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Journal articles on the topic 'Ultrafond'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 January 2023

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1

Stapleton, Emma, and Pablo Ruiz-Rudolph. "The potential for indoor ultrafine particle reduction using vegetation under laboratory conditions." Indoor and Built Environment 27, no. 1 (2016): 70–83. http://dx.doi.org/10.1177/1420326x16668388.

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Ultrafine particle pollution is a health concern in indoor and outdoor settings. Reducing ultrafine particle exposure and concentrations in populated areas is therefore an important research topic. Our study assesses the effectiveness of plants to decrease ultrafine particle concentrations in indoor environments. Ambient ultrafine particle concentrations were measured for three hours in and outside a polycarbonate chamber with and without plants using a condensation particle counter. Reduction in ambient ultrafine particle levels between blanks and treatments of 11 plant species were compared

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2

Sakamoto, Satoshi, Tomonori Kano, Mitsugu Yamaguchi, et al. "Microgrooving Using an Ultrafine Wire Tool." Advanced Materials Research 652-654 (January 2013): 2164–68. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.2164.

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We examined the slicing technique of silicon wafers with little kerf loss using an ultrafine wire tool. As the first step, we performed microgrooving with an ultrafine wire tool. The thinning of the wafer and the decrease in kerf loss can minimize production costs. We discuss the strength characteristics and the microgrooving performance of the ultrafine wire tool. The main results are as follows. The relative velocity greatly affects the grooving properties. The ultrafine wire tool easily breaks when the relative speed is high. When the ultrafine wire tool and abrasives with large diameter gr

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3

Liu, Tao, Jianfeng Fan, and Ziqiang Peng. "Mechanical Properties, Dry Shrinkage, and Water Penetration of Reusing Fine and Ultrafine Recycled Concrete Aggregate." Materials 15, no. 24 (2022): 8947. http://dx.doi.org/10.3390/ma15248947.

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The effect of fine and ultrafine recycled concrete aggregate (RCA) on road construction still lacks investigation. This study investigates the properties of fine and ultrafine RCA, further, the influence of the different proportions of ultrafine RCA on the long-term performance of the designed matrix. The fine and ultrafine RCA are thoroughly characterized. Simultaneously, the mechanical properties, shrinkage properties, and water penetration of the designed matrix are evaluated. The results indicate that RCA shows low density, high porosity, and high water absorption. Furthermore, elevated ul

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4

Zhou, Ming, and Yan Wen Tian. "Ionic Conductivity Measurements of LaF₃ Polycrystalline Powders." Materials Science Forum 663-665 (November 2010): 678–81. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.678.

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With the help of impedance spectroscopy, the complex impedances of three kinds of ultrafine LaF3 polycrystalline powders (industrial grade LaF3 polycrystalline powder, ultrafine LaF3 polycrystalline powder prepared with sol-gel technique, and ultrafine LaF3 polycrystalline powder prepared with microwave method) were measured, and their ionic conductivities were derived. It is found that the ionic conductivities of the industrial grade LaF3 polycrystalline powder and the ultrafine LaF3 polycrystalline powder prepared with microwave method are higher than that of the ultrafine LaF3 polycrystalli

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5

Tlebaev, K. B. "MODIFICATION OF POLYTETRAFLUOROETHYLENE ON THE BASE OF ULTRAFINE POWDER." Eurasian Physical Technical Journal 18, no. 3 (37) (2021): 25–29. http://dx.doi.org/10.31489/2021no3/25-29.

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This paper presents the results of a study of the influence of thermal and mechanical effects on the formation of a structure in an ultrafine powder heated to a temperature above the melting point of polytetrafluoroethylene (327°C). The ultrafine powder was obtained by mechanical grinding of an industrial sample of polytetrafluoroethylene in a rotary knife mill. Studies of the ultra powder with a transmission microscope showed that the powder particles are quasi-spherical particles of a size of 5 microns. The thermal (sintering, slow and fast quenching) and mechanical (creation of high pressur

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6

Sato, Yutaka S., M. Urata, Y. Kurihara, et al. "Microstructural Evolution during Friction Stir Welding of Ultrafine Grained Al Alloys." Materials Science Forum 503-504 (January 2006): 169–74. http://dx.doi.org/10.4028/www.scientific.net/msf.503-504.169.

