[en] This academic poster is a brief introduction to the price fluctuation of the housing market of Shanghai. Shanghai, which is situated on the southeastern coast of China, is one of the most developed cities in China in terms of economy and social status and the financial center in mainland China. The soaring housing price in this city is attributed to a large extent to its enormous influence and, of course, the Matthew effect.

[en] The regulations in the area of Labor Risk Prevention stipulate that all construction companies should elaborate their Plan of Labor Risk Prevention and the minimum contents to be included in the plan.

[en] Ultrananocrystalline diamond (UNCD) films, grown using microwave plasma-enhanced chemical vapor deposition with gas mixtures of Ar--1%CH₄ or Ar--1%CH₄--5%H₂, have been examined with transmission electron microscopy (TEM). The films consist of equiaxed nanograins (2--10 nm in diameter) and elongated twinned dendritic grains. The area occupied by dendritic grains increases with the addition of H₂. High resolution electron microscopy shows no evidence of an amorphous phase at grain boundaries, which are typically one or two atomic layer thick (0.2--0.4 nm). Cross-section TEM reveals a noncolumnar structure of the films. The initial nucleation of diamond occurs directly on the Si substrate when H₂ is present in the plasma. For the case of UNCD growth from a plasma without addition of H₂, the initial nucleation occurs on an amorphous carbon layer about 10--15 nm thick directly grown on the Si substrate. This result indicates that hydrogen plays a critical role in determining the nucleation interface between the UNCD films and the Si substrate. The relation between diamond nuclei and Si is primarily random and occasionally epitaxial

[en] Ultrananocrystalline diamond (UNCD) films, grown using microwave plasma-enhanced chemical vapor deposition with gas mixtures of Ar - 1%CH₄ or Ar - 1%CH₄ - 5%H₂, have been examined with transmission electron microscopy (TEM). The films consist of equiaxed nanograins (2 - 10 nm in diameter) and elongated twinned dendritic grains. The area occupied by dendritic grains increases with the addition of H₂. High resolution electron microscopy shows no evidence of an amorphous phase at grain boundaries, which are typically one or two atomic layer thick (0.2 - 0.4 nm). Cross-section TEM reveals a noncolumnar structure of the films. The initial nucleation of diamond occurs directly on the Si substrate when H₂ is present in the plasma. For the case of UNCD growth from a plasma without addition of H₂, the initial nucleation occurs on an amorphous carbon layer about 10 - 15 nm thick directly grown on the Si substrate. This result indicates that hydrogen plays a critical role in determining the nucleation interface between the UNCD films and the Si substrate. The relation between diamond nuclei and Si is primarily random and occasionally epitaxial. [copyright] 2001 American Institute of Physics

[en] Reversible addition-fragmentation chain transfer (RAFT) polymerization mechanism was used for the preparation of molecularly imprinted polymers (MIPs) film using 4-cyano-4-[(dodecylsulfanylthiocarbonyl)sulfanyl]pentanoic acid (CDTPA) as chain transfer reagent and visible light initiator. In addition, the effect of CDTPA concentration on the polymerization rate was monitored, establishing that too high CDTPA concentration would inhibit the polymerization rate. The MIPs film was characterized by contact angle measurement, frontier transfer infrared spectroscopy (FTIR) and scanning electron microscope (SEM) which showed the successful grafting of MIPs films onto surface plasmon resonance (SPR) sensor chip. The response of progesterone sensing ranged from 10⁻¹⁶ to 10⁻⁶mol/L with low detection limit of 1× 10⁻¹⁶mol/L in PBS buffer (pH 7.4) and the MIPs film exhibited good selectivity, reproducibility and stability. Moreover, the sensors had been successfully applied to detect progesterone in tap water, lake water and human urine turning out with wide detection range and low detection limit. (paper)

