bluuebunny/crossref_metadata_2025 huggingface dataset:
Quantitative phase imaging in common-path cross-referenced holographic microscopy using double-exposure method
Authors: Běhal Jaromír
Published: July 2019

This paper proposes an optimized implementation of the double-exposure method with emphasis on the uniformity and minimization of the residual phase imperfections in cross-referenced holographic microscopy (CRHM). The quantitative phase images are restored from single-shot cross-referenced holograms, which are separated in the Fourier space and processed to eliminate effects caused by imperfections of the optical path and sample background. CRHM is implemented in a microscope configuration supplemented by a Sagnac interference module providing splitting and shearing of the sample and reference waves. Utilization of the averaging process, which enhances precision of quantitative phase image (QPI) reconstruction, applicable in the methods with a replicated field of view is also presented. The high temporal stability of CRHM is verified in calibration measurements and its application potential demonstrated by a quantitative restoration of the phase resolution target and imaging of biological samples including cheek and sperm cells.
High stability of ultra-small and isolated gold nanoparticles in metal–organic framework materials
Authors: Cure Jérémy , Mattson Eric , Cocq Kévin , Assi Hala , Jensen Stephanie , Tan Kui , Catalano Massimo , Yuan Shuai , Wang Hao , Feng Liang , Zhang Peng , Kwon Sunah , Veyan Jean-François , Cabrera Yasiel , Zhang Guoyu , Li Jing , Kim Moon , Zhou Hong-Cai , Chabal Yves J. , Thonhauser Timo
Published: July 2019

Strong stabilization and localization understandings of ultra-small ∼1 nm Au/MOF hybrid materials by hydrogen evolution reaction.
Sensitive electrochemical detection of l-cysteine based on a highly stable Pd@Ti3C2Tx (MXene) nanocomposite modified glassy carbon electrode
Authors: Rasheed P. Abdul , Pandey Ravi P. , Jabbar Khadeeja A. , Ponraj Janarthanan , Mahmoud Khaled A.
Published: July 2019

A sensitive and selective electrochemical sensor is reported for the detection of l-Cys based on a Pd@Ti3C2Tx (MXene) composite modified GCE. The deposition of PtNPs on the MXene has improved the electrochemical stability of the MXene at the applied potential.
A flexible smart membrane consisting of GO composite fibres and upconversion MSNs for microRNA detection
Authors: Gu Tongxu , Ren Zhaohui , Li Xiang , Huang Jie , Han Gaorong
Published: July 2019

We have developed a photoluminescent membrane for microRNA detection, consisting of mesoporous silica nanoparticles (CaF2:Yb/Ho@MSNs) attached, via single stranded DNA probes, to flexible polyurethane fibres coated with graphene oxide (GO).
Photo-induced cubic-to-hexagonal polytype transition in silicon nanowires
Authors: Rodichkina S. P. , Lysenko V. , Belarouci A. , Bezverkhyy I. , Chassagnon R. , Isaiev M. , Nychyporuk T. , Timoshenko V. Yu.
Published: July 2019

Crystalline phase transformation in silicon nanowires from cubic diamond to hexagonal diamond under strong laser excitation, caused by inhomogeneous heating-induced mechanical stresses.
Carbohydrate-functionalized N-heterocyclic carbene Ru(ii) complexes: synthesis, characterization and catalytic transfer hydrogenation activity
Authors: Byrne Joseph P. , Musembi Pauline , Albrecht Martin
Published: July 2019

Triazolylidene NHCs decorated with a carbohydrate wingtip group were complexed to a ruthenium(ii) center. Deprotection of the carbohydrate in the metal complex affords a carbohydrate–NHC hybrid system for use as a transfer hydrogenation catalyst.
Effect of microalgae addition on mineral content, colour and mechanical properties of breadsticks
Authors: Uribe-Wandurraga Zaida Natalia , Igual Marta , García-Segovia Purificación , Martínez-Monzó Javier
Published: July 2019

The addition of microalgae in breadsticks produces an increase in iron and selenium content.
Zwitterionic amphiphiles: their aggregation behavior and applications
Authors: Wu Aoli , Gao Yanan , Zheng Liqiang
Published: July 2019

The special structure and properties of zwitterionic amphiphiles endow them potential applications in well-defined assembly structure, target ion conduction, noble metal nanomaterial and antifouling biomaterial preparation.
Vanadium(v) complexes of mandelic acid
Authors: Zechel Filip , Schwendt Peter , Gyepes Róbert , Šimunek Ján , Tatiersky Jozef , Krivosudský Lukáš
Published: July 2019

Di- and trinuclear complexes of vanadium(v) and mandelic acid were prepared revealing surprising geometry of the trinuclear species.
A polarized nonlinear optical response in a topological insulator Bi2Se3–Au nanoantenna hybrid-structure for all-optical switching
Authors: Miao Runlin , Hu Yuze , Ouyang Hao , Tang Yuxiang , Zhang Chenxi , You Jie , Zheng Xin , Xu Zhongjie , Cheng Xiang'ai , Jiang Tian
Published: July 2019

The plasmon-mediated polarized nonlinear optical response and all-optical switching in topological insulator Bi2Se3–Au nanoantenna hybrids are studied.
Enhanced polarization from flexible hierarchical MnO2arrays on cotton cloth with excellent microwave absorption
Authors: Li Xiao , Wang Lei , You Wenbin , Xing Linshen , Yang Liting , Yu Xuefeng , Zhang Jie , Li Yuesheng , Che Renchao
Published: July 2019

