The generation of gravitational waves. 2: The post-linear formalism revisited

Two different versions of the Green's function for the scalar wave equation in weakly curved spacetime (one due to DeWitt and DeWitt, the other to Thorne and Kovacs) are compared and contrasted; and their mathematical equivalence is demonstrated. The DeWitt-DeWitt Green's function is used to construct several alternative versions of the Thorne-Kovacs post-linear formalism for gravitational-wave generation. Finally it is shown that, in calculations of gravitational bremsstrahlung radiation, some of our versions of the post-linear formalism allow one to treat the interacting bodies as point masses, while others do not

Pressure Distribution on the C-7 Airship

This investigation was made for the purpose of determining the aerodynamic pressure distribution encountered on a "C" class airship in flight. It was conducted in two parts: (a) tests on the tail surfaces in which the pressures at 201 points were measured and (b) tests on the envelope in which 190 points were used, both tests being made under as nearly identical flight conditions as possible, so that the results could be combined and the pressure distribution over the entire airship obtained

Ambient Intelligence through Image Retrieval

An ambient intelligent environment needs dynamic enrollment of strangers without too much human intervention. For this purpose, we propose an entity recognition process based on images captured with low-cost but widespread webcams and easy-to-deploy image processing techniques. We find that the use of levels of confidence in recognition due to different techniques and context-based image retrieval improves the process

High-Precision U-Pb CA-TIMS Calibration of Middle Permian to Lower Triassic Sequences, Mass Extinction and Extreme Climate-Change in Eastern Australian Gondwana

Twenty-eight new high-precision Chemical Abrasion Isotope Dilution Thermal Ionisation Mass Spectrometry U-Pb zircon dates for tuffs in the Sydney and Bowen Basins are reported. Based on these new dates, the Guadalupian-Lopingian/Capitanian-Wuchiapingian boundary is tentatively placed at the level of the Thirroul Sandstone in the lower part of the Illawarra Coal Measures in the Sydney Basin. The Wuchiapingian-Changhsingian boundary is at or close to the Kembla Sandstone horizon in the Illawarra Coal Measures, southern Sydney Basin, in the middle part of the Newcastle Coal Measures in the northern Sydney Basin, and in the middle of the Black Alley Shale in the southern Bowen Basin. The end-Permian mass extinction is recognised at the base of the Coal Cliff Sandstone in the southern Sydney Basin, at the top of the Newcastle Coal Measures in the northern Sydney Basin, and close to the base of the Rewan Group in the Bowen Basin and is dated at c. 252.2 Ma. The end-Permian mass extinction is interpreted to be synchronous globally in both marine and terrestrial environments, and in high and low latitudes (resolution \u3c 0.5 my). The GSSP-defined Permian-Triassic boundary is interpreted to be approximately at the level of the Scarborough Sandstone in the lower Narrabeen Group, Sydney Basin, and in the lower Rewan Group, Bowen Basin. New dates presented here suggest that the P3 and P4 glacial episodes in the Permian of eastern Australia are early Roadian to early Capitanian, and late Capitanian to mid Wuchiapingian in age respectively. The greenhouse crisis in the uppermost Pebbly Beach and Rowan Formations of the Sydney Basin is interpreted as early mid Roadian, a mid-Capitanian age for the crisis at the base of the Illawarra/Whittingham Coal Measures is confirmed. Greenhouse crises in the upper Illawarra/Newcastle Coal Measures and lower Narrabeen Group of the Sydney Basin are dated as upper Changhsingian-Induan, and in the upper Narrabeen Group/lower Hawksbury Sandstone as upper Olenekian

A molecular-MNIST dataset for machine learning study on diffraction imaging and microscopy

An image dataset of 10 different size molecules, where each molecule has 2,000 structural variants, is generated from the 2D cross-sectional projection of Molecular Dynamics trajectories. The purpose of this dataset is to provide a benchmark dataset for the increasing need of machine learning, deep learning and image processing on the study of scattering, imaging and microscopy

Implementing the UN Action Programme for Combating the Illicit Trafficking in Small Arms and Light Weapons in All Its Aspects.

