87 research outputs found

    Π­ΠΊΡΠΏΠ΅Ρ€ΠΈΠΌΠ΅Π½Ρ‚Π°Π»ΡŒΠ½Π°Ρ ΠΈ аналитичСская ΠΎΡ†Π΅Π½ΠΊΠ° ΠΏΠ΅Ρ€Π΅Π΄Π°Ρ‚ΠΎΡ‡Π½Ρ‹Ρ… свойств мСталличСской Ρ€Π΅ΡˆΠ΅Ρ‚ΠΊΠΈ ΠΌΠΈΠ»Π»ΠΈΠΌΠ΅Ρ‚Ρ€ΠΎΠ²ΠΎΠ³ΠΎ Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π°

    Get PDF
    Metal gratings (MGs) with rectangular lamels based on the technology of jet etching of thin metal plates are widely used in different polarization devices of microwave and terahertz engineering. Numerical methods of mathematical modeling or direct measurements are employed for their analysis. Sometimes in case of H-polarization, analytical approaches for evaluation of transmission characteristics of such gratings can be taken. However, the accuracy of the most of proposed similar models depends essentially upon sizes and frequency ranges. The present article provides both theoretical and experimental research of transmission characteristics of MG with fixed size illuminated by plane electromagnetic wave with H-polarization. Two analytical models are utilized for preliminary evaluation of MG parameters. One of them determines the top limit of T(f) variations, where T is transmittance and f is frequency. The other model determines the bottom limit. The given models were implemented in assumption of small reflections in microwave network. MG size defines one of the restrictions on their application.Для расчСта ΠΏΠ΅Ρ€Π΅Π΄Π°Ρ‚ΠΎΡ‡Π½Ρ‹Ρ… характСристик мСталличСских Ρ€Π΅ΡˆΠ΅Ρ‚ΠΎΠΊ с ΠΏΡ€ΡΠΌΠΎΡƒΠ³ΠΎΠ»ΡŒΠ½Ρ‹ΠΌΠΈ ΠΏΠ΅Ρ€Π΅ΠΌΡ‹Ρ‡ΠΊΠ°ΠΌΠΈ ΠΏΡ€Π΅Π΄Π»ΠΎΠΆΠ΅Π½Ρ‹ Π΄Π²Π΅ аналитичСскиС ΠΌΠΎΠ΄Π΅Π»ΠΈ, Π±Π°Π·ΠΈΡ€ΡƒΡŽΡ‰ΠΈΠ΅ΡΡ Π½Π° Ρ‚Π΅ΠΎΡ€ΠΈΠΈ распространСния элСктромагнитных Π²ΠΎΠ»Π½ Π² ΠΌΠΈΠΊΡ€ΠΎΠ²ΠΎΠ»Π½ΠΎΠ²Ρ‹Ρ… ΠΌΠ½ΠΎΠ³ΠΎΠΏΠΎΠ»ΡŽΡΠ½ΠΈΠΊΠ°Ρ… с нСоднородностями. Π Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Ρ‹ тСорСтичСских расчСтов Π² Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ 110...170 Π“Π“Ρ† ΡΡ€Π°Π²Π½ΠΈΠ²Π°ΡŽΡ‚ΡΡ с Π΄Π°Π½Π½Ρ‹ΠΌΠΈ ΡΠΊΡΠΏΠ΅Ρ€ΠΈΠΌΠ΅Π½Ρ‚Π°Π»ΡŒΠ½Ρ‹Ρ… исслСдований ΡΡ‚Π°Π»ΡŒΠ½ΠΎΠΉ Ρ€Π΅ΡˆΠ΅Ρ‚ΠΊΠΈ с ΠΏΠ΅Ρ€ΠΈΠΎΠ΄ΠΎΠΌ 100 ΠΌΠΊΠΌ

    A New Option for a Search for Alpha Variation: Narrow Transitions with Enhanced Sensitivity

    Full text link
    We consider several transitions between narrow lines that have an enhanced sensitivity to a possible variation of the fine structure constant, alpha. This enhancement may allow a search to be performed with an effective suppression of the systematic sources of uncertainty that are unavoidable in conventional high-resolution spectroscopic measurements. In the future this may provide the strongest laboratory constraints on alpha variation

