China Safety Science Journal

Empirical study on relationships between safety performance of construction enterprises, social capital and dynamic capability

LI Shuquan, LIU Shijie

2017, 27(1): 1-6. doi:10.16265/j.cnki.issn1003-3033.2017.01.001

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In order to improve safety performance of construction enterprises, based on the theory of social capital and the theory of safety management, the influence mechanism of social capital on the safety performance was deeply analyzed. Taking dynamic capability as a mediating variable, a theoretical model was built for the relationships between social capital, dynamic capability and safety performance of construction enterprises. Through the data collected from 300 valid questionnaires of 98 projects, the model was verified by using factor analysis and structural equation model theory. The results show that the social capital of a construction enterprise has a significant positive effect on its dynamic capability and its safety performance, and that the dynamic capability plays a complete mediating role between the safety performance and both the structure dimension and the relationship dimension of the social capital, and it plays a partial mediating role between the safety performance and the cognitive dimension of the cocial capital. Therefore, paying attention to the cultivation of social capital of construction enterprises and strengthening the development of the dynamic capability are effective ways to improve the safety performance of enterprises.

A comparison of HFACS and 24Model in categories of unsafe acts

FU Gui, XUE Yujingyang, TONG Ruipeng, LI Jizu

2017, 27(1): 7-12. doi:10.16265/j.cnki.issn1003-3033.2017.01.002

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Unsafe acts are the direct causes of the accidents. In order to clarify and unify the definitions and judgement criteria of unsafe acts in HFACS and 24Model, a comparative analysis was used and a corresponding relationship in unsafe acts between HFACS and 24Model was established and a case study was showed to describe the application of the corresponding approach. The results show that unsafe acts defined by HFACS can be associated with the unsafe acts defined by 24Model based on the corresponding relationship,and the judgement criteria are unified by the corresponding relationship.

Analysis of factors influencing risky driving behaviors under reduced visibility condition

ZHANG Weihua, HU Zhe, FENG Zhongxiang, WANG Kun, ZHANG Xuxin, LIU Xiaofeng

2017, 27(1): 13-18. doi:10.16265/j.cnki.issn1003-3033.2017.01.003

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In order to investigate factors influencing risky driving behaviors under reduced visibility conditions,and then to improve traffic safety, two questionnaires were complied, and a survey into 314 drivers was carried out by using the questionnaires. Pearson correlation coefficient method and SEM were used to explore the relationships between risky driving behaviors and driving ability in reduced visibility, and descriptive variables. The results show that risky driving behaviors under reduced visibility conditions can be divided into wrong behaviors and fault behaviors, that gender is significantly related to wrong behaviors, risk perception would be the most significant factor affecting wrong behaviors, followed by accidents happened under reduced visibility conditions, and driving experience would be the weakest factor, and that wrong behaviors have a positive effect on fault behaviors,and risk perception has an indirect effect on fault behaviors.

Analysis of characteristics of delay in task switching for pedestrians using mobile phones

LI Hua, LI Shilun

2017, 27(1): 19-24. doi:10.16265/j.cnki.issn1003-3033.2017.01.004

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To further study the influence of cell phone use by pedestrian crossing street on traffic safety, an RTD model was built for pedestrian using a cell phone when crossing the street from perspectives of both social psychology and behavior psychology, based on SRD theory. The method of comparison before and after the study was adopted to explore the delay rates caused by the various types of cell phone uses were estimated on the basis of data obtained by means of questionnaire and field surveys. The results show that the delay rate caused by man using the cell phone when crossing the street is higher than that by women in the same age range, the delay rate caused by calling or answering the phone is higher than that by the network browsing with cell phone, and the shift from the interface of cell phone to the road condition observation causes a delay of 0.34 s on average.

Drivers' attention distribution characteristics in cutting-in process on freeway

WU Fuwei, SHAN Yan, FU Rui, WANG Chang

2017, 27(1): 25-29. doi:10.16265/j.cnki.issn1003-3033.2017.01.005

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In order to explore the influence of interfering car on attention distribution characteristics and guide new drivers to allocate their attention reasonably, real vehicle experiments in a freeway environment were carried out using eye movement instrument faceLAB 5. Eye movement data of 13 drivers were collected and recorded. And then, drivers attention distribution characteristics were analyzed when interfering car cutting in from different sides. Besides, drivers fixation transfer rules between different fixation areas were studied. The results show that in the process of interfering car cutting in,the driver mainly focuses on the front view, especially pays more attention to dynamic targets such as front vehicle and interfering car,and that the driver pays more attention to the side where interfering car cutting in.

