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Статті в журналах з теми "+330.341"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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1

Дмитрієв, Ілля, та Оксана Дмитрієва. "ОСОБЛИВОСТІ ТА ТЕНДЕНЦІЇ ЦИФРОВОЇ ЕКОНОМІКИ В УКРАЇНІ". Проблеми і перспективи розвитку підприємництва, № 27 (14 листопада 2021): 60. http://dx.doi.org/10.30977/ppb.2226-8820.2021.27.60.

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Анотація:
УДК 330.341; JEL Classification: O33 Мета: Метою статті є вивчення основних тенденцій розвитку цифрової економіки України та ідентифікація чинного законодавчого підґрунтя. Методика дослідження: В роботі використано методи аналізу та синтезу, системний підхід, порівняльний аналіз. Результати: Характерною ознакою сучасного етапу розвитку економіки є використання цифрових технологій, які стали каталізатором різкого збільшення мобільності товарних та фінансових потоків, забезпечують високу швидкість передачі інформації, внесли значний вклад в глобалізаційні та інтеграційні процеси світової економіки. Інформаційні технології стали невід’ємною частиною суспільних відносин та призвели до появи нових галузей господарства, ринків, конкурентних товарів та послуг. Одним із важливих параметрів, які на світовому рівні визначають якість та ступінь розвитку цифрової економіки, є світові рейтинги. Згідно з Концепцією розвитку цифрової економіки та суспільства України на 2018-2020 основними рейтинговими цілями її реалізації є досягнення визначених позицій у рейтингу. Для аналізу особливостей та тенденцій розвитку цифрової економіки України авторами проведено дослідження рейтингових індексів, що дають змогу оцінити її стан: Digital Economy and Society Index; Digital Evolution Index; Digital Adoption Index; ICT Development Index; Global Innovation Index; Networked Readiness Index; e-Intensity; IMD World Digital Competiveness Index; Global Competitiveness Index. В дослідженні проведено аналіз стану рівня використання та розвитку цифрових технологій в країні. Наукова новизна: існуючі нормативно-правові акти, що регламентують розвиток цифрової економіки України, актуалізують необхідність їх уніфікації та консолідації у вигляді Стратегії розвитку цифрової економіки України як стійкого законодавчого підґрунтя для забезпечення стратегічного розвитку цифрової економіки держави. Забезпечення розвитку цифрової економіки України передбачається через періодичне прийняття строкових програмних документів на у формі чинної Концепції розвитку цифрової економіки та суспільства України на 2018-2020 роки. Практична значущість: проведений аналіз та визначені особливості та тенденції розвитку цифрової економіки складають інтерес для органів державної влади, до відання яких належить регулювання цифрової економіки; для вітчизняних та зарубіжних науковців, що ведуть дослідження з цього питання.
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2

Raghuram, Lalitha, Sunil Shroff, and Pallavi Kumar. "330.3." Transplantation 103 (November 2019): S70—S71. http://dx.doi.org/10.1097/01.tp.0000611956.85263.a4.

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3

Lu, Ling Ling, Chen Guang Huang, and Xi Wang. "A Damage Identification Method Based on Differential Gradient of Normalized Strain." Applied Mechanics and Materials 330 (June 2013): 321–30. http://dx.doi.org/10.4028/www.scientific.net/amm.330.321.

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Анотація:
A damage identification method based on differential gradient of normalized strain (DGNS) is presented to overcome the disadvantages of traditional static damage identification, such as the complicacy of measurement system and the limited measurement points etc. Two numerical simulations were conducted on a dog-bone specimen to verify the feasibility of the method. In the experiment, differential of strain contour density (DSCD), which has the same physical meaning with DGNS，significantly improves the smoothness and visualization of field information. Both the simulation and experiment results show that, DGNS (DSCD) is capable of describing the structural damage property meanwhile effectively isolates the damaged areas from regions with inhomogeneous deformation due to geometric inhomogeneity. Moreover, DGNS (DSCD) is a structural intrinsic parameter, and independent on external loads.
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4

Xiong, Rui, Jun Feng Shi, Qun Hui An, and Tian Qing Yu. "Numerical Analysis on Collision Process of Rigid Body and Box Girder." Applied Mechanics and Materials 330 (June 2013): 331–37. http://dx.doi.org/10.4028/www.scientific.net/amm.330.331.

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Анотація:
Through analyzing the real collision process of a steel plate rolling sliding off a lorry and box girder flange of an overpass, the damage degree of box girder may be known, and in this article the collision process is also simulated by means of finite element method so that it may be obtained how the damaged girder collapses and the cracks propagate. Furthermore, the dynamic characteristics are studied during the collision process and the reliability of overpass section collision is analyzed from the angle of energy transfer and dissipation.
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5

Wang, Jian Xin, Xian Wei Gao, Mei Li Sui, and Xiu Ying Li. "Study on Irrigation Model Based on Plant Ultrasonic Acoustic Emissions." Applied Mechanics and Materials 330 (June 2013): 346–49. http://dx.doi.org/10.4028/www.scientific.net/amm.330.346.

