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Wyświetlanie 1-22 z 22
Tytuł:
The new mineral exploration strategies of selected major mineral-rich countries
Nowe strategie poszukiwań złóż surowców mineralnych w wybranych krajach posiadających takie surowce
Autorzy:
Yun, Yu
Powiązania:
https://bibliotekanauki.pl/articles/1849614.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
mineral resource strategy
mineral resources
deposits of minerals
strategia zasobów mineralnych
surowce mineralne
złoża surowców mineralnych
Opis:
This paper first describes basic information on 13 mineral resource strategy reports issued by the world’s major mineral resource exploration countries and regions, including Australia, Canada, Europe, the U.S., Russia, and India. Through these strategic reports, we identified the problems facing current mineral exploration and development, such as mining issues, increased on land access and permitting, disincentives to obtain precompetitive geoscience information, and the urgent need to improve exploration technology to adapt to new demands. Then, by studying the visions and aims of the new mineral resource strategies, this paper found that the strategic goals have something in common: to display a new image of mining development. The new image of mining development is an image of advanced mining through green development, ecological protection, technology intensity, sustainability, and social acceptance, consolidating the primary position and foundational role of mineral resources and mining development in economic and social development. The new image creates a favorable development environment for the rational use and adequate protection of mineral resources. After that, a summary of the measures taken to achieve these objectives, which include strengthening domestic mineral exploration, increasing coordination between mineral exploration and ecological environmental protection, strengthening the life cycle management of the industrial chain, playing a significant role in scientific and technological innovation, and paying close attention to significant shifts in the focus on critical minerals, is provided.
W artykule opisano podstawowe informacje zawarte w 13 raportach, dotyczące strategii zasobów surowców mineralnych, wydanych przez wybrane najważniejsze kraje i regiony zajmujące się poszukiwaniem złóż surowców mineralnych, w tym Australię, Kanadę, Europę, Stany Zjednoczone, Rosję i Indie. Dzięki tym raportom strategicznym zidentyfikowano problemy jakie towarzyszą obecnie poszukiwaniom i zagospodarowaniu złóż, a mianowicie: trudności z wydobyciem, zwiększone zapotrzebowanie na grunty, trudności z uzyskaniem pozwoleń i informacji geologicznej. W związku z tym konieczna jest potrzeba ulepszenia technologii poszukiwań, aby dostosować się do nowych wymagań. Następnie, badając wizje i zadania nowych strategii dotyczących surowców mineralnych, w artykule stwierdzono, że mają one wspólny cel: ukazać nowy wizerunek rozwoju górnictwa. Nowy obraz górnictwa to: zaawansowany rozwój zielonego górnictwa, ochrona ekologiczna, efektywność technologii, zrównoważony rozwój i akceptacja społeczna, utrwalenie podstawowej pozycji i fundamentalnej roli surowców mineralnych w rozwoju gospodarczym i społecznym kraju. Nowy wizerunek stwarza korzystne warunki rozwojowe dla racjonalnego wykorzystania i odpowiedniej ochrony zasobów surowców mineralnych. Dokonano podsumowania działań podjętych w celu osiągnięcia tych zamierzeń, które obejmują zwiększenie: poszukiwań surowców mineralnych, koordynacji między poszukiwaniem złóż i ekologiczną ochroną środowiska, wzmocnienia zarządzania cyklem życia łańcucha przemysłowego, znaczącej roli w innowacjach naukowych i technologicznych, jak również zwracanie bacznej uwagi na zmiany zainteresowania krytycznymi surowcami mineralnymi.
Źródło:
Gospodarka Surowcami Mineralnymi; 2021, 37, 1; 5-20
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The new mineral exploration strategies of selected major mineral-rich countries
Nowe strategie poszukiwań złóż surowców mineralnych w wybranych krajach posiadających takie surowce
Autorzy:
Yun, Yu
Powiązania:
https://bibliotekanauki.pl/articles/1849621.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
mineral resource strategy
mineral resources
deposits of minerals
strategia zasobów mineralnych
surowce mineralne
złoża surowców mineralnych
Opis:
This paper first describes basic information on 13 mineral resource strategy reports issued by the world’s major mineral resource exploration countries and regions, including Australia, Canada, Europe, the U.S., Russia, and India. Through these strategic reports, we identified the problems facing current mineral exploration and development, such as mining issues, increased on land access and permitting, disincentives to obtain precompetitive geoscience information, and the urgent need to improve exploration technology to adapt to new demands. Then, by studying the visions and aims of the new mineral resource strategies, this paper found that the strategic goals have something in common: to display a new image of mining development. The new image of mining development is an image of advanced mining through green development, ecological protection, technology intensity, sustainability, and social acceptance, consolidating the primary position and foundational role of mineral resources and mining development in economic and social development. The new image creates a favorable development environment for the rational use and adequate protection of mineral resources. After that, a summary of the measures taken to achieve these objectives, which include strengthening domestic mineral exploration, increasing coordination between mineral exploration and ecological environmental protection, strengthening the life cycle management of the industrial chain, playing a significant role in scientific and technological innovation, and paying close attention to significant shifts in the focus on critical minerals, is provided.
