gebhart/patrepeval huggingface dataset:
Dual frequency helical antennas for handsets (2002)

The possibilities to realize the dual frequency operation with different helical antenna configurations have been studied. The simulations and measurements showed that two frequencies of operation could be obtained by combining two helical antennas or by combining the helical antenna with the monopole antenna. This kind of antenna configuration could be used e.g. with dual mode cellular phones operating at two different frequencies.
Postnatal Growth, Differentiation, and Aging of the Mouse Intervertebral Disc (2009)

Growth of the IVD takes place during the first 9 postnatal weeks, although cell proliferation ceases after 3 weeks. After birth, the early postnatal IVD differentiates into 3 tissue types, the NP, the fAF between the vertebrae, and the mineralized endplates over the surfaces of the vertebrae.
Sensing Algorithms and Protocol for Simultaneous Sensing and Reception-Based Cognitive D2D Communications in LTE-A Systems (2017)

We explore the application of simultaneous sensing and reception (SSR) for cognitive communication in orthogonal frequency division multiplexing (OFDM)-based wireless systems such as 3GPP LTE-A which may find application in multi-tier spectrum sharing paradigms such as the spectrum access system. In such a system, a cognitive radio (CR) synchronized to the macro base station (BS) is assumed to exploit the spectral holes in the OFDMA time-frequency grid. We analyze the impact of timing alignment in such a system and show that power control and guard bands are essential to support such an operation. Practical algorithms for SSR with the constant false alarm rate property are developed using the generalized likelihood ratio test principle to protect macro BS users occupying the same transmission resources as the CRs. Subsequently, we propose a transmission-reception protocol with SSR for bidirectional communication between two time-division duplex CRs and compare it to a protocol with only sensing before transmission (SBT). The simulation results show that the sensing overhead in traditional SBT protocols can be much reduced with the use of SSR when the BS activity in adjacent slots is highly correlated.
Automatic part-of-speech tagging for Bengali (2007)

This paper describes our work on building Part-of-Speech (POS) tagger for Bengali. We have use Hidden Markov Model (HMM) and Maximum Entropy (ME) based stochastic taggers. Bengali is a morphologically rich language and our taggers make use of morphological and contextual information of the words. Since only a small labeled training set is available (45,000 words), simple stochastic approach does not yield very good results. In this work, we have studied the effect of using a morphological analyzer to improve the performance of the tagger. We find that the use of morphology helps improve the accuracy of the tagger especially when less amount of tagged corpora are available.
10-Gb/s 360-km Transmission Over Normal-Dispersion Fiber Using Mid-system Spectral Inversion (1993)

The introduction of erbium-doped-fiber optical amplifiers (EDFA’s) has eliminated fiber loss as a fundamental limit to achievable transmission distance. However the embedded fiber plant throughout the world largely contains "normal-dispersion" fiber with a group-velocity dispersion of ~16 ps/km/nm in the erbium-amplifier bandwidth. Therefore, chromatic dispersion is a primary limitation in optically-amplified systems using embedded fiber. Compensation of this dispersion is very important.
Network security-overcome password hacking through graphical password authentication (2011)

A graphical password is an authentication system that works by having the user select from images, in a specific order, presented in a graphical user interface(GUI). The most common computer authentication method is to use alphanumerical usernames and passwords. This method has been shown to have significant drawbacks. For example, user tends to pick a passwords that can be easily guessed. On the other hand, if a password is hard to guess, then it is often hard to remember. In this paper, we conduct a comprehensive survey of the existing graphical password techniques and proposed a new technique. We discuss the strengths and limitations of each method and point out the future research directions in this area. And also major design and implementation issues are clearly explained. The main advantage of this method is it is difficult to hack. For example, If there are 100 images on each of the 8 pages in a 8-image password, there are 100^8 or 10 quadrillion (10,000,000,000,000,000), possible combinations that could form the graphical password. If the system has the built-in delay of only 0.1 second following the selection of each image until the selection of the next page, it would take millions of years to break into the system by hitting it with random image sequences. Therefore hacking by random combination is impossible.
Preventing and removing wax deposition inside vertical wells: a review (2019)

