Chemistry: Agricultural Chemistry

Aquatic Plant Control Research Program: Triclopyr (Garlon 3A) dissipation in Lake Seminole, Georgia

MAR 89

Authors: Joseph C. Joyce; William T. Haller; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB

The full text of this report is not available and therefore is not for sale. This information is provided for reference purposes only.

A liquid formulation of triclopyr (Garlon 3A) was applied under Experimental Use Permit at proposed maximum rates to areas of Lake Seminole, GA, in order to examine herbicide dissipation and environmental fate. Residue persistence varied between the two treated plots. Triclopyr residues persisted in water above detectable levels through posttreatment day 3 in one plot and through posttreatment day 21 in the other. The residue half-life for the two plots ...

JPRS Report, Science & Technology, USSR: Chemistry

24 FEB 89

Authors: JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA

This report contains foreign media information from the USSR concerning analytical chemistry, electrochemistry, fertilizers, inorganic compounds, petroleum coal processing and polymers.

Novel Tests for Rapid Detection of Insecticide Resistance in Mosquito Vectors

31 JAN 89

Authors: George P. Georghiou; CALIFORNIA UNIV RIVERSIDE DEPT OF ENTOMOLOGY

This project is concerned with the formulation of novel diagnostic tests for the detection of organophosphate (OP) resistance in individual mosquitoes. Emphasis was placed on the mechanisms of detoxification by esterases and of insensitive acetycholinesterase. Seven diagnostic tests have resulted from this research to date. Five concern esterases, and two insensitive acetylcholinesterase. An eighth procedure concerns the qualification of proteins in single insects and is used in conjunction with other ...

Assessment of the Relative Toxicity of Candidate Insect Repellent 1-(3- Cyclohexex-1-YL Carbonyl) Hexahydro-1H-Azepine, AI3-35766, Study No. 75-51-0491- 89

JAN 89

Authors: Maurice H. Weeks; John G. Harvey; ARMY ENVIRONMENTAL HYGIENE AGENCY ABERDEEN PROVING GROUND MD

A series of studies was performed in laboratory animals and in vitro biological systems to determine the relative toxicity of the candidate insect repellent, AI3-35766. The studies indicated that the subject compound exhibited a potential for skin irritation, eye irritation sensitization, and mutagenicity. It was recommended that no further laboratory studies be conducted on the candidate repellent AI3-35766. (aw)

New Analytical Methods for the Fungicides Para-Nitrophenol, 2, 2'- Methylene Bis-(4-Chlorophenol), Salicylanilide and Copper 8-Quinolinolate

NOV 88

Authors: Joseph A. Akkara; Marvin Greenberger; David Kaplan; ARMY NATICK RESEARCH DEVELOPMENT AND ENGINEERING CENTER MA

Analytical methods for the quantitation of four fungicides - para- nitrophenol, 2,2'-methylene bis-(4-chlorophenol), salicylanilide and copper 8- quinolinolate - were developed and are described. The analytical methods for fungicides in the existing military specifications are labor intensive, involving multiple steps, including and not limited to extractions, washings, pH and volume adjustments. Also these methods are not accurate because of interferences from other substances present in the materials being tested. The ...

U.S. Air Force Installation Restoration Program Remedial Investigation of Former Herbicide Storage Site at Johnston Island, Pacific Ocean

30 SEP 88

Authors: MARTIN MARIETTA ENERGY SYSTEMS INC OAK RIDGE TN

This report represents a synthesis and reformatting of six primary documents and other related materials on soils, ocean sediments, air, and biota investigations conducted at Johnston Island (JI), Pacific Ocean, to characterize contamination resulting from storage of 1.37 million gallons of Herbicide Orange (HO) from 1972 through 1977. The individual study components comprise the Remedial Investigation (RI) of the former HO storage site at JI. This report describes the procedures, ...