W artykule opisano podstawowe informacje zawarte w 13 raportach, dotyczące strategii zasobów surowców mineralnych, wydanych przez wybrane najważniejsze kraje i regiony zajmujące się poszukiwaniem złóż surowców mineralnych, w tym Australię, Kanadę, Europę, Stany Zjednoczone, Rosję i Indie. Dzięki tym raportom strategicznym zidentyfikowano problemy jakie towarzyszą obecnie poszukiwaniom i zagospodarowaniu złóż, a mianowicie: trudności z wydobyciem, zwiększone zapotrzebowanie na grunty, trudności z uzyskaniem pozwoleń i informacji geologicznej. W związku z tym konieczna jest potrzeba ulepszenia technologii poszukiwań, aby dostosować się do nowych wymagań. Następnie, badając wizje i zadania nowych strategii dotyczących surowców mineralnych, w artykule stwierdzono, że mają one wspólny cel: ukazać nowy wizerunek rozwoju górnictwa. Nowy obraz górnictwa to: zaawansowany rozwój zielonego górnictwa, ochrona ekologiczna, efektywność technologii, zrównoważony rozwój i akceptacja społeczna, utrwalenie podstawowej pozycji i fundamentalnej roli surowców mineralnych w rozwoju gospodarczym i społecznym kraju. Nowy wizerunek stwarza korzystne warunki rozwojowe dla racjonalnego wykorzystania i odpowiedniej ochrony zasobów surowców mineralnych. Dokonano podsumowania działań podjętych w celu osiągnięcia tych zamierzeń, które obejmują zwiększenie: poszukiwań surowców mineralnych, koordynacji między poszukiwaniem złóż i ekologiczną ochroną środowiska, wzmocnienia zarządzania cyklem życia łańcucha przemysłowego, znaczącej roli w innowacjach naukowych i technologicznych, jak również zwracanie bacznej uwagi na zmiany zainteresowania krytycznymi surowcami mineralnymi.
Źródło:
Gospodarka Surowcami Mineralnymi; 2021, 37, 1; 5-20
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Side lobes reducing by variation of array apperture edge shape
Autorzy:
Gorobets, N.N.
Gorobets, Yu.N.
Kiyko, V.I.
Powiązania:
https://bibliotekanauki.pl/articles/308797.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
phone antenna arrays
side lobes level reducing
Opis:
A possibility of side lobes level reducing in plane antenna array by creation of aperture comb edge in arrays with rectangular and circular aperture shape together with usage of different types of reducing to the array edges amplitude distributions is investigated by computer analysis. It is shown that usage of the comb structure in combination with the reducing amplitude distribution enables one to reach the side lobes level reducing in the array to -27 ÷ -29 dB.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 1-2; 85-89
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessing the criticality of minerals used in emerging technologies in China
Ocena krytycznych surowców mineralnych wykorzystywanych w nowo powstających technologiach w Chinach
Autorzy:
Yu, Yun
Powiązania:
https://bibliotekanauki.pl/articles/216192.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
critical minerals
China
strategic emerging industries
surowce krytyczne
surowce mineralne
Chiny
branża wschodząca strategiczna
Opis:
Emerging technologies represent the direction of the new industrial revolution of promoting sustainable economic and social development, and strategic emerging industries have developed rapidly in China. The development of these emerging technology industries requires more mineral resources as raw materials, especially the need for specific minerals, has increased. The unsatisfied growing demand for minerals used in emerging technologies or an unexpected supply disruption in major producing countries could have an impact on economic development. There are only several studies on the supply of mineral resources from the perspective of mineral resources needed by the development of China’s emerging industries. To assess the criticality of the minerals needed by the strategic emerging industries in China, this paper adopts three indicators: import concentration, the volatility of prices and the application requirements by the Chinese 13th five-year plan dedicated to strategic emerging industries in 2016. Furthermore, 34 types of nonfuel minerals and mineral raw materials are separated into three categories. Finally, this paper indicates that the three indexes are all high for 8 minerals with supply risks, application in emerging technologies, and substantial market fluctuations which need the support of special policies. Two indexes of three Level-II indicators are high for 14 minerals which need different policy combination measures, and one index is high for 12 minerals which also needs attention, all of which were analyzed.
