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Wyświetlanie 1-15 z 21
Tytuł:
Effect of Strut Thickness on Room and High Temperature Compressive Properties of Block-Type Ni-Cr-Al Powder Porous Metals
Autorzy:
Kang, B.-H.
Park, M.-H.
Lee, K.-A.
Powiązania:
https://bibliotekanauki.pl/articles/355591.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ni-Cr-Al
powder porous metal
strut thickness
high temperature
compressive behavior
Opis:
This study investigated the effect of strut thickness on the room and high temperature compressive properties of block-type Ni-Cr-Al powder porous metals with ~3000 μm pore size manufactured using a new powder process. Two block-type Ni-Cr-Al porous metals with different strut thicknesses were manufactured. The strut thicknesses of two block foams were 340 μm (A) and 383 μm (B), respectively. Room temperature, 500°C, 650°C and 800°C compressive tests were performed. The compressive results identified typical elastic, plateau and densification regions of foam material in all temperature conditions. Regardless of the strut thickness, compressive strength (maximum peak stress) decreased as deformation temperature increased. In all deformation temperature ranges, the compressive strength measured higher in the porous metal with greater strut thickness (B). The high temperature deformation behavior of powder porous metal was confirmed to be affected by the structural factor and microstructural factor of the porous metal. With the findings described above, this study also discussed the high temperature deformation mechanism of the Ni-Cr-Al metal foam based on fracture surfaces after the high temperature compressions.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1329-1334
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation And Stabilization Of Silver Nanoparticles In Ethanol By Phosphinic Acid
Redukcja i stabilizacja nanocząstek srebra w etanolu przez kwas fosforowy
Autorzy:
Kim, J.-K.
Shim, H.-M.
Park, M. J.
Koo, K.-K.
Powiązania:
https://bibliotekanauki.pl/articles/356073.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silver
nanoparticle
kinetic analysis
phosphinic acid
reduction
srebro
nanocząstki
analiza kinetyczna
kwas fosforowy
redukcja
Opis:
Although phosphinic acid (H3PO2) has a powerful reduction potential, the reduction of silver ions by phosphinic acid salt has not yet been reported. In this work, colloidal silver has successfully synthesized by reducing silver ions in ethanol with phosphinic acid as a reducing agent. The effects of [AgNO3]/[H3PO2] ratios and reaction temperature were considered. Spherical silver nanoparticles with cubic structure were successfully prepared and their diameters were measured to be 8.5±0.9 nm − 11.3±0.2 nm. Half-life analysis showed that the reduction of silver ions proceeded with the reaction order of 1.30 on concentration of phosphinic acid and activation energy of 120.7 kJ/mol.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1293-1296
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the stator inductances of the expanded Park model and an approach on parameter identification using the evolution strategy
Autorzy:
Schmuelling, Ch.
Kreischer, Ch.
Gołebiowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/141147.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
evolution strategy
FEM
Park equations
Park theory
synchronous machines
transients
Opis:
Commonly, the Park model is used to calculate transients or steady-state operations of synchronous machines. The expanded Park theory derives the Park equations from the phase-domain model of the synchronous machine by the use of transformations. Thereby, several hypothesis are made, which are under investigation in this article in respect to the main inductances of two different types of synchronous machines. It is shown, that the derivation of the Park equations from the phase-domain model does not lead to constant inductances, as it is usually assumed for these equations. Nevertheless the Park model is the most common analytic model of synchronous machines. Therefore, in the second part of this article a method using the evolution strategy is shown to obtain the parameters of the Park model.
Źródło:
Archives of Electrical Engineering; 2016, 65, 3; 585-599
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Hydrophobic Surgical Forceps using Powder Injection Molding and Surface Treatment
Autorzy:
Park, D. Y.
Park, B. R.
Gal, C. W.
Lin, D.
Han, J. S.
Jeong, M.-S.
Bollina, R.
Hwang, W.
Park, S. J.
