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The Activities of Georgius Kruger, Secretary of the Astronomer Johannes Hevelius, in Courland
No full textAbout work of the secretary of astronomer Johannes Hevelius Georgius Kruger in Courland from 1679 untill 1707
Design Principles for Higher Harmonics Multiple Frequency Reluctance Pickups in Electrical Drive
No full textThere is developed a classification of variable reluctance pickups of multiple frequencies in the given paper. The principles of their construction illustrated by an equivalent circuit are presented and summarized. General recommendations for the choice of basic parameters of such a pickup construction are presented in terms of the most general of the principles described in accordance with specifications of the electric drive
Mathematical Model Development for Electrochemical Disinfection Efficiency Prediction
No full textUsing found equations allows water disinfection process prediction and management. Obtained equations is valid within a certain set of chosen parameters (applied current strength 0.1 – 0.4 A, chloride ions concentration 0~250 mg/L, productivity may vary from 0.055 L/min until 0.280 L/min, and sulfate ions concentration is 24 – 250 mg/L)
Моделирование и микропроцессорное управление электроприводами: лабораторные работы
No full textЛабораторные работы содержат основы аналогового и цифрового моделирования электроприводов, а также введение в микропроцессорное управление на базе микропроцессорных устройств серии КР 58
Automātiskā elektriskā piedziņa: lekciju konspekts
No full textAutomātiskās elektriskās piedziņas kurss ir elektroapgādes (0303), elektrisko mašīnu un aparātu (0601) un automātikas un telemātikas (0606) apecialitāšu nozīmīga disciplīna. Šī kursa apguve palīdz izprast sakarības starp atsevišķām profilējošām disciplīnām. Grāmata kopumā aptver elektriskās piedziņas pamatus, elektriskās piedziņas automātisko vadību un elektriskās piedziņas komplekso automatizāciju. Vielas izklāsts ir maksimāli konspektīvs. Grāmata ir lekciju konspekts automātiskās elektriskās piedziņas kursa apgūšanai
2D and 3D Surface Characterization of the Tribological Powder Parts
No full textThe brief review of Powder Metallurgy state and development is given. The 2D and 3D surface characterization of the iron-copper powder parts is offered. The experimental and theoretical results of the influence of the 3D surface roughness parameters of powder iron-copper details on the wear intensity are offered. It is shown that the highest linear wear intensity is achieved for iron-copper powder details after infiltration, i.e. after final stage of production. Nevertheless achieved results show the possibility of successful using of such details for different application in industry
The Application of Laser Cladding to Mechanical Component Repair, Renovation and Regeneration
No full textThanks to shifting social paradigms and economic pressure, the repair and refurbishment sector of production engineering is currently booming. This chapter describes laser cladding technology, which is being increasingly applied in the repair and reconditioning of all kinds of mechanical components. We have sought here to describe the use of laser cladding technology and its basic principles. Its comparative advantages over other build-up technologies include better overall quality of coating, minimal dilution and distortion and customised surface parameters. The methods for applying additive material to the repaired surface are detailed, together with the three main types of lasers.
The current stage of laser cladding technology implementation and trends for its industrial application are outlined with emphasis to the repair sector, including relevant equipment and powder delivery nozzles. An illustrative case study is included in the chapter to demonstrate how laser cladding could be effectively applied to in-situ marine crankshaft repairs. This includes an assessment of previous studies in the field, the sampling of laser-cladding machine designs and lessons learned. It is then possible to evaluate the advantages and disadvantages of laser cladding. Here we have defined the challenges to be addressed and summarized the emerging overall trends of this technology. It is noted that laser cladding is only in its early stages of implementation and commercialization. Finally we offer a brief overview of the relevant issues to be considered by engineering educators and policy makers
{(3aR,5S,6R,6aR )-5-[(R )-1,2-Dihydroxyethyl]-2,2-dimethyltetrahydrofuro[ 2,3-d ][1,3]dioxol-6-yl}methyl methanesulfonate
No full textSynthesis and X-ray Studies of {(3aR,5S,6R,6aR )-5-[(R )-1,2-Dihydroxyethyl]-2,2-dimethyltetrahydrofuro[ 2,3-d ][1,3]dioxol-6-yl}methyl methanesulfonat