gebhart/patrepeval huggingface dataset:
Laboratory-scale hybrid rocket motor uncertainty analysis (1996)

Laboratory-scale hybrid rocket motors often provide the means to evaluate the burning rates of new fuel formulations. While the issue of scaling to larger sizes can be significant, the uncertainty level of the laboratory-scale results also needs evaluation. This work quantitatively evaluates the uncertainty of key experimental results for a particular hybrid rocket motor. The scope includes calculation of the uncertainties in the fuel regression rate, oxidizer flux, motor characteristic velocity, and the oxidizer-to-fuel mass ratio for a laboratory-sca le motor. The motor burned gaseous oxygen and hydroxyl-terminated polybutadiene at conditions characteristic of a preburner. The accepted uncertainty methodology of Coleman and Steele established the approach for the study. The results show that the typical uncertainty values are ±8.7% hi the determination of the fuel regression rate, ±10.8% in the oxidizer flux, ±10.5% for motor characteristic velocity, and ±9.2% for the oxidizer-to-fuel ratio. Measurement uncertainties hi the diameters of the initial fuel grain, initial port, and nozzle throat contributed significantly to these conclusions. Conceptual biases in determining the burn duration, the average chamber pressure, and the average burning rate have a significant influence. This evaluation revealed the important measurement limitations and potential improvements for the particular test conditions and data reduction equations used. However, the methodology presented is in generally applicable to hybrid rocket testing.
Providing Video Annotations in Multimedia Containers for Visualization and Research (2017)

There is an ever increasing amount of video data sets which comprise additional metadata, such as object labels, tagged events, or gaze data. Unfortunately, metadata are usually stored in separate files in custom-made data formats, which reduces accessibility even for experts and makes the data inaccessible for non-experts. Consequently, we still lack interfaces for many common use cases, such as visualization, streaming, data analysis, machine learning, high-level understanding and semantic web integration. To bridge this gap, we want to promote the use of existing multimedia container formats to establish a standardized method of incorporating content and metadata. This will facilitate visualization in standard multimedia players, streaming via the Internet, and easy use without conversion, as shown in the attached demonstration video and files. In two prototype implementations, we embed object labels, gaze data from eye-tracking and the corresponding video into a single multimedia container and visualize this data using a media player. Based on this prototype, we discuss the benefit of our approach as a possible standard. Finally, we argue for the inclusion of MPEG-7 in multimedia containers as a further improvement.
Optimization and learning for rough terrain legged locomotion (2011)

We present a novel approach to legged locomotion over rough terrain that is thoroughly rooted in optimization. This approach relies on a hierarchy of fast, anytime algorithms to plan a set of footholds, along with the dynamic body motions required to execute them. Components within the planning framework coordinate to exchange plans, cost-to-go estimates, and ‘certificates’ that ensure the output of an abstract high-level planner can be realized by lower layers of the hierarchy. The burden of careful engineering of cost functions to achieve desired performance is substantially mitigated by a simple inverse optimal control technique. Robustness is achieved by real-time re-planning of the full trajectory, augmented by reflexes and feedback control. We demonstrate the successful application of our approach in guiding the LittleDog quadruped robot over a variety of types of rough terrain. Other novel aspects of our past research efforts include a variety of pioneering inverse optimal control techniques as well as a system for planning using arbitrary pre-recorded robot behavior.
Refinement of the grain structure of additive manufactured titanium alloys via epitaxial recrystallization enabled by rapid heat treatment (2020)

The coarse prior-β grain structure in titanium alloys produced by additive manufacturing is associated to mechanical anisotropy and limited fatigue life. Here we report a novel methodology to refine such structure by rapid heat treatment of Ti–6Al–4V produced by laser powder-bed fusion. The refinement was analysed using high-temperature EBSD that showed, for the first time, how high angle boundary β grains nucleated and grew with quasi-equiaxed morphology by epitaxial recrystallization. These findings show the potential for such heating regime to be applied to control grain size, morphology and distribution in a wider category of structural alloys produced by additive manufacturing.
Novel Multifunctional Biosurfactant Obtained from Corn as a Stabilizing Agent for Antidandruff Formulations Based on Zn Pyrithione Powder (2020)

