bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analytical characteristics of the electron beam distribution density over the heated spot for optimizing the electron-beam welding process
Authors: Kurashkin S O , Laptenok V D , Murygin A V , Seregin Yu N 
Published: November 2019

Abstract
The control of the electron beam energy distribution density over the heated spot, realized by using different scanning trajectories, can significantly improve the quality of welded joints. Experimental research by the authors showed that the best quality of welded joints is provided by scanning the electron beam in the form of a raster. Therefore, to optimize the process of electron-beam welding, trajectories of the classical raster, sinusoidal raster and truncated raster were proposed, and by increasing the scanning amplitude along the joint, the vapour-gas channel of penetration transforms into a stable cavity, on the front wall of which the metal melts, with it then being transferred along the side walls to the tail end of the weld pool. It is advisable to investigate the effect of the formation of the penetration cavity in the EBW of various materials and different thicknesses. For this, an apparatus must be created that implements scanning in the form of various rasters. For optimizing the process of electron-beam welding, the trajectories of the classic sawtooth raster, sinusoidal raster and truncated raster are proposed. For these scanning trajectories, analytical expressions and calculated characteristics of the electron beam energy distribution density are obtained over the heated spot. The trajectory in the form of a sinusoid and a truncated raster makes it possible to obtain double-humped energy distribution over the heated spot. The obtained characteristics facilitate the optimization process of electron-beam welding of different materials.
Laser welding of aluminium alloys for the aircraft industry
Authors: Malikov A , Orishich A , Karpov E , Vitoshkin I 
Published: November 2019

Abstract
The results of laser welding of an Al-Mg-Mn and two Al-Mg-Li alloys with different lithium contents which used in the aircraft industry are presented in this paper. Microstructure, phase composition and mechanical properties of the welds were investigated. A fundamental difference in the processes of formation of structural-phase compositions in the weld metal of these alloys was found.
Analysis and simulation of kinetics of elasto-plastic weld failure in structures at cryogenic temperatures
Authors: Makhutov N A , Makarenko I V , Makarenko L V 
Published: November 2019

Abstract
The article presents the results of solving one of the fundamental problems in the field of increasing strength, service life, survivability, reliability and safety of welded joints in critical structures. A model for simulation of elasto-plastic welds failure in steel structures at cryogenic temperatures was developed. It proposed clarifying calculation and experimental methods for analysis and simulation of failure mechanisms taking into account types of forming defects. In addition, effect of heating and cooling cycles, kinetics of elasto-plastic deformation as well as fields of residual stresses and strains were used to predict the results.
Laser welding of thin metal filaments from titanium nickelide
Authors: Potekaev A I , Gunter S V , Ibragimov E A , Klopotov A A , Galsanov S V 
Published: November 2019

Abstract
The paper presents the results of a study of welded joints of thin filaments from the TiNi(MoFe) alloy. Welding was carried out in order to produce compounds from thin filaments used in medicine as a suture material and for manufacture of metal fabrics. The experiments have shown the perspectivity of using pulsed laser welding for producing welded joints of thin filaments. Formation features of the welding pool as a result of the interaction of a laser beam with a composite material, which are thin filaments from the TiNi (MoFe) alloy, have been revealed using scanning electron microscopy.
EBSD analysis of the structure of a weld joining a chromium-nickel steel sheet and a titanium alloy sheet through a copper insert
Authors: Pugacheva N B , Michurov N S , Senaeva E I 
Published: November 2019

Abstract
The structure of the different zones of a C02 laser welded joint between a chromium-nickel steel sheet and a titanium alloy sheet, with a copper insert between them, is studied by EBSD analysis. The phase compositions of all the zones have been determined. The weld material has been found to consist of a Cu-based solid solution and unevenly distributed intermetallic particles of different stoichiometric compositions. The heat-affected zones consist of supersaturated iron- and titanium-based solid solutions. After laser welding, the microdeformations of the phase lattices are distributed unevenly over the cross section of the welded joint; namely, the maximum microdeformations and the resulting microstresses are concentrated in the heat-affected zone at the boundary between the weld and the titanium alloy.
Experiments on the effect of thermoelectric current magnetic field on welding of 60-mm thick dissimilar steels
Authors: Sliva A P , Goncharov A L , Terentyev E V , Kharitonov I A , Dragunov V K 
Published: November 2019

