bluuebunny/crossref_metadata_2025 huggingface dataset:
NK Cells Activated through Antibody-Dependent Cell Cytotoxicity and Armed with Degranulation/IFN-γ Production Suppress Antibody-dependent Enhancement of Dengue Viral Infection
Authors: Sun Peifang , Williams Maya , Nagabhushana Nishith , Jani Vihasi , Defang Gabriel , Morrison Brian J.
Published: February 2019

Antibody (Ab)-dependent enhancement (ADE) is a hypothesized mechanism of increased disease severity during secondary dengue virus (DENV) infection. This study investigates Ab-dependent cell cytotoxicity (ADCC) in counteracting ADE. In our system, DENV and DENV-immune sera were added to peripheral blood mononuclear cells (PBMCs), and ADE and NK cell activation were simultaneously monitored. ADE was detected in monocytes and a concurrent activation of NK cells was observed. Activated NK cells expressed IFN-γ and CD107a. IFN-γ was detected at 24 hours (24 h) followed by a rapid decline; CD107a expression peaked at 48 h and persisted for >7 days. Optimal activation of NK cells required the presence of enhancement serum together with ADE-affected monocytes and soluble factors, suggesting the coexistence of the counteractive ADCC Abs, in the same ADE-serum, capable of strongly promoting NK cell activation. The function of NK cells against ADE was demonstrated using a depletion assay. NK cell-depleted PBMCs had increased ADE as compared to whole PBMCs. Conversely, adding activated NK cells back into the NK-depleted-PBMCs or to purified monocytes decreased ADE. Blocking IFN-γ expression also increased ADE. The study suggests that under ADE conditions, NK cells can be activated by ADCC Abs and can control the magnitude of ADE.
A new application of Trichoderma asperellum as an anopheline larvicide for eco friendly management in medical science
Authors: Podder Dipanjan , Ghosh Swapan Kr.
Published: February 2019

Microfungal applications are increasing daily in the medical science. Several species of Trichoderma are widely used in agricultural fields as biological control and plant growth promoting agents. The application of Trichoderma asperellum as an entomopathogenic fungus against the Anopheles mosquito, a vector of malaria, is a novel control approach. Controlling malaria with eco-friendly management practices is an urgent need. We isolated three T. asperellum from different natural sources using serial dilution and mosquito baiting techniques. The fungi were identified on the basis of phenotypical and molecular characteristics. The fungi were grown in different natural media to examine spore production ability and the fungal spore suspensions were applied to the anopheline larvae to determine their larvicidal activity in vitro. We investigated the efficacy of crude ME (methanolic extract) and different methanolic fractions (MFs) of the fungal extracts against anopheline larvae. Methanolic Fraction 8 (MF8) exhibited the strongest larvicidal activity. A GC-MS analysis of MF8 and a Chemolibrary search were performed to identify the active agents in the fungal extracts. Among the three isolates of T. asperellum, the TaspSKGN2 isolate showed the lowest LD50 (2.68 × 107 conidia/mL) and LT50 values (12.33 h). The crude ME exhibited LD50 values of 0.073 mg/mL and LT50 values of 11.33 h. MF8 showed LD50 values of 0.059 mg/mL and LT50 values of 8.57 h. In GC-MS study of MF8, 49 compounds were found. Among these, seven compounds (2,3-di hydro thiopene, p-cymene, alpha-pinene, hexadecanoic acid, 8-methyl quinoline, (Z,Z)-9,12-octa decadienoic acid, methyl ester, 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-Pyran-4-one-) with high abundance were found to have insecticidal efficacy by a literature survey. We detected a reduction in the phenoloxidase content inside the cuticle and hemolymph of the anopheline larvae after a few hours of interaction with ME (0.073 mg/mL). Thus Trichoderma asperellum has new applications for the control of Anopheles spp. malaria vectors.
Advances in three-dimensional graphene-based materials: configurations, preparation and application in secondary metal (Li, Na, K, Mg, Al)-ion batteries
Authors: Li Guangzhe , Huang Bin , Pan Zhefei , Su Xiangyu , Shao Zongping , An Liang
Published: February 2019

Recent advances in three-dimensional graphene materials for secondary metal-ion battery applications are reviewed.
Food-borne patulin toxicity is related to gut barrier disruption and can be prevented by docosahexaenoic acid and probiotic supplementation
Authors: Zhai Qixiao , Gong Xue , Wang Chen , Zhao Jianxin , Zhang Hao , Tian Fengwei , Chen Wei
Published: February 2019

Patulin toxicity is related to gut barrier disruption and can be prevented by docosahexaenoic acid and probiotic supplementation.
Radiation-assisted metal ion interference tumor therapy by barium peroxide-based nanoparticles
Authors: Zhang Meng , Shen Bo , Song Ruixue , Wang Han , Lv Bin , Meng Xianfu , Liu Yang , Liu Yanyan , Zheng Xiangpeng , Su Weiwei , Zuo Changjing , Bu Wenbo
Published: February 2019

In this paper, we report the ion interference tumor therapy strategy by employing the specific biological effects of Ba2+ ions.
Functionalized nitrogen-doped carbon dot-modified yolk–shell ZnFe2O4 nanospheres with highly efficient light harvesting and superior catalytic activity
Authors: Li Jianan , Li Xinyong , Zeng Libin , Fan Shiying , Zhang Mingmei , Sun Wenbo , Chen Xin , Tadé Moses O. , Liu Shaomin
Published: February 2019

