gebhart/patrepeval huggingface dataset:
Precise Attitude Control System Design for the Tracking of Parabolic Satellite Antenna (2013)

This paper parabolic satellite antenna aims to track the precise location of a moving ship or, in the car that can be used to design the system. That was previously used with the reaction rate of a stepping motor, BLDC motor, in order to suppress the noise two-axis control and a separate encoder to the six degrees of freedom motion system was implemented in a precise location. In order to overcome various disturbances gyro sensor Yaw, Pitch, Roll 3 axes were used. To respond immediately to the disturbance at the same time, two-axis motor by controlling the precise location of the system was designed to compensate instantaneously. In addition, the circle tracking algorithm has applied for our system. We designed that the AGC signal of digital tuner quickly had gone to up to the maximum point. In order to solve the various communication errors such as moving the antenna or ground, we had designed the control system
Coordinated motion of arc welding robots using parallel data processor (2003)

The authors propose an arc welding robot system, where two robots work in coordination. One robot moves the welding target so that the welding puddle lies in a horizontal plane considering the effect of gravity. The other robot moves the welding torch considering the movement of the welding target. A feature of the control system is that a teach and playback method is used since mechanical errors inevitable in practical industrial robots can be compensated for during the teaching task without any additional sensors. Another feature is that a technique to simplify teaching tasks of coordinated motions of two arc welding robots is used. To realize fast data processing of coordinated motions a parallel data processing technique is developed. Due to the use of parallel data processing, two robots can be controlled with accurate movements. Experimental results reveal the applicability of the system.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Waveguide fabrication for integrated optics by electron beam irradiation of silica (1991)

The electron beam process is used to make a variety of optical waveguides in silica. The process uses beam energies in the vicinity of 25 keV to make monomode through to three-moded slab waveguides from 2 to 7- mu m deep with peak-index variations ranging from 10/sup -3/ to 10/sup -2/. Different types of silica were irradiated and the lowest measured losses were 0.3 dB/cm. It is shown that the major loss process arises from surface imperfections at the air/silica interface. The guides are stable up to 400 degrees C. The results show that the use of electron irradiation to increase the refraction index of silica has considerable potential in the technology of integrated optics.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Structure of a Synaptic γδ Resolvase Tetramer Covalently Linked to Two Cleaved DNAs (2005)

The structure of a synaptic intermediate of the site-specific recombinase gammadelta resolvase covalently linked through Ser10 to two cleaved duplex DNAs has been determined at 3.4 angstrom resolution. This resolvase, activated for recombination by mutations, forms a tetramer whose structure is substantially changed from that of a presynaptic complex between dimeric resolvase and the cleavage site DNA. Because the two cleaved DNA duplexes that are to be recombined lie on opposite sides of the core tetramer, large movements of both protein and DNA are required to achieve strand exchange. The two dimers linked to the DNAs that are to be recombined are held together by a flat interface. This may allow a 180 degrees rotation of one dimer relative to the other in order to reposition the DNA duplexes for strand exchange.
Dragonamide E, a Modified Linear Lipopeptide from <i>Lyngbya majuscula</i> with Antileishmanial Activity (2009)

Tropical parasitic and infectious diseases, such as leishmaniasis, pose enormous global health threats, but are largely neglected in commercial drug discovery programs. However, the Panama International Cooperative Biodiversity Group (ICBG) has been working to identify novel treatments for malaria, Chagas' disease, and leishmaniasis through an investigation of plants and microorganisms from Panama. We have pursued activity-guided isolation from an extract of Lyngbya majuscula that was found to be active against leishmaniasis. A new modified linear peptide from the dragonamide series was isolated, dragonamide E (1), along with two known modified linear peptides, dragonamide A (2) and herbamide B (3). Dragonamides A and E and herbamide B exhibited antileishmanial activity with IC50 values of 6.5, 5.1, and 5.9 microM, respectively. Spectroscopic and stereochemical data for dragonamide E (1) and herbamide B (3; the spectroscopic and stereochemical data for this substance is incomplete in the literature) are presented as well as comparisons of biological activity within the dragonamide compound family. Biosynthetic differences among marine compounds with a terminal free amide are also discussed.
Overriding individual harmonic current control with fast dynamics for UPS with nonlinear loads (2005)

