bluuebunny/crossref_metadata_2025 huggingface dataset:
Inhomogeneous Dark Fluid and Dark Matter, Leading to a Bounce Cosmology
Authors: Brevik Iver , Timoshkin Alexander
Published: March 2015

The purpose of this short review is to describe cosmological models with a linear inhomogeneous time-dependent equation of state (EoS) for dark energy, when dark fluid is coupled with dark matter. This may lead to a bounce cosmology. We consider equivalent descriptions in terms of the EoS parameters for an exponential, a power-law, or a double-exponential law for the scale factor a. Stability issues are discussed by considering small perturbations around the critical points for the bounce, in the early as well as in the late, universe. The latter part of the paper is concerned with dark energy coupled with dark matter in viscous fluid cosmology. We allow the bulk viscosity ζ = ζ(H, t) to be a function of the Hubble parameter and the time, and consider the Little Rip, the Pseudo Rip, and the bounce universe. Analytic expressions for characteristic properties of these cosmological models are obtained.
Dissecting a QTL into Candidate Genes Highlighted the Key Role of Pectinesterases in Regulating the Ascorbic Acid Content in Tomato Fruit
Authors: Ruggieri Valentino , Sacco Adriana , Calafiore Roberta , Frusciante Luigi , Barone Amalia
Published: March 2015

Tomato (Solanum lycopersicum) is a crucial component of the human diet because of its high nutritional value and the antioxidant content of its fruit. As a member of the Solanaceae family, it is considered a model species for genomic studies in this family, especially since its genome has been completely sequenced. Among genomic resources available, Solanum pennellii introgression lines represent a valuable tool to mine the genetic diversity present in wild species. One introgression line, IL12‐4, was previously selected for high ascorbic acid (AsA) content, and a transcriptomic analysis indicated the involvement of genes controlling pectin degradation in AsA accumulation. In this study the integration of data from different “omics” platforms has been exploited to identify candidate genes that increase AsA belonging to the wild region 12‐4. Thirty‐two genes potentially involved in pathways controlling AsA levels were analyzed with bioinformatic tools. Two hundred‐fifty nonsynonymous polymorphisms were detected in their coding regions, and 11.6% revealed deleterious effects on predicted protein function. To reduce the number of genes that had to be functionally validated, introgression sublines of the region 12–4 were selected using species‐specific polymorphic markers between the two Solanum species. Four sublines were obtained and we demonstrated that a subregion of around 1 Mbp includes 12 candidate genes potentially involved in AsA accumulation. Among these, only five exhibited structural deleterious variants, and one of the 12 was differentially expressed between the two Solanum species. We have highlighted the role of three polymorphic pectinesterases and inhibitors of pectinesterases that merit further investigation.
De Novo Assembly and Characterization of Tall Fescue Transcriptome under Water Stress
Authors: Talukder S. K. , Azhaguvel P. , Mukherjee S. , Young C. A. , Tang Y. , Krom N. , Saha M. C.
Published: March 2015

Water stress is a fundamental problem for tall fescue [Lolium arundinaceum (Schreb.) Darbysh.] cultivation in the south–central United States. Genetic improvement of tall fescue for water‐stress tolerance is the key strategy for improving its persistence in the region. Genotypes with contrasting characteristics for relative water content and osmotic potential were identified from a tall fescue population. Transcriptome profiling between water‐stress‐tolerant (B400) and water‐stress‐susceptible (W279) genotypes was performed to unravel the genetic regulatory mechanism of water‐stress responses in tall fescue. RNA samples from leaf, shoot, root, and inflorescence were pooled and sequenced through Illumina paired‐end sequencing. A total of 199,399 contigs were assembled with an average length of 585 bp. Between the two genotypes, 2986 reference transcripts (RTs) were significantly differentially expressed and 1048 of them could be annotated and found to associate with metabolic pathways and enzyme coding genes. In total, 175 differentially expressed RTs were reported for various stress‐related functions. Among those, 65 encoded kinase proteins, 40 each encoded transposons, and transporter proteins were previously reported to be involved with abiotic stress responses. A total of 6348 simple sequence repeats and 6658 single‐nucleotide polymorphisms were identified in the contig sequences. Primers were developed from the corresponding sequences, which might be used as candidate gene markers in tall fescue. This study will lead to identification of genes or transcription factors related to water‐stress tolerance and development of a comprehensive molecular marker system to facilitate marker‐assisted breeding in tall fescue.
INVESTIGATION INTO PLASTIC CARDS / PLASTIKINIŲ KORTELIŲ LAMINAVIMO KOKYBĖS TYRIMAS
Authors: Stašelytė Neringa , Šešok Nikolaj , Iljin Igor
Published: March 2015

