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    Wyświetlanie 1-9 z 9
    Tytuł:
    Manufacturing of thin-walled, complex polymer parts by DLP printing – the influence of process parameters on crosslinking density
    Autorzy:
    Tomczak, Dorota
    Wichniarek, Radosław
    Kuczko, Wiesław
    Górski, Filip
    Powiązania:
    https://bibliotekanauki.pl/articles/27311462.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    additive manufacturing
    DLP
    acrylic resin
    crosslinking density
    FTIR-ATR
    data loss prevention
    produkcja dodatkowa
    gęstość sieciowania
    żywica akrylowa
    system zapobiegania utracie danych
    Opis:
    This study investigated the relationship between the parameters of the DLP manufacturing process and the structure of photopolymerizable acrylic resins. Four different process parameters were established to produce different thin-walled acrylic sample series: exposure time, layer thickness, area offset, and number of transition layers. The structure and the surface of the obtained samples were examined with the use of the FTIR–ATR method and an optical microscope, respectively. It was proved that extension of the exposure time increases the density of crosslinking and sample thickness. A decreasing crosslinking density due to rising layer thickness is observed. The area offset affects only the dimensions of the sample, predictably reducing the dimensions of the sample as the compensation increases. The absence of transition layers proved unfavorable in many respects, both structurally and geometrically.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 4; art. no. e145936
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A data assimilation approach for estimating strength of steel pipes reinforced with composite sleeves under unsteady pressure-flow conditions
    Autorzy:
    Witek, Maciej
    Uilhoorn, Ferdinand
    Powiązania:
    https://bibliotekanauki.pl/articles/1845453.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pipe wall metal loss
    composite sleeve
    pipe fracture
    gas dynamics
    data assimilation
    Opis:
    The aim of this paper is twofold: to estimate the unsteady pressure-flow variations in gas transmission pipelines using the ensemblebased data assimilation approach and to analyse the strength of steel tubes reinforced with composite sleeves containing localized part-wall thickness loss caused by corrosion while taking into consideration a safe operating pressure of the pipeline. For a steel thin-walled cylinder containing a partwall metal loss, a flexible wrap of fibreglass as well as carbon glass with epoxy resin are determined. The strength of the repaired pipeline with two kinds of materials for sleeves is investigated taking into consideration the internal pressure at the defect location. For the case study, a section of the Yamal transit pipeline on the Polish territory is selected. The results enable pipeline operators to evaluate the strength of corroded steel pipelines and develop optimal repair activities, which are of vital importance for the maintenance and operation of underground steel networks.
    Źródło:
    Archives of Thermodynamics; 2020, 41, 4; 3-22
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A data assimilation approach for estimating strength of steel pipes reinforced with composite sleeves under unsteady pressure-flow conditions
    Autorzy:
    Witek, Maciej
    Uilhoorn, Ferdinand
    Powiązania:
    https://bibliotekanauki.pl/articles/1845456.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pipe wall metal loss
    composite sleeve
    pipe fracture
    gas dynamics
    data assimilation
    Opis:
    The aim of this paper is twofold: to estimate the unsteady pressure-flow variations in gas transmission pipelines using the ensemblebased data assimilation approach and to analyse the strength of steel tubes reinforced with composite sleeves containing localized part-wall thickness loss caused by corrosion while taking into consideration a safe operating pressure of the pipeline. For a steel thin-walled cylinder containing a partwall metal loss, a flexible wrap of fibreglass as well as carbon glass with epoxy resin are determined. The strength of the repaired pipeline with two kinds of materials for sleeves is investigated taking into consideration the internal pressure at the defect location. For the case study, a section of the Yamal transit pipeline on the Polish territory is selected. The results enable pipeline operators to evaluate the strength of corroded steel pipelines and develop optimal repair activities, which are of vital importance for the maintenance and operation of underground steel networks.