In this work, novel nitrogen-doped carbon dots (NCDs) modified ZnFe2O4 yolk–shell nanostructure photocatalysts have been fabricated for the first time.
MoS2 nanosheet mediated ZnO–g-C3N4 nanocomposite as a peroxidase mimic: catalytic activity and application in the colorimetric determination of Hg(ii)
Authors: Babu Christus A. Anand , Panneerselvam P. , Ravikumar A. , Marieeswaran M. , Sivanesan S.
Published: February 2019

A novel colorimetric sensing platform using the peroxidase mimicking activity of ternary MoS2-loaded ZnO–g-C3N4 nanocomposites (ZnO–g-C3N4/MoS2) has been developed for the determination of Hg(ii) ions over co-existing metal ions.
Solar-light-active mesoporous Cr–TiO2 for photodegradation of spent wash: an in-depth study using QTOF LC-MS
Authors: Takle Shrikant P. , Apine Onkar A. , Ambekar Jalindar D. , Landge Sukeshani L. , Bhujbal Namdeo N. , Kale Bharat B. , Sonawane Ravindra S.
Published: February 2019

A dark coloured effluent called “spent wash” is generated as an unwanted product in sugar based alcohol distillery which is degraded to less toxic compounds using visible light active Cr–TiO2 photocatalyst under natural sunlight.
An essential descriptor for the oxygen evolution reaction on reducible metal oxide surfaces
Authors: Huang Xiang , Wang Jiong , Tao Hua Bing , Tian Hao , Xu Hu
Published: February 2019

The number of excess electrons (NEE), as a descriptor, perfectly reproduces the OER volcano curve of TiO2(110) plotted using ΔGO − ΔGOH.
Controlled living anionic polymerization of cyanoacrylates by frustrated Lewis pair based initiators
Authors: Sáez Rubén , McArdle Ciaran , Salhi Fouad , Marquet Jordi , Sebastián Rosa M.
Published: February 2019

Controlled living anionic polymerization of cyanoacrylates promoted by a hydrogenated frustrated Lewis pair ([TMPH+][HB(C6F5)3−]). Preparation of designed block copolymers.
Selective high-resolution DNP-enhanced NMR of biomolecular binding sites
Authors: Marin-Montesinos Ildefonso , Goyard David , Gillon Emilie , Renaudet Olivier , Imberty Anne , Hediger Sabine , De Paëpe Gaël
Published: February 2019

Sel-DNP allows selective recovery of high-resolution information from protein binding sites by DNP-enhanced NMR.
Torque-induced reorientation in active fibre-reinforced materials
Authors: Ciambella Jacopo , Nardinocchi Paola
Published: February 2019

We introduce a continuum model for a fibre reinforced material in which the reference orientation of the fibre may evolve with time, under the influence of external stimuli.
Interfacial properties of lipid sponge-like nanoparticles and the role of stabilizer on particle structure and surface interactions
Authors: Valldeperas Maria , Dabkowska Aleksandra P. , Pálsson Gunnar K. , Rogers Sarah , Mahmoudi Najet , Carnerup Anna , Barauskas Justas , Nylander Tommy
Published: February 2019

Stabilizer P80 concentrated to lipid liquid crystalline particle surface, but contributes also to the inner sponge phase structure. Particles spread on surfaces to form bilayers.
A novel alkylsilyl-fused copolymer-based non-fullerene solar cell with over 12% efficiency
Authors: Xu Guodong , Chen Lie , Lei Hui , Liao Zhihui , Yi Nan , Liu Jinliang , Chen Yiwang
Published: February 2019

A new alkylsilyl-fused copolymer PBDS-TZ unit was developed as donor material for polymer solar cells. When blended with IT-4F, an appropriate micromorphology with vertical component distribution in active layer was obtained. A notably PCE of 12.01% with a high FF of 73.1% and JSC of 20.45 mA cm−2 for the devices.
Template based sintering of WO3 nanoparticles into porous tungsten oxide nanofibers for acetone sensing applications
Authors: Imran Muhammad , Rashid Syed Sulthan Alaudeen Abdul Haroon , Sabri Ylias , Motta Nunzio , Tesfamichael Tuquabo , Sonar Prashant , Shafiei Mahnaz
Published: February 2019

Porous WO3 nanofibers have been synthesized by electrospinning polyvinylpyrrolidone (PVP) nanofibers embedded with semiconducting WO3 nanoparticles followed by annealing in air and have been tested toward acetone.
AMPK is associated with the beneficial effects of antidiabetic agents on cardiovascular diseases
Authors: Lu Qingguo , Li Xuan , Liu Jia , Sun Xiaodong , Rousselle Thomas , Ren Di , Tong Nanwei , Li Ji
Published: February 2019

Diabetics have higher morbidity and mortality in cardiovascular disease (CVD). A variety of antidiabetic agents are available for clinical choice. Cardiovascular (CV) safety assessment of these agents is crucial in addition to hypoglycemic effect before clinical prescription. Adenosine 5′-monophosphate-activated protein kinase (AMPK) is an important cell energy sensor, which plays an important role in regulating myocardial energy metabolism, reducing ischemia and ischemia/reperfusion (I/R) injury, improving heart failure (HF) and ventricular remodeling, ameliorating vascular endothelial dysfunction, antichronic inflammation, anti-apoptosis, and regulating autophagy. In this review, we summarized the effects of antidiabetic agents to CVD according to basic and clinical research evidence and put emphasis on whether these agents can play roles in CV system through AMPK-dependent signaling pathways. Metformin has displayed definite CV benefits related to AMPK. Sodium-glucose cotransporter 2 inhibitors also demonstrate sufficient clinical evidence for CV protection, but the mechanisms need further exploration. Glucagon-likepeptide1 analogs, dipeptidyl peptidase-4 inhibitors, α-glucosidase inhibitors and thiazolidinediones also show some AMPK-dependent CV benefits. Sulfonylureas and meglitinides may be unfavorable to CV system. AMPK is becoming a promising target for the treatment of diabetes, metabolic syndrome and CVD. But there are still some questions to be answered.
Tropical cyclone intensity prediction based on recurrent neural networks
Authors: Pan Bin , Xu Xia , Shi Zhenwei
Published: February 2019

