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Articles 286351 - 286380 of 293416
Full-Text Articles in Physical Sciences and Mathematics
Pool Studies, Walter A. Lawrance
Press Reports, Walter A. Lawrance
Analytical Data, Walter A. Lawrance
Simulated Radioactivity, Robert Katz, J. J. Butts
Simulated Radioactivity, Robert Katz, J. J. Butts
Robert Katz Publications
An experiment to simulate radioactive decay is easily performed with a random-number generator or a set of random numbers. The nuclei are imagined to be indexed consecutively. The initial appearance of the index number of a particular nucleus is interpreted as a signal that it has disintegrated. The number of surviving nuclei is an exponential function of the number of draws, and represents the radioactive decay law, with fluctuations. This procedure is a precise realization of the conventional probabilistic derivation of the radioactive decay law if, indeed, the random number generator is truly unbiased.
Test 947: John Deere 5020 Diesel, Nebraska Tractor Test Lab
Test 947: John Deere 5020 Diesel, Nebraska Tractor Test Lab
Nebraska Tractor Tests
No abstract provided.
Blackbird Damage And Control--An Informal Seminar, M. I. Dyer
Blackbird Damage And Control--An Informal Seminar, M. I. Dyer
Bird Control Seminars Proceedings
The object is to hash over a few problems as we see them on this red-winged blackbird situation. I'm Mel Dyer, University of Guelph, Guelph, Ontario. Around the table are Tom Stockdale, Extension Wildlife Specialist, Ohio Cooperative Extension Service, Columbus; Maurice Giltz, Ohio Agriculture Research and Development Center, Wooster, Ohio; Joe Halusky, U.S. Fish and Wildlife Service, Columbus, Ohio; Daniel Stiles, U.S. Fish and Wildlife Service, Washington, D.C.; Paul Rodeheffer, U.S. Fish and Wildlife Service, Columbus, Ohio; Brian Hall, Blackbird Research Project, University of Guelph, Guelph, Ontario; George Cornwell, Virginia Polytechnic Insti¬tute, Blacksburg, Va.; Dick Warren, Peavey Grain Company, Minneapolis, …
Blackbird Depredations In Animal Industry: Feedlots, Donald Balser
Blackbird Depredations In Animal Industry: Feedlots, Donald Balser
Bird Control Seminars Proceedings
Reviewing the cattle feedlot problems in the west, we have cattle feedlots near most of our large population centers and in some cases they are located near supplies of rations, such as potatoes in Idaho or beet pulp, milo, etc. Perhaps the greatest number of feedlots are in California which has our largest human population but there are also large operations in Utah, Idaho, Oregon, Colorado, Nevada, New Mexico, and Arizona which have reported bird damage problems. Later on in the program we'll have a film taken by our bird project personnel of work in feedlots in Colorado so I'll …
On The Symmetry Of Slater Determinantal Wavefunctions, Gordon A. Gallup
On The Symmetry Of Slater Determinantal Wavefunctions, Gordon A. Gallup
Gordon Gallup Publications
A method involving the use of characteristic polynomials of irreducible representation matrices of groups and yielding the symmetry species of Slater determinantal functions is given. The necessary polynomials have been calculated for the commonly occurring symmetry groups and are listed to supplement the usual character tables. ©1966 American Institute of Physics
Blackbird Depredations In Animal Industry: Poultry Ranges And Hog Lots, C. E. Faulkner
Blackbird Depredations In Animal Industry: Poultry Ranges And Hog Lots, C. E. Faulkner
Bird Control Seminars Proceedings
I'm going to move over onto poultry ranges, turkey ranges and hog farms where we have species of birds such as the herring gull, the pigeon, the starling and English sparrow. As a rule, these birds travel relatively great distances from roosts and loafing areas out to the feeding ranges. And why shouldn't they? There is ample high energy food available and usually lack of human disturbance. So they frequent these places during the daylight hours. Actually the losses from these operations are pretty hard to evaluate. Sometimes it is direct, the farmer feels the impact; other times it's indirect. …
Bird Damage In Fruit Crops, Richard N. Smith
Bird Damage In Fruit Crops, Richard N. Smith
Bird Control Seminars Proceedings
I don't see any solution in sight for fruit damage caused by birds. I think that one of the reasons is that there has been very little research done concerning the relationship between birds and fruit crops. Probably the reason is that those birds responsible are protected species, and they are highly desirable birds in the eyes of the public. For instance, one of the species that is responsible for heavy losses in fruit crops is the robin. It is the state bird in Michigan, yet it causes a number of problems there each year. Another problem is that growing …
New Materials From Research, Donald Balser
New Materials From Research, Donald Balser
Bird Control Seminars Proceedings
