bluuebunny/crossref_metadata_2025 huggingface dataset:
Frühinterventionen nach Traumatisierung
Authors: Schäfer Sarah K. , Sopp Roxanne , Michael Tanja
Published: March 2020

Anders als andere psychische Erkrankungen haben die akute und die posttraumatische Belastungsstörung einen konkreten Auslöser in dem ihnen vorausgehenden traumatischen Ereignis. Direkt nach dem Ereignis sollte v. a. psychosoziale Akuthilfe im Vordergrund stehen, um die Entstehung von Traumafolgestörungen zu verhindern. Mit wachsendem zeitlichem Abstand werden weitere psychologische Interventionen relevant.
TelefonSeelsorge: ihr Angebot, ihre Nutzer und die Anforderungen an die Mitarbeitenden
Authors: Belzner Ruth
Published: March 2020

Jeder Kontakt in der TelefonSeelsorge erhält seine Gestalt durch 3 komplexe Determinanten: die TelefonSeelsorge als Organisation mit ihrem Selbstverständnis, ihrer Struktur und mit den Möglichkeiten und Grenzen des genutzten Mediums (Telefon, Mail, Chat), die Ratsuchende bzw. den Ratsuchenden mit dem aktuellen Thema und Anliegen, mit ihrem bzw.seinem Kommunikationsstil und Erwartungen an die TelefonSeelsorge, und den Seelsorger bzw. die Seelsorgerin mit der ihm bzw. ihr eigenen Persönlichkeit und Identität.
Notfälle und Krisen bei Kindern und Jugendlichen – was ist eigentlich normal?
Authors: Lieb Susanne , Henninger Nadja , Brünger Michael
Published: March 2020

Zu jeder gesunden Persönlichkeitsentwicklung gehören auch Krisen – insbesondere in der Jugendzeit.

Borg-Laufs et al. 2012 1

Notfallmäßige Vorstellungen und Aufnahmen von Kindern und Jugendlichen in Krisensituationen aufgrund akuter Belastungen, wegen Suizidalität, nach nicht suizidalem selbstverletzenden Verhalten oder Risikoverhalten haben sich in den letzten 15 Jahren verdoppelt bis verdreifacht. Diese stellen Kliniken und Praxen vor große Herausforderungen. Der Beitrag stellt Prinzipien und Strategien aus der dialektisch-behavioralen Therapie für Adoleszente (DBT-A) vor.
Elektronische Netzhautimplantate – ein aufgegebener Traum?
Authors: Faber Hanna , Bartz-Schmidt Karl Ulrich , Stett Alfred , Zrenner Eberhart , Stingl Katarina
Published: March 2020

Während zwischen 2005 und 2016 mehr als 30 000 Cochleaimplantate in Deutschland implantiert wurden, wurden nur weniger als 1% vergleichbarer Eingriffe an der Retina durchgeführt. Die beiden für den Markt zugelassenen Implantattypen haben wirtschaftlich nicht überleben können. Die vorliegende Arbeit diskutiert die Bedeutung und die Zukunft elektronischer Retinaimplantate für die Augenheilkunde.
Regularien und gesetzliche Bestimmungen bei klinischen
Studien mit Medizinprodukten
Authors: Schäpers Barbara , Krewer Carmen
Published: March 2020

Studien sind das Kernelement einer evidenzbasierten Medizin. Ihr Ziel ist es, dem
einzelnen Patienten die für ihn bestmögliche Behandlung zukommen zu lassen.
Welche Grundlagen und Bestimmungen es dafür gibt, erläutert dieser Bericht aus
der Forschungspraxis.
Was ist gute Therapieforschung?
Authors: Schmid Ludwig
Published: March 2020

Was ist gute Therapieforschung, und was fordert die Zukunft? Um diese Frage zu
beantworten, sollte man sich kurz die Zeit nehmen und den aktuellen Stand der
Forschungsergebnisse analysieren und kritisch beurteilen. Aber wie macht man
das? Ein Blick in aktuell gültige Leitlinien gibt Aufschluss.
Zilienabhängige RPE-Zellentwicklung und der WNT-Signalweg
Authors: Kretschmer Viola , May-Simera Helen Louise
Published: March 2020

