Cerebral Optical Centres

Optical Monitoring of Cerebral Microcirculation

The cerebral microcirculation consists of a complex network of small blood vessels that support nerve cells with oxygen and nutrition. The blood flow and oxygen delivery in the microcirculatory blood vessels are regulated through mechanisms which may be influenced or impaired by disease or brain damage resulting from conditions such as brain tumors, traumatic brain injury or subarachnoid hemorr...

Community Centres

Health centres.

In one Inner London health district many doctors seemed reluctant to work in health centres. To investigate the reasons, 44 general practitioners in two matched groups were inter¬ viewed. Those working in health centres appre¬ ciated the advantages of pleasant premises and the presence of a primary health care team. Other doctors believed health centres were dis¬ liked by patients, were bureauc...

Magneto-optical properties of the excited state of F centres in some alkali-halides

The orbital g-factor and the spin-orbit splittings of the first excited state of F-centres are measured in NaCl, NaBr, KBr and KF crystals by observing absorption and magnetic circular dichroism at various temperatures and using the moments method. Our experimental results and others are compared with Harker’s theoretical values. LE JOURNAL DE PHYSIQUE TOME 38, OCTOBRE 1977, Classification Phys...

Optical properties and transformation mechanism of oxygen centres and their aggregates in CaF2 crystals

Oxygen-vacancy dipoles and dimers in CaF2 crystals have been studied ab initio at DFT level and with the shell model using pair potentials. The calculated dipole reorientation barrier is 0.64 eV and the activation energy for diffusion of the dipoles is 1.61 eV. Optical absorption of O2--VA dipole have been calculated with TD DFT and identified with experimental absorption bands, which appeared ...