A Robust Method for Detecting Wind-Fallen Stems from Aerial RGB Images Using a Line Segment Detection Algorithm

Increased frequencies and windspeeds of storms may cause disproportionately high increases in windthrow damage. Storm-felled trees provide a surplus of breeding material for bark beetles, often resulting in calamities in the subsequent years. Thus, the timely removal of fallen trees is regarded as a good management practice that requires strategic planning of salvage harvesting. Precise information on the number of stems and their location and orientation are needed for the efficient planning of strip roads and/or cable yarding lines. An accurate assessment of these data using conventional field-based methods is very difficult and time-consuming; remote sensing techniques may be a cost-efficient alternative. In this research, a methodology for the automatic detection of fallen stems from aerial RGB images is presented. The presented methodology was based on a line segment detection algorithm and proved to be robust regarding image quality. It was shown that the method can detect frequency, position, spatial distribution and orientation of fallen stems with high accuracy, while stem lengths were systematically underestimated. The methodology can be used for the optimized planning of salvage harvesting in the future and may thus help to reduce consequential bark beetle calamities after storm events.

Cross Product and Partitioned Filtering-Based Graham Convex Hull for Buoy Drifting Area Demarcating

An improved Graham scan convex hull algorithm is designed using the convex hull region shrinkage algorithm and the sample selection decision algorithm. In the sorting of Graham scan convex hull algorithm, the cross-multiplication method is used instead of the operation of finding the polar angle, which avoids the high computational complexity of finding the inverse trigonometric function. When the polar angles are the same, that is, the two points are collinear, the points close to each other are deleted directly. Select the maximal horizontal ordinate point, minimal horizontal ordinate point, maximal longitudinal coordinate point, and minimal longitudinal coordinate point. Connect these points and obtain lines. The whole plane is divided into different regions. The points that are not on the convex hull are deleted, and the redundant points are removed. This can speed up the calculation of approximate convex hull boundary and shorten the time of convex hull calculation. The proposed algorithm is used for buoy drifting area demarcating. The offsets of the geometric center of the high-frequency position point and the distance from geometric center of high-frequency position of buoy to sinking stone are calculated. The experimental results show that the new algorithm can effectively accelerate the convex hull calculation. We use the convex hull process to compute the area of the drifting buoy position and discover that the drift area of the port hand buoy is similar. The drift area of the port hand buoys is similar. The drift area of the port hand buoy is greater than that of the port hand buoy.

Adaptive Navigation Algorithm with Deep Learning for Autonomous Underwater Vehicle

Precise navigation is essential for autonomous underwater vehicles (AUVs). The measurement deviation of the navigation sensors, especially the microelectromechanical systems (MEMS) sensors, is a crucial factor that affects the localization accuracy. Deep learning is a novel method to solve this problem. However, the calculation cycle and robustness of the deep learning method may be insufficient in practical application. This paper proposes an adaptive navigation algorithm with deep learning to address these questions and realize accurate navigation. Firstly, this algorithm uses deep learning to generate low-frequency position information to correct the error accumulation of the navigation system. Secondly, the χ2 rule is selected to judge if the Doppler velocity log (DVL) measurement fails, which could avoid interference from DVL outliers. Thirdly, the adaptive filter, based on the variational Bayesian (VB) method, is employed to estimate the navigation information simultaneous with the measurement covariance, improving navigation accuracy even more. The experimental results, based on AUV field data, show that the proposed algorithm could realize robust navigation performance and significantly improve position accuracy.

THE USE OF (Mg0.9Zn0.1)TiO3+2wt.% Bi2O3 CERAMICS AS A DIELECTRIC RESONATOR OSCILLATOR MATERIAL AND CHARACTERISATION OF STRUCTURE, MICROSTRUCTURE, AND DENSITY