The accurate prediction for the tropical cyclone (TC) intensity is a recognised challenge. Researchers usually develop dynamical models to address this task. However, since the TC intensity is highly influenced by various factors such as ocean and atmosphere conditions, it is difficult to build the very model which can explicitly describe the mechanism of TC. A new idea is developed, utilising the massive historical observation data by a deep learning approach, to conduct a completely data‐driven TC intensity prediction model. All the TC intensity and track data which have been observed in Western North Pacific since 1949 are collected, and recurrent neural network for TC intensity prediction is constructed. In general, their motivation as well as novelty is to develop a data‐driven approach instead of empirical models. There are very few researches similar to their exploratory work. The proposed method has presented 5.1 ms error in 24 h prediction, which is better than some widely used dynamical models and is close to subjective prediction.
Instantaneous in‐band radio frequency interference suppression using non‐linear folders
Authors: Chen E. , Hsueh J.‐C. , Chen V.
Published: February 2019

A front‐end adaptive folder with a filter is presented to instantaneously push jammers to higher frequencies while preserving the integrity of small signals of interest. A programmable filter is utilised to further suppress folded jammers for achieving a widely scalable dynamic range over a large frequency range. To achieve maximum programmability with a minimal increase of power and area, combinatorial intrinsic device characteristics are exploited to tune folding points for rapid adaptation to a changing electromagnetic environment.
Three implementations of the tone reservation PAPR reduction scheme for the FBMC/OQAM system
Authors: Laabidi Mounira , Bouallegue Ridha
Published: February 2019

The fifth generation upcoming applications require an alternative multicarrier modulation (MCM) scheme rather than the well‐known orthogonal frequency division multiplexing scheme. Filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) is the most suitable scheme to meet this requirement. However, as an MCM, the high peak to average power ratio (PAPR) is a significant problem which upsets the FBMC/OQAM signal. In the presence of a non‐linear high power amplifier, FBMC/OQAM signals with high PAPR can be strongly distorted. To date, the PAPR reduction technique called tone reservation (TR) has been revised and adapted to the overlapping nature of the FBMC/OQAM signal in many research works. In view of that, the authors (i) present two refined TR methods deemed relevant for reducing the PAPR of the FBMC/OQAM and (ii) compare their performances with those of some existing versions of TR PAPR reduction methods.
Performance evaluation of a downlink MIMO wideband code‐division multiple access‐based radio‐over‐fibre system using Alamouti space‐time block code
Authors: Baghersalimi Gholamreza , Rahimi Mohammad , Nassiri Mahdi
Published: February 2019

In this work, the effect of a radio‐over‐fibre (RoF) subsystem on the bit error rate (BER), total degradation (TD) and system capacity performances of downlink multiple‐input multiple‐output (MIMO) wideband code division multiple access (WCDMA) are assessed. The research investigates the use of maximal ratio combining (MRC) in single‐input multiple‐output (SIMO) schemes and Alamouti space‐time block coding (STBC) in MIMO systems to compensate for the collective effects of the optical subsystem and the radio channel for different channel conditions and number of users. Results show that the aforementioned techniques are effective methods to compensate for both the non‐linearity of the optical subsystem and the time‐varying wireless radio frequency (RF) channel. It is also demonstrated that by increasing the number of users for severe non‐linearity conditions, the BER performance of the system is significantly affected. Also, an appropriate quiescent point can always be found for the optical subsystem which improves the system performance irrespective of different conditions.
Induction cage machine thermal transients under lowered voltage quality
Authors: Gnaciński Piotr , Pepliński Marcin , Hallmann Damian , Jankowski Piotr
Published: February 2019

In many power systems, voltage parameters change over time. Variation of power quality disturbances causes thermal transients in electrical machines. Under volatile power quality disturbances, the windings temperature can reach an extremely high level. This problem might be especially important in the case of low‐power motors, as they have comparatively short thermal time constants. In this study, thermal transients of an induction machine are analysed for time‐varying power quality disturbances. The machine's thermal response to voltage deviation, voltage unbalance, and voltage waveform distortions is compared. The effect of fluctuating voltage unbalance on the heating of the windings is examined. The results of experimental investigations and numerical calculations are presented for two low‐power, totally enclosed fan‐cooled induction cage machines. It was found that voltage unbalance causes much faster heating of the windings than do other power quality disturbances and that the current power quality standards require revision.
Dynamic simulation of CIG in large unbalanced distribution systems using an open source tool
Authors: Yu Ziwei , Tang Yingying , Yao Tong , Ayyanar Raja
Published: February 2019

