An asymptotic shape theorem for random linear growth models

In this note, we generalize the asymptotic shape theorem proved in [Des14a] for a class of random growth models whose growth is at least and at most linear. In this way, we obtain asymptotic shape theorems conjectured for several models: the contact process in a randomly evolving environment [SW08], the oriented percolation with hostile immigration [GM12b] and the bounded modified contact process [DS00]

KAJIAN PRODUKSI BIOGAS METODE SOLID-STATE ANAEROBIC DIGESTION (SS-AD) DARI DAUN ECENG GONDOK DENGAN RESPONSE SURFACE METHODOLOGY (RSM)

ABSTRAK Eceng gondok merupakan jenis gulma air dengan tingkat pertumbuhan yang sangat cepat di berbagai badan air seperti Danau Rawapening sehingga menjadi suatu permasalahan yang perlu diatasi. Eceng gondok dapat dimanfaatkan untuk produksi biogas karena mengandung hemiselulosa yang cukup tinggi. Tujuan penelitian ini adalah untuk (1) mengetahui nilai dari rasio C/N, TS, dan konsentrasi microbial consortium yang optimum untuk produksi biogas dari eceng gondok dengan metode SS-AD, (2) mengkaji laju produksi biogas yang dihasilkan. Variasi yang digunakan untuk variabel rasio C/N sebesar 20, 35, dan 50, untuk TS sebesar 15%, 27,5%, dan 40% sedangkan untuk konsentrasi microbial consortium sebesar 3%, 6%, 9%. Digunakan 16 reaktor dengan variasi yang ditentukan dengan Central Composite Design pada software Statistica. Hasil produksi biogas kemudian diolah dengan Response Surface Methodology untuk optimasi. Dari pengolahan RSM didapatkan nilai optimum dari rasio C/N yaitu 32,09; TS rentang 5% - 10%, serta konsentrasi microbial consortium sebesar 7,26%. Reaktor dengan nilai mendekati nilai optimum tersebut kemudian dianalisa produksi biogas yang dihasilkannya menggunakan Polymath 6.0. Sehingga didapatkan hasil konstanta kinetika laju produksi biogas (U) sebesar 1,88mL/gr TS hari; konstanta produksi biogas maksimum sebesar 108,41 mL/gr TS; serta waktu minimum terbentuknya biogas yaitu 8,87 hari. Kata kunci : eceng gondok, biogas, RSM, SS-AD ABSTRACT Water hyacinth is a type of water weed with a very rapid growth rate in various water bodies like Lake Rawapening which makes it a problem that needs to be overcome. Water hyacinth can be utilized for biogas production because it contains high hemicellulose. The purpose of this research is (1) to know the optimum value of the ratio of C/N, the concentration of TS, and microbial consortium for the optimum biogas production from water hyacinth with SS-AD method, (2) to study the production rate produced. The variations used for the C/N ratio are 20, 35, and 50, for TS are 15%, 27.5%, and 40% respectively, while for the concentration of microbial consortium are 3%, 6%, 9%. There are 16 reactors used with variations in each reactor determined by Central Composite Design in Statistica software. Biogas production results are then processed with Response Surface Methodology for optimization. Based on the RSM analysis, the optimum value of C/N ratio is 32,09; TS range of 5% - 10%, and the concentration for microbial consortium is 7.26%. Reactor which the value of the variable inside has the closest value with the optimum then analyzed its biogas production rate using Polymath 6.0. The constant kinetics rate of biogas (U) production rate is 1.88mL/g TS day; maximum biogas production constant of 108.41 mL/g TS; as well as the minimum time of the formation of biogas is 8.87 days. Keywords : water hyacinth, biogas, RSM, SS-A

Medical segetal flora of Central Poland

In the paper a list and general characterization of medical segetal flora of Central Poland is given. This flora consists of 300 taxa. Among the most threatened species there are 6 taxa: Adonis aestivalis, A. flam mea, Anagallis foemina, Bupleurum rotundifolium, Camelina saliva, Cuscuta europaea.Zadanie pt. „Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki” nr 885/P-DUN/2014 dofinansowane zostało ze środków MNiSW w ramach działalności upowszechniającej naukę

Vascular plants flora of the railway grounds of Zduńska Wola

In the paper a list and general characterization of vascular plants flora recorded on railway grounds in the city of Zduńska W ola is presented. The great diversity of habitats within the railway grounds as well as their readiness to accept numerous introduced species result in a high variety of vascular plants there. This flora consists of 366 taxa.Zadanie pt. „Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki” nr 885/P-DUN/2014 dofinansowane zostało ze środków MNiSW w ramach działalności upowszechniającej naukę

PENGARUH KARAKTERISTIK SISTEM DAN INDIVIDU TERHADAP PENERIMAAN SISTEM ANGGARAN UNIVERSITAS SURABAYA

Nowadays, role of information technology in any aspect of human being has grown rapidly. Peoples need to quickly adapt with these situation. In fact, main factor causing failure in implementation of an information technology is the human resources associated with these technologies. This study examines the influence of system characteristics and individual characteristics in acceptance of University Budgeting System through the technology acceptance model. Using data collected by a quiestionaire conducted in 26 sub-systems in Surabaya University that used internet-based Budgeting system, this study finds that perceived usefulness and perceived ease of use significantly have a positive impact on attitude toward using a technology. Individual characteristics such as computer self efficacy, age, gender, educational level and experience influence user acceptance of technology but system characteristics such as relevant, screen design, complexity has no impact at all