The role of community acceptance in planning outcomes for onshore wind and solar farms: An energy justice analysis

The deployment of renewable technologies as part of climate mitigation strategies have provoked a range of responses from various actors, bringing public acceptance to the forefront of energy debates. A key example is the reaction of communities when renewable projects are proposed in their local areas. This paper analyses the effect that community acceptance has had on planning applications for onshore wind and solar farms in Great Britain between 1990 and 2017. It does this by compiling a set of indicators for community acceptance and testing their association with planning outcomes using binomial logistic regression. It identifies 12 variables with statistically significant effects: 4 for onshore wind, 4 for solar farms, and 4 spanning both. For both technologies, the visibility of a project, its installed capacity, the social deprivation of the area, and the year of the application are significant. The paper draws conclusions from these results for community acceptance and energy justice, and discusses the implications for energy decision-making

Thermal susceptibility of the Planck-LFI receivers

This paper is part of the Prelaunch status LFI papers published on JINST: http://www.iop.org/EJ/journal/-page=extra.proc5/jinst . This paper describes the impact of the Planck Low Frequency Instrument front end physical temperature fluctuations on the output signal. The origin of thermal instabilities in the instrument are discussed, and an analytical model of their propagation and impact on the receivers signal is described. The experimental test setup dedicated to evaluate these effects during the instrument ground calibration is reported together with data analysis methods. Finally, main results obtained are discussed and compared to the requirements.Comment: This is an author-created, un-copyedited version of an article accepted for publication in Journal of Instrumentation. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at 10.1088/1748-0221/4/12/T1201

Fabrication error Indexed eXamples and Solutions: FIXS

The major goal of the Regional/National Bridge Fabrication Error Expert System research project is to develop a sharable and well reasoned bridge fabrication error repair database which can be used by several state: DOTs within a geographical,. region. This report focuses on the enhancement of the knowledge base and improvement of the system performance based on the initial work of Fabrication error Indexed examples and Solutions (FIXS). FIXS is a knowledge-based system in the domain of steel bridge fabrication errors using both rule-based reasoning and casebased reasoning. To expand the knowledge base to cover errors experienced by multiple DOTs and to improve the system effectiveness, 38 new cases were solicited from the North Central States Consortium and the Repair Database Task Group of the AASHTONSBA Steel Bridge Collaboration. The new cases, along with the existing 120 rule solutions and 112 case solutions in the knowledge base, were reviewed by the Task Group members. The sketches and instructions summarized from actual cases and the comments obtained from the Task Group members were implemented in the ,, software to provide graphical and instructive information for case solutions. In addition, generic problems and corrections were also collected and implemented in the software as a tutorial tool for common fabrication errors. To improve the accuracy of similar case retrieval, the case-based reasoning shell SCBR was revised by introducing continuous feature evaluation for numeric features, replacing the simple match approach in the first version of FIXS. The explanation facility was also improved

LFI 30 and 44 GHz receivers Back-End Modules

The 30 and 44 GHz Back End Modules (BEM) for the Planck Low Frequency Instrument are broadband receivers (20% relative bandwidth) working at room temperature. The signals coming from the Front End Module are amplified, band pass filtered and finally converted to DC by a detector diode. Each receiver has two identical branches following the differential scheme of the Planck radiometers. The BEM design is based on MMIC Low Noise Amplifiers using GaAs P-HEMT devices, microstrip filters and Schottky diode detectors. Their manufacturing development has included elegant breadboard prototypes and finally qualification and flight model units. Electrical, mechanical and environmental tests were carried out for the characterization and verification of the manufactured BEMs. A description of the 30 and 44 GHz Back End Modules of Planck-LFI radiometers is given, with details of the tests done to determine their electrical and environmental performances. The electrical performances of the 30 and 44 GHz Back End Modules: frequency response, effective bandwidth, equivalent noise temperature, 1/f noise and linearity are presented

Comparison of QPE and QSIM as Qualitative Reasoning Techniques

Qualitative reasoning predicts and explains the behavior of physical systems using the system's structure through modeling and simulation. There are several approaches to qualitative reasoning. Two of the most prominent software implementations are QPE (Qualitative Process Engine) by Forbus and QSIM (Qualitative Simulation) by Kuipers. A comparison of the two systems is done on the basis of representation and reasoning ability of physical systems. The standard examples in qualitative reasoning and examples in fatigue and fracture in metals are used in the comparison. The fatigue and fracture domain of study can serve as a prototype for other related models of material behavior. A thorough comparison of QSIM and QPE identifies future directions of qualitative reasoning development

