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  • 1
    Digitale Medien
    Digitale Medien
    Finite element analysis of temperature field with phase transformation and non-linear surface heat-transfer coefficient during quenching (1998)
    Springer
    Applied mathematics and mechanics 19 (1998), S. 15-20 
    Details
    ISSN: 1573-2754
    Schlagwort(e): finite element method ; quenching ; heat conduction ; phase transformation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Mathematik , Physik
    Notizen: Abstract The calculation of temperature field has a great influence upon the analysis of the thermal stresses and strains during quenching, and also upon the residual stresses and microstructure of the workpiece after quenching, too. In this paper, a 42CrMo steel cylinder was taken as an investigating example. From the TTT diagram of the 42 CrMo steel, the CCT diagram was simulated by mathematical transformation, and the volume fraction of phase constituents was calculated. The thermal physical properties were treated as the functions of temperature and the volume fraction of phase constitutents. Finally, the temperature field with phase transformation and non-linear surface heat-transfer coefficients was calculated with finite element method, and the corresponding functional of temperature was established.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02458976
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  • 2
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    The possibly important role played by Ga2O3 during the activation of GaN photocathode (2015)
    American Institute of Physics (AIP)
    Details
    Publikationsdatum: 2015-08-14
    Beschreibung: Three different chemical solutions are used to remove the possible contamination on GaN surface, while Ga 2 O 3 is still found at the surface. After thermal annealing at 710 °C in the ultrahigh vacuum (UHV) chamber and activated with Cs/O, all the GaN samples are successfully activated to the effective negative electron affinity (NEA) photocathodes. Among all samples, the GaN sample with the highest content of Ga 2 O 3 after chemical cleaning obtains the highest quantum efficiency. By analyzing the property of Ga 2 O 3 , the surface processing results, and electron affinity variations during Cs and Cs/O 2 deposition on GaN of other groups, it is suggested that before the adsorption of Cs, Ga 2 O 3 is not completely removed from GaN surface in our samples, which will combine with Cs and lead to a large decrease in electron affinity. Furthermore, the effective NEA is formed for GaN photocathode, along with the surface downward band bending. Based on this assumption, a new dipole model Ga 2 O 3 -Cs is suggested, and the experimental effects are explained and discussed.
    Print ISSN: 0021-8979
    Digitale ISSN: 1089-7550
    Thema: Physik
    Publiziert von American Institute of Physics (AIP)
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  • 3
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    Direct differentiation of hepatic stem-like WB cells into insulin-producing cells using small molecules (2013)
    Springer Nature
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    Publikationsdatum: 2013-02-01
    Beschreibung: Recent evidence suggests that experimental induction of hepatocytes into pancreatic cells provides new cell transplantation therapy prospects for type 1 diabetes mellitus. Stepwise differentiation from rat liver epithelial stem-like WB-F344 cells (WB cells) into functional insulin-secreting cells will identify key steps in β-cell development and may yet prove useful for transplantation therapy for diabetic patients. An essential step in this protocol was the generation of pancreatic precursor cell that express Pdx1 based on induction by a combination of 5-aza-2′-deoxycytidine, trichostatin A, retinoic acid, and a mix of insulin, transferrin and selenite. The Pdx1-expressing cells express other pancreatic markers and contribute to endocrine cells in vitro and in vivo. This study indicates an efficient chemical protocol for differentiating WB cells into functional insulin-producing cells using small molecules, and represents a promising hepatocyte-based treatment for diabetes mellitus. Scientific Reports 3 doi: 10.1038/srep01185
    Digitale ISSN: 2045-2322
    Thema: Allgemeine Naturwissenschaft
    Publiziert von Springer Nature
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  • 4
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    Digital Precision Design For a Platinum Gold Mine With Deep Ming in South Africa (2018)
    Institute of Physics (IOP)
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    Publikationsdatum: 2018-11-07
    Beschreibung: A platinum mine in South Africa is a deep mining mine that the mining design involves a series of difficult problems, such as high stress, high temperature and high lifting and so on. Choosing the right mining method and developing system is the key technology to solve these problems, and is also an important plan for mining design. First of all, based on multi index factors, 6 mining methods were quantitatively analyzed and scored, and the subleve open stoping method was chosen as the best mining method. In order to ensure the safety of this mining method, the hydraulic radius theory is introduced to analyze stope structural parameters stability. Secondly, with the view of global mining technology, we compared the development system of South Africa, China, Australia and other countries, and compared 6 development options in terms of technical, economic and security factors. The final selection of the development system combines the Chinese and Western design concepts, absorbs t...