The cosmetic industry provides a wide variety of shampoos to treat dandruff, containing insoluble ingredients such as Zn pyrithione. However, the solubility of this active ingredient is quite limited in both water and oil media; thus, antidandruff formulations must include a large amount of chemically synthesized stabilizing ingredients to avoid their precipitation. In this work, the stabilization of Zn pyrithione in O/W emulsions using a biosurfactant (BS) extract and Tween 80 is studied. The study includes an incomplete factorial design based on the tea tree oil/water ratio and both surfactant and biosurfactant concentrations. The formulations are characterized in terms of particle size, stability after 30 days, and solubility of Zn pyrithione. The formulation that provided the most favorable results contains Tween 80 (5%) and BS extract (2.5%), with an O/W ratio of 0.01. This provides the smallest particle size (40.5 μm), good stability after 30 days (91.0%), and the highest solubility of Zn pyrithione (59%). The results obtained enable the use of the combination of BS extract and Tween 80 as bio/surfactants of antidandruff shampoo formulations, along with another antiseptic agent such as tea tree oil. Furthermore, this is the first work where a biosurfactant is considered to be a stabilizing agent in antidandruff formulations.
Clinical evaluation of 0.5% ferric hyaluronate adhesion prevention gel for the reduction of adhesions following peritoneal cavity surgery: open-label pilot study (1998)

The objective of this study was to assess the safety and to make a preliminary assessment of the efficacy of 0.5% ferric hyaluronate adhesion prevention gel in reducing adhesions in patients undergoing peritoneal cavity surgery by laparotomy, with a planned 'second-look' laparoscopy. The study was a randomized, open-label, placebo-controlled, parallel-group design in patients desirous of fertility at the Women's and Children's Hospital, Department of Obstetrics and Gynecology, University of Southern California School of Medicine, Los Angeles, California. Female patients aged 24 to 41 years received 300 ml 0.5% ferric hyaluronate adhesion prevention gel or lactated Ringer's solution as an intraperitoneal instillate at the completion of the laparotomy procedure. At second-look laparoscopy 4-12 weeks after the laparotomy, the presence of adhesions was evaluated. Haematology and serum chemistry were determined throughout the study interval. All patients tolerated the procedures well and did not manifest any serious adverse events. At second-look laparoscopy, patients treated with 0.5% ferric hyaluronate adhesion prevention gel had significantly fewer adhesions than control patients. When adhesions did form, they were significantly less extensive and less severe in patients who received 0.5% ferric hyaluronate adhesion prevention gel. In conclusion, 0.5% ferric hyaluronate adhesion prevention gel was safe and highly efficacious in the reduction of the number, severity and extent of adhesions throughout the entire abdomen following peritoneal cavity surgery.
A COSTAR interface using WWW technology. (1998)

The concentration of industry on modern relational databases has left many nonrelational and proprietary databases without support for integration with new technologies. Emerging interface tools and data-access methodologies can be applied with difficulty to medical record systems which have proprietary data representation. Users of such medical record systems usually must access the clinical content of such record systems with keyboard-intensive and time-consuming interfaces. COSTAR is a legacy ambulatory medical record system developed over 25 years ago that is still popular and extensively used at the Massachusetts General Hospital. We define a model for using middle layer services to extract and cache data from non-relational databases, and present an intuitive World-Wide Web interface to COSTAR. This model has been implemented and successfully piloted in the Internal Medicine Associates at Massachusetts General Hospital.
A Real-time Transport Protocol (RTP) Header Extension for Client-to-Mixer Audio Level Indication (2011)

This document defines a mechanism by which packets of Real-Time
Transport Protocol (RTP) audio streams can indicate, in an RTP header
extension, the audio level of the audio sample carried in the RTP
packet. In large conferences, this can reduce the load on an audio
mixer or other middlebox which wants to forward only a few of the
loudest audio streams, without requiring it to decode and measure
every stream that is received.
Dependence of polarization, gain, linewidth enhancement factor, and K factor on the sign of the strain of InGaAs/InP strained-layer multiquantum well lasers (1991)

