Artykuły w czasopismach: „Power cone”

1

Viswanath, G., i T. V. Sreenivas. "Cone-kernel representation versus instantaneous power spectrum". IEEE Transactions on Signal Processing 47, nr 1 (1999): 250–54. http://dx.doi.org/10.1109/78.738265.

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Soni, R. K., V. K. Mandloie, M. B. Pote i A. K. Nath. "Spinning cone water film power meter for high-power CO2 lasers". Optics & Laser Technology 39, nr 1 (luty 2007): 196–201. http://dx.doi.org/10.1016/j.optlastec.2005.03.003.

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Kyrala, G. A., A. Seifter, J. L. Kline, S. R. Goldman, S. H. Batha i N. M. Hoffman. "Tuning indirect-drive implosions using cone power balance". Physics of Plasmas 18, nr 7 (lipiec 2011): 072703. http://dx.doi.org/10.1063/1.3598179.

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Hien, Le Thi Khanh. "Differential properties of Euclidean projection onto power cone". Mathematical Methods of Operations Research 82, nr 3 (16.09.2015): 265–84. http://dx.doi.org/10.1007/s00186-015-0514-0.

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Kim, Sungjun, Sunghun Jung, Min-Hwi Kim, Tae-Hyeon Kim, Suhyun Bang, Seongjae Cho i Byung-Gook Park. "Nano-cone resistive memory for ultralow power operation". Nanotechnology 28, nr 12 (23.02.2017): 125207. http://dx.doi.org/10.1088/1361-6528/aa5e72.

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Murmu, Chandra Shekhar, Suman Majumdar i Kanan K. Datta. "C ii and H i 21-cm line intensity mapping from the EoR: impact of the light-cone effect on auto and cross-power spectra". Monthly Notices of the Royal Astronomical Society 507, nr 2 (17.08.2021): 2500–2509. http://dx.doi.org/10.1093/mnras/stab2347.

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ABSTRACT C ii line intensity mapping (LIM) is a potential technique to probe the early galaxies from the Epoch of Reionization (EoR). Several experiments e.g. CONCERTO, TIME, CCAT-p are underway to map the C ii LIM signal fluctuations from the EoR, enabling us to estimate the C ii power-spectrum and C ii × 21-cm cross-power spectrum. The observed LIM signal will have its time evolution embedded in it along the line of sight due to the finite traveltime of the signal from its origin to the observer. We have investigated this so-called light-cone effect on the observed statistics of our seminumerically simulated C ii signal from the EoR. Using a suit of simulated C ii and neutral hydrogen 21-cm maps and corresponding light-cone boxes, we have shown that the light-cone effect can impact the C ii power spectrum by more than 15 per cent at large scales ($k\sim 0.1\, \text{Mpc}^{-1}$, at $z$ = 6.8). We have also observed that the impact of light-cone effect on the C ii power spectrum drops with decreasing redshift within the redshift range considered here (7.2 ≲ $z$ ≲ 6). The C ii × 21-cm cross-power spectrum is also affected by light cone, and in our models where reionization ends before $z$ = 6, we find that the maximum impact on cross-power can reach up to 20 per cent. At $z$ = 6.4, we find comparatively pronounced variation in the light-cone effect with reionization history on the cross-power. Faster reionization histories have a more drastic light-cone effect on cross-power. We conclude that we need to incorporate the light cone in order to properly model the signal, constrain the EoR-related astrophysical parameters and reionization history using the C ii × 21-cm cross-power spectrum.

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Dhurandhar, Akshay S., i Amarsingh B. Kanase-Patil. "Experimental Study on Effect of Water Spray Characteristics on Performance of Cooling Tower". E3S Web of Conferences 170 (2020): 01009. http://dx.doi.org/10.1051/e3sconf/202017001009.

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Cooling tower is an indispensable part, used as a direct contact type heat exchanger mainly for evaporative cooling. Cooling tower generally dissipates, remove heat from thermal power plants. In an induced draft cooling tower of counter flow, used for a mini-steam power plant, hot water enters at the top, while the air is introduced at the bottom and exits at the top, air is allowed to come in contact with falling water droplets, causing evaporative cooling. A possibility of desired change with different spray angle, patterns, is tried and analysed. On findings, best suited spray nozzle angle resulted is 90°, and amongst three spray patterns, full cone, hollow cone and spiral type nozzle; full cone nozzle of 90° spray angle helps achieving efficiency up to 82%. The range increases successively from 9.8°C to 15.5°C for FC nozzle, in approach to WBT; the desirable fall of 3.56°C is attained with effectiveness of 81.63%.

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Pratiwi, Febrianti Zarra, Hari Setijono i Yusuf Fuad. "Effect of Plyometric Front Cone Hops Training and Counter Movement Jump Training to Power and Strenght of Leg Muscles". Jurnal SPORTIF : Jurnal Penelitian Pembelajaran 4, nr 1 (27.05.2018): 105. http://dx.doi.org/10.29407/js_unpgri.v4i1.12073.

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The purpose of this research is to increase performance athletes bolavoli and that basketball with the methods exercise plyometric front cone hops and plyometric counter movement jump. Thirty students who elected in accordance criteria will be conducted pretest to determine division of a group plyometric front cone hops, plyometric counter movement jump or the control group. Back leg dynamometer to measure the muscle power limbs and jump md to measure the power limb muscles.Will be given exercise for 6 weeks to masing-masing groups and treatment 3 times a week. Test results paired sample t-test show a method of exercise plyometric front cone hops significant influence on the variables of strength and power limb muscles, group plyometric counter movement jump significant influence on the variables of power limb muscles. It can be concluded that of the exercise plyometric front cone hops and plyometric counter movement jump more effective for the two components of the physical condition of strength and power limb muscles.