At the Denver Wildlife Research Center our people are actively searching for means of controlling damage by a whole host of animal and bird species. I say controlling damage rather than controlling species because this should be the primary objective. If we can do this without lethal control, so much the better, and it may be the more lasting solution in the long run. Often removal of some animals by lethal means either increases reproduction, survival, or invasion unless complete control is exercised over sufficiently large areas. In spite of these problems, population reduction is often relied on as a …
Bird Control Methods And Devices--Comments Of The National Pest Control Association, Philip J. Spear
Bird Control Methods And Devices--Comments Of The National Pest Control Association, Philip J. Spear
Bird Control Seminars Proceedings
It may be useful to review some of the considerations that go into recommendations concerning bird management. Later I will make some comments concerning specific methods and devices being used in or promoted for bird control work regardless of whether or not they are new. Members of the National Pest Control Association provide a variety of services, such as fumigation, termite control and general pest control which includes rodent control. There are eight such categories listed in our roster, but only one member in five provides every service listed. Bird control is a rather recent development and is the newest …
Good Practice In Bird Management, James W. Steckel
Good Practice In Bird Management, James W. Steckel
Bird Control Seminars Proceedings
I'm going to deviate a little bit from what's been said. I'd like to read to you first of all a Good Practice Statement for Bird Management that was accepted by the National Pest Control Association in the past year, 1965. I think it's important for all the people here, realizing that some of you are suppliers, some of you are from regulatory agencies, some of you are in the bird management business, and others are in¬terested in this field in many other ways. It's important for us to realize, all of us, that this field is just in the …
Agricultural Bird Problems In The West, Donald Balser
Agricultural Bird Problems In The West, Donald Balser
Bird Control Seminars Proceedings
First, I'd like to qualify geographically, the area where most of our work is done and problems occur. It is primarily in the Rocky Mountain states and the west coast. While the area of the Denver Wildlife Research Center's responsibility covers the states west of the Mississippi River; the only area on the plains where our personnel have conducted intensive studies outside of Colorado is in South Dakota. The major bird problems in grain crops in the west are primarily caused by blackbirds excepting, of course, waterfowl depredations. It's difficult to rank the principal crops according to seriousness of losses. …
Control Of Birds In Aircraft Hangars, Richard N. Smith
Control Of Birds In Aircraft Hangars, Richard N. Smith
Bird Control Seminars Proceedings
What I am going to say this afternoon about bird control in hang¬ars won't take but a few minutes, mainly because I think this is one area that we already have partial solutions. By this I mean that in most instances, at least where I've worked, we've been able to solve most of the hangar bird problems. Some of you have probably worked on similar problems or have worked in airplane hangars and after the session I'll certainly welcome any comments you may have. What I have to say will relate mainly to what I've done myself, or the men …
Side Effects Of Persistent Toxicants, George J. Wallace
Side Effects Of Persistent Toxicants, George J. Wallace
Bird Control Seminars Proceedings
As you can see from the general tenor of the printed program for this seminar, I am in the unenviable position of trying to discourage you from certain types of chemical control; but my assigned topic "Side Effects of Persistent Toxicants," implies that mission. However, my remarks may be somewhat anticlimax at this time, because it is now generally conceded that we need to reevaluate certain chemicals in control work and to restrict or severely curtail use of those that per¬sist for long periods in the environment. So let me detail my reasons for a somewhat negative attitude toward the …
Agricultural Bird Problems In The Midwest And East, Maurice L. Giltz
Agricultural Bird Problems In The Midwest And East, Maurice L. Giltz
Bird Control Seminars Proceedings
We recognized this bird damage problem from an agricultural standpoint around 1950. It seemingly was growing and when we looked into it; it later appeared that this was the case. The problem was quickly resolved to be primarily red-winged blackbirds in corn. We also have problems of damage to fruit crops such as apples, or peaches by starling and other birds, in grapes probably by warblers and most certainly star¬lings in certain seasons. But, this isn't as consistent and persistent at the corn damage by red-winged blackbirds. We began about 8 years ago to make a survey and we got …
Histoplasmosis--Its Relationship To Birds, E. R. Price Ph.D.