Powiązania:
https://bibliotekanauki.pl/articles/352093.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
powder injection molding
hydrophobic
debinding
sintering
surface treatment
Opis:
Hydrophobic surgical forceps of end-effectors for laparoscopic operations or minimally invasive surgery were developed through powder injection molding (PIM) and surface treatment. Processing conditions for mixing, debinding, and sintering were investigated to produce defect-free components. An optimum solid loading was determined by torque rheometry experiments. The optimized processing conditions for debinding and sintering were designed through the measurement of weight loss and shrinkage behavior by thermogravimetric analysis and dilatometry experiments. After producing the surgical forceps based on the optimized processing conditions via PIM, surface treatment was carried out to generate the hydrophobic structure on the surface.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 473-480
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Trendelenburg position and pneumoperitoneum treatment on gastroesophageal reflux in dogs
Autorzy:
Park, Y.T.
Nogami, M.
Okano, S.
Powiązania:
https://bibliotekanauki.pl/articles/2087870.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Polish Journal of Veterinary Sciences; 2017, 4; 823-826
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Allometric scaling of marbofloxacin pharmacokinetics: a retrospective analysis
Autorzy:
Yohannes, S.
Hossain, M.A.
Kim, J.Y.
Lee, S.J.
Kwak, D.M.
Suh, J.W.
Park, S.C.
Powiązania:
https://bibliotekanauki.pl/articles/31939.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The association between physiologically dependent pharmacokinetic parameters (CLB, T1/2β, Vdss) of marbofloxacin and body weight was studied in eight animal species based on allometric equation Y = aWb, where ‘Y’ is the pharmacokinetic parameter, ‘W’ is body weight, ‘a’ is allometric coefficient (intercept) and ‘b’ is the exponent that describes relation between pharmacokinetic parameter and body weight. The body clearance of marbofloxacin has shown significant (P<0.0001) relation with size (Bwt) in various animal species. However, half-life and volume of distribution were not in association with body weight. Although half-life and volume of distribution were not in a good correlation with body weight, statistically significant association between the body clearance and body weight suggests validity of allometric scaling for predicting pharmacokinetic parameters of marbofloxacin in animal species that have not been studied yet. However further study considering large sample size and other parameters influencing pharmacokinetics of marbofloxacin is recommended.
Źródło:
Polish Journal of Veterinary Sciences; 2014, 17, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Miejsca święte w zielonych przestrzeniach publicznych
Sacred places in public open green areas
Autorzy:
Trojanowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/131799.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
miejsce święte
park terapeutyczny
uniwersalny wzorzec projektowania
zielona przestrzeń publiczna
public open green areas
sacred place
therapeutic park
universal patterns of design
Opis:
W artykule zaprezentowano różne wzory projektowania sacrum w zielonych przestrzeniach publicznych, jak również Uniwersalny wzorzec parku o właściwościach terapeutycznych. Jako przykład omówiono kompleks zielonych przestrzeni publicznych w Wejherowie, utworzony przez Kalwarię Wejherowską i Park im. A. Majkowskiego.
Wersja angielska streszczenia. This paper presents various patterns of design of the Sacred Places along with the Universal Pattern of Design for Therapeutic Parks. Second part of this paper presents assessment of therapeutic qualities of public open green areas in Wejherowo, composed of The Calvary of Wejherowo and Public Park named after A. Majkowski.
Źródło:
Teka Komisji Urbanistyki i Architektury Oddział PAN w Krakowie; 2018, 46; 419-429
0079-3450
2450-0038
Pojawia się w:
Teka Komisji Urbanistyki i Architektury Oddział PAN w Krakowie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tereny zieleni a ceny nieruchomości mieszkaniowych w Poznaniu
Green Areas and Housing Prices in Poznań
Autorzy:
Szczepańska, M.
Maćkiewicz, B.
Dziewiatowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/2031725.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cytadela Park
green areas
housing prices
Poznań
real estate market
Opis:
Korzystne oddziaływanie terenów zieleni w obszarach zurbanizowanych obejmuje wpływ na bioróżnorodność, oczyszczanie powietrza, zmniejszanie natężenia uciążliwego hałasu, stabilizację klimatu miejskiego oraz redukcję temperatury w miastach – wyspach ciepła [Chiesura 2004; Gill et al. 2007; Chen, Jim 2008; Kattwinkel et al. 2011; Schwarz et al. 2011; Liu, Li 2012]. Dostępne źródła wskazują również na istotną rolę, jaką odgrywają tereny zie- leni publicznej w obszarach zurbanizowanych, przyczyniając się do poprawy zdrowia i samopoczucia mieszkańców [Tzoulas et al. 2007] oraz zmniejszenia zmęczenia [Cohen et al. 2007]. Tereny zieleni są także miejscem spotkań – korzystnie wpływają na możliwości współdziałania społeczności sąsiedzkich i lokalnych [Kaźmierczak 2013] oraz podnoszą walory estetyczne terenów zurbanizowanych [James et al. 2009]. Jednak w Polsce nie ma osobnego aktu prawnego, który regulowałby szczegółowo kwestie związane z terenami zie- leni. Analiza aktów prawnych w zakresie pojęcia tereny zieleni i brak jedno- znacznych kryteriów delimitacji tych obszarów pozwala stwierdzić, że pojęcie to jest jednym z najmniej precyzyjnych terminów stosowanych w polskim planowaniu przestrzennym [por. Ustawa Prawo Budowlane z 7 lipca 1994 r., Ustawa o ochronie przyrody z 16 kwietnia 2004 r., Ustawa o planowaniu i zagospodarowaniu przestrzennym z 27 marca 2003 r.]. Nieprecyzyjność pojęcia spowodowała, że zieleń stała się niezobowiązującym elementem pla- nowania przestrzennego, często niewygodnym, co przekłada się na charakter przestrzeni współczesnego miasta w Polsce.
The marketing activities of developers assume the existence of relationship between attractiveness of the property and the proximity of green areas in its neighborhood. However, the question is about the true nature of this relationship in the local real estate market. The study attempts to identify the impact of green areas on the Poznań residential real estate market. For this purpose, in this work used the assumptions proposed by Crompton [2001, 2005] to define three zones of impact of the Cytadela Park on the real estate market. In addition, a survey was conducted among clients of a real estate agency who were seeking apartments to identify their opinion about the influence of green areas on the price of the property, including the impact of the Cytadela Park. The study found that green areas have a clear impact primarily on location decisions and marketing activity of developers. This is reflected in the difference in average asking prices of real estate between the primary market and the secondary, especially in the area of nearest neighborhood of the park (33%). Prices in the primary market are growing towards the Cytadela Park, while prices on the secondary market behave the opposite – are increasing towards the Piątkowo and the Old Town. The lack of clear and strong relationship between real estate market and green areas was confirmed by a survey. Among the respondents less than 40% were willing to pay more for a property located in close proximity to the green area. However, in this group of respondents, over 60% declared their willingness to bear the cost of 6-10% higher for the property located in a park setting.
Źródło:
Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN; 2017, 266; 142-158
0079-3493
Pojawia się w:
Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Life Time of the Dimensionally Stable Anode for Copper Electroplating Applications
Autorzy:
Son, S. H.
Park, S. C.
Lee, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/356684.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dimensionally stable anode
surface treatment
life time
copper
electrodeposition
Opis:
In order to enhance the long-term stability of DSA for copper electroplating process, in the present study, noble metal oxides with excellent electrochemical properties was used and optimum condition was determined the ratio of noble metal oxides, surface pre-treatment of titanium substrate and heat treatment. The effect of the surface pretreatment of titanium substrate and ratio of noble metal oxides were estimated by accelerated test at the highly current density conditions. The lifetime of DSA increase six-fold higher as the oxide thickness of Ta 7 : Ir 3 composition ratio. Under the optimal condition, surface pretreatment led to dramatic increase in the lifetime of DSA.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1019-1022
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Substituted Elements on Reflection Loss of Ba-Ferrite Nanoparticle
Autorzy:
Yang, S.
Jeong, K.-P.
