Статті в журналах: "+519.86"

1

Berikelashvili, G., A. Papukashvili, and J. Peradze. "Iterative solution of a nonlinear static beam equation." Ukrains’kyi Matematychnyi Zhurnal 72, no. 8 (August 18, 2020): 1024–33. http://dx.doi.org/10.37863/umzh.v72i8.833.

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UDC 519.6 The paper deals with a boundary-value problem for the nonlinear integro-differential equation modeling the static state of the Kirchhoff beam. The problem is reduced to a nonlinear integral equation, which is solved using the Picard iteration method. The convergence of the iteration process is established and the error estimate is obtained.

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2

Zhang, Xiao Zhen, Yong Qing Wang, Jing Zhang, Qi Bing Chang, Yu Hua Jiang та Jian Er Zhou. "Investigation of Cobalt-Free Cathode Material Ba_0.5Sr_0.5Fe_0.8Cu_0.2O_3−δ for Micro-Tubular SOFC with Asymmetric Structure Anode". Key Engineering Materials 519 (липень 2012): 36–40. http://dx.doi.org/10.4028/www.scientific.net/kem.519.36.

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A cobalt-free perovskite oxide Ba0.5Sr0.5Fe0.8Cu0.2O3−δ (BSFCu) is applied as the cathode material for intermediate temperature micro-tubular solid oxide fuel cells (SOFCs) with asymmetric structure anode. The NiO-YSZ hollow fiber anode as support was prepared by the phase inversion technique. The as-prepared fiber anode shows a special asymmetric structure consisting of porous sponge-like structure in the middle and finger-like porous structure on the inner and outer side. Dense thin YSZ electrolyte membrane and SDC transition layer were deposited on the NiO-YSZ hollow fiber anode by a vacuum-assisted dip-coating and co-sintering technique. Laboratory-sized micro-tubular single cells of NiO-YSZ/YSZ+SDC/BSFCu-SDC were tested at 650-750°C with humidified H2 as the fuel and static ambient air as the oxidant. The peak power densities of 437.2, 326.5 and 214.4 mWcm-2 can be obtained at 750, 700 and 650°C, respectively. The experimental results indicate that the cobalt-free perovskite oxide BSFCu is a promising cathode material candidate for the developed intermediate temperature micro-tubular SOFC with asymmetric hollow fiber anode.

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3

Liu, Guang Wu, Xing Yuan Ni, Bin Zhou, and Qiu Jie Yu. "Preparation and Characterization of Ultralow Density Silica Aerogels by Acetonitrile Supercritical Drying." Key Engineering Materials 519 (July 2012): 83–86. http://dx.doi.org/10.4028/www.scientific.net/kem.519.83.

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This paper deals with the synthesis of ultralow density silica aerogels using tetramethyl orthosilicate (TMOS) as the precursor via sol-gel process followed by supercritical drying using acetonitrile solvent extraction. Ultralow density silica aerogels with 6 mg/cc of density was made for the molar ratio by this method. The microstructure and morphology of the ultralow density silica aerogels was characterized by the specific surface area, SBET, SEM, and the pore size distribution techniques. The results show that the ultralow density silica aerogel has the high specific surface area of 812m2/g. Thermal conductivities at desired temperatures were analyzed by the transient plane heat source method. Thermal conductivity coefficients of silica aerogel monoliths changed from 0.024 to 0.043W/ (m K) as temperature increased to 400°C, revealed an excellent heat insulation effect during thermal process.

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4

Huang, Xia Ni, Zhang Han Wu, Ke Cao, Wen Zeng, Chun Ju Lv, and Yue Xiang Huang. "Hydrogen Generation by Hydrolysis of the Ball Milled Al-C-KCl Composite Powder in Distilled Water." Key Engineering Materials 519 (July 2012): 87–91. http://dx.doi.org/10.4028/www.scientific.net/kem.519.87.

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In the present investigation, the Al-C-KCl composite powders were prepared by a ball milling processing in an attempt to improve the hydrogen evolution capacity of aluminum in water. The results showed that the hydrogen generation reaction is affected by KCl amount, preparation processing, initial aluminum particle size and reaction temperature. Increasing KCl amount led to an increased hydrogen generation volume. The use of aluminum powder with a fine particle size could promote the aluminum hydrolysis reaction and get an increased hydrogen generation rate. The reaction temperature played an important role in hydrogen generation rate and the maximum hydrogen generation rate of 44.8 cm3 min-1g-1of Al was obtained at 75oC. The XRD results identified that the hydrolysis byproducts are bayerite (Al(OH)3) and boehmite (AlOOH).

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5

Sang, Ge, Ming Jing Tu, Sheng Wu, Xiao Guo Fu, Qua Nan Li, Yong Gui Chen, Guang Hui Zhang, and Xiao Qiu Ye. "XPS Study of Poisoning Mechanism of O₂ on LaNi_4.7Al_0.3 Oxygen." Key Engineering Materials 519 (July 2012): 96–99. http://dx.doi.org/10.4028/www.scientific.net/kem.519.96.

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In this paper, LaNi4.7Al0.3 alloy samples were obtained via melting in middle frequency influence fire .In addition, The alloy pellets were milled for absorbing and desorbing Hydrogen ability study, The P-V-T measurement provided us with poisonous effect on the oxidation of LaNi4.7Al0.3.To understand the poisoning mechanism of O2 on LaNi4.7Al0.3, the X-ray photoelectron spectroscopy (XPS) was introduced to analyzed the process of poisoning of LaNi4.7Al0.3 alloy, Which revealed the changes of the valence of the elements of the alloy LaNi4.7Al0.3 poisoned by O2.

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6

Li, Wei, Xing Xiang Zhang, and Xue Chen Wang. "Microencapsulated Phase Change Materials and its Application in Thermal-Regulated Fibers." Key Engineering Materials 519 (July 2012): 6–9. http://dx.doi.org/10.4028/www.scientific.net/kem.519.6.

