Effects of endoscopic surgery via different approaches on neurological function and complications in patients with hypertensive cerebral hemorrhage

Objective:To study the effects of different approaches of neuroendoscopic treatment on neurological function and complications of patients with hypertensive cerebral hemorrhage.Methods:72 patients with hypertensive cerebral hemorrhage diagnosed and treated in our hospital were selected as research objects.They were divided into the study group(n=37)and the control group(n=35)according to different approaches.The study group was the lateral fissure approach,and the control group was the anterior coronary suture approach.The curative effect,hematoma clearance,postoperative wake time,postoperative cerebral edema,daily living ability,neurological function,and complications in the two groups were observed.Results:The efficacy of the study group was higher than that of the control group,and the differences were statistically significant(P<0.05).The postoperative cerebral edema,postoperative wake time,and postoperative intracranial pressure in the study group were lower than those in the control group,and the hematoma clearance rate in the study group was higher than that in the control group,the differences were statistically significant(P<0.05);At 3 and 6 months after treatment,the daily living ability of the study group was higher than that of the control group,and neurological dysfunction of the study group was lower than that of the control group(P<0.05);The complication rate of the study group was lower than that of the control group(P<0.05);There was no significant difference in mortality rate between the two groups(P>0.05).Conclusion:Different approaches have different effects on patients with hypertensive intracerebral hemorrhage.Compared with the anterior coronary suture approach,the lateral fissure approach has less damage to nerve function,and has less postoperative complications.

Reduction of Oxide Scale with Hydrogen

During hot rolling process metals will inevitably oxidize because of high temperature and air condition. In order to guarantee the surface quality, acid pickling is applied to remove the oxide scale while waste acid will do harm to the environment. Faced with the problem, by means of reduction process of hot-rolled plates, the oxide scale will be reduced to iron, so that acid pickling is unnecessary. One pass cold rolling procedure was applied. The compres- sion ratios of hot-rolled plates with oxide scale were 10%, 18%, 26% and 31%, respectively. After that, samples mentioned above including a sample without deformation were separately reduced under hydrogen atmosphere condi- tion （5 % H2 ＋95 % Ar in volume percent） at 600-1 000 ℃. The thermal gravimetric apparatus （TGA） was used to establish accurate experimental condition and obtain complete mass loss data. Field emission electron probe microa- nalysis （EPMA） was applied to analyze scale morphology change and composition distribution through the oxide scale. It was found that the sample with 26% compression ratio could be reduced completely at 900 ℃which was favorable to galvanization.

Effect of Si Content and Temperature on Oxidation Resistance of Fe-Si Alloys

Hot-rolled Fe-（0.75-2.20）Si （mass%） alloys were oxidized in dry air at 600-1200 ℃. The oxidation process was carried out by thermal gravimetric analysis （TGA）. At 600- 1 150 ℃, oxidation gain curves were approximately parabolic. Electron probe mieroanalysis （EPMA） was applied to investigate cross-section morphology of oxide layer and element distribution across the layer. At lower temperature of 700 ℃, the oxide layer consisted of internal oxidation zone （IOZ）, inner Si-rich layer （conglomerate of fayalite and magnetite） and outer hematite layer, while at higher temperature of 1200 ℃, fayalite and wustite were observed in external oxide scale. Liquidus temperature of fayalite was detected by differential scanning calorimetry （DSC）. Through comparing the oxidation mass gain and parabolic rate constant of the alloys, it was found that oxidation resistance of Fe-Si alloy was enhanced by increasing Si content below 1 150 ℃ while increasing Si content of the alloy resulted in higher oxidation rate above 1150 ℃ owing to the liquid fayalite formation.

Morphology of Oxide Scale and Oxidation Kinetics of Low Carbon Steel

The oxidation kinetics and composition of oxide scales on low carbon steel （SPHC） were studied during i- sothermal oxidation. Thermogravimetric analyzer （TGA） was used to simulate isothermal oxidation process of SPHC for 240 min under air condition, and the temperature range was from 500 to 900 ℃. Scanning electron microscope （SEM） was used to observe cross-sectional scale morphology and analyze composition distribution of oxide scales. The morphology of oxide scale was classical three-layer structure. Fe2 03 developed as whiskers at the outermost lay- er, and interlayer was perforated-plate Fe3 04 while innermost layer was pyramidal FeO. From the oxidation curves, the oxidation mass gain per unit area with time was of parabolic relation and oxidation rate slowed down. On the ba- sis of experimental data, the isothermal oxidation kinetics model was derived and oxidation activation energy of SPHC steel was 127. 416 kJ/mol calculated from kinetics data.

Hot-dip Galvanizing of Carbon Steel after Cold Rolling with Oxide Scale and Hydrogen Descaling

A new processing method for producing hot dip galvanized steel is designed and tested, in which pickling is skipped. Hot-rolled low carbon steel sheets are roiled with oxide scale in an experimental mill at room temperature, prior to annealing under a 20% hydrogen reducing atmosphere and galvanizing on a hot-dip galvanizing simulator. Micro-cracks formed in the oxide scale during cold rolling roughen the steel surface and enlarge the specific surface. Through-thickness cracks provide transport channels for hydrogen, and hence the reduction of oxide scale is en- hanced. When the sheet is dipped in the zinc bath, cracks are submerged by liquated zinc and the defects are not dis- tinct after hot-dip galvanizing. The overlay coating occludes with rough surface of the sheet, whereby a superior coat- ing adherence is realized.