不同前处理方法对植物油中苯并(a)芘含量测定的影响

通过对比硅胶柱层析法、正己烷-乙醚混合液洗脱氧化铝柱层析法、石油醚洗脱氧化铝柱层析法、溶剂萃取法对植物油中苯并(a)芘含量测定的影响,从而选择最佳的前处理方法。结果表明:当苯并(a)芘质量浓度为7.575 0 ng/m L以下时,硅胶柱层析法的回收率达到100%;正己烷-乙醚混合液洗脱氧化铝柱层析法的回收率达到90%以上,其RSD都在1.0%以下。说明这两种前处理方法的回收率高且稳定,皆能准确地测出植物油中的苯并(a)芘含量;而石油醚洗脱氧化铝柱层析法和溶剂萃取法的回收率分别为54.9%~66.4%和37.3%~44.7%,RSD分别为0.19%~0.77%和1.35%~3.48%,表明这两种方法对植物油中苯并(a)芘含量测定具有较大的误差。     

以水务云端三维GIS与移动技术构建智能防灾预警与救灾决策支持系统

近年来台湾受到台风灾害的频率、规模、影响所造成的损失有逐年增加趋势。灾害种类与内容更是多样化与复合化,已非单一对策或措施可以防治或应变抢救。因此为事前减少或防止灾害对于人民生命财产的损害,除要了解各种灾害的成因、过程外,更需根据先进科学研究与历史资料探索,探明灾害在空间上的分布范围与集中程度。建立知识平台、数据探勘及综合管理机制,积极构建防灾预警与救灾决策支持系统,可在减灾体系和预警系统的建立上发挥极大作用,可使该系统在今后经历灾害后得到补充和完善。     

一种超宽线性范围低通带衰减的OTA-C心电信号滤波器设计

介绍了一种基于全差分运算跨导放大器（OTA）的超宽线性范围低通带衰减的五阶Butterworth低通滤波器。该滤波器主要应用于可穿戴式无线体域网的UWB健康监护与遥测系统。为了提高OTA-C滤波器线性范围,对典型小跨导电路的源极负反馈结构进行了改进,并将共源共栅结构作为OTA的输出级以减少滤波器的通带衰减。为了适应生物医学芯片的低功耗特性,基于OTA结构的电路工作在亚阈值区。电路基于SMIC 0.18-μm CMOS工艺进行设计并流片。测试结果表明,滤波器的通带衰减仅为6.2dB,-3-dB频率为276 Hz;对于输入100 Hz、0.8 VPP的正弦信号,该滤波器的总谐波失真（THD）为56.8 dB。利用该滤波器对含有噪声干扰的ECG信号进行滤波, 结果证明了该滤波器能有效地滤除噪声干扰。     

拉索体系相关标准及规范的研究

通过对国内和国际通用的拉索体系标准及规范进行研究,从对拉索索体母材的疲劳性能、预应力筋——拉索锚具组件的疲劳性能和水密性能所提出的试验条件等方面进行比较,研究各标准及规范的共性与差异性。从各标准及规范对拉索体系各项性能要求的比较,及国际斜拉索规范对拉索防腐体系要求的解读,找出我国在斜拉索标准与国际规范的差距。结合拉索体系的设计、制造、检验、安装及维护对各规范中相关条款的合理性及可操作性进行分析,对这些标准的执行或修订提出一些思考。     

一种基于模块化药盒的智能服药管家系统设计

针对养老院患者经常忘服、多服、错服药和养老院看护人配药效率低的问题,设计了一套多个模块化药盒拼接而成的智能服药管家系统.药盒以ESP32为主控芯片,利用多重身份识别技术来确认服药人的身份,设计优化配药策略,最终实现了迅速配药、用药提醒、用药监护的功能.为此大大提高了养老院为患者配药的效率,并能有效地监控患者服药,实现了从配药、服药再到用药监控的智能化管理,具有一定的市场应用价值.     

The formation of the S‐shaped edge‐on lamellae on the thin porous polylactic acid membrane via phase separation induced by water microdroplets

Biodegradable polymers have received increased attention due to their potential application in the medicine and food industries; in particular, poly(lactic acid) (PLA) is a primary biopolymer because of its excellent biocompatibility and absorbability features. In this study, a porous PLA membrane was fabricated by phase separation using water microdroplets produced by an ultrasonic atomizer as a coagulation bath. The formation of S‐type clusters was attributed to the slow exchange rate between solvent and coagulant, which provided time for the movement of polymer molecules. The effect of preparation conditions on the structure of S‐type clusters, including polymer concentration in solution and ambient temperature was investigated. The PLA porous membrane prepared from water micro‐droplets with different morphology compared with the sample fabricated from distilled water has potential application in fields of tissue engineering and artificial organ generation. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43355.     

