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Dry Rotary Swaging - Approaches for Lubricant Free Process Design
Florian Böhmermann,Henning Hasselbruch,Marius Herrmann,Oltmann Riemer,Andreas Mehner,Hans-Werner Zoch,Bernd Kuhfuss 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.2 No.4
Rotary swaging is an incremental cold forming process and allows for the cost effective manufacture of cylindrical light weight components such as rods or hollow shafts. The process has a widespread use particularly in the automotive industry for example for the manufacture of axles and steering spindles. Besides the generation of desired geometries, rotary swaging offers the advantage of improved work piece material properties due to strain hardening and furthermore the generation of variable wall thicknesses for hollow shafts, and therefore an optimal use of material resources. Nowadays rotary swaging is carried out under the use of extensive amounts of lubricant. Main functions of the lubricant are the cooling of work piece and tools, washing out of wear particles from the forming zone and process lubrication in general. Before further processing, remaining lubricant mandatorily needs to be cleaned off the work piece, increasing the costs per unit significantly. Thus, an enhancement of rotary swaging towards a lubricant free process, i.e. a dry rotary swaging, is seen to be highly innovative, both under economic and ecological aspects. However, a lubricant free process design exhibits considerably modified frictional conditions, compared to a conventional process layout. This leads to changes in the power.
Renner, Ká,roly,Henning, Sven,Mó,czó,, Já,nos,Yang, Min Soo,Choi, Hyoung Jin,Puká,nszky, Bé,la Wiley Subscription Services, Inc., A Wiley Company 2007 Polymer engineering and science Vol.47 No.8
<P>Polyamide/organophilic montmorillonite nanocomposites were prepared from two silicates with different organophilization resulting in strong and weak matrix/silicate adhesion, respectively; uncoated sodium montmorillonite was used as reference. The silicate content of the composites changed between 0 and 10 vol% in seven steps. Composite structure was characterized by X-ray diffraction and electron microscopy. Micromechanical deformation processes were followed by acoustic emission and volume strain measurements. The structure of the composites is more complicated than usually claimed; they contain individual silicate platelets, tactoids with different degree of intercalation, and larger particles. Elastic deformation and shear yielding dominates during the elongation of the specimens. The matrix polymer and the composites deform according to different mechanisms. Sound is emitted by cavitation in the former, while sound emitting processes are related tactoids and nonexfoliated particles in the composites. Acoustic events are generated mainly by the fracture of the particles. Matrix/silicate adhesion seems to be strong, debonding rarely takes place, and volume increase is initiated primarily by particle failure. The type and amount of the surfactant used for organophilization plays an important role in the determination of deformation processes and properties, since it influences both matrix/filler interaction and the inherent strength of the particles. POLYM. ENG. SCI., 47:1235–1245, 2007. © 2007 Society of Plastics Engineers</P>
Daniela Krause,Verena B. Kirnich,Theresa M. Stapf,Anika Hennings,Sabine Riemer,Michael Riedel,Ralf Schmidmaier,Francisco Pedrosa Gil,Winfried Rief,Markus J. Schwarz 대한정신약물학회 2019 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.17 No.1
Objective: Previous studies have suggested alterations in the kynurenine pathway as a major link between cytokine and neurotransmitter abnormalities in psychiatric disorders. Most of these studies used a cross-sectional case-control study design. However, knowledge is still lacking regarding the stability over time of kynurenine pathway metabolites and the functionally related cytokines. Therefore, we studied the stability of cytokines and tryptophan (TRP) parameters over a period of 12 weeks. Methods: A total of 117 participants-39 with major depression, 27 with somatoform disorder, and 51 healthy controlswere enrolled. Four evaluations, including blood withdrawal and psychometric testing, were performed over a period of 12 weeks. We used ELISA to measure interleukin (IL)-6, IL-1 receptor antagonist (RA) and tumor necrosis factor (TNF ). High-performance liquid chromatography was used to analyze neurotransmitter variables, i.e. TRP, 5-hydroxyindoleacetic acid (5-HIAA), kynurenine (KYN), 3-OH-kynurenine (3-HK), and kynurenic acid (KYNA). Results: We found no significant fluctuations of TRP, its metabolites (5-HIAA, KYN, KYNA, and 3-HK), or the cytokines (IL-1RA, IL-6, and TNF ) in any of the groups over the 12 weeks. Conclusion: To our knowledge, this is the first longitudinal study performed in psychiatric patients to verify the stability and consequently the reliability of the biological parameters we investigated. Our data indicate that TRP metabolites and cytokines are reliable biological parameters in psychiatric research because they do not fluctuate significantly over time.