The article examines the strength of laminating plastic cards at different lamination temperatures. For investigation purposes, two types of plastic substrate and films have been used. Laminate strength has been tested (CMYK) to establish the impact of colours on the strength of laminate. The paper compares inks supplied by two different producers. The colour characteristics of CIE L*a*b* space before and after the lamination process have been found. According to lamination strength and characteristics of the colours, the most suitable inks, temperature and films have been chosen.
Straipsnyje ištirtas plastikinių kortelių laminavimo stipris esant skirtingoms laminavimo temperatūroms. Tyrimui naudota dviejų rūšių plastiko pagrindas ir plėvelės. Laminato stipris testuotas, siekiant nustatyti spalvų įtaką laminato stipriui. Straipsnyje lyginami dviejų gamintojų dažai. Ištirtos atspaudų spalvinės charakteristikos CIE L*a*b* spalvų erdvėje prieš laminavimą ir po jo. Pateikiamos rekomendacijos, leidžiančios atsižvelgus į laminavimo stiprio ir spalvines charakteristikas parinkti tinkamiausius dažus, temperatūrą ir plėvelę.
RESEARCH ON THE HYSTERESIS EFFECT ON POSITIONING THE SYSTEM WITH FLEXIBLE ELEMENTS / POZICIONAVIMO SISTEMOS SU LANKSČIAISIAIS ELEMENTAIS HISTEREZĖS EFEKTO TYRIMAS
Authors: Čereška Audrius , Augustinavičius Giedrius
Published: March 2015

The paper analyzes the hysteresis phenomenon of positioning systems with flexible elements for transmitting motion of which piezoelectric actuators are used. The article investigates the influence of hysteresis on the accuracy of positioning systems. A special test bench for conducting research and stand-up methodology for carrying out experimental researches have been used. The test bench includes a computer piezo controller, an inductive displacement sensor and a dynamic data collector used for gathering data and transmitting it to the software package. Mathematical modelling of hysteresis using Matlab/Simulink software package has been done. The performed research has shown that the hysteresis model of maximum dispersion error compared to experimental results makes less than 5%. Thus, it can be stated that the selected method for hysteresis modelling is suitable for precision positioning systems having deformable elements and controlled employing piezoelectric actuators to model hysteresis.
Straipsnyje nagrinėjamas pozicionavimo sistemos su lanksčiaisiais elementais, kurių judesiui perduoti naudojami pjezoelektriniai vykdikliai, histerezės reiškinys. Tiriama histerezės įtaka pozicionavimo sistemų tikslumui. Tyrimams atlikti naudotas specialus tyrimų stendas ir sudaryta eksperimentinių tyrimų metodika. Tyrimų stendą sudaro: kompiuteris pjezovaldiklis, indukcinis poslinkio jutiklis, duomenims rinkti ir perduoti į programinį paketą naudojamas dinaminis duomenų rinktuvas. Atliktas histerezės matematinis modeliavimas taikant Matlab/Simulink programinį paketą. Tyrimais nustatyta, kad histerezės modelio maksimali sklaidos paklaida, palyginti su eksperimentiniais rezultatais, yra mažesnė nei 5 %, todėl galima teigti, kad pasirinktas histerezės modeliavimo būdas yra tinkamas precizinių pozicionavimo sistemų, turinčių lanksčiuosius elementus, valdomus pjezoelektriniais vykdikliais, histerezei modeliuoti.
RESEARCH OF TECHNOLOGICAL CHARACTERISTICS OF DISPERSED MOLDING MATERIALS / DISPERSINIŲ FORMAVIMO MEDŽIAGŲ TECHNOLOGINIŲ SAVYBIŲ TYRIMAS
Authors: Kulikov Vitaliy , Kvon Svetlana , Serbakova Elena , Kovaleva Tatyana
Published: March 2015

One of the important problems of science and practice is to increase the productivity of manufacturing products from dispersed materials through the modernization of existing equipment and the introduction of new technological processes. The mathematical models of formation of disperse systems, applied to pressed and heated mixtures, are insufficiently developed so far.. The introduction of new mathematical models of formation of disperse mixtures and method s of manufacture of pressed products will increase the productivity, improve the quality of manufactured products, reduce production costs and increase the competitiveness of the products.
Viena iš svarbių mokslo ir praktikos problemų yra padidinti gaminių iš dispersinių medžiagų gamybos našumą modernizuojant įrangą ir taikant naujus technologinius procesus. Šiuo metu nepakankamai ištobulinti presuojamų ir kaitinamų mišinių dispersinių sistemų formavimosi matematiniai modeliai. Naujų dispersinių mišinių formavimo matematinių modelių ir gamybos metodų įdiegimas leis padidinti presuotų gaminių iš dispersinių formavimo medžiagų gamybos našumą, pagerinti gaminamos produkcijos kokybę, sumažinti gamybos išlaidas ir padidinti produkcijos konkurencingumą.
RESEARCH ON LASER MICRO POLISHING OF SLS TECHNOLOGY SINTERED IRON-BASED POWDER SURFACE / SELEKTYVIUOJU LAZERINIO SUKEPINIMO BŪDU SUKEPINTŲ GELEŽIES PAGRINDO MILTELIŲ PAVIRŠIAUS LAZERINIO MIKROAPDIRBIMO TYRIMAI
Authors: Vaitkūnaitė Gerda , Markovič Vladislav , Černašėjus Olegas
Published: March 2015

The article analyzes laser micro polishing of 1.2083 steel samples produced applying selective laser sintering (SLS) method. The study has evaluated the distribution of the shape, size and temperature of the laser beam treated area in the surface layer of sintered and laser polished samples. Experimental tests have shown the impact of the technical parameters of laser micro polishing on the width and hardness of the impact zone of the treated sample. The microstructure analysis of laser treated and untreated areas of the material has been made.
Straipsnyje nagrinėjamas selektyviuoju lazerinio sukepinimo (SLS) būdu pagamintų plieno 1.2083 bandinių mikroapdirbimas lazerio pluoštu. Tyrimo metu įvertinta sukepintų ir lazeriu apdorotų bandinių poveikio zonos forma ir dydis bei temperatūros pasiskirstymas paviršiniame sluoksnyje. Eksperimentinių bandymų metu nustatyta lazerinio mikroapdirbimo technologinių parametrų įtaka apdoroto bandinio poveikio zonos pločiui ir kietumui. Buvo atlikta bandinių lazerio pluoštu paveiktų ir neapdorotų medžiagos zonų mikrostruktūros analizė.
RESEARCH ON THE RECTILINEAR MOTION SYSTEM OF THE GANTRY MODULE / TILTINIO MODULIO TIESIAEIGIŠKUMO PALAIKYMO SISTEMOS TYRIMAS
Authors: Burbaitė Neringa , Viselga Gintas , Jasinskas Algirdas
Published: March 2015

