HOMEWORK EXAM 3: Chapter 19: The half life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175 years later? Answer 0.166 0.125 0.062 here 0.015 Which relation is not correct? Answer 11p = 11H = proton 0-1e = 0-1β = electron here +10e = +10β= positron 10n = neutron As a result of beta decay‚ the product nucleus is Answer one atomic number lower than the original element. two atomic number
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Introduction Discovered by Georg Wittig in 1954‚ the Wittig reaction is a robust organic synthesis method for preparing stereospecific alkenes. In general‚ Wittig reactions involve an aldehyde or ketone and a Wittig reagent (triphenylphosphonium ylide) and result in the formation of an alkene product and triphenylphosphine oxide (side product). Stereospecific alkene products can be synthesized by adjusting the reaction reagents and conditions. In the 60 years since the Wittig reaction was discovered
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ensure that they are in good condition. In pediatric dentistry‚ there are stainless steel crowns (SSCs)‚ Composite Resin or tooth colored fillings‚ X-rays‚ dental cleaning‚ fluoride‚ pulp treatment‚ extractions‚ sealants‚ and space maintainers. A stainless steel crown‚ also known as SSCs are used to restore the teeth that are badly decayed to hold white fillings. When a tooth decays‚ there can be extensive damage to the damage to the enamel (hard outer layer)‚ dentin (middle layer)‚ and sometimes
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1996 – Total biogas production: 7.7 million m3/year – Digester volume: 2 * 3700 m3 – Upgraded biogas delivered to vehicles (97% methane): 4.7 million Nm3/year (2005) – Total investment : 14 million EUR – 64 biogas buses – 12 public biogas filling stations (2005) BACKGROUND Linköping is a city on the east coast of Sweden with 140‚000 inhabitants. The city both has a university and a number of important industries e.g. SAAB Aero airplane assembly. The city is located in the middle of an
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Project Practicum Part 1 Dated: January 28‚ 2013 By: Shailendra Avva Overview: This paper talks about recent catastrophic events and brutal shooting incidents that have taken place in schools that are related to the safety of children‚ faculty and other visitors. Further this paper discusses technological solution that could be applied to avoid such events and provide more safety to the people at school. Introduction: School shootings‚ especially in United States of America‚ are being witnessed
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Mungiu. The discerning voice of a true auteur 1.Introduction “Only great minds can afford a simple style.” (Stendhal). “Style is knowing who you are‚ what you want to say‚ and not giving a damn”. (Orson Welles). “Style is an easy way of saying complicated things”. (Jean Cocteau). The greatest artists have all expressed their opinion about style as distinctiveness and individuality in art and have regarded the personality of the artist as the main criterion of value. According to their definitions
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traits are visible in Clare Savage. However‚ Cliff clarifies this in a her journal article she wrote called‚ “Caliban’s Daughter.” Cliff says‚ “The protagonist of my two novels is named Clare Savage. She is not an autobiographical character‚ but an amalgam of myself and others.” Michelle Cliff writes about how “we‚ the colonized‚ are also subject to ruination.” The reference to “Caliban” is rooted from an earlier time when Caribbean intellectuals struggled with issues of identity due to the process
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appeal to the modern reader. I would consider Bishops concern with everyday objects to be one of the most appealing attributes of her poetry. Bishop takes objects that everybody can relate to and understand‚ and through poems like ‘The Fish’ and ‘The Filling Station’ she gives these objects a wonderful and powerful significance. This technique allows the reader to see the world in a new light. Another reason that Bishop appeals to the modern reader is her characterisation of childhood‚ especially the
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mitigate their effects with least possible level of costs and resources. The following flowchart shows the overall process adopted by the company: (Exhibit 1) Filling a rush order: Process Resource(s) Process Time Cumulative Time Consumed Taking Order E-mail 0 minutes 0 minutes Washing and Mixing Self 6 minutes 6 minutes Filling Tray Self 2 minutes 8 minutes Preparing Oven Roommate 1 minute 9 minutes Baking Oven 9 minutes 18 minutes Removing the tray Roommate 0 minutes 18 minutes Cooling
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A CASE STUDY ON THE EVOLUTION OF MOSQUITO REPELLENTS By:- Rajdeep Laha Calcutta Business School PGDM 2010-12 OVERVIEW Traditionally‚ various types of substances have been used to repel mosquitos. These include such things as smoke‚ plant extracts‚ oils‚ tars‚ and muds. As insect repellent technology became more sophisticated‚ individual compounds were discovered and isolated. This allowed the formulation of new‚ more efficient forms of mosquito repellents. The first truly effective
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