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Tytuł:
Study on pressure relief mechanism of hydraulic support in working face under directional roof crack
Autorzy:
Zhang, Jun
Liu, Jianning
Wang, Yajun
Yang, Gang
Hou, Shilin
Wang, Yuanjun
He, Manchao
Yang, Jun
Tematy:
ciśnienie hydrauliczne
wydobycie węgla
podpora hydrauliczna
directional roof crack
pressure relief mechanism
main roof
hydraulic support pressure
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Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:
https://bibliotekanauki.pl/articles/59111434.pdf  Link otwiera się w nowym oknie
Opis:
When mining coal from the working face, the main roof withstands the overlying strata. The main roof’s first weighting and periodic weighting may cause accidents, such as crushing the working face hydraulic supports. A mechanical model of the main roof was constructed, and the contributing factors of first and periodic weights on the main roof were examined in order to prevent such accidents. The thickness of the main roof was found as the most contributory factor to the main roof’s stability. Therefore, a new directional roof crack (DRC) technique is proposed, which produces directional cracks in the main roof through directional blasting and makes part of it collapse in advance so as to reduce the thickness and relieve the first and periodic weighting. To verify the effectiveness of DRC, the mechanism of DRC was analysed. A mechanical model of the hydraulic support was constructed, and the DRC techniques were tested on-site. Field experiments with a complete set of monitoring schemes showed that, with DRC technology, the roof periodic weighting interval decreased by 35.36%, and the hydraulic support pressure decreased by 17.56%. The theoretical analysis was consistent with the measured results. Therefore, the DRC technology is feasible and effective to ensure mining safety at the working face.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation on microstructure evolution and creep behaviour of red sandstone at elevated temperature
Autorzy:
Yang, Puchao
Wen, Jun
Wenan, Xie
Dai, Gang
Yang, Xiuting
Tematy:
obróbka termiczna
czerwony piaskowiec
rezonans magnetyczny
analiza wrażliwości
temperature treatment
red sandstone
creep behaviour
nuclear magnetic resonance (NMR)
sensitivity analysis
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Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:
https://bibliotekanauki.pl/articles/59111343.pdf  Link otwiera się w nowym oknie
Opis:
The changes in the physical and mechanical properties of rocks under high temperatures can impact the construction safety and stability of underground geotechnical engineering. This study focuses on red sandstone treated at different temperatures, employing nuclear magnetic resonance (NMR) spectroscopy to reveal alterations in the internal pore distribution due to elevated temperatures. The results indicate that high temperatures lead to the formation of micro- to meso scale pores and macro-scale pores and cracks. Additionally, high temperatures cause a significant reduction in load-bearing capacity, accompanied by changes in creep behaviour, including a shortened steady-state creep time and an increased strain threshold for rock failure. To more accurately describe the creep behaviour of red sandstone under different temperatures and stress conditions, a novel non-constant creep model is proposed, combining a generalised Kelvin body and a fractional viscoplastic body to demonstrate its versatility in elastic, viscoelastic, and viscoplastic deformation. The model parameters are determined through numerical optimisation, and the model’s reliability is confirmed by comparing theoretical curves with experimental data. Sensitivity analysis highlights the critical roles of parameters such as shear modulus, viscosity coefficient, fractional order, and characteristic parameters in capturing various creep patterns, emphasising the model’s wide applicability. This research provides profound insights into the physical and mechanical responses of red sandstone to high temperatures and offers valuable information for engineering and geological applications in relevant fields.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Praktyki w zakresie mikroinnowacji w przedsiębiorstwach chińskich – cechy, typy i determinanty
The Practices of Micro-Innovation in Chinese Enterprises: Traits, Types and Affecting Factors
Autorzy:
Zhou, Qing
Yang, Wei
Ma, Xiangyuan
Fang, Gang
Tematy:
micro-innovation
