bluuebunny/crossref_metadata_2025_split huggingface dataset:
Confined Heteropoly Blues in Defected Zr‐MOF (Bottle Around Ship) for High‐Efficiency Oxidative Desulfurization
Authors: Chang Xue , Yang Xian‐Feng , Qiao Yang , Wang Shuo , Zhang Ming‐Hui , Xu Jun , Wang Dan‐Hong , Bu Xian‐He 
Published: February 2020

AbstractThe Keggin‐type polyoxometalates (POMs) are effective catalysts for oxidative desulfurization (ODS) and confining these POMs in metal–organic frameworks (MOFs) is a promising strategy to improve their performances. Herein, postsynthetic modification of POMs confined in MOFs by adding thiourea creates more unsaturated metal sites as defects, promoting ODS catalytic activity. Additional modification by confining 1‐butyl‐3‐methyl imidazolium POMs in MOFs is performed to obtain higher ODS activity, owing to the affinity between electron‐rich thiophene‐based compounds and electrophilic imidazolium compounds. The ODS catalytic activities of four Zr‐MOF‐based composites (bottle around ship) including phosphomolybdate acid (PMA)/UiO‐66, [Bmim]3PMo12O40/UiO‐66, PMA/Thiourea/UiO‐66, and [Bmim]3PMo12O40/Thiourea/UiO‐66 are therefore investigated in detail. In order to explore the catalytic mechanism of these MOF composites, their microstructures and electronic structures are probed by various techniques such as X‐ray diffraction, thermogravimetric analysis, Fourier transform infrared, Raman, scanning electron microscope, transmission electron microscope, BET, X‐ray photoelectron spectroscopy, EPR, UV–vis, NMR spectra, and H2‐temperature‐programmed reduction. The results reveal that phosphomolybdate blues and imidazolium phosphomolybdate blues with different Mo5+/Mo6+ ratios with the Keggin structure are confined in defected UiO‐66 for all four composites. This approach can be applied to design and synthesize other POMs/MOFs composites as efficient catalysts.
Overcoming the Interfacial Limitations Imposed by the Solid–Solid Interface in Solid‐State Batteries Using Ionic Liquid‐Based Interlayers
Authors: Pervez Syed Atif , Kim Guktae , Vinayan Bhaghavathi P. , Cambaz Musa A. , Kuenzel Matthias , Hekmatfar Maral , Fichtner Maximilian , Passerini Stefano 
Published: February 2020

AbstractLi‐garnets are promising inorganic ceramic solid electrolytes for lithium metal batteries, showing good electrochemical stability with Li anode. However, their brittle and stiff nature restricts their intimate contact with both the electrodes, hence presenting high interfacial resistance to the ionic mobility. To address this issue, a strategy employing ionic liquid electrolyte (ILE) thin interlayers at the electrodes/electrolyte interfaces is adopted, which helps overcome the barrier for ion transport. The chemically stable ILE improves the electrodes‐solid electrolyte contact, significantly reducing the interfacial resistance at both the positive and negative electrodes interfaces. This results in the more homogeneous deposition of metallic lithium at the negative electrode, suppressing the dendrite growth across the solid electrolyte even at high current densities of 0.3 mA cm−2. Further, the improved interface Li/electrolyte interface results in decreasing the overpotential of symmetric Li/Li cells from 1.35 to 0.35 V. The ILE modified Li/LLZO/LFP cells stacked either in monopolar or bipolar configurations show excellent electrochemical performance. In particular, the bipolar cell operates at a high voltage (≈8 V) and delivers specific capacity as high as 145 mAh g−1 with a coulombic efficiency greater than 99%.
Updating the goal model with user reviews for the evolution of an app
Authors: Gao Shanquan , Liu Lei , Liu Yuzhou , Liu Huaxiao , Wang Yihui 
Published: February 2020