Das retinale Pigmentepithel (RPE) ist eine hochpolarisierte Einzelschicht quaderförmiger Epithelzellen, die dicht mit Melanin gepackt sind. Sie liegt zwischen den lichtempfindlichen Außensegmenten der Photorezeptoren und der Aderhaut (Choroidea), spielt eine essenzielle Rolle bei der Entwicklung der Photorezeptoren und übernimmt wichtige Funktionen in Bezug auf Nährstoffversorgung und Erhaltung, im Retinalstoffwechsel und bei der Abschirmung von der Blutversorgung der Aderhaut. Die Photorezeptoren durchlaufen täglich einen Erneuerungsprozess, bei dem 10% der äußeren Segmente durch das retinale Pigmentepithel phagozytiert werden. Dies erfordert eine enge Wechselwirkung zwischen dem retinalen Pigmentepithel und der Retina. Daher kann eine Störung oder eine Verzögerung der Reifung des RPE erhebliche krankheitsauslösende Auswirkungen auf die Netzhaut haben, die zu einer Degeneration der Photorezeptoren führen. Auch die Alterung des RPE beeinträchtigt die unterstützenden Funktionen, was zum fortschreitenden Verlust von Photorezeptoren und Sehvermögen beiträgt. Wie viele okuläre Zelltypen bildet auch das RPE während seiner Entwicklung eine Primärzilie, eine auf Mikrotubuli basierende Ausstülpung der Zellmembran. Sie wird mit einigen wichtigen zellulären Prozessen und verschiedenen Signalwegen in Verbindung gebracht, die wichtige Funktionen in der Entwicklung unterschiedlicher Gewebe haben. Unter anderem ist der WNT-Signalweg (WNT: wingless-related integration site) essenziell für die Polarisation und Reifung des RPE und dadurch ausschlaggebend für die Funktion dieses Epithels. Der kanonische WNT-Signalweg ist zunächst für das Zellschicksal unabdingbar. Jedoch ist dessen Herunterregulieren, was von der Lokalisation von Inversin an der Basis des Ziliums und dadurch auch von der Funktionalität der ziliären BBS-Proteine (BBS: Bardet-Biedl-Syndrom) abhängt, unerlässlich für die Umstrukturierung des Zytoskeletts und den RPE-Phänotyp. Die Zilie und ihre regulatorische Funktion sind im RPE nur transient vertreten und bilden sich im Laufe der Entwicklung wieder zurück. Durch Eingriffe in den WNT-Signalweg können die Reifung und Polarisation des RPE in vitro manipuliert werden, sodass dessen Ausdifferenzierung gewährleistet und schlussendlich möglicherweise transplantierfähiges Gewebe hergestellt werden kann. Außerdem kann die Applikation von Substanzen, die in den Signalweg eingreifen, in vivo die Differenzierung des RPE verbessern und zu einer Verbesserung des Phänotyps führen, was die retinale Degeneration aufhalten kann. Diese Literaturrecherche soll die Wichtigkeit des retinalen Pigmentepithels und die Relevanz des Zusammenspiels mit dem WNT-Signalweg für die Entwicklung des Auges deutlich machen und einen Überblick über den derzeitigen Forschungsstand geben.
Fit für die Liga – Fallbeispiel: Krafttraining im Jugendsport
Authors: Hartmann Patrick
Published: March 2020

Leon ist 12 Jahre alt und möchte als Fußballer mal ganz groß rauskommen. Ein langer und anstrengender Weg liegt vor ihm. Aber er ist bereit, alles dafür zu tun. Seit einem halben Jahr macht er daher neben dem Fußballtraining ein Athletiktraining. Wie dieses aussehen muss und warum es sinnvoll ist, zeigt dieser Artikel.
Evaluation method of beam instability in laser ion source using solenoid
Authors: Karino Takahiro
Published: March 2020

In a laser ion source using solenoid field confinement, it is known that an ion beam becomes unstable in the certain range of a magnetic field. Although it is essential to quantify the instability when discussing the unstable region of the beam, it is difficult to evaluate the beam instability by peak current or the amount of charge because an irregular change of temporal profile occurs in addition to the shot-by-shot fluctuation of amplitude. In this study, I propose the most appropriate method to evaluate the beam instability using the difference from an average waveform. The validity of the new method was evaluated by comparing three evaluation methods (variation of maximum value, variation of integral of waveforms, and the proposed evaluation method) with the experimentally obtained waveforms with the stable and unstable regions of a solenoid field. The proposed method was verified to best represent the beam instability by laser-induced plasma.
Theoretical calculation of total electron-impact ionization cross section of C6F12O
Authors: Wang Yang , Tian Shuangshuang , Zhang Xiaoxing , Liu Wei , Wang Yufei , Zhang Guozhi
Published: March 2020

C6F12O can be used in gas-insulated equipment due to its excellent insulation properties. The purpose of this paper is to calculate the total electron-impact ionization cross section to evaluate the dielectric strength of the molecule using the Deutsch–Märk formula. First, according to the calculation method of quantum chemistry, the structure of the molecule is optimized. Three different methods, such as Mulliken population analysis, C-squared population analysis, and natural atomic orbital (NAO), are used to calculate the molecular orbital components, and then the molecular collision cross section is obtained. The influence of different weighting factors on the calculation results is analyzed. The validity of the proposed method is verified by the calculation results of H2O, C3H6O, and C5F10O. The results show that the calculation value with the NAO method is closer to the experimental results, which provides a reference for the calculation and analysis of the collision cross section of C6F12O. The calculation results in this paper can provide basic data for further calculation of the dielectric strength of C6F12O.
Spray-processed nanoporous BiVO4 photoanodes with high charge separation efficiency for oxygen evolution
Authors: Chen Xi , Wang Dan , Huang Yu , Zhang Yang , Li Chuang , Wang Shaotong , Liu Yichun , Zhang Xintong
Published: March 2020