Abstract
The work describes a method for measuring the magnetic field induced by thermoelectric currents in control points above welded specimens and presents the measurement results. The dissimilar 60-mm thick steel samples are welded by electron-beam welding (EBW). The grades of the pairs of steels are 09Mn2Si + 12Cr18Ni10Ti, 09Mn2Si + 20Cr13 and 20Cr13 + 12Cr18Ni10Ti. The study shows that the electron beam in the weld root deflects towards the material with larger positive potential of integral thermal EMF. The deflection is uneven along the specimens, which necessitates taking into account the geometry of welding joints when elaborating the mathematical models of the process. Maximum deflection for the studied pairs of materials correspondingly amounts to 0.6, 2,8 and 3.8 mm, which is critical for producing a high-quality seam. In addition, the alteration of magnetic induction in control points during EBW was obtained.
Modeling heat input when friction stir welding
Authors: Statsenko V , Sukhorada A , Lelyukhin V 
Published: November 2019

Abstract
An important element of friction stir welding technology is the determination of the temperature of the material in the mixing zone, which can be determined by calculating the amount of heat introduced into the welding zone. To determine this value, experimental studies were carried out on a stand in which the material to be welded (aluminum alloy AMg5) is modeled as an experimental tube with a diameter of 20 mm, and the tool (from tool steel P6M5) is modeled as a working plate. On the stand, studies of the dependence of the frictional moment and heat-liberation value were performed. According to the obtained experimental data, the heat-liberation dissipation and heat power on the working tool are calculated, the dependences of these values on the radius of the working tool are obtained.
To increase the amount of heat input in the center of the contact area, a tool with a drive with two concentrically located (one inside the other) shafts is proposed, while the inner shaft rotates at a higher speed than the outer one. According to the obtained experimental data, the dependences of heat release for each shaft and the total heat release for a tool with two shafts at an external shaft rotation speed ω = 63 s-1 and different rotation speeds of the internal shaft are calculated. In total, for the external and internal shafts, the total heat release value is about 2 times higher than the total heat release value using a single shaft.
The purpose of this work is to find the values of heat release in friction stir spot welding, as well as the development of friction spot welding tools with higher heat release.
Post-treatment of arc-welded aluminum alloy joints by laser shock peening
Authors: Tareva A A , Melnikov D M , Melnikova M A 
Published: November 2019

Abstract
The possibility to improve aluminum alloy welded joints with laser shock penning was demonstrated. It was shown that microhardness of peened area in heat affected zone is higher than one without post-treatment. Also in this area the residual tensile stresses turns into residual compressive stresses. Laser peening process is proposed to carry out using low-energy lasers. In this case were analysed different types of ablative overlays.
Influence of spin creepage on contact patch
Authors: Tudorache M C , Oprea R A , Neagoe I 
Published: November 2019

Abstract
The wheel-rail contact patch analysis methods are related to the evolution of modern computers. Contemporary computation systems allow the approach of tri-dimensional methods which take into account various contact parameters. With this background in mind, the wheel-rail contact problem is a study under development. The paper proposes a tri-dimensional approach, considering the spin creepage parameters. The spin effect is due to the increase of the wear around the wheel flange and the gage face. At the same time, the spin is influenced by the wheel rolling operating conditions. The paper gives an insight of wear mechanisms analysis, plastic deformation and fatigue phenomenon of the contact patch constituent material.
The influence of additive manufacturing parameters on the structural and mechanical properties of acrylonitrile butadiene styrene (ABS) parts produced by fused filament fabrication
Authors: Cristea D , Pop M A , Faraian C , Munteanu D 
Published: November 2019

Abstract
The key to the operation of additive manufacturing is that the parts are made by adding the material layer by layer. Each layer is a thin cross section of the part derived from the original CAD data. Each layer must have a finite thickness and thus the resulting part will be an approximation of the original data. The thinner each layer, the more the resulting piece will be more like the designed part. All additive manufacturing techniques marketed so far use a layered approach. However, certain drawbacks were reported for this type of manufacturing, all depending on certain process parameters. One of the most important build parameters, in terms of cost and final properties, is the build construction angle. The influence of the build positioning (i.e. angle of the layers) in respect to the building plate, during fused filament fabrication of acrylonitrile butadiene styrene (ABS) parts was studied. The characteristics of interest were: the structural features of the manufactured part and the mechanical properties obtained after tensile, compression, and hardness tests, all as function of the build orientation, while keeping the remaining manufacturing parameters identical. It was observed that the build orientation has a significant influence on the properties.
Lean Business Practice as Support to QMS Implementation in According to ISO 9001:2015
Authors: Djapic M , Popovic P , Lukic L 
Published: November 2019

