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Tytuł:
Effect of spiral vanes width on the separation performance of a hydrocyclone
Autorzy:
Liu, Peikun
Wang, Xiaoguo
Jiang, Lanyue
Zhang, Yuekan
Yang, Xinghua
Li, Xiaoyu
Wang, Hui
Powiązania:
https://bibliotekanauki.pl/articles/27323656.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydrocyclone
vane width
numerical simulation
separation performance
Opis:
Aiming at the problem of “entrainment fine particles in underflow” of hydrocyclone in grinding and classification process, a hydrocyclone with spiral vanes (the SV hydrocyclone) was proposed. The CFD techniques were used to study the pressure field, velocity field, turbulence field, particle field and classification efficiency of hydrocyclones with spiral vanes of different widths. The results show that the pressure drop, axial velocity, tangential velocity, turbulence intensity of SV hydrocyclone are reduced in different degrees compared with conventional hydrocyclone, and the reduction becomes more obvious with the increase of vane width. In the case of a vane width of 0.04D, the underflow recovery rate of 5μm and 10μm fine particles was reduced by 16.2% and 15.7%. The selection of spiral vanes with small widths is beneficial to improve the separation accuracy of fine particles and reduce the cut particle size.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 173563
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on peripheral clamping of large-aperture laser transport mirror
Autorzy:
Cao, Tingfen
Liu, Bowu
Wang, Hui
Ni, Wei
Zhang, Jinli
Chen, Xiaojuan
Li, Yingang
Zhou, Hai
Jiang, Xiaodong
Hu, Dongxia
Zhu, Qihua
Powiązania:
https://bibliotekanauki.pl/articles/27310087.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
transport mirror
peripheral clamping
surface distortion
assembly structure
Opis:
This article introduces the study of peripheral clamping for large-aperture laser mirrors in high power laser facilities. Some multi-point clamping schemes were experimentally tested, the results of the experiments show that these schemes cannot meet the technical requirements, and in the simulation analysis, we explain the reason for this phenomenon. It is concluded that the additional bending moment caused by the non-ideal process factors in the multi-point clamping is the main cause for the surface distortion. Based on the above conclusions, we carried out research on minor-point clamping. Experimental verification of the minor-point clamping were done, the results show that the minor-point clamping can meet the requirements of technical indicators in whole process. This work can provide a reference for the design of the large-aperture transport mirror clamping structure, which may be used in huge laser devices and telescopes.
Źródło:
Optica Applicata; 2023, 53, 2; 227--238
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the cleanliness of super clean coal prepared by water-only cyclone
Autorzy:
Liu, Peikun
Wang, Hui
Jiang, Lanyue
Zhang, Yuekan
Yang, Xinghua
Li, Xiaoyu
Li, Feng
Powiązania:
https://bibliotekanauki.pl/articles/24085799.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
cyclone separating
chemical deashing
super clean coal
surface characteristics
comparative study
Opis:
Maintaining clean and pristine nature is the key to the use of super clean coal (SCC) for coal-based materials or energy combustion. Herein, SCC is prepared by a new water-only cyclone method, and compared the surface characteristics with the SCC products obtained by conventional chemical deashing method. The results indicate that: FTIR analysis revealed that the chemical method changed the original functional group of coal; BET analysis revealed that the SCC products prepared by the water-only method maintained the micropore volume of the raw coal and yielded a uniform and concentrated distribution of pore sizes, however, the chemical method destroying the original pore structure in the coal; SEM-EDS analysis indicated that the surface of SCC particles that were deashed using the water-only cyclone method was smooth and neat, whereas those obtained using the chemical method were seriously corroded, had a rough surface, and the SCC particles were prone to acid residues and precipitates. This study opens an innovative, simple, and clean method for the preparation of SCC, which further expands and enhances the potential application value of SCC.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168129
