It is recommended that in high vulnerability area artificial well recovery, auriferous storage and rain harvesting techniques should be adopted specially in lower part to reduce salinity of water. The policy maker should make policies about regulation of water resources with good quality for best utilization of water for agricultural and industrial use.
Evaluation and Performance of SM2-Satellite Precipitation Product with Reference to Ground-Based Observations, in different cities of Pakistan
Authors: Ali Asif , Farid Hafiz Umar
Published: March 2023

Rainfall is the fundamental component to drive globalized hydrological cycle. Satellite-based precipitation having great inherency over land with wider range of applications, but their validation is at risk due to lack of rain gauge observations in different regions of the world. All precipitation product community are used to monitor the substitute data of rainfall in water resources, climatology, hydrology, meteorology, and geography. This research paper calculated the performance of SM2 precipitation product on different region, climate, elevation, and rainfall rate. For investigation, the ten statistical metrics and three categorical statistic have been analyzed at 11 station over 12 years period from 2007 to 2018. The different statistical technique assessed the analysis of precipitation product at different temporal scales (monthly, seasonally, and yearly) to investigate performance score. On the monthly and yearly time scales, product was less reliable with low correlation (0.0057 to 0.67) vary with elevation but best correlation (0.81) and linear regression coefficient (1.02) was calculated at seasonal scale than rest scales. The rainfall captured rate at seasonal scale with (>80%) was more than another scale. The outcome of this product from satellite community is less at monthly scale with significantly under and overestimation and with BIAS (-34.08% to 132.45%) than seasonal and yearly scale. But slightly over and underestimation pattern exist at seasonal scale with BIAS score (5.13% to -19.61%). During winter, research product reduces its systematic bias, NMAE and NRMSE and maintains its potential at also another seasons. The impact of elevation and different rainfall events are also investigated to detect the performance of SM2 satellite. More intense precipitation was captured by SPPs SM2 with high score of POD (> 0.70 to 0.99) vary with respect to more elevation area. The elevation trend increasing gradually from south (near mean sea level) to the northwest (northern areas of Pakistan) that having complex topography with intense rainfall rate. Same interpolated pattern of precipitation were assessed from south to northern areas of Pakistan like elevation using Arc GIS software. The overall evaluated results shows that precipitation product can detect heavy precipitation events easily than less intense events at monthly and yearly scale but reliable to capture at seasonal scale. This SPP is not completely reliable for low precipitation event with high altitude.
To Study the Structural, Optical and Magnetic Properties of Ni-Fe Doped ZnO Diluted Magnetic Semiconductors
Authors: Rehman Abdul , Rizvi Nakash , Khan Muhammad Tahir
Published: March 2023

The iron and Nickel co-doped in zinc oxide nano-particle, Zn1-x-yFexNiyO {(x=0, y=0), (x=0.05, y=0), (x=0, y=0.05), (x=0.03, y=0.02)} were prepared by Sol-Gel technique. This type of synthesis is used for the manufacture of a Field Effect Transistor (FET) detector which is extremely sensitive, secure, and capable of reproducing. It is also used for the detection of the Piperidine (CH2)5NH (hexahydro pyridone) chemical.

The well-closed pack spherical nano-particles of the identified crystalline structure of the usual wurtzite hexagonal phase were achieved by characterization of X-Ray Diffraction (XRD). The blue shift was well observed of Co-doped samples as compared to un-doped or single-doped ZnO nanoparticle samples by UV-visible absorption spectrum. The Fourier Transform Infrared Spectroscopy (FTIR) reveals the existence of chemical bonding and functional groups are established and the occurrence of iron Fe in modes associated with iron Fe in addition to ZnO.  The room temperature ferromagnetism was achieved in single or co-doped (Fe-Ni) with ZnO nanoparticles and is confirmed by magnetic characterization (VSM). It was perceived that magnetic saturation was improved in Fe-Ni Co-doped samples relative to pure or single doped. Also, the characterizations of samples show that the exchange interaction of Ni and Fe dominates over Ni-Ni and Fe-Fe interactions.
Drinking water quality monitoring of centralized water storage reservoirs in various zones of the National University
Authors: Javed Aiza , Amjad Hira , Hashmi Imran
Published: March 2023

