The preparation of certain inorganic and organic compounds which may be of use in mineralogical separations

In the work with minerals, there has been many mechanical means devised whereby the ores could be separated from the gangue and other material. Among those means which are used to-day, especially in the laboratory tests upon minerals, to quickly determine the value of an ore, heavy liquids have become quite popular. This means of mechanical separation is merely to place finely ground ore containing particles of varying density into a liquid of heavier density than the greater portion of the mineral, which will allow the heavier portions to sink and the lighter to float, which is usually gangue. This process is known as the sink-and-float method of separation. The purpose of this work was to increase, if possible, the specific gravity of some of the heavy liquids already in use, and prepare other compounds which may be soluble, or to devise some new method of preparing such a compound for this purpose, so that a greater concentration of ores could be made --Introduction, page 2

A biblical approach to poverty alleviation : a case study of Pinelands Methodist Church, phambili ngeThemba's community building efforts through job creation in Langa township

The purpose of this research project was to determine an appropriate intervention to assist in bringing transformation to the poverty-stricken community of Langa, Cape Town, South Africa. Intense poverty is a fact of life for almost 3 billion people in the world, a figure which includes approximately 50 per cent of the South African population. The Bible gives clear instruction mandating care for ‘the poor’. Therefore, those claiming to follow the teaching of Scripture must make poverty alleviation a priority. Phambili ngeThemba began as an intervention in the Langa Township community to discover ways to engage with issues around poverty. Research facilitated by Learn to Earn, a non-profit organization offering skills training and job creation, was done to understand if individual and community development was necessary and, if so, how it could be structured as a method to alleviate poverty in the Langa Community. Both quantitative and qualitative research was undertaken. Through random proportionate sampling in a thorough needs analysis of the businesses in and around Langa, the ideal character qualities desired by local business for the workforce were elicited. These were traits that could be developed in unemployed people. Use of basic questionnaires and oral feedback by three selected focus groups comprised of Langa residents enabled evaluation of local human service resources and identification of the felt needs in the community. The Priority Index (P-Index) research technique distinguished between the actual needs of the community and their perceived needs or wants. The results became the training foundation for the Zanokhanyo Training and Resource Centre, providing holistic development for the unemployed to equip them for placement in the workforce. CopyrightDissertation (MA(Theol))--University of Pretoria, 2010.Practical Theologyunrestricte

Executive deficits detected in mild Alzheimer's disease using the antisaccade task

The antisaccade task, a hands- and language-free metric, may provide a functional index of the dorsolateral prefrontal cortex (DLPFC), a region damaged in the later stages of Alzheimer's disease (AD). Our objective was to determine if patients with mild AD made more errors relative to age-matched controls. Thirty patients with mild AD (Mini Mental Status Exam [MMSE] ≥ 17) and 31 age-matched controls completed a laptop version of the prosaccades and antisaccades tasks. Patients with AD made more antisaccade errors, and corrected fewer errors, than age-matched controls. Error rates, corrected or uncorrected, were not correlated with AD MMSE or Dementia Rating Scale scores. Our findings indicate that antisaccade impairments exist in mild AD, suggesting clinically detectable DLPFC pathology may be present earlier than suggested by previous studies

The gospel as social revolution

History is replete with examples illustrating the impact that evangelicals have had upon society. A recent publication by sociologist Robert Woodberry identifies the work of missionaries as ‘the single largest factor in insuring the health of the nations.’ 2 This article will trace the social impact of the gospel through the efforts of these ‘Conversionary Protestants’. It will also measure the South African social climate 20 years into democracy by detailing the serious issues that exist in our local communities. South African missiologist David Bosch3 wrote, ‘Never before in history has people’s social distress been as extensive as it is in the twentieth century. However, never before have Christians been in a better position than they are today to do something about this need.’ The evangelical church has a clear mandate to bring about needed social revolution. How will this happen? A church-based model for community engagement as a movement of the gospel will be examined to guide discussion.http://www.ctbs.org.za/sa-baptist-journal-of-theology/am201

A New Testament approach to poverty alleviation as a social centered model for evangelism

The church has always indicated a desire to bring about spiritual transformation, finding this mandate as a response to the Great Commission voiced by Jesus as he returned to his Father: “Go therefore and make disciples of all nations ...” (Matthew 28:19a). It is possible that the spiritual transformation so desired by the Church will only come in the measure that the Church responds to the clear Biblical mandate to engage with the desperate needs of the poor

Sinawe’ [we are with you] : local churches as change agents in the lives of traumatised youth

The church has a key role to play in addressing the chronic levels of grief and trauma experienced by the youth in South Africa. It has a biblical mandate to bring hope and healing and has a unique station within South African society that positions it to bring about real transformation. ‘Sinawe’ (Zulu for [we are with you]) is a programme developed by Scripture Union South Africa to equip local churches as change agents through a relational youth ministry model that engages trauma, grief and holistic needs, both physically and spiritually. This is an important first step for churches wanting to reach and minister to young people. The South African church has an important and legitimate role to play in the lives of young people. Research indicates that although the church is considered by local residents as an important community resource, it remains ineffectual in intentional community-based youth ministry that leverages significant opportunity. This research identifies the church as an important community change agent and encourages church leaders to step into the open gap to reach local young people while providing the methodology with which to do so. This research paper examines the current South African social context, outlines a theological mandate for church involvement and presents a methodology for a supportive and effective approach to community engagement in the lives of young people led by local churches. INTERDISCIPLINARY : The article is relevant to the following disciplines within theology; missiology, family and youth ministry and pastoral care. It also has interfaces with education and sociology.http://www.ve.org.zaPractical Theolog

Direct Observation of Broadband Coating Thermal Noise in a Suspended Interferometer

We have directly observed broadband thermal noise in silica/tantala coatings in a high-sensitivity Fabry-Perot interferometer. Our result agrees well with the prediction based on indirect, ring-down measurements of coating mechanical loss, validating that method as a tool for the development of advanced interferometric gravitational-wave detectors.Comment: Final version synchronized with publication in Phys. Lett.

Fiber Optic Temperature Sensors in TPS: Arc Jet Model Design & Testing

Techniques for using fiber optics with Fiber Bragg Gratings (FBGs) have been developed by IFOS Corp. for use in thermal protection systems (TPS) on spacecraft heat shield materials through NASA Phase 1 and 2 SBIR efforts and have been further improved in a recent collaboration between IFOS and NASA that will be described here. Fiber optic temperature sensors offer several potential advantages over traditional thermocouple sensors including a) multiplexing many sensors in a single fiber to increase sensor density in a given array or to provide spatial resolution, b) improved thermal property match between sensor and TPS to reduce heat flow disruption, c) lack of electrical conductivity

Optimal polarization conversion in coupled dimer plasmonic nanoantennas for metasurfaces

We demonstrate that polarization conversion in coupled dimer antennas, used in phase discontinuity metasurfaces, can be tuned by careful design. By controlling the gap width, a strong variation of the coupling strength and polarization conversion is found between capacitively and conductively coupled antennas. A theoretical two-oscillator model is proposed, which shows a universal scaling of the degree of polarization conversion with the energy splitting of the symmetric and antisymmetric modes supported by the antennas. Using single antenna spectroscopy, we find good agreement for the scaling of mode splitting and polarization conversion with gap width over the range from capacitive to conductive coupling. Next to linear polarization conversion, we demonstrate single-antenna linear to circular polarization conversion. Our results provide strategies for phase-discontinuity metasurfaces and ultracompact polarization optics