A sensitive, systematic search for feeble, macroscopic forces arising from the exchange of hypothetical ultra-low-mass bosons was made by observing the differential acceleration of two different test body pairs toward two different sources. Our differential accelerometer —a highly symmetric, continuously rotating torsion balance —incorporated several innovations that effectively suppressed syst...

Introduction Two-dimensional accelerated imaging [1] with acceleration factors as high as R = 8 has been applied successfully in contrastenhanced MR angiography (CE-MRA) of the brain [2, 3] and calves [4]. A key element of this implementation has been the use of multielement receiver coils which are designed for the targeted anatomic region. Multi-element coils for brain MRI are available on co...

Body-fixed motion sensors have been applied for the assessment of sit-to-stand (STS) performance. However, the accuracy and concurrent validity of sensor-based estimations of the body's center of mass (CoM) motion during STS are unclear. Therefore, this study investigated the accuracy and concurrent validity of sensor-based measures of CoM motion during STS in older adults. Accuracy and concurr...

The standard description of Fermi acceleration, developing in a class of time-dependent billiards, is given in terms of a diffusion process taking place in momentum space. Within this framework, the evolution of the probability density function (PDF) of the magnitude of particle velocities as a function of the number of collisions n is determined by the Fokker-Planck equation (FPE). In the lite...

It is known that sarcomas induced in mice with 3-methylcholanthrene (MCA) bear tumor-specific antigens which evoke specific immune responses when transplanted to isogenic animals. In this study, MCA-induced sarcomas were transplanted to iso genic C3H mice and the effect of immune suppression by wholebody X-irradiation on tumor growth was examined. The role of radiation dose, interval between ir...

This paper explains the relationship between two existing representations of rigid-body acceleration in a 6-D vector: conventional acceleration, which is the concatenation of two 3-D acceleration vectors, and spatial acceleration, which is the time derivative of a 6-D velocity vector. The two are materially different and obey different composition rules. In particular, spatial accelerations beh...

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The discoveries of the GZK cutoff with the HiRes and Auger Observatories and the discovery by Auger of clustering of > ∼ 60 EeV ultra-high energy cosmic rays (UHECRs) towards nearby ( < ∼ 75 Mpc) AGNs along the supergalactic plane establishes the astrophysical origin of the UHECRs. The likely sources of the UHECRs are gamma-ray bursts and radio-loud AGNs because: (1) they are extragalactic; (2)...

1550-7998=20 We investigate the recent suggestions by Barausse et al. and Kolb et al. that the acceleration of the universe could be explained by large superhorizon fluctuations generated by inflation. We show that no acceleration can be produced by this mechanism. We begin by showing how the application of Raychaudhuri equation to inhomogeneous cosmologies results in several ‘‘no go’’ theorems...