Physico-chemical and microbiological pollutants may compromise quality of drinking water. This study aims to highlight various physico-chemical and microbial parameters of drinking water samples from centralized water storage reservoirs of National University. Major water quality parameters which were examined in this study includes pH, Electrical conductivity (EC), Turbidity, Total suspended solids (TSS), Total dissolved solids (TDS), Dissolved oxygen (DO), Residual chlorine, Hardness, Alkalinity. Moreover, microbial analysis of water samples was also carried out through Most Probable Number technique (MPN). Results show that all the physico-chemical parameters were within prescribed limits of World Health Organization and Pakistan Drinking Water Quality Standards (WHO/PDWQS) in both underground and overhead water storage reservoirs except DO ( 9.05-9.2 and 9.05-9.1 mg/L ), TSS (10-20 and 3.3-10 mg/L) and residual chlorine (0.08-0.14 and 0.19-0.28 mg/L) respectively. The MPN index values for both underground and overhead water storage reservoirs ranges between 16- >23 and 1.1-12 respectively and it shows  high microbial contamination in water due to low detection of residual chlorine. The results highlight that water from centralized water storage reservoirs of National University is unfit for drinking purposes. Statistical analysis such as paired t-test also reveals that water quality parameters from underground and overhead storage reservoirs are not significantly different from each other except EC and TDS having P values <0.05. It is necessary to safeguard water contamination in water storage reservoirs by monitoring regular inspections and chemical cleaning of water storage reservoirs otherwise it will cause serious threats to well-being of the community.

Key words: water storage reservoirs, drinking water, microbial quality of water, physico-chemical parameters, paired t-test
Treatment of Periapical Infected Site and Bony Defect in the Maxillary Esthetic Zone by Extraction & Immediate Implant Placement Particulate Equine Xenograft & Equine Pericardial GTR Membrane: A Case Report
Authors:   Department Of Periodontology, Chandra Dental College & Hospital, Barabanki, India, Agrawal Sudhanshu
Published: March 2023

Immediate placement and restoration of the implant is a widely used protocol, but loading of implants in the site which is periapically infected is still not very popular. Very few studies have been conducted and it’s still in debate. The conventional protocol of placing implant and waiting for it to osseointegrate is time consuming and compromises patient’s esthetics and psychological comfort
Correction of Gummy Smile with or without Bone Contouring: A Report of Four Cases
Authors:   Department Of Periodontology, Chandra Dental College & Hospital, Barabanki, India, Agrawal Sudhanshu
Published: March 2023

Usually, in function of smile, the lips are retracted and elevated to expose a portion of upper incisor teeth .Unlike the case of gummy smile so called “horse smile” there is exposure of all incisors in addition with a large portion of gums above it. A harmonious smile is considered an icon of beauty in modern society
Toothbrushes and Tooth Brushing Methods: A Periodontal Review
Authors:   Department Of Periodontology, Chandra Dental College & Hospital, Barabanki, India, Agrawal Sudhanshu
Published: March 2023

Tooth brushing is a basic technique to prevent major oral diseases (e.g., dental caries and periodontal disease). Several methods of tooth brushing technique devised by some dental scholars have been introduced. However, some guidelines to select the proper method are needed for an individual patient considering age and oral status. Methods such as rolling, Fones’, Bass, Stillman, Charters, Watanabe’s tooth-pick, and other modifications have been introduced
Metastatic Malignant Melanoma of the Stomach: An Unexpected Phenomenon of the Disease
Authors:   Department Of Pathology, Cancer Research Center, Babol University Of Medical Sciences, Mazandaran, Iran, Nematollahi Mahvash
Published: March 2023

Regarding the unfavorable outcome of gastric metastatic melanoma, the treatment choice is still under investigation. However, early diagnosis is important for the appropriate assessment of patients as candidates for surgical interventions.
Detection of abnormal situations in the operation of communication channels
Authors: Chikalo Oleg V. , Obukhov Ilya A.
Published: March 2023

Currently, many countries have high expectations for the digitalization of economies, meaning various elements of automation. One of the most effective tools in achieving a new level of digitalization can be the Internet of Things (IoT). The development of IoT provokes the fourth industrial revolution (Industry 4.0), which will be marked by the transition to fully automated digital production, the use of cyber-physical systems and cloud computing. Processes will be controlled by "smart" devices online. An example of such smart devices is modern telecommunications equipment, the operation of which accumulates large amounts of data - telemetry of various kinds. This "big data" can be used to predict possible future failures and other faults (abnormal situations) in the equipment itself. This article is devoted to the issue of creating models of normal behavior of various characteristics of communication channels, which is central in creating predictive diagnostics systems. Examples of such models are given.
Survival and Continuity of a Community: Smoke Signals and Native American Women
Authors:   Institute of British & American Studies Center for International Area Studies Hankuk University of Foreign Studies, Lim Eunha , Kim Seonghoon
Published: March 2023

