282 research outputs found
It Really Is Just Trying to Help: The History of FASB and Its Role in Modern Accounting Practices
Influential Article Review - A New Approach to Rural Economic Growth in Pakistan's Rain-Fed Areas
This paper examines sustainable economic development. We present insights from a highly influential paper. Here are the highlights from this paper: The purpose of this article is to present a framework that could be used to achieve the objective of sustainable rural development in a community which is characterized by high numbers of smallholders, landless peasants, and unskilled or semi-skilled labor ultimately leading to low productivity and high rates of poverty. The study presents a design inspired by “Saemaul Undong” (New Village Movement) of South Korea. The proposed model is based on proposing a four-tier approach for the working of the village-level cooperatives which will be self-reliant through a network connection to the national and international markets. Existing studies and surveys in Punjab province of Pakistan have established that rural areas are often lacking essential facilities that affect the abilities of these areas to retain skilled manpower thus leading to resource drain and negatively impacting agricultural productivity. The proposed Village-City Model, “VCM,” was designed to strengthen the local infrastructure and built interest-based cooperatives to develop an environment which can sustain the benefits of higher productivity and translate these into better livelihoods. It is proposed that farmer-centered cooperatives with appropriate institutional arrangements could result in developing village-based cities where skilled manpower can exert better resource use efficiency, access to market coupled with rural finance schemes to enhance resource base and access to technology. The cooperatives experience is considered as a bitter experience in Pakistan. However, the analysis of failures of cooperatives in Pakistan revealed many bottlenecks which have been addressed through indigenization of Saemaul Undong
A cryogenic rotation stage with a large clear aperture for the half-wave plates in the Spider instrument
We describe the cryogenic half-wave plate rotation mechanisms built for and
used in Spider, a polarization-sensitive balloon-borne telescope array that
observed the Cosmic Microwave Background at 95 GHz and 150 GHz during a
stratospheric balloon flight from Antarctica in January 2015. The mechanisms
operate at liquid helium temperature in flight. A three-point contact design
keeps the mechanical bearings relatively small but allows for a large (305 mm)
diameter clear aperture. A worm gear driven by a cryogenic stepper motor allows
for precise positioning and prevents undesired rotation when the motors are
depowered. A custom-built optical encoder system monitors the bearing angle to
an absolute accuracy of +/- 0.1 degrees. The system performed well in Spider
during its successful 16 day flight.Comment: 11 pages, 7 figures, Published in Review of Scientific Instruments.
v2 includes reviewer changes and longer literature revie
Prospectus, February 9, 1983
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Modeling and characterization of the SPIDER half-wave plate
Spider is a balloon-borne array of six telescopes that will observe the
Cosmic Microwave Background. The 2624 antenna-coupled bolometers in the
instrument will make a polarization map of the CMB with approximately one-half
degree resolution at 145 GHz. Polarization modulation is achieved via a
cryogenic sapphire half-wave plate (HWP) skyward of the primary optic. We have
measured millimeter-wave transmission spectra of the sapphire at room and
cryogenic temperatures. The spectra are consistent with our physical optics
model, and the data gives excellent measurements of the indices of A-cut
sapphire. We have also taken preliminary spectra of the integrated HWP, optical
system, and detectors in the prototype Spider receiver. We calculate the
variation in response of the HWP between observing the CMB and foreground
spectra, and estimate that it should not limit the Spider constraints on
inflation
Changes in Personal Networks of Women in Residential and Outpatient Substance Abuse Treatment
Changes in personal network composition, support and structure over 12 months were examined in 377 women from residential (n=119) and intensive outpatient substance abuse treatment (n=258) through face-to-face interviews utilizing computer based data collection. Personal networks of women who entered residential treatment had more substance users, more people with whom they had used alcohol and/or drugs, and fewer people from treatment programs or self-help groups than personal networks of women who entered intensive outpatient treatment. By 12 months post treatment intake, network composition improved for women in residential treatment; however, concrete support was still lower and substance users still more prevalent in their networks. Network composition of women in outpatient treatment remained largely the same over time. Both groups increased cohesiveness within the network over 12 months. Targeting interventions that support positive changes in personal networks may heighten positive long term outcomes for women entering treatment
Artificial intelligence: Guidance for clinical imaging and therapeutic radiography workforce professionals.
Pointing control for the SPIDER balloon-borne telescope
We present the technology and control methods developed for the pointing
system of the SPIDER experiment. SPIDER is a balloon-borne polarimeter designed
to detect the imprint of primordial gravitational waves in the polarization of
the Cosmic Microwave Background radiation. We describe the two main components
of the telescope's azimuth drive: the reaction wheel and the motorized pivot. A
13 kHz PI control loop runs on a digital signal processor, with feedback from
fibre optic rate gyroscopes. This system can control azimuthal speed with <
0.02 deg/s RMS error. To control elevation, SPIDER uses stepper-motor-driven
linear actuators to rotate the cryostat, which houses the optical instruments,
relative to the outer frame. With the velocity in each axis controlled in this
way, higher-level control loops on the onboard flight computers can implement
the pointing and scanning observation modes required for the experiment. We
have accomplished the non-trivial task of scanning a 5000 lb payload
sinusoidally in azimuth at a peak acceleration of 0.8 deg/s, and a peak
speed of 6 deg/s. We can do so while reliably achieving sub-arcminute pointing
control accuracy.Comment: 20 pages, 12 figures, Presented at SPIE Ground-based and Airborne
Telescopes V, June 23, 2014. To be published in Proceedings of SPIE Volume
914
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