Search

Amorphous alloy powder can be obtained by rapid cooling atomization of certain alloy droplets. Fe-based amorphous alloy powder has been favored because of its low production cost and wide application range. Moreover, the application of Fe-based amorphous alloy powder provides a new solution for the application of bulk Fe-based amorphous alloys.The research progress of Fe-based amorphous alloy powder was reviewed, and its research status was summarized in four aspects: coating preparation, magnetic materials, laser 3D printing, and wastewater treatment. The advantages of Fe-based amorphous alloy powder in various fields were analyzed, and the research directions of Fe-based amorphous alloy powder in the fields of preparing high-quality coatings, reuse of aging magnetic powders and additive manufacturing were pointed out. Moreover, the application prospects of Fe-based amorphous alloy powder as sensing, control and other functional devices were prospected.In addition, it also shows great application potential in the fields of small size, low dimentional materials such as thin films and flexible electronics.

Objective: To evaluate the long-term effect and clinical value of endoscopic mucosal resection (EMR) with transparent cap for dysplasia and early-stage cancer of the esophagus and gastric cardia., Methods: From September 1996 to June 2007, 154 lesions in the esophagus or gastric cardia of 147 patients were treated using EMR with transparent cap. Among the lesions, there were 69 early-stage squamous-cell carcinomas in 64 patients and 47 squamous cell precancerous lesions of the esophagus in 45 patients, with an average lesion size of (14.8 +/- 6.1) mm (range, 3-40 mm), furthermore, there were 23 early-stage adenocarcinomas in 23 patients and 15 precancerous lesions in the gastric cardia in 15 patients, with an average lesion size of (8.2 +/- 4.3) mm (rang, 5-25 mm). All lesions were finally confirmed histopathologically., Results: Of the 154 lesions, 139 (90.3%) were resected completely through EMR procedure. A close relationship between the complete resection rate and the lesion size was observed. The bigger the lesion size, the lower the complete resection rate. Endoscopic follow-up was carried out in 7 patients for more than 10 years, in 43 for 5 - 10 years, in 31 for 3 - 5 years and in 66 for less than 3 years. Of 11 dead patients during following-up, 10 died of other diseases, only 1 of recurrence. The 5-year survival rate was 96.2% for early-stage esophageal cancer, and 100% for early cancer of the gastric cardia. Perioperative complications included oozing bleeding in 5 patients (3.4%) and stricture in 1 (0.7%), no perforation occurred in this series., Conclusion: Endoscopic mucosal resection is suitable to treat precancerous lesions or early-stage esophageal cancers without invasion into submucosa. Compared with conventional resection through open thoracotomy, similar long-term survival and curative effect can be achieved by this EMR treatment, preserving a good quality of life.

Objective: To investigate the clinical value of esophageal mucosal iodine stain during esophagoscopy for patients with early esophageal carcinoma or precancerous lesions without swallowing symptoms, through analyzing the correlation between endoscopic findings and pathological results of biopsy on the suspicious spots., Methods: For 366 patients examined by iodine stain during esophagoscopy, the position, size, shape and boundary of all visible unstained lesions were recorded and multiple biopsies were taken on the unstained spots., Results: Before iodine stain, 462 lesions had been discovered in 366 patients. However, 478 abnormal lesions stained in 341 patients were detected after iodine stain, the remaining 25 gave no abnormal findings. More than 1/3 of patients were found to have more than 2 abnormally stained lesions. 28.4% of them (104 cases) had moderate or severe dysplasia or early esophageal cancer. The sensitivity of iodine stain in this series was 89.8%., Conclusion: Iodine stain is very useful in detecting occult early esophageal carcinoma and precancerous lesions. The degree of coloration and the margin of suspicious spots are closely correlated with the pathological results.