Cosmic-ray hydrogen and helium nuclei during a solar quiet time in july 1961.
Energy spectra of cosmic ray hydrogen and helium nuclei determined from nuclear emulsions flown in high altitude balloon
COSMIC RADIATION↗
SEARCH · Engineering Papers
Results for “Emulsions”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
A search for gamma-ray point sources.
Gamma ray point sources search using oriented nuclear emulsions flown on high altitude balloons
GAMMA RADIATION↗
Study and evaluation of electronography Final report
Photographic and electron photographic emulsion efficiencies calculated as function of density
ELECTRON PHOTOGRAPHY↗
Observation of the elemental abundances in low-energy cosmic rays in July 1964
Nuclear emulsion detectors for observing elemental abundances in low energy cosmic rays
ELEMENT ABUNDANCE↗
Report issued on Gemini 8 experiments
Gemini 8 experiments - bioassays of spacecrew blood and urine samples, frog egg growth, and nuclear emulsion experiment
GEMINI SPACECRAFT↗
An Apparently High Flux of Primary Cosmic-ray Gamma-particles at 41 Deg N. Mag.
Primary cosmic ray alpha particle flux measured in nuclear photographic emulsions during high altitude balloon flight
PRIMARY COSMIC RADIATION↗
Behavior of some photographic materials exposed to radiation in the 8-Angstrom region.
Behavior of high speed panchromatic emulsions and films sensitive to X-ray and far UV radiation exposed in spectral region 8-10 angstroms
PHOTOGRAPHIC EMULSION↗
1961-1964 balloon observations of cosmic rays.
Low energy galactic cosmic radiation studies by high altitude balloon flights carrying nuclear emulsions, including solar activity, energy and intensity spectra, etc
GALACTIC RADIATION↗
Solar cosmic ray heavy nuclei and the 18th July 1961 event.
Balloon-borne nuclear emulsion detection of solar cosmic ray heavy nuclei during solar burst
HEAVY COSMIC RAY PRIMARY↗
An experimental examination of low energy cosmic ray heavy nuclei.
Balloon-borne nuclear emulsion detection of finite fluxes of low energy cosmic ray heavy nuclei and interstellar cosmic radiation propagation
INTERSTELLAR RADIATION↗
The use of delta electrons to determine the nature and energy of charged particles
Delta electrons in nuclear emulsions used in determining nature and energy of cosmic ray particles
COSMIC RAY↗
The energy spectrum of cosmic-ray heavy nuclei of charge Z greater than 10 during a solar quiet time in July 1961.
Energy spectrum of cosmic ray heavy nuclei, using stack of nuclear emulsions exposed during Quiet Sun on balloon flight
NUCLEAR EMULSION↗
Energy spectrum and geomagnetic cut-off of primary cosmic-ray alpha-particles near 41 deg N mag.
Energy spectrum of primary cosmic ray alpha particles measured by nuclear photographic emulsion, estimating geomagnetic cut-off energies
ENERGY SPECTRUM↗
Encapsulation of Wastes Using Adapted Geopolymer Formulations - 20272
A geopolymer formulation characterized by a low initial viscosity, suitable to immobilise a wide range of waste types such as oils, chemicals and solid waste, is introduced and characterized. The role of the specific surface area of magnesium oxide additions to the reference formulation is presented. Moreover, its capability to encapsulate different volume fractions of oil via the preparation of oil in activator solution emulsions is introduced. Lastly, the effect of oil incorporation on the density, the mechanical strength and the leaching properties of the compositions is presented and discussed. (authors)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
Nanoparticle/Polyelectrolyte Complexes for Biomimetic Constructs
Abstract Constructing all‐aqueous systems with tailored geometries can generate a new class of biomimetic materials, a fascinating but challenging goal to achieve. Here, by taking advantage of the interfacial complexation of a polyelectrolyte (PE) and cellulose nanocrystals (CNCs), a unique interfacial PE/CNC complex is demonstrated for the stabilization of aqueous two‐phase systems and for the fabrication of all‐aqueous double emulsions and 3D constructs. The thickness of PE/CNC complex can be effectively adjusted by tuning the osmotic stress imbalance between the two aqueous phases and, during the formation and thickening of PE/CNC complex, individual assemblies can be connected to design hierarchical all‐aqueous structures. This new platform affords tremendous potential for engineering biomimetic constructs with advanced functionality, that can be used for chemical separation, delivery, and biphasic cascading reaction vessels.
