| Photodeposition in Glasses |
05 JAN 98 |
9 pages |
| Authors:
Harry D. Gafney; QUEENS COLL FLUSHING NY CHEMISTRY DEPT
|
 | Changes in refractive index achieved by photodeposition and their transmissivity depend on the nature of the material deposited, its aggregation and its effect on the host matrix. 254-nm photolysis of (CH3)3SnI chemisorbed onto porous Vycor glass and Si-based sol-gel glasses leads to homolytic cleavage of the Sn-I bond. Depending on medium polarity, a fraction of the radical pairs thermalize via electron transfer and (CH3)3Sn(+), which is converted to SnO2 during ... |
|
| A Symposium on Bioluminescence and Chemiluminescence |
01 JAN 1998 |
7 pages |
| Authors:
J. W. Hastings; HARVARD UNIV CAMBRIDGE MA
|
| This grant provided travel and subsistence for scientists to attend and report research findings at the 9th International Symposium on Bioluminescence and Chemiluminescence, held at the conference facilities of the Marine Biological Laboratory, Woods Hole, MA from October 4 to 8, 1996. There were 256 persons registered and 169 abstracts submitted, all of which were published in the Journal of Bioluminescence and Chemiluminescence. The ... |
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| Nuclear Nonproliferation and Safety; Uncertainties About the Implementation of U. S.-Russian Plutonium Disposition Efforts |
JAN 98 |
39 pages |
| Authors:
GENERAL ACCOUNTING OFFICE WASHINGTON DC RESOURCES COMMUNITY AND ECONOMIC DEVELOPMENT DIV
|
| From World War II to the end of the Cold War, the United States and the former Soviet Union produced large quantities of plutonium to build nuclear weapons. With the lessening of tensions between the United States and Russia, efforts began to reduce the inventory of both countries' excess plutonium. In early 1994, Presidents Clinton and Yeltsin endorsed the goal of nuclear arms reduction and directed experts to begin studying ... |
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| Relating Ocean Optics to Photochemical Transformations of Dissolved Organic Carbon in Coastal Waters |
Jan 1998 |
6 pages |
| Authors:
William L Miller; DALHOUSIE UNIV HALIFAX (NOVA SCOTIA) DEPT OF OCEANOGRAPHY
|
| The long-term goal of this research is to use remotely sensed ocean optical data for estimates of the regional and global scale significance of photochemistry to dissolved organic carbon (DOC) cycles and optical changes resulting from these processes. The central objective of this research program is to examine quantitatively the links between optical measurements and photochemical carbon transformations in the sea. Our goal is to establish quantitative methods to relate ... |
|
| Charge Spreading and Position Sensitivity in a Segmented Planar Germanium Detector (Preprint) |
1998 |
5 pages |
| Authors:
R. A. Kroeger; N. Gehrels; W. N. Johnson; J. D. Kurfess; B. P. Phlips; J. Tueller; NAVAL RESEARCH LAB WASHINGTON DC
|
| The size of the charge cloud collected in a segmented germanium detector is limited by the size of the initial cloud, uniformity of the electric field, and the diffusion of electrons and holes through the detector. These factors affect the minimize size of a practical electrode structure and consequently the position sensitivity. We have completed measurements on a germanium strip detector with a finely collimated gamma ray beam to measure ... |
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| Synthesis and Characterization of Sensitizers for Surface Derivatization of Nanocrystalline Photocatalyst Film Devices |
05 DEC 97 |
9 pages |
| Authors:
Michael Graetzel; ECOLE POLYTECHNIQUE FEDERLE DE LAUSANNE(SWITZERLAND) LAB DE PHOTONIQUE ET INTERFACES
|
| The work performed over the period from Sept. 1996-Oct. 1997 under the original grant no. DAJA 45-90-C-0007 from the European Research Office of the US. Army was in line with the principal objectives of the proposed investigations, i.e. the synthesis of ligands, the complexation of the ligands to appropriate metal ions, the application of the metal complexes to nanocrystalline semiconductor surfaces, the examination of the properties of such films and ... |
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| Nanoparticle Phosphors Manufactured Using the Bicontinuous Cubic Phase Process |
18 NOV 1997 |
16 pages |
| Authors:
Jianping Yang; Henry F. Gray; Banahalli Ratna; David S. Hsu; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| Nanocrystalline phosphors are formed within a bicontinuous cubic phase. Accordingly, it is an object of the present invention to provide phosphors having a high light output level. It is another object of the present invention to provide nanocrystalline phosphors that have no or few bulk defects. These and additional objects of the invention are accomplished by forming doped nanocrystalline semiconductor particles within the mesoporous cavities of a bicontinuous cubic phase. ... |
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| Photochemical and Biological Degradation of Quadracyclane, Dinitramide and Perfluoropolyethers |
06 OCT 97 |
39 pages |
| Authors:
B. P. Sullivan; Daniel A. Buttry; Patricia J. Colberg; WYOMING UNIV LARAMIE DEPT OF CHEMISTRY
|
| This report describes novel results concerning the chemistry and microbiology of quadracyclane (QC) and dinitramide (DN). No results are presented for peffluoropolyethers, since they were found to be intractable, and therefore resistant to degradation under our experimental conditions. |
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| Synthesis and Characterization of Novel Compound Clusters |
26 AUG 97 |
12 pages |
| Authors:
Michael A. Duncan; GEORGIA UNIV RESEARCH FOUNDATION INC ATHENS
|
| Metal-compound microclusters are produced in the gas phase with laser vaporization in a pulsed nozzle cluster source. The clusters which grow are measured with mass spectrometry and their energetics are measured with photoionization and laser photodissociation. The abundant species found and/or the inert species found are evaluated as prospects for the synthesis of macroscopic cluster assembled materials. |
|
| Ultrafast Photochromic Sol-Gel Glasses & Fiber Optic Sensors |
21 AUG 97 |
26 pages |
| Authors:
Eric L. Chronister; CALIFORNIA UNIV RIVERSIDE DEPT OF CHEMISTRY
|
| Organically doped sol-gel glasses have been investigated as fast response photochromic materials and as novel cladding materials for intrinsic fiber-optic chemical sensors. The following investigations are discussed: (1) Time-resolved spectroscopic measurements of fast optical energy transfer and trapping in organically doped glasses as a probe of the spatial distribution of chromophores within porous sol-gel matrices; (2) Picosecond photon echo measurements of homogeneous dephasing have been utilized as a probe of ... |
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| Thermoluminescence Radiation Dosimetry Using Transparent Glass Containing Nanocrystalline Phosphor |
12 AUG 1997 |
|
| Authors:
Brian L. Justus; Alan L. Huston; DEPARTMENT OF THE NAVY WASHINGTON DC
|
 | Radiation is detected using a light transparent thermoluminescent dosimeter that comprises a nanocrystalline phosphor dispersed in a light transparent glassy matrix, such as Vycor glass. The dosimeter is placed in an environment in which radiation is present for a period of time. removed from the environment and then heated to emit light the intensity of which is indicative of the radiation dose. The method of the invention is useful for ... |
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| Trivalent Phosphors for ACTFEL Applications |
09 JUL 1997 |
8 pages |
| Authors:
J. F. Wager; OREGON STATE UNIV CORVALLIS DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The original goal of this ASSERT research program was to extend our alternating-current thin-film electroluminescent (ACTFEL) device physics research in a new direction; namely, exploration of the potential of several classes of phosphor materials (trivalent oxides, nitrides, and oxynitrides) deposited by rf magnetron sputtering for ACTFEL thin-film display applications. This goal was modified to the exploration of certain divalent and trivalent nitrides such as CaSiN2:Eu and AlInN2:Tm for ACTFEL phosphor ... |
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| Solution-and Solid-State Photoelectrochromic Switching in Organized Assemblies |
07 JUL 97 |
14 pages |
| Authors:
Chad A. Mirkin; NORTHWESTERN UNIV EVANSTON IL DEPT OF CHEMISTRY
|