Spray pyrolysis is a convenient method for fabricating BiVO4 photoanondes from a precursor solution. As the precursor solution of spray pyrolysis can significantly influence the nanostructure and the amount of oxygen vacancies of the final films, modifying the precursor solution is an efficient strategy for improving the photoelectrochemical (PEC) performance of BiVO4 photoanodes. Herein, an ultraviolet and ultrasonic treatment for modifying a vanadium precursor solution of spray pyrolysis was developed to produce efficient nanoporous BiVO4 photoanodes. By the simple treatment, the AM 1.5 photocurrent density of the photoanode reached 1.76 mA/cm2 at 1.23 V vs the reversible hydrogen electrode (RHE) for water oxidation, which is 12.3 times higher than the untreated BiVO4 photoanode. The good PEC performance was mainly attributed to the excellent charge separation that reached approximately 94.2% at 1.23 V vs RHE. Systematic studies revealed that the treatment for the precursor solution could tune the nanoporous structure and increase the amount of oxygen vacancies in the final films. This finding offers a facile and effective approach for fabricating efficient photoelectrodes for PEC water splitting.
Electrical description of an inductively coupled plasma processing reactor with discharge parameters calculated from a global model
Authors: Cao Minglu , Lu Yijia , Cheng Jia , Ji Linhong
Published: March 2020

A commercial inductively coupled plasma processing reactor is modeled by an equivalent electrical circuit combined with a global model, which calculates the electron temperature and the plasma density for Ar discharges at the pressures of 15 mTorr and 30 mTorr. Based on the transformer model, a refined electrical branch of the capacitive coupling is incorporated to obtain a complete electrical description for the reactor, which takes the coil interturn stray capacitance, wafer, and chuck into full consideration. Voltages and currents at the driving coil are recorded by using a voltage/current probe radio frequency analyzer installed after the matching unit. Using the measured voltage as an input, the total discharge current is calculated from Kirchhoff’s laws and shows excellent agreement with the measurements. The experimentally verified electrical circuit provides a comprehensive and accurate description for the reactor, which can serve as a guideline for process window planning in industrial applications.
Effects of magnetic field, electric field, and magnetic anisotropic energy on the magnetic properties of Fe alloyed GaSb diluted magnetic semiconductor
Authors: Woldetsadik Mesfin Birile , Singh Pooran , Geffe Chernet Amente
Published: March 2020

Starting with a Kondo lattice model type Hamiltonian, the effects of the magnetic field, electric field, and magnetic anisotropic energy on the magnetic properties of the Fe/GaSb diluted magnetic semiconductor are studied. The analytical technique is employed to analyze magnon dispersion, magnetization, and critical temperature, Tc. The enhancement of the temperature with increasing impurity concentration x and/or with the magnetic field and electric field is established, which is in good agreement with recent experimental observations. It is clearly shown that magnon dispersion and magnetization can be controlled with these fields applied, magnetic anisotropic energy, and impurity concentration alternatively or all together. Due to the inclusion of the magnetic anisotropic energy, we could identify a significant escalation of magnon dispersion/bandgap energy and a slight reduction of magnetization.
Usage, media, and grammaticalization
Authors: Tao Liang
Published: March 2020

This report presents a case study on a current grammatical change in a rhetorical question不是…吗(isn’t it the case…?) and its spreading from spoken Beijing Mandarin to Mandarin Chinese in general. The study addresses three interrelated issues that concern the development and spreading of this new pattern: (1) usage-based language variation and change in spoken Beijing Mandarin; (2) Socio-cultural factors that may have promoted the adaptation of the new pattern in Mandarin Chinese; and (3) the impact of media, which may enhance the rapid spreading of the pattern in China. The report offers another instance of usage as the main driving force leading to language variation and grammaticalization.
Pour une approche interprétative dans la traduction
littéraire
Authors: Ciobâcă Carmen-Ecaterina
Published: March 2020

L’article porte sur l’applicabilité de la
théorie interprétative de la traduction (TIT) à la traduction de la littérature.
Dans la première partie, nous présentons les lignes conceptuelles sur lesquelles
s’appuie la TIT, l’applicabilité de la TIT à la traduction
littéraire et les critiques formulées à son encontre. À la différence de la
traduction générale ou spécialisée, dans la traduction littéraire on distingue
le sens notionnel (informatif) du sens émotionnel (esthétique), le but de la
traduction étant l’équivalence d’effet. Dans la deuxième partie
du travail nous présentons l’applicabilité de la TIT à la traduction de
l’œuvre de Guy de Maupassant. Nous analysons la manière dont quelques
composantes de l’idiostyle de l’auteur (l’implicite, la
polysémie et l’ambiguïté, l’ironie, les euphémismes, les
culturèmes) sont traduites en roumain.
Translation and canon formation
Authors: Yu Shuang
Published: March 2020

As an essential part of the “Globalization of Chinese Culture”
strategy, the translation of Chinese fiction into English has gained more
significance and deserves more academic attention. Through making a survey of
Chinese fiction in English translation from 1978 to 2018, the article not only
presents different trajectories of the development of Chinese fiction in English
translation in mainland China and the English-speaking countries but also shows
that different canons of Chinese fiction in English translation have been formed
in the course of this development. Reasons for the formation of the prevailing
canon(s) are explored and explained from perspectives taking into account
concrete factors such as ideology, poetics and patronage as well as influences
of the literary award mechanism. Based on this description and explanation, the
article concludes with a few suggestions for the future development of cultural
activity of introducing Chinese literature into English-speaking countries.
Making a genealogy of “American linguistics” with John Eliot’sIndian Grammar Begun(1666)
Authors: Amsler Mark
Published: March 2020

