gebhart/patrepeval huggingface dataset:
Organometallic chemical vapor deposition routes to high <i>T</i> <i>c</i> superconducting Tl-Ba-Ca-Cu-O films (1989)

Films of the Tl-Ba-Ca-Cu-O high Tc superconductor can be prepared by either of two organometallic chemical vapor deposition routes. Ba-Ca-Cu-O films are first prepared on yttria-stabilized zirconia using the volatile precursors Ba(heptafluorodimethyloctanedionate)2, Ca(dipivaloylmethanate)2, and Cu(acetylacetonate)2. Deposition is carried out at 5 Torr pressure with argon as the carrier gas and water vapor as the reactant gas. Thallium is next incorporated in these films either by vapor diffusion using bulk Tl-Ba-Ca-Cu-O as the source, or by organometallic chemical vapor deposition using Tl(cyclopentadienide) as the source. The latter deposition is carried out at atmospheric pressure with an argon carrier and water-saturated oxygen reactant, followed by rapid thermal annealing. Both types of films consist primarily of the TlBa2Ca2Cu3Ox phase, have preferential orientation of the CuO planes parallel to the substrate surface, and exhibit onset of superconductivity at ∼120 K with zero resistance by 100 K.
Joint Crosstalk-Avoidance and Error-Correction Coding for Parallel Data Buses (2016)

Decreasing transistor sizes and lower voltage swings cause two distinct problems for communication in integrated circuits. First, decreasing inter-wire spacing increases interline capacitive coupling, which adversely affects transmission energy and delay. Second, lower voltage swings render the transmission susceptible to various noise sources. Coding can be used to address both these problems. So-called crosstalk-avoidance codes mitigate capacitive coupling, and traditional error-correction codes introduce resilience against channel errors. Unfortunately, crosstalk-avoidance and error-correction codes cannot be combined in a straightforward manner. On the one hand, crosstalk-avoidance encoding followed by error-correction encoding destroys the crosstalk-avoidance property. On the other hand, error-correction encoding followed by crosstalk-avoidance encoding causes the crosstalk-avoidance decoder to fail in the presence of errors. Existing approaches circumvent this difficulty by using additional bus wires to protect the parities generated from the output of the error-correction encoder, and are therefore inefficient. In this work we propose a novel joint crosstalk-avoidance and error-correction coding and decoding scheme that provides higher bus transmission rates compared to existing approaches. Our joint approach carefully embeds the parities such that the crosstalk-avoidance property is preserved. We analyze the rate and minimum distance of the proposed scheme. We also provide a density evolution analysis and predict iterative decoding thresholds for reliable communication under random bus erasures. This density evolution analysis is nonstandard, since the crosstalk-avoidance constraints are inherently nonlinear.
Accurate estimation of memory polynomial model dimension for dynamic nonlinear RF power amplifiers (2015)

In this paper, the dimension estimation of memory polynomial based power amplifiers' behavioral models is investigated. Comprehensive study of state of the art performance assessment metrics is carried out. To ensure the generality of the conclusions, the study is experimentally validated using three power amplifiers prototypes designed using various transistors technologies and amplifier topologies. The results show that the performance assessment metrics are equally reliable for the estimation of the device under test nonlinearity order. However, they are inconsistent when used to estimate its memory depth. This limitation is circumvented by applying memoryless post-compensation technique during the memory depth estimation. The proposed approach demonstrates that the dimension estimation can be made objective and independent of the performance assessment metric.
Analysis of testis‐specific transcripts in the chicken (2005)

Sequences of candidate chicken testis-specific genes were analysed in order to develop a resource for functional genomic studies of the testis and male germ cells. Tentative consensus sequences (TC) containing expressed sequence tags expressed in testis libraries were selected from the TIGR Gallus gallus Gene Index, resulting in 292 TC. The transcriptional expression of these genes were evaluated in several chicken tissues, including testis and ovary. One hundred ten of the 292 TC were expressed in a testis-specific manner. Annotation of the TC using the Gene Ontology database terms showed that the proportion of testis-specific TC that were classified as having catalytic activity (within the molecular function branch) was higher than the proportion of total chicken TC classified in the same way. Our results may facilitate the investigation of testis-specific genes and their functional analysis in the chicken, as well as in other avian species.
Femtosecond IR laser fabrication of Bragg gratings in photonic crystal fibers and tapers (2006)

Fiber Bragg gratings were written in pure silica photonic crystal fibers (PCFs) and PCF tapers with 125-fs 800-nm infrared radiation. High reflectivities were achieved with short exposure times in the tapers. Both multimode and single-mode grating reflections were achieved in the fiber tapers.
IEEE 802.11s MAC Fundamentals (2007)

