scispace - formally typeset
Search or ask a question

Showing papers by "James Taylor published in 1993"


Journal ArticleDOI
TL;DR: In this paper, an up-to-date compilation of the principal observed parameters of 558 pulsars, including positions, timing parameters, pulse widths, flux densities, proper motions, distances, and dispersion, rotation, and scattering measures, is presented.
Abstract: We present an up-to-date compilation of the principal observed parameters of 558 pulsars, including positions, timing parameters, pulse widths, flux densities, proper motions, distances, and dispersion, rotation, and scattering measures. We also list the orbital elements of binary pulsars and some commonly used parameters derived from the basic measurements. Uncertainties are quoted for most quantities, and references to the original literature are given. Figures are used to illustrate the sample distributions of some of the more important parameters. Machine-readable versions of the tabulated information are available, together with software designed to make the data base useful to others working in the field

683 citations


Journal ArticleDOI
TL;DR: Anti-B4-bR can be administered safely by 7-day continuous infusion with tolerable, reversible toxicities to patients with relapsed B-cell neoplasms and will be used in patients with lower tumor burdens to circumvent the obstacle of immunotoxin delivery to bulk disease.
Abstract: PURPOSEThis phase I trial was undertaken to determine the maximum-tolerated dose (MTD) and dose-limiting toxicities (DLTs) of the B-cell-restricted immunotoxin anti-B4-blocked ricin (anti-B4-bR) when it is administered by 7-day continuous infusion.PATIENTS AND METHODSThirty-four patients with relapsed and refractory B-cell neoplasms (26 non-Hodgkin's lymphoma [NHL], four chronic lymphocytic leukemia [CLL], four acute lymphoblastic leukemia [ALL]) received 7-day continuous infusion anti-B4-bR. Successive cohorts of at least three patients were treated at doses of 10 to 70 micrograms/kg/d for 7 days with the dose increased by 10 micrograms/kg/d for each cohort. The initial three cohorts of patients (10, 20, and 30 micrograms/kg/d x 7 days) also received a bolus infusion of 20 micrograms/kg before beginning the continuous infusion.RESULTSThe MTD was reached at 50 micrograms/kg/d x 7 days. The DLTs were National Cancer Institute Common Toxicity Criteria (NCI CTC) grade IV reversible increases in AST and ALT, ...

157 citations


Journal ArticleDOI
TL;DR: The data suggest that, in the doses used, neither codeine nor dextromethorphan is superior to placebo in treating night cough in children.

116 citations


Journal ArticleDOI
TL;DR: The results of such experiments improve rapidly as the span of repeated observations lengthens, and in one instance the relevant data span is now approaching 20 years as discussed by the authors, and these results are fully consistent with relativity.
Abstract: Measurements of the times of arrival of pulsar signals at Earth provide uniquely powerful tools for experiments in relativistic gravity. The results of such experiments improve rapidly as the span of repeated observations lengthens, and in one instance the relevant data span is now approaching 20 years. The author briefly summarizes and updates two of the most important results of pulsar timing experiments pertinent to relativity and gravitation. The rate of orbital period decay of binary pulsar PSR B1913+16 has been measured with accuracy 0.35%, and is found to be in excellent accord with the prediction for gravitational radiation damping in general relativity. A more recently discovered binary pulsar system, PSR B1534+12 has provided a unique test of strong-field gravitational effects-and these results, too, are fully consistent with relativity.

88 citations


Journal ArticleDOI
TL;DR: In this paper, the authors measured the rate of the general relativistic advance of the longitude of periastron for the pulsar PSR B1802-07:ω#78=0°.
Abstract: The measurement or constraint of the masses of neutron stars and their binary companions test theories of neutron star structure and of pulsar formation and evolution. We have measured the rate of the general relativistic advance of the longitude of periastron for the pulsar PSR B1802-07:ω#78=0°.060±0°.009 yr −1 , which implies a total system mass, pulsar plus companion star, of M=1.7±0.4 M ○ .. We also present a much improved measurement of the rate of periastron advance for PSR B2303+46:ω#78=0°.0099±0°.0002 yr −1 , implying M=2.53±0.08 M ○ . for this system

81 citations


Journal ArticleDOI
TL;DR: 250-fs pulses have been generated directly from a passively mode-locked ytterbium–erbium figure-of-eight laser, made to produce regular pulse bursts at the round-trip frequency, with repetition rates in excess of 300 GHz.
Abstract: 250-fs pulses have been generated directly from a passively mode-locked ytterbium–erbium figure-of-eight laser. In addition to the usual characteristic of one pulse per round trip, the laser could be made to produce regular pulse bursts at the round-trip frequency, with repetition rates in excess of 300 GHz.