In the history of linguistics John Pickering (1777–1846) and Stephen Du Ponceau’s (1760–1844) decision to reedit and republish John Eliot’s (ca. 1604–1690)The Indian Grammar Begunis an important but underrecognized event. Eliot’s grammar was first published in1666, but by the early 1800s had been mostly forgotten. Applying book history and critical discourse approaches, I argue the new 1822 edition assembled by Pickering and Du Ponceau was at the center of a newly emergent knowledge project aimed to establish an ‘American’ mode of comparative linguistics on the world intellectual stage. The grammatical analysis of Native American languages, especially Algonquin, and the critique of current European models and typologies of morphology and syntax, especially von Humboldt’s, were central to Pickering and Du Ponceau’s project. Du Ponceau may be “the father of American philology”, but he was not working alone nor did the concept of ‘Comparative Philology’ derive solely from Du Ponceau. Rather, Du Ponceau was the strategist for a more collaborative, organized approach based on the study of American Indian languages. The new edition of Eliot’s grammar reveals how Du Ponceau and Pickering were establishing an informal research network devoted to North American indigenous languages. The production and arrangement of their book depended on a broad, complex, and ultimately institutionally-supported network of scholars and amateur linguists. Their edition also shows how Du Ponceau and Pickering responded to the underlying ideological debate over “savage” languages with an emergent discourse grounded in Native American languages, ‘facts’, and ‘scientific’ linguistics.
Areal features in Gongduk, Bjokapakha and Black Mountain Mönpa phonology
Authors: Gerber Pascal
Published: March 2020

This paper argues that certain phonological similarities between the three Trans-Himalayan languages Gongduk, Bjokapakha (Tshangla) and Black Mountain Mönpa are areal features and discusses the historical and ethnolinguistic implications of this assumption. The similarities between Gongduk and Bjokapakha indicate a situation of areal convergence of recent data. This contact scenario explains certain aberrancies of Bjokapakha with regard to other Tshangla varieties. The attestation of some of the phonological features in Black Mountain Mönpa is analysed as the result of early contact between Gongduk and Black Mountain Mönpa, i.e. dating back to the time before the arrival of the East Bodish peoples in Central Bhutan.
Expressing negative meaning in Liangmai
Authors: Daimai Kailadbou , Singha Kh. Dhiren
Published: March 2020

The paper presents an overview of negative expression in Liangmai, an under-described Tibeto-Burman language, primarily spoken in the Northeast Indian states of Manipur and Nagaland. There are two ways of negative formation in the language: (i) by suffixing negative markers to the main verb, and (ii) by the use of negative particles. The main negative suffixes in Liangmai are-mak, mainly used with realis constructions;-lak, used mainly with irrealis constructions; and-tu/-duwith imperative, giving a prohibitive meaning. Negative particles used in the language includeha, which is a negative existential andraó, used to express ‘undesirability’. Additionally, a negative interjectionháiis used frequently in the language as a negative answer to a question or to contradict a statement perceived to be incorrect. Negative polarity items are form by suffixing-díto nominal stems and numerals. The present paper offers a descriptive account of negation in Liangmai, providing an overview of various constructions, namely, declarative, interrogative, imperative, relative and hortative, with negative polarity in the language.
Best-Worst-Play (BWP): A metaphor-less Optimization Algorithm
Authors: Singh Ramanpreet , Gaurav Kumar , Pathak Vimal Kumar , Singh Prem , Chaudhary Himanshu
Published: March 2020

A novel algorithm which is an ensemble of two metaphor-less algorithms is presented in this paper. The algorithm is inspired by Rao-1 and Jaya algorithms. Since the algorithm always plays around with the best and worst solutions; the algorithm is named as Best-Worst-Play (BWP) algorithm. The algorithm does not require any algorithm specific parameters, however, algorithm control parameters are required. To test the effectiveness and performance of the proposed algorithm, a number of unconstrained and constrained benchmark functions are considered. It is found that proposed algorithm has outperformed several well-established metaphor based algorithms. The proposed BWP algorithm may be used by researchers to solve the unconstrained and constrained optimization problems
Theoretical Analysis of Au-Pd Nanoalloy Clusters: A DFT Study
Authors: Ranjan Prabhat , Chakraborty Tanmoy
Published: March 2020

The study of bimetallic nanoalloy clusters has attracted a lot of attention now a days due to its unique physico-chemical properties. Among several bimetallic clusters, the compound formed between gold and palladium is of high importance due to its interesting catalytic properties. Density Functional Theory (DFT) is highly dominating method to compute the electronic properties of materials. In this article, we have reported the physical and chemical properties of AunPd (n=1-6) nanoalloy clusters in terms of Conceptual Density Functional Theory (CDFT) based descriptors. The CDFT based descriptors viz. HOMO-LUMO energy gap, hardness, softness, electronegativity andelectrophilicity index of AunPd nanoalloy clusters have been calculated. The result exhibits that energy gap of Au-Pd clusters maintain linear relationship with hardness values and inverse relationship with softness values. The HOMO-LUMO energy gap also display odd-even oscillation behavior, in which cluster containing total number of even atoms are more stable as compared to their neighbor cluster with total number of odd atoms.
Effect of multiple reinforcements (CNT/Si3N4) on hardness, electrical conductivity and friction coefficient of aluminium hybrid composites
Authors: Sethurama D , Keshavamurthy R. , Paljor S. , Rohit P.E. , Koppad Praveennath G.
Published: March 2020