basic types
affecting factors
empirical research
mikroinnowacje
podstawowe typy
determinanty
badania empiryczne
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Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Powiązania:
https://bibliotekanauki.pl/articles/1810847.pdf  Link otwiera się w nowym oknie
Opis:
Mikroinnowacje, jako rodzaj innowacyjnego sposobu myślenia i proces innowacyjny, można podzielić na mikroinnowacje ciągłe, imitacyjne i niezależne. Podział ten oparty jest na wymiarach innowacyjności, zakłóceń rynku i powtarzalności w dziedzinie innowacji. Na podstawie badań teoretycznych i empirycznych w artykule dokonano analizy wpływu głównych determinant mikroinnowacji na kształtowanie ich typów. Determinanty te, do których należą zasoby produktywne, zasoby zarządcze i ograniczenia zewnętrzne, wywierają bardziej znaczący wpływ na mikroinnowacje imitacyjne, a jednocześnie wykazują mniejszą korelację z mikroinnowacjami niezależnymi i ciągłymi. Wdrażając mikroinnowacje, przedsiębiorstwa powinny wybrać odpowiedni typ lub odpowiednie kombinacje różnych typów mikroinnowacji na podstawie kompleksowej analizy wewnętrznych zasobów produktywnych, zasobów zarządczych oraz ograniczeń zewnętrznych.
Micro-innovation, a kind of innovative thinking and innovative manner, can be divided into continuous micro-innovation, imitating micro-innovation and independent micro-innovation based on the dimensions of innovativeness, market disruption and repetitiveness in the innovation domain. On the basis of theoretical and empirical research, this paper analyzes the impact of the main micro-innovation affecting factors on micro-innovation types. Affecting factors including productive resources, management resources and external restrictions have a more prominent impact on imitating micro-innovation, while having a lower correlation with independent micro-innovation and continuous micro-innovation. Enterprises should select an appropriate micro-innovation type or different type combinations according to the comprehensive analysis of enterprise internal productive resources, management resources and external restrictions when implementing micro-innovation.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A single upper limb pose estimation method based on the improved stacked hourglass network
Autorzy:
Peng, Gang
Zheng, Yuezhi
Li, Jianfeng
Yang, Jin
Tematy:
convolutional neural network
stacked hourglass network
skeleton key point
single upper limb pose estimation
human machine coordination
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Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:
https://bibliotekanauki.pl/articles/1838179.pdf  Link otwiera się w nowym oknie
Opis:
At present, most high-accuracy single-person pose estimation methods have high computational complexity and insufficient real-time performance due to the complex structure of the network model. However, a single-person pose estimation method with high real-time performance also needs to improve its accuracy due to the simple structure of the network model. It is currently difficult to achieve both high accuracy and real-time performance in single-person pose estimation. For use in human–machine cooperative operations, this paper proposes a single-person upper limb pose estimation method based on an end-to-end approach for accurate and real-time limb pose estimation. Using the stacked hourglass network model, a single-person upper limb skeleton key point detection model is designed. A deconvolution layer is employed to replace the up-sampling operation of the hourglass module in the original model, solving the problem of rough feature maps. Integral regression is used to calculate the position coordinates of key points of the skeleton, reducing quantization errors and calculations. Experiments show that the developed single-person upper limb skeleton key point detection model achieves high accuracy and that the pose estimation method based on the end-to-end approach provides high accuracy and real-time performance.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of spinal flexion angles during smartphone use in toilet: a randomized cross-over with three-period study
Autorzy:
Luo, Ziyi
Li, Baojian
Liu, Ying
Li, Yang
Liu, Gang
Tematy:
toilet
smartphone
cervical spine
biomechanics
inertial measuring unit
sitting position
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Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/58969749.pdf  Link otwiera się w nowym oknie
Opis:
