Physics with antihydrogen

Performing measurements of the properties of antihydrogen, the bound state of an antiproton and a positron, and comparing the results with those for ordinary hydrogen, has long been seen as a route to test some of the fundamental principles of physics. There has been much experimental progress in this direction in recent years, and antihydrogen is now routinely created and trapped and a range of exciting measurements probing the foundations of modern physics are planned or underway. In this contribution we review the techniques developed to facilitate the capture and manipulation of positrons and antiprotons, along with procedures to bring them together to create antihydrogen. Once formed, the antihydrogen has been detected by its destruction via annihilation or field ionization, and aspects of the methodologies involved are summarized. Magnetic minimum neutral atom traps have been employed to allow some of the antihydrogen created to be held for considerable periods. We describe such devices, and their implementation, along with the cusp magnetic trap used to produce the first evidence for a low-energy beam of antihydrogen. The experiments performed to date on antihydrogen are discussed, including the first observation of a resonant quantum transition and the analyses that have yielded a limit on the electrical neutrality of the anti-atom and placed crude bounds on its gravitational behaviour. Our review concludes with an outlook, including the new ELENA extension to the antiproton decelerator facility at CERN, together with summaries of how we envisage the major threads of antihydrogen physics will progress in the coming years

A Study On The Model Of Profit And Risk In Xiamen’s Commercial Banks

随着相对滞后的金融体制改革提上议事日程，金融业中的银行业的风险和效益的矛盾对立统一日益成为讨论的焦点、热点。加入WTO对金融业意味着拥有先进管理技术和经验的外资银行抢滩国内银行业务，其对国内中资银行的竞争和生存环境的影响是巨大且不可预测的。作者认为国内中资银行是缺乏效率的，为避免银行命脉被外资控制，国内中资银行不能讳疾忌医，而要以有容乃大、自省的态度积极寻求市场经济下的解决之道，最可取的莫过于解剖一只麻雀。 按照这一思路，本文选取了厦门8家经营较稳定的商业银行进行收益风险模式比较，为国内其他中资商业银行的经营管理提供实证参考。 第一章导言。对银行经营活动的一般特点进行描述。提出银行作为经济...Owing to the combination between banking and economics , influencing factor is increasingly complicated. Banker needs to design one macroanalysis model to logically judge different kinds of income chance and danger all banks faced with，through which banker may supply effective diagnose for banking operating management. The theses takes banking 'data in Xiamen as an example .It exists that huge c...学位：工商管理硕士院系专业：管理学院工商管理教育中心_工商管理硕士(MBA)学号：19981505