The paper submits experimental researches into guidance on the shuttle gantry module. The article has determined the influence of the roughness intensity of soil surface on the accuracy of guidance on the shuttle gantry module. The gantry module worked in automatic mode. A laser beam generator emitting a vertical beam has been placed at the end of the experimental field. A laser beam catcher equipped with photo diodes has been mounted onto the replaceable support of the positioned gantry module. Chassis deviations have been determined in two ways: when a laser beam trap with equipped a photodiode and the positioning have been mounted on the left chassis and when the laser beam equipped with a photodiode trap has been mounted in the middle of the beam, and the positioning wheel has been left on the left chassis. The conducted researches have shown that the roughness of the soil surface influences the accuracy of guidance. In the first case, deviations of the left chassis evolved from 45 mm to 98 mm, whereas those of the right one - from 38 mm to 150 mm. For determining the accuracy of guidance on the gantry module in the second case, deviations of the left chassis varied from 50 mm to 115 mm while those of the left one from 36 mm up to 120 mm.
Šiame darbe pateikiami šaudyklinio tiltinio modulio (ŠTM) tiesiaeigiškumo palaikymo sistemos eksperimentinių tyrimų rezultatai. Ištirta dirvos paviršiaus nelygumų įtaka ŠTM tiesiaeigiškumo tikslumui. ŠTM dirbo automatiniu režimu tiesiaeigiškumą palaikant lazerine įranga. Lazerio spindulių generatorius, skleidžiantis vertikalų spindulių pluoštą modulio kurso link, statomas lauko gale. Lazerio spindulių pluošto gaudytuvas su fotodiodais montuojamas ant modulio stovo. Tiesiaeigiškumas buvo nustatomas dviem būdais: kai lazerio spindulių pluošto gaudytuvas su fotodiodais ir pozicionavimo ratukas buvo sumontuoti ant kairės važiuoklės; kai lazerio spindulių pluošto gaudytuvas su fotodiodais buvo sumontuoti sijos viduryje, o pozicionavimo ratukas paliktas ant kairės važiuoklės. Nustatyta, kad dirvos paviršiaus nelygumai turi įtakos ŠTM tiesiaeigiškumui. Nustatant pirmuoju būdu kairiosios važiuoklės nuokrypiai kito nuo 45 mm iki 98 mm, o dešiniosios nuo 38 mm iki 150 mm. Nustatant tiltinio modulio tiesiaeigiškumą antruoju būdu kairiosios važiuoklės nuokrypiai kito nuo 50 mm iki 115 mm, o dešiniosios – nuo 36 mm iki 120 mm.
Interleukin-21 Inhibits HBV Replication in vitro
Authors: Li Hai-Jun , Kang Fu-Biao , Li Bao-Sheng , Yang Xin-Ying , Zhang Yin-Ge , Sun Dian-Xing
Published: March 2015

Background

Cytokines are crucial factors in the non-cytolytic antiviral process to inhibit HBV gene expression and replication. Interleukin (IL)-21 has been suggested to play an important role in HBV infection, but it remains unknown whether IL-21 can inhibit HBV replication or how it inhibits HBV replication.

Methods

In this study, we investigated the influence of IL-21 on HBV replication based on human hepatoma Huh7.93 cells co-cultured with human peripheral blood mononuclear cells (PBMCs) and the possible correlation among IL-21, interferon-γ, tumour necrosis factor-α and IL-10.

Results

We demonstrated that the decrease of IL-21 expression and the increase of IL-10 expression in PBMCs could promote HBV replication in vitro. We further revealed that IL-21 is not only able to effectively suppress HBV replication directly but also reduce HBV replication by inhibition of IL-10 secretion.

Conclusions

Our results provide important evidence for the non-cytolytic antiviral mechanism mediated by cytokines and their interactions in chronic hepatitis B.
Takayasu Arteritis in Southern Sweden
Authors: Mohammad Aladdin J. , Mandl Thomas
Published: March 2015

Objective.

To study the epidemiology and clinical characteristics of Takayasu arteritis (TA) in southern Sweden.

Methods.

The study area is situated in Skåne, the southernmost county in Sweden (total population December 2011: 983,419, 50.5% women). Patients were identified using clinical registries in all the 5 hospitals and private rheumatology clinics within the study area between the years 1997 and 2011. The diagnosis of TA was confirmed by medical records review. Only patients fulfilling the 1990 American College of Rheumatology classification criteria were included.

Results.