Abstract
The contemporary market conditions impose increasingly strict requirements on organizations. Orientation towards product quality is one of the optimum strategies enabling survival and development in the ever more globalized market. The business practice required by ISO 9001 standard is often insufficient for an organization to survive in the market. Therefore many organizations, in addition to developing and implementing Quality Management System (QMS), optimize their operative processes by implementing the Lean tools. The paper provides a concept of interconnecting the ISO 9001:2015 standard requirements with the possible Lean tools deployment, which is to contribute to promoting effectiveness of the implemented QMS.
Indoor path planning and obstacle avoidance simulation
Authors: Savu T , Jugravu B A 
Published: November 2019

Abstract
The paper is describing the work performed for choosing and designing a path planning and obstacle avoidance solution for a car-like vehicle moving in an indoor environment. The proposed algorithm first consists in providing the vehicle with a set of passing points generated by a Dijkstra path planning algorithm. The vehicle is using the points for establishing its path and is avoiding the obstacles using scanned data from a distance sensor. In a simulation environment, initial tests were performed for estimating correct values of the vehicle’s forward and angular velocities and for estimating the effect of the scanning speed on the vehicle’s behaviour. Obstacle avoidance tests were performed for identifying specific situations possible to appear due to high velocities or to low scanning speed. Even not always choosing a smooth avoidance path, the algorithm proved to find a way for avoiding the obstacle in a clear and fast enough manner.
Optimization of Heated Structures for Several Load Cases
Authors: Kretov Anatolii 
Published: November 2019

Abstract
Optimization methods providing maximum strength and rigidity of the thin-walled structure are considered. A critical overview of the works related to the optimization including the heated design is done. To optimize for several cases of loading, a minimization of functional is applied, which is the sum of the total potential strain energies for each case of loading. The optimization process begins with the initial basic structure, which includes all possible variants of the location of the power elements. In the optimization process, inefficient elements are eliminated by minimizing their rigidity. Numerical optimization studies on the example of truss construction are carried out.
Research on Method of Phantom Track Generation Based on Cooperative Control of UAVs in Uniform Linear Motion
Authors: Ouyang Zhiping , Xu Chen , Feng Jiqiang , Wang Bo 
Published: November 2019

Abstract
In order to effectively interfere with the networking radar, this paper establishes a reverse-pyramid model firstly based on the uniform linear motion of UAVs and the characteristic of phantom track. Furthermore, the multi-UAV cooperative track deception model is built to analyze the locations and motions of UAVs. Finally, we design a simulation experiment to obtain the motion parameters of each UAV and analyze the minimum number and speed of UAVs.
A Centralized Scheduling Algorithm in On-Board Hybrid Optical/Electric Switching
Authors: Zhang Yi , Li Jun , Zhou Quan , Li Jingling , Liang Wei , Cui Tao 
Published: November 2019

Abstract
To realize the interconnection of heterogeneous links, it’s necessary to develop the on-board hybrid optical/electric switching technology. Because of the separate scheduling strategy in on-board hybrid switch, there is conflict among different ports, and the cell loss rate is greatly reduced. In order to solve this problem, a centralized scheduling algorithm in on-board hybrid optical/electric switching is proposed. According to the parameters and characters of optical data and electric data, the proposed algorithm with the group performance idea can schedule the multi-granularity traffic by analysing the resource utilization of hybrid switch fabric, which has the principle of the highest throughput. This algorithm can increase the matching probability between input and output ports, reduce the inner congestion probability of hybrid optical/electric switch module, and improve the performance of this switch fabric. The analysis and simulation results show that the proposed algorithm has fewer parameters and simple implementation steps, which can effectively avoid congestion, and has the better performance than others in cell loss rate.
Expression and Prognostic Value of IFIT1 and IFITM3 in Head and Neck Squamous Cell Carcinoma
Authors: Li Hao , Yang Lei-Lei , Wu Cong-Cong , Xiao Yao , Mao Liang , Chen Lei , Zhang Wen-Feng , Sun Zhi-Jun 
Published: November 2019

