Higher order solitary solutions to the meta-model of diffusively coupled Lotka–Volterra systems

A meta-model of diffusively coupled Lotka–Volterra systems used to model various biomedical phenomena is considered in this paper. Necessary and sufficient conditions for the existence of nth order solitary solutions are derived via a modified inverse balancing technique. It is shown that as the highest possible solitary solution order n is increased, the number of nonzero solution parameter values remains constant for solitary solutions of order $n>3$ n > 3 . Analytical and computational experiments are used to illustrate the obtained results.

KLASIFIKASI SENTRA INDUSTRI PERIKANAN BERBASIS PELABUHAN PERIKANAN: KASUS DI KABUPATEN BELITUNG

Klasifikasi pelabuhan perikanan Indonesia yang terdiri atas PelabuhanPerikanan Samudera, Pelabuhan Perikanan Nusantara, Pelabuhan PerikananPantai, dan Pusat Pendaratan Ikan. Klasifikasi tersebut di atas didasari hubungan inti plasma di mana pelabuhan perikanan yang besar ditunjang beberapa pelabuhan perikanan yang lebih kecil (Direktorat Jenderal Perikanan Tangkap, 2008). Hubungan inti plasma tersebut tidak berjalan karena tidak mempunyai pola hubungan yang jelas. Oleh sebab itu diperlukan alternatif klasifikasi pelabuhan perikanan dengan memasukan unsur jaringan industri seperti yang diusulkan oleh Israel & Rouqe (2000) yang mengklasifikasikan pelabuhan perikanan menjadi tiga yaitu penyedia jasa utama, penyedia jasa antara (server), dan client. Penelitian ini bertujuan menentukan klasifikasi sentra industri perikanan berbasis pelabuhan perikanan dalam jaringan industri yang efektifdan efisien dilakukan di Kabupaten Belitung selama 11 bulan sejak Oktober 2007 sampai Agustus 2008. Metode yang dipergunakan adalah multi criteria analysis yang dilanjutkan dengan analisis technique for order preference by similarity to ideal solution. Parameter yang diukur meliputi infrastruktur pelabuhan perikanan, kapasitas kapal perikanan, kemandirian faktor input, dan produksi. Hasil penelitian menunjukan bahwa Pulau Belitung berperan sebagai penyedia jasa utama, Pulau Mendanau, dan Pulau Seliu berperan sebagai penyedia jasa antara (server), dan Pulau Gersik dan Pulau Sumedang berperan sebagai client.Klasifikasi pelabuhan perikanan dalam suatu jaringan industri berimplikasi pada peningkatan efektivitas dan efisiensi pembangunan pelabuhan perikanan tangkap sebagai sentra industri perikanan tangkap.Indonesian government classify fishing port into 4 categories namely Ocean Fishing Port, National Fishing Port, Sea Shore Fishing Port, and Fish Landing Fishing Port. The above classification based on partnership or lingkage industry among fishing ports. However, the lingkage industry do not run effectively due to unappropriate pattern. Improving the condition, Israel & Roque (2000) suggested to classify fishing port into 3 categories namely main service provider, intermediate service provider or server, and client. This paper describes an alternative formula that considers industrial linkage among fishing ports as fishing industrial centers. The research was held on Belitung Regency as long as 11 months from October 2007 to August 2008. There are several factors should be considered in building fishing port namely fishing facilities, fishing capacity, input dependency and fish landing capacity. The 4 factors are analyzed by multi criteria analysis then continued by technique for order preference by similarity to ideal solution analysis. The research concludes that the Belitung is as the main service provider, the Mendanau Island and Seliu Islands are as the intermediate service provider or server, the other 2 islands are as the client. The new classification will increase effectiveness and efficiency of fishing port developments.

Improved Tikhonov Regularization Research and Applied in Inverse Problem

The regularization which constructs with the first filter function is precisely the Tikhonov regularization. This article has proven the Tikhonov functional minimization problem is decides suitably, namely satisfies the solution the existence, the solution unique reconciliation to rely on continuously the data stability; and this minimization problem in solves the first class equation equally the normal equation. The numerical simulation experiment's result indicated that distinguishes the inverse with the regular reduction solution parameter to have the numerical precision to be high and the stability is good and convergence rate quick characteristic.

Modelling of Phase Diagram Boundaries at Equilibrium of Two Binary Regular Phases

The conditions of occurrence of extremes on the solidus and liquidus curves in a binary isobaric phase diagram are specified. The solid and liquid phases are regarded as regular solutions in equilibrium. Two simplifying assumptions are made: (i) the Gibbs function of melting of the pure components is a linear function of temperature; (ii) the two phases in equilibrium are regular solutions with a temperature-dependent regular solution parameter. The conditions of occurrence of inflexion points on the solidus and/or liquidus curves are obtained by modelling.