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TANAKA, Hirohisa. "Power transmission of a cone roller toroidal traction drive." JSME international journal. Ser. 3, Vibration, control engineering, engineering for industry 32, nr 1 (1989): 82–90. http://dx.doi.org/10.1299/jsmec1988.32.82.

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NAKANO, Keiichi, Yoshikazu TANAKA, Takashi MATSUOKA, Kazuhiko SAKAGUCHI i Kikuo OKAMURA. "Power Transfer Characteristic of Ring-Cone 3K Type CVT". Transactions of the Japan Society of Mechanical Engineers Series C 72, nr 714 (2006): 628–35. http://dx.doi.org/10.1299/kikaic.72.628.

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Chaturani, P., i S. Narasimman. "Flow of power-law fluids in cone-plate viscometer". Acta Mechanica 82, nr 3-4 (wrzesień 1990): 197–211. http://dx.doi.org/10.1007/bf01173628.

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Liang, Anhui, Kexin Yu, Xiaolin Min, Jing Li, Jianyu Li, Xiaoling Zuo i Youli Yao. "The Explanation of Photopic Luminous Efficiency Curve by Using Both of the Cones’ Optical Fiber Coupling Effects and the Absorption of L Cones". Sensors 23, nr 3 (30.01.2023): 1523. http://dx.doi.org/10.3390/s23031523.

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In this paper, we build four-part cone models to explore the coupling effect of seven cone fiber couplers. Moreover, this is the first study of the coupling effect of four layers of biological couplers in animals and other biological lives. We simulate the four layers cone couplers by using the beam propagation method, and we assume the input beam is located at the outer fiber of the central cone. Our simulation results showed that there are two wavelength regions (short and long wavelength regions) with the strongest coupling, where the most power of input optical powers of the central cones will transfer to the six surrounding cones after transmitting through the four layers of cone couplers. However, within a wavelength region of ±75 nm near to the peak wavelengths, located in the yellow–green wavelength range, the splitting ratios at the output of the outer segment of the central cone are always greater than the sum of the splitting ratios of the six surrounding cones. These cone couplers may play an important role in color preprocessing (e.g., doing opponent color processing partially). The cone fiber coupler effect and light absorption of cones are considered separately in our models. By taking account of both the cone fiber coupling effect and absorption of outer segment of L cone, we find the multiplication of the relative optical power of cone couplers, the spectral sensitivity data of the L cone, and a normalized coefficient that matches with the photopic luminous efficiency of the human eye well. This is the attempt to use both the cone fiber coupling effect and the absorption of L cones to explain the photopic luminous efficiency. The splitting ratios of the central cones are greater than 80% at peak wavelengths located in the yellow-green wavelength range, and this can help to explain why the human eye is more sensitive to green light.

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Takamure, Kotaro, Tomomi Uchiyama, Kosuke Horie i Hiroshi Nakayama. "Effect of cone on efficiency improvement of a self-powered IoT-based hydro turbine". Advances in Mechanical Engineering 14, nr 7 (lipiec 2022): 168781322211072. http://dx.doi.org/10.1177/16878132221107249.

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This study aims to improve the power generation performance of the self-powered IoT turbine flowmeter developed in our previous study. To achieve this, a cone was installed at the front-center of the rotor to accelerate the water flow and streamline the resulting high-speed flow toward the blade near the periphery of the rotor. The experiments and flow simulations served to explore the effects of the cone on the characteristics of the flowmeter. The results demonstrate that both the power generated by the cone-equipped rotor and the pressure loss increases with increasing cone diameter [Formula: see text], Consequently, the power efficiency is maximum at [Formula: see text] D = 0.375, where D is the outer diameter of the blade. The pressure difference between the front and rear of the blade for the cone-equipped rotor with [Formula: see text] D = 0.375 is significantly larger than that of the rotor without the cone. This pressure difference increases the torque acting on the blade, which increases the rotational speed and output of the rotor. In addition to the improvement in performance, the introduction of the cone facilitates flowrate measurement because it enables the relationship between the flowrate and the rotational speed of the rotor to be expressed as a linear function.

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Sakharov, D. F., i А. V. Vitushkin. "POWER ANALYSIS OF THE CRUSHING PROCESS IN A CONE CRUSHER". Izvestiya Visshikh Uchebnykh Zavedenii. Chernaya Metallurgiya = Izvestiya. Ferrous Metallurgy 61, nr 12 (16.01.2019): 980–86. http://dx.doi.org/10.17073/0368-0797-2018-12-980-986.

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The literature devoted to cone crushers design and research of its crushing process is generally based on empirical observations, therefore it is commonly considered that material is crushed under the influence of squeezing forces exclusively. Above mentioned liter ature, in turn, theoretical base forms for crushing units design. Based on common understanding, variety of designs of cone crushing machines existing today is characterized by integrity of principles of their work. Majority of theoretical works devoted to cone crushers are focused on such characteristics as efficiency, extent of crushing, increase in percent of useful fraction in ultimate product, or on operational parameters of separate structural elements such as lining armor resistance, increase in endurance of supporting and power nodes, etc. To increase those characteristics crushing cameras with irregular shape of lining armor are designed, design of an active crushing member combines elements of active members of other crushing machines (roll, cheek crushers). However effectiveness of kinematics of active member movement is considered only from the point of view of squeezing forces generation in crushed material and minimization of its slide against it. The uppermost ener gy brought to any crushing machines is spent on loa ding destroying crushed material. Authors of this article consider that under particular circumstances such work conditions can be provided in cone crushers under which energy efficiency of materials crushing process will increase considerably. One of such conditions is creation of multi-axial stress in crushed material. Some reference designs of cone crushers are considered in the article as well as range of their app lication. Mechanism of multi-axial stress generation in crushed material promoting decrease in energy consumption of crashing process is described. Recommendations on development of operating conditions of crushing machine creating multi-axial stress in crushed material are provided.