AbstractGoal model is an important model in requirements engineering, and it can describe features and their relationships for supporting the development of apps. Since an app evolves continually, the goal model also needs to be updated with new requirements to guide the whole process. As the feedback of users, reviews provide an abundant resource of user requirements for updating the goal model. In this paper, we propose an approach to help developers (a) analyze reviews to gain the information of user requirements by training a classifier and defining keyword‐based linguistic rules as well as grammar‐based rules and (b) update the goal model with the extracted information, including improving existing goals and extending the model with new goals. In addition, we design a framework to represent results so that they can be understood by developers easily. According to our experiments based on the data in Google Play, the F‐measure of classifier on reviews can reach 75.76%, and the average precision for extracting requirements‐related information from reviews is 84.04%, then we can map the information to goals with the F‐measure of 70.21%. Furthermore, the survey on 22 developers shows that the information provided by us is useful for updating the goal model.
VR‐Rides: An object‐oriented application framework for immersive virtual reality exergames
Authors: Wang Yifan , Ijaz Kiran , Yuan Dong , Calvo Rafael A. 
Published: February 2020

SUMMARYExercise can improve health and well‐being. With this in mind, immersive virtual reality (VR) games are being developed to promote physical activity, and are generally evaluated through user studies. However, building such applications is time consuming and expensive. This paper introduces VR‐Rides, an object‐oriented application framework focused on the development of experiment‐oriented VR exergames. Following the modular programming pattern, this framework facilitates the integration of different hardware (such as VR devices, sensors, and physical activity devices) within immersive VR experiences that overlay game narratives on Google Street View panoramas. Combining software engineering and interaction patterns, modules of VR‐Rides can be easily added and managed in the Unity game engine. We evaluate the code efficiency and development effort across our VR exergames developed using VR‐Rides. The reliability, maintainability, and usability of our framework are also demonstrated via code metrics analysis and user studies. The results show that investing in a systematic approach to reusing code and design can be a worthwhile effort for researchers beyond software engineering.
Phenolic glycosides from the aerial parts of Buddleja macrostachya Benth.
Authors: Hien Truong Thi Thu , Quang Tran Hong , Nhiem Nguyen Xuan , Tai Bui Huu , Phi Vu Phuong , Hien Nguyen Thi Thu , Van Kiem Phan 
Published: February 2020

AbstractFrom the aerial parts of Buddleja macrostachya eight compounds, including: salidroside (1), echipuroside A (2), darendoside A (3), decaffeoylacteoside (4), 9‐O‐α‐L‐rhamnopyranosyl‐4‐hydroxy‐cinnamic acid (5), 8‐hydroxylinalool 3‐O‐β‐D‐glucopyranoside (6), acteoside (7), and martynoside (8) were isolated. Their chemical structures were identified by NMR and MS spectroscopic analysis combined with a comparison to the reported values in the literature. This is the first time to report the isolation of echipuroside A, darendoside A, decaffeoylacteoside, 9‐O‐α‐L‐rhamnopyranosyl‐4‐hydroxy‐cinnamic acid, and 8‐hydroxylinalool 3‐O‐β‐D‐glucopyranoside from the genus Buddleja.
Effect of potential on arsenic treatment using technology of electrocoagulation
Authors: Binh Phan Thi , Van Anh Nguyen Thi , Thuy Mai Thi Thanh , Xuan Mai Thi , The Le Cao 
Published: February 2020

AbstractThe technology of electrocoagulation (TEC) at low constant potential using iron (CT3 steel) for anode material was applied to removal of arsenic from well water. The parameters such as potential, electrolysis time, and initial arsenic concentrations were considered in this study. The suitable electrolysis potential was 6 V at which the arsenic treatment efficiency obtained about 96 % after only one minute. The suitable electrolysis time of 3÷5 minutes was enough for obtaining WHO‐limit (≤ 10 ppb) depending on the initial arsenic concentration from 290 to 800 ppb, respectively. The result of SEM/EDX‐examination indicated that the arsenate was adsorbed on the surface of ferric hydroxide.
An investigation on the electronic structures of diatomic VSi0/−/+ clusters by CASSCF/CASPT2 method
Authors: Thao Nguyen Minh , Hanh Nguyen Thi Hong , Tuan Tran Thanh , Tri Tran Quoc , Van Tan Tran 
Published: February 2020

