Results 41 to 50 of about 526,146 (207)

Assessing the COVID-19 Lockdown Impact on Global Air Quality: A Transportation Perspective

Atmosphere
To address the COVID-19 pandemic, governments worldwide implemented mandatory restrictions. As an unintended consequence of these responses, significant air pollution reductions have been recorded across the world.
Meina Zheng, Feng Liu, Meichang Wang
doaj   +1 more source

Modelling and Simulation of Ternary Liquid-Phase Adsorption onto Activated Carbon

Adsorption Science & Technology, 2004
A computational procedure is presented for solving the set of rigid hyperbolic and parabolic partial differential equations describing the simultaneous adsorption of a ternary system in a column packed with adsorbent particles using the non-linear ...
Olaosebikan A. Olafadehan, Alfred A. Susu   +1 more
doaj   +1 more source

A simultaneous equation model to determine taper curve.

Silva Fennica, 1978
A simultaneous equation model to determine taper curve for Scots pine is presented. The diameters at relative heights are endogenous variables and height an exogenous variable. Any equations may be substituted by the measured value of diameter.
Kilkki, Pekka, Saramäki, Matti, Varmola, Martti   +2 more
doaj   +1 more source

Luminosity distance and redshift in the Szekeres inhomogeneous cosmological models

, 2011
The Szekeres inhomogeneous models can be used to model the true lumpy universe that we observe. This family of exact solutions to Einstein's equations was originally derived with a general metric that has no symmetries. In this work, we develop and use a
Anthony Nwankwo, C.L. Bennett ., D. Garfinkle, D.N. Spergel ., G.F.R. Ellis, J. García-Bellido, John Thompson, K. Enqvist, L. Page ., M. Tanimoto, M.-N. Celerier, Mustapha Ishak, R. Sussman, T. Biswas, W. Bonnor, W. Bonnor, W.H. Press ., WMAP collaboration   +17 more
core   +1 more source

Industrial Agglomeration, Land Consolidation, and Agricultural Energy Inefficiency in China: An Analysis Using By-Production Technology and Simultaneous Equations Model

Agriculture
Improving agricultural energy inefficiency is essential for achieving sustainable agricultural development and promoting major agricultural countries to achieve carbon peak and carbon neutrality goals. This paper analyzes agricultural energy inefficiency
Biaowen Xu, Xueli Chen
doaj   +1 more source

APPLICATION OF SIMULTANEOUS EQUATIONS MODEL TO ESTIMATE PARTICLEBOARD DEMAND AND SUPPLY [PDF]

BioResources, 2011
Dynamic supply and demand equations for particleboard using a three-stage squares simulation (3SLS) were estimated. Empirical data included annual observations over the period of 1976 to 2006.
Anjang Tajdini, Amir Tavakkoli, Ahmad Jahan Latibari Mail, Mehran Roohnia Mail, Seyed Ali Haji Mirza Tayeb   +4 more
doaj  

Mathematical Modeling and Simulation of the Dehydrogenation of Ethyl Benzene to form Styrene using Steady-State Fixed Bed Reactor

Tikrit Journal of Engineering Sciences, 2010
In this research, two models are developed to simulate the steady state fixed bed reactor used for styrene production by ethylbenzene dehydrogenation. The first is one-dimensional model, considered axial gradient only while the second is two-dimensional ...
Zaidoon M. Shakoor
doaj   +1 more source

Trajectory planning method of mobile piezorobot

Lietuvos Matematikos Rinkinys, 2009
This paper presents analysis of trajectory planningmethods for mobile robots and new trajectory planning method research for mobile piezorobots. Here are deduced motional simultaneous equations for this kind of robots that describe point-to-pointmotion ...
Ramutis Bansevičius, Asta Drukteinienė, Genadijus Kulvietis   +2 more
doaj   +1 more source

Does Money Matter? An Empirical Investigation [PDF]

This paper uses a simultaneous-equations model of the new consensus macroeconomic model to examine whether the inclusion of the money stock in the aggregate demand function improves the statistical fit of the model.
Barry Huston, Farrokh Nourzad, James M. McGibany   +2 more
core  

Small Concentration Asymptotics and Instrumental Variables Inference [PDF]

Poskitt and Skeels (2005) provide a new approximation to the sampling distribution of the IV estimator in a simultaneous equations model, the approximation is appropriate when the concentration parameter associated with the reduced form model is small ...
C.L. Skeels, D.S. Poskitt
core