The tremendous success of the Institute of Electronics and Electrical Engineering (IEEE) 802.11 wireless local area network (WLAN) standard led to severe competition. Due to Wi-Fi Alliance (WFA)'s marketing, 802.11 became a universal solution for wireless connectivity. However, still a WLAN depends on wired infrastructure that interconnects the central access points (APs). To become independent of backbone networks leading to cheap deployments, the traditional single-hop approach needs to be replaced by wireless mesh networks (WMNs). Since several years, the research community develops routing protocols designed for wireless multi-hop networks. With 802.11s an integrated WMN approach is under development that adds the necessary functionality for interworking, security and routing. As its medium access control (MAC), 802.11s relies on the existing schemes. However, the current 802.11 MAC has been designed for wireless single-hop networks. Its application to WMNs leads to low performance. The capacity of the wireless medium can hardly be exploited. Thus, 802.11s provides an optional MAC that has been specifically designed for WMN. In this paper we explain the fundamental operation of the 802.11s MAC, explain its extensions and provide detailed simulation results on their performance.
Percussive augmenter of rotary drills (PARoD) (2012)

Increasingly, NASA exploration mission objectives include sample acquisition tasks for in-situ analysis or for potential sample return to Earth. To address the requirements for samplers that could be operated at the conditions of the various bodies in the solar system, a piezoelectric actuated percussive sampling device was developed that requires low preload (as low as 10N) which is important for operation at low gravity. This device can be made as light as 400g, can be operated using low average power, and can drill rocks as hard as basalt. Significant improvement of the penetration rate was achieved by augmenting the hammering action by rotation and use of a fluted bit to provide effective cuttings removal. Generally, hammering is effective in fracturing drilled media while rotation of fluted bits is effective in cuttings removal. To benefit from these two actions, a novel configuration of a percussive mechanism was developed to produce an augmenter of rotary drills. The device was called Percussive Augmenter of Rotary Drills (PARoD). A breadboard PARoD was developed with a 6.4 mm (0.25 in) diameter bit and was demonstrated to increase the drilling rate of rotation alone by 1.5 to over 10 times. Further, a large PARoD breadboard with 50.8 mm diameter bit was developed and its tests are currently underway. This paper presents the design, analysis and preliminary test results of the percussive augmenter.
Comparative analysis of the biosynthetic systems for fungal bicyclo[2.2.2]diazaoctane indole alkaloids: the (+)/(−)-notoamide, paraherquamide and malbrancheamide pathways (2012)

The biosynthesis of fungal bicyclo[2.2.2]diazaoctane indole alkaloids with a wide spectrum of biological activities have attracted increasing interest. Their intriguing mode of assembly has long been proposed to feature a non-ribosomal peptide synthetase, a presumed intramolecular Diels-Alderase, a variant number of prenyltransferases, and a series of oxidases responsible for the diverse tailoring modifications of their cyclodipeptide-based structural core. Until recently, the details of these biosynthetic pathways have remained largely unknown due to lack of information on the fungal derived biosynthetic gene clusters. Herein, we report a comparative analysis of four natural product metabolic systems of a select group of bicyclo[2.2.2]diazaoctane indole alkaloids including (+)/(-)-notoamide, paraherquamide and malbrancheamide, in which we propose an enzyme for each step in the biosynthetic pathway based on deep annotation and on-going biochemical studies.
Submergence detection for electro acoustic transducers (2004)

A method of detecting actual or incipient submersion of an electroacoustic transducer (2) facing downwardly toward a surface of fluent material to be sensed in a pulse-echo acoustic ranging system, the transducer having a skirt (6) surrounding a downwardly facing radiating surface (4) to maintain an air space (10) beneath the radiating surface even under submergence conditions, and the transducer being electrically energized to emit pulses of acoustic energy from the radiating surface, the system processing an electrical output received from the transducer following a pulse by repeatedly sampling it to obtain a response profile. Samples from an initial portion of the response of the transducer during a ring-down period following the transmit pulse are summed (FIG. 2) in a manner such as to eliminate from the sum portions of each sample due to echo responses above a threshold determined on the basis of preceding samples, and the sum is compared with a predetermined threshold to determine whether submergence is indicated. Typically, the amplitude of each sample is compared with the lowest amplitude sample previously detected, and that lowest amplitude is substituted in the sum for the sample amplitude if lower than the latter.
Vegetative insecticidal protein enhancing the toxicity of Bacillus thuringiensis subsp kurstaki against Spodoptera exigua (2006)

Commercial B. thuringiensis strain YBT1520 has high toxicity against H. armigera and Plutella xylostella, but almost no activity against S. exigua, which is a major crop pest in China. This work provides a new strategy for widening the activity spectrum of B. thuringiensis against agriculture pests.
Dithiol Aryl Arsenic Compounds as Potential Diagnostic and Therapeutic Radiopharmaceuticals (2016)

