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Polacy i Rosjanie we wzajemnej karykaturze 25 IX – 5 X 2007

Agnieszka Królczyk

Pamiętnik Biblioteki Kórnickiej | 2011 | tom 28 | 309

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Authors and Affiliations

Agnieszka Królczyk

Rara z kolekcji Tassila von Heydebrand und der Lasa. 22 X−5 XI 2007

Maria Łuczak

Pamiętnik Biblioteki Kórnickiej | 2011 | tom 28 | 309

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Authors and Affiliations

Maria Łuczak

The verb “dire” as a marker of approximation. = Le verbe "dire" en tant que marqueur d’approximation

Katarzyna Kwapisz-Osadnik

LINGUISTICA SILESIANA | 2019 | vol. 40 | 309-320 | DOI: 10.24425/linsi.2019.129415

Keywords verb dire approximative use exact structure almost structure

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Abstract

The objective of the article is to examine the approximative and adjustive uses of the verb dire, which is mostly regarded as an assertive and eventful verb; hence nonapproximative. Meanwhile, in many expressions, in an impersonal use, in negation when the subjunctive mode is used, in the conditional forms, its evidence value is weakened and the verb dire can express approximation. The study is situated in light of the enunciation theory, notably it refers to a notion of modalisation. The corpus was established on the basis of dictionaries, which are representative for normative uses, but we will refer as well to press texts, particularly interviews, where the verb say is frequently used as a marker of the position of the speaker.

Authors and Affiliations

Katarzyna Kwapisz-Osadnik

Vibration Analysis of a Carbon Nanotube Reinforced Uniform and Tapered Composite Beams

Ananda Babu Arumugam Vasudevan Rajamohan Naresh Bandaru Edwin Sudhagar P. Surajkumar G. Kumbhar

Archives of Acoustics | 2019 | vol. 44 | No 2 | 309-320 | DOI: 10.24425/aoa.2019.128494

Keywords carbon nanotubes uniform and tapered composite beams finite element formulation natural frequency

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Abstract

In this study, free and forced vibration responses of carbon nanotube reinforced uniform and tapered composite beams are investigated. The governing differential equations of motion of a carbon nanotube (CNT) reinforced uniform and tapered composite beams are presented in finite element formulation. The validity of the developed formulation is demonstrated by comparing the natural frequencies evaluated using present FEM with those of available in literature. Various parametric studies are also performed to investigate the effect of aspect ratio, percentage of CNT content, ply orientation, and boundary conditions on natural frequencies and mode shapes of a CNT reinforced composite beam. It was observed that the addition of carbon nanotube in fiber reinforced polymer composite (FRP) beam enhances the stiffness of the structure which consequently increases the natural frequencies and alters the mode shapes.

Authors and Affiliations

Ananda Babu Arumugam

Vasudevan Rajamohan

Naresh Bandaru

Edwin Sudhagar P.

Surajkumar G. Kumbhar

Contents of Chemical and Process Engineering Vol. 41, 2020

Chemical and Process Engineering | 2020 | vol. 41 | No 4 | 309-310

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Measuring Process via Sampling of Signals, and Functions with Attributes

Andrzej Borys

International Journal of Electronics and Telecommunications | 2020 | vol. 66 | No 2 | 309-314 | DOI: 10.24425/ijet.2020.131879

Keywords Measuring process sampling of signals functions with attributes Dirichlet function

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Abstract

In this paper, it has been shown that any measuring process can be modeled as a process of sampling of signals. Also, a notion of a special kind of functions, called here functions with attributes, has been introduced. The starting point here, in the first of the above themes, is an observation that in fact we are not able to measure and record truly continuously in time any physical quantity. The measuring process can be viewed as going stepwise that is in steps from one instant to another, similarly as a sampling of signals proceeds. Therefore, it can be modeled as the latter one. We discuss this in more detail here. And, the notion of functions with attributes, we introduced here, follows in a natural way from the interpretation of both the measuring process as well as the sampling of signals that we present in this paper. It turns out to be useful.

