Reform and innovation are carried out based on the organizational management structure of state-owned enterprises, and the special mechanism of non-public enterprises is grafted into the system of state-owned enterprises. It is the first to propose to reform the management mechanism of coal mine enterprises by using the contract management mode of internal market. First, it draws on the contract management model, establishes various production departments within the coal mining enterprises, and implements the general contracting of target cost, output, salary, and number of people; second, on the basis of the internal marketization of coal mining enterprises, the implementation of the operating mechanism of the simulated legal person, the contractor Signing a legal person contract with the subcontracting unit, the production department and the district team, the district team and the employees, contracting and contracting at the same time, and granting the authority to simulate the legal person and person at all levels.

In order to find out the role of mining in the failure and water inrush of the surrounding rock of karst collapse column of the working face floor, taking the hidden karst collapse column of the floor of Geting Coal Mine as the research object, FLAC3D numerical simulation software was used to analyze and study the vertical stress field, plastic failure zone and vertical displacement changes in the mining process. The water inrush process of karst collapse column of hidden floor with different advancing distance is analyzed. The research results show that with the increasing of the advancing distance, the plastic failure range of karst collapse column is increasing, and the vertical displacement of the floor is increasing. When the plastic failure area of the coal seam floor is connected with the plastic failure area of the karst collapse column, water inrush accident of the karst collapse column of the floor is likely to occur.

为了研究建筑物下深部煤层膏体充填开采后地表高压输电线塔的危险性,以新河煤矿高压线塔为研究背景,采用理论分析、概率积分计算和现场实测相结合的方法,对新河煤矿730采区工作面的布置和开采顺序进行了优化,对730采区各工作面开采后所造成的地表移动变形进行了预计,对高压输电线和高压线塔的影响进行了预计和评价.

In order to deal with the unreasonable links of production process, time gap of production process, lack of production management, in this paper, we surveyed the whole aspects of operation procedure of excavation and the concrete situation of labor organization, based on the specific coal field investigation in Suncun Coal Mine 31119 driving face as the research object. Finally, we solved the problems in shifting of duty, coal cutting, temporary support and permanent support etc., the results show that:implementation of the internal optimization of coal enterprises is an effective way to reduce the cost and improve the efficiency of coal production.

煤矿内因火灾影响着煤矿的安全高效生产,目前煤矿内因火灾评价准确度较低,评价方法过于陈旧.针对此问题,提出一种基于集对分析-区间三角模糊数的煤矿内因火灾危险性评价耦合模型,集对分析多元联系数可以兼顾煤矿内因火灾评价中的确定性和随机性,区间三角模糊数可以描述联系数同异反结构中差异度系数的连续变化过程.运用该耦合模型与模糊综合评价方法,对鹤岗矿区内因火灾危险性进行评价,评价结果符合现场实际,并且联系数也更能直观地反映煤矿内因火灾的强弱.

为了研究采动对底板岩溶陷落柱突水的影响,在理论分析的基础上,利用数值模拟软件FLAC3D,以个葛亭煤矿地质条件为背景,分别研究了工作面不同采高、不同推进距离下的煤层和岩溶陷落柱周围围岩的应力场、位移场、渗流场和塑性破坏区的变化.结果表明:随着工作面采高的不断增加,煤层底板的塑性破坏与岩溶陷落柱上部的塑性破坏不断增加;随着工作面推进距离的不断推进接近岩溶陷落柱,当推进到陷落柱上方时,煤层底板的塑性破坏与岩溶陷落柱上部的塑性破坏达到最大并相连接,容易发生岩溶陷落柱突水事故.

为保障煤矿企业内部市场化的实施,基于国有企业组织管理架构进行改革创新,通过有效的安全监管,提出一套市场合约式监察管理方法.该方法在企业内部把安监处设置为独立的监督管理机构,各级市场主体按模拟法人合约化进行运作,将市场化手段渗透到组织管理的各个环节.这一模式对矿井生产安全进行了有效的监管制约,通过构建起的“五位一体”的安全管控体系,对风险进行预控,消除隐患,有效保证了矿井生产的安全.

