Resistive switching in optoelectronic III-V materials based on deep traps.

Resistive switching random access memories (ReRAM) are promising candidates for energy efficient, fast, and non-volatile universal memories that unite the advantages of RAM and hard drives. Unfortunately, the current ReRAM materials are incompatible with optical interconnects and wires. Optical signal transmission is, however, inevitable for next generation memories in order to overcome the capacity-bandwidth trade-off. Thus, we present here a proof-of-concept of a new type of resistive switching realized in III-V semiconductors, which meet all requirements for the implementation of optoelectronic circuits. This resistive switching effect is based on controlling the spatial positions of vacancy-induced deep traps by stimulated migration, opening and closing a conduction channel through a semi-insulating compensated surface layer. The mechanism is widely applicable to opto-electronically usable III-V compound semiconductors.

[Comparative drug therapy study with scintigraphic control research]. / Vergleichende Arzneimittelstudie mit szintigraphischen Kontrolluntersuchungen.

By means of the 99m-Tc-pertechnitate joint scintigraphy the authors try to document the effect of antirheumatic drugs in 62 patients with rheumatoid arthritis. By measuring the changes of the synovial blood circulation, conclusions are drawn as to the degree of inflammation. When trying to make a quantitative assessment of the changes of inflammation as compared with a standardised reference region, particularly on the wrist joint, it was found that the activity increased on the reference region on the forearm and that proved to be a possible source of error. The reason for this may be the early involvement of vessels in rheumatoid arthritis. For further calculations it will be necessary to set up joint and radio-nuclide-specific standards as reference points.

Comparative study of quantitating 99mTc-EHDP uptake in sacroiliac scintigraphy.

Quantitative sacroiliac (SI) scintigraphy was performed 3 h after an i.v. injection of 16 mCi 99mTc-EHDP. The resulting images were recorded and processed and on an ON data system 150. Five technical approaches for objective digital assessment of abnormal uptake of the tracer at the sacroiliac joints were employed. SI indexes from the ratio of radioactivity in the SI joints and in the os sacrum, determined either by a region-of-interest technique or by a profile-scan technique measuring the maxima of the curve over a defined base line, proved to be the best parameters in discriminating normal from abnormal uptake of the radiotracer in the SI joints. The quantitative scan technique appears to be useful as an objective tool in interpreting SI scans.