TETRA is the new digital standard designed for the professional mobile radio communications market. Unlike its counterpart GSM, in the personal telecommunications market, TETRA includes a wide range of features tailored for professional user requirements. It makes the best possible use of the radio spectrum through sharing of radio resources among users, on demand, and exploits the advantages of digital transmission. For professional user groups (e.g. police forces, emergency services, utility plants, transport etc.) TETRA provides a secured, reliable and cost effective means of communication with its capability of handling multimedia transmissions. As a comprehensive introduction to TETRA, this timely publication includes:

• Detailed discussion of public and private mobile communications domain
• Architecture, components and services of TETRA and
• Design and operational aspects of the system

Physical and chemical studies of the earth and planets along with their sur roundings are now developing very rapidly. As these studies are of essentially international character, many international conferences, symposia, seminars and workshops are held every year. To publish proceedings of these meetings is of course important for tracing development of various disciplines of earth and plane tary sciences though publishing is fast getting to be an expensive business. It is my pleasure to learn that the Center for Academic Publications Japan and the Japan Scientific Societies Press have agreed to undertake the publication of a series "Advances in Earth and Planetary Sciences" which should certainly become an important medium for conveying achievements of various meetings to the aca demic as well as non-academic scientific communities. It is planned to publish the series mostly on the basis of proceedings that appear in the Journal of Geomagnetism and Geoelectricity edited by the Society 'Of Terrestrial Magnetism and Electricity of Japan, the Journal of Physics of the Earth by the Seismological SOCiety of Japan and the Volcanological Society of Japan, and the Geochemical Journal by the Geochemical Society of Japan, although occasional volumes of the series will include independent proceedings. Selection of meetings, of which the proceedings will be included in the series, will be made by the Editorial Committee for which I have the honour to work as the General Editor."

'A privilege to read, a pleasure to endorse' PROFESSOR TANYA BYRON 'This book completely bowled me over' DOMINIC DAVIES 'A super comprehensive book' MEG-JOHN BARKER To be queer is to feel different - a felt sense that you don't fit in. This can be alienating and difficult and lead to mental health challenges and lower wellbeing throughout life. Using a range of therapeutic approaches, this comprehensive, down-to-earth self-help workbook is designed to be your personal mental health resource. It is filled with techniques and activities you can read, tailor and 'pick and mix' to improve your wellbeing as a queer person, at your pace. The workbook is split into two sections - the first part focusses on laying the groundwork by exploring identity, psychological wellbeing, and mental health experiences in order to situate mental health challenges in context and improve overall mental health. The second half hones in on ideas and techniques applicable to specific challenges and situations. It explores difficult topics such as anxiety, low self-esteem, eating disorders, self-harm, suicidal ideation, shame, trauma, substance abuse, sleep, and low mood, all whilst maintaining a focus on your needs as a queer individual. Empowering and reassuring, and written by an experienced queer mental health practitioner, this one-of-a-kind workbook will help you to flourish as a queer person and begin to overcome any challenge.

Physical and chemical studies of the earth and planets along with their sur roundings are now developing very rapidly. As these studies are of essentially international character, many international conferences, symposia, seminars and workshops are held every year. To publish proceedings of these meetings is of course important for tracing development of various disciplines of earth and plane tary sciences though publishing is fast getting to be an expensive business. It is my pleasure to learn that the Center for Academic Publications Japan and the Japan Scientific Societies Press have agreed to undertake the publication of a series "Advances in Earth and Planetary Sciences" which should certainly become an important medium for conveying achievements of various meetings to the aca demic as well as non-academic scientific communities. It is planned to publish the series mostly on the basis of proceedings that appear in the Journal of Geomagnetism and Geoelectricity edited by the Society 'Of Terrestrial Magnetism and Electricity of Japan, the Journal of Physics of the Earth by the Seismological SOCiety of Japan and the Volcanological Society of Japan, and the Geochemical Journal by the Geochemical Society of Japan, although occasional volumes of the series will include independent proceedings. Selection of meetings, of which the proceedings will be included in the series, will be made by the Editorial Committee for which I have the honour to work as the General Editor."

This book is a comprehensive treatment of fine particle magnetism and the magnetic properties of rocks. Starting from atomic magnetism and magnetostatic principles, the authors explain why domains and micromagnetic structures form in ferrimagnetic crystals and how these lead to magnetic memory in the form of thermal, chemical and other remanent magnetizations. One chapter is devoted to practical tests of domain state and paleomagnetic stability. Another deals with pseudo-single-domain magnetism, i.e., particles that contain domain walls but behave like a single domain. The final four chapters place magnetism in the context of igneous, sedimentary, metamorphic, and extraterrestrial rocks. This book will appeal to researchers in the earth sciences, physics, and engineering.