Effective safety supervision guarantees coal mine safety production. However, the traditional supervision mode in Chinese coal mines cannot fully realize the synergistic and complementary effects of elements (i.e., safety inspectors) of safety supervision system, which causes information-isolated island, application-isolated island, and resource-isolated island. To overcome these deficiencies and improve the efficiency of safety supervision, a synergistic and complementary safety supervision mode (SCSSM) was explored in this study. After the applicability analysis of the synergistic and complementary management idea, this study creatively introduced the proposed idea to the safety supervision in the coal mine. On the basis of the deficiencies of the existing safety supervision mode and the advantages of synergistic and complementary management, the SCSSM was then established and its definite operation method was also provided. Finally, the new safety supervision mode was applied in Xinwen Mining Group Xin Julong Co., Ltd. with definite implementation method and comparative analysis. Results show that the new safety supervision mode uses lesser safety supervision resources than the traditional one. Meanwhile, the checking and rectification efficiency of hidden dangers and the project qualified rate are improved. Moreover, the number of accidents is reduced, which has significant safety, economic, and social benefits. This study can realize the synergistic and complementary effects of elements of safety supervision to improve the level of coal mine safety supervision and has high value of popularization and application.

针对我国煤矿企业安全监管的现状和发展趋势,为有效弥补现有煤矿企业内部安全监管模式及相关研究的不足,进行了协同互补安全监管模式的研究.通过对我国煤矿企业内部安全监管现状的分析,同时结合煤炭工业生产的发展方向,得出了目前安全监管方式的优缺点和发展趋势;基于协同论和互补增值原理,提出了协同互补管理理念,并将其引入到煤矿企业安全监管中,在现有安全监管方式的基础上提出了协同互补安全监管模式,并分析了协同互补安全监管模式的实际应用优势及意义,结果表明该安全监管方式能够弥补目前安全监管的不足以及满足发展的需求.

Purpose: In China, most quality assessments (QAs) of the high‐contrast resolution of medical computed tomography (CT) equipment is performed by subjective evaluation, which is simple but dependent on observer expertise. The purpose of this study was to compare the accuracy and degree of dispersion of evaluation results from observers with different expertise and to develop an objective, easily understandable new approach to minimize the error caused by the subjective nature of observer evaluation. The accuracy and reproducibility of this new approach was validated and compared using both subjective and objective evaluation methods. Methods: This new objective evaluation method of high‐contrast resolution was based on measurements of CT phantom images. The intensity profile of the aluminum line pairs’ (LPs’) images was extracted and quantified following the Rayleigh criterion. The interpolation method was employed to improve the consistency of the middle profile lines of each LP group for application of the Rayleigh criterion. With the introduction of a normalized margin, the accuracy of the results increased to the decimal level. Five junior observers and three QA professionals evaluated the high‐contrast resolution of three different CT scanners using the subjective method, modulation transfer function (MTF) method, and the new objective method, and the results were compared statistically. Results: The experimental standard deviations ranged from 0.4 LP/cm to 0.55 LP/cm for subjective visual inspection. The uncertainty of the expert group's results was much lower than that of the volunteer group. The experimental standard deviations of the MTF evaluation, according to both the standard deviation (SD) and point spread function (PSF) methods, were within the intervals of (0.04–0.06) LP/cm and (0.08–0.16) LP/cm, whereas that of the proposed objective evaluation method was approximately 0.02 LP/cm. The experimental data indicated that the results of the new objective evaluation were in accordance with those of the expert group's subjective evaluation and the MTF evaluation. Conclusions: In this study, the subjective evaluation results from experienced observers showed relatively less uncertainty and more accuracy than those from inexperienced observers. Furthermore, a new objective evaluation approach that is easily understood, accurate, and reproducible was developed in this study. Results acquired using this new method were comparable with those of expert groups’ subjective evaluation and MTF evaluation. Specialized QA software that integrates the steps implemented in the new method is being developed to enhance the convenience of the approach and assist observers in obtaining accurate and replicable assessment results.