This study explains the underlying concepts and implementation details of using an open source distribution analysis tool – OpenDSS to conduct dynamic simulations of converter interfaced generation (CIG) in large, realistic power distribution systems. The dynamic models of different types of CIGs are derived and written into the dynamic‐link library (DLL) to be called by OpenDSS during simulation. The DLL development is illustrated in detail with the programme structure and the model derivation of CIG. A phasor domain modelling method is adopted to derive single‐phase CIG models in order to make the DLL models compatible with OpenDSS. The conversion between phasor and natural waveform data when simulating single‐phase systems is discussed. The DLLs are derived based on the equations of the power stage circuit including the filters and the specific controllers. Applications of developed DLLs are illustrated with test cases, where volt‐VAR control and microgrid mode control of CIGs are tested in a large‐scale distribution system. This study can be used as a tutorial for performing the dynamic analysis for single‐phase converters in OpenDSS.
Comprehensive prediction method for failure rate of transmission line based on multi‐dimensional cloud model
Authors: Lei Jiazhi , Gong Qingwu
Published: February 2019

In allusion to the prediction for the failure rate of transmission lines under multiple external environmental factors, a comprehensive prediction method for the failure rate of transmission lines based on an multi‐dimensional cloud model and Cholesky decomposition was proposed in this study. According to the historical data in meteorological early warning system and icing forecasting system, the mutual correlation degrees of these multiple external environmental factors are got by the grey relational algorithm and the comprehensive prediction model for the failure rate of transmission lines was established based on an multi‐dimensional cloud model and Cholesky decomposition. In light with the external environmental factors in the next year, the failure rate of transmission lines was predicted by this proposed method. The test results based on actual data in Guizhou Power Grid show that this proposed comprehensive prediction method for the failure rate of transmission lines has high accuracy as the prediction error is about 2.05% and a much low computational burden as it only takes 30.25 s which is highly suitable for practical applications.
Optimal energy management for the residential MES
Authors: Wu Xiaorui , Li Yong , Tan Yi , Cao Yijia , Rehtanz Christian
Published: February 2019

Nowadays, with the development of distributed energy resource (DER) technologies, various DERs would be widely applied to residential houses. By integrating electricity, thermal energy, natural gas, and other forms of energy into residential sectors, it provides an opportunity for energy users to exploit the complementarity of multi‐energy resources. However, it is also a formidable challenge for users to manage such a multi‐energy system (MES) designed for residential houses. The authors propose an integrated architecture for residential MES incorporating multi‐energy resources, such as electricity, thermal energy, natural gas, and renewable energy. Besides, an optimisation model for MES is developed for coordinating energy generation, storage and consumption devices, and minimise energy cost under time‐varying pricings. Additionally, the thermal comfort level is considered. An International Organization of Standard for the thermal comfort model is employed to precisely estimate and maintain residents' thermal comfort. The interaction among multiple energies is investigated via the model. The results show that the proposed model can offer significant cost‐saving while maintaining user comfort through optimal scheduling of household devices and management of multi‐energy sources.
Implementation of higher order CNAD CFS‐PML for truncating unmagnetised plasma
Authors: Li Jianxiong , Wu Peiyu , Jiang Haolin
Published: February 2019

An unconditionally stable implementation of the higher order complex frequency‐shifted (CFS) perfectly matched layer (PML) is proposed for the Crank–Nicolson‐approximate‐decoupling (CNAD) finite‐difference time‐domain (FDTD) scheme. The proposed higher order CFS‐PML, which is implemented by the auxiliary differential equation (ADE) method, not only has better performance than the first‐order PML but also maintains the unconditional stability of the origin Crank–Nicolson (CN) algorithm. The unmagnetised plasma, which can be expressed by the Drude medium and implemented by the piecewise linear recursive convolution (PLRC) method, is truncated by the proposed PML scheme. A numerical example is provided to validate the effectiveness of the proposed formulations.
Comprehensive study of fast load modulation with volt‐second balance in a dual‐active‐bridge converter
Authors: Tang Yu , Li Xiaodong , Zhou Sheng‐Zhi , Sun Chuan , Chen Guo
Published: February 2019

The procedure of load transition in a dual‐active‐bridge converter is expected to be fast and spike free. To achieve such a goal, the total required adjustment of phase‐shift angles should be assigned to different switch arms properly. This study discusses all possible combinations of two switch arms and their related phase‐shifts, which could result in several different solutions. By forcing a zero algebraic variation of the volt‐second product, all solutions can keep the volt‐second balance of the power inductor so that no risk of magnetic saturation in the transient state exists. The possibility of temporal overshoot current can be checked by verifying the monotonicity of the intermediate volt‐second product. A comparison of all solutions is made to give a suggestion for their feasibility. Experimental tests are included at last which validated the theoretical analysis.
Inverse Radon transform scaling via spin rate estimation for resident space object size assessment
Authors: Ghio Selenia , Martorella Marco
Published: February 2019

The population of resident space objects (RSOs) has increased drastically during the past years. These objects became a great threat for active satellites. The consequences of a collision with orbital debris strictly depend on the size and velocity of the debris. Typical collision velocities range from seven to fifteen kilometres per second, depending on the collision angle. Such debris must be detected, tracked, and catalogued in order to avoid collisions. Here, object size‐related parameters will be estimated by making use of a scaled inverse Radon transform (IRT). The scaled IRT is obtained by estimating the object spin rate.
Silver‐loaded delaminated hectorite nanoparticles for antibacterial materials
Authors: Chen Mingjie , Li Ruimin , Shu Xiulin , Li Liangqiu , Xie Xiaobao , Shi Qingshan
Published: February 2019

