某大机动无人机基于飞行任务的敏捷性评估飞行科目设计与仿真

由于现代空战的特点，根据时间量级分类的单维度的敏捷性评估已经不能满足空战的需求。为了优化控制系统的设计，最大限度地发挥飞机的飞行性能，需要对大机动无人机进行基于飞行任务的敏捷性评估。针对大机动无人机敏捷性评估的特点，从20个标准评估机动任务集中选取了3种与某无人机实际使用相关性较强的飞行任务作为其评估机动，展开了无人机基于飞行任务的敏捷性评估和仿真验证。对选取的3种飞行任务进行了详细的敏捷性评估方法描述，在通用的无人机敏捷性评估仿真环境中对加入非线性飞行控制律的某大机动无人机进行了基于3种飞行任务的敏捷性评估仿真验证，根据评估结果对控制律进行调参，为控制律设计提供指南和优化依据。     

矿井内因火灾的安全评价研究--基于熵值法和突变理论

针对矿井内因火灾的突发性、不确定性和高危害性等特点,提出熵值法和突变理论相结合的矿井内因火灾安全评价方法。选取人、物、环境和管理4个方面的因素建立了4级共20个评价指标的矿井内因火灾安全评价指标体系,运用熵值法判断各个指标的权重,利用突变级数法计算突变级数值,避免了单一熵值法主观人为赋权的弊端。以陕西省红石岩煤矿为例,运用该评价方法对其进行了内因火灾安全评价,其评价结果符合该矿井的安全状况,验证了该评价方法的可行性、实用性。     

抗凝冰乳化沥青涂层的性能研究

为了研究自制融雪剂对抗凝冰乳化沥青涂层性能的影响,将自制固态型融雪剂按5%、10%、15%的比例加入乳化沥青制备涂层乳液,采用水煮法、摆式摩擦仪、电导率试验分别对涂层材料的粘附性、抗滑性能和抗凝冰性能进行了测试。结果表明:自制型融雪剂对乳化沥青与集料的粘附性影响不大;随着融雪剂掺配比例的增大,抗凝冰乳化沥青涂层的摩擦系数有所降低,但均满足规范要求;相比于普通沥青涂层,抗凝冰乳化沥青涂层的抗凝冰性能得到改善,且随着融雪剂掺配比例的增大,凝冰性能逐渐提高。     

苏里格致密砂岩气藏未动用储量评价及开发对策

为落实苏里格气田强非均质致密砂岩气藏储量规模和动用程度、评价稳产潜力，基于储层地质知识库，通过细分计算单元采用"容积法"完成储量复算；结合储层静态参数、气井生产指标及内部收益率建立了储量分类评价标准，将储量分为富集区、致密区和富水区三类；优选"单井控制面积法"评价已动用储量和剩余未动用储量。评价结果表明，苏里格气田储量基础落实，各区块储量动用程度差异大，储量综合动用程度为40.1%，剩余未动用储量规模大，稳产潜力较好。目前经济技术条件下，气田稳产主要通过井网加密、侧钻水平井及查层补孔的方式来提高富集区和致密区储量动用程度，富水区剩余储量的有效动用仍须进一步攻关。     

旗袍三围规格的优化设计研究

旗袍需要拥有合身的廓形,贴体程度要求高且强调人体曲线美感,而旗袍的松量设计直接影响其外观造型的优美程度及穿着舒适感。文章首先采用正交实验法针对相同款式旗袍设计了9种不同水平组合的三围松量设置方案,并制作成相同款式不同三围规格的旗袍样衣;然后利用心理学标尺,对9件旗袍样衣的静态造型和穿着舒适感分别进行主观评价,并利用直观分析法和方差分析法综合分析主观评价结果;最后对分析结果进行验证,最终找出外观造型优美程度高和穿着舒适感佳的三围松量水平组合,为旗袍三围规格的优化设计提供理论依据。     

于都黄麟-祁禄山地区土地质量地球化学评价

通过对于都县黄麟-祁禄山地区开展1:5万土地质量地球化学调查,在野外土壤样品采集和化验测试的基础上,系统地研究了影响土地质量的各项地球化学指标特征与控制因素,基本查明有益元素、重金属元素分布,划分出重点污染区和绿色土地发展区,并进行土地质量等级评价,为永久基本农田建设、土地资源开发与利用等方面提出建议。     

Eddy Current Detection of Retained Austenite in Ni-Hard4 Cast Iron

In this article, the nondestructive eddy current (EC) method was used for microstructural evaluation of Ni-hard4 cast iron (NiHCI). Different destabilizing heat treatments were used to produce different microstructures and hardness. The microstructural analysis and hardness measurement were done for conventional characterization of the reference blocks. Then, the EC techniques were applied to evaluate the hardness and microstructural changes by the detection of EC parameters at different frequencies. Metallurgical investigations showed that increasing the destabilizing soaking time and temperature decreases the amount of retained austenite in NiHCIs. The nondestructive evaluation method (NDT) revealed that it can be good correlated between retained austenite amount and hardness with EC parameters. This shows that the EC technique can detect NiHCIs products according to the metallurgical characterization with good accuracy.     

红外热成像在乳腺疾病检测的应用研究

乳腺疾病已严重危害女性身心健康,其中乳腺癌更位居全球范围内女性癌症发病率和死亡率首位,因此乳腺癌的早期发现意义重大。传统结构影像学早期检测疾病具有一定局限性,而红外热成像作为功能成像技术可为乳腺癌的早期筛查提供有效线索。因此本文主要就红外热成像在乳腺疾病的早期检测及预后评估的应用价值进行综述。     

A novel methodology for forecasting gas supply reliability of natural gas pipeline systems

In this paper, a novel systematic and integrated methodology to assess gas supply reliability is proposed based on the Monte Carlo method, statistical analysis, mathematical-probabilistic analysis, and hydraulic simulation. The method proposed has two stages. In the first stage, typical scenarios are determined. In the second stage, hydraulic simulation is conducted to calculate the flow rate in each typical scenario. The result of the gas pipeline system calculated is the average gas supply reliability in each typical scenario. To verify the feasibility, the method proposed is applied for a real natural gas pipelines network system. The comparison of the results calculated and the actual gas supply reliability based on the filed data in the evaluation period suggests the assessment results of the method proposed agree well with the filed data. Besides, the effect of different components on gas supply reliability is investigated, and the most critical component is identified. For example, the 48th unit is the most critical component for the SH terminal station, while the 119th typical scenario results in the most severe consequence which causes the loss of 175.61×10⁴ m³ gas when the 119th scenario happens. This paper provides a set of scientific and reasonable gas supply reliability indexes which can evaluate the gas supply reliability from two dimensions of quantity and time.