Authors and Affiliations

Andrzej Borys

e-mail:

ORCID:

Optimized Inter Prediction for H.264 Video Codec

T. Bernatin G. Sundari Sahaya Anselin Nisha M.S. Godwin Premi

International Journal of Electronics and Telecommunications | 2021 | vol. 67 | No 2 | 309-314 | DOI: 10.24425/ijet.2021.135981

Keywords H.264 Intra prediction Inter prediction M9K timing synchronization QP

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Abstract

High definition video transmission is one of the prime demands of modern day communication. Changing needs demand diverse features to be offered by the video codec standards, H.264 fits to these requirements for video compression. In this work, an attempt has been made to optimize the inter prediction along with improved intra prediction to ensure the minimal bit rates thereby reduction in the channel bandwidth, which is required in most of the wireless applications. In intraprediction, only DC prediction mode is chosen out of 9 modes with 4*4 luma blocks that reduces the coding complexity towards optimal logic utilization in order to support typical FPGA board for hardware implementation. Most significantly, Inter prediction is carried out utilizing the M9K blocks efficiently with proper timing synchronization to reduce the latency in the encoding operation. Experimental set up comprising of two Altera DE2-115 boards connected through Ethernet cable demonstrated the video transmission. These optimized intra prediction and inter prediction stages resulted in significant improvement in the video compression possessing good subjective quality and increased video compression.

Bibliography

[1] Bernatin.T ,Sundari.G, “ Video compression based on Hybrid transform and quantization with Huffman coding for video codec”, International Conference on Control, Instrumentation, Communication and Computational Technologies (ICCICCT), pp 476-480,IEEE.
[2] The Evolution of H.264 From Codec to System Architecture, White Paper , VBrick Systems, December, 2010
[3] Arun Kumar Pradhan, Lalit Kumar Kanoje and BiswaRanjan Swain, 2013 “FPGA based High Performance CAVLC Implementation for H.264 Video Coding” International Journal of Computer Applications (0975 – 8887) Volume 69– No.10.
[4] Teng Wang, Chih-Kuang Chen, Qi-Hua Yang and Xin-An Wang (2012), “FPGA Implementation and Verification System of H.264/AVC Encoder for HDTV Applications”, Advances in CSIE, Springer-Verlag Berlin Heidelberg, Vol. 2, AISC 169, pp. 345-352
[5] Gwo-Long Li et al. (2013), “135-MHz258-K gates VLSI design for all-intra H.264/AVC scalable video encoder”, IEEE Trans. Very Large Scale Integr.(VLSI) Syst., Vol. 21, No. 4, pp. 636-647
[6] Kuo, H.-C., Wu, L.-C., Huang, H.-T., Hsu, S.-T. and Lin, Y.-L. (2013), “A low power high-performance H.264/AVC intra-frame encoder for 1080pHD video”, IEEE Trans. Very Large Scale Integr. (VLSI) Syst., Vol. 19, No. 6, pp. 925-938

Authors and Affiliations

T. Bernatin

1

G. Sundari

1

Sahaya Anselin Nisha

1

M.S. Godwin Premi

1

Sathyabama Institute of Science and Technology, India

Equine herpesvirus type 1 affects mitochondrial network morphology and reactive oxygen species generation in equine dermal cell line

M. Bartak M. Chodkowski A. Słońska M.W. Bańbura J. Cymerys

Polish Journal of Veterinary Sciences | 2020 | vol. 23 | No 2 | 309-312 | DOI: 10.24425/pjvs.2020.133646

Keywords equine herpesvirus type 1 equine dermal cell line mitochondria reactive oxygen species

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Abstract

In the present study, the influence of the infection with equine herpesvirus type 1 (non-neuropathogenic and neuropathogenic strains of EHV-1) on the morphology and distribution of mitochondrial network in equine dermal cell line was investigated. Our results indicate that EHV-1-infection caused changes in the mitochondrial morphology manifested mostly by fission and reactive oxygen species generation.

