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En el presente trabajo de investigación me propuse conocer algunos aspectos de los hábitos de consumo de cocaína de una “población oculta” de la clase media/alta que por sus características no afecta públicamente la salud y la vida social de estos usuarios de drogas que viven en la ciudad de Posadas, Misiones. A través de un largo proceso de inserción al en los lugares de uso de substancias prohibidas de este tipo de usuarios, he utilizado la técnicas del trabajo de campo antropológico, observando las formas de consumo de cocaína en las clases sociales media/alta de la ciudad de Posadas.

s book is a detailed real account of all the key phases of the land tenure reform (LTR) programme in Rwanda and the critical factors that defined the outcomes and requirements for sustaining the process. In addition, the book provides an account of the impact of the programme, its challenges and lessons learned. Beyond LTR, this book also provides insights into emerging issues post-land tenure reform and what efforts are being undertaken to ensure sustainable land administration and land governance. The book draws on various types of secondary data, including relevant laws, policies, operational manuals and published studies, as well as consultants' reports. It also uses primary data comprising mainly interviews with policy makers, land professionals, academics, Civil Society Organisations (CSOs), donor organizations and the general public. This book is in four parts, with nine chapters. Part 1 provides the relevant context of the book and contains two chapters (chapters 1 and 2). Chapter 1 is the introduction and explains why land is so important; it discusses some of the issues land resources currently face, especially, in developing countries and why it should be managed and governed properly; it outlines why there is an urgent need for an improved land governance and land administration system or land tenure reform where this is not taking place, and it provides a summary of the importance of documenting Rwanda's LTR programme and explains why this book is timely and different from existing literature on land tenure reform. In chapter 2, the historical context of land tenure systems in Africa is summarized. Part 2 deals with the preparatory work that was carried out for land tenure reform and has one chapter (chapter 3). The chapter describes the key exercises that were undertaken as part of preparing the ground for the land tenure reform programme. Part 3 concentrates on implementation of the LTR programme and contains four chapters (chapters 4 to 7). Chapter 4 focuses on how the policy and regulatory frameworks were established which supported the LTR programme. Chapter 5 details the institutional framework that was developed to guide the LTR programme implementation, defining each institution's mandate and how they interacted with each other as well as how the capacity of these institutions was built to apportion responsibilities accordingly. Chapter 6 explains the whole process of rolling out the land tenure regularization process countrywide and the key steps that were involved, as well as the implementation process. In chapter 7, the key ingredients required to ensure that what has been achieved by the LTR would be properly maintained are assessed. The last part of the book (Part 4) assesses the impact of the LTR programme by discussing the socioeconomic benefits in chapter 8 where testimonies from various stakeholders and LTR beneficiaries are also presented. Chapter 9 concludes the book and a set of key success factors and lessons are also outlined for other countries wishing to follow a similar route as Rwanda in terms of land tenure reform.

Rydberg physics is the land of gentle giants--highly-excited electronic states where an electron is, on average, far from the nucleus. They are created with a lot of energy, have unusually large size and live relatively long. They are useful because they are extremely sensitive to their environment; so much so that a single photon of light can change the behaviour of not only one, but dozens or hundreds of them, over distances we can easily see under an optical microscope. Wherever Rydberg states are created--in atoms, molecules or solids--they all share common features that are exemplified by the physical description of highly-excited hydrogen atoms, with energy levels described by the Rydberg formula.