bluuebunny/crossref_metadata_2025 huggingface dataset:
Detection of Permethrin pesticide using silver nano-dendrites SERS on optical fibre fabricated by laser-assisted photochemical method
Authors: Pham Thanh Binh , Hoang Thi Hong Cam , Pham Van Hai , Nguyen Van Chuc , Nguyen Thuy Van , Vu Duc Chinh , Pham Van Hoi , Bui Huy
Published: August 2019

Permethrin, 3-Phenoxybenzyl (1 RS)-cis,trans-3-(2,2-dichlorovinyl)- 2,2-dimethylcyclopropanecarboxylate, has a wide range of applications like insecticide, insect repellent and prevents mosquito-borne diseases, such as dengue fever and malaria in tropical areas. In this work, we develop a prominent monitoring method for the detection of permethrin pesticide using surface-enhanced Raman scattering (SERS) optical fibre substrates. The novel SERS-active optical fibre substrates were grown and deposited silver (Ag) nano-dendrites on the end of multi-mode fibre core by laser-assisted photochemical method. The characteristic of the Ag-nanostructures could be controlled by the experimental conditions, namely, laser illumination time. Ag nanoparticles optical fibre substrates and Ag nano-dendrites optical fibre substrates were prepared with laser illumination time of 3 min and 8 min, respectively. The achieved SERS-activity optical fibre substrates were tested with Rhodamine 6G aqueous solutions. We demonstrate that the SERS activity coupled with Ag nano-dendrites optical fibre substrate has higher Raman enhancement factor due to the creation of many of hot-spots for amplifying Raman signals. Besides, the stability and reproducibility of the Ag nano-dendrites optical fibre substrate were also evaluated with stored time of 1000 hours and relative standard deviation of less than 3%. The Ag nano-dendrite optical fibre substrate was selected for detection of permethrin pesticide in the concentration range of 0.1 ppm–20 ppm with limit of quantification (LOQ) of 0.1 ppm and calculated limit of detection (LOD) of 0.0035 ppm, proving its great potential for direct, rapid detection and monitoring of permethrin.
Generalized Mohr-Coulomb strain criterion for bulk metallic glasses under complex compressive loading
Authors: Yu Li , Wang Tzu-Chiang
Published: August 2019

The Mohr-Coulomb (M-C) stress criterion is widely applied to describe the pressure sensitivity of bulk metallic glasses (BMGs). However, this criterion is incapable of predicting the variation in fracture angles under different loading modes. Moreover, the M-C criterion cannot describe the plastic fracture of BMGs under compressive loading because the nominal stress of most BMGs remains unchanged after the materials yield. Based on these limitations, we propose a new generalized M-C strain criterion and apply it to analyze the fracture behaviors of two typical Zr-based BMG round bar specimens under complex compressive loading. In this case, the predicted initial yielding stress is in good agreement with the experimental results. The theoretical results can also describe the critical shear strain and fracture angle of BMGs that are associated with the deformation mode.
Tumor inherent interferon regulators as biomarkers of long-term chemotherapeutic response in TNBC
Authors: Brockwell Natasha K. , Rautela Jai , Owen Katie L. , Gearing Linden J. , Deb Siddhartha , Harvey Kate , Spurling Alex , Zanker Damien , Chan Chia-Ling , Cumming Helen E. , Deng Niantao , Zakhour Jasmine M. , Duivenvoorden Hendrika M. , Robinson Tina , Harris Marion , White Michelle , Fox Jane , Ooi Corinne , Kumar Beena , Thomson Jacqui , Potasz Nicole , Swarbrick Alex , Hertzog Paul J. , Molloy Tim J. , Toole Sandra O’ , Ganju Vinod , Parker Belinda S.
Published: August 2019