When an UPS is loaded with nonlinear loads, significant voltage distortion in the output voltage might occur which is not within the limits of requirements specified by standards. A new control which was proposed for active-filters is adapted to UPS and it makes sure that the inverter supplies all the load harmonic currents so that the output filter capacitor is not loaded with these harmonics and thereby obtaining a very clean sinusoidal output voltage. In the proposed scheme, the PI current controller in the fundamental synchronous reference frame (FSRF) controls the fundamental DC currents and as well as the harmonic references which appear as AC quantities in this frame with fastest dynamics as possible. This controller has zero steady state error for the fundamental DC references and a finite magnitude and phase error for AC references which increases with the order of harmonics. Over-riding individual harmonic current controllers are implemented in their respective reference frames which correct the respective harmonic reference in FSRF such that the converter current is equal to that of load current at that harmonic. Thus excellent dynamic and steady state performance is achieved. Both closed loop and open loop approaches are presented. A 50 kVA lab prototype is built with both three and four leg inverter topologies and the results are given for the same.
Drilling Well Control Practices and Equipment Considerations for Deepwater Operations Plans (1999)

Abstract Everyone recognizes the higher costs and technical challenges associated with drilling in deeper waters. As more information about operating in this frontier becomes known, planning and preparation can improve, reducing costs and risks. This paper will discuss well control issues associated with drilling. It will compare and contrast the requirements of the US MMS (Minerals Management Service), the UK and Australian Safety Case and Verification Schemes, and the Regulations and Guidelines of the NPD (Norwegian Petroleum Directorate). Of particular interest is hazard and risk analysis. For effective risk analysis, one must first identify the magnitudes and type of events that may occur during a drilling or well control operation. Then, the operational capabilities and limitations of the equipment used to deal with such events can be explored to ensure they are fit for purpose. The net result is that not only can hazards be identified, but also their potential consequences estimated - the very essence of a good hazard analysis. As a result, the operator generates information that will improve the safety of his operation as well as his drilling effectiveness and (as a by-product) meet regulatory mandates. Introduction Every drilling program includes risk analyses, completed either explicitly or implicitly. As such, they are conducted for many reasons, including regulatory and prudent business practice. Although more comprehensive analyses undoubtedly reduce risk to a greater level, the expected fruit must be balanced against cost. For the complete drilling process, assessing risks and consequences associated with well control and blowouts is a complex procedure. Fig. 1 (courtesy RF Rogaland) indicates some of the complexities of the procedures and the issues that must be addressed (1). Fig. 1: Example of a comprehensive kick risk analysis (Available in full paper) The results shown in the figure are in the form of probabilities of a kick occurring. The figure is included simply to indicate the scope of a complete analysis. No attempt is made in this paper to show how this complete analysis is carried out. It is only possible to quantify the risks and consequences if sufficient analysis is carried out to allow a process to be broken down into simple steps that then allows for a quantitative (or semi quantitative) assessment of failure on the part of an expert.
Rainbow Trapping in Hyperbolic Metamaterial Waveguide (2013)

The recent reported trapped "rainbow" storage of light using metamaterials and plasmonic graded surface gratings has generated considerable interest for on-chip slow light. The potential for controlling the velocity of broadband light in guided photonic structures opens up tremendous opportunities to manipulate light for optical modulation, switching, communication and light-matter interactions. However, previously reported designs for rainbow trapping are generally constrained by inherent difficulties resulting in the limited experimental realization of this intriguing effect. Here we propose a hyperbolic metamaterial structure to realize a highly efficient rainbow trapping effect, which, importantly, is not limited by those severe theoretical constraints required in previously reported insulator-negative-index-insulator, insulator-metal-insulator and metal-insulator-metal waveguide tapers, and therefore representing a significant promise to realize the rainbow trapping structure practically.
Dependence of resonant tunneling current on Al mole fractions in Al<i>x</i>Ga1−<i>x</i>As-GaAs-Al<i>x</i>Ga1−<i>x</i>As double barrier structures (1987)

Electron transport in AlxGa1−xAs-GaAs-AlxGa1−xAs double barrier tunneling structures is studied as a function of Al content x in the barrier for the case where the thickness of the barrier is 11 atomic layers and that of the GaAs well layer is 7 nm. It is shown that the density JRT of resonant tunneling current varies systematically from 7.0×102 to 3.5×104 A cm−2 as x is varied from 1.0 to 0.43. These data are found to be quantitatively explained by the theoretical calculation, in which the band discontinuity at Γ valley is taken as the barrier height. This result indicates that the electron tunneling through the double barrier structure is dominated by the barrier height of Γ minimum even when the subsidiary minima have lower energies (0.45≤x≤1.0).
Expression of the glucose oxidase gene from <i>Aspergillus niger</i> in <i>Hansenula polymorpha</i> and its use as a reporter gene to isolate regulatory mutations (1993)