Magnesium titanate (MgTiO3)-based ceramics have the potential for use in the telecommunications industry at microwave frequencies, including as a resonator in dielectric resonator oscillator (DRO) circuit. This research is intended to study the application of (Mg0.9Z0.1)TiO3+2wt.% Bi2O3 (abbreviated MZT01-2) ceramics as DRO material and characterize the structure, microstructure, and bulk density. Fabrication was carried out by ball milling between (Mg0.9Z0.1)TiO3 crystalline powder and 2wt.% Bi2O3 powder. The milled powder was compacted at certain pressure using a die press to become pellets. All pellets were sintered at 1000, 1100, 1200°C for 4 h to obtain ceramics. The structural characterization using XRD showed that the three ceramics contained the main MgTiO3 phase, each 93.63, 93.83, and 90.78% molar, the rest was the MgTi2O5 phase. The increase in sinter temperature causes the lattice parameter and the unit cell volume to decrease. The Archimedes bulk density was 2.928; 2.832 and 2.736 g/cm3. The microstructure is solid surfaces with a grain diameter of 1.9-2.3 μm accompanied by pores. As DRO materials, the three ceramics exhibited a resonant frequency at 5.11, 5.08, and 5.12 GHz which shows that the ceramics can be applied as DRO materials at microwave frequencies. The sinter temperature variation tends not to affect the resonant frequency position.

Disorder Classification of the Vibrational Spectra of Modern Glasses

Using the coherent-potential approximation in heterogeneous-elasticity theory with a log-normal distribution of elastic constants for the description of the Raman spectrum and the temperature dependence of the specifi?c heat, we are able to reconstruct the vibrational density of states and characteristic descriptors of the elastic heterogeneity of a wide range of glassy materials. These descriptors are the non-affi?ne contribution to the shear modulus, the mean-square fluctuation of the local elasticity, and its correlation length. They enable a physical classification scheme for disorder in modern, industrially relevant glass materials. <br><div>We apply our procedure to a broad range of real-world glass compositions, including metallic,oxide, chalcogenide, hybrid and polymer glasses. Universal relationships between the descriptors on the one side, and the height and frequency position of the boson peak, the Poisson ratio and theliquid fragility index on the other side are established.</div>

Disorder Classification of the Vibrational Spectra of Modern Glasses

Using the coherent-potential approximation in heterogeneous-elasticity theory with a log-normal distribution of elastic constants for the description of the Raman spectrum and the temperature dependence of the specifi?c heat, we are able to reconstruct the vibrational density of states and characteristic descriptors of the elastic heterogeneity of a wide range of glassy materials. These descriptors are the non-affi?ne contribution to the shear modulus, the mean-square fluctuation of the local elasticity, and its correlation length. They enable a physical classification scheme for disorder in modern, industrially relevant glass materials. <br><div>We apply our procedure to a broad range of real-world glass compositions, including metallic,oxide, chalcogenide, hybrid and polymer glasses. Universal relationships between the descriptors on the one side, and the height and frequency position of the boson peak, the Poisson ratio and theliquid fragility index on the other side are established.</div>

Contactless Temperature Sensing at the Microscale Based on Titanium Dioxide Raman Thermometry

The determination of local temperature at the nanoscale is a key point to govern physical, chemical and biological processes, strongly influenced by temperature. Since a wide range of applications, from nanomedicine to nano- or micro-electronics, requires a precise determination of the local temperature, significant efforts have to be devoted to nanothermometry. The identification of efficient materials and the implementation of detection techniques are still a hot topic in nanothermometry. Many strategies have been already investigated and applied to real cases, but there is an urgent need to develop new protocols allowing for accurate and sensitive temperature determination. The focus of this work is the investigation of efficient optical thermometers, with potential applications in the biological field. Among the different optical techniques, Raman spectroscopy is currently emerging as a very interesting tool. Its main advantages rely on the possibility of carrying out non-destructive and non-contact measurements with high spatial resolution, reaching even the nanoscale. Temperature variations can be determined by following the changes in intensity, frequency position and width of one or more bands. Concerning the materials, Titanium dioxide has been chosen as Raman active material because of its intense cross-section and its biocompatibility, as already demonstrated in literature. Raman measurements have been performed on commercial anatase powder, with a crystallite dimension of hundreds of nm, using 488.0, 514.5, 568.2 and 647.1 nm excitation lines of the CW Ar+/Kr+ ion laser. The laser beam was focalized through a microscope on the sample, kept at defined temperature using a temperature controller, and the temperature was varied in the range of 283–323 K. The Stokes and anti-Stokes scattered light was analyzed through a triple monochromator and detected by a liquid nitrogen-cooled CCD camera. Raw data have been analyzed with Matlab, and Raman spectrum parameters—such as area, intensity, frequency position and width of the peak—have been calculated using a Lorentz fitting curve. Results obtained, calculating the anti-Stokes/Stokes area ratio, demonstrate that the Raman modes of anatase, in particular the Eg one at 143 cm−1, are excellent candidates for the local temperature detection in the visible range.