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Cheng, Jiayuan, Tingzhi Ren, Zilong Zhang, Xin Jin i Dawei Liu. "Influence of Two Mass Variables on Inertia Cone Crusher Performance and Optimization of Dynamic Balance". Minerals 11, nr 2 (4.02.2021): 163. http://dx.doi.org/10.3390/min11020163.

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Inertia cone crushers are widely used in complex ore mineral processing. The two mass variables (fixed cone mass and moving cone mass) affect the dynamic performance of the inertia cone crusher. Particularly the operative crushing force of the moving cone and the amplitude of the fixed cone are affected, and thus the energy consumption of the crusher. In this paper, the process of crushing steel slag is taken as a specific research object, to analyze the influence of two mass variables on the inertia cone crusher performance. A real-time dynamic model based on the multi-body dynamic (MBD) and the discrete element method (DEM) is established. Furthermore, the influence of the fixed cone mass and moving cone mass on the operative crushing force, amplitude and average power draw are explored by the design of simulation experiments. The predictive regression models of inertia cone crusher performance are obtained using response surface methodology (RSM). After increasing the fixed cone mass, the optimized amplitude, average power and moving cone mass are decreased by 37.1%, 33.1% and 10%, respectively, compared to without the adjustment. Finally, a more effective dynamic balancing mechanism of inertia cone crusher is achieved, which can utilize the kinetic energy of a balancer, and minimize the mass of the fixed and moving cone. The fixed cone mass and moving cone mass of a balancing crusher are decreased by 78.9% and 22.8%, respectively, compared to without the balancing mechanism.

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Lin, Nan Ming, Shih Chang Shei, Shoou Jinn Chang, Wei Chih Lai, Yang Ya Yu, Wun Cin Lin i Lo Hsin Ming. "Gan-Based Leds Grown on Cone-Shaped Patterned Sapphire Substrates with Peripheral Air Voids by Lateral Etching". Advanced Materials Research 422 (grudzień 2011): 542–46. http://dx.doi.org/10.4028/www.scientific.net/amr.422.542.

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In this study, the authors report that GaN-based LEDs prepared on 1.2μm, 1.4μm, and 1.7μm height of cone-shaped patterned sapphire substrates (CSPSS) with the formation of air voids at GaN/cone-shaped-patterned-sapphire-substrate interface by laser scribing and lateral etching with one-step MOCVD growth. With CSPSS, it can be seen that output powers were all significantly larger than that of LED with flat substrate (FS). Assisted by 20 min lateral etching, it was found that peripheral pyramid-like air-voids were formed on top of each cone of the CSPSS with 1.7μm height and the light output power increased by 13.8%, compared with the result of the CSPSS with 1.2μm height. Furthermore, it was also found that output power of LED prepared on 1.7μm height of CSPSS with 20 min lateral etching was 6.2 and 3.1% larger than those of LEDs prepared on 1.2μm and 1.4μm height of CSPSS with 20 min lateral etching, respectively.

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Liu, Xi, Qing-Hai Wang i Jiangbin Gong. "On the Quantization of AB Phase in Nonlinear Systems". Entropy 24, nr 12 (16.12.2022): 1835. http://dx.doi.org/10.3390/e24121835.

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Self-intersecting energy band structures in momentum space can be induced by nonlinearity at the mean-field level, with the so-called nonlinear Dirac cones as one intriguing consequence. Using the Qi-Wu-Zhang model plus power law nonlinearity, we systematically study in this paper the Aharonov–Bohm (AB) phase associated with an adiabatic process in the momentum space, with two adiabatic paths circling around one nonlinear Dirac cone. Interestingly, for and only for Kerr nonlinearity, the AB phase experiences a jump of π at the critical nonlinearity at which the Dirac cone appears and disappears (thus yielding π-quantization of the AB phase so long as the nonlinear Dirac cone exists), whereas for all other powers of nonlinearity, the AB phase always changes continuously with the nonlinear strength. Our results may be useful for experimental measurement of power-law nonlinearity and shall motivate further fundamental interest in aspects of geometric phase and adiabatic following in nonlinear systems.

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Sakharov, D. F., i A. V. Vitushkin. "Energy efficiency of a cone crusher with stops". Izvestiya. Ferrous Metallurgy 65, nr 10 (30.10.2022): 733–39. http://dx.doi.org/10.17073/0368-0797-2022-10-733-739.

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Metallurgical, construction and mining industries are based on the process of grinding various materials. The main method of primary preparation of raw materials is crushing of the extracted ore. Up to 4 % of the world’s electricity production is spent annually on crushing rocks to obtain the necessary fraction of material, and for a single mine, the share of energy consumption for crushing can reach 50 % of the annual volume. In addition to spending electricity directly on rocks destruction, some of it is spent on creating a power reserve for a crushing machine (hereinafter referred to as a crusher) due to the fact that currently there is no single method of theoretical calculation of the power of its electric drive, no single method of determining energy costs for rocks destruction. It is known that raw materials extracted from different deposits have different physical and mechanical properties, which has a significant impact on the grinding process. However, difference in power of electric drive of crushing machines is due to the difference in their standard sizes, and the geography of their application is taken into account by the creation of the above-mentioned power reserve. The above factors have a negative impact on the operating costs of metallurgical industry enterprises. The article discusses some designs of crushers in which the destruction of the crushed piece occurs as a result of complex stress state. New design of a cone crusher with stops is proposed, which allows reducing energy costs for crushing materials. Due to the presence of stops and simple kinematics of the working body movement, reduction in the power necessary for the destruction of pieces of brittle materials, regardless of their properties, is achieved. At the same time, in crushed pieces destroyed in a cone crusher with stops, it is possible to create a shear stress state, in which theoretically a reduction in power required for crushing brittle materials is achieved by 2 times in comparison with compression crushers. The conditions of occurrence of shear stress state in crushed pieces during their crushing in a cone crusher with stops are described. The authors give recommendations for the reconstruction of these conditions.