The glucose oxidase gene (god) from Aspergillus niger was expressed in Hansenula polymorpha using the methanol oxidase promoter and transcription termination region and the MF-alpha leader sequence from Saccharomyces cerevisiae to direct secretion. The expression cassette was cloned into the S. cerevisiae vector YEp13 and used to transform H. polymorpha strain A16. In the initial transformants plasmid replication was unstable, but was stabilized by a growth regime consisting of alternating cycles of selective and non-selective growth. The stabilized strain was grown to high cell density by fed-batch fermentation. Upon induction of the MOX promoter, glucose oxidase synthesis was initiated. At the end of the fermentation, the culture density was 76 g dry weight/1 and 108 IU/ml (0.5 g/1 or 0.65% dry weight) glucose oxidase was found in the culture medium; a further 86 IU/ml (0.43 g/1 or 0.56% dry weight) was recovered from the cell lysate. A plate assay was used to monitor glucose oxidase levels in individual colonies. This was then used to isolate mutants which showed abnormal regulation of god expression or which showed an altered pattern of secretion. One mutant, which showed increased production of glucose oxidase, was grown to high cell density by fed-batch fermentation (100.6 g/l) and produced 445 IU/ml(2.25 g/l or 2.2% dry weight) extracellularly and 76 IU/ml (0.38 g/l or 0.4% dry weight) intracellularly. The mutant thus not only increased total production but exported 83% of the total enzyme made compared to 55% in the parent strain.
Liquid Chromatographic Analysis of Incurred Amoxicillin Residues in Catfish Muscle Following Oral Administration of the Drug (2000)

Improper application of antibiotic chemicals to livestock and aquaculture species may lead to the occurrence of residues in food supplies. An appropriate depletion period is needed after the administration of drugs to animals for ensuring that residues in edible tissues are below established tolerance levels. This study was conducted to determine incurred amoxicillin residues in catfish muscle following oral administration. Dosed fish were harvested after four depletion periods, and muscle fillets were analyzed for amoxicillin residues using an HPLC method with precolumn derivatization and fluorescence detection. The residue levels in fish after a 6-h depletion ranged from 40 to 64 ng/g with one exception at 297 ng/g. Average residue levels decreased to 5.4 and 2.8 ng/g after 24- and 48-h depletions, respectively. Residue levels after a 72-h depletion decreased to below the method's limit of quantitation (1.2 ng/g). An LC-MS/MS confirmatory method was developed. Confirmation of the presence of amoxicillin was demonstrated in incurred fish samples containing residues at ∼50−300 ng/g. Keywords: LC; amoxicillin; incurred residues; catfish; depletion
A New Approach towards Encryption Schemes: Byte - Rotation Encryption Algorithm (2012)

Information security is a challenging issue in today's technological world. There is a demand for a stronger encryption which is very hard to crack. Earlier many researchers have proposed various encryption algorithms such as AES, DES, Triple DES, RSA, Blowfish etc. Some of them are most popular in achieving data security at a great extent like AES and Blowfish. But, as security level is increased, the time and complexity of algorithm is also increased. This is the major cause of decreasing the speed and efficiency of the encryption system. In this paper we have proposed a new encryption algorithm Byte - Rotation Encryption Algorithm (BREA) with Parallel Encryption Model which enhances the security as well as speed of the encryption scheme. The BREA is applied on different blocks of plaintext and executes in parallel manner through multithreading concept of single processor system. This paper is an attempt to invent a new encryption model which is secure and very fast.
Multi-purpose highly parallel computing (after the killer micros take a breather) (1994)

No abstract available.
Wave-equation reflection traveltime inversion with dynamic warping and hybrid waveform inversion (2013)

In reflection seismology, full waveform inversion (FWI) can generate high-wavenumber subsurface velocity models but often suffers from an objective function with local minima caused mainly by the absence of low frequencies in seismograms. These local minima cause cycle skipping when the smooth low-wavenumber component in the initial velocity model for FWI is far from the true model. To avoid cycle skipping, we propose a new wave-equation reflection traveltime inversion (WERTI) to update the low-wavenumber component of the velocity model, while using FWI to only update high-wavenumber details of the model. A hybrid waveform inversion (HWI) is then implemented by using WERTI and FWI alternatively. The hybrid waveform inversion mitigates the velocity-depth ambiguity and can recover subsurface velocities using only highfrequency reflection data.
Universal method for synthesis of artificial gel antibodies by the imprinting approach combined with a unique electrophoresis technique for detection of minute structural differences of proteins, viruses, and cells (bacteria). III: Gel antibodies against cells (bacteria) (2006)

