Population model with immigration in continuous space

نویسندگان
چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Immigration and the stable population model.

This paper reports on work aimed at extending stable population theory to include immigration. its central findings is that, as long as fertility is below replacement, a constant number and age distribution of immigrants (with fixed fertility and mortality schedules) lead to a stationary population. Neither the level of the net reproduction rate nor the size of the annual immigration affects th...

متن کامل

Bilingual Continuous Space Language Model

We attempt using simple feedforward neural networks to learn a continuous space language model (CSLM) and evaluate its performance on French and English. The training of the model is performed bilingually, in which we try to capture not only different features from one language, but also the multilingual relation demonstrated in the parallel training data. We achieved the perplexity of 191.2 on...

متن کامل

A population model with non-neutral mutations using branching processes with immigration

We consider a stationary continuous model of random size population with non-neutral mutations using a continuous state branching process with non-homogeneous immigration. We assume the type (or mutation) of the immigrants is random given by a constant mutation rate measure. We determine some genealogical properties of this process such as: distribution of the time to the most recent common anc...

متن کامل

Difference Equations from Discretization of a Continuous Epidemic Model with Immigration of Infectives

A continuous-time epidemic model with immigration of infectives is introduced. Systems of difference equations obtained from the continuoustime model by using nonstandard discretization technique are presented. Comparisons between the continuous-time model and its discrete counterpart are made.

متن کامل

On moment closures for population dynamics in continuous space.

A first-order moment closure, the mean-field assumption that organisms encounter one another in proportion to their spatial average densities, lies at the heart of much theoretical ecology. This assumption ignores all spatial information and, at the very least, needs to be replaced by a second-order closure to gain understanding of ecological dynamics in spatially structured populations. We des...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Mathematical Population Studies

سال: 2019

ISSN: 0889-8480,1547-724X

DOI: 10.1080/08898480.2019.1626189