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Yang, Chao Jie, Jie Chen, Zhi Song Xie, Yi Hui Zeng, Dao Long Wang, Jian Ming Liang i You Ping Fan. "Optimizing Design of Accessories for High-Voltage XPLE Power Cables". Applied Mechanics and Materials 441 (grudzień 2013): 189–94. http://dx.doi.org/10.4028/www.scientific.net/amm.441.189.

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This paper describes the optimization design of prefabricated XPLE cable accessories and presents the formula of the design of stress cone. The finite element method for optimizing the design of the electric stress distribution inside the HV power cable joint and adjusting the length and curvature of the stress cone of this termination is discussed. The relationships between dimensions of stress cones structure and the electric field distribution were obtained.

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Chen, Xiongwen, Qinfeng Guo i Dale G. Brockway. "Power Laws in Cone Production of Longleaf Pine across Its Native Range in the United States". Sustainable Agriculture Research 6, nr 4 (28.08.2017): 64. http://dx.doi.org/10.5539/sar.v6n4p64.

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Longleaf pine (Pinus palustris Mill.) forests in the southeastern United States are considered endangered ecosystems, because of their dramatic decrease in area since European colonization and poor rates of recovery related to episodic natural regeneration. Sporadic seed production constrains restoration efforts and complicates sustainable management of this species. Previous studies of other tree species found invariant scaling properties in seed output. Here, using long-term monitoring data for cone production at seven sites across the native range of longleaf pine, we tested the possible presence of two types of power laws. Findings indicate that (i) the frequency distribution of cone production at seven sites, from 1958 to 2014, follows power law relationships with high level of significance; (ii) although there is no general trend in the dynamics of scaling exponents among all sites, there are dynamics of scaling exponents at each site, with sudden changes in scaling exponents generally corresponding to the years of higher or lower cone production; and (iii) Taylor’s power laws explain cone production at different locations, but the scaling exponents vary among these. Results from this computational approach provide new insight into the irregular cone production of longleaf pine at spatial and temporal scales. Integrated ecosystem monitoring will be necessary to more fully understand future changes in cone production.

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Martínez Vivas, A. I., i T. Kim. "Dynamic Investigations between Two- and Three-bladed Wind Turbines with Various Yaw, Tilt and Cone Angles". Journal of Physics: Conference Series 2265, nr 3 (1.05.2022): 032051. http://dx.doi.org/10.1088/1742-6596/2265/3/032051.

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Abstract Tilt and cone are included in wind turbine design to increase tower clearance. Yaw misalignments take place often during turbine operation. The combined effects of these parameters modify the relative wind speed experienced by wind turbine blades, thereby altering the turbine’s dynamics. Consequently, power and loads, key design considerations, are affected. In the absence of exhaustive research available on this topic, this paper provides a quantitative analysis on the impact of tilt, cone and yaw on power and loads. The DTU 10MW Reference Wind Turbine and its two-bladed equivalent are evaluated. The results are obtained using the aeroelastic code HAWC2. It is demonstrated that the ultimate and fatigue loads are greater in the two-bladed than in the three-bladed model during operations. Tilt, cone and ±10º yaw reduce the annual energy production by up to 1%. These three parameters generally increase ultimate and fatigue loads. However, the relationship between these parameters and their impact on the bending moments of both wind turbines is complex, and the results are configuration dependent. It is concluded that the combination of these three parameters must be included as part of the design load examination of any target wind turbine.

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Gao, Hong, i Zhiheng Wang. "Hydrodynamic Response Analysis and Wave Energy Absorption of Wave Energy Converters in Regular Waves". Marine Technology Society Journal 51, nr 1 (1.01.2017): 64–74. http://dx.doi.org/10.4031/mtsj.51.1.7.

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AbstractThe hydrodynamic response and the energy capture analysis of wave energy converters (WECs) with three degrees of freedom are conducted using a frequency domain approach. Considering the coupled hydrodynamic coefficients between surge and pitch, motion responses in surge, heave, and pitch are solved for the WECs. The power take-off (PTO) damping is taken as a linear function of the velocity. The power absorption and the absorption efficiency in surge, heave, and pitch are analyzed and compared. The effects of the geometry, diameter, draft, center of gravity position, and PTO damping on the hydrodynamic response, the power absorption, and the absorption efficiency of WECs are investigated. A cylinder, a halfsphere cylinder, and a cone cylinder are examined. From the total power absorption and the efficiency, the cone is the optimum geometry. For the cylinder, the power absorption in heave increases obviously with the increase of the diameter or the draft in a certain range. For the cone, the effect of diameter and draft on the power absorption in heave is relatively small. The cone has a better ability to absorb power in surge and pitch with an intermediate draft and diameter, and the power absorption peak in pitch decreases as Zg increases. The center of gravity position has no effect on the hydrodynamic response and the power absorption in heave. For a cylinder, the optimal PTO damping in heave is higher than that in pitch and surge. The optimum frequency in heave is lower than that in pitch and surge.

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Wu, Shao Hua, Shi Hong Shi, Jun Yan Xiao i Ge Yan Fu. "Study on Characteristics of Inner Ring Laser Powder Feed Molten Pool of Thin Workpiece". Applied Mechanics and Materials 43 (grudzień 2010): 565–68. http://dx.doi.org/10.4028/www.scientific.net/amm.43.565.

