نتایج جستجو برای: var شرطی

تعداد نتایج: 28194  

Journal: :Eukaryotic cell 2011
Lakshmi Swamy Borko Amulic Kirk W Deitsch

Antigenic variation in the human malaria parasite Plasmodium falciparum depends on the transcriptional regulation of the var gene family. In each individual parasite, mRNA is expressed exclusively from 1 var gene out of ∼60, while the rest of the genes are transcriptionally silenced. Both modifications to chromatin structure and DNA regulatory elements associated with each var gene have been im...

ژورنال: :مهندسی مالی و مدیریت اوراق بهادار 2013
منصور کاشی رضا روشن محمد دنیایی

پژوهش حاضر به بررسی ارتباط علی و همزمان بازده سهام، حجم معاملات و نوسان بازده با استفاده از مدل های چندگانه var-grj-garch و grj-garch-dcc پرداخته است. برای تخمین ارتباط همزمان بازده سهام و حجم معاملات، به جای رویه یک مرحله ای از رویه دو مرحله ای استفاده شد که بر مشکلات عددی معین که اغلب در تخمین مدل های چندگانه garch پیش می آید، غلبه خواهد کرد. در ابتدا و برای پاسخ به فرضیه اول، با استفاده از م...

Journal: :Journal of vector ecology : journal of the Society for Vector Ecology 2000
G G Marten M Nguyen G Ngo

Cyclopoid copepods and mosquito larvae were surveyed in southwestern Louisiana rice fields. Almost every rice field had a natural population of Mesocyclops ruttneri, Acanthocylops vernalis, or Macrocyclops albidus. Judging from the abundance of pupae, 29% of the fields were responsible for virtually all Anopheles quadrimaculatus production, apparently because larval mortality suppressed product...

2017
Cheng-Kuan Lin Huei-Yang Hung David C. Christiani Francesco Forastiere Ro-Ting Lin

After publication of the article [1], it has been brought to our attention that the original version of this Article contained a typo in the 3rd paragraph of the section 'Review process and data extraction'. It concerns the equation published as "Var(lnRR) = Var(lnR1 + lnR0)". On the right part, the "+" within the parenthesis should be "-", as defined and derived from the left part. As a result...

2011
Donald S. Chen Alyssa E. Barry Aleksandra Leliwa-Sytek Terry-Ann Smith Ingrid Peterson Stuart M. Brown Florence Migot-Nabias Philippe Deloron Moses M. Kortok Kevin Marsh Johanna P. Daily Daouda Ndiaye Ousmane Sarr Souleymane Mboup Karen P. Day

BACKGROUND The reservoir of Plasmodium infection in humans has traditionally been defined by blood slide positivity. This study was designed to characterize the local reservoir of infection in relation to the diverse var genes that encode the major surface antigen of Plasmodium falciparum blood stages and underlie the parasite's ability to establish chronic infection and transmit from human to ...

2014
N. Gustafsson

A four-dimensional ensemble variational (4D-EnVar) data assimilation has been developed for a limited area model. The integration of tangent linear and adjoint models, as applied in standard 4D-Var, is replaced with the use of an ensemble of non-linear model states to estimate fourdimensional background error covariances over the assimilation time window. The computational costs for 4D-En-Var a...

Journal: :Journal of cell science 2004
Marion Delattre Anne Spierer Yannis Jaquet Pierre Spierer

The Su(var)3-7 protein is essential for fly viability, and several lines of evidence support its key importance in heterochromatin formation: it binds to pericentric heterochromatin, it potently suppresses variegation and it interacts with HP1. However, the mode of action of Su(var)3-7 is poorly understood. Here we investigate in vivo the consequences of increased Su(var)3-7 expression on fly v...

2007
Hedibert F. Lopes Helio S. Migon

Vector autoregressions (VAR) are extensively used to model economic time series. The large number of parameters is the main diicult with VAR models, however. To overcome this, Litterman (1986) suggests to use a Bayesian strategy to estimate the VAR, equation by equation, where, a priori, the lags have decreasing importance (known as Litterman Prior). In this paper, a VAR model is analyzed throu...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه الزهراء - دانشکده علوم اجتماعی و اقتصادی 1391

در بازارهای مالی سرمایه گذاران همواره به فکر بازدهی ناشی از دارایی مالی مورد نظر خود هستند. لذا آگاهی و پیش بینی روند بازدهی آتی این دارایی ها از اهمیت خاصی برخوردار است. از طرف دیگر با توجه به اینکه بازدهی دارایی های مالی در طول زمان دچار نوسان می شود لذا باعث بوجود آمدن ریسک-هایی در این بازارها خواهند شد که بایستی از طریق سنجه های ریسک اندازه گیری شوند، یکی از روش های اندازه گیری ریسک ارزش در...

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