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Анотація:
Produced by cohesion between water molecules or adhesion to the conduit wall, the plant cavitation is accompanied by the vessel walls vibration which is the indicator of the water stress. The ultrasonic acoustic emissions (UAEs) are used to detect the plant cavitation events which are the transmission of vibration. The UAEs could be detected in ultrasonic frequencies between 100K Hz and 1 MHz. The PCI-2 data acquisition (DAQ) equipment and R15 sensors are used to improve the precision of cavitation detection. When the water stress and dehydration gets heavier, the UAEs rate gets higher. Use the tomato practice data with the empirical deduction under the modern greenhouse conditions, the UAEs and Transpiration Index (UAETI) and the UAEs Irrigation Index (UAEII) irrigation model are draw from the relationship between transpiration and UAEs. UAETI can be used to analysis the transpiration, and UAEII can be used to analysis the irrigation time. It is better to use UAEs technique to carry out automatic and precise irrigation for the plant and to improve the effect of Water-saving irrigation.
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6

Рогаткин, Ю. Б. "СХЕМА НОРМАЛИЗАЦИИ КАНАЛА СБОРА ДАННЫХ НА ОСНОВЕ УСИЛИТЕЛЯ С ПРОГРАММИРУЕМЫМ КОЭФФИЦИЕНТОМ УСИЛЕНИЯ". NANOINDUSTRY Russia 13, № 4s (11 вересня 2020): 330–31. http://dx.doi.org/10.22184/1993-8578.2020.13.4s.330.331.

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7

Аникин, А. А., К. А. Епифанцев та П. К. Скоробогатов. "ОСНОВНЫЕ ОСОБЕННОСТИ ИСПЫТАНИЙ МИКРОСХЕМ НА ИМПУЛЬСНУЮ ЭЛЕКТРИЧЕСКУЮ ПРОЧНОСТЬ". Nanoindustry Russia 14, № 7s (3 жовтня 2021): 330–31. http://dx.doi.org/10.22184/1993-8578.2021.14.7s.330.331.

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Анотація:
Рассмотрены методические основы испытаний изделий полупроводниковой электроники на импульсную электрическую прочность. Проанализированы основные требования нормативной документации к проведению испытаний. Описаны методы проведения испытаний и их особенности.
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8

Parvez, Mohammed Anwar, Md Barkatul Alam, and Md Manik Mia. "Confirmation of aflatoxin in fish and shrimp by LC/MS-MS (ZEVO TQD)." Asian-Australasian Journal of Food Safety and Security 4, no. 1 (May 30, 2020): 14–21. http://dx.doi.org/10.3329/aajfss.v4i1.53876.

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Анотація:
Mycotoxins are agricultural contaminants of fungal origin occurring at all latitudes worldwide and being characterized by acute and chronic effects on human health and animal wellness, depending on the species sensitivity. Various types of crops like maize, wheat, soybeans etc are used as raw materials for preparing feed of fish and shrimp. They are particularly susceptible to infection by Aspergillus following prolonged exposure to a high humidity environment. For this reason, the fish and shrimp samples should be tested for identifying and quantifying mycotoxin. The major mycotoxins of food concern are aflatoxin (B1, B2, G1, G2) for its toxicity. This paper focus on the confirmation of aflatoxin in fish and shrimp by developing method and validated it by LC/MS-MS (ZEVO TQD) which is important for ensuring the safety of fishery product for human consumption. The monitored MRM transitions for B1, B2, G1, G2 were m/z 31357 and m/z 31371, m/z 31888 and m/z 318256, m/z 328.75242.99 and m/z 328.75199.9, m/z 330.3488 and m/z 330.34106 respectively. Limit of decision (CCα) for B1, B2, G1, G2 were 0.59 μg/kg, 0.70 μg/kg, 0.68 μg/kg, 0.83 μg/kg respectively and detection capability (CCβ) for B1, B2, G1, G2 were 1.01μg/kg, 1.19 μg/kg, 1.15 μg/kg, 1.40 μg/kg respectively. Asian Australas. J. Food Saf. Secur. 2020, 4 (1), 14-21
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9

Long, Sheng Jie, and Shi Hong Huang. "Discussion of Design Ideas in Product Development Design Based on Product Extension in Marketing." Advanced Materials Research 328-330 (September 2011): 314–17. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.314.

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Анотація:
Users consume products all the time, while companies produce products all the time. Product is the fundamental where enterprises have their foothold and product development is the only way to business survival and development. To conduct effective product development, enterprises must have scientific marketing strategy and rational ideas of development. Therefore, to analyze the ideas in product development design from the perspective of product extension in marketing helps expand the vision in product development, define product development objectives and also helps to find the accurate positioning of product design.
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10

Xiang, Jian Hua, Chun Liang Zhang, and Fan Jiang. "Forming Technology of Spiral Micro-Groove in Plane." Advanced Materials Research 328-330 (September 2011): 346–49. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.346.

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Анотація:
A spiral micro-groove structure in plane was processed by P-E method in this paper. The shapes of groove structure was restricted by P-E depth aph and feed f. The influence aph and f on the height of fin and matching relation between aph and f were analyzed, and optimal value of aph and dph was obtained. The highest fin was achieved when dph was the optimal value in processing. Meanwhile, the effect of rotational speed n on the morphology of micro groove was studied.
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11

Doré, X., and M. Rappaz. "Modelling of Microsegregation." Materials Science Forum 329-330 (January 2000): 331–38. http://dx.doi.org/10.4028/www.scientific.net/msf.329-330.331.

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12

Wołczyński, Waldemar, and J. Kloch. "Mass Conservation for Microsegregation and Solute Redistribution in Cellular/Dendritic Solidification with Back-Diffusion." Materials Science Forum 329-330 (January 2000): 345–50. http://dx.doi.org/10.4028/www.scientific.net/msf.329-330.345.

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13

Shirzadi, A. A., and E. R. Wallach. "Analytical Modelling of Solidification during Temperature Gradient TLP Diffusion Bonding." Materials Science Forum 329-330 (January 2000): 351–60. http://dx.doi.org/10.4028/www.scientific.net/msf.329-330.351.

