The Determinants of Technology Adoption by UK Farmers using Bayesian Model Averaging. The Cases of Organic Production and Computer Usage.

We introduce and implement a reversible jump approach to Bayesian Model Averaging for the Probit model with uncertain regressors. This approach provides a direct estimate of the probability that a variable should be included in the model. Two applications are investigated. The �rst is the adoption of organic systems in UK farming, and the second is the in�uence of farm and farmer characteristics on the use of a computer on the farm. While there is a correspondence between the conclusions we would obtain with and without model averaging results, we �find important di¤erences, particularly in smaller samples.Agriculture, Adoption, Model Averaging, Organic, Computer

Integrating spatial dependence into stochastic frontier analysis

An approach to incorporate spatial dependence into Stochastic Frontier analysis is developed and applied to a sample of 215 dairy farms in England and Wales. A number of alternative specifications for the spatial weight matrix are used to analyse the effect of these on the estimation of spatial dependence. Estimation is conducted using a Bayesian approach and results indicate that spatial dependence is present when explaining technical inefficiency.Spatial dependence, technical efficiency, Bayesian, spatial weight matrix

KOLABORASI MODEL PENTA HELIX DALAM MEWUJUDKAN SMART VILLAGE PONDOK RANJI

Smart Village Kelurahan Pondok Ranji Kecamatan Ciputat Timur, Kota Tangerang Selatan dalam pelaksanaannya mengalami banyak kendala dan belum berdampak secara komprehensif karena belum memadainya sarana prasarana pendukung dan kegiatan-kegiatan terstruktur. Kemudian, kegiatan-kegiatannya lebih banyak diselenggarakan oleh unsur masyarakat dibandingkan dengan pemerintah atau stakeholder lainnya. Penelitian ini bertujuan untuk menganalisis model kolaborasi penta helix pada Smart Village Kelurahan Pondok Ranji Kecamatan Ciputat Timur, Kota Tangerang Selatan dengan menggunakan dimensi lima aktor dalam kolaborasi model penta helix, yaitu akademisi, bisnis, komunitas atau masyarakat, pemerintah, dan media. Pendekatan penelitian ini menggunakan pendekatan deskriptif kualitatif. Sumber data dalam penelitian ini diperoleh dengan teknik observasi, wawancara dan analisis data sekunder dari kajian literatur dan instansi terkait. Temuan penelitian menunjukkan bahwa peran setiap aktor penta helix dalam mewujudkan smart village di Kelurahan Pondok Ranji perlu lebih dioptimalkan. Berdasarkan analisis yang dilakukan, aktor yang dominan dalam pelaksanaan Smart Village Kelurahan Pondok Ranji adalah aktor komunitas atau masyarakat, namun memiliki keterbatasan sumber daya sehingga diperlukan peran aktor lain secara spesifik dan sistematis. Upaya-upaya dalam mewujudkan smart village di Kelurahan Pondok Ranji tersebut akan optimal apabila menerapkan pemerintahan kolaboratif dengan model penta helix. Kata Kunci: Smart Village, Penta Helix, Collaborative GovernanceSmart Village Kelurahan Pondok Ranji Kecamatan Ciputat Timur, Kota Tangerang Selatan dalam pelaksanaannya mengalami banyak kendala dan belum berdampak secara komprehensif karena belum memadainya sarana prasarana pendukung dan kegiatan-kegiatan terstruktur. Kemudian, kegiatan-kegiatannya lebih banyak diselenggarakan oleh unsur masyarakat dibandingkan dengan pemerintah atau stakeholder lainnya. Penelitian ini bertujuan untuk menganalisis model kolaborasi penta helix pada Smart Village Kelurahan Pondok Ranji Kecamatan Ciputat Timur, Kota Tangerang Selatan dengan menggunakan dimensi lima aktor dalam kolaborasi model penta helix, yaitu akademisi, bisnis, komunitas atau masyarakat, pemerintah, dan media. Pendekatan penelitian ini menggunakan pendekatan deskriptif kualitatif. Sumber data dalam penelitian ini diperoleh dengan teknik observasi, wawancara dan analisis data sekunder dari kajian literatur dan instansi terkait. Temuan penelitian menunjukkan bahwa peran setiap aktor penta helix dalam mewujudkan smart village di Kelurahan Pondok Ranji perlu lebih dioptimalkan. Berdasarkan analisis yang dilakukan, aktor yang dominan dalam pelaksanaan Smart Village Kelurahan Pondok Ranji adalah aktor komunitas atau masyarakat, namun memiliki keterbatasan sumber daya sehingga diperlukan peran aktor lain secara spesifik dan sistematis. Upaya-upaya dalam mewujudkan smart village di Kelurahan Pondok Ranji tersebut akan optimal apabila menerapkan pemerintahan kolaboratif dengan model penta helix. Kata Kunci: Smart Village, Penta Helix, Collaborative Governanc

Kelvin Wave Cascade and Decay of Superfluid Turbulence

Kelvin waves (kelvons)--the distortion waves on vortex lines--play a key part in the relaxation of superfluid turbulence at low temperatures. We present a weak-turbulence theory of kelvons. We show that non-trivial kinetics arises only beyond the local-induction approximation and is governed by three-kelvon collisions; corresponding kinetic equation is derived. On the basis of the kinetic equation, we prove the existence of Kolmogorov cascade and find its spectrum. The qualitative analysis is corroborated by numeric study of the kinetic equation. The application of the results to the theory of superfluid turbulence is discussed.Comment: 4 pages, RevTe

Social Security, Social Welfare and the Aging Population

This study examines the effects of pay-as-you-go social security programs in aging economies when the middle-aged both educate their dependent children and subsidize the retirement of the old. Using an overlapping generations framework in which agents are three-period lived but timing of death in the third period is uncertain, we analyze the effects of social security tax schemes, under various demographic assumptions, on capital accumulation, education expenditures, social welfare, and economic growth. We find that in many cases social security crowds out education, and reduces economic growth and social welfare

Capillary-gravity wave resistance in ordinary and magnetic fluids

Wave resistance is the drag force associated to the emission of waves by a moving disturbance at a fluid free surface. In the case of capillary-gravity waves it undergoes a transition from zero to a finite value as the speed of the disturbance is increased. For the first time an experiment is designed in order to obtain the wave resistance as a function of speed. The effect of viscosity is explored, and a magnetic fluid is used to extend the available range of critical speeds. The threshold values are in good agreement with the proposed theory. Contrary to the theoretical model, however, the measured wave resistance reveals a non monotonic speed dependence after the threshold.Comment: 12 pages, 4 figures, 1 table, submitted to Physical Review Letter