Silver nanoparticles are excellent antibacterial materials with wide application. However, it is extremely unstable associated with easy aggregation and colour changes. Although a great number of carriers have been developed for stable silver nanoparticles, it is never ending to broaden silver carrier to meet varying applications. Herein, delaminated hectorite was developed as an alternative silver carrier. The structure of silver‐loaded delaminated hectorite was confirmed by X‐ray diffraction, X‐ray photoelectron spectroscopy and scanning electron microscopy/energy‐dispersive X‐ray studies. Silver (8.69 wt%) was loaded onto the hectorite nanoparticles by cationic ionic change and surface coating. The silver‐loaded hectorite showed fast bacterial killing ability (kill more than 94% Escherichia coli and 83% Staphylococcus aureus at 50 ppm within 1 h) by destroying bacterial cell wall.
Experimental determination of a mass loss of biomass pellets at different temperatures of the combustion chamber combusted in a stream of inert material
Authors: Kaczyńska Katarzyna , Kaczyński Konrad , Pełka Piotr
Published: February 2019

In the herein paper, research on the mass loss of biomass pellets is presented. The research was carried out on a specially constructed test stand. In the research three types of pellet fuels were used, which were made of oak sawdust, sunflower husk and straw. The research was carried out at three different temperatures of the combustion chamber: 850°C, 750°C and 650°C. The research was carried out without inert material and mass rate flow Gs=2,5kg/m2s and Gs=5kg/m2s. Quartz sand was the inert material. It was expected that an increase in the temperature prevailing in the combustion chamber would accelerate the process of mass loss of the biomass pellet combustion. However, the results of the experiment indicated that this is not the case in every analyzed case. The mass flow rate of inert material intensifies the combustion process and accelerates the biomass pellets made of oak sawdust mass loss, but increasing the temperature in the combustion chamber accelerates the process of biomass pellets mass loss more than the mass flow rate of inert material. Based on the experimental tests carried out, it was found that biomass can be combusted in circulating fluidized bed boilers, albeit due to the diversified chemical composition of the biomass (alkali content), the boiler should be operated in such a way as to prevent the softening and melting temperature of the ash being exceeded.
Investigation on internal structure of pellets with halloysite additive and effect of moisture content before the pelletizing process
Authors: Wnorowska Joanna , Tymoszuk Mateusz , Kalisz Sylwester
Published: February 2019

The article presents analysis of the particle size distribution inside pellets and the influence of moisture content before pelletization process on final product mechanical strength. The following types of biomass were used without and with the content of additive (halloysite): Polish wheat straw – (SP-K), miscanthus (DM), cereal straw (DS) and herbaceous pellets (BZ). Particles inside pellets were characterized by a grain size smaller than 3 mm and the cumulative weight percent passing through the sieve with mesh screen 1 mm for each sample was higher than 70 %. The moisture content before pelletization process for tested materials was in the range of 25% - 30% depending on the material which was used, while values of mechanical strength of pellets were within the range of 77.7% - 96.2% (depending on the type of material and moisture content before the pelletization process).
Hybrid technology of reduction of nitrogen oxides (NOx) in exhaust gases; Part 2 – Numerical model of pilot scale regenerative rotary air heater (RAH) retrofited with selective catalyst reduction (SCR) modules
Authors: Kwiczala Andrzej , Wejkowski Robert
Published: February 2019

This article exhibits the results of the analysis performed to verify the effectiveness of the hybrid flue gas denitrification system (herein referred to as HDS) which involved the retrofitting for selective catalytic reduction (SCR) material into a regenerative rotary air heater (RAH). A numerical model corresponding to the actual pilot scale RAH operating conditions was developed. The ultimate intent of the numerical model is to provide a platform where the technology can be implemented on full scale air preheaters. The numerical analysis performed on the pilot scale HDS installation showed a 3% decrease in heat exchange efficiency in the exchanger. This decrease was significantly minimized by the use of blades adjusting the distribution of flue gases entering the RAH. This means that the exhaust gas temperature at the exchanger outlet increased by 4°C, which corresponds to an average of 0.3% increase in the boiler outlet loss. It was also recognized that the air temperature was reduced by 8°C, which does not translate into significant changes in boiler performance parameters. other boiler operating parameters in a noticeable way during operation.
Recent results of the pion-nucleon scattering and the widths of the delta and Roper resonances in BChPT
Authors: Gegelia J.
Published: February 2019

Recent calculations of the pion-nucleon scattering in covariant baryon chiral perturbation theory with explicit delta resonances are presented. Two-loop results of the widths of the Δ and Roper resonances are discussed in the framework of an effective field theory with nucleons, pions and the Roper and delta resonances as dynamical degrees of freedom.
The recent results in the analysis of the meson production reactions
Authors: Sarantsev A. V.
Published: February 2019

The recent results from the Bonn-Gatchina group are presented and discussed. The analysis of the new data on the η and η′ photoproduction off proton firmly confirms the existence of three nucleon resonances with masses around 1900 MeV. The combined analysis of the data on the kaon proton collision reactions indicates the presence of new states which were missed in the analysis of the separate data sets.
News from the Lattice: example of the pion distribution amplitude
Authors: Korcyl Piotr
Published: February 2019

In this contribution I present a brief summary of recent progress in selected Lattice QCD techniques and subsequently illustrate them using the example of the current calculations of moments of meson distribution amplitude as well as of a direct evaluation of meson distribution amplitude.
COMPASS: meson spectroscopy and low-energy meson dynamics
Authors: Friedrich Jan M.
Published: February 2019

Within the broad physics programme of the COMPASS collaboration at CERN SPS, soft reactions of high-energy hadron beams on different nuclear targets are investigated. Aiming at a better understanding of the strong interaction, novel results range from tests of chiral symmetry breaking to properties of diffractively produced meson resonances studied in their multi-particle decays, such as the a1(1420) with unusual properties. The talk will highlight the challenges of the employed experimental techniques, and as well of the analysis methods, that are developed to a large extent along with the analysis of the world’s largest data sets in the field.
Recent progress in the partial wave analysis of the diffractively produced π−π+π− final state at Compass
Authors: Krinner Fabian
Published: February 2019