Poly[6‐(2,6‐bis(1′‐methylbenzimidazolyl)pyridin‐4‐yloxy)hexyl acrylate] (PBIP) and its terbium (III) complex (PBIP‐Tb3+): Homopolymerization,optical, and magnetic performance

Poly[6‐(2,6‐bis(1′‐methylbenzimidazolyl)pyridin‐4‐yloxy)hexyl acrylate] (PBIP) and its terbium complex (PBIP‐Tb³⁺) were prepared and characterized by ¹H NMR and FT‐IR. The optical properties of PBIP‐Tb³⁺ complex were characterized by UV–vis spectroscopy and fluorescence spectroscopy. Both polymer PBIP and PBIP‐Tb³⁺ complex show good thermal stability. The magnetic property of PBIP‐Tb³⁺ complex was measured as a function of temperature (5–300 K) at 30 kOe and as a function of an external field (?50 to 50 kOe) at 5 K. Magnetic hysteresis loop of PBIP‐Tb³⁺ complex at 5 K shows typical “S” shape and PBIP‐Tb³⁺ complex is soft ferromagnetic. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 44249.     

Synergistic effects of α/β‐nucleating agents on propylene‐ethylene random copolymer: New clues for the pipe extrusion

Adding β‐nucleating agents (β‐NAs) has been generally considered as an effective approach to induce the formation of β‐crystals in propylene‐ethylene random copolymer (PPR). However, it is still difficult to obtain the expected percentage of β‐crystal under normal processing conditions, due to the temperature control is always a key factor no matter with or without adding β‐NAs. We assumed that simultaneously adding both α‐ and β‐NAs to PPR in rational ratios would facilitate the growth of β‐crystal. The effects of adding various amount of α‐ and/or β‐NAs on the α‐ and β‐crystallization behavior and morphology were investigated. More importantly, the influence of temperature control on inducing β‐crystal in the presence of different NAs was parallel explored by utilizing sample bars prepared via injection molding and sample pipes produced from a typical industrial extrusion line. Different crystallization situations were carefully discussed in response to various nonisothermal crystallization processes in laboratory experiments and in actual pipes extrusion. At last, the mechanical properties of PPR samples were examined to provide new clues for further study of PPR pipes. POLYM. ENG. SCI., 56:1089–1095, 2016. © 2016 Society of Plastics Engineers     

β型Ti-Mo-O合金的高温氧化及相析出行为

利用OM、XRD、EPMA、维氏硬度计并结合第一性原理计算调查了Ti-15Mo-xO(x=0.1,0.2,0.3,0.4,0.5,质量分数,%)合金在873 K和1073 K下的氧化行为,以及837 K下的α相析出行为。结果表明,在873 K,氧化产物均由TiO2、Ti3O和Ti6O组成,且O含量对合金的氧化行为无明显影响,均主要由Ti向基体外扩散控制。在1073 K,尽管各合金的氧化产物均为TiO2,但O含量对合金的氧化行为具有明显影响：低O合金中,氧化过程由O与基体金属的氧化反应和O向基体内扩散共同控制;而随O含量增加,其转变为O向基体内扩散,抗氧化性能显著提高。在873 K下时效10 h和100 h后,析出的α相随O含量和时效时间的增加而增多,富Mo贫O的β相晶格常数减小,富O贫Mo的α相c值增大,a值基本不变,c/a值增大。时效前后合金硬度随O含量增加而增大,然而,在相同O含量条件下,随着α相的析出,合金元素Mo和O在两相中重新分配,导致时效后合金的硬度降低。     

受断层影响的地表移动计算

分析了存在断层岩体的移动规律的变化，提出了断层影响先产生断层面离层，再进一步扩展的移动过程。并以此为依据建立了受断层影响的地表移动计算模式。断层影响的基本规律是在断层带形成一离层空间，断层影响下的地表移动是开采空间影响与开采在断层带上产生离层空间影响的叠加。影响断层出现台阶的大小与断层相对位置、断层倾角等诸因素相关。