Now showing items 21-30 of 208
Curvature and flatness in a Brans-Dicke universe
(Elsevier, 1994-06-27)
The evolution of a universe with Brans-Dicke gravity and nonzero curvature is investigated here. We find solutions to the equations of motion during the radiation dominated era. In a Friedman-Robertson-Walker cosmology we ...
Multiple Compton scattering gamma ray imaging camera
(Elsevier, 1990-12-20)
With the recent advances in position sensing detectors, a compact, multiple layered, Compton scattering gamma ray imaging camera has been investigated for technological feasibility. Beginning from Kamea and Hanada's recent ...
A Flexible Spline Model of the Spin Echo with Applications to Estimation of the Spin-Spin Relaxation Time
(Elsevier, 1994-12)
Under weak mathematical assumptions, the distortion due to B0 inhomogeneity is shown to take the form of a characteristic function, which is the Fourier transform of a probability distribution, A model of the spin echo is ...
Recovery and purification of no-carrier-added [18F]fluoride with bistrimethylsilylsulfate (BTMSS)
(Elsevier, 1991)
No-carrier-added trimethylsilyl[18F]fluoride (TMS[18F]F) was rapidly liberated from a variety of dry supports containing unreactive [18F]fluoride by simply heating with neat bistrimethylsilylsulfate. The supports included ...
In vivo 31 P MRS evaluation of ganciclovir toxicity in C6 gliomas stably expressing the herpes simplex thymidine kinase gene
(John Wiley & Sons, Ltd., 1996-12)
Phosphorus MRS was evaluated as a monitor of tumour therapeutic response to the herpes simplex virus thymidine kinase suicide gene therapy paradigm. In vivo 31 P spectra were obtained from subcutaneous rat C6 gliomas ...
Photobleaching with a subnanosecond laser flash
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1994-06)
In standard fluorescence recovery after photobleaching (FRAP) applications for measuring lateral diffusion rates and adsorption/desorption kinetics of fluorescent molecules at biological or model membranes, irreversible ...
[mu]-e conversion in nuclei and Z' physics
(Elsevier, 1993-11-22)
Together with the existence of new neutral gauge bosons, models based on extended gauge groups (rank > 4) often predict also new charged fermions. A mixing of the known fermions with new states with exotic weak-isospin ...
D-band (110-170 GHz) InP gunn devices
(Elsevier, 1993-11)
This paper reports on the development of InP Gunn sources for operation in the D-band (110-170 GHz). n+-n-n+ structures with flat doping as well as graded doping profiles have been considered. Oscillations were obtained ...
Aqueous carbonic acid: A readily removable electrolyte for the recovery of [18F]fluoride from anion exchange resins
(Elsevier, 1991)
[18F]Fluoride was recovered from [18O]target water in high yield by trapping it on a microcolumn of an anion exchange resin (20 mg Dowex 1 x 8, 400 mesh) and subsequent elution of the column (in the reverse direction) ...