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Recently, several metallic materials with ultrafine-grained structures and characterized by high strength and toughness have been developed. When these ultrafine-grained materials are practically used, welding and joining processes are required. However, conventional fusion welding processes result in deterioration of the good mechanical properties of these ultrafine-grained materials due to the drastic grain growth of the ultrafine grains. On the other hand, friction stir welding (FSW) is a solid-state joining process having lower heat-input than fusion welding processes, enabling formation o

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7

Zhogashtiev, N. "Electron Microscopic Study of Carbon Powders and Their Composites." Bulletin of Science and Practice 6, no. 3 (2020): 44–48. http://dx.doi.org/10.33619/2414-2948/52/05.

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Primary ultrafine carbon powders were obtained using the sol-gel method and drying in a supercritical fluid using various carbon raw materials. By heat treatment at 1000–1100 °C, ultrafine carbon powders were obtained. The properties of primary ultrafine carbon powders and their annealing products were studied using a Tescan Vega 3 SEM scanning electron microscope (SEM). The results show that the starting materials affect the structure of the resulting ultrafine carbon powders.

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8

Zhang, Shengli, Yuqi Zhou, Jianwei Sun, and Fanghui Han. "Effect of Ultrafine Metakaolin on the Properties of Mortar and Concrete." Crystals 11, no. 6 (2021): 665. http://dx.doi.org/10.3390/cryst11060665.

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This study investigated the influence of ultrafine metakaolin replacing cement as a cementitious material on the properties of concrete and mortar. Two substitution levels of ultrafine metakaolin (9% and 15% by mass) were chosen. The reference samples were plain cement concrete sample and silica fume concrete sample with the same metakaolin substitution rates and superplasticizer contents. The results indicate that simultaneously adding ultrafine metakaolin and a certain amount of polycarboxylate superplasticizer can effectively ensure the workability of concrete. Additionally, the effect of a

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9

Du, Gao Xiang, Wei Juan Guo, Li Bing Liao, Qiang Xue, Nan Wang, and Jian Wei Ban. "Preparation of Ultrafine White Cement and its Hydration." Materials Science Forum 686 (June 2011): 448–53. http://dx.doi.org/10.4028/www.scientific.net/msf.686.448.

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The ultrafine grinding of white cement and its hydration were studied. The ultrafine grinding parameters, such as crushing pressure and feeding pressure of jet mill in a lab scale were optimized. The influence of the particle size distribution of ultrafine white cement and the usage of water reducer on the standard thickness and early age strength of white cement paste was investigated. The results indicated that the ultrafine white cement with d50=4.62 µm and d90=10.48 µm can be obtained when the crushing pressure was 0.7 MPa and the feeding pressure was 0.4 MPa. The standard thickness of whi

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10

Xu, Teng Zhou, Zhao Feng Chen, Jie Ming Zhou, Xue Yu Cheng, Wang Ping Wu, and Zhou Chen. "Ultrafine Glass Fiber Core Material Produced by Wet Method." Advanced Materials Research 430-432 (January 2012): 1343–47. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1343.

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Glass fibers have non-flame, non-toxic, antisepsis, light volume-weight, low heat conduction factor, good chemistry stability, low water absorption coefficient and good hydrophpbic coefficient. In this paper, ultrafine glass fiber core material was produced by wet method. Performances of ultrafine glass fiber core material and VIP were introduced. The thermal conductivities of ultrafine glass fiber core material is about 0.02966 W/(m•K). Ultrafine glass fiber core material with about 92%-98% porosity ratios makes it easy to reach high vacuum degree for VIP. The thermal insulating capacity of V

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11

Jin, M., A. M. Minor, D. Ge, and J. W. Morris. "Study of Deformation Behavior of Ultrafine-grained Materials Through in Situ Nanoindentation in a Transmission Electron Microscope." Journal of Materials Research 20, no. 7 (2005): 1735–40. http://dx.doi.org/10.1557/jmr.2005.0216.

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The mechanical properties of ultrafine-grained and nanograined materials have received a great deal of recent attention because of their unusual and promising values. However, some of the most important mechanisms of deformation remain unclear. In this work, the deformation behavior of ultrafine-grained Al films and ultrafine-grained Fe is studied through in situ nanoindentation in a transmission electron microscope. Deformation-induced coarsening by grain boundary migration was observed in the ultrafine-grained Al films during deformation at room temperature, whereas no grain boundary motion

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12

Okajima, Junnosuke, Sangkwon Jeong, and Shigenao Maruyama. "Evaluation of Cooling Performance of Ultrafine Cryoprobes: Effect of Probe Structure on Thermodynamic Properties of Refrigerant." International Journal of Air-Conditioning and Refrigeration 26, no. 02 (2018): 1850020. http://dx.doi.org/10.1142/s2010132518500207.