Present investigation reports on the development of aluminium hybrid composites using powder metallurgy technique. Two different reinforcements namely silicon nitride (Si3N4) and carbon nanotubes (CNT) were used to reinforce pure aluminium matrix. Ball milled powder morphology and microstructure of hybrid composites were studied using scanning electron microscope to study the dispersion of Si3N4 and CNT.Microstructure studies showed uniform dispersion of both the reinforcements in aluminium matrix. Microhardness was obtained by applying a load of 50 N for dwell period of 20 seconds. Electrical conductivity in terms of %IACS was obtained using Eddy current tester. Coefficient of friction was obtained by conducting scratch test by employing a load of 10 N for a stroke length of 10 mm and scratch velocity of 0.2 mm/sec. Microhardness was found to increase with increasing content CNT content while electrical conductivity was found to decrease. Finally coefficient of friction was found to decrease with increase in CNT content owing to its lubricating nature.
Development Of Regression Model For Al6061+ Sic Tool And Optimization Of Process Parameters On Electro Discharge Machining
Authors: Kishan B. , SudheerPremkumar B. , Gajanana S. , Ravi Kumar B. , Chaitanya Kumar P.V.K
Published: March 2020

Proper selection of manufacturing conditions is one of the most important aspects to take into consideration in the majority of manufacturing processes and, particularly, in processes related to Electrical Discharge Machining (EDM). These are the conditions that determine important characteristics such as material removal rate, Electrode Wear. In the present work experiments are conducted on EDM using Al6061+SiC (with 3%,6%,9% composition of SiC in Al 6061 Alloy ),Copper and Brass materials as electrodes and EN8 steel as work material. Discharge current (IP), pulse on time (TON), pulse off time (TOFF) are selected as inout process parameters, Metal Removal Rate (MR), Tool Wear Rate (TWR) as response. Taguchi design of experiment is used to find the influence of process parameters on response and a mathematical model is developed. Percentage contribution of each factor is determined.
Combined Process of Ozonation and Membrane Processes to treat Wastewater from Batik Industry
Authors: Purnawan I. , Febriasari A. , Setyaputra B. , Yolandini T.T. , Windriyo M.J. , Karamah E.F. , Kartohardjono S.
Published: March 2020

Batik is a cultural heritage which was handed down to her craftsmen in Indonesia, even now it is recognized by UNESCO as one of the world heritages. However, the batik industry is also known as an industry that discharges a lot of wastewater so that the processing of batik waste becomes very important to prevent surface water pollution from batik wastewater. Therefore, this study aims to examine the performance of polypropylene (PP) fibers-based membrane module in wastewater treatment from the batik industry. The batik wastewater was prior treated through a combination of ozonation (O3) and flocculation, and then ultra-filtered by a PP membrane module at various trans membrane pressures (TMP). Conductivity, total suspended solids (TSS), chemical oxygen demand (COD) and color (Pt/Co) were the observed variables to examine the performance of the batik wastewater treatment process. The experimental results show that TSS, COD and Pt/Co can be reduced by about 99.8%, 24% and 57%, respectively. Meanwhile, the permeate fluxes from the membrane module were 141.3, 182.0, 243.9, 264.7 and 290.88 L.m−2.h−1 at TMP of 3, 5, 7, 9 and 11 bars, respectively.
Gasification of pre-treated palm based empty fruit bunches: effect of alkali metal content
Authors: Lim M , Ahmad Tamili S.N. , Sulaiman S.A.
Published: March 2020

This study shows that pre-treatment of empty fruit bunches (EFB) has a positive impact on the energy content of syngas from the gasification process. In Malaysia, there is an estimated 25 million tonnes of EFB which can be used for power generation or for producing value added products through gasification. Gasification is a thermochemical process where the oxidant (air) is lower than the stoichiometric requirement, thus producing volatile syngas such as carbon monoxide, methane, hydrogen that contribute to the energy content. However, EFB has relatively higher ash and alkali metal content compared to other types of biomass, such as wood. Alkali metal contents such as potassium and sodium (K and Na) have been reported to reduce the initiation temperature for the formation of slag and clinker, and can cause operational issues for gasification systems, though other results show that alkali metals increase the gasification reactivity. Pre-treatment of the EFB may be required for reducing alkali metal related operational issues, and increase the performance of gasification in terms of the energy content of the syngas. Thus, this study investigates the effect of pre-treatment on the properties of the EFB, with a focus on the alkali metal content. The correlation between the pre-treatment (and the alkali metal content) on the yield and composition of the syngas from the gasification process is investigated.
Application Simulation Research of Unmanned Aerial Vehicle Maintenance System Based on Mechanical Arm
Authors: Zhang W L , Wang W Y , Ji G Y , Shi H , Pan J , Niu P J , Su G Q
Published: March 2020

When the unmanned aerial vehicle (UAV) maintenance system based on mechanical arm contacts high-voltage transmission lines for maintenance, the insulation parts of the UAV maintenance system are prone to breakdown risk, which affects its own operation safety. In this paper, combined with the actual parameters of the transmission line and the UAV maintenance system, the finite element software is used to establish the simulation model of the mechanical arm, rotor, frame and fuselage under the transmission line and UAV maintenance system. The influence of electric field around the transmission line on the UAV maintenance system of the mechanical arm is mainly considered. The research results show that: the mechanical arm and other insulation components of UAV maintenance system will not break down during the maintenance of 35kV transmission lines. At the same time, the maximum electric field intensity and voltage value of each component in the working process of unmanned aerial vehicle maintenance system based on mechanical arm are obtained according to simulation. The research data not only provides a basis for the safe operation of transmission lines and UAV maintenance system, but also provides a reference for the design of related parts such as mechanical arm.
Fluent simulation and experimental analysis of polished surface topography of single crystal germanium
Authors: Leng Zhiyi , Yang Xiaojing
Published: March 2020