    Źródło:
    Archives of Thermodynamics; 2020, 41, 4; 3-22
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A strong and efficient baseline for vehicle re-identification using deep triplet embedding
    Autorzy:
    Kumar, Ratnesh
    Weill, Edwin
    Aghdasi, Farzin
    Sriram, Parthasarathy
    Powiązania:
    https://bibliotekanauki.pl/articles/91741.pdf
    Data publikacji:
    2020
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    convolutional neural networks
    re-identification
    triplet networks
    siamese networks
    embedding
    hard data mining
    contrastive loss
    konwolucyjne sieci neuronowe
    sieci triplet
    sieci syjamskie
    osadzanie
    eksploracja danych
    Opis:
    In this paper we tackle the problem of vehicle re-identification in a camera network utilizing triplet embeddings. Re-identification is the problem of matching appearances of objects across different cameras. With the proliferation of surveillance cameras enabling smart and safer cities, there is an ever-increasing need to re-identify vehicles across cameras. Typical challenges arising in smart city scenarios include variations of viewpoints, illumination and self occlusions. Most successful approaches for re-identification involve (deep) learning an embedding space such that the vehicles of same identities are projected closer to one another, compared to the vehicles representing different identities. Popular loss functions for learning an embedding (space) include contrastive or triplet loss. In this paper we provide an extensive evaluation of triplet loss applied to vehicle re-identification and demonstrate that using the recently proposed sampling approaches for mining informative data points outperform most of the existing state-of-the-art approaches for vehicle re-identification. Compared to most existing state-of-the-art approaches, our approach is simpler and more straightforward for training utilizing only identity-level annotations, along with one of the smallest published embedding dimensions for efficient inference. Furthermore in this work we introduce a formal evaluation of a triplet sampling variant (batch sample) into the re-identification literature. In addition to the conference version [24], this submission adds extensive experiments on new released datasets, cross domain evaluations and ablation studies.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2020, 10, 1; 27-45
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integer Matrix Keys for Secure Data Aggregation in Clustered Wireless Sensor Networks
    Autorzy:
    Chethana, G.
    Padmaja, K.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1844481.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    loss-less data aggregation
    integer matrices as keys
    finite field Zp
    homomorphic aggregation
    Opis:
    Providing Privacy and security for aggregated data in wireless sensor networks has drawn the attention of practicing engineers and researchers globally. Several cryptographic methods have been already proposed to solve security and data integrity problems for aggregated data. Matrix cryptography is a better option for creating secure encryption/decryption algorithms to counter quantum attack. However, these algorithms have higher computational cost and increased communication overhead. Hence, a new technique of loss-less secure data aggregation in Clustered Wireless Sensor Networks is presented. The proposed method uses integer matrices as keys for data security and data integrity. Matrix operations are carried out in finite field Zp. Loss-less secure data aggregation is extended for homomorphic summation while the cipher text expansion ratio is kept substantially low. The proposed algorithm has inbuilt fast and efficient signature verification facility. The execution time of our signature verification mechanism is found to be approximately 50 percent less compared to a couple of standard existing signature verification schemes.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 4; 637-645
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi objective Flower Pollination Algorithm for solving capacitor placement in radial distribution system using data structure load flow analysis
    Autorzy:
    Tamilselvan, V.
    Jayabarathi, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/140691.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Flower Pollination Algorithm
    data structure
    loss minimization
    voltage improvement
    capacitor placement
    Opis:
    The radial distribution system is a rugged system, it is also the most commonly used system, which suffers by loss and low voltage at the end bus. This loss can be reduced by the use of a capacitor in the system, which injects reactive current and also improves the voltage magnitude in the buses. The real power loss in the distribution line is the I2R loss which depends on the current and resistance. The connection of the capacitor in the bus reduces the reactive current and losses. The loss reduction is equal to the increase in generation, necessary for the electric power provided by firms. For consumers, the quality of power supply depends on the voltage magnitude level, which is also considered and hence the objective of the problem becomes the multi objective of loss minimization and the minimization of voltage deviation. In this paper, the optimal location and size of the capacitor is found using a new computational intelligent algorithm called Flower Pollination Algorithm (FPA). To calculate the power flow and losses in the system, novel data structure load flow is introduced. In this, each bus is considered as a node with bus associated data. Links between the nodes are distribution lines and their own resistance and reactance. To validate the developed FPA solutions standard test cases, IEEE 33 and IEEE 69 radial distribution systems are considered.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 2; 203-220
