Utjecaj toplinske obrade na fizička svojstva tankih slojeva antimon trisulfida

The influence of isochronal and isothermal annealing for 0 to 180 minutes and at 27 to 250°C, respectively, on the optical and electrical properties of thin films of Sb2S3 have been investigated. The films deposited on glass substrate by thermal vacuum evaporation have amorphous structure, but after annealing at temperatures above 200°C for 3 hours, they change to polycrystalline structure. The optical absorption coefficient becomes higher for subgap absorption at higher annealing temperatures. The value of the optical Tauc gap and direct band gap changed with the annealing temperature. The dark electrical resistivity showed a decrease by about an order of magnitude when increasing both the isochronal and isothermal annealing treatment.Ispitivao se je utjecaj izotermičkog toplinskog otpuštanja na optička i električna svojstva tankih slojeva Sb2S3 na temperaturama 27 do 250° C i u vremenima od 0 do 180 minuta. Tanki slojevi dobiveni vakuumskim naparavanjem na staklenu podlogu imaju amorfnu strukturu, ali nakon otpuštanja iznad 200° C kroz 3 sata oni mijenjaju strukturu u polikristaliničnu. Optički apsorpcijski koeficijent raste za podprocijepnu apsorpciju s povišenjem temperature otpuštanja. Vrijednost optičkog Taucovog procijepa i izravni procijep mijenjali su se s temperaturom otpuštanja. Tamna električna otpornost se je smanjila za red veličine kada se je povećalo vrijeme otpuštanja i temperatura

Utjecaj toplinske obrade na fizička svojstva tankih slojeva antimon trisulfida

The influence of isochronal and isothermal annealing for 0 to 180 minutes and at 27 to 250°C, respectively, on the optical and electrical properties of thin films of Sb2S3 have been investigated. The films deposited on glass substrate by thermal vacuum evaporation have amorphous structure, but after annealing at temperatures above 200°C for 3 hours, they change to polycrystalline structure. The optical absorption coefficient becomes higher for subgap absorption at higher annealing temperatures. The value of the optical Tauc gap and direct band gap changed with the annealing temperature. The dark electrical resistivity showed a decrease by about an order of magnitude when increasing both the isochronal and isothermal annealing treatment.Ispitivao se je utjecaj izotermičkog toplinskog otpuštanja na optička i električna svojstva tankih slojeva Sb2S3 na temperaturama 27 do 250° C i u vremenima od 0 do 180 minuta. Tanki slojevi dobiveni vakuumskim naparavanjem na staklenu podlogu imaju amorfnu strukturu, ali nakon otpuštanja iznad 200° C kroz 3 sata oni mijenjaju strukturu u polikristaliničnu. Optički apsorpcijski koeficijent raste za podprocijepnu apsorpciju s povišenjem temperature otpuštanja. Vrijednost optičkog Taucovog procijepa i izravni procijep mijenjali su se s temperaturom otpuštanja. Tamna električna otpornost se je smanjila za red veličine kada se je povećalo vrijeme otpuštanja i temperatura

Stoma-free survival after anastomotic leak following rectal cancer resection: worldwide cohort of 2470 patients

Background: The optimal treatment of anastomotic leak after rectal cancer resection is unclear. This worldwide cohort study aimed to provide an overview of four treatment strategies applied. Methods: Patients from 216 centres and 45 countries with anastomotic leak after rectal cancer resection between 2014 and 2018 were included. Treatment was categorized as salvage surgery, faecal diversion with passive or active (vacuum) drainage, and no primary/secondary faecal diversion. The primary outcome was 1-year stoma-free survival. In addition, passive and active drainage were compared using propensity score matching (2: 1). Results: Of 2470 evaluable patients, 388 (16.0 per cent) underwent salvage surgery, 1524 (62.0 per cent) passive drainage, 278 (11.0 per cent) active drainage, and 280 (11.0 per cent) had no faecal diversion. One-year stoma-free survival rates were 13.7, 48.3, 48.2, and 65.4 per cent respectively. Propensity score matching resulted in 556 patients with passive and 278 with active drainage. There was no statistically significant difference between these groups in 1-year stoma-free survival (OR 0.95, 95 per cent c.i. 0.66 to 1.33), with a risk difference of -1.1 (95 per cent c.i. -9.0 to 7.0) per cent. After active drainage, more patients required secondary salvage surgery (OR 2.32, 1.49 to 3.59), prolonged hospital admission (an additional 6 (95 per cent c.i. 2 to 10) days), and ICU admission (OR 1.41, 1.02 to 1.94). Mean duration of leak healing did not differ significantly (an additional 12 (-28 to 52) days). Conclusion: Primary salvage surgery or omission of faecal diversion likely correspond to the most severe and least severe leaks respectively. In patients with diverted leaks, stoma-free survival did not differ statistically between passive and active drainage, although the increased risk of secondary salvage surgery and ICU admission suggests residual confounding

Stoma-free Survival After Rectal Cancer Resection With Anastomotic Leakage: Development and Validation of a Prediction Model in a Large International Cohort.

Objective:To develop and validate a prediction model (STOMA score) for 1-year stoma-free survival in patients with rectal cancer (RC) with anastomotic leakage (AL).Background:AL after RC resection often results in a permanent stoma.Methods:This international retrospective cohort study (TENTACLE-Rectum) encompassed 216 participating centres and included patients who developed AL after RC surgery between 2014 and 2018. Clinically relevant predictors for 1-year stoma-free survival were included in uni and multivariable logistic regression models. The STOMA score was developed and internally validated in a cohort of patients operated between 2014 and 2017, with subsequent temporal validation in a 2018 cohort. The discriminative power and calibration of the models' performance were evaluated.Results:This study included 2499 patients with AL, 1954 in the development cohort and 545 in the validation cohort. Baseline characteristics were comparable. One-year stoma-free survival was 45.0% in the development cohort and 43.7% in the validation cohort. The following predictors were included in the STOMA score: sex, age, American Society of Anestesiologist classification, body mass index, clinical M-disease, neoadjuvant therapy, abdominal and transanal approach, primary defunctioning stoma, multivisceral resection, clinical setting in which AL was diagnosed, postoperative day of AL diagnosis, abdominal contamination, anastomotic defect circumference, bowel wall ischemia, anastomotic fistula, retraction, and reactivation leakage. The STOMA score showed good discrimination and calibration (c-index: 0.71, 95% CI: 0.66-0.76).Conclusions:The STOMA score consists of 18 clinically relevant factors and estimates the individual risk for 1-year stoma-free survival in patients with AL after RC surgery, which may improve patient counseling and give guidance when analyzing the efficacy of different treatment strategies in future studies