Thirteen patients (all women) were identified. The median age at diagnosis was 23 years [interquartile range (IQR) 16–38]. Ten patients were diagnosed between 1997 and 2011. The annual incidence rate was estimated to 0.7/million inhabitants (95% CI 0.3–1.2) and 1.5/million among women (95% CI 0.6–2.4). Patients were followed for a median of 9 years (IQR 4–17.5). As of January 1, 2012, all 13 patients were alive and living within the study area. The point prevalence per million inhabitants was 13.2 (95% CI 6.0–20.4), and 26.2 among women (95% CI 11.9–40.4). Subclavian arteries were the most commonly affected vessels. Organ damage was common, affecting all patients. Seven pregnancies resulting in 5 live births and 2 abortions were registered after the diagnosis of TA.

Conclusion.

The incidence of TA in Sweden is comparable to recently reported rates from other European studies, while the prevalence is higher than previously reported. The prognosis of TA is good, but the rate of damage is high.
La teoría conspirativa antisemita en España y Portugal a fines del siglo XVI y los orígenes de la Carta de los judíos de Constantinopla: nueva evidencia
Authors: Soyer Francois
Published: March 2015

Este artículo examina un documento en gran parte desconocido y conservado en los archivos del Instituto Valencia de Don Juan en Madrid. Este documento –un breve memorial escrito por el obispo portugués Andrés de Noronha en la década de 1580 y probablemente destinado a uno de los secretarios reales o tal vez el propio Felipe II– revela nueva información acerca de la creencia de que los judíos o conversos judaizantes en la Península Ibérica comunicaban con sus correligionarios en el Imperio otomano y conspiraban con el objetivo de infiltrar la sociedad cristiana y destruir a las monarquías ibéricas. Dando un informe de una conversación entre el obispo y un inquisidor español que habría tenido lugar en 1566 o 1567, el memorial se refiere a la Carta de los judíos de Constantinopla, una infame falsificación que se convirtió en la piedra angular de esta poderosa teoría conspirativa antisemita. A través de un análisis del texto, este artículo aclara el modo en que la Carta de los judíos de Constantinopla circuló y fue diseminada, tanto en España como en Portugal, así como su papel en la creación en 1568 de becas discriminatorias reservadas para cristianos viejos que deseaban estudiar medicina en la Universidad de Coimbra.
El «Padrón» y la «Manta» de Tudela Documentos acerca de los judeoconversos y la Inquisición en Navarra
Authors: Pérez Ochoa Iñigo
Published: March 2015

Los historiadores de los judíos y convertidos navarros citan reiteradamente un documento que contiene una nómina completa o «padrón», compuesta por los cabezas de familia judíos bautizados en 1498, que en 1510 pactaron el pago de un tributo a la Corona con objeto de garantizar su inmunidad ante la actuación inquisitorial. De manera errónea se ha denominado a tal nómina «manta de los judíos», por confusión con un gran lienzo o sambenito colgado en la iglesia colegial de Tudela que reproducía los sambenitos que se habían visto obligados a portar los condenados por la Inquisición. Ambos documentos, nómina y «manta», fueron utilizados como prueba en los procesos de limpieza de sangre ante los tribunales reales de Navarra durante el siglo XVII. Este artículo desentraña esta confusión, presenta los datos conocidos sobre la «manta» que colgaba en Tudela, describe las copias conservadas del «padrón», y analiza el origen y posterior uso de los documentos
Interaction between Time Dependent Exposure Strategies and Part Positioning within Selective Laser Melting Process of Plastics
Authors: Drexler Maximilian , Drummer Dietmar , Wudy Katrin
Published: March 2015

The selective laser melting of polymer powder is, for rapid prototyping applications, a well-established technology, although a lack in basic process knowledge occurs. Considering demands of series production the selective laser melting technique of polymers is faced with various challenges concerning processable material systems, process strategies and part properties. Consequently, basic research is necessary to understand and optimize processes to shift from rapid prototyping to rapid manufacturing of small lot sized series. Based on basic research the high potential of selective laser melting for the production of complex parts without any tools can be opened up. For the derivation of part quality increasing process strategies, knowledge about interactions between sub-processes of selective laser melting and resulting part properties is necessary. The selective laser melting of polymers consists of three major sub-processes: Powder coating, energy input, material consolidation. According to the interaction of sub-processes, resulting temperature fields during the selective laser melting process determine the part properties by changing micro structural pore number and distribution. Beneath absolute temperatures the time-dependency of the thermal fields also influences the porosity of molten parts. Present process strategies tend to decrease building time by increasing scanning speed and laser power. Although the absolute energy input into the material is constant for increasing scanning speed and laser power in the same ratio, time dependent material effects are neglected. The heating rate is a combined parameter derived from absolute temperature and time. Within the paper the authors analyze the basic interactions between different heating rates and part properties (e. g. mechanical strengths). Furthermore, the part positioning is taken into account. Due to the part positioning within the building chamber different shapes of cross sections appear even for equal part geometries. The authors estimate an interaction between exposed cross section and applied speed of energy input, due to heat accumulating effects. Therefore specimens produced with different heating rates are analyzed with imaging technologies as well as mechanical tests. Based on the done basic investigations new heating rate dependent process strategies can be established considering time dependent material behavior.
Elastoplastic Analysis and Optimization Design for the Tube Channel End of Screw Lock Closure Type Heat Exchanger
Authors: Chen Ping , Zhou Shu Min , Xu Xue Qian
Published: March 2015

