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An OCR endorsed textbookTrust Ben Walsh to guide you through the new specification and motivate your students to excel with his trademark mix of engaging narrative and fascinating contemporary sources; brought to you by the market-leading History publisher and OCR's Publishing Partner for History. - Skilfully steers you through the increased content requirements and changed assessment model with a comprehensive, appropriately-paced course created by bestselling author Ben Walsh and a team of subject specialists - Deepens subject knowledge through clear, e

We are working with Cambridge Assessment International Education to gain endorsement for this title. New edition to match the revised Cambridge IGCSETM, IGCSE (9-1) and O Level syllabuses (0470/0977/2147) for examination from 2024. Rely on author Ben Walsh's bestselling approach to navigate through the syllabus content and help students acquire the skills they need. The book covers all the Key Questions and Focus Points for Core Content Option B 'The 20th century: International Relations since 1919' and selected depth studies: Germany, 1918-45; Russia, 1905-41; The USA, 1919-41. - Deepen understanding through clear and engaging text to build the content knowledge required by the course. - Develop analytical skills through carefully designed Focus Tasks on all the Focus Points or Key Questions from the syllabus. - Get a feel for the period and the issues through abundant source material that also ensures regular practice of source evaluation skills. - Remember historical facts better through memorable diagrams and timelines. - Consolidate learning with Focus on features suggesting how to tackle exam-style questions.

Abstract
With the increasing sophistication of real time sampling devices, research to objectively assess their performance is a priority. The International Sampling Comparison Group has embarked on a series of projects in association with other research groups. In Australia, a workplace sampler comparison study has commenced the collection of conventional and real time samples of inhalable and respirable dust, from host sites in the West Australian iron ore mining industry. The selected samplers are placed on a specially designed Workplace Atmosphere Multisampler (WAM) device which can host up to 12 samplers simultaneously, rotating at 3 revolutions a minute to reduce sampling biases. In this paper we report on the initial findings of matched pairs of each sampler, run for a minimum of 6 hours, over 28 sample days, which generated 168 matched pair data points. In addition, a particle size impactor, and bulk dust samples were collected to determine the particle size fraction. Data was collected with a trained and experienced occupational hygiene technician in accordance with recognised standards. Results will be presented from a series of conventional versus real time or near real time devices including HazDust 7204 with Inhalable Inlet, TSI AM520 with Respirable dust Cyclone, IOM + Foam plug PVC, Zephon disposable + Foam plug PVC, UPAS v2+ direct reading sampler + 37mm filter, and the Marple 8 stage Impactor.