An Investigation of Deterministic Realistic Method for LBLOCA Mass and Energy Release Evaluation for CPR1000 NPPs

2013 ◽  
Author(s):  
Jianshu Lin ◽  
Chengjun Zhuang ◽  
Jinzhen Leng ◽  
Ting Wang ◽  
Zhenhua Zhang
Keyword(s):  
Energy Release ◽  
Conventional Method ◽  
Safety Analysis ◽  
New Method ◽  
Nuclear Technology ◽  
Complex Operation ◽  
Calculation Results ◽  
Conservative Result ◽  
Containment Pressure

With the development of nuclear technology, safety analysis methodologies were advancing from traditional conservative to more realistic approaches. For CPR1000-type NPP, the Conventional Method (CM) which employed MEDUSE, PERSEE and REFLET codes in order was still in use to evaluate the LB LOCA mass and energy release (MER). This complex operation yielded excess conservative result as well as inconvenience. Meanwhile, a deterministic realistic method (MDR) had been applied using Realistic code CATHARE GB for LB LOCA MER analysis in EPR design. In this paper, CPR1000 NPP LB LOCA MER calculation was carried out using MDR method with CATHARE GB code. Calculation results were compared with those obtained through the conventional method to assess the containment pressure margin gain. Further effort was needed to evaluate the feasibility of implementing the new method in CPR1000-type NPP applications.

Reduction of Forced Vibration Response by Optimum Balance of Linkage and Optimum Design of System

1997 ◽  
Author(s):  
She-min Zhang ◽  
Nobuyoshi Morita ◽  
Takao Torii
Keyword(s):  
Objective Function ◽  
Root Mean Square ◽  
Forced Vibration ◽  
Vibration Response ◽  
New Method ◽  
Mean Square ◽  
Design Variables ◽  
Calculation Results ◽  
Angular Velocities ◽  
Optimum Balance

Abstract This paper proposes a new method to reduce the forced vibration response of frame of linkage. It is that the root-mean-square (RMS) value of binary maximum (Bmax) of forced vibration response at a series of angular velocities is taken as the objective function, and the counterweight mass parameters of links and the stiffness factors are used as design variables. Then, it is found out that the responses are related not only to the Bmax value of shaking forces, but also to the shape of curve of shaking forces. The calculation results are compared with those of two other methods used in the reduction of forced vibration response by optimized balance of linkages, and it is shown that the new method can significantly reduce the responses of frame of linkage.

scholarly journals GPR Pulse Propagation Topography

2021 ◽  
Vol 36 (5) ◽  
pp. 596-602
Author(s):  
Veli Voipio
Keyword(s):  
Conventional Method ◽  
Ground Penetrating Radar ◽  
Pulse Propagation ◽  
New Method ◽  
Depth Range ◽  
Pulse Radiation ◽  
Ground Penetrating

In this article, I propose a new method for calculating and visualizing the pulse radiation within the depth range commonly used by Ground Penetrating Radar (GPR). The text describes the method and illustrates the propagation with several examples. One conventional method is also applied for a quick comparison. The method can be used to optimize GPR antennas and transmit pulse shapes.

scholarly journals Ultrasound assessed a new method of needle insertion at an angle of 90°to the apex of the sacral hiatus for caudal block in newborns: a randomized controlled study

2019 ◽  
Author(s):  
Shangyingying Li ◽  
Yanzhe Tan ◽  
Fei Yang ◽  
Lifei Liu ◽  
Shengfen Tu
Keyword(s):  
Failure Rate ◽  
Conventional Method ◽  
Local Anesthetic ◽  
Needle Insertion ◽  
New Method ◽  
Controlled Study ◽  
Minimal Risk ◽  
Caudal Block ◽  
Sacral Hiatus ◽  
Method Group

Abstract Background Caudal block is widely used in paediatric anaesthetic practice. Many angles for needle insertion were compared to find a optimal angle during caudal block with high successful caudal injection and minimal risk of complications. The aim of this study is to evaluate the safety and effectivity of a new method of needle insertion at an angel of 90°to the apex of the sacral hiatus for caudal block in newborns. Methods Sixty patients were included in our study, aged 0 to 28 days, posted for inguinal hernia surgery, randomly divided into two groups: a conventional method (CM) group and a new method (NM) group. In both groups, 1 ml∙kg-1 0.5% lignocaine at a rate of approximately 0.5 ml∙s-1 was given for caudal blocks after anaesthesia, and ultrasonographic observation of local anesthetic in the epidural space. Failure rate at the first attempt, puncture frequency, complications, and durations of block were recorded. Results The failure rate at the first attempt of caudal block were 16.7% in the conventional method group and 3.3% in the new method group (p<0.05). The mean time required (standard deviation) to perform needle insertion in the conventional method group was 2.6±0.5 minutes and in new method group 1.6±0.5 minutes (p<0.05). There were three cases aspirating the needle to find blood and one case to find cerebrospinal fluid in the conventional method group. The majority level which the local anesthetic reached are L1 by ultrasound imaging, 86.7% in the conventional method group and 83.3% in the new method group. Conclusion The study found that using the new method, the chance of performing a successful caudal injection can be increased, the time and the risk can be minimized compared to conventional technique. It is a safe and effective method.

scholarly journals A New Method to Detect Driver Fatigue Based on EMG and ECG Collected by Portable Non-Contact Sensors