Torsion of Exterior Girders of a Steel Girder Bridge During Concrete Deck Placement Loads: Field Test Report

This report is the second part of a two part report. The first part is written and developed as a design aid to determine the torsion acting on outside steel bridge girders during concrete deck placement. This second part reports results of measurements taken from two bridges. The first bridge is located at K-10 highway over I-70 between Lawrence and Topeka, Kansas. The second bridge is located on southbound I-635 highway over Swartz Road in Kansas City, Kansas. During bridge construction, deck overhang loads occur on steel plate or rolled beam girders and are supported by cantilever brackets. In addition to supporting the weight of the placement screed, these brackets must also support the weight of the additional construction loads. The vertical loads applied on the deck are eccentric and generate large torsional moments at the intervals between cross bracing. The result of this loading effect is torsional moments that generate a combination of longitudinal stresses and loads from the cantilever brackets. Strain gages were installed on the Swartz Road bridge to measure these overhang loads. A "Multiframe 4D" computer model was made to compare the results measured in the field, with AISC recommendations, and with TAEG ( Torsional Analysis of Exterior Girders) results. The screed loads measured from the static load runs and analytical model were based on the locations of bogey and gang vibrators. In the analytical model, the loads were moved across the beam at quarter points beginning at midspan, then tabulated and plotted alongside the field results. After all of the moments representing the various load cases were compiled, an influence diagram was constructed from the loads measured in the field and the analytical model. Loads were analyzed for two cases using the AISC method outlined in the "Design for Concrete Overhang Loads". The first load case represented the static field test while the second represented the results measured the day of concrete placement. The same wheel loading for the analytical model was used for the AISC calculations. In some instances, the strains measured on the Swartz Road bridge were small. In these situations it can be difficult to guarantee the sensitivity and output of gage readings, however, the major axis moments measured on the Swartz Road bridge during static load testing were almost identical to the moments calculated with the Multiframe analysis. This shows that the loads that were used and how they were distributed in the Multiframe analysis were close to actual field conditions. This also shows consistent. and accurate behavior of the strain gages. No significant differences were found with the moments measured from the static load runs where blocking had been removed. More blocking had been provided than what was needed on the Swartz Road bridge, however, when concrete and live loads are added, the change in load response should be greater. Surveying prisms were used to measure deflections during the load tests. The recorded and predicted maximum vertical deflections on the Swartz Road bridge were consistently ~lose for all load runs. Horizontal deflections were not observed at any location. The Multiframe model used to calculate torsional bending did match closely with the moments measured in the field at midpoint between stiffeners but varied greatly between measured and analytical results for endpoint locations. The computer model used to calculate torsional bending did not match as closely with the moments measured in the field. The difference between measured and analytical results varied for maximum values but was in relative agreement for the trends of the moments. Most of the differences can be attributed to the lateral stiffness provided by a combination of deck formwork and a portion of concrete deck in place in the Northbound lanes. Unfortunately, the loose play of the form work connections to the girder makes the lateral stiffness difficult to measure. Some of the differences in the torsional moments that were calculated using the Multiframe model and the TAEG program can be attributed to some basic model assumptions. The Multiframe analysis was based on a non-prismatic girder section that was continuous over diaphragm locations. The T AEG program assumes a three span, prismatic member. A comparison of torsional moments calculated by T AEG show a large difference in results from field measurements, the torsional model, and AISC calculations. In some cases the differences are small and in others they are significant. For the static field tests and the Multiframe torsion models, the trends show close similarity, however the maximum loads for all locations do vary. The TAEG program was always conservative in comparison to the field results and the multiframe model. Since the T AEG program is intended to be used as an in-house design aid, this conservative approach is regarded as positive

Planck pre-launch status: calibration of the Low Frequency Instrument flight model radiometers