[en] In this work, a hydrophilic and high sensitivity sensor was fabricated based on BMS (MAA : HEMA = 3 : 1, molar ratio) molecularly imprinted polymers (MIPs) film for 17β-estradiol (E2) detection in aqueous media combined with surface plasmon resonance (SPR) technique. In-situ UV polymerization method was used to synthesize the MIPs film on the gold surface which was modified with dodecyl mercaptan. Afterwards, the MIPs film was characterized by infrared spectroscopy (IR), scanning electron microscope (SEM) and contact angle measurements. The results showed that the MIPs film was successfully prepared on the surface of the sensor chip with good hydrophilicity and permeability. The analysis of SPR spectroscopy indicated that the MIPs film displayed greater selectivity to E2 than other competitors and non-imprinted polymers (NIPs) film and showed better adsorption performance than one kind of monomer for the same E2 concentration. The response of E2 sensor ranged from 2.5×10⁻¹⁶ to 2.5×10⁻⁸ mol/L with an ultra-low detection limit of 9.14×10⁻¹⁸mol/L in PBS buffer (pH 7.4). In addition, this sensor performed good reusability and stability. Finally, the sensor was successfully applied to detect E2 in tap water and human urine and had wide detection ranges and low detection limits in backgrounds. (paper)

[en] Several models for end-point carbon prediction of BOF(Basic Oxygen Furnace) based on off-gas analysis were studied in this paper. The advantages and disadvantages of the integral model, the exponential decay model and the cubic fitting model were analyzed respectively. Based on analysis of the characteristics of the decarburization rate curve, a new exponential model was established by the introduction of a correction algorithm. The principle of the proposed model involves applying the decarburization rate curve and the descending gradient of the historical heats to obtain the average decarburization curve and reference decarburization efficiency coefficient using the regression fitting method. According to the deviation between the actual and the predicted decarburization curves, the decarburization efficiency coefficient was corrected to improve the prediction accuracy. Plant trials were carried out in a 210 t converter to compare the performance of the mentioned models. The results showed that the new model exhibited better adaptability and higher accuracy than the other ones. The hit ratio of the new model reached more than 90% for the prediction of end-point carbon content within a tolerance of ±0.02%. (paper)

[en] Aminylferrocene(FcAI)-Nanogold(NG) modified glassy carbon electrode (FcAI/NG/GCE) was prepared by the Au-N bond between Au and FcAI. Electrochemical impedance spectroscopy (EIS) was employed to study the surface of the modified electrode. The electrochemical behavior of dopamine (DA) on the modified electrode was investigated and it was found that the modified electrode had an obvious electrocatalytic effect on DA. Compared with a bare GCE, the modified electrode exhibited an apparent shift of the oxidation peak potential in the negative potential direction and a marked enhancement in the current response for DA. We investigated the determination of DA on the modified electrode by differential pulse voltammetry (DPV). Linear calibration curve was obtained in the range of 7.0x10^-7 mol/L to 6x10^-4 mol/L of DA in 0.1mol/L phosphate buffer solution (pH= 7.0) with a correlation coefficient of 0.9989. The detection limit (S/N=3) of DA was estimated to be 1.0x10^-7 mol/L. Especially, by using the modified electrode, we can separate the oxidation peaks of ascorbic acid (AA) and DA in the PBS and it was satisfactory for the determination of DA with the interference of AA

[en] The value of the full width at half maximum of the rocking curve of symmetric 3C SiC reflection, often considered as the ''quality indicator'' of the epitaxial film, is in fact a convolution of several contributions, among which the curvature related part may play a dominant role. Thus, a precise determination of the curvature related broadening is necessary to extract the information on the film quality from the rocking curve. In this paper we demonstrate experimentally the coexistence of two independent curvature related broadening effects. We also propose an analytical model that describes quantitatively both effects.

[en] In this work we investigated the influence of the Si substrate misorientation and 3C-SiC film thickness on the density of Anti-Phase Boundaries, in order to better understand the mechanism of antiphase domain annihilation. The two highlights in our work are the utilization of [001] orientated Si on-axis wafer with spherical dimples, which gave us access to a continuum of off-cut angles (0 deg. to ∼11 deg.) and directions, and the deposition of elongated silicon islands on the surface of 3C-SiC epilayers, which improved the detection of APDs by analysis of Scanning Electron Microscopy images. We found that for a given layer thickness the relative surface occupation of one domain increases with the off-cut angle value, leading to single domain film up to a certain angle. This critical value is reduced as the film is thickened.