Patients diagnosed with triple negative breast cancer (TNBC) have an increased risk of rapid metastasis compared to other subtypes. Predicting long-term survival post-chemotherapy in patients with TNBC is difficult, yet enhanced infiltration of tumor infiltrating lymphocytes (TILs) has been associated with therapeutic response and reduced risk of metastatic relapse. Immune biomarkers that predict the immune state of a tumor and risk of metastatic relapse pre- or mid-neoadjuvant chemotherapy are urgently needed to allow earlier implementation of alternate therapies that may reduce TNBC patient mortality. Utilizing a neoadjuvant chemotherapy trial where TNBC patients had sequential biopsies taken, we demonstrate that measurement of T-cell subsets and effector function, specifically CD45RO expression, throughout chemotherapy predicts risk of metastatic relapse. Furthermore, we identified the tumor inherent interferon regulatory factor IRF9 as a marker of active intratumoral type I and II interferon (IFN) signaling and reduced risk of distant relapse. Functional implications of tumor intrinsic IFN signaling were demonstrated using an immunocompetent mouse model of TNBC, where enhanced type I IFN signaling increased anti-tumor immunity and metastasis-free survival post-chemotherapy. Using two independent adjuvant cohorts we were able to validate loss of IRF9 as a poor prognostic biomarker pre-chemotherapy. Thus, IRF9 expression may offer early insight into TNBC patient prognosis and tumor heat, allowing for identification of patients that are unlikely to respond to chemotherapy alone and could benefit from further immune-based therapeutic intervention.
Long-term trapping of Stark-decelerated molecules
Authors: Haas Dominik , von Planta Claudio , Kierspel Thomas , Zhang Dongdong , Willitsch Stefan
Published: August 2019

Trapped cold molecules represent attractive systems for precision-spectroscopic studies and for investigations of cold collisions and chemical reactions. However, achieving their confinement for sufficiently long timescales remains a challenge. Here, we report the long-term trapping of Stark-decelerated OH radicals in their X2Π3/2 (ν = 0, J = 3/2, MJ = 3/2, f) state in a permanent magnetic trap. The trap environment is cryogenically cooled to a temperature of 17 K to suppress black-body-radiation-induced pumping of the molecules out of trappable quantum states and collisions with residual background gas molecules which usually limit the trap lifetime. The cold molecules are thus confined on timescales approaching minutes, an improvement of up to two orders of magnitude compared with room temperature experiments, at translational temperatures of ∼25 mK. The present results pave the way for new experiments using trapped cold molecules in precision spectroscopy, in studies of slow chemical processes at low energies and in the quantum technologies.
A fast-responding, highly sensitive detection system consisting of a fluorescent probe and palladium ions for N2H4 in environmental water and living cells
Authors: Cui Jie , Cao Lingzhi , Wang Guangshun , Ji Wenjia , Nie Hailiang , Yang Chunliu , Zhang Xiaoling
Published: August 2019

A rapid and sensitive system was constructed for detecting N2H4 in environmental water and living cells.
Order–disorder transition in the S = ½ kagome antiferromagnets claringbullite and barlowite
Authors: Henderson Alyssa , Dong Lianyang , Biswas Sananda , Revell Hannah I. , Xin Yan , Valenti Roser , Schlueter John A. , Siegrist Theo
Published: August 2019

STEM study of Cu kagome lattice in claringbullite.
Enantioselective organocatalytic activation of vinylidene–quinone methides (VQMs)
Authors: Rodriguez Jean , Bonne Damien
Published: August 2019

Vinylidene–quinone methides (VQMs) are highly electrophilic chiral reagents that can be generated in situ from 2-(phenylethynyl)phenols. Their specific reactivity has revealed innovative strategies notably for the control of axial chirality.
Molecular Transformer unifies reaction prediction and retrosynthesis across pharma chemical space
Authors: Lee Alpha A. , Yang Qingyi , Sresht Vishnu , Bolgar Peter , Hou Xinjun , Klug-McLeod Jacquelyn L. , Butler Christopher R.
Published: August 2019

We develop a machine learning model that tackles both reaction prediction and retrosynthesis by learning from the same dataset. The model is generalizable across chemical space.
Redox switchable catalysis utilizing a fluorescent dye
Authors: Thompson Brena L. , Simons Casey R. , Heiden Zachariah M.
Published: August 2019

This report describes the utilization of the redox-active nature of a BODIPY dye to generate a Rh-based catalyst that is capable of exhibiting redox switchable catalytic behavior for the hydroboration of alkenes through a BODIPY-based redox event.
Hydrogen-bonding-induced bathochromic effect of Si-coumarin and its use in monitoring adipogenic differentiation
Authors: Li Chen , Wang Ting , Li Ni , Li Min , Li Yuntao , Sun Yan , Tian Yang , Zhu Junru , Wu Yiqian , Zhang Dazhi , Cui Xiaoyan
Published: August 2019