Authors and Affiliations

M. Bartak

M. Chodkowski

A. Słońska

M.W. Bańbura

J. Cymerys

Assessment of feline hospitalization environment using a one-way mirror

T. Miyata R. Higuchi K. Yokobori S. Seki K. Ishioka

Polish Journal of Veterinary Sciences | 2023 | vol. 26 | No 2 | 307-309 | DOI: 10.24425/pjvs.2023.145026

Keywords Cat Stress Score hospitalization one-way mirror

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Abstract

A separate, cat-specific hospitalization room away from dogs is recommended to reduce stress in cats; however, this can be difficult for some hospitals to provide. In such cases, measures are undertaken to reduce the cat’s stress by providing a place to hide. However, inability to observe the cat’s condition may be an obstacle to providing veterinary care. The use of a one-way mirror to create a sheltered environment while allowing observation of the cats was assessed. Five healthy cats were assessed using the Cat Stress Score (CSS) while in a cage with either a transparent panel or a one-way mirror. No significant differences in the CSS between the transparent panel and one-way mirror were observed. Variations in the CSS scores depended on the cat’s personality, with friendlier and more sociable cats showing a lower CSS with the one-way mirror. A one-way mirror may be useful to reduce stress in hospitalized cats.

Authors and Affiliations

T. Miyata

1

R. Higuchi

1

K. Yokobori

1

S. Seki

1

K. Ishioka

1

School of Veterinary Nursing and Technology, Faculty of Veterinary Science, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo 180-8602, Japan

Design and Implementation of Intrusion Detection Systems using RPL and AOVD Protocols-based Wireless Sensor Networks

Joseph Kipongo Theo G. Swart Ebenezer Esenogho

International Journal of Electronics and Telecommunications | 2023 | vol. 69 | No 2 | 309-318 | DOI: 10.24425/ijet.2023.144366

Keywords Intrusion Detection Systems wireless sensor networks Cooja simulator sensor nodes NS2

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Abstract

Wireless Sensor Network (WSN) technology has grown in importance in recent years. All WSN implementations need secure data transmission between sensor nodes and base stations. Sensor node attacks introduce new threats to the WSN. As a result, an appropriate Intrusion Detection System (IDS) is required in WSN for defending against security attacks and detecting attacks on sensor nodes. In this study, we use the Routing Protocol for Low Power and Lossy Networks (RPL) for addressing security services in WSN by identifying IDS with a network size of more or less 20 nodes and introducing 10% malicious nodes. The method described above is used on Cooja in the VMware virtual machine Workstation with the InstantContiki2.7 operating system. To track the movement of nodes, find network attacks, and spot dropped packets during IDS in WSN, an algorithm is implemented in the Network Simulator (NS2) using the Ad-hoc On-Demand Distance Vector (AODV) protocol in the Linux operating system.

Authors and Affiliations

Joseph Kipongo

1

Theo G. Swart

1

Ebenezer Esenogho

1 2

Center for Telecommunications, Department of Electrical and Electronic Engineering Science, University of Johannesburg, Johannesburg, South Africa
Department of Electrical and Electronic Engineering, University of Botswana, Gaborone, Botswana

Determination of Vertical Displacements in Relative Monitoring Networks

D. Filipiak-Kowszyk W. Kamiński

Archives of Civil Engineering | Vol. 66 | No 1 | 309-326 | DOI: 10.24425/ace.2020.131790

Keywords vertical displacements unstable reference system a lack of reference points

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Abstract

The problem of determining displacements of objects is an important and current issue, in particular in terms of operational safety. This is a requirement that covers geodetic, periodic control measurements in order to determine horizontal and vertical displacements. The paper is focused on the analysis of vertical displacements. Geodetic measurements and their interpretation allow to reduce the risk of possible structural catastrophes. The major research topic of the majority of available papers is displacement determination of individual controlled points, in a situation where there are identified as fixed reference points. There are cases making identification of such points difficult or impossible to use in displacement analysis. This paper addresses a rare case of determining vertical displacements in unstable reference systems. Due to the fact that most of the existing and known literature methods do not always bring satisfactory results, the paper propose a new method of vertical displacement determination in the absence of reference points in the local coordinate system. Practical considerations on simulated data show that the presented method performs the task correctly.

