Environmental regulation in Indonesia

Since the early 1980s environmental regulation has received high priority in Indonesian policy making. Given Indonesia's dependence upon foreign donors for its economic program, external pressures inevitably played a significant role in stimulating this development. But internally generated factors were also of considerable importance. Mounting evidence of the economic and social costs of environmental degradation, the rise of a middle class, and the connection between environmental questions and other hotly contested political issues such as conflicts over land tenure and resources, the rights of workers, farmers and indigenous minorities, the demand for democratisation and greater press freedom all played a part in, moving the environment to centre stage

Patterns of Transformation

My artwork is an exploration of abstract mark-making that arises from a contemplation of the relationship between the individual and the landscape. This connects my work with a form of ecological thinking referred to as ecopsychology; a concept which offers me the freedom to explore patterns in nature while remaining purposefully connected to environmental concerns. My drawing process is thus informed by patterns in earth, sea, and sky, by the mark-making process itself and by the human detritus that pollutes, but is nevertheless a part of, the landscape as I encounter it. All of this feeds into the cycle of drawn acts. The abstraction of my drawn forms resolves into a more material practice in my sculptures which make use of found objects and evoke the entanglements that characterise the ecology of the contemporary world. In this way, my art making suggests modes of thought, encompassing all aspects of the environment, which are required to open space for ecological action

Photometric brown-dwarf classification. II. A homogeneous sample of 1361 L and T dwarfs brighter than J = 17.5 with accurate spectral types

We present a homogeneous sample of 1361 L and T dwarfs brighter than J = 17.5 (of which 998 are new), from an effective area of 3070 deg2, classified by the photo-type method to an accuracy of one spectral sub-type using izYJHKW1W2 photometry from SDSS+UKIDSS+WISE. Other than a small bias in the early L types, the sample is shown to be effectively complete to the magnitude limit, for all spectral types L0 to T8. The nature of the bias is an incompleteness estimated at 3% because peculiar blue L dwarfs of type L4 and earlier are classified late M. There is a corresponding overcompleteness because peculiar red (likely young) late M dwarfs are classified early L. Contamination of the sample is confirmed to be small: so far spectroscopy has been obtained for 19 sources in the catalogue and all are confirmed to be ultracool dwarfs. We provide coordinates and izYJHKW1W2 photometry of all sources. We identify an apparent discontinuity, $\Delta$m $\sim$ 0.4 mag., in the Y-K colour between spectral types L7 and L8. We present near-infrared spectra of nine sources identified by photo-type as peculiar, including a new low-gravity source ULAS J005505.68+013436.0, with spectroscopic classification L2{$\gamma$}. We provide revised izYJHKW1W2 template colours for late M dwarfs, types M7 to M9.Comment: Accepted for publication in A & A, 17 pages, 14 figures, catalogue of L and T dwarfs supplied here in source files (anc/ directory), and available on CD

Propagation effects on spread-spectrum mobile satellite systems

In contrast to the situation at L-band, wide bandwidths of 500 MHz or more have been allocated for mobile satellite service at frequencies between 20 and 50 GHz. These broad bandwidths are well suited for the use of spread-spectrum. Certain system considerations about the use of such high frequencies for mobile satellite service are mentioned first, and attention is then given to propagation effects on high-frequency broad-band systems. Attenuation due to rain is a constant at 20 to 50 MHz, but would not be a serious problem if outages occurring for one to three percent of the time, depending on location, are considered to be acceptable. Clear air absorption becomes a significant factor above 40 GHz, but should not exceed 2 dB at a 10 degree elevation angle and frequencies below 40 GHz. Spread-spectrum provides a form of frequency diversity that helps to minimize the effects of multipath