Histoplasmosis--Its Relationship To Birds, E. R. Price Ph.D.
Bird Control Seminars Proceedings
Histoplasmosis is a disease affecting man and many other ani¬mals including the dog, cat, cow, horse, and several wild animals. It is caused by a pathogenic fungus known as Histoplasma capsulatum. This fungus lives and multiplies in the ground as a mold. It prefers the undisturbed litter in and around old chicken houses or in undis¬turbed droppings under bird roosts. It has been found in the soil of dog kennels, under porches of old houses, under trees and bushes frequented by birds in the daytime. It has also been found in isolated caves and hollow trees. It apparently is capable …
Chemosterilants, Possible Control Agents, Robert Mclean
Chemosterilants, Possible Control Agents, Robert Mclean
Bird Control Seminars Proceedings
A chemosterilant may be defined as a chemical compound that reduces or destroys fertility of the treated animal. There are a variety of compounds which have an anti-fertility effect, and these com¬pounds may attack the reproductive process at any one of its many phases. Chemosterilants have a good potential as a means of population control of pest animals, because the population may be reduced with little reproductive compensation which normally follows a reduction caused by killing. The number of young produced would be reduced by preventing reproduction or by causing early mortality; therefore, there would be little compensatory increase in …
Control Of Birds In The Airport Environment, C. E. Faulkner
Control Of Birds In The Airport Environment, C. E. Faulkner
Bird Control Seminars Proceedings
We now move from the inside of the hangar to the outside and view the problem of birds on runways and taxiways. The increased use of aircraft for transportation and the increased use of jet aircraft to take care of this transportation will, of course, compound our bird problems at major airports. To lesson this probability of the bird-aircraft strike, bird management plans should be initiated at these var¬ious commercial airports so we can lessen the bird problem. To show you some of the mechanics involved in a bird management plan, I'm going to take you to a typical airport …
Blackbird Flock Behavior In Corn, A Theoretical Model (With Session Discussion), M. I. Dyer
Blackbird Flock Behavior In Corn, A Theoretical Model (With Session Discussion), M. I. Dyer
Bird Control Seminars Proceedings
I realized this past winter that redwings form the base for an international problem, and so I went down to see Jim Caslick in Florida. Unfortunately, I picked the wrong season. I misjudged the weather for when I went down in May to get experimental birds it was pretty hot. Next year I'll be a bit more careful and go down during the winter time. I want to discuss something a bit different but still in line with crop damage by red-winged blackbirds. I want to relate the damage assessment that we're making in agricultural corn to bird behavior. We've …
Frontmatter & Opening Remarks, 3rd Bird Control Seminar, William B. Jackson
Frontmatter & Opening Remarks, 3rd Bird Control Seminar, William B. Jackson
Bird Control Seminars Proceedings
Bowling Green State University, Bowling Green, Ohio, September 13-15, 1966.
Sponsored by the Department of Biology, Bowling Green State University, with the assistance of Division of Wildlife Services, United States Fish and Wildlife Service, and the National Pest Control Association, Elizabeth, New Jersey.
Dr. William B. Jackson, Conference Chairman; David E. Schneider, Conference Assistant; David E. Schneider and William B. Jackson, Editors.
Metropolitan And Industrial Bird Problems: Panel Discussion, Harold Coleman, Anthony Clay, Kilmer Bortz
Metropolitan And Industrial Bird Problems: Panel Discussion, Harold Coleman, Anthony Clay, Kilmer Bortz
Bird Control Seminars Proceedings
As a pest control industry, we are interested in bird control, especially in areas of residence, commercial buildings, food plants, mills and elevators, commercial feed lots, farms, and even area wide controls in some of our cities. We run into all kinds of problems; I suppose you men do, too.