Authors and Affiliations

D. Filipiak-Kowszyk

W. Kamiński

Between Analogy and Language Contact: A Case Study of Grammatical Change in Maghrebi Judaeo-Arabic Dialects

Wiktor Gębski

Folia Orientalia | 2023 | vol. 60 | 277-309 | DOI: 10.24425/for.2023.148426

Keywords analogy Judaeo-Arabic Maghreb syntax morphology language contact

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Abstract

Analogy and language contact represent endogenous and exogenous factors of language change. Although both processes have been discussed in the realm of Arabic dialectology, they are usually treated as two unrelated scenarios. The central question that this study posits is whether those are two functionally independent phenomena, or they can operate synergetically. The primary focus of this paper is two typologically distinct Jewish dialects, i.e. sedentary Gabes (Southern Tunisia), and exhibiting numerous Bedouin features Wad-Souf (Eastern Algeria). Based on new data obtained from fieldwork, this paper accounts for five cases of grammar evolution within verb morphology and syntax through the lens of analogy and language contact. It raises the possibility that under certain circumstances, language change can occur at the intersection of endogenous and exogenous factors.

Authors and Affiliations

Wiktor Gębski

1

e-mail:

ORCID:

University of Cambridge, United Kingdom

A study of landslide body control of black bovine cave copper ore mining and beneficiation project

Hanhui Wu

Archives of Civil Engineering | 2023 | vol. 69 | No 2 | 291-309 | DOI: 10.24425/ace.2023.145268

Keywords black bovine cave copper ore landslide body stability analysis control scheme

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Abstract

Landslide is a common geological disaster which causes huge losses to people’s properties and national economic development. How to prevent and control landslides has become an important issue. This article introduces the geological and geographical environment of the landslide body, analyzes the basic characteristics of the landslide, calculates the landslide stability based on the ultimate equilibrium theory-based transfer coefficient method, discusses the development trend of the landslide and comes up with corresponding control schemes by taking the landslide body of Black Bovine Cave Copper Ore Mining & Beneficiation Project as example. It is found that the control scheme – “anti-slide pile + retraining wall + baffle + anchor cable” can be used to effectively prevent and control the geological disaster according to calculation. The study results can provide a reference for landslide body control.

Authors and Affiliations

Hanhui Wu

1

e-mail:

ORCID:

Civil Engineering, School of Civil Engineering, Chongqing Chemical Industry Vocational College, 400020 Chongqing, China

Hidden capital as an alternative method for increasing punching shear resistance of LWCA flat slabs

M. Gołdyn T. Urban

Archives of Civil Engineering | 2019 | Vol. 65 | No 4 | 309-328

Keywords lightweight aggregate concrete fibre reinforced concrete punching shear capital sintered fly ash

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Abstract

In the paper an alternative method for increasing punching shear resistance of the flat slabs from lightweight aggregate concrete by means of hidden steel fibre reinforced capital was presented. Previous experimental studies demonstrated that the addition of steel fibres to concrete allows for increase in the punching shear resistance of flat slab. Steel fibres modify the tensile strength of concrete, which translates into increased ductility of the material. The results of the experimental investigations were presented, the aim of which was to assess the effectiveness of the proposed solution. For economic and technological reasons, a hidden capital of a height equal to half of the slabs depth was made so that the top reinforcement could be installed later. It was found that presented solution allowed to increase the load carrying capacity by about 36% with respect to the control element, made entirely of lightweight aggregate concrete.

