7,355 research outputs found
aE Journal 2015/2016: aE/INTECTURE innovating architecture
No full textThe graduation studio of Architectural Engineering focuses on the integration of (new) technology in architecture. For this purpose, the name aE/ INTECTURE® was devised, which will be developed further as a brand in the coming years. Students start with a technical fascination and translate this into an architectural concept, finally being able to implement this within the environment in a responsible way. ‘If technology is the answer, what is the question?‘ Under the guidance of a team of enthusiastic (guest) lecturers, students search for the dot on the horizon that is necessary for coming up with solutions that improve the quality of the built environment and make it more sustainable. In addition, either the ‘making‘ (make) or ‘the energy and material flow’ (flow) is used and applied as a basis in different contexts.Architectural Engineerin
Condition Monitoring of Helical Gears Using Acoustic Emission (AE) Technology
No full textTechniques such as vibration monitoring, thermal analysis and oil analysis are well
established as means to have been used to improve reliability of gearboxes and extend
time-to-failure. In this area Acoustic Emission (AE) technology is still in its infancy but
the attention shown by researchers towards this method has increased dramatically
because several studies have shown the AE offers the important advantage of improved
sensitivity over more conventional monitoring tools for the early detection and
prediction of gear failure.
Helical gear lubrication is critically important for maintaining the integrity of operating
gears and the oil also prevents asperity contact at the gear mesh thereby protecting the
gears from a deterioration process and surface failures. In gear systems, there are three
types of lubrication regimes: Dry Running, Boundary Lubrication (BL), Hydrodynamic
Lubrication (HL) and Elastohydro-dynamic Lubrication (EHL). The last regime is
associated with the normal operating running condition of gears.
Acoustic emissions were acquired from gears and analysed for different lubrication
regimes (dry, BL, HL and EHL regimes at different temperatures), and corresponding
specific film thicknesses (λ) levels. The results showed an inverse relationship between
AE signal levels and specific film thickness (λ) of the oil. This relation was used to
determine the lubrication regime from the measured AE signals. For instance, dry
running had the highest AE levels which were attributed to the metal-to-metal contact of
the gear mesh. The BL regime had relatively high AE levels which also attributed to the
level of asperity contact is greater than the oil film thickness. The HL regime was
characterized by the lowest AE levels due to the lubricant oil completely separating the
teeth during gear meshing. Finally, the EHL regime showed intermediate AE levels
compared to the BL and HL regimes because the oil film was less than for the HL
regime but greater than for the BL regime.
It is shown that the application of advanced signal processing methods is necessary for
monitoring helical gears; Kurtosis and Spectral Kurtosis were used to investigate the
AE signatures and found to be effective in de-noising (spectral kurtosis) acquired
signals. Acoustic Emission proved to be a powerful tool to detect the oil regime for both
defective and non-defective conditions.
It is concluded that the experimental findings of this research programme will provide
the foundations for significant advancement in the application of AE for the
determining the lubrication regime present within a helical gearbox and for the detection
of developing gear faults. This should give a new impetus in the field of maintenance
and prevention of human and material catastrophes.
Several papers presenting the findings of this research have been published in
international journals and given at conferences
aE Journal 2017/2018: aE/Intecture innovating architecture
No full textDriven by the need to think differently about resources, energy, power generation, the choice of materials, and user involvement, we see the built environment in a new perspective. The program, Architectural Engineering, seeks for innovative and inspiring architectural solutions for social and environmental issues throughout all scales.To achieve this, innovation of the architectural challenge is high on our agenda. Innovation is more than just a technical improvement. How do you implement new current issues in modern architecture? We anticipate new energy, materials, and circularity. We also use the current environment of the metropolis and the countryside. We add new buildings, strengthen existing stock, and work on new components of buildings. From high to low tech. From digital to traditional, looking carefully to the context.Architectural Engineerin
Main motifs in the prose of the leftist author Kang Kyŏng-ae
