In vitro and in vivo mineralization and osseointegration of nanostructured Ti6Al4V

Surface characteristics of the orthopedic implants remarkably affect the corresponding biological responses. In this study, Ti6Al4V alloy was subjected to the surface mechanical attrition treatment (SMAT) in order to achieve favorable surface properties. The SMAT substrates exhibited a highly hydrophilic surface with nanograins about 20–40 nm. Then, the in vitro and in vivo mineralizations were evaluated on the untreated and SMAT processed substrates. The in vitro experimental results showed a significant increase in the deposition of calcium-containing minerals on the SMAT surface both with and without osteoblasts. The in vivo experiments also revealed a higher bone mineral apposition on the SMAT processed implants after 8 and 12 weeks post operation. The well-organized bone formation on the SMAT substrates indicated an enhanced osseointegration on the bone-implant interface. Therefore, it was suggested that the obvious improvements of biomineralization and osseointegration were attributed to the nanostructure features on the SMAT surface, as well as the higher surface hydrophilicity.     

Infrared Image Series Automatic Registration and a History & Tendency Analysis

Infrared camera has been widely used in electrical power systems for predictive and preventive thermal fault diagnosis. Without historical IR images being considered, most thermograph analysis used at present are concerned with static image. The dynamic history and tendency analysis which compares the newly taken image with historical images is particularly attractive. Conclusions can be drawn from temperature variations rather than just from anomalous thermal pattern. However the spatial distortions prevent such dynamic analysis from being practicable. So the need to register infrared images arises. This paper proposes an automatic registration algorithm based on closed temperature contour matching for infrared image series of a target equipment taken at different times. Centroid Distance Function is used in image registration for the first time. The algorithm can remove spatial distortions, bring temperature variations into prominence and endow infrared camera with dynamic analysis ability. Experiment shows that the algorithm is simple, effective and extensible.     

Pump-to-Stokes transfer of relative intensity noise in Brillouin fiber ring lasers

We have experimentally investigated pump-to-Stokes intensity noise transfer in both the frequency domain and the time domain in all-fiber single-frequency Brillouin ring lasers. In the high-frequency region (>1MHz), the pump-to-Stokes noise transfer function can be much smaller than unity, indicating that the Brillouin fiber lasers act as an efficient low-pass filter. The maximum noise reduction of 40-60 dB was observed at antiresonant frequencies that are multiples of half the cavity free spectral range. This is the first experimental demonstration, to the authors' knowledge, of intensity noise reduction in Brillouin fiber lasers.     

改性膨胀土路堤填筑含水量优化试验研究

在控制含水量的前提下,对分别掺入不同量石灰、不同量水泥改性膨胀土试件进行强度和膨胀量试验,得到不同含 水量及不同石灰(水泥)掺量对改性膨胀土强度和膨胀性的影响,通过对实验所得数据的分析,找出含水量和掺石灰(水泥)剂 量的最佳融合点,并据此对膨胀土路堤填料的改性施工提出了一些有益的建议。     

分子工程学

分子工程学以体系的功能为导向,在分子水平上进行结构设计与施工,探索功能、结构与合成三者之间的关系原理,发展合成、制备与组装方法学,研究结构基元本征性质和构效关系。本文讨论了建设分子工程学这一新学科的重要性,介绍了自发单层分散原理与CO吸附剂、纳米结构光电功能体系、金属纳米簇基催化剂、表面分子多孔网络的精确可控组装以及功...     

多孔晶体材料的分子工程学研究

功能无机晶体材料的定向设计与合成是化学及材料科学领域中一项重要的前沿课题。本文介绍了近十几年来我们在多孔晶体材料,主要包括分子筛和金属有机骨架晶体材料的分子工程学研究方面所取得的一些进展。其中包括提出了定向设计具有特殊孔道结构和特殊计量比分子筛多孔骨架结构的计算机方法;在国际上率先建立了分子筛多孔晶体材料合成与结构数据...     

气相色谱法测定DNT废酸、废水中的甲苯及硝基甲苯等含量

研究气相色谱在测定废水、废酸中甲苯、硝基甲苯含量方面的应用.根据相关标准及废酸、废水处理的实际情况确定最佳的实验条件,废水样12次测定结果的相对标准偏差小于0.5％,加标回收率为98.31％.该法测定结果精确度高,适合DNT废酸、废水处理的分析监控.     

(NH4)6[Mn3B6P9O36(OH)3]·4H2O: a new open-framework manganese borophosphate synthesized by using boric acid flux method

A new three-dimensional (3-D) open-framework manganese borophosphate, (NH(4))(6)[Mn(3)B(6)P(9)O(36)(OH)(3)]·4H(2)O (denoted as MnBPO-CJ31), has been synthesized by using boric acid flux method. Its anionic framework structure is constructed by the connection of MnO(6) octahedra and BO(4), PO(4) and PO(3)(OH) tetrahedra. It contains 12-ring channels along the [001] direction with a pore diameter of 7.1 ?. It is the first borophosphate featuring a 3-D anionic partial structure with a B/P ratio of 2/3 and an unprecedented fifteen mer tetrahedral fundamental building unit (FBU) [B(6)P(9)O(36)(OH)(3)] exists in this compound. NH(4)(+) ions locate in the void space to balance the negative charge of the inorganic framework. The compound is further characterized by powder XRD, ICP, CHN, TGA and IR analyses. Magnetic study reveals that MnBPO-CJ31 shows interesting canted antiferromagnetic behaviour at low temperature.     

Similarity analysis of DNA sequences based on the EMD method

DNA sequences can be translated into 2D graphs and into numerical sequences; we call the numerical sequences nonlinear signal sequences. We can use the empirical mode decomposition (EMD) method to divide nonlinear signal sequences into a group of well-behaved intrinsic mode functions (IMFs) and a residue, so that we can compare the similarities among DNA sequences conveniently and intuitively. This work tests the method’s suitability by using the mitochondria of four different species.     

Mesoporous silica functionalized with an AIE luminogen for drug delivery

An aggregation-induced emission (AIE) luminogen, tetraphenylethene, has been successfully grafted onto mesoporous silica SBA-15 for the first time. The materials emit blue light upon UV irradiation, and are photostable for the ibuprofen (IBU) drug loading and release process, indicating their great potential for biomedical applications.