With the usage of the FEM software ANSYS, an axisymmetric model for the tube channel end of a screw lock closure type heat exchanger was built. The elastic and elastoplastic stress analyses were carried out. The variations of the stress distribution at the root of threads and the contact pressure on threads engaged surfaces were invesgated. Furthemore, an optimization design based on the elastic model for this type heat exchanger was also conducted in order to obtain reasonable structure dimensions and make full use of materials.
Design and Simulation Analysis of Ultrasonic Rolling Horn
Authors: Liu Le Ping , Peng Yu An , Yan Ya Jun , Gao Qun Qun
Published: March 2015

Considering its important influence on ultrasonic burnishing, ultrasonic horn is the research object in this paper. Take theoretical design of it firstly, then build 3d model by ANSYS11.0 and carry out modal analysis and harmonic response analysis of it. The results show that the longitudinal vibration frequency and the amplitude of transducer are similar to the design value. This validates the feasibility of the design and provides a certain experimental basis for the application of horn in ultrasonic rolling process.
Cutting Roof Roadway Parameter Optimization Simulation Analysis
Authors: Shu Yan Min , Liu Yong Li
Published: March 2015

Contrast simulation analysis under different cutting distance between top lane, cut the top lane area stress state, according to different stress state analysis of the optimal cutting top lane spacing, so as to realize the optimization of cutting top lane setting parameters.Results show that due to the inhomogeneity of rock strength, the main roof breaking are mainly shear stress play a role, as a result, the vertical stress of roof fracture need conditions may be much smaller than mine pressure strength limit.Considering cutting top lane for the larger spacing, cutting the top coal lane area of stress concentration degree is higher, easy to cause impact danger, from this aspect to consider cutting the top lane spacing should be small as far as possible, but the spacing is too small and cut the top lane roadway of quantities will increase, at the same time has the potential to cut two top lane of the superposition of stress, high impact and increase the working face danger.
Failure Prediction and Wear State Evaluation of Power Shift Steering Transmission
Authors: Liu Yong , Ma Biao , Yan Yu , Zheng Chang Song
Published: March 2015

Within the vehicle transmission, the friction surfaces of mechanical parts were consecutively worn-out and ultimately up to the degradation failures. For assessing the wear progress effectively, wear particles should be generally monitored by measuring the element concentration through Atomic emission (AE) spectroscopy. Herein, the spectral data sampled from life-cycle test has been processed by both the Principal Component Analysis (PCA) and further Kernel Principal Component Analysis (KPCA). Results show that KPCA acts more effectively in variable-dimensions reduction due to fewer principle components and higher cumulative contributing rate. To detect the threshold point at where the wear-stage upgraded, the Fuzzy C-means clustering algorithm was applied to process the eigenvalues of principle components. Furthermore, it is demonstrated that the principle components relate to the worn-out state of friction pairs or transmission parts. In general, the introduction of KPCA has contributed to assess the wear-stage at where the machine situates and the accurate worn-out state of various transmission parts.
Finite Element Analysis of Automobile Drive Axle Housing Based on ANSYS
Authors: Li Hai Bin
Published: March 2015

The performance of automobile drive axle housing structure affects whether the automobile design is successful or not. In this paper, the author built the FEA model of a automobile drive axle housing with shell elements by ANSYS. In order to building the optimization model of the automobile drive axle housing, the author studied the static and dynamic performance of it’s structure based on the model.
Machining Simulation for Centrifugal Impeller Based on Modelling of Five-Axis Machining Center
Authors: Zheng Gang , Ruan Sheng , Wu Yan , Lv Bo Xin
Published: March 2015

Machining simulation is an important procedure to ensure machining safety and efficiency, especially for five-axis machining. The modelling for Fidia HS664RT five-axis machining center is firt established, and then the tool path for five-axis machining of centrifugal impeller is generated based on NX. The machining simulation is then implimented based on Vericut, and finally the actual machining is realized on Fidia HS664RT five-axis machining center. The machining results indicate the validity of the proposed machining simulation method.
Numerical Simulation of the Influence of Gear Rotation Speed on the Gear Pump Flow Field
Authors: Hong Wei Bo , Zhang Ke Ping , Yao Ya Ping
Published: March 2015

Gear pump has simple structure, long service life, strong self-priming capacity, high working reliability and other characteristics, which is widely used in various kinds of mechanical equipment. In order to study the influence of gear rotational speed on the internal fluid flow field change rule, the computational fluid dynamics software Fluent was used to simulate the gear pump flow field, while dynamic grid technique was carried on the numerical simulation of the gear pump under different rotation speed, and flow field characteristics were analysed. The results showed that with the increase of gear rotation speed, the area of pump fluid velocity mutation decreased, the area of pressure mutation reduced, and the larger volume of fluid closed to balance.
Registration Algorithm for Three-Dimensional Point Cloud Data
Authors: Huang Li Lun , Li Wen Guo , Yang Qi Le , Chen Ying Chun
Published: March 2015

The principle of registration of the 3D point cloud data and the current algorithms are compared, and ICP algorithm is chosen since its fast convergence speed, high precision, and simple objective function. On the basis of ICP algorithm, singular value decomposition and four-array method are analysed by programming program, and all the mathematical algorithms is transformed into programming language by Matlab software.
Research on the Optimization of Spring System Based on Virtual Prototyping
Authors: Liang Hui Min , Yu Hai Dan , Yu Hao , An Shu Xian , Zhao Han
Published: March 2015

