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The Pacific Treefrog (Pseudacris regilla) is commonly encountered throughout the Pacific Northwest and can be an indicator for ecosystem health. At each life stage P. regilla utilizes a different habitat and therefore it is important to understand habitat use at all life stages to properly manage the ecosystem, however, few studies have been conducted on the juvenile form. To determine juvenile P. regilla riparian habitat use, and thus create appropriate habitat management plans, field work must be conducted. Transect surveys were conducted at two highly disturbed ephemeral ponds with a variety of open and dense vegetative riparian habitats in the Willamette Valley, Oregon. P. regilla was found in the highest abundance in habitat shaded by a thin border of Oregon Ash around the pond perimeter, and was composed mainly of Himalayan black...
Incremental ADCs (IADCs) have many advantages for low-frequency high-accuracy data conversion—they are easy to multiplex between channels, need simpler digital decimation filter, and allow extended counting with a Nyquist-rate ADC. A single-loop incremental ADC was designed and fabricated in 90 nm for a biosensor interface circuit. It incorporates one integrator, and uses noise-coupling technique to achieve second-order noise-shaping. The use of feed-forward coupling and multi-bit internal quantizer allows low swing at the integrator, and hence low-power operation. The measured SNR is 74 dB within a signal bandwidth 2 kHz, and a 14 μW power consumption. A new two-step IADC was proposed for 250 Hz bandwidth sensor interface circuits. It extends the order of a conventional incremental ADC from N to (2N-1) by way of a two-step operation. ...
Forest measurement and biometrics (FMB) programs have been at the heart of forestry education in North America since its beginnings at the Biltmore Forest School more than 100 years ago. Over the intervening period, the field of forestry has changed in critical ways. There are many forest management and policy issues that, at first glance, do not appear to involve FMB but which, on further examination, are found to be closely linked. In this regard, FMB has both an “inside” and “outside.” The outside part faces interactions with its clients and front-line sciences (e.g., forest ecology, silviculture, etc.) which bring new data-analytic ideas to FMB. The clients and professionals in these allied sciences need solutions to pressing quantitative questions. The inside face relates to the need to extend the structure of statistical inferenc...
Recent national and state legislation reflect a
growing awareness of the need for comprehensive cultural
resource management programs. Various pieces of federal
legislation and Oregon's Senate Bill 100 demonstrate a
willingness of governments to provide for such programs.
The administration of local land use issues at the state
government level has created much controversy in Oregon
within the last decade. Controversy was brought to a
climax with the enactment of Senate Bill 100.
Senate Bill 100 created the Land Conservation and
Development Commission (LCDC) in 1973 and gave the Commission authority to establish planning goals and guidelines to be used by local governments in the comprehensive
planning process. Goal 5 requires the local planning
departments to inventory various resources of the state,
including historic ar...
This report is one of a series issued in cooperation with the Air Force-Navy-Civil Subcommittee on aircraft design criteria under the supervision of the Aircraft Committee of the Munitions Board.
In recent years, there has been growing interest in both industry and academia to use continuous-time (CT) Δ-Σ A/D converters for wideband wireless and wireline communication applications.
So far no reported CT Δ-Σ A/D modulator achieves 14-bit or higher dynamic range (DR) with more than 2MHz signal bandwidth (equivalently 4MS/s). This dissertation presents the realization of a continuous-time (CT) Δ-Σ A/D modulator providing 80.5dB SNDR and 85dB DR with 5MS/s output data rate in a 2.5V 0.25µm CMOS process. The modulator has a single-stage dual-loop architecture allowing large quantizer delay. A 17-level quantizer is used to increase resolution and non-return-to-zero DACs are adopted to reduce clock jitter sensitivity. Capacitor tuning is utilized to overcome time-constant variation. On-chip self-calibration is implemented to suppr...
This report is one of a series issued in cooperation with the Army-Navy-Civil Committee on aircraft design criteria under the supervision of the Aeronautical Board. Information reviewed and reaffirmed July 1955.