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The phase change materials (PCMs) can absorb, store or release large latent heat over a defined temperature range while the materials change phase or state, so they can be potentially used in thermal energy storage. In this paper, a series of microencapsulated phase change materials (MicroPCMs) with n-octadecane and n-dodecanol as core were successfully fabricated respectively, where the styrene-based copolymer, acrylic based copolymer, melamine-formaldehyde resin and polyurea were selected as shell materials. The morphology of these MicroPCMs was observed by scanning electron microscopy (SEM), and the core-shell structure and the shell thickness of microcapsules were also characterized by SEM. In addition, the phase change properties of MicroPCMs were investigated using differential scanning calorimetry (DSC) analysis. Furthermore, thermal-regulated calcium alginate fiber was produced by adding MicroPCMs in wet-spinning process; and the effects of various types of MicroPCMs on fiber was discussed.

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7

Zakusylo, O. K., та I. K. Matsak. "Оцінки швидкості збіжності в граничній теоремі для екстремальних значень регенеруючих процесів". Ukrains’kyi Matematychnyi Zhurnal 72, № 8 (18 серпня 2020): 1064–81. http://dx.doi.org/10.37863/umzh.v72i8.1028.

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УДК 519.21 Встановлено швидкість збіжності до експоненціального розподілу в загальній граничній теоремі для екстремумів регенеруючих процесів. Наведено приклади застосувань отриманого результату до процесів народження та загибелі і процесів, які задають довжину черги.

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8

Bogachev, V. I. "On Skorokhod differentiable measures." Ukrains’kyi Matematychnyi Zhurnal 72, no. 9 (September 22, 2020): 1159–78. http://dx.doi.org/10.37863/umzh.v72i9.6277.

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9

Litovchenko, V. A. "Флуктуації Хольцмарка нестаціонарних гравітаційних полів". Ukrains’kyi Matematychnyi Zhurnal 73, № 1 (22 січня 2021): 69–76. http://dx.doi.org/10.37863/umzh.v73i1.6113.

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УДК 517.937, 519.21 Побудовано розподіли Хольцмарка нестаціонарних флуктуацій локальної взаємодії рухомих об'єктів системи із гравітаційним впливом, що підпорядкований степеневому закону. Знайдено псевдодиференціальне рівняння з оператором Рісса дробового диференціювання, яке відповідає цьому процесу.З'ясовано загальну природу симетричних стійких випадкових процесів Леві.

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10

Chen, X. "Condition for intersection occupation measure to be absolutely continuous." Ukrains’kyi Matematychnyi Zhurnal 72, no. 9 (September 22, 2020): 1304–12. http://dx.doi.org/10.37863/umzh.v72i9.6278.

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UDC 519.21 Given the i.i.d. -valued stochastic processes with the stationary increments, a minimal condition is provided for the occupation measure to be absolutely continuous with respect to the Lebesgue measure on An isometry identity related to the resulting density (known as intersection local time) is also established.

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11

Bratiichuk, M. S., A. A. Chechelnitsky та I. Ya Usar. "Система M/M/1 з повторними вимогами та змінною інтенсивністю обслуговування". Ukrains’kyi Matematychnyi Zhurnal 72, № 3 (28 березня 2020): 355–65. http://dx.doi.org/10.37863/umzh.v72i3.813.

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УДК 519.21<br> Розглядається система обслуговування типу M/M/1 з повторними вимогами, в якiй iнтенсивностi обслуговуваннязалежать вiд завантаження системи, тобто вiд кiлькостi вимог, якi знаходяться в черзi на обслуговування. Знайдено умови iснування та формули для ергодичного розподiлу кiлькостi вимог у системi у випадку скiнченної танескiнченної черги повторних вимог.

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12

Mangin, Loïc. "Une vie entre mica et calcite." Pour la Science N° 519 - janvier, no. 1 (June 1, 2021): 86–87. http://dx.doi.org/10.3917/pls.519.0086.

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13

Riabov, G. V. "On a Brownian motion conditioned to stay in an open set." Ukrains’kyi Matematychnyi Zhurnal 72, no. 9 (September 22, 2020): 1286–303. http://dx.doi.org/10.37863/umzh.v72i9.6281.

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UDC 519.21 Distribution of a Brownian motion conditioned to start from the boundary of an open set and to stay in for a finite period of time is studied. Characterizations of such distributions in terms of certain singular stochastic differential equations are obtained. Results are applied to the study of boundaries of clusters in some coalescing stochastic flows on

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14

Singh, A. K., and M. K. Singh. "Study of frozen Newton-like method in a banach space with dynamics." Ukrains’kyi Matematychnyi Zhurnal 74, no. 2 (February 21, 2022): 233–52. http://dx.doi.org/10.37863/umzh.v74i2.6764.

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UDC 519.6 The main objective of this work is investigation of positives and negatives of the three steps iterative frozen-type Newtonlike method for solving nonlinear equations in a Banach space. We perform a local convergence analysis by Taylor’s expansion and semilocal convergence by recurrence relations technique under the conditions of Kantorovich theorem for the Newton’s method. The convergence results are examined by comparing the proposed method with the Newton’s method and the fourth order Jarratt’s method using some test functions. We discuss the corresponding conjugacy maps for quadratic polynomials along with the extraneous fixed points. Additionally, the theoretical and numerical results are examined byusing the dynamical analysis of a selected test function. It not only confirms the theoretical and numerical results, but also reveals some drawbacks of the frozen Newton-like method.

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15

Krylov, N. V. "On time inhomogeneous stochastic Itô equations with drift in." Ukrains’kyi Matematychnyi Zhurnal 72, no. 9 (September 22, 2020): 1232–53. http://dx.doi.org/10.37863/umzh.v72i9.6280.

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UDC 519.21 We prove the solvability of Itô stochastic equations with uniformly nondegenerate bounded measurable diffusion and drift in Actually, the powers of summability of the drift in and could be different. Our results seem to be new even if the diffusion is constant. The method of proving the solvability belongs to A. V. Skorokhod.Weak uniqueness of solutions is an open problem even if the diffusion is constant.

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16

Dwi Cahyadi Jaya, I. Made, I. Gede Dyana Arjana, and A. A. Gede Maharta Pemayun. "STUDI KOORDINASI KERJA RELE DIFERENSIAL DAN RELE RESTRICTED EARTH FAULT SETELAH UPRATING PADA TRANSFORMATOR II DI GI KAPAL." Jurnal SPEKTRUM 5, no. 1 (June 25, 2018): 49. http://dx.doi.org/10.24843/spektrum.2018.v05.i01.p07.

