ABSTRACT Full‐ceramic bearings possess numerous exceptional attributes, such as enhanced rigidity and superior resistance to wear. Nevertheless, full‐ceramic consistently encounter elevated temperatures for extended periods of high‐speed operation, which easily affect the processing performance equipment. Lubrication viscosity has a significant effect on bearing heat generation, so it is meaningful approach lubrication with respect dynamics bearings. angular contact ball are treated research...

Modal frequencies are widely used to capture dynamics and reveal possible failures of bridge structures. However, the non-Gaussianity nonlinearity nonstationary modal associated with actual structure under changing environmental conditions often restrict application in structural health monitoring. Therefore, a new localized frequency cointegration without measurements for elimination interference damage warning is proposed this paper. The k-nearest neighbor rule first employed search...

Abstract Background The high degree of intratumoral genomic heterogeneity is a major obstacle for glioblastoma (GBM) tumors, one the most lethal human malignancies, and thought to influence conventional therapeutic outcomes negatively. proneural-to-mesenchymal transition (PMT) glioma stem cells (GSCs) confers resistance radiation therapy in patients. POLD4 associated with cancer progression, while mechanisms underlying PMT tumor have remained elusive. Method Expression prognosis POLD family...

Abstract In order to reveal the friction properties and improve wear resistance of silicon nitride ceramic materials, a calculation model static coefficient is established. The influence law contact surface roughness on under different load speed analyzed. test results verification are carried out by using Friction Wear Testing Machine. Then dry process simulated based UDEC, failure form ceramics, directly proportional roughness, inversely load, speed. There critical value for sub-contact...

The removal mechanism of silicon nitride ceramic under high-speed grinding is studied in this article, and parameters are optimized. efficiency improved. diamond grains wheel simplified into the truncated octahedron cone to simulate process. When workpiece grinded by single-diamond grain continuously multi-diamond grains, effects depth speed on force surface morphology analyzed. Through experiment inner ceramic, data images were obtained. It proves that at process studying effect machining...

Osteosarcoma often occurs in children and adolescents affects their health. The survival rate of osteosarcoma patients is unsatisfactory due to the lack early detection metastasis development drug resistance. Hence, dissection molecular insight into initiation progression pivotal provide new therapeutic strategy. In recent years, long noncoding RNAs (lncRNAs) have burst stage malignant behaviors. LncRNA SCAMP1 has been discovered play an essential role carcinogenesis progression. However,...

To investigate the safety and efficacy of piezosurgery in anterior cervical discectomy fusion (ACDF) for spondylotic myelopathy (CSM).

We simulated the process of grinding glass-ceramics with finite element simulation method. During simulation, we considered impact changes in various parameters on and analysis results residual stress at last. The target this research is to provide some basic reference for choice parameters.

Glioblastoma has high recurrence, while the sensitivity of recurrent glioblastoma to chemotherapy is lower than that primary glioblastoma. Moreover, there no standardized treatment for Unfortunately, biological mechanism still unclear, and are few related studies. We compared phenotypes clinical specimens, in-vitro cultured glioma stem-like cells (GSCs) patient-derived xenograft tumor (PDX) models explore molecular genetic characteristics from same patient. In vitro , SU5-2, GSCs derived had...

The load capacity and lubrication performance of the slewing bearing are fairly sensitive to edge effects at both ends main thrust rollers. Therefore, quantitative investigations effect is practically important. In this study, an elastic fluid model that considered external internal structural parameters established. A modification function rollers included in a finite long-line contact perform dynamic analysis. simulated oil film’s thickness pressure distributions compared under different...

Due to the self-lubrication and high stiffness, ceramic bearings are widely applied in mechanical system. However, under some complex working conditions, happening of defection uncertain lubrication on ball's surface is complex. Insufficient oil may increase friction shorten defect bearing's life. In paper, characteristic defect-ball bearing considered investigate performance. Firstly, a novel model established through Hamrock-Dowson theory. Then, Newton–Raphson method employed analyze...

