نتایج جستجو برای: 0004 bias error and hec
تعداد نتایج: 16861142 فیلتر نتایج به سال:
In this work, we present new insights related to a debate on the morphological structure of hydroxyethyl cellulose (HEC) molecules when dissolved in water, i.e., whether HEC adopts a linear-flexible or a rod-like fibrillar configuration. We have employed “seven” rheological techniques to explore the viscoelastic properties of HEC solutions at different time and length scales. This work demonstr...
بخش وسیعی از کشور ما در قسمت خشک و نیمه خشک قرار دارد.. در این مناطق بارش معمولأ ناچیز و نامنظم است و تغییرات شدید مکانی و زمانی دارد که تأثیر زیادی بر چرخه هیدرولوژیکی و منابع آب دارد. شناخت هیدرولوژی مناطق خشک لازمه شناخت این محیط ها و تشخیص آسیب پذیری آنها به تغییر است. مدیریت موثر منابع آب ضروری است که نیازمند سامانه پشتیبانی تصمیم گیری شامل ابزارهای مدل سازی است. انتخاب مدل، نیاز به تشخیص ...
INTRODUCTION Few studies have described the inequalities in hormonal emergency contraception (HEC) use in developing countries. Thus, the main aim of this manuscript is to study socio-demographic inequalities in HEC use among Nicaraguan women, and to study if inequalities in HEC use arise from exposure to different forms of intimate partner violence (IPV). METHODS Data from a national cross-s...
Precision and reliability are two main performance characteristic in low-cost Inertial Navigation System(INS). Increase of precision in low-cost INS without auxiliary sensors is main challenge. Bias instability leads to position drift error in inertial navigation system. In addition, fault occurrence makes the sensor reliability is decreased. Rotation of Inertial Measurement Unit(RIMU) and use ...
In this paper we treat a general form of location model. It is typically assumed that the error term is distributed according to the law belonging to the class of elliptically contoured distribution. Some sorts of shrinkage estimators of location and scale parameters are proposed and their exact bias and MSE expressions are derived. The performance of the estimators under study are compl...
High endothelial venules (HEV) allow rapid and selective lymphocyte trafficking from the blood into secondary lymphoid tissues. Here we report the expression profile of active genes in mouse high endothelial cells (HEC). HEC were first purified from mouse lymph nodes (LN) by magnetic cell sorting with MECA-79 mAb and a 3'-directed cDNA library that faithfully represents the composition of mRNA ...
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