Distortion of silicon in coumarin skeletons offers ultrahigh environment-sensitive fluorophores that show more than a 200 nm shift in different solvents.
A general strategy for development of a single benzene fluorophore with full-color-tunable, environmentally insensitive, and two-photon solid-state emission
Authors: Xiang Zhen , Wang Zhi-Yao , Ren Tian-Bing , Xu Wang , Liu Yu-Peng , Zhang Xing-Xing , Wu Peng , Yuan Lin , Zhang Xiao-Bing
Published: August 2019

We report here a single-benzene based fluorescent framework, amino-terephthalonitrile, denoted SB-Fluor.
Non-classical growth of brookite nanorods
Authors: Kolesnik Irina V. , Kozlov Daniil A. , Poluboyarinov Anton S. , Garshev Alexey V. , Ivanov Vladimir K.
Published: August 2019

Under hydrothermal conditions, the formation of the brookite phase occurs due to the oriented attachment of anatase particles with subsequent recrystallization.
Nanostructured silicon substrates of nanopore morphology for buffer-layer free nanoheteroepitaxial growth of InP films
Authors: Chin Alan H. , Gan Lin , Ning Cun-Zheng
Published: August 2019

Enhanced stress relief via nanopores.
Reflection high energy electron diffraction (RHEED) study of ice nucleation and growth on Ni(111): influences of adspecies and electron irradiation
Authors: Souda Ryutaro , Aizawa Takashi
Published: August 2019

Nucleation and growth processes of water ice on Ni(111) and how they are influenced by O and CO adspecies and electron irradiation are explored based on RHEED images.
A coarse-grained model of ionic liquid crystals: the effect of stoichiometry on the stability of the ionic nematic phase
Authors: Saielli Giacomo , Satoh Katsuhiko
Published: August 2019

The thermal range of the ionic nematic phase is strongly influenced by the stoichiometric composition of the [GB]n[LJ]msalt in mixtures of Gay-Berne and Lennard-Jones charged-particles.
Carrier recombination and transport dynamics in superstrate solar cells analyzed by modeling the intensity modulated photoresponses
Authors: Pereyra Carlos J. , Di Iorio Yesica , Berruet Mariana , Vazquez Marcela , Marotti Ricardo E.
Published: August 2019

Intensity modulated photovoltage and photocurrent spectroscopy data of CuInS2 solar cells were modeled and fitted with the solution of the continuity equation.
Anisotropic nanomaterials for shape-dependent physicochemical and biomedical applications
Authors: Yang Lijiao , Zhou Zijian , Song Jibin , Chen Xiaoyuan
Published: August 2019

This review is a systematic description of shape-dependent effects on nanomaterials from theory, synthesis, property to application, meanwhile, elaborates and predicts the properties and applications of nanoparticles with diverse morphologies in physicochemical and biomedical fields.
Development of and recent advances in asymmetric A3 coupling
Authors: Rokade Balaji V. , Barker James , Guiry Patrick J.
Published: August 2019

Asymmetric A3 coupling has emerged as an important class of reactions to synthesise chiral propargylamines.
Macroscopic assembly style of catalysts significantly determining their efficiency for converting CO2 to gasoline
Authors: Wang Xiaoxing , Yang Guohui , Zhang Junfeng , Song Faen , Wu Yingquan , Zhang Tao , Zhang Qingde , Tsubaki Noritatsu , Tan Yisheng
Published: August 2019

Efficient conversion of CO2 into high-quality gasoline is realized over a Fe–Zn–Zr and HZSM-5 core–shell catalyst.
Branched mannans from the mushroom Cantharellus cibarius enhance the anticancer activity of natural killer cells against human cancers of lung and colon
Authors: Lemieszek Marta K. , Nunes Fernando M. , Rzeski Wojciech
Published: August 2019

Cantharellus cibarius branched mannans increase natural killer cells NK92 viability and proliferation and enhance their cytotoxicity against lung and colon cancer cells A549 and LS180, at the same time they do not affect lung and colon epithelial cells NL20 and CCD841 CoN.
Buffering capacity of protein-based model food systems in the context of gastric digestion
Authors: Mennah-Govela Yamile A. , Singh R. Paul , Bornhorst Gail M.
Published: August 2019