Object: To investigate the statistic relationship between 5 clock positions of CTDI100 and stabilization of radiation. Method: Radiation meter and phantom are used to 12 time repeating tests on the radiation dose of a spiral CT at 5 Clock positions and then one-way ANOVA method is used to character the their difference significance of those 5 clock positions. Result: The relevant standard difference of measurements at 5 test clock positions are 0.33%(center), 0.73%(3 clock), 0.32%(6 clock), 1.00%(9 clock), 0.32%(12 clock) respectively; meanwhile the average of measurements at 3 clock is much close to that at 9 clock and no significant difference is found in one-way ANOVA test;Moreover the relative deviation between mean value of 12 Clock plus 6 Clock and 3 Clock is 0.5%. Conclusion: The tested spiral CT shows good radiation stability and 3 Clock position have equal effect with 9 clock's in CTDI100 measuring, moreover, peripheral CTDI of that can be simplified except for non-acceptance test or operational condition test.

This paper addresses the lack of research on the relationship between managers and staff on coal mine safety management, the key function of this relationship to coal mine safety production is analyzed, and the essential relationship between them is pointed out. The factors impacting on this symbiotic relationship are got from static and dynamic analysis. Static analysis indicates that this symbiotic relationship is in accordance with stable matching conditions, and correlation degree is one of the key influence factors. A logistic model of this symbiosis is set up in the dynamic analysis, and the contribution of each other is pointed out to be one of the key influence factors. These key influence factors are localized in the coal mine safety management, to propose the optimization path beneficial to symbiotic relationship, which is to be a new method to analyze the causes of coal mine accidents and to develop safety management strategies. In the empirical analysis, the causes of the coal mining accident are found out from the perspective of symbiotic relationship between managers and staff in the coal mine safety management, and more detailed, explicit and comprehensive strategies of accident prevention are proposed by optimizing this symbiotic relationship.

X、g电离辐射防护剂量监测仪表广泛用于职业人员的辐射防护和环境辐射剂量监测领域。为了对这类仪表进行准确校准，根据常用校准方法，分析校准因子测量的不确定度来源，建立相应的数学模型，对其各不确定度分量进行评定，最终得到校准因子的合成标准不确定度和扩展不确定度。

对盯头盯面和协同互补西种煤矿安监方式进行了简要的说明之后,运用TRIZ理论中的提高理想度法则,尝试建立了安监方式理想度和有害功能的相关数学模型.通过数学模型的对比分析,得出安监方式的理想适用度,以便煤矿根据自身情况做出最佳选择,并对薇种安监方式的有害功能提出合理的改进意见.

Computed laminography (CL) has a particular function in plate-type structure tomography. For CL reconstruction, slant angle of the central X-ray is an important parameter and must be calibrated accurately. A practical feasible calibration method to determine the slant angle is proposed. According to this method, a spherical phantom is fixed on the rotary table and turns a full 360° rotation. Then, image processing and the least-square fitting are performed to figure out the locus of the projection. Consequently, the slant angle is achieved in accordance with the property of the fitted ellipse. The experimental results prove that this method is easy to implement and meet the inspection requirements.

Objective To assess spatial resolution performance of various iDose reconstruction levels at Brilliance iCT 256 with brain scanning protocol under varied conditions.Methods CT images of brain were obtained using Brilliance iCT 256 and CT image quality phantom test.CT images were reconstructed using iDose 4TMand filter back projection(FBP).Modulation transfer function(MTF)of reconstructed CT images was calculated and compared.Results ①MTF of image with iDose was 1.75%—115.62% greater than FBP at equal radiation dose level.②Spatial resolution in x-O-y plane would decrease at some extend when scanning slice depth decreases.③For varied iDose levels,iDose(6)got the best MTF when slice depth was 0.9mm,while iDose(5)gained the best MTF when slice depth was 2.5mm.④No obvious difference of MTF was found when pitch varied from 0.203to 0.391while voltage,mill-ample multiple second and slice depth constant kept the same.⑤No obvious difference of MTF was found at the same mill-ample multiple second constant and different mill-ample and scanning time.Conclusion iDose can obviously increase spatial resolution at the same dose level,and spatial resolution of CT image with iDose reconstruction is not too much sensitive to pitch and lamp current to some extent. Reconstruction level should suit scanning depth in order to acquire best image quality.

