On the equivalence of LIST and DIIS methods for convergence acceleration

Self-consistent field extrapolation methods play a pivotal role in quantum chemistry and electronic structure theory. We here demonstrate the mathematical equivalence between the recently proposed family of LIST methods [J. Chem. Phys. 134, 241103 (2011); J. Chem. Theory Comput. 7, 3045 (2011)] with Pulay's DIIS [Chem. Phys. Lett. 73, 393 (1980)]. Our results also explain the differences in performance among the various LIST methods

Contesting market-based conservation: Payments for ecosystem services as a surface of engagement for rural social movements in Mexico

The Mexican National Payment for Ecosystem Services (PES) programs, which provide financial incentives for rural landholders to conserve forest, were originally designed under the logic of market-based conservation. Based on a multi-sited, multi scalar ethnography of the Mexican national PES programs, this article examines the process through which a national rural social movement was able to redefine the market-based narrative of PES, the historical and political context that provided this window of opportunity, and the ways in which their engagement led to a hybridization of the policy itself. The involvement of the rural social movement introduced a very different conception of PES – as a recognition by Mexico’s federal state and urban society of the value of campesino environmental stewardship and an economic support to allow them to remain on the land. Their direct involvement in the redesign of the programs had a significant impact on their conformation that reflected this vision of revaluing the rural: the inclusion of agroforests and sustainably managed timber lands; requirements for self-defined forest management plans; provision of dedicated funding for technical assistance; and the training of local extensionists. I believe that in mapping the evolution of the Mexican national PES program we can begin to see how, in this particular place and time, rural social movements employed PES as a "useful surface of engagement" (Escobar 1999, p. 13) for contesting the market-based notions of the federal state, international lending institutions and conservation NGOs. I position this analysis in the context of the global project of “grabbing green” and as an example of the frictions that can inhibit and even partially reverse the logic of the seemingly inexorable rise of market-based conservation policy and projects

Multichannel Distribution Strategies in Latin America

The process of designing and selecting distribution channels is challenging and it demands an in-depth understanding of the market. Leading firms competing in Latin America are exploring creative ways to effectively reach and efficiently serve each segment of the market. This paper characterizes the key drivers that shape the design and selection of sales and distribution channels. Based on a series of workshops and in-depth analyses from 14 enterprises and 35 distinct distribution schemes we identify key factors and propose a framework that characterize drivers currently used by Latin American companies to design distribution channel strategies

Actinide chemistry using singlet-paired coupled cluster and its combinations with density functionals

Singlet-paired coupled cluster doubles (CCD0) is a simplification of CCD that relinquishes a fraction of dynamic correlation in order to be able to describe static correlation. Combinations of CCD0 with density functionals that recover specifically the dynamic correlation missing in the former have also been developed recently. Here, we assess the accuracy of CCD0 and CCD0+DFT (and variants of these using Brueckner orbitals) as compared to well-established quantum chemical methods for describing ground-state properties of singlet actinide molecules. The $f^0$ actinyl series (UO$_2^{2+}$, NpO$_2^{2+}$, PuO$_2^{2+}$), the isoelectronic NUN, and Thorium (ThO, ThO$^{2+}$) and Nobelium (NoO, NoO$_2$) oxides are studied.Comment: 8 page

Banking Sector Performance in Latin America: Market Power versus Efficiency

TSince the mid-1990s the banking sector in the Latin American emerging markets has experienced profound changes due to financial liberalisation, a significant increase in foreign investments and greater mergers activities often occurring following financial crises. The wave of consolidation and the rapid increase in market concentration that took place in most countries has generated concerns about the rise in banks’ market power and its potential effects on consumers. This paper advances the existing literature by testing the market power (Structure-Conduct-Performance and Relative Market Power) and efficient structure (X- and scale efficiency) hypotheses for a sample of over 2,500 bank observations in nine Latin American countries over 1997-2005. We use the Data Envelopment Analysis technique to obtain reliable efficiency measures. We produce evidence supporting the efficient structure hypotheses. The findings are particularly robust for the largest banking markets in the region, namely Brazil, Argentina and Chile. Finally, capital ratios and bank size seem to be among the most important factors in explaining higher than normal profits for Latin American banks.Structure-Conduct-Performance; Efficient Structure; Latin American banking; Data Envelopment Analysis (DEA).

Comparison of self-consistent field convergence acceleration techniques

The recently proposed ADIIS and LIST methods for accelerating self-consistent field (SCF) convergence are compared to the previously proposed energy-DIIS (EDIIS) + DIIS technique. We here show mathematically that the ADIIS functional is identical to EDIIS for Hartree-Fock wavefunctions. Convergence failures of EDIIS + DIIS reported in the literature are not reproduced with our codes. We also show that when correctly implemented, the EDIIS + DIIS method is generally better than the LIST methods, at least for the cases previously examined in the literature. We conclude that, among the family of DIIS methods, EDIIS + DIIS remains the method of choice for SCF convergence acceleration

Banking Sector Performance in Some Latin American Countries: Market Power versus Efficiency

The wave of consolidation and the rapid increase in market concentration that took place in most Latin American countries has generated concerns about the rise in banks' market power and its potential effects on consumers. This paper advances the existing literature by testing the market power (Structure-Conduct-Performance and Relative Market Power) and efficient structure (X- and scale efficiency) hypotheses for a sample of over 2,500 bank observations in nine Latin American countries over 1997-2005. We use the Data Envelopment Analysis technique to obtain reliable efficiency measures. We produce evidence supporting the efficient structure hypotheses. Finally, capital ratios and bank size seem to be among the most important factors in explaining profits for these Latin American banks.Structure-Conduct-Performance, Efficient Structure, Banking System in Some Latin American Countries, Data Envelopment Analysis (DEA)