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In this study, the effect of the structure of an ultrafine cryoprobe on its cooling performance was evaluated experimentally and numerically. To clarify the thermodynamic characteristics of the refrigerant in the ultrafine cryoprobe, three ultrafine cryoprobes with different dimensions were manufactured. Additionally, a phase change flow model was developed to estimate the refrigerant condition in a microchannel and evaluate the cooling characteristics of an ultrafine cryoprobe. For validating the numerical model, the results were compared with experimental data and a suitable empirical correl

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13

XU, Wenzheng, Hao LI, Xin LIANG, Jie WANG, Jinyu PENG та Jingyu WANG. "β-hexanitrohexaazaisowurtzitane Particles Prepared by Spray Drying and its Characterization". Materials Science 27, № 1 (2021): 119–24. http://dx.doi.org/10.5755/j02.ms.22853.

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In this paper, the ultrafine β-hexanitrohexaazaisowurtzitane (β – CL – 20) particles were prepared by spray drying method. The CL – 20 samples were characterized by scanning electron microscope (SEM), particle size analyzer, X-ray diffraction (XRD), and Differential Scanning Calorimeter (DSC). Furthermore, the safety properties of samples under impact and thermal stimulus were tested and analyzed. The results of SEM showed that the average particle size of ultrafine CL – 20 particles with a narrow particle size distribution, were about 320 nm, and the shape was elliptical. The XRD patterns ind

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14

Hara, K., K. Osada, C. Nishita-Hara, et al. "Seasonal features of ultrafine particle volatility in the coastal Antarctic troposphere." Atmospheric Chemistry and Physics Discussions 11, no. 5 (2011): 14777–99. http://dx.doi.org/10.5194/acpd-11-14777-2011.

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Abstract. The size distribution and volatility of ultrafine aerosol particles were measured using scanning mobility particle sizer and thermodenuder at Syowa Station during the 46–47 Japanese Antarctic Research Expeditions (2005–2007). The relative abundance of non-volatile particles in a 240 C scan was approximately 20 % during the summer, whereas the abundance of non-volatile particles increased by >90 % during winter–spring. During the summer, most ultrafine particles were NH4+, SO42− and CH3SO3−, while major constituents of ultrafine particles were sea-salts (Na+ and Cl−) in winter–spri

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15

Hu, Peng Yi, Ying Ying Gong, Guo Song Zhang, et al. "Comparative Study of Physicochemical Properties of Compound Danshen Powders." Advanced Materials Research 988 (July 2014): 300–304. http://dx.doi.org/10.4028/www.scientific.net/amr.988.300.

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Compare investigate physicochemical properties of coarse powder and four ultrafine powders of compound Danshen, and then to determinate particle size distribution for ultrafine powders. Surface morphology, bulk density , repose angle, the content of ethanol-soluble extract and water-soluble extract of compound Danshen powders were investigated. The content of salvianolic acid B, tanshinone IIA, tanshinone I, cryptotanshinone, notoginsenoside R1,ginsenoside Rg1 and ginsenoside Rb1 in compound Danshen powders were determined by HPLC. The results indicated that powder particle size decreased grad

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16

Umemoto, M., M. Udaka, K. Kawasaki, and X. D. Liu. "Formation of ultrafine powders of binary alloy systems by plasma jet." Journal of Materials Research 13, no. 6 (1998): 1511–16. http://dx.doi.org/10.1557/jmr.1998.0210.

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Recently, a new method, i.e., a plasma jet method, was developed in our lab for the production of ultrafine powders. In the present work, we investigated the formation of binary Al–Fe, Al–Si, Fe–Si, Al–Cu, Al–Ni, Ni–Ti, Fe–Cu, and Fe–Ti ultrafine powders using this method. Premixed pure elemental powders of various compositions of Al–Fe, Al–Si, Fe–Si, Al–Cu, Al–Ni, Ni–Ti, Fe–Cu, and Fe–Ti were used as starting materials. These premixed powders were injected into the plasma jet of Ar–N2 working gas to form ultrafine powders. The obtained ultrafine powders were characterized by x-ray diffraction

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17

Yuan, Yi Gao, Jian Jun Ding, Yan Kun Wang, and Wei Quan Sun. "Fabrication of Functionally Gradient Ultrafine-Grained WC-Co Composites." Applied Mechanics and Materials 423-426 (September 2013): 885–89. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.885.

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The carburizing heat treatments of ultrafine-grained WC-Co composites with sub-stoichiometric carbon content were carried out, and the microstructures of ultrafine-grained WC-Co carbides before and after treated were characterized by means of scanning electron microscopy and X-ray diffraction. The results show that the functionally gradient ultrafine-grained WC-Co hardmetals with a Co depleted surface and not comprising the η-phase can be fabricated by carburizing heat treatment. After heat treatment, WC grain sizes in materials are still at the ultrafine grade.