Migration of Permethrin from Military Fabrics Under Varying Environmental Conditions. Phase 2

13 SEP 88

Authors: Hubert L. Snodgrass; Patricia A. McGreal; ARMY ENVIRONMENTAL HYGIENE AGENCY ABERDEEN PROVING GROUND MD

Clothing treated with the insecticide permethrin offers near complete protection against insect vectors when used in conjunction with topical insect repellents. Of concern is the leaching of permethrin from the military battle dress uniform (BDU) and the potential for skin absorption by the wearer. Migration of permethrin from two types of BDU fabrics, 100 percent cotton and a nylon/cotton blend (NYCO), was tested in animals. Swatches of fabric (50 cm2) ...

Small Strain Response of Random Arrays of Elastic Spheres Using a Nonlinear Distinct Element Procedure

JUL 88

Authors: Emmanuel Petrakis; Ricardo Dobry; Tang-Tat Ng; RENSSELAER POLYTECHNIC INST TROY NY DEPT OF CIVIL ENGINEERING

Granular soil is presented in this work by 2-D random arrays of elastic, rough, quartz sphere using the 'distinct element' method. The original 3-D computer code TRUBAL, originally developed by Peter Cundall, has been modified at RPI by the introduction of a general solution to the Hertz-Mindlin contact problem. This was achieved by attaching a subroutine to the original code, which describes the nonlinear force-displacement relationship at the intergranular contacts, ...

Evaluation of Products for Control of Mosquitoes at Disposal Sites in the Galveston District

JUN 88

Authors: Alfred F. Cofrancesco Jr.; Jeffrey W. Flosi; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB

Dredged material disposal areas provide breeding habitats for high numbers of mosquitoes. The close proximity of many of these sites to human populations often requires the initiation of mosquito control measures. Such control measures are sometimes hampered by the density of the vegetation canopy present within the disposal sites. Nine mosquito larvicide products wer tested for their ability to disperse and penetrate vegetation canopies of varying densities at a disposal ...

A Membrane Perfusion Method for On-Site Determination of Minimum Effective Release Rates of Antifoulants

JUN 88

Authors: Elizabeth B. Gates; DAVID TAYLOR RESEARCH CENTER BETHESDA MD SHIP MATERIALS ENGINEERING DEPT

Antifouling (AF) coatings are designed to prevent biofouling by releasing bioactive compounds over 5-7 years at a controlled rate. Because biocides are also toxic to non-target organisms, environmental damage may result. Release rates of biocides in most AF paints are probably several times higher than necessary to prevent significant fouling. Decreased release rates could lessen environmental damage. This research was to determine the minimum release rate of biocides which will ...

Department of Energy Technology

MAR 88

Authors: B. Micheelsen; F. List; RISOE NATIONAL LAB ROSKILDE (DENMARK)

One effort was the dismantling of the first 2 MW circulating fluid bed reactor; following this, and advanced circulating fluid bed system, with an automated control system, steam generator, and coal and straw feeding systems, was designed and constructed. Another development was that the basin modelling project, where a 3-dimensional basin model is being used in evaluating the oil- gas potential of three Danish locations. The main activities in the ...

Hit-and-Run Immunoassay for T-2 Toxin

20 JAN 88

Authors: Roger W. Giese; Kariman I. Allam; Douglas J. Cecchini; Markus Ehrat; Kai L. Guan; NORTHEASTERN UNIV BOSTON MA BARNETT INST OF CHEMICAL ANALYSIS AND MATERIALS S CIENCE

The trichothecenes are a group of fungal byproducts with a tetracyclic, sesquiterpenoid ring system. This group includes a number of poisonous compounds, one of which is T-2 toxin produced by fungi of the Fusarium species. This toxin has been isolated from mold found on wheat, barley, oats, and corn and has adverse biological effects on both plants and animals (1-5). For example, it has caused outbreaks of moldy corn toxicosis ...

Availability of Phosphorus in Cow Slurry Using Isotopic Labelling Technique

JAN 88

Authors: Pichit Pongsakul; Finn Bertelsen; Gunnar Gissel-Nielsen; RISOE NATIONAL LAB ROSKILDE (DENMARK)

Organic fertilizers, e.g., compost, green manure, farmyard manure, and farmyard slurry are not only important in improving the physical properties of soils but also provide mineral nutrients to plants. However, those nutrients in organic form must be mineralized before they are available to plants. Some organic fertilizers, especially farmyard manure and slurry, contain fairly large amounts of organic phosphorus (P), which must be mineralized before it can be utilized by ...