| The goal of the project is to prepare, characterize, and study organized, densely packed, highly oriented monolayer structures of redox and photoactive adsorbate molecules (azobenzenes and ferrocenylazobenzenes) on a variety of conducting substrates. These types of molecular assemblies are relevant to the development of new forms of ultrahigh density optical data storage media, chemical sensors, optical switches, and photon counters. An understanding of the chemical and physical processes that can ... |
|
| A Novel Photochemical Interfacial Approach to the Degradation of Hazardous Materials |
01 JUL 97 |
5 pages |
| Authors:
Nicholas J. Turro; COLUMBIA UNIV NEW YORK DEPT OF CHEMISTRY
|
| Two studies are described. The first involved the use of time resolved electron spin resonance as a mechanistic and spectroscopic probe of two fundamental reactions of ketone photochemistry: intermolecular hydrogen abstraction by the triplet state of benzophenone and triplet state alpha- cleavage of 1,3-diphenylacetone (dibenzyl ketone). It was found that the forces restricting the ground state conformations of these ketones also restrict the triplet state conformations. The second study used ... |
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| New Approaches to the Labeling of Estrogen Useful for PET |
JUL 1997 |
26 pages |
| Authors:
Michael J. Welch; Stephanie D. Johnson; WASHINGTON UNIV ST LOUIS MO
|
| Positron Emission Tomography (PET) allows estrogen receptor-positive breast cancer to be diagnostically imaged using radiolabeled estrogens with the benefit of early detection, monitoring, and staging of breast cancer. In order to better target breast cancer, improved estrogen receptor imaging agents are sought. Three new estrogen receptor ligands were synthesized with a methoxy substituted at the 16 position. These compounds were obtained by utilizing the chemistry of methyl hypofluorite (MeOF). Conditions ... |
|
| Kinetics and Spectroscopy of BrNO |
JUN 97 |
333 pages |
| Authors:
Patrick E. Godrey; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The infrared spectra and photochemistry of nitrosyl bromide, BrNO, are important to characterizing the performance of a recently demonstrated Br((2)P1/2)-NO(v=2--> v=1) transfer laser pumped by photolysis of iodine molecules. This wavelength agile, mid-infrared laser may be a desirable source for remote sensing and infrared countermeasures missions. Nitrosyl bromide also plays a role in the destruction of stratospheric ozone. The kinetics of BrNO formation and destruction were examined using time- resolved ... |
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| Sensitive, Specific Complementary - Strand Optical Detection of Viral RNA |
JUN 1997 |
33 pages |
| Authors:
Ronald J. Rieder; VISIDYNE INC BURLINGTON MA
|
| The feasibility of a novel low-cost sequence-specific nucleic acid detector of great speed and dynamic range has been examined and each system component has been tested to confidence. This detector records binding events at the surface of optical wave-guides, through coupling to the evanescent wave. The detector is made possible through innovative phase measurement techniques practiced by Visidyne. The laboratory design exceeds current detection noise threshholds and holds great promise ... |
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| Alternative Gate Designs for Improved Radiation Hardness in Bulk CMOS integrated Circuits |
MAR 97 |
248 pages |
| Authors:
Sidney S. Noe; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| In the last 30 years, the world has become increasingly dependent on space-based systems. These systems require varying degrees of radiation tolerance to perform their missions. Current radiation hardening processes for integrated circuits are expensive and consume significant layout area, increase power consumption, and decrease the frequency of operation. Furthermore, it is becoming more difficult to find fabricators for radiation-hardened electronic devices. In this thesis, two new transistor designs using ... |
|
| Chemiluminescent Substrates for Acetylcholinesterease and Alkaline Phosphatase |
28 FEB 97 |
28 pages |
| Authors:
A. P. Schaap; WAYNE STATE UNIV DETROIT MI DEPT OF CHEMISTRY
|
| The primary objective of this research was to develop thermally stable dioxetanes which could be chemically and enzymatically triggered to provide efficient chemiluminescence in aqueous solution. |