Research on emergency evacuation of passengers with luggage from bus station

ZHANG Kairan, YANG Shupeng, HE Linxi, LONG Ying

2017, 27(1): 30-35. doi:10.16265/j.cnki.issn1003-3033.2017.01.006

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In order to study the influence of luggage types on emergency evacuation of passengers from bus stations, the driving force in the social force model was improved and methods were worked out for calculation of the tension coefficients and the exit reliability among other quantities. Simulationswere carried out with the software Anylogic for the evacuation of multiple sets of situation for different ratios,types and number of evacuees from a certain bus station in Chengdu. The results show that evacuees with luggage will adjust path according to their own conditions and situation of targeted exit, that for a given total number of evacuees and given luggage types, the evacuation time is directly proportional to the ratio of the evacuees carrying luggage to the total, that the type of pull rod box has the strongest effect on the evacuation time, and there is a positive correlation between the total number of evacuees and the evacuation time.

Research on protection of restraint system for female driver in frontal 40% offset collision

HONG Liang, FU Jingjiang, ZHOU Haichao

2017, 27(1): 36-41. doi:10.16265/j.cnki.issn1003-3033.2017.01.007

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In order to improve female driver safety in frontal 40% offset collision, firstly, a male driver restraint system model including driver seat, steering system, safety airbag, male dummy, safety belt and so on was established by simulation software MADYMO, and the model was verified by test, secondly, according to 2015 European New Car Assessment Programme, a female driver restraint system model was established by adjusting driver seat position and substituting female dummy for male dummy, finally, influences of the parameters of driver restraint system on injury to female driver were analyzed by means of the above female driver restraint system model. The results indicate that, as the steering column length decreases, the head and chest injury decrease, but the stretch bending moment of occipital bone increases,that as the length of the airbag strap at four o'clock, eight o'clock, twelve o'clock position is 180 mm, 180 mm, 270 mm respectively, the head injury criterion rises by 25.50% compared with the original value,and that as the limited load level of safety belt declines from 5.0 kN to 2.5 kN, the chest compression displacement falls by 14.44%.

Sweet potato dust explosion study based on response surface methodology

CHEN Chunyan, LONG Sihua, XIAO Guoqing, WANG Linyuan

2017, 27(1): 42-47. doi:10.16265/j.cnki.issn1003-3033.2017.01.008

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To provide a sound basis for sweet potato dust explosion prevention, experiments were carried out by using a 20 L spherical explosive device. Effects of three single factors including the particle size, concentration of dust and ignition energy on the explosion were studied. Besides, the response surface methodology was used to analyze the factors influencing the explosion of sweet potato dust by Design-Expert software,based on Box-Behnken design. The results show that there is a negative correlation between the maximum explosion pressure of sweet potato dust and the particle size, that the maximum explosion pressure increases first and then decreases with the dust concentration, and that the maximum explosion pressure increases with the ignition energy. The Box-Behnken test results show that the effect of sweet potato dust concentration on dust explosion is the greatest, followed by the ignition energy, and the effect of sweet potato dust particle size on the corresponding dust explosion is minimal.

Study on causation mechanism of extraordinary serious gas explosion accidents in coal mines

ZHANG Jinjia, XU Kaili, WANG Yantong, WANG Ben, LI Li, LI Chunhui

2017, 27(1): 48-52. doi:10.16265/j.cnki.issn1003-3033.2017.01.009

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To research fully the causation mechanism of extraordinary serious gas explosion accidents, the statistical analysis method was used for idenifying the core conditions, difference conditions and enlargement conditions of general gas explosion accidents. Then, evolution mechanism model was built for extraordinary serious gas explosion accidents after analyzing the relationship among the core conditions, difference conditions and enlargement conditions. The model was used to analyze the Chenjiashan accident. The results show that extraordinary serious gas explosion accidents were based on the core conditions of the general gas explosion accidents, which interact with difference condition and enlargement condition, and that the prevention of extraordinary serious gas explosion accidents requires perfecting the laws and regulations, and the enterprises to attach great importance to establishing their risk pre-control system of human-machine-environment-management.