AbstractObjectivesInterferon-induced protein with tetratricopeptide repeats 1 (IFIT1) and interferon-induced transmembrane protein 3 (IFITM3) are commonly induced by type I interferon. The study aims to investigate the expression and clinical significance of IFIT1 and IFITM3 in head and neck squamous cell carcinoma (HNSCC).MethodsImmunohistochemistry was applied on tissue microarray to reveal IFIT1 and IFITM3 expression in 275 HNSCC, 69 dysplasia, and 42 normal mucosa samples. The clinicopathologic features associated with IFIT1 and IFITM3 expression in HNSCC patients were analyzed.ResultsIFIT1 and IFITM3 were highly expressed in HNSCC tissues. High expression of IFIT1 and IFITM3 predicts a negative prognosis for patients (P &lt; .01). IFIT1 and IFITM3 expression was associated with programmed cell death ligand 1, B7-H4, V-domain Ig suppressor of T-cell activation, indoleamine 2,3-dioxygenase, and macrophage marker immunoreactivity.ConclusionsIFIT1 and IFITM3 were overexpressed in HNSCC and indicated poor prognoses for patients with HNSCC. IFIT1 and IFITM3 expression was correlated with several immune checkpoint molecules and tumor-associated macrophage markers.
Allogeneic HSCT for adult-onset leukoencephalopathy with spheroids and pigmented glia
Authors: Gelfand Jeffrey M , Greenfield Ariele L , Barkovich Matthew , Mendelsohn Bryce A , Van Haren Keith , Hess Christopher P , Mannis Gabriel N 
Published: November 2019

Abstract
Adult-onset leukoencephalopathy with spheroids and pigmented glia (ALSP) is an autosomal dominant leukoencephalopathy caused by mutations in colony stimulating factor 1 receptor (CSF1R). Here we report clinical and imaging outcomes following allogeneic haematopoietic stem cell transplantation (HSCT) in two patients with ALSP at the University of California, San Francisco between January 2016 and December 2017. Patient 1 proceeded to transplantation at age 53 with a haplo-identical sibling donor. Patient 2, whose sister and mother had died of the disease, proceeded to transplantation at age 49 with a 12/12 human leukocyte antigen-matched unrelated donor. Both patients received reduced intensity conditioning regimens. At 28 and 26 months post-HSCT, respectively, both patients were alive, without evidence of graft-versus-host disease, with major infection at 1 year in one and new-onset seizures in the other. In both cases, neurological worsening continued post-HSCT; however, the progression in cognitive deficits, overall functional status and gait impairment gradually stabilized. There was continued progression of parkinsonism in both patients. On brain MRI, within 1 year there was stabilization of T2/FLAIR abnormalities, and after 2 years there was complete resolution of abnormal multifocal reduced diffusion. In summary, after &gt;2 years of follow-up, allogeneic HSCT in ALSP led to interval resolution of diffusion MRI abnormalities, stabilization of T2/FLAIR MRI abnormalities, and partial clinical stabilization, supportive of treatment response. Allogeneic HSCT may be beneficial in ALSP by providing a supply of bone marrow-derived brain-engrafting myeloid cells with donor wild-type CSF1R to repopulate the microglial niche.
Cat Scratch Disease Presenting as Fever of Unknown Origin Is a Unique Clinical Syndrome
Authors: Landes Michal , Maor Yasmin , Mercer Diego , Habot-Wilner Zohar , Bilavsky Efraim , Chazan Bibiana , Cohen Regev , Glikman Daniel , Strahilevitz Jacob , Katzir Michal , Litachevsky Vladislav , Melamed Rimma , Guri Alex , Shaked Hila , Perets Odelya , Wiener-Well Yonit , Stren Anat , Paul Michal , Zimhony Oren , Srugo Isaac , Rahav Galia , Bishara Jihad , Kuperman Amir A , Ben-Ami Ronen , Ephros Moshe , Giladi Michael 
Published: November 2019