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composition of norfloxacin-resistant bacteria and isolation of norfloxacin-degrading bacteria in subtropical aquaculture ponds in China
Autorzy:
Mao, Lutian
Chen, Lifen
Wang, Xirui
Xu, Zhongbao
Ouyang, Hui
Huang, Biyou
Zhou, Libin
Powiązania:
https://bibliotekanauki.pl/articles/4790189.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-throughput sequencing
norfloxacin
antibiotic resistant bacterium
pond culture
Opis:
To analyze the composition of norfloxacin-resistant bacteria and norfloxacin-degrading bacteria in pond water and sediment in subtropical China, the composition of antibiotic resistant bacteria in pond water and sediment enriched with norfloxacin-containing medium was analyzed by high-throughput sequencing. Sediment and water samples were collected from 3 fish ponds in subtropical China, and domesticated with norfloxacin, subsequently norfloxacin-resistant bacteria through high-throughput sequencing of 16S rDNA, and isolated norfloxacin--degrading bacteria. Our results showed that the pond sediment and water contain a variety of norfloxacin-resistant bacteria, mainly from Proteobacteria, Bacteroidetes, Actinobacteria, Firmicutes, and Chloroflexi. Moreover, we isolated two norfloxacin-degrading bacteria (NorXu-2 and NorXu-3). The norfloxacin-degrading rate by NorXu-2 and NorXu-3 in the culture mediums with 200 μg/mL was the highest, which was up to 49.71% and 35.79%, respectively. When the norfloxacin concentration was 200 μg/mL, NorXu-2 and NorXu-3 had the best norfloxacin- -degrading effect at pH of 6, and the degradation rates were 53.64% and 45.54%, respectively. Moreover, NorXu-3 exhibited a good tolerance to high NaCl concentration. These results not only provided basic data for the follow-up study of the molecular mechanism of antimicrobial microbial degradation, but also provided potential norfloxacin degrading bacteria for norfloxacin removal and bioremediation in aquaculture environment.
Źródło:
Archives of Environmental Protection; 2022, 48, 4; 95--101
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of organic supplementation to reduced rates of chemical fertilization on soil fertility of Zanthoxylum armatum
Autorzy:
Saba, T.
Liu, W.
Wang, J.
Saleem, F.
Kang, X.
Hui, W.
Gong, W.
Li, H.
Powiązania:
https://bibliotekanauki.pl/articles/2130175.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
fertilization
soil fertility
nutrient availability
organic manure
culturable microbes
Opis:
Soil acidification, fertility depletion, food insecurity, and environmental pollution all are consequences of the extensive use of chemical fertilizers (CF) in intensively managed plantations. Recent studies have shown that incorporating organic manure (OM) to partially replace CF can help to maintain productivity and soil health. There are no reports on integrated fertilizer management of Zanthoxylum armatum, for optimal ecological services and economic profitability. A pot experiment with Z. armatum was performed to investigate the possibility of incorporating OM in reducing CF use, enhancing soil fertility, and increasing plant growth. For this, seven treatments were designed: NPK, PK, NP, NK, OM, MNPK (50%NPK+50%OM), and control (CK, no fertilizer application). The results showed that NPK application significantly (P < 0.05) increased plant growth, soil nitrate-N, ammonium-N and available K compared to CK. However conventional CF application induced soil acidification. OM application raised the soil pH from 5.50 (CK) to 6.58 and significantly enhanced soil fertility by increasing alkali-hydrolysable N (2.3 times), ammonium-N (1.4 times), available P (4.3 times), the activity of invertase (1.5 times), catalase (2.8 times), acid phosphatase (1.5 times), and count of soil culturable microbes (2.9 times) compared to CK. Conversely, sole OM application did not result in optimum plant growth. Integrating OM with NPK (MNPK), on the other hand, not only provided the highest growth comprehensive value (0.84), but also substantially higher soil fertility comprehensive value (0.71) than traditional CF treatments. Correlation analysis also indicated a positive and significant correlation between soil microbes, enzyme activities and available nutrients. Therefore, OM+NPK could be an optimum measure to get maximum benefits regarding soil fertility, growth of Z. armatum, fertilizer savings and sustainable agroecology.