The Compass spectrometer at CERN has collected a large data set for diffractive three-pion production of 46 × 106 exclusive events. Based on previous conventional Partial-Wave Analyses (PWA), we performed a “freed-isobar PWA” on the same data, removing model assumptions on the dynamic isobar amplitudes for dominating waves. In this analysis, we encountered continuous mathematical ambiguities, which we were able to identify and resolve. This analysis gives an unprecedented insight in the interplay of 2π and 3π dynamics in the process. As an example we show results for a spin-exotic wave $J_{{X^ - }}^{PC} = {1^{ - + }}$ wave.
Radiative corrections in Dalitz decays of π0, η and η′ mesons
Authors: Husek Tomáš
Published: February 2019

We briefly summarize current experimental and theoretical results on the two important processes of the low-energy hadron physics involving neutral pions: the Dalitz decay of π0 and the rare decay π0 → e+e−. As novel results we present the complete set of radiative corrections to the Dalitz decays η(′) → l+l−γ beyond the soft-photon approximation, i.e. over the whole range of the Dalitz plot and with no restrictions on the energy of a radiative photon. The corrections inevitably depend on the η(′) → γ*γ(*) transition form factors.
High spin resonances produced in π+π−π− and π−π0π0 systems at VES setup
Authors: Kachaev Igor , Ryabchikov Dmitry
Published: February 2019

A study of high spin resonances produced in π+π−π− and π−π0π0 systems with 29 GeV/c π− beam on Be target is presented. About 87 million events for the first one and 32 million events for the second one are collected with VES setup in a wide range of transfer momentum squared 0 < |t′| < 1 GeV2/c2. For both reactions this is the largest statistics in the world. The data are analysed using the PWA formalism of full rank density matrix and rank 1 density matrix. The a3(1875) and a4(2040) meson parameters are given and their production mechanism is discussed.
Study of e+e− annihilation to hadrons at the VEPP-2000 collider
Authors: Beloborodov K.I. , Achasov M.N. , Akhmetshin R.R. , Amirkhanov A.N. , Anisenkov A.V. , Aulchenko V.M. , Banzarov V.Sh. , Barnyakov A.Yu. , Bashtovoy N.S. , Berdyugin A.V. , Bogdanchikov A.G. , Bondar A.E. , Botov A.A. , Bragin A.V. , Dimova T.V. , Druzhinin V.P. , Eidelman S.I. , Epifanov D.A. , Epshteyn L.B. , Erofeev A.L. , Fedotovich G.V. , Gayazov S.E. , Golubev V.G. , Grebenuk A.A. , Gribanov S.S. , Grigoriev D.N. , Ignatov F.V. , Ivanov V.L. , Kardapoltsev L.V. , Karpov S.V. , Kazanin V.F. , Kharlamov A.G. , Korneev L.A. , Korobov A.A. , Korol A.A. , Koshuba S.V. , Kovrizhin D.P. , Kozyrev A.N. , Kozyrev E.A. , Krokovny P.P. , Kupich A.S. , Kuzmenko A.E. , Kuzmin A.S. , Litvinov R.A. , Logashenko I.B. , Lukin P.A. , Martin K.A. , Melnikova N.A. , Mikhailov K.Yu. , Obrazovsky A.E. , Okhapkin V.S. , Pakhtusova E.V. , Pestov Yu.N. , Popov A.S. , Pugachev K.V. , Razuvaev G.P. , Ruban A.A. , Ryskulov N.M. , Ryzhenenkov A.E. , Serednyakov S.I. , Shebalin V.E. , Shemyakin D.N. , Shtol D.A. , Shwartz B.A. , Sibidanov A.L. , Silagadze Z.K. , Solodov E.P. , Surin I.K. , Talyshev A.A. , Titov V.M. , Usov Yu.V. , Vasiljev A.V. , Vorobiov A.I. , Yudin Yu.V. , Zhabin V.N. , Zhulanov V. V.
Published: February 2019

We present current status of the SND and CMD-3 experiments at the VEPP-2000 e+e− collider and recent result of data analysis on the processes $e^+e^-\rightarrow\pi^+\pi^-,n\overline n,\pi^+\pi^-\eta,\pi^+\pi^-\pi^0\eta,K_SK_L\pi^0$, etc.
ρ meson GPDs and IPDs with a light-front constituent quark model
Authors: Sun Bao-Dong , Dong Yu-Bing
Published: February 2019

We investigate the ρ meson unpolarized Generalized Parton Distributions based on a Light-Front Constituent Quark Model. Moreover, by employing a Gaussian form wave packet, we apply the obtained generalized parton distributions to get the Impact Parameter dependent parton Distributions.
Inclusive K+ production in π− + A collisions at 1.7 GeV/c
Authors: Wirth Joana
Published: February 2019

The production and properties of K+ in nuclear reactions π− + A (A = C; W) at an incident beam momentum of 1.7 GeV/c has been studied with the HADES setup at SIS18/GSI. Phase space distributions of kaons produced off heavy and light nuclei can be studied to extract information about the KN potential. We present the analysis method, normalization procedure and first results on the ratio of inclusive (K+) cross-sections in π−-induced reactions on W and C targets in comparison to existing measurement by FOPI and ANKE.
Open charm measurements at CERN SPS energies with the new Vertex Detector of the NA61/SHINE experiment
Authors: Merzlaya Anastasia
Published: February 2019

