WDER650钛成分控制工艺改进及应用

武钢第二炼钢厂冶炼WDER650时钛成分不合格必须回炉。原来冶炼WDER650的工艺路线是：转炉出钢过程中，FeTi随其它合金一起加入到大罐，钢水出完后到吹氩站微调成分。由于不同炉次钢水氧化性强弱不同，FeTi收得率不稳定，成分波动较大，在吹氩站调整时仍有钛成分调整不当，导致钛低回炉及钛成分在边缘值的炉数较多。改进后的工艺路线为：出钢前进行预脱氧，出完后到吹氩站加铝线吹氩，钢水氧含量大大降低，再加入FeTi，收得率非常稳定，获得了良好的效果。     

Synthesis and Characterization of Nickel Nanorods Transferred from Hydrotherally Decomposed Rod-like NiS

Powders of hexagonal-structured single-crystalline nickel sulfide nanorods have been synthesized in cetyltrimethy ammonium bromide （CTAB）/water/hexane/n-pentanol quaternary microemulsion under hydrothermal conditions by using the reaction of carbamide and carbon disulfide as a sulfide source. Single-crystalline nickel nanorods have been synthesized via thermal decomposition by using single-crystalline nickel sulfide nanorods as precursor. The influence of different reaction parameters on the morphology of the products has been investigated. The structure, morphology and magnetic properties of the products were characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM）, calorimeter （TGA-DSC） and vibrating sample magnetometer showed that the specific saturation magnetization （σs） and 37.5 emu/g and 68.50e, respectively. thermogravimetric analysis-differential scanning （VSM）. The results of coercivity values （Hc） magnetic measurements of nickel nanorods were     

Optimal bidirectional associative memories

This paper proposes a model for linear optimal bidirectional associative memories (BAMs), in which the design of the weight matrix is based on a least-squares cost functional. The minimization of the functional leads to a Lyapunov-type matrix equation. The mathematical properties of such an optimal bidirectional system are studied in detail. Simulations are conducted for the bidirectional association of pattern pairs with grey levels. It is shown that this optimal design of BAM is effective for memorizing patterns with grey levels.     

3D Ln–Ag (Ln = Nd; Eu) coordination polymers based on N- and O-donor ligands: Synthesis, crystal structures and luminescence

The self-assembly of isonicotinic acid with metal salts under hydrothermal conditions gave two isostructural 3D 4d–4f coordination polymers, Ln₂Ag₄(OX)(IN)₆(H₂O)_1.5 · 2(ClO₄) [Ln = Nd (1); Eu (2), OX = oxalic acid, IN = isonicotinic acid]. Compounds 1 and 2 are 3D coordination frameworks via 2D layers built by carboxylate groups of isonicotinic acid and oxalate ligands coordinating to metal centers and completing the linear linker by silver ions. Furthermore, the luminescent properties of complex 2 have also been investigated.     

Lateral Current Confinement Determines Silicon Avalanche Transistor Operation in Short-Pulsing Mode

The transient in a Si bipolar junction transistor was investigated in high-current short-pulsing ( 2 ns) mode both experimentally and numerically. A comparison of measured and simulated waveforms clearly showed that only a small fraction of the perimeter of the emitter-base interface (in the lateral direction) takes part in the switching transient when a capacitor of relatively small value (80 pF) is discharged across the transistor to obtain a current pulse of a few nanoseconds in duration. A good agreement was found between measurements and simulations in the 2-D numerical model when the effective operating perimeter was used as a parameter in the model. The results allowed reliable analyses of the thermal regime to be performed. Possible reasons for the significant current confinement in short-pulsing mode and relatively homogeneous transistor switching with longer current pulses are discussed, and a mechanism of fast lateral turn-on spread is assumed. One conclusion of practical importance is that a short-pulsing relatively high-current mode could not be realized without current confinement in the lateral direction.     