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18

Li, Yijiang, Wencheng Xia, Yaoli Peng, Yanfeng Li, and Guangyuan Xie. "Effect of ultrafine kaolinite particles on the flotation behavior of coking coal." International Journal of Coal Science & Technology 7, no. 3 (2020): 623–32. http://dx.doi.org/10.1007/s40789-020-00304-5.

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Abstract Kaolinite, as a mineral in fine coal, has an important influence on the flotation of coal particles. In this study, the effects of ultrafine kaolinite particles on the flotation recovery of coal particles were investigated. Flotation tests were carried out using a mixture of coal particles and different amounts of ultrafine kaolinite particles. Combined with the Stefan–Reynold theory, the effect of liquid film drainage rate between coal bubbles in a kaolinite suspension was calculated. The yield of flotation clean coal increases quickly with the increasing content of ultrafine kaolini

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19

Xiong, Yan Fei, Jiang Yu, Chang Fu Xia, and Yan Feng Gao. "The Study on Ultrafine Explosives’ Sensitivity." Advanced Materials Research 631-632 (January 2013): 395–98. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.395.

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With high pressure spraying refinement technology of explosive, we obtain ultrafine powder of TATB and HMX. The middle diameter of them is 746 and 242 , that is to say those two kinds explosives belong to ultrafine explosive. Impact test indicate that the impact sensitivity of ultrafine TATB and HMX is decreasing in some degree. However the shock sensitivity is increased and the increased range is big. The end, we analyze this phenomenon and explain the reason that the ultrafine explosives` sensitivity is different form usual explosive in theory.

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20

Joo, Song-Yi, Ji-Hee Hwang, Seung-Hon Ham, and Ki-Young Lee. "Exposures of Ultrafine Particles for Passengers of Elephant Vehicle in the Seoul Grand Park." Korean Journal of Environmental Health Sciences 38, no. 5 (2012): 393–97. http://dx.doi.org/10.5668/jehs.2012.38.5.393.

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21

Adhikari, Atin, Aniruddha Mitra, Abbas Rashidi, Imaobong Ekpo, Jacob Schwartz, and Jefferson Doehling. "Field Evaluation of N95 Filtering Facepiece Respirators on Construction Jobsites for Protection against Airborne Ultrafine Particles." International Journal of Environmental Research and Public Health 15, no. 9 (2018): 1958. http://dx.doi.org/10.3390/ijerph15091958.

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Exposure to high concentrations of airborne ultrafine particles in construction jobsites may play an important role in the adverse health effects among construction workers, therefore adequate respiratory protection is required. The performance of particulate respirators has never been evaluated in field conditions against ultrafine particles on construction jobsites. In this study, respiratory protection levels against ultrafine particles of different size ranges were assessed during three common construction related jobs using a manikin-based set-up at 85 L/min air flow rate. Two NanoScan SM

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22

Yamawaki, Naoya, Hayato Okumura, Shigenori Akamatsu, Yusuke Nishiuchi, and Takashi Hata. "Study on the Method of Identifying Ultrafine Bubbles Using Ultrasound under the Presence of Solid Nanoparticles." MATEC Web of Conferences 333 (2021): 01001. http://dx.doi.org/10.1051/matecconf/202133301001.

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The method of making OH radicals generated by the collapse of ultrafine bubbles as an indicator when applying ultrasound was examined as the method of identifying ultrafine bubbles less than 1 μm in diameter under the presence of mixed solid nanoparticles. First, potassium iodide (KI) method was used to evaluate OH radicals. Since difference in absorbance due to OH radicals generated by the collapse of ultrafine bubbles is very small when using air as contained gas, evaluation using the KI method was difficult; however, a distinct difference in absorbance was confirmed by increasing the amount

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23

Torizuka, Shiro, and Eijiro Muramatsu. "High Strength Microscrew with Ultrafine Grained Structure." Materials Science Forum 783-786 (May 2014): 2695–700. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.2695.

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While uniform elongation is a measure of ductility of the material, reduction in area in tensile tests is also an important measure of ductility. It was found that the reduction in area - tensile strength balance is far better than the conventional ferrite+pearlite steels and even superior to martensitic and bainitic steels. Formability of ultrafine-grained steel is examined by applying to form a M1.7 micro screw using these ultrafine-grained steels. Screws are formed through the process of cold heading and rolling. Relationship between cold heading, rolling, uniform elongation and reduction i

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24

Hara, K., K. Osada, C. Nishita-Hara, et al. "Seasonal features of ultrafine particle volatility in the coastal Antarctic troposphere." Atmospheric Chemistry and Physics 11, no. 18 (2011): 9803–12. http://dx.doi.org/10.5194/acp-11-9803-2011.