AbstractBackgroundFever of unknown origin (FUO) is a rare manifestation of cat scratch disease (CSD). Data regarding CSD-associated FUO (CSD-FUO), particularly in adults, are limited. We aimed to study disease manifestations and long-term clinical outcome.MethodsA national CSD surveillance study has been conducted in Israel since 1991. Data are obtained using questionnaires, review of medical records, and telephone interviews. FUO was defined as fever of ≥14 days without an identifiable cause. CSD-FUO patients were identified in the 2004–2017 CSD national registry. Follow-up included outpatient clinic visits and telephone/e-mail surveys.ResultsThe study included 66 CSD-FUO patients. Median age was 35.5 years (range, 3–88). Median fever duration was 4 weeks (range, 2–9). Relapsing fever pattern was reported in 52% of patients, weight loss in 57%, and night sweats in 48%. Involvement of ≥1 organs occurred in 59% of patients; hepatosplenic space-occupying lesions (35%), abdominal/mediastinal lymphadenopathy (20%), ocular disease (18%), and multifocal osteomyelitis (6%) were the most common. Malignancy, particularly lymphoma, was the initial radiological interpretation in 21% of patients; 32% underwent invasive diagnostic procedures. Of the 59 patients available for follow-up (median duration, 31 weeks; range, 4–445), 95% had complete recovery; 3 patients remained with ocular sequelae.ConclusionThis is the first attempt to characterize CSD-FUO as a unique syndrome that may be severe and debilitating and often mimics malignancy. Relapsing fever is a common clinical phenotype. Multiorgan involvement is common. Recovery was complete in all patients except in those with ocular disease.
O19 OUTCOMES OF IVOR LEWIS VERSUS MCKEOWN OESOPHAGECTOMY FOR CANCER: A PROPENSITY SCORE MATCHED ANALYSIS OF THE NETHERLANDS CANCER REGISTRY
Authors: Luijten J C H B M , Verstegen M , Nieuwenhuijzen G A P , van Berge Henegouwen M I , Gisbertz S S , Wijnhoven B P L , Verhoeven R H A , Rosman C 
Published: November 2019

Abstract

Aim
The aim this study was to investigate possible differences in outcomes between Ivor-Lewis (IL) versus McKeown esophagectomy (MK) in a population based cohort.

Background
It is unknown whether IL or MK should be preferred in patients with potentially curable locoregionally oesophageal or gastro-oesophageal junction (GEJ) cancer.

Methods
Oesophageal and GEJ cancer patients without distant metastases who underwent a transthoracic oesophagectomy between 2015 and 2017 were selected from the Netherlands Cancer Registry. Patient and tumour characteristics, and treatment outcomes were analysed and compared between IL and MK after propensity score matching (PSM). Patients were matched based on sex, age, tumour morphology and topography, comorbidities, neoadjuvant treatment, cT and cN stage, ASA-score and hospital volume. Postoperative complications and survival were compared between both groups using Chi-Square and multivariable Cox regression analyses. In the multivariable Cox regression analyses we corrected for infectious complications (wound complications and pneumonia) and anastomotic leakage to investigate its effect on survival.

Results
Off all 1764 included patients (1201 IL patients and 563 MK patients), 948 patients remained after matching. Significantly more lymph nodes were yielded after IL compared to MK (P=0.02). Surgical radicality did not differ between both groups (P=0.25). The complication rate was significantly lower in the IL group regarding anastomotic leakage (17% vs. 28%, P<0.0007) and recurrent laryngeal nerve palsy (2% vs. 6%, P<0.001). Cardiac complications were seen more frequently in patients who underwent IL (17% vs. 11%, P<0.02). No differences were observed in 30 day and 90 day mortality. Kaplan-Meier showed a better survival for IL (63%) compared to MK (58%) (log-rank p=0.07). When correcting for anastomotic leakage and infectious complications the difference in survival remained (HR=0.84, 95% CI 0.69 – 1.03). Similar results regarding postoperative complications and survival were observed in the unmatched cohort.

Conclusion
Patients who underwent an IL have better outcomes in terms of anastomotic leakage and recurrent laryngeal nerve palsy rate and overall survival compared to MK. The difference in survival appears not to be related to the differences in infectious complications. Based on these results, IL appears to be the treatment of choice in patients in whom both oncological resections are appropriate.