Arsenic-72 ((72)As) and (77)As have nuclear properties useful for positron emission tomography (PET) and radiotherapy, respectively. The thiophilic nature of arsenic led to the evaluation of dithioarylarsines for potential use in radiopharmaceuticals. Several dithioarylarsines were synthesized from their arylarsonic acids and dithiols and were fully characterized by NMR, ESI-MS, and X-ray crystallography. This chemistry was translated to the no-carrier-added (nca) (77)As level. Because arsenic was available at the nca nanomolar level only as [(77)As]arsenate, this required addition of an aryl group directly to the As to form the [(77)As]arylarsonic acid. The [(77)As]arsenate was reduced from (77)As (V) to (77)As (III), and a modified Bart reaction was used to incorporate the aryl ring onto the (77)As, which was followed by dithiol addition. Various modifications and optimizations resulted in 95% radiochemical yield of nca [(77)As]p-ethoxyphenyl-1,2-ethanedithiolatoarsine.
The Synthesis of a Potent Selective Inhibitor for Human Enterokinase (1984)

Conference Abstract| February 01 1984 The Synthesis of a Potent Selective Inhibitor for Human Enterokinase D. A. W. Grant; D. A. W. Grant 1Department of Surgery St. George's Hospital Medical School London Search for other works by this author on: This Site PubMed Google Scholar B. M. Austen; B. M. Austen 1Department of Surgery St. George's Hospital Medical School London Search for other works by this author on: This Site PubMed Google Scholar S. Cliffe; S. Cliffe 1Department of Surgery St. George's Hospital Medical School London Search for other works by this author on: This Site PubMed Google Scholar J. Hermon-Taylor J. Hermon-Taylor 1Department of Surgery St. George's Hospital Medical School London Search for other works by this author on: This Site PubMed Google Scholar Clin Sci (Lond) (1984) 66 (2): 50P–51P. https://doi.org/10.1042/cs066050Pb_pt2 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter LinkedIn Cite Icon Cite Get Permissions Citation D. A. W. Grant, B. M. Austen, S. Cliffe, J. Hermon-Taylor; The Synthesis of a Potent Selective Inhibitor for Human Enterokinase. Clin Sci (Lond) 1 February 1984; 66 (2): 50P–51P. doi: https://doi.org/10.1042/cs066050Pb_pt2 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentAll JournalsClinical Science Search Advanced Search This content is only available as a PDF. © 1984 The Biochemical Society and the Medical Research Society1984 Article PDF first page preview Close Modal You do not currently have access to this content.
Simultaneous differentiation and quantitation of erythroblasts and white blood cells on a high throughput clinical haematology analyser (1998)

After the neonatal period, the presence of nucleated red blood cells (NRBC) in peripheral blood is indicative of pathology. Despite the clinical utility of such measurements, automated NRBC counting has hitherto not been available on routine automated blood cell counting analysers. To address this, an automated method for the analysis of NRBC was developed and incorporated into the Abbott Cell Dyn 4000 (CD4000) haematology analyser. The system white blood cell (WBC) reagent was specifically formulated to preserve concomitantly white blood cell (WBC) morphology, rapidly lyse red blood cell and NRBC membranes, and subsequently stain NRBC nuclei with a nucleotide specific fluorochrome dye (Kim et al. 1996a). The fluorochrome itself does not permeabilize the membrane of intact viable white blood cells. The sample is processed by flow cytometry and the signals generated from an argon-ion laser light source are analysed. Axial light loss (AxLL), intermediate angle light scatter (IAS) and red fluorescence (FL3) are used to discriminate between particles of various types. By using these discriminators in a three-dimensional approach, NRBC from a discrete cluster which can easily be separated from leucocytes and enumerated as a distinct cell population during the optical WBC differential analysis. Consequently, accurate absolute WBC counts and differentials can be obtained even in the presence of NRBC. Background 'noise' (both fluorescent and non-fluorescent) from platelets. Howell-Jolly bodies, basophilic stippling, RNA from lysed reticulocytes, and DNA from leucocyte and megakaryocytic fragments are essentially eliminated (Kim et al. 1996b). While the membranes of intact and viable leucocytes remain impermeable to the passage of the fluorochrome stain, leucocytes with damaged membranes are permeable to the dye and generate FL3+ signals. Such cells, which are commonly seen as a consequence of sample ageing as well as in some distinctive pathologies, are identified by the algorithm (using their AxLL signal size) and are labelled as non-viable. Moreover, because non-viable leucocytes are retained in the WBC count and differential analyses, the CD4000 is further able to provide both numerical and graphical data regarding the relative frequency of viable and non-viable components. This additional information can serve as valuable 'decision-drivers' in the laboratory data review process.
Addendum: ‘‘Low noise YBa2Cu3O7−<i>x</i>-SrTiO3-YBa2Cu3O7−<i>x</i> multilayers for improved superconducting magnetometers’’ [Appl. Phys. Lett. <b>66</b>, 373 (1995)] (1995)