Authors and Affiliations

M. Gołdyn

T. Urban

Shaping of spatial steel rod structures based on a hyperbolic paraboloid

J. Dzwierzynska

Archives of Civil Engineering | 2018 | Vol. 64 | No 4/II | 309-320

Keywords parametric modeling structural analysis optimization Grasshopper Karamba 3D hyperbolic paraboloid rod structure ruled surface

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Abstract

The aim of the study was to develop a practical approach to parametric shaping of spatial steel rod structures formed based on a hyperbolic paraboloid. This design approach was realized by application of designing tools working in environment of Rhinoceros 3D, that is its plug-in Grasshopper for geometric modelling and Karamba 3D for structural analysis. The goal of this research was to elaborate an universal scripts in order to create rod structures‘ models of various forms and grid patterns, as well as evaluating their structural behaviour dependently on various boundary conditions. The optimisation criterion was the minimum mass and deflection. Several proposals of coverings by means of single layer grid structures were presented and analysed to choose the best solution. The rod structures generated based on a hyperbolic paraboloid turned out to be structures with good static properties, so may be an interesting proposals to cover large areas.

Authors and Affiliations

J. Dzwierzynska

Analysis of steel frame under selected accidental situation

Damian Kukla Aleksander Kozlowski

Archives of Civil Engineering | 2022 | vol. 68 | No 4 | 293-309 | DOI: 10.24425/ace.2022.143039

Keywords FEA dynamic analysis steel end-plate bolted joints accidental situation column loss robustness

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Abstract

The current design codes recommend designing the building structures based on the assumption avoiding the disproportionate to the initial cause damage during accidental situation. As a main strategy to mitigate a progressive collapse an alternative load path method is recommended. Flush and extended bolted end-plate joint to connect beam-to-column were experimentally tested. Hierarchical validation of joint FEM models based on experimental test results were performed. The numerical dynamic analysis by finite element method of selected steel frame under column loss scenario is presented. The planar 2D model of frame were used. Shell elements for beams and columns and solid elements for joints were employed respectively. Nonlinear material and geometry were applied in the analysis. Johnson-Cook model was used to describe the change of steel parameters by dynamic Increase Factor (DIF). The Rayleigh model to include the damping effects in the analysis was used. The dynamic analysis was performed with the use of Abaqus/Explicit module. Main conclusion of presented research it that to achieve the required level of robustness, bolted beam-to-column joints with extended end-plate of thickness more than 15 mm should be used.

Authors and Affiliations

Damian Kukla

1

e-mail:

ORCID:

Aleksander Kozlowski

1

e-mail:

ORCID:

Rzeszów University of Technology, Faculty of Civil and Environmental Engineering and Architecture, Poznanska 2, 35-084 Rzeszów, Poland

Impact of decision model structure on the selection of a telecommunications tower footing reinforcement alternative

Bartłomiej Szewczyk Grzegorz Śladowski Kamil Ratoń

Archives of Civil Engineering | 2021 | vol. 67 | No 2 | 309-321 | DOI: 10.24425/ace.2021.137170

Keywords MCDA (Multi-Criteria Decision Analysis) AHP (Analytical Hierarchy Process) ANP (Analytical Network Process) civil engineering footing reinforcement

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Abstract

In recent years, we have been able to observe a dynamic development of MCDA (multi-criteria decision analysis) methods, which have become widely used in various sectors, including construction. These methods are characterised by simplicity and one of their key advantages is their simple modelling of non-linear dependencies within decision problems and their analysis under the conditions of incomplete, uncertain and hard-to-measure information. The universality and simple use of these methods does not, however, free the decision-maker from the necessity to adopt the proper approach to modelling and analysing specific decision problems. To highlight the fact that it is the character of the problem that should determine the selection of the method of analysing it and not the other way around, the authors assessed the AHP (Analytic Hierarchy Process) and the ANP (Analytic Network Process) method in terms of verifying the impact of the different decision model structures on analysis outcomes and analysed their sensitivity to input data changes. This analysis was based on the example of selecting a telecommunications tower footing reinforcement alternative. The findings confirmed the significant impact of decision model structure on the ranking of the analysed alternatives.