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14

Onsøien, M. I., P. Misic, Øystein Grong, Ø. Gundersen, and A. L. Dons. "Application of a Nodular Iron Microstructure Model for an Industrial Casting." Materials Science Forum 329-330 (January 2000): 361–68. http://dx.doi.org/10.4028/www.scientific.net/msf.329-330.361.

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15

Kloch, J., Bernard Billia, T. Okane, T. Umeda, and Waldemar Wołczyński. "Experimental Verification of the Solute Redistribution in Cellular/Dendritic Solidification of the Al-3.5Li and Fe-4.34Ni Alloys." Materials Science Forum 329-330 (January 2000): 31–36. http://dx.doi.org/10.4028/www.scientific.net/msf.329-330.31.

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16

Manzke, Vitor, and Sérgio Figueiredo. "Uma revisão de literatura sobre a formação musical continuada de professores generalistas." Revista Thema 14, no. 1 (February 23, 2017): 320–30. http://dx.doi.org/10.15536/thema.14.2017.320-330.334.

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17

Chen, Hu, and Jin Dan Zhu. "Creep Life Prediction of T91/12Cr1MoV Dissimilar Welded Joint." Applied Mechanics and Materials 330 (June 2013): 304–9. http://dx.doi.org/10.4028/www.scientific.net/amm.330.304.

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Анотація:
Based on the creep test results of T91/12Cr1MoV dissimilar welded joint at different conditions, the creep curves of this dissimilar welded joint were established by modified θ projection concept. Low stress creep life was predicted by this curve and the established creep curve shows a good agreement with the experimental data. For computation, Larson-Miller parameters method was also used in creep life forecasting of T91/12Cr1MoV dissimilar welded joint. The resu lt showed that the modified θ projection concept was more accurately in predicting the creep life than Larson-Miller parameters method in allusion to T91/12Cr1MoV dissimilar welded joint.
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18

Haider, Farag I., Mohamed A. Gebril, and Salah M. Elkoum. "Evaluation of the Performance of Cylinder Liner under Dry Reciprocating Wear Conditions." Applied Mechanics and Materials 330 (June 2013): 310–14. http://dx.doi.org/10.4028/www.scientific.net/amm.330.310.

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The aim of this work is to study the wear behavior of the cylinder liner of internalcombustion engines, using reciprocating wear testing machine and study the effect of operating conditions (Rotating speed, length of stroke and normal load) on the wear behavior in dry sliding. A statistical analysis method was applied to study the interaction effect of these parameters, and effect of each parameter. Results obtained showed that the wear characteristics is effected mainly by the normal load (P), and stroke length (L), and the rotating speed (R) has no significant effect on the liner wear. The study also showed an interaction effect of normal load (P), and stroke length (L) together on the wear of the liner.
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19

Liu, Xuan Zuo, Hui Min Wang, Yu Long Zhang, Fei Zhang, and Ji Kai Zhou. "Vibration Analysis of the Solar Car Frame." Applied Mechanics and Materials 330 (June 2013): 315–20. http://dx.doi.org/10.4028/www.scientific.net/amm.330.315.

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Анотація:
As a new type of automobile, solar cars lack the data of relevant assemblies. The frame requirements of solar cars are also different from the traditional ones. In this paper, a specific analysis of the vibration characteristics of the solar car's frame has been made, and an improvement is carried out to ensure the comfort and handling stability. It provides a theoretical basis for the study of the solar car.
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Wang, Chun Hui, Wei Yuan, Guang Neng Dong, and Jun Hong Mao. "A Quantitative Model of Wear Loss Based on On-Line Visual Ferrograph." Applied Mechanics and Materials 330 (June 2013): 338–45. http://dx.doi.org/10.4028/www.scientific.net/amm.330.338.

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Анотація:
On-line visual ferrograph (OLVF) is an efficient and real-time condition monitoring device. From the point of flow conservation, on the basis of the particle coverage area data collected by OLVF, this paper deduced two models about wear loss of the tribo-pairs in the wear process, one is general mathematical (GM) model including distribution impact factor of wear particle, and other simplified GM (SGM) model which does not contain the factor. The key factor affecting the accuracy of the two models is the three dimensional information of wear particles referring to particle area and thickness. This model using the disc and the ball whose materials were GCr15 were experimentally demonstrated on a pin-on-disc testing machine. And the OLVF was used to acquire the coverage area of the wear particles, which can reflect the wear loss. It shows that, in some cases, the approximate wear loss in the process was obtained on-line conveniently. Compared with experiment values derived from other wear measurement methods like weighing mass method and surface profilometry method, the SGM model can reflect tendency of wear loss about the tribo-pairs continuously. The deviations about wear loss by the model were discussed. Meanwhile, compared with the traditional means to compute the wear loss, this SGM model could be employed both for off-line analysis and on-line condition monitoring programs.
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21

Wu, Jing Jing, Qi Chang Li, Guang Long Wang, Feng Qi Gao, and Zhong Tao Qiao. "The New Vehicle Condition Monitoring Indicator VPR and its Short-Time Prediction ARMA Model." Applied Mechanics and Materials 330 (June 2013): 350–56. http://dx.doi.org/10.4028/www.scientific.net/amm.330.350.

