A new approach to the design of wide-band multiprobe reflectometers

A new design approach for low-cost multiprobe reflectometers is presented. While traditional circuits adopt equally-spaced probes, the presented solution provide a method to greatly enhance the bandwidth of the measuring system by a proper choice of each probe position. As example, a five-probe 0.6-16 GHz system has been designed

Making the farm grounds attractive

September, 1938

Evaluation of strand-to-strand capacitance and dissipation factor in thermally aged enamelled coils for low-voltage electrical machines

© The Institution of Engineering and Technology 2019. The dissipation factor (i.e. tanδ) and insulation capacitance (IC) measurements are conventional monitoring methods for assessing the aging level of insulation systems. These quantities provide an invaluable indication of the dielectric losses within the insulating materials. However, how these values are affected by the aging processes due to thermal stresses have until today never been investigated fully. Thus, this study exhibits the influence of thermal aging on tanδ and IC of windings for electrical machines (EMs). The work is performed for class 200, round enamelled magnet wire specimens. The study aims at improving the design process of EMs for short duty cycle applications; hence, its outcome might be included at the design stage for enhancing reliability and lifetime. Random wound coils are chosen in the performed study, because they are the most common winding arrangement for low-voltage EMs, which are employed in a wide range of applications (e.g. from home appliances to aerospace motors). Based on the collected data, considerations regarding the impact of relative humidity on both the dissipation factor and IC are presented. Finally, the correlation between the partial discharge inception voltage and the diagnostic measurements is experimentally verified

The link between eddy-driven jet variability and weather regimes in the North Atlantic-European sector

This study reconciles two perspectives on wintertime atmospheric variability in the North Atlantic–European sector: the zonal‐mean framework comprising three preferred locations of the eddy‐driven jet (southern, central, northern), and the weather regime framework comprising four classical North Atlantic‐European regimes (Atlantic ridge AR, zonal ZO, European/Scandinavian blocking BL, Greenland anticyclone GA). A k‐means clustering algorithm is used to characterize the two‐dimensional variability of the eddy‐driven jet stream, defined by the lower tropospheric zonal wind in the ERA‐Interim reanalysis. The first three clusters capture the central jet and northern jet, along with a new mixed‐jet configuration; a fourth cluster is needed to recover the southern jet. The mixed cluster represents a split or strongly tilted jet, neither of which is well described in the zonal‐mean framework, and has a persistence of about one week, similar to the other clusters. Connections between the preferred jet locations and weather regimes are corroborated – southern to GA, central to ZO, and northern to AR. In addition, the new mixed cluster is found to be linked to European/Scandinavian blocking, whose relation to the eddy‐driven jet was previously unclear.publishedVersio

The Cost of Majority-Party Bias: Amending Activity under Structured Rules

All major legislation in the House necessitates a special rule from the Rules Committee before it can be brought to the chamber floor. These rules often strictly limit floor amendments to bills considered by the House. Scholars of political parties have argued that the House majority party can bias policy output away from the floor median through its usage of restrictive rules. In this article, we argue that in order to secure the passage of restrictive rules, the majority often makes concessions to centrist legislators through the amending process. We examine this theory using a newly collected data set that includes all amendments considered by the Rules Committee during the construction of structured rules in the 109th, 110th, and 111th Congresses (2005–2010). Our results are mixed, but they do suggest that moderate members of the majority party often receive concessions via amendments for their support of the majority party's agenda-setting regime