A standardized method to measure and quantify buffering capacity in the context of gastric digestion is proposed and the impact of protein content and surface area on buffering capacity was observed.
The sustainable room temperature conversion of p-xylene to terephthalic acid using ozone and UV irradiation
Authors: Hwang Kuo Chu , Sagadevan Arunachalam , Kundu Pradip
Published: August 2019

p-Xylene was oxidatively converted to terephthalic acid at room temperature with ∼98% selectivity in the absence of any catalysts via ozone treatment with concurrent UV irradiation, without the production of global warming gases.
Selective ablation of biological tissue and single cells on a glass substrate by controlling the laser energy density of nanosecond 193 nm laser radiation
Authors: Van Acker Thibaut , Van Malderen Stijn J. M. , Colina-Vegas Legna , Ramachandran Ranjith K. , Vanhaecke Frank
Published: August 2019

This work demonstrates the ability of nanosecond 193 nm laser radiation to selectively ablate biological material on a glass substrate.
An ultra-rapid acoustic micromixer for synthesis of organic nanoparticles
Authors: Rasouli M. Reza , Tabrizian Maryam
Published: August 2019

This paper reports an ultra-rapid acoustic mixer by the integration of oscillatory bubbles and sharp edges as a versatile platform for nanoparticle synthesis.
Luminescent europium(iii) and terbium(iii) complexes of β-diketonate and substituted terpyridine ligands: synthesis, crystal structures and elucidation of energy transfer pathways
Authors: Abbas Zafar , Dasari Srikanth , Beltrán-Leiva María J. , Cantero-López Plinio , Páez-Hernández Dayán , Arratia-Pérez Ramiro , Butcher Ray J. , Patra Ashis K.
Published: August 2019

A series of coordinatively saturated LnIII complexes: [Ln(R-TPY)(TTA)3] (1–6) were designed and structurally characterized and plausible energy transfer (ET) pathways determined using a theoretical method.
Highly sensitive detection of the human papillomavirus E6 protein by DNA-protected silver nanoclusters and the intrinsic mechanism
Authors: Jia Xiang-Yu , Xue Ya-Rong , Zhang Chun-Xia , Luo Quan , Wu Yuqing
Published: August 2019

The present study not only supplies a good approach for the early diagnosis of HPV-related cancer but also enriches the biological application of AgNCs–dsDNA.
Water-soluble aluminium fluorescent sensor based on aggregation-induced emission enhancement
Authors: Nguyen Hanh Linh , Kumar Naresh , Audibert Jean-Frédéric , Ghasemi Rasta , Lefevre Jean-Pierre , Ha-Thi Minh-Huong , Mongin Cédric , Leray Isabelle
Published: August 2019

Development of a portable miniature system for Al(iii) detection in pure aqueous solutions using a novel AIEE compound.
Investigating the stability of molecule doped graphene field effect transistors
Authors: Wang Zegao , Liu Jingbo , Hao Xin , Wang Yin , Chen Yuanfu , Li Pingjian , Dong Mingdong
Published: August 2019

The electrical properties of PEI doped CVD-grown graphene transistors have been studied in detail, demonstrating that the absorbed PEI molecular will be modified by oxygen or water molecular during the exposure in ambient.
Eight out of eight: a detailed kinetic study on the reactivities of the eight hydroxyl groups of sucrose with phenyl isocyanate
Authors: Nagy Lajos , Vadkerti Bence , Batta Gyula , Fehér Péter Pál , Zsuga Miklós , Kéki Sándor
Published: August 2019

Three primary OH groups of sucrose were found to be the most reactive as confirmed by mass spectrometric and NMR methods.
Enhancing catalytic aerobic oxidation performance of cyclohexaneviasize regulation of mixed-valence {V16} cluster-based metal–organic frameworks
Authors: Wang Shuang , Sun Zhixia , Zou Xinyu , Zhang Zhijuan , Fu Guoyuan , Li Lei , Zhang Xue , Luo Fang
Published: August 2019