Well-designed CC@MnO2(α phase instead of δ phase) exhibits the best absorption performance (−53.2 dB).
Probing ballistic thermal conduction in segmented silicon nanowires
Authors: Anufriev Roman , Gluchko Sergei , Volz Sebastian , Nomura Masahiro
Published: July 2019

We experimentally demonstrate length and temperature limits of ballistic thermal conduction in silicon nanowires.
Achiral isomers controlled circularly polarized luminescence in supramolecular hydrogels
Authors: Yang Li , Wang Fang , Auphedeous Dang-i Y. , Feng Chuanliang
Published: July 2019

Naphthylamine isomers co-assembly with a C2-symmetric chiral hydrogelator showed inversion of supramolecular chirality and CPL via chirality transfer.
Selective hydrodeoxygenation of p-cresol as a model for coal tar distillate on Ni–M/SiO2 (M = Ce, Co, Sn, Fe) bimetallic catalysts
Authors: Pan Liuyi , He Yulong , Niu Menglong , Dan Yong , Li Wenhong
Published: July 2019

Ni–M/SiO2 with different binary metals M (M = Ce, Co, Sn, Fe) prepared by an incipient impregnation method was used in the hydrodeoxygenation (HDO) of p-cresol as model of phenols in coal tar to produce BTX.
Preparation of a poly(acrylic acid) based hydrogel with fast adsorption rate and high adsorption capacity for the removal of cationic dyes
Authors: Yuan Zhenyu , Wang Jie , Wang Yiming , Liu Qian , Zhong Yujie , Wang Yu , Li Li , Lincoln Stephen F. , Guo Xuhong
Published: July 2019

A biocompatible Dex-MA/PAA hydrogel was prepared through copolymerization of glycidyl methacrylate substituted dextran (Dex-MA) with acrylic acid (AA), which was applied as the adsorbent to remove cationic dyes from aqueous solutions.
B(C6F5)3-catalyzed dehydrogenative cyclization of N-tosylhydrazones and anilines via a Lewis adduct: a combined experimental and computational investigation
Authors: Guru Murali Mohan , De Sriman , Dutta Sayan , Koley Debasis , Maji Biplab
Published: July 2019

Metal-free acceptorless-dehydrogenative cyclization of N-tosylhydrazones and aromatic amines produces both symmetrical and unsymmetrical 1,2,4-triazoles in high yields and selectivities.
On the blistering of thermo-sensitive hydrogel: the volume phase transition and mechanical instability
Authors: Shen Tong , Kan Jian , Benet Eduard , Vernerey Franck J.
Published: July 2019

This paper explores the physical mechanisms responsible for the appearance of small blisters on the surface of temperature sensitive hydrogels as they deswell rapidly during their volume phase transition.
Influence of fluorination on CO2adsorption in materials derived from fluorinated covalent triazine framework precursors
Authors: Yang Zhenzhen , Wang Song , Zhang Zihao , Guo Wei , Jie Kecheng , Hashim Mohamed I. , Miljanić Ognjen Š. , Jiang De-en , Popovs Ilja , Dai Sheng
Published: July 2019

Give me more fluorines: introduction of fluorine in the structure of Covalent Triazine Frameworks can improve their CO2adsorption. Materials with optimal fluorine content and narrow nanopore distribution are promising CO2scavengers.
High yield electrochemical exfoliation synthesis of tin selenide quantum dots for high-performance lithium-ion batteries
Authors: Li Jing , Liu Wei , Chen Cheng , Zhao Xiaoxu , Qiu Zhizhan , Xu Haomin , Sheng Feng , Hu Qifeng , Zheng Yi , Lin Ming , Pennycook Stephen J. , Su Chenliang , Lu Jiong
Published: July 2019

We report cathodic exfoliation of bulk SnSe for a high yield (>90%) synthesis of sub-5 nm scale SnSe quantum dots.
Significantly improved Li-ion diffusion kinetics and reversibility of Li2O in a MoO2 anode: the effects of oxygen vacancy-induced local charge distribution and metal catalysis on lithium storage
Authors: Meng Tao , Qin Jinwen , Yang Zhen , Zheng Lirong , Cao Minhua
Published: July 2019

The effects of oxygen vacancy-induced charge distribution and metal catalysis improve the Li-ion diffusion and reversibility of Li2O in MoO2.
Synthesis of boron imidazolate frameworks with cobalt clusters for efficient visible-light driven CO2 reduction
Authors: Hong Qin-Long , Zhang Hai-Xia , Zhang Jian
Published: July 2019

A porous crystalline boron imidazolate framework, with a high density of trinuclear cobalt clusters, exhibits efficient photocatalytic performance for CO2 reduction with a CO evolution rate of 5830 μmol g−1 h−1 under visible-light irradiation.
Disassembling the complexity of mucus barriers to develop a fast screening tool for early drug discovery
Authors: Pacheco Daniela Peneda , Butnarasu Cosmin Stefan , Briatico Vangosa Francesco , Pastorino Laura , Visai Livia , Visentin Sonja , Petrini Paola
Published: July 2019

Mucus is a natural barrier with a protective role that hinders drug diffusion, representing a steric and interactive barrier to overcome for an effective drug delivery to target sites.
The p–n transformation and thermoelectric property optimization of Cu1+xFeSe2 (x = 0–0.05) alloys
Authors: Zhai Jinze , Wang Hongchao , Su Wenbin , Wang Teng , Mehmood Fahad , Wang Xue , Chen Tingting , Huo Taichang , Zhang Kaiqi , Wang Chunlei
Published: July 2019