Park, S.-Y.
Kim, J.-G.
Powiązania:
https://bibliotekanauki.pl/articles/352041.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ba ferrite
substitutional m-type ferrite
reflection loss
sol-gel
additional atom
Opis:
Due to the rapid development of the information communication industries, it is expected that next-generation mobile communication devices in the data communication environment will be used at the same time in the L~X band (1–12 GHz). To mutual electric wave interference prevention, research on wave absorbers in L~X band is needed. In this paper, barium ferrite was researched as L~X band wave absorber. The Barium ferrite (BaM, Ba ferrite) substituted by divalent ions (Co2+, Cu2+, Ni2+, Zn2+) and tetravalent ion (Ti4+). The substituted Ba ferrite nanoparticles were fabricated by sol-gel process. Lattice parameter, particle size, magnetic properties, and reflection loss were analyzed by X-ray diffraction (X-RD), a Vibrating Sample Magnetometer (VSM), and a Network Analyzer. Lattice parameter of Ba ferrite was changed 0.0005 to 0.0078 Å in a-b direction, and 0.0187 to0.0445 Å in c-direction by substituted elements, and it influenced on magnetic anisotropy. In addition, Co-Ti substitution elements influenced that coercive force decrease 5,739 to 2,240 Oe. Moreover, reflection loss frequencies were shifted from 16.3 GHz to 14.4 and 17.4 GHz by substituted elements Co-Ti and Zn-Ti.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1201-1204
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pharmacokinetics and pharmacodynamics (PK/PD) of irbesartan in Beagle dogs after oral administration at two dose rates
Autorzy:
Carlucci, L.
Song, K.H.
Yun, H.I.
Park, H.J.
Seo, K.W.
Giorgi, M.
Powiązania:
https://bibliotekanauki.pl/articles/31017.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Irbesartan (Irb) is an angiotensin II type 1 receptor antagonist widely used in humans to treat hypertension. Age-related diseases such as hypertension are increasingly being diagnosed in dogs and there is the need for new drugs. The PK/PD of Irb was tested in Beagle dogs. Ten healthy Beagles were orally administered two dose rates (2 and 5 mg/kg), according to a cross over study design. Blood collections for PK analysis and systolic blood pressure (SBP), heart and respiratory rate, mucous membranes colour, capillary refill time and temperature evaluations were performed at scheduled intervals. The drug plasma concentration was dose dependent. The dogs administered 5 mg/kg showed a significant reduction in SBP, while in those receiving 2 mg/kg, this parameter was minimally affected. A counter clockwise hysteresis showed no direct correlation between SBP and plasma concentrations. The minimum effective concentration was theorized to be within the range 550-800 ng/mL. Although further studies are necessary, 5 mg/kg seems to be the more appropriate dose to obtain a hypotensive effect in Beagle dogs.
Źródło:
Polish Journal of Veterinary Sciences; 2013, 16, 3
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Cladding Hull Wastes from Used Nuclear Fuels
Charakterystyka odpadów z okładzin reaktora wodnego ciśnieniowego
Autorzy:
Kang, K. H.
Lee, C. H.
Jeon, M. K.
Han, S. Y.
Park, G. I.
Hwang, S.-M.
Powiązania:
https://bibliotekanauki.pl/articles/357036.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
used nuclear fuels
metal waste
cladding hulls
zircaloy
radioactivity
reaktor wodny ciśnieniowy
odpady metalowe
odpady z okładzin
radioaktywność
Opis:
Used cladding hulls from pressurized water reactor (PWR) are characterized to provide useful information for the treatment and disposal of cladding hull wastes. The radioactivity and the mass of gamma emitting nuclides increases with an increase in the fuel burn-up and their removal ratios are found to be more than 99 wt.% except Co-60 and Cs-137. In the result of measuring the concentrations of U and Pu included in the cladding hull wastes, most of the residues are remained on the surface and the removal ratio of U and Pu are revealed to be over 99.98 wt.% for the fuel burn-up of 35,000 MWd/tU. An electron probe micro-analyzer (EPMA) line scanning shows that radioactive fission products are penetrated into the Zr oxide layer, which is proportional to the fuel burn-up. The oxidative decladding process exhibits more efficient removal ratio of radionuclides.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1199-1203
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication of High-Strength Gray Cast Iron Using Permanent Magnet Scrap
Autorzy:
Park, S.-Y.