Experimental study and numerical simulation of effect of coal particle size on dust cloud explosion

HE Yanru, ZHU Shunbing, LI Mingxin, WU Qianqian, CAO Yuan, ZHOU Zheng

2017, 27(1): 53-58. doi:10.16265/j.cnki.issn1003-3033.2017.01.010

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To analyze the explosion characteristics of coal dust, the effects of particle size and concentration of coal on the maximum explosion pressure , explosion index were investigated by using a 20 L explosive ball test device and the Fluent software. The results show that in the experimental environment 293-303 K,when the ignition energy is 10 kJ,with the increase of dust concentration, the maximum explosion pressures of three different clouds of coal dust, particle sizes of which are 26,73 and 115 μm respectively, rise first and drop afterwards , reaching their maxima at 350 g/m³, that at the same dust concentration, the maximum explosion pressure and the explosion index all increase with the decrease of the particle size , that the particle size of 26 μm, concentration of 350 g/m³ coal dust can maintain a relatively stable state during the period of 60-120 ms,and the diffusion reaches a relatively uniform state in around 60 ms ,that after the explosion, the highest temperature in the combustion zone reached 2 060 K, and the unburned area temperature increased from 300 K to 375 K, and that 26 μm dust cloud explosion hazard is rated gradeⅡ,73 and 115μm dust clouds explosion hazards are rated gradeⅠ.

Research on reliability of corroded pipelines based on step-down-stress accelerated life testing

LUO Zhengshan, BI Aorui

2017, 27(1): 59-64. doi:10.16265/j.cnki.issn1003-3033.2017.01.011

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In order to ensure the safe operation of oil and gas pipelines, the reliability of corrosion pipelines' life was studied. Firstly, based on the failure mechanism of the pipelines, corrosion rate sample data in different temperature environments were obtained by using the step-down-stress accelerated life testing method. Secondly, a data conversion model was built by using the acceleration factor and inverse power law equation. The corrosion rate data were converted into failure time data and truncated as the input of the model. Then quasi-samples with unknown parameters were obtained. Thirdly, three parameters of Weibull distribution were estimated by means of those samples, and the reliability function of pipelines was obtained with temperature and time as the independent variables. Finally, pipelines , which were made of N80 steel and operated in H₂S/CO₂ system were taken as examples to prove the reliability of the method. The results show that by using the method ,the test time can be shorten greatly, and the pipelines’ life can be predicted accurately.

Application of modified empennage residual error GM(1,1) model in prediction of pipeline corrosion

ZHANG Xinsheng, ZHAO Mengxu, WANG Xiaowan

2017, 27(1): 65-70. doi:10.16265/j.cnki.issn1003-3033.2017.01.012

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In order to solve the problem that the corrosion of the offshore oil and gas pipeline is accelerated by the damage to the outer surface, the paper was aimed at building a modified empennage residual error GM(1,1) model based on the traditional gray model to predict the residual life of pipelines. Firstly, a gray differential equation was established after testing the smoothness and quasi-exponential regularity of pipeline corrosion depth data are tested. Secondly, a complete modified gray model of submarine pipeline corrosion was obtained by calculating the gray differential equation parameters with a least square method and correcting the residual error through predicting the corrosion depth. The model was used to predict the remaining life of a certain test submarine pipeline section as an example. The results show that the relative error of gray model prediction is 36.7% and that of forecasting GM (1,1) is 3.79%, so the prediction accuracy is higher and the life prediction is more reasonable.

Study on technique for controlling gas abnormal effusing of working face for coal seam poor in gas under extremely intensive mining condition

WANG Chunguang

2017, 27(1): 71-76. doi:10.16265/j.cnki.issn1003-3033.2017.01.013

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In order to solve the problems of sudden increase in gas emission during coal cutting, the amount of gas emission continues to increase in goaf, and gas exceeding seriously at the upper corner under "U" type ventilation in the working face for coal seam poor in gas under extremely intensive mining condition. Tashan coal mine was taken as an example, and experiments were carried out to study the inhibition effect of coal seam water injection on gas emission during the fall of coal. A combined control technique for tnm-staging evacuation in the dedicated gas roadway of goaf was developed. The results show that the sudden increase of gas emission can be controlled by using the technology of coal seam water injection during mining, that the maximum volume fraction of gas in return air can be lowered to 0.58%, that U+I-type ventilation of natural evacuation is established during incipient mining in dedicated gas roadway, and the share of windblown gas reaches 30 m³/min, and that the gas emission is raised to 40 m³/min through inclosed vacuum drainage during the middle and later periods of mining.The technology controlled gas density of working face under critical value 0.6% during mining time, which protected mining face with high efficiency and safety.