Yin, Yixuan↗
Aggregation‐Induced Stimulated Emission of 100% Dye Microspheres
Dyes with aggregation-induced emission (AIE) properties have gained interest due to their bright luminescence in solid-state aggregates. While fluorescence from AIE dyes is widely exploited, relatively little is known about aggregation-induced stimulated emission. Here, stimulated emission of tetraphenylethene (TPE)-based organoboron AIE dyes, TPEQBN, in thin films and in microcavity lasers is investigated. Using femtosecond pump–probe spectroscopy, gain coefficients up to 230 cm -1 at 500 nm are measured. Using rate equations, concentration- and pump-dependent gain dynamics as well as laser build-up dynamics are analyzed. During laser oscillation, radiative stimulated emission allows high instantaneous quantum yield greater than 90% to be achieved. Solid-state microspheres made of 100% AIE dyes are fabricated via microfluidic emulsion and solvent evaporation method. Coupled with high gain and high refractive index of 1.76, microspheres as small as 2 µm in diameter show lasing by nanosecond pumping with a threshold of ≈10 pJ µm –2 . Polymer coated, but not bare, microspheres are internalized by live cells and generate narrowband cavity-mode emission from within the cytoplasm. This work shows the potential of AIE dyes as laser materials.
36 MATERIALS SCIENCE↗
Swelling-Induced Symmetry Breaking: A Versatile Approach to the Scalable Production of Colloidal Particles with a Janus Structure
Janus particles are widely sought for applications related to colloidal assembly, stabilization of emulsions, and development of active colloids, among others. Here we report a versatile route to the fabrication of well-controlled Janus particles by simply breaking the symmetry of spherical particles with swelling. When a polystyrene (PS) sphere covered by a rigid shell made of silica or polydopamine is exposed to a good solvent for PS, a gradually increased pressure will be created inside the shell. If the pressure becomes high enough to poke a hole in the shell, the spherical symmetry will break while pushing out the swollen PS through the opening to generate a Janus particle comprised of two distinct components. One of the components is made of PS and its size is controlled by the extent of swelling. The other component is comprised of the rigid shell and remaining PS, with its overall diameter determined by the original PS sphere and the rigid shell. This solution-based route holds promises for the scalable production of complex Janus particles with a variety of compositions and in large quantities.
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
Phase Behavior of Charged Star Block Copolymers at Fluids Interface
The phase behavior of block copolymers (BCPs) at the water-oil interface is influenced by the segmental interaction parameter (χ) and chain architecture. We synthesized a series of star block copolymers (s-BCPs) having polystyrene (PS) as core and poly(2-vinylpyridine) (P2VP) as corona. The interaction parameters of block-block (χ PS-P2VP ) and block-solvent (χ P2VP-solvent ) were varied by adjusting the pH of the aqueous solution. Lowering pH increased the fraction of quaternized-P2VP (Q-P2VP) with enhanced hydrophilicity. By transferring the equilibrated interfacial assemblies, morphologies ranging from bicontinuous films at pH of 7 and 3.1 to nanoporous and nanotubular structure at pH of 0.65 were observed. The nanoporous films formed hexagonally packed pores in s-BCP matrix, while nanotubes comprised Q-P2VP as corona and PS as core. Control over pore size, d-spacing between pores, and nanotube diameters was achieved by varying polymer concentration, molecular weight, volume fraction and arm number of s-BCPs. Large-scale nanoporous films were obtained by freeze-drying emulsions. Remarkably, the morphologies of linear BCPs were inverted, forming hexagonal-packed rigid spherical micelles with Q-P2VP as core and PS as corona in multilayer. Here, this work provides insights of phase behaviors of BCP at fluids interface and offer a facile approach to prepare nanoporous film with well-controlled pore structure.
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