Binômes et polynômes dans la Chançun d’Willame

"Binomials and Polynomials in the Chançun d’Willame. The paper explores binomial constructions (a common stylistic feature of all European medieval literatures) in the Old French epic poem Chançun d’Willame (c. 1200). It analyses the frequency, position, internal structure, and degree of variation of this figure in the poem’s two parts, and compares them to binomial constructions in the Song of Roland, and in romances from the same period. The paper shows that, at a micro-level, this stylistic figure is yet another feature distinguishing the two parts of the William poem. In the more archaïc part, binomials are rigid and formulaic, while in the more recent, romance-like part, they are flexible and creative. At the macro-level, binomial constructions are similarly used (often to achieve assonance) in this poem and in Roland, but differently in the romances. Binomials thus belong to the complex system of formal clues that characterise a medieval “genre”. Keywords: binomial constructions, Chançun d’Willame, medieval epic, chanson de geste, assonance "

Translation of Idioms: How They are Reflected in Movie Subtitling

Idiomatic expressions are expressions with a figurative meaning different from their literal meaning, and therefore, they cannot be understood literally. This study aims to scrutinize some aspects of the translation of idiomatic expressions in a mystery movie entitled ‘Murder on the Orient Express’. Seventy-seven idiomatic expressions were found in the movie. The idioms can be categorized as follows: keywords with idiomatic uses (16) idioms with nouns and adjectives (2), idiomatic pairs (1), idioms with prepositions (7), phrasal verbs idioms (26), verbal idioms (5), idioms from special subjects (1), idioms with key words from special categories (16), and idioms with comparison (3). Phrasal verbs idiom was the most frequently occurred because idioms are mostly organized by verb comprising the combination of verb and preposition or verb and adverb. Further, the rendering of the idioms from English as the Source Language (SL) into Indonesian as the Target Language (TL) employed some strategies; translation by paraphrase was the highly frequent translation strategy. The strategy of using an idiom of similar meaning but dissimilar form was also located in the high-frequency position of the continuum. Furthermore, using an idiom of similar form and meaning and translation by omission were the translation strategies of low frequency. Translation by paraphrase was frequently used because the translator wanted to convey the meaning as clearly as possible while also considering the cultural difference between SL and TL. To sum up, the idiomatic expression dominantly used in the movie was phrasal verbs (34%), while the strategy that was mostly applied in translating them was translation by paraphrase (56%).

Translation of Idioms: How They are Reflected in Movie Subtitling

Idiomatic expressions are expressions with a figurative meaning different from their literal meaning, and therefore, they cannot be understood literally. This study aims to scrutinize some aspects of the translation of idiomatic expressions in a mystery movie entitled ‘Murder on the Orient Express’. Seventy-seven idiomatic expressions were found in the movie. The idioms can be categorized as follows: keywords with idiomatic uses (16) idioms with nouns and adjectives (2), idiomatic pairs (1), idioms with prepositions (7), phrasal verbs idioms (26), verbal idioms (5), idioms from special subjects (1), idioms with key words from special categories (16), and idioms with comparison (3). Phrasal verbs idiom was the most frequently occurred because idioms are mostly organized by verb comprising the combination of verb and preposition or verb and adverb. Further, the rendering of the idioms from English as the Source Language (SL) into Indonesian as the Target Language (TL) employed some strategies; translation by paraphrase was the highly frequent translation strategy. The strategy of using an idiom of similar meaning but dissimilar form was also located in the high-frequency position of the continuum. Furthermore, using an idiom of similar form and meaning and translation by omission were the translation strategies of low frequency. Translation by paraphrase was frequently used because the translator wanted to convey the meaning as clearly as possible while also considering the cultural difference between SL and TL. To sum up, the idiomatic expression dominantly used in the movie was phrasal verbs (34%), while the strategy that was mostly applied in translating them was translation by paraphrase (56%).