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Abstract. The size distribution and volatility of ultrafine aerosol particles were measured using scanning mobility particle sizer and thermodenuder at Syowa Station during the 46–47 Japanese Antarctic Research Expeditions (2005–2007). The relative abundance of non-volatile particles in a 240 °C scan was approximately 20% during the summer, whereas the abundance of non-volatile particles increased by >90% during the winter–spring. Most ultrafine particles were volatilized at temperature of 150–210 °C. This volatility was consistent well to major aerosol constituents (NH4+, SO42− and CH3SO3−

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25

Yamawaki, Naoya, Hayato Okumura, Shigenori Akamatsu, Yusuke Nishiuchi, and Takashi Hata. "Study on the Method of Identifying Ultrafine Bubbles Using Ultrasound under the Presence of Solid Nanoparticles." MATEC Web of Conferences 333 (2021): 01001. http://dx.doi.org/10.1051/matecconf/202133301001.

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The method of making OH radicals generated by the collapse of ultrafine bubbles as an indicator when applying ultrasound was examined as the method of identifying ultrafine bubbles less than 1 μm in diameter under the presence of mixed solid nanoparticles. First, potassium iodide (KI) method was used to evaluate OH radicals. Since difference in absorbance due to OH radicals generated by the collapse of ultrafine bubbles is very small when using air as contained gas, evaluation using the KI method was difficult; however, a distinct difference in absorbance was confirmed by increasing the amount

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26

Wang, Huakun, Yishu Xu, Kai Zhang, et al. "Impacts of Nano SiO2 Addition on the Formation of Ultrafine Particulate Matter during Coal Combustion." Atmosphere 13, no. 10 (2022): 1624. http://dx.doi.org/10.3390/atmos13101624.

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Clay minerals composed of Si and Al could help reduce ultrafine particulate matter (PM) formation as an additive during coal combustion while currently unacceptable high adding dosages (normally 3–5 wt.%) are required due to their inadequate capture efficiency. To find additives that could effectively reduce the formation of ultrafine PM, coal combustion with a novel nano SiO2 additive (<100 nm) was performed to evaluate its effects on reducing ultrafine PM. The generated PM10 was sampled to characterize their particle size distribution, mass yield, size-resolved composition and micromorpho

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27

Pisesweerayos, Prasit, Somsak Dangtip, Pitt Supaphol, and Toemsak Srikhirin. "Electrically Conductive Ultrafine Fibers of PVA-PEDOT/PSS and PVA-AgNPs by Means of Electrospinning." Advanced Materials Research 1033-1034 (October 2014): 1024–35. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.1024.

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This research project produced two fabricated ultrafine conductive polymeric fibers. The first fiber was fabricated from a polymer and conductive polymer solution, and the second was fabricated from a polymer and metal nanoparticle/ nanocomposite. The resulting fibers were characterized and analyzed. For all fiber samples, the ultrafine polymeric fibers were fabricated using polyvinyl alcohol (PVA). The conductive polymer used in the first fiber sample was poly (3,4-ethylenedioxythiophene)/ polystyrene sulfonate (PEDOT/PSS). The conductive nanoparticles used in the second fiber sample were sil

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28

Periasamy, Ravindran, Fu-Lin Chen, David Ensor, Robert Donovan, and Robert Denyszyn. "Particles in High Pressure Cylinder Gases: Gas to Particle Conversion During Expansion." Journal of the IEST 31, no. 4 (1988): 20–25. http://dx.doi.org/10.17764/jiet.1.31.4.tq403v88424131p3.

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The formation of ultrafine particles by gas to particle conversion is hypothesized to explain the large concentration of ultrafine particles measured downstream of pressure reducing devices on cylinder gases of helium, nitrogen, and argon. These high concentrations of ultrafine particles can be reduced by the insertion of an appropriate purifying stage upstream of the pressure reducing device.

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Jiao, Y. L., L. Xiao, M. H. Zheng, X. H. Ma, Xin Tai Su, and Qing Zhi Yan. "Effect of Ultrafine Gd211 on Processing and Superconducting Properties of Gdbacuo Bulk Superconductors." Materials Science Forum 546-549 (May 2007): 1893–96. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1893.