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In order to obtain the characteristic parameters of molten pool and realize real-time control of laser power, a high-speed CCD is used to monitor the laser rapid forming process of thin-walled rotating hollow cone, which is based on the technology of "hollow beam, powder tube center, inside-beam powder feeding".Experiments show that: In the plateau stage, pool area changes in 0.25mm2-0.7mm2, laser power remains at about 1kw, formed parts achieves maximum height of 55mm.

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Balmain, K. G., A. A. E. Luttgen i P. C. Kremer. "Power flow for resonance cone phenomena in planar anisotropic metamaterials". IEEE Transactions on Antennas and Propagation 51, nr 10 (październik 2003): 2612–18. http://dx.doi.org/10.1109/tap.2003.817542.

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Shintake, T. "Nose-cone removed pillbox cavity for high power klystron amplifiers". IEEE Transactions on Electron Devices 38, nr 4 (kwiecień 1991): 917–23. http://dx.doi.org/10.1109/16.75224.

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Gröndahl, Albin, Gauti Asbjörnsson, Erik Hulthén i Magnus Evertsson. "Diagnostics of cone crusher feed segregation using power draw measurements". Minerals Engineering 127 (październik 2018): 15–21. http://dx.doi.org/10.1016/j.mineng.2018.07.008.

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Datta, Kanan K., Garrelt Mellema, Yi Mao, Ilian T. Iliev, Paul R. Shapiro i Kyungjin Ahn. "Light-cone effect on the reionization 21-cm power spectrum". Monthly Notices of the Royal Astronomical Society 424, nr 3 (3.07.2012): 1877–91. http://dx.doi.org/10.1111/j.1365-2966.2012.21293.x.

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Bearman, R. A., R. W. Barley i A. Hitchcock. "Prediction of power consumption and product size in cone crushing". Minerals Engineering 4, nr 12 (styczeń 1991): 1243–56. http://dx.doi.org/10.1016/0892-6875(91)90170-z.

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Garrioch, S. H., i D. F. James. "A Finite-Element Study of Newtonian and Power-Law Fluids in Conical Channel Flow". Journal of Fluids Engineering 119, nr 2 (1.06.1997): 341–46. http://dx.doi.org/10.1115/1.2819139.

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A numerical study of Newtonian and shear-thinning fluids in high-speed, laminar flow through a conical channel is presented. Using a variety of cone-angles and Reynolds numbers on the order of 100, converging flow is mapped according to several characteristics: the angle at which separation occurs at the cone outlet, the extent to which sink-flow is approximated, and the pressure drop through the cone. While the data provides a fundamental description of conical flow, it may be of particular usefulness to rheologists in establishing an inelastic baseline for a converging-flow rheometer.

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Chen, Lin, Wen Bing Yu, Wei Bo Liu i Xin Yi. "Numerical Simulation of Pile Foundations of Qinghai-Tibet Power Transmission Line: Influence of Temperature Region". Applied Mechanics and Materials 501-504 (styczeń 2014): 218–23. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.218.

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To analyze the thermal effect of the pile foundation of permafrost, a two-dimensional transient finite element model of the thermal fields with phase change were established. The developments of heat influence limit and maximum thawed depth with and without climate warming were predicted and analyzed. Results indicate that (1) the heat influence limit and maximum thaw depth in permafrost regions enlarge with time elapse, while the global climate warming will have a greater influence to full-space pile foundation compared with the cone-cylinder pile foundation; (2) Considering the global climate warming, heat influence limit (Lmax) and maximum thaw depth (Hmax) in 50th year for full-space pile foundation, cone-cylinder pile foundation are 10.1m, 5.2m, 4.1m, 3.7m, respectively; the maximum thaw depth of full-space pile foundation during the operation will have exceeded the depth of structure (2.5m), which might put the structure at risk; (3) the structure of cone-cylinder pile foundation could effectively preserve permafrost and avoid pile foundations failure; (4) the spacing of cone-cylinder pile foundations is reasonable and the interaction of temperature distribution among cone-cylinder pile foundations can be negligible.

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Babu, G. V. R., i G. N. Alemayehu. "Fixed points of nodal contractions in cone metric spaces". Tamkang Journal of Mathematics 42, nr 1 (22.03.2011): 39–51. http://dx.doi.org/10.5556/j.tkjm.42.2011.595.

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We introduce local power contractions and nodal contractions in cone metric spaces and prove the existence of fixed points of such contractions in cone metric spaces. Our theorems generalize the results of Haung and Zhang [L-G. Haung, X. Zhang, Cone metric spaces and fixed point theorems of contractive mappings, J. Math. Anal. Appl. 332 (2007) 1468-1476].

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MA, BO-QIANG, i JI SUN. "NEW SCALING VARIABLE FROM LIGHT-CONE PERTURBATION THEORY". International Journal of Modern Physics A 06, nr 03 (30.01.1991): 345–63. http://dx.doi.org/10.1142/s0217751x91000216.

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We argue from both the quark language and the free field light-cone expansion in light-cone perturbation theory that the constraint of overall “energy” conservation in deep inelastic lepton-nucleon scattering yields a similar new scaling variable xp, which reduces to the Weizmann variable, the Bloom-Gilman variable and the Bjorken variable at some approximations. The xp rescaling is expected to be a good scaling variable, and hence gives strong power-law type corrections to the deviations of Bjorken scaling. An understanding of this xp rescaling from both the free field operator product expansion (OPE) and the ordinary OPE is also given, indicating it is likely a higher order effect in the coefficient functions, i.e. it does not belong to the higher twist effect. Therefore this xp rescaling is likely a new effect contributing to the power-law type corrections.