The purpose of this study was to quantify the impact of smartphone use while sitting on the toilet on the spinal flexion angles and the time effect. Methods: Measurements of the spinal flexion angles in the sagittal plane were made by thirty participants while they sat on the toilet for 10 min, using a smartphone in either one, both, or neither hand. The individual’s forehead, cervical, thoracic and lumbar spinal areas were each fitted with five different inertial motion sensors. SPSS 26.0 software was used to statistically evaluate all of the data. Results: People who used smartphones with both hands had considerably larger (P < 0.05) cervical and spinal flexion angles than those who did not. A statistically significant (P < 0.001) association was observed by regression analysis between time and spinal flexion angle (r = 0.747 for no smartphone, r = 0.793 for a smartphone used in one hand and r = 0.855 for a smartphone used in both hands). Consequently, when using the smartphone with both hands, the flexion angle of the spine entered a more stable state of angles. Conclusions: The results showed that the cervical region’s flexion angles change when using a smartphone while sitting on the toilet. Even when not using a smartphone, the flexion angle of the spine when sitting on the toilet will progressively increase.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of marine risers subjected to shoal/deep water in the installation process
Autorzy:
Wang, Yikun
Luo, Songxiang
Yang, Mo
Qin, Tao
Zhao, Jing
Yu, Gang
Tematy:
sail catamaran
green shipping
zero emission
hybrid propulsion
Pokaż więcej
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:
https://bibliotekanauki.pl/articles/32899597.pdf  Link otwiera się w nowym oknie
Opis:
The dynamics of the installation process of marine risers subjected to shoal/deep seawater is studied. The riser is assumed to be a cantilevered Euler‒Bernoulli beam. The upper end of the riser is clamped on the vessel or the drilling platform. The lower end of the riser is connected to the Blowout Preventer Stack (BOPs) and Lower Marine Risers Package (LMRP). The lateral fluid forces induced by the sea wave and sea current are introduced into the governing equations of motion. The lateral displacement and stress distributions of the riser are obtained by solving the governing equation of the riser via Galerkin’s discretisation scheme and a fourth-order Runge‒Kutta algorithm. The results indicate that the riser exhibits different behaviours under various depths because of the different distributions of the flow velocity ranging from the sea surface to the seabed. In the case of shoal water, the dynamics of the riser are dominated by the sea wave, while in the case of deep water it is affected mainly by the sea current velocity and sea surface wind velocity.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fracture interference and propagation geometry of hydraulic fractures based on XFEM in an unconventional oil reservoir
Autorzy:
Liang, Shuang
Wang, Di
Liu, Dan
Tian, Yang
Wang, Haibo
Li, Fengxia
Dong, Gang
Yin, Chengfeng
Yang, Yi
Tematy:
złoże ropy
odwiert poziomy
gaz łupkowy
hydraulic fracturing
fracture interference
XFEM
fracture propagation geometry
unconventional oil reservoirs
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:
https://bibliotekanauki.pl/articles/59111423.pdf  Link otwiera się w nowym oknie
Opis:
Unconventional oil and gas reservoirs are characterised by low porosity, low permeability and low natural deliverability. At present, horizontal wells staged fracturing is an effective development method. However, in the case of staged hydraulic fracturing in horizontal wells, stress interference occurs between multiple fractures, leading to fracture deformation and even inhibiting the formation of fractures, thereby affecting reservoir production. In this paper, based on the extended finite element method (XFEM), considering the fluid flow in the fracture and fracturing fluid filtration, we analyse the effects of fracturing fluid pumping rate, fracture spacing and elastic modulus on horizontal in-situ stress, fracture parameters and fracture extension pattern during different fracturing initiation processes. The results show that the induced stress generated by the action of fracturing fluid changes the direction of horizontal in-situ stress in the elliptical region around the fracture. In the mode of simultaneous fracture initiation (TFIS), the extension of two symmetrical fractures is “repulsive”; in the mode of two fractures initiated at different times (TFIDT), the extension direction is “mutual attraction”. A large pumping rate and small elastic modulus are conducive to fracture propagation. In the TFIS mode, two fractures alternately expand, while in the TFIDT mode, the impact of rock mechanical properties and construction parameters on fracture propagation will be amplified. The extension of subsequent fractures will be restrained, especially when the fracture spacing is less than 10 m. The width of the previously created fracture will be severely affected, even causing a partial closure and becoming elongated fractures.