Prediction of landing distance for civil aircraft

WEN Ruiying, WU Bo, CHU Shuanglei, WANG Hongyong

2017, 27(1): 77-81. doi:10.16265/j.cnki.issn1003-3033.2017.01.014

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In order to prevent aircraft from running out of runway, the paper was aimed at predicting the aircraft landing distance by means of an SVM model. B737-800 was taken as the reference type on the basis of considering specific factors influencing the distance, namely those relating to the airport, the weather and the aircraft. The operation data were collected by using Boeing LAND software. The radial basis function (RBF) kernel function was chosen by selecting the minimum error and the optimal accuracy. The best penalty function c and the kernel function parameter g were optimized by using grid parameters, genetic algorithm and particle swarm optimization algorithm. The results show that the prediction of landing distance conforms with the measured data, the maximum absolute error is 20 meters, and the maximum relative error is 1%.

Application of set pair analysis in evaluation of failure probability of submarine pipeline

SHU Chang, YAO Anlin, LIU Shuaifeng, XU Taolong, WANG Hui

2017, 27(1): 82-87. doi:10.16265/j.cnki.issn1003-3033.2017.01.015

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For the sake of analyzing submarine pipeline failure possibility, an evaluation index system was established. The index system consists of 21 factors of 6 aspects, including corrosion, third party damage, environment, misoperation, pipeline itself and safety management. weights of the indexes were determined by using the modified comprehensive weight method which combine the entropy weight method with the excessive multiples weight method. Lastly, the failure possibility evaluation method of submarine oil and gas pipeline based on set pair analysis was adopted to evaluate 5 different pipe sections in a certain sea. The maximum connection degrees of each pipe section were determined according to the evaluation scores to judge the failure possibility. The results show that the processing result of index score by set pair analysis conforms with the actual situation, and set pair analysis can be used in evaluation of failure probability of submarine pipelines.

Coal and gas outburst early-warning technology and application based on AHP and extension theory

GUO Deyong, HU Jie, WANG Yankai

2017, 27(1): 88-92. doi:10.16265/j.cnki.issn1003-3033.2017.01.016

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To realize coal and gas outburst intelligent early-warning which based on the AHP and extension theory, and guided by VB and ArcEngine components, the system structurecomposed of data acquisition, query and early warning modules was designed, and a client-side software system was also programmed. According to basic parameters of thecoal mine working face, and the index measured on coal face predicting the coal and gas outburst, the coal and gas outburst early warning technology system was constructed and applied to the S2206 Working Face of Lu'an Yuwu Mining in Shanxi province. It isindicated that the early warning result conformed to the actual working face.

Experimental study on seepage of gas from fractured coal under stress loading and unloading conditions

TIAN Kunyun, QI Lei

2017, 27(1): 93-97. doi:10.16265/j.cnki.issn1003-3033.2017.01.017

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In order to explore the seepage laws of gas(methane) from different bedding direction fractured coal samples under the same stress loading and unloading condition, experiments were carried out on the parallel and vertical bedding direction raw coal samples employing a self designed and modified three stress axis gas penetration simulation experiment device. The results showed that in the stress loading process, both the permeability values of the two coal samples decreased with the increase of effective stress, the values decrease by 99.01% and 80.49% respectively when the effective stress was loaded to the maximum value. In the stress unloading process, the values increased with the decrease of effective stress and the change was small at the beginning of unloading, the values recovered to 87.45% and 68.8.5% of the minimum values respectively when the effective stress unloaded from 11.65 to 8.98 MPa, that the increased amplitude of the values are 736.78% and 99.67% when the effective stress unloaded to 4.98 MPa, and that the increase amplitude of the value of parallel bedding direction coal sample was much bigger under the same unloading condition.