CuFeSe2 alloys, containing earth-abundant and eco-friendly elements, are considered as environmentally friendly thermoelectric materials.
Inhibition of breast cancer cells by targeting E2F-1 gene and expressing IL15 oncolytic adenovirus
Authors: Yan Yang , Xu Hu , Wang Jiandong , Wu Xin , Wen Wei , Liang Yan , Wang Lingdi , Liu Fengyuan , Du Xiaohui
Published: July 2019

The wide application of oncolytic adenovirus presents a novel therapeutic strategy for breast cancer gene therapy. Application of adenovirus alone achieves little curative effects on breast cancer. In addition, it is worth exploring the synergistic anti-tumor effect by inserting immunomodulatory factor in oncolytic adenovirus genome. By taking the advantage of the highly proliferative property of breast cancer, a novel recombinant adenovirus which could selectively kill tumor cells is established under an E2F-1 promoter. Also by carrying human Interleukin-15 (IL-15) gene, the oncolytic adenovirus exhibits an immunomodulatory effect. The present study proved that the novel oncolytic virus (SG400-E2F/IL-15) exhibits an enhanced anti-tumor activity both in vitro and in vivo, representing an experimental basis for breast cancer “virus-gene” therapy.
Storing memories: the distinct phases of Polycomb-mediated silencing of Arabidopsis FLC
Authors: Costa Silvia , Dean Caroline
Published: July 2019

Polycomb-mediated epigenetic silencing is central to correct growth and development in higher eukaryotes. The evolutionarily conserved Polycomb repressive complex 2 (PRC2) transcriptionally silences target genes through a mechanism requiring the histone modification H3K27me3. However, we still do not fully understand what defines Polycomb targets, how their expression state is switched from epigenetically ON to OFF and how silencing is subsequently maintained through many cell divisions. An excellent system in which to dissect the sequence of events underlying an epigenetic switch is the Arabidopsis FLC locus. Exposure to cold temperatures progressively induces a PRC2-dependent switch in an increasing proportion of cells, through a mechanism that is driven by the local chromatin environment. Temporally distinct phases of this silencing mechanism have been identified. First, the locus is transcriptionally silenced in a process involving cold-induced antisense transcripts; second, nucleation at the first exon/intron boundary of a Polycomb complex containing cold-induced accessory proteins induces a metastable epigenetically silenced state; third, a Polycomb complex with a distinct composition spreads across the locus in a process requiring DNA replication to deliver long-term epigenetic silencing. Detailed understanding from this system is likely to provide mechanistic insights important for epigenetic silencing in eukaryotes generally.
HEG1 indicates poor prognosis and promotes hepatocellular carcinoma invasion, metastasis, and EMT by activating Wnt/β-catenin signaling
Authors: Zhao Yan-rong , Wang Ji-long , Xu Cong , Li Yi-ming , Sun Bo , Yang Lian-yue
Published: July 2019

Heart development protein with EGF-like domains 1 (HEG1) plays critical roles in embryo development and angiogenesis, which are closely related to tumor progression. However, the role of HEG1 in hepatocellular carcinoma (HCC) remains unknown. In the present study, we explored the clinical significance, biological function and regulatory mechanisms of HEG1 in HCC and found that HEG1 is significantly up-regulated in HCC cell lines and primary tumor samples. Additionally, high HEG1 expression is correlated with aggressive clinicopathological features. Patients with high HEG1 expression had shorter overall survival (OS) and disease-free survival (DFS) than those with low HEG1 expression, which indicated that HEG1 is an independent factor for poor prognosis. Lentivirus-mediated HEG1 overexpression significantly promotes HCC cell migration, invasion and epithelial–mesenchymal transition (EMT) in vitro and promotes intrahepatic metastasis, lung metastasis and EMT in vivo. Opposing results are observed when HEG1 is silenced. Mechanistically, HEG1 promotes β-catenin expression and maintains its stability, leading to intracellular β-catenin accumulation, β-catenin nuclear translocation and Wnt signaling activation. Loss- and gain-of-function assays further confirmed that β-catenin is essential for HEG1-mediated promotion of HCC invasion, metastasis and EMT. In conclusion, HEG1 indicates poor prognosis; plays important roles in HCC invasion, metastasis and EMT by activating Wnt/β-catenin signaling; and can serve as a potentially valuable prognostic biomarker and therapeutic target for HCC.
CircRNA-104718 acts as competing endogenous RNA and promotes hepatocellular carcinoma progression through microRNA-218-5p/TXNDC5 signaling pathway
Authors: Yu Jiaze , Yang Minjie , Zhou Bo , Luo Jianjun , Zhang Zihan , Zhang Wen , Yan Zhiping
Published: July 2019

Accumulating evidences indicate that circular RNAs (circRNAs) play a vital role in diverse cancer biology. However, the contributions of circRNAs to hepatocellular carcinoma (HCC) and their underlying mechanism remain largely unknown. The present study aims at investigating the role of circRNA-104718 in HCC progression, which has been observed to be significantly up-regulated in HCC tissues. We found that, higher expression of circRNA-104718 also leds to a poor prognosis in HCC patients. Using luciferase binding assays and RNA immunoprecipitation studies, we identified circRNA-104718 is physically associated and co-expressed with microRNA (miR)-218-5p in HCC. Mechanistically, we demonstrated that circRNA-104718 functions as a competing endogenous RNAs (ceRNAs) and competes with thioredoxin domain-containing protein 5 (TXNDC5) mRNA and directly binds to miR-218-5p. Functionally, we found that ectopically expressed circRNA-104718 accelerated cell proliferation, migration, invasion, and inhibited apoptosis. In vivo studies on a nude mice model showed that circRNA-104718 overexpression could increase the tumor size and the rate of metastasis. Silencing of circRNA-104718 could decrease both the tumor size and metastasis significantly. Conversely, we also observed overexpression of miR-218-5p could in turn decrease the proliferation, migration, invasion, and increase apoptosis. Furthermore, circRNA-104718 could relieve the suppression of miR-218-5p target TXNDC5 and thereby cause an inhibition of miR’s functions. In summary, our results indicate that circRNA-104718 acts as a ceRNA and promotes HCC progression through the targeting of miR-218-5p/TXNDC5 signaling pathway. Thus, we propose that circRNA-104718 would be a promising target for HCC diagnosis and therapy.
Robust alternating optimisation for extrinsic calibration of RGB‐D cameras
Authors: Jang J.W. , Kwon Y.C. , Hwang W. , Choi O.
Published: July 2019