Wax deposition is one of the most challenging flow assurance issues in oil production processes. The related problems span from reservoirs to refineries, but their consequences can be particularly challenging when the affected area is difficult to reach, such as producing wells. The wax deposition in the areas adjoining the bore, the bore face, the tubing string and the pump is the result of the cooling effect, which occurs when the oil flows from the high-pressure reservoir into the wellbore to the surface. During the depressurization the oil expands, and the heat is drawn from the oil. The temperature loss induces crystallization of the wax and the subsequent plugging of the well. In this case, wax deposition leads to the decrease of well flow rates and eventually causes total blockage. This paper sums up the main technologies applied to prevent or remediate the wax deposition formed inside the wells. A comprehensive review was presented, and the main advantages and disadvantages of these techniques were highlighted. For instance, the mechanical removal is still a widely used technique for solving wax problems inside wells, despite being a costly procedure; heating is another frequent used technique, but it can cause formation damage; bacterial treatments still require further studies on site conditions; changing the operational conditions may be undesirable due to other management field circumstances; coating and insulating materials generally are not fully efficient, being required to implement complementary techniques; cold flow was only tested in pipelines and it was not applicable to wells; finally WIT, electric and magnetic field or oscillatory motion are practical applications that have not been fully proven yet.
Distinct mitogenic and cell fate specification functions of <i>wingless</i> in different regions of the wing (1996)

Patterning and proliferation are coordinately controlled in the development of Drosophila imaginal discs. Localized expression of decapentaplegic (dpp) at the anterior-posterior and wingless (wg) at the dorsal-ventral compartment boundaries controls growth of the wing with respect to the A/P and D/V axes. The growth-promoting effects of these organizers are thought to be indirect, since growth is dispersed throughout the disc, and is not localized near the sources of wg or dpp. wg has also been implicated in proximal-distal patterning of the wing hinge. In this report, we present evidence that wg is principally required for local cell proliferation in the hinge. Loss of wg expression leads to a local reduction in cell division, resulting in the deletion of a distinct set of wing hinge structures. Ectopic activation of the wg pathway in cells of the wing hinge leads to overproliferation without repatterning, indicating that wg acts as a mitogen in this part of the disc. By contrast, overexpression of wg in the wing blade leads to repatterning and only secondarily to proliferation. These results suggest that the Wg signal elicits very different responses in different regions of the wing imaginal disc.
New questions about transplantation in multiple myeloma. (2006)

Multiple myeloma is now the most common indication for autologous stem cell transplantation (ASCT) in North America, with over 5,000 transplants performed yearly (Center for International Blood and Marrow Transplant Research [CIBMTR] data). While the role of ASCT as initial therapy in multiple myeloma has been established by randomized studies, newer therapies are challenging the traditional paradigm. The availability of novel induction agents and newer risk stratification tools, and the increasing recognition of durability of remissions are changing the treatment paradigm. However, even with arduous therapy designed to produce more complete remissions-for example, tandem autologous transplants-we have seen no plateau in survival curves. A tandem autologous procedure followed by maintenance therapy may be performed in an attempt to sustain remission. Sequential autologous transplants followed by nonmyeloablative allotransplants are pursued with the hope of "curing" multiple myeloma. We examine how the key challenges of increasing the response rates and maintaining responses are being addressed using more effective induction and/or consolidation treatments and the need for maintenance therapies after ASCT. We argue that given the biologic heterogeneity of multiple myeloma, risk-adapted transplant approaches are warranted. While the role of curative-intent, dose-intense toxic therapy is still controversial, conventional myeloablative allogeneic transplants need to be reexamined as an option in high-risk aggressive myeloma, given improvements in supportive care and transplant-related mortality.
A Parametric Approach to Vehicle Seating Buck Design (2004)

Vehicle package development is an important part of the entire vehicle design. It consists of determining the occupant’s spatial environment, the vehicle’s mechanical spatial configuration and the overall exterior/interior dimensions while meeting the engineering requirements, including packaging, structure, manufacturing, etc. Developing and verifying the occupant compartment configuration is usually conducted by using a seating buck. To build a seating buck, vehicle interior surfaces are generated in CAD using vehicle exterior surfaces, package layouts and master sections. During early program stages, this information is scattered, incomplete and constantly changing, which makes the seating buck creation challenging and the package design decision-making more difficult. A new method has been developed to quickly generate the seating buck surfaces from scattered information. It has shown to significantly reduce the time conventionally required for the seating buck surface modeling. This paper documents the method and process and summarizes the potential of the method and its impact on vehicle package design.
Dynamic target navigation based on multisensor Kalman filtering and neighbor discovery algorithm (2011)

This paper deals with an estimate algorithm which considers optimal control input for dynamic target navigation by using wireless sensor networks and distributed Kalman filter. We propose a novel sensor scheduling algorithm based on a neighbor discovery algorithm for discrete-time linear time-invariant systems. Then we propose an estimate algorithm by sharing predicted estimate values and analyze characteristic of this algorithm. Finally, experimental results show effectiveness of the proposed method in sensor networked feedback systems.
Stable and high emission current from carbon nanotube paste with spin on glass (2005)