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simplified risk assessment of noise induced hearing loss by means of 2 spreadsheet models
    Autorzy:
    Lie, Arve
    Engdahl, Bo
    Tambs, Kristian
    Powiązania:
    https://bibliotekanauki.pl/articles/2168390.pdf
    Data publikacji:
    2016-11-18
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    method
    risk assessment
    occupational health services
    noise induced hearing loss
    spread sheet
    reference data ISO
    Opis:
    Objectives The objective of this study has been to test 2 spreadsheet models to compare the observed with the expected hearing loss for a Norwegian reference population. Material and Methods The prevalence rates of the Norwegian and the National Institute for Occupational Safety and Health (NIOSH) definitions of hearing outcomes were calculated in terms of sex and age, 20–64 years old, for a screened (with no occupational noise exposure) (N = 18 858) and unscreened (N = 38 333) Norwegian reference population from the Nord-Trøndelag Hearing Loss Study (NTHLS). Based on the prevalence rates, 2 different spreadsheet models were constructed in order to compare the prevalence rates of various groups of workers with the expected rates. The spreadsheets were then tested on 10 different occupational groups with varying degrees of hearing loss as compared to a reference population. Results Hearing of office workers, train drivers, conductors and teachers differed little from the screened reference values based on the Norwegian and the NIOSH criterion. The construction workers, miners, farmers and military had an impaired hearing and railway maintenance workers and bus drivers had a mildly impaired hearing. The spreadsheet models give a valid assessment of the hearing loss. Conclusions The use of spreadsheet models to compare hearing in occupational groups with that of a reference population is a simple and quick method. The results are in line with comparable hearing thresholds, and allow for significance testing. The method is believed to be useful for occupational health services in the assessment of risk of noise induced hearing loss (NIHL) and the preventive potential in groups of noise-exposed workers. Int J Occup Med Environ Health 2016;29(6):991–999
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2016, 29, 6; 991-999
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody odzyskiwania i kasowania danych z nośników magnetycznych i nośników pamięci flash
    Deleting and recovering data stored on magnetic or flash media
    Autorzy:
    Gruber, J.
    Jóźwiak, I.
    Kowalczyk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/324605.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    data loss
    data recovery programs
    data deleting and erasure
    destruction of media data
    utrata danych
    program odzyskiwania danych
    kasowanie danych
    niszczenie nośników danych
    Opis:
    Gdy nastąpi uszkodzenie nośnika danych, większość danych można odzyskać za pomocą jednego z wielu programów narzędziowych do odzyskiwania danych. Z drugiej strony, gdy na nośnikach danych przechowywane są dane poufne, to po uszkodzeniu danych lub po awarii nośników danych dane należy z tych nośników skutecznie skasować za pomocą specjalnych programów narzędziowych, a nośniki trzeba zwykle również zniszczyć fizycznie, uniemożliwiając ewentualne próby odzyskania z nich poufnych danych. W artykule porównano programy narzędziowe odzyskiwania i kasowania danych, a także sposoby niszczenia nośników danych.
    When media data is damaged, most of the data can be recovered using one of the many utilities for data recovery. On the other hand, when the media data is stored sensitive or secret data, after data corruption or data storage media failure should the media to effectively erase using special utilities and carriers must usually also destroy physically impossible any attempt to recover from their confidential data. In this article we performed a comparison of utilities and recovery, and deleting data, as well as methods of physical destruction of storage media
    Źródło:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2014, 74; 35-44
    1641-3466
    Pojawia się w:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie pakietu NVivo w analizie materiałów nieustrukturyzowanych
    Computer Aided Qualitative Research Using NVivo in unstructured data analysis
    Autorzy:
    Brosz, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/1373761.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    CAQDAS
    loss of information
    data reduction
    coding procedures
    NVivo
    grounded theory
    Opis:
    This paper concerns using NVivo software in qualitative data analysis. Main subject refers to the data reduction accompanying the process of qualitative data analysis. Using software does not necessarily cause the uncontrolled modifications of data, thereby, the loss of relevant aspects of collected data. The latest version of CAQDAS (i.e., NVivo 8, 9) enables the possibility of coding on barely altered so¬urces. The paper presents examples of coding procedures on texts, pictures, audio-visual recordings. Additionally, the paper includes description of some techniques aiding the coding process.
    Źródło:
    Przegląd Socjologii Jakościowej; 2012, 8, 1; 98-125
    1733-8069
    Pojawia się w:
    Przegląd Socjologii Jakościowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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