低气味低密度高回弹MDI泡沫的研究

以高活性聚醚多元醇和改性MDI为主要原料,选择反应性催化剂和低挥发性硅油,配合使用物理发泡剂和水发泡剂,开发出了低气味低密度高回弹泡沫.该泡沫具有气味小、密度小、回弹性好、承载性高、舒适性好及综合性能佳等优点.     

第3讲 公用电网谐波标准

介绍谐波的基本概念、谐波的危害;对现行国家标准GB/T 14549- 93《电能质量 公用电网谐波》中不同谐波源的叠加计算、用户注入电网的谐波电流允许值等几个基本问题进行了说明:指出现行国标中存在的主要问题,以及标准修订中正在考虑的几个问题:提出减少谐波危害应优先对谐波源本身或在其附近采取适当的技术措施.     

氢化松香/丙烯酸酯复合细乳液的制备及其性能研究

以氢化松香(HR)作为增黏树脂,采用细乳液聚合法制备了HR/丙烯酸酯复合细乳液。探讨了乳化剂、HR等因素对该乳液及其胶膜性能的影响。结果表明:与常规乳液聚合相比,细乳液聚合制得的乳液粒径更小、粒径分布更窄、单体转化率更高、凝聚率更低、Zeta电位更高且体系更稳定;HR能有效改善PSA(压敏胶)的粘接性能,并且当w(HR)=5%时,PSA的初粘力(9#钢球)、180°剥离强度(11.2 N/25 mm)和持粘力(47 min)相对较好。     

超超临界电站锅炉用新型管材的研制

介绍了我国电站锅炉向大容量、高参数发展趋势和对新型管材的要求,以及宝钢T23,T91,T92高压锅炉管新产品研制情况.经评定表明,宝钢T23,T91,T92各项技术指标和性能均符合ASME SA-213标准要求,可以替代进口产品,适合制造超超临界电站锅炉.同时,为了满足超超临界电站锅炉屏式过热器、高温过热器、高温再热器关键材料国产化的要求,宝钢又开展了S30432(Super304H)及TP310HNbN(HR3C)钢的研制,并可在近期提供给锅炉行业,以满足锅炉行业制造超超临界电站锅炉的需求.     

Current Methods for Recombination Detection in Bacteria

The role of genetic exchanges, i.e., homologous recombination (HR) and horizontal gene transfer (HGT), in bacteria cannot be overestimated for it is a pivotal mechanism leading to their evolution and adaptation, thus, tracking the signs of recombination and HGT events is importance both for fundamental and applied science. To date, dozens of bioinformatics tools for revealing recombination signals are available, however, their pros and cons as well as the spectra of solvable tasks have not yet been systematically reviewed. Moreover, there are two major groups of software. One aims to infer evidence of HR, while the other only deals with horizontal gene transfer (HGT). However, despite seemingly different goals, all the methods use similar algorithmic approaches, and the processes are interconnected in terms of genomic evolution influencing each other. In this review, we propose a classification of novel instruments for both HR and HGT detection based on the genomic consequences of recombination. In this context, we summarize available methodologies paying particular attention to the type of traceable events for which a certain program has been designed.     

Role of Intrinsic Subtype Analysis with PAM50 in Hormone Receptors Positive HER2 Negative Metastatic Breast Cancer: A Systematic Review

Endocrine therapy (ET), associated with CDK 4/6 inhibitors, represents the first choice of treatment for HR+/HER2- metastatic breast cancer (mBC). Primary or secondary endocrine resistance could develop; however validated biomarkers capable of predicting such a conditions are not available. Several studies have shown that HR+/HER2- mBC comprises five intrinsic subtypes. The purpose of this systematic review was to analyze the potential correlations between intrinsic subtype, efficacy of treatment, and patient outcome. Five papers that analyzed the intrinsic subtype with PAM50 assay in patients (pts) with HR+/HER2- mBC treated with ET (alone or in combination) within seven phase III clinical trials ({"type":"entrez-protein","attrs":{"text":"EGF30008","term_id":"327544443","term_text":"EGF30008"}}EGF30008, BOLERO-2, PALOMA-2,3, MONALEESA-2,3,7) were identified. Non-luminal subtypes are more frequent in endocrine-resistant pts and in metastatic sites (vs. primary tumors), have less benefit from ET, and worse prognosis. Among these, HER2-enriched subtypes are similar to HER2+ tumors and benefit from the addition of anti-HER2 agents (lapatinib) and, for less clear reasons, of ribociclib (unconfirmed data for palbociclib and everolimus). Basal-like subtypes are similar to triple-negative tumors, making them more sensitive to chemotherapy. The intrinsic subtype is also not static but can vary over time with the evolution of the disease. Currently, the intrinsic subtype does not play a decisive role in the choice of treatment in clinical practice, but has potential prognostic and predictive value that should be further investigated.     

基于TDM-EfficientPhys的人脸视频HR检测方法

为了实现高精度的人脸视频心率(heart rate, HR)检测,本文提出了一种基于改进EfficientPhys网络的人脸视频HR检测方法：TDM-EfficientPhys。首先,引入时间导数网络(temporal derivative network, TDM-Net),有效地保留了远程光电容积脉博波描记术(remote photoplethysmography, rPPG)信号的时间特征。然后,调整EfficientPhys的Dropout参数,嵌入残差结构,有效地避免梯度消失和网络退化问题,并且将TDM-Net和改进后的EfficientPhys网络以跳跃连接的方式实现时序和空间信息的特征融合,提高检测精度。最后,使用两个公开的数据集PURE和UBFC-rPPG来验证本文所提出模型的有效性,实验表明,本文方法测试的均方根误差(RMSE)降低至2.387,平均绝对误差(MAE)降低至2.040,与现有的模型相比,本文方法显示了更好的网络性能和更精准的HR。     

产业集群特征对集群内人才根植意愿的影响——基于我国四个产业集群的一项实证研究

通过文献回顾与理论推理,提出产业集群特征与集群内人才根植意愿的关系模型,并以武汉光谷、北京中关村、苏州工业园区、东莞振安工业园四个产业集群为对象进行实证分析.运用验证性因素分析、方差分析、回归分析以及优势分析等方法处理数据.研究发现:集群经济、集群人才政策和集群文化三个维度对人才根植意愿有显著的正向影响,其影响程度从大到小依次为集群人才政策、集群经济、集群文化;不同职务、不同年龄的人才其根植意愿具有显著差异;集群生活环境、性别、学历对集群内人才根植意愿没有显著影响.     

电子就业中介中的匹配研究

研究了电子就业中介中公司学生的双边匹配问题,并基于HR算法(医学院实习生与医院相互选择算法[1])建立了电子就业中介的工作流程模型。以交易双方总满意度分别最大为目标,建立了多目标指派模型,从而解决了传统HR算法的匹配公平性问题。以等权重的线性加权方法将问题化为单目标求解。仿真实验表明,该多目标算法虽不能保证匹配稳定性[2],但在匹配数量上优于HR算法。     

移动点对象HR索引及反向最近邻查询

在此提出了一种基于速度分布的HR树索引结构,首先在速度域中对移动对象集进行规则划分,根据速度标量大小将移动对象划分到不同的速度树中,每棵速度树中移动对象具有相近的速度;对每棵速度树中的移动对象,则利用时间间隔进行划分。HR树索引增加了两个分别建于叶节点和根节点之上的Hash辅助索引结构,并基于HR树提出了反向最近邻查询算法,具有很好的动态更新性能和并发性。实验结果与分析表明,基于HR树索引的反向最近邻查询算法具有良好的更新及查询性能,优于通用的TPR树索引。