Nanophase Technologies (United States)

The NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) is home to major NASA satellite precipitation measurement missions including the Tropical Rainfall Measuring Mission (TRMM) and the Global Precipitation Measurement (GPM) as well as other NASA projects. Accurate and timely available global and regional precipitation products play an important role in research and applications around the world. The GES DISC provides near-real-time, near-global precipitation products (e.g.IMERG) to support a wide variety of interdisciplinary research and operational activities including flood modeling, landslides, crop monitoring and assessment, vector-borne diseases, etc. Climate data record products (e.g.GPCP3) are essential for climate research, assessment, model evaluation and applications. To facilitate data access and exploration, the GES DISC has developed data services such asGiovanni, an online visualization and analysis tool for easy access to over 2000 satellite- and model-based variables. Established in the mid 1980s, the GES DISC also distributes data in other disciplines including hydrology, atmospheric chemistry, atmospheric dynamics, etc. In this presentation, we will present an update on global precipitation products and data services including the new IMERG V06B suite, the latest version of GPCP (Version 3) and value-added data subsetting services (L34RS, L2S).

Nature has achieved diverse functionality via hierarchical organization driven by physical interactions such as hydrogen bonding. Synthetically, polymer-peptide hybrids have been utilized to achieve these architectural arrangements and obtain diverse mechanical properties, stimuli responsiveness, and bioactivity. Here, we explore the impact of peptide ordering and soft/hard phase interactions in PEG-based non-chain extended and chain extended peptidic polyurea (PU) and polyurea/polyurethane (PUU) hybrids towards tunable mechanics. Increasing the peptide content of poly(ε-carbobenzyloxy-l-lysine) (PZLY) revealed an increase in α-helical formation and modulation in amine/ether hydrogen bonding, suggesting enhanced intermolecular hydrogen bonding between peptide segments and soft/hard blocks. A balance of phase mixing and microphase segregation was observed depending on competitive hydrogen bonding and the hybrid architecture. This phase behaviour strongly modulated the mechanical response, particularly modulus and extensibility. We anticipate that this solid-state, synthetic framework will expand the reach of our peptide hybrids into biointerfacing materials, including scaffolds and responsive actuators via peptide selection.

Visualization investigation the oxygen bubble evolution and dynamics reveals the real phenomena inside an operating proton exchange membrane electrolyzer cell.

Traditional photolithography begins with single-photon absorption of patterned light by a photo-initiator to locally expose a resist. In two-color photo-initiation/inhibition (2PII) lithography, these exposed regions are confined by a surrounding pattern of inhibitors generated by one-photon absorption of a second color in a photo-inhibitor. Like a stencil used to confine spray-paint to a thin, sharp line, the inhibitory pattern acts as a remotely programmable, transient near-field mask to control the size and shape of the modified resist region. The inhibiting species rapidly recombine in the dark, allowing for fast sequential exposures and thus enabling fabrication of complex two- or threedimensional structures.

Monocular architecture is an attractive candidate for a consumer drive. A raw data density of 712Gbits/inch 2 was achieved using this architecture with a blue laser and a high NA objective lens.

Nano-sized particles with well defined geometries and size distributions suitable for polishing glass and glass ceramics are readily available. Understanding how effective these particles are at removing material and smoothening surfaces during pitch polishing processes is essential for process optimization and achieving better surfaces. This paper details work conducted to measure how effective sub-micron sized particles are at polishing and to isolate the influence of process chemistry and slurry density on the material removal rate (MRR). The paper also details how modifying the slurry pH affects the polishing coefficient of friction (CoF). Fused silica was polished on a synthetic pitch polishing tool with a range of different polishing slurries. Slurries tested included 40nm diameter ceria based slurries with varying density and pH, and both 20nm and 750nm diameter ceria based slurries with fixed density and pH values. Findings include that a) the material removal rate decreases with particle size and decreasing slurry density, b) the surface finish is not strongly dependent on particle size, c) slurries with a pH of 7 are most effective in removing material, while slurries with a pH value of 4 have the lowest MRR, and finally that d) the polishing CoF is greatest at pH 4 and lowest at pH 10. The results indicate that while process chemistry is very influential when polishing with submicron sized particles, the actual nature of the interaction between the abrasive, the workpiece and the tool requires further investigation.

What is believed to be a novel holographic design for read-only memory systems allows a compact low-cost consumer drive within a 10 mm drive height, using a lensless phase conjugate readout and a combination of polytopic and angle multiplexing. A two-step mastering method enables production of high-efficiency holographic masters, and fast replication is possible by using only a series of plane-wave illuminations. Mastering and replication techniques are verified experimentally with an array of 125 holograms with no measured bit errors.

An overview of the InPhase Technologies holographic demonstration platform is presented. This compact, mobile system is a fully functional holographic recordable drive complete with custom optics and custom control and channel electronics. The development of this device paves the way for the commercialization of this technology.