Utilizing sensor data to model students’ creativity in a digital environment

While creativity is essential for developing students’ broad expertise in Science, Technology, Engineering, and Math (STEM) fields, many students struggle with various aspects of being creative. Digital technologies have the unique opportunity to support the creative process by (1) recognizing elements of students’ creativity, such as when creativity is lacking (modeling step), and (2) providing tailored scaffolding based on that information (intervention step). However, to date little work exists on either of these aspects. Here, we focus on the modeling step. Specifically, we explore the utility of various sensing devices, including an eye tracker, a skin conductance bracelet, and an EEG sensor, for modeling creativity during an educational activity, namely geometry proof generation. We found reliable differences in sensor features characterizing low vs. high creativity students. We then applied machine learning to build classifiers that achieved good accuracy in distinguishing these two student groups, providing evidence that sensor features are valuable for modeling creativity.     

Thermal conductance measurements of bolted copper to copper joints at sub-Kelvin temperatures

We have measured the thermal contact conductance of several demountable copper joints below 1 K. Joints were made by bolting together either two flat surfaces or a clamp around a rod. Surfaces were gold plated, and no intermediate materials were used. A linear dependence on temperature was seen. Most of the measured conductance values fell into a narrow range: 0.1-0.2 W K⁻¹ at 1 K. Results in the literature for similar joints consist of predictions based on electrical resistance measurements using the Wiedemann-Franz law. There is little evidence of the validity of this law in the case of joints. Nevertheless, our results are in good agreement with the literature predictions, suggesting that such predictions are a reasonable approximation.     

酸化返出液中分离出的原油脱水时电脱水器跳闸原因及对策

海上油井酸化后,油井返排液沉降分离得到含酸原油,后者进入电脱水器后常引起电脱水器跳闸。其原因是含酸原油(油包水型乳状液)的电导率过高,超过了电脱水器的安全工作电导率κw。对于现场所用的电脱水器,由设计参数计算出κw=0.43μS/cm。从某海上油田3口油井酸化后不同时间的返排液共取样40份,随机选出13份,沉降分离后得到13份含酸原油样,测得电导率范围在0.03～10000μS/cm。认为原油的含水率(应<18%)不是引起跳闸的原因,跳闸的主因是含酸原油的高电导率。研制了一种油溶性的碱性添加剂,其化学成份是碱金属、碱土金属氧化物或氢氧化物,以浓溶液形式加入含酸原油中,可使电导率降至κw以下。加入量由实验确定。表2参2。     

场效应管设计

本文概述了场效应管的分类和设计。设计按常规程序考虑，特殊的ＭＯＳ管还要考虑相关许多其它因素，以及理论与实践结合后的取舍。     

Children's Physiological Indices of Empathy and Their Socioemotional Adjustment: Does Caregivers' Expressivity Matter?

Relations of heart rate and skin conductance reactions to mildly evocative empathy-inducing slides with socioemotional functioning were examined for 154 children (mean age = 9 years, 5 months). In addition, maternal expressivity was tested as a moderator of these relations. Parents and teachers rated children's socioemotional functioning, and a behavioral measure of children's regulation was obtained. Boys who exhibited higher skin conductance and higher heart rate to slides depicting negative emotions were better regulated, less emotionally intense, and better adjusted than their peers. Furthermore, boys' regulation and adjustment were positively related to such physiological responding to negative slides if maternal negative expressivity was relatively low or moderate, but not high. Fewer findings were obtained for girls or for positive slides. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Transport properties in a mixed inorganic ion exchanger—zirconium phosphomolybdate—in comparison to its single salt counterparts

Amorphous inorganic ion exchangers zirconium phosphate, zirconium molybdate and zirconium phosphomolybdate have been prepared and characterized by elemental analysis, TGA, FTIR and surface area measurements. The protonic conductivity in these materials were determined at various temperatures and compared. It was found that the mixed material zirconium phosphomolybdate showed maximum conductivity at all temperatures.     

单电子晶体管电导振荡及其解释

文中概述了单电子晶体管电导振荡的特点并进行了理论解释，进而讨论了介观电容及电容谱的概念。     

NiMnFeO_4的制备与性能研究

采用 (NH4) 2 C2 O4为沉淀剂 ,基于共沉淀法制备了NiMnFeO4NTC热敏陶瓷 ,用TG、XRD、SEM、电导率测量等方法对前驱体、氧化物粉体及NTC陶瓷样品的进行了表征。结果表明 ,用此种方法制备的NTC陶瓷 ,其结构均匀、致密 ;烧结后经随炉冷却的样品 ,在 15 0℃老化 10 0 0h后 ,电阻漂移小于 1% ;而在 115 0℃下淬火的样品在同样的条件下 ,电阻漂移大于 4 %。     

铁电薄膜存储器底电极Pt/Ti的制备及性能研究

应用射频磁控溅射方法 ,在Si基片上采用不同的溅射工艺制备了铁电薄膜底电极Pt/Ti,并分析了在不同温度下退火后材料的电导率性能和粘结力性能 ,从理论和实验上分析了不同的溅射工艺和退火处理对底电极性能的影响。