The energy of DC arc influences the electrical life and reliability of relay’s contacts seriously. The study on shortening the arc duration by increasing the breaking velocity of contacts is important for reducing the contacts erosion and improving the contacts life. Firstly, it was indicated that increasing the breaking velocity is effective for reducing the arc time of this differential electromagnetic relay through life test, especially the breaking velocity of N.O. contacts. Then a new optimal model of spring system suitable for this relay was analyzed in increasing the breaking velocity. Secondly, electromagnetic model, mechanical model, dynamic simulation model, vibration model and thermal model of the optimal relay were built based on virtual prototyping. Finally, the optimal design was verified on the virtual prototyping platform and the results shows that the breaking velocity of N.O. contacts increases more than 100%, which provides the optimal scheme of improving the relay’s electrical life.
Designing Requirement of Spring and MR Damper for New Type Baby Car Seat
Authors: Cho Chang Hyun , Choi Seung Bok
Published: March 2015

In modern society, a plenty of car accident is occurred and a lot of people get injury every day. For this reason, the importance of car safety has been increased and car safety has been extensively studied. Especially in many countries, the law about using baby safety seat is legislated to protect babies and children from accident. Thus, recently numerous products for baby safety have been developed. In this paper, a new type baby car seat is proposed to protect babies and children from frontal accident. In order to achieve this goal, design requirements of spring and MR(Magnetorheological) Damper which are main elements for a new type baby car seat are investigated.
Research and Development of Machine Vision Detection System for Transparent Paper Package
Authors: Li Zhe Kun , Cai Pei Liang , He Wei , Wang Sheng Zhi , Li Wen Yuan , Chen Ling , Li Yun Xia
Published: March 2015

This paper aimed at the quality of the transparent paper package, developed a machine vision detection system and successfully applied it in production line. A variety of transparent paper defects are detected out. This system makes the transparent paper packing quality b improved and provides good reference for the application of the technology of machine vision detection.
Early Visualization Detection of Gray Mold (Botrytis) on Eggplant Leaves Based on Multi-Spectral Image
Authors: Yang Yan
Published: March 2015

Gray mold (Botrytis) is a common fungus disease on eggplants,it can reduce the production by 20-30% at worse. Most disease infestations are not evenly distributed across the cultivation area but in patches [1]. The usual method of prevention is spraying fungicide on entire field, which would requires an excessive amount of fungicide and resulting, increases cost of production, pollutes the environment, and improves of resistance fungal strains [2]. In fact, the fungicide can be spray only the area infected which is rather small on the early stage and it is fully capable of controlling disease spread. Therefore, rapid disease detection is the key. The accurate and effective detection method would be helpful for reducing the dosage of fungicide and preventing disease spread.
A close to Real-Time Intelligent System for Enumerating Total Viable Bacteria Based on Pattern Recognition Technology
Authors: Ding Yun , Yin Yong Guang
Published: March 2015

In this paper, a novel close to real-time artificial intelligent system for enumerating Total Viable Bacteria (TVB) in drinking water was developed by using pattern recognition and machine vision technology. In order to identify the viable bacteria accurately, four shape features including circularity ratio, eccentricity, rectangularity, and compact degree, and four color features (GRsd, BRsd, HRsd, SRsd) of the stained viable bacteria image were extracted. An optimal artificial neural network was used as the bacterial recognition classifier, whose inputs were the extracted feature parameters and output was bacteria signal or non-bacteria signal. By using this intelligent system, TVB counts in each sample can be enumerated within 1 h, but the traditional Aerobic Plate Count (APC) method will take us 48 h. The comparative test also indicated that the counting results by two methods are closely correlated (R2=0.9942). This close to real-time accurate information may contribute to melioration and instauration of drinking water safety systems and risk management for TVB.
A Research on the Real-Time 3-D Imaging Technology and Multi-View Control Interface Design for the Attitude Motion Simulator
Authors: Ji Dong , Ji Rui Jie , Wang Hua Pei , Zhang Hai Bo , Tong Xiao Jie
Published: March 2015

In order to have a real-time 3-D imaging of the attitude motion simulator model and to design a multiple views interface in the display and control software of the attitude motion simulator, Firstly, 3D Model of the attitude motion simulator model has been transformed to STL file; Secondly, the functions on the VC++6.0 platform have been written to read the STL file, and 3-D Image display from STL file has been realized by the programming technique of the triangle mesh renderingin OpenGL.Meanwhile, the real-time synchronization has been realized between the 3-D Imageand real angle of attitude motion simulator model.Finally, in order to meet the demands ofcontrol and display software, a multiview control interface in which a real-time data interchange amongthe multiple views is designed.
Segmentation Algorithm of Three-Dimensional Point Cloud Data Based on Region Growing
Authors: Huang Li Lun , Li Wen Guo , Yang Qi Le , Chen Ying Chun
Published: March 2015

Segmentation algorithm of 3D point cloud data based on region growing is proposed, the main idea is as follows: First, seed points in each region of object surface are searched, and then, starts from the seed point, the process of regional growing is done, which all the point cloud data belong to same surface are included until some discontinuous set of points appear. The algorithm is implemented under C, and the 3D point cloud data are showed by OPENGL software.
The Engine Assembly Rules of Each Mode of Vibration Analysis
Authors: Wang Feng Jun
Published: March 2015

In This paper, on the basis of studying on relevant fields, three-dimensional factual model of engine assembly is established with SDRC/Ideas9 software according to the factual characteristic of engine structure. The fix frequency of engine assembly and parameters of main mode are acquired concerning with mode analysis, so that we can understand the rule of vibration. This approach can reduce the level of vibration and noise.
To Research on Damping Performance of Dissipation Structure for Additional Metal Damper
Authors: Jiang Xia Qing
Published: March 2015