Evaluation of gas prevention and control system based on unascertained measurement model

XIAO Peng, DING Yi, LI Shugang

2017, 27(1): 98-103. doi:10.16265/j.cnki.issn1003-3033.2017.01.018

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According to the characteristics of unascertained information in coal mine gas prevention and management system, factors affecting coal mine safety control were ientified to reflect the overall status of coal mine gas disaster prevention and control, and a safety evaluation index system of mine gas prevention and management system was established. Based on the unascertained measure theory and method, according to the uncertainties in the index system, weighs of the indexes were determined by using the analytic hierarchy process, and the unascertained measure vector of each evaluation index was quantitatively analyzed, an unascertained measure function vector model was built,according to the confidence of recognition results, and the evaluation level was determined .The model was applied to a certain coal mine in Xinjiang.The practice shows that the model can fully utilize the uncertain information contained in the research question, combine qualitative analysis with quantitative analysis, and be used to otain evaluation results conforming to the reality.

Risk assessment and inhibition of thermal runaway in vinyl acetate polymerization system

JIN Manping, ZHU Yunfeng, ZHANG Jing, SUN Feng, XU Wei, SHI Ning

2017, 27(1): 104-109. doi:10.16265/j.cnki.issn1003-3033.2017.01.019

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In order to evaluate the thermal runaway risk of the VAC polymerization system and to develop an emergency inhibition methodology, an experimental study was made by using an adiabatic calorimeter VSP2. The associated runaway risk was evaluated and the proper adding time and amount of the inhibitor were determined based on the ZHA hazard analysis method. The results show that the risk is second to the most dangerous, the ΔT_ad is over 100 ℃,and TMRad is around 10 min, and that the runaway could be effectively suppressed by the addition of solvent (no less than 20% VAC in mass) when the system temperature is below 73 ℃.

Variation routine of surface infrared radiation temperature of composite coal rock in fracture under load

LI Xin, YANG Zhen, DAI Shuang, QIU Bin, XIN Yuan

2017, 27(1): 110-115. doi:10.16265/j.cnki.issn1003-3033.2017.01.020

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In order to realize the non-contactprediction of the coalrock dynamic disaster by infrared radiation and ensure coal mine safety, the evolution characteristics of surface infrared radiation temperature of composite coal rock and mudstonesample during deformation and fracturing were studied by infrared thermal imager. Fitting equation between temperature, stress and strain of coal, roofslab,floorslab and mudstone were established. The results show that there are thermoelastictand frictional hea effects during continuous loading tests of both samples.The physical mechanism is the same. Infrared radiation precursor of composite coal rock in fracture instability has been manifested as a rise in step. When the loading rate increasing, the temperature increases also.The temperature changes and stress or strain have a strong positive linear correlation. Infrared radiation temperature precursor of mudstone has been manifested as a trend of step and type spurt upward. The temperature change is more obvious than the coal rock. The correlation is slightly higher than the composite coal rock.

Slope stability estimation model based on HIOA-MK-TCRVM

LUO Yiyong, YAO Yibin, ZHANG Liting, ZHOU Shijian

2017, 27(1): 116-121. doi:10.16265/j.cnki.issn1003-3033.2017.01.021

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In order to improve the accuracy and computational efficiency of slope stability estimation, an MK-TCRVM based on HIOA (HIOA-MK-TCRVM)was constructed. Then the HIOA-MK-TCRVM was applied to the field of rock slope and soil slope stability estimation. At the same time, other slope stability estimation models (they were based on single kernel two classification relevance vector machine, and support vector machine (SVM) among other algorithms) were established, and a comparison was made between the models and the HIOA-MK-TCRVM for the accuracy and the sparsity. Finally, the effect of optimizing MK-TCRVM parameters based on HIOA was analyzed. The experimental results show that the accuracy rates of HIOA-MK-TCRVM for the training set and the test set are 100%, which are better than those of the other methods. The proportion of the correlation vector of HIOA-MK-TCRVM to the number of training samples is less than 25%,which confirms that HIOA-MK-TCRVM has an obvious sparse effect. After the genetic operation is added to the HIOA algorithm, the evolution speed and the optimal solution of HIOA are improved.