Kim, J. H.
Seo, S. J.
On, J. S.
Lim, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/352204.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gray cast iron
rare earth element
Nd-Fe-B magnet scrap
graphite formation
microstructure
Opis:
In this study, we have developed the manufacturing technology for high strength gray cast irons by using the spent permanent magnet scraps. The cast specimen inoculated by using a spent magnet scraps showed the excellent tensile strength up to 306MPa. This tensile strength value is 50MPa higher than that of the specimen cast without inoculation, and is similar to that of the specimen inoculated by using the expensive misch-metal. These superior mechanical properties are attributed to complex sulfides created during solidification that promote the formation and growth of Type-A graphite. It is therefore concluded that spent magnets scrap can provide an efficient and cost-effective inoculation agent for the fabrication of high-performance gray cast iron.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1113-1117
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Characterization of CoCrFeNiMn High Entropy Alloy Powder Processed by Gas Atomization
Autorzy:
Park, T. G.
Lee, S. H.
Lee, B.
Cho, H. M.
Choi, W. J.
Kim, B. S.
Shin, K. S.
Kim, T.-S.
Powiązania:
https://bibliotekanauki.pl/articles/353649.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high entropy alloy
gas atomization
spark plasma sintering
CoCrFeNiMn
Opis:
In this study, precisely controlled large scale gas atomization process was applied to produce spherical and uniform shaped high entropy alloy powder. The gas atomization process was carried out to fabricate CoCrFeNiMn alloy, which was studied for high ductility and mechanical properties at low temperatures. It was confirmed that the mass scale, single phase, equiatomic, and high purity spherical high entropy alloy powder was produced by gas atomization process. The powder was sintered by spark plasma sintering process with various sintering conditions, and mechanical properties were characterized. Through this research, we have developed a mass production process of high quality and spherical high entropy alloy powder, and it is expected to expand applications of this high entropy alloy into fields such as powder injection molding and 3D printing for complex shaped components.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 1055-1059
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure Development of Spark Plasma Sintered Ti-Nb Alloy by Heat Treatment
Autorzy:
Haq, M. A.
Abbas, S. F.
Eom, N. S. A.
Kim, T. S.
Lee, B.
Park, K.-T.
Kim, B. S.
Powiązania:
https://bibliotekanauki.pl/articles/355593.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TiNb alloy
Spark plasma sintering
Heat treatment
Microstructure
β-phase titanium
Opis:
The β-phase Titanium (β-Ti) alloys have been under the spotlight in the recent past for their use as biomedical prosthetic materials owing to their excellent properties such as low elastic modulus, high corrosion resistance and tensile strength. Recently, Niobium (Nb) has gained a lot of attention as a β-phase stabilizing element in Ti alloys to replace Vanadium (V) due to its excellent solubility in Ti, low elastic modulus and biocompatibility. In this work, low cost Ti-20Nb binary alloy has been fabricated via powder metallurgy procedures. The blended powder mixtures of Ti and Nb were sintered at 900°C for 20 mins by the Spark Plasma Sintering (SPS) with an applied uniaxial pressure of 40 MPa. The heating rate was fixed at 50°C/min. The sintered alloy was subject to heat treatments at 1200°C in vacuum condition for various time durations. The characterizations of microstructure obtained during this process were done using FE-SEM, EDS and XRD. By increasing heat treatment time, as understood, the volume of residual Nb particles was decreased resulting in accelerated diffusion of Nb into Ti. Micro hardness of the alloy increased from 340 to 355 HV with the increase in β phase content from 30 to 45%. The resultant alloys had relatively high densities and homogenized microstructures of dispersed lamellar β grains in α matrix.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1429-1432
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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