Process and Physical Metallurgical Developments for High-Performance Niobium-Containing Pressure Vessel Plate Steels

2020 ◽  
Author(s):  
S. Jansto
Keyword(s):  
Pressure Vessel ◽  
High Performance ◽  
Plate Steels

scholarly journals Multi-membrane search algorithm

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0260512
Author(s):  
Qi Song ◽  
Yourui Huang ◽  
Wenhao Lai ◽  
Tao Han ◽  
Shanyong XU ◽  
...  
Keyword(s):  
Pressure Vessel ◽  
High Performance ◽  
Search Algorithm ◽  
Biological Behavior ◽  
Cell Secretion ◽  
Population Number ◽  
Beam Design ◽  
Statistical Experiments ◽  
Comparison Algorithms ◽  
Better Than

This research proposes a new multi-membrane search algorithm (MSA) based on cell biological behavior. Cell secretion protein behavior and cell division and fusion strategy are the main inspirations for the algorithm. In order to verify the performance of the algorithm, we used 19 benchmark functions to compare the MSA test results with MVO, GWO, MFO and ALO. The number of iterations of each algorithm on each benchmark function is 100, the population number is 10, and the running is repeated 50 times, and the average and standard deviation of the results are recorded. Tests show that the MSA is competitive in unimodal benchmark functions and multi-modal benchmark functions, and the results in composite benchmark functions are all superior to MVO, MFO, ALO, and GWO algorithms. This paper also uses MSA to solve two classic engineering problems: welded beam design and pressure vessel design. The result of welded beam design is 1.7252, and the result of pressure vessel design is 5887.7052, which is better than other comparison algorithms. Statistical experiments show that MSA is a high-performance algorithm that is competitive in unimodal and multimodal functions, and its performance in compound functions is significantly better than MVO, MFO, ALO, and GWO algorithms.

Chinese Innovative Patent Technologies for the Reactor Pressure Vessel

2014 ◽  
Author(s):  
Qian Shi ◽  
Tianqi Zhang ◽  
Xiang Fang ◽  
Wei Peng
Keyword(s):  
Pressure Vessel ◽  
Nuclear Power ◽  
High Performance ◽  
Power Plants ◽  
Nuclear Reactor ◽  
Reactor Pressure Vessel ◽  
Operating Pressure ◽  
Energy And Environment ◽  
Airtight Container ◽  
Reactor Pressure

There is a huge and rapid growing demand for energy in China. The developing of new energy, including nuclear energy, is an important way to solve China’s energy and environment problems. Currently, Nuclear power is playing a more and more important role in China, especially in the coastal areas where the economy is developing rapidly. The main nuclear reactor equipment is the key guarantee to nuclear safety, such as the reactor pressure vessel. With the continuous development of science and technology, the reactor pressure vessel uses more and more of advanced design methods, high performance materials and industrial-proven technologies. As an airtight container who is directly exposed to the great operating pressure of reactor, the reactor pressure vessel plays a crucial role to the safety of reactor. In the paper, by retrieving Chinese Intellectual Property Office patent libraries, 12 Chinese innovative patents for the reactor pressure vessel are introduced, containing four kinds of main technologies: closure, body, nozzle safe end and other technologies. The patent results could lead the corresponding advice to the design of the equipment effectively, to the system arrangement reasonably, and further to the reference for designing a safe nuclear power plants. The paper is to exchange the latest technological progress of reactor pressure vessel, in order to promote technological innovation in the nuclear power field.

Design, Development and Qualification of High Performance Load Sharing Composite Pressure Vessel for Aircraft Application

2013 ◽  
Vol 631-632 ◽  
pp. 50-55
Author(s):  
Bin Yu ◽  
Yang Zhou ◽  
Zhi Dong Liu ◽  
Qin Chen Jin ◽  
Wei Wei Zhao ◽  
...  
Keyword(s):  
Pressure Vessel ◽  
High Performance ◽  
Analytical Techniques ◽  
Load Sharing ◽  
Design Development ◽  
Composite Pressure Vessel ◽  
Lanzhou Institute ◽  
Safety And Reliability ◽  
Metal Liner ◽  
Aircraft Application

Load sharing metal lined composite pressure vessel(COPV) enables significant safety and reliability over those vessels with non-load-sharing metallic or non-metallic liners, The key technical challenge in developing these vessels will be to calculate the optimized liner thickness and liner elastic strain. This paper presents techniques developed at Lanzhou Institute of Physics(LIP) for the design of elastically operating metal liner COPV in terms of NET theory which modified by LIP. Five metal materials are discussed and analytical techniques for determining liner thickness are presented, selection of materials for maximizing performance and minimizing weight is discussed. L490A-COPV development is introduced, performance factor is improved from 23 Km to 29.5Km.

A High Performance Energy Analyzer for Use in Electron Scanning Microscopy

1969 ◽  
Vol 27 ◽  
pp. 14-15
Author(s):  
A. V. Crewe ◽  
M. Isaacson ◽  
D. Johnson
Keyword(s):  
High Performance ◽  
Vertical Plane ◽  
Median Plane ◽  
Electron Gun ◽  
Uniform Field ◽  
Loss Mechanism ◽  
Electron Scanning Microscopy ◽  
Sector Type ◽  
Double Focusing ◽  
Electron Energy Loss

A double focusing magnetic spectrometer has been constructed for use with a field emission electron gun scanning microscope in order to study the electron energy loss mechanism in thin specimens. It is of the uniform field sector type with curved pole pieces. The shape of the pole pieces is determined by requiring that all particles be focused to a point at the image slit (point 1). The resultant shape gives perfect focusing in the median plane (Fig. 1) and first order focusing in the vertical plane (Fig. 2).

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

Sign in / Sign up

Export Citation Format

Share Document