RGB‐depth (RGB‐D) cameras are widely used for 3D reconstruction or human–computer interaction. To simultaneously acquire colour and depth images of an object in widely separated viewpoints, multiple RGB‐D cameras are required. To fuse the colour and depth information of individual RGB‐D cameras in the reference frame, the RGB‐D cameras need to be fully calibrated. Among many steps of extrinsic calibration between different RGB‐D cameras, bundle adjustment has been either slow or error‐prone in the presence of false correspondences across the views. This Letter presents an accurate and efficient bundle adjustment method based on alternating optimisation of a robust cost function. Through experiments, the authors show that the proposed method can dramatically reduce computation time while preserving state‐of‐the‐art accuracy.
Multiple flow‐based knowledge transfer via adversarial networks
Authors: Yeo D. , Bae J.‐H.
Published: July 2019

The authors propose a new knowledge transfer method coupled with a generative adversarial network (GAN) when multiple‐flow‐based knowledge is considered in a teacher–student framework using a residual network (ResNet). In this method, several independent discriminators adapting multilayer‐perceptron‐based structures were designed for flow‐based knowledge transfer. The proposed GAN‐based optimisation alternatively updates the multiple discriminators and a student ResNet such that the flow‐based features of the student ResNet are generated as closely as possible to the real features of a teacher ResNet. The experiments demonstrate that the student ResNet trained using the proposed method more accurately captures the distribution of the flow‐based teacher knowledge than the ‐distance‐based training method. In addition, the proposed method provided better classification accuracy than the existing GAN‐based knowledge transfer method.
Flexible capacitive pressure sensors fabricated by 3D printed mould
Authors: Yu Xuke , Li Yifeng , Yu Huiyang
Published: July 2019

In this Letter, flexible capacitive pressure sensors are developed. Compared to the current mainstream design, the structure is easier to get a large deformation in the dielectric layer and its deformation is more controllable. Since the structure is symmetrical, it deforms uniformly and its Poisson's ratio is near zero when pressure is applied. Besides that, by moderating the structure dimension, sensors with different sensitivity and detection pressure range can be achieved. The fabrication process of these flexible sensors is mainly based on the 3D printing technology, with which the moulds of the sensor are made. The mixture of polydimethylsiloxane and hardening solution is dripped into the printed mould to form the dielectric layer. When it is completely solidified, the dielectric layer is demoulded from the mould. Four moulds with different inner sizes are printed and then four sensors are fabricated and tested. The measurement results show that the capacitance of the sensors increases when the applied pressure increases. The sensor with thinner supporting structure in the dielectric layer has higher sensitivity. The sensor with a thicker supporting structure in the dielectric layer has a larger pressure detection range. All the sensors have low hysteresis error and excellent repeatable performance.
Quantum dash frequency comb laser stabilisation by optical self‐injection provided by an all‐fibre based delay‐controlled passive external cavity
Authors: Weber C. , Batagelj B. , Fiala P. , Auth D. , Dragonja U. , Gaimard Q. , Ramdane A. , Breuer S.
Published: July 2019

The intermode beat frequency stability of a 1 mm long quantum dash self mode‐locked semiconductor laser emitting optical frequency combs centred at 1535 nm is improved by single‐cavity optical self‐injection. A novel all‐fibre based cavity employing a piezo‐stretchable fibre spool provides both macroscopic optical path cavity length of 76 m and microscopic fine‐delay fibre length control. The maximum achieved intermode beat frequency tuning is 2 MHz. The intermode beat frequency line width indicating the optical frequency comb stability is improved from 67 kHz to below 900 Hz constituting an improvement by a factor of 74. An independent free‐space stabilisation experiment and stochastic time‐domain modelling confirm the demonstrated intermode beat frequency tuning range.
Compact four‐port MIMO dielectric resonator antenna with pattern diversity
Authors: Varshney Gaurav , Gotra Shailza , Chaturvedi Saumya , Pandey Vinay S. , Yaduvanshi Rajveer S.
Published: July 2019

A new compact four‐port multi‐input‐multi‐output (MIMO) dielectric resonator (DR) antenna is proposed with pattern diversity. The antenna contains four DR elements, the epsilon‐shaped and cylindrical. These four DR elements are placed together such that they resonate at the same frequency. The specific geometry of the DR elements allows to place them at separation which is much smaller than operating wavelength. Hence, the combination of the four DR elements acts as a single DR. This helps in maintaining the compactness of the antenna structure. The antenna operates with the hybrid of modes and excited in epsilon‐shaped and cylindrical DR elements, respectively. The excitation of these orthogonal modes helps in obtaining the pattern diversity allowing the antenna for multi‐directional coverage. The antenna provides 15.73% overlapping 10 dB impedance bandwidth with the variation of gain within ranges 4–6 and 6–6.5 dBi at port 1/2 and port 3/4, respectively. In addition, the antenna provides the high radiation efficiency >93% at port 1/2 and 97% at port 3/4. Other parameters required for MIMO applications such as envelope correlation coefficient and diversity gain are within the acceptable limits.
Linear magnetic gear with HTS bulks for wave energy conversion
Authors: Liu Chunyuan , Zhu He , Dong Rui
Published: July 2019