Quantitation of Nitroguanidine in Rodent Chow

JAN 88

Authors: Conrad Wheeler; Eric Dahlberg; John Ryabik; Don W. Korte Jr; LETTERMAN ARMY INST OF RESEARCH PRESIDIO OF SAN FRANCISCO CA

The assay described in this report was developed to verify the concentrations of nitroguanidine (NGu) in feed mixtures used in GLP animal studies. The target concentrations of NGu in the animal diets ranged from approximately 1 to 22 mg NGu/g feed. These diets were prepared using a mixture of feed (premix) with a much higher concentration of NGu (approximately 50 mg NGu/g feed). The assay employs High Pressure Liquid Chromatography ...

Topical Hazard Evaluation Program of Candidate Insect Repellents AI3- 38426, AI3-39008, AI3-39010, AI3-30106, AI3-38264, AI3-38265, AI3-38098, AI3- 38099 and AI3-5903, U.S. Department of Agricultural Proprietary Chemicals, January 1988

JAN 88

Authors: Maurice H. Weeks; ARMY ENVIRONMENTAL HYGIENE AGENCY ABERDEEN PROVING GROUND MD

The purpose of this report is to provide guidance for further entomological testing of the subject candidate insect repellents by means of laboratory animal studies. In addition, these data may be useful in developing preliminary safety guidelines for handling these compounds. Based on professional scientific judgement, the following recommendations are offered. a. Approve compounds AI3-38426, aAI3-39008, AI3-39010, AI3-30106, AI3-38264, AI3- 38265, AI-38098, AI3-38099, and AI3-5903 for further entomological testing. b. ...

Investigations in Fish Control. 95. Deposition and Persistence of Rotenone in Shallow Ponds During Cold and Warm Seasons

Authors: P. A. Gilderhus; V. K. Dawson; J. L. Allen; FISH AND WILDLIFE SERVICE WASHINGTON DC

We describe research performed in 1983 and 1984 on persistence of rotenone in the environment to meet current EPA requirements for continued registration. The objective of the studies was to determine where rotenone is deposited in the environment, in what amounts, and how long it stays there during different seasons. The studies were conducted in fall and summer in shallow ponds to determine the distribution and persistence of rotenone in ...

Contamination Assessment Report. Section 22 - Nonsource Area (Version 3. 1). Phase 1

DEC 87

44 pages

Authors: ENVIRONMENTAL SCIENCE AND ENGINEERING INC ENGLEWOOD CO

The full text of this report is available for sale.

This final report documents the Phase I contamination survey of Section 22 uncontaminated which has been used for agriculture and as a buffer zone. Twelve composite samples from 12 borings were analyzed for semivolatile organics and metals with separate analyses for Hg and As. Only one sample had a target compound, CD, with a concentration above the indicator range. However, this CD concentration is not considered indicative of disposal activity. ...

Air Force Health Study. An Epidemiologic Investigation of Health Effects in Air Force Personnel Following Exposure to Herbicides. First Followup Examination Results

OCT 87

Authors: George D. Lathrop; Stella G. Machado; Theodore G. Karrison; William D. Grubbs; Wanda F. Thomas; SCIENCE APPLICATIONS INTERNATIONAL CORP MCLEAN VA LIFE SCIENCE AND SYSTEMS DE PT

This report represents the results of the health assessment of the 1, 016 Ranch Hands and the 1,293 Comparisons who participated in the 1985 followup examination of the Air Force Health Study. The purpose of the study is to determine whether long-term health effects exist and can be attributed to occupational exposure to herbicides. The result show a subtle but consistent narrowing of medical differences between the two groups since ...

