高效液相色谱-串联质谱法测定化妆品中13种紫外线吸收剂

建立了高效液相色谱-串联质谱法测定化妆品中13种紫外线吸收剂的方法。利用四氢呋喃与甲醇/水体系提取化妆品中的目标成分,用反相高效液相色谱分离,在多反应监测(MRM)模式下以保留时间和离子对(母离子和2个碎片离子)信息比较进行定性和定量分析。结果表明,13种紫外线吸收剂在10~500μg·L-1内线性关系良好,定量限(LOQ)为10~30 mg·kg-1,方法回收率为85.2%~115.1%,相对标准偏差(n=6)为1.1%~8.1%。此方法可用于化妆品中13种紫外线吸收剂的确证与定量测定。     

6-碘-1-四氢萘酮的合成

6-碘-1-四氢萘酮是合成5-HT6受体拮抗剂的重要中间体。以四氢萘为原料,经乙酰化、羰基的肟化、贝克曼重排、三氧化铬氧化和桑德迈尔反应等5步反应制备了6-碘-1-四氢萘酮,反应总收率60％。     

风力发电系统中储能装置的经济评估

介绍了蓄电池的等效模型,提出一种储能装置经济效益的新型判据,根据并网电价、蓄电池成本、使用年限等因素,分析储能装置中蓄电池所产生的经济效益。     

液氯储罐的选材及安全防护

根据液氯的物化性质,通过分析液氯储罐出现泄漏后液氯气化过程中压力、温度的变化对储罐造成的影响,提出了液氯储罐材质的选用要求,并从安全的角度提出液氯储罐日常使用中的安全防护措施及对使用中的液氯储罐的安全管理,保证了液氯储罐的安全稳定运行,减少事故发生。     

一种新型还原性球形纤维素吸附剂的制备及表征

以改性球形纤维素吸附剂为载体,通过液相还原法,成功制取还原性球形纤维素吸附剂MSCB-Fe。Fe2+首先负载在改性纤维素吸附剂表面,接着被NaBH4溶液还原成零价铁。利用傅里叶变换红外光谱(FT-IR)、环境扫描电子显微镜(ESEM)、X射线衍射(XRD)和X射线能谱(EDAX)对MSCB-Fe进行表征,结果表明,液相还原法可成功在MSCB表面制取零价铁。并用MSCB-Fe进行氯仿的降解实验,氯仿的去除率高达84.4%。     

碳纳米管掺杂对铅酸电池负极板性能的影响

利用工业工艺,将碳纳米管、石墨和锌化物分别掺入铅酸电池负极材料中制备出3种铅负极板,并分别组装成电池。研究发现,在0.2C、0.5C倍率下掺杂碳纳米管的负极板的铅酸电池具有较高的电池容量。还利用红外、X射线衍射、电子扫描电镜等技术对得到的负极板进行了表征。结果表明,虽然在红外和X射线衍射谱图中未见明显的区别,扫描电镜照片说明掺杂有碳纳米管的负极板的颗粒均匀性较高。     

激光沉积成形用超声振动系统的研制

为了细化晶粒、均匀组织成分,将超声振动引入激光沉积成形系统中.针对沉积系统的结构特点,设计了超声振动系统,对其中的超声电源和换能器进行了选择,并对超声变幅杆进行了设计和计算;然后测试了系统性能,并采用工艺试验验证其效果;从试验试件的宏观形貌、内部组织两方面,分析了超声振动对沉积层组织的影响.结果表明施加超声作用后沉积层单道沉积高度变小,原本较长的枝晶被振动的各种效应打碎,晶粒得到细化.     

Topology recovery technique for complex freeform surface model after local geometry repair

Intersections and discontinuities commonly arise in surface modeling and cause problems in downstream operations.Local geometry repair,such as cover holes or replace bad surfaces by adding new surface patches for dealing with inconsistencies among the confluent region,where multiple surfaces meet,is a common technique used in CAD model repair and reverse engineering.However,local geometry repair destroys the topology of original CAD model and increases the number of surface patches needed for freeform surface shape modeling.Consequently,a topology recovery technique dealing with complex freeform surface model after local geometry repair is proposed.Firstly,construct the curve network which determine the geometry and topology properties of recovery freeform surface model;secondly,apply freeform surface fitting method to create B-spline surface patches to recover the topology of trimmed ones.Corresponding to the two levels of enforcing boundary conditions on a B-spline surface,two solution schemes are presented respectively.In the first solution scheme,non-constrained B-spline surface fitting method is utilized to piecewise recover trimmed confluent surface patches and then employs global beautification technique to smoothly stitch the recovery surface patches.In the other solution scheme,constrained B-spline surface fitting technique based on discretization of boundary conditions is directly applied to recover topology of surface model after local geometry repair while achieving G 1 continuity simultaneously.The presented two different schemes are applied to the consistent surface model,which consists of five trimmed confluent surface patches and a local consistent surface patch,and a machine cover model,respectively.The application results show that our topology recovery technique meets shape-preserving and G 1 continuity requirements in reverse engineering.This research converts the problem of topology recovery for consistent surface model to the problem of constructing G 1 patches from a given curve network,and provides a new idea to model repairing study.     

基于CAN总线的液压同步滑移控制系统设计与实现

液压同步滑移是为解决施工中大跨度、大空间结构安装问题而发展起来的一项技术,其应用已经越来越广泛.为了达到控制精度高、响应速度快和布线简单的控制要求,系统采用了基于CAN总线的液压同步控制技术.阐述了基于CAN总线的液压同步滑移控制系统的组成及各节点硬件和软件设计.