yesHistorically, UN conferences have been criticised for resulting more in compromises than in commitments to real change, which is also a charge that has been levelled against the UN Conference on the Illicit Trade in Small Arms and Light Weapons in All Its Aspects (UN Small Arms Conference). The consensus-based approach adopted throughout the negotiations had the advantage of binding all participating States to all aspects of the agreed Programme of Action (PoA), but it also ensured that it would be difficult to achieve a sufficiently rigorous and comprehensive agreement on all of the measures required to tackle the trafficking, proliferation and misuse of small arms and light weapons (SALW). Therefore, in spite of the efforts of many governments and NGOs, the UN Small Arms Conference did not agree sufficiently robust agreements in several areas. Nonetheless, it was a valuable and productive process. The resulting PoA includes a reasonably comprehensive set of key principles and commitments, which provide a basis for taking forward action at national, regional and global levels. The PoAwas agreed by all of the participating States, amounting to more than 100, and each are politically bound to adopt and implement it. Given that the UN Small Arms Conference was the first of its kind, its achievement in generating political will and momentum for efforts to control SALW is important. Although many of the commitments are weaker and less comprehensive than hoped for by many governments and organisations, it is significant that the PoAcontains at least some important commitments in all but two of the `core¿ issue areas raised by States. The two exceptions relate to transfers to non-State actors and to civilian trade, possession and use of SALW, restrictions which were strongly opposed by the USA. Equally, human rights related issues were noteworthy by their absence in the PoA. Whilst the process of reaching agreement began with a far-reaching draft PoA in December 2000 (A/Conf.192/L.4), most of the comments that were tabled on this text during the second Preparatory Committee in January 2001 came from countries that sought to weaken its commitments. The subsequent draft (A/Conf.192/L.4/Rev.1) was therefore weaker, with the result that progressive States faced an uphill task in seeking to strengthen its provisions. The next draft PoA emerged at the UN Small Arms Conference itself in the form of a third draft (A/Conf.192/L.5). Although still limited in a number of key areas ¿ such as export criteria and transparency ¿ this document went further than L.4/Rev.1 in a number of respects and included specific international commitments, including on brokering and tracing lines of supply. This, however, proved too ambitious an agenda for a small group of States and in the end the document that was adopted by consensus (A/Conf.192/L.5/Rev.1) represented a lower-level compromise. Despite the difficulties of agreeing the consensus-based PoA, the process culminating in the agreement was perhaps as important as the agreement itself. UN Small Arms Conference represented the first time that all UN Member States had met to discuss the illicit trade in SALW in all its aspects with a view to agreeing a comprehensive set of measures to address the problem. Although many of the commitments contained in the PoAare couched in equivocal language that will allow States to do as much or as little as they like, it is clear that the UN Small Arms Conference has contributed to a much better understanding, amongst all stakeholders, of the nature of the illicit trade in SALW and of the particular concerns and priorities of different countries and sub-regions. It is also clear that although the Programme of Action provides a set of minimum standards and commitments which all states should adopt, it also encourages further action from all States willing to adopt more stringent commitments and stronger programmes. There is a willingness among a number of States to build upon the PoAand take more concrete and far-reaching measures at national, sub-regional, regional and international levels, such as specific arrangements for tracing co-operation, or mechanisms to co-ordinate e fforts to improve stockpile security or weapons destruction. This briefing provides a critical assessment of key provisions in the UN Small Arms Conference PoA. Section 1 measures the overall outcomes of the conference against those that the Biting the Bullet (BtB) project proposed as optimal conclusions, and suggests ways to put the commitments contained in the PoA into practice. Section 2 assesses the implementation and follow-up commitments contained in the PoA, and identifies ways of promoting the implementation of Sections III and IV, as well as options for making the most of the Biennial Meetings of States and the Review Conference in 2006. Section 3 examines funding and resourcing possibilities for the PoA including identifying needs, mobilising resources and matching needs with resources. The final section of the briefing focuses on the way forward, and in particular on how implementation of the PoA could build on existing regional initiatives and develop common international approaches to controlling SALW proliferation, availability and misuse. It also examines how action to prevent and combat the illicit trade in SALW in all its aspects can be taken forward at sub-regional and regional levels in conjunction with all major stakeholders, including civil society, in the period leading up to the first Review Conference

Early Permian Zircon Ages from the \u3cem\u3eP. confluens\u3c/em\u3e and \u3cem\u3eP. pseudoreticulata\u3c/em\u3e Spore-Pollen Zones in the Southern Bonaparte and Canning Basins, Northwestern Australia

The Pseudoreticulatispora confluens–P. pseudoreticulata spore-pollen zonal datum typically coincides with the end of widespread Permian glacial deposits in Western Australia. Although previously attributed to the mid-Sakmarian, chemical abrasion isotope dilution thermal ionisation mass spectrometry (TIMS) dating of zircons from volcanic tuffs in the Ditji Formation of the Bonaparte Basin and the Grant Group in the Canning Basin point to an Asselian age of about 295.25 Ma for this datum. All dated zircons from the Ditji Formation came from petroleum well cuttings but the accompanying palynology was mostly from sidewall cores; however, all Grant Group samples were from conventional core. TIMS dates from the Ditji Formation range in age from 295.2 to 292.7 Ma whereas the only productive tuff from the Grant Group yielded a 296.26 Ma date. By comparison, there are no zircon dates to constrain the onset of glacial deposition in Australia. The Bonaparte Basin ages overlap with those for the Edie Tuff (296.1–294.5 Ma) in Queensland’s Galilee Basin, approximately 2000 km to the southeast, which also lies close to the base of the P. pseudoreticulata Zone. To date the only fossil group within the P. confluens Zone in Western Australia to provide independent age control, albeit loosely, are goniatites from the northern Perth Basin (Uraloceras irwinense and Juresanites jacksoni) that have consistently been attributed to the Sakmarian; these require a reassessment of their affinity with Russian faunas and therefore to global stratotypes. The position of the Carboniferous–Permian boundary is elusive in Australia and will remain so until additional volcanic tuffs containing young datable zircons are found; however, spore-pollen and zircon dates from Namibia place this boundary within the P. confluens Zone

Enhancing breadth of knowledge within multidisciplinary doctoral research: reflections from the Cambridge Generic Nutrition Training course for non-nutritionist postgraduates and professionals

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The Detection of Unsteady Flow Separation with Bioinspired Hair-Cell Sensors

Biologists hypothesize that thousands of micro-scale hairs found on bat wings function as a network of air-flow sensors as part of a biological feedback flow control loop. In this work, we investigate hair-cell sensors as a means of detecting flow features in an unsteady separating flow over a cylinder. Individual hair-cell sensors were modeled using an Euler-Bernoulli beam equation forced by the fluid flow. When multiple sensor simulations are combined into an array of hair-cells, the response is shown to detect the onset and span of flow reversal, the upstream movement of the point of zero wall shear-stress, and the formation and growth of eddies near the wall of a cylinder. A linear algebraic hair-cell model, written as a function of the flow velocity, is also derived and shown to capture the same features as the hair-cell array simulatio