نتایج جستجو برای: aspen hysis

تعداد نتایج: 2777  

Journal: :Tree physiology 2005
Jack A Chapman John S King Kurt S Pregitzer Donald R Zak

Rising atmospheric carbon dioxide (CO2) concentration ([CO2]) could alter terrestrial carbon (C) cycling by affecting plant growth, litter chemistry and decomposition. How the concurrent increase in tropospheric ozone (O3) concentration ([O3]) will interact with rising atmospheric [CO2] to affect C cycling is unknown. A major component of carbon cycling in forests is fine root production, morta...

Journal: :Annals of botany 2007
Stuart C Wooley Jack R Donaldson Michael T Stevens Adam C Gusse Richard L Lindroth

BACKGROUND AND AIMS A wide variety of plants produce extrafloral nectaries (EFNs) that are visited by predatory arthropods. But very few studies have investigated the relationship between plant genetic variation and EFNs. The presence of foliar EFNs is highly variable among different aspen (Populus tremuloides) genotypes and the EFNs are visited by parasitic wasps and predatory flies. The aim h...

2016
Jing Gao Fengfeng Kang Hairong Han

Litter quality is often considered the main driver of rates of decomposition. Litter decomposes faster in its home environment than in any other environment, which is called the home-field advantage (HFA). However, evidence for this phenomenon has not been universal. In addition, litter mixtures of different species can induce a non-additive effect (NAE) on decomposition processes. However, the...

Journal: :Global change biology 2013
Leander D L Anderegg William R L Anderegg John Abatzoglou Alexandra M Hausladen Joseph A Berry

Globally documented widespread drought-induced forest mortality has important ramifications for plant community structure, ecosystem function, and the ecosystem services provided by forests. Yet the characteristics of drought seasonality, severity, and duration that trigger mortality events have received little attention despite evidence of changing precipitation regimes, shifting snow melt tim...

2005

Ci.—Aspen stands and riparian areiis are important to breeding birds in ihe southwestern U.S. because they provide tesources such as food atid shelter. We investigated how this importance varies throughoul the year for bolh resident and migratory birds. We sampled hitds in 96 sites, half in small isolated aspen stands and half in the ponderosa pine forest in northern Ariirona thiring tlie sumiu...

2018
Majo Davis

During transportation, there will be vaporization of LNG producing boil-off gas (BOG) and its re-liquefaction is required considering that large volume of BOG to be vented out. A cryogenic refrigeration cycle is utilized in order to re-liquefy the BOG and returns it to the cargo tank. Kapitza and claude are the usually used LNG re-liquefaction cycles. The developments in the processes adopted f...

Journal: :Ecology 2010
Matthew J Kauffman Jedediah F Brodie Erik S Jules

Behaviorally mediated trophic cascades (BMTCs) occur when the fear of predation among herbivores enhances plant productivity. Based primarily on systems involving small-bodied predators, BMTCs have been proposed as both strong and ubiquitous in natural ecosystems. Recently, however, synthetic work has suggested that the existence of BMTCs may be mediated by predator hunting mode, whereby passiv...

2005
J. A. Jara A. Garea J. A. Irabien

Abstract The aim of this case study is to develop a process model including both heat integration and separation processes by means of ASPEN PLUS simulation software. Previous studies have attempted to develop kinetic models or to retrieve optimal policies for operating the process multitubular catalytic fixed-bed reactor. This time a rigorous model is developed in ASPEN CUSTOM MODELER and expo...

Journal: :Blue Jay 1949

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی شیمی 1391

با توجه به این که جریان 12011 که جریان بازگشتی به راکتور است دارای حدود ton/hr 2 مواد به عنوان others بود متخصصین پتروشیمی سعی در کشف مواد تشکیل دهنده ی این مقدار مجهول را داشتند که با شبیه سازی دینامیکی فرایند تا حدودی می توان حدس زد که ترکیب درصد این ton/hr2 مواد مجهول چیست. با توجه به نمودارهای غلظت گرفته شده از پتروشیمی و نظر خواهی از پرسنل این واحد این نتیجه بدست آمد که در واقع قسمت اصلی ...

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