Evans, D. F.,Southworth, J.,Smalley, B.,Jørgensen, U. G.,Dominik, M.,Andersen, M. I.,Bozza, V.,Bramich, D. M.,Burgdorf, M. J.,Ciceri, S.,D’Ago, G.,Figuera Jaimes, R.,Gu, S.-H.,Hinse, T. C.,Henning, Th Springer-Verlag 2018 Astronomy and astrophysics Vol.610 No.-
<P><I>Context.</I> The formation and dynamical history of hot Jupiters is currently debated, with wide stellar binaries having been suggested as a potential formation pathway. Additionally, contaminating light from both binary companions and unassociated stars can significantly bias the results of planet characterisation studies, but can be corrected for if the properties of the contaminating star are known.</P><P><I>Aim.</I> We search for binary companions to known transiting exoplanet host stars, in order to determine the multiplicity properties of hot Jupiter host stars. We also search for and characterise unassociated stars along the line of sight, allowing photometric and spectroscopic observations of the planetary system to be corrected for contaminating light.</P><P><I>Methods.</I> We analyse lucky imaging observations of 97 Southern hemisphere exoplanet host stars, using the Two Colour Instrument on the Danish 1.54 m telescope. For each detected companion star, we determine flux ratios relative to the planet host star in two passbands, and measure the relative position of the companion. The probability of each companion being physically associated was determined using our two-colour photometry.</P><P><I>Results.</I> A catalogue of close companion stars is presented, including flux ratios, position measurements, and estimated companion star temperature. For companions that are potential binary companions, we review archival and catalogue data for further evidence. For WASP-77AB and WASP-85AB, we combine our data with historical measurements to determine the binary orbits, showing them to be moderately eccentric and inclined to the line of sight (and hence planetary orbital axis). Combining our survey with the similar Friends of Hot Jupiters survey, we conclude that known hot Jupiter host stars show a deficit of high mass stellar companions compared to the field star population; however, this may be a result of the biases in detection and target selection by ground-based surveys.</P>
Degree of Brain Connectivity Predicts Eye-Tracking Variability
서민아,Rachel A. Kolster,Sumit Niogi,Bruce D. McCandliss,Richard B. Ivry,Henning U. Voss,Ranjeeta Sarkar,Jamshid Ghajar 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
Mild traumatic brain injury (mTBI) is commonly associated with diffse axonal injury (DAI), as well as performance variability and attention and working memory deficits. A visual tracking task with concurrent working memory loading may induce differential effects on performance variability among mTBI patients with varying degrees of DAI and therefore different degrees of brain connectivity. Using a multi-linear regression technique, we examined correlations between white matter integrity as detected by magnetic resonance diffusion tensor imaging and eye tracking variability under a working memory load in mTBI patients. The impact of increased working memory load on tracking variability was correlated with the degree of white matter integrity. Our results suggest that eye tracking variability under working memory loading may be used to assess the degree of DAI in mTBI patients.
Omenn, Gilbert ,S.,States, David ,J.,Adamski, Marcin,Blackwell, Thomas ,W.,Menon, Rajasree,Hermjakob, Henning,Apweiler, Rolf,Haab, Brian ,B.,Simpson, Richard ,J.,Eddes, J WILEY-VCH 2005 PROTEOMICS -WEINHEIM- Vol.5 No.13
<P>HUPO initiated the Plasma Proteome Project (PPP) in 2002. Its pilot phase has (1) evaluated advantages and limitations of many depletion, fractionation, and MS technology platforms; (2) compared PPP reference specimens of human serum and EDTA, heparin, and citrate-anti-coagulated plasma; and (3) created a publicly-available knowledge base (www.bioinformatics.med.umich.edu/hupo/ppp; www.ebi.ac.uk/pride). Thirty-five participating laboratories in 13 countries submitted datasets. Working groups addressed (a) specimen stability and protein concentrations; (b) protein identifications from 18 MS/MS datasets; (c) independent analyses from raw MS-MS spectra; (d) search engine performance, subproteome analyses, and biological insights; (e) antibody arrays; and (f) direct MS/SELDI analyses. MS-MS datasets had 15 710 different International Protein Index (IPI) protein IDs; our integration algorithm applied to multiple matches of peptide sequences yielded 9504 IPI proteins identified with one or more peptides and 3020 proteins identified with two or more peptides (the Core Dataset). These proteins have been characterized with Gene Ontology, InterPro, Novartis Atlas, OMIM, and immunoassay-based concentration determinations. The database permits examination of many other subsets, such as 1274 proteins identified with three or more peptides. Reverse protein to DNA matching identified proteins for 118 previously unidentified ORFs.</P><P>We recommend use of plasma instead of serum, with EDTA (or citrate) for anticoagulation. To improve resolution, sensitivity and reproducibility of peptide identifications and protein matches, we recommend combinations of depletion, fractionation, and MS/MS technologies, with explicit criteria for evaluation of spectra, use of search algorithms, and integration of homologous protein matches.</P><P>This Special Issue of PROTEOMICS presents papers integral to the collaborative analysis plus many reports of supplementary work on various aspects of the PPP workplan. These PPP results on complexity, dynamic range, incomplete sampling, false-positive matches, and integration of diverse datasets for plasma and serum proteins lay a foundation for development and validation of circulating protein biomarkers in health and disease.</P>