77 citations


Journal ArticleDOI
TL;DR: In this paper, the authors measured the rate of the general relativistic advance of the longitude of periastron for the pulsar PSR B1802$-$07.
Abstract: The measurement or constraint of the masses of neutron stars and their binary companions tests theories of neutron star structure and of pulsar formation and evolution. We have measured the rate of the general relativistic advance of the longitude of periastron for the pulsar PSR B1802$-$07: $\dot\omega=0\fdg060\pm0\fdg009\,\mbox{yr}^{-1}$, which implies a total system mass, pulsar plus companion star, of $M=1.7\pm0.4\,\Msun$. We also present a much improved measurement of the rate of periastron advance for PSR B2303+46: $\dot\omega = 0\fdg0099\pm0\fdg0002\,\mbox{yr}^{-1}$, implying $M=2.53\pm0.08\,\Msun$ for this system. We discuss the available constraints on distribution of mass between the pulsars and their companions, and we compare the pulsar masses with other determinations of neutron star masses.

73 citations


Journal ArticleDOI
TL;DR: In this article, a novel multiple-cavity erbium-doped fiber laser with simultaneous dual single-frequency lasing is presented. Butler et al. achieved a 16-kHz linewidth and a frequency separation of 59 GHz with a stability of better than 3 MHz in this dual-frequency laser.
Abstract: Narrow-linewidth erbium-doped fiber lasers of monolithic multiple linear cavity configurations that use intracore fiber grating reflectors are demonstrated. Robust single-frequency operation of a miniature coupled-cavity fiber laser with a linewidth of 30 kHz is reported. A novel multiple-cavity erbium fiber laser with simultaneous dual single-frequency lasing is also demonstrated. A 16-kHz linewidth and a frequency separation of 59 GHz with a stability of better than 3 MHz were achieved in this dual-frequency laser.

69 citations


Journal ArticleDOI
TL;DR: A cw room-temperature Cr(4+):YAG laser, tuning from 1.37 to 1.51 microm, is described and mode locking of this novel laser is reported for what is to the authors' knowledge the first time.
Abstract: A cw room-temperature Cr4+:YAG laser, tuning from 1.37 to 1.51 μm, is described. Mode locking of this novel laser is reported for what is to our knowledge the first time.

66 citations


Journal ArticleDOI
TL;DR: In this article, a 59.1 GHz train of 2.2 ps solitons with low phase noise was generated by a novel, passive, all optical fiber source, based on transformation of a dual frequency beat signal generated by 16 kHz line width erbium fiber DBR laser having a selectable and highly stable frequency separation, into a soliton train in a comblike dispersion profiled fiber, a novel fibre design which uses conventional optical fibres.
Abstract: A 59.1 GHz train of 2.2 ps solitons with low phase noise (<5×10−5) is generated by a novel, passive, all optical fibre source. The technique is based on transformation of a dual frequency beat signal generated by a 16 kHz line width erbium fibre DBR laser having a selectable and highly stable frequency separation, into a soliton train in a comblike dispersion profiled fibre, a novel fibre design which uses conventional optical fibres.

60 citations


Journal ArticleDOI
TL;DR: In this paper, a femtosecond soliton through a potential barrier-like spectral inhomogeneity of group velocity dispersion (GVD), including the forbidden band of positive GVD, is predicted.
Abstract: A soliton spectral tunnelling effect (SSTE) is predicted. This is characterised in the spectral domain by the passage of a femtosecond soliton through a potential barrier-like spectral inhomogeneity of group velocity dispersion (GVD), including the forbidden band of positive GVD.

Journal ArticleDOI
TL;DR: A diode-pumped mode-locked Cr:LiSAF laser is demonstrated for what is to the authors' knowledge the first time, and active mode locking and resonant passive mode locking have both yielded cw trains of picosecond pulses.
Abstract: A diode-pumped mode-locked Cr:LiSAF laser is demonstrated for what is to our knowledge the first time. Active mode locking, with an acousto-optic modulator, and resonant passive mode locking, with a multiple-quantum-well absorber in an external cavity, have both yielded cw trains of picosecond pulses.