Źródło:
Dendrobiology; 2022, 87; 123-136
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Feature Extraction for Pineapple Ripeness Classification
Autorzy:
Wang, Hui Hui
Chai, Sze Ye
Powiązania:
https://bibliotekanauki.pl/articles/2058509.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
image processing technique
pineapple
ripeness grading
Opis:
A novel feature extraction method has been proposed to improve the accuracy of the pineapple ripeness classification process. The methodology consists of six stages, namely: image acquisition, image pre-processing, color extraction, feature selection, classification and evaluation of results. The red element in the RGB model is selected as the threshold value parameter. The ripeness of pineapples is determined based on the percentage share of yellowish scales visible in images presenting the front and the back side of the fruit. The prototype system is capable of classifying pineap ples into three main groups: unripe, ripe, and fully ripe. The accuracy of 86.05% has been achieved during experiments.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 1; 14--22
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on disturbance rejection control strategy of vehicle drive axle loading test bench
Autorzy:
Yu, Hui
Wang, Hui
Li, Nanqi
Zhao, Guochao
Powiązania:
https://bibliotekanauki.pl/articles/2086968.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
loading test-bed
disturbance
adaptive backstepping sliding mode control
overshoot
sinusoidal tracking error
Opis:
Aiming at the problems of parameter disturbance and coupling disturbance in a vehicle drive axle loading test-bed, this paper used the adaptive backstepping sliding mode control (ABSMC) strategy to design the controller for the speed and torque system. The effectiveness of the controller has been verified by simulation and an experiment. The results show that the equivalent moment of inertia is increased by 5 times, and the step response overshoot of the speed system is 4.1%. By adding a random disturbance, the sinusoidal tracking errors of the speed and torque systems are 0.05 r/min and 0.09Nm, respectively.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 2; 227--238
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on new process for separation of silicon wafers and glass from decommissioned photovoltaic module
Autorzy:
Zhang, Jian wen
Wang, Hai dong
Zhang, Sheng guang
Liang, Han
Guo, Hui
Tao, Si-yao
Powiązania:
https://bibliotekanauki.pl/articles/2175425.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
crystalline silicon photovoltaic modules
decommissioned photovoltaic modules
silicon
solar cell
tempered glass
vibration separation
Opis:
In view of the disadvantages of the existing electrostatic separation process of decommissioned photovoltaic modules, which can only achieve the separation of fine silicon wafers and glass and has high energy consumption, a new process to solve the efficient dry separation of coarse silicon wafers and glass in decommissioned photovoltaic modules is proposed- the vibration separation method. Based on the theoretical analysis of the vibration separation of flaky silicon wafer and polyhedral glass particles, the effects of feed size, feed amount, vibration voltage, vibration frequency, horizontal inclination angle and longitudinal inclination angle on the product indexes of wafer and glass separation were investigated by single factor experiment. The optimal experimental conditions were obtained as follows: feed particle size +0.83mm, feed amount 0.15 t/h, vibration voltage 190 V, vibration frequency 48 Hz, horizontal inclination Angle 8°, longitudinal inclination Angle 3°. Under this optimized condition, the content of metal Si in the obtained silicon wafer product is 84.47%, the recovery rate of is 83.73%, the content of impurity SiO2 is 1.09%, and the content of SiO2 in the obtained glass product is 65.69%, and the recovery rate is 98.95%, the impurity metal Si content is 0.56%. This study provides a research idea for the industrial separation of silicon wafers and glass from decommissioned photovoltaic modules.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 151679
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Bidirectional Buck-Boost Converter-Based Switching Ripple Communication Strategy for Intelligent Street Lighting Systems
Autorzy:
Zhang, Yixuan
Hu, Yihua
Tse, Zion
Liu, Yuwei
Deng, Jiamei
Xu, Hui
Wang, Yangang
Li, Wei
Powiązania:
https://bibliotekanauki.pl/articles/1955998.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bidirectional switching ripple communication
buck-boost converter
intelligent street lighting system
pulse width modulation
smart city
Opis:
The light-emitting diode (LED) is an essential component of intelligent street lighting (ISL) systems. An efficient ISL system can not only reduce power consumption by planning LED illuminating time but also reduce maintenance costs through a high degree of automation. In this paper, a buck-boost converter is used to realise composite transmission of power and signals for an ISL system. The power is modulated by the pulse width modulation (PWM) approach, and the switching ripple generated in the PWM process is utilised as the carrier of the signals transmitted between the remote-control centre and the slave nodes. Moreover, the proposed model involves a ‘request to send (RTS)/confirm to send (CTS)’ mechanism to avoid signal conflicts. Compared with the conventional power line communication (PLC) approach, the proposed transmission scheme has the advantages of simple circuit structure and simple system wiring. Additionally, a simulation model built in MATLAB/Simulink proves the designed transmission method has strong anti-noise ability.
