Seasonally and Fractionally Differenced Time Series

fractional differencing, Lagrange multiplier test, long memory, seasonal differencing, seasonal persistence

Cracking Callophyllum Innophyllum L. Oil to Bio-gasoline by Micro-porous Based Zeolite and Al2O3 Catalysts

AbstractNatural minerals such as zeolite are local natural resources in the various regions in Indonesia which has application as a filler, bleaching agent, or dehydration agent. It also has function as green catalysts material for biomass conversion into bio-fuel. The trend movement of green and sustainable chemistry research that designing environmentally friendly chemical processes from renewable raw materials to produce innovative products derived biomass for bio-fuel. Callophyllum innophyllum L.seeds can be used as raw material for bio-energy because of its high oil content. The fatty acid and triglyceride compounds of these seeds can be cracked into bio-gasoline, which does not contain oxygen in the hydrocarbon structure. This paper focused on the preparation and formulation of the catalyst NiMo/Al2O3 and NiMo/H-Zeolite which was used in hydro-cracking process of oil from Callophyllum innophyllum L. seeds to produce bio-gasoline. The catalysts were characterized using XRD, BET and FTIR-adsorbed pyridine method. The results of hydro-cracking products mostly were paraffin (C10-C19) straight chain, with 59.5% peak area based on GC-MS analysist

Enhancing Value for Money of Mega Infrastructure Projects Development Using Value Engineering Method

AbstractInfrastructure development plays an important role to stimulate the nation's economic growth. During 2011, infrastructure industry contributed 5.5% to the GDP of Indonesia with real growth of 9.3%. Two mega infrastructure projects have been developed in the past few years: Sunda Strait Bridge (SSB) to connect Sumatra and Java Islands, thus increase economic integration between the two major islands, and; Soekarno-Hatta International Rail Link (SHIARL) as an alternative mass transportation which is expected to provide accessibility and mobility for people and goods around Greater Jakarta area to the airport. The two mega infrastructure projects listed in MP3EI program in 2011 required comprehensive study in the aspects of planning, funding, and techniques of projects developments. This research is proposed to produce a conceptual design of SSB and SHIARL in order to gain maximum result and generate added values to the projects. This research employed a combination of quantitative and qualitative methods through questionnaire survey distributed to the related stakeholders of the projects and focus group discussion (FGD). The results identified additional functions for innovation to both mega infrastructure projects. Life cycle cost analysis confirmed that there is an increasing in value for money from the additional functions in respective projects

PHYSICAL MODEL OF SI-ENGINE PROCESS AND GAS EXCHANGE FOR REAL-TIME IMPLEMENTATION IN ENGINE MANAGEMENT SYSTEM

This paper presents a physical, crank angle resolved model of spark ignited (SI) engine process and gas exchange developed by Continental AG for real‐time engine management system. Transient 1D flow in pipe systems is the most time‐consuming part of the numerical solution. A so‐called detailed model, including intake and exhaust pipe components, is defined and reduced to its fast‐running version where pipes are neglected. Experimental validation confirms that the detailed model captures transient effects and fulfills accuracy targets over the entire engine operation range, while the fast‐running model requires additional empirical parameterization. Both models, however, provide more detailed information on dynamic gas exchange process and the in‐cylinder state for each individual engine cycle than today’s data driven models do (e.g., transient gas states and internal engine exhaust gas recirculation). Finally, simplifications according to classical acoustic theory are proposed for pipe components to solve the conflict between accuracy and real‐time capability.Tento článek prezentuje fyzikální model čtyřdobého procesu a výplachu zážehového spalovacího motoru. Model byl vyvinut u Continental AG pro účely sériových řídících jednotek. Nestacionární 1D proudění v potrubních systémech je časově nejnáročnější součástí numerického řešení. Proto je nejprve definován podrobný model, zahrnující řešení sacích a výfukových potrubí, který je dále zjednodušen na rychle fungující verzi se zanedbáním zákona zachování impulsu v potrubních systémech. Experimentální ověření potvrzuje, že podrobný model zachycuje přechodové jevy a splňuje cíle přesnosti v celém rozsahu provozu motoru, zatímco zjednodušený model vyžaduje další empirickou parametrizaci. Oba modely však poskytují podrobnější informace o výplachu a termodynamickém stavu ve válcích než to činí běžné datově orientované modely (např. přechodné stavy plynu, nebo vnitřní recirkulace výfukových plynů motoru). Nakonec jsou navržena zjednodušení řešení proudění v potrubích podle klasické akustické teorie s cílem vyřešení rozporu mezi přesností a schopností dosáhnout řešení v reálném čase na daném hardwaru (ECU 240 MHz)

Short-run forecasting of the euro-dollar exchange rate with economic fundamentals

Incluye bibliografíaWe propose a fundamentals-based econometric model for the weekly changes in the euro-dollar rate with the distinctive feature of mixing economic variables quoted at different frequencies. The model obtains good in-sample fi t and, more importantly, encouraging outof- sample forecasting results at horizons ranging from one week to one month. Specifi cally, we obtain statistically signifi cant improvements upon the hard-to-beat random walk model using traditional statistical measures of forecasting error at all horizons. Moreover, our model improves greatly when we use the direction-of-change metric, which has more economic relevance than other loss measures. With this measure, our model performs much better at all forecasting horizons than a naive model that predicts the exchange rate has an equal chance to go up or down, with statistically signifi cant improvementsSe propone un modelo econométrico basado en fundamentales para el cambio semanal del tipo de cambio del euro frente al dólar con la característica diferencial de mezclar variables con diferentes frecuencias. El modelo obtiene buenas predicciones en la muestra, y, lo que es más importante, mejoras en predicción fuera de la muestra a horizontes entre una semana y un mes. Específi camente, obtenemos mejoras estadísticamente signifi cativas frente al difícil de batir paseo aleatorio, usando las medidas tradicionales basadas en error de predicción cuadrático medio a todos los horizontes. Las ganancias son mayores cuando utilizamos la métrica basada en la dirección del cambio, que tiene más sentido económico en un modelo como este. Con esta medida, nuestro modelo predice los movimientos alcistas y bajistas del tipo de cambio mucho mejor que un modelo basado en igual probabilidad de bajadas y subida

Annual report of the selectmen and other town officers, including a report of the school board of Danbury, N.H. for the year ending March 1, 1893.

This is an annual report containing vital statistics for a town/city in the state of New Hampshire

Reports of the town officers of Newfields, for the year ending February 15, 1896, with vital statistics and town and school warrants.

This is an annual report containing vital statistics for a town/city in the state of New Hampshire

Report of the county commissioners of Merrimack county, together with the reports of county treasurer, county convention, superintendent of county farm and house of correction, clerk of court, sheriff, jailor, solicitor, physicians, and auditors, from January 1, 1895, to January 1, 1896.

This is an annual report containing vital statistics for a county in the state of New Hampshire

Reports of the selectmen and other town officers of Newport, N.H., for the year ending Feb. 15, 1896.

This is an annual report containing vital statistics for a town/city in the state of New Hampshire

Annual report of the selectmen and other town officers, including a report of the school board of Danbury, N.H. for the year ending March 1, 1893.

This is an annual report containing vital statistics for a town/city in the state of New Hampshire