    Print ISSN: 1755-1307
    Digitale ISSN: 1755-1315
    Thema: Geographie , Geologie und Paläontologie , Physik
    Publiziert von Institute of Physics (IOP)
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  • 5
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    Water, Vol. 9, Pages 669: Debris Flow Susceptibility Assessment in the Wudongde Dam Area, China Based on Rock Engineering System and Fuzzy C-Means Algorithm (2017)
    MDPI Publishing
    In: Water
    Details
    Publikationsdatum: 2017-09-05
    Beschreibung: Water, Vol. 9, Pages 669: Debris Flow Susceptibility Assessment in the Wudongde Dam Area, China Based on Rock Engineering System and Fuzzy C-Means Algorithm Water doi: 10.3390/w9090669 Authors: Yanyan Li Honggang Wang Jianping Chen Yanjun Shang Debris flows in the Wudongde dam area, China could pose a huge threat to the running of the power station. Therefore, it is of great significance to carry out a susceptibility analysis for this area. This paper presents an application of the rock engineering system and fuzzy C-means algorithm (RES_FCM) for debris flow susceptibility assessment. The watershed of the Jinsha River close to the Wudongde dam site in southwest China was taken as the study area, where a total of 22 channelized debris flow gullies were mapped by field investigations. Eight environmental parameters were selected for debris flow susceptibility assessment, namely, lithology, watershed area, slope angle, stream density, length of the main stream, curvature of the main stream, distance from fault and vegetation cover ratio. The interactions among these parameters and their weightings were determined using the RES method. A debris flow susceptibility map was produced by dividing the gullies into three categories of debris flow susceptibility based on the susceptibility index (SI) using the FCM algorithm. The results show that the susceptibility levels for nine of the debris flow gullies are high, nine are moderate and four are low, respectively. The RES based K-means algorithm (RES_KM) was used for comparison. The results suggest that the RES_FCM method and the RES_KM method provide very close evaluation results for most of the debris flow gullies, which also agree well with field investigations. The prediction accuracy of the new method is 90.9%, larger than that obtained by the RES_KM method (86.4%). Therefore, the RES_FCM method performs better than the RES_KM method for assessing the susceptibility of debris flows.
    Digitale ISSN: 2073-4441
    Thema: Energietechnik
    Publiziert von MDPI Publishing
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  • 6
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    Wheat Ms2 encodes for an orphan protein that confers male sterility in grass species (2017)
    Springer Nature
    Details
    Publikationsdatum: 2017-04-29
    Beschreibung: Wheat Ms2 encodes for an orphan protein that confers male sterility in grass species Nature Communications, Published online: 28 April 2017; doi:10.1038/ncomms15121 The dominant male-sterile gene Ms2 has facilitated the release of hundreds of wheat-breeding lines and cultivars in China. Here Ni et al . describe the cloning of the Ms2 gene, which appears as an orphan gene in the Triticinae, and show that Ms2 can be used to confer male sterility in wheat, barley and Brachypodium .
    Digitale ISSN: 2041-1723
    Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft , Physik
    Publiziert von Springer Nature
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  • 7
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    Investigation of a K-band large coaxial relativistic backward wave oscillator (2016)
    American Institute of Physics (AIP)
    Details
    Publikationsdatum: 2016-01-16
    Beschreibung: A K-band large coaxial relativistic backward wave oscillator has been investigated by the 2.5-D particle-in-cell code. This device can generate high-power microwave at a constant frequency with a constant efficiency by increasing the radius of the electron beam and the average radius of the slow-wave structure. The simulation results show that the power conversion efficiency can reach 38.8% at the frequency of 25.48 GHz with the output power of 1.65 GW, while the electron beam has the energy of 196 kV and carries the current of 21.6 kA guided by the magnetic field of 2.5 T.