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Анотація:
The vehicle storage & transportation condition monitoring system focuses on the real time acquisition and processing analyses of life cycle environmental temperature and humidity, shock and vibration stress and the attitude and position information of Vehicle, it is the effective supplement of vehicle equipment maintenance and management. Based on the vehicle storage state information defining a new index early warning rate vehicle predictive rate (VPR), and establish the ARMA forecasting model. The experimental results show that the model can slow the short-term trend fast track prediction to the small capacity samples of the VPR, and that about 12% of high precision. Prediction results help to establish the vehicle equipment maintenance quality management plans for the vehicles those in complex difference transportation environment, and their performance status is not the same.
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He, Cun Fu, Xiao Ming Cai, Shen Yang, Zeng Hua Liu, and Bin Wu. "Truss Structure Health Monitoring Based on Electromechanical Impedance Method." Applied Mechanics and Materials 330 (June 2013): 357–63. http://dx.doi.org/10.4028/www.scientific.net/amm.330.357.

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Анотація:
Truss structure is widely used in civil engineering applications for its advantages of easy transportation, convenient assembly and uniform loading. However, it is difficult to achieve real-time health monitoring because of connection diversity and complexity of truss structures. As a novel structural health monitoring technique, electro-mechanical impedance method could monitor the health state of one structure by measuring the spectra of impedance or admittance of the piezoelectric elements, which are bonded on the surface of this structure. This approach has the advantages of nonparametric model analysis, easy sensor installation and high local sensitivity, especially in sensitive frequency range. The damage information, which is tested and recorded by using electromechanical impedance method, could convert into intuitive results through neural network because of its good ability for nonlinear mapping. In this paper, a three-layer assembly truss structure was chosen as experimental object, piezoelectric elements were bonded on structure joints to measure structural impedance spectra, the change of these structural impedance spectra was tested and recorded under high frequency excitations when different truss bars were loosed, and then, one back-propagation (BP) neural network was built and trained by this damage information, which were treated as input samples. These results show that the sensitivity of impedance method is not the same to different frequency range and trained neural network could quickly identify loosen truss bars.
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23

Liu, Shu Xin, Yun Dong Cao, Chun Guang Hou, Yang Liu, and Xiao Ming Liu. "Development of On-Line Monitoring System and Aging Characteristics Research of Switchgear." Applied Mechanics and Materials 330 (June 2013): 364–67. http://dx.doi.org/10.4028/www.scientific.net/amm.330.364.

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Анотація:
For improving reliable operation of switchgear in power system, an approach for on-line monitoring the insulation characteristic and bus-bar temperature rising of the switchgear is proposed in this paper. Through comparing several existing temperature measurement methods for monitoring temperature rising elevation at bus-bas, a new design of temperature monitoring method is proposed. It adopts quick-magnetic saturated current transformer, temperature sensor and infrared transmission to solve the problem of high voltage isolation. The epoxy resin insulation material which is commonly used in switchgear its aging mechanism data is not complete, seriously restrict on-line monitoring for switchgear, so thousands hours of aging experiment is done on switchgear, systematic study various electrical characteristics variation law on the gradual aging process of epoxy resin insulation materials. Therefore, study on the aging characteristics of switchgearinsulation and its lifetime estimation method is the key technology to understand agingmechanism better, search for new fault diagnostic method and the way to extend theuseful lifetime of switchgear. At last, the system runs in real system and the result shows the on-line monitoring system is stable and reliable which can be provide reference for on-line monitoring system design of switchgear.
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24

Jie, Xia, and Jin Hui. "Research of Sensor Optimization Algorithm for Vibration Monitoring of Crane Structure." Applied Mechanics and Materials 330 (June 2013): 368–72. http://dx.doi.org/10.4028/www.scientific.net/amm.330.368.

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Анотація:
Safety requirements for large crane become more and more rigorous, as the crane is widely used in various fields. The health monitoring technology of cranes can provide early warning and the location of damage for a long time. It has great significance that people can monitor the crane operation in real time. Thronging establishing three-dimensional simulation model, an optimization algorithm on sensor used in crane structure is introduced in this paper, which is based on algorithm of QR decomposition and Modal Assurance Criterion. Character of structure in space is considered in research. The modals of displacement were chosen on the foundation of structure vibration characteristics in different direction, so that sensor layout could not be affected by vibration characteristics of simplified modal. Under the guidance of optimization algorithm selected above, the research shows that sensor layout would be affected by optimization algorithm and modals of displacement. By choosing Structure mode shape which can reflect the real structure, study indicates that well project of sensor layout can be well provided on the basis of algorithm of QR decomposition and Modal Assurance Criterion.
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Qiu, Zi Xue, Zhi Xin Chen, Jiang Yuan, You Wei Wang, Jie Yang, and Yun Lei Yu. "Design of Sensor-Tag Using Radio Frequency Power to Energize and its Research on Structural Health Monitoring." Applied Mechanics and Materials 330 (June 2013): 373–79. http://dx.doi.org/10.4028/www.scientific.net/amm.330.373.

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Анотація:
A new method of structural health monitoring based on sensor-tags using radio frequency power to energize node wirelessly is proposed. A modular RFID sensor-tag, which has the function of signal conditioning, energy harvesting, and wireless transmission, is designed for some sensing elements commonly used in structural health monitoring, such as resistance strain gauges, piezoelectric ceramic and shape memory alloy (SMA). Sensor-tags receive energy which is the feedback of reader antenna coupling and provide power for sensor nodes. It overcomes defects of wireless sensor network (WSN) powered by battery, such as weak capabilities of processing, storage and communication. Stretching, bending and impact tests show that the system can achieve reliable signal acquisition and wireless transmission, the wireless communication distance between tag and reader is up to 128 meters, bit error rate of signal transmission 2 %.
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26

Xu, Bin, Zhong Jian Yu, and En Pin Liu. "Safety Inspection of an Overhead Crane Based on Virtual Simulation." Applied Mechanics and Materials 330 (June 2013): 380–82. http://dx.doi.org/10.4028/www.scientific.net/amm.330.380.

