Study of stress-strain state of the roller conveyor

Numerous studies have established that the damage to the lower surface of hot-rolled strips is mainly due to their friction against rollers of mill rollers. In this case, the probability of scoring, scrapes and other mechanical damage increases otherwise severe wear on the surface of the rollers, improper installation and jamming. This also applies fully to the pulling and forming rollers of the coilers. A prerequisite for preventing damage to the surface of hotrolled strips is also the maintenance of a high level technical condition of the mill equipment, which includes inspections of wiring armature bars, roller conveyor rollers and other units for each transshipment, timely replacement and repair of individual parts and assemblies

FaaSten your decisions: A classification framework and technology review of function-as-a-Service platforms

Function-as-a-Service (FaaS) is a cloud service model enabling developers to offload event-driven executable snippets of code. The execution and management of such functions becomes a FaaS provider's responsibility, therein included their on-demand provisioning and automatic scaling. Key enablers for this cloud service model are FaaS platforms, e.g., AWS Lambda, Microsoft Azure Functions, or OpenFaaS. At the same time, the choice of the most appropriate FaaS platform for deploying and running a serverless application is not trivial, as various organizational and technical aspects have to be taken into account. In this work, we present (i) a FaaS platform classification framework derived using a multivocal review and (ii) a technology review of the ten most prominent FaaS platforms, based on the proposed classification framework. We also present a FaaS platform selection support system, called FAASTENER, which can help researchers and practitioners to choose the FaaS platform most suited for their requirements

Study of stress-strain state of the roller conveyor

Numerous studies have established that the damage to the lower surface of hot-rolled strips is mainly due to their friction against rollers of mill rollers. In this case, the probability of scoring, scrapes and other mechanical damage increases otherwise severe wear on the surface of the rollers, improper installation and jamming. This also applies fully to the pulling and forming rollers of the coilers. A prerequisite for preventing damage to the surface of hotrolled strips is also the maintenance of a high level technical condition of the mill equipment, which includes inspections of wiring armature bars, roller conveyor rollers and other units for each transshipment, timely replacement and repair of individual parts and assemblies

Retracted: Comparison Outcomes of Discover Total Disk Arthroplasty and Anterior Cervical Discectomy with Fusion in Surgical Treatment of Cervical Disk Degenerative Disease: a Meta-Analysis of Randomized Trials

RetractedThe purpose — to compare the effectiveness of Discover cervical disk arthroplasty (CDA) and anterior cervical discectomy with fusion (ACDF) in the surgical treatment of cervical intervertebral disk (IVD) degenerative disease.Study design — a meta-analysis of randomized clinical trials.Material and Methods. Randomized clinical trials were conducted in the Pubmed, EMBASE, ELibrary and Cochrane Library databases published from 2008 to October 2018, which compared the results of Discover CDA and ACDF techniques in the surgical treatment of cervical IVD degenerative disease. For dichotomous variables, the relative risk and 95% confidence interval were calculated, standardized difference of mean values and their 95% confidence interval were used for continuous variables using the random effects model.Results. This meta-analysis included 9 randomized controlled clinical trials, including the results of surgical treatment of 513 patients with degenerative disease of the cervical IVD. In the CDA group, the operation time was significantly shorter, in contrast to the group of patients who underwent ACDF (p<0.0001). The values of blood loss (p = 0.89), levels of quality of life for patients according to the Neck Disability Index (NDI) (p = 0.22), severity of pain in the cervical spine (p = 0.50) and upper limbs on a visual analogue scale (VAS) (p = 0.16), as well as the prevalence of secondary surgical procedures (p = 0.68) and adverse events (p = 0.40) between the compared groups did not have significant differences. At the same time, significantly large values of the range of motion at the operated level were noted in the CDA group (p<0.00001).Conclusion. Discover CDA in comparison with ACDF has a significantly large values of range of motion at the operated level. At the same time, there were no statistically significant differences in the NDI scores, VAS pain scores in cervical spine and upper limbs, and the prevalence of secondary surgical procedures and adverse events between the compared groups of respondents were not identified

The Impact of Smoking on Radiological Outcomes in Patients After Total Arthroplasty of the Cervical Intervertebral Discs

Objective: to investigate the impact of smoking on radiological outcomes in patients after one- and two-level total arthroplasty (ТА) of the cervical intervertebral discs.Material and methods. A single-center retrospective observational cohort study was performed. The study included 127 medical records of patients who had undergone one- or two-level TA of the cervical intervertebral discs for their degenerative disease. The medical records were divided into two groups: 32 smokers and 95 nonsmokers.Results. No statistically significant differences were found in the values of cervical lordosis and the movement amplitude of the operated segments in the postoperative period. Comparing the values of the movement amplitude of the operated segments in the group of smoking patients demonstrated significant pre- and postoperative differences in the values of the above radiological parameter (p = 0.017). Comparing the rates of loss of segmental motion of the operated segments and the incidence of heterotopic ossification did not reveal any significant differences. Analysis of Kaplan-Meier curves showed no statistically significant differences between the types of implants used in smoking patients.Conclusion. Smoking has no statistically significant impact on radiological outcomes in patients after one- or two-level ТА of the cervical intervertebral discs