Single crystal germanium has good physical and chemical properties but it is hard to be processed. Some researchers thought the flowing effort has no effect on the removal of test-piece surface material during the polishing process. This paper had built a flow-path simulation model and used Fluent to simulate the polishing process and designed experiment to analyse the polishing process. It was found in experimental results that, during the polishing process two-phase flow could smooth the surface of single crystal germanium, but it could also cause the edge surface material uneven removal on the test-piece, moreover, the uneven degree on both sides of polished test-piece were different, the roughness on middle part of test-piece was smaller than edge sides. Meanwhile, the residual stress was mainly caused by abrasive material properties and other conditions. The conclusion mentioned above were consisted with the simulation results, which proved the correctness of simulation model and assumptions, and the flowing effect of polishing liquid had effect on the removal of surface material. The paper provides a new research thought on two phrase flow polishing.
Rolling Bearing Fault Diagnosis Method Based on Principal Components Analysis and Probabilistic Neural Network
Authors: Ni Yun Feng , Ban Dong Dong
Published: March 2020

In this paper, a rolling bearing fault diagnosismethod based on PCA and improved PNN network is proposed to solve the problems of high dimension, high redundancy, nonlinearity and nonstationarity of rolling bearingdata. Firstly, the principal components analysis (PCA) algorithm is used to extract the feature information of the original data and obtain the principal component informationafter dimension reduction. Then the principal component information is sent as a feature to the probabilistic neuralnetwork (PNN) for training and output the diagnosisresults. The method is verified using Case Western bearingdatasets. Through simulation comparison of this method and BP neural network method, the experimental results show that the method proposed in this paper is more accurate in bearing fault diagnosis.
Strength Analysis of Primary Pump Motor in Primary Reactor
Authors: Wang Dongxin
Published: March 2020

The primary pump motor, as the driving source of nuclear reactor cooling loop, is the main device to ensure the safe and stable operation of nuclear power plant. Due to the difference in rotary inertia between the rotor and the rotating shaft, radial displacement, pressure and friction torque caused by centrifugal force during high-speed operation are different. The minimum fit tolerance, fit pressure safety factor and torsion strength safety factor are calculated by the strength check theory. Then, the finite element analysis of rotor stress of a 4500kW main pump motor is carried out and stress concentration is determined for rotor root and axial ventilation hole. Finally, the finite element analysis of stress field is carried out for end ring, copper bar, guard ring and pressure ring. It is found that there is obvious stress concentration at the top hole of the guard ring and the air duct of the pressure ring, and the bending stress of the copper bar and end ring is relatively high. Combined with the results of finite element analysis, the rotor end is improved, which can effectively improve the reliability of the end, increase the ventilation area of the end and save material cost.
Parameter Optimization of Surface Roughness in Ultrasonic Vibration Cutting Process
Authors: Zhao Pengcheng , Wang Junyuan , Cao Yiming
Published: March 2020

In order to improve the processing quality of the ultrasonic vibration cutting process and reduce the surface roughness of the workpiece, based on the Response Surface Methodology (RSM), the second-order response model of 45 steel ultrasonic vibration cutting is established. The 45 steel ultrasonic vibration cutting roughness model is fitted by the central composite experiment. The reliability of the model was verified by the significance analysis based on analysis of variance and the validity analysis based on residual graph. Finally, the 3D response surface map of the surface roughness of the workpiece was cut by ultrasonic vibration, and the influence of various process parameters on the surface roughness was analyzed. The suitable cutting amount combination was selected: the spindle speed is 70.95m/min, the cutting speed is 0.11m/min, while the feed rate is 0.95mm/r and the ultrasonic amplitude is 26.80mm.
Research on Performance of Artificial Bee Colony Algorithm Based on Benchmark Test Function
Authors: Wang Ren , Shi Keke , Wang Shuqi
Published: March 2020

Because the artificial bee colony(ABC) algorithm has problems of poor development ability, slow convergence rate and easy to fall into local optimum, an improved ABC algorithm is proposed. The algorithm combines the global optimal guidance strategy, we propose a new location update formula to improve the efficiency of the iterative optimization process, and introduce the mining coefficient in the formula to improve the accuracy of global optimization. In addition, the beta distribution is introduced during the scouting bee phase, which improves the disturbance ability of the algorithm and prevents it from falling into local extremum effectively. Finally, the simulation results of four benchmark functions of Sphere, Rastrigin, Rosenbrock and Griewank show that compared with the traditional algorithm and other improved artificial bee colony algorithm, the proposed algorithm has faster convergence speed and better optimization ability.
Optimization of Coordinated Control System on Radial Basis Function Neural Network
Authors: Ni Yunfeng , Chen Songlin
Published: March 2020