    Print ISSN: 1070-664X
    Digitale ISSN: 1089-7674
    Thema: Physik
    Publiziert von American Institute of Physics (AIP)
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  • 8
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    Sensors, Vol. 16, Pages 1982: Service Demand Discovery Mechanism for Mobile Social Networks (2016)
    MDPI Publishing
    In: Sensors
    Details
    Publikationsdatum: 2016-11-24
    Beschreibung: In the last few years, the service demand for wireless data over mobile networks has continually been soaring at a rapid pace. Thereinto, in Mobile Social Networks (MSNs), users can discover adjacent users for establishing temporary local connection and thus sharing already downloaded contents with each other to offload the service demand. Due to the partitioned topology, intermittent connection and social feature in such a network, the service demand discovery is challenging. In particular, the service demand discovery is exploited to identify the best relay user through the service registration, service selection and service activation. In order to maximize the utilization of limited network resources, a hybrid service demand discovery architecture, such as a Virtual Dictionary User (VDU) is proposed in this paper. Based on the historical data of movement, users can discover their relationships with others. Subsequently, according to the users activity, VDU is selected to facilitate the service registration procedure. Further, the service information outside of a home community can be obtained through the Global Active User (GAU) to support the service selection. To provide the Quality of Service (QoS), the Service Providing User (SPU) is chosen among multiple candidates. Numerical results show that, when compared with other classical service algorithms, the proposed scheme can improve the successful service demand discovery ratio by 25% under reduced overheads.
    Digitale ISSN: 1424-8220
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Publiziert von MDPI Publishing
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  • 9
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    Fecal microbiota transplantation results in bacterial strain displacement in patients with inflammatory bowel diseases (2019)
    Elsevier
    Details
    Publikationsdatum: 2019
    Beschreibung: Abstract Fecal microbiota transplantation (FMT), which is thought to have the potential to correct dysbiosis of gut microbiota, has been used to treat inflammatory bowel disease (IBD) for almost a decade. Here, we report an interventional prospective cohort study performed to elucidate the extent of and processes underlying microbiota engraftment in IBD patients after FMT treatment. The cohort included two categories of patients: (1) patients with moderate to severe Crohn’s disease (CD)（Harvey‐Bradshaw Index ≥ 7, n = 11） and (2) patients with ulcerative colitis (UC) (Montreal classification S2 and S3, n = 4). All patients were treated with a single FMT (via mid‐gut, from healthy donors) and follow‐up visits were performed at baseline, 3 days, one week, and one month after FMT (missing time points included). At each follow‐up time point, fecal samples and clinical metadata were collected. For comparative analysis, 10 fecal samples from 10 healthy donors were included to represent the diversity level of normal gut microbiota. Additionally, the metagenomic data of 25 fecal samples from 5 individuals with metabolic syndrome who underwent autologous FMT treatment were downloaded from a previous published paper to represent fluctuations in microbiota induced during FMT. All fecal samples underwent shotgun metagenomic sequencing. We found that 3 days after FMT, 11 out of 15 recipients were in remission (3 out of 4 UC recipients; 8 out of 11 CD recipients). Generally, bacterial colonization was observed to be lower in CD recipients than in UC recipients at both species and strain levels. Furthermore, across species, different strains displayed disease‐specific displacement advantages under two‐disease status. Finally, most post‐FMT species (〉 80%) could be properly predicted (AUC 〉 85%) using a random forest classification model, with the gut microbiota composition and clinical parameters of pre‐FMT recipients acting as factors that contribute to prediction accuracy.
    Digitale ISSN: 2211-5463
    Thema: Biologie
    Publiziert von Elsevier im Namen von The Federation of European Biochemical Societies (FEBS).
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  • 10
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    Optimization of K-medoids Algorithm for Initial Clustering Center (2020)
    Institute of Physics
    Details
    Publikationsdatum: 2020-03-01
    Print ISSN: 1742-6588
    Digitale ISSN: 1742-6596
    Thema: Physik
    Publiziert von Institute of Physics
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