Authors and Affiliations

Bartłomiej Szewczyk

1

e-mail:

ORCID:

Grzegorz Śladowski

1

e-mail:

ORCID:

Kamil Ratoń

2

e-mail:

ORCID:

PhD., Eng., Cracow University of Technology, Faculty of Civil Engineering, 24 Warszawska Street, 31-155 Cracow, Poland
MSc., Eng., PIB Constructor, 100/104 Balicka Street, 30-149 Cracow, Poland

Edible insects as a source of dietary protein for companion animals with food responsive enteropathies – perspectives and possibilities

R. Gałęcki M. Hanuszewska-Dominiak E. Kaczmar

Polish Journal of Veterinary Sciences | 2024 | vol. 27 | No 2 | 309-318 | DOI: 10.24425/pjvs.2024.149361

Keywords chronic enteropathies (CE) edible insects edible insect industry food-responsiveenteropathies (FRE) veterinary diets veterinary medicine

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Abstract

The incidence of chronic enteropathies (CE), in particular food-responsive enteropathies (FRE) in dogs, is on the rise in veterinary practice. The symptoms of these digestive disorders cannot be alleviated with the use of commercial hypoallergenic feeds. The applicability of novel materials in hypoallergenic dog feeds is limited, and edible insects could pose a viable alternative. Insects have a high nutritional value, and their potential can be harnessed to design personalized nutrition strategies. However, the use of insects in animal feeds should be rigorously tested. The aim of this study was to analyze the applicability of edible insects as a source of dietary protein for companion animals, including the current and future prospects. Canine food formulas should be evaluated in a clinical setting. The role edible insects in pet diets and the efficacy of this material in animal nutrition should be examined in advanced clinical trials in gastroenterology, histology, immunology, and microbiology. These efforts are required to guarantee the safety and efficacy of innovative insect-based feeds and to increase their popularity among veterinary practitioners, pet food producers, and animal owners.

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Authors and Affiliations

R. Gałęcki

1

M. Hanuszewska-Dominiak

2

E. Kaczmar

3

Department of Veterinary Prevention and Feed Hygiene, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, Oczapowskiego 13, 10-719 Olsztyn, Poland
Department of Histology and Embryology, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, Oczapowskiego 13, 10-719 Olsztyn, Poland
Department of Clinical Diagnostics, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, Oczapowskiego 13, 10-719 Olsztyn, Poland

Application of iterative learning control for ripple torque compensation in PMSM drive

Adrian Wójcik Tomasz Pajchrowski

Archives of Electrical Engineering | 2019 | vol. 68 | No 2 | 309-324 | DOI: 10.24425/aee.2019.128270

Keywords ripple torque iterative learning control artificial neural network permanent magnet synchronous motor

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Abstract

The aim of the studywas to find an effective method of ripple torque compensation for a direct drive with a permanent magnet synchronous motor (PMSM) without time-consuming drive identification. The main objective of the research on the development of a methodology for the proper teaching a neural network was achieved by the use of iterative learning control (ILC), correct estimation of torque and spline interpolation. The paper presents the structure of the drive system and the method of its tuning in order to reduce the torque ripple, which has a significant effect on the uneven speed of the servo drive. The proposed structure of the PMSM in the dq axis is equipped with a neural compensator. The introduced iterative learning control was based on the estimation of the ripple torque and spline interpolation. The structurewas analyzed and verified by simulation and experimental tests. The elaborated structure of the drive system and method of its tuning can be easily used by applying a microprocessor system available now on the market. The proposed control solution can be made without time-consuming drive identification, which can have a great practical advantage. The article presents a new approach to proper neural network training in cooperation with iterative learning for repetitive motion systems without time-consuming identification of the motor.