This study proposes a linear magnetic gear (LMG). Unlike conventional LMGs, the proposed one purposely uses high‐temperature superconducting (HTS) bulks replace permanent magnets (PMs). The high‐speed mover of the magnetic gear is connected to the secondary of the linear permanent magnet generator (LPMG), which constitutes a direct‐drive wave power system that converts wave energy into electrical energy. First, the LMG structure is presented according to the principle of magnetic field modulation, and the authors briefly analyzed the number of pole pairs of inner, outer, and ferromagnetic modulators. Second, they also established a finite element analysis model to analyze the performance of magnetic gear, including magnetic field distribution, radial air gap magnetic flux density, and force characteristic. An LMG with HTS bulks not only increased the radial air gap magnetic flux density but also improved the speed of LPMG. In conclusion, this experiment verifies the efficacy of direct‐drive wave power take‐off system and effectively converts wave energy into electrical energy.
Research on radar task scheduling with power constraint
Authors: Wang Yong‐Kun , Zheng Shi‐You
Published: July 2019

Aiming at the task‐scheduling problem of phased array radar subject to low probability of intercept (LPI), the radar radiation power constraint and power agility features are analysed. Then, the task‐scheduling model with multi‐constraints of phased array radar is established. Based on the high solving precision and fast convergent rate characteristics of the particle swarm optimization (PSO), a modified discrete PSO (MDPSO) algorithm is proposed to solve the task‐scheduling problem. The proposed method can achieve the task scheduling optimal with the LPI performance guaranteed simultaneously, and agility power between the radar frames decreases effectively. The simulation results illustrate the effectiveness of the proposed method.
Formation of hot Jupiters through disk migration and evolving stellar tides
Authors: Heller René
Published: July 2019

Since the discovery of Jupiter-sized planets in extremely close orbits around Sun-like stars, several mechanisms have been proposed to produce these “hot Jupiters”. Here we address their pile-up at 0.05 AU observed in stellar radial velocity surveys, their long-term orbital stability in the presence of stellar tides, and their occurrence rate of 1.2 ± 0.38% in one framework. We calculate the combined torques on the planet from the stellar dynamical tide and from the protoplanetary disk in the type-II migration regime. The disk is modeled as a 2D nonisothermal viscous disk parameterized to reproduce the minimum-mass solar nebula. We simulate an inner disk cavity at various radial positions near the star and simulate stellar rotation periods according to observations of young star clusters. The planet is on a circular orbit in the disk midplane and in the equatorial plane of the star. We show that the two torques can add up to zero beyond the corotation radius around young, solar-type stars and stop inward migration. Monte Carlo simulations with plausible variations of our nominal parameterization of the star-disk-planet model predict hot-Jupiter survival rates between about 3% (for an α disk viscosity of 10−1) and 15% (for α = 10−3) against consumption by the star. Once the protoplanetary disk has been fully accreted, the surviving hot Jupiters are pushed outward from their tidal migration barrier and pile up at about 0.05 AU, as we demonstrate using a numerical implementation of a stellar dynamical tide model coupled with stellar evolution tracks. Orbital decay is negligible on a one-billion-year timescale due to the contraction of highly dissipative convective envelopes in young Sun-like stars. We find that the higher pile-up efficiency around metal-rich stars can at least partly explain the observed positive correlation between stellar metallicity and hot-Jupiter occurrence rate. Combined with the observed hot-Jupiter occurrence rate, our results for the survival rate imply that ≲8% (α = 10−3) to ≲43% (α = 10−1) of sun-like stars initially encounter an inwardly migrating hot Jupiter. Our scenario reconciles models and observations of young spinning stars with the observed hot-Jupiter pile up and hot-Jupiter occurrence rates.
The gentle monster PDS 456
Authors: Bischetti M. , Piconcelli E. , Feruglio C. , Fiore F. , Carniani S. , Brusa M. , Cicone C. , Vignali C. , Bongiorno A. , Cresci G. , Mainieri V. , Maiolino R. , Marconi A. , Nardini E. , Zappacosta L.
Published: July 2019