    Π Π°Π·Π΄Π΅Π»Π΅Π½ΠΈΠ΅ Π³Π°Π·ΠΎΠΏΡ‹Π»Π΅Π²ΠΎΠ³ΠΎ ΠΏΠΎΡ‚ΠΎΠΊΠ° Π² Ρ†Π΅Π½Ρ‚Ρ€ΠΎΠ±Π΅ΠΆΠ½ΠΎ-ΠΈΠ½Π΅Ρ€Ρ†ΠΈΠΎΠ½Π½ΠΎΠΌ ΠΏΡ‹Π»Π΅ΡƒΠ»ΠΎΠ²ΠΈΡ‚Π΅Π»Π΅ с ΠΏΠΎΠ·ΠΈΡ†ΠΈΠΉ эколого-экономичСского ΠΏΠΎΠ΄Ρ…ΠΎΠ΄Π°

    Get PDF
    A methodology of designing an ecological-economic high-performance centrifugal inertial dust catcher-classifier is proposed allowing a description of the separation of solid particles from an air flow. The particles enter the separation zone - a space where their separation from the air flow occurs.ΠŸΡ€Π΅Π΄Π»ΠΎΠΆΠ΅Π½Ρ‹ мСтодичСскиС ΠΏΡ€ΠΈΠ½Ρ†ΠΈΠΏΡ‹ описания процСсса сСпарации (выдСлСния) Ρ‚Π²Π΅Ρ€Π΄Ρ‹Ρ… частиц ΠΈΠ· Π²ΠΎΠ·Π΄ΡƒΡˆΠ½ΠΎΠ³ΠΎ ΠΏΠΎΡ‚ΠΎΠΊΠ°, ΠΏΠΎΡΡ‚ΡƒΠΏΠ°ΡŽΡ‰ΠΈΡ… Π² Π·ΠΎΠ½Ρƒ раздСлСния - пространство, Π² ΠΊΠΎΡ‚ΠΎΡ€ΠΎΠΌ происходит ΠΎΡ‚Π΄Π΅Π»Π΅Π½ΠΈΠ΅ Ρ‚Π²Π΅Ρ€Π΄Ρ‹Ρ… частиц ΠΎΡ‚ Π²ΠΎΠ·Π΄ΡƒΡˆΠ½ΠΎΠ³ΠΎ ΠΏΠΎΡ‚ΠΎΠΊΠ° с Ρ†Π΅Π»ΡŒΡŽ Ρ€Π°Π·Ρ€Π°Π±ΠΎΡ‚ΠΊΠΈ конструкции высокоэффСктивного с ΠΏΠΎΠ·ΠΈΡ†ΠΈΠΉ эколого-экономичСского ΠΏΠΎΠ΄Ρ…ΠΎΠ΄Π° Ρ†Π΅Π½Ρ‚Ρ€ΠΎΠ±Π΅ΠΆΠ½ΠΎ-ΠΈΠ½Π΅Ρ€Ρ†ΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ пылСуловитСля-классификатора

    Optical Clocks in Space

    Get PDF
    The performance of optical clocks has strongly progressed in recent years, and accuracies and instabilities of 1 part in 10^18 are expected in the near future. The operation of optical clocks in space provides new scientific and technological opportunities. In particular, an earth-orbiting satellite containing an ensemble of optical clocks would allow a precision measurement of the gravitational redshift, navigation with improved precision, mapping of the earth's gravitational potential by relativistic geodesy, and comparisons between ground clocks.Comment: Proc. III International Conference on Particle and Fundamental Physics in Space (SpacePart06), Beijing 19 - 21 April 2006, to appear in Nucl. Phys.