This article analyzes the representation of the influence of Native American female characters on the survival and continuity of their individuals and communities in the film Smoke Signals. Placing female characters at the center to subvert the Hollywood’s Native American stereotypes, Smoke Signals shows that the individuals and communities can exert power and wisdom for survival and continuity. The film evokes the pivotal role that Native American women have played in maintaining and protecting the community based on the maternal-centered traditions of Native Americans, which has not been distinctly illuminated in US media and Hollywood. The female characters in the film are represented as independent and active women who respond flexibly to harsh reality; their actions trigger change in the male characters, and, ultimately, the survival, continuity, and solidarity of the entire community. In particular, the film represents the ways in which the lifestyle and attitude of Native American women transcend the dichotomy between the older generation and the younger generation to affect the entire community. This underscores the modern continuation of Native American women's traditional abilities: adaptability and flexibility. Therefore, by focusing on the scenes and sequences related to the traditions and influence of Native American women in the film, this article explores how the representation of female characters plays a key role in the overall narrative of Smoke Signals.
Disability/Illness Narrative in Skim
Authors:   Institute of British & American Studies Center for International Area Studies Hankuk University of Foreign Studies, Yoo Hyun-Joo
Published: March 2023

Skim (2008) by Mariko Tamaki and Jillian Tamaki is a semi-graphic memoir based on the coming-of-age story of Kimberly Keiko Cameron, a Japanese-Canadian queer girl whose nickname is Skim. Skim is 16 years old and attending a Catholic girls’ high school in Toronto in the 1990s, where most students are white and thin. Due to her non-whiteness, queerness, fatness, depression, and interest in Wicca, Skim experiences discrimination, marginalization, and exclusion at school, which lead to daily trauma for her. Trapped within in her loneliness, Skim eats as a defense mechanism against the normalized daily trauma. This eating, in a vicious circle, leads to more fatness and causes her to become an object of ridicule and stigmatization, ultimately leading to suicidal depression. Skim is singled out as a person who is the most likely to commit suicide at school and thus faces institutional control, surveillance, discipline, and oppression led by her teachers and peers, who consider Skim’s fatness (a physical disability) and depression (a mental illness) to be an individual problems to be fixed or eliminated with the help of school-based suicide prevention programs. In this paper, I will examine how Skim helps readers understand youth suicidal depression and eating disorders in connection with sexism, ableism, racism, sanism, and heterosexual normativity, all of which are deeply rooted in Canadian society. In addition, I show how Skim, presented in a diary format, resists the triumphant narrative of “getting better” and ultimately contributes to eliminating the prejudice that young people marginalized due to fatness, queerness, non-whiteness, and suicidal depression face, making them powerless, passive, and voiceless in Canadian society.
Imagination and Love: The Role of Rousseau in Shelley’s The Triumph of Life
Authors:   Institute of British & American Studies Center for International Area Studies Hankuk University of Foreign Studies, Jang Sunghyun
Published: March 2023

This paper reads P. B. Shelley’s unfinished poem The Triumph of Life (1822), which recounts the poet’s visionary experience of beholding the triumphal procession of Life, in relation to his claims about imagination and love in A Defence of Poetry (1821). For Shelley, imaginative faculty forms the basis of a feeling of sympathy for others, which develops into love. This notion of sympathetic imagination appears to be the key to understanding the poem, especially the significance of Rousseau who guides the narrator through the apocalyptic vision. The principal purpose of this article is to elucidate the role of Rousseau in the Triumph, whom Shelley considers to be essentially a poet, i.e. a man of imagination. To Shelley’s way of thinking, Rosseau is proven highly imaginative in developing radical political ideas which had their roots in his fervent desire to remedy the ills of the world, and which profoundly impacted the outbreak of the French Revolution. However, Rousseau’s encounter with the vision of the “shape all light,” a malevolent spirit who offers him the cup of nepenthe, blots out his memories of the past, hence trampling the spark of imagination in his mind. For his ability to imagine ideal conditions for human existence is based upon his criticism of the harsh realities of the world—criticism being an act of remembering the past. However, Rousseau’s liberation from the chariot of Life is attained by his unswerving loyalty to democratic ideals, which holds true for Shelley.
Variational Quantum Algorithms for Computational Fluid Dynamics
Authors: Jaksch Dieter , Givi Peyman , Daley Andrew J. , Rung Thomas
Published: March 2023

