High-Quality Carbon Nanomaterials Synthesized by Excimer Laser Ablation

Due to their special physical and chemical properties and potential applications from hydrogen storage to medical implantation, the carbon-based nanomaterials are in the frame of attention for many research groups all over the world. As synthesis techniques, we highlight arc discharge, chemical vapor deposition (CVD) and laser ablation. Even an expensive technique, laser ablation is suitable for single-wall carbon nanotubes (SWCNTs) synthesis, providing the highest yield of over 70%, while arc discharge yield is about 30% and CVD is about 42%. The most common investigation methods for carbon nanomaterials are micro-Raman spectroscopy, thermo-gravimetric analysis (TGA) and morphological and topographic studies done by atomic force microscopy (AFM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HR-TEM). We also emphasize in this work that by involving a home-designed reactor, we successfully synthesized SWCNTs, carbon nano-onions (CNOs) as well as graphene in the same reactor. Tuning the experimental parameters, we switch the end type of nanomaterials. We have done comprehensive studies regarding the carbon nanomaterials synthesis

Embedded Implementation of a Real-Time Motion Estimation Method in Video Sequences

AbstractThis paper presents an embedded implementation of a hardware-efficient method for motion information extraction from a video signal. The high computing cost of gradient-based methods makes their implementation in compact devices for real-time applications challenging. We present our achievements in implementing a novel, simplified version of a gradient-based method, using an FPGA circuit-based system for on-line Sobel edge detection and edge displacement-based optical flow computation. The image data is acquired from a dedicated embedded camera transmitted to the reconfigurable platform. The design and implementation steps of the devised method are presented, followed by the description of the system's setup and measurement results. The yielded results are compared to similar implementations. These results lead to possibilities in using the developed system for the enhancement of indoor mobile robot localization

A Study on Tax Policy of Loan Losses in Commercial Bank in China

我国的贷款损失税收政策问题一直为人们所诟病，大部分城市商业银行和股份制商业银行都要求改革现行的不合理贷款损失税收政策；同时，我国金融业将在2007年全面对外开放，这更加剧了贷款损失税收政策改革的紧迫性。在这样的背景下，研究我国商业银行贷款损失税收政策就显得有意义和必要了。论文回顾了前人的研究成果，比较了部分国家贷款损失税收处理的具体实践，总结了现行的贷款损失税收处理方法——核销法和准备金法（包括一般准备金法和特定准备金法），分析了这两种方法对税收中性原则的遵循和悖离状况，认为，特定准备金法比核销法更符合实践需要，更能满足税收中性；在此基础上，结合我国的具体情况，从制度和实证两方面说明我国现行贷...The tax policy of loan losses has been a contentious issue in China. Most of the city banks and joint-stock commercial banks have called on reforming the actual tax policy of loan losses. In the same time, the money market of China will be open to other countries across-the-board, which aggravates the pressure of reformation of tax policy of loan losses. Under such circumstance, it seems to be sig...学位：经济学硕士院系专业：经济学院财政金融系_财政学(含税收学)学号：20034102

Krypton Gas for High Quality Single Wall Carbon Nanotubes Synthesis by KrF Excimer Laser Ablation

We report for the first time the production of single wall carbon nanotubes (SWCNTs) by KrF excimer laser ablation method under the krypton gas atmosphere. For the ablation experiment 450 mJ energy and 30 Hz repetition rate KrF excimer laser was used, and the target was prepared with the following composition: 0.6% Ni, 0.6% Co, and 98.8% C (atomic percentage). The ablation product was characterized by confocal Raman microspectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The SWCNTs obtained are a mixture of semiconducting and metallic types with narrow diameters distribution of 1.26 to 1.49 nm, are micrometers long, and contain low amount of graphite and amorphous carbon

A Molecular Pillar Approach To Grow Vertical Covalent Organic Framework Nanosheets on Graphene : Hybrid Materials for Energy Storage

Hybrid 2D–2D materials composed of perpendicularly oriented covalent organic frameworks (COFs) and graphene were prepared and tested for energy storage applications. Diboronic acid molecules covalently attached to graphene oxide (GO) were used as nucleation sites for directing vertical growth of COF-1 nanosheets (v-COF-GO). The hybrid material has a forest of COF-1 nanosheets with a thickness of 3 to 15 nm in edge-on orientation relative to GO. The reaction performed without molecular pillars resulted in uncontrollable growth of thick COF-1 platelets parallel to the surface of GO. The v-COF-GO was converted into a conductive carbon material preserving the nanostructure of precursor with ultrathin porous carbon nanosheets grafted to graphene in edge-on orientation. It was demonstrated as a high-performance electrode material for supercapacitors. The molecular pillar approach can be used for preparation of many other 2D-2D materials with control of their relative orientation

KrF excimer laser ablation in helium yields the highest amount of SWCNTs over other inert gases

Abstract: The single-wall carbon nanotubes (SWCNTs) were synthesized using the equipment, method and experimental conditions described i

VCAM-1 directed target-sensitive liposomes carrying CCR2 antagonists bind to activated endothelium and reduce adhesion and transmigration of monocytes

Chemokines are critically involved in the development of chronic inflammatory-associated diseases such as atherosclerosis. We hypothesised that targeted delivery of compounds to the surface of activated endothelial cells (EC) interferes with chemokine/receptor interaction and thereby efficiently blocks inflammation. We developed PEGylated target-sensitive liposomes (TSL) encapsulating a CCR2 antagonist (Teijin compound 1) coupled with a specific peptide recognized by endothelial VCAM-1 (Vp-TSL-Tj). TSL were characterized for size (by dynamic light scattering), the amount of peptide coupled at the surface of liposomes and Teijin release (by HPLC). We report that Vp-TSL-Tj binds specifically to activated EC in vitro and in vivo, release the entrapped Teijin and prevent the transmigration of monocytes through activated EC. This is the first evidence that nanocarriers transporting and releasing chemokine inhibitors at specific pathological sites reduce the chemokine-dependent inflammatory process