323 research outputs found
Weaving social Networks
Elfring, T. [Promotor]Bunt, G.G. [Copromotor]van de Tilburg, A. van [Copromotor
A Novel Precision Die Attach Technique for Opto-Electronics Packaging
ABSTRACT Semiconductor Laser diodes that emit visible light have various interesting applications such as sensing, high density optical storage and projection displays. In any opto-electronic package, the laser diode chips are typically attached or soldered to metal or ceramic substrates that have good thermal conductivity and are well-matched in coefficient of thermal expansion using solder. Some applemented on several samples and the feasibility of achieving the alignment precision to within a micron was demonstrated
Non-equilibrium interface equations: An application to thermo-capillary motion in binary systems
Interface equations are derived for both binary diffusive and binary fluid
systems subjected to non-equilibrium conditions, starting from the
coarse-grained (mesoscopic) models. The equations are used to describe
thermo-capillary motion of a droplet in both purely diffusive and fluid cases,
and the results are compared with numerical simulations. A mesoscopic chemical
potential shift, owing to the temperature gradient, and associated mesoscopic
corrections involved in droplet motion are elucidated.Comment: 12 pages; Latex, revtex, ap
Sorghum and Millet Economies in Asia – Facts, Trends and Outlook
Sorghum and millets are important cereals that
play a significant role in the food and nutrition
security of developing countries. Together,
they account for 10% of Asia’s coarse grain
production. India is the largest producer of
sorghum and millets, accounting for over 80%
of Asia’s production. However, the yield levels
in India are relatively low despite the adoption
of improved cultivars and hybrids
Non-Gaussian Distributions in Extended Dynamical Systems
We propose a novel mechanism for the origin of non-Gaussian tails in the
probability distribution functions (PDFs) of local variables in nonlinear,
diffusive, dynamical systems including passive scalars advected by chaotic
velocity fields. Intermittent fluctuations on appropriate time scales in the
amplitude of the (chaotic) noise can lead to exponential tails. We provide
numerical evidence for such behavior in deterministic, discrete-time passive
scalar models. Different possibilities for PDFs are also outlined.Comment: 12 pages and 6 figs obtainable from the authors, LaTex file,
OSU-preprint-
An analysis of availability and utilization of sorghum grain in India
Sorghum (Sorghum bicolor) is one of the major cereal
crops consumed in India after rice (Oryza sativa) and
wheat (Triticum aestivum). The crop is primarily
produced in Maharashtra and southern states of
Karnataka and Andhra Pradesh. These three states
together account for close to 80% of the all-India
production. Madhya Pradesh, Gujarat and Rajasthan are
the other states producing sorghum. India is the third
largest producer of sorghum in the world with 7.15
million tons during 2007 and almost entire production of
sorghum (95%) in the country comes from the above
regions/states (GOI 2007)
Availability and utilization of pearl millet in India
Pearl millet (Pennisetum glaucum) is the most widely
grown type of millet. Because of its tolerance to difficult
growing conditions such as drought, low soil fertility and
high temperature, it can be grown in areas where other
cereal crops, such as maize (Zea mays) or wheat
(Triticum aestivum), would not survive. Pearl millet
production is concentrated in the developing countries
which account for over 95% of the production and acreage.
India continues to be the single largest producer of pearl
millet in the world, although the area has been declining
in the traditional growing states of Gujarat, Rajasthan and
Haryana. Pearl millet is usually grown as a dryland dualpurpose grain and fodder crop although it is sometimes
irrigated in India, particularly the summer crop grown
mainly as a forage crop
Chickpea and Pigeonpea Economies in Asia: Facts, Trends and Outlook
This report provides a factual assessment of consumption, production and marketing of pulses in
Asia, and explores future prospects for the pulses sector by focusing on chickpea and pigeonpea,
the two most important pulse crops grown in the continent. Chickpea and pigeonpea are important
grain legumes and play a significant role in the food and nutrition security of the poor in developing
countries of Asia. Together, these crops account for 41% of Asia’s pulses production. Asia accounts
for 88% of global chickpea production and 90% of global pigeonpea production. Within Asia, India
is the largest producer of both crops, accounting for 75% of Asia’s chickpea as well as pigeonpea
production
Global trends in production and trade of major grain legumes
Production trends in grain legumes — pulses, groundnuts and soybean — have followed an increasing
trend with the global production doubling from 148 million tons in 1980-82 to 3 10 million tons in 2004-06.
The increase was led by increases in soybean production which increased from 87 million tons to 214 million
tons due to an increase in the demand for protein meals and oils from the EU and the US feed sectors and
the appearance of new producers like India, China, Argentina and Brazil. Consequently, the share of developing
countries in global grain legume production has increased from 55% in 1980-82 to 65% in 2004-06. Growth
in the global production of pulses has been the slowest among the grain legumes, growing at 1.05% per
annum between 980 to 2006. The emergence of countries such as Canada and Australia, the area expansion
under pulses in Africa, and the export oriented production of the South East Asian countries have contributed
to the increase in the global pulse production. The largest pulse producers are still the developing countries
and their share of the global pulse production is largely unchanged at around 70%. However, yield levels and
yield growth rates are considerably higher in the developed countries. Grain legumes are traded in different
forms such as kernels/seeds, cakes and meals, and oils. Trade in seeds/kernels of grain legumes has increased
with nearly 20% of production quantities being traded in 2000-05. However, this figure masks the contrary
trends in the trade patterns of individual legumes and between regions. Among the legumes, exports in
soybean have increased with 31% of soybean being traded, owing to increased demand from the feed sector,
with Argentina, Brazil and Paraguay emerging as major exporters. In this paper, an analysis has been made
on the global and regional production, yield trends, global trade and price trends of grain legume
Dynamics of An Underdamped Josephson Junction Ladder
We show analytically that the dynamical equations for an underdamped ladder
of coupled small Josephson junctions can be approximately reduced to the
discrete sine-Gordon equation. As numerical confirmation, we solve the coupled
Josephson equations for such a ladder in a magnetic field. We obtain
discrete-sine-Gordon-like IV characteristics, including a flux flow and a
``whirling'' regime at low and high currents, and voltage steps which represent
a lock-in between the vortex motion and linear ``phasons'', and which are
quantitatively predicted by a simple formula. At sufficiently high anisotropy,
the fluxons on the steps propagate ballistically.Comment: 11pages, latex, no figure
- …