Quantum computing uses the physical principles of very small systems to develop computing platforms which can solve problems that are intractable on conventional supercomputers. There are challenges not only in building the required hardware but also in identifying the most promising application areas and developing the corresponding quantum algorithms. The availability of intermediate-scale noisy quantum computers is now propelling the developments of novel algorithms, with applications across a variety of domains, including in aeroscience. Variational quantum algorithms are particularly promising because they are comparatively noise tolerant and aim to achieve a quantum advantage with only a few hundred qubits. Furthermore, they are applicable to a wide range of optimization problems arising throughout the natural sciences and industry. To demonstrate the possibilities for the aeroscience community, we give a perspective on how variational quantum algorithms can be used in computational fluid dynamics. We discuss how classical problems are translated into quantum algorithms and their logarithmic scaling with problem size. For an explicit example, we apply this method to Burgers’s equation in one spatial dimension. We argue that a quantum advantage over classical computing methods could be achieved by the end of this decade if quantum hardware progresses as currently envisaged and emphasize the importance of joining up development of quantum algorithms with application-specific expertise to achieve a real-world impact.
STUDY OF THE INFLUENCE OF ELEVATED TEMPERATURE ON THE DISSIPATIVE PROPERTIES OF UNIDIRECTIONAL CFRP
Authors:   G.S.Pisarenko Institute for Problems of Strength of the NAS of Ukraine, Derkach Oleh , Kobzar Valerii ,   G.S.Pisarenko Institute for Problems of Strength of the NAS of Ukraine
Published: March 2023

An experimental method for determination of composite materials dissipative properties, the main characteristic of which is the minimization of external energy losses and ensuring uniform distribution of deformations along the specimen working part under the pure bending condition has been developed. The scheme of the modernized experimental setup is presented. Its mechanical system represents a closed circuit in which the energy in material specimen under flexural vibrations is dissipated. Automated testing and registration of vibration characteristics were carried out by the method of attenuating vibrations at different temperatures. Based on the results for a set of experimental studies on the determination of the dissipative properties of unidirectional CFRP specimens under the pure bending conditions, the dependencies of the logarithmic decrement of vibrations on the relativedeformation in the range (2...12)∙10–4for temperatures from 300 K to 423 K was established.To analyze the effect of temperature on the dissipative properties of the composite, a parameter is proposed that is determined by the increment of the logarithmic decrement of vibrations (LDV) before deformation. It is shown that it is a more informative indicator of the structural integrity of carbon fiber samples, even with a relatively small violation of it due to heating and simultaneous cyclic deformation, compared to the relative growth of the LDV and the drop in the vibration frequency.The obtained experimental data and the presented method of investigation the dissipative properties of materials can be used as a directory data in the design of new models of equipment and in the development of mathematical models of composite structural elements operating under dynamic loads and elevated temperatures.
GEOMETRIC ASPECT OF CHOOSING MODELS OF BASIC TECHNOLOGICAL EQUIPMENT
Authors:   National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Lapkovsky Serhii , Danylova Liudmyla ,   National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Frolov Volodymyr ,   National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Prykhodko Vasyl ,   National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Gladskyi Maksym ,   National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”
Published: March 2023

Now methodological aspect of choosing machine tools is still not worked out, we can clearly conclude that it is a very urgent task that needs a special attention and responsibility. The purpose of the article is to create methodological foundations for a more justified choice of models of metal cutting machines when designing technological processes of manufacturing parts. It is proved in the article that the geometry of surfaces is the dominant feature of the items in the solution of the problem of choosing a particular model of machine tool, which can provide a process forthe manufacture of the part.
DFM –AN INALIENABLECOMPONENT OF PRODUCT QUALITY
Authors:   National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Lapkovsky Serhii , Frolov Volodymyr ,   National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Danylova Liudmyla ,   National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Prykhodko Vasyl ,   National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute, Gladskyi Maksym ,   National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”
Published: March 2023