Coordination control system is an indispensable part of the thermal power unit, which is a multi-input and multi-output, complex structure of the system. The coordinating way of boiler-follower has the ability of high respond to load, but this method will cause excessive fluctuation of steam pressure in the boiler, what worse is that will produce excessive pressure cause explosion if you operate in a wrong way. Above all, this paper show a new method which combines the advantages of neural network and conventional PID control to improve the load response rate of the coordinated control system. According to the characteristics of non-linearity, large inertia and large delay of the system, a 300MW unit model is adopted in this paper. After analyzing its dynamic characteristics, we decide to use PID decoupling controller to eliminate the coupling phenomenon of the system itself. A control approach based on RBF neural network is proposed. The experimental results show that the dynamic response of the system is obviously improved, the system is more stable, the response speed is faster and the satisfactory control effect is achieved.
The estimation of the laser point temperature based on CNN (Convolutional Neural Network)
Authors: Yi Yingmin , Xie Ruidong , Yang Haichuan
Published: March 2020

For the requirements of the laser temperature in additive manufacturing, there is a high precision and high heat need in the industry. The method is proposed to estimate the temperature of laser point, which is based on CNN. In this method, a model of CNN is carried out. The collected laser thermal radiation images are used to train the model. Image recognition and isotherm estimation can be obtained by the trained model. The conclusion can be verified by the experiment. The isotherm and temperature of the laser can be measured efficiently in this method.
Dynamic reliability analysis of a heat-roller based on finite element method
Authors: Wen Guang , Liu Pingping , Zuo Fangjun , Su Rui , Jia Meiwei , Li Gangjun , Kang Zeyu
Published: March 2020

Taking a heat-roller of a laser printer as the research object, the dynamic characteristics and reliability were analyzed by using the finite element software ANSYS. Through modal analysis, it can be concluded that the first eighth natural frequencies of the heat-roller are 1343, 1365, 3612, 3677, 6885, 7001, 7168, 10634 Hz. The corresponding modal modes are as follows: except that the fifth mode is the torsional mode of the structure, the other modes are the bend mode. Through the harmonic response analysis, it can be concluded that the first mode has the greatest influence on the dynamic characteristics of the structure. The sensitivity analysis results show that the material characteristics and size parameters which have great influence on the dynamic characteristics of the structure are l
2, den, ex, d
1, d
3 and x.
Static optimization design of a printer heat-roller based on sensitivity analysis
Authors: Wen Guang , Liu Pingping , Zuo Fangjun , Su Rui , Jia Meiwei , Li Gangjun
Published: March 2020

Taking the printer heat-roller as the research object, the static characteristics and sensitivity were analyzed by finite element method. Through static analysis, the static characteristics of the heat-roller under working load were obtained, and the size parameters which have great influence on the static characteristics of the structure were determined by sensitivity analysis. The heat-roller was optimized to reduce the self-weight of the structure. It is concluded that the maximum working stress of heat-roller under working load is less than the allowable stress of material, and the structural dimension meets the strength requirement. According to the sensitivity analysis results, it can be seen that the structural parameters which have great influence on the static characteristics of the heat-roller are d3, d1, l1, l2 and F. Through optimum design, the weight of the roller was reduced by 15.18%. The analysis results provide a reference for the design of other similar structures.
Design and Test of Double-pick Double-striped wheel Tooth-type Residual Film Picker
Authors: Zhang Yaxin , Li Hang , Li Shaohua , Zhang Hongze
Published: March 2020

For the wheel-toothed residual film picker on the more serious broken film pick-up effect is not ideal and the problem of picking up the film uneven lysing and designed a double-pick double-striped wheel tooth-type residual film picker. The double-pick double-striped wheel tooth-type residual film picker is composed of hydraulically adjusted double-pick double-pick double-pick pick-up machine shell device, two sets of fork-type residual film picker body and two sets of “Ya” type flexible film removal roller body. The test results show that the efficiency of double-pick edgy wheel tooth-type residual film pick-up machine whole machine scrap film pick-up is 86.5%, which meets the agronomic requirements of the residual film pick-up. At the same time, the hydraulic system adjusts the pick-up machine and the distance of cultivated land, with the arable land-shaped adjustment height, so as to effectively solve the phenomenon of uneven film collecting.
Design of A Dual-rotor Engine Driving by the Elliptic Gear
Authors: Fan Yi
Published: March 2020

Aiming at the shortcomings of the crank-connecting rod mechanism engine, such as low transmission efficiency and high side pressure between the piston and the cylinder, the paper proposes a kind of dual-rotor engine driving by the elliptic gear. The left and right rotors are driven by the gas pressure in the cylinder, and then the elliptic gears on the output shaft are driven by the circular gears and the elliptic gears on the intermediate shaft. When the gears rotate, the output shaft connected outputs power again and again. The rotor rotates one circle, the four “cylinders” separated by the rotor work one time respectively, and the output shaft rotates two circles. The results of the calculation and the simulation test show that the serialization design can be carried out by setting different parameters of the long half-axis and the eccentricity. When the value of the long half-axis (100mm in this design) is fixed and the eccentricity is 0.4, 0.6 or 0.8, the rotation angle and the speed of the left and right rotors change obviously. The greater the eccentricity, the greater the difference of the rotation angle and the speed of the left and right rotors. The higher the compression ratio of engine, the higher the transmission efficiency.
Simulation analysis and experiment research of stiffness variable shock isolator for large-scale marine equipment
Authors: Lu Xiang , Yan Xiaojie , Wu Bo
Published: March 2020