We prepared carbon nanotube (CNT) pastes with different inorganic binders such as glass frit and spin on glass (SOG). MWNT powders grown by CVD were used for electron emissive source. The three-roll mill process was carried out for mixing and dispersion of CNT powders in organic vehicle as polymer matrix. CNT paste was printed onto various substrates such as an indium thin oxide (ITO) coated soda lime glass and a nickel plate. Then CNT paste was sintered under different ambient and temperature. For the analysis of the surface morphology of the cathode layer, field-emission scanning electron microscopy (FESEM) was used. The FE characteristics of CNT paste were measured in a high vacuum chamber with a parallel diode type configuration at 5/spl times/10/sup -6/ Torr. We obtained stable and high emission current from CNT paste with SOG. Our experiments have shown that CNT paste with SOG can use as efficient electron emitter in vacuum nanoelectronics such as radio frequency amplifier, field emission display and X-ray tube.
Building open programmable multimedia networks (1997)

Recent advances in distributed systems and transportable software and increasing demand for better quality of service (QoS) control in multiservice networks are driving a reexamination of network software architectures. We established the Comet (Control, Management, and Telemedia) Group at Columbia University's Center for Telecommunications Research to provide comprehensive understanding of network software architecture for the 1990s and beyond. This research focuses on developing new network architectures that support service creation, QoS control, and the joint allocation of computing and communications resources. This provides an opportunity to reconcile the perspectives of the computing and communication communities. Future multiservice (multimedia) networks will carry traffic such as video, audio, and computer data with diverse QoS requirements. Such networks will thus require that we develop ways to manage many physical and logical entities, services, and users.
Properties of Electromagnetic Field Focusing Probe (1988)

The electromagnetic field focusing (EFF) apparatus consists of a radio frequency generator, solenoidal coil, and a hand-held or catheter probe. Applications such as aneurysm treatment, angioplasty, and neurosurgery in various models have been reported. The probe is operated in the near field (within one wavelength of an electromagnetic field source) of a coil inducing eddy currents in biological tissues, producing maximal convergence of the induced current at the probe tip. The probe produces very high temperatures depending on the wattage selected for the given radio frequency of output power. The high temperature can be used in cutting, cauterizing, or vaporizing. The EFF probe is comparable to different types of lasers and to bipolar and monopolar cautery. The EFF probe can be used with catheters or endoscopes. Objectives of this study were to determine what the thermal properties of the EFF probe are and how instrument parameters can be varied to obtain different temperatures in the tissue near the probe tip. In this study an F2 catheter was used as an insulated sheath and the tip of the guide wire was used as the probe tip. Different powers, wave forms, coil-to-probe distances, and probe-tip lengths were tested on a phantom that simulates tissue electrical properties. Some of the experiments were conducted under normal saline to simulate treatment of tissue with body fluids such as blood vessels or brain tissue under normal physiologic conditions. It is concluded that the EFF probe has the advantages of easy manipulation, relative safety, cost effectiveness, and a high degree of spatial control.(ABSTRACT TRUNCATED AT 250 WORDS)
SASH: Enabling continuous incremental analytic workflows on Hadoop (2013)

There is an emerging class of enterprise applications in areas such as log data analysis, information discovery, and social media marketing that involve analytics over large volumes of unstructured and semi-structured data. These applications are leveraging new analytics platforms based on the MapReduce framework and its open source Hadoop implementation. While this trend has engendered work on high-level data analysis languages, NoSQL data stores, workflow engines etc., there has been very little attention to the challenges of deploying analytic workflows into production for continuous operation. In this paper, we argue that an essential platform component for enabling continuous production analytic workflows is an analytics store. We highlight five key requirements that impact the design of such a store: (i) efficient incremental operations, (ii) flexible storage model for hierarchical data, (iii) snapshot support (iv) object-level incremental updates, and (v) support for handling change sets. We describe the design of SASH, a scalable analytics store that we have developed on top of HBase to address these requirements. Using the workload from a production workflow that powers search within IBM's intranet and extranet, we demonstrate orders of magnitude improvement in IO performance using SASH.
Interdimer exchange in linear chain copper acetate-pyrazine (1974)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterdimer exchange in linear chain copper acetate-pyrazineJ. S. Valentine, A. J. Silverstein, and Z. G. SoosCite this: J. Am. Chem. Soc. 1974, 96, 1, 97–103Publication Date (Print):January 1, 1974Publication History Published online1 May 2002Published inissue 1 January 1974https://pubs.acs.org/doi/10.1021/ja00808a016https://doi.org/10.1021/ja00808a016research-articleACS PublicationsRequest reuse permissionsArticle Views366Altmetric-Citations84LEARN 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
Na 0.5 K 0.5 NbO 3 thin films for voltage controlled acoustoelectric device applications (2002)