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33

Darusalam, Ucuk, Purnomo Sidi Priambodo i Eko Tjipto Rahardjo. "Optical Spatial Filter to Suppress Beam Wander and Spatial Noise Induced by Atmospheric Turbulence in Free-Space Optical Communications". Advances in Optical Technologies 2015 (18.05.2015): 1–6. http://dx.doi.org/10.1155/2015/594628.

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We propose an optical spatial filter (OSF) method to suppress beam wander and spatial noise effects. Signal from random displacements of the focus spot around the optical axis within the constricted area is collected. This method advantageously suppresses fluctuations in signal intensity. The OSF consists of a pinhole and cone reflector. The pinhole produces Fresnel diffraction on the focus spot. The cone reflector provides directed reflectance onto the pinhole for random focus spot displacements due to beam wander. The calculations of signal power are based on fluctuations of signal intensity that are minimized by the circular aperture function of the pinhole and the cosine of the reflectance angle from the cone reflector. The method is applied to free-space optical communications at a wavelength of 1.55 μm with an atmospheric chamber to provide optical propagation media. Based on calculations, the beam wander angles that can be received by the OSF are from 14.0° to 28.0°. Moreover, based on experiment, the OSF with a pinhole diameter of 20.0 μm and cone reflector diameter of 1.5 mm produces signal power of −15.3 dBm. Both calculations and experiment show that the OSF enhances the received signal power in the presence of turbulence.

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Furqoni, Randi Sofyan, i Andun Sudijandoko. "The comparison of rope jump, cone step up, and diagonal to the power and agility". Jurnal SPORTIF : Jurnal Penelitian Pembelajaran 5, nr 1 (28.05.2019): 140. http://dx.doi.org/10.29407/js_unpgri.v5i1.12842.

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This study aims: (1) to determine the effect of rope jump training on increasing leg muscle power and agility; (2) to determine the effect of step-up training on increasing leg muscle power and agility 3) to determine the effect of diagonal cone hops exercises on increasing leg muscle power and agility; and (4) to find out the differences in the effect of pliometric rope jump, step up, and diagonal cone hops exercises on increasing leg muscle power and agility. The sample of this study was 40 students of futsal extracurricular at Firdaus Jembrana High School. This type of research is quantitative research with a quasi-experimental method. The study design used a pre-test and post-test non-randomized control group, with data analysis using MANOVA. The process of collecting data was to use leg muscle power tests by using jump df and agility tests using the agility T-test during the pre-test and post-test. Then the research data were analyzed using SPSS ver 16.0. It can be concluded that there is an increase in limb muscle power and agility for each group after being given training with a significant value <0.05 in the paired sample t-test. Increased limb muscle power by 12% and 1% agility in rope jump training, 5% increase in leg muscle power and 1% agility in step-up exercises, and increased leg muscle power by 8% and 2% agility in diagonal cone hops exercises.

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35

Yamamoto, Ryo, Suguru Mototani, Kae Doki i Akihiro Torii. "Transmission Characteristics of Wireless Power Transmission Using a Cone Spiral Coil". Journal of the Japan Society of Applied Electromagnetics and Mechanics 29, nr 2 (2021): 315–20. http://dx.doi.org/10.14243/jsaem.29.315.

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Hao, Zijun, Zhongping Wan, Xiaoni Chi i Jiawei Chen. "A power penalty method for second-order cone nonlinear complementarity problems". Journal of Computational and Applied Mathematics 290 (grudzień 2015): 136–49. http://dx.doi.org/10.1016/j.cam.2015.05.007.

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Hao, Zijun, Zhongping Wan i Xiaoni Chi. "A power penalty method for second-order cone linear complementarity problems". Operations Research Letters 43, nr 2 (marzec 2015): 137–42. http://dx.doi.org/10.1016/j.orl.2014.12.012.

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Loker, William M. "Power in the Southern Cone Borderlands: An Anthropology of Development Practice". American Ethnologist 27, nr 4 (listopad 2000): 993–94. http://dx.doi.org/10.1525/ae.2000.27.4.993.

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Zhang, Fan, Zhuzheng Shen, Wen Xu, Guofeng Wang i Biyi Yi. "Optimal Power Flow Algorithm Based on Second-Order Cone Relaxation Method for Electricity-Gas Integrated Energy Microgrid". Complexity 2021 (19.08.2021): 1–11. http://dx.doi.org/10.1155/2021/2073332.

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Due to the existence of nonlinear constraints, it is difficult to solve the power flow directly. This paper proposes a microgrid optimal scheduling strategy using second-order cone relaxation method to realize linear transformation, so as to minimize the total cost of the microgrid. Firstly, a microgrid system model of electricity-gas integrated energy is established, and the nonlinear constraints of branch power flow are transformed by the second-order cone relaxation method. Then, based on the microgrid model, the application conditions of the second-order cone relaxation transformation method are studied, and the optimal scheduling strategy with the total cost of microgrid as the objective function is proposed. In addition, in the case that the microgrid system does not meet the application conditions of second-order cone programming, the optimization problem is solved by increasing the line loss. Finally, an example is given to verify the effectiveness of the proposed method.

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Prakash, J., S. Gouse Mohiddin i S. Vijaya Kumar Varma. "Free Convective MHD Flow Past a Vertical Cone with Variable Heat and Mass Flux". Journal of Fluids 2013 (18.11.2013): 1–8. http://dx.doi.org/10.1155/2013/405985.