The sign of the strain in a multiquantum well (MQW) active layer of an InGaAs/InP laser determines whether lasing occurs from the electron–heavy hole transition or from the electron-light hole transition. Lasing from the electron-light hole transition is reported to provide a much better performance than predicted by theory. It is concluded that this gives the best device performance, providing a higher differential gain, a lower threshold current, a record low linewidth enhancement factor of 1.5, and a K factor of 0.22 ns, potentially allowing a 3 dB modulation bandwidth of 40 GHz.
Characterization of Mutations Contributing to Sulfathiazole Resistance in <i>Escherichia coli</i> (1998)

A sulfathiazole-resistant dihydropteroate synthase (DHPS) present in two different laboratory strains of Escherichia coli repeatedly selected for sulfathiazole resistance was mapped to folP by P1 transduction. The folP mutation in each of the strains was shown to be identical by nucleotide sequence analysis. A single C-->T transition resulted in a Pro-->Ser substitution at amino acid position 64. Replacement of the mutant folP alleles with wild-type folP significantly reduced the level of resistance to sulfathiazole but did not abolish it, indicating the presence of an additional mutation(s) that contributes to sulfathiazole resistance in the two strains. Transfer of the mutant folP allele to a wild-type background resulted in a strain with only a low level of resistance to sulfathiazole, suggesting that the presence of the resistant DHPS was not in itself sufficient to account for the overall sulfathiazole resistance in these strains of E. coli. Additional characterization of an amplified secondary resistance determinant, sur, present in one of the strains, identified it as the previously identified bicyclomycin resistance determinant bcr, a member of a family of membrane-bound multidrug resistance antiporters. An additional mutation contributing to sulfathiazole resistance, sux, has also been identified and has been shown to affect the histidine response to adenine sensitivity displayed by these purU strains.
Experimental realization of a multiproduct photorefractive correlation system for temporal signals (1997)

The design and operation of a multidimensional photorefractive correlator is described. With a photorefractive medium as the integrator, this system effects the correlation of up to four time-evolving signals. The holographic correlation volume is viewed by projection onto a two-dimensional detector. The correlator is designed for use with binary-phase signals, especially pseudorandom noise sequences.
Research progress in chaotic orthogonal code-division multiplexing acoustic communications (2013)

Chaotic Orthogonal Code-Division Multiplexing (C-OCDM) is a method of encoding digital data on multiple chaotic codes. More than ten years after its introduction, the C-OCDM method is now a mature technology that has been adopted in long-range underwater acoustic communications systems. This paper presents an overview of this method and its applications. Firstly, we review the major evolutions of this method with an emphasis on some key technologies such as the paralleled M-ary mode and the constant envelope multi-signal synthesizing method. Several sea tests corresponding to these technologies are introduced thereafter. Finally, we make a conclusion and propose future research directions of this method.
Understanding radio polarimetry. I. Mathematical foundations (1996)

The measurement of polarized radiation uses entirely different methods at optical and radio wavelengths. As a result, the algebraic analysis of polarimeter performance differs and, in the case of radio interferometry, is unnecessarily complicated. We demonstrate that the mathematical operation of outer matrix multiplication provides the missing link between the two approaches. Within one coherent framework, we then unite the concepts of Stokes parameters and Wolf coherency matrix, the Jones and Mueller calculi from optics, and the techniques of radio interferometry based on multiplying correlators. We relate the polarization performance of a complete radio interferometer to the (matrix) polarization properties of its successive signal processing stages, providing a clear view of how a radio polarimeter works. Our treatment also clarifies the nature of and the relations between the various types of transformations used in optical polarimetry. We develop the analysis from the radio interferometrist's point of view, but include enough background for a wider audience. In a companion paper, we discuss in more detail the application to the calibration of radio interferometer systems; in a third paper we investigate the IAU (1973) radio definition of the Stokes parameters and its precise translation into mathematical form.
Oligodendrocytes secrete exosomes containing major myelin and stress‐protective proteins: Trophic support for axons? (2007)