Journal ArticleDOI
01 Sep 1993-Nature
TL;DR: In this paper, the y-dxis should be labelled as Photons (cm2 s MeV) and not Photons(cm 2 s GeV) as published.
Abstract: Nature 359, 615-616 (1992)IN Fig. 2 of this letter, the y-'dxis should be labelled as Photons (cm2 s MeV) ' and not Photons (cm2 s GeV) ' as published.

Journal ArticleDOI
TL;DR: Hybrid systems are defined as systems that exhibit mixed properties of continuous-time systems that combine the properties of discrete and continuous time systems.

Proceedings ArticleDOI
15 Dec 1993
TL;DR: A novel algorithm using constrained differential dynamic programming to solve the optimal control problem using gradient-based numerical optimization algorithms is proposed.
Abstract: We consider optimal control design for systems that involve continuous and discrete states. The discontinuous nature of such a system results in the inconsistency of the derivatives of the objective function used by gradient-based numerical optimization algorithms. To avoid this difficulty, we propose a novel algorithm using constrained differential dynamic programming to solve the optimal control problem. >

Journal ArticleDOI
TL;DR: In this paper, a diode-pumped Cr: LiSAF laser has been modelocked using a multiquantum well absorber in an external cavity to yield CW trains of picosecond pulses.
Abstract: A diode-pumped Cr: LiSAF laser has been modelocked for the first time using a multiquantum well absorber in an external cavity to yield CW trains of picosecond pulses.

Journal ArticleDOI
TL;DR: A Cr:LiSrAIF(6) laser has been mode locked by using a multiple-quantum-well (MQW) absorber, yielding transform-limited pulses as short as 93 fs.
Abstract: A Cr:LiSrAIF6 laser has been mode locked by using a multiple-quantum-well (MQW) absorber. With the MQW absorber inside the laser cavity, Kerr lens mode locking is initiated, yielding transform-limited pulses as short as 93 fs. Pulses of 500-fs duration have also been produced by using resonant passive mode locking with the MQW absorber in an external cavity.

Journal ArticleDOI
TL;DR: The occurrence of cocaine-sensitive dopamine uptake in all examined regions and its equal sensitivity to cocaine and GBR 12909 is consistent with the involvement of nucleus accumbens and/or prefrontal cortex in the reinforcing effects of cocaine.

Journal ArticleDOI
TL;DR: In this article, the application of fiber grating reflectors, holographically written in optical fiber, for dual frequency operation of integrated erbium fiber lasers is demonstrated, and a tunable, narrow bandwidth dual-frequency laser action is reported.
Abstract: The application of fibre grating reflectors, holographically written in optical fibre for dual frequency operation of integrated erbium fibre lasers is demonstrated. Tunable, narrow bandwidth dual-frequency laser action is reported.

Journal ArticleDOI
TL;DR: In this article, a diode-pumped ytterbium-erbium "figure of eight" laser is stabilised by the inclusion of a bandwidth-limiting element inside the cavity.
Abstract: A diode-pumped ytterbium-erbium ‘figure of eight’ laser is stabilised by the inclusion of a bandwidth-limiting element inside the cavity. Transform limited solitons with durations of l.35ps are generated, continuously tunable over 20nm. Temporal stabilisation is imposed through amplified feedback of light reflected by the nonlinear loop mirror.

Proceedings Article
02 May 1993
TL;DR: In this paper, a novel technique for the generation of a high repetition rate train of transform-limited pulses is demonstrated, and a 32 GHz train of 4.2 ps pulses has been generated.
Abstract: A novel technique for the generation of a high repetition rate train of transform-limited pulses is demonstrated. A 32 GHz train of 4.2 ps pulses has been generated. >

Journal ArticleDOI
TL;DR: In this paper, a novel technique for the generation of a high repetition rate train of transform-limited pulses is demonstrated, and a 32 GHz train of 4.2 ps pulses has been generated.
Abstract: A novel technique for the generation of a high repetition rate train of transform-limited pulses is demonstrated. A 32 GHz train of 4.2 ps pulses has been generated.