|
| 4TH International Conference, Solar Energy Storage and Applied Photochemistry, Cairo, Egypt, 1-6 January 1997. Book of Abstracts |
97 |
182 pages |
| Authors:
M. S. Abdel-Mottaleb; AIN SHAMS UNIV CAIRO (EGYPT) FACULTY OF SCIENCE
|
| The research reported ranged from studies of fundamental processes in light-induced electron-transfer and energy-transfer reactions in homogeneous and heterogeneous media to the different practical use of photochemistry for the synthesis of chemicals, waste water treatments and degradation of industrial effluents that polluted global as well as local environment, atmospheric photochemistry, the treatment of tumors by lasers, solar fuel generation and many other important applications. The systems under investigation includes those ... |
|
| Ordered Piezoelectric Networks via a Liquid-Crystalline Monomer Strategy: Synthesis of the LC Monomer |
12 DEC 96 |
7 pages |
| Authors:
B. C. Baxter; D. L. Gin; CALIFORNIA UNIV BERKELEY DEPT OF CHEMISTRY
|
| Piezoelectric materials are used in many technological applications. The physical requirements for piezoelectricity are a high degree of bulk order and a noncentrosymmetric bulk structure. Conventional single crystal piezoceramics possess a high degree of order and long term stability; however, they are brittle and difficult to fabricate. Poled piezoelectric polymers offer ease of fabrication and processing; however, they lack long term thermal and mechanical stability. A new technique is described ... |
|
| Photochemistry of Fe2(CO)8(mu-CH2) |
DEC 96 |
73 pages |
| Authors:
Daniel M. Branan; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| We herein present the previously unreported photochemistry of two forms of the dimetallocyclopropane complex Fe2(CO)8(mu-CH2), and its deuterated analog. We have determined that it behaves similarly to other dimetallic carbonyls in that it eliminates carbon monoxide upon irradiation with high- intensity UV/visible light to form distinct single and double CO-loss products. Upon formation of a 34-electron single CO-loss product, however, it exhibits the ability to either maintain an unbalanced 16/18-electron ... |
|
| Radiation Hardening of Pure Silica Core Optical Fibers and Their Method of Making by Ultra-High-Dose Gamma Ray Pre-Irradiation. |
12 NOV 1996 |
|
| Authors:
David L. Griscom; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A process for radiation hardening a pure-silica-core fiber, the process comprising the steps of: (a) providing a pure-silica-core fiber having a core index of refraction and having an outer surface; (b) exposing the fiber to a dose of ionizing radiation sufficient to permanently reduce transmission losses of the fiber to no more than about 30 dB/km within a wavelength range of about 400 nm to about 700 nm. In addition, ... |
|
| A Supramolecular Approach to the Mechanisims of Photomineralization of Hazardous Materials |
NOV 96 |
5 pages |
| Authors:
Nicholas J. Turro; COLUMBIA UNIV NEW YORK DEPT OF CHEMISTRY
|
| Supramolecular photochemistry provides experimental tools and mechanistic concepts pertinent to the examination of the fate of Air Force chemicals and how they may be photochemically transformed into environmentally benign substances. This benefication process of converting AF chemicals to environmentally benign materials is termed mineralization. A 'biomimetic' strategy is adopted for which the laboratory model of benefication is based on processes occurring in nature. This biomimetic model provided us with the ... |
|
| Preparation and Investigation of Phosphors for Emissive Displays |
NOV 96 |
61 pages |
| Authors:
Aron Vecht; D. W. Smith; C. S. Gibbons; D. C. Charlesworth; GREENWICH UNIV LONDON (UNITED KINGDOM)
|
| By the use of careful phosphor engineering, new synthetic processes and optimised coating techniques, a range of improved and novel phosphor systems have been developed. These phosphors were designed for cathode ray application, more particularly for low voltage FED use. Improvements include the reduction in particle size to an average of 3 to 1 micrometers for higher resolution, a new saturated blue low voltage system based on bismuth activated yttrium ... |
|
| Crystalline Colloidal Array Optical Switching Devices |
13 SEP 96 |
7 pages |
| Authors:
S. A. Asher; G. Pan; PITTSBURGH UNIV PA DEPT OF CHEMISTRY
|
| We have constructed nonlinear crystalline colloidal arrays from self assembling fluorinated colloidal particles which contain dyes. These colloidal arrays were refractive index matched to the medium such that they do not diffract light. We have observed for the first time the theoretically predicted nonlinear diffraction switching when a pump laser beam is incident at a wavelength absorbed by the dye. The colloidal particle array heats up. The refractive index diverges ... |
|
| Repetitive-Selection Synthesis of Surface Bound Metal Binding Proteins |
11 SEP 96 |
7 pages |
| Authors:
Tomikazu Sasaki; UNIV OF WASHINGTON SEATTLE DEPT OF CHEMISTRY
|
| A silica surface is reacted with a tridentate siloxane to introduce appropriately spaced tris-aminoalkyl (aryl) groups as a template for protein assembly. The modified surface was reacted with simple aldehyde-modified amino acid derivatives. Only bipyridine-containing aldehyde was reacted with the surface in the presence of Fe(II) ion whereas no selective binding was observed in the absence of metal ions. The selection experiments with these simple aldehyde-modified amino acid derivatives demonstrate ... |
|
| Non-Invasive, Photochromic-Tracer Studies of Particulate Suspensions and Granular Media |
01 SEP 96 |
7 pages |
| Authors:
J. D. Goddard; CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF APPLIED MECHANICS AND ENGINEERING SCIENCES
|
| This is a summary of research performed under the subject AFOSR grant on the micromechanics, continuum mechanics and transport properties of granular media and geomaterials. It has involved the development of new theoretical models of microstructure, numerical simulation of granular assemblages, and experimental observation on model systems. The overall goal of the work is to provide a sound microstructural basis for understanding continuum behavior and elucidating structurally and geologically important ... |
|
| SiC for High Power Electro-Optic Switching Application |
SEP 96 |
67 pages |
| Authors:
Michael G. Spencer; Senpeng Sheng; HOWARD UNIV WASHINGTON DC SCHOOL OF ENGINEERING
|
| Photoconductive semiconductor switches have unique advantages such as high power, speed, negligible time jitter and long lifetime. Silicon carbide (SiC), due to its high dielectric strength and other desired properties, is an excellent material for photoconductive switches. However, no appreciable result has been reported on cubic silicon carbide (3C-SiC) photoconductive switches. In this research, photoconductive switches were fabricated on the following three types of 3C-SiC substrates: (i) boron doped, (ii) ... |
|
| Energy and State Resolved Studies of the Pathways of Molecular Decomposition |
21 AUG 96 |
20 pages |
| Authors:
F. F. Crim; WISCONSIN UNIV-MADISON DEPT OF CHEMISTRY
|
| The report describes studies of molecular decomposition using molecular beam photodissociation with vacuum ultraviolet photoionization detection of products. Information on the energy release and decomposition pathways of nitromethane, nitrobenzene, and organometallic molecules come from these studies. |
|
| Photothermal Investigations of GaAs-Based Materials and Quantum-Well Structures |
02 AUG 96 |
22 pages |
| Authors:
R. Gupta; R. Vyas; S. Ang; W. D. Brown; ARKANSAS UNIV FAYETTEVILLE
|
| Photothermal deflection spectroscopy has been applied to GaAs samples with the ultimate goal of measuring the optoelectronic and thermal transport properties of GaAs based multiple quantum wells by this technique. Theoretical models have been developed as well as experimental investigations have been carried out. Both pulsed as well as cw (modulated) excitations have been considered. |
|
| Photofragmentation Studies of an Energetic Materials Sensor Based on a Laser Photofragmentation/Fragment Detection Approach |
AUG 96 |
9 pages |
| Authors:
J. B. Simeonsson; R. C. Sausa; IOWA UNIV IOWA CITY DEPT OF CHEMISTRY
|
| The goals of this research project were to: (1) perform spectroscopic studies of the key fragment species NO and NO2 and identify suitable wavelength schemes for photofragmentation (PF) and fragment detection (FD) by a laser induced fluorescence (LIF) approach; and (2) perform a survey of the pertinent literature to identify instrumental features that are desirable for PF/LIF sensors. |