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Анотація:
Safety inspection was playing a very important role in controlling accidents of overhead cranes, especially under the modification case. During a modification of a crane, strength evaluation was a necessary step. Experimental stress analysis and theoretical calculation were traditionally applied in rerating the strength, but it cost lots of time and resources. Virtual simulation was an alternative method, and in this investigation finite element method was adopted. The three dimension models of bridge and trolley were built while the rated load was changed to the modification case, and then stress-strain analysis was performed. In order to validate the results of virtual simulations, practical load tests were carried out in accordance with the virtual simulations. By comparison, it indicated that the results of virtual simulations were precise, and finite element method could be applied in safety inspection instead of practical load tests.
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27

Liu, Ma Bao, Bin Bin Li, Jiang Tao Li, and Yuan Yuan Lian. "Smart Coating Sensor Applied in Crack Detection for Aircraft." Applied Mechanics and Materials 330 (June 2013): 383–88. http://dx.doi.org/10.4028/www.scientific.net/amm.330.383.

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Анотація:
Monitoring fatigue cracking of large engineering structures is a costly and time-intensive process. The authors present a low-cost smart coating sensor (SCS) consisted of driving layer, sensing layer and protective layer typically that can detect crack initiation and growth. The results show that the smart coating sensor can detect cracks above 300μm, corresponding to the increment of the sensing layer’s electric resistance at the level of 0.05Ω. Therefore, the development of SCS is of importance significance in the substitution of an existed inspection that requires substantial disassembly and surface preparation, and, thus, can find numerous applications in difficult-to-access locations on aircrafts.
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28

Yang, Cai Qian, Ye Fei Xia, Zi Yan Chen, Wan Hong, and Zhi Shen Wu. "Study on the Structural Deformation Monitoring Based on Distributed FBG Sensing Techniques." Applied Mechanics and Materials 330 (June 2013): 389–95. http://dx.doi.org/10.4028/www.scientific.net/amm.330.389.

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Анотація:
The deformation is an important parameter in structural health monitoring, and a conjugate beam method based on long-gauge fiber Bragg grating distributed strain sensing techniques is proposed to obtain the deformation of a structure. Some experiments are carried out to study the accuracy of this method using a four point bending RC beam under a step loading manner. The deformation obtained with the proposed method agrees well with those obtained with the conventional dial gauge in low loading steps. In addition, some measure is put forward to calibrate the proposed method and improve its accuracy at high loading steps, especially after the initiation of concrete cracks.
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29

Zhao, Na, and Ke Qin Ding. "Fiber Optic Acoustic Emission Sensor System for Local Damage Detection." Applied Mechanics and Materials 330 (June 2013): 396–400. http://dx.doi.org/10.4028/www.scientific.net/amm.330.396.

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Анотація:
The crack is easily generated in the metal structure because of fatigue. It has a strong impact on structural safety. To reduce accident and losses, it is important to detect the local damage such as active crack. The general method to detect the local damage is acoustic-emission technique. But it has the disadvantages of short distance transmission, interfered easily and so on. In this paper, the fiber optic acoustic emission sensor system is designed and developed. A lot of experiments have been done in laboratory. It is shown that the new system has long distance transmission, and has high anti-interference etc. It can meet the demand of local damage detection about the metal structure.
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30

Калентьев, А. А., А. А. Попов, Д. В. Билевич, И. М. Добуш, А. Е. Горяинов та Т. Н. Файль. "АЛГОРИТМ АВТОМАТИЧЕСКОГО ПОСТРОЕНИЯ МАЛОСИГНАЛЬНОЙ МОДЕЛИ GAAS PHEMT- ТРАНЗИСТОРА И ЕГО РЕАЛИЗАЦИЯ В САПР". NANOINDUSTRY Russia 96, № 3s (15 червня 2020): 330–36. http://dx.doi.org/10.22184/1993-8578.2020.13.3s.330.336.

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Анотація:
Показаны результаты разработки алгоритма построения малосигнальной модели GaAs pHEMT-транзистора. Алгоритм реализован в виде плагина для САПР СВЧ-устройств NI AWR Design Environment. Алгоритм представляет собой комбинацию различных методик построения малосигнальных моделей. Он позволяет получить модели СВЧ-транзисторов в автоматическом режиме непосредственно в САПР. Экспериментальные исследования показали хорошее совпадение модели, полученной прямой экстракцией, с результатами измерений. The paper highlights the results of developing a GaAs pHEMT small-signal modeling algorithm. The algorithm has been implemented in the microwave EDA NI AWR Design Environment. The algorithm is a combination of the different techniques for small-signal model extraction. It allows automatically getting the microwave transistor model directly in the EDA. Experimental studies have shown a good agreement between directly extracted model and measurements results.
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31

Исаев, А. А., А. В. Бурмистров, А. А. Райков та С. И. Саликеев. "МЕТОД РАСЧЕТА ОТКАЧНЫХ ХАРАКТЕРИСТИК ДВН ТИПА РУТС, РАБОТАЮЩИХ ПРИ ПОВЫШЕННЫХ ДАВЛЕНИЯХ (ВЯЗКОСТНЫЙ РЕЖИМ ТЕЧЕНИЯ ГАЗА В ЗАЗОРАХ)". Nanoindustry Russia 14, № 6s (15 березня 2021): 330–37. http://dx.doi.org/10.22184/1993-8578.2021.14.6s.330.337.