Perovskite Na0.5K0.5NbO3 (NKN) thin films have been prepared on Y+36° cut single crystal quartz substrates using the pulsed laser ablation technique. X-ray diffraction θ–2θ and ω-scan data demonstrate almost perfectly c-axis oriented film textures with narrow mosaic broadening. Radio frequency dielectric spectroscopy showed that the films possess relatively high dielectric permittivities, low dielectric losses, and low frequency dispersions. Capacitance–voltage (C–V) measurements for a 2 μm slot NKN/quartz interdigital capacitor yield 23.1% tunability by applying 40 V bias at 1 MHz, while C–V hysteresis indicates polarization reversal. The considerable voltage tunability with superior crystallinity in piezoelectric NKN films on quartz substrates suggests their potential use for novel voltage tunable acoustoelectric devices.
Fully conformal FSS via rapid 3D prototyping (2012)

Prototype fabrication of microwave antennae and metamaterials has been dominated by planar manufacturing techniques, complicating experimental validation of designs that utilize more than two dimensions. This paper introduces a methodology that enables the rapid fabrication of electromagnetic prototypes with complex surfaces. As an example, a conformal frequency selective surface is presented in the form of a paraboloid patterned with an array of cross loop features. Experiments confirm the surface exhibits a stop band at 12.5 GHz, achieving a 30dB drop in power transmission.
Unique Regulation of CCL18 Production by Maturing Dendritic Cells (2003)

Dendritic cells (DC) orchestrate the trafficking of lymphocytes by secreting chemokines with different specificity and function. Chemokines are produced at higher levels by mature DC. This study shows that CCL18 is one of the most abundant chemokines produced by immature DC. In contrast to all other chemokines investigated to date, CCL18 was selectively down-regulated during the maturation process induced by LPS, TNF, CD40 ligand, Staphylococcus aureus Cowan I, Candida albicans, and influenza virus. IL-10 and vitamin D(3), two known inhibitors of DC differentiation and function, strongly promoted CCL18 secretion, whereas IFN-gamma, a costimulator of DC function, inhibited its production. IL-10 also induced CCL18 secretion in blood myeloid DC. No CCL18 secretion was observed in blood plasmacytoid DC. The opposite pattern of regulation was observed for CCL20, a prototypic inflammatory chemokine. CCL18 was found to be a chemotactic factor for immature DC. Therefore, CCL18 may act as a chemotactic signal that promotes the colocalization of immature DC with naive T lymphocytes in an IL-10-dominated environment with the consequent generation of T regulatory cells. These characteristics suggest that CCL18 may be part of an inhibitory pathway devoted to limiting the generation of specific immune responses at peripheral sites.
Nonvolatile main memory aware garbage collection in high-level language virtual machine (2015)

Non-volatile memories (NVMs) such as Phase Change Memory (PCM) have been considered as promising candidates of next generation main memory for embedded systems due to their attractive features. These features include low power, high density, and better scalability. However, most existing NVMs suffer from two drawbacks, namely, limited write endurance and expensive write operation in terms of both time and energy. These problems are worsen when modern high-level languages employ virtual machine with garbage collector that generates a large amount of extra writes on non-volatile main memory. To tackle this challenge, this paper proposes three techniques: Living Objects Remapping (LORE), Dead Object Stamping (DOS), and Smart Wiping with Maximum Likelihood Estimation (SMILE) to reduce the unnecessary writes when garbage collector handles objects. The experimental results show that the proposed techniques not only significantly reduce the writes during each garbage collection cycle but also greatly improve the performance of virtual machine.
Height frequency electro-hydraulic vibration exciter with 2D valve (2008)

The electro-hydraulic exciter is characterized by the larger output force and amplitude. For the purpose of enhancing the frequency of electro-hydraulic vibration exciter, a new type of 2D digital directional control valve is presented. The configuration is designed with two motions freedom of a single spool, the rotary motion of the spool is driven by a stepper motor continually, the linear motion of the spool is actuated by another stepper motor with the eccentric mechanism, and the output flow rate can be controlled by changing the area of valve port periodically. It has advantage of simple configuration, anti-pollution, high frequency, no hysteresis and direct digital control. The input signal has a strict periodicity theoretically, and the variety regularity is sinusoidal wave.