787 research outputs found
Refined class number formulas and Kolyvagin systems
We use the theory of Kolyvagin systems to prove (most of) a refined class
number formula conjectured by Darmon. We show that for every odd prime ,
each side of Darmon's conjectured formula (indexed by positive integers ) is
"almost" a -adic Kolyvagin system as varies. Using the fact that the
space of Kolyvagin systems is free of rank one over , we show
that Darmon's formula for arbitrary follows from the case , which in
turn follows from classical formulas
Thermodynamics of nuclei in thermal contact
The behaviour of a di-nuclear system in the regime of strong pairing
correlations is studied with the methods of statistical mechanics. It is shown
that the thermal averaging is strong enough to assure the application of
thermodynamical methods to the energy exchange between the two nuclei in
contact. In particular, thermal averaging justifies the definition of a nuclear
temperature.Comment: 9 pages, 1 figur
On the Effect of Inband Signaling and Realistic Channel Knowledge on Dynamic OFDM-FDMA Systems
Dynamically assigning subcarriers of OFDM systems to multiple different terminals in a cell has been shown to be beneficial in terms of different transmission metrics. However, the success of such a scheme depends on the ability of the access point to inform terminals of their newest subcarrier assignments as well as on the accuracy of the channel state information used to generate new assignments. It is not clear whether the overhead required to implement these two system abilities consumes all of the potential performance increase possible by dynamically assigning subcarriers
Complexer-YOLO: Real-Time 3D Object Detection and Tracking on Semantic Point Clouds
Accurate detection of 3D objects is a fundamental problem in computer vision
and has an enormous impact on autonomous cars, augmented/virtual reality and
many applications in robotics. In this work we present a novel fusion of neural
network based state-of-the-art 3D detector and visual semantic segmentation in
the context of autonomous driving. Additionally, we introduce
Scale-Rotation-Translation score (SRTs), a fast and highly parameterizable
evaluation metric for comparison of object detections, which speeds up our
inference time up to 20\% and halves training time. On top, we apply
state-of-the-art online multi target feature tracking on the object
measurements to further increase accuracy and robustness utilizing temporal
information. Our experiments on KITTI show that we achieve same results as
state-of-the-art in all related categories, while maintaining the performance
and accuracy trade-off and still run in real-time. Furthermore, our model is
the first one that fuses visual semantic with 3D object detection
Chinese and American Perceptions on Nonprofit Organizational Effectiveness
Dynamically assigning sub-carriers of orthogonal frequency division multiplexing (OFDM) systems to multiple different terminals in a cell has been shown to be beneficial in terms of different transmission metrics. The success of such a scheme, however depends on the ability of the access point to inform terminals of their newest sub-carrier assignments as well as on the accuracy of the channel state information used to generate new assignments. It is not clear whether the overhead required to implement these two functions consumes all of the potential performance increase possible by dynamically assigning subcarriers. In this paper, a specific MAC structure is selected enabling the operation of a dynamic OFDM system, incorporating a signalling scheme for dynamically assigned sub-carriers. Based on this structure, we study the overhead required for a dynamic sub-carrier scheme; a static variant that serves as a comparison case. We investigate the performance difference of these two schemes for various scenarios where at first signalling and then realistic channel knowledge is added to the system model. Average throughput and goodput per terminal serve as figures of merit; the number of terminals in the cell, the transmission power per sub-carrier, the delay spread and the movement speed of the terminals are varied. We find that a realistic overhead model decreases the performance of both static and dynamic schemes such that the overall ratio favours in all cases except for higher speeds the dynamic rather than the static scheme especially in realistic system environments.QC 20131129</p
De quibusdam Aeschyli Choephororum locis
https://repository.brynmawr.edu/digitizedbooks/1086/thumbnail.jp
De quibusdam Aeschyli Choephororum locis
https://repository.brynmawr.edu/digitizedbooks/1086/thumbnail.jp
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Thymidine kinase mRNA and protein levels during myogenic with drawal from the cell cycle : identification of an mRNA-independent regulatory mechanism
Replication associated protein and enzyme activity levels increase as cells enter
S-phase of the cell cycle and diminish as cells leave S-phase. Accordingly, replication
associated functions decrease as myoblasts withdraw from the cell cycle to terminally
differentiate. In an effort to understand signals effecting growth associated expression
of genes, the molecular mechanism controlling declining thymidine kinase (TK) activity
levels during myogenic withdrawal from the cell cycle was investigated. Initially, the
hypothesis that TK was regulated at the level of mRNA was investigated both in vivo
and in an in vitro myoblast cell culture system. Qualitatively, TK mRNA declined by a
transcriptional mechanism. However, quantitative comparison of the decline in TK
mRNA and TK activity revealed TK activity was regulated by a mRNA-independent
mechanism. Consequently, the hypothesis that TK activity was regulated by a
posttranslational mechanism was tested. Antibodies against TK protein were derived
and used to demonstrate, via immunoblot and immunoprecipitation experiments, the
existence of a translational or protein degradational mechanism. The possible
contribution of posttranslational modulation of TK activity could not be rigorously
eliminated.
A second approach to understanding the mechanism of decline of TK activity
during myogenic withdrawal from the cell cycle involved further localization of intragenic
cis-acting regulatory elements. Regulation of TK activity was monitored in myoblasts
transformed with intron deletion mutants of TK. Introns were inconsequential to
regulation of TK activity. Thus, cis-acting regulatory elements mediating the decline in
TK activity were within the protein coding region, consistent with the translational or
protein degradational level of regulation. Quantitative evaluation of TK mRNA
regulation in myoblasts transformed with promoter switch, 3' replacement, and intron
deletion mutants also localized cis-acting elements mediating the transcriptional decline
in TK mRNA to the protein coding region. However, the controversy surrounding the nature of the heterologous promoters used, the smallfold and variable decline in TK
mRNA, the possibility of redundant control elements, and the unusual location of the
transcriptional regulatory element cast doubt on this conclusion. Two general
mechanisms for controlling TK mRNA levels were proposed.
The available set of intron deletion mutants was used to test the popular
hypothesis that introns are essential for expression of mRNA. Quantitative evaluation
of TK mRNA expression in mouse fibroblasts transformed with full length TK genes or
intron deletion mutants revealed no significant difference in expression. Thus introns
were inconsequential to expression of TK mRNA in fibroblasts
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