Źródło:
Power Electronics and Drives; 2021, 6, 41; 260-275
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative life cycle assessment of marine desox systems
Autorzy:
Cui, Mengqi
Lu, Yingwei
He, Jiahao
Ji, Lei
Wang, Hui
Liu, Shaojun
Powiązania:
https://bibliotekanauki.pl/articles/1573636.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
life cycle assessment
desulphurization
3E model
Opis:
With new sulphur oxides emission limits carried out in 2020, multiple desulphurisation methods have been proposed. The main desulphurisation scrubber systems were chosen and investigated using life cycle assessment. The whole system life is divided into the construction and operational phases. Three different systems classified by desulphurisers, namely, seawater, NaOH, and Mg-based systems, were modelled in GaBi software. Moreover, environmental, economic and energy aspects (3E model) were introduced for further analysis. Through this study, some conclusions have been drawn. As for the environmental aspect, the seawater system has the most pleasing performance since the primary emissions come from 1.24E+03 kg CO2 and 1.48E+01 kg chloride. The NaOH system causes 1000 times more emissions than the seawater. The Mg-based system has less pollution than the NaOH system, with 5.86E+06kg CO2 and 3.86E+03 kg chloride. The economic aspect is divided into capital expenditure (CapEx) and operational expenditure (OpEx) to estimate disbursement. The seawater system also has the most favourable cost appearance, which takes 1.7 million dollars without extra desulphuriser expenses, based on 10MW engine flue gas treatment. The next is the Mg-based system, which cost 2 million dollars in CapEx and $ 1200/year in OpEx for the desulphuriser. NaOH uses about 2.5 million dollars for construction and $ 30000/year in desulphuriser. As for the energy aspect, the seawater and Mg-based systems use less non-renewable energy than the NaOH system in the construction phase. In conclusion, the seawater system shows the best performance and could be an alternative in SOx control technologies. This study sheds light on the comprehensive evaluation of marine environmental protection technologies for further optimisation.
Źródło:
Polish Maritime Research; 2021, 1; 105-115
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Artistic Characteristics and Fashion Practice of Traditional Ko-ssu in China
Charakterystyka artystyczna i praktyka modowa tradycyjnego Ko-ssu w Chinach
Autorzy:
Wang, Zhicheng
Cui, Rrongrong
Cong, Tianzhu
Liang, Hui’e
Powiązania:
https://bibliotekanauki.pl/articles/1419812.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
K'o-ssu
artistic characteristics
fashion practice
traditional Chinese textile
modern life
charakterystyka artystyczna
praktyka modowa
tradycyjne chińskie tkaniny
współczesne życie
Opis:
K'o-ssu is one of the representative textile techniques of ancient China. It was used in the royal court, known to few people in folk life. However, it was not until the 1950s that the K'o-ssu technique was rediscovered. This paper focus on summarising K'o-ssu artistic characteristics through analysing K'o-ssu's materials, patterns and colours by interviewing experts and physical observation. Taking the NE·TIGER brand as an example, this article will discuss the fashion practice of traditional K'o-ssu art in modern life in order to provide modern designers a reference for promoting this traditional Chinese craft and culture by way of sustainable development.
