大水深测量校正方法研究与应用

水库水深测量精度直接关系到水库的防洪安全与蓄水兴利。现有回声测深仪无法应对大水深施测的情况，且测量受到水库水温分层影响。利用回声测深仪配合校正标进行大水深测量的校正方法，能够精确检测到回声测深仪水深测量的误差及差值、系统延时问题等，通过与各级校正标的真值比较、修正，能使测值近似真值,且使误差控制在容许范围内。介绍了水深校正标基本原理、操作方法和步骤以及在水库测深中的应用。     

Stress-deformable state of isotropic double curved shell with internal cracks and a circular hole

This work is devoted to the stress–strain state of isotropic double curved shell with defect system. The construction is weakened by two non-through thickness (internal) cracks of different length and by a circular hole located between cracks. In this study we use the line-spring model. Within the framework of this model cracks are modeled as mathematical cuts of shell’s middle surface. This leads to a two-dimensional problem. The problem is reduced to a system of eight boundary integral equations. To ensure the uniqueness of solution an additional equation is added. In the numerical solution of the problem special quadrature formulas for singular integrals of Cauchy type and the finite difference method are applied. The influence of defects on each other for double curved shell has been investigated. The given theoretical results can be used for the calculation of structural elements with holes, cracks on the strength and fracture toughness in various branches of engineering.     

Risk factors associated with online game addiction: A hierarchical model

Online gaming addiction has been increasingly recognized as a mental disorder. However, the predictive factors that lead to online gaming addiction are not well established. The aim of this study was to identify factors that may influence the development of online gaming addiction. A total of 263 patients with problematic online gaming addiction (255 males (97%) and 8 females (3%), age: mean = 20.4 ± 5.8 years) and153 healthy comparison subjects (118 males (77%) and 35 females (23%), age: 21.2 ± 5.5 years, range) were recruited for participation in the current study. Hierarchical logistic regression analyses among each set of variables were conducted. Individual factors (sex and age), cognitive factors (IQ and perseverative errors), psychopathological conditions (ADHD, depression, anxiety, and impulsivity), and social interaction factors (family environment, social anxiety, and self-esteem) were evaluated in a stepwise fashion. All four factors were associated with online gaming addiction, with psychopathological conditions being the strongest risk factors for the addiction. Individual factors, psychological factors, and social interactions were associated with the development of pure online gaming addiction. As before, psychological factors (attention, mood, anxiety and impulsivity) were the strongest risk factors for online gaming addiction in patients with pure online gaming addiction. Psychopathologies, including ADHD and depression, were the strongest factors associated with the development of online gaming addiction in individuals.     

Ranking of aircraft maintenance organization based on human factor performance

Aircraft maintenance organisation is a complex socio-technical setup, where human factors influence the quality of aircraft maintenance service. Maintenance service quality is assessed based on the commitment of management and its ability to provide suitable facility, tools, spares and manpower supported with comfortable environment and maintenance procedures. Assessment of the service quality of the aircraft maintenance organisation is a complex process. Airlines, regulators, insurance companies and other agencies need decision support system, to assess the performance of a maintenance organisation. This paper provides criteria and scientific approach for assessing the maintenance organisation; it presents a methodology of applying Analytical Hierarchy Process to prioritise the key functions and to rank the maintenance organisations under study. The study has established that maintenance service quality in airline is directly correlated to its fleet size.     

人纤维蛋白原对急诊外伤致创伤性凝血病疗效及相关因素分析

目的:探讨人纤维蛋白原(fibrinogen，FIB)对急诊创伤性凝血病患者的临床疗效及相关因素。方法:将2015年6月至2018年6月本院收治的100例严重创伤患者纳入本研究，根据是否创伤性凝血病分为凝血病组(80例)和非凝血病组(20例)。比较凝血病组和非凝血病组患者收住后第1个24 h的急性生理和慢性健康评分(acute physiology and chronic health evaluation II，APACHE II)、创伤严重程度评分(injury severity score，ISS)、低体温及低灌注发生率等指标。采用Logistic多因素回归方法分析严重创伤患者发生创伤性凝血病的相关因素。将80例创伤性凝血病患者随机分为观察组(40例)和对照组(40例)。对照组按照常规诊疗措施治疗，观察组在对照组处理基础上给予人FIB，比较治疗前后观察组和对照组的凝血功能指标，及治疗后的临床用血量、住院时间及病死率。结果:与治疗前相比，治疗后观察组和对照组的凝血酶原时间(prothrombin time，PT)、活化部分凝血活酶时间(activated partial thromboplastin time，APTT)及D-二聚体水平降低(P<0.05)，FIB水平明显升高(P<0.05)。观察组的红细胞(red blood cell，RBC) 输注量、新鲜冰冻血浆(fresh frozen plasma，FFP)输注量、重症加强护理病房(intensive care unit，ICU)时间及病死率均明显低于对照组，差异具有统计学意义(P<0.05)。创伤性凝血病患者PT>18 s(r=0.623，P=0.024)、APTT>60 s(r=0.722，P=0.018)、凝血酶时间(thrombin time，TT)>15 s(r=0.719，P=0.033)与ISS评分呈正相关。碱缺失(base deficit，BD)≥6(OR=3.678，95%CI=1.065～9.417)、格拉斯哥评分(Glasgow coma scale，GCS)≤8(OR=5.299，95%CI=1.122～8.711)和血小板(platelet，PLT)计数(OR=0.982，95%CI=0.971～0.996)是严重创伤患者发生创伤性凝血病的独立预测因素。结论:人FIB可有效改善创伤性凝血病患者的凝血功能，降低病死率、缩短ICU时间，创伤性凝血病与创伤严重程度、合并休克、低体温和重型颅脑损伤存在一定的相关性。     

接轨站设置位置和布置图型的影响因素及其分类

通过对接轨站设置位置和布置图型主要影响因素的分析。按照能够充分反映接轨站作业特点的交接方式。对接轨站所采用的布置图型进行了归纳和分类。     

沙漠地区高精度地震资料处理技术

受静校正及各种类型干扰的影响,西部沙漠地区地震资料的高精度处理较东部地区有更大的难度。对准噶尔盆地中部Ⅱ区、Ⅲ区、Ⅳ区、顺托果勒等区块地震资料在振幅恢复、静校正、去除各类噪音、高精度速度分析及叠前、叠后子波处理等方面进行了大量的试验与研究,形成了较为系统的高精度地震资料处理技术,在西部不同区块地震资料处理中取得了较好的应用效果。     

醇解技术在制备皮革加脂剂方面的研究进展

本文介绍了醇解反应的动力学、影响醇解反应收率的因素以及醇解反应在合成加脂剂方面的应用。     

带通采样在数据采集中的应用研究

在数据采集中采用带通采样，可大大降低采样率，但系统中的抗混叠滤波器会造成相位的非线性。采用对滤波后的信号进行带通采样，然后再用FRR滤波器校正相位的非线性，从而不失真地还原原信号，最后在Matlab中进行仿真，验证了该方法的有效性。     

石油沥青60℃动力粘度测定影响因素的探讨

粘度是表征沥青稠度的一个重要指标。通过论述石油沥青粘度测定法(真空毛细管法)中毛细管的选择、温度、真空度、取样量等对试验结果的影响及试验过程中的其它注意事项,表明了在测定石油沥青的60℃动力粘度时,必须严格按照试验方法的要求进行测定,以保证试验结果的准确性。