基于倾角传感器的MC法优化设计60Co辐射屏蔽装置

实验室自主研发“葫芦娃”机器人在完成自动换装过程中需要倾角传感器对机械臂转动角度进行实时反馈。针对电子元器件耐辐照能力较弱的情况,本文为倾角传感器设计辐射屏蔽装置,利用MCNP程序建立屏蔽装置模型,通过对5个面的辐射通量分析,通过优化各面铅的厚度,减小整个屏蔽体的重量,研究开散热孔对屏蔽体整体性能的影响以及辐射衰减与距离之间的关系,初步验证了本文设计的辐射屏蔽装置作为高辐射场下屏蔽γ射线的模型所具有的合理性。     

钛表面钠氢氧钛纳米线的结构、生物活性和MC3T3-E1细胞响应

采用化学方法处理微弧氧化(MAO)制备的含Si、Ca元素的Ti O2涂层(SC),获得钛氢氧钠(Na0.8H1.2Ti3O7)生物活性纳米线结构。化学处理过程中,SC涂料表面出现了Ca、Na元素溶解,Si元素沉积的现象。化学处理后的SC涂层比SC涂料具有更好的吸水性和诱导磷灰石形成能力。这与处理后涂层(SHTO)特殊的纳米结构有关,在模拟体液浸泡过程中更容易形成Ti-OH。同时,钠氢氧钛纳米线的表面形貌、相组成、OH基团以及良好的湿润能力使其更加适合于MC3T3-E1细胞的粘附和增值。     

Microphase Separation of a Diblock Copolymer Dispersed in Nanorod Arrays Grafted on a Plate: A Monte Carlo Study

The microstructure of a diblock copolymer dispersed in nanorod arrays grafted on a plate are investigated via annealing MC simulation. The confinement in nanorod arrays provides a complex confined space which leads to complicated microphase separation structures. Different morphologies of top and bottom of the film in the nanorod arrays are observed by varying the inducing height of nanorod and its grafting density in the bottom. Due to a short inducing range by the nanorods, the top structures are therefore mainly dominated by the competition between the absolute height of off‐induced layer on the top and the nature of block copolymer itself; while the bottom structures are affected by the symmetry of block copolymer and the gap among rods.

     

Direct determination of δ44/42Ca isotope ratio by ion chromatography/low‐resolution multicollector ICPMS

High‐precision on‐line procedure for measurement of calcium isotopic ratio by coupling ion chromatography to multicollector inductively coupled plasma mass spectrometry was developed. Calcium separation from the sample matrix was achieved on an ion chromatography column—IonPac CS16—ID 3 mm connected with CERS 500 2 mm suppressor and followed by multicollector inductively coupled plasma mass spectrometry calcium isotopic ratio determination. Dry plasma mode was used with Aridus II desolvation system. To sustained samples with high level of total dissolved salts as well as account capacity of applied analytical column, the method has been optimized regarding calcium isotope ratio measurements with low‐resolution mass spectrometry. Mass discrimination and instrument drift were corrected by sample‐standard bracketing method using the ⁴⁴Ca/⁴²Ca isotope ratio of SRM 915a as a standard. Good accuracy and reasonable precision of calcium isotope ratio (generally 0.20‰ [2SD]) were achieved, which are comparable to off‐line Ca separation and continuous measurement. The reproducibility of the proposed analytical procedure was verified by measuring the SRM 915a standard as a sample randomly over 3 months (n = 56). Applicability of the protocol was demonstrated for matrix‐rich natural water samples, coral samples, and bone standard reference materials.     