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GdBaCuO bulk superconductors from precursors of Gd123 and ultrafine Gd211 powder have been fabricated by melt-textured-growth method in air. The ultrafine Gd211 powder was synthesized by an improved Pechini method. It was found that the lower temperature of synthesizing ultrafine Gd211 powder, the higher peritectic reaction temperature of GdBaCuO bulk superconductors. Jc reaches 4.7×104 A/cm2 at 77 K and self-field for ultrafine Gd211 starting particles with 0.2μm in diameter, and higher compared to larger Gd211 starting particles fabricated by solid state reaction. However, a large secondary

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Ning, Yong Quan, Ze Kun Yao, Hong Zhen Guo, Tao Yu, and Yi Wen Zhang. "Ultrafine-Grained Treatment Process on FGH4096 Alloy." Key Engineering Materials 407-408 (February 2009): 694–97. http://dx.doi.org/10.4028/www.scientific.net/kem.407-408.694.

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Ultrafine-grained treatment (multiple forging and heat treatment) were carried out on FGH4096 alloy to get ultrafine grain with grain being of 1-5μm. OM, SEM, TEM and tensile test were used to study the action of ultrafine-grained treatment on improving structure and properties. The tensile properties of the alloy processed under ultrafine-grained treated have shown quite satisfactory levels, which ultimate strength (UTS) reach 1730Mpa and yield strength (YS) values reach 1470Mpa at room temperature. The apperance of advanced strength has originated chiefly form not only the persence of fine g

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Zhao, Guo Wei, Chun Liu Wang, Zheng Gen Liao, Xin Li Liang, Yun Chao Cao, and Xu Long Chen. "Comparative Study of Physicochemical Properties of Dragon’s Blood Powders." Advanced Materials Research 311-313 (August 2011): 560–65. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.560.

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Compare investigate physicochemical properties of fine powder and two ultrafine powders of Dragon’s Blood, and then to determinate particle size distribution for ultrafine powders of Dragon’s Blood. Specific surface area and porosity, surface morphology and moisture absorption of Dragon’s Blood powders were investigated. The content and the in vitro dissolution of dracorhodin in Dragon’s Blood powders were determined by HPLC. The results showed that the content of dracorhodin had no significant difference among three Dragon’s Blood powders. With the decreasing of particle size the degree of mo

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Prasetya, Ahadi Damar, Muhammad Rifai, Ahmad Hasan As'ari, Mujamilah Mujamilah, and Hiroyuki Miyamoto. "ELECTROCHEMISTRY STUDY ON THE RELATIONSHIP BETWEEN GRAIN BOUNDARY STATE AND CORROSION BEHAVIOR OF ULTRAFINE GRAINED IRON CHROMIUM ALLOY." Jurnal Sains Materi Indonesia 21, no. 1 (2020): 41. http://dx.doi.org/10.17146/jsmi.2019.21.1.5640.

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ELECTROCHEMISTRY STUDY ON THE RELATIONSHIP BETWEEN GRAIN BOUNDARY STATE AND CORROSION BEHAVIOR OF ULTRAFINE GRAINED IRON CHROMIUM ALLOY. Research on stainless steel corrosion resistance continues to grow today. This reality cannot be separated from the needs of stainless steels in various fields, one of which is bio-implant. In this research, the effect of grain size on the corrosion behavior of iron-chromium (Fe-Cr) alloy was investigated. Coarse grain Fe-Cr alloy was first processed with equal channel angular pressing (ECAP) for eight cycles to obtain ultrafine grain structure. The coarse an

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Torizuka, Shiro, Eijiro Muramastu, and S. V. S. Narayana Murty. "Ultrafine Grained Steel Wire and its Formability." Materials Science Forum 710 (January 2012): 19–26. http://dx.doi.org/10.4028/www.scientific.net/msf.710.19.

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While uniform elongation is a measure of ductility of the material, reduction in area in tensile tests is also an important measure of ductility. Ultrafine-grained steels with different carbon contents from ultralow carbon to high carbon were produced through warm caliber rolling. It was found that the reduction in area- tensile strength balance is far better than the conventional ferrite+pearlite steels and even superior to martensite steels for all materials. Formability of ultrafine-grained steel is examined by applying to form a M 1.7 micro screw using these ultrafine-grained steels. Screw

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Cheng, Jialin, Yeling Yun та Jiaxin Rui. "Enhanced Tensile Plasticity in Ultrafine Lamellar Eutectic Al-CuBased Composites with α-Al Dendrites Prepared by Progressive Solidification". Applied Sciences 9, № 18 (2019): 3922. http://dx.doi.org/10.3390/app9183922.