We report on the first ALMA observation of the CO(3−2) and rest-frame ∼340 GHz continuum emission in PDS 456, which is the most luminous, radio-quiet QSO in the local Universe (z ≃ 0.18), with a bolometric luminosity LBol ∼ 1047 erg s−1. ALMA angular resolution allowed us to map scales as small as ∼700 pc. The molecular gas reservoir traced by the core of the very bright CO(3−2) emission line is distributed in a compact rotating disk, with a size of ∼1.3 kpc, seen close to face-on (i ∼ 25 deg). Fast CO(3−2) emission in the velocity range v ∈ [ − 1000, 500] km s−1 is also present. Specifically, we detect several blue-shifted clumps out to ∼5 kpc from the nucleus, in addition to a compact (R ≲ 1.2 kpc), broad emission component. These components reveal a galaxy-wide molecular outflow, with a total mass Mmolout ∼ 2.5 × 108 M⊙ (for an αCO = 0.8 M⊙ (K km s−1 pc2)−1) and a mass outflow rate Ṁmol ∼ 290 M⊙ yr−1. The corresponding depletion time is τdep ∼ 8 Myr, shorter than the rate at which the molecular gas is converted into stars, indicating that the detected outflow is potentially able to quench star-formation in the host. The momentum flux of the molecular outflow normalised to the radiative momentum output (i.e. LBol/c) is ≲1, comparable to that of the X-ray ultra-fast outflow (UFO) detected in PDS 456. This is at odds with the expectations for an energy-conserving expansion suggested for most of the large-scale outflows detected in low-luminosity AGNs so far. We suggest three possible scenarios that may explain this observation: (i) in very luminous AGNs such as our target the molecular gas phase is tracing only a fraction of the total outflowing mass; (ii) a small coupling between the shocked gas by the UFO and the host-galaxy interstellar medium (ISM); and (iii) AGN radiation pressure may be playing an important role in driving the outflow.
SPHERE view of the jet and the envelope of RY Tauri
Authors: Garufi A. , Podio L. , Bacciotti F. , Antoniucci S. , Boccaletti A. , Codella C. , Dougados C. , Ménard F. , Mesa D. , Meyer M. , Nisini B. , Schmid H. M. , Stolker T. , Baudino J. L. , Biller B. , Bonavita M. , Bonnefoy M. , Cantalloube F. , Chauvin G. , Cheetham A. , Desidera S. , D’Orazi V. , Feldt M. , Galicher R. , Grandjean A. , Gratton R. , Hagelberg J. , Lagrange A. M. , Langlois M. , Lannier J. , Lazzoni C. , Maire A. L. , Perrot C. , Rickman E. , Schmidt T. , Vigan A. , Zurlo A. , Delboulbé A. , Le Mignant D. , Fantinel D. , Möller-Nilsson O. , Weber L. , Sauvage J.-F.
Published: July 2019

Context.Jets are rarely associated with pre-main sequence intermediate-mass stars. This contrasts with the frequent detection of jets in lower mass or younger stars. Optical and near-IR observations of jet-driving sources are often hindered by the presence of a natal envelope.

Aims.Jets around partly embedded sources are a useful diagnostic to constrain the geometry of the concealed protoplanetary disk. We intend to clarify how the jet-driving mechanisms are affected by both spatial anisotropies and episodic variations at the (sub-)au scale from the star.

Methods.We obtained a rich set of high-contrast VLT/SPHERE observations from 0.6 to 2.2μm of the young intermediate-mass star RY Tau. Given the proximity to the Sun of this source, our images have the highest spatial resolution ever obtained for an atomic jet (down to ~4 au).

Results.Optical observations in polarized light show no sign of the protoplanetary disk detected by ALMA. Instead, we observed a diffuse signal resembling a remnant envelope with an outflow cavity. The jet is detected in the Hα, [S II] at 1.03μm, He Iat 1.08μm, and [Fe II] lines in the 1.25μm and 1.64μm. The jet appears to be wiggling and its radial width increasing with the distance is complementary to the shape of the outflow cavity suggesting a strong interaction with jet and envelope. Through the estimated tangential velocity (~100 km s−1), we revealed a possible connection between the launching time of the jet substructures and the stellar activity of RY Tau.

Conclusions.RY Tau is at an intermediate stage toward the dispersal of the natal envelope. This source shows episodic increases of mass accretion and ejection similarly to other known intermediate-mass stars. The amount of observed jet wiggle is consistent with the presence of a precessing disk warp or misaligned inner disk that would be induced by an unseen planetary or sub-stellar companion at sub- or few-au scales respectively. The high disk mass of RY Tau and of two other jet-driving intermediate-mass stars, HD 163296 and MWC480, suggests that massive, full disks are more efficient at launching prominent jets.
Massive stars in the young cluster VVV CL074
Authors: Martins F. , Chené A.-N. , Bouret J.-C. , Borissova J. , Groh J. , Ramírez Alegría S. , Minniti D.
Published: July 2019

Context. The evolution of massive stars is not fully constrained. Studies of young massive clusters hosting various populations of massive stars can help refine our understanding of the life and fate of massive stars.

Aims. In this context, our goal is to study the massive stellar content of the young massive cluster VVV CL074.

Methods. We obtained K-band spectroscopy of the brightest cluster members in order to identify the massive star population. We also determined the stellar properties of the cluster’s massive stars to better quantify the evolutionary sequences linking different types of massive stars. We collected integral field spectroscopy of selected fields in the cluster VVV CL074 with SINFONI on the ESO/VLT. We performed a spectral classification based on the K-band spectra and comparison to infrared spectral atlases. We determined the stellar parameters of the massive stars from analysis with atmosphere models computed with the code CMFGEN.

Results. We uncover a population of 25 early-type (OB and Wolf–Rayet) stars, 19 being newly discovered by our observations out of which 15 are likely cluster members. The cluster’s spectrophotometric distance is 10.2 ± 1.6 kpc, placing it close to the intersection of the galactic bar and the Norma arm, beyond the galactic center. This makes VVV CL074 one the farthest young massive clusters identified so far. Among the massive stars population, three objects are Wolf–Rayet stars, the remaining are O and B stars. From the Hertzsprung–Russell diagram we find that most stars have an age between 3 and 6 Myr according to the Geneva evolutionary tracks. WN8 and WC8-9 stars are the descendants of stars with initial masses between 40 and 60 M⊙. The massive star population of VVV CL074 is very similar to that of the cluster DBS2003-179 and to a lesser extent to that of the Quintuplet cluster, indicating the same age. The central cluster of the Galaxy is ∼3 Myr older. From the comparison of the massive stars populations in these four clusters, one concludes that galactic stars with an initial mass in the range 40–60 M⊙ likely go through a WN8-9 phase.
Emergency rescue: the perspective and practicability of applying E-Cell electric engineering vehicles
Authors: Jiang Jie , Wu Gang , Chen Wenzhe , Wang Zehao , Jiao Yanan
Published: July 2019

