圆锥体与圆柱体的几何绕射理论绕射线寻迹

基于几何绕射理论研究了圆锥体以及圆柱体上精确的绕射寻迹方程，所得公式在射线寻迹上适用于远场与近场，比目前文献提及的方法更精确，数值计算结果在远场情况下与文献结果吻合，该方法应用于工程计算中能得到较为满意的结果。     

四坐标牙轮测量系统的误差分析

开发了一套对牙轮位置、角度等尺寸进行砟骅检测的四坐标系统，介绍了整个系统的测量方法。根据四坐标牙轮测量系统的特点和测量数据推导了牙轮被测参数的计算公式；仔细分析了测量系统的各误差源，并通过实验获得了相应的误差数据；建立了仪器的误差数学模型；提出了修正误差的方法。     

太阳系行星公转轨道的锥面支架设计研究

依据太阳系行星公转轨道参数将平面曲线扩充成空间曲面,建立异面椭圆变换关系和椭圆锥面方程,分析锥面截线的展开特征,给出锥截面构件的平面加工方法和同顶共焦锥面支架的合成方法。     

渤海底水油田泡沫控水锥技术研究与应用

底水锥进是目前渤海底水油田开发所面临的严峻问题。针对本问题,通过泡沫扫描方法,多孔介质内阻力因子测试、封堵能力评价、提高采收率评价等手段对泡沫生成、稳定性、封堵效果、抗油性等进行了研究。结果表明,泡沫有较好的控水效果,并且确定施工起泡剂质量分数为0．5％,气液体积比为2∶1。该技术在渤海Q HD32-6油田进行了成功应用,实现了良好的控制水锥效果,表明该技术具有良好的应用前景。     

用双桥静力触探计算粘性土承载力的经验公式

通过双桥静力触探资料与钻探资料的对比,提出了侧壁阻力与一般粘性土的塑性指数及液性指数的关系,在此基础上,统计出利用双桥静力触探资料确定一般粘性土承载力的经验公式.     

Chemical Composition and Antioxidant Activities of Three Polysaccharide Fractions from Pine Cones

The traditional method of gas chromatography-mass spectrometry for monosaccharide component analysis with pretreatment of acetylation is described with slight modifications and verified in detail in this paper. It was then successfully applied to the quantitative analysis of component monosaccharides in polysaccharides extracted from the pine cones. The results demonstrated that the three pine cone polysaccharides all consisted of ribose, rhamnose, arabinose, xylose, mannose, glucose and galactose in different molar ratios. According to the recovery experiment, the described method was proved accurate and practical for the analysis of pine cone polysaccharides, meeting the need in the field of chemical analysis of Pinus plants. Furthermore; the chemical characteristics, such as neutral sugar, uronic acids, amino acids, molecular weights, and antioxidant activities of the polysaccharides were investigated by chemical and instrumental methods. The results showed that the chemical compositions of the polysaccharides differed from each other, especially in the content of neutral sugar and uronic acid. In the antioxidant assays, the polysaccharide fractions exhibited effective scavenging activities on ABTS radical and hydroxyl radical, with their antioxidant capabilities decreasing in the order of PKP > PAP > PSP. Therefore, although the polysaccharide fractions had little effect on superoxide radical scavenging, they still have potential to be developed as natural antioxidant agents in functional foods or medicine.     

几种阻燃剂对格栅用HDPE的阻燃及协效作用研究

利用氧指数,锥形量热仪试验和酒精喷灯燃烧试验研究几种阻燃剂在格栅用的高密度聚乙烯（HDPE）中的阻燃及协效作用。结果表明：单种阻燃剂在相同添加量下,氯化石蜡（CP）阻燃HDPE的极限氧指数最高,并能通过酒精喷灯燃烧试验。两种阻燃剂配合使用时,可膨胀石墨（EG）／CP、EO／氢氧化铝（ATH）、ATH／红磷（RP）具有较好的协效作用;CP／RP和ATH／硼酸锌共用具有对抗作用;溴系阻燃剂与RP、EG、ATH共用时协效作用不明显。阻燃HDPE只有在极限氧指数大于25,燃烧中滴落速度较快时,才能通过酒精喷灯燃烧试验。     

Contact-induced Damage in Ceramic Coatings on Compliant Substrates: Fracture Mechanics and Design

Simple explicit relations are presented for the onset of competing fracture modes in ceramic coatings on compliant substrates from Hertzian-like contacts. Special attention is given to a deleterious mode of radial cracking that initiates at the lower coating surface beneath the contact, in addition to traditional cone cracking and quasiplasticity in the near-contact area. The critical load relations are expressed in terms of well-documented material parameters (elastic modulus, toughness, hardness, and strength) and geometrical parameters (coating thickness and sphere radius). Data from selected glass, Al₂O₃ and ZrO₂ coating materials on polycarbonate substrates are used to demonstrate the validity of the relations. The formulation provides a basis for designing ceramic coatings with optimum damage resistance.     

Intrinsic flame resistance of polyurethane flexible foams: Unexpectedly low flammability without any flame retardant

Virgin polyurethane flexible foams are widely assumed to be highly flammable materials. The flammability of three model polyurethane flexible foams suggests that this may not be universally true. Two of them show unexpectedly low flammability in the limiting oxygen index test and pass flammability tests such as FMVSS 302 and FAR 25.853. Cone calorimetric measurements at 25 kW/m² and 50 kW/m² furthermore show a high resistance against ignition and demonstrate the self‐extinguishing properties of these two virgin, flame‐retardant‐free, polyurethane flexible foams.     

一种单面涂铝PVC塑料吊顶材料燃烧性能的实验研究

采用锥形量热仪对市场上常见的一种内装修单面涂铝PVC吊顶材料的燃烧性能进行了实验研究。实验结果表明，在不同的辐射功率和不同暴露面下，该材料表现出不同的燃烧性能。当涂铝面(正面)暴露燃烧时，其质量损失速率(即燃烧速率)比未涂铝面(背面)小，正面的引燃时间比背面引燃时间长，这些特性对减小燃烧时的火焰蔓延速度有利；而正面暴露燃烧时的发烟量和一氧化碳的产率则比背面暴露燃烧时大，这一特性将增大材料燃烧时的烟气危害性。