Objective: To explore the feasibility of parallel computing applying in high-resolution cone beam micro-CT reconstruction and its impact on reconstruction speed. Method: Allocating video memory to projection pictures and reconstruction voxels in GPU graphic card(NVIDIA QUADRO K5 000, Video Memory 4G) with parallel computing, and allocating thread to each pixel for adjusting and filtering projection picture, and then allocating thread to each voxel for Back Projection, thus, all section reconstruction is implemented in graphic card. Result: Less than 9 minutes spent for 2 048 × 2 048 × 128 pixel matrix reconstruction, which is equal to 1/3 of data gathering time and 2% of CPU based reconstruction, under the condition that one voxel is recorded by 32 float, and each projection picture size is 2 048 × 1 536, and 1 800 projections are gained in one scanning. Conclusion: Parallel computing applied in cone beam CT reconstruction can greatly increase reconstruction speed and data gathering can simultaneously operate with reconstruction.

With a particular function in plate-type structure tomography, computed laminography (CL) has received increasing attention in industrial nondestructive testing and become an important branch of computed tomography (CT). For the reconstruction algorithm of CL, center of rotation (COR) is the most important parameter determining the reconstruction accuracy and must be located precisely. Otherwise, even a tiny error of COR will cause obvious artifacts in reconstructed images. In order to realize measurement of COR with high accuracy and efficiency, a feasible calibration method was proposed to determine the position of COR without dedicated phantoms. According to this method, when a sample fixed on the rotational stage turns around the rotational axis, the locus of the sample's projection on the imaging plane will be an ellipse. Consistent with the symmetrical property of an elliptical image, a cross-correlation operation is adopted to determine the position of COR by locating the peak value of the cross-correlation function. The computer simulation and experimental results demonstrate that this method has high accuracy, and strong anti-noise and anti-wobble ability. In particular, this method does not need a dedicated phantom to perform the calibration, but rather uses projections of the inspected sample to calculate COR directly. (C) 2014 SPIE and IS&T

有效的管理方法是保证安全的重要手段,基于危险源-隐患-事件-事故的演变过程,提出了一套全面的煤矿安全梯度式管理方法.该方法通过预防控制、纠偏控制、应急控制形成一套管理体系,以事故演变过程的逻辑关系为分割条件,形成以时间,不同发展对象,管理手段为梯度的一种创新性的管理模式.该方法有效防范危险源头,消除安全隐患,完善应急措施管理,使煤矿管理思路更加清晰,不断地向本质安全推进.

Objective To verify the reported CTDIvol value and explore dose safety managementprotocol of Philips Brilliance iCT 256 under axial scan mode with head protocolMethods A pencil dosimeter,Solidose 400 from Sweden RTI Electronics,is utilized to detect radiation dose index of phantom T6M1 64 (incompliance with IEC standard 61 223-2-6,provided by National Institute of Metrology of China)when scannedby iCT 256 under head axial protocolResults (1)Relative deviation of CTDI1 00 in the center point is about 2%and those in the peripheral 4 points are about 20% (2)Tested CTDIvol value is 5% ~1 6% greater thanreported value(3) Effective absorbing dose during one head axial scanning is about 086 mGy to 363mGyConclusions Accuracy of CTDI1 00 measurement in the center point is better than the peripheral fourpointsTested CTDIvol value might be greater than reported CTDIvol in certain conditions and supervision onaccumulated radiation dose of patient should be recommended.