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhanced antireflective and laser damage resistance of refractive-index gradient SiO2 nanostructured films at 1064 nm
Autorzy:
Wan, Lili
Yang, Jie
Liu, Xiaoru
Zhu, Jiayi
Xu, Gang
Hao, Chenchun
Chen, Xuecheng
Xiong, Zhengwei
Tematy:
SiO nanostructured films
sol-gel procedure
refractive-index gradient
antireflective
laser damage resistance
Pokaż więcej
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:
https://bibliotekanauki.pl/articles/59124220.pdf  Link otwiera się w nowym oknie
Opis:
A facile sol-gel procedure was employed to create refractive-index gradient SiO2 antireflective (AR) films. A monolayer film, characterized by the porous crosslinking framework, was fabricated with a designed volume ratio mixture both with colloidal silica suspension and soluble organic polysiloxane. The upper layer for the bilayer film was a hexamethylisilazane (HMDS) modified colloidal silica suspension, leading to the film surface transfer to hydrophobic. The strategic design of nanostructures in the bottom and upper layers resulted in a refractive-index gradient SiO2 film with enhanced AR properties. The bilayer film demonstrated a transmittance of 99.5% at 1064 nm, accompanied by a notable reduction in refectivity. Moreover, the laser-induced damage threshold of the bilayer film was increased by 30%, rising to as high as 24.7 J/cm2 . The SiO2 nanostructured film both showed a refractive-index gradient structure with excellent AR properties and exhibited good laser damage resistance.
Dostawca treści:
Biblioteka Nauki
Artykuł
Autorzy:
Dong, Guang-Hui
Ding, Yizhen
Chen, Shi
Knibbs, Luke D.
Markevych, Iana
Dadvand, Payam
Yang, Bo-Yi
Heinrich, Joachim
Yi-Dan Zhang
Lu Wang
Gang-Long Zhou
Liu, Kang-Kang
Zhao, Tianyu
Browning, Matthew H.E.M.
Opis:
Background: Potential effect of greenspace exposure on human microbiota have been explored by a number of observational and interventional studies, but the results remained mixed. We comprehensively synthesized these studies by performing a systematic review following Preferred Reporting Items for Systematic Reviews and Meta- Analyses guidelines. Methods: Comprehensive literature searches in three international databases (PubMed, Embase, and Web of Science) and three Chinese databases (China National Knowledge Infrastructure, Wanfang, and China Biology Medicine disc) were conducted from inception to November 1, 2023. Observational and interventional studies that evaluated associations between greenspace exposure and human microbiota at different anatomical sites were included. Studies were assessed using the National Toxicology Program’s office of Health Assessment and Translation risk of bias tool and certainty of evidence was assessed using the Grading of Recommendations, Assessment, Development and Evaluation framework. Two authors independently performed study selection, data extraction, and risk of bias assessment, and evidence grading. Study results were synthesized descriptively. Results: Twenty studies, including 11 observational studies and 9 interventional studies, were finally included into the systematic review. The microbiota of the included studies was from gut (n = 13), skin (n = 10), oral cavity (n = 5), nasal cavity (n = 5) and eyes (n = 1). The majority of studies reported the associations of greenspace exposure with increased diversity (e.g., richness and Shannon index) and/or altered overall composition of human gut (n = 12) and skin microbiota (n = 8), with increases in the relative abundance of probiotics (e.g., Ruminococcaceae) and decreases in the relative abundance of pathogens (e.g., Streptococcus and Escherichia/Shigella). Due to limited number of studies, evidence concerning greenspace and oral, nasal, and ocular microbiota were still inconclusive.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 13

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