Gas Chromatographic Analysis of Permethrin, Niclosamide and Edolan U content of Military Materials

OCT 87

Authors: J. M. Mayer; D. L. Kaplan; A. M. Kaplan; ARMY NATICK RESEARCH DEVELOPMENT AND ENGINEERING CENTER MA

Permethrin, niclosamide, and EDOLAN U pesticides were extracted from Battle Dress Uniform (BDU) and wool materials and analyzed by gas chromatography (GC) in order to determine the recovery efficiency of these compounds from dyed materials using Soxhlet extraction followed by GC analysis. Permethrin and EDOLAN U extraction and quantification were both simple and accurate when electron capture detection was used because dye interferences were eliminated. Niclosamide analysis by GC was ...

Services Herbs Tape: A Record of Helicopter and Ground Spraying Missions, Aborts, Leaks, and Incidents

05 DEC 86

Authors: ARMY AND JOINT SERVICES ENVIRONMENTAL SUPPORT GROUP WASHINGTON DC

On 21 May 1980, the Army Agent Orange Task Force was formed to provide military research support to several government agencies concerned with possible adverse health effects of Vietnam veterans to the herbicide known as Agent Orange. Earlier, the National Academy of Sciences (NAS) conducted an investigation for the Defense Department to study the effects of herbicides used in Vietnam. During the conduct of the NAS study an automated data ...

Soil Characterization Study of Former Herbicide Storage Site at Johnston Island

OCT 86

Authors: A. B. Crockett; A. Propp; T. Kimes; EG AND G IDAHO INC IDAHO FALLS

This study examines the levels of 2,3,7,8-TCDD in surface soils at the former herbicide storage site on Johnston Island. In addition, subsurface samples were collected and analyzed for TCDD, 2,4-D, and 2,4,5-T. This study contains the samplings methods, analytical procedures, the levels of contaminants found in the soils at Johnston Island. The site was sampled in a systematic pattern to produce total site coverage. Samples collected from the areas surrounding ...

Controlled Release Personal Use Arthropod Repellent Formulation. Phase 2. Part 1

19 SEP 86

Authors: E. S. Nuwayser; N. H. Gay; D. J. DeRoo; P. D. Blaskovich; BIOTEK INC WOBURN MA

The overall objective of Phase II is to bring the prototype sustained release arthropod repellent formulation developed in Phase I to large scale manufacturing stage. This Phase II report details the work conducted during the past eight months for the development of a 12 hour sustained action arthropod repellent formulation. The work culminated in the development of BIOTEK sustained action Formulation 50I which meets virtually all the criteria and requirements ...

Controlled Release Personal Use Arthropod Repellent Formulation. Part 2

19 SEP 86

Authors: E. S. Nuwayser; M. H. Gay; D. J. DeRoo; P. D. Blaskovich; BIOTEK INC WOBURN MA

Between 1 May and 15 August 1986 field tests involving human subjects and natural mosquito populations were conducted at the Florida Medical Entomology Laboratory, University of Florida IFAS Field Station in Vero Beach, Florida on 3 slow release insect repellent formulations of deet (N, N-diethyl-m- tolumaide developed by BIOTEK, Inc. of Woburn, Massachusetts. These field tests were funded by a BIOTEK subcontract from a U.S. Army Grant awarded for the ...

Biochemical Mechanisms of Organophosphate Tolerance

01 SEP 86

Authors: Steven D. Cohen; Gerald Gianutsos; CONNECTICUT UNIV STORRS SCHOOL OF PHARMACY

The lethality of organophosphate cholinesterase inhibitors is thought to result from depression of the respiratory center in the brain stem, construction of and increased secretion by the airways, and paralysis of the respiratory musculature. While tolerance to the cholinergic toxicity of organophosphates has been well documented, such studies have not included investigations of the brain stem and extrapulmonary airways. In this report tolerance in mice to the insecticide malathion and ...