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The differential relay on the power transformer II in the Kapal Substation has a sensitivity setting of 30% to the nominal current of winding. Fault current that occurs below setting is not detected because the fault current has not reached the set limit. To overcome the fault current it is equipped with REF relay that has sensitivity below 30%. The analysis was performed by calculation method according to the relay setting manual. The results of sensitivity setting of REF relay is 382.75 A or fault point at 22.09% of the transformer winding, while the differential relay is 519.6 A or fault point at 30% of the transformer winding. The calculation result shows that the first to work is the REF relay than the differential relay. So the fault on the transformer winding is overcome by the REF relay.

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17

A. K. SHAHI and SUSHMA KOUL. "Crop adaptation and modeling for prediction of essential oil production and quality of a geraniol rich strain of Cymbopogon commutatus (Steud.) Stapf [RL(J) CC1] using energy indices." Journal of Agrometeorology 12, no. 1 (June 1, 2010): 22–26. http://dx.doi.org/10.54386/jam.v12i1.1261.

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Occurrence of gerniol and geranyl acetate as major chemical constituents were reported in the essential oil of Cymbopogon commutauts (Steud.) Stapf. A selectant having H”80% total geraniol and coded as RRL (J) CC1 has been studied by way of quantifying growth response coefficient values of morpho-economic character, which was 1.0 signifying its good adaptability under subtropical environment. Leaf adaptation has been quantified as phyllochron which exhibited 519.6 and 775.6 degree-days for production of single mature leaf during first and second harvests, respectively. Floral adaptation was quantified as photoperiod response coefficient b=412 (degreedays/ day-length). Based on two years pooled observation (2001-2002), regional crop models have been developed for prediction of essential oil production and its quality as total geraniol content (%) by using most-efficient energy indices viz., phenothermal index and thermo/photo ratio.

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18

Starkova, A. V., Yu N. Karpenko, B. Ya Syropyatov, F. V. Sobin, and N. A. Pulina. "STUDY OF INFLUENCE OF BLOOD THIAZOLINE AMMONIUM 4-CHLOROPHENYL-2-HYDROXY-4-OXO-2-BUTENOATE CONCENTRATION ON ANTICOAGULANT EFFECT UPON SUBCUTANEOUS ADMINISTRATION." Perm Medical Journal 35, no. 1 (February 15, 2018): 88–94. http://dx.doi.org/10.17816/pmj35188-94.

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Aim. To study the effect of blood thiazoline ammonium 4-chlorophenyl-2-hydroxy-4-oxo-2-butenoate content on the manifestation of anticoagulant effect upon subcutaneous administration to rabbits. Materials and methods. The studies were fulfilled on outbred rabbits. The substance was administered subcutaneously in the dose of 35 mg/kg. The time of blood coagulation was determined using coagulometer “Minilab 701”, and blood concentration - by means of liquid micro-column chromatograph “Milichrom A-02”. Results. The obtained results prove that maximum concentration of the compound in blood and maximum anticoagulant effect is reached in 30 minutes after subcutaneous administration. The substance anticoagulant effect lasted for 120 minutes after its administration. At present, the compound concentration in blood is equal to 519.8 ± 145.41 ng/ml. Conclusions. The studied compound, when administered subcutaneously, is quickly absorbed and begins to render an anticoagulant effect. Efficacy of action of this compound depends on its blood concentration.

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19

Zulkurnai, N. Z., U. F. Md. Ali, N. Ibrahim, and N. S. Abdul Manan. "Carbon Dioxide Capture by Deep Eutectic Solvent Impregnated Sea Mango Activated Carbon." E3S Web of Conferences 34 (2018): 02030. http://dx.doi.org/10.1051/e3sconf/20183402030.

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The increment amount of the CO2 emission by years has become a major concern worldwide due to the global warming issue. However, the influence modification of activated carbon (AC) has given a huge revolution in CO2 adsorption capture compare to the unmodified AC. In the present study, the Deep Eutectic Solvent (DES) modified surface AC was used for Carbon Dioxide (CO2) capture in the fixed-bed column. The AC underwent pre-carbonization and carbonization processes at 519.8 °C, respectively, with flowing of CO2 gas and then followed by impregnation with 53.75% phosphoric acid (H3PO4) at 1:2 precursor-to-activant ratios. The prepared AC known as sea mango activated carbon (SMAC) was impregnated with DES at 1:2 solid-to-liquid ratio. The DES is composing of choline chloride and urea with ratio 1:2 choline chloride to urea. The optimum adsorption capacity of SMAC was 33.46 mgco2/gsol and 39.40 mgco2/gsol for DES modified AC (DESAC).

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20

Dorogovtsev, A. A., and M. B. Vovchanskii. "On approximations of the point measures associated with the Brownian web by means of the fractional step method and the discretization of the initial interval." Ukrains’kyi Matematychnyi Zhurnal 72, no. 9 (September 22, 2020): 1179–94. http://dx.doi.org/10.37863/umzh.v72i9.6279.

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UDC 519.21 We establish the rate of weak convergence in the fractional step method for the Arratia flow in terms of the Wasserstein distance between the images of the Lebesque measure under the action of the flow. We introduce finite-dimensional densities that describe sequences of collisions in the Arratia flow and derive an explicit expression for them. With the initial interval discretized, we also discuss the convergence of the corresponding approximations of the point measure associated with the Arratia flow in terms of such densities.

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21

Vasylyk, V. B., I. P. Gavrilyuk та V. L. Makarov. "Експоненціально збіжний метод наближення для рівняння з дробовою похідною і необмеженим операторним коефіцієнтом в банаховому просторі". Ukrains’kyi Matematychnyi Zhurnal 74, № 2 (21 лютого 2022): 151–63. http://dx.doi.org/10.37863/umzh.v74i2.6984.

