Active cavity radiometer, type III - An automatic, absolute standard, highly accurate detector

Instrument of simple construction operates without vacuum enclosure over wide pressure range and temperatures from 218 to 398 deg K and defines absolute radiometric scale to within less than 0.5 mW/sq cm. It has potential application to meteorology and climatology and operates on electrical substitution calorimeter principle

Active Cavity Radiometer (ACR)

The objective of the Active Cavity Radiometer (ACR) experiment on the Atmospheric Laboratory for Applications and Science (ATLAS) mission is the measurement of the total solar irradiance with state-of-the-art accuracy and precision. This experiment is part of an ongoing program of space flight observations to study short- and long-term variations in the total solar output of optical energy. Precise observations of solar total irradiance provide information on the solar cycle and other long-term trends in solar output that are of climatological significance as well as short-term solar physics phenomena such as radiation anisotropy, active region structure, missing flux due to sunsports, bolometry of solar flares, global oscillations, coronal holes, and large-scale convective flows. The principal role of the ATLAS ACR observations will be in support of extended solar irradiance experiments on free-flying satellites. Annual in-flight comparison of observations by both ATLAS and free-flying experiments is an important part of sustaining the long-term precision of the climatological solar irradiance data base at the required + or - 0.1 percent level. Another role for ATLAS solar irradiance measurements will be establishment of the radiation scale at the solar total flux level in the International System of Units (SI). Two types of pyrheliometers, the ACR and SOLCON, will be directly intercompared during the ATLAS 1 mission. Addition of other sensors is planned for future reflights. Comparisons of solar observations by different pyrheliometers in the shuttle space environment will provide the most definitive experiment for determining their accuracy in defining the radiation scale at the solar total flux level

On the thermal conductivities of certain poor conductors

We have been engaged for several years in an attempt to measure, by the aid of the so called "Wall Method," the thermal conductivities of certain relatively poor conductors; and the variations of these conductivities with the temperature. ..

VLA-Max '91 tests of high energy flare physics

The potential for the Very Large Array (VLA) contributions during the coming maximum in solar activity is illustrated by unpublished observations of solar flares on 28 May, 8 June, 24 June, and 30 September 1988. Some of this data appears in the two papers by Willson et al., referenced in this article. The VLA can be used to spatially resolve flaring active regions and their magnetic fields. These results can be compared with simultaneous x ray and gamma ray observations from space. Examples are provided in which spatially separated radio sources are resolved for the pre-burst, impulsive and decay phases of solar flares. The emergence of precursor coronal loops probably triggers the release of stored magnetic energy in adjacent coronal loops. Noise storm enhancements can originate in large-scale coronal loops on opposite sides of the visible solar disk. An interactive feedback mechanism may exist between activity in high-lying 90 cm coronal loops and lower-lying 20 cm ones

Compact, variable, moving sources observed on the sun at 2 centimeters wavelength

The Very Large Array (VLA) was used to observe the active region AT 4508 in the C-configuration between 1530 and 2330 UT on June 4, 1984. The position of this region was N06 E57 at 1300 UT on this day. Followup observations were made between 1500 and 2300 UT on January 17, 1986 in the D-configuration. Observations were compared with Mt. Wilson magnetograms. Results are discussed

Islamic Activism and the Counterterror state: The Impact of the Securitised Lens on Hizb ut-Tahrir in Britain and Denmark