AFGL (Air Force Geophysics Laboratory) Balloon Telemetry Facility

15 AUG 86

Authors: Victor R. Parkerson; NEW MEXICO STATE UNIV LAS CRUCES PHYSICAL SCIENCE LAB

This report discusses the capabilities available at AFGL Detachment 1 for reception, collection, manipulation, recording, and display of telemetry data transmitted from balloon-borne instrumentation. Contents: General Description; Receiving Subsystem; PCM Telemetry Subsystem; PDP-11/40 Processor; PDP-11 Peripherals; Software; Timing; Data Display Subsystem; Magnetic Data Recording; Recommendations. (fr)

Aquatic Plant Control Research Program. Evaluation of 2,4-D/Adjuvant Mixtures in Flowing Water

MAY 86

Authors: Kurt D. Getsinger; Howard E. Westerdahl; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB

Four, 2,4-D DMA/adjuvant formulations (inverts Asgrow 403 and I'vod, and polymers Nalquatic and Poly Control) were evaluated for controlling Eurasian watermilfoil (Myriophyllum spicatum) in flowing water. Flow velocities of 1.5 to 3.0 cm/sec were used to evaluate 2,4-D release profiles determined by measuring herbicide residues in water collected 175 cm downstream from the treatment area. Herbicide release profiles from 2,4-D/adjuvant formulations were compared with herbicide release profiles from conventional 2,4-D ...

Measurement of Droplet Size Distribution in Insecticide and Herbicide Sprays. Phase 2

MAR 86

Authors: David S. Mahler; Zuhair Kharoufa; KLD ASSOCIATES INC HUNTINGTON N Y

The work presented in this report is the result of the second phase of a project to develop a hot-wire based instrument for measuring the volume median diameter contained in insecticide sprays. Prior to the design of such an instrument, calibration curves were obtained for Cythion, Scourge, and Dibrom- 14. These calibration curves match that of mineral oil as determined in Phase I. It was determined that knowing the surface ...

Phosphorobacterin and Its Effectiveness

30 JAN 86

Authors: Ye. N. Mishustin; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH

As a result of works, carried out in institute of agricultural microbiology All-Union Academy of Agricultural Sciences proposed as bacterial fertilizing preparation, phosphorobacterin, which contains culture of spore- forming bacterium Bac. megaterium. This microorganism is capable to destroy organophosphorus compounds and to covert them into the form accessible to plants. Under field conditions phosphorobacterin, i.e. the preparation containing Bac. megaterium, slightly increases the yield of farm crops. According to the ...

A Field Study of Ground Deposition, Wind Drift and Bystander Exposure from Agricultural Aircraft Spray Emissions (Etude sur le Terrain du Depot sur le Sol, de la Porte Eolienne et de la Dose Recue par un Temoin a la Suite d'une Operation d'Epandage Aerien

JUL 85

Authors: R. S. Crabbe; M. McCooeye; NATIONAL AERONAUTICAL ESTABLISHMENT OTTAWA (ONTARIO)

Wind drift, deposition and bystander exposure measurements from agricultural aircraft and ground-rig spray emissions over rural terrain using conventional spray booms and atomizers are presented. A single line was treated. The formulations were aqueous oil emulsions to simulate herbicide applications and aqueous wettable powder emulsions to represent fungicide sprays. Meteorological conditions varied from 'calm' thermally unstable to near-neutral moderately windy (4.9 ms -1 at 4 m above ground). Time-integrated atmospheric ...

Theory of the Propagation of Finite Amplitude Ultrasonic Waves in Pure Mode Directions in Hexagonal and Trigonal Crystals

JUN 85

Authors: G. Du; M. A. Breazeale; TENNESSEE UNIV KNOXVILLE ULTRASONICS LAB

The nonlinear theory describing the propagation of finite amplitude ultrasonic waves in pure mode directions in hexagonal and trigonal crystals is developed. By evaluating the coefficient of the term which couples the longitudinal wave of finite amplitude to the transverse modes, one finds the pure mode directions by requiring this coefficient to vanish. The result is that for hexagonal crystals the directions along the symmetry axis and in the basal ...

Worldwide Report: Epidemiology

19 OCT 1984

Authors: JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA

The report contains information on worldwide epidemiology with particular attention to disease prevention, livestock vaccines and pest control.