    Active laser frequency stabilization using neutral praseodymium (Pr)

    Full text link
    We present a new possibility for the active frequency stabilization of a laser using transitions in neutral praseodymium. Because of its five outer electrons, this element shows a high density of energy levels leading to an extremely line-rich excitation spectrum with more than 25000 known spectral lines ranging from the UV to the infrared. We demonstrate the active frequency stabilization of a diode laser on several praseodymium lines between 1105 and 1123 nm. The excitation signals were recorded in a hollow cathode lamp and observed via laser-induced fluorescence. These signals are strong enough to lock the diode laser onto most of the lines by using standard laser locking techniques. In this way, the frequency drifts of the unlocked laser of more than 30 MHz/h were eliminated and the laser frequency stabilized to within 1.4(1) MHz for averaging times >0.2 s. Frequency quadrupling the stabilized diode laser can produce frequency-stable UV-light in the range from 276 to 281 nm. In particular, using a strong hyperfine component of the praseodymium excitation line E = 16 502.616_7/2 cm^-1 -> E' = 25 442.742_9/2 cm^-1 at lambda = 1118.5397(4) nm makes it possible - after frequency quadruplication - to produce laser radiation at lambda/4 = 279.6349(1) nm, which can be used to excite the D2 line in Mg^+.Comment: 10 pages, 14 figure

    Ultra-precise measurement of optical frequency ratios

    Full text link
    We developed a novel technique for frequency measurement and synthesis, based on the operation of a femtosecond comb generator as transfer oscillator. The technique can be used to measure frequency ratios of any optical signals throughout the visible and near-infrared part of the spectrum. Relative uncertainties of 10βˆ’1810^{-18} for averaging times of 100 s are possible. Using a Nd:YAG laser in combination with a nonlinear crystal we measured the frequency ratio of the second harmonic Ξ½SH\nu_{SH} at 532 nm to the fundamental Ξ½0\nu_0 at 1064 nm, Ξ½SH/Ξ½0=2.000000000000000001Γ—(1Β±7Γ—10βˆ’19)\nu_{SH}/\nu_0 = 2.000 000 000 000 000 001 \times (1 \pm 7 \times 10^{-19}).Comment: 4 pages, 4 figure

    Π˜Π½Ρ‚Π΅Π³Ρ€ΠΈΡ€ΠΎΠ²Π°Π½Π½Π°Ρ Ρ€Π΅ΡΡƒΡ€ΡΠΎΡΠ±Π΅Ρ€Π΅Π³Π°ΡŽΡ‰Π°Ρ систСма водопотрСблСния ΠΈ водоотвСдСния ΡΡ‚Π΅ΠΊΠΎΠ»ΡŒΠ½ΠΎΠ³ΠΎ производства

    Get PDF
    The methodology of designing of water resource-saving chemical process of glass works has been proposed. The basis of it is thermodynamic approach to analysis and synthesis (designing) of processes (the application of thermodynamic exergy method). The proposed methodology was approved by water chemical process designing of large-scale glass enterprises (production of glass fiber, glass cloth, hardened glass).ΠŸΡ€Π΅Π΄Π»ΠΎΠΆΠ΅Π½Π° мСтодология проСктирования Π²ΠΎΠ΄Π½Ρ‹Ρ… Ρ€Π΅ΡΡƒΡ€ΡΠΎΡΠ±Π΅Ρ€Π΅Π³Π°ΡŽΡ‰ΠΈΡ… Ρ…ΠΈΠΌΠΈΠΊΠΎ- тСхнологичСских систСм ΡΡ‚Π΅ΠΊΠΎΠ»ΡŒΠ½Ρ‹Ρ… производств. Основой Π΅Π΅ слуТит тСрмодинамичСский ΠΏΠΎΠ΄Ρ…ΠΎΠ΄ ΠΊ Π°Π½Π°Π»ΠΈΠ·Ρƒ ΠΈ синтСзу (ΠΏΡ€ΠΎΠ΅ΠΊΡ‚ΠΈΡ€ΠΎΠ²Π°Π½ΠΈΡŽ) производствСнных процСссов (ΠΏΡ€ΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ тСрмодинамичСского эксСргСтичСского ΠΌΠ΅Ρ‚ΠΎΠ΄Π°). ΠŸΡ€Π΅Π΄Π»ΠΎ- ТСнная мСтодология Π°ΠΏΡ€ΠΎΠ±ΠΈΡ€ΠΎΠ²Π°Π½Π° ΠΏΡ€ΠΈ ΠΏΡ€ΠΎΠ΅ΠΊΡ‚ΠΈΡ€ΠΎΠ²Π°Π½ΠΈΠΈ Π²ΠΎΠ΄Π½Ρ‹Ρ… Ρ…ΠΈΠΌΠΈΠΊΠΎ-тСхнологичСских систСм ΠΊΡ€ΡƒΠΏΠ½Ρ‹Ρ… ΡΡ‚Π΅ΠΊΠΎΠ»ΡŒΠ½Ρ‹Ρ… прСдприятий (производств ΠΏΠΎ выпуску стСкловолокна, стСклоткани, Π±Ρ€ΠΎΠ½ΠΈΡ€ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ стСкла)