2017 ◽  
Vol 29 (5) ◽  
pp. 479-488 ◽  
Author(s):  
Lin Wang ◽  
Hong Wang ◽  
Xin Jiang
Keyword(s):  
Principal Components ◽  
Physiological Signals ◽  
New Method ◽  
Driver Fatigue ◽  
Independent Variables ◽  
Mode Decomposition ◽  
Calculation Results ◽  
Components Analysis ◽  
Electrocardiogram Ecg ◽  
Contact Sensors

Recently, detection and prediction on driver fatigue have become interest of research worldwide. In the present work, a new method is built to effectively evaluate driver fatigue based on electromyography (EMG) and electrocardiogram (ECG) collected by portable real-time and non-contact sensors. First, under the non-disturbance condition for driver’s attention, mixed physiological signals (EMG, ECG and artefacts) are collected by non-contact sensors located in a cushion on the driver’s seat. EMG and ECG are effectively separated by FastICA, and de-noised by empirical mode decomposition (EMD). Then, three physiological features, complexity of EMG, complexity of ECG, and sample entropy (SampEn) of ECG, are extracted and analysed. Principal components are obtained by principal components analysis (PCA) and are used as independent variables. Finally, a mathematical model of driver fatigue is built, and the accuracy of the model is up to 91%. Moreover, based on the questionnaire, the calculation results of model are consistent with real fatigue felt by the participants. Therefore, this model can effectively detect driver fatigue.

Method of Examining Surface Cracks on Monocrystalline Silicon

2007 ◽  
Vol 364-366 ◽  
pp. 920-924
Author(s):  
Feng Zhou Fang ◽  
Yu Chan Liu ◽  
Qing Xiang Pei ◽  
Xiao Tang Hu
Keyword(s):  
Conventional Method ◽  
Simple Approach ◽  
Monocrystalline Silicon ◽  
New Method ◽  
Silicon Surfaces ◽  
Surface Cracks ◽  
Absorbed Energy ◽  
Nano Indentation ◽  
Micro Cracks

A new method on examining the micro cracks of monocrystalline silicon during nano indentation is proposed. It is established based on a study of the increasing rate of absorbed energy in nano indentation. This method provides a simple approach in understanding whether cracks on the silicon surfaces occur, while it is tedious in conventional method.

New discrete reactive power factor definition of the two-terminal network

2017 ◽  
Vol 65 (3) ◽  
pp. 369-373
Author(s):  
M. Siwczyński ◽  
M. Jaraczewski
Keyword(s):  
Fourier Transform ◽  
Power Factor ◽  
Reactive Power ◽  
New Method ◽  
Unitary Operators ◽  
Calculation Results ◽  
The Fourier Transform ◽  
Definition Of ◽  
Operator Decomposition

Abstract This paper describes a new method of determining the reactive power factor. The reactive power factor herein is calculated on the basis of time samples and not] with the Fourier transform of signals, like it was done previously. The new reactive power factor calculation results from the receiver admittance-operator decomposition into the product of self-adjoint and unitary operators. This is an alternative decomposition to another one, namely into a sum of the Hermitian and skew-Hemiitian operators.

NAO Robots Collaboration for Object Manipulation

2013 ◽  
Vol 332 ◽  
pp. 218-223 ◽  
Author(s):  
Alina Ninett Panfir ◽  
Răzvan Boboc ◽  
Gheorghe Leonte Mogan
Keyword(s):  
Object Manipulation ◽  
Humanoid Robots ◽  
New Method ◽  
Successful Implementation ◽  
Manufacturing Environment ◽  
Complex Operation ◽  
And Performance ◽  
The Impact ◽  
Specific Scenario

This paper proposes a new method of collaboration within a team of twoindividual NAO robots that should execute together a complex operation. The Naorobots are developed so as not only to act individually, but also to cooperatewith other robots if they cannot accomplish the operation alone. This paperpresents a case study demonstrating the integration of the humanoid roboticsplatform Nao within a cooperation application. This specific scenario ofinterest takes place in a small simulated manufacturing environment; while thetask being the storage of a big object, with different shape and weight. Thisscenario is used to observe the impact and performance that this particularteam of humanoid robots has in an industrial environment.Finally we present the successful implementation of robot – robot cooperationcapabilities inspired by human behaviour.

THE DEVELOPMENT OF A NEW METHOD OF SEISMIC VELOCITY DETERMINATION

Geophysics ◽  
1952 ◽  
Vol 17 (3) ◽  
pp. 560-574 ◽  
Author(s):  
F. P. Kokesh
Keyword(s):  
Conventional Method ◽  
Explosive Charge ◽  
Velocity Measurement ◽  
Seismic Velocity ◽  
Seismic Energy ◽  
New Method ◽  
Seismic Velocities ◽  
The Past ◽  
Velocity Information ◽  
Made In

The conventional method of making velocity surveys in bore holes is inherently expensive, time consuming, and inconvenient, and has a tendency towards non‐uniformity of results. With increasing recognition of the importance of seismic velocity information in the evaluation of seismograph data, the attention of geophysicists is turning towards means of overcoming the obstacles standing in the way of obtaining velocity information in greater volume. Considerable interest has recently been aroused in a new method of measuring seismic velocities wherein the explosive charge is placed in the hole and the seismic energy is picked up with multiple detector groups placed on the surface. Experimentation carried on during the past year indicates that the new method is quite workable. Casing perforator guns of the conventional bullet type have given results to depths exceeding 8,000 ft. with complete safety. Some experimentation with primacord as the explosive has given encouragement as a means of increasing the depth at which the method may be used. Substantial improvements have been made in the manner of obtaining the time break. This paper attempts to outline the basic problems of velocities and their measurement and describes the preliminary development that has been done thus far on the new method of velocity measurement.

Sign in / Sign up

Export Citation Format

Share Document