Results 121 to 130 of about 10,893 (284)

Sagittal collimating diaboloid: a new grazing‐incidence mirror surface for higher‐throughput resonant inelastic X‐ray scattering spectrometers

Journal of Synchrotron Radiation, EarlyView.
We present the analytic equations for a new grazing‐incidence mirror surface, a sagittal collimating diaboloid, and illustrate its advantages for higher‐throughput soft X‐ray spectrometer design.A major challenge in soft X‐ray spectroscopy is the efficient collection of the emitted X‐rays by grazing‐incidence mirrors.
Joseph Dvorak, Lei Huang, Mourad Idir
wiley   +1 more source

Differential evolution algorithm aided minimum symbol error rate multi-user detection for multi-user OFDM/SDMA systems

A Differential Evolution (DE) algorithm assisted Minimum Symbol Error Ratio (MSER) Multi-User Detection (MUD) scheme is proposed for multi-user Multiple-Input Multiple-Output (MIMO) aided Orthogonal Frequency-Division Multiplexing / Space Division ...
Chen, Sheng, Mu, Xiaomin, Hanzo, Lajos, Zhang, Jiankang   +3 more
core  

Preemptive Entry and Technology Diffusion: The Market for Drive‐In Theaters

The RAND Journal of Economics, EarlyView.
ABSTRACT This article studies entry preemption in new industries. We first test a key prediction of dynamic entry games: Entry preemption is most relevant in intermediate‐sized markets, where firms face highest uncertainty about future entry. Using US drive‐in theater market (1945–1957) data, we find robust evidence for this non‐monotonic relationship ...
Ricard Gil, Jean‐François Houde, Shilong Sun, Yuya Takahashi   +3 more
wiley   +1 more source

The application of generalized differential quadrature to vibration problems

, 1998
ÖZET Bu çalışmada, ilk önce yapısal analizde kullanılan bazı metodlar tanıtılmıştır. Daha sonra Genelleştirilmiş Diferansiyel Quadrature Metodunu kirişlerin sehimi, çubukların burkulmaları ve serbest titreşim problemlerine uygulanmıştır.
Çetkin, Ahmet
core  

Modelagem e análise de um compressor linear para refrigeração doméstica [PDF]

, 2008
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Mecânica.Compressores lineares utilizam um atuador linear para acionar o pistão diretamente em seu movimento alternativo ...
Hülse, Emílio Rodrigues
core  

neonSoilFlux: An R package for continuous sensor‐based estimation of soil CO2 fluxes

Methods in Ecology and Evolution, EarlyView.
Abstract Accurate quantification of soil carbon fluxes is essential to reduce uncertainty in estimates of the terrestrial carbon sink. However, these fluxes vary over time and across ecosystem types and so, it can be difficult to estimate them accurately across large scales.
John Zobitz, Edward Ayres, Zoey Werbin, Ridwan Abdi, Natalie Ashburner‐Wright, Lillian Brown, Ryan Frink‐Sobierajski, Lajntxiag Lee, Dijonë Mehmeti, Christina Tran, Ly Xiong, Naupaka Zimmerman   +11 more
wiley   +1 more source

On the integrability of differential equations by quadratures according to Maximovič

Journal of Computational and Applied Mathematics, 2004
In the late 19th century, Vladimir Maximovič developed a theory of the integrability of ordinary differential equations by quadratures which has been more or less forgotten by now. The author intends to present in the article a rigorous form of Maximovič's definition of integrability by quadratures and to prove that all first-order ordinary ...
openaire   +1 more source

From tetrachoric to kappa: How to assess reliability on binary scales

British Journal of Mathematical and Statistical Psychology, EarlyView.
Abstract Reliability is crucial in psychometrics, reflecting the extent to which a measurement instrument can discriminate between individuals or items. While classical test theory and intraclass correlation coefficients are well‐established for quantitative scales, estimating reliability for binary outcomes presents unique challenges due to their ...
Sophie Vanbelle
wiley   +1 more source

Asymptotic standard errors for reliability coefficients in item response theory

British Journal of Mathematical and Statistical Psychology, EarlyView.
Abstract In a recent review, Liu et al. (Psychological Methods, 2025b) classified reliability coefficients into two types: classical test theory (CTT) reliability and proportional reduction in mean squared error (PRMSE). This article focuses on quantifying the sampling variability of these coefficients under item response theory (IRT) models.
Youjin Sung, Yang Liu
wiley   +1 more source

Differential quadrature method for partial differential equations

, 2021
Bu tez çalışmasında, kısmi türevli denklemler ile tanımlanmış problemlerin diferansiyel kareleme yöntemiyle çözümleri verilmiştir. İlk üç problemin denklemleri teorik çözümleri mevcut olan Poisson, Helmholtz ve conveksiyon-difüzyon-reaksiyon denklemleri olup Dirichlet tipindeki sınır koşullarına sahiptirler.
openaire   +1 more source