The article is devoted to questions on possibility and expediency of work on working of products on DFM irrespective of works on working of products on other properties of quality. Depending on the properties, there are the following quality indicators: purpose indicators, reliability indicators, ergonomic indicators, aesthetic indicators, safety indicators, ecological indicators, manufacturability indicators, transportability indicators, standardization and unification indicators, patent lawindicators, economic indicators. The economy of countries where a lot of attention is paid to quality (both on the part of the producer and on the part of the consumer), have achieved great success in the development and provision of a high standard of living for their citizens. DFM as property of a product is a part of its quality and is one ofproperties of quality of products, and product working on DFM is an integral part of works on maintenance of quality of products. DFM is characterized by a number of indicators. DFM indicators form one of the types of product quality indicators along withindicators of purpose, reliability, level of standardization and unification, etc. The need for this research arises due to the fact that different specialists conduct the testing of products according to the main quality properties. So, for example, testing and evaluation of products according to reliability indicators is carried out by specialists in the field of reliability theory, engineers-designers are involved to test the ergonomic properties of products, testing of products for manufacturability should be carried out by technologists, etc. For the decision of the given problem it is offered to use methods of the theory of potential efficiency of complicated systems. The theory of complicated systems supposes that at designing of products it is supposed to conduct working of products on DFM and other separate properties or quality indicators, however working of designs of products on DFM and other separate indicators of quality is less effective, than simultaneous working on all indicators of quality.
DESIGN AND TECHNOLOGICAL IMPROVEMENTS OF THE PROCESS OF LASER CUTTING OF METALS
Authors:   National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Romanenko Victor , Bloshchytsyn Mykhaylo ,   National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Zheget Ivan ,   National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Yurchenko Yuriy ,   National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute»
Published: March 2023

An analysis of the existing methods of laser cutting is given and the features of constructive and technological improvement of the process are presented. The technology of laser cutting of metals, in particular sheet metal, is constantlybeing improved and modernized. Expanding the functionality of existing equipment on the market can be done by using two or more laser heads. The laser heads move synchronously and are programmatically coordinated among themselves in six coordinates. This allows not only to increase the speed of the cutting process, but also provides the possibility of simultaneously cutting several different parts or holes from one sheet or more sheets, which ensures the expansion of functionality, as wellas the acceleration of the cutting process.At the same time, the disadvantages of the traditional method of contour laser cutting are the low quality of the cut edges. To improve the quality of laser cutting, it is recommended to reduce the thermal effect on the metal of the workpiece with the help of a cooling liquid sprayed along with the gas flow, which allows to reduce the thermal conductivity of the metal of the workpiece. A significant drawback of this method is the complex design of the laser installation. Taking into account other disadvantages of the traditional contour laser cutting method (non-perpendicularity and high roughness) and the possible range of metal thicknesses, a combined laser cutting method was proposed. A combined laser installation was developed, where sheet metal is subjected to mechanical activation before laser cutting, which consists in cold plastic deformation. At the same time, the mechanical activation of the metal sheet occurs, which leads to a decrease in the thermal conductivity of the metaldue to its deformation hardening and, as a result, a reduction (localization) of the zone of thermal influence in the cutting zone. The observed effect is due to the compaction of the crystal lattice of the metal, the increase in the density of dislocationsduring plastic deformation. Whenapplying preliminary deformation, not only the width of the cut in the metal is reduced, but also the roughness of the cut surface and the size of the thermally affected zone at its edges.The presented technological solution makes it possible to reduce the cost of the product by reducing the labor intensity of further metalwork as a result of increasing the accuracy of dimensions and reducing the roughness of the cut surface and significantly reducing the width of the cut.
THE CONCEPT OF CREATING OF A DIGITAL TWIN MODEL OF AN INTELLIGENT SPINDLE UNIT
Authors:   Chernihiv Polytechnic National University, Sapon Serhii
Published: March 2023

The digital twin technology isthe basis for the implementation of a cyber-physical technological system and is the core technol-ogy of Industry 4.0. A digital twin of a spindle unit is a dynamic virtual model that connects the spindle unit as a real physical object with its digital model in real time via two-way information links and reflects all the features of its design and functioning during its life cycle in real time. The key component of the digital twin of the spindle unit is its model, which is a set of digital models that describe its design, technological, operational, parameters and physical and mechanical processes that occur during the operation of the spin-dle unit and reflect the impact of these parameters on the quality and efficiency of its functioning during the life cycle in real time. Therefore, the paper considers the concept of creating a model of a digital twin of a spindle unit.The introductory part of the article formulates the issues and relevance and analyzes the works that propose approaches to the creation ofdigital twins, in particular, their models. In the main part of the paper, we first propose definitions of the terms digital twin of a spindle unit and its model. The conceptual structure of the digital twin of the spindle unit is presented. A list of characteristics of the model of the digital twin of the spindle unit is defined. The structure of the model of the digital twin of the intelligent spindle unit is determined and the stages of its model creation are given, the tasks to be solved at these stages are specified.It is shown that building a model of a digital twin of a spindle unit has a two-directional character and cannot be con-sidered a fully completed process, since the model of a digital twin of a spindle unit will be constantly refined and updated until the spindle unit is out of service. It is noted that when creating a model of a digital twin of a spindle unit, it is necessary to consider in detail the following key issues: high-precision modeling, model integration, model verification, model con-sistency, mechanisms of functioning and evolution of models.In the conclusions, attention is paid to the unresolved problematic issues that currently exist in the implementation of the model of a digital twin of a spindle unit. The generalized concept of creating a model of a digital twin of an intelligent spindle unit presented in this paper will allow further specifying the content of the stages of creating a digital twin of a spindle unit and forming a methodology for its creation.
Posługi świeckich w liturgii słowa podczas Mszy św. w dziejach Kościoła
Authors: Pałęcki Waldemar
Published: March 2023