The study of open charm meson production provides an efficient tool for detailed investigations of the properties of hot and dense matter formed in nucleus-nucleus collisions. The interpretation of the existing data from the CERN SPS suffers from a lack of knowledge on the total charm production rate. To overcome this limitation the heavy-ion programme of the NA61/SHINE experiment at CERN SPS has been expanded to allow for precise measurements of particles with a short lifetime. A new Small Acceptance Vertex Detector (SAVD) was designed and constructed to meet the challenges of open charm measurements in nucleus-nucleus collisions. SAVD was installed in December 2016 for data taking with Pb+Pb collisions at 150A GeV/c. An exploratory set of collected data allowed to validate the general concept of the D0 mesons detection via its D0→π++K- decay channel and delivered the first direct observation of open charm at SPS energies. In October and November of 2017 a large statistic data set has been taken for Xe+La at 150A, 75A, and 40A GeV/c, these data are currently under intense analysis. The physics motivation behind the open charm measurements at the SPS energies will be discussed. Moreover, the concept of the SAVD hardware and status of the analysis will be shown. Also, the future plans of open charm measurements in the NA61/SHINE experiment related to the upgraded Vertex Detector will be presented.
A study of the vector meson ψ(4040)
Authors: Piotrowska M. , Giacosa F.
Published: February 2019

We investigate the well-known $c\overline c $ vector state ψ(4040) in the frame-work of a quantum field theoretical model. In particular, we study its spectral function and search for the pole(s) in the complex plane. Quite interestingly, the spectral function has a non-standard shape and two poles are present. The role of the meson-meson quantum loops (in particular DD* ones) is crucial and could also explain the not yet conformed “state” Y(4008).
Importance of mesons in light-by-light scattering in ultraperipheral lead-lead collisions at the LHC
Authors: Kłusek-Gawenda Mariola
Published: February 2019

Possibility of PbPb→PbPbγγ measurement at smaller (< 5 GeV) diphoton invariant mass will be presented. Analysis focuses only on ultraperipheral heavy-ion collisions. This estimate shows that the γγ → γγ collisions can be measured at the LHC by ALICE and LHCb experiments for diphoton invariant mass > 2 GeV. Predictions for the γγ → η, γγ → η′ resonance scattering shows that these resonances can be measured with rather good statistics. A possible observation of peaks related to intermediate η, η′(958), ηc(1S), ηc(2S), χc0(1P) mesons will be presented too. Attempts of reduction of background which comes from dipion production will be considered.
Various types of theoretical uncertainties by example of the elastic nucleon-deuteron scattering spin correlation coefficient Cz,x
Authors: Volkotrub Yu. , Golak J. , Skibiński R. , Topolnicki K. , Witała H.
Published: February 2019

The elastic nucleon-deuteron scattering process can be used to study three-nucleon dynamics, but in order to draw reliable conclusions based on the comparison of theoretical predictions and data, an estimation of theoretical uncertainties is necessary. We consider the statistical errors arising from a propagation of uncertainties of the two-nucleon interaction parameters to the three-nucleon system, truncation errors, regulator dependencies, and uncertainties arising from using the formalism of partial waves. We give an example of the nucleon-deuteron spin correlation coefficient Cz,x, obtained within the Faddeev approach, to discuss magnitudes of the above mentioned theoretical uncertainties. We find that using various models of the nuclear forces results in the dominant theoretical uncertainty for the nucleon-deuteron elastic scattering observables.
Polarimetry for a storage-ring electric-dipole-moment measurement
Authors: Żurek Maria
Published: February 2019

These proceedings summarize the progress which has been made within the Jülich Electric Dipole Moment Investigations (JEDI) Collaboration on deuteron beam polarimetry for a storage-ring electric-dipole-moment (EDM) measurement. The design of a dedicated EDM polarimeter requires a precise database for optimization purposes. To address this need, a measurement of a deuteron-carbon scattering database has been performed with the forward part of the WASA-at-COSY detector. Preliminary results for vector analyzing powers and unpolarized differential cross sections for different deuteron beam energies are presented.
Chiral anomaly and strange-nonstrange mixing
Authors: Giacosa Francesco
Published: February 2019

As a first step, a simple and pedagogical recall of the η-η′ system is presented, in which the role of the axial anomaly, related to the heterochiral nature of the multiplet of (pseudo)scalar states, is underlined. As a consequence, η is close to the octet and η′ to the singlet configuration. On the contrary, for vector and tensor states, which belong to homochiral multiplets, no anomalous contribution to masses and mixing is present. Then, the isoscalar physical states are to a very good approximation nonstrange and strange, respectively. Finally, for pseudotensor states, which are part of an heterochiral multiplet (just as pseudoscalar ones), a sizable anomalous term is expected: η2(1645) roughly corresponds to the octet and η2(1870) to the singlet.
Polarization analysis of p̄ produced in pA collisions
Authors: Grzonka D. , Alfs D. , Asaturyan A. , Carmignotto M. , Diermaier M. , Eyrich W. , Głowacz B. , Hauenstein F. , Horn T. , Kilian K. , Lersch D. , Malbrunot-Ettenauer S. , Mkrtchyan A. , Mkrtchyan H. , Moskal P. , Nadel-Turonski P. , Oelert W. , Ritman J. , Sefzick T. , Tadevosyan V. , Widmann E. , Wolke M. , Zhamkochyan S. , Zieliński M. , Zink A. , Zmeskal J.
Published: February 2019