Nowo powstające technologie stanowią kierunek nowej rewolucji przemysłowej promującej zrównoważony rozwój gospodarczy i społeczny, a strategiczne wschodzące branże przemysłu szybko rozwinęły się w Chinach. Rozwój tych nowo powstających branż technologicznych wymaga wykorzystania znacznej ilości zasobów surowców mineralnych, a zwłaszcza ściśle określonych surowców mineralnych. Niezaspokojony rosnący popyt na surowce mineralne (pierwiastki, minerały, surowce mineralne metaliczne) wykorzystywane w nowo powstających technologiach lub nieoczekiwane zakłócenie dostaw z produkujących je krajów może mieć wpływ na rozwój gospodarczy. Występują nieliczne badania dotyczące podaży zasobów surowców mineralnych z punktu widzenia zasobów surowców mineralnych potrzebnych do rozwoju wschodzących branż przemysłu w Chinach. Aby ocenić krytyczność surowców mineralnych potrzebnych strategicznym wschodzącym branżom przemysłu w Chinach, w artykule przyjęto trzy wskaźniki: koncentrację importu, zmienność cen i wymogi dotyczące zastosowania zawarte w trzynastym chińskim planie pięcioletnim poświęconym strategicznym wschodzącym przemysłom w 2016 roku. Ponadto 34 rodzaje surowców mineralnych (pierwiastki, metale, surowce mineralne niepaliwowe) podzielono na trzy kategorie. Ostatecznie, w artykule pokazano, że wszystkie trzy indeksy są wysokie dla 8 surowców mineralnych z ryzykiem ich dostaw, zastosowaniem w nowych technologiach i znacznymi wahaniami rynku, które wymagają specjalnej polityki wsparcia. Dwa wskaźniki z trzech wskaźników poziomu II są wysokie dla 14 surowców mineralnych, które wymagają kombinacji różnej polityki wsparcia, a jeden wskaźnik jest wysoki dla 12 surowców mineralnych, które również wymagają uwagi spośród wszystkich, które zostały przeanalizowane.
Źródło:
Gospodarka Surowcami Mineralnymi; 2020, 36, 2; 5-20
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis And Characterization Of SiO2, SnO2 And TiO2 Metal Oxide Shells Covering Cu2O Particles
Synteza i charakterystyka powłok tlenkowych SiO2, SnO2 i TiO2 pokrywających cząstki Cu2O
Autorzy:
Yu, R.
Yun, J.
Kim, Y.
Powiązania:
https://bibliotekanauki.pl/articles/355566.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cu2O
metal oxide coating
pH value
SiO2
TiO2
SnO2
powłoki tlenkowe
Opis:
In this work is described a means of improving the chemical stability of Cu2O@SiO2, Cu2O@SnO2 and Cu2O@TiO2 materials. The SiO2, SnO2 and TiO2 coated samples were stable from pH 3 to pH 10 for up to seven days. To determine the stability of the coated nanoparticles, and their colloidal solutions under acidic and basic conditions, colloidal nanoparticle solutions with various pH values were prepared and monitored over time. Details of the effect of variations in pH on the phase stability of core-shell type Cu2O were characterized using transmission electron microscopy and X-ray diffraction.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1159-1163
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Black CoFe2O4 Pigments Using MOOH (M = Fe and Co) Nanorod
Autorzy:
Yu, R.
Yun, J.
Kim, Y.
Powiązania:
https://bibliotekanauki.pl/articles/355743.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
β-Co/FeOOH
CoFe2O4
black pigment
substitution
solid solution
Opis:
We studied the coloration and phase transformation of various iron based pigment with cobalt substitution method and heat treatment. First, we synthesized well defined one dimension β-Fe/CoOOH nanorods using the solid solution method. Yellowish β-Fe/CoOOH nanorods were transformed into reddish intermediate states and, finally, black CoFe2 O4 pigments was obtained. Divalent cobalt ions easily occupied tetrahedral sites. The prepared pigments were well characterized in terms of physical properties by using UV-vis, CIE Lab color parameter measurements, SEM (scanning electron microscopy) and XRD (powder X-ray diffraction). In addition, the magnetization property of the prepared CoFe2 O4 pigment was confirmed by VSM (vibrating sample magnetometer).