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Анотація:
Рассматривается метод расчета откачных характеристик двухроторного вакуумного насоса типа Рутс, основанного на уравнениях состояния и сохранения энергии, записанных в дифференциальной форме. Проведена верификация разработанной математической модели путем сопоставления результатов расчета с экспериментальными данными, полученными для насоса ДВН-50 при работе на разных частотах вращения и в агрегате с различными форвакуумными насосами. Показано, что для обеспечения лучшей сходимости расчета и эксперимента необходимо провести дополнительные исследования потерь, возникающих при заполнении отсеченных объемов.
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32

HE, JIAN, QINGGUO ZHANG, and GANG LIU. "THE PHOTON ESCAPE PROBABILITY OF Na 330.3 nm RESONANCE LINE." International Journal of Modern Physics B 24, no. 29 (November 20, 2010): 5703–9. http://dx.doi.org/10.1142/s0217979210057390.

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Анотація:
In this paper, the photon escape probability of Na 330.3 nm resonance line is calculated, both for slab and cylindrical geometries. The dependence of the photon escape probability on the optical depth in the line center is considered. The oscillator strength, the number density of the absorbing atoms in the ground state, and the optical depth in the line center are discussed in this calculation. The changes of the photon escape probabilities with different concentrations are calculated. This calculation will provide a method to calculate the photon escape probability for different lines.
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33

Li, Rong, Hu Li Shi, and Zhi Ping Chen. "Study on Thermal Analysis of Main Mirror in Space Solar Telescope." Advanced Materials Research 328-330 (September 2011): 300–304. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.300.

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Анотація:
The proposed Chinese Space Solar Telescope (SST) is the first large aperture space telescope in China designed to observe the sun. With an effective aperture of Φ1m, the primary mirror faces the sun directly, which receives more than 1000W heat that will lead to unacceptable thermal distortion in such severe thermal condition. Therefore, the temperature field of SST, which is changing with its orbital position, is critical in its design. In this paper, an analysis of the thermal flux in the SST is presented firstly. Further more, the heat flux of orbit is calculated with the thermal softerware NEVADA (Net Energy Verification And Determination Analyzer) according to the orbit parameters of SST. The thermal design software SINDA/G (System Improved Numerical Differencing Analyzer/Gaski), the radiation analysis software NEVADA and the finite element analysis software MSC.Patran are used to simulate the temperature field of the SST. In the end, the temperature distribution of the primary mirror is calculated. The temperature level of the primary mirror indicates that the system can achieve high spatial resolution with 0.1″~0.15″. It also means that the thermal control design is effective. The optical requirements to the SST thermal control are met. The thoughts and methods of the thermal analysis are also useful for similar optical telescopes designed for solar observation.
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34

Yu, Ping, Zhi Hui Xiao, Yao Hua Wang, and Dong Yu Liu. "The Dynamic Simulation of Vibration Process of the Top Drive System of the JDD-100 Type Drilling Rig Based on ADAMS." Advanced Materials Research 328-330 (September 2011): 305–8. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.305.

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Анотація:
We studied the high frequency vibrator of the top drive system based on ADAMS. A parameterized simulation model of the axial rotation of gears and eccentric block is established, and dynamic change of the impact and the actual movement of the rotating components of the top drive system are analyzed. Then create a virtual prototype on the basis of that. It can obtain curves that some parameters change relative to time, such as the exciting force and the centroid position of eccentric block. Thus it achieves dynamic simulation analysis of virtual prototype of the top drive system.
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35

Wu, Tian Yue, Wen Qiang Li, and Yan Li. "Innovative Design of an Automatic Train Picking Hook Device Based on TRIZ." Advanced Materials Research 328-330 (September 2011): 309–13. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.309.

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Анотація:
TRIZ theory is employed to design an automatic picking hook device on the dumper unloading line in thermal power plant. First and foremost, engineering parameters is listed to establish TRIZ model of practical problem, then relevant solving inventive principles is found by using conflict matrix, finally an innovative design is made and an automatic picking hook device is being initially proposed in this issue. This device can reduce not only the online failure rate, but also the labor intensity and operation difficulty.
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36

Li, Shuang Mei. "Theoretical Study on the Microwave Assisted Reversal of Magnetic Moment for Graining." Advanced Materials Research 328-330 (September 2011): 318–21. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.318.

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Анотація:
This paper presents the dynamic precession of the moments of the grains based on LL equation, and the impact of the interaction between the grains on the minimum switching field threshold and the speed of the switching process in the microwave field is investigated.As an isolate grain, microwave assisted switching could enhance minimum switching field threshold and switching speed.
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37

Guo, Lian Zhong, Ding Yang, Xing Rui Chen, and Zi Teng Huang. "Layout Optimization of Support Structure Based on ANSYS." Advanced Materials Research 328-330 (September 2011): 322–26. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.322.

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Анотація:
This work is to present layout optimization of support structure based on ANSYS with stress constraint. Currently size, shape and topology optimization have been well studied, but layout optimization is still in the early stage and its application is limited by its massive mathematical model. In this paper the problem of numerical calculation is solved by the optimization algorithms of ANSYS and then through studying the mathematical model, sensitivity, controlling parameters and optimization criteria of it a toolkit is designed and programmed by C# language. At last, an optimization case is studied and the results show that more reasonable design prototypes can be found for engineers through using the toolkit especially in the conceptual design stage.
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38

Li, Zhong Gen, and Guo Yi Zhou. "Numerical Simulation of Three-Dimensional Temperature Distribution in the Supercharged Boiler Furnace." Advanced Materials Research 328-330 (September 2011): 327–31. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.327.

