1,148 research outputs found
On the Planetary acceleration and the Rotation of the Earth
We have developed a model for the Earth rotation that gives a good account
(data) of the Earth astronomical parameters. These data can be compared with
the ones obtained using space-base telescopes. The expansion of the universe
has an impact on the rotation of planets, and in particular, the Earth. The
expansion of the universe causes an acceleration that is exhibited by all
planets.Comment: 8 Latex page
A mass-extended 't Hooft-Nobbenhuis complex transformations and their consequences
We have extended the 't Hooft-Nobbenhuis complex transformations to include
mass. Under these new transformations, Schrodinger, Dirac, Klein-Gordon and
Einstein general relativity equations are invariant. The non invariance of the
cosmological constant in Einstein field equations dictates it to vanish thus
solving the longstanding cosmological constant problem.Comment: 6 LateX pages, no figure
On the generalized continuity equation
A generalized continuity equation extending the ordinary continuity equation
has been found using quanternions. It is shown to be compatible with Dirac,
Schrodinger, Klein-Gordon and diffusion equations. This generalized equation is
Lorentz invariant. The transport properties of electrons are found to be
governed by Schrodinger-like equation and not by the diffusion equation.Comment: 9 Latex pages, no figure
Cosmic Acceleration With A Positive Cosmological Constant
We have considered a cosmological model with a phenomenological model for the
cosmological constant of the form \Lambda=\bt\fr{\ddot R}{R}, \bt is a
constant. For age parameter consistent with observational data the Universe
must be accelerating in the presence of a positive cosmological constant. The
minimum age of the Universe is , where is the present Hubble
constant. The cosmological constant is found to decrease as . Allowing
the gravitational constant to change with time leads to an ever increasing
gravitational constant at the present epoch. In the presence of a viscous fluid
this decay law for is equivalent to the one with () provided \alpha=\fr{\bt}{3(\bt-2)}. The
inflationary solution obtained from this model is that of the de-Sitter type.Comment: a more revised versio
Effect of Strategic Human Resource Management Practices on Organizational Commitment
The research investigates the association between strategic human resource management techniques across many dimensions (Training, Performance appraisal, Selection, and compensation) and organizational commitment at the Middle East Food Trading Company in the Kingdom of Bahrain. The study selected and employed a descriptive quantitative research approach to fulfill the study goals via the use of a survey questionnaire designed for data collecting. The target sample consisted of personnel from the Middle East Food Trading Company in the Kingdom of Bahrain, with a total of 105 participants in this research. The findings revealed that strategic human resource management techniques (Training, Selection, and Compensation) had a statistically significant association with organizational commitment at the level of significance (0.05%). The data also revealed that the association between performance appraisal and organizational commitment was insignificant. The research proposed that the Middle East Food Trading Company combine and implement numerous training activities at all levels in respect to the varied practices of strategic human resources
Operational and denotational semantics of prolog
AbstractA Vienna Definition Language operational semantics of PROLOG, which includes the cut, the database, and the extra-logical operations, is presented. This semantics serves as the basis for deriving a denotational-continuation-style semantics of PROLOG through a systematic transformation of the operational semantics by a method described by Berry
Terahertz PHASR Scanner with 2 kHz, 100 picosecond Time-Domain Trace Acquisition Rate and an Extended Field-of-View Based on a Heliostat Design
Recently, we introduced a Portable HAndheld Spectral Reflection (PHASR)
Scanner to allow THz Time-Domain Spectroscopic (THz-TDS) imaging in clinical
and industrial settings using a fiber-coupled and alignment-free telecentric
beam steering design. The key limitations of the version 1.0 of the PHASR
Scanner were its field-of-view and speed of time-domain trace acquisition. In
this paper, we address these limitations by introducing a heliostat geometry
for beam scanning to achieve an extended field-of-view, and by reconfiguring
the ASynchronous OPtical Sampling (ASOPS) system to perform Electronically
Controlled OPtical Sampling (ECOPS) measurements. The former change improved
the deflection range of the beam, while also drastically reducing the coupling
of the two scanning axes, the combination of which resulted in a larger than
four-fold increase in the FOV area. The latter change significantly improves
the acquisition speed and frequency domain performance simultaneously by
improving measurement efficiency. To accomplish this, we characterized the
non-linear time-axis sampling behavior of the electro-mechanical system in the
ECOPS mode. We proposed methods to model and correct the non-linear time-axis
distortions and tested the performance of the high-speed ECOPS trace
acquisition. Therefore, here we introduce the PHASR Scanner version 2.0, which
is capable of imaging a 4027 mm FOV with 2000 traces per second
over a 100 picosecond TDS range. This new scanner represents a significant leap
towards translating the THz-TDS technology from the lab bench to the bedside
for real-time clinical imaging applications.Comment: 15 pages; submitted to IEEE Transactions on Terahertz Science and
Technolog
Intravenous Formulation of HET0016 Decreased Human Glioblastoma Growth and Iimplicated Survival Benefit in Rat Xenograft Models
Glioblastoma (GBM) is a hypervascular primary brain tumor with poor prognosis. HET0016 is a selective CYP450 inhibitor, which has been shown to inhibit angiogenesis and tumor growth. Therefore, to explore novel treatments, we have generated an improved intravenous (IV) formulation of HET0016 with HPssCD and tested in animal models of human and syngeneic GBM. Administration of a single IV dose resulted in 7-fold higher levels of HET0016 in plasma and 3.6-fold higher levels in tumor at 60 min than that in IP route. IV treatment with HPssCD-HET0016 decreased tumor growth, and altered vascular kinetics in early and late treatment groups (p \u3c 0.05). Similar growth inhibition was observed in syngeneic GL261 GBM (p \u3c 0.05). Survival studies using patient derived xenografts of GBM811, showed prolonged survival to 26 weeks in animals treated with focal radiation, in combination with HET0016 and TMZ (p \u3c 0.05). We observed reduced expression of markers of cell proliferation (Ki-67), decreased neovascularization (laminin and alphaSMA), in addition to inflammation and angiogenesis markers in the treatment group (p \u3c 0.05). Our results indicate that HPssCD-HET0016 is effective in inhibiting tumor growth through decreasing proliferation, and neovascularization. Furthermore, HPssCD-HET0016 significantly prolonged survival in PDX GBM811 model
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