1. Amphibians are recognized both for their sensitivity to environmental perturbations and for their usefulness as cost-effective biometrics of ecosystem integrity (=system health). 2. Twenty-three years of research in headwater streams in the Klamath-Siskiyou and North Coast Bioregions of the Pacific Northwest, U.S.A., showed distinct patterns in the distribution of amphibians to variations in...

Abstract The unipole logging while drilling (LWD) tool is a recently developed acoustic that uses an azimuthal emitting source to generate waves in the borehole measure longitudinal and transverse wave speeds of surrounding stratum. In this study, transmitter transducer modeled as surface force source, analytical solution for LWD wavefield derived. received waveforms are composed infinite-order...

Mastering real-time and accurate downhole information is crucial for ensuring drilling safety, improving efficiency, maximizing economic benefits. In recent years, logging while (LWD) technologies, represented by mud pulse telemetry (MPT), achieved significant success. However, they still face challenges such as a large amount of conflicting with low transmission rates, severe channel distortio...

A double-negative feedback loop formed by the morning genes CIRCADIAN CLOCK ASSOCIATED1 (CCA1)/LATE ELONGATED HYPOCOTYL (LHY) and the evening gene TIMING OF CAB EXPRESSION1 (TOC1) contributes to regulation of the circadian clock in Arabidopsis. A 24-h circadian cycle starts with the peak expression of CCA1 at dawn. Although CCA1 is targeted by multiple transcriptional repressors, including PSEU...

PURPOSE To investigate, in patients with Parkinson's disease (PD), the coping strategies; the most reported vocal symptoms; and the relation between coping, voice symptoms, and communicative aspects. METHODS Seventy-three subjects were included in the sample, 33 of which were participants in the experimental group (EG) with diagnosis of PD and 40 were control subjects, that is, healthy and wi...

A technique for estimating the dispersion characteristics of propagating waves as measured by an array is detailed. The technique consists of bandpass filtering the data through a filterbank and then processing the filtered waveforms non-dispersively. The results can show the dispersion of the entire time series or be parsed in time to analyze the dispersion characteristics of any section of th...

Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. ABSTRACT During logging-while-drilling (LWD) operations, complex drill string movements and the weight of the drill...

Highway consultants need pavement structure strength to examine and design. With advances in computer, sensor, microelectronic technologies, the light weight deflectometer (LWD) can measure granular asphalt layers. This portable, easy-to-use tool is suggested. article was designed improve LWD Pusjatan's accuracy distinguish it from other testing methods. study compares Pusjatan UMMATA (Universa...