Authors and Affiliations

Adrian Wójcik

Tomasz Pajchrowski

Effects of cooling methods and key parameters on the cooling performance of oil-cooling motor with hairpin windings

Y.X. Liu H. Wu J. Zhang P.X. Xu S. Chen X.H. He Z.D. Sun

Archives of Thermodynamics | 2024 | vol. 45 | No 2 | 301-309 | DOI: 10.24425/ather.2024.150874

Keywords Hairpin winding Electromagnetic-thermal coupling Permanent magnet synchronous motors Cooling performance Oil spray cooling

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Abstract

Based on the electromagnetic thermal coupling analysis method, the cooling performance of different motor cooling models and the influence of key parameters of the cooling system on the cooling effect of the motor are investigated. First, the losses of various parts of the permanent magnet synchronous motors are obtained through electromagnetic calculations; the analysis results show that the stator core loss, winding copper loss, and eddy current loss of permanent magnets exceed 95% of the total loss of the motor. Second, the cooling performance of the three motor was compared and analyzed. The axial housing liquid cooling and oil spray cooling (Model B) has a better cooling performance and a higher cooling efficiency. Compared with the other two motor models, Model B can reduce the time to reach steady-state temperature by about 81.8%.Then the effects of coolant volume flow rate, coolant inlet temperature, and ambient temperature on the cooling effect of the motor are investi-gated. The results show that within a certain range, the rate of coolant inlet temperature change is approximately proportional to the internal temperature rise of the motor. The oil spray cooling system of Model B is less affected by ambient temperature and can be used for motor cooling in complex environments. The results of this study can provide a useful guidance for the design of the cooling system and the selection of coolant volume flow rate for oil-cooling motor with hairpin windings.

Authors and Affiliations

Y.X. Liu

1

H. Wu

2

J. Zhang

2

P.X. Xu

3

S. Chen

3

X.H. He

1

Z.D. Sun

4

School of Smart Health, Chongqing College of Electronic Engineering, Chongqing, 401331, China
Department of Technology, Chongqing Tsingshan Industrial Co. Ltd., Chongqing, 402776, China
College of Mechanical Engineering, Chongqing University of Technology, Chongqing 400044, China
Hubei University of Automotive Technology, Shiyan Hubei, 442002, China

Refined multi-phase-lags theory and Thomson effect on a micropolar thermoelastic medium with voids

Amnah M. Alharbi Elsayed M. Abd-Elaziz Mohamed I.A. Othman

Archives of Thermodynamics | 2021 | vol. 42 | No 3 | 279-309 | DOI: 10.24425/ather.2021.138120

Keywords Micropolar Voids Refined-phase-lags theory Thomson effect Normal mode analysis

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Abstract

The problem considered is that of an isotropic, micropolar thermoelastic medium with voids subjected to the Thomson effect. The solution to the problem is presented in the context of the refined multiphase- lags theory of thermoelasticity. The normal mode analysis was used to obtain the analytical expressions of the considered variables. The nondimensional displacement, temperature, microrotation, the change in the volume fraction field and stress of the material are obtained and illustrated graphically. The variations of these quantities have been depicted graphically in the refined-phase-lag theory, Green and Naghdi theory of type II, Lord and Shulman theory and a coupled theory. The effects of the Thomson parameter and phase lag parameters on a homogeneous, isotropic, micropolar thermoelastic material with voids are revealed and discussed. Some particular cases of interest are deduced from the present investigation.

