scholarly journals LIST OF SYRPHIDÆ TAKEN IN FAIRMOUNT PARK, PHILADELPHIA, PA., DURING THE SUMMER OF 1884

1884 ◽  
Vol 16 (8) ◽  
pp. 145-147
Author(s):  
E. L. Keen
Keyword(s):  
New Jersey ◽  
The Sun ◽  
The Past ◽  
Small Wood ◽  
Past Summer

The species in the following list were taken in Fairmount Park during the past summer, and mainly during May and June, which is the best time for Syrphidæ; then there are some which only appear in the fall months. Of all families of Diptera the Syrphidæ seem to be better represented in the Park than any other families of this order, perhaps with the exception of the Dolichopodidæ. The Syrphidæ seem to prefer damp and somewhat open woods, especially a small wood that has a small rivulet running through, near the border, and where there are patches of May apple, with the sun shining through the trees on the plants. This only applies to some species, for others prefer the borders of woods, fields, etc. I never found many Syrphidæ in a hot and sandy county, for instance like New Jersey, but what it lacks in Syrphidæ it makes up with the Bombylidæ, for last summer I took about ten species of the latter family in one day, while I only took about seven species the whole summer in Fairmount Park.

scholarly journals A note on some further determinations of the dielectric constants of organic bodies and electrolytes at very low temperatures

1898 ◽  
Vol 62 (379-387) ◽  
pp. 250-266 ◽  
Keyword(s):  
Dielectric Constant ◽  
Low Temperatures ◽  
Tuning Fork ◽  
Dielectric Constants ◽  
The Past ◽  
Method Of Measurement ◽  
The Given ◽  
Past Summer

In several previous communications we have described the investigations made by us on the dielectric constants of various frozen organic bodies and electrolytes at very low temperatures. In these researches we employed a method for the measurement of the dielectric constant which consisted in charging and discharging a condenser, having the given body as dielectric, through a galvanometer 120 times in a second by means of a tuning-fork interrupter. During the past summer we have repeated some of these determinations and used a different method of measurement and a rather higher frequency. In the experiments here described we have adopted Nernst’s method for the measurement of dielectric constants, using for this purpose the apparatus as arranged by Dr. Nernst which belongs to the Davy-Faraday Laboratory.

scholarly journals VIII. Account of experiments on torsion and flexure for the determination of rigidities

1867 ◽  
Vol 157 ◽  
pp. 139-153 ◽  
Keyword(s):  
The Past ◽  
Past Summer

In my Paper read February 22nd, 1866, the intention was expressed of continuing my experiments on rigidity with a modified form of apparatus. This intention was carried out during the past summer, and I have now to report the results. In the former experiments, the rod operated on was supported at both ends, and was bent or twisted by hanging a pair of equal weights so as to act symmetrically on both ends; and the amounts of flexure and torsion were measured by the movements of two images formed by reflection upon a screen.

scholarly journals Theoretical Review of Secular Instabilities in the Sun

1980 ◽  
Vol 5 ◽  
pp. 441-444
Author(s):  
M. Gabriel
Keyword(s):  
Inner Core ◽  
Neutrino Flux ◽  
Radial Oscillation ◽  
Solar Model ◽  
The Sun ◽  
Standard Solar Model ◽  
The Past ◽  
Low Order

In this review we discuss the problems raised by the discovery that the sun was, in the past, unstable towards non-radial oscillations.In 1972, Fowler (1972), in an attempt to explain the low-neutrino flux measured in Davis’ experiment (now 1.6 snu, while the standard solar model predicts 4.4 snu) suggested that the sun could have undergone, some 10 years ago, a change in structure because of sudden mixing of the inner core. During the same year Dilke and Gough (1972) suggested the sun is unstable to low-order gravity modes (g+ modes) of non-radial oscillation and that the mixing is triggered when the amplitude of the oscillation becomes large enough.

scholarly journals On an Internal Parasite (Hym.—Chalcidoidea) of a Thrips from Trinidad

1923 ◽  
Vol 13 (4) ◽  
pp. 453-455 ◽  
Author(s):  
James Waterston
Keyword(s):  
Prepupal Stage ◽  
The Past ◽  
Internal Parasite ◽  
Past Summer

During the past summer Mr. F. W. Urich, Government Entomologist, Trinidad, B.W.I., succeeded in rearing a number of small Chalcids from larvae of a thrips in the prepupal stage. The following description is based on part of this material.

scholarly journals Evidence for the Transfer of Corpuscles to Distant Parts of the Sun Following a Solar Radio Burst

1961 ◽  
Vol 14 (4) ◽  
pp. 540 ◽  
Author(s):  
RF Mullaly
Keyword(s):  
Radio Burst ◽  
Solar Radio ◽  
Brightness Distribution ◽  
Solar Radio Burst ◽  
The Sun ◽  
Time Intervals ◽  
The Past ◽  
Grating Interferometer ◽  
Half Power ◽  
East West

The brightness distribution of 21-cm radiation over the Sun's surface has been studied for the past four years with the Christiansen crossed-grating interferometer (Christiansen et al. 1961) at Fleurs near Sydney. The observations described here were made using one arm of this cross as a simple grating interferometer, providing a transit instrument with a fan beam of about 2' of arc resolution to half-power points in the east-west direction and very low resolution north-south. The Sun was scanned repeatedly from east to west at time intervals of approximately 4 min.

scholarly journals NOTES ON ARGYNNIS ALCESTIS EDW

1878 ◽  
Vol 10 (2) ◽  
pp. 37-38
Author(s):  
C. E. Worthington
Keyword(s):  
The Past ◽  
Past Summer

