Congrès International d'Architecture Moderne

About: Congrès International d'Architecture Moderne is a based out in . It is known for research contribution in the topics: Boundary value problem & Jet (fluid). The organization has 393 authors who have published 403 publications receiving 4104 citations.

Circular Slits Map of Bounded Multiply Connected Regions

Abstract: We present a boundary integral equation method for the numerical conformal mapping of bounded multiply connected region onto a circular slit region. The method is based on some uniquely solvable boundary integral equations with adjoint classical, adjoint generalized, and modified Neumann kernels. These boundary integral equations are constructed from a boundary relationship satisfied by a function analytic on a multiply connected region. Some numerical examples are presented to illustrate the efficiency of the presented method.

Effect of pre-grazing herbage mass and daily herbage allowance on perennial ryegrass swards structure, pasture dry matter intake and milk performance of Holstein-Friesian dairy cows.

Abstract: To maximize milk output and milk solids per hectare from grazing dairy cows it is necessary to identify the level of grazing swards in order to achieve high pasture dry matter intake (PDMI). The aim of this study was to investigate the effect of pre-grazing herbage mass (HM) and daily herbage allowance (DHA) on perennial ryegrass (Lolium perenne L.) swards structure, PDMI and milk performance. Sixty-four spring-calving Holstein-Friesian dairy cows were balanced and randomly assigned to one of four (n = 16) grazing groups (LL, LH, HL and HH) in a 2 × 2 factorial design. The treatments consisted on two pre-grazing HM, low (L- 1,600 kg DM ha ‐1 ) or high (H- 2,400 kg DM ha ‐1 ) and two DHA, low (L- 15 kg DM cow ‐1 day ‐1 ) or high (H- 20 kg DM cow ‐1 day ‐1 ). Swards structure, PDMI and milk performance were examined across the grazing season. The low HM groups completed 9.5 rotations of average 22 days length compared to 6.5 rotations of 32 days for the high HM groups. Herbage utilization was greater (p 4.0 cm) were lower (p < 0.001) for the low HM (221 and 170 kg ha ‐1 , respectively) than for the high HM (388 and 303 kg ha ‐1 , respectively). The high DHA had higher (p < 0.001) milk output (19.5 kg day ‐1 ) and milk solids (1.46 kg cow ‐1 ). The highest milk output per ha and per cow was achieved by LH, with low post-grazing residuals and high sward quality. Additional key words: grass intake; grazing management; herbage utilization; milk output per hectare; pasture allowance; spring-calving cows; sward quality.

Nonlinear arash model in DEA

Abstract: This study illustrates the nonlinear Arash Model (AM) in Data Envelopment Analysis (DEA) to distinguish between technical efficient DMUs and arrange both technical efficient and inefficient DMUs at the same time. It demonstrates how the proposed model it is able to eliminate the computational complexity of using most super-efficiency with selecting the variety of weights and scale. The nonlinear AM optimizes the efficiency score of linear AM, too. Some related propositions to the proposed model are proved which are also examined with a numerical example. The results clearly depict the differences between nonlinear and linear Arash Model and introduce the nonlinear AM as a valuable model in DEA. Keywords: Arash method, data envelopment analysis, efficiency, technical efficiency INTRODUCTION In the last three decades Data Envelopment Analysis (DEA) which is a nonparametric method in operations research has rapidly applied in many branches of sciences to measure the efficiency of firms or Decision Making Units (DMUs). DEA estimates the performance evaluation of homogenous DMUs with multiple inputs and multiple outputs. It was proposed by Charnes .