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1231-1234
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time invariant property of weighted circular convolution and its application to continuous wavelet transform
Autorzy:
Yi, Hua
Ru, Yu-Le
Dai, Yin-Yun
Powiązania:
https://bibliotekanauki.pl/articles/2086853.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous wavelet transform
linear convolution
weighted circular convolution
generalized discrete Fourier transform
ciągła transformata falkowa
splot liniowy
splot kołowy ważony
transformata Fouriera uogólniona dyskretna
Opis:
Time invariant linear operators are the building blocks of signal processing. Weighted circular convolution and signal processing framework in a generalized Fourier domain are introduced by Jorge Martinez. In this paper, we prove that under this new signal processing framework, weighted circular convolution also has a generalized time invariant property. We also give an application of this property to algorithm of continuous wavelet transform (CWT). Specifically, we have previously studied the algorithm of CWT based on generalized Fourier transform with parameter 1. In this paper, we prove that the parameter can take any complex number. Numerical experiments are presented to further demonstrate our analyses.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137726, 1--9
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design Of A Bi-Functional α-Fe2O3/Zn2SiO4:Mn2+ By Layer-By-Layer Assembly Method
Projektowanie dwufunkcyjnych proszków α-Fe2O3/Zn2SiO4:Mn2+ metodą warstwa po warstwie
Autorzy:
Yu, R.
Yun, J.
Pee, J-H.
Kim, Y.
Powiązania:
https://bibliotekanauki.pl/articles/352623.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
red pigment
α-Fe2O3
Zn2SiO4:Mn2+ layer
phosphor
bi-functional
czerwony pigment
Zn2SiO4: Mn2+
fosfor
proszki dwufunkcyjne
Opis:
This work describes the design of bi-functional α-Fe2O3/Zn2SiO4:Mn2+ using a two-step coating process. We propose a combination of pigments (α-Fe2O3) and phosphor (Zn2SiO4:Mn2+ ) glaze which is assembled using a layer-by-layer method. A silica-coated α-Fe2O3 pigment was obtained by a sol-gel method and a Zn2+ precursor was then added to the silica-coated α-Fe2O3 to create a ZnO layer. Finally, the Zn2SiO4:Mn2+ layer was prepared with the addition of Mn2+ ions to serve as a phosphor precursor in the multi-coated α-Fe2O3, followed by annealing at a temperature above 1000°C. Details of the phase structure, color and optical properties of the multi-functional α-Fe2O3/Zn2SiO4:Mn2+ were characterized by transmission electron microscopy and X-ray diffraction analyses.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1165-1167
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cloning, expression and genetic transformation of sucrose phosphate synthase (SPS) gene in Saccharum spontaneum L.
Autorzy:
Zhang, Yun-Wei
Zhou, Yun-Zhuan
Lu, Hai-Bo
Zheng, Deng-Yu
Huang, Yan-Hua
Powiązania:
https://bibliotekanauki.pl/articles/952058.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
saccharum spontaneum l.
sps gene
cloning
expression
tissue culture
genetic transformation
Opis:
Sucrose phosphate synthase (SPS) is a key enzyme catalyzing sucrose metabolism in plants. In this study, we isolated the SPS cDNA from Saccharum spontaneum and designated as SsSPS (GenBank accession no. MF398541). The full-length of SsSPS cDNA was 4153-bp with an opening reading frame (ORF) of 3132 nucleotides, which encoded a 1043-amino acid protein. The nucleotide sequences alignment showed that it had 98%, 97% and 87% homology with S. officinarum, Setaria italica and Lolium perenne, respectively. Moreover, the SsSPS was detected to express in leaf and stem tissues of S. spontaneum and exhibited a predominant expression in the stem tissue. However, there was no significant difference in the expression level of SsSPS between young leaves and mature ones. Additionally, we generated transgenic S. spontaneum using Agrobacterium-mediated transformation. Our data will provide a valuable foundation for further study of the potential role of SPS in plants.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2017, 59, 2
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Counterion effects on the alkali dissolution mechanism of quartz
Autorzy:
Yao, Yu-yun
Tang, Yun
Yang, Yong
Li, Guo-hui
Wu, Bo
Dai, Wen-zhi
Powiązania:
https://bibliotekanauki.pl/articles/2200337.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
quartz
counterion
quantum chemistry
hydrolysis
mechanism
Opis:
In gold ore, quartz plays an important role in mineral formation by acting as the follower. Understanding counterion release, transport, and deposition in alkali solution is a prerequisite for evaluating the potential role of gold separate from quartz deposits in pretreatment. In this work, the aggregation, retention, and release of counterion in alkali solution media were investigated by kinetic research and pure mineral experiments, the correlation and mechanism of these processes were revealed by combining geochemical theory, interaction energy calculation, and quantum chemistry. The results showed that the retention and release of counterion were closely related to the dissolution and corrosion rate of quartz. The NH4+ and Fe2+ with higher mineral affinity reduced the quartz stability, and the dispersion stability and mobility of the quartz were greatly improved by an alkaline substance due to the enhancement of steric hindrance effects. Quantum chemical calculation results show that ammonium ion promotes the dissolution of quartz stronger than ferrous ion, which is mainly reflected in reducing the activation energy required for the formation of transition state (TS1), which can be verified by kinetic calculation. These findings provide essential insight into the extraction of gold coated by quartz as well as a vital reference for the experiment of gold-loaded quartz leaching in mineral processing.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 1; art. no. 160038
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strain measurement based on fixed wavelength transmission of tapered long-period fiber grating
Autorzy:
Tang, Yong
Zhang, Hao
Zhang, Li
Yu, Xin Feng
Bai, Yun Feng
Powiązania:
https://bibliotekanauki.pl/articles/2172862.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
tapered fiber
long-period fiber
fiber grating
strain sensor
fixed dual-wavelength ratio
Opis:
This paper studies the relationship between transmission intensity and strain based on tapered long-period fiber grating at a fixed wavelength. In experiments, tapered long-period fiber grating was prepared by the electric melting method. Experimental results show that two resonance peaks appeared at 1482 and 1537 nm, respectively. Here is the elaboration of the relationship between the resonant wavelength and the strain, its wavelength-strain sensitivity is 20 pm/με, and the linearity was negative. Then our next study was about the relationship between transmission intensity and strain at a fixed wavelength. The results show that the transmission intensity at a fixed wavelength is related to the exponent with strain. The coupled-mode theory is applied to simulate the relationship between fixed wavelength and strain. The simulation results matched the experimental results. Two fixed wavelength transmission intensity ratio was used, and the ratio showed a linear relationship with the strain, and the slope is –0.018 dB/με. Therefore, within the 0.01% resolution of our detector, we could resolve a 0.16 με strain change. We can select the appropriate light source and detector to achieve higher measurement accuracy. Thus, there is a great potential in fiber grating strain sensors.
Źródło:
Optica Applicata; 2022, 52, 4; 511--519
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication of Metal Gas Filter by Material Extrusion Additive Manufacturing Process
Autorzy:
Yi, Yu-Jeong
Lee, Min-Jeong
Yun, Su-Jin
Park, Manho
Kim, Ju-Yong
Lee, Jungwoo
Yun, Jung-Yeul
Powiązania:
https://bibliotekanauki.pl/articles/2174560.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gas filter
additive manufacturing
stainless steel
porosity
powder size
Opis:
Recently, 3D printing processes have been used to manufacture metal powder filters with manufacturing complex-shape. In this study, metal powder filters of various shapes were manufactured using the metal extrusion additive manufacturing (MEAM) process, which is used to manufacture three-dimensional structures by extruding a filament consisting of a metal powder and a binder. Firstly, filaments were prepared by appropriately mixing SUS316 powder with sizes ranging from 7.5 µm to 50 µm and a binder. These filaments were extruded at temperatures of 100℃ to 160℃ depending on the type of filament being manufactured, to form three types of cylindrical filter. Specimens were sintered in a high vacuum atmosphere furnace at 850℃ to 1050℃ for 1 hour after debinding. The specimens were analyzed for permeability using a capillary flow porometer, porosity was determined by applying Archimedes’ law and microstructure was observed using SEM.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1517--1520
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic performance and stability analysis of an active inerter-based suspension with time-delayed acceleration feedback control
Autorzy:
Wang, Yong
Jin, Xian-Yu
Zhang, Yun-Shun
Ding, Hu
Chen, Li-Qun
Powiązania:
https://bibliotekanauki.pl/articles/2173651.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
active inerter-based suspension
acceleration feedback control
dynamic performance
stability analysis
time delay
kontrola sprzężenia zwrotnego przyspieszenia
wydajność dynamiczna
aktywne zawieszenie na bazie inertera
analiza stabilności
opóźnienie
Opis:
An active inerter-based suspension with acceleration feedback control is proposed in this paper, the time delay generated in the controllers and actuators is considered, which constitutes the time-delayed active inerter-based (TDA-IB) suspension. The dynamic equation of the TDA-IB suspension is established and is a neutral type of delay differential equation (NDDE) in which the time delay exists in the highestorder derivative. The stability analysis is conducted by calculating the number of unstable characteristic roots based on the definite integral stability method, the stable and unstable regions are determined. The effect of time delay and feedback gain on the dynamic performance of the TDA-IB suspension under harmonic, random, and shock excitations is studied in detail and compared with the parallel-connected inerterbased (PC-IB) and traditional suspensions. The results show that the TDA-IB suspension is asymptotically stable for smaller feedback gain and time delay, through increasing the feedback gain, the stable regions shrink, and a smaller time delay could cause the system to become unstable. Furthermore, the time delay could regulate the resonance peak around the unsprung mass natural frequency and generate multiple high-frequency resonance peaks. If the time delay is chosen appropriately and falls into the stable range, the TDA-IB suspension could improve the dynamic performance for the suspension stroke and dynamic tire load while having a deterioration for the vehicle body acceleration compared with the PC-IB and traditional suspensions.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 2; art. no. e140687
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vehicle emission computation through microscopic traffic simulation calibrated using genetic algorithm
Autorzy:
Wei, Yun
Yu, Ying
Xu, Lifeng
Huang, Wei
Guo, Jianhua
Wan, Ying
Cao, Jinde
Powiązania:
https://bibliotekanauki.pl/articles/91529.pdf
Data publikacji:
2019
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
environment protection
microscopic traffic simulation
genetic algorithm
IVE model
emission evaluation
Opis:
Vehicle emission calculation is critical for evaluating motor vehicle related environmental protection policies. Currently, many studies calculate vehicle emissions from integrating the microscopic traffic simulation model and the vehicle emission model. However, conventionally vehicle emission models are presented as a stand-alone software, requiring a laborious processing of the simulated second-by-second vehicle activity data. This is inefficient, in particular, when multiple runs of vehicle emission calculations are needed. Therefore, an integrated vehicle emission computation system is proposed around a microscopic traffic simulation model. In doing so, the relational database technique is used to store the simulated traffic activity data, and these data are used in emission computation through a built-in emission computation module developed based on the IVE model. In order to ensure the validity of the simulated vehicle activity data, the simulation model is calibrated using the genetic algorithm. The proposed system was implemented for a central urban region of Nanjing city. Hourly vehicle emissions of three types of vehicles were computed using the proposed system for the afternoon peak period, and the results were compared with those computed directly from the IVE software with a trivial difference in the results from the proposed system and the IVE software, indicating the validity of the proposed system. In addition, it was found for the study region that passenger cars are critical for controlling CO, buses are critical for controlling CO and VOC, and trucks are critical for controlling NOx and CO2. Future work is to test the proposed system in more traffic management and control strategies, and more vehicle emission models are to be incorporated in the system.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2019, 9, 1; 67-80
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault mode analysis and reliability optimization design of a mechanical interface based on cylindrical cam mechanisms
Autorzy:
Li, Jian-Hao
Liu, Zhi-Jie
Wang, Da-Peng
Tian, Yun
Zhao, Yu-Chong
Powiązania:
https://bibliotekanauki.pl/articles/1841922.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
mechanical interface
fault mode analysis
Monte Carlo simulation
reliability design
cylindrical cam mechanism
Opis:
The mechanical interface has the characteristics of low shock and vibration, and is emphasized in the aerospace and ocean engineering fields. In this paper, a mechanical interface based on coupled cylindrical cam mechanisms is designed. It can achieve the expected functions, but there exist faults in some times. The fault modes and causes of the interface are firstly analyzed. Then a design approach based on Monte Carlo simulation is presented for analyzing and optimizing its reliability. According to the fault modes, the performance functions of the interface are established for obtaining the optimal scheme. A case is given to illustrate the proposed method. The simulation results and the prototype experiments prove that the optimization scheme effectively improves the reliability of the interface, and has better performance than the original one.