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Authors and Affiliations

Amnah M. Alharbi

1

Elsayed M. Abd-Elaziz

2

Mohamed I.A. Othman

3

Taif University, Department of Mathematics, College of Science, P.O. Box 11099, Taif, 21944, Saudi Arabia
Ministry of Higher Education, Zagazig Higher Institute of Engineering & Technology, Zagazig, Egypt
Zagazig University, Department of Mathematics, Faculty of Science, P.O. Box 44519, Zagazig, Egypt

Static liquefaction as a form of material instability in element test simulations of granular soil

Krzysztof Sternik

Archives of Civil Engineering | 2024 | vol. 70 | No 2 | 309-322 | DOI: 10.24425/ace.2024.149865

Keywords constitutive model element test numerical simulation static liquefaction

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Abstract

Static liquefaction is a form of unstable behaviour of granular soil. It is most common in saturated loose sands under monotonically loaded undrained conditions. Predicting static liquefaction using an elastic-plastic model that incorporates the non-associated plastic flow rule and strain hardening is possible. The article briefly describes the unstable behaviour of saturated sand in undrained conditions under a monotonic load. A simple elastic-plastic model with deviatoric hardening and a Drucker–Prager load surface is presented. The constitutive relationships were programmed in a Python script. Simulations of triaxial tests under mixed stress-strain control demonstrated the model’s ability to predict various undrained sand responses, including fully stable responses (no liquefaction) and partial and complete liquefaction under triaxial compression and tension. Predicting static liquefaction is possible by properly selecting the proportions of the parameters involved in plastic potential and loading functions and the parameter A used in the deviatoric hardening rule of hyperbolic type.

Authors and Affiliations

Krzysztof Sternik

1

e-mail:

ORCID:

Silesian University of Technology, Faculty of Civil Engineering, ul. Akademicka 5, 44-100 Gliwice,Poland

Application of Glued Laminated Timber Structures in Office Buildings

Aleksander Janicki

Teka Komisji Urbanistyki i Architektury Oddziału Polskiej Akademii Nauk w Krakowie | 2022 | vol. L | 295-309 | DOI: 10.24425/tkuia.2022.144854

Keywords carbon dioxide emissions sustainable construction glued laminated timber office building

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Abstract

Due to the ongoing climate change, the issues currently in focus are the reduction of CO2 emissions into the atmosphere and sustainable construction. The search for ecological alternatives to traditional building structures that will reduce a building’s carbon footprint seems to be a desirable direction of modern construction development. At present, the first projects of office buildings that use cross-laminated timber as the main construction material are being completed, which can have a positive impact not only on the environment but also on the users of the building.

Authors and Affiliations

Aleksander Janicki

1

e-mail:

ORCID:

Cracow University of Technology, Faculty of Architecture

Social assistance or agency? Attachment Styles Moderate the Impact of Control Threat on Social Relationship Preferences

Agata Gasiorowska Tomasz Zaleskiewicz

Polish Psychological Bulletin | 2023 | vol. 54 | No 4 | 309-317 | DOI: 10.24425/ppb.2023.148849

Keywords social relations agency control threat attachment anxiety attachment avoidance

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Abstract

Building upon Gasiorowska and Zaleskiewicz's (2021, 2023), we explored how a control threat and attachment style influence social relationship preferences. This experiment aimed to investigate how experiencing a control threat affects individuals with secure, anxious, and avoidant attachment patterns when they can choose between seeking assistance from the market, asking a close person for help, or coping with the situation alone. Participants with different attachment styles were randomly assigned to either the lack of control condition ( n = 290) or the having control condition ( n = 277). Individuals with an anxious attachment were more inclined to choose the market-exchange option and less likely to select the agentic and communal options when faced with a control threat. Meanwhile, those with an avoidant attachment exhibited a higher tendency to choose the agentic option, while their preference for noncontingent help decreased after exposure to the control threat. Surprisingly, secure attachment individuals showed an increased preference for noncontingent help and decreased preferences for market exchange and self-reliance when exposed to the control threat compared to when they had control. These findings suggest that participation in market relationships may meet vital psychological needs and serve as a safeguard against attachment insecurities.

Authors and Affiliations

Agata Gasiorowska

1

e-mail:

ORCID:

Tomasz Zaleskiewicz

1

e-mail:

ORCID:

SWPS University SWPS University, Wrocław, Poland

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3

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