埋地传感器道面检测技术在大学生创新创业训练项目中的应用

在机场道面的教学过程中,出于对机场运行安全的考虑,学生往往不能到现场进行道面检测,实践应用环节欠缺。为此,提出新的教学方法,引导学生研发了一种机场道面检测埋地传感器组件,并应用该组件进行道面检测试验,分析机场道面状况及其力学性能参数的变化,从而对道面的整体性能进行评价。实践证明,通过埋地传感器的研发及应用,学生的技术创新及实践应用能力得到提升。在新的教学模式下,通过问题导向的方法,激发学生的创造性思维,引导学生解决问题,理论与实践相结合,大大提高学生的操作应用能力,有益于培养学生的创新实践能力。     

KDR基因遗传变异对贝伐珠单抗一线治疗晚期非小细胞肺癌患者临床疗效的影响

目的: 本研究旨在探讨激酶插入区受体（KDR）基因遗传变异对贝伐珠单抗联合化疗治疗晚期非小细胞肺癌（NSCLC）患者疗效的影响。方法:本研究纳入135例一线接受贝伐珠单抗治疗的NSCLC患者,收集外周血及活检癌组织标本分别用来进行基因分型及表达测定。多态性位点的基因型和其他变量的相关性通过logistic回归模型进行分析。基因型和预后的单变量分析用Kaplan-Meier生存分析方法,并通过Cox风险比例模型对其他变量进行校正。结果:在KDR的标记多态性位点中,只发现了V297I位点的临床意义。V297I位点位于该基因的编码区,在研究人群的基因分布频率为：CC型99例（73.33%）,CT型33例（24.44%）,TT型3例（2.23%）,最小等位基因频率为0.14,三种基因型分布频率符合哈迪温伯格平衡（P=0.898）。后期比较将TT型和CT型患者合并,对不同基因型患者进行疗效分析发现：CT/TT基因型患者和野生型CC型患者的客观缓解率（ORR）分别为41.67%和47.47%（P=0.549）。CT/TT和CC基因型患者的中位无进展生存期（mPFS）分别为6.2和8.6个月,差异具有统计学意义（P=0.003）。在总生存期（OS）方面,两种基因型患者的中位总生存期（mOS）分别为18.9和21.5个月,差异具有统计学意义（P=0.017）。对无进展生存期（PFS）构建多变量的Cox模型校正之后发现CT/TT基因型对PFS的影响仍然具有统计学意义（OR=1.95,P=0.019）。另外,进一步在68例癌组织标本的表达分析中发现,CT/TT基因型患者相对于野生型的CC型患者,癌组织中KDR的表达明显较高,且差异具有统计学意义（P<0.01）。结论:在接受贝伐珠单抗治疗的非小细胞肺癌患者中,KDR基因V297I位点可能通过影响KDR基因的表达从而影响贝伐珠单抗一线治疗非小细胞肺癌患者的疗效。     

Fabrication of multiwalled carbon nanotubes with polymer shells through surface RAFT polymerization

A core–shell hybrid nanostructure, possessing a hard backbone of multiwalled carbon nanotubes (MWNTs) and a soft shell of brush‐like poly(methyl methacrylate), has been successfully prepared via a reversible addition–fragmentation chain transfer (RAFT) process using a RAFT agent immobilized on MWNTs. Polymer‐modified MWNTs are easily dispersed in good solvents for the grafted polymer, such as toluene, tetrahydrofuran and CHCl₃. This observation has been confirmed by transmission electron microscopy analysis. The content of polymer in the functionalized MWNTs can be well controlled by the feed ratio. It is believed that realizing these hybrid structures, on the basis of such simple grafting, will pave the way for the design, fabrication, optimization and eventual application of more functional carbon nanotube‐related nanomaterials. Copyright © 2007 Society of Chemical Industry     

郑408火烧驱油注气井油管腐蚀与防护

文章对胜利油田郑408火烧驱油注气井油管腐蚀产物进行了X射线衍射分析(XRD)和电子探针显微分析(EPMA),初步认定:上部管柱主要是氧腐蚀;下部腐蚀严重部位为氧加速的酸性垢下腐蚀穿孔。实践表明,“钛纳米聚合物防腐蚀涂层油管”和“镀钨合金防腐蚀油管”在上述环境使用较为适合;同时应注意郑408井如再需压井作业,可以同时注入缓蚀剂来减缓压井液对油、套管的腐蚀。