Ecological Control Of Bird Hazard To Aircraft, V. E. F. Solman
Ecological Control Of Bird Hazard To Aircraft, V. E. F. Solman
Bird Control Seminars Proceedings
The Canadian Wildlife Service has had twenty-five years experience with the problem caused by bird contacts with aircraft. I experienced my first bird strike, while flying as an observer on a waterfowl survey in August, 1940. Officers of the Service investigated bird problems at airports at Yarmouth, Nova Scotia, and Cartierville, Quebec, in the late 1940's. Those incidents involving gulls and low speed piston-engined aircraft caused minor damage to the aircraft but considerable disturbance to the operators. As aircraft speeds increased and airports became more numerous and busier the problem increased in extent and complexity. By 1960 it was apparent …
Population Dynamics Of Pest Birds, Robert Mclean
Population Dynamics Of Pest Birds, Robert Mclean
Bird Control Seminars Proceedings
We want to talk now about population principles; this is our main problem dealing with populations. We should discuss the general application of population principles and the management of bird populations. The reason we can discuss this is because many species follow established principles; population growth and later regulation of its size follow certain basic rules. Many pest species follow these principles, but not always to the letter. Populations of different species, as well as of a species, vary depending upon local conditions. Local environments dictate what population levels and the growth of populations will be. Minor variabilities still fit …
Agricultural Bird Problems In The Southeast, James Caslick
Agricultural Bird Problems In The Southeast, James Caslick
Bird Control Seminars Proceedings
Our chairman has wisely asked that we not spend all of our time here telling each other about our bird problems. In the Southeast, our difficulties with blackbirds are based upon the same bird habits that cause trouble elsewhere: they flock, they roost and they eat, generally taking advantage of the readily available handouts that today's agricul¬tural practices provide. Those of us on the receiving end of these de¬predations of course think that damage in our own particular area must be far the worst, anywhere. Because of the location of our meeting place today, perhaps it is worthwhile to point …
Table Of Contents -- Proceedings Third Bird Control Seminar
Table Of Contents -- Proceedings Third Bird Control Seminar
Bird Control Seminars Proceedings
No abstract provided.
Twelve Maps Summarizing The Geologic Framework Of Southeastern Nebraska, R. R. Burchett, M. P. Carlson
Twelve Maps Summarizing The Geologic Framework Of Southeastern Nebraska, R. R. Burchett, M. P. Carlson
Conservation and Survey Division
No abstract provided.
Model Of Electron Correlation In Solids, Everett G. Larson, Walter R. Thorson
Model Of Electron Correlation In Solids, Everett G. Larson, Walter R. Thorson
Faculty Publications
The usual Hartree-Fock model (energy-band theory) does not always give an adequate description of electronic structure in a solid, because it ignores the effects of electron correlation. It was shown first by Wigner that such a situation always develops in an electron ''gas'' at sufficiently low density; a solid structure described by ''resonance'' of Heitler-London pair bonds between electrons localized on neighboring atoms is then a good model of the system.The transition from a Bloch-type state to such a highly correlated state as a function of electron density (lattice parameter) is a problem of considerable interest for the theory of …
Mineralized Springs In Utah And Their Effect On Manageable Water Supplies, James H. Milligan, Ray E. Marsell, Jay M. Bagley
Mineralized Springs In Utah And Their Effect On Manageable Water Supplies, James H. Milligan, Ray E. Marsell, Jay M. Bagley
Reports
Need and Importance of Study
Water demands in Utah are continuously increasing. It is essential that these demands be me to insure the continued enhancement of the social and economic well-being of all sectors of our society. Since water needs must be met from a relatively fixed water supply it is imperative that supplies be managed for complete utilization in such a way that all legitimate requirement scan be satisfied.
As our available water supplies are used more completely by making a given supply satisfy more than one use, water quality problems become more pronounced. The multiplicity of uses to …