A statistical approach to the inverse problem in magnetoencephalography

Magnetoencephalography (MEG) is an imaging technique used to measure the magnetic field outside the human head produced by the electrical activity inside the brain. The MEG inverse problem, identifying the location of the electrical sources from the magnetic signal measurements, is ill-posed, that is, there are an infinite number of mathematically correct solutions. Common source localization methods assume the source does not vary with time and do not provide estimates of the variability of the fitted model. Here, we reformulate the MEG inverse problem by considering time-varying locations for the sources and their electrical moments and we model their time evolution using a state space model. Based on our predictive model, we investigate the inverse problem by finding the posterior source distribution given the multiple channels of observations at each time rather than fitting fixed source parameters. Our new model is more realistic than common models and allows us to estimate the variation of the strength, orientation and position. We propose two new Monte Carlo methods based on sequential importance sampling. Unlike the usual MCMC sampling scheme, our new methods work in this situation without needing to tune a high-dimensional transition kernel which has a very high cost. The dimensionality of the unknown parameters is extremely large and the size of the data is even larger. We use Parallel Virtual Machine (PVM) to speed up the computation.Comment: Published in at http://dx.doi.org/10.1214/14-AOAS716 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org

The experimental induction of response set

Call number: LD2668 .T4 1957 E32Master of Scienc

Pemberian Mulsa terhadap Tujuh Varietas Kacang Hijau dan Keharaan Tanah di Lahan Lebak Tengahan

The objectives of this research were to obtain several mungbean varieties which suitable under fresh water swamp land conditions and to study the effect of mulch application on mungbean and soil nutrient in fresh water swamp land area. The research was conducted on water swamp land of Tawar village, Hulu Sungai Selatan in dry season of 2004. The results showed that the yield and the yield components of mungbean were not affected by mulch application. On the other hand, there were yield differences among mungbean varieties. Mulch application significantly decreased soil-pH, soil organic-C, total-P, available-P and K uptake but increased soil total-N and P uptake

Keragaan Hasil dan Daya Toleransi Genotipe Kedelai di Lahan Sulfat Masam

High soil acidity is one of the problems caused low soybean productivity on acid sulphate soil. Using tolerant variety is one effort for increasing soybean productivity on acid sulphates oil. The objective of these researches were to understand the performance yield and tolerancy of soybean genotypes to acid sulphate soil. These researches were conducted on acid sulphate soil at Pindahan Baru. Jajangkit Timur and Talaran-Barito Kuala District of South Kalimantan in wet season of 2003/04. These researches were arranged in Randomized Completely Design with three replications. Five genotypes and 4 varieties were evaluated for their tolerance and yield potential. The result showed that none of the genotypes have yield higher than that of check varieties Lawit, Menyapa and Sibayak. There was one of genotypes i.e. Msc 9234-D-3 give higher yield than check varieties Tanggamus, good seed quality and tolerant to acid sulphate soil

Pengaruh Bahan Amelioran terhadap Pertumbuhan dan Hasil Tiga Varietas Buncis di Atas Sistem Surjan pada Lahan Sulfat Masam Potential

High soil acidity is one of the problems causing low snap bean yield on potential acid sulphate soils. Using tolerant variety and applying ameliorant were several efforts to increase snap bean yield on potential acid sulphate soils. The objective of this research was to evaluate the effect of ameliorant application on plant growth, and yield of three snap bean varieties on potential acid sulphate soils. This research was conducted on potential acid sulphate soil on surjan system at Experimental Station Belandean in Barito Kuala regency of South Kalimantan province in the dry season of 2005. The experiment was arranged in split-plot design with three replications. The main plots were ameliorant application, i.e. control, liming 1 t.ha-1 + manure 2.5 t.ha-1 , and liming 2 t.ha-1 + manure 5 t.ha-1, and the sub plots were three snap bean varieties, i.e. Lebat, Perkasa and Bravo. The result showed that the plant growth and yield of snap bean were affected by ameliorant application. Liming with dosages of 1.0 t.ha + manure 2.5 t.ha-1 increased yield 2 581 kg.ha-1 or 81.5 % higher than control. All varieties showed the same yield on acid sulphate soil

The relation of dry skim milk to several of the physical and chemical properties of whipped cream

Publication authorized May 21, 1934."The data presented in this bulletin were taken from a paper submitted by the junior author in partial fulfillment of the requirements for the degree of Master of Arts in the Graduate School of the University of Missouri, 1933"--P. [3].Includes bibliographical references (page 36)

Pengujian Galur Kedelai di Lahan Pasang Surut

Testing of soybean genotypes were conducted at six locations of tidal swampland; in dry season of 1999/2000. Eight genotypes and two checks varieties i.e. Wilis and Slamet were evaluated for their yield potential. The experiment was using Randomized Completely Block Design with four replications. The result showed that yield of two genotypes, MSC 9/12-D-4 and MSC 9243-D-3, were higher and relatively stable compared to Wilis and Slamet. Key words Soybean, Tidal swamplan