AbstractMulticonfigurational CASSCF/CASPT2 method is carried out to investigate the geometrical and electronic structures of diatomic VSi0/−/+ clusters. The potential energy profiles of the electronic states are built based on the CASPT2 single‐point energies. From the potential energy profiles, the bond distances, vibrational frequencies, and relative energies of the electronic states are determined. The ionization energy and electron affinity of the neutral cluster are calculated. All the results presented in this work are important to explain the spectroscopic data of VSi0/−/+ clusters
Anti‐inflammatory and cytotoxic activities of constituents from Wedelia trilobata (L.) Hitchc.
Authors: Thao Nguyen Phuong , Binh Pham Thanh , Luyen Nguyen Thi , Cong Nguyen Duy , Dang Nguyen Hai , Dat Nguyen Tien 
Published: February 2020

AbstractUsing various chromatographic separations, five compounds (1–5) were isolated from a methanol extract of W. trilobata leaves. Their structures were elucidated to be paniculoside‐IV (1), 3‐O‐[β‐D‐glucopyranosyl(1‐4)‐β‐D‐glucoronopyranosyl] oleanolic acid 28‐O‐β‐D‐glucopyranosyl ester (2), 5,7,4'‐trihydroxyflavone (3), apigenin 7‐O‐β‐D‐glucopyranoside (4), and 3,4‐dihydroxy‐cinnamic acid (5), by detailed analysis via spectroscopic techniques (IR, 1D, 2D NMR and ESI‐MS data) as well as comparison with those reported. This is the first report of 2 from Wedelia genus. Furthermore, the effects of the isolated compounds on LPS‐induced NO production in RAW264.7 cells and cytotoxic activity (against A549, MCF‐7, Hep3B, and PC3 cell lines) were also evaluated.
Assessment of alkyd paint's self‐healing ability with microcapsules foly(melamine‐urea‐formaldehyde) walled alkyd resin
Authors: Ha La Thi Thai , Mai Chau Ngoc 
Published: February 2020

AbstractRecently, microcapsule containing self‐healing agents and its application in coatings regarding corrosive resistance has played a pivotal role in prolonging the shelf‐life of materials. To optimize anti‐corrosive ability of alkyd paint, this research has concentrated on synthesis of microcapsules based on poly(melamine‐urea‐formaldehyde) (PMUF) walled alkyd resin derived from soybean oil and evaluating self‐healing ability of alkyd paint embedding these microcapsules. The advantages of the PMUF shell were studied such as enhancing the durability of shell layers, optimizing the broken capability of microcapsules through investigating the agitation rate and dispersing time due to the fact that supplementing melamine (6 wt% of the total amount of UF) makes the shells stronger, facilitating the dispersing process in a short time but high self‐healing efficiency (used only 3 wt% of microcapsules). Additionally, alkyd core from soybean oil was used to synchronize with the alkyd paint, thereby homogenizing the coating characteristics and bettering the self‐healing ability and corrosive resistance. The results showed the microcapsules’ characteristics and morphology, and demonstrated the successful self‐healing of microcapsules via Fourier Transform Infrared Spectroscopy (FTIR), particle sizes distribution, Scanning Electron Microscopy (SEM), Electrochemical Impedance Spectroscopy (EIS), tests in NaCl aqueous solution and Q‐Sun instrument.
A study on using modified Corchorus capsularis powder to remove macrolide group from water
Authors: Trong Le Van , Hang Nguyen Thi Thanh , Huy Do Quang , Khai Nguyen Manh , Son Tran Van 
Published: February 2020

