The Efficiency of Labor Input in the Tree Nut Growers Industry: A Stochastic Frontier Production Approach Study in Butte County, California

The U.S. government recruits immigrant workers through the H-2A program as a short-term solution to the agricultural sectors’ labor shortage problem. Although the sector insists hiring immigrant workers is essential for their survival, history has proven the socio-economic cost for doing so is enormous. This paper aims to investigate the contribution of labor to agricultural production efficiency. A discussion of marginal rate of technical substitution, economies of scale, and economies of scope will also be included. The stochastic production frontier regression approach was applied to input/output data collected from a survey of tree nut growers in Butte County, California. Results indicate the labor input is not significant in deciding farm production efficiency. Instead of attempting to increase short-term labor, producers’ and policy makers’ efforts should be directed toward improving the logistics of farm management and the quality of labor, thus more efficiently utilizing available resources.Stochastic Frontier Production Model, Labor Input Efficiency, Labor Economics, Labor and Human Capital, Production Economics, Productivity Analysis, Q120, J240, D240,

Information acquisition and financial contagion.

This paper incorporates costly voluntary acquisition of information à la Nikitin and Smith (2007) [Nikitin, M., Smith, R.T., 2007. Information acquisition, coordination, and fundamentals in a financial crisis. Journal of Banking and Finance, in press, doi:10.1016/j.jbankfin.2007.04.031], in a framework similar to Allen and Gale (2000) [Allen, F., Gale, D., 2000. Financial contagion. Journal of Political Economy 108, 1–33], without relying on any unexpected shock to model contagion. In this framework, contagion and financial crises are the result of information gathering by depositors, weak fundamentals and an incomplete market structure of banks. It also shows how financial systems entering a recession can affect others with apparently stronger economic conditions (contagion). Finally, this is the first paper to investigate the effectiveness of the Contingent Credit Line procedures, introduced by the IMF at the end of the nineties, as a mechanism to prevent the propagation of crises.Central Bank; Contingent credit line; Financial contagion; Fundamentals; Verification equilibrium;

Reflecting on forty years of sociology, media studies, and journalism : An Interview with Todd Gitlin and Michael Schudson

Reflecting on more than four decades in dual scholarly careers that cut across the boundaries between communication, the sociology of culture, and journalism studies, Professor Todd Gitlin and Professor Michael Schudson discuss the growth, evolution, and strengths and weaknesses of the media studies field with Professor Jiang Chang. The three reflect on the origins of the research, the gap between the field of journalism studies and the field of sociology, the role played by journalism in the growing conflict between China and the United States, the relationship between media and political protest, and whether there ought be any cause for optimism regarding the state of democracy in the twenty-first century.Peer reviewe

Magnetar Spindown, Hyper-Energetic Supernovae, and Gamma Ray Bursts

The Kelvin-Helmholtz cooling epoch, lasting tens of seconds after the birth of a neutron star in a successful core-collapse supernova, is accompanied by a neutrino-driven wind. For magnetar-strength ($\sim10^{15}$ G) large scale surface magnetic fields, this outflow is magnetically-dominated during the entire cooling epoch.Because the strong magnetic field forces the wind to co-rotate with the protoneutron star,this outflow can significantly effect the neutron star's early angular momentum evolution, as in analogous models of stellar winds (e.g. Weber & Davis 1967). If the rotational energy is large in comparison with the supernova energy and the spindown timescale is short with respect to the time required for the supernova shockwave to traverse the stellar progenitor, the energy extracted may modify the supernova shock dynamics significantly. This effect is capable of producing hyper-energetic supernovae and, in some cases, provides conditions favorable for gamma ray bursts. We estimate spindown timescales for magnetized, rotating protoneutron stars and construct steady-state models of neutrino-magnetocentrifugally driven winds. We find that if magnetars are born rapidly rotating, with initial spin periods ($P$) of $\sim1$ millisecond, that of order $10^{51}-10^{52}$ erg of rotational energy can be extracted in $\sim10$ seconds. If magnetars are born slowly rotating ($P\gtrsim10$ ms) they can spin down to periods of $\sim1$ second on the Kelvin-Helmholtz timescale.Comment: 16 pages, 5 figures, emulateap

Mutations in glioblastoma oncosuppressive pathways pave the way for oncomodulatory activity of cytomegalovirus

Over the last decade, cytomegalovirus (CMV) has been suggested to promote the development of glioblastoma multiforme (GBM). Recent evidence demonstrates that CMV contributes to the progression of GBM in the context of oncosuppressor gene mutations. This finding provides further insights into the mechanisms whereby CMV exacerbates the malignancy of GBM

PAALF People\u27s Plan: East Portland Pilot

Recognizing the traumatic experience of being forced to move and losing community, this plan reflects the hopes of community members who seek to rebuild their lives in a new place. The East Portland Pilot Plan applies the urban planning practice of placemaking as a transformative intervention for addressing challenges and stabilizing the Black community in East Portland. This plan also emerges at a critical time, as existing city plans for East Portland indicate significant future public investment and development. This plan has been written with a wide audience in mind. The material is relevant to homeowners, community activists, urban planners, nonprofit advocates and policymakers among others. The East Portland Pilot Plan is on the one hand a portrait of the Black community in East Portland; a portrait that has been narrated largely by the people themselves, and recorded in this document. On the other hand, the EPPP is a guide to action, a toolkit to address some of the most persistent issues facing Africans and African Americans and a roadmap to a thriving and vibrant Black community in East Portland. This project was conducted under the supervision of Sy Adler, Susan Hartnett and Marisa Zapata

Functional Droplets that Recognize, Collect, and Transport Debris on Surfaces

We describe polymer-stabilized droplets capable of recognizing and picking up nanoparticles from substrates in experiments designed for transporting hydroxyapatite nanoparticles that represent the principal elemental composition of bone. Our experiments, which are inspired by cells that carry out materials transport in vivo, used oil-in-water droplets that traverse a nanoparticle-coated substrate driven by an imposed fluid flow. Nanoparticle capture is realized by interaction of the particles with chemical functionality embedded within the polymeric stabilizing layer on the droplets. Nanoparticle uptake efficiency is controlled by solution conditions and the extent of functionality available for contact with the nanoparticles. Moreover, in an elementary demonstration of nanoparticle transportation, particles retrieved initially from the substrate were later deposited “downstream,” illustrating a pickup and drop-off technique that represents a first step toward mimicking point-to-point transportation events conducted in living systems