The large attachment energy (AE) of (1 0 0) and (1 −1 0) explains their vanishment. Stronger interaction with n -butanol of (0 −2 0) leads to its larger facet area than (0 2 0). The larger AE of (1 1 0) than (0 0 1) explains its faster growth rate.
The viewpoint that opposed the propertilization of personal information will lead people to neglect the important function of its market circulation.In fact,rational circulation of personal information can not only advance the commercial efficiency and reduce trespass by irrelevant information,but also promote international trades.As for the limitation of the propertilization of personal information,it can be conquered by rational legal institutions and reasonable market rule.
In this issue,we investigated the human issues that were brought about by the medical high original techniques which has also brought great advantages in neurosurgery.We suggest that a good neurosurgery should establish good doctor-patient relationships,rationally use the medical resources and show good performance of medical ethics when using medical high-tech for diagnosis and treatment of diseases.
Objective: To evaluate the effects and indications of two kind of balloon cahteters (Polythene and Inoue) in percutaneous transluminal angioplasty (PTA) for treatment of Budd-Chiari syndrome,Methods: A total of 52 patients with pasthepatic inferior vena cave (IVC) obstruction syndrome were treated by PTA with Polythene. Inoue balloon catheters respectively. Stent was inserted in 12 cases. IVC pressure and right atrial pressure were measured, and pressure gradients were calculated before and after PTA. Results: The diameter of TVC was increased from 1. 9±0. 4 mm to 19. 5 ±6. 5 mm after PTA. The residual pressure gradient after PTA was 0. 77±0. 32 kPa in Polythene 18 mm group. 0. 62±0. 53 kPa in 20 mm Polythene group, 0. 34±0. 27 kPa in Inoue 24 mm group and 0. 32 ±0. 28 kPa in Inoue 26 mm group respectively. Conclusion: PTA (or companied by stent) is an effective treatment for poslhepatic inferior vena cava obstruction. Large balloon selection and effective dilation are key factors for the effect improvement and rcstenosis prevention.
Abstract The Marine environment is a very complex and corrosive environment. Marine corrosion environment can be generally divided into Marine atmospheric environment and seawater environment. Because the seawater is rich in a variety of free ions mixed with corrosive media, the main component is sodium chloride, in addition to containing magnesium, potassium, iodine, bromine, and other elements of salt, which has strong corrosion to metal materials, if serious, it will cause safety accidents. Therefore, ensuring the effectiveness of the anticorrosion system is very important for the safe and reliable operation of the offshore platform. pulse plating is used and the metal nickel coating and metal nickel-chromium coating are prepared to analyze the microstructure and corrosion resistance of each film layer. From the macroscopic, it can be found that three coatings have more or less corrosion phenomenon, there is obviously no nickel-chromium and nickel layer on the surface of nickel-chromium corrosion defects, and through scanning electron microscopic observation, microscopic level nickel chromium corrosion after corrosion phenomenon is the least of three layers, which suggests that nickel chromium seawater corrosion resistance is strong. The three layers are then electrochemical corroded to study the corrosion resistance of the three layers. The results show that the corrosion resistance of the nickel-plated layer, nickel-chromium coating, and nickel-iron chromium coating prepared in the copper substrate is improved successively, which shows the influence of different membrane elements on the corrosion resistance of copper substrate against seawater medium. Although the composition parameters of the various membrane layers vary, they experience the same corrosion mechanism-pitting; Nickel chromium and chromium, iron and other atoms are present in the nickel matrix in the form of solid solution and finally form the solid solution alloy coating. For nickel-chromium coating, the content of iron and chromium in the surface layer has a certain influence on the corrosion resistance of the metal coating. The electrochemical parameters of nickel plating are studied separately, and the comparison with the nickel-chromium alloy coating and the coating is conducted. The equivalent circuit is fitted and determines the largest impedance value and the largest phase Angle among the three membrane layers, which finally has the strongest seawater corrosion resistance.
As a most common algal toxin in eutrophic freshwater body, microcystins can be produced by the bloom-forming Cyanophyta microcystis, it has become a potential hazardous substance in aquatic environments for its toxic, distribution and stability. With the increasing recognition of microcystins, China had added microcystin-LR into the related water quality standards. It is very important to detect and control the microcystins in the aquatic environment. This paper systematically introduced the current situation of researches about the determination and pollution control technique of microcystins in drinking water at home and abroad in resent years and then some issues worth of paying more attention to and doing further study in pollution control in future were presented.
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