AbstractThis study grafted monomer acrylamide onto cellulose (from Corchorus capsularis powder) using trigger system including sodium hydrosulfite (SB) and ammonium peroxodisulfate (APS) to remove the macrolide group (Spiramycin ‐ SPI, Erythromycin ‐ ERY, Tylosin ‐ TYL) from water. Corchorus capsularis powder was pre‐treated by sodium hydroxide 15 % (COC), then modified by a mixture of sodium bisulfite (SB) 0.15 mol/L and ammonium peroxydisulfate (APS) 0.2 mol/L. The material was grafted with monoacrylamide (AM) at ratio AM/COC = 1/1 in 2.5 hours at 60°C. The adsorbent was characterized by FTIR and SEM. After modification with AM, the adsorbent (BTA) was used to adsorb SPI, ERY, and TYL from water. Effects of pH, temperature and adsorbent dose to adsorption performance were studied. Concentration of macrolides were determined by LC/MS‐MS. Maximum adsorption capacities of SPI, ERY, TYL following Langmuir isotherm model were 50.00, 33.33, 25.00 mg/g, respectively. The adsorption constant Kp of SPI, ERY, and TYL following the Freundlich isotherm model were 5383.53, 1082.79 and 1004.76, respectively. The n constant ranged from 1 to 10. The Optimal adsorption condition of SPI, ERY, and TYL to BTA material were fixed at 30°C, pH 7.
Lignan compounds from Stixis suaveolens
Authors: Anh Ngo Quoc , Yen Tran Thi , Hang Nguyen Thuy , Anh Duong Hong , Viet Pham Hung , Hoang Nguyen Huy , Van Doan Vu , Van Kiem Phan 
Published: February 2020

AbstractUsing various chromatographic methods, primary chemical investigation on Stixis suaveolens (Roxb.) (Capparaceae) resulted in the isolation and chemical elucidation of seven lignan compounds: (+)‐lyoniresinol 3α‐O‐β‐D‐glucopyranoside (1), (‐)‐lyoniresinol 3α‐O‐β‐D‐glucopyranoside (2), (‐)‐4‐epi‐lyoniresinol 3α‐O‐β‐D‐glucopyranoside (3), (‐)‐5'‐methoxyisolariciresinol 3α‐O‐β‐D‐glucopyranoside (4), (+)‐5,5'‐dimethoxy‐9‐O‐β‐D‐glucopyranosyl secoisolariciresinol (5), sargentodoside D (6), and (±) secoisolariciresinol (7). This is the first report of these compounds from Stixis suaveolens.
Insights into chemical constituents of Amaranthus spinosus L. (Amaranthaceae)
Authors: Tuyen Pham Nguyen Kim , Duong Nguyen Thi Thuy , Lien Do Thi My 
Published: February 2020

AbstractSeven compounds, including two diglycoside flavonoids hesperidin (1) and rutin (2), one phenolic acid (E)‐ferulic acid (3), two amino acids namely tyrosine (4) and arginine (5) and two sterols comprising spinasterol (6) and spinasterol 3‐O‐β‐D‐glucopyranoside (7) were isolated from the whole plant of Amaranthus spinosus L., Amaranthaceae collected at Bu Dang district, Binh Phuoc province, Vietnam. Their chemical structures were elucidated by spectroscopic methods including ESI–MS, 1D and 2D‐NMR and compared with published data. All these compounds were known to be presented for the first time in this plant. Among them, three compounds 1, 6 and 7 were isolated from Amaranthus genus for the first time.
Retracted: Development of the generation of alkyl radicals from N‐tosyloxaziridines
Authors: Ngoc Nguyen Bich , Thuong Cao Hai 
Published: February 2020

