Measurement of Infrasound Components Contained in the Noise Emitted during a Working Wind Turbine

The research reported in this paper involves the development and refinement of methods applicable to the measurement and analysis of infrasound signals generated by the operation of wind turbines. In particular, the presentation focuses on the use of a new system that is applied for simultaneous recording of acoustic signals in the low-frequency range emitted by wind farms in three independent and identical measurement setups. A comparative analysis of the proposed new system was made with the Brüel & Kjaer measurement, a commonly used methodology, which meets the requirements of the IEC 61400-11 standard. The paper focuses on the results of frequency and time-frequency analysis of infrasound signals recorded throughout the operation of a wind turbine with a rated capacity of 2 MW. The use of a correlated system with three simultaneous measurement systems can be a new and alternative measurement method that will eliminate the drawbacks of previous approaches.

The Delay Measurement and Analysis of Unreachable Hosts of Internet

Delay related metrics are significant quality of service criteria for the performance evaluation of networks. Almost all delay related measurement and analysis studies take into consideration the reachable sources of Internet. However, unreachable sources might also shed light upon some problems such as worm propagation. In this study, we carry out a delay measurement study of unreachable destinations and analyse the delay dynamics of unreachable nodes. 2. Internet Control Message Protocol (ICMP) destination unreachable Internet Control Message Protocol-Destination Unreachable (ICMP T3) packets are considered for the delay measurement according to their code types which shows network un reach ability, host un reach ability, port un reach ability, etc. Measurement results show that unreachable sources exhibit totally different delay behaviour compared to reachable IP hosts. A significant part of the unreachable hosts experiences extra 3 seconds Round Trip Time (RTT) delay compared to accessible hosts mostly due to host un reach ability. It is also seen that, approximately 79% of destination un reach ability causes from host un reach ability. Obtained Hurst parameter estimation results reveal that unreachable host RTTs show lower Hurst degree compared to reachable hosts which is approximately a random behaviour. Unreachable sources exhibit totally different distributional characteristic compared to accessible ones which is best fitted with Phased Bi-Exponential distribution.

A System for Measurement and Analysis of Aircraft Noise Impacts

The Metroplex Overflight Noise Analysis (MONA) project seeks to measure, analyze, and archive the ground noise generated by aircraft overflights and to provide accurate and actionable data for a variety of different purposes. On the one hand, experimental datasets collected and processed by the MONA system can serve as an openly-available database for validation and verification (V&V) of improved noise prediction methods. On the other, study conclusions derived from both the experimental and computational data can serve to inform technical discussions and options involving aircraft noise, aircraft routes, and the potential impacts of the FAA’s NextGen procedure changes on overflown communities at varying distances from the airport. Given the complex interdependencies between the noise levels perceived on the ground and the air-traffic patterns that generate the aircraft noise, a secondary goal of the MONA project is to share, through compelling visualizations, key results with broad communities of stakeholders to help generate a common understanding and reach better decisions more quickly. In this paper, we focus on the description of the MONA system architecture, its design, and its current set of capabilities. Subsequent publications will focus on the results we are obtaining though the use of the MONA system.

Automated Measurement and Analysis of Sidewall Roughness (SWR) Using 3D-AFM

As the semiconductor device architecture develops, from planar field-effect transistor (FET) to FinFET and toward gate all around (GAA), it is more needed to measure 3D structure sidewall precisely. Here, we present a 3D-atomic force microscopy (3D-AFM) by Park Systems Corp., a powerful 3D metrology tool to measure SWR of vertical and undercut structures. First, we measured 3 different dies repeatedly to calculate reproducibility in die level. Reproducible results were derived with relative standard deviation under 2%. Second, we measured 13 different dies, including the center and edge of the wafer, to analyze SWR distribution in wafer level and reliable results were measured. And all analysis was performed using a novel algorithm including auto flattening, sidewall detection, and SWR calculation. In addition, SWR automatic analysis software was implemented to reduce analysis time and to provide standard analysis. The result suggests that our 3D-AFM based on tilted Z scanner enabled an advanced methodology for automated 3D measurement and analysis.

