气藏采收率影响因素研究与启示——以靖边气田A井区为例

以鄂尔多斯盆地靖边气田A井区为例，采用单因素相关分析和数值模拟方法，对比研究了井网控制程度、储层物性及地层废弃压力对气藏采收率影响及其主次关系。结果表明，井网控制程度是影响采收率的首要因素，井网控制程度每增加10%，采收率提高8.5%；渗透率是影响采收率的重要因素，渗透率每增加10%，采收率平均增加6%；废弃压力对采收率亦有较大影响，废弃压力每降低10%，采收率可提高1.6%。三者对采收率影响综合排序为：井网控制程度>储层物性>废弃压力。分析认为，渗透率是储层固有属性，很难从根本改变；而废弃压力受井口外输压力和增压开采成本制约，降低幅度有限。因此，优化井网及增加井网控制程度是提高气藏采收率的有效途径。研究成果具有实践意义，可为改进气田开发方式和提高气藏采收率提供参考。     

高海拔地区大型硫精砂制酸装置设计及运行情况简介

对高海拔地区400 kt/a硫酸生产装置工艺进行了比选,介绍青海硫精砂焙烧制酸系统工艺流程和设备,对试生产情况和存在的问题进行了详细分析;装置回收高低温位废热,通过废热锅炉产出蒸汽进行发电;回收烧渣中的铜、钴、锌等有价金属后产出的铁精粉可直销钢铁厂。     

电解金属锰(湿法)生产危险因素识别及防范措施

在电解金属锰湿法生产和作业过程中,由于生产现场存在诸多不安全行为、物的不安全状态和各种管理缺陷等,将引发各类伤亡事故,对员工造成不必要的伤害。因此采用预先危险性分析法,对电解金属锰生产工艺、成品、危险有害物质、人员作业方式以及在现场综合管理中存在的危险有害因素进行识别与分析,并提出可行的防范措施,有效防止各类事故的发生,确保安全生产。     

从节能的角度看III级洁净手术室的系统形式

洁净手术部建设中对于III级手术室的空调系统形式一般的设计为一拖三的形式，很明显这不是避免交叉感染的最好形式，有悖于建造洁净手术部来降低手术感染风险的初衷。通过对投资以及运营方面的比对来探讨新的系统形式     

钢木组合整体装拆式楼梯踏步模板工艺探索

结合钢木组合整体装拆式楼梯踏步模板工艺的特点,对该工艺的使用范围作了介绍,着重探讨了该工艺的施工流程及操作要点,并归纳了该工艺的质量、安全及环保措施,通过分析工程案例,指出该工艺具有良好的经济和社会效益。     

Urban rail track condition monitoring based on in-service vehicle acceleration measurements

Condition monitoring of railway tracks is essential in ensuring the safety of railway systems. Traditional track recording vehicles (TRV) can only carry out the track inspection in the midnight after all the service vehicles are off duty. One track line can be inspected only once or less in a month. The severe track condition degradation cannot be detected timely and there is potential safety hazard for the railway system. Therefore, the track condition monitoring based on in-service vehicle has been paid more attention in the recent years. In this paper, the track condition monitoring based on the bogie and car body acceleration measurements is presented. The track alignment information which can be derived from the bogie and car body sensor is investigated by using a mathematical model and the frequency response analysis. The track irregularities can be estimated by using the bogie and the car body acceleration sensors. The acceleration signals are preprocessing with a DC filter and a low pass filter. After that, the track alignments are obtained by double integrating the signals. Field tests are carried out in Shang Hai metro Line 1 for demonstrating the effectiveness of the proposed track inspection system.     

Realization of active power filter based on indirect current control algorithm using Xilinx system generator for harmonic elimination

Realization of active power filter with Model Based Design approach is presented in this paper. The approach adopts different modeling platforms as well as selection of proper hardware for step wise verification and testing. The active power filter model is developed using the Matlab/Simulink platform for single phase. The efficiency of the control algorithms such as synchronous detection method and indirect current control for active power filter is analyzed. Efficient control algorithm is developed by Xilinx system generator which is incorporated into Simulink as Xilinx tool box. Xilinx system generator provides a virtual platform for easy and effective design of the required system models in FPGA (field programmable gate array) design environments. Optimized automatic VHDL code is generated for the control algorithm which is simulated using ISE 13.2 for the generation of switching signals for the control of IGBTs of the active power filter. Suitable compensation signal is generated from the active power filter for the better elimination harmonics to improve the power quality. THD is reduced to a considered value which is able to satisfy the limits of the IEEE standard.     

八钢2500m3高炉长寿管理措施

八钢A高炉受原燃料的影响，导致炉况顺行变差。通过对A高炉参数的监控和分析，在操作上抑制钛的析出，及时排出有害元素，活跃炉缸，优化炉前作业的参数，及时更换变形的风口中套来恢复送风参数，对侧壁热耦测量的高温区域采取压浆和冷却参数调整等相应的措施，实现了高炉顺行。     

Solution-processed ytterbium oxide dielectrics for low-voltage thin-film transistors and inverters

High permittivity (high k) metal-oxide thin films fabricated via solution processes have recently received much attention for the construction of low-operating voltage and high-performance thin-film transistors (TFTs). In this report, amorphous ytterbium oxide (Yb₂O₃) thin films were fabricated by spin coating and their applications in TFTs were explored. The physical properties of the solution-processed Yb₂O₃ thin films processed at different annealing temperatures were systematically investigated using various characterization techniques. To explore the feasibility of the Yb₂O₃ thin films as gate dielectrics for oxide TFTs, In₂O₃ TFTs based on Yb₂O₃ dielectrics were integrated. All the devices could be operated at 3 V, which is critical for the applications in portable, battery-driven, and low-power electronic devices. The optimized In₂O₃/Yb₂O₃ TFT exhibits high electrical performances, including field-effect mobility of 4.98 cm²/V s, on/off current ratio of ~ 10⁶, turn-on voltage around 0 V, and subthreshold swing of 70 mV/decade, respectively. To demonstrate the potential of In₂O₃/Yb₂O₃ TFT toward more complex logic application, the unipolar inverter was further constructed.     

BYJ18-21/35带压作业机的研制

BYJ18-21/35带压作业机是在国外同类成熟带压作业机结构的基础上,结合国内油田实际井况而研制的带压作业装备。介绍了该带压作业机的主要技术参数、关键部件、工作原理、结构特点及试验情况等。试验情况表明,该作业机具有整体配套性好、功能齐全、各部件协调性高和操作灵活可靠等特点,完全能够满足国内油田的实际作业需要,具有广阔的应用前景。