USSR Report, Chemistry, No. 96

14 JAN 1983

Authors: JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA

China Report, Agriculture, No. 245

07 JAN 1983

Authors: JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA

The 2, 4-D Threshold Concentrations for Control of Eurasian Watermilfoil and Sago Pondweed

DEC 1982

Authors: Jerry F. Hall; Howard E. Westerdahl; Ronald E. Hoeppel; Lena Williams; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB

The objective of this study was to use a modified diluter system to determine the minimum sustained (threshold) concentrations of 2,4- dichlorophenoxy acetic acid (2,4-D) required to control the growth of Eurasian watermilfoil (Myriophyllum spicatum L.) and Sago pondweed (Potamogeton pectinatus L.). This study was designed to incorporate recommended improvements and to verify results from a previous pilot study. The diluter system delivered five different concentrations of 2,4-D to five ...

The Post-Processing Approach in the Finite Element Method. Part 2. The Calculation of Stress Intensity Factors

DEC 1982

Authors: I. Babuska; A. Miller; MARYLAND UNIV COLLEGE PARK LAB FOR NUMERICAL ANALYSIS

In the context of a model problem the authors describe post- processing techniques for the calculation of generalized stress intensity factors. They discuss two broad classes of methods, one involving an influence function, and the other related to the well-known energy release principle of fracture mechanics. An error analysis is sketched and two numerical examples are given to illustrate the effectivity of the techniques. This is the second in a ...

USSR Report, Agriculture No.1352

01 OCT 1982

Authors: JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA

Compatibility of a Cerscospora rodmanii Formulation with Selected Herbicide Spray Additives

OCT 1982

Authors: Judith C. Pennington; Edwin A. Theriot; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB

Cercospora rodmanii Conway, a fungal pathogen, offers promise as a biocontrol of the aquatic plant water hyacinth (Eichhornia crassipes (Mart.) Solms.). A powered formulation of the pathogen has been developed by Abbott Laboratories, Chicago, Ill. To facilitate the spray application of this formulation, a chemical additive was needed that would not be inhibitory to the fungus. Nine additives commonly used in application of herbicides for control of aquatic plants were ...

East Europe Report, Scientific Affairs, No. 755

28 SEP 1982

Authors: JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA

China Report, Agriculture No. 223

02 SEP 1982

Authors: JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA

Engineering and Development Support of General Decon Technology for the U.S. Army's Installation Restoration Program. Task 11. Composting of Explosives

SEP 1982

Authors: Jenefir D. Isbister; Richard C. Doyle; Judith F. Kitchens; ATLANTIC RESEARCH CORP ALEXANDRIA VA

The primary objective of this study was to determine the extent to which TNT and RDX concentrations are reduced by composting under controlled conditions in the laboratory over a period of six weeks. A second objective was to determine if bench-scale composting studies accurately simulate the activity of a large-scale compost by comparison of parallel studies monitoring TNT and RDX disappearance in laboratory scale (50 g dry weight) and greenhouse ...

Engineering and Development Support of General Decon Technology for the U.S. Army's Installation Restoration Program. Task 2. Composting of Explosives

SEP 82

118 pages

Authors: Jenefir D. Isbister; Richard C. Doyle; Judith F. Kitchens; ATLANTIC RESEARCH CORP ALEXANDRIA VA

The primary objective of this study was to determine the extent to which TNT and RDX concentrations are reduced by composting under controlled conditions in the laboratory over a period of six weeks. A second objective was to determine if bench-scale composting studies accurately simulate the activity of a larger-scale compost by comparison of parallel studies monitoring TNT and RDX disappearance in laboratory scale (50 g dry weight) and greenhouse ...

USSR Report, Agriculture, No. 1340

29 JUL 1982

Authors: JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA

USSR Report, Agriculture, No. 1332

04 JUN 1982

Authors: JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA

PARTIAL CONTENTS: REGIONAL DEVELOPMENT - Party Official Reviews Latvian AgriculturaL PrOgram, USSR Private Plot Basic Role and Future Development Outlined; TILLING AND CROPPING TECHNOLOGY - Zonally Adapted System of Soil Tillage in Kubyshevskaya Oblast, Effectiveness of Applying Compound Fertilizers to Oats in Baskiriya.