K'o-ssu to jedna z reprezentatywnych technik tekstylnych starożytnych Chin. Był używany na dworze królewskim, znanym nielicznym w życiu ludowym. Jednak dopiero w latach pięćdziesiątych XX wieku na nowo odkryto technikę K'o-ssu. W pracy skupiono się na podsumowaniu cech artystycznych K'o-ssu poprzez analizę materiałów, wzorów i kolorów K'o-ssu oraz wywiady z ekspertami i obserwacje fizyczne. Biorąc za przykład markę NE·TIGER, w artykule omówiono praktykę modową tradycyjnej sztuki K'o-ssu we współczesnym życiu, tak aby zapewnić współczesnym projektantom odniesienie do promowania tradycyjnego chińskiego rzemiosła i kultury poprzez zrównoważony rozwój.
Źródło:
Fibres & Textiles in Eastern Europe; 2021, 2 (146); 106-111
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Insight into the Catalytic Mechanism of MFe2O4 (M = Ni, Zn and Co) on the Thermal Decomposition of TKX-50
Autorzy:
Hou, Xiaoting
Zhang, Ming
Zhao, Fengqi
Yang, Yanjing
An, Ting
Li, Hui
Pan, Qing
Wang, Xiaohong
Zhang, Kun
Powiązania:
https://bibliotekanauki.pl/articles/27788010.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
bimetallic iron oxide
thermal decomposition
TKX-50
catalysis
mechanism
Opis:
Synthesized dihydroxylammonium 5,5’-bistetrazole-1,1’-diolate (TKX-50) owes its outstanding application prospects in the field of insensitive solid propellants not only to its high energetic performance but also to its low mechanical sensitivity. Based on the excellent catalytic activity of bimetallic iron oxides for the thermal decomposition of TKX-50, the catalytic mechanism of bimetallic iron oxides (NiFe2O4, ZnFe2O4 and CoFe2O4) for TKX-50 pyrolysis has been explored. For this study, the decomposition process of TKX-50, before and after mixing with the bimetallic iron oxides NiFe2O4, ZnFe2O4 and CoFe2O4 was monitored by in-situ FTIR and gas-phase MS-FTIR instruments. Of the different catalysts, ZnFe2O4 gave the best result for reducing the initial decomposition temperature of TKX-50. Additionally, the activation energy of functional group cleavage of TKX-50, before and after mixing with ZnFe2O4, was also calculated for mechanism analysis from the results of the in-situ FTIR measurements. The results showed that the condensate and the gas-phase decomposition products of TKX-50 remained unchanged after mixing with different catalysts, while the activation energy of tetrazole ring cleavage was significantly reduced. The results of this study will be helpful for the rational design of insensitive solid propellant formulations containing TKX-50, and for understanding the pyrolysis mechanisms of TKX-50 before and after mixing with the efficient catalyst ZnFe2O4.
Źródło:
Central European Journal of Energetic Materials; 2021, 18, 2; 223--244
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overseas Dissemination of Ancient Chinese Costume Culture from the Perspective of Cultural Confidence
Rozpowszechnianie poza granicami kraju starożytnej chińskiej kultury kostiumowej z perspektywy zaufania kulturowego
Autorzy:
Wang, Zhicheng
Cui, Rrongrong
Cong, Tianzhu
Liang, Hui'e
Powiązania:
https://bibliotekanauki.pl/articles/1419414.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
cultural confidence
overseas dissemination
ancient China
costume culture
kultura zaufania
rozpowszechnianie za granicą
Chiny
kultura kostiumowa
Opis:
Since the reform and opening-up, China has actively followed overseas costume trends and bidden farewell to the era of uniforms. It has gone through evolution from collective imitation to physical liberation to the advocacy of diversified individuality to this new age, where the Chinese culture of costume is radiant with self-confidence. The culture of ancient Chinese costume has a long history with extensive and profound connotations. This paper, from the perspective of cultural confidence, adopts the propagation mode of '5W' to discuss the overseas dissemination of ancient Chinese costume culture, the specific content of Chinese-foreign exchange, and theoretical approaches in the theoretical framework of communication based on the case of 'American Tour of Innovative Design Works of Ancient Chinese Costume Culture', organised by Jiangnan University in 2018, in a bid to serve as a reference for the narration of the national story, the communication of a national voice and the creation of a national image.