This study is the additional metal damper damping performance , trying to make the structure look for useful conclusions acceleration and displacement reaction of reduced to a single particle system as the research object , the use of process analysis, first establish additional metal damper restoring force model of the structure to determine the parameters and the dependent variable , and finally based on the results of numerical analysis to calculate the acceleration response and the theoretical displacement reaction conditions to reduce the additional metal damper structure , and make the appropriate analysis .
Turbulent Convective Heat Transfer in a Transversely Grooved Tube with Natural Convection Effect
Authors: Shen Xiang Yang , Ding Jing , Lu Jian Feng
Published: March 2015

The turbulent convective heat transfer in a transversely grooved tube of molten salt with natural convection effect has been numerically investigated. In general, the average Nusselt number with and without considering natural convection in transversely grooved tube was almost equal. According to the simulated results, the heat transfer coefficient of transversely grooved tube in upside region was lower than that of downside region. The effect of natural convection on unilateral heat transfer in transversely grooved tube was more obvious with lower Reynolds number and higher inlet temperature, and the effect of natural convection on unilateral heat transfer was lower with bigger groove deep.
Design of Platform for Hydraulic Manipulator Virtual Reality Interactive and Comprehensive Experiment
Authors: Liu Cun Gen , Wang Tao , Zhang Ying , Liu Yuan
Published: March 2015

Platform for hydraulic manipulator virtual reality interactive and comprehensive experiment is a master-slave control of hydraulic manipulator servo control system requirement, considering the research and development of Hydraulic manipulator and being ready for pre-research and development of experimental system. According to the demand, the experimental platform can be replaced quickly by implementing agencies, including linear cylinder and swing cylinder and so on, based on analysis of static characteristics and dynamic characteristics for different composition of electro-hydraulic servo valve; It can also be used to simulate the movement of general six degrees of freedom manipulator, with functions of kinematics analysis and motion precision measurement; using virtual reality technology, through 3D virtual manipulator, it can be real-time dynamic display manipulator in space, and motion parameters of each joint.
Classification number :TP242.6 Document code : A
Energy-Efficient Technology Supply Bulk Materials
Authors: Ishkov Alexander D. , Semernin Dmitri A. , Miloradov Svjatoslav V. , Voronina Irina V.
Published: March 2015

Submission materials are the main manufacturing operation in the industry. It largely determines the quality parameters of products. Mechanization and automation of bulk material supply operation in the process eliminates human error and improves the product quality. This work was aimed at finding technical solutions that the reduction of specific energy consumption and enhance the reliability of the vibrating and pneumatic feeders. The article describes the developed the authors vibratory and pneumatic feeders.
Flow Characteristics of Tip Clearance in Axial Compressor
Authors: Qu Yong Lei , Wan Bo , Pei Xiao Meng
Published: March 2015

Tip clearance of compressor rotor blade is introduced for avoiding friction collision between the moving blade and the casing. Because of the existence of the pressure difference between pressure surfaces and the suction surfaces of the blade, the blending of the leakage flow with the mainstream causes losses, which affects internal flow field and overall performance of the compressor. In this article, numerical analysis software is used to study the multi-condition performance of a six and a half axial flow compressor, for analyzing the impact of leakage flow patterns on compressor.
Reliability and Efficiency Calculation for Drive System of Multi-Bush Roller Ironing Machine
Authors: Wang Wu Guang
Published: March 2015

In this paper, formula for calculating the reliability of single-chain drive system and formula for calculating the reliability and efficiency of drive system of multi-roller ironing machine are presented based on reliability design theory and the theory of mechanical efficiency calculation. The results illustrate that the reliability and efficiency of existing drive system are lower. Therefore, improvement measures are proposed: use high-quality bush roller chain that shall be regularly maintained and changed; the chain drive shall be replaced with gear drive.
Parameters Optimization of PVB Laminated Glass Based on Pedestrian Head Protection
Authors: Yang Na , Zhao Gui Fan , Wang Jian Feng , Wang Da Fang
Published: March 2015

In order to research the influence of the parameters of laminated windshield glass to pedestrian head injuries in vehicle-pedestrian accident, the adaptive response surface method (RSM) was utilized to optimize the key parameters of the laminated glass i.e. the elastic modulus, yield strength, density and the glass thickness, in which the pedestrian head injury criteria (HIC) and glass crack radius were setting as the objective function. A set of glass parameters was obtained which was the most beneficial to the pedestrian protection. The optimization may provide theory basis for the design and research of PVB laminated windshield.
Research on Wind Turbine Airfoils Aerodynamic Performance of Trailing Edge Modification
Authors: Yuan Shang Ke , Zhao Zi Qin
Published: March 2015

The airfoil commonly employed in wind turbines is modified by attaching a Gurney flap with length of 2% chord at its trailing edge and its remodeled form as well,but it showed special aerodynamic characteristics.The software FLUENT are respectively used to carry out numerical computation of aerodynamic performances of above-mentioned three airfoils, so that their aerodynamic characteristics, surface pressure distribution, and streamline around them are obtained for different angles of attack. It is shown by the computation result that the modified airfoils will result in such a strong downwash effect and the pressure distribution on airfoil surface is remarkably altered, the lift coefficient, and meantime the airfoil stalling is greatly postponed,but the airfoil of Gurney flap shown the characteristics of opposite.
Scheme Based on Economic Analysis of Energy Consumption about Lithium-Electric Excavator Hydraulic System
Authors: Ma Yong Zhi , Hua Qing Song , Huang Zhen Yu , Zhang Tie Zhu
Published: March 2015