    ΠžΡΠΎΠ±Π΅Π½Π½ΠΎΡΡ‚ΠΈ эксСргСтичСского Π°Π½Π°Π»ΠΈΠ·Π° ΡΠ½Π΅Ρ€Π³ΠΎΡ€Π΅ΡΡƒΡ€ΡΠΎΡΠ±Π΅Ρ€Π΅Π³Π°ΡŽΡ‰ΠΈΡ… систСм Π²ΠΎΠ΄Π½ΠΎΠ³ΠΎ хозяйства

    Get PDF
    The specific features of applying the exergy analysis method for the energy resource saving waterworks systems of industrial plants were considered. The analysis of the influence of changes in polluting substance mass loading value on changes in exergy value upon mixing water technological flows was carried out.РассмотрСны особСнности примСнСния ΠΌΠ΅Ρ‚ΠΎΠ΄Π° эксСргСтичСского Π°Π½Π°Π»ΠΈΠ·Π° энСргорСсурсо-сбС-Ρ€Π΅Π³Π°ΡŽΡ‰ΠΈΡ… систСм Π²ΠΎΠ΄Π½ΠΎΠ³ΠΎ хозяйства ΠΏΡ€ΠΎΠΌΡ‹ΡˆΠ»Π΅Π½Π½Ρ‹Ρ… прСдприятий. ΠŸΡ€ΠΎΠ²Π΅Π΄Π΅Π½ Π°Π½Π°Π»ΠΈΠ· влияния измСнСния Π²Π΅Π»ΠΈΡ‡ΠΈΠ½Ρ‹ массовой Π½Π°Π³Ρ€ΡƒΠ·ΠΊΠΈ ΠΏΠΎ Π·Π°Π³Ρ€ΡΠ·Π½ΡΡŽΡ‰Π΅ΠΌΡƒ вСщСству Π½Π° ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ значСния эксСргии ΠΏΡ€ΠΈ смСшивании Π²ΠΎΠ΄Π½Ρ‹Ρ… тСхнологичСских ΠΏΠΎΡ‚ΠΎΠΊΠΎΠ²

