Results 71 to 80 of about 466,509 (186)

Comparison of Frontier Efficiency Methods: An Application to the U.S. Life Insurance Industry [PDF]

The objective of this paper is to provide new information on the performance of efficiency estimation methods by applying a wide range of econometric and mathematical programming techniques to a sample of U.S. life insurers.
Hongmin Zi, J. David Cummins
core  

Examination of the vessel's shape, resistive force and volumetric-aqueous efficiencies to optimize the vessels' foil under noise propagation

Heliyon
There are several parameters in designing undersurface vessel forms, the most important of which is the hull's total strength, which includes the strength of the hull and its attachments. According to studies, 70 % of the total strength of the vessels is
Zhiheng Xu, Yan Shi, Shelesh Krishna Saraswat, Dheyaa J. Jasim, Ahmad Keshavarzi, Soheil Salahshour, Ahmed Alawadi, S.A. Eftekhari   +7 more
doaj   +1 more source

Hull-form optimization of a container ship based on bell-shaped modification function

International Journal of Naval Architecture and Ocean Engineering, 2015
In the present study, a hydrodynamic hull-form optimization algorithm for a container ship was presented in terms of the minimum wave-making resistance.
Hee Jong Choi
doaj   +1 more source

The Aerodynamic Drag of Flying-boat Hull Model as Measured in the NACA 20-foot Wind Tunnel I. [PDF]

Measurements of aerodynamic drag were made in the 20-foot wind tunnel on a representative group of 11 flying-boat hull models. Four of the models were modified to investigate the effect of variations in over-all height, contours of deck, depth of step ...
Hartman, Edwin P
core   +1 more source

Determination of hull efficiency parameters for a deep submergence hull form

, 1966
U.S. Navy (U.S.N.) authors.
Morgan, Henry Anthony., Szczypinski, Walter Stanley.   +1 more
openaire   +1 more source

Tank Tests of Model 11-G Flying-boat Hull [PDF]

The NACA model 11-G flying-boat hull, a modification of NACA model 11-A was tested over a range of loadings. The planing bottom of model 11-G has a variable-radius flare, or concavity, at the chines in contrast to the straight V planing bottom of model ...
Parkinson, J B
core   +1 more source

The Pontoon Design Optimization of a SWATH Vessel for Resistance Reduction

Journal of Marine Science and Engineering
This study applies a deep neural network (DNN) to optimize the 22.5 m pontoon hull form of a small waterplane area twin hull (SWATH) vessel with fin stabilizers, aiming to reduce calm water resistance at a Froude number of 0.8 under even keel conditions.
Chun-Liang Tan, Chi-Min Wu, Chia-Hao Hsu, Shiu-Wu Chau   +3 more
doaj   +1 more source

A General Tank Test of NACA Model 11-C Flying-boat Hull, Including the Effect of Changing the Plan Form of the Step [PDF]

The results of a general tank test model 11-C, a conventional pointed afterbody type of flying-boat hull, are given in tables and curves. These results are compared with the results of tests on model 11-A, from which model 11-C was derived, and it is ...
Dawson, John R
core   +1 more source

Lines optimization of river cruise ship based on numerical simulation of resistance and self-propulsion

Zhongguo Jianchuan Yanjiu
ObjectivesBased on the numerical simulation of resistance and self-propulsion, the lines optimization of an inland river cruise ship is carried out with resistance and delivered power as the optimization objectives.
Baoguo CHENG, Jinfeng HAO, Zhaoxin QIANG, Chengshun ZHANG   +3 more
doaj   +1 more source

Hull form optimization for polar carrier based on navigation state recognition model

Journal of Ocean Engineering and Science
Polar Carriers operate in both open water and brash ice areas, where differing navigation environments impose varying requirements on hull form design.
Jianmei Chen, Zhe Chen, Qiang Ma, Yuqing Zhang, Yanping He   +4 more
doaj   +1 more source