Oligodendrocytes synthesize the CNS myelin sheath by enwrapping axonal segments with elongations of their plasma membrane. Spatial and temporal control of membrane traffic is a prerequisite for proper myelin formation. The major myelin proteolipid protein (PLP) accumulates in late endosomal storage compartments and multivesicular bodies (MVBs). Fusion of MVBs with the plasma membrane results in the release of the intralumenal vesicles, termed exosomes, into the extracellular space. Here, we show that cultured oligodendrocytes secrete exosomes carrying major amounts of PLP and 2'3'-cyclic-nucleotide-phosphodiesterase (CNP). These exosomes migrated at the characteristic density of 1.10-1.14 g/mL in sucrose density gradients. Treatment of primary oligodendrocytes with the calcium-ionophore ionomycin markedly increased the release of PLP-containing exosomes, indicating that oligodendroglial exosome secretion is regulated by cytosolic calcium levels. A proteomic analysis of the exosomal fraction isolated by sucrose density centrifugation revealed in addition to PLP and CNP, myelin basic protein (MBP) and myelin oligodendrocyte glycoprotein (MOG) as constituents of oligodendroglial exosomes, together with a striking group of proteins with proposed functions in the relief of cell stress. Oligodendroglial exosome secretion may contribute to balanced production of myelin proteins and lipids, but in addition exosomes may embody a signaling moiety involved in glia-mediated trophic support to axons.
Hydrothermal Chemistry of Silicates: Low‐Temperature Synthesis of <i>y</i> ‐Yttrium Disilicate (2003)

The synthesis of crystalline y ‐Y 2 Si 2 O 7 has been achieved at a temperature as low as 365°C. This has been accomplished by following a hydrothermal method and using a layered clay as silicon source, whose structure‐directing character facilitates the nucleation process. The structural characterization of the y ‐Y 2 Si 2 O 7 polymorph is conducted with special emphasis on the MAS‐NMR spectrum. Extending this finding to other binary silicate compounds allows revising the phase diagrams of these systems in the low‐temperature range.
A parallel implementation of Singular Value Decomposition based on Map-Reduce and PARPACK (2011)

In the e-commerce on the Web, recommender systems become a powerful technology for extracting valuable information from its customer databases. These systems also help customers find products they want to buy from a business sites. Singular Value Decomposition(SVD) is a useful technology to speedup the recommendations with very fast online performance, requiring just a few simple arithmetic operations. Unfortunately, computing the SVD of a large scale matrix is very expensive. In this paper, we propose to parallelize the SVD algorithm to run on distributed computers. Our parallel algorithm employs a parallel ARPACK algorithm to perform parallel eigenvalue decomposition. Experimental results show that the proposed method can significantly speed up the SVD computation cost while providing comparable prediction quality.
Dual role of the adenovirus pVI C terminus as a nuclear localization signal and activator of the viral protease (2004)

Adenain, the protease produced by adenovirus, is regulated by formation of a heterodimer with an 11 aa peptide derived from the C terminus of another adenoviral protein, pVI. Here, the role of the basic motif KRRR, which is conserved in pVI sequences from human adenovirus serotypes, was investigated. It was shown that this motif is less important than the N- or C-terminal regions in the formation of the adenain-peptide heterodimer and in the activity of the subsequent complex. This motif, however, acted as a nuclear localization signal that was capable of targeting heterologous proteins to the nucleus, resulting in a distinctive intranuclear distribution consisting of discrete foci, which is similar to that found for pVI during adenovirus infection.
SME Special Session: Subsea Slurry Lift Pump Technology - SMS Development (2012)