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In this paper, a new class of Al-Cubased composites which combine the ultrafine lamellar eutectic matrix (α-Al + θ-Al2Cu) and micron-sized primary α-Al dendrites was prepared by progressive solidification. By adjusting the alloy composition and solidification process, the formation of favorable microstructural and micromechanical features can be achieved. The ultrafine lamellar eutectic composite Al94Cu6 exhibits excellent mechanical properties with 472 MPa fracture strength and 7.4% tensile plastic strain. The plasticity of the ultrafine lamellar eutectic composite relies on the volume fracti

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35

Pierce, J. R., and P. J. Adams. "Efficiency of cloud condensation nuclei formation from ultrafine particles." Atmospheric Chemistry and Physics Discussions 6, no. 6 (2006): 10991–1023. http://dx.doi.org/10.5194/acpd-6-10991-2006.

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Abstract. Atmospheric cloud condensation nuclei (CCN) concentrations are a key uncertainty in the assessment of the effect of anthropogenic aerosols on clouds and climate. The ability of new ultrafine particles to grow to become CCN varies throughout the atmosphere and must be understood in order to understand CCN formation. We have developed the Probability of Ultrafine particle Growth (PUG) model to answer questions regarding which growth and sink mechanisms control this growth, how the growth varies between different parts of the atmosphere and how uncertainties with respect to the magnitud

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Suo, Tao, Yu Long Li, Feng Zhao, and Kui Xie. "Temperature Effects on the Mechanical Behavior of Ultrafine-Grained Material." Materials Science Forum 667-669 (December 2010): 827–32. http://dx.doi.org/10.4028/www.scientific.net/msf.667-669.827.

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The quasi-static and dynamic compression experiments of ultrafine-grained copper fabricated by equal channel angular pressing method were performed at temperatures ranging from 77 to 573K. The influence of temperature on flow stress, strain hardening rate and strain rate sensitivity were investigated. The results show that the flow stress of ultrafine-grained copper shows much larger sensitivity to testing temperature than that of coarse grained copper. However, the temperature sensitivity of ultrafine-grained copper to true strain is comparative weaker than that of coarse grained copper. For

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Gao, Chongfeng, Yang Zhang, Yaoyao Cao, Weihua Xiao, and Lujia Han. "Effect of Ultrafine Grinding Pretreatment on the Cellulose Fibers and Nanocrystals from Wheat Straw." Journal of Biobased Materials and Bioenergy 14, no. 3 (2020): 369–75. http://dx.doi.org/10.1166/jbmb.2020.1962.

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To investigate the effect of ultrafine grinding pretreatment on the isolation of wheat straw cellulose fibers and nanocrystals, wheat straw at cellular scale (50–30 m) were produced with different ultrafine grinding time prior to extract cellulose fibers and nanocrystals. Cellulose fibers were obtained by 4% sodium hydroxide and alkaline hydrogen peroxide treatment from ultrafine ground wheat straw. Morphological changes were observed using scanning electron microscopy (SEM). Fourier transform infrared (FTIR) spectroscopy showed the removal of non-cellulosic components and the rearrangement of

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Uda, Masahiro. "Ultrafine particles." Journal of the Japan Welding Society 54, no. 6 (1985): 318–29. http://dx.doi.org/10.2207/qjjws1943.54.318.

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KATO, AKIO. "Ultrafine particles." Nihon Kessho Gakkaishi 31, no. 2 (1989): 116–18. http://dx.doi.org/10.5940/jcrsj.31.116.

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OHYA, Hitoshi, Mitsuru YAMAMOTO, and Hiroshi SAKAMOTO. "Ultrafine grinding." RESOURCES PROCESSING 36, no. 4 (1989): 195–204. http://dx.doi.org/10.4144/rpsj1986.36.195.

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Hayashi, Chikara. "Ultrafine particles." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 5, no. 4 (1987): 1375–84. http://dx.doi.org/10.1116/1.574773.

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Donaldson, K. "Ultrafine particles." Occupational and Environmental Medicine 58, no. 3 (2001): 211–16. http://dx.doi.org/10.1136/oem.58.3.211.

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Hayashi, Chikara. "Ultrafine Particles." Physics Today 40, no. 12 (1987): 44–51. http://dx.doi.org/10.1063/1.881093.

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Liu, Bao Ju, and You Jun Xie. "Study on Strength, Shrinkage and Creep of Concrete Containing Ultrafine Fly Ash Composites." Advanced Materials Research 450-451 (January 2012): 162–67. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.162.

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At steam curing and moist curing conditions, the mechanical properties of concrete with different fineness and different proportions ultrafine fly ash-slag composite were studied. The experimental results indicated that the addition of ultrafine fly ash-slag composite had improved the long term mechanical properties of steam-cured concrete. The concrete with ultrafine fly ash-slag composite has lower drying shrinkage and creep compared to that of control concrete.

