A PDE patch-based spectral method for progressive mesh compression and mesh denoising

The development of the patchwise partial differential equation (PDE) framework a few years ago has paved the way for the PDE method to be used in mesh signal processing. In this paper, we, for the first time, extend the use of the PDE method to progressive mesh compression and mesh denoising. We, meanwhile, upgrade the existing patchwise PDE method in patch merging, mesh partitioning, and boundary extraction to accommodate mesh signal processing. In our new method, an arbitrary mesh model is partitioned into patches, each of which can be represented by a small set of coefficients of its PDE spectral solution. Since low-frequency components contribute more to the reconstructed mesh than high-frequency ones, we can achieve progressive mesh compression and mesh denoising by manipulating the frequency terms of the PDE solution. Experimental results demonstrate the feasibility of our method in both progressive mesh compression and mesh denoising

Aktivitas Antioksidan Dan Penghambatan Xantin Oksidase Kulit Batang Songi (Dillenia Serrata Thunb.): Antioxidant and Xanthine Oxidase Inhibitory Activity of Stem Bark of Songi (Dillenia Serrata Thunb.)

Songi (Dillenia serrata) is a tree endemic to Southeast Sulawesi and its stem bark been used in folk medicine. Nonetheless, only a handful scientific knowledge regarding chemistry and biological activities has been investigated on the plant. The present study aimed to investigate the antioxidant and xanthine oxidase (XO) inhibitory activity of the stem bark of the plant. Methanol extract and organic fractions (petroleum ether, ethyl acetate, and methanol) of the dried powdered stem bark of songi were evaluated for phytochemical screening, total phenolic (TPC), total flavonoid contents (TFC), DPPH, FRAP, and XO in vitro assays. Flavonoids, tannins, terpenoids, steroids, and saponins present in the extract. TPC and TFC in extract were 59.2 mg GAE/g and 23.4 mg QE/g. The contents in organic fractions were in solvent-dependent manner (methanol>ethyl acetate>petroleum ether). Extract and fractions scavenged DPPH radicals (48.2–59.7%) at 100 μg/mL compared to ascorbic acid, trolox, and gallic acid (90.3–93.8%). FRAP values varied from 0.8–3.4 μg/μg equivalent trolox amount (quercetin and gallic acid were 25.7 dan 32.4 μg/μg, respectively). They also inhibited xanthine oxidase (15.3–50.3%) at 100 μg/mL (allopurinol, 98.2%). The study concluded the potential of methanol extract and organic fraction of the stem bark of songi, thus highlighted the prospect of songi to be used in herbal and drugs development from nature

Walking on country with Bana Yarralji Bubu: a model for Aboriginal social enterprise tourism

The purpose of this research is to describe a model for Aboriginal Social enterprise tourism developed by an Aboriginal Family. This research examines the relationship between the operation of the business and the vision guiding the business owners through a qualitative case study of Bana Yarralji Bubu a tourism social enterprise in northern Queensland Australia. The business owners have used a holistic sustainability approach to pursue their cultural, environmental, well being and economic goals. This research finds however that efforts spent on achieving multi dimensional benefits have occurred at the expense of business development and profitability. The research also demonstrates that business development has been impacted both by negative social capital existing in the local commuinty as well as external factors such as land use planning and land administration systems, the political environment and the tourism market. A new model is therefore prposed that situates the tourism social enterprise relative to influences that clan relationships combined with the external forces create additional inhibiting and enabling conditions that affect the realisation of business goals and overall sustainability. This research uses the term Aboriginal social enterprise tourism as it refers to mainland Australian Aboriginal tourism opportunities, recognising that this term is most appropriately used to refer to the specific identity fo mainland Aboriginal peoples within Australia on a national level. The term Indigenous is used in the international context