نتایج جستجو برای: life table method
تعداد نتایج: 2394268 فیلتر نتایج به سال:
Life expectancy, that is the mean age at death in a life table, is the most common measure used to describe and compare mortality distributions. Alternatives to life expectancy that have been proposed so far have also referred to only a single parameter of the mortality distribution. We propose to study mortality distributions by applying Silber’s concept of the Equivalent Length of Life (ELL),...
Intrinsic population growth rate (r(max)) is an important parameter for many ecological applications, such as population risk assessment and harvest management. However, r(max) can be a difficult parameter to estimate, particularly for long-lived species, for which appropriate life table data or abundance time series are typically not obtainable. We describe a method for improving estimates of ...
به منظور مطالعه پارامترهای ژنتیکی صفات طول عمر اقتصادی گوسفند کردی از رکوردهای 7469 حیوان حاصل از 187 پدر و 2258 مادر، استفاده گردید. اثرات ثابت شامل جنس و تیپ تولد بعد از تست معنی داری انتخاب و مورد استفاده قرار گرفتند. جداول طول عمر تولیدی هم با استفاده از رویه life table نرم افزار sas استخراج شد. طبق نتایج به دست آمده حدود 99 درصد از میش های پرورشی به دلایل دیگری به جز سنشان از گله حذف شده ا...
Aims: This study aimed to investigate the relationship between family participation in sport-recreation activities with marital satisfaction and life satisfaction. Methods & materials: The research method was a survey correlation. The statistical population included all families living in Mashhad. Using the cluster sampling method, the researcher referred to selected parks of Mashhad and distr...
use of such natural compounds as essential oils and plant extracts is considered as a safe method in control of postharvest diseases as well as delay in plant tissue senescence. in this study, the effects of clove essential oil and extract was investigated on decay control and on some quantitative characteristics of table grapes during storage. grape bunches, after having been treated with diff...
In this study, fatigue test and crack propagation analysis of welded joints in ships and offshore structures were performed. The test models have two types of welded joints, T-joint and double plate. Test data is presented in S-N curves obtained by the Hot Spot Stress (HSS) approach. The S-N data for each length of crack were appraised to define the fatigue life of crack initiation and propagat...
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