The occurrence of this species in considerable numbers in this vicinity has afforded an opportunity for comparison with A. aphrodite, the results of which are appended.It should be stated that although the number referred to is small, yet the unrecorded comparison of over two hundred examples of both species during the past summer has agreed fully with this. In the line before me are five females each of alcestis and aphrodite. In every case the general color of the upper surface is duller in aphrodite, the basal shading heavier and more extensive, and the black markings on primaries heavier; in two examples the color approaches that of A. cybele, while the examples of alcestis exhibit a uniform clear color with hardly any variation.

scholarly journals Small Scale Solar Magnetic Fields: Theory

1977 ◽  
Vol 4 (2) ◽  
pp. 241-250 ◽  
Author(s):  
N. O. Weiss
Keyword(s):  
Magnetic Fields ◽  
Field Strength ◽  
Solar Physics ◽  
Small Scale ◽  
The Sun ◽  
Solar Magnetic Fields ◽  
Solar Granulation ◽  
The Past ◽  
Maximum Field Strength ◽  
Maximum Field

One of the most exciting developments in solar physics over the past eight years has been the success of ground based observers in resolving features with a scale smaller than the solar granulation. In particular, they have demonstrated the existence of intense magnetic fields, with strengths of up to about 1600G. Harvey (1976) has just given an excellent summary of these results.In solar physics, theory generally follows observations. Inter-granular magnetic fields had indeed been expected but their magnitude came as a surprise. Some problems have been discussed in previous reviews (Schmidt, 1968, 1974; Weiss, 1969; Parker, 1976d; Stenflo, 1976) and the new observations have stimulated a flurry of theoretical papers. This review will be limited to the principal problems raised by these filamentary magnetic fields. I shall discuss the interaction of magnetic fields with convection in the sun and attempt to answer such questions as: what is the nature of the equilibrium in a flux tube? how are the fields contained? what determines their stability? how are such strong fields formed and maintained? and what limits the maximum field strength?

MEASURING SOLAR DIAMETER WITH 2012 VENUS TRANSITS

2013 ◽  
Vol 23 ◽  
pp. 451-453 ◽  
Author(s):  
COSTANTINO SIGISMONDI
Keyword(s):  
Past History ◽  
Logarithmic Derivative ◽  
Solar Limb ◽  
Absolute Calibration ◽  
The Sun ◽  
Solar Diameter ◽  
The Past ◽  
History Of ◽  
Better Than

The role of Venus and Mercury transits is crucial to know the past history of the solar diameter. Through the W parameter, the logarithmic derivative of the radius with respect to the luminosity, the past values of the solar luminosity can be recovered. The black drop phenomenon affects the evaluation of the instants of internal and external contacts between the planetary disk and the solar limb. With these observed instants compared with the ephemerides the value of the solar diameter is recovered. The black drop and seeing effects are overcome with two fitting circles, to Venus and to the Sun, drawn in the undistorted part of the image. The corrections of ephemerides due to the atmospheric refraction will also be taken into account. The forthcoming transit of Venus will allow an accuracy on the diameter of the Sun better than 0.01 arcsec, with good images of the ingress and of the egress taken each second. Chinese solar observatories are in the optimal conditions to obtain valuable data for the measurement of the solar diameter with the Venus transit of 5/6 June 2012 with an unprecedented accuracy, and with absolute calibration given by the ephemerides.

INDEX OF SUSPICION

1996 ◽  
Vol 17 (6) ◽  
pp. 221-223
Author(s):  
Linda S. Nield ◽  
Jonette E. Keri ◽  
Randall G. Fisher ◽  
Nasha't M. Khanfar
Keyword(s):  
Early Diagnosis ◽  
Late Spring ◽  
The Sun ◽  
Erythematous Rash ◽  
The Past ◽  
General Pediatrician ◽  
Case Presentations

This section of Pediatrics in Review reminds clinicians of those conditions that can present in a misleading fashion and require suspicion for early diagnosis. Emphasis has been placed on conditions in which early diagnosis is important and that the general pediatrician might be expected to encounter, at least once in a while. The reader is encouraged to write possible diagnoses for each case before turning to the discussion, which is on the following page. We invite readers to contribute case presentations and discussions. Case 1 Presentation A 10-year-old boy is brought to your office in late spring because of an erythematous rash on his arms and legs that has been present for 4 days and because he is having joint pains. The rash first appeared after the boy had been playing outdoors for several hours in the sun. He did have a new commercial sunblock lotion applied to his skin before going outdoors. His father is concerned because even though the rash is less pronounced, his son has been experiencing stiff and painful knees and ankles upon awakening for the past 2 days. The joint discomfort improves with movement during the day. The boy has had no other symptoms and has been free of fever.

Introduction

2015 ◽  
Author(s):  
Joanna D. Haigh ◽  
Peter Cargill
Keyword(s):  
Climate Change ◽  
Magnetic Field ◽  
Human Activity ◽  
The Sun ◽  
The Past ◽  
Key Features ◽  
Composition Structure ◽  
Earth’S Climate ◽  
Fundamental Requirement

This introductory chapter provides an overview of the Earth's climate system—its composition, structure, and circulation—and some of the ways in which these vary naturally with time. It examines the key features of the structure of the Sun, its magnetic field, atmosphere, and its emission of radiation and particles. A comprehension of how the sun affects the Earth is a fundamental requirement for understanding how climate has varied in the past and how it might change in the future. This is particularly important in the context of determining the cause(s) of climate change and understanding natural factors in order to be able to attribute to human activity any past or potential future influence on a range of timescales.

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