The Lithium-electric Excavator Hydraulic System (Li-EEHS) is based on economic analysis of energy consumption, and it has changed the excavator counterweight into Lithium-ion Battery in order to replace the engine. A computational analysis which takes the Qingdao heavy industry excavator HW130 as the example demonstrates the accessibility of the scheme. The total efficiency of the excavator has been improved from 7% to 17.1% by the Li-EEHS without energy regeneration, while the cost has been decreased from 750¥/day into 240¥/day. And the cost recovery will take around 3.3 years (about 500,000¥).The article typically analyzes the system scheme and the working features for 4 major Li-EEHS.
The Cutter Head Drive Theoretical Model of a New Multi Dual-Eccentric Axes Tunneling Shield Driven by Hydraulic Cylinders Directly
Authors: Wang Hua Geng
Published: March 2015

Based on work principle analysis of a new multi dual-eccentric axes tunneling shield, the advantages of adapting well to large diameter long distance tunnel and energy saving are showed in detail. Then, the cutter head drive theoretical model driven by a single hydraulic cylinder is analyzed, the expressions of driving force and hydraulic cylinder flow are set up, they all vary with the position changing of the cutter head. On this basis, the multi cylinders drive theoretical model is obtained by superposing the expressions of each cylinder. Subsequently, the relationships between working pressure, system flow and cutter head rotating speed under the working conditions of constant torque, constant flow and constant rotating speed are analyzed. The analysis results show that the working pressure and system flow are fluctuating when the cutter head rotating speed maintains constant, and the cutter head drive system is of constant power, and this is also the actual work condition of the shield. At the same time, each hydraulic cylinder stroke remains determined phase matching relationships. Finally, as the example with five cylinders driving, the matching relationships of the hydraulic cylinder strokes are discussed.
A RFID-Based Security Authentication System Model for Electric Vehicle Charging Station
Authors: Fang Lei , Rao Xue , Li Ling , Li Huan
Published: March 2015

Improving the efficiency of RFID data storage and ensuring communication security is an effective way to improve the efficiency and safety of the identifying and authenticating process between charging stations and electric vehicles. Considering structure of electric vehicle charging station (EVCS) and the components of RFID system, this paper presents a charging station security authentication system model based on lightweight RFID security protocol using hybrid encryption technology. This protocol participates in the computation and storage through a reader-writer, so that it can store more data than other protocols using the same storage, meanwhile keeping lightweight. To enhance security, a hybrid encryption for RFID is proposed, which is based on public key signature encryption algorithm, hash function and symmetric key algorithm. Analysis demonstrates that this system has great calculating storage performance and security. In addition, it has the ability to resist several typical attacks. Moreover, gate circuits needed to achieve such encryption algorithm is far less than the one used in conventional SHA-256 algorithm.
Cogging Force Analysis of Moving Magnet Type Permanent Magnet Synchronous Linear Servo Motor
Authors: Shen Zhi Gang , Wang Qing , Sun Qing Jie , Wu Hong Xing
Published: March 2015

Linear motor eliminates the middle part of mechanical drive train, but because of structural characteristics of itself, must to take effective measures to reduce thrust fluctuations, or direct drive will lost its original meaning. In this paper, firstly research on detent force of moving magnet type permanent magnet synchronous linear servo motor and analyze the principle of generate detent force, secondly analyze the cogging force of moving magnet type permanent magnet synchronous linear motor and obtain the expression of cogging force maximum value, finally propose effective method to reduce detent force.
Simulation Analysis for the Walking Mechanism of the Underground Exploration Robot Based on MATLAB and ADAMS
Authors: Qu Fang , Chen Guo Hui , Ning Shan , Luo Feng Li
Published: March 2015

In recent years, our province occurs gas and coal dust explosion accident of coal industry producing process frequently. After the accident, rescue personnel can’t go down in time, waste precious rescue time, causing more casualties personnel. To solve this problem, try to design walking mechanism of the underground exploration robot with a strong adaptation to the complex terrain, climbing and crossing barrier ability, we use the software of MATLAB and ADAMS to establish the three-dimensional model of walking mechanism and the disaster area scene and inspect the walking mechanism’s traveling smoothness in the complex terrain. Through the simulation results, we can see that walking mechanism of the underground exploration robot has a good ability to adapt to changes of the ground, effectively regulate the relative balance of the main body of walking mechanism, suitable for explore the environmental information in the underground complex terrain.
Size-Sorting and Measurement System of Safety Belt Pin Based on Machine Vision
Authors: Cao Li Gang , Xiang Ming , Feng Hao , Wang Yong Yu
Published: March 2015

To improve measurement accuracy of safety belt pin, the size-sorting system which mainly includes a machine vision subsystem and a driving subsystem, is researched. The machine vision subsystem includes a industry camera, a double telecentric lens and a backlight. Image process steps that have sub-pixel accuracy are presented. The driving subsystem is designed with Atmega128L MCU. The state machine is designed for safety pin control logic. The two sub systems communicate with RS232 serial port. The test shows that the system has a maximum accuracy error of 0.05mm, repeatability error of 0.013mm.