Model charged cylindrical nanopore in a colloidal dispersion: charge reversal, overcharging and double overcharging

Using the hypernetted-chain/mean spherical approximation (HNC/MSA) integral equations we study the electrical double layer inside and outside a model charged cylindrical vesicle (nanopore) immersed into a primitive model macroions solution, so that the macroions are only present outside the nanopore, i.e., the vesicle wall is impermeable only to the external macroions. We calculate the ionic and local linear charge density profiles inside and outside the vesicle, and find that the correlation between the inside and outside ionic distributions causes the phenomena of overcharging (also referred to as surface charge amplification) and/or charge reversal. This is the first time overcharging is predicted in an electrical double layer of cylindrical geometry. We also report the new phenomenon of double overcharging. The present results can be of consequence for relevant systems in physical-chemistry, energy storage and biology, e.g., nanofilters, capacitors and cell membranes.Comment: 10 pages, 4 figure

New financing trends in Latin America : an overview of selected issues and policy challenges

This article summarizes a 2007 conference that explored the nature and implications of major transformations in Latin American financial markets, such as the shift from cross-border to domestic financing and the development of domestic bond markets.Finance ; Economic policy ; Latin America

Multilevel governance challenges in transitioning towards a national approach for REDD+:Evidence from 23 subnational REDD+ initiatives

Although REDD+ was conceived as a national approach to reducing emissions from deforestation and forest degradation, many of the early advances have been at the subnational level. It is critical to link these subnational efforts to emerging national REDD+ frameworks, including with respect to finance and benefit distribution, setting reference levels, measurement, reporting and verification (MRV), land policy and safeguards. We use evidence from interviews with proponents from 23 subnational REDD+ initiatives in six countries to characterize the multilevel governance challenges for REDD+. We analyse the differences in perceived challenges between subnational jurisdictional programs and project-based initiatives, and then analyse proponents’ perceptions of the relationship between government policies at multiple levels and these REDD+ initiatives. We find important multilevel governance challenges related to vertical coordination and information sharing and horizontal and inter-sectoral tensions, as well as concerns over accountability, equity and justice. Though the shift to a nested, jurisdictional or national REDD+ is sometimes approached as a technical design issue, this must be accompanied by an understanding of the interests and power relations among actors at different levels. We outline challenges and suggest priority areas for future research and policy, as countries move towards a national REDD+ system

New financing trends in Latin America: An overview of selected issues and policy challenges

During the past fifteen years, financial markets in Latin America have experienced a major transformation. This process and its effects on the nature of risks and policy challenges in Latin America were the focus of a May 2007 conference in Mexico City sponsored by the Representative Office for the Americas of the Bank for International Settlements and the Americas Center of the Federal Reserve Bank of Atlanta. This article summarizes the papers presented at the conference as well as the discussions among participants from central banks, finance ministries, multilateral institutions, academia, and the private sector. In the first conference session, participants examined the shift from crossborder financing toward domestic financing, which has allowed domestic capital markets to expand and become deeper, more diversified, and less dependent on bank financing. The development of domestic bond markets and the resulting policy challenges were the focus of two conference sessions. Issues discussed included the benefits for sovereigns of issuing in local currency, the pros and cons of doing so in domestic vis-à-vis international markets, the criteria for determining whether to issue domestically or cross-border, the status of private markets, the role of structured finance, and whether developing these markets remains a policy objective for de-dollarizing the region's economies. In the final sessions, participants debated the implications that new financial markets have for monetary policysuch as markets' effect on policy transmission and the authorities' role in developing these marketsand for financial stability