SCL教学模式在《机床电气控制》课程中的应用

“以学生为中心（Student—Centered Learning,SCL）”教学模式是西方国家主流教育理念,其在我国高职教育中应用较少。作者结合高职教育实情及特点和《机床电气控制》课程职业能力要求,革新课程教学模式将SCL教学模式应用到《机床电气控制》课程教学中去。实践证明SCL教学模式的应用有助于提高学生参与学习活动的积极性和热情,教学效果良好。     

北五味子木脂素对酒精性肝损伤小鼠免疫功能的影响

目的观察五味子木脂素对小鼠淋巴细胞亚群和自然杀伤细胞(NK细胞)的影响.方法应用五味子木脂素高、中、低3个剂量治疗酒精性肝损伤小鼠,联苯双酯对照,观察其对小鼠脏器系数、体液免疫功能、淋巴细胞增殖以及NK细胞活性的影响,利用流式细胞仪和MTT法检测其对淋巴细胞亚群、NK细胞的影响.结果五味子木脂素中剂量组胸腺、脾脏系数明显增加,与对照组比较差异具有统计学意义(P0.05);五味子木脂素中剂量组能显著降低CD8+水平,提高CD3+,CD4+水平及CD4+/CD8+比值,与对照组比较差异具有统计学意义(P0.05);五味子木脂素中剂量能提高NK细胞活性和T,B淋巴细胞增殖能力,与对照组比较差异具有统计学意义(P0.05).结论五味子木脂素能够增强酒精性肝脏损伤小鼠的免疫功能.     

SCL90测评分析系统

提出了利用计算机进行SCL90测评分析系统的设计思想,着重讨论了系统结构、数据库设计及实现的关键技术,并对系统进行了实现。该系统的进一步研究对SCL90的应用推广有广泛的意义     

Current Density‐Voltage and Capacitance‐Voltage Characteristics of Local p‐n Junction Structures in CuInSe2 Single Crystals

Local p‐n junction were obtained under room temperature conditions in CuInSe2 by applying strong electric field through small indium and copper contacts. The current density voltage (J‐V) and the capacitance‐voltage (C‐V) of three different samples were measured at room temperature. The J‐V method shows that the current is dominated by the drift component of the injected carriers. The C‐V method gave a barrier height of 1.04 eV for all three samples which agrees with the reported energy gap of this material. Analysis of these results indicate that the p‐n junction structures formed by strong electric fields are hihgly compensated and the current transport is dominated by the space charge limited current effect.     

极化码自适应连续消除列表比特翻转译码算法

极化码是一种新型的信道编码方法,并且具有较低的译码复杂度,第三代合作伙伴计划(3rd generation partnership project,3GPP)组织已经确定将极化码作为5G通信中增强移动宽带场景下的信道编码方案,目前极化码译码已经成为编码领域备受瞩目的研究热点.极化码连续消除列表比特翻转(successi...     

Synthesis and characterisation of new shell cross-linked micelles with amine-functional coronas

Shell cross-linked (SCL) micelles with amine-functional coronas have been constructed in aqueous solution by exploiting the micellar self-assembly of new thermo-responsive ABC triblock copolymers. These copolymers were prepared via atom transfer radical polymerisation (ATRP) in convenient one-pot syntheses and comprised a thermo-responsive core-forming poly(propylene oxide) [PPO] block, a cross-linkable central poly(glycerol monomethacrylate) [GMA] block and an amine-functional outer block based on either poly(2-(dimethylamino)ethyl methacrylate) [DMA] or poly([2-(methacryloyloxy)ethyl]trimethyl ammonium chloride) [QDMA]. DMF GPC analysis indicated an M_n of 17,700 and an M_w/M_n of 1.46 for the PPO-PGMA-PDMA triblock copolymer. The DMA residues of the PPO-PGMA-PDMA triblock copolymer were reacted with methyl iodide to prepare copolymers with differing degrees of quaternisation. Each triblock copolymer dissolved molecularly in aqueous solution at 5 °C and formed micelles with amine-functional coronas above a critical micelle temperature (CMT) of around 12 °C, which corresponded closely to the cloud point of the PPO macro-initiator. Cross-linking of the GMA residues in the inner shell using divinyl sulfone produced SCL micelles that remained intact at 5 °C, i.e. below the cloud point of the core-forming PPO block. Aqueous electrophoresis studies confirmed that these SCL micelles had considerable cationic surface charge, as expected. The cationic SCL micelles were adsorbed onto a near-monodisperse anionic silica sol, which was used as a model colloidal substrate. Thermogravimetric analyses indicated SCL micelle mass loadings of 6.1-15.5 wt.%, depending on the initial micelle concentration. Aqueous electrophoresis studies confirmed that surface charge reversal occurred on adsorption of the SCL micelles and scanning electron microscopy studies revealed the presence of SCL micelles on the silica particles.     