一种智能家用小型榨油机控制系统的设计

随着人们对食品安全的重视,自榨食用油正悄然成为一种新的健康生活方式。智能家用小型榨油机是在传统工厂大型榨油机技术的基础上,设计的一种全自动的厨房家电产品。本文着重从系统的硬、软件设计方面进行探讨,使该控制系统能够自动对不同榨油料加热翻炒、压榨,高效快速地制作出新鲜安全的各种食用油及其酱料。     

基于GMS的汽车事故求救系统设计

为了在汽车意外事故后伤者能得到及时的救援, 设计了一种基于嵌入式的汽车事故求救系统。该系统以MC9S12XS128为主控芯片, 利用三轴加速传感器MPU6050和GPS(Global Positioning System)判断车辆的姿态信息和位置信息, 并通过GSM(Global System for Mobile Communications)模块将车况数据传给呼叫中心和家
属端, 接收端对事故确认后迅速救援。测试结果证明了该系统的可靠性。     

面向大规模定制的再制造集约生产计划模型

针对大规模定制(MC)的废旧产品回收再制造的生产方式,考虑再制造系统的复杂性以及各种不确定因素,构造了闭环供应链下面向MC的再制造集约生产计划(RAPP)模型.根据模糊集理论,采用模糊线性规划的方法,将不确定模型转化为清晰的确定型大规模整数线性规划(MILP)模型,试图找出最大利润下,企业在各计划期内的最优零部件外购批量、自制零部件批量以及生产批量.通过一算例来验证该模型的有效性,并分析了相关因子变动对总利润的影响,便于企业经营管理决策者在最优利润下选择相应的RAPP.     

钙伯三醇的关键中间体——麦角甾烷-5，7（E），10（19）-三烯-6（S）-二氧化硫的合成

麦角甾烷-5,7(E),10(19),22(E)-四烯-6(S)-二氧化硫(1)经臭氧化反应合成了钙伯三醇(MC903)的重要中间体--麦角甾烷-5,7(E),10(19)-三烯-6(S)-二氧化硫(2),其结构经1H NMR和13C NMR表征.较佳的臭氧化反应条件为:1 1.0 mmol,溶剂为V(二氯甲烷):V(甲醇)=4:1,于-65℃～-78℃反应12 min.在此条件下,2中醛基α-位的差相异构化降至最低程度,产率90%.对差相异构化的机理进行了讨论.     

铸型尼龙/纳米ZnO复合材料的制备与表征

采用原位聚合反应制备MC尼龙6/纳米ZnO复合材料并对其性能、形貌和结晶形态进行了分析.分析结果表明:MC尼龙6/纳米ZnO复合材料中ZnO达到了纳米级分散,并且粒子分布比较均匀,粒子的粒径在30~50 nm左右.纳米ZnO没有改变尼龙6的结晶形态.纳米ZnO的加入起到同时增强增韧的作用;使体积电阻系数降了8×104倍、表面电阻系数降了5.7×104倍、摩擦系数降低了29%,MC尼龙6/纳米ZnO复合材料摩擦磨损性能和抗静电性能明显优于MC尼龙6;经过力学拉伸试验的破坏,引起MC尼龙6结构发生宏观应力变化,造成(002 202晶面)产生明显的择优取向.     

A highly specific immunoassay for microcystin-LR detection based on a monoclonal antibody

Microcystins (MC) are cyanobacterial hepatotoxins responsible for animal-poisoning and human health incidents. Immunoassays provide a sensitive and fast means to detect these toxins, but cross-reactivity (CR) characteristic of different antibodies was variable. Here, we have produced and characterized a monoclonal antibody (Clone MC8C10) with highly specificity against the most frequent and most toxic variant of microcystins, MC-LR. MC8C10 is more specific against MC-LR among the reported antibodies before. The immunogen was synthesized from the modified MC-LR and bovine serum albumin (BSA). An indirect competitive enzyme-linked immunosorbent assay (ic-ELISA) with MC8C10 was established to detect the MCs in waters, which showed highly specificity with MC-LR, and have a detection limit for MC-LR 0.1 μg L⁻¹, the 50% inhibition concentration (IC₅₀) for MC-LR was 1.8 ± 0.1 μg L⁻¹ and the quantitative detection range was from 0.3 to 10 μg L⁻¹. The [4-arginine] microcystins and the nodularin-R showed lower cross-reactivates (CR < 10%), and other MCs such as MC-LF and MC-LW are not recognized (CR < 10⁻⁴). The analysis results of real water samples with ic-ELISA showed that all the coefficients of variation were less than 15%, and the recovery was (100.3 ± 5.9)%. So the highly specific ic-ELISA will commendably suit for sensitive analysis for MC-LR in surface water as well as drinking water.