We present compositions, including REEs determined by ion microprobe, of apatite and whitlockite in lunar rock assemblages rich in incompatible trace elements. Total concentrations of REE oxides in whitlockites range from 9-13 wt%, and those in apatites range from 0.15 to 1 wt%. Ratios of REE concentrations in whitlockite to those in coexisting apatite range from 10 to 60. The distribution of M...

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since the collapse of the soviet :union:, russia has been affected by intensifying regional and international developments than ever before. because of new opportunities and threats caused by these developments, russia faced with the problem of structural adoption whit systemic new realities, accompanying whit redefinition of its position and review of foreign policy approaches. conceptual and ...

BACKGROUND Recently alternative therapies such as the use of diode laser therapy have been introduced for recurrent herpes labial infection. The aim of this study was to evaluate the effectiveness of diode laser for treatment of recurrent herpes labialis. MATERIAL AND METHODS This was single-blind randomized clinical trial to evaluate the efficacy of diode laser for the treatment of recurrent...

Throughout history, the ongoing technological progress has caused the economy to change in many aspects; furthermore, at times it triggered the dawn of a new era. In the 1980s, this happened for the last time and the digital economy has emerged over the last decades. Since then, the significance of approaches to technology enhanced learning (TEL) has increased rapidly. However, the relations be...

Reflection and collaborative reflection are common means for learning at work. Based on four studies on tool supported collaborative reflection, which created insights on barriers and opportunities for such support, we describe a concept of augmenting tools with reflection and a prototype showing how the concept can be implemented in typical TEL environments.

Motivational and affective aspects have long been neglected in research and development of technology enhanced learning (TEL) solutions, but it is now increasingly recognized that they are key to acceptance and sustainable success. However, the consideration of these aspects still suffers from fragmented research activities that are in between established disciplines. We summarize the results f...