No full textThe subject of this bachelor thesis is the life and work of the Korean writer Kang Kyǒng-ae, with a focus on her short prose. The aim of this thesis is an analysis of two works - Salt and Darkness - with attention to the context of the author's time. Nowadays, Kang Kyǒng-ae is considered a significant author of the 1930s and her works reflect the phenomenon of Korean emigrants in Manchuria. For a long time, leftist tendencies caused her prose to be neglected, which resulted in a considerably limited number of studies concerned with her work, in comparison to the number of studies about other writers. There are virtually no Czech studies of her work. The text of the thesis initially presents the timeframe of Kang's authorship and then analyzes select works of hers. The analysis of the works focuses on recurring motifs, which are put into a historical and social context. Keywords Kang Kyǒng-ae, Korean 1930s literature, leftist literature, Sogǔm, Ǒdu
Pressure effect on band inversion in AE Cd2 As2 (AE = Ca, Sr, Ba)
No full textRecent studies have predicted that magnetic EuCd2As2 can host several different topological states depending on its magnetic order, including a single pair of Weyl points. Here we report on the bulk properties and band inversion induced by pressure in the nonmagnetic analogs AECd2As2 (AE=Ca, Sr, Ba) as studied with density functional theory calculations. Under ambient pressure we find that these compounds are narrow band gap semiconductors, in agreement with experiment. The size of the band gap is dictated by both the increasing ionicity across the AE series which tends to increase the band gap, as well as the larger nearest neighbor Cd-As distance from increasing atomic size which can decrease the band gap because the conduction band edge is an antibonding state derived mostly from Cd 5s orbitals. The combination of these two competing effects results in a nonmonotonic change of the band gap size across the AE series with SrCd2As2 having the smallest band gap among the three compounds. The application of negative pressure reduces this band gap and causes the band inversion between the Cd 5s and As 4p orbitals along the Γ−A direction to induce a pair of Dirac points. The topological nature of the Dirac points is then confirmed by finding the closed Fermi arcs on the (10¯10) surface.</p
Biographical Romance, or The Wonders of ihe Life of An Émigrée of Choice: Fryderyk Járosy (1889–1960) – the Author of Unwritten Memoirs of Life Among the Polish Diaspora in London
No full textEnglish version. Original issue: “Archiwum Emigracji” 2009, no. 1 (10)https://apcz.umk.pl/AE/article/view/AE.2009.01
Autour du Nepos d'Alburnus, Maior, Panes, fils de Bizo (AE, 20081167=AE, 2007, 1201) : petit-fils ou neveu
No full textInternational audienceIn this article, the author studies again the inscription on a stone of a nepos from Alburnus Maior: Panes, son of Bizo (AE, 2008, 1167 = AE,2007, 1201). If the word nepos very often means « grandson », there are cases where it means « nephew ». The author pays special attention to the Latin kinship terminology in this inscription because names and lines are not Roman but peregrine. So, there is ambiguity as we cannot exactly know the relations between all these names. Now, between a grandfather and his grandson or an uncle and his nephew, there is the same number of generations. It is necessary for one to compare these to other inscriptions and words in addition to nepos (auia, auus, nurus, gener, pater, mater) or only with nepos in Rhenodanubian provinces (Raetia, Pannoniae, Moesiae, Dacia): these 67 inscriptions are in an appendix.The author concludes that the these two possibilities exist here
AE-XGBoost: A Novel Approach for Machine Tool Machining Size Prediction Combining XGBoost, AE and SHAP
No full textTo achieve intelligent manufacturing and improve the machining quality of machine tools, this paper proposes an interpretable machining size prediction model combining eXtreme Gradient Boosting (XGBoost), autoencoder (AE), and Shapley additive explanation (SHAP) analysis. In this study, XGBoost was used to establish an evaluation system for the actual machining size of computer numerical control (CNC) machine tools. The XGBoost model was combined with SHAP approximation to effectively capture local and global features in the data using autoencoders and transform the preprocessed data into more representative feature vectors. Grey correlation analysis (GRA) and principal component analysis (PCA) were used to reduce the dimensions of the original data features, and the synthetic minority overstimulation technique of the Gaussian noise regression (SMOGN) method was used to deal with the problem of data imbalance. Taking the actual size of the machine tool as the response parameter, based on the size parameters in the milling process of the CNC machine tool, the effectiveness of the model is verified. The experimental results show that the proposed AE-XGBoost model is superior to the traditional XGBoost method, and the prediction accuracy of the model is 7.11% higher than that of the traditional method. The subsequent SHAP analysis reveals the importance and interrelationship of features and provides a reliable decision support system for machine tool processing personnel, helping to improve processing quality and achieve intelligent manufacturing
Dysdera dushengi Lin & Chang & Li 2020, sp. nov.