Copying with the increasingly severe energy crisis and air pollution, new energy vehicles will be an inexorable trend in the near future. The E-Cell electric engineering vehicles will replace conventional oil-fired ones gradually. This paper analyses the current situation and tendency of EVs in brief, explains the function of E-Cell electric engineering vehicles and its roles in maintaining grid stability, peak load shifting and 24-hour emergency rescue service for EVs. Concerning technical application, this paper primarily designs vehicle intelligent terminal systems, Battery Management System(BMS), cable charging, wireless charging and self-charging systems. Finally, this paper designs the billing modes of charging process, and accounts for billing process of vehicle intelligent terminal systems by flow chart to ensure the accuracy during charging process.
Assessing the feasibility of applying Reverse Osmosis technology at MN Port
Authors: Hananta Syaifulloh , Santoso
Published: July 2019

This paper aims to assess the feasibility of applying Reverse Osmosis (RO) technology at MN Port. Hydro-oceanography analysis was performed to understand sea conditions in the proximity of MN Port and to determine water intake point. Furthermore, design analysis was also conducted to determine the most suitable RO design to be applied. Based on the hydro-oceanography analysis, the study area is generally shallow water areas with the depth ranges from 2-10 meters, and the type of tide is diurnal tide. The speed and direction of ocean currents range from 0.01-0.06 m/s with the dominant direction trending northeast and north. Based on the port development plan and hydro-oceanography analysis, it is recommended that the water intake point is at the north of the port. The results obtained from several analyses show that RO technology can be applied at MN Port.
The Study on Performance of Drag Based Water Turbine under Non-immersive Condition
Authors: Pei Yiting , Mu Zekun
Published: July 2019

As electricity plays a paramount role in modern life, the electric power outage is always considered to be a serious problem. For this purpose, our research focuses on improving the efficiency of water turbine. By studying the effects of the number and curvature of turbine blades and stimulating water faucet, the water turbine is expected to effectively boost the rotation under non-immersive condition. The goal of the study is to improve the blade design for higher efficiency of the turbine.

This project presents the research of performance on drag based water turbine. The water turbine, whose whole structure is exposed in the air, in the research is an alternative for conventional immersed water turbine. The size of the water turbine is relatively small compared with industry size. Incoming water can be from any direction. The water turbine displays certain advantageous perspectives. Following the past experiments about this device, a myriad of developments has made over years. The blades of drag based water turbine have been tested with numerous combinations and permutations; thus, the effective choices of blade curvature decided in the research are one-quarter of a circle, one-third of a circle and half a circle, with the arc lengths and thicknesses to be the same. Besides, the number of blades in different experiments are 2, 3, 4 respectively. The incoming flow rate is expected to be constant, even though it fluctuates between 5.45 LPM and 5.95 LPM because of limited experiment equipment. Effects of blade number and curvature are examined, and corresponding conclusions are made.
Research on new energy development comprehensive assessment model and application in China
Authors: Hu Jing , Huang Bibin , Du Dan , Wang Dan
Published: July 2019

In order to achieve the target of that non-fossil energy accounted for 15% in 2020 and 20% in 2030, new energy has developed rapidly in recent years in our country. However, the rapid development of new energy has brought many problems, such as the wind power curtailment, photovoltaic power curtailment, the unbalanced development in different regions and the imperfect policy. Therefore, it is necessary to make a comprehensive evaluation of the development of new energy, as the basis for the policy formulation and planning of new energy. In this paper, according to the characteristics of the new energy development in China, a comprehensive assessment model of new energy development is constructed, a set of assessment index system is proposed, which of the quantitative and qualitative combination, including energy production, energy consumption and policy mechanism from, and combining the Analytic Hierarchy Process(AHP) method to determine the weight coefficient. Finally, new energy development in Jiangsu province is taken as an example, the comprehensive evaluation of new energy development situation in 2018 is given.
Fault detection and diagnosis of photovoltaic system using fuzzy logic control
Authors: Zaki Sayed A. , Zhu Honglu , Yao Jianxi
Published: July 2019

Among several renewable energy resources, Solar has great potential to solve the world’s energy problems. With the rapid expansion and installation of PV system worldwide, fault detection and diagnosis has become the most significant issue in order to raise the system efficiency and reduce the maintenance cost as well as repair time. This paper presented a method for monitoring, identifying, and detecting different faults in PV array. This method is built based on comparing the measured electrical parameters with its theoretical parameters in case of normal and faulty conditions of PV array. For this purpose, three ratios of open circuit voltage, current, and voltage are obtained with their associated limits in order to detect eight different faults. Moreover, the fuzzy logic control FLC method is performed for studying the failure configuration and categorizing correctly the different faults occurred. The outcomes obtained by performing the different faults representing permanent and temporary faults demonstrated that the FLC was equipped to precisely identify the faults upon their occurring. Different simulated and experimental tests are conducted to demonstrate the performance of the proposed method.
Optimal dispatch of hybrid energy islanded microgrid considering V2G under TOU tariffs
Authors: Ma Yiwei , Chen Yuyang , Chen Xin , Deng Fuchun , Song Xiantong
Published: July 2019

