Metodología de terreno para apoyar la evaluación del contenido de salmueras de litio y potasio en cuencas salinas

Recientes avances en la tecnología de baterías ha provocado un incremento en la demanda y en el interés por depósitos de salmueras ricos en litio en Argentina. Junto con el contenido de litio, el potasio es un importante sub-producto comercializable para la industria de la agricultura. Con el apoyo de Galaxy Lithium, Montgomery & Associates ha desarrollado una metodología sistemática para determinar las propiedades físico-químicas del acuífero necesarias para evaluar los depósitos de salmueras. Estos métodos incluyen diversos análisis de laboratorio de muestras de testigos, muestreos de salmueras a diferentes profundidades, perfiles de conductividad eléctrica, muestreos de bombeos de bajo caudal, y pruebas de bombeo de corta y larga duración. Los buenos resultados obtenidos del análisis de los diversos métodos utilizados en las labores de campo, han permitido obtener un grado de confiabilidad más que satisfactorio en el desarrollo del modelo conceptual y en el plan de mina y extracción.Recent advances in battery technology has brought upon an increased demand and interest in li thium-rich brine deposits in Argentina. In addition to lithium contained in these deposits, potassium is an important and saleable by-product for the agricultural industry. With the support of Galaxy Lithium, Montgomery & Associates has developed a systematic approach for understanding the aquifer and chemical properties required to evaluate brine deposits. These methods include several different laboratory analyses for core samples, depth-specific brine sampling, downhole electrical conductivity measurements, low flow sampling, and short- and long-term aquifer tests. Good agreement of results from the various methods used in the field has resulted in a large degree of confidence in the conceptual model and future mining and extraction plan.Universidad Nacional de La Plat

TLC Year in Review

With contributions by Matthew Schehl, Shona Dunn, Ali Rodgers, Betsy Wallace, Miriam Bergue Alves, Michael Guerrero, Aileen B. Houston, Cheryldee Huddleston, Leo Blanken and Cecilia Panella, and a forward by Scott Bischoff, Dennis Lester, and Tom Rosko

A comparison study of the petrology of fine-grained clastics in mid-Cenozoic age basin deposits, Pima and Cochise Counties, Arizona

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Efficiency and profitability in US not-for-profit hospitals

This article examines the relationship between hospital profitability and efficiency. A cross-section of 1317 U.S. metropolitan, acute care, not-for-profit hospitals for the year 2015 was employed. We use a frontier method, stochastic frontier analysis, to estimate hospital efficiency. Total margin and operating margin were used as profit variables in OLS regressions that were corrected for heteroskedacity. In addition to estimated efficiency, control variables for internal and external correlates of profitability were included in the regression models. We found that more efficient hospitals were also more profitable. The results show a positive relationship between profitability and size, concentration of output, occupancy rate and membership in a multi-hospital system. An inverse relationship was found between profits and academic medical centers, average length of stay, location in a Medicaid expansion state, Medicaid and Medicare share of admissions, and unemployment rate. The results of a Hausman test indicates that efficiency is exogenous in the profit equations. The findings suggest that not-for-profit hospitals will be responsive to incentives for increasing efficiency and use market power to increase surplus to pursue their objectives.</p

A qualitative assessment of the medicare prospective payment system

This paper employs commonly accepted criteria to evaluate the potential outcomes of the Medicare pricing mechanism. The analysis suggests that the recent revisions in the Medicare payment system have less potential to contain increases in total hospital costs than those embodied in all-payer systems. In addition, this paper also suggests that the pricing mechanism will jeopardize the financial viability of many hospitals while exacerbating inequities that emanate from differential pricing policies. Finally, when viewed from the perspective of insured beneficiaries, it is reasonable to expect that the payment mechanism will reduce not only access to inpatient care but also the use of service once admitted.

Response to modeling and notation of DEA with strong and weak disposable outputs

DEA, Congestion, Weak and strong output disposability, Hospital efficiency,

Predictors of hospital profitability:a panel study including the early years of the ACA

Purpose: To assess the internal and external environmental factors that affect variations in hospital profitability. We are especially interested in examining the impact of the ACA regulations.Methods: We used an unbalanced panel of 1,908 metropolitan U.S. hospitals in the 48 contiguous states during the period 2000-2015, resulting in 28,888 observations. The primary sources of data were Medicare Hospital Cost Reports and the American Hospital Association Annual Survey of Hospitals. Fixed-effect regression with correction for serial correlation, using total margin and operating margin as dependent variables, was employed.Results: Hospital profitability was positively associated (at p &lt; 0.05) with for-profit ownership, market power, hospital size, availability of high technology services and occupancy rate. Profitability was negatively associated with average length of stay and county unemployment rate.  There was no discernible temporal trend. However, total margin spiked downward in 2008 during the Great Recession but recovered afterwards.  The implementation of the Affordable Care Act was associated with an improved operating margin in states that expanded their Medicaid programs but not in other states.Conclusions: Competitive advantages such as size, market power and availability of high-technology services are associated with higher hospital profitability. External market events such as the Great Recession can decrease hospital profits. For-profit hospitals tend to be more profitable than not-for-profit hospitals. The implementation of the ACA had only a one-time positive impact on operating margin.</p

A robust analysis of hospital efficiency and factors affecting variability

International audienc