No full textDysdera dushengi sp. nov. (Figs 1–6) Type material. Holotype ♂ (IZCAS-Ar39719), CHINA: Xinjiang Uygur Autonomous Region, Ili Kazak Autonomous Prefecture, 10 km N. of Kekedala City, 44.0244°N, 81.0180°E, elev. 751 m, 06.IV.2019, Sheng Du leg. Paratypes. 1♂, 1♀ (IZCAS-Ar39720–IZCAS-Ar39721), same data as holotype. Etymology. The species is named after Mr. Sheng Du, the collector of the holotype; noun (name) in genitive case. Diagnosis. Dysdera dushengi sp. nov. is similar to D. pamirica Dunin, 1992, which has been found only at the ridge of Peter the Great, Central Tajikistan (38.7833°N, 70.3000°E, see Dunin, 1992). Males of the two species are similar in: the ratio of the height of the tegulum to the height of the distal division, which is 1: 2 in lateral view, the semi-circular crest, and the posterior leaf-shaped apophysis but can be distinguished from D. pamirica by the tegulum and distal division which are in a straight line in lateral view (vs. angle between tegulum and distal division approximately 10° in D. pamirica) and the height of the tegulum to the length of the widest part of the crest is 1:2 (vs. 1: 1 in D. pamirica) (Figs 2, 4 A–B). Females have a similar dorsal arc of the anterior diverticulum but can be distinguished by the spermatheca which are not connected to the dorsal arc of anterior diverticulum (vs. connected to the dorsal arc of anterior diverticulum in D. pamirica), and the two extremities of the dorsal arc of the posterior diverticulum are well-developed (vs. less well developed in D. pamirica) (Figs 3, 4C). Description. Male (Figs 1 A–B, 2, 4A–B). Total length 7.37. Carapace 3.21 long, 2.31 wide. Abdomen 4.25 long, 2.34 wide. Eye sizes and inter-distances: AE 0.20, PLE 0.12, PME 0.12, AE–AE 0.44, PME–PME 0.28, PME–PLE 0.25, AE– PLE 0.28. PLE–PLE 0.52. Chelicerae 2.00 long. Fang 1.40. Legs: I 10.25 (2.88 + 3.85 + 2.88 + 0.64), II 9.40 (2.88 + 3.21 + 2.56 + 0.75), III 6.75 (2.25 + 2.00 + 2.25 + 0.25), IV 8.38 (3.00 + 2.50 + 2.50 + 0.38). Carapace red, smooth, lighter posteriorly, with sparse setae. Clypeus dark red. Chelicerae long, red, with 1 promarginal tooth and 2 retromarginal teeth. Endites and labium red. Sternum colored as endites, with sparse setae. Legs orange. Spination of leg I: femur 3d; leg II: femur 3d; leg III: femur 11–6r, 4–0v, tibia 5–6d, 5–7p, 4v, metatarsus 5–7d, 3–2p; leg IV: femur 3d, 4–2r, tibia 7–4d, 5–4p, metatarsus 6–9d, 2p, 3–0r, 4v. Abdomen oval, dorsum pale yellow, covered with setae. Bulb (Figs 2, 4 A–B) three times longer than tegulum; distal division straight in lateral view; crest semicircular, half length of tegulum; lateral sheet well-developed, with an apophysis; anterior apophysis of lateral sheet absent; AL present; posterior apophysis leaf-shaped, perpendicular to tegulum in lateral view, ratio of lateral length to length of tegulum 2: 1. Female (Figs 1 C–D, 3, 4C). Total length 7.69. Carapace 2.80 long, 1.92 wide. Abdomen 4.49 long, 0.96 wide. Eye sizes and inter-distances: AE 0.16, PLE 0.12, PME 0.12, AE–AE 0.40, PME–PME 0.24, PME–PLE 0.25, AE–PLE 0.28. PLE– PLE 0.48. Chelicerae 1.25. Fang 1.17. Legs: I 7.80 (2.20 + 3.00 + 2.00 + 0.60), II 6.74 (2.19 + 2.75 + 1.20 + 0.60), III 6.00 (1.80 + 2.00 + 1.60 + 0.60), IV 6.89 (2.56 + 1.50 + 2.20 + 0.63). Spination of leg I: femur 3d, 3–0p; leg II: femur 2d; leg III: femur 3–0d, 1–0r, tibia 3r, 3–5p, 3–1d, metatarsus 3–6d, 2–3p, 4r, 1–3v; leg IV: femur 7–4r, tibia 4–5p, 3–2d, metatarsus 3– 7d, 2– 1p. Appearance as in male. Endogyne (Figs 3, 4C): Anterior spermatheca with straight lateral wings, four times wider than long, neck of spermatheca visible; dorsal arc of anterior diverticulum ladder-shaped, two times wider than long; terminus of dorsal arc of posterior diverticulum well-developed; ventral wall triangular. Distribution. Known only from the type locality. Life history. All specimens of the new species were collected under stones on a rocky massif.Published as part of Lin, Yejie, Chang, Wan-Jin & Li, Shuqiang, 2020, Dysdera dushengi sp. nov., the easternmost species of the spider family Dysderidae (Arachnida: Araneae), pp. 97-103 in Zoological Systematics 45 (2) on pages 100-102, DOI: 10.11865/zs.202014, http://zenodo.org/record/461722
- …
