降解黑荆树栲胶抑菌性能的研究

将黑荆树栲胶用过氧化氢进行氧化降解,GPC测得降解产物数均相对分子质量为 980,红外光谱表明该产物含有酚羟基、酯基以及甲基。该降解产物对大肠杆菌、枯草芽孢杆菌、金黄色葡萄球菌、巨大芽孢杆菌、志贺氏痢疾杆菌的最低抑菌浓度分别为0.05%、0.03%、0.03%、0.03%、0.05%,抑菌性能与原黑荆树栲胶相比有较大的提高。     

深度降解橡胶改性沥青的流变性能

针对传统橡胶沥青混溶速度慢、黏度大、加工难度高和掺量低等问题,采用螺杆反应挤出法对橡胶粉进行深度降解(溶胶质量分数大于50%),使其能在低温下快速混溶于沥青改性.结合常规测试和动态流变学分析研究了橡胶粉来源、掺量对使用温度下沥青流变性能和加工流变性能的影响.结果表明:深度降解橡胶粉能较快分散于沥青中;橡胶粉来源、掺量可影响改性沥青的高低温流变性能及加工流变性能;在不显著增加改性沥青黏度的情况下,深度降解橡胶粉的掺量(质量分数)可达50%以上.     

Degraded contingency revisited: Posttraining extinction of a cover stimulus attenuates a target cue's behavioral control.

In a Pavlovian conditioning situation, unsignaled outcome presentations interspersed among cue-outcome pairings attenuate conditioned responding to the cue (i.e., the degraded contingency effect). However, if a nontarget cue signals these added outcomes, responding to the target cue is partially restored (i.e., the cover stimulus effect). In 2 conditioned suppression experiments using rats, the effect of posttraining extinction of the cover stimulus was examined. Experiment 1 found that this treatment yielded reduced responding to the target cue. Experiment 2 replicated this finding, while demonstrating that this basic effect was not due to acquired equivalence between the target cue and the cover stimulus. These results are consistent with the extended comparator hypothesis interpretation of the degraded contingency and cover stimulus effects. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Degradation of the surface layers of superalloys and thermal-fatigue damage to the structural elements of gas-turbine engines

We study the phase composition, the structure of the surface degraded layer, and the concentrations of elements of a directionally crystallized superalloy tested in a high-temperature gas flow. The dependences of the degree of damage to the surface layer on the level of thermal stresses are established. __________ Translated from Problemy Prochnosti, No. 5, pp. 72–80, September–October, 2008.     

聚丙烯粉料生产中的质量控制

分析了间歇液相本体法聚丙烯生产中的质量问题 ,重点讨论了聚丙烯粉料生产中块料、黑料及降解料产生的原因 ,并提出预防措施     

黑加仑果实降解多糖理化特性、结构及体外降血糖活性

本实验以微波辅助溶剂法提取的黑加仑果实多糖为原料，采用超声辅助Fe2＋-VC-H2O2降解，经Sepharose 6B柱层析法分离，得到两种多糖（DP-1和DP-2）。经液相色谱测定DP-1和DP-2分子质量分别为1.29×106 Da和1.07×106 Da；气相色谱测定结果表明，DP-1和DP-2由相同的6 种单糖构成，但组成比例不同。傅里叶变换红外光谱、高碘酸氧化及核磁共振分析结果表明，DP-1和DP-2糖链上都含有α-、β-吡喃环，且主要是由6 种糖残基构成。功能特性测定结果显示DP-1和DP-2具有一定的吸湿性、保湿性及热稳定性。活性实验结果证实多糖DP-1和DP-2对α-葡萄糖苷酶和α-淀粉酶具有显著的抑制活性，质量浓度为2.0 mg/mL时，对α-葡萄糖苷酶抑制率最高，分别为（67.45±3.45）%和（73.22±0.48）%；对α-淀粉酶抑制率也最高，分别为（64.74±2.08）%和（73.28±2.52）%。此外，两种多糖对α-淀粉酶的抑制属于可逆竞争型。本研究可为黑加仑果实多糖的进一步利用提供理论参考。     

Ultra‐wideband multiple‐access relay channel with correlated noises and its diversity analysis

In this study, we investigate a new and practical model, ultra‐wideband Slepian–Wolf multiple‐access relay channel (UWB‐SW‐MARC) with correlated noises at the relay and receiver, which includes two important models, that is, UWB‐SW multiple‐access channel with correlated noises and UWB relay channel with correlated noises, as its special cases. We derive a general rate region for UWB‐SW‐MARC and obtain an outer bound for this model and, thereby, prove two certain capacity theorems for two important and different classes of MARC. Also, we analyze outage probability and diversity gain as the practically important concepts in wireless communications and prove that adding a relay to the multiple‐access channel improves the diversity gain. Finally, we evaluate some results numerically and illustrate that the noise correlation coefficient plays an important role in determining the relay position, and show that the channel performance depends on the noise variances. Copyright © 2014 John Wiley & Sons, Ltd.     

一种HSGPS接收机的设计与验证

分析了GPS弱信号的特点,探讨了只存在NLOS型信号时影响GPS定位的主要技术因素。以u-blox公司的LEA-5S为基础,设计和验证了针对弱信号环境下车辆定位的HSGPS接收机。最后,通过测试其启动的TTFF和定位准确度,论证了HSGPS接收机设计及弱信号环境下定位车辆应用的可行性。     

基于降解秸秆的解纤维梭菌与活性污泥的人工菌系研究

通过汽爆、粉碎2种不同预处理方法处理秸秆,并用解纤维梭菌与活性污泥所构的人工菌系对其进行降解,通过比较秸秆的降解率及人工菌系的产气率,分析不同接种顺序对发酵体系的影响。试验结果表明,先接种解纤维梭菌或同时接种解纤维梭菌和活性污泥的降解效果及产气率都要大于先接种活性污泥的菌系。