Mobilization of Cyber Extension Participants to Build Household Food Security

Youtuber, Tiktokers and content creater exist on internet who actively showing agricultural information in limited land, hydroponic cultivation also tips for utilization home yard as plantation productive a form public participation in an attempt to increase agricultural in micro scale. The impressions agricultural innovative and creatives from content creators in internet is a phenomenon change occurs paradigm education present that openly also no need to rely on employment of counseling functional with status State Civil Apparatus. Absence content creator information about alternative agricultural can categorize to participant cyber extension in order to build food resilience at the household level. Cyber extension that is conducted on public became concept participative counceling that are relevant developed when limited quantity human resources agricultural counselors, procurement material and support facilities. Purpose: studies on existence participant cyber extension to design programs and strategy mobilize content creator into intensify extension utilization home yard to plant productive to build food resilience household. This study improving concept couceling based society and mobilization power source theory. Method: systematics literatur review with qualitative approach. Result: (1) Need to be given coaching or mentoring for participants especially content creator to produce mater that are educative and solutive for society who want start plating at home yard (2) Giving appreciation or reward to participant who active and creatuve doing cyber extensionKeberadaan YouTuber, Tiktokers dan Content Creator di internet yang giat menayangkan informasi  pertanian di lahan terbatas,  budidaya tanaman hidroponik serta kiat memanfaatkan pekarang rumah sebagai lahan perkebunan produktif merupakan sebuah wujud partisipasi masyarakat dalam  upaya meningkatkan produksi pertanian skala mikro. Tayangan pertanian inovatif dan kreatif dari para pembuat konten di internet adalah fenomena  terjadinya perubahan paradigma penyuluhan masa kini yang terbuka serta tidak harus mengandalkan kerja penyuluh  fungsional dengan status Aparatur Sipil Negara (ASN). Kehadiran pencipta konten (content creator) informasi pertanian alternatif dapat dikategorikan sebagai partisipan penyuluhan di ruang siber atau cyber extension dalam rangka membangun ketahanan pangan pada tingkat rumah tangga. Cyber extension yang dilakukan publik menjadi konsep penyuluhan partisipatif yang relevan dikembangkan ketika terbatasnya jumlah Sumber Daya Manusia (SDM) penyuluh pertanian, pengadaan materi dan fasilitas pendukungnya. Tujuan:  kajian mengenai eksistensi partisipan cyber extension untuk merancang program maupun strategi memobilisasi pencipta konten dalam menggencarkan penyuluhan pemanfaatan pekarangan untuk tanaman produktif guna membangun ketahanan pangan rumah tangga. Kajian ini mengembangkan konsep penyuluhan berbasis masyarakat dan teori mobilisasi sumber daya. Metode: sistematics literatur review dengan pendekatan kualitatif. Hasil: (1) Perlu diberikan pembinaan atau pendampingan bagi partisipan utamanya pencipta konten untuk menghasilkan materi yang bersifat edukatif dan solutif bagi masyarakat yang ingin memulai menanam di pekarangan. (2) Memberikan apresiasi atau reward kepada partisipan yang aktif dan kreatif melakukan cyber extension

Effective resolution concepts for lidar observations

Abstract. Since its establishment in 2000, EARLINET (European Aerosol Research Lidar NETwork) has provided, through its database, quantitative aerosol properties, such as aerosol backscatter and aerosol extinction coefficients, the latter only for stations able to retrieve it independently (from Raman or high-spectral-resolution lidars). These coefficients are stored in terms of vertical profiles, and the EARLINET database also includes the details of the range resolution of the vertical profiles. In fact, the algorithms used in the lidar data analysis often alter the spectral content of the data, mainly acting as low-pass filters to reduce the high-frequency noise. Data filtering is described by the digital signal processing (DSP) theory as a convolution sum: each filtered signal output at a given range is the result of a linear combination of several signal input data samples (relative to different ranges from the lidar receiver), and this could be seen as a loss of range resolution of the output signal. Low-pass filtering always introduces distortions in the lidar profile shape. Thus, both the removal of high frequency, i.e., the removal of details up to a certain spatial extension, and the spatial distortion produce a reduction of the range resolution. This paper discusses the determination of the effective resolution (ERes) of the vertical profiles of aerosol properties retrieved from lidar data. Large attention has been dedicated to providing an assessment of the impact of low-pass filtering on the effective range resolution in the retrieval procedure

Numerical estimation of Carbonate properties using a digital rock physics workflow

Digital rock physics combines modern imaging with advanced numerical simulations to analyze the physical properties of rocks -- In this paper we suggest a special segmentation procedure which is applied to a carbonate rock from Switzerland -- Starting point is a CTscan of a specimen of Hauptmuschelkalk -- The first step applied to the raw image data is a nonlocal mean filter -- We then apply different thresholds to identify pores and solid phases -- Because we are aware of a nonneglectable amount of unresolved microporosity we also define intermediate phases -- Based on this segmentation determine porositydependent values for the pwave velocity and for the permeability -- The porosity measured in the laboratory is then used to compare our numerical data with experimental data -- We observe a good agreement -- Future work includes an analytic validation to the numerical results of the pwave velocity upper bound, employing different filters for the image segmentation and using data with higher resolutio