|
| New Approaches to the Labeling of Estrogens Useful for PET |
JUL 96 |
17 pages |
| Authors:
Stephanie D. Jonson; Michael J. Welch; WASHINGTON UNIV ST LOUIS MO
|
| Estrogen receptor positive breast tumors are evaluated by positron emission tomography (PET) utilizing radiolabeled estrogen ligands. This imaging technique is used to predict the tumor's response to therapy and to follow the progress of disease. Desiring to find new estrogens with high binding affinity for the estrogen receptor, we synthesized 16 alpha-methoxy estradiol. This compound previously had not been isolated nor its binding affinity measured. Characterization has been achieved by ... |
|
| Design of Imaging Materials for use with Photogenerated Base. Radiation Induced Beta-Elimination to Yield Poly(4-Hydroxystyrene) |
30 JUN 96 |
4 pages |
| Authors:
Jean M. Frechet; Edward J. Urankar; Isabella Brehm; Q. J. Niu; Kenneth J. Wynne; CORNELL UNIV ITHACA NY BAKER LAB
|
| The search for chemically amplified resist and imaging materials that are resistant to airborne contaminants has led us to explore new routes to resist imaging. The use of photogenerated base is particularly attractive since several stable photoprecursors of amines and other bases have been developed. We have now designed a novel family of polymers that undergo base catalyzed Beta- elimination to afford poly(p-hydroxystyrene). Although the active units of the polymers ... |
|
| Photogenerated Base in Polymer Imaging and Curing: Novel Imaging Material Based on an Amine-Catalyzed Isomerization Process |
30 JUN 96 |
4 pages |
| Authors:
Q. J. Niu; Edward J. Urankar; Jean M. Frechet; CORNELL UNIV ITHACA NY DEPT OF CHEMISTRY
|
| The use of base photogenerated in situ within a polymer coating affords attractive possibilities for the imaging or curing or reactive polymeric materials. In the case of resists. photogenerated base may provide access to materials that are more resistant to airborne contaminants than the chemically amplified resists currently available commercially today. We have designed a family of novel copolymers containing benzisoxazole pendant groups that rearrange to cyanophenols in the presence ... |
|
| 11TH IUPAC/FECS International Conference on Polymers: Thermal and Photo- Induced Oxidation of Polymers and Its Inhibition in the Upcoming 21st Century. (Abstracts) |
JUN 96 |
147 pages |
| Authors:
SLOVAK ACADEMY OF SCIENCES BRATISLAVA (CZECHOSLOVAKIA)
|
| The conference was held in the Hotel Academia, Stara' Lesna', High Tatras, on June 24-28, 1996. The Conference is organized by Polymer Institute of the Slovak Academy of Sciences, Bratislava. This Proceedings cover the abstracts of contributions arranged as Main Lectures (ML), Contributed Lectures (CL) and Posters (P) on the thermal and photo induced oxidation of polymers and its inhibition in the upcoming 21st century. |
|
| Design, Synthesis and Characterization of Novel Nonlinear Optical Polymers |
31 MAY 96 |
27 pages |
| Authors:
Sukant Tripathy; MASSACHUSETTS UNIV LOWELL DEPT OF CHEMISTRY
|
| The principal focus of the project is to research and develop new polymeric materials based on molecular level design and solid state chemistry. The goals have been to develop electroactive polymers with novel electronic, optical and nonlinear optical properties. |
|
| Crystal Structure, Reactivity, and Photochemical Properties of Tungsten(0) Zwitterionic Amido Complex (CO)5 WNPhNPhC(OMe)Ph |
MAY 96 |
32 pages |
| Authors:
Scott T. Massey; Nicholas D. Barnett; Khalil A. Abboud; Lisa McElwee-White; FLORIDA UNIV GAINESVILLE DEPT OF CHEMISTRY
|
| The crystal structure of the zwitterionic complex (CO)5WNPhNPhC(Ph) OMe (1) shows that it is best described as an amido complex in which the 'imidate' fragment PhN=C(Ph)OMe serves as a substituent on the amide nitrogen. The structural information allows the previously reported conversion of 1 to an isomeric zwitterion to be assigned as simple rotation about the N-C double bond. The twisted intermediate for such a rotation also offers a pathway ... |
|
| Investigation of Chemical Fate of Hazardous Aerospace Materials in Environment: A Supramolecular Photochemical Investigation of Materials Absorbed on Metal Oxides and Porous Solids |
19 APR 96 |
5 pages |
| Authors:
Nicholas J. Turro; COLUMBIA UNIV NEW YORK DEPT OF CHEMISTRY
|
| Supramolecular photochemistry provides experimental tools and mechanistic concepts pertinent to the examination of the fate of Air Force chemicals and how they may be photochemically transformed into environmentally benign substances. This benefication process of converting AF chemicals to environmentally benign materials is termed mineralization. A 'biomemetic' strategy is adopted for which the laboratory model of benefication is based on processes occurring in nature. This biomimetic model provided us with the ... |
|
| Progress in the Production of Samples of Gamma Ray Laser Candidate Materials |
15 APR 96 |
19 pages |
| Authors:
Carl B. Collins; GENERAL COHERENT TECHNOLOGY INC RICHARDSON TX
|
| Studies of the 29 possible candidates to use as the working medium of a gamma ray laser have identified the 31-year isomer of Hafnium-178 as the best. This research was aimed at the development of a production cycle for this rare substance. A major success of this work was the discovery in byproduct debris from the synthesis of medical isotopes of a quantity of this material equal to 99% of ... |
|
| Design of Metal-Detecting Antibodies |
09 APR 96 |
7 pages |
| Authors:
Elizabeth D. Getzoff; Victoria A. Roberts; SCRIPPS RESEARCH INST LA JOLLA CA
|
| We have designed metal ion biosensors through the template-based incorporation of metal-binding sites into an antibody scaffold. We constructed a high-resolution three-dimensional model of the variable domain of the catalytic antibody NPN43C9 based on our antibody structural database. By transplanting metal-binding templates from metelloenzymes into the antibody structural model, we identified potential metal-binding sites within the antigen-binding pocket, where bound metal could be detected by spectral changes of the antibody ... |
|
| High Temperature Nonlinear Optical Chromophores and Polymers |
31 MAR 96 |
65 pages |
| Authors:
Robert D. Miller; IBM ALMADEN RESEARCH CENTER SAN JOSE CA
|
| We have developed a thermal protocol for the evaluation of NLO chromophores for very high temperature electro-optical applications with poled polymers. This protocol has been demonstrated to have significant predictive utility for EO applications. We have demonstrated that while chromophore thermal instability and nonlinearity are linked, this relationship is not inviolable. Certain thermally stable NLO chromophores have been incorporated into polyimide derivatives either by flexible tether connections or by direct ... |
|
| Optically-Inscribed High Efficiency Diffraction Gratings in Azo Polymer Films |
28 MAR 96 |
3 pages |
| Authors:
C. Barrett; A. Natansohn; P. Rochon; QUEEN'S UNIV KINGSTON (ONTARIO) DEPT OF CHEMISTRY
|
| A series of amorphous azobenzene-containing polymers were cast as thin films and shown to produce both reversible volume diffraction gratings and high-efficiency surface gratings by laser irradiation at an absorbing wavelength. The latter process involves localized mass transport of the polymer chains to a high degree, as atomic force microscopy reveals surface profile depths near that of the original film thickness. A mechanism for this phenomenon is proposed which involves ... |
|
| Air Treatment Project: Final Summary Report and Bibliography |
15 MAR 1996 |
57 pages |
| Authors:
J. M. Schneider; PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
|
| This Summary Report describes the results of more than two years of research conducted with funding provided by SERDP, the Marine Corps Logistic Bases (MCLB) and the Navy Department's LINC (Repair Technology) Program. The research focused on the destruction of VOCs in paint booth exhaust using hybrid air pollution control technologies. The hybrid system selected included three principle modules: UV photochemical destruction; counter-flow packed bed scrubbing using activated oxygen; and ... |
|
| A.C. Light Emitting Devices Based on Conjugated Polymers |
01 MAR 96 |
15 pages |
| Authors:
Y. Z. Wang; D. D. Geblet; L. B. Lin; J. W. Blatchford; S. W. Jessen; OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS
|