Artificial antibodies in the form of gel granules were synthesized from the monomers acrylamide and N,N'-methylenebisacrylamide by the imprinting method in the presence of Echerichia coli bacteria as template. The electrophoretic migration velocities of the gel antibodies (i) saturated with the antigen (Escherichia coli MRE-600), (ii) freed of the antigen, and (iii) resaturated with bacteria, were determinated by electrophoresis in a rotating narrow-bore tube of 245 mm length and the 2.5 and 9.6 mm inner and outer diameters, respectively. Removal of bacteria from the gel antibodies was made by treatment with enzymes, followed by washing with SDS and buffer. Gel granules becoming charged by adsorption of bacteria move in an electrical field. We obtained a significant selectivity of gel antibodies for E. coli MRE-600, since the granules did not interact with Lactococcus lactis; and when E. coli BL21 bacteria were added to the gels selective for E. coli MRE-600, a significant difference in the migration rate of the complexes formed with the two strains was observed indicating the ability of differentiation between the two strains. The gel antibodies can be used repeatedly. The new imprinting method for the synthesis of artificial gel antibodies against bioparticles described herein, and the classical electrophoretic analysis technique employed, thus represent - when combined - a new approach to distinguish between different types and strains of bacteria. The application area can certainly be extended to cover other classes of cells.
Tin-119 chemical shifts of ortho, meta, para, 2,6-, and polysubstituted aryltrimethyltin derivatives and related organotin compounds (1975)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTin-119 chemical shifts of ortho, meta, para, 2,6-, and polysubstituted aryltrimethyltin derivatives and related organotin compoundsH. J. Kroth, H. Schumann, H. G. Kuivila, C. D. Schaeffer Jr., and J. J. ZuckermanCite this: J. Am. Chem. Soc. 1975, 97, 7, 1754–1760Publication Date (Print):April 1, 1975Publication History Published online1 May 2002Published inissue 1 April 1975https://pubs.acs.org/doi/10.1021/ja00840a023https://doi.org/10.1021/ja00840a023research-articleACS PublicationsRequest reuse permissionsArticle Views273Altmetric-Citations46LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Ligand-dependent Interaction of Estrogen Receptor-α with Members of the Forkhead Transcription Factor Family (2001)

Estrogen acting through the estrogen receptor (ER) is able to regulate cell growth and differentiation of a variety of normal tissues and hormone-responsive tumors. Ligand-activated ER binds DNA and transactivates the promoters of estrogen target genes. In addition, ligand-activated ER can interact with other factors to alter the physiology and growth of cells. Using a yeast two-hybrid screen, we have identified an interaction between ER alpha and the proapoptotic forkhead transcription factor FKHR. The ER alpha-FKHR interaction depends on beta-estradiol and is reduced significantly in the absence of hormone or the presence of Tamoxifen. A glutathione S-transferase pull-down assay was used to confirm the interaction and localized two interaction sites, one in the forkhead domain and a second in the carboxyl terminus. The FKHR interaction was specific to ER alpha and was not detected with other ligand-activated steroid receptors. The related family members, FKHRL1 and AFX, also bound to ER alpha in the presence of beta-estradiol. FKHR augmented ER alpha transactivation through an estrogen response element. Conversely, ER alpha repressed FKHR-mediated transactivation through an insulin response sequence, and cell cycle arrest induced by FKHRL1 in MCF7 cells was abrogated by estradiol. These results suggest a novel mechanism of estrogen action that involves regulation of the proapoptotic forkhead transcription factors.
A reliability testing environment for off-the-shelf memory subsystems (2000)

A cyclotron-based radiation test environment enables engineers to characterize the soft-error sensitivity of memory subsystems and assess its impact at the system level. Device/circuit modeling and simulation assist the radiation experiments in detecting device-level single-event upsets.
Enhancing TCP throughput of highly available virtual machines via speculative communication (2012)

Checkpoint-recovery based virtual machine (VM) replication is an attractive technique for accommodating VM installations with high-availability. It provides seamless failover for the entire software stack executed in the VM regardless the application or the underlying operating system (OS), it runs on commodity hardware, and it is inherently capable of dealing with shared memory non-determinism of symmetric multiprocessing (SMP) configurations. There have been several studies aiming at alleviating the overhead of replication, however, due to consistency requirements, network performance of the basic replication mechanism remains extremely poor., In this paper we revisit the replication protocol and extend it with speculative communication. Speculative communication silently acknowledges TCP packets of the VM, enabling the guest's TCP stack to progress with transmission without exposing the messages to the clients before the corresponding execution state is checkpointed to the backup host. Furthermore, we propose replication aware congestion control, an extension to the guest's TCP stack that aggressively fills up the VMM's replication buffer so that speculative packets can be backed up and released earlier to the clients. We observe up to an order of magnitude improvement in bulk data transfer with speculative communication, and close to native VM network performance when replication awareness is enabled in the guest OS. We provide results of micro-, as well as application-level benchmarks.
Expression of Dp71 in Müller glial cells: a comparison with utrophin- and dystrophin-associated proteins. (2000)

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