The Low Frequency Instrument (LFI) on-board the ESA Planck satellite carries eleven radiometer subsystems, called Radiometer Chain Assemblies (RCAs), each composed of a pair of pseudo-correlation receivers. We describe the on-ground calibration campaign performed to qualify the flight model RCAs and to measure their pre-launch performances. Each RCA was calibrated in a dedicated flight-like cryogenic environment with the radiometer front-end cooled to 20K and the back-end at 300K, and with an external input load cooled to 4K. A matched load simulating a blackbody at different temperatures was placed in front of the sky horn to derive basic radiometer properties such as noise temperature, gain, and noise performance, e.g. 1/f noise. The spectral response of each detector was measured as was their susceptibility to thermal variation. All eleven LFI RCAs were calibrated. Instrumental parameters measured in these tests, such as noise temperature, bandwidth, radiometer isolation, and linearity, provide essential inputs to the Planck-LFI data analysis.Comment: 15 pages, 18 figures. Accepted for publication in Astronomy and Astrophysic

Steel Bridge Fabrication Errors Indexed Examples and Solutions: Combining Rules and Cases

This research focuses on the development of a knowledge-based system in the domain of steel bridge fabrication errors using both rule-based reasoning (RBR) and case-based reasoning (CBR). Fabrication error Indexed and Solutions (FIXS) was developed to combine the benefits of two previous research projects: 1) the rule-based Bridge Fabrication error solution eXpert system (BFX), and 2) its case-based counterpart (CB-BFX). Errors that occur during the fabrication of steel bridg~ members can have a costly effect on the performance of a bridge if not repaired properly. FIXS is an effort to provide guidance to the bridge engineer responsible for cost effective solutions in a time sensitive manner. FIXS is implemented in the programming language PROLOG and runs in the Windows environment as a stand-alone application. RBR facilities are provided by the expert system shell MESS (Modest Expert System Shell). Similarly, CBR functions are provided by the simple case-based reasoner shell SCBR (Simple Case Based Reasoning). The application has been designed for addition of new domain knowledge. The addition of new and updated knowledge allows the application to keep pace with changes in the steel bridge design industry and the methods of repairing errors

Torsional Analysis for Exterior Girders

Concrete deck placement imposes eccentric loading on exterior steel bridge girders. This report describes a design tool that aids bridge engineers in evaluating the response of the exterior girder due to this eccentric loading. Computer analyses are conducted in order to gain a detailed understanding of the factors influencing the response of the girder. It is shown that the “flexure analogy” is correct and can be used in the design tool. The “flexure analogy” is the assumption that torsional loads on the girder are mainly carried by the flanges in minor axis bending. Top and bottom flanges need to be analyzed independently since the boundary conditions for them vary significantly. Furthermore, analyses indicate that a substantial improvement in accuracy can be achieved if the boundary conditions on the local system used to analyze the behavior of the girder are changed. The influence of dynamic loads, such as the movement of the finisher and the impact of concrete during the placement process, is investigated and found to be negligible. Based on these findings, a design tool in the form of a Visual Basic © application, TAEG (Torsional Analysis of Exterior Girders), for Windows 95/NT © has been created. It uses the stiffness method to calculate the stresses and deflections of the flanges due to torsional loads. Results for bracket forces and diaphragms are also calculated. TAEG can be used to evaluate the effect of temporary support in the form of tie rods and blocking. Three examples are provided to justify the results and are compared with existing methods or field data. TAEG uses a 3-span fixed end continuous beam analysis model for finding torsional stresses while the AISC Design Guide method uses a less accurate single span fixed end model. Therefore, in comparison to the AISC Design Guide method stress results calculated with ATEG are approximately 20% higher for the positive moment region and approximately 20% lower for the negative moment region. Generally, stresses at the negative moment region govern

The linearity response of the Planck-LFI flight model receivers

In this paper we discuss the linearity response of the Planck-LFI receivers, with particular reference to signal compression measured on the 30 and 44 GHz channels. In the article we discuss the various sources of compression and present a model that accurately describes data measured during tests performed with individual radiomeric chains. After discussing test results we present the best parameter set representing the receiver response and discuss the impact of non linearity on in-flight calibration, which is shown to be negligible.Comment: this paper is part of the Prelaunch status LFI papers published on JINST: http://www.iop.org/EJ/journal/-page=extra.proc5/jinst; This is an author-created, un-copyedited version of an article accepted for publication in JINST. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at 10.1088/1748-0221/4/12/T12011