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Анотація:
In this paper, the visualization of three-dimensional (3-D) temperature distributions in the supercharged boiler furnaces from radiative energy images captured by multiple charge-coupled device (CCD) cameras mounted around the furnace is studied numerically for the first time. The combustion of supercharged boiler is analyzed by structuring a full-scaled model and grid partition. The calculation of the radiative energy image formation is a fast algorithm based on the Monte Carlo method and the two-color temperature calculation method. For the inversion of the 3-D temperature distributions, a modifiedregularization method is used. The simulation results show that: even though the measurement error of the radiative energy images for the 3-D temperature distributions up to 0.12, the position of the reconstruction high-temperature zone is almost the same to the one of the simulation. The results indicate that the reconstruction quality is satisfactory, and the method can lead to a good visualization result.
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39

Wang, Ming Hai, Xiao Peng Li, Lei Sun, and Yue Sun. "The Effect of Normal Curvature of the Free Surface on the Cutting Width." Advanced Materials Research 328-330 (September 2011): 332–35. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.332.

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Анотація:
This paper analyzes the influence of processing surface curvature of the free surface to the cutting width to improve the cutting width of free surface. The results show that this analysis is feasible to improve the process if the machining accuracy allows. It shows that the curvature of the machined surface and the curvature of the cutting tools have a great impact on the cutting width if they are matched reasonable. Therefore, analyzing the curvature of the surface of the surface of free-form surface machining can improve the cutting width effectively.
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40

Lan, Guo Sheng, Xue Liang Zhang, Hong Qin Ding, Shu Hua Wen, and Zhong Yang Zhang. "Analysis and Research on Fractal Model of Normal Contact Stiffness of Joint Interfaces." Advanced Materials Research 328-330 (September 2011): 336–45. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.336.

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Анотація:
Through the analysis and research on three fractal models of normal contact stiffness of joint interfaces, the differences between them can be found. Furthermore, numerical simulation was carried out to obtain the complicated nonlinear relations between normal contact stiffness and the normal load. The results show that the normal contact stiffness increases with the normal load, decreases with G but complicatedly varies with D. According to different fractal dimension, we can chose an appropriate one among the three fractal models of normal contact stiffness of joint interfaces when describing normal contact stiffness of joint interfaces.
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41

Zhou, Zhi Hao, Qi Lin Zhang, Hui Zhu Yang, and Lu Chen. "Development of Structural Health Monitoring Software System of Shanghai Center Tower." Advanced Materials Research 328-330 (September 2011): 350–53. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.350.

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Анотація:
Shanghai Center Tower is the tallest skyscraper under construction in China with the height of 642 meters. In order to reflect the real structural status of Shanghai Center Tower during the construction period and running period in three dimensional graphics, a Structural Health Monitoring Software System (SHMSS) is developed. The CAE software system consists of three function modules such as Modeling module, Data Management module, Post-Processing module. The Modeling module could build a 3D model confirming to the real Shanghai Center Tower based on the Building Information Modeling (BIM) concept; the Data Management module could access the engineering data produced by the sensors; then in the Post -Processing module, various data about the Shanghai Center Tower could be processed and structural parameters such as member force, displacement, wind pressure would be displayed in the 3D model.
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42

Huang, Shi Biao. "Innovative Design and Simulation for a Novel Vane Pump." Advanced Materials Research 328-330 (September 2011): 354–59. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.354.

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Анотація:
A novel structure of vane pump is brought forward, a new assembly relation among vane, sleeve, port plate and stator is created, mechanical bearing condition of new-type vane is preferable than traditional vane, vane is kept clearance with stator all the time as long as dimensions of those parts are reasonable. Modal analysis and optimized design for vane is made with finite element analysis software ANSYS. By simulating analysis for pump, simulation result shows that this novel vane pump is feasible. Compared with traditional pump, wear and vibration of novel vane pump can be reduced, volumetric efficiency of pump can be enhanced remarkably, the novel vane pump has certain application value.
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43

Ren, Ai Hua, Guo Xing Sun, and Chuan Qiong Sun. "Solid Modeling of Spatial Cam with Oscillation Roller Follower." Advanced Materials Research 328-330 (September 2011): 360–63. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.360.

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Анотація:
Though spatial cam has been widely used in various fields of machinery and equipment ,but it is seldom used in continuously variable transmission situation. So firstly the working principle of spatial cam for CVT is introduced, and then equations of the pitch curve and cam contour are derived .In order to get the required dimensions and parameters of spatial cam during three dimensional modeling, program is developed with programming software Mathcad and the corresponding programming flow chart is listed out. And the running results of the Mathcad program and features of spatial cam in Pro/E are correlated to realize solid modeling, at last an example is given to demonstrate the feasibility and flexiblity of this method.
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44

Ruan, Liang, Xu Dong Ren, Yong Zhuo Huangfu, and Yong Kang Zhang. "Effects of Laser Multiple Processing on Properties of Heat-Resistant Steel." Advanced Materials Research 328-330 (September 2011): 364–67. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.364.

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Анотація:
The heat-resistant steel after aluminized was treated by laser shock processing (LSP) with high power Nd:YAG laser, and then was tensile tested at 400°C. The effects of the high-temperature behavior after LSP were analyzed from residual stress and fracture organization. The results showed that the yield strength and tensile strength of heat-resistant steel after aluminized were improved obviously during the tensile testing at high temperature, and the High-temperature fatigue life of 00Cr12 with composite processing was enhanced vastly. Compared with the LSP, the High-temperature fatigue life of 00Cr12 heat-resistant steel by aluminizing and LSP had a larger increase.
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45

Dai, Li Xin, and Zong Li. "Study on Application of Critical Path to Project Time Management." Advanced Materials Research 328-330 (September 2011): 368–71. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.368.