Liturgia ze swej natury domaga się zaangażowania wielu osób podczas jej sprawowania. W Konstytucji o liturgii świętej Soboru Watykańskiego II zaznaczono, że: „W odprawianiu liturgii każdy spełniający swą funkcję, czy to duchowny, czy świecki, powinien czynić tylko to i wszystko to, co należy do niego z natury rzeczy i na mocy przepisów liturgicznych” (KL 28). Z perspektywy wielu lat od ogłoszenia konstytucji soborowej zachęta ta jest ciągle aktualna, tym bardziej, że przez wiele wieków celebracja liturgii była sklerykalizowana, a wierni świeccy stali się wyłącznie słuchaczami. Na nowo na posługę podczas liturgii słowa zwrócił uwagę papież Paweł VI w motu proprio Ministeria quaedam, a zwłaszcza papież Franciszek w motu proprio Spiritus Domini, dopuszczając do tej posługi również kobiety.

Celem niniejszego artykułu jest ukazanie znaczenia i roli osób pełniących posługi podczas liturgii słowa we Mszy św. z perspektywy historii liturgii. Począwszy od św. Justyna, poprzez ojców Kościoła, rozporządzenia soborów i synodów przedstawiono miejsce lektorów i psałterzystów pełniących swoją w czasie Mszy św. Podkreślono, że osoby pełniące posługę lektorów w trzech pierwszych wiekach były przede wszystkim osobami świeckimi. Dopiero od papieża Syrycjusza, lektorat stał jednym ze stopni do otrzymania święceń wyższych. W ten sposób doszło do sklerykalizowania pełnienia tej funkcji. Również psałterzystów na Wschodzie dość wcześnie zaliczano do stanu duchownego. Klerykalizację pełnionych funkcji przypieczętował zwyczaj ustanawiania lektorów i psałterzystów w formie święceń. Stan ten został zmieniony dopiero po Soborze Watykańskim II.
Adwent w liturgiach Kościołów syryjskich ze szczególnym uwzględnieniem tradycji zachodnio-syryjskiej
Authors: Potoczny Mateusz R.
Published: March 2023

We wszystkich tradycjach liturgicznych świata chrześcijańskiego Boże Narodzenie poprzedzone jest okresem przygotowania. Z teologicznego punktu widzenia ten okres, Adwent, posiada podwójny wymiar: eschatologiczny oraz nawiązujący do tajemnicy Wcielenia Jezusa Chrystusa. W tradycjach Kościołów syryjskich kolejne niedziele przygotowania do Bożego Narodzenia koncentrują się na przekazanych w Ewangeliach tzw. „zwiastowaniach” (syr: subārā). Niniejszy artykuł stanowi próbę zarysu idei teologicznych obecnych w euchologii adwentowej Kościołów syryjskich.
Prawno-liturgiczne konsekwencje zmiany brzmienia kan. 230 § 1 Kodeksu Prawa Kanonicznego z 1983 roku. Geneza dopuszczenia kobiet do podjęcia na stałe posługi lektoratu i akolitatu w świetle motu proprio Spiritus Domini
Authors: Bartocha Waldemar
Published: March 2023

