52,804 research outputs found
Thermal pump-compressor for space use Patent
Thermal pump-compressor for converting solar energ
Decrease in the high energy X-ray flux from Cen XR-2. Search for X-rays from the large and small Magellanic clouds
High energy X ray sky survey data on decreased intensity of Cen XR-2, and X ray energy flux from Magellanic clouds - Mildura, Australia, October 15 and 24, 196
Switching and Extension of a [c2]Daisy-Chain Dimer Polymer
We report the synthesis of a [c2]daisy-chain dimer via ruthenium-catalyzed ring-closing olefin metathesis. Confirmation of the interlocked nature of the structure was achieved through single-crystal X-ray diffraction analysis. The dimer could be readily switched from the bound to the unbound conformation by treatment with 3.0 equiv of KOH and subsequently reprotonated by treatment with 3.0 equiv of HPF_6. Azide functionalization of the dimer enabled incorporation in linear step-growth polymer chains using the alkyne-azide “click” reaction. Gel permeation chromatography coupled with multiangle laser light scattering analysis showed the polymers contained 22 dimers and had a radius of gyration of 14.8 nm. Acylation of the amines of the dimers sterically forced elongation of the interlocked units, and MALLS analysis of the polymer showed a 48% increase in the R_g (21.4 nm)
Energy Conservation Analysis
There are many building simulation programs on the
market that calculate the annual energy use for a
facility. These programs are difficult to for use in
energy conservation projects. The designer must run a
complete simulation for each intended design or
systems modification. This can be time consuming
and expensive.
This report describes a program that performs an
energy analysis in a way that is much more convenient
for the energy analyst. Several common conservation
projects are featured in the program: tinting glass,
single-to-double pane conversion, adding roof
insulation, savings from landscape features, external
wall shading and reduction in outside air. Each of
these are evaluated in a separate building load
subroutine.
The program computes and displays the annual load
profile for each of these components of the envelope. It
can then calculate the exact savings possible, for
example, by modifying south-facing window, or by
planting fast-growing shade trees to the west of the
building. This is to permit the user to focus limited
funds on specific projects.
The analysis takes into account geographic location,
ambient temperature and latitude. It also permits the
user to modify these parameters to conform to unique
local conditions. The software will rotate a building as
well, to discern the effect on loads of a change in
building orientation.
Another feature is the ability to separate the building load by specific elements. Each screen used to input glass, roof, wall or floor data also gives a reading on the load attributed to that particular element alone, (e.g. each individual wall, window or roof section) converted into annual energy use. This is useful to the designer as it gives a relative perspective on the building load, of changes in insulation, glass area or wall color.
The program is complete with help screens, pull-down menus, input help and range constraints on data entry. It also has a full range of data editing review and print-out features
The Use of a Ballistic Galvanometer and Pendulum for Measuring Rapidly Fluctuating Resistances
The degree of accuracy with which physicists have divided the fundamental units of length and mass, the centimeter and the gram, demands a division equally as accurate of the remaining unit, the unit of time. We are all familiar with Michelson\u27s measurement of the standard meter where a half and a quarter wave length of light was a quantity not to be neglected. Our recent literature describes a balance which will weigh to one millionth of a milligram. When we consider these facts and the added fact that time so often enters into our formulae to the second degree we see the necessity of accurate small divisions of our unit of time
Lowest Order Constrained Variational Calculation of the Polarized Nuclear Matter with the Modern Potential
The lowest order constrained variational method is applied to calculate the
polarized symmetrical nuclear matter properties with the modern
potential performing microscopic calculations. Results based on the
consideration of magnetic properties show no sign of phase transition to a
ferromagnetic phase.Comment: 19 pages, 6 figure
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