Size-controllable synthesis of mixed-valence {V16} cluster-based metal–organic frameworks used for highly efficient catalytic oxidation of cyclohexane.
Synthesis of polythiophene/graphite composites and their enhanced electrochemical performance for aluminum ion batteries
Authors: Zhao Shimeng , Chen Haixia , Li Jialin , Zhang Jianxin
Published: August 2019

The illustration of the electrochemical process for high capacity aluminum ion batteries based on polythiophene/graphite composite cathode materials.
The use of enaminones and enamines as effective synthons for MSA-catalyzed regioselective synthesis of 1,3,4-tri- and 1,3,4,5-tetrasubstituted pyrazoles
Authors: Duan Liancheng , Zhou Hui , Gu Yucheng , Gong Ping , Qin Mingze
Published: August 2019

In the present work, an efficient regioselective synthesis of 1,3,4-tri- and 1,3,4,5-tetrasubstituted pyrazoles via a methanesulfonic acid (MSA)-catalyzed reaction of hydrazones with enaminones or enamines is reported.
A novel electrochemical analysis of the legal psychoactive drug caffeine using a zeolite/MWCNT modified carbon paste sensor
Authors: Azab Shereen M. , Shehata M. , Fekry Amany M.
Published: August 2019

Caffeine (Caf) is a natural central nervous system stimulant categorized by the US Food and Drug Administration as a safe drug and its maximal amount in soft drinks has been approximately determined to be lower than 200 mg L−1.
Proteoliposomes as energy transferring nanomaterials: enhancing the spectral range of light-harvesting proteins using lipid-linked chromophores
Authors: Hancock Ashley M. , Meredith Sophie A. , Connell Simon D. , Jeuken Lars J. C. , Adams Peter G.
Published: August 2019

Self-assembled proteoliposomes allow highly efficient energy transfer from the spectrally-complementary chromophore Texas Red to the plant light-harvesting protein LHCII, increasing the effective absorption range of this bio-hybrid system.
Coordination polymer derived general synthesis of multi-shelled hollow metal oxides for lithium-ion batteries
Authors: Xue Dongyang , Xue Fangfang , Lin Xiaoping , Zong Fengyi , Zhang Jianmin , Li Qiuhong
Published: August 2019

A series of multi-shelled hollow metal oxide spheres were synthesized by a facile universal self-templated approach and ZnCo2O4 spheres exhibited excellent cycling durability and prominent rate capability.
The device level modulation of carrier transport in a 2D WSe2 field effect transistor via a plasma treatment
Authors: Moon Inyong , Lee Sungwon , Lee Myeongjin , Kim Changsik , Seol Daehee , Kim Yunseok , Kim Ki Hyun , Yeom Geun Young , Teherani James T. , Hone James , Yoo Won Jong
Published: August 2019

WSe2 FET oxidized by plasma. Channel resistance decreases exponentially with increasing WSe2 work function, approaching thermal limit.
A two-dimensional immunomagnetic nano-net for the efficient isolation of circulating tumor cells in whole blood
Authors: Lai Chian-Hui , Tsai Wen-Sy , Yang Muh-Hwa , Chou Teh-Ying , Chang Ying-Chih
Published: August 2019

An immunomagnetic morphable “nano-net” was designed and synthesized for specifically capturing rare cells of interest from mixtures.
Correction: Ionic-liquid-bifunctional wrapping of ultrafine SnO2 nanocrystals into N-doped graphene networks: high pseudocapacitive sodium storage and high-performance sodium-ion full cells
Authors: Yan Yang , Pan Zhen-Zhen , Wang Ying-Ying , Ma Yuan-Chuan , Li Chong , Lu Yu-Jun , Wu Xing-Long
Published: August 2019

Correction for ‘Ionic-liquid-bifunctional wrapping of ultrafine SnO2 nanocrystals into N-doped graphene networks: high pseudocapacitive sodium storage and high-performance sodium-ion full cells’ by Yan Yang et al., Nanoscale, 2019, 11, 14616–14624.
An asymmetric iminium ion catalysis-enabled cascade cycloaddition reaction of chromone-oxindole synthons with enals: construction of a spirooxindole–hexahydroxanthone framework
Authors: Zhang Wen-Hui , Zhou Yan-you , He Xue-Wen , Gong Yi , Liu Xiong-Li , Zhou Ying
Published: August 2019

We report the first asymmetric iminium ion catalysis-enabled cascade cycloaddition