Spatial distribution of sonoluminescence and sonochemiluminescence generated by cavitation bubbles in 1.2 MHz focused ultrasound field

An intensified charge coupled device (ICCD) camera was used to observe the spatial distribution of sonoluminescence (SL) and sonochemiluminescence (SCL) generated by cavitation bubbles in a 1.2 MHz focused ultrasound (FU) field in order to investigate the mechanisms of acoustic cavitation under different sonication conditions for FU therapeutic applications.It was found that SL emissions were located in the post-focal region. When the intensity of SL and SCL increased as the power rose, the growth of SCL was much higher than that of SL. In the post-focal region, the SCL emissions moved along specific paths and formed branch-like streamers. At the beginning of the ultrasound irradiation, cavitation bubbles generated SCL in both the pre-focal and the post-focal region. When the electrical power or the sonication time increased, the SCL in the post-focal region increased and became higher than that in the pre-focal region. The intensity of SCL in the focal region is usually the weakest because of “oversaturation”.The spatial distribution of SCL near a tissue boundary differed from that obtained in free fields. It organized into special structures under different acoustic amplitudes. When the electrical power was relatively low, the SCL emission was conical shape which suggested a standing wave formation at the tissue-fluid boundary. When the electrical power exceeded a certain threshold, only a bright spot could be captured in the focus. The cavitation bubbles which centralized in the focus concentrated energy and hindered the formation of standing waves. With rising electrical power at high levels, besides a bright spot in the focus, there were some irregular light spots in pre-focal region, which indicated some cavitation bubbles or small bubble clusters achieved the threshold of SCL and induced the reaction with the luminol solution.     

复原力在SCL-90阳性症状学生心理健康的作用

采用GHQ-20，SDS，AS，ASLEC和大学生复原力量表对190名SCL-90阳性症状大学生进行问卷调查；结果表明复原力显著正向预测SCL-90阳性症状大学生的心理健康水平（B=-0．647，P〈0．001）；复原力在SCL-90阳性症状生活事件与心理健康间有显著调节作用．因此，通过提高SCL-90阳性症状大学生复原力水平可以提高其心理健康水平．     

一种基于SCL结构的差分型PFD

提出一种差分型鉴相／频器(PFD),此鉴相／频器可以大幅度降低死区现象,并且可以避免UP和DN信号同时为逻辑高电平,从而减小电荷泵电流失配对整个环路的影响,降低环路的假频效应．这种差分型PFD在高速、低抖动、低假频PLL中有着广泛的应用．该电路基于Chartered 0．25μmCMOS工艺,并用Hspice进行仿真,仿真结果表明,该PFD死区小于20ps,并且可以大大降低VCO控制电压的纹波．     

军校学员的心理健康分析

本文使用分层聚类和Fisher判别等统计学方法对军校学员的心理健康状况进行统计分析。根据我校军人健康中心收集到的测查数据 ,分析了聚为不同类的学员的在心理健康方面所存在的差异与联系 ,得到了判别函数 ,为对不同学员进行针对性的心理健康教育提供了科学依据