A quite simple procedure for the generation of a polarized antiproton beam could be worked out if antiprotons are produced with some polarization. In order to investigate this possibility measurements of the polarization of produced antiprotons have been started at a CERN/PS test beam. The polarization will be determined from the asymmetry of the elastic antiproton scattering at a liquid hydrogen target in the CNI region for which the analyzing power is well known. The data are under analysis and an additional measurement is done in 2018. Details on the experiment and the ongoing data analysis will be given.
Drift chamber calibration and particle identification in the P-349 experiment
Authors: Alfs D. , Asaturyan A. , Carmignotto M. , Diermaier M. , Eyrich W. , Głowacz B. , Grzonka D. , Hauenstein F. , Horn T. , Kilian K. , Lersch D. , Malbrunot-Ettenauer S. , Mkrtchyan A. , Mkrtchyan H. , Moskal P. , Nadel-Turonski P. , Oelert W. , Ritman J. , Sefzick T. , Tadevosyan V. , Widmann E. , Wolke M. , Zhamkochyan S. , Zieliński M. , Zink A. , Zmeskal J.
Published: February 2019

The goal of the P-349 experiment is to test whether 3.5 GeV/c antiprotons produced in high-energy proton-proton collisions are polarized in view of the preparation of a polarized antiproton beam. In this article, we present the details of the ongoing analysis focused on the drift chambers calibration and particle identification with DIRC.
Contribution of QCD condensates to the OPE of Green functions of chiral currents
Authors: Kadavý Tomáš , Kampf Karol , Novotný Jiří
Published: February 2019

A framework of operator product expansion (OPE) allows us to study high-energy behaviour of Green functions. A calculation of such Green functions within chiral perturbation theory (χPT) or resonance chiral theory (RχT) and subsequent matching of the result to the OPE enables us to determine constraints for unknown parameters of the effective theories. We present such procedure for Green functions in the odd-intrinsic parity sector of QCD.
Luminosity determination for the proton-deutron reactions using quasi-free reactions with WASA-at-COSY facility
Authors: Khreptak Aleksander , Rundel Oleksandr , Skurzok Magdalena
Published: February 2019

The scientific aim of our research is experimental confirmation of the existence of mesic-nucleus: a new exotic kind of nuclear matter consisting of nucleons and mesons. In this report we present the method of luminosity determination for experiment performed atWASA-at-COSY detector dedicated to search for 3He-η bound state. This method is based on analysis of quasi-free $pd \to ppn_{{\rm{spec}}} $ reaction.
Eight years after IYA2009: a successful project of Outreach and Astronomy Education on selected countryside towns in Mexico
Authors: Bravo-Alfaro Hector , Caretta Cesar A. , Macias Gloria Felipe , Brito Elcia M. S. , Rodríguez Patricia Campos , Torres-Papaqui Juan Pablo , Juarez Sandoval Eloy
Published: February 2019

We present the main results of a multidisciplinary project on education and outreach in Guanajuato (Mexico). This collaboration was initiated in the International Year of Astronomy (IYA09, IAU-UNESCO, 2009) and is led by a team including astronomers, sociologists and environment biologists. The Astronomy activities had their origin at the Public Observatory of Universidad de Guanajuato, where an outreach program was dedicated to young students, teachers and the general public. Thanks to the many activities linked to IYA09, the astronomers joined with a group of sociologists working on the development of rural zones of the Mexican State of Guanajuato. This region undergoes a high rate of migration towards the USA. Working together, our goals were enlarged, having important results on different aspects like social development, environment recovering and education. Astronomy plays a central role within this project, mainly through activities like stargazing, science games for young public, Astronomy courses for teachers, and talks for a wide audience.
The impact on education of Astronomical Olympiads and the International Olympiad on Astronomy and Astrophysics
Authors: Stachowski Greg , Sule Aniket
Published: February 2019

Astronomical Olympiads and similar competitions for highschool students have been run in some countries for more than half a century, and last year marked the tenth anniversary of the largest such competition with global reach, the International Olympiad on Astronomy and Astrophysics. The effect of these has been to reach out to a large number of school students who might not otherwise have considered astronomy as a subject; help maintain a high, guided standard of astronomy education even in countries where astronomy is not (or no longer) on the curriculum; and to encourage those students who participate to strive harder and pursue astronomy further by giving them goals to aim for, rewarding their efforts with medals, recognition and participation in the international events in interesting locations and, above all, showing them that there are many other students just like them both in their own country and around the world. Many of the students go on to careers in astronomy education or research. We believe that Astronomy Olympiads are a very valuable element in the astronomy education framework which can be used to further the common goal of sustaining and growing the astronomical community.
Teacher’s misconception in curricular astronomy
Authors: Sule Aniket , Jawkar Swapnil
Published: February 2019

Misconceptions about astronomy concepts are found quite regularly in students, even after they have taken astronomy courses. There are numerous reasons for this [1, 2]. The authors in this paper have focused on the possibility that the existence of these misconceptions could be attributed to the misconceptions of the teacher-instructor and its transmission down to the students that he/she has been teaching. Keeping this in mind, the authors have prepared a questionnaire consisting of assertions split into 5 sections. The teacher-instructors were asked to gauge the truthfulness of the assertions in a survey. The responses to the section on Calendars and the section on Sun and Moon are covered in this article. It was concluded that the respondents of the survey face serious skill deficits in imparting conceptually correct astronomical knowledge to their students. This deficit in skill is not only due to a lack of information on the subject but also due to an inability/unwillingness of the teacher-instructor to make logical inferences/extensions from the knowledge he/she does possess on the topic.