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УДК 519.62, 519.63Запропоновано та проаналiзовано експоненцiально збiжний наближений метод розв’язування диференцiального рiвняння з правосторонньою дробовою похiдною Рiмана – Лiувiлля i необмеженим операторним коефiцiєнтом у банаховому просторi. Застосовано зображення розв’язку за допомогою iнтеграла Данфорда – Кошi по гiперболi, що охоплює спектр операторного коефiцiєнта, з подальшим застосуванням експоненцiально збiжної квадратурної формули. Для цього вибрано параметри гiперболи таким чином, щоб пiдiнтегральна функцiя мала аналiтичне продовження в смугу навколо дiйсної осi, а потiм застосовано Sinc-квадратуру. Показано експоненцiальну точнiсть методу i наведено числовi розрахунки тестового прикладу, що пiдтверджують апрiорну оцiнку.

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22

Muller, Mathieu, Fanja Rabenoelina, Patrick Balaguer, Dominique Patureau, Karin Lemenach, Hélène Budzinski, Damia Barceló, et al. "CHEMICAL AND BIOLOGICAL ANALYSIS OF ENDOCRINE-DISRUPTING HORMONES AND ESTROGENIC ACTIVITY IN AN ADVANCED SEWAGE TREATMENT PLANT." Environmental Toxicology and Chemistry 27, no. 8 (2008): 1649. http://dx.doi.org/10.1897/07-519.1.

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23

Raucci, Gaetana, Camila Pachêco-Pereira, Maryam Elyasi, Fabrizia d’Apuzzo, Carlos Flores-Mir, and Letizia Perillo. "Short- and long-term evaluation of mandibular dental arch dimensional changes in patients treated with a lip bumper during mixed dentition followed by fixed appliances." Angle Orthodontist 86, no. 5 (January 15, 2016): 753–60. http://dx.doi.org/10.2319/073015-519.1.

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ABSTRACT Objective: To evaluate short- and long-term mandibular dental arch changes in patients treated with a lip bumper during the mixed dentition followed by fixed appliances, compared with a matched control sample. Materials and Methods: Dental casts and lateral cephalograms obtained from 31 consecutively treated patients before (T0) and after (T1) lip bumper, after fixed appliances (T2), and a minimum of 3 years after fixed appliances (T3) were analyzed. The control group was matched as closely as possible. Arch width, arch perimeter, arch length, and incisor proclination were evaluated. Repeated measures ANOVA was used to analyze changes in measurements over all four time points between treatment and control groups. Results: Arch widths and crowding were always significantly different except at T2−T1. At T1−T0, only crowding decreased 3.2 mm while intercanine, interpremolar, and intermolar widths increased by 3.8, 3.3, and 3.9 mm, respectively. Changes at T3−T2 showed a significant decrease of 2.1 mm for crowding and an increase of 3.5, 2.9, 2.7, and 0.8 mm for intercanine, interpremolar, and intermolar widths and arch perimeter, respectively. Finally, at T3−T0, the reduction in crowding of 5.03 mm was significant and clinically important in the treated group. The differences between intercanine, interpremolar, and intermolar widths were also significant (2.1, 3.8, and 3.6 mm, respectively). All those differences favored the treated group. Conclusions: Mandibular dental arch dimensions were significantly changed after lip bumper treatment. At follow-up, all arch widths were slightly decreased, generating an increase of 0.4 mm in crowding, considered clinically irrelevant. Overall changes remained stable after an average 6.3-year follow-up.

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24

Premaraj, Sundaralingam, Isabela Souza та Thyagaseely Premaraj. "Mechanical loading activates β-catenin signaling in periodontal ligament cells". Angle Orthodontist 81, № 4 (липень 2011): 592–99. http://dx.doi.org/10.2319/090310-519.1.

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25

Eberl, E., T. Wagner, J. Jacoby, A. Tauschwitz, and D. H. H. Hoffmann. "Soft X-ray lasing at 519.7 Å in a Recombining Z-pinch Plasma." Laser and Particle Beams 15, no. 4 (December 1997): 589–95. http://dx.doi.org/10.1017/s0263034600011162.

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This paper is reviewing the amplification of XUV radiation at 519.7 and 498.5 Å with a gain-length product of 2.5 and 2.2 for the 4f-3d and 4d-3p transition in an oxygen Z-pinch plasma. Time resolved measurements of the O VI (519.7 Å) transition were performed and the dependence of the line intensity on the discharge current and initial gas pressure is reported.

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26

Iksanov, A., та B. Rashytov. "Функціональна гранична теорема без центрування для загальних процесів дробового ефекту". Ukrains’kyi Matematychnyi Zhurnal 73, № 2 (22 лютого 2021): 160–78. http://dx.doi.org/10.37863/umzh.v73i2.6210.

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Анотація:

УДК 519.27 Загальним процесом дробового ефекту ми називаємо згортку детермінованої функції, що належить простору Скорохода, та локально скінченного лічильного процесу, заданого на невід'ємній півосі.В цій статті запропоновано достатні умови, за яких належним чином нормалізований (без центрування) загальний процес дробового ефекту слабко збігається у просторі Скорохода. Наведено кілька прикладів конкретних лічильних процесів, що задовольняють ці достатні умови, разом із відповідними граничними теоремами. Продовжено дослідження, розпочаті в статті О. Іксанова та Б. Рашитова (2020 р.), де було доведено функціональну граничну теорему з центруванням із (гауссівськими) процесами типу Рімана–Ліувілля в якості граничних процесів.

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27

Kamimura, H. "Conversion of zearalenone to zearalenone glycoside by Rhizopus sp." Applied and Environmental Microbiology 52, no. 3 (1986): 515–19. http://dx.doi.org/10.1128/aem.52.3.515-519.1986.

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28

Ding, K., G. P. Zheng, and Y. Shen. "Ferroelectric-to-Ferroelectric Phase Transition Induced Electro-Caloric Energy Conversion in Barium Titanate at Room Temperature." Key Engineering Materials 519 (July 2012): 10–13. http://dx.doi.org/10.4028/www.scientific.net/kem.519.10.