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A numerical study of buoyancy-driven unsteady natural convection boundary layer flow past a vertical cone embedded in a non-Darcian isotropic porous regime with transverse magnetic field applied normal to the surface is considered. The heat and mass flux at the surface of the cone is modeled as a power law according to qwx=xm and qw*(x)=xm, respectively, where x denotes the coordinate along the slant face of the cone. Both Darcian drag and Forchheimer quadratic porous impedance are incorporated into the two-dimensional viscous flow model. The transient boundary layer equations are then nondimensionalized and solved by the Crank-Nicolson implicit difference method. The velocity, temperature, and concentration fields have been studied for the effect of Grashof number, Darcy number, Forchheimer number, Prandtl number, surface heat flux power-law exponent (m), surface mass flux power-law exponent (n), Schmidt number, buoyancy ratio parameter, and semivertical angle of the cone. Present results for selected variables for the purely fluid regime are compared with the published results and are found to be in excellent agreement. The local skin friction, Nusselt number, and Sherwood number are also analyzed graphically. The study finds important applications in geophysical heat transfer, industrial manufacturing processes, and hybrid solar energy systems.

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Zhu, Wen Tao, Xu Liu i Jing Bo Yang. "Joint Beamforming and Power Optimization with Per-Antenna Power Constraints in Cognitive MISO System". Applied Mechanics and Materials 742 (marzec 2015): 674–78. http://dx.doi.org/10.4028/www.scientific.net/amm.742.674.

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Joint Beamforming and power allocation schemes are considered for cognitive radio (CR) multiple input single output (MISO) system in this paper. We considered the robust downlink beamforming and power allocation problem with per-antenna power constraints which is more realistic in practice, instead of sum-power constraint, under the imperfect channel state information (CSI). Since the given optimization problem is a non-convex problem which is difficult to handle, we transformed it into second order cone program (SOCP) problem, which can be solved efficiently. Simulation shows that the proposed scheme indeed has a better performance in CR system.

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Firmanto, Hendy, Edy Suharyanto i Kuswanto. "Performance of Cooled Cone Grinding Machine in Cocoa Cake Processing". Pelita Perkebunan (a Coffee and Cocoa Research Journal) 31, nr 2 (31.08.2015): 119–29. http://dx.doi.org/10.22302/iccri.jur.pelitaperkebunan.v31i2.152.

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The process of cocoa paste pressing has a function to separate the fatty component of cocoa from its cake. Cocoa paste is further processed into cocoa powder using grinding machine for cocoa cake. The cooled cone type of cocoa grinding machine is used to solve the problem of plug in the maschine caused by melting of fat in cocoa cake due to hot effect as a result of friction in the grinding machine. Grinding machine of cocoa has conical form of cylinder for grinding and stator wall wrapped by source of cold and closed with jacket wool. Research was conducted at Kaliwining Experimental Garden of Indonesian Coffee and Cocoa Research Institute (ICCRI) using cocoa cake containing 26.75% originated from Forastero type of cocoa seed. The capacity and recovery of the machine was influenced by space between rotor cylinder and stator wall. Grinding machine operated at cooling temperature of 25.5oC and space between rotor – stator 0.9 cm and the capacity of 187.5 kg/hour with recovery of 200 mesh cocoa powder as much as 24%. The maximum power of machine required was 2.5 kW with efficiency of energy transfer of 97%. Results of proximate analysis showed that there was no change of protein content, but protein and carbohydrate content increased after processing, i.e. from 5.70% and 59.82% into 5.80% and 61.89% respectively.Key words : cocoa cake, cooling, grinding, cocoa powder

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Kang, Peng, Wei Guo, Weigang Huang, Zejing Qiu, Meng Yu, Feng Zheng i Yachao Zhang. "Two-Stage Stochastic Programming Scheduling Model for Hybrid AC/DC Distribution Network Considering Converters and Energy Storage System". Applied Sciences 10, nr 1 (25.12.2019): 181. http://dx.doi.org/10.3390/app10010181.

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The development of DC distribution network technology has provided a more efficient way for renewable energy accommodation and flexible power supply. A two-stage stochastic scheduling model for the hybrid AC/DC distribution network is proposed to study the active-reactive power coordinated optimal dispatch. In this framework, the wind power scenario set is utilized to deal with its uncertainty in real time, which is integrated into the decision-making process at the first stage. The charging/discharging power of ESSs and the transferred active/reactive power by VSCs can be adjusted when wind power uncertainty is observed at the second stage. Moreover, the proposed model is transformed into a mixed integer second-order cone programming optimization problem by linearization and second-order cone relaxation techniques to solve. Finally, case studies are implemented on the modified IEEE 33-node AC/DC distribution system and the simulation results demonstrate the effectiveness of the proposed stochastic scheduling model and solving method.

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Al Baidani, Mashael, i Judi McDonald. "On the Block Structure and Frobenius Normal Form of Powers of Matrices". Electronic Journal of Linear Algebra 35 (1.02.2019): 297–306. http://dx.doi.org/10.13001/1081-3810.3955.

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The Frobenius normal form of a matrix is an important tool in analyzing its properties. When a matrix is powered up, the Frobenius normal form of the original matrix and that of its powers need not be the same. In this article, conditions on a matrix $A$ and the power $q$ are provided so that for any invertible matrix $S$, if $S^{-1}A^qS$ is block upper triangular, then so is $S^{-1}AS$ when partitioned conformably. The result is established for general matrices over any field. It is also observed that the contributions of the index of cyclicity to the spectral properties of a matrix hold over any field. The article concludes by applying the block upper triangular powers result to the cone Frobenius normal form of powers of a eventually cone nonnegative matrix.

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Ding, Liangliang, Jingyuan Zhou, Wenhui Tang i Xianwen Ran. "Damage Characteristics Analysis of the Truncated Cone-Shaped PELE Projectile". Symmetry 11, nr 8 (9.08.2019): 1025. http://dx.doi.org/10.3390/sym11081025.