Od czasu reformy i otwarcia Chiny aktywnie podążały za zagranicznymi trendami kostiumowymi i pożegnały się z erą uniformów. Chiny przeszły ewolucję od zbiorowego naśladowania, przez wyzwolenie i popieranie zróżnicowanej indywidualności, aż do tej nowej ery, w której chińska kultura kostiumowa promieniuje pewnością siebie. Kultura starożytnych chińskich strojów ma długą historię z rozległymi i głębokimi konotacjami. W pracy, z punktu widzenia zaufania kulturowego, przyjęto tryb propagacji "5W". W artykule omówiono proces zagranicznego rozpowszechniania starożytnej chińskiej kultury kostiumowej, specyficznej treści chińsko-zagranicznej wymiany oraz teoretycznych podejść w ramach komunikacji w oparciu o wystawę "American Tour of Innovative Design Works of Ancient Chinese Costume Culture", zorganizowaną przez Uniwersytet Jiangnan w 2018 roku. Wydarzenie to posłużyło, jako punkt odniesienia dla narracji narodowej historii, przekazywania głosu narodowego i tworzenia narodowego wizerunku.
Źródło:
Fibres & Textiles in Eastern Europe; 2021, 3 (147); 111-116
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Simulations on Physicochemical Performance of Novel High-energy BHDBT-based Propellants
Autorzy:
Wang, Ke
Huang, Hai-tao
Xu, Hui-xiang
Li, Huan
Li, Jun-qiang
Fan, Xue-zhong
Pang, Wei-qiang
Powiązania:
https://bibliotekanauki.pl/articles/27787879.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
molecular dynamic
BHDBT
migration
mechanical properties
safety
Opis:
Based on Energy Calculation Star program and molecular dynamic method, three designed 2,3-bis(hydroxymethyl)-2,3-dinitro-1,4-butanediol tetranitrate-based (BHDBT) propellants are firstly reported and their physicochemical performance are investigated. Results suggest that compared with HMX-based and CL-20-based propellants, the specific impulses of all BHDBT-based propellants surpass or approximate 280 s, which indicates the latter have the potential to be high-energy propellants. The diffusion coefficient of plasticizers in BHDBT-based propellant decrease as the temperature reduces, and reduce in the order: Bu-NENA > TMETN > BTTN. The densities of all BHDBT-based propellants surpass or approximate 1.7 g/cm3. The comparison of elastic constants, Poisson’s ratios and K/G values indicates that the mechanical properties of three BHDBT-based propellants increase in the order (by plasticizer): Bu-NENA < TMETN < BTTN. The bond length analysis of C–NO2 and O–NO2 bond in BHDBT suggests that the former is the trigger bond in the BHDBT-based propellants, and the safety of BHDBT-based propellants and BHDBT crystal decreases in the order: GAP/BTTN/Al/BHDBT > GAP/Bu-NENA/Al/BHDBT ≈ GAP/TMETN/Al/BHDBT > BHDBT. In conclusion, GAP/BTTN/Al/BHDBT propellant has the potential to be a novel high-energy propellant.
Źródło:
Central European Journal of Energetic Materials; 2021, 18, 1; 5--24
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic characteristics study on the two-stage safety valve used on hydraulic support under impact loading
Autorzy:
Zhao, Guochao
Wang, Hui
Song, Yuning
Zhang, Changshuai
Powiązania:
https://bibliotekanauki.pl/articles/2055035.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
safety valve
impact loading
hydraulic support
dynamic characteristic
Opis:
A two-stage linkage safety valve for hydraulic support is presented. Considering the hydraulic support is impacted, dynamic simulation of the column circuit with the two-stage safety valve subject impact loading was carried out, and the dynamic characteristics of the two- -stage safety valve with different impact forms were studied. A rapid impact loading test rig was built to test the two-stage safety valve sample under impact loading. Simulation and experimental results indicate that the two-stage safety valve has high sensitivity and good unloading performance, it can realize fast and large flow unloading of the hydraulic support under different impact forms and pressures.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 3; 623--635
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł

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