1,440 research outputs found
Large aquatic animals
The following paper on the existence of large animals,
(probably fresh water seals)
in the upland lakes of Tasmania,
prepared by C. Gould, Esq., F.G.S., was, in Mr. Gould's
absence, read at the last meeting of the Royal Society:
—
I wish to lay before the Society a statement of facts, which
is full of interest and surprise, and which will show, if corroborated
by further investigations, that the existence of rare,
perhaps undescribed, animals may be generally unknown, and
entirely so to science, for long periods after the occupation of
a country
The islands in Bass' Straits
Visits to the islands in Bass' Straits are so rare that I feel
certain the members of this Society will accept a contribution
to the natural history of the group without objecting to its
brevity, and to its somewhat desultory character, induced by
limited opportunities of observation
On the distribution and habits of the large fresh-water crayfish (Astacus sp.) of the northern rivers of Tasmania
I trust that the members of this Society may be interested
in a few remarks, which I have to make upon the distribution
and habits of the large fresh-water crayfish which is so
common upon the north side of the island.
I am not aware that this has been specifically described by
naturalists, although its unusually large size, abundance in
certain localities, estimation as a delicacy for the table, added
to its facility of capture and observation should long since
have acquired for it that attention at their hands
Alien Registration- Gould, Charles H. (Newport, Penobscot County)
https://digitalmaine.com/alien_docs/8168/thumbnail.jp
Large Scale Human Benefits from the Industrialization of Space
This paper summarizes the results to date on an 18-month study on Space Industrialization performed for NASA-MSFC by Rockwell International. This study is in two parts. Part 1 addressed the what and why of Space Industrialization; Part 2 will address the how . This paper highlights important future world needs and trends in which space can potentially play a part, and identifies the specific recommendations for the evolutionary industrialization of space. The space opportunities that are applicable to future national and world needs are listed, and these opportunities are assessed. They cover the broad areas of Space Industrialization: (I) information services, both transmission and data acquistion; (2) energy...in the form of light or converted to microwaves and beamed to earth for conversion to electricity; (3) materials ...manufactured in orbit using terrestrial materials, materials from the moon, or materials from outside cislunar space; (4) weather, environment and climate monitoring, predicting, or controlling; and (5) other uses of space including human activities such as medical treatment and tourism. During the study several Space Industrialization program options were identified and the various viable opportunities were integrated into evolving programs, each with a step-by-step development of the required hardware and returning intermediate benefits leading toward longer range goals. The paper discusses an assessment of these program options, including the benefits incurred and the hardware items necessary to implement the overall recommended program
Statistics of Cosmological Black Hole Jet Sources: Blazar Predictions for GLAST
A study of the statistics of cosmological black-hole jet sources is applied
to EGRET blazar data, and predictions are made for GLAST. Black-hole jet
sources are modeled as collimated relativistic plasma outflows with radiation
beamed along the jet axis due to strong Doppler boosting. The comoving rate
density of blazar flares is assumed to follow a blazar formation rate (BFR),
modeled by analytic functions based on astronomical observations and fits to
EGRET data. The redshift and size distributions of gamma-ray blazars observed
with EGRET, separated into BL Lac object (BL) and flat spectrum radio quasar
(FSRQ) distributions, are fit with monoparametric functions for the
distributions of the jet Lorentz factor \Gamma, comoving directional power
l'_e, and spectral slope. A BFR factor ~10 x greater at z ~ 1 than at present
is found to fit the FSRQ data. A smaller comoving rate density and greater
luminosity of BL flares at early times compared to the present epoch fits the
BL data. Based on the EGRET observations, ~1000 blazars consisting of ~800
FSRQs and FR2 radio galaxies and ~200 BL Lacs and FR1 radio galaxies will be
detected with GLAST during the first year of the mission. Additional AGN
classes, such as hard-spectrum BL Lacs that were mostly missed with EGRET,
could add more GLAST sources. The FSRQ and BL contributions to the EGRET
gamma-ray background at 1 GeV are estimated at the level of ~10 - 15% and ~2 -
4%, respectively. EGRET and GLAST sensitivities to blazar flares are considered
in the optimal case, and a GLAST analysis method for blazar detection is
outlined.Comment: 17 pages, 9 figures, ApJ, in press, v.660, May 1, 2007 (minor changes
from previous version
Robert V. Langmuir
Robert V. Langmuir, professor emeritus of electrical engineering at Caltech and a member of the team that first directly observed synchrotron radiation, died of cancer on 7 May 1992, at the age of 80. Langmuir had had a long and productive career as an educator, physicist, engineer and inventor
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