Proceedings 16th Annual Meeting, Aquatic Plant Control Research Planning and Operations Review Held at St. Paul, Minnesota on 17-19 November 1981

JUN 1982

Authors: ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

The 16th Annual Meeting of the U.S. Army Corps of Engineers Aquatic Plant Control Research Program was held in St. Paul, Minnesota, on 17-19 November 1981, to review current research activities and to afford an opportunity for presentation of operational needs. (Author)

Nonlinear Representation and Pulse Testing of Communication Subsystems

MAY 1982

Authors: Vijay K. Jain; Aubrey M. Bush; UNIVERSITY OF SOUTH FLORIDA TAMPA DEPT OF ELECTRICAL ENGINEERING

In this report we describe a method for determining the linear and quadratic subsystems from square-pulse tests. The identification method involves two transient test in the laboratory, followed by analysis by the computer. Advantages of the method include the rapidity of the laboratory tests, as contrasted with traditional frequency-scan approaches, and the explicit determination of the transfer functions. Furthermore, the method is also extendible to H3(s1,s2,s3). (Author)

Evaluation of the Infectivity of a Cercospora Rodmanii Formulation Using Two Application Systems

JUN 1981

Authors: Edwin A. Theriot; Russell F. Theriot; Dana R. Sanders Sr; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

As a part of a Large-Scale Operations Management Test (LSOMT) of insects and pathogens for the control of waterhyacinth (Eichhornia crassipes Mort.) in Louisiana, a formulation of Cercospora rodmanii was evaluated to determine the ability of C. rodmanii to infect field populations of waterhyacinth, and to evaluate two equipment systems for suitability in application of the formulation. The formulation was applied with a high-pressure piston pump system at 150 psi ...

Evaluation of a Formulation of Cercospora Rodmanii for Infectivity and Pathogenicity of Waterhyacinth

JUN 1981

Authors: Edwin A. Theriot; Russell F. Theriot; Dana R. Sanders Sr; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

As a part of a Large-Scale Operations Management Test (LSOMT) of insects and pathogens for the control of waterhyacinth in Louisiana, a formulation of the fungal pathogen Cercospora rodmanii was preliminarily evaluated to determine application rates required to achieve adequate infection of water-hyacinth under environmental conditions normally found in Louisiana. In a spring study, a C. rodmanii formulation containing one million viable propagules per gram was applied to test tanks ...

Singular Perturbation Method for Supercavitating Propellers

30 JAN 1981

Authors: Okitsugu Furuya; TETRA TECH INC PASADENA CA

The singular perturbation method for the supercavitating propeller had four scaling parameters; (1) span length R, (2) chord length c, (3) blade spacing d and (4) cavity length 1 sub c. The first problem solved here assumed that c/R and 1 sub c/R were of order epsilon but d/R was of order of unity. The nature of the singular perturbation problem for such a case was similar to that for ...

Guide for Fish Kill Investigations.

09 MAY 1980

Authors: Carl A. Bouwkamp; ARMY ENVIRONMENTAL HYGIENE AGENCY ABERDEEN PROVING GROUND MD

This technical guide was written to serve as an aid in solving fish kills locally by Army installations and give specific guidance on this Agency's role in assisting with fish kill investigations. Possible causes of fish kills, possible preventive measures, and preparing for/conducting fish kill investigations are the major topics discussed. (Author)

Exploration for Natural Enemies of Hydrilla verticillata in Eastern Africa.

MAY 1980

Authors: Robert W. Pemberton; AGRICULTURAL RESEARCH SERVICE GAINESVILLE FL

This survey of East African water habitats was conducted to find natural enemies of Hydrilla verticillata Royle (Hydrocharitaceae). Since 1960, when it was first recorded, hydrilla has spread through the southeastern part of the United States and has the potential to occupy large portions of freshwater bodies. It not only precludes use of an infested waterway by man but can be ecologically disruptive. A two-phase survey was conducted during September-December ...