Artykuł wyjaśnia na czym polega zmiana wprowadzona w kan. 230 § 1 Kodeksu Prawa Kanonicznego z 1983 roku przez papieża Franciszka na mocy motu proprio Spiritus Domini.                            W wyniku tej nowelizacji kobiety zostały dopuszczone do podjęcia na stałe posługi lektora                     i akolity w Kościele rzymskokatolickim. Autor w swoich rozważaniach wychodzi od ukazania istoty reformy święceń niższych, jaką przeprowadził papież Paweł VI wydając list apostolski motu proprio Ministeria guaedam z 15 sierpnia 1972 roku. Następnie omawia kryteria historyczne, teologiczne i pastoralne stojące u podstaw zmiany wprowadzonej                                          w prawodawstwie kodeksowym jeśli chodzi  o realizację liturgicznej posługi lektoratu                                   i akolitatu. Papież Franciszek poprzez motu proprio Spiritus Domini doprowadza do dojrzałości proces reformy rozpoczętej w 1972 roku przez Pawła VI i dokonuje ważnej systematyzacji na płaszczyźnie terminologii oraz w sposób bardziej widoczny uwypukla świecki charakter posług opartych na chrzcie i bierzmowaniu, przeznaczonych do służby kościelnej.
Inside the CVD “Black Box”: A Physics-Driven Exploration of Reactor Conditions during Graphene Growth
Authors: Chatterjee Shahana , Abadie Thomas , Wang Meihui , Matar Omar K. , Ruoff Rodney S.
Published: March 2023

Though more than a decade has passed since the first report of the chemical vapor deposition (CVD) of graphene on metal substrates, the CVD reactor resembles something of a black-box. The process flow conditions, and, temperature and reactant distribution profiles are poorly understood which causes significant repeatability and reproducibility issues. This also affects studies on the growth mechanism of graphene and the synthesis of completely defect free products. To address these challenges, the open source computational fluid dynamics toolbox OpenFOAM is used for the first systematic exploration of reactor conditions for the synthesis of single crystal and single layer graphene (SLG) in a tube reactor that is typically used in the laboratory. It is found that the reactor flow conditions are in the turbulent regime, and, the temperatures of the 50-100 μm thick copper foils on which graphene is grown are not uniform but have large temperature gradients with a sensitivity to the system pressure, the total mass flow rate and the process gas composition that increases with decreasing foil thickness. Furthermore, both the foil and gas temperatures can be manipulated by modifying the mass flow rates of Ar and H2 in the process gas mix. Based on this new-found knowledge, a process window was identified where the amount of Ar gas in the reactor was optimized to mimic cold-wall like conditions inside the hot-wall reactor and that favored the synthesis of pristine SLG films (while hotter reactor conditions produced films with numerous unwanted adlayers).
Latent heat storage using reversible ordering transitions in a metal-organic framework ionic liquid composite
Authors: Nozari Vahid , Azar Ayda , Sajzew Roman , Knebel Alexander , Oschatz Martin , Wondraczek Lothar
Published: March 2023

Composites composed of ionic liquids (ILs) and metal-organic framework (MOF) materials have been proposed for a range of potential applications, including gas separation, ion conduction, and hybrid glass formation. Here, we discover an order transition in an IL@MOF composite using the commodity compounds CuBTC (copper benzene-1,3,5-tricarboxylate) and EMIMTFSI (1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide). This transition absent for the bare MOF or IL provides an extended super-cooling range for latent heat storage at a capacity similar to that of soft paraffins, in the temperature range of ~ 220 C. Structural analysis and in situ monitoring indicate electrostatic interaction of the IL molecules with the Cu paddle-wheels, leading to a decrease in pore symmetry at low temperature. These interactions are released above the transition temperature, what reflects in a reversible volume expansion of the MOF composite on the order of 1 %.
Solvent effects on the chemo- and site-selectivity of transition metal-catalyzed heterogeneous nitrene transfer reactions: Alternatives to chlorinated solvents.
Authors: Ward Robert , Hu Yun , Tu Noah , Schomaker Jennifer
Published: March 2023

Transition metal-catalyzed, non-enzymatic nitrene transfer (NT) reactions that selectively transform C-H and C=C bonds to new C-N bonds represent a powerful strategy to streamline the preparation of valuable amine building blocks. Our group has been engaged in the development of silver-catalyzed NT reactions, where the nature of the ligand can be used to tune the chemo-, site- and enantioselectivity of the amination event in a predictable manner. However, the majority of solvents employed for these reactions are environmentally unfriendly and typically include dichloromethane, chloroform, 1,2-dichloroethane and benzene. In addition, the need for PhIO as the oxidant in our system gives heterogenous mixtures that have limited reaction throughput to date. In this work, a high-throughput experimentation (HTE) protocol for heterogeneous NT reaction mixtures is coupled with the American Chemical Society Pharmaceutical Roundtable (ACSPR) solvent tool to identify suitable replacements for chlorinated solvents and to better understand how the solvent affects chemo- and site-selectivity in NT. Silver catalysts were compared and contrasted other popular catalysts for NT using our HTE protocol, including dinuclear Rh and Fe/Mn phthalocyanine catalysts, to highlight key differences between these systems. Several unexpected solvents were identified that gave both high conversions and selectivities in diverse NT reactions, providing alternatives to traditional chlorinated solvents. We hope these insights will encourage the community to: (1) consider more diverse solvent selections when developing new synthetic methods, (2) employ solvent tools to identify favorable solvent characteristics/parameters and (3) consider SHE impacts in reaction design.
Protecting group-free and 1,2-trans selective glycosylation of carboxylic acids
Authors: Zuo Hao , Zhang Chen , Niu Dawen
Published: March 2023

