Design and application of a multi-modal process tomography system

This paper presents a design and application study of an integrated multi-modal system designed to support a range of common modalities: electrical resistance, electrical capacitance and ultrasonic tomography. Such a system is designed for use with complex processes that exhibit behaviour changes over time and space, and thus demand equally diverse sensing modalities. A multi-modal process tomography system able to exploit multiple sensor modes must permit the integration of their data, probably centred upon a composite process model. The paper presents an overview of this approach followed by an overview of the systems engineering and integrated design constraints. These include a range of hardware oriented challenges: the complexity and specificity of the front end electronics for each modality; the need for front end data pre-processing and packing; the need to integrate the data to facilitate data fusion; and finally the features to enable successful fusion and interpretation. A range of software aspects are also reviewed: the need to support differing front-end sensors for each modality in a generic fashion; the need to communicate with front end data pre-processing and packing systems; the need to integrate the data to allow data fusion; and finally to enable successful interpretation. The review of the system concepts is illustrated with an application to the study of a complex multi-component process

Towards implementation of FMCW LiDAR with quadrature modulator architectures in generic InP photonic integration technology

Two architectures with quadrature modulation in a generic InP platform are proposed for realizing frequency-modulated continuous-wave (FMCW) LiDAR. Simulations are used to compare the architectures in terms of tolerance to optical imbalances, insertion loss, chip footprint, and ease of control. The parallel architecture is more resilient to imbalances (~0.82 dB power imbalance for 20 dB ER) than the cascaded architecture (~0.63 dB power imbalance for 20 dB ER)

Project Reach: Implementation of Evidence-Based Psychotherapy Within Integrated Healthcare for Hurricane Harvey Affected Individuals

Project Reach was established to deliver evidence-based mental healthcare services to children and adults affected by Hurricane Harvey and its aftermath. Through Project Reach, an innovative multi-component assessment and treatment service is utilized to identify and treat in integrated healthcare settings both children and adults exhibiting significant behavioral health concerns in Houston. The aim is to provide sustainable, integrated mental health services through primary care and school-based settings to post-Harvey affected individuals whose emotional needs remain unmet. This paper describes the design and implementation of Project Reach as well as special considerations for implementation. The overall goal of Project Reach is to form a platform for expanding integrated services for those affected by Harvey that will maximize behavioral health outcomes while reducing cost and improving access

Demonstration of low RMS differential phase noise across C-band for integrated, amplifying optical phased arrays

We experimentally demonstrate low RMS differential phase noise (<10mrad) across C-band in optical phased array channels integrated with in-line semiconductor optical amplifiers using a generic InP photonic integrated platform without active phase locking

Demonstration of low RMS differential phase noise across C-band for integrated, amplifying optical phased arrays

We experimentally demonstrate low RMS differential phase noise (<10mrad) across C-band in optical phased array channels integrated with in-line semiconductor optical amplifiers using a generic InP photonic integrated platform without active phase locking

Demonstration of low differential phase noise for optical phased arrays with optical amplification

Optical phased arrays (OPAs) are key enablers for light detection and ranging (LiDAR) in autonomous vehicles, free space optical communications, imaging and coherent beam combining. Active OPAs (with amplitude and phase control) allow the control of individual channel gains along with phases for enhanced control of far-field beam pattern. Path length variations and noise from amplifiers degrade the differential phase noise between the OPA channels, which is a key performance indicator that determines the far-field performance in terms of power in the main lobe, extinction of side lobes and pointing error. Conventionally, in fiber-based platforms, multiple phase locked loops are required to reduce the differential phase noise by locking the channels.In this work, we investigate the differential phase noise in an InP active OPA and demonstrate less than 10 mrad differential phase noise corresponding to a stability better than λ/600. To the best of our knowledge, this is the first demonstration of low differential phase noise in an active OPA with amplification in a photonic integrated platform. This result enables on-chip OPA amplification in the InP platform without active locking, thus reducing the system complexity and power consumption

How many locations do we need per day to reliably describe the habitat use of translocated rhinos in Manas NP?

The Indian Rhino Vision (IRV) 2020 program was designed in 2005 in Assam for maintaining existing rhino populations and to re-introduce rhinos in the earlier distribution ranges of Assam. The programme was launched on 12th April 2008. The government of Assam with donor support translocated two male rhinos from the Pobitora WLS to the Buraburijhar area under Basbari range in Manas National Park. As a follow up to these translocations to understand the adaptation of the rhinos, it was important to assess the monitoring frequencies, habitat use and distribution pattern of rhinos in the new habitat. Monitoring was primarily based on radio-telemetry techniques and direct observation. The monitoring team maintains a vigil on the released rhinos all round the day and the observations were systematically recorded three times a day. During this exercise it was found that the rhinos prefer to use grasslands, swamps and marshy areas (beels and rivulet). Key Words: Indian Rhino Vision (IRV) 2020, Radio-Telemetry, Translocatio

Gain without inversion in a biased superlattice

Intersubband transitions in a superlattice under homogeneous electric field is studied within the tight-binding approximation. Since the levels are equi-populated, the non-zero response appears beyond the Born approximation. Calculations are performed in the resonant approximation with scattering processes exactly taken into account. The absorption coefficient is equal zero for the resonant excitation while a negative absorption (gain without inversion) takes place below the resonance. A detectable gain in the THz spectral region is obtained for the low-doped $GaAs$-based superlattice and spectral dependencies are analyzed taking into account the interplay between homogeneous and inhomogeneous mechanisms of broadening.Comment: 6 pages, 4 figure

Checklist of the shore and epipelagic fishes of Tonga

A checklist is given below of 1162 species of shore and epipelagic fishes belonging to 111 families that occur in the islands of Tonga, South Pacifie Ocean; 40 of these are epipelagic species. As might be expected, the fish fauna of Tonga is most similar to those of Samoa and Fiji; at least 658 species of the fishes found in Tonga are also known from Fiji and the islands of Samoa. Twelve species of shore fishes are presently known only from Tonga. Specimens of Tongan fishes are housed mainly in the fish collections of the National Museum ofNatural History, Washington D.C.; Bernice P. Bishop Museum, Honolulu; Museum National d'Histoire Naturelle, Paris; and the Australian Museum, Sydney. Native Tongan names offishes, when known, are presented afterspecies names