Źródło:
Eksploatacja i Niezawodność; 2020, 22, 4; 715-723
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Pore Characteristics of a SUS316L Gas Filter Fabricated by Wet Powder Spraying
Autorzy:
Lee, Min-Jeong
Yi, Yu-Jeong
Kim, Hyeon-Ju
Park, Manho
Lee, Jungwoo
Yun, Jung-Yeul
Powiązania:
https://bibliotekanauki.pl/articles/2174584.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wet powder spraying process
double pore structures
pore properties
rotation speed
coating time
Opis:
In this study, a flake-shaped metal powder was coated on a tube shaped pre-sintered 316L stainless steel support using a wet powder spraying process to fabricate a double pore structure, and the pore characteristics were analyzed according to coating time and tube rotation speed. The thickness of the coated layer was checked via optical microscopy, and porosity was measured using image analysis software. Air permeability was measured using a capillary flow porometer. As a result of the experiment, the optimal rotation speed of the support tube was established as 200 rpm. When the rotation speed was fixed, the coating thickness and the coating amount of the double pore structure increased as the coating time increased. The porosity of the double pore structure was increased due to the irregular arrangement of the flake-shaped powder. The air permeability of the double pore structure decreased with increasing fine pore layer thickness.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1547--1550
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dual Speed Laser Remelting for High Densification in H13 Tool Steel Metal 3D Printing
Autorzy:
Jung, Im Doo
Choe, Jungho
Yun, Jaecheol
Yang, Sangsun
Yang, Dong-Yeol
Kim, Yong-Jin
Yu, Ji-Hun
Powiązania:
https://bibliotekanauki.pl/articles/353737.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal 3d printing
powder bed fusion
selective laser melting
H13 tool steel
remelting
Opis:
The densification behavior of H13 tool steel powder by dual speed laser scanning strategy have been characterized for selective laser melting process, one of powder bed fusion based metal 3d printing. Under limited given laser power, the laser re-melting increases the relative density and hardness of H13 tool steel with closing pores. The single melt-pool analysis shows that the pores are located on top area of melt pool when the scanning speed is over 400 mm/s while the low scanning speed of 200 mm/s generates pores beneath the melt pool in the form of keyhole mode with the high energy input from the laser. With the second laser scanning, the pores on top area of melt pools are efficiently closed with proper dual combination of scan speed. However pores located beneath the melt pools could not be removed by second laser scanning. When each layer of 3d printing are re-melted, the relative density and hardness are improved for most dual combination of scanning. Among the scan speed combination, the 600 mm/s by 400 mm/s leads to the highest relative density, 99.94% with hardness of 53.5 HRC. This densification characterization with H13 tool steel laser re-melting can be efficiently applied for tool steel component manufacturing via metal 3d printing.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 571-578
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on Pore Properties of Hastelloy Powder Porous Metal Fabricated by Electrostatic Powder Coating
Autorzy:
Lee, Min-Jeong
Yi, Yu-Jeong
Kim, Hyeon-Ju
Park, Man-Ho
Kim, Byoung-Kee
Yun, Jung-Yeul
Powiązania:
https://bibliotekanauki.pl/articles/353929.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrostatic powder coating
Hastelloy
porous metal
pore properties
powder coating amount
Opis:
Porous metals show not only extremely low density, but also excellent physical, mechanical and acoustic properties. In this study, Hastelloy powders prepared by gas atomization are used to manufacture 3D geometries of Hastelloy porous metal with above 90% porosity using electrostatic powder coating process. In order to control pore size and porosity, foam is sintered at 1200~1300°C and different powder coating amount. The pore properties are evaluated using SEM and Archimedes method. As powder coating amount and sintering temperature increased, porosity is decreased from 96.4 to 94.4%. And foam density is increased from 0.323 to 0.497 g/cm3 and pore size is decreased from 98 to 560 μm. When the sintering temperature is increased, foam thickness and strut thickness are decreased from 9.85 to 8.13 mm and from 366 to 292 μm.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 547-550
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Powder Shape and Sintering Temperature on the Preparation of Ni-Based Porous Metal
Autorzy:
Yi, Yu-Jeong
Lee, Min-Jeong
Kim, Hyeon-Ju
Yang, Sangsun
Park, Man-Ho
Kim, Byoung-Kee
Yun, Jung-Yeul
Powiązania:
https://bibliotekanauki.pl/articles/351782.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Hastelloy
porosity
porous metal
powder shape
sintering temperature
Opis:
Usually porous metals are known as relatively excellent characteristic such as large surface area, light, lower heat capacity, high toughness and permeability for exhaust gas filter, hydrogen reformer catalyst support. The Ni alloys have high corrosion resistance, heat resistance and chemical stability for high temperature applications. In this study, the Ni-based porous metals have been developed with Hastelloy powder by gas atomization and water atomization in order to find the effects of powder shape on porous metal. Each Hastelloy powder is pressed on disk shape of 2 mm thickness with 12 tons using uniaxial press machine. The specimens are sintered at various temperatures in high vacuum condition. The pore properties were evaluated using Porometer and microstructures were observed with SEM.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 917-920
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
cDNA cloning, gene organization and expression analysis of human peptidylarginine deiminase type VI.
Autorzy:
Zhang, Jiayi
Dai, Jianliang
Zhao, Enpeng
Lin, Yun
Zeng, Li
Chen, Jinzhong
Zheng, Huari
Wang, Yu
Li, Xin
Ying, Kang
Xie, Yi
Mao, YuMin
Powiązania:
https://bibliotekanauki.pl/articles/1041522.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
ovary
ePAD
peptidylarginine deiminase
hPADVI
Opis:
Peptidylarginine deiminase (PAD) catalyzes the post-translational modification of protein through the conversion of arginine to citrulline in the presence of calcium ions. Human, similar to rodents, has four isoforms of PAD (type I, II, III and IV/V), each of which is distinct in substrate specificity and tissue specific expression. In our large-scale sequencing project, we identified a new human PAD cDNA from a human fetal brain cDNA library. The putative protein encoded by this cDNA is designated hPADVI. Expression analysis of hPADVI showed that it is mainly expressed in adult human ovary and peripheral blood leukocytes. We conclude that hPADVI may be orthologous to mouse ePAD, basing on sequence comparison, chromosome localization and exon-intron structure analysis. PAD-mediated deimination of epithelial cell keratin resulting in cytoskeletal remodeling suggests a possible role for hPADVI in cytoskeletal reorganization in the egg and in early embryo development. This study describes a new important member of the human PAD family.