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Анотація:
Most resources used in a project will have an easily determined cost. We need to know which staff members can work on which parts of a project and what needs to be done, and when. Project time management should be broken down, step by step, just as other parts of the project are broken down in the planning phase. This will help make sure that everything is done when it needs to be, and to keep the project from going over its budget because it went well past the time scheduled for it. A project manager often need to control the whole time of the project and grasp the key process in those tasks which can shorten the period and reduce the cost. This paper discusses the algorithm of AOE-net in the critical path and its application to evaluate the completion time in the network planning of project time management.
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46

Wang, He Tang, De Ming Wang, and Wan Xing Ren. "A New Technique for Preparation of Two-Phase Foam Materials for Controlling Mine Dust and its Application." Advanced Materials Research 328-330 (September 2011): 372–75. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.372.

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Анотація:
In order to overcvome the shortage of current dust control technology in coal mine, especially the traditional water spray method, a two-phase foam materials preparation experimental system was established based on the simulation of water and air conditions in underground coal mine. And a new technique which can prepare high-performance foam was proposed, and the main technical parameters and application conditions to implement foam dedusting were determined through plenty of experimental. Then, the new technique had been applied in two large underground coal mine. The results show that its dedusting efficiency to total dust and respirable dust reached 90.5% and 85.4% in the fully-mechanized excavated face, as 1.97 times and 1.88 times higher than water spray respectively. However, its water consumption is only as 10% to 20% as conventional water spray. It is proved that this new technique for preparation of foam can reduce mine dust concentration remarkably and improved the working environment obviously, and has a broad application prospect and promotion value to control dust in underground coal mines and other related industry.
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47

Huangfu, Yong Zhuo, Xu Dong Ren, Liang Ruan, Yong Kang Zhang, and Da Wei Jiang. "Effects of Laser Shock Processing on Fatigue Lives of Heat-Resistant Steel and Estimation of Fatigue Safe Lives." Advanced Materials Research 328-330 (September 2011): 376–79. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.376.

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Анотація:
Fatigue tensile treatment was performed on 00Cr12 heat-resistant steel specimens which had been treated by laser shock processing (LSP). The unilateral tolerance factor statistical analysis method and the two-dimensional Weibull distribution method were used to predict the values of fatigue safe lives of the specimens respectively. The results indicate that the fatigue lives of 00Cr12 specimens were enhanced greatly after LSP, and improved by 62% compared with the specimens which were not treated by LSP. The unilateral tolerance factor method obtained an exact estimation value of the fatigue safe life; while the two-dimensional Weibull distribution method can get a range of values of fatigue safe lives, the fatigue safe lives of the specimens which after LSP were a range from 116570 to 150230, the average value was 132330. The two-dimensional Weibull distribution method has more engineering applicability and can be used to estimate the fatigue safe lives with fewer experiments.
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48

Liu, Ping, and Hui Yi Miao. "Mathematical Model for Evaluating Roundness Errors by Minimum Circumscribed Circle Method." Advanced Materials Research 328-330 (September 2011): 380–83. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.380.

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Анотація:
An unconstrained optimization model is established for assessing roundness errors by the minimum circumscribed circle method based on radial deviation measurement. The properties of the objective function in the optimization model are thoroughly researched. On the basis of the modern theory on convex functions, it is strictly proved that the objective function is a continuous and non-differentiable and convex function defined on the two-dimensional Euclidean space. The minimal value of the objective function is unique and any of its minimal point must be its global minimal point. Any existing optimization algorithm, so long as it is convergent, can be used to solve the objective function in order to get the wanted roundness errors by the minimun circumscribed circle assessment. One example is given to verify the theoretical results presented.
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49

Zhang, Ming Zhu, and Qiang Wang. "Invention of Nano-Material Synthesis Process Equipment via Vapor-Phase Technics." Advanced Materials Research 328-330 (September 2011): 384–87. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.384.

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Анотація:
This paper mainly introduces the principle of preparation for nano-materials via vapor-phase technics, the design and assembly of nano-material synthesizer. Vapor-phase techniques include physical and chemical vapor synthesis, which involves vapor particle nucleation, nuclei growth, cohesion and a series of basic process in particle growth. Based on the principle of vapor-phase, this paper also details the invention of the process equipment for nano-material synthesis, which realizes an adjustable process in automatic control. The design aims to achieve a synthesizer being adjustable, automatic, intuitive and easy to operate. It mainly includes the following features. First, the invention helps show that preparation for nano-materials via vapor-phase technics is feasible. Second, with the high output of vapor-phase reaction, the synthesizer can not only be carried out in the experimental environment to demonstrate the synthesis of nano-materials, but also be applied in industrial production.
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50

Chen, Dong Liang, Qun Zhang, and Shao Zhi Liu. "Design and Realization of a Flexible Claw of Rough Wall Climbing Robot." Advanced Materials Research 328-330 (September 2011): 388–92. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.388.

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Анотація:
Based on the research of foot characteristics of insecta, a climbing robot’s mechanical structure and kinematics are analyzed, and the main crawling institutions was designed by a kind of bionic four-bar linkage. Claws are made of sharp spines, claws are composed of a number of toes which are flexible structure with local degrees of freedom, they have a grate adaptivity to the rough wall. We have studied the characteristics of the rough wall climbing, and made analysis affection of reliability with the angle perched on. The experimental study indicates spine planning and structure design, material selection are reasonable.
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