Local causal discovery aims to learn and distinguish the direct causes effects of a target variable from observed data. Existing constraint-based local methods use AND or OR rules in constructing skeleton, but using either rule alone is prone produce cascading errors learned thus impacting inference relationships. On other hand, directly applying score-based global may randomly return incorrect results due existence equivalence classes. To address above issues, we propose Hybrid Causal...

Different grinding parameters of silicon nitride ceramic are researched at the process internal grinding. The influences on roughness surface by linear speed wheel ( v s ), radial feeding f ) and axial vibration a studied in uniformity testing. experimental equation is optimized. machined morphologies specimen measured instrument Taylor-Hobson Surtroni-25 scanning electron microscope S-4800. results show that with increasing get reduced, raised. It also inversely proportional to speed. has...

Mechanism and functions of S-4800 Scanning Electron Microscope are introduced in this paper. The image-forming mechanism structure SEM studied, the signal transformation secondary electron backscattered is presented. main application fields researched.

To analyze the differences in distribution of lymphocytes (PBLS) different subgroups osteosarcoma (OS) and predictive value related parameters on survival prognosis OS.For retrospective analysis, 80 patients with malignant OS diagnosed treated our hospital from June 2016 to 2017 were selected as observation group, benign bone tumors during same period control group. Patients group followed up for three years grouped according tumor diameter, stage, metastasis, prognosis. Fasting venous blood...

Severe pneumonia is a common infectious disease with high morbidity and mortality. Early etiological diagnosis crucial for improving the prognosis. The aim of this study to evaluate clinical value sampling time mNGS in patients severe pneumonia.This retrospective enrolled 105 pneumonia. was performed on bronchoalveolar lavage fluid (BALF). Patients were divided into ≤ 72h vs >72h groups survivors non-survivors according their Clinical characteristics, adjustment antibiotics prognostic...

Objective To investigate the effect of CareDose 4D combined with Care kV on CT pulmonary ground glass nodule (GGN) respect to quality and radiation dose. Methods The thoracic model containing 6 GGN was performed by using 7 low-dose schemes. The + adopted in scheme 1. In schemes 2, 3 4, tube voltage 120 kV, current 30, 20 10 mAs respectively. 5, 7, 100 mAs, image [CT value, contrast noise ratio (CNR), value (SD) subjective score] effective dose (E) were compared. Results There no...

Abstract The initial positioning of concrete distributor in the area is primary issue that restricts realization automatic distribution, automation production precast components. Therefore, pre-calibration method based on laser sensor proposed. realizes locating moving by adding encoders driving motors distribution-big-cart and distribution-small-cart. side-mold bottom-mold-tray could be positioned through a combining information. Pre-calibration point determined synthesizing information...

Abstract Objective To investigate the safety and efficacy of piezosurgery in anterior cervical discectomy fusion (ACDF) for treating patients with spondylotic myelopathy (CSM) coincident retrovertebral body osteophytes adjacent to endplate or a free nucleus pulposus migrated vertebral body, posteriorly; known as complex (cCSM) here. Methods Forty-seven cCSM underwent ACDF surgery from 2014 2017. Among these patients, 26 using (group A) 21 by traditional tools such air drill, bone curet...

Objective To explore the application value of automatic tube current modulation combined with iterative reconstruction algorithm (idose4) in low-dose computed tomography pulmonary angiography (CTPA). Methods A total 80 patients CTPA collected continuously were randomly divided into control group (n=40, kV, 180 mAs) and experimental modulation). The data sets reconstructed filtered-back-projection (group A), B) C). Subjective score, mean CT values artery, image noise, signal-to-noise...

Objective To discuss the effect and postoperative complications of gastroesophageal reflux disease with hiatus hernia after fundoplication treatment laparoscopic Nissen Toupet. Methods Review 57patients esophageal hiatal complicated which be treated Toupet from July 2014 to 2016 in Shengjing Hospital affiliated China Medical University, 24 patients underwent surgery(group Nissen), 33 operation(group Toupet). Observed compare anti two groups. Results 57 cases were successfully...