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排序方式: 共有56条查询结果,搜索用时 15 毫秒
1.
Type 17-4 PH martensitic precipitation-hardenable stainless steel, having a combination of high mechanical properties and
good corrosion resistance is widely used in aerospace, chemical, and petrochemical and food industries This alloy has a high
resistance to stress corrosion cracking but age hardening treatment, increases its sensitivity to stress corrosion cracking.
There are several works investigating the influence of different aging treatments on the microstructure, mechanical properties
and corrosion resistance of 17-4 PH steels, however there are little works studying the simultaneous effects of aging treatments
and molybdenum content on corrosion properties of these steels. In this research, the effect of molybdenum on stress corrosion
cracking resistance of 17-4 PH alloy using U-bend samples in chloride solutions, as well as its effect on passivity, has been
investigated. Quantometer, Scanning Electron Microscope(SEM) and potentiostat were used to determine the chemical composition,
microstructure and anodic polarization behavior of the alloys. It is found that molybdenum has a useful effect on stress corrosion
cracking resistance under the peak aged conditions, and this is because of development of delta-ferrite phase by increasing
the molybdenum content and subsequently decreasing the strength of the alloy. 相似文献
2.
Alireza Sharafi Majid Aminnayeri Amirhossein Amiri 《The International Journal of Advanced Manufacturing Technology》2012,63(1-4):209-214
Control charts are intended to aid quality practitioners in monitoring whether a change has occurred in a process. When a control chart indicates an out-of-control signal, it means that the process has changed. However, control chart signals do not indicate the real time of process changes; so estimators are applied to indicate the time when a change in the process takes place, which is referred to as the change point. This paper provides a maximum likelihood estimator to identify the real time of a step change in phase II monitoring of binary profiles, in which the quality of a process is characterized by a logistic regression between the response and predictor variables. Simulation studies are provided to evaluate the effectiveness of the change point estimator. 相似文献
3.
4.
An engagement mode involves a subject (e.g., a user of information technology, or IT) who is engaged in an activity with an object in a certain manner (the mode). The purpose of this study is to develop a general model of engagement modes that may be used for understanding how IT-related activities are shaped by properties of the user and the IT object. A questionnaire involving items on IT engagement and the experience of flow was administered to 300 participants. The results supported an engagement mode (EM) model involving 5 different engagement modes (enjoying/acceptance, ambition/curiosity, avoidance/hesitation, frustration/ anxiety, and efficiency/productivity) characterized on 3 dimensions (evaluation of object, locus of control between subject and object, and intrinsic or extrinsic focus of motivation). The flow experience follows from a balance between enjoying/ acceptance and efficiency/productivity propelled by ambition/curiosity. The EM model could provide a platform for considering how IT users, IT applications, and IT environments should work together to yield both enjoyment and efficiency. Actual or potential applications of this research include designing IT training programs on different levels of specificity. 相似文献
5.
This article studies a no-wait two-stage flexible flow shop scheduling problem with setup times aiming to minimize the total completion time. The problem is solved using an adaptive imperialist competitive algorithm (AICA) and genetic algorithm (GA). To test the performance of the proposed AICA and GA, the algorithms are compared with ant colony optimisation, known as an effective algorithm in the literature. The performance of the algorithms are evaluated by solving both small and large-scale problems. Their performance is evaluated in terms of relative percentage deviation. Finally the results of the study are discussed and conclusions and potential areas for further study are highlighted. 相似文献
6.
Grimshaw P Calo JM Shirvanian PA Hradil G 《Industrial & engineering chemistry research》2011,50(16):9525-9531
An investigation is presented of nickel electrodeposition from acidic solutions in a cylindrical spouted electrochemical reactor. The effects of solution pH, temperature, and applied current on nickel removal/recovery rate, current efficiency, and corrosion rate of deposited nickel on the cathodic particles were explored under galvanostatic operation. Nitrogen sparging was used to decrease the dissolved oxygen concentration in the electrolyte in order to reduce the nickel corrosion rate, thereby increasing the nickel electrowinning rate and current efficiency. A numerical model of electrodeposition, including corrosion and mass transfer in the particulate cathode moving bed, is presented that describes the behavior of the experimental net nickel electrodeposition data quite well. 相似文献
7.
Mohammad Madani Peyman Abbasi Ghasem Zargar Pezhman Abbasi 《Petroleum Science and Technology》2017,35(23):2179-2186
Development of reliable and accurate models to estimate carbon dioxide–brine interfacial tension (IFT) is necessary, since its experimental measurement is time-consuming and requires expensive experimental apparatus as well as complicated interpretation procedure. In the current study, feed forward artificial neural network is used for estimation of CO2–brine IFT based on data from published literature which consists of a number of carbon dioxide–brine interfacial tension data covering broad ranges of temperature, total salinity, mole fractions of impure components and pressure. Trial-and-error method is utilized to optimize the artificial neural network topology in order to enhance its capability of generalization. The results showed that there is good agreement between experimental values and modeling results. Comparison of the empirical correlations with the proposed model suggests that the current model can predict the CO2–brine IFT more accurately and robustly. 相似文献
8.
Ultrasound elastography: a dynamic programming approach 总被引:1,自引:0,他引:1
Rivaz H Boctor E Foroughi P Zellars R Fichtinger G Hager G 《IEEE transactions on medical imaging》2008,27(10):1373-1377
9.
Mohammad Sadegh Sharafi Mohammad Jamialahmadi 《Petroleum Science and Technology》2016,34(15):1333-1339
In this study an existent mathematical model was implemented to investigate the effect of dispersion on oil recovery of core-flood experiments in process of viscoelastic polymer flooding as a tertiary stage of enhanced oil recovery. Discretized forms of equations of pressure, saturation, and concentrations were obtained and solved by implicit in pressure and explicit in saturation and concentrations with considering effect of time step on solution. Furthermore, a new procedure was presented to solve polymer concentration equation by trial and error. The results showed that dispersion phenomenon reduces displacement efficiency of viscoelastic polymer flooding. 相似文献
10.
Sasanpour P Shahmansouri A Rashidian B 《Journal of nanoscience and nanotechnology》2010,10(11):7179-7182
Third order nonlinear effects and its enhancement in gold nanostructures has been numerically studied. Analysis method is based on computationally solving nonlinear Maxwell's equations, considering dispersion behavior of permittivity described by Drude model and third order nonlinear susceptibility. Simulation is done by method of nonlinear finite difference time domain method, in which nonlinear equations of electric field are solved by Newton-Raphshon method. As the main outcomes of third order nonlinear susceptibility, four wave mixing and third harmonic generation terms are produced around gold nanostructures. Results of analysis on different geometries and structures show that third order nonlinearity products are more enhanced in places where electric field enhancement is occurred due to surface plasmons. Results indicates that enhancement of nonlinearities is strongly occurred in structures whose interface is dielectric. According to analysis results, nonlinear effects are highly concentrated in the vicinity of nanostructures. Hence this approach can be used in applications where localized ultraviolet light is required. 相似文献