An approach to a field drainage problem by laboratory examination of selected properties of undisturbed soil cores : thesis presented at Massey University of Manawatu in part fulfilment of the requirements for the degree of Master of Agricutural Science

For many years, soil drainage investigators, from a practical view point, have had to content themselves with expert appraisal of certain direct and indirect soil and environmental characteristics in order to ascertain the cause of a particular drainage problem. In a great many instances, observations of vegetative composition, topography and general soil type, aided by aerial photography and local experience, give completely adequate information. Normally, derivation of conclusions from such observations is based on well established principles, and the recognition of general broad classes of the cause of mal-drainage conditions. Such classes may be grouped as; (I) where infiltration capacity of a soil is inadequate to deal with the amount of water supplied to the surface, because of topography, abnormal rainfall, or through inherent inability of the soil to transmit water internally, (II) where the groundwater table rises to a height detrimental to vegetative survival and/or soil structure, or where its presence hinders the function of a free draining subsoil, end (III) where a similar situation exists, due to a perched or elevated ground-water table. The allocation of a particular drainage problem to one or more of these broad classes is not usually difficult, but identification of causal processes within classes presents quite another problem. Often, drainage investigators have been content to evolve general treatments for each class, and, as a basic rule, such procedures have, more often than not, proved reasonably effective. However, with the increasing intensification of pastoral and agricultural farming, the fundamental causes of individual mal-drainage conditions must be positively identified and rectified within the broadly classified groups

A failure diagnosis and impact assessment prototype for Space Station Freedom

NASA is investigating the use of advanced automation to enhance crew productivity for Space Station Freedom in numerous areas, one being failure management. A prototype is described that diagnoses failure sources and assesses the future impacts of those failures on other Freedom entities

Housing in Crisis--A Call to Reform Massachusetts\u27s Affordable Housing Law

The debate over how to properly foster and maintain affordable housing has remained a longstanding, contentious issue in Massachusetts government. For the past thirty years, this debate has crystallized and regularly centered on Chapter 40B, Massachusetts’s affordable housing law. Recent executive, legislative, and private proposals, coupled with extraordinary increases in housing costs, have resulted in growing concerns over the effectiveness of 40B and the correct method, if any, of fixing its deficiencies. This Note examines these proposals as well as affordable housing efforts in other parts of the country and argues that Massachusetts’s affordable housing crisis will only be solved if the State legislature replaces 40B’s arbitrary housing quotas with new initiatives that create enough housing to meet demand and new incentives that encourage municipalities and the private sector to join in its efforts

Program Evaluation of Child Advocacy Centers in West Virginia

In West Virginia, the law mandates a multidisciplinary team (MDIT) approach, (involving the collaboration of legal, social work, and other professionals), in dealing with child abuse. West Virginia code also mandates a periodical case review, requiring the MDIT members to review all open investigations of child abuse. In some counties, the MDIT includes a Child Advocacy Center (CAC). The CAC has three broad goals, which are (a) to make the process of reporting child abuse as easy and free of trauma as possible for the child, (b) to help coordinate the investigation, and (c) to be a strong support and resource center for the child and his family throughout and subsequent to the investigation. Professionals involved in child abuse cases in counties with a CAC find the CAC model beneficial and preferable compared to child abuse cases before there were CAC programs

Thermodynamic and transport properties of simple ionic melts

Imperial Users onl

Injection locking of an electro-optomechanical device

The techniques of cavity optomechanics have enabled significant achievements in precision sensing, including the detection of gravitational waves and the cooling of mechanical systems to their quantum ground state. Recently, the inherent non-linearity in the optomechanical interaction has been harnessed to explore synchronization effects, including the spontaneous locking of an oscillator to a reference injection signal delivered via the optical field. Here, we present the first demonstration of a radiation-pressure driven optomechanical system locking to an inertial drive, with actuation provided by an integrated electrical interface. We use the injection signal to suppress drift in the optomechanical oscillation frequency, strongly reducing phase noise by over 55 dBc/Hz at 2 Hz offset. We further employ the injection tone to tune the oscillation frequency by more than 2 million times its narrowed linewidth. In addition, we uncover previously unreported synchronization dynamics, enabled by the independence of the inertial drive from the optical drive field. Finally, we show that our approach may enable control of the optomechanical gain competition between different mechanical modes of a single resonator. The electrical interface allows enhanced scalability for future applications involving arrays of injection-locked precision sensors.Comment: Main text: 10 pages, 7 figures. Supplementary Information: 5 pages, 4 figure