In order to analyze working performance of shock isolators for large-scale marine equipment under heavy shock load, a certain type of stiffness variable shock isolator was studied by conducting FEA calculation and shock experiments. Good agreement between the simulation and experiments proves the efficiency of calculation method. Results show that the shock isolator can provide alterable stiffness in axial compression, and absorb enough shock energy within restricted area to achieve shock isolation and elastic limit of equipment in harmony.
The method of grid map construction of visual characteristics on rocket tank surface and robot automatic cleaning path planning
Authors: Liu Xiaodong , Xu Haibo , Wang Li , Liu Li , Wang Rui
Published: March 2020

According to the actual engineering needs, this paper proposed a method of grid map construction of visual characteristics on rocket tank surface and robot automatic cleaning path planning. Through the image processing algorithm, the flange obstacle features and smudge features of the rocket tank surface are extracted, and the cleaning grid map of the rocket tank surface is constructed with this features. Aiming at the circumferential cleaning requirements of rocket tanks, a global path planning method based on artificial potential field loop traversal is proposed to achieve traversal coverage cleaning of stain points. It is verified by simulation experiments that the path planning method proposed in this paper meets the actual needs and is of great significance for realizing the cleaning automation of rocket storage tanks.
Comparative Study on Turbulence Models of High-Speed Centrifugal Pump with Low Specific Speed
Authors: Li Xiaoyu , Ji Yunguang , Cui Hongbin , Xue Shuqi
Published: March 2020

It is very important to use high-speed centrifugal pump with low specific instead of multi-stage high-pressure pump to reduce the volume of the whole marine reverse osmosis seawater desalination system. Based on the design model of high-speed centrifugal pump with low specific speed, we did a comparative study of 11 kinds of turbulence models with numerical simulation. Five methods (the convergent curves, calculation time step, characteristics curves, impeller fluid velocity and pressures, volute section surface streamline) are included to find the most suitable turbulence model. The results show that k-ε is the most suitable turbulence model to compare with design conditions and external characteristics, SST and RNG k-ε turbulence models appears more surface streamline details in the volute section.
Study on the influence of impeller area ratio parameter on performance and flow excitation of centrifugal pump
Authors: Chen Changsheng , Li Shan , Lu Ben , Lu Zhen , Zhang Yi
Published: March 2020

The internal flow passage of centrifugal pump involves many geometric parameters and area parameters, which are not independent but interrelated. Area ratio is a physical quantity which combines different area parameters together, and studies the area ratio relationship between the impeller outlet and the inlet, which can provide new ideas and methods for the improvement and optimization of centrifugal pump. In this paper, through numerical calculation, the hydraulic performance, flow characteristics and pressure pulsation characteristics of centrifugal pump under different area ratio parameters are compared. The results show that when the area ratio increases, the head and efficiency of the pump are better, and the flow excitation under the main excitation frequency decreases. In addition, the recommended area ratio value range is also given.
Design of a New Type of Hybrid Heavy Load Palletizing Robot
Authors: Shu Yang , Li Kaiming
Published: March 2020

In the field of heavy-duty palletizing robot, the mature products in the market mostly adopt series mechanism, which has the disadvantages of long arm of each joint, large driving force and high cost. Although the robot with parallel mechanism does not have the above problems, its application is restricted due to its small working space. In this paper, a new type of hybrid mechanism has been designed. We analyzed the kinematic characteristics of the mechanism, used MATLAB to simulate the workspace and kinematics, and proved that it is suitable for heavy load palletizing.
Features of Mechanical Product Manual and Its Translation Strategies
Authors: Wang Mingliang , Liu Zhihui
Published: March 2020

Mechanical product manual is a kind of application writing used to introduce the performance, specifications, use and way of maintenance about specific mechanical products. Based on the linguistic adaptation theory, the present paper probes into the research of mechanical product manual translation. The translation of mechanical product manual can offer the target language customers the equivalent product information, publicize the mechanical products, and even attract the potential customers. On this premise, a qualified translator ought to comply with the features of mechanical product manual and adopt the appropriate translation strategies so as to render a high quality translation.
Discussions on Fracture Mechanisms of Composite Insulator
Authors: Zheng Jianjun , Wei Zhigang , Gao Yunpeng , Gong Weiwei
Published: March 2020

During actual operation, the fiber reinforced plastic (FRP) rod of composite insulator was usually cracked with major characteristics of brittle and decay-like. The made a systematical expatiation of the failure modes of FRP rod, and the mechanisms of these two common fracture types were analyzed. At last, as far as possible to avoid the occurrence of FRP rod fracture accidents in the transmission lines, from the point of view of operation and running, advice about promoting the manufacture level and installation quality of composite insulators were given.
Manufacture on marine equipment special repair material—Metalock
Authors: Shen Zhelun , Wang Yaning , Song Wendong , Ji Lili , Cai Lu
Published: March 2020

As a unique cold repair process, Metalock procedure perfectly solves the problem that cast iron parts are difficult to weld, but it can be welded when the proper procedures are used. The Metalock are the core of this process. However, its preparation technology has always been foreign, that China can only cost high prices from abroad. For the purchase, the wave bond is prepared by the cold pier process, which is mainly divided into four steps of cutting, surface treatment, phosphorus saponification and rolling forming. The subject selected 304 stainless steel with higher hardness, better corrosion resistance and high temperature resistance as the main material, and manufactured Metalock through pressure die and WEDM.