Here we report a simple and general method to achieve fully unprotected, 1,2-trans- (-) selective glycosylation of carboxylic acids employing allyl glycosyl sulfones as donors. This reaction occurs under ambient temperature and basic conditions under visible light irradiation. The method is stereoconvergent, as allyl glycosyl sulfone donors pass through glycosyl radical intermediates, en route to glycosyl electrophiles. Thanks to the unique radical-based donor activation mechanism, fully unprotected glycosyl donors can be used directly. This transformation displays remarkable substrate scope with respect to both reaction partners. To illustrate its generality and potential utility, a number of commercial drugs and an acid derived from anticancer agent paclitaxel were efficiently glycosylated. Experimental and theoretical studies provide insights into the origin of the stereochemical outcome of this reaction.
Maximization of Hydrogen Peroxide Utilization in PEM H2O2 Electrolyzer for Efficient Power-to-Hydrogen Conversion
Authors: Yang Jie , Ding Ruimin , Liu Chang , Chen Lifang , Wang Qi , Liu Shanshan , Xu Qinchao , Yin Xi
Published: March 2023

The hydrogen peroxide electrolyzer (HPEL) is the workhorse for the energy storage system based on the electrochemical cycle of H2O2. The high H2O2 utilization towards power-to-hydrogen conversion (EH2O2-HER) in the HPEL is essential to ensure the efficiency and cyclability of the system. Unfortunately, the disproportionation of H2O2 at the anode and its crossover to the cathode in a proton exchange membrane (PEM) HPEL is detrimental to H2O2 utilization and must be mitigated. This work investigates the effects of catalyst type, catalyst loading, and membrane thickness on H2O2 utilization in PEM HPEL. The results show that cobalt- and nitrogen-doped carbon (Co-N-C) catalyst exhibits higher H2O2 utilization than the Fe-N-C and Pt/C catalysts due to its higher selectivity towards the hydrogen peroxide oxidation reaction (HPOR) and the lesser H2O2 disproportionation reaction (HPDR). Increasing the loading of the Co-N-C catalyst and membrane thickness can effectively inhibit the H2O2-crossover and improve the H2O2 utilization. On the other hand, the portion of HPDR and the ohmic loss increases with the catalyst loading and membrane thickness, respectively. A maximum H2O2 utilization of over 98% can be achieved by balancing these factors and the cell operating condition. These results provide valuable guides to the catalyst design and device optimization for highly efficient energy storage systems based on the electrochemical H2O2-H2 cycle.
Rational Design of Two-Dimensional Buckled-Hexagonal Nb2S2 Monolayer as an Efficient Anode Material for Ca-ion Batteries: A First-Principles Study
Authors: Chowdhury Somnath , Sen Prasenjit , Gupta Bikash Chandra
Published: March 2023

Presently, great attention is being paid to the search for promising anode materials for metal-ion batteries due to the rapid evolution of numerous modern electronic gadgets. In this investigation, we have predicted for the first time that the buckled-hexagonal Nb2S2 monolayer that may be an efficient anode material for calcium-ion batteries (CIBs). To that objective, we have explored the pristine monolayer system's energetical, dynamical, and thermal stability. The inherent metallicity of the pristine monolayer facilitates its electrical conductivity as an electrode material. Our study also reveals the structural and electrical properties of the Ca-adsorbed Nb2S2 monolayer. It is observed that Ca-atoms prefer to get intercalated on top of the buckled hexagon of the pristine monolayer, and the metallicity of the 2D nanosheet remains preserved. In the adsorption process, bader charge analysis is used to determine the amount of charge transfer from the Ca atom to the Nb2S2 monolayer. Furthermore, this system exhibits a high storage capacity of 1288.86 mAh/g and a moderately low diffusion energy barrier of 0.76 eV. The calculated open-circuit voltage of 0.49 V and the other results suggest that the Nb2S2 monolayer may be a potential candidate for anode material for rechargeable Ca-ion batteries.