| Most polymer electrolumininescent devices to date are represented as tunnel diodes and operate under DC driving field. Here we report the fabrication of symmetrically configured AC light emitting (SCALE) devices based on conjugated polymers. The new devices consist of an emissive polymer layer sandwiched between two redox polymer layers. This configuration enables the SCALE devices to work under both forward and reverse DC bias as well as in AC modes. ... |
|
| Photodissociation Studies of Sulfur Oxides |
01 MAR 96 |
21 pages |
| Authors:
Brad R. Weiner; PUERTO RICO UNIV RIO PIEDRAS DEPT OF CHEMISTRY
|
| The detailed reaction dynamics of several gas phase polyatomic systems has been established in this research at the Department of Chemistry at the University of Puerto Rico. Real time dynamics of sulfur monoxide photoelimination reactions have been studied by laser induced fluorescence spectroscopy of the nascent SO fragment on the B(3)sigma (-) - X(3)sigma(-) transition in the region of 237-310 nm. The following group of molecules has been studied: Sulfur ... |
|
| Photofragmentation Spectroscopy and Photodissociation Dynamics of Polyatomic Molecules |
01 MAR 96 |
23 pages |
| Authors:
Brad R. Weiner; PUERTO RICO UNIV RIO PIEDRAS DEPT OF CHEMISTRY
|
| The detailed reaction dynamics of several gas phase polyatomic systems has been established in this research at the Department of Chemistry at the University of Puerto Rico. Real time dynamics of sulfur monoxide photoelimination reactions have been studied by laser induced fluorescence spectroscopy of the nascent SO fragment on the B(3) sigma(-) - X(3) sigma(-) transition in the region of 237-310 nm. The following group of molecules has been studied: ... |
|
| Laser-Induced Photofragmentation/Fragment Detection Spectrometry of Brominated Compounds |
MAR 96 |
38 pages |
| Authors:
R. C. Sausa; J. B. Simeonsson; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Studies have been performed to evaluate the analytical capabilities Of a novel, one-color, laser-induced photoframentation/fragment detection technique for the detection of ambient brominated compounds. Laser radiation at 260.634 nm is used to both fragment the brominated compounds and excite the characteristic Br atom photofragment via its two-photon 4p(4)5p(4)D(sup o) 3/2 left arrow 4p(5) (2)p(sup o) 3/2 transition. Detecton is accomplished by either (2+1) resonance-enhanced multiphoton ionization (REMPI), or by laser-induced ... |
|
| Polyphosphazene Membranes. I. Solid-State Photocrosslinking of Poly(4- Ethylphenoxy)(Phenoxy)Phosphazene |
15 FEB 96 |
39 pages |
| Authors:
Ryszard Wycisk; Peter N. Pintauro; Wei Wang; Sally O'Connor; TULANE UNIV NEW ORLEANS LA
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| Dense films of poly((4-ethylphenoxy)(phenoxy)phosphazene), PEPP, a potentially attractive ion-exchange membrane material, were crosslinked to varying degrees using UV light and a photoinitiator. This polymer contained two kinds of substituents: phenoxy groups to be used for possible functionalization (e.g. , sulfonation) and ethylphenoxy sidechains for photocrosslinking, where hydrogens at the benzylic carbons could be abstracted by a photoinitiator leaving macroradicals that after recombination formed covalent bonds. The polyphosphazene polymer was synthesized, ... |
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| Demonstration and Evaluation of the Air Force Site Characterization and Analysis Penetrometer System in Support of Natural Attenuation Initiatives. Volume 4 - Demonstration, Testing, and Evaluation at Dover AFB |
09 FEB 96 |
94 pages |
| Authors:
Martin L. Gildea; Wesley L. Bratton; James D. Shinn Ii; APPLIED RESEARCH ASSOCIATES INC SOUTH ROYALTON VT NEW ENGLAND DIV
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| A second-generation tunable Laser-Induced Fluorescence-Cone Penetrometer Test (LIF-CPT) system has been developed and demonstrated at three different Air Force Bases as an alternative site characterization technology. This represents an innovative technology for delineating soil contamination resulting from fuel spills. Applied Research Associates, Inc. and Dakota Technologies, Inc. jointly conducted the system development and demonstration project. Demonstrations consisted of 2-week efforts at each of Air Force Bases: Plattsburgh Patrick/Cape Canaveral, and ... |
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Radiation and Nuclear Chemistry