Proceedings ArticleDOI
James Taylor1, Jin Lu1
02 Jun 1993
TL;DR: In this paper, the authors describe a robust control system for a gun turret testbed called the ATB1000, which incorporates a control scheme based on sinusoidal-input describing function (SIDF) models of the testbed's drive subsystem to reduce the effects of backlash and nonlinear friction.
Abstract: This paper describes the design of a robust control system for a gun turret testbed called the ATB1000. The control system incorporates a control scheme based on sinusoidal-input describing function (SIDF) models of the testbed's drive subsystem to reduce the effects of backlash and nonlinear friction, and a dissipative control scheme to make the control system insensitive to the unmodeled dynamics and parameter imprecision associated with the flexible modes of the wheel/barrel subsystem.

Proceedings ArticleDOI
James Taylor1
15 Dec 1993
TL;DR: The development of a standard hybrid systems modeling language (SHSML) and corresponding rigorous simulation environments represent important contributions to fulfilling this requirement for efficient and cost-effective development of embedded real-time software.
Abstract: A rigorous means for modeling and evaluating hybrid systems is needed for the efficient and cost-effective development of embedded real-time software for a wide variety of applications (weapons, manufacturing, intelligent vehicles, process control). The development of a standard hybrid systems modeling language (SHSML) and corresponding rigorous simulation environments represent important contributions to fulfilling this requirement. >

Journal ArticleDOI
TL;DR: In this article, a titanium-doped sapphire laser has been modelocked using an intracavity multiquantum well absorber, and stable transform-limited pulses as short as 130 fs have been generated.
Abstract: A titanium-doped sapphire laser has been modelocked using an intracavity multiquantum well absorber. Stable transform-limited pulses as short as 130 fs have been generated.

Journal ArticleDOI
TL;DR: In this article, stable trains of pulses as short as 2ps have been generated from an ytterbium-erbium fiber loop laser modelocked through synchronous pumping by the 100ps, 100MHz repetition rate pulses of an actively modelocked Nd:YAG laser.
Abstract: Stable trains of pulses as short as 2ps have been generated from an ytterbium-erbium fibre loop laser modelocked through synchronous pumping by the 100ps, 100MHz repetition rate pulses of an actively modelocked Nd:YAG laser. Crossphase modulation and soliton shaping are the dominant pulse formation and shaping mechanisms.

Proceedings ArticleDOI
James Taylor1, Jin Lu1
02 Jun 1993
TL;DR: A second-generation toolset for computer-aided nonlinear control system analysis and design based on sinusoidal-input describing function (SIDF) methods that can treat very general nonlinear systems, with no restrictions as to system order, number of nonlinearities, configuration, or nonlinearity type is described.
Abstract: We describe a second-generation toolset for computer-aided nonlinear control system analysis and design based on sinusoidal-input describing function (SIDF) methods. There are two main elements in our CAD software: a simulation-based program for generating amplitude-dependent SIDF input/output models for nonlinear plants, and a frequency-domain nonlinear compensator design package. Both of these are described in detail. This software can treat very general nonlinear systems, with no restrictions as to system order, number of nonlinearities, configuration, or nonlinearity type. An overview of the application of this software to the ATB1000 Army test facility (comprising an electromechanical pointing system with flexible modes) will be provided, to illustrate the use and efficacy of these tools.

Journal ArticleDOI
TL;DR: Software for EDBM should be designed as an integral part of a CACE environment and features that improve CACE productivity will be proposed and described.

01 Jan 1993
TL;DR: Hybrid systems are defined as systems that exhibit mixed properties of continuous-time systems as mentioned in this paper, and hybrid systems can be defined as a mixture of continuous time and continuous time systems.
Abstract: Hybrid systems are defined as systems that exhibit mixed properties of continuous-time systems.

Journal ArticleDOI
TL;DR: In this paper, the behavior of a diode pumped figure-of-eight ytterbium/erbium-doped fiber laser which generates sub-picosecond pulses is described.
Abstract: The behaviour of a diode pumped figure-of-eight ytterbium/erbium-doped fibre laser which generates subpicosecond pulses is described. This laser is observed to mode-lock simultaneously in two orthogonal polarisation states with distinct temporal and spectral characteristics.