Influence of plate inclination angle on energy absorption characteristics of pre-folded edge tube anti-scour and supporting device

MA Xiao, PAN Yishan, ZHANG Jianzhuo, XIAO Yonghui

2017, 27(1): 122-127. doi:10.16265/j.cnki.issn1003-3033.2017.01.022

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In view of poor impart resistance ability and failure due to damage in rockburst of the anti-scour and supporting equipment, the paper was aimed at developing a new kind of anti-scour and supporting device with great energy absorption performance .After numerical simulation of ordinary square tube axial compression, a pre-folded edge tube anti-scour and supporting device was designed and its energy absorption performance was studied by carrying out a finite element simulation. The effect of the plate inclination angle on the performance was studied. An energy absorption performance comparison was made between the pre-folded edge tube and the square tube. Finally, the best plate inclination angle of pre-folded edge tube anti-scour and supporting device was verified by carrying laboratory experiments. The results show that the pre-folded edge tube anti-scour and supporting device has the best energy absorption perormance.

"AHP+entropy weight method" based CW-TOPSIS model for predicting rockburst

ZHU Feng, ZHANG Hongwei

2017, 27(1): 128-133. doi:10.16265/j.cnki.issn1003-3033.2017.01.023

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Seeing that proper weights are difficult to be attached to the indexes in the existing rockburst disaster assessment system, the paper was aimed at developing a combination weighting algorithm based on coupling AHP method with entropy weight method. To ensure the consistency between subjective-and-objective weights and preference coefficients, an optimization decision model was built by introducing Lagrange function, by which the proper CW of each index can be obtained and the factors influencing predicting rockburst can be ranked in order of influence . On the basis of the basic theory of TOPSIS, the CW-TOPSIS model for comprehensive evaluating rockburst was built for analyzing closeness degree of samples and predicting rockburst ranking level. The model was applied to the panel 83003 in Laohutai coal mine .The panel was predicted to have a medium risk of rockburst and the tectonic stress would be the leading factor causing the rockburst. The prediction conforms with the reality.

Empirical study on competency factors of civil aviation security personnel

WANG Yonggang, SHENG Bingnan, XU Chao

2017, 27(1): 134-139. doi:10.16265/j.cnki.issn1003-3033.2017.01.024

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In order to explore the competency factors of civil aviation security personnel, based on the existing competency models, the competency factors of civil aviation security personnel were collected by referring to literature,analyzing the duties of security personnel and structured interviews. A questionnaire survey was carried out and data were collected. A competency model was built for civil aviation security personnel through the factor analysis. The model includes 4 first-class indicators consisting of knowledge, ability, personal characteristics and values, and 23 second-class indicators, such as laws and regulations, ability of analysis and judgment, self-confidence and safety awareness and others. The validity of the model was verified by using the structural equation model. The results show that among the four factors influencing the competency of civil aviation security personnel, the ability factor has the greatest influence on the competency, and the others are the knowledge, personal characteristics and values in sequence.

Research on effects of error management climate on employees' safety behavior in construction firms

RUAN Guoxiang

2017, 27(1): 140-145. doi:10.16265/j.cnki.issn1003-3033.2017.01.025

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For the sake of exploring the effect mechanism of EMC on employee's safety behavior, a theoretical model was built by introducing mediate variables including upward communication, lateral communication, and safety self-efficacy. A questionnaire survey was carried out into workers in 18 construction enterprises in Yantai. 457 effective sample data were obtained through the survey. Multiple liner regression models were built to handle the data. The results show that the employee's perception of EMC has a significantly positive influence on upward communication, lateral communication, safety self-efficacy and safety behavior, that upward communication, lateral communication and safety self-efficacy have a significantly positive influence on safety behavior, and that construction enterprises can prompt the employees' safe behavior quality by building a positive EMC.

Influence mechanism of team-level transformational leadership on individual-level safety outcomes: an empirical study based on oilfield company

LI Yangxia, WU Xuanna, LI Feng

2017, 27(1): 146-150. doi:10.16265/j.cnki.issn1003-3033.2017.01.026

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To further explore the relationships among the transformational leadership, the safety climate and the safety outcomes, a multi-level mediation model was built on the basis of the previous findings. A questionnaire survey was carried out into 670 crude oil production workers of 67 groups in a certain oilfield company in China. The model was tested by using the data obtained from the survey and the SEM method. The results show that the transformational leadership has a positive effect on the safety climate on the team level, that the safety climate has a positive effect on the safety outcomes indicated by near-miss and injures on cross level, and that the transformational leadership has a positive effect on the safety outcomes through the safety climate.

