Work Of Different Researchers Research Articles

Phases in the PZT Ceramics

Many peculiarities of the piezoelectric PZT ceramics were explained in the author's papers. Later, many works of different researchers appeared. They either confirmed or disputed the author's statements. Results and conclusions of these papers are discussed below. It can be seen that now there exists a rather clear qualitative picture of physical phenomena in the PZT ceramics, which can be developed further.

Phases in the PZT Ceramics

Many peculiarities of the piezoelectric PZT ceramics were explained in the author's papers. Later, many works of different researchers appeared. They either confirmed or disputed the author's statements. Results and conclusions of these papers are discussed below. It can be seen that now there exists a rather clear qualitative picture of physical phenomena in the PZT ceramics, which can be developed further.

Correlation of TBM and drilling machine performances with rock brittleness

The correlations between three different methods of measuring brittleness and both drillability and borability were statistically investigated using the raw data obtained from the experimental works of different researchers. Strong exponential relationships between the penetration rates of tunnel boring machine (TBM) and the brittleness of B 1 (the ratio of compressive strength to tensile strength) and B 2 (the ratio of compressive strength minus tensile strength to compressive strength plus tensile strength) were found. There is no correlation between the penetration rates of the diamond drilling tool and the brittleness values. Strong exponential correlations exist between the penetration rates of rotary drills and the brittleness of B 1 and B 2. However, no correlation between the penetration rate of rotary drills and the brittleness of B 3 (the product of percentage of fines in impact strength test and compressive strength) was found. The penetration rate of percussive drills does not exhibit a correlation with the brittleness of B 1 and B 2, but the penetration rate of percussive drills is strongly correlated with the brittleness of B 3. It was concluded that each method of measuring brittleness has its usage in rock excavation depending on practical utility.

A comparison of some aspects of structured and unstructured psychiatric interviews.

The author presents the results of a comparison between a standardized interviewing instrument and the traditional free-style medical interview that involved two groups of interviewers. The author's ratings of their conduct of the interviews, their styles, and their points of emphasis indicated that the standardized instrument was more comprehensive in its coverage of psychiatric pathology. On the other hand, the free-style interview allowed significant individual variation in emphasis, which contributes to differences among observers and impedes comparability of the work of different researchers.