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تعداد نتایج: 2052721 فیلتر نتایج به سال:
data envelopment analysis (dea) is a powerful tool for measuring relative efficiency of organizational units referred to as decision making units (dmus). in most cases dmus have network structures with internal linking activities. traditional dea models, however, consider dmus as black boxes with no regard to their linking activities and therefore do not provide decision makers with the reasons...
the present dissertation aims to investigate four-word lexical bundles in applied linguistics research articles by iranian and internationally-published writers. the aims of this study are two-fold: first of all, attempts have been made to create a comprehensive list of the most commonly used four-word lexical bundles categorized by their type and token frequency, their structural characteristi...
abstract the variables affecting the nature of reading comprehension can be classified into two general categories: reader’s variables, and text variables (alderson, 2000). despite the wave of research on vocabulary knowledge as reader’s variable, the role of this knowledge in c-test as a text-dependent test and its interaction with lexical cohesion of the test as a text feature has remained a...
Perovskite solar cells (PSCs) are an attractive emerging photovoltaic technology due to their high-performance while being made by low-cost fabrication processes. The most efficient PSCs small area and nonscalable coating method in inert atmosphere, but these sizes conditions commercially irrelevant. Herein, of is reported using only scalable methods, that is, slot-die blade all ambient air. to...
Cobalt-free, single crystal layered-oxide positive electrode materials like Li 1+x [Ni 0.6 Mn 0.4 ] 1−x O 2 (NM64) have received recent interest because of their low cost, high-voltage stability, and good cycle life. In this work, NM64 is successfully produced with a simple all-dry synthesis process that requires no water, intermediate chemicals, produces little waste. The synthesized has ≤ 4% ...
A class of infinite impulse response (IIR) perfect reconstruction (PR) filterbank is obtained with an allpass delay chain and finite impulse response (FIR) matrices at the analysis side. Such a formulation leads to a filterbank that can be optimized to any desired response. For a first-order allpass, the synthesis bank becomes FIR. Design examples showing warping of the frequency scale and filt...
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