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Анотація:

The electro-caloric energy conversions in single-crystal and polycrystalline barium titanate samples are investigated using differential scanning calorimetry (DSC). The DSC measurement reveals a refrigeration effect of 0.1 J/g under an electric field of 15 kV/cm at T=17.5 °C, which is related with the ferroelectric-to-ferroelectric transition in barium titanate. The thermodynamics calculation based on Maxwell’s relations leads to similar conclusion. Such EC effect shows relaxation with the heat release process more significant than the heat adsorption process when the applied field is changed, which is different with those occur near the ferroelectric-to-paraelectric transition temperatures. Furthermore, the electro-caloric energy conversion relation or the scaling relation between the maximum refrigeration effect ΔH and the applied field E, is found to follow a power law ΔHmax~Eb with b=1.72, which is significantly larger than those for EC effects related with the ferroelectric-to-paraelectric transitions.

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29

Bai, Lian, Ming Li, and Ce Wen Nan. "Preparation and Characterization of Polymer Electrolyte Based on Comb-Shaped Poly(oxyethylene) with Ether Side Chains." Key Engineering Materials 519 (July 2012): 14–19. http://dx.doi.org/10.4028/www.scientific.net/kem.519.14.

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A kind of comb-shaped poly(oxyethylene) with nine oxyethylene units in ether side chains has been synthesized via chemical modification on ethylene oxide-epichlorohydrin copolymer [P(EO/EH)s] with a kind of alcohol ether carboxylate. The prepared polyether was characterized by FTIR spectroscopy. A series of polymer electrolytes were prepared by dissolving LiN(SO2CF3)2 at different ratios in the polymer matrix. It is found that the ionic conductivity of the comb-shaped poly(oxyethylene) based polymer electrolytes could reach 4.3×10-5 S/cm at 30°C and 6.2×10-4 S/cm at 80°C, which increase by an order of magnitude compared with that of poly(ethylene oxide) (PEO) based ones at corresponding temperatures. Both the amorphous feature of the polymer electrolytes above the ambient temperature and the highly mobile ether side chains of the comb-shaped polyether contribute to the increase of ionic conductivity.

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30

Li, Shi You, Yang Yu Zhao, Wei Zhao, and Xiao Ling Cui. "Effect of Lithium Bis(oxalate)Borate-Based Electrolyte on the Performance of LiNi_0.5Mn_1.5O₄ for High Voltage Lithium-Ion Batteries." Key Engineering Materials 519 (July 2012): 156–59. http://dx.doi.org/10.4028/www.scientific.net/kem.519.156.

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LiNi0.5Mn1.5O4 is a promising 5 V class anode material for high power applications, however, before applying in lithium-ion batteries, it is necessary to find more appropriate electrolyte systems to exert the perfect electrochemical performance of LiNi0.5Mn1.5O4. In this paper, the electrochemical performances of LiBOB-propylene carbonate (PC)/dimethyl carbonate (DMC) electrolyte are investigated. It shows high oxidation potentials (>5.5 V) and satisfactory conductivities, When used in LiNi0.5Mn1.5O4/Li cells, compared to the cell with the electrolyte system of LiPF6-ethylene carbonate (EC)/dimethyl carbonate (DMC) electrolyte, LiBOB-PC/DMC electrolyte exhibit several advantages, such as more stable cycle performance, higher discharge voltage plateau (>4.64 V), higher coulomb efficiency, and higher mean voltage (4.55 V).

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31

Wang, Fang, Da Liang Xu, Chun Sheng Liang, Hong Yuan Sun, and Zhong Kuan Luo. "Performance Optimization for Lithium–Oxygen Batteries." Key Engineering Materials 519 (July 2012): 160–63. http://dx.doi.org/10.4028/www.scientific.net/kem.519.160.

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Анотація:

Lithium–oxygen coin cells without catalyst were assembled in argon atmosphere and tested in pure oxygen. Results showed that the first discharge performance of the batteries was strongly affected by the carbon loading, electrolyte amount and current density. At the carbon loading (0.4 mg/cm2), the electrolyte amount (160 μL/cell) and the current density (0.05 mA/cm2), a high capacity of 4586.5 mAh/g was obtained. The capacity decreased when the carbon loading or current density was increased. And the capacity would have a decrease when the amount of electrolyte was decreased. The highest capacity of 6010.2 mAh/g was obtained by optimizing the combination of carbon loading and electrolyte amount at current density of 0.01mA/cm2. However, the discharge capacity sharply decreased from the second cycle. It may be partly due to the fact that the pores of cathode surface were blocked by discharge products at the end of discharge.

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32

Gao, Fang. "Performance Study on Zirconia Cloth Separator for High Pressure Ni-H₂ Battery." Key Engineering Materials 519 (July 2012): 164–68. http://dx.doi.org/10.4028/www.scientific.net/kem.519.164.

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Анотація:

High pressure NiH2 battery is a kind of secondary power consists of a nickel electrode and the hydrogen electrode with the quality of high stability, long service life, overcharge and overdischarge resisting advantages, the United States, Russia and France have launched high pressure NiH2 batteries and has been widely used in satellite, space stations and other areas. Performance of strength, Ability of Antioxidation, Chemical Durability, Dimensional Stability and akali retaition ability were strictly required by NiH2 battery’s seporatosr, zirconia cloth seporator can satisfy the use requirement in many aspects. Physical and chemical properties of areo density, average thickness, alkaline retention ability, alkaline absorbing ratio and battery performance were tested in this paper.

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33

Chen, Zhuo, and Jiong Yang. "Theoretical Study of the Filling Fraction Limit of Fe-Substituted Ba-Filled Skutterudite Ba_yFe_4xCo_4-4xSb₁₂." Key Engineering Materials 519 (July 2012): 169–73. http://dx.doi.org/10.4028/www.scientific.net/kem.519.169.

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Анотація:

Theoretical study of the filling fraction limit (FFL) of the Fe-substituted Ba-filled skutterudite was carried out via first principle method calculations. The lattice constant of BayFe4xCo4-4xSb12 increases with the Ba filling fraction under fixed Fe content while it does not simply increases with Fe content under fixed Ba filling fraction. The FFL is determined by the competition between the formation of filled skutterudite phases and the corresponding secondary phases. The FFL of Ba in the Fe-substituted CoSb3 skutterudites increases monotonically from 37.5% with Fe content of 0 to 100% with Fe content of ~50%. The most stable composition of the BayFe4xCo4-4xSb12is expected to be BayFe2.8Co1.2Sb12.

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34

Ding, Xuan, Qing Ming Chen, Ji Ma, Mya Theingi, Ying Juan Li, and Hui Zhang. "Laser Induced Thermoelectric Voltage Effect of LaNiO₃/LaAlO₃ Multilayer." Key Engineering Materials 519 (July 2012): 184–87. http://dx.doi.org/10.4028/www.scientific.net/kem.519.184.

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Анотація:

LaNiO3 single layer, LaNiO3/LaAlO3 superlattice on vicinal-cut single crystalline LaAlO3 (100) and LSAT (100) substrates were prepared by pulsed laser deposition technique. Single-phased LaNiO3 polycrystal target, which is synthesized by sol-gel method, is employed in the thin film deposition process. The structure and physical properties of both the targets and thin films are analyzed. X-ray diffraction results show LaNiO3 single layer is of c-orientation and textural growth, therefore LaNiO3/LaAlO3 forms not superlattice but multilayer. The ultra-violet LITV (laser induced thermoelectric voltage) effects of the LaNiO3/LaAlO3 mutilayer and LaNiO3 single layer were investigated. A comparison study of the influence of LaNiO3 targets prepared by different sol-gel method on the physical property, and LITV effect of thin films was performed as well.

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35

Ying, P. Z., H. Zhou, Y. L. Gao, Y. Y. Li, Y. P. Li, X. L. Lian, and J. L. Cui. "Thermoelectric Properties of a Wide–Gap Chalcopyrite Compound AgInSe₂." Key Engineering Materials 519 (July 2012): 188–92. http://dx.doi.org/10.4028/www.scientific.net/kem.519.188.

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Анотація:

Here we report the thermoelectric properties of a wide–gap chalcopyrite compound AgInSe2, and observed the remarkable improvement in electrical conductivity σ, due to the bandgap (Eg = 1.12 eV) reduction compared to In2Se3. The improvement in σ is directly responsible for the enhancement of thermoelectric figure of merit ZT, though the thermal conductivity is much higher at 500 ~ 724 K. The maximum ZT value is 0.34 at 724 K, increasing by a factor of 4, indicating that this chalcopyrite compound is of a potential thermoelectric candidate if further optimizations of chemical compositions and structure are made.

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36

Liu, Hai Hui, Wei Wei Peng, Yong Tan, Li Chen Hou, and Xing Xiang Zhang. "Preparation and Properties of Polyamide 6-Functionalized Nanometer-Sized Graphene Composite Fiber." Key Engineering Materials 519 (July 2012): 20–23. http://dx.doi.org/10.4028/www.scientific.net/kem.519.20.

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Анотація:

A novel approach to the functionalization of nanometer-sized graphene was presented in this work. Covalent bonding between the filler and matrix was formed, with minimal disruption to the sp2 hybridization of the pristine graphene sheet. Functionalization proceeded by covalently bonding a 4-substituted benzoic acid monomer to the surface of expanded graphene, via ‘‘direct Friedel-Crafts” acylation in mild reaction medium of polyphosphoric acid (PPA)/phosphorous pentoxide. Polyamide 6 (PA6)-functionalized graphene (FG) composites were prepared by in situ polymerization of ε-caprolactam in the presence of nanometer-sized FG. Nanocomposite fiber with 0.1 wt.% content of nanometer-sized FG was prepared with a piston spinning machine and hot-roller drawing machine. The nanometer-sized FG performed homogeneous dispersion in the polymer matrix. The mechanical properties of the PA6-FG composites fiber was enhanced by adding FG in the polymer matrix. The new functionalization method paves the way to prepare graphene-based nanocomposites fiber simply, without disrupting the primary structures of nanometer-sized graphene.

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37

Mi, Hong Wei, Jian Hong Liu, Hong Yuan Sun, Shuang Quan Wu, Han Ping Zhou, Hui Qun Cao, and Jing Zhong Chen. "Preparation of Graphene-Like Carbon Materials as Electrodes of Electric Double Layer Capacitors." Key Engineering Materials 519 (July 2012): 206–10. http://dx.doi.org/10.4028/www.scientific.net/kem.519.206.

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Анотація:

Graphene-like carbon materials (GCMs) are prepared by the carbonization of liquid acrylonitrile oligomer (LANO) at 600-1400 °C for 4 h in an Ar atmosphere. LANO undergoes thermal oxidative dehydrogenation and preliminary cyclization by pre-process in air at low temperature (120 °C) and high temperature (220 °C) before the carbonization. Surface chemistry，crystalline and pore structures of the GCMs are characterized by scanning electron microscope (SEM), power X-ray diffraction (XRD) and N2 adsorption respectively. Comparison of the effect of various carbonization temperatures on the electrochemical performance of the electric double layer capacitors (EDLCs) is specifically investigated. The GCMs carbonized at 1300 °C for 4 h shows a fairly good electrochemical performance. The BET surface area of GCM1300 is 81.58 m2/g and the specific capacitance of the GCM1300 is 22.52 F/g in 1 mol/ L Et4NBF4/PC electrolytes.

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38

Chen, Fei, Na Li, Qiang Shen, Chuan Bin Wang, and Lian Meng Zhang. "Effect of Annealing Treatment on Electrical and Optical Properties of ATO Thin Films by Pulsed Laser Deposition." Key Engineering Materials 519 (July 2012): 236–39. http://dx.doi.org/10.4028/www.scientific.net/kem.519.236.

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Анотація:

Transparent conducting antimony doped tin oxide (ATO) films have been prepared on quartz glass substrate by pulsed laser deposition (PLD) method which is distinctive to maintain the elemental components between the targets and the obtained thin ﬁlms under optimal conditions. The effect of annealing temperature on the electrical and optical properties of the ATO thin films has been discussed. The annealing treatments have been often employed to reduce the defects and enlarge the grain size for more desirable crystalline structure. As the annealing temperature increases, the ATO thin films exhibited a slightly enhanced crystallinity. Furthermore, annealing treatment can promote both conductivity and transmittance significantly, especially for conductivity. The X-ray photoelectron spectroscopy is used to explore the variation of Sb5+/Sb3+ ratio against the annealing temperature. The optimal resistivity is 2.7×10-3 Ω cm and the average transmittance is about 92% at annealing temperature of 550 oC.

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39

Gong, Xiao Yang, Zhi Feng Gu, and Tong Wei Li. "‘Window’ Effect in the Analysis of Universal Dynamic Response." Key Engineering Materials 519 (July 2012): 24–27. http://dx.doi.org/10.4028/www.scientific.net/kem.519.24.

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Анотація:

Studies of ion motion in crystalline and glassy materials, Jonscher power law, which was frequently referred to as the so-called universal dynamic response (UDR) is an effective method, but the power law exponents obtained from curve-fitting are sensitively affected by the frequency window employed in the analysis. So how to choose frequency window and which window can truly describe the nature of the materials, are important for every researcher. In this paper, through analyzing the experimental data of frequency dependence of ac conductivity in 50Li2O–50P2O5 glasses, a simple method to choose frequency window was found and further discussions indicated our choice was reasonable.

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40

Ye, Yin Zhu, Zheng Bo Wang, Xiao Hu Bai, and Jin Xing Wang. "Nano-Materials Create a Whole New World to Oil Industry." Key Engineering Materials 519 (July 2012): 256–60. http://dx.doi.org/10.4028/www.scientific.net/kem.519.256.

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Анотація:

Nowadays, nano-material has been greatly developed and successfully applied in many areas, such as information, medicine, energy and consumer goods. Meanwhile, as an important fossil energy, crude oil and its derivatives have been widely used in various aspects of our daily lives. However, along with the increasing difficulties of oil development and the decreasing amount of remaining oil reserve, how to get oil more efficiently and economically has become big challenge to oil industry. Because of its small size and unique multi-function, nano-materials provide many creative solutions to oil industry. For this, what are nano-materials and their key properties are reviewed firstly. Then the current research and applications of nano-materials in oil exploration and production are introduced respectively. Finally, the future trends and potentials of nano-material in oil industry are put forward prospectively.

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41

Guo, Jie, Wei Guo Ren, Yang Jiang, and Zhi Gang Lu. "Research Progress on Technology of Adsorption and Store Gasoline by Reticular Polyurethane Foam." Key Engineering Materials 519 (July 2012): 261–64. http://dx.doi.org/10.4028/www.scientific.net/kem.519.261.

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Анотація:

With powerful security and reliability of storage, the SFAM that is visibly different from the technology of storage fuel oil by the empty container adsorbs storage fuel oil by the adsorption material. Using reticular polyurethane foam to adsorb gasoline, is the application of the SFAM technology. In order to promote the development of the SFAM technology, the article analyzes the research status of the basic theory and the related theory at home and abroad of the fuel oil adsorption storage.

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42

Ai, Yun Long, Fei He, Bing Liang Liang, Wen He, and Wei Hua Chen. "Mechanical Properties of La₂O₃-Al₂O₃ Ceramics Prepared by Microwave Sintering." Key Engineering Materials 519 (July 2012): 265–68. http://dx.doi.org/10.4028/www.scientific.net/kem.519.265.

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Анотація:

The influence of La2O3 on the phase and microstructure evaluation and mechanical properties of La2O3-Al2O3 ceramics sintered with 2.45 GHz microwave energy was investigated. The results showed that La2O3 could densify the pure alumina with a lower sintering temperature and a short sintering time. La2O3 reacted with Al2O3 to form LaAl11O18 completely and the amount of LaAl11O18 increased with the increasing content of La2O3, distributing at the Al2O3 grain boundaries. The specimen doped with 10 vol.% and 15 vol.% La2O3 sintered at 1500 °C exhibited plenty of columnar grains with draw ratio about 1:4. The existence of columnar grains enhanced the microhardness and fracture toughness of La2O3-Al2O3 ceramics.

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43

Hu, Chen, Long Quan Shao, Lin Lin Wang, Shan Yu Zhou, and Jun Ai. "Flexure Strength and Elastic Modulus of Four Types of Dental Fiber Posts." Key Engineering Materials 519 (July 2012): 269–72. http://dx.doi.org/10.4028/www.scientific.net/kem.519.269.

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Анотація:

Objective. To investigate the flexure strengths and elastic modulus of four types of dental fiber posts. Methods. The flexure strengths of ParaPost Taper Lux, Tenax Fiber White, Luxa Post and Rebilda Post fiber post were measured. The rupture modes were analyzed with SEM. Results. There was no significant difference between ParaPost Taper Lux (591.47±35.15MPa) and Rebilda Post (614.67±58.36MPa) in flexure strength (P>0.05), and Tenax Fiber White (846.62±71.15MPa) had significantly higher flexure strength than the other groups. There was no significant difference between Tenax Fiber White (23.93±2.14GPa) and Luxa Post (22.67±1.39GPa) in elastic modulus (P>0.05), and Tenax Fiber White and Luxa Post had significantly lower elastic modulus than other groups. It could be observed by transverse SEM that the combine of fiber and resin was even and compact and plenty of resin fragment adhered to the surface of fiber in Tenax Fiber White group, multitudinous cracks were observed by lengthwise SEM. Conclusion. The flexural properties and rupture modes of four kinds of dental fiber posts were significantly different.

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44

Yao, Yong Li, Yan Gai Liu, Zhao Hui Huang, and Ming Hao Fang. "Study on Multi-Doped Ceria-Based Solid Electrolytes." Key Engineering Materials 519 (July 2012): 28–31. http://dx.doi.org/10.4028/www.scientific.net/kem.519.28.

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Анотація:

Doped ceria-based (Gd0.2Ce0.8O1.9, GDC) solid electrolytes were prepared by Solid-phase synthesis method. The effect of doping bismuth oxide and samarium oxide on the phase and microstructure of GDC was investigated. The phase composition was analyzed by the X-ray diffraction (XRD).The single cubic fluorite structure was observed after doping these oxides. Appearance and microstructure of doped ceria-based solid electrolytes were analyzed by the scanning electron microscopy (SEM) and the transmission electron microscopy (TEM). The results showed that the doped trivalent cations had entered into the ceria structure uniformly. The density, porosity rate and water absorption of GDC were measured by Archimedes principle. It indicated that the density of doped GDC solid electrolyte increased with the rising of sintering temperature.

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45

Yin, Liu Yan, Xin Gui Zhou, Jin Shan Yu, Hong Lei Wang, Shuang Zhao, Zheng Luo, and Bei Yang. "Sintering Additive on the Pore Structure and Mechanical Properties of Si₃N₄ Ceramic Foam Produced by Protein Coagulation Casting." Key Engineering Materials 519 (July 2012): 281–86. http://dx.doi.org/10.4028/www.scientific.net/kem.519.281.

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Анотація:

Silicon nitride (Si3N4) ceramic foam was prepared from water-based Si3N4 slurries via protein coagulation casting method with egg white protein as the foam agent. The open porosity of the as-fabricated ceramic foams was close to 80%, and the compressive strength was about 20 MPa. Further, the content of sintering additive on the phase composition, pore structure and pore size distribution were investigated. Results indicate that with the increasing of sintering aids, more windows appear on the wall of pore and the average size increases. Moreover, Pore size distribution of as-fabricated ceramic not only changes with sintering additive addition but also varies with pore size.

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46

Wang, Xiao Bei, Yuan Hua Lin, and Xu Liang Deng. "Preparation and Characterization of Functional Gradient Porous ZrO₂ Ceramics." Key Engineering Materials 519 (July 2012): 287–90. http://dx.doi.org/10.4028/www.scientific.net/kem.519.287.

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Porous zirconium dioxide (ZrO2) ceramics has been widely used in biomedicine, heat-insulation and piezoelectric actuators. In this study, a kind of porous ZrO2 ceramics with the gradient porosity and pore sizes was designed to be a composite lamellar material. The porosity and pore size change regularly through the thickness of the layers. This porous lamellar zirconic material has been prepared by the solid state reaction consisting of yttria-stabilized zirconia (YSZ) and stearic acid (SA) powders. The porosity and pore size can be tuned by the addition of SA. The mechanical properties of the graded porous ZrO2 have been studied in detail. The results show that the mechanical characteristics of the gradient porous ZrO2 can be controlled by changing the porosity and pore size.

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47

Chang, Qi Bing, Xia Wang, Jian Er Zhou, Yong Qing Wang, Guang Yao Meng, and Xing Qin Liu. "Microstructure Modification of NiO/YSZ Anode in Solid Oxide Fuel Cell by Particle Size Gradation of YSZ." Key Engineering Materials 519 (July 2012): 32–35. http://dx.doi.org/10.4028/www.scientific.net/kem.519.32.

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Анотація:

The idealized microstructure of NiO/YSZ anode of solid oxide fuel cell (SOFC) is that YSZ structures the bone of the anode and NiO is segregated by YSZ to keep Ni from congregation. To obtain this microstructure, the mixture of coarse YSZ and fine YSZ was used. The effect of the particle size gradation of YSZ on the microstructure of anode was studied. The results show that the homogenous microstructure can be obtained when the mass ratio of the coarse YSZ (d50＝3.38µm) to the fine YSZ (d50＝0.4µm) is 7:3. The pre-sintering temperature has obvious effect on the porosity of the NiO/YSZ. The bending strength of NiO/YSZ and Ni/YSZ are 123MPa and 85MPa, respectively. The reduction of NiO to Ni has less effect on the bending strength for 40vol%Ni/YSZ (7/3).

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48

Zhang, Ying, Ai Chen, Cheng Liu, Hai Rong Wang, and Ze Song Li. "Effect of Nano Zirconia on Microstructure and Electrochemical Behavior of Aluminium-Zinc Sacrificial Anodes." Key Engineering Materials 519 (July 2012): 41–44. http://dx.doi.org/10.4028/www.scientific.net/kem.519.41.

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Анотація:

In this study, nano ZrO2 powders were incorporated into Al-5 wt% Zn sacrificial anode and the effect of ZrO2 contents (wt% =0.1, 0.2) on microstructures and electrochemical properties were investigated. The results show that the addition of nano ZrO2 was effective on improving metallurgical and electrochemical properties. With the increase of ZrO2 content, the dendritic structure is fined gradually and the corrosion current density values is also increased. The incorporation of ZrO2 also can result in a moderate efficiency value. When the ZrO2 content in the alloy was 0.2 wt%, the optimal microstructure, electrochemical properties and as high as 70% the efficiency value was obtained.

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49

Yan, Yi Zhi, Xiang Liu, Qing Ming Chen, and Shao Chun Zhang. "Preparation and Properties of La_2/3Sr_1/3MnO₃: Ag_x Polycrystalline Composites." Key Engineering Materials 519 (July 2012): 45–48. http://dx.doi.org/10.4028/www.scientific.net/kem.519.45.

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Анотація:

La2/3Sr1/3MnO3: Agx (LSMO: Agx) polycrystalline composites were prepared by co-precipitation method. Structure and performance of La2/3Sr1/3MnO3: Agx were investigated by X ray diffraction and R-T measurement. Results show that, all samples are perovskite structure. With the addition of Ag increased, the volume and conductivity of LSMnO: Agx were increased accordingly. The resistivity of the samples (x=0.30, 0.40) is only 10% of the pristine. The TCR of LSMO: Agx (x=0.3) is obtained maximum value of 3.39% as the Z value 0.50. It’s perhaps the proper candidate material to be high temperature electrode or near room temperature bolometer and infrared devices.

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50

Zhang, Hua Yong, Cong Sheng Guan, Tian Duo Li, and Xiao Deng Yang. "Technology of Polyphenylene Sulfide (PPS) Resin/Graphite Conductive Composite for Bipolar Plate." Key Engineering Materials 519 (July 2012): 49–52. http://dx.doi.org/10.4028/www.scientific.net/kem.519.49.

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Анотація:

A kind of conductive composite material for the bipolar plate of proton-exchange membrane fuel cells (PEMFC) was fabricated by the hot-pressure molding with graphite powders and polyphenylene sulfide (PPS) resin powders. The influencing factors including PPS resin content, molding pressure and molding temperature, and temperature holding time on the conductivity, flexural strength and density of the composite were investigated. It was found that the perfect conditions for the fabrication of bipolar plate were that the PPS resin content was 25%wt, the forming pressure was 20 MPa, the mold temperature was 320°C and the holding time was 25 min.

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