Abstract Nautilus Minerals', the world's leader in exploration and development of deepocean seafloor resources, has located a number of Seafloor Massive Sulphide(SMS) deposits in the Bismarck Sea, within the Territorial Waters of Papua NewGuinea. Nautilus' business model is based on the notion of ongoing resourceaccumulation and aggregating numerous high grade SMS systems and tosequentially develop them using a floating production system. Nautilus' project development plans are based on utilizing and / or adaptingexisting technologies from a number of different industries. The offshore oiland gas industry in particular has been a primary source of equipment andtechnology and it is from this industry that Nautilus is procuring a SubseaSlurry Lift Pump (SSLP) to pump slurry from the seafloor to its surfaceproduction vessel. The SSLP under procurement is a 10 chamber positive displacement lift pump. Thepump technology was originally developed to pump drill fluids and cuttings indual gradient drilling of deepwater offshore oil and gas reservoirs. Byallowing the pump's discharge pressure to adjust to changes in the slurry(Viscosity, Density & Solids Concentration), the positive displacement pumpaccommodates variations in flow conditions to remain within its operatingenvelope. The SSLP has a number of direct technical and operational synergiesthat make it ideally suited for application in the SMS productionindustry. This paper provides an overview of the SSLP design and its suitability for theseafloor mineral production industry and also explores alternate slurry pump orlift technologies suited to this new and developing industry.
Cross-Coupling Reactions of Monosubstituted Acetylenes and Aryl Halides Catalyzed by Palladium on Charcoal (1990)

Abstract A convenient procedure for the Pd(O) catalyzed cross-coupling of monosubstituted acetylenes with aryl halides, in which palladium on charcoal serves as the source of the noble metal is described.
Functional anatomy of subthalamic nucleus stimulation in Parkinson disease (2014)

Our method identified DBS-induced behavioral changes that depended significantly on DBS site. These results do not support complete functional segregation within STN, because movement improved with DBS throughout, and mood improved with dorsal STN DBS. Rather, findings support functional convergence of motor, cognitive, and limbic information in STN.
Effect of an electric vehicle bus network on guwahati grid (2017)

In this work a zero emission public transportation system is proposed. This system uses electric buses and super- capacitors are used as an on-board energy source. Since, it is public transportation system, the bus stops are located every 1-2 kilometers. Each bus stop acts as a charging point and when the bus stops, for passengers to board and de-board, the supercapacitors charge with enough energy to travel 4-5 kilometers. This arrangement obviates the use of high capacity battery on the bus and thus reduces the weight of the system. Furthermore, the presence of the high capacity battery has been validated by analysing grid profile and per unit voltage profile.
LTE-WLAN aggregation (LWA) in 3GPP Release 13 & Release 14 (2017)

Integrating different radio access technologies (RATs) is one effective method to meet the demand to provide ever increasing data rates to the users. For integrating LTE and WLAN in particular, the purpose is to enhance the operators control of when the UE uses WLAN. Another aim, in addition to better network control on which RAT is used, is the possible data aggregation which enables simultaneous utilization of both resources. In this paper, we present LTE-WLAN Aggregation (LWA) as specified in 3GPP and compare it to the LTE-WLAN Radio Level Integration with IPsec tunnel (LWIP), also specified in 3GPP. In addition, we provide simulation results comparing the schemes in an example scenario.
Technische Biologie und Bionik (1998)

Der Vergleich von Lebewesen mit Maschinen hat die Biologie auf der einen Seite, die Technik auf der anderen beeinflußt, stimuliert und weiter gebracht. Er hat den Gang der Erkenntnisse aber auch gehemmt. Die Abhandlungen dieses Bandes belegen beide Aspekte in vielfacher Weise. Heutzutage erscheinen uns manche Vergleiche dieser Art meist nur noch wissenschaftshistorisch bedeutsam. Man steckt sie, etwas hilflos, in eine der vielen Schubladen der Forschungsgeschichte. Unsere Zeit mißt ihnen, gerade wegen der nicht selten naiv erscheinenden Direktheit früherer Vergleiche, kaum mehr eine funktionelle Bedeutung bei. — Sind heute Vergleiche zwischen Biologie und Technik überhaupt noch (oder wieder ?) sinnvoll ?
Fabrication of nanometer-scale mechanical devices incorporating individual multiwalled carbon nanotubes as torsional springs (2003)

We report on the fabrication of nanometer-scale mechanical devices incorporating multiwalled carbon nanotubes (MWNTs) as the torsional spring elements. We have employed electron beam lithography to pattern device elements directly onto individual MWNTs on a silicon dioxide substrate. The structures were suspended by etching the substrate and subsequent critical-point drying of the sample. We also briefly present characterization of the torsional properties of an individual MWNT. The techniques described are applicable to other nanometer-scale rod-like objects.