Craniological sources on the problem of ethnogenesis of the Narym Selkups

The Narym Selkups are an indigenous population of the Middle Ob River region speaking various dialects of the Selkup language related to the South-Samodian branch of the Ural language family. In the course of the study of Medieval and relatively recent burial grounds in the territory of the Narym Ob area of Tomsk Oblast, considerable amount of craniological material has been collected, which constitutes an important historical source for solving general problems of their origins. According to the archaeological and ethnographic materials, the Medieval burials were left by direct ascendants of modern Narym Selkups, whereas the materials from the later burial grounds are directly associated with their specific local-dialect groups. This paper is aimed to introduce into scien-tific discourse virtually all craniological materials known today from the burial grounds left by the Narym Selkups, and, on the basis of the results of group cross-correlation, to identify trends of the territorial variability of the whole community. Significant increase of new finds from the vast territory of the Middle Ob region, population-driven approach to the data analysis and development of the craniometric technique warranted re-grouping of the finds by the territorial principle and their repeated measurement and analysis. In view of the current problem, all cranio-logical materials were grouped into ten sampling series, five of which are published for the first time (the burial ground of Ostyatskaya Gora and four combined craniological series from the burial grounds of Lower Chulym, Narym Ob, Upper Ket, and the Tym and Vasyugan rivers). Analysis of the variability of the series from the Narym Ob region in chronological and geographical bands showed their weak variability in space and time. Therefore, prior to the Russian colonization of Siberia, this region of the Middle Ob area was not invaded by considerably large groups of people of different anthropological appearance. All studied craniological series were samples from the single unity. Although the territorial variability of the anthropological features within the groups of the Narym Selkups is not large, in some cases an influence of territorially closest neighbours on the anthropological structures of particular Selkup populations can be discerned. It appeared that the southern groups exhibit resemblance with their territorially closest Turkic populations of the Chulym and Lower Tom regions, while in the composition of other Narym groups, there have been identified an admixture of the component genetically related to the Turkic populations of the Western-Siberian forest-steppe — Barabino and Tobol-Irtysh Tatars, and, although being very weak, an influence of the Ob Ugric populations can be discerned.

Measurement and analysis of refractive index structure constant Cn2 profile over Delhi on diurnal and seasonal basis

jsfM;ksa rjax ds lapj.k dks izHkkfor djus esa jsfM;ks viorZdrk ,d egRoiw.kZ dkjd dk dk;Z djrh gSA jsfM;ks viorZdrk] ok;qeaMy dh HkkSfrd voLFkkvksa tSls & rkieku] nkc vkSj vknzZrk ij fuHkZj djrh gSA jsMkj vR;Ur NksVh vk—fr ds viorZukad fHkUurkvksa tks jsMkj ds rjax nS/;Z dh vk/kh gksrh gS] ds izfr laosnh gksrs gSA i'p izdh.kZu 'kfDr viorZukad fu;rkad Cn2 dh vk—fr ds ifjek.k ij fuHkZj djrh gSA vr% ekSle jsMkj] fo’k"k :i foaM izksQkbyj jsMkj ds fM+tkbu ds fy, fdlh LFkku ds Cn2 ds eku mi;ksxh gksrs gSA bl 'kks/k i= esa fnYyh ds Åij ds mijhru ok;qeaMy esa ok;qeaMyh; viorZukad fu;rkad Cn2 dh :ijs[kk nSfud ,oa _rqvksa ds vk/kkj ij rS;kj djus dh dksf’k’k dh xbZ gSA The radio refractivity is an important factor which effects radio wave propagation. Radio refractivity depends upon the physical states of atmosphere, i.e., its temperature, pressure and humidity. Radars are sensitive to refractive index irregularities on scale size equal to half wavelength of Radar. Backscattered power is dependent on the magnitude of refractive index structure constant Cn2. Hence Cn2values of a place are useful for designing weather radar specially wind profiler radars. This paper is an attempt to map the profile of refractive index structure constant Cn2 of atmosphere in the upper atmosphere, over Delhi on diurnal and seasonal basis.