AbstractOxaziridines have attracted much interest of chemists for decades as effective electrophilic oxygen and nitrogen sources. The radical chemistry of oxaziridines is quite rare. We, herein, introduce a novel protocol for successful generation of alkyl radicals from N‐tosyloxaziridines. These radicals were trapped by various 1,1‐diarylethylenes affording products in moderate to good yields. This investigation is hoped to open up the frontier of oxaziridines’ chemistry.
Quinovic acid glycosides from Mussaenda pilosissima Valeton
Authors: Bach Nguyen Xuan , Thu Vu Kim , Trang Do Thi , Van Kiem Phan 
Published: February 2020

AbstractFour known quinovic acid glycosides, quinovic acid 28‐O‐β‐D‐glucopyranosyl ester (1), 3‐O‐α‐L‐rhamnopyranosylquinovic acid 28‐O‐β‐D‐glucopyranosyl ester (glycoside A, 2), and 3‐O‐β‐D‐glucopyranosylquinovic acid 28‐O‐β‐D‐glucopyranosyl ester (glycoside B, 3), 3‐O‐α‐L‐rhamnopyranosylquinovic acid 28‐O‐β‐D‐glucopyranosyl ester (4) were isolated from the aerial parts of Mussaenda pilosissima Valeton. Their chemical structures were determined using NMR spectra as well as in comparison with the reported data. Compounds 1, 2, and 4 were reported for the first time from Mussaenda genus.
Feasible preparation of red‐phosphor K2SiF6:Mn4+coated with SiO2 for white light emitting diodes application
Authors: Quan Vu Thi Hong , Tuyet Doan Thi , Dereń Przemysław J. , Hieu Nguyen Pham Trung , Duy Nguyen Hoang 
Published: February 2020

AbstractWe report a facile approach for coating K2SiF6:Mn4+red‐phosphor with a moisture‐resistant silica layervia the one‐step co‐precipitation using tetraethyl orthosilicate (TEOS) and sodium dodecyl benzene sulphonate (SDBS) surfactant. The bare K2SiF6:Mn4+ (KSF) phosphor with nearly round‐shape and 10 μm diameter, showed a high external quantum yield ~0.502 under 460 nm light excitation. The 40 nm‐ and 80 nm‐thick SiO2 coatinglayers on the phosphor surface was observed via transmission electron microscopy (TEM). The K2SiF6:Mn4+ coated with SiO2 (KSF@SiO2) phosphor possesses bright red emission at approximately 630 nm, high thermal stability and excellent waterproof. Effect of coating layer‐thickness on photoluminescence properties of the prepared phosphors have been investigated and discussion.
Quercetin glycosides and sesquiterpenes from Phoebe poilanei Kosterm
Authors: Thanh Nguyen Thi Viet , Hien Dinh Thi Thu , Minh Tran Thi , Cuong Ho Duc , Nhiem Nguyen Xuan , Yen Pham Hai , Van Kiem Phan 
Published: February 2020

AbstractFour quercetin glycosides, quercetin 3‐O‐[α‐L‐rhamnopyranosyl‐(1 → 6)‐β‐D‐galactopyranoside] (1), quercetin 3‐O‐[α‐L‐rhamnopyranosyl‐(1 → 6)‐β‐D‐glucopyranoside] (2), quercetin 3‐O‐α‐L‐rhamnopyranoside (3), quercetin 3‐O‐β‐D‐glucopyranoside (4), and two sesquiterpens alismol (5) and spathulenol (6) were isolated from the leaves of Phoebe poilanei Kosterm. Their chemical structures were elucidated by analyses of their ESI‐MS, 1D‐NMR and 2D‐NMR spectral data, and comparison with those reported in the literature. This is the first report of compound 1 from genus Phoebe.
Collision of two kinks with inner structure
Authors: Zhong Yuan , Du Xiao-Long , Jiang Zhou-Chao , Liu Yu-Xiao , Wang Yong-Qiang 
Published: February 2020

