Über psychologische Berufs-Eignungsprüfungen für Verkehrsberufe. Eine Begutachtung ihres theoretischen und praktischen Wertes erläutert durch eine Untersuchung von Strassenbahnführern,

"Aus dem Physiologischen Institut und aus dem Institut für Gerichtliche Medizin der Universität Kiel."

Making the office pay : tested office plans, methods and systems that make for better results from everyday routine.

Mode of access: Internet.

Newer ideals of peace,

"Parts of two chapters have been published before in the form of addresses, and two others as articles in the North American review and in the American journal of sociology."--Pref. note.

Psychological tests applied to factory workers,

Mode of access: Internet.

Les salaires ouvriers et la richesse nationale /

"La méthode de Taylor et le salaire moderne. Premiers éléments d'une théorie du salaire. Application à la fabrication du matériel de guerre."

Ratios of staff to line personnel in the automotive parts manufacturing industry /

Mode of access: Internet.

Annual report to the President & Congress : building a competitive America.

Mode of access: Internet.

100%

"The practical magazine of efficient management."

American problems of reconstruction;

Mode of access: Internet.

Management.

Mode of access: Internet.

Bulletin of the Taylor Society.

Industrial arts index

Wage incentive methods, their selection, installation and operation,

"References for additional cases" at end of chapter 19.

Improving the efficiency of high power piezoelectric transducers for industrial applications

Most high-power ultrasound applications are driven by two-level inverters. However, the broad spectral content of the two-level pulse results in undesired harmonics that can decrease the performance of the system significantly. On the other hand, it is crucial to excite the piezoelectric devices at their main resonant frequency in order to have maximum energy conversion. Therefore a high-quality, low-distorted power signal is needed to excite the high-power piezoelectric transducer at its resonant frequency. This study proposes an efficient approach to develop the performance of high-power ultrasonic applications using multilevel inverters along with a frequency estimation algorithm. In this method, the resonant frequencies are estimated based on relative minimums of the piezoelectric impedance frequency response. The algorithm follows the resonant frequency variation and adapts the multilevel inverter reference frequency to drive an ultrasound transducer at high power. Extensive simulation and experimental results indicate the effectiveness of the proposed approach.

Determinants of eco-efficiency in the Chinese industrial sector

This study measures productive inefficiency within the context of multi-environmental pollution (eco-efficiency) in the Chinese industrial sector. The weighted Russell directional distance model is applied to measure eco-efficiency using production technology. The objective is to clarify how external factors affect eco-efficiency. The major findings are that both foreign direct investment and investment for pollution abatement improve eco-efficiency as measured by air pollutant substances. A levy system for wastewater discharge improves eco-efficiency as measured by wastewater pollutant substances. However, an air pollutant levy does not significantly affect eco-efficiency as measured by air pollutants.