In order to achieve a prospective economic effect of renewable energy generations and vehicle to grid (V2G), this paper proposes an optimal dispatch method of wind-PV-battery microgrid considering V2G under time-of-use (TOU) tariffs for those isolated communities in remote islands and mountainous areas. A cooperative dispatch strategy and an optimal dispatch model are both presented for the total operation cost minimization and higher utilization of renewable energy generation. Finally, the simulation results show that the proposed method is effective and feasible.
Factors affecting the transition of the Polish power system
Authors: Suwala Wojciech , Wyrwa Artur
Published: July 2019

Energy systems face radical –almost revolutionary changes which, however, will be stretched over the long period. The critical factors influencing the future development of the Polish power sector are discussed in this paper. Development of intermittent energy supplies from renewable energy sources imposes a challenge on the entire power system and requires specific adaptations and responses from traditional generation units. Up to the present time they have been used to work in the stable mode while now they need more operational flexibility. The share of RES constantly increases. On one hand, this has a very positive environmental impact, but on the other it disturbs economics of classical generation units. Also liberalized electricity markets are impacted and the risks in power investments have increased. The capacity market could constitute a remedy, which will incentivise the investments necessary to fill the gap created by closing exhausted and inefficient plants. On the consumer side electromobility could change the demand, not only in quantity but also in terms of load profile. Climate policy tends to detriment coal based generation. For countries abundant in coal resources which make use of this cheap fuel, such as Poland, the question arises about its future role. Even in the most coal-supportive scenarios revised in this paper its relative share in electricity generation does not exceed 50% in 2050 while in others it rather goes much below 30%. .
Integration adsorption chillers with conventional power plant
Authors: Sztekler Karol , Kalawa Wojciech , Stefański Sebastian , Mika Łukasz , Krzywański Jarosław , Grabowska Karolina , Nowak Wojciech
Published: July 2019

According to predictions, electricity consumption in developed countries will increase three times by 2020 compared with 1970. In contrast, in developing countries, where the population may double by 2020 relative to 1970, there may even be a twentyfold increase in electricity consumption [1]. Other sources predict that increases in electricity demand by 2030 will be approx. 2 ÷ 3% a year. With such a high rate of development of the world economy, the electricity demand will be increasing. Thus, using only renewable sources to satisfy the demand for energy is insufficient and will remain so in the near future. Coal will remain the predominant fuel used to produce electricity. One of the ways to reduce the adverse effect of fossil fuels on the natural environment is to increase the efficiency of use of primary energy. Electricity production is associated with large losses, including in the form of heat which can be used to produce cold with adsorption chillers that can be powered by low-temperature heat. The paper presents the possibility to employ adsorption chillers in power units in order to increase the efficiency of electricity production. Simulation calculations were performed using Sim tech’s IPSEPro software.
Testing the performance characteristics of specific profiles for applications in wind turbines
Authors: Pytel Krzysztof , Gumula Stanislaw , Dudek Piotr , Bielik Sebastian , Szpin Szymon , Hudy Wiktor , Piaskowska – Silarska Małgorzata , Kowalski Marcin
Published: July 2019

The publication presents the results of aerodynamic characteristics of selected profile blades for applications in wind turbines. Considering the potential of energy resources and investors’ preferences, the amount of energy produced in wind farms in the total amount of electricity generated will be systematically growing and probably, in the next few years, wind energy will be the first in the field of electricity production from all types of power plants. Harnessing the power of moving air masses is now a global phenomenon. Rotor wheel converts wind energy into mechanical energy when using blades with chosen shape and oriented in the terms of the optimum performance. The aim of the measurements was to determine the impact of blade shape and blade angle of attack on the efficiency of conversion of wind energy into mechanical energy on the rotor wheel. The obtained power coefficients were presented as results.
The operation and capacity fade modelling of the lithium-ion cell for electric vehicles
Authors: Burzyński Damian , Kasprzyk Leszek
Published: July 2019

The paper deals with the issues related to the operation and capacity fade modelling of lithium-ion cells. It includes the presentation of the electrochemical model of the cell in which the phenomenon of diffusion and transfer of charge on electrodes and in electrolyte was discussed. The circuit model of the cell designed for analysis of its behaviour in the conditions of the dynamically variable load was presented. The key aging processes which occur during the operation of the cells were characterised, and their impact on the wear of the cell was discussed. The model of the capacity fade of the lithium-nickel-manganese-cobalt cell was developed. The model parameters depends on the ambient temperature, the value of load current and the value of the average charge current. The results of the model were verified with the laboratory measurement.
ReBaCo2-xMnxO5+δ (Re: rare earth element) layered perovskites for application as cathodes in Solid Oxide Fuel Cells
Authors: Olszewska Anna , Świerczek Konrad
Published: July 2019

Decrease of the operation temperature is considered as one of the most important targets in development of Solid Oxide Fuel Cells (SOFC), as it leads to considerable extension of their long-term operation and makes construction and utilization of the SOFC generators cost-effective. Relatively high value of the activation energy of the oxygen reduction reaction (ORR) occurring at the cathode, and consequently, large cathodic polarization resistance at lower temperatures is a major obstacle hindering usage of SOFCs at decreased temperatures. In this work possibility of application of manganese-doped cobalt-based cation-ordered perovskites as candidate cathode materials in the intermediate temperature (IT, ca. 600-800 °C) range is discussed. The considered oxide materials, depending on chemical composition, i.e. choice of Re element and Mn-doping level exhibit high values of mixed ionic-electronic conductivity, as well as good catalytic activity toward the oxygen reduction and moderate thermal expansion. Cathode layers manufactured on a basis of selected ReBaCo2-xMnxO5+δ oxides show low polarisation resistance.