Abstract
In this work, we study kink collisions in a scalar field model with scalar-kinetic coupling. This model supports kink/antikink solutions with inner structure in the energy density. The collision of two such kinks is simulated by using the Fourier spectral method. We numerically calculate how the critical velocity and the widths of the first three two bounce windows vary with the model parameters. After that, we report some interesting collision results including two-bion escape final states, kink-bion-antikink intermediate states and kink or antikink intertwined final states. These results show that kinks with inner structure in the energy density have similar properties as those of the double kinks.
Probing the EVH limit of supersymmetric AdS black holes
Authors: Goldstein Kevin , Jejjala Vishnu , Lei Yang , van Leuven Sam , Li Wei 
Published: February 2020

Abstract
Extremal black holes in general dimensions are well known to contain an AdS2 factor in their near-horizon geometries. If the extremal limit is taken in conjunction with a specific vanishing horizon limit, the so-called Extremal Vanishing Horizon (EVH) limit, the AdS2 factor lifts to a locally AdS3 factor with a pinching angular direction. In this paper, we study the EVH limit of asymptotically AdS black holes which preserve some supersymmetry. The primary example we consider is the 1/16th BPS asymptotically AdS5 black hole, whose EVH limit has an AdS3 factor in its near-horizon geometry. We also consider the near-EVH limit of this black hole, in which the near-horizon geometry instead contains an extremal BTZ factor. We employ recent results on the large-N limit of the superconformal index of the dual CFT4 to understand the emergence of a CFT2 in the IR of the CFT4, which is the field theory dual to the emergence of the locally AdS3 factor in the near-horizon geometry. In particular, we show that the inverse Laplace transform of the superconformal index, yielding the black hole entropy, becomes equivalent to the derivation of a Cardy formula for the dual CFT2. Finally, we examine the EVH limit of supersymmetric black holes in other dimensions.
Revisiting cellular immune response to oncogenic Marek’s disease virus: the rising of avian T-cell immunity
Authors: Yang Yi , Dong Maoli , Hao Xiaoli , Qin Aijian , Shang Shaobin 
Published: February 2020

AbstractMarek’s disease virus (MDV) is a highly oncogenic alphaherpesvirus that causes deadly T-cell lymphomas and serves as a natural virus-induced tumor model in chickens. Although Marek’s disease (MD) is well controlled by current vaccines, the evolution of MDV field viruses towards increasing virulence is concerning as a better vaccine to combat very virulent plus MDV is still lacking. Our understanding of molecular and cellular immunity to MDV and its immunopathogenesis has significantly improved, but those findings about cellular immunity to MDV are largely out-of-date, hampering the development of more effective vaccines against MD. T-cell-mediated cellular immunity was thought to be of paramount importance against MDV. However, MDV also infects macrophages, B cells and T cells, leading to immunosuppression and T-cell lymphoma. Additionally, there is limited information about how uninfected immune cells respond to MDV infection or vaccination, specifically, the mechanisms by which T cells are activated and recognize MDV antigens and how the function and properties of activated T cells correlate with immune protection against MDV or MD tumor. The current review revisits the roles of each immune cell subset and its effector mechanisms in the host immune response to MDV infection or vaccination from the point of view of comparative immunology. We particularly emphasize areas of research requiring further investigation and provide useful information for rational design and development of novel MDV vaccines.
Shadows in Coxeter Groups
Authors: Graeber Marius , Schwer Petra 
Published: February 2020

AbstractFor a givenwin a Coxeter groupW, the elementsusmaller thanwin Bruhat order can be seen as the end alcoves of stammering galleries of typewin the Coxeter complex$$\Sigma $$Σ. We generalize this notion and consider sets of end alcoves of galleries that are positively folded with respect to certain orientation$$\phi $$ϕof$$\Sigma $$Σ. We call these setsshadows. Positively folded galleries are closely related to the geometric study of affine Deligne–Lusztig varieties, MV polytopes, Hall–Littlewood polynomials, and many more algebraic structures. In this paper, we will introduce various notions of orientations and hence shadows and study some of their algorithmic properties.