This project aims to answer the following research question: How has the development of a securitised lens impacted on Hizb ut-Tahrir in Britain and Denmark? To achieve this, it will explore the construction of a securitised lens, the impact of securitisation processes and the difference between responses within Hizb ut-Tahrir (HT) in Britain and Denmark through the following three sub-questions: 1. How do we know securitisation is an issue for Hizb ut-Tahrir in Britain and Denmark? 2. How can we understand securitisation as creating patterns of repression through perception? and 3. What are the long-term effects of this experience of perceived repression in the different contexts? It aims to do this through an approach that brings together the two theoretical discussions of social movement theories and securitisation theories through the nexus of repression. This enables the project to understand patterns of repression and mobilisation response, as well as respond to the limitations of both theoretical facets – social movement theory’s difficulty in understanding subtler, long-term and multi-spatial forms of repressions and securitisation theory’s disposition to assume power only travels downwards, from monolithic repressor to repressed, without an interactive response amongst all actors. The project took an empirical approach grounded in interaction with members, ex-members and those who operate in and around security – something considered particularly important in the study of an organisation that is semi-clandestine in its operation. This included attendance at demonstrations, public talks, da’wah stalls, Friday prayers and mosques talks, as well as halaqat (private study circles), social events, meetings at coffee shops, family meals, weddings and even participation in football practice, with fieldwork conducted between 2015 and 2018. Conceptually, the thesis is designed to fill gaps in contemporary study of the Islamic Activist organisation Hizb ut-Tahrir, updating the literature on an organisation that study has largely neglected in recent years but has become more relevant with the addition of discourse about ‘extremism’ in European counterterror. However, this thesis aims to offer a basic framework not just for understanding Hizb ut-Tahrir or even Islamic Activism, but for any forms of activism that are problematised under the increasing rubric of ‘extremism’, and explore how different groups from diverse movements change tactics in response to the threat or perception of repression by policies, practices or policing under the counterterror lens. It suggests the following findings: 1. Increased securitisation has been instrumental in the decline of HT in Britain and Denmark; 2. However, securitisation has had different effects in the UK than in Denmark, leading to adaption and institutionalisation in the British context and a continuation of contention in the Danish context; and 3. This is because different perceptions of repression have been created by the use of different securitising mechanisms, suggesting that the concept of counterterror securitisation needs to be reconsidered as a more interactive and diversified process, to account for the quanta of securitisation and mobilisation responses produced. The thesis is structured accordingly: Chapter one briefly outlines the questions to be addressed through the project. Chapter two explores the current literature on the topic and the gaps requiring redress. Chapter three details how the research was carried out and why such methodology was chosen. Chapter four outlines the theoretical tools used to understand what has been taking place. Chapter five details the case study of who is being researched, profiling Hizb ut-Tahrir ready for analysis. Chapter six explores the first sub-question: how do we know securitisation has become an issue for Hizb ut-Tahrir? Chapter seven responds to the second sub-question: how do we understand securitisation as creating patterns of repression for Hizb ut-Tahrir? Chapter eight analyses the final sub-question: what are the long-term effects of this experience of securitisation on Hizb ut-Tahrir and how can we understand this as an interactive process? Finally, chapter nine brings together all findings to determine the impact of the securitising lens on Hizb ut-Tahrir, examining alternative explanations and the limitation of this approach, as well as detailing the study’s implications for the field and drawing recommendations for future research

Verb agreement and case marking in Burushaski

Burushaski verb agreement and case marking phenomena are complex and have not been described adequately by any current theory of syntax. In particular, no explanation has yet been given as to why a variety of nominals can trigger agreement in the verbal prefix. In some cases the apparent subject triggers this agreement, in others the direct object appears to do so, in others the indirect object, in others the possessor of the direct object, in others a benefactive or source nominal. Also the constraints on the usage of ergative, absolutive and oblique case, and other indicators of grammatical relations on nominals, have been insufficiently characterized in the literature on Burushaski. In this paper I propose an account of these facts, and several others relating to Burushaski clause structure, within the framework of Relational Grammar

Measurement of Source Chaoticity for Particle Emission in Au+Au Collisions at sNN\sqrt{s_{NN}} = 130 GeV using 3-Particle HBT Correlations

Data from the first physics run at the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory from the STAR experiment have been analyzed using three-pion correlations to study whether pions are emitted independently at freezeout. We have made a high-statistics measurement of the three-pion correlation function and calculated the normalized three-particle correlator to obtain a quantitative measurement of the degree of chaoticity in the freeze-out environment.Comment: 4 pages, 4 figures. Plenary talk presented at Quark Matter 2002, Nantes, France, July 18-24, 200

Modeling Solar Lyman Alpha Irradiance

Solar Lyman alpha irradiance is estimated from various solar indices using linear regression analyses. Models developed with multiple linear regression analysis, including daily values and 81-day running means of solar indices, predict reasonably well both the short- and long-term variations observed in Lyman alpha. It is shown that the full disk equivalent width of the He line at 1083 nm offers the best proxy for Lyman alpha, and that the total irradiance corrected for sunspot effect also has a high correlation with Lyman alpha