    SOCIAL HEALTH DETERMINES MENTAL AND PHYSICAL DEVELOPMENT OF YOUNG PEOPLE

    Full text link
    The article deals with the issue of modern understanding of social health and its impact on the mental and physical development of a young person in high school. Using the method of analysis, a study of the term "social health" in its modern sense was conducted. Using the method of M. Rokich, a study of terminal and instrumental in 363 students of the direction of training "State and municipal management" AT the Ural Federal University named after the first President of Russia B. N. Yeltsin was conducted. The results show that the system of socially-oriented values of a young person determines his social health, as well as determines his mental and physical development.Π’ ΡΡ‚Π°Ρ‚ΡŒΠ΅ рассматриваСтся вопрос ΠΎ соврСмСнном ΠΏΠΎΠ½ΠΈΠΌΠ°Π½ΠΈΠΈ ΡΠΎΡ†ΠΈΠ°Π»ΡŒΠ½ΠΎΠ³ΠΎ Π·Π΄ΠΎΡ€ΠΎΠ²ΡŒΡ ΠΈ влиянии Π΅Π³ΠΎ Π½Π° психичСскоС ΠΈ физичСскоС Ρ€Π°Π·Π²ΠΈΡ‚ΠΈΠ΅ ΠΌΠΎΠ»ΠΎΠ΄ΠΎΠ³ΠΎ Ρ‡Π΅Π»ΠΎΠ²Π΅ΠΊΠ° Π² условиях Π²Ρ‹ΡΡˆΠ΅ΠΉ ΡˆΠΊΠΎΠ»Ρ‹. Π‘ ΠΏΠΎΠΌΠΎΡ‰ΡŒΡŽ ΠΌΠ΅Ρ‚ΠΎΠ΄Π° Π°Π½Π°Π»ΠΈΠ·Π° ΠΏΡ€ΠΎΠ²Π΅Π΄Π΅Π½ΠΎ исслСдованиС Ρ‚Π΅Ρ€ΠΌΠΈΠ½Π° Β«ΡΠΎΡ†ΠΈΠ°Π»ΡŒΠ½ΠΎΠ΅ Π·Π΄ΠΎΡ€ΠΎΠ²ΡŒΠ΅Β» Π² соврСмСнном Π΅Π³ΠΎ ΠΏΠΎΠ½ΠΈΠΌΠ°Π½ΠΈΠΈ. Π‘ ΠΏΠΎΠΌΠΎΡ‰ΡŒΡŽ ΠΌΠ΅Ρ‚ΠΎΠ΄ΠΈΠΊΠΈ М. Π ΠΎΠΊΠΈΡ‡Π° ΠΏΡ€ΠΎΠ²Π΅Π΄Π΅Π½ΠΎ исслСдованиС Ρ‚Π΅Ρ€ΠΌΠΈΠ½Π°Π»ΡŒΠ½Ρ‹Ρ… ΠΈ ΠΈΠ½ΡΡ‚Ρ€ΡƒΠΌΠ΅Π½Ρ‚Π°Π»ΡŒΠ½Ρ‹Ρ… Ρƒ 363 студСнтов направлСния ΠΏΠΎΠ΄Π³ΠΎΡ‚ΠΎΠ²ΠΊΠΈ «ГосударствСнноС ΠΈ ΠΌΡƒΠ½ΠΈΡ†ΠΈΠΏΠ°Π»ΡŒΠ½ΠΎΠ΅ ΡƒΠΏΡ€Π°Π²Π»Π΅Π½ΠΈΠ΅Β» Π² Π€Π“ΠΠžΠ£ Π’Πž Β«Π£Ρ€Π°Π»ΡŒΡΠΊΠΈΠΉ Ρ„Π΅Π΄Π΅Ρ€Π°Π»ΡŒΠ½Ρ‹ΠΉ унивСрситСт ΠΈΠΌΠ΅Π½ΠΈ ΠΏΠ΅Ρ€Π²ΠΎΠ³ΠΎ ΠŸΡ€Π΅Π·ΠΈΠ΄Π΅Π½Ρ‚Π° России Π‘. Н. Π•Π»ΡŒΡ†ΠΈΠ½Π°Β». ΠŸΠΎΠ»ΡƒΡ‡Π΅Π½Π½Ρ‹Π΅ Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Ρ‹ ΠΏΠΎΠΊΠ°Π·Ρ‹Π²Π°ΡŽΡ‚, Ρ‡Ρ‚ΠΎ систСма ΡΠΎΡ†ΠΈΠ°Π»ΡŒΠ½ΠΎ-ΠΎΡ€ΠΈΠ΅Π½Ρ‚ΠΈΡ€ΠΎΠ²Π°Π½Π½Ρ‹Ρ… цСнностСй ΠΌΠΎΠ»ΠΎΠ΄ΠΎΠ³ΠΎ Ρ‡Π΅Π»ΠΎΠ²Π΅ΠΊΠ° опрСдСляСт Π΅Π³ΠΎ ΡΠΎΡ†ΠΈΠ°Π»ΡŒΠ½ΠΎΠ΅ Π·Π΄ΠΎΡ€ΠΎΠ²ΡŒΠ΅, Π° Ρ‚Π°ΠΊΠΆΠ΅ опрСдСляСт Π΅Π³ΠΎ психичСскоС ΠΈ физичСскоС Ρ€Π°Π·Π²ΠΈΡ‚ΠΈΠ΅