The improvement in performance of superconducting magnetometers is discussed. It is demonstrated that the use of multilayer devices in a flip-chip arrangement, enables one to select the lowest noise SQUID from several made on a single substrate. (AIP)
Balancing new technology: Virtual reality for balance measurement case report (2023)

Data from this case study suggest that VRSway measurements are highly correlated with output from force plate technology posing that VRSway is a novel approach to evaluate balance measures with VR. More research is required to understand possible uses of VR-based use for balance measurement in a larger and more diverse cohort.
Reflective long period grating based temperature sensor (2021)

We experimentally demonstrate a reflective long period grating based temperature sensor with a temperature sensitivity coefficient of 0.046 nm/°C in the range between 23°C and 200°C. Compared to traditional metal coating methods, such as evaporation, we used a cost-effective brush coating method to coat silver on both the end facet and a 60cm long tail end of the fiber beyond a long period grating (LPG) to realize a reflection mode LPG. The measured optical spectrum of the fabricated reflective LPG completely mimics the transmitted spectrum with reduced intensity. This cost-effective method for coating metal will pave the way for inexpensive LPG and other optical fiber sensor manufacturing and widespread utilization.
Qualification Testing Of Flexible Pipes For 3000m Water Depth (2011)

Abstract The paper is relevant to riser technology and specifically, qualification of flexible pipes for water depths up to 3,000m. This paper describes a comprehensive program aimed at the qualification of flexible pipes for ultradeep water applications. The primary design driver for ultradeep water flexible pipe applications is the resistance to hydrostatic pressure, in combination with dynamic curvature cycling. The two associated critical failure modes are hydrostatic collapse and lateral buckling of armour wires. Technip have developed dedicated flexible pipe components to address the severe loading conditions encountered in water depths up to 3,000m. Hydrostatic collapse resistance has been addressed by a thick inner carcass layer and a PSI pressure vault. Armour wire lateral buckling, which is induced by axial compression in the armour wires in combination with dynamic curvature cycling, has been addressed by the design and industrialization of new tensile armour wires. The design qualification process for these improvements was completed on two levels. Initially, a large number of pipes were subjected to dynamic cycling testing under high hydrostatic pressure in a hyperbaric chamber so as to determine design limits in terms of pipe diameter, water depth and component sizing. Then, design combinations were selected for testing in a real deepwater environment in the Gulf of Mexico. This second level of tests referred as Deep Immersion Performance (DIP) tests aimed at validating the results obtained from hyperbaric chamber tests. The DIP tests replicated the actual design conditions to which a flexible pipe would be subjected during installation and operation. The development of new and modified flexible pipe components provided a suite of flexible pipe designs suitable for extended water depth application. The final phase of the qualification program, namely the DIP tests, was completed in 2010. It provided design limitations of the new designs for both 9?? and 11?? internal diameter flexible pipes, in sweet and sour service in water depths up to 3,000m This paper clearly demonstrates the suitability of flexible pipes as a valid solution for ultradeep water applications as long as the mechanical behavior of the pipe components is adequately addressed. 1. Introduction and objectives The objective of this paper is to describe the comprehensive R&D project for the qualification of flexible pipes in water depths up to 3000m. The main and primary purpose of this R&D program was to demonstrate that the validation range of our flexible pipes can be extended from depths of 2000 m (as it was before project) to beyond today's market needs in Brazil and the Gulf of Mexico (Figure 1), i.e.3000 m for flexible pipe risers between 7?? and 9??2400 m for 11?? flexible pipe risers. A secondary objective was to extend to 3000 m, the validity range of our design models and of our testing methodology.
Model Checking a Byzantine-Fault-Tolerant Self-Stabilizing Protocol for Distributed Clock Synchronization Systems (2013)

This report presents the mechanical verification of a simplified model of a rapid Byzantine-fault-tolerant self-stabilizing protocol for distributed clock synchronization systems. This protocol does not rely on any assumptions about the initial state of the system. This protocol tolerates bursts of transient failures, and deterministically converges within a time bound that is a linear function of the self-stabilization period. A simplified model of the protocol is verified using the Symbolic Model Verifier (SMV) [SMV]. The system under study consists of 4 nodes, where at most one of the nodes is assumed to be Byzantine faulty. The model checking effort is focused on verifying correctness of the simplified model of the protocol in the presence of a permanent Byzantine fault as well as confirmation of claims of determinism and linear convergence with respect to the self-stabilization period. Although model checking results of the simplified model of the protocol confirm the theoretical predictions, these results do not necessarily confirm that the protocol solves the general case of this problem. Modeling challenges of the protocol and the system are addressed. A number of abstractions are utilized in order to reduce the state space. Also, additional innovative state space reduction techniques are introduced that can be used in future verification efforts applied to this and other protocols.