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Chagas Cordeiro, Guilherme, Romildo Dias Toledo Filho, and Eduardo de Moraes Rego Fairbairn. "Influência da substituição parcial de cimento por cinza ultrafina da casca de arroz com elevado teor de carbono nas propriedades do concreto." Ambiente Construído 9, no. 4 (2009): 99–107. http://dx.doi.org/10.1590/s1678-86212009000400520.

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Resumo Este trabalho descreve o emprego de cinza ultrafina da casca de arroz com elevado teor de carbono em concretos de resistência convencional e de alta resistência. Estudou-se a influência do emprego da cinza ultrafina (10%, 15% e 20% de substituição de cimento, em massa) nas propriedades reológicas (tensão de escoamento e viscosidade plástica), na resistência à compressão (7, 28, 90 e 180 dias) e na penetração acelerada de íons cloreto. Além disso, a elevação adiabática da temperatura de um concreto convencional com 15% de cinza ultrafina foi comparada com a elevação de um concreto de ref

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Liu, Jie Chao, Zhong Gao Jiao, Xin Hong Liang, Lei Han, and Hui Liu. "Effect of Ultrafine Pulverization on Properties of Apple Pomace Powder." Advanced Materials Research 236-238 (May 2011): 2560–63. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.2560.

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Ultrafine pulverization technology was applied for producing apple pomace powder, and the physical-chemical properties of the ultrafine powder including fluidity, water solubility, water holding capacity, fat binding capacity, and solubility of total phenolics and sugars were investigated. Results suggested that ultrafine pulverization had distinct effect on surface properties of apple pomace powder. With decreasing the size of apple pomace powder, the flow behavior and water solubility were improved, and the dissolubility of total phenolics and sugars increased significantly, while the water

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Xiang, Zhongnan, Zhanjiang Li, Fa Chang, and Pinqiang Dai. "Effect of Heat Treatment on the Microstructure and Properties of Ultrafine WC–Co Cemented Carbide." Metals 9, no. 12 (2019): 1302. http://dx.doi.org/10.3390/met9121302.

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In this paper, the effect of heat treatment on the microstructure and properties of a 0.8 μm WC–10%Co ultrafine cemented carbide was studied. The results show that the microstructural differences in ultrafine WC–Co cemented carbides without and with heat treatment are mainly reflected in the Co phase. For conventional cemented carbides, the hardness and wear resistance can be increased only at the expense of the toughness and strength. An ultrafine-grained WC–Co cemented carbide with good hardness and toughness can be obtained by strengthening the Co phase through an appropriate heat treatment

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Grabowski, Wojciech W., and Hugh Morrison. "Do Ultrafine Cloud Condensation Nuclei Invigorate Deep Convection?" Journal of the Atmospheric Sciences 77, no. 7 (2020): 2567–83. http://dx.doi.org/10.1175/jas-d-20-0012.1.

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AbstractNumerical simulations of the impact of ultrafine cloud condensation nuclei (CCN) on deep convection are analyzed to investigate the idea proposed by Fan et al. that addition of ultrafine CCN to an otherwise pristine environment leads to convective invigoration. The piggybacking methodology is applied, allowing rigorous separation of the impact of aerosols from different flow realizations that typically occur when even a small element of the model physics or modeling setup is changed. The setup follows the case of daytime convective development over land based on observations during the

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Khusainov, Uldash Gamirovich, Kamil Nurulaeyevich Ramazanov, and Roman Sergeevich Esipov. "Influence of Ultrafine-Grained Structure of Martensitic and Austenitic Steels on Diffusion Processes at Low-Temperature Ion Nitriding." Defect and Diffusion Forum 383 (February 2018): 167–72. http://dx.doi.org/10.4028/www.scientific.net/ddf.383.167.

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The paper discusses the influence of ultrafine-grained structure of martensitic and austenitic steels on diffusion processes at low-temperature ion nitriding. The microstructure of ultrafine-grained steels was analysed before and after nitriding. Depth distributions of microhardness are given depending on the class and structure of steels. The study proves that ultrafine-grained structure of steels obtained by high pressure deformation by torsion allows an increased growth rate of the diffusion layer at nitriding.

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Gómez-Zamorano, L. Y., and J. I. Escalante. "Hidratación y microestructura de cemento Portland sustituido parcialmente con sílice ultrafina." Materiales de Construcción 59, no. 296 (2009): 5–16. http://dx.doi.org/10.3989/mc.2009.46108.

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