无后处理钢铁常温发黑新工艺及机理

本文介绍无后处理钢铁常温发黑剂的组成，作用及工艺，综合测试了发黑膜的性能及氧化还原的动电位曲线和发黑过程的电位－时间曲线，借助电镜扫描分析了发黑膜的形貌，提出了可能的机理。     

Distortional Properties of the Bijective Pattern Map (Part II: Change of Reference)

This is the part n of the study of distortion property of the Bijective Pattern Map maps. In part I, the generic distortion was presented. In this article, the distortion using different set of reference points and pre - image is compared with the result in part I. Moreover, the distortion induced by a change of reference is illustrated with examples. The formulation of the relationship between the distortion and the Gaussian curvature will be followed.     

平台-平台惯性系统传递对准技术

分析了平台-平台系统传递对准技术与捷联-捷联系统传递对准技术的差异,在此基础上,推导了平台-平台传递对准中主、子惯导系统速度误差方程和框架角误差方程,建立了平台-平台传递对准数学模型,给出了角速度与角加速度的获取方法,设计的低通滤波能够有效抑制角速度与角加速度中的高频噪声。仿真计算表明,基于速度与框架角匹配的平台-平台传递对准方法能够得到优于0.15°的对准精度。     

复合材料Terfenol-D/PMNT的磁电和逆磁电响应

给出了Terfenol-D/PMN-PT/Terfenol-D(TD/PMNT/TD)和PMNT/TD/PMNT两种层状复合材料的磁电和逆磁电响应的测试方法和测试结果. 这两种复合结构的优化直流偏置磁场大小均为350 Oe(1 Oe=79.58 A/m). 在1 kHz频率下, 这两种复合材料的最大磁电电压系数分别为384 mV/Oe和158 mV/Oe, 最大逆磁电系数分别为118 mG/V和162 mG/V (1 G = 10^-4 T). 另外研究了这两种复合材料在谐振频率下的磁电响应. 通过对两种复合结构的比较得知, 磁致/压电/磁致复合结构具有好的磁电响应; 而压电/磁致/压电复合结构具有好的逆磁电响应. 这一结果有助于优化设计高性能压电/磁致复合磁电材料.     

'Rejuvenation' protects neurons in mouse models of Parkinson's disease

Why dopamine-containing neurons of the brain's substantia nigra pars compacta die in Parkinson's disease has been an enduring mystery. Our studies suggest that the unusual reliance of these neurons on L-type Ca(v)1.3 Ca2+ channels to drive their maintained, rhythmic pacemaking renders them vulnerable to stressors thought to contribute to disease progression. The reliance on these channels increases with age, as juvenile dopamine-containing neurons in the substantia nigra pars compacta use pacemaking mechanisms common to neurons not affected in Parkinson's disease. These mechanisms remain latent in adulthood, and blocking Ca(v)1.3 Ca2+ channels in adult neurons induces a reversion to the juvenile form of pacemaking. Such blocking ('rejuvenation') protects these neurons in both in vitro and in vivo models of Parkinson's disease, pointing to a new strategy that could slow or stop the progression of the disease.     

带漂移布朗运动的一个局部时的Laplace变换

在Borodin和Salminen(2002)文献中有关带漂移布朗运动占位时的Laplace变换结果的基础上,运用Li等(2014)计算局部时的方法,推出了带漂移布朗运动在独立指数时间e_q前,及停留在0处的局部时的Laplace变换表达式Ee~(-λl(e_q,0))=lima→0I(λ/a;0,a,e_q)=((2q+μ~2)~(1/2))/(λ+(2q+μ~2)~(1/2))。当μ=0时,本文结果与标准布朗运动的结果吻合。     

一种用于层间预测的自适应插值方法

为消除可分级视频编码中的层间冗余,提出了一种用于可分级视频编码层间预测的自适应插值方法.用于亮度信息的插值滤波器根据量化参数从3种滤波器中选择,包括双线性滤波器、双三次滤波器和六抽头滤波器;对色度信息进行插值时,使用双线性滤波器代替联合可分级视频编码模型(JSVM)使用的六抽头滤波器.实验结果表明,与JSVM所使用的固定插值滤波器相比,提出的自适应插值方法性能提高0.05dB,同时改善了重建视频中快速运动物体的主观质量.     

ICOS is essential for effective T-helper-cell responses

The outcome of T-cell responses after T-cell encounter with specific antigens is modulated by co-stimulatory signals, which are required for both lymphocyte activation and development of adaptive immunity. ICOS, an inducible co-stimulator with homology to CD28, is expressed on activated, but not resting T cells, and shows T-cell co-stimulatory function in vitro. ICOS binds specifically to its counter-receptor B7RP-1 (refs 5,6,7), but not to B7-1 or B7-2. Here we provide in vivo genetic evidence that ICOS delivers a co-stimulatory signal that is essential both for efficient interaction between T and B cells and for normal antibody responses to T-cell-dependent antigens. To determine the physiological function of ICOS, we generated and characterized gene-targeted ICOS-deficient mice. In vivo, a lack of ICOS results in severely deficient T-cell-dependent B-cell responses. Germinal centre formation is impaired and immunoglobulin class switching, including production of allergy-mediating IgE, is defective. ICOS-deficient T cells primed in in vivo and restimulated in vitro with specific antigen produce only low levels of interleukin-4, but remain fully competent to produce interferon-gamma.     

超滤对大蒜粗多糖中蛋白质的脱除效果

研究了超滤对大蒜粗多糖中蛋白质的脱除效果．选择截留相对分子质量为10000的超滤膜（MWCO）,并研究了超滤次数、操作压力、样品浓度和膜的清洗方式对超滤效果的影响．结果表明：利用该超滤膜来脱除大蒜粗多糖中蛋白质的最佳条件为：大蒜多糖的质量浓度20mg／mL,压力27．58kPa,超滤3次．该条件下大蒜多糖通过率达到92．1％,蛋白质含量由O．5％降低到了0．05％．超滤膜使用后,不经清洗,再次使用,大蒜多糖的通过率为74．7％,为原通过率的78．1％;经蒸馏水一Na0H溶液一蒸馏水混合清洗后,大蒜多糖的通过率为93．2％,恢复到原通过率的97．5％．结论：采用超滤法可以脱除大蒜粗多糖中的蛋白质．