Study on effects of financing constraints on coal enterprises safety investment

ZHENG Yi, YIN Yuwen, YING Liying

2017, 27(1): 151-156. doi:10.16265/j.cnki.issn1003-3033.2017.01.027

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To contribute to realizing the coal enterprise work safety, solving the problem of inadequate safety investment, effects of financing constraints on coal enterprises investment were studied, by using the empirical research method, based on the date on coal enterprises listed companies from 2011 to 2015. The results show that there is a negative correlation between the degree of financing constraints on coal enterprises and safety investment ,that there is a negative correlation between the short-term borrowing level of coal enterprises and safety investment, that there is no direct relationship between enterprise long-term borrowing level and safety investment, that there is a positive correlation between coal corporate safety investment and internal cash flow, and that improving the enterprise financing environment contributes to enterprise safety investment.

Research on method for predicting risk of aircraft flight conflict in airport terminal

GAO Yang, WANG Xiangzhang, ZHENG Dibin

2017, 27(1): 157-162. doi:10.16265/j.cnki.issn1003-3033.2017.01.028

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In order to accurately predict the flight conflict risk of aircraft in the airport terminal and use the low-altitude airspace resources to the full, a model was built for predicting risk of aircraft flight conflict in airport terminal after integrating the transport aircraft trajectory model considering the acceleration and the random trajectory model of general aircraft. The model was applied to a certain airport in China. A program was complied,by using the C language,for the simulation.The aircraft trajectories within 20 km range of the terminal centered on the runway were simulated by computer. The risk of flight conflict was predicted for different traffic zone settings. The activity areas for general aircrafts near the terminal were determined by the computer simulation. The result shows that the flight conflict risk between the general aircraft and the transport aircraft is low than 2×10^-5 for a aircraft taking-off or landing and meets the acceptable level of safety, when the flying height is limited to 1 000 m and the low-altitude airspace is designated as a monitoring airspace under no control.

Modeling living pattern of China village and township residents and its application in earthquake fatality estimation

JI Peixi, MENG Yaobin, YE Wan

2017, 27(1): 163-168. doi:10.16265/j.cnki.issn1003-3033.2017.01.029

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Human fatality or injury in a public safety incident depends on human exposure, i.e., the extent tempo-spatial distribution of the human and that of the hazard overlap to. Building models for human living pattern will give a scientific base for the prevention of public safety risk and emergency management thereof. This paper reports the China Human Activity Pattern of Rural Residents Survey (HAPRRES) conducted nationwide, including the surveyed activity time parameters, the method to model them, and the simulation technique to represent the population tempo-spatial distribution thereby. For crop farmers, the daily working schedule, indicated by the daily number of work spells, should be determined firstly, and other parameters, pertaining to each working schedule, should be modeled separately. The models so built are found to be relevant and robust. Using the simulated human tempo-spatial distribution, this paper fits a model to fatality data in China earthquakes and reveals that the fatal probability for the people in sleep and the people who are awake differ considerably in death rate, which confirms the significance of differentiating the conscious states of people.

Pipeline integrity assessment based on combining magnetic flux leakage detection with grading evaluation

YU Yang, LIU Dejun, SUN Dongxu

2017, 27(1): 169-174. doi:10.16265/j.cnki.issn1003-3033.2017.01.030

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To ensure the safe operation of buried oil and gas pipelines, a pipeline integrity assessment model was built based on combination of the technology of magnetic flux leakage detection and grading evaluation. Then the specific implementation process of the model was discussed in detail. The model was divided into two stages, a detection stage and an evaluation stage. The former included selecting the pipe segment to be evaluated according to the pipeline risk assessment and high consequence area evaluation results, pigging, launching detector, detection data analysis and testing results verification. The latter included three levels of evaluation methods. Evaluation equation was taken as the lowest level of evaluation and the finite element analysis method was used as the highest level evaluation method. The detection data obtained by the detection stage was transmitted to the evaluation stage in this model. The model was used to assess the integrity of a certain products pipeline in China. The results show that the model is suitable for data transmission and all defects detected are in a safe state.

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