    ВлияниС Π±ΠΈΠΎΠ³Π΅Π½Π½Ρ‹Ρ… элСмСнтов Π½Π° Ρ„ΠΈΡ‚ΠΎΡΠΊΡΡ‚Ρ€Π°ΠΊΡ†ΠΈΡŽ кадмия ΠΈΠ· загрязнСнной ΠΏΠΎΡ‡Π²Ρ‹

    Get PDF
    The influence of substances containing biogenic elements (potassium chloride, sodium phosphate, ammonium nitrate, potassium and urea nitrate) on phytoextraction degree of cadmium from soil by cultivated oat (Avena sativa L.), cutting lettuce (Lactuca sativa L.) and charlock (Sinapis arvensis L.) has been investigated. As the results of experiment the factors used for estimation of relationship between the environment and a physiological role of a chemical element, and also for revealing of its share in biotic turnover and of a role of organisms-indicators and organisms-concentrators have been calculated: phytotoxic effect and factor of biological absorbing of cadmium by plants. It is shown that potassium nitrate promote the extraction of cadmium from soil in a greater degree in comparison with other substances containing biogenic elements.ИсслСдовано влияниС вСщСств , содСрТащих Π±ΠΈΠΎΠ³Π΅Π½Π½Ρ‹Π΅ элСмСнты ( Ρ…Π»ΠΎΡ€ΠΈΠ΄Π° калия , фосфата натрия , Π½ΠΈΡ‚Ρ€Π°Ρ‚Π° аммония , Π½ΠΈΡ‚Ρ€Π°Ρ‚Π° калия ΠΈ ΠΌΠΎΡ‡Π΅Π²ΠΈΠ½Ρ‹ ) Π½Π° ΡΡ‚Π΅ΠΏΠ΅Π½ΡŒ фитоэкстракции кадмия ΠΈΠ· ΠΏΠΎΡ‡Π²Ρ‹ овсом посСвным (Avena sativa L.), салатом листовым (Lactuca sativa L.) ΠΈ Π³ΠΎΡ€Ρ‡ΠΈΡ†Π΅ΠΉ ΠΏΠΎΠ»Π΅Π²ΠΎΠΉ (Sinapis arvensis L.). По Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Π°ΠΌ экспСримСнта рассчитаны ΠΏΠΎΠΊΠ°Π·Π°Ρ‚Π΅Π»ΠΈ, ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΡŽΡ‰ΠΈΠ΅ΡΡ для ΠΎΡ†Π΅Π½ΠΊΠΈ связи срСды ΠΈ физиологичСской Ρ€ΠΎΠ»ΠΈ химичСского элСмСнта, Π° Ρ‚Π°ΠΊΠΆΠ΅ для выявлСния Π΅Π³ΠΎ участия Π² биотичСском ΠΊΡ€ΡƒΠ³ΠΎΠ²ΠΎΡ€ΠΎΡ‚Π΅, Ρ€ΠΎΠ»ΠΈ ΠΎΡ€Π³Π°Π½ΠΈΠ·ΠΌΠΎΠ²-ΠΈΠ½Π΄ΠΈΠΊΠ°Ρ‚ΠΎΡ€ΠΎΠ² ΠΈ ΠΎΡ€Π³Π°Π½ΠΈΠ·ΠΌΠΎΠ²-ΠΊΠΎΠ½Ρ†Π΅Π½Ρ‚Ρ€Π°Ρ‚ΠΎΡ€ΠΎΠ²: фитотоксичСский эффСкт ΠΈ коэффициСнт биологичСского поглощСния кадмия растСниями. Показано, Ρ‡Ρ‚ΠΎ Π½ΠΈΡ‚Ρ€Π°Ρ‚ калия Π² большСй стСпСни, ΠΏΠΎ ΡΡ€Π°Π²Π½Π΅Π½ΠΈΡŽ с Π΄Ρ€ΡƒΠ³ΠΈΠΌΠΈ вСщСствами, содСрТащими Π±ΠΈΠΎΠ³Π΅Π½Π½Ρ‹Π΅ элСмСнты, способствуСт ΠΈΠ·Π²Π»Π΅Ρ‡Π΅Π½ΠΈΡŽ кадмия ΠΈΠ· ΠΏΠΎΡ‡Π²Ρ‹
    • …
    corecore