Źródło:
Acta Biochimica Polonica; 2004, 51, 4; 1051-1058
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of differential serum expression of three factors and pulmonary function in patients with silicosis
Autorzy:
Zhu, Ying
Duan, Xia Yu
Cheng, Yun Qi
Yao, Xin Jing
Xu, Hong
Zhang, Kui Sheng
Li, Feng Shi
Yang, Fang
Liu, Liang He
Yuan, Xiang Ju
Powiązania:
https://bibliotekanauki.pl/articles/2086531.pdf
Data publikacji:
2021-08-05
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
silicosis
pulmonary function
early diagnosis
ROC
PTPN2
factor B
Opis:
ObjectivesSilicosis is a chronic occupational lung disease. As was previously found by the authors, some proteins increased in the lung tissue of activated rats, and protein tyrosine phosphatase non-receptor type 2 (PTPN2), factor B, and vaccinia-related kinase 1 (VRK1) showed highly differential expressions.Material and MethodsIn this study, serum and bronchoalveolar lavage fluid samples were collected from patients with silicosis and healthy people to verify the expression of PTPN2, factor B, and VRK1. The diagnostic value of differentially expressed proteins for silicosis was judged.ResultsThe expression levels of serum PTPN2, VRK1, and factor B in patients with silicosis were significantly higher than those in the control group (p < 0.01). Higher serum PTPN2 and factor B concentrations significantly and negatively correlated with the ratio of forced expiratory volume in 1 s to forced vital capacity (FEV1/FVC), maximum vital capacity (VCmax), FEV1, and FVC, suggesting that the high expression of PTPN2 and factor B is associated with decreased pulmonary ventilation function and restrictive ventilatory impairment in patients with silicosis. All area under curve (AUC) measurements generated from single detection events were >0.744, with PTPN2 reaching the highest value (0.858). The AUC, sensitivity, and specificity for the combined diagnosis using factor B and PTPN2 were 0.907, 86.91% and 85.07%, respectively, for factor B and PTPN2. The 3 differentially expressed proteins are potential classes of predictive biomarkers for silicosis.ConclusionsRegarding the economy and test practicality, the best diagnostic combination is factor B and PTPN2 for the analysis of AUC, sensitivity and specificity.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2021, 34, 4; 527-540
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Myocardial remodeling in rats with metabolic syndrome: role of Rho-kinase mediated insulin resistance
Autorzy:
Li, Chuan-Bao
Li, Xiao-Xing
Chen, Yu-Guo
Gao, Hai-Qing
Bao, Cheng-Mei
Liu, Xiang-Qun
Bu, Pei-Li
Zhang, Juan
Zhang, Yun
Ji, Xiao-Ping
Powiązania:
https://bibliotekanauki.pl/articles/1039743.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Rat
Metabolism
Myocardium
Phosphorylation
Insulin resistance
Opis:
Insulin resistance (IR) plays a critical role in metabolic syndrome (MS). Previous studies have demonstrated that activated ROCK is increased in MS patients. However, the effect of Rho-kinase (ROCK) on IR has not been definitely determined. Thus, the aims of the present study were to determine whether ROCK activation induces IR or affects myocardial structure and function, as well as the possible mechanisms underlying this process. Wistar rats fed high fat, high glucose and high salt diet sewed as model of MS and we used transmission electron microscopy, echocardiogram technology, and terminal deoxynucleotidyl transferase-mediated DNA nick-end labeling staining to identify any myocardial damage. The protein levels of MYPT-1 (characteristic of ROCK activation), IRS-1 and AKT were analyzed by immunohistochemistry and Western blotting. In hearts from MS rats, we found increased protein levels of phospho-MYPT-1 and phospho-IRS-1 (Ser307) and decreased phospho-AKT compared to levels in normal rats. In conclusion, the results suggest that ROCK-mediated IR is involved in the development of myocardial impairments in MS rats and that this effect is mediated probably via the IRS-1/PI3-kinase/AKT pathway.
Źródło:
Acta Biochimica Polonica; 2012, 59, 2; 249-254
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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