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The PELE (penetrator with enhanced lateral efficiency) projectile is a new type of penetrator, which has both penetration and fragmentation effects. The damage characteristics of the PELE projectile have never been studied from the perspective of changing the shape of the projectile structure until now. This paper hopes to improve the damage power by changing the structural shape of PELE projectile, and the concept of a truncated cone-shaped PELE projectile is first put forward. In order to compare and analyze the damage power of the truncated cone-shaped PELE projectile and the conventional PELE projectile, six sets of simulation conditions were designed, and the penetration ability and fragmentation effect were used as the main evaluation indicators. According to the known structural parameters of the PELE projectile, the range of angle α of the truncated cone-shaped PELE projectile was determined to be 86.2°–90°. In addition, there is little difference in penetration ability between the two different types of PELE projectile; the damage effect of the truncated cone-shaped PELE projectile on the after-effect target is better than that of the conventional PELE projectile. It is hoped that through further structural optimization, the truncated cone-shaped PELE projectile will have more extensive engineering application value.

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KOMATSUBARA, Hidenori, Takayuki YAMAZAKI i Sadatomo KURIBAYASHI. "5134 Research and Development of Cone to Cone Type CVT : 2^ report, Design and Power Transfer Efficiency of CTC-CVT". Proceedings of the JSME annual meeting 2006.4 (2006): 213–14. http://dx.doi.org/10.1299/jsmemecjo.2006.4.0_213.

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Seifu, Yared, Simie Tola i Amana Wako. "Evaluation of Tractor Field Performance Using Visual Basics Programming for Agricultural Farm Lands". American Journal of Agricultural Science, Engineering, and Technology 7, nr 1 (16.02.2023): 53–59. http://dx.doi.org/10.54536/ajaset.v7i1.1132.

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The purpose of this research was to developed a program in visual basic software for predicting tractor implement performance of tractor implement combination. A conventional tillage system with a mounted mouldboard plough and three bottoms was used to collect data from a Chery tractor (Model RM750) with a four-wheel drive. The soil texture class were determined in laboratory. Soil cone index value was measured using a SpotOn digital compaction meter. The output of the visual basics simulation in this study was obtained by varying the depth of operation and soil cone index for an experimental farm field. From the simulation output the results this study covers of drawbar power, implement draft, pull, tractive force, fuel consumption, slip, power delivery efficiency, dynamic weight and wheel dynamic reactions were drawn by varying depth and soil cone index value.

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Gouse, Mohiddin, Anwar Bég i Vijaya Varma. "Numerical study of free convective MHD flow past a vertical cone in non-Darcian porous media". Theoretical and Applied Mechanics 41, nr 2 (2014): 119–40. http://dx.doi.org/10.2298/tam1402119g.

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A numerical study of buoyancy-driven unsteady natural convection boundary layer flow past a vertical cone embedded in a non-Darcian isotropic porous regime with transverse magnetic field applied normal to the surface is considered. The heat and mass flux at the surface of the cone is modeled as a power-law according to qw(x) = xm and q*w (x) = xn respectively, where x denotes the coordinate along the slant face of the cone. Both Darcian drag and Forchheimer quadratic porous impedance are incorporated into the two-dimensional viscous flow model. The transient boundary layer equations are then non-dimensionalized and solved by the Crank-Nicolson implicit difference method. The velocity, temperature and concentration fields have been studied for the effect of Grashof number, Darcy number, Forchheimer number, Prandtl number, surface heat flux power-law exponent (m), surface mass flux power-law exponent (n), Schmidt number, buoyancy ratio parameter and semi-vertical angle of the cone. Present results for selected variables for the purely fluid regime are compared with the non-porous study by Hossain and Paul [9] and are found to be in excellent agreement. The local skin friction, Nusselt number and Sherwood number are also analyzed graphically. The study finds important applications in geophysical heat transfer, industrial manufacturing processes and hybrid solar energy systems.

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Yu, Luo-jian, i Xin Tong. "Study on the technical parameters model of the functional components of cone crushers". Nonlinear Engineering 11, nr 1 (1.01.2022): 175–85. http://dx.doi.org/10.1515/nleng-2022-0022.

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Abstract A cone crusher is a machine that crushes rock materials with high efficiency and low power consumption; it is one of the typical road construction equipment. To improve the production efficiency, mechanical performance, and crushing performance of the cone crusher, thus increasing profit, this study used Discrete element method (DEM) particle analysis software to optimize the structure of the moving cone, studied the crushing effect of the crusher, and carried out kinetics analyses. Based on DEM, the structure of the cone crusher cavity was analyzed and optimized. A Y51 cone crusher was selected as a representative example to study its moving cone structure. By analyzing the factors that affect the performance and efficiency of the crusher, the precession angle, base angle, shape, and rotational speed of the moving cone were optimized. Using the Genetic Algorithm-Support Vector machine method (GA-SVW), the optimal combination of parameters was determined, and the key parts of the crusher were thus optimized.

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Dareing, D. W. "Vibrations Increase Available Power at the Bit". Journal of Energy Resources Technology 107, nr 1 (1.03.1985): 138–41. http://dx.doi.org/10.1115/1.3231153.

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Drillstring vibrations are generally considered to be detrimental to downhole drilling equipment because they produce cyclic or fatigue loading. Tool joint failures, tubular washouts, and bit breakage are often fatigue related. On the positive side, dynamic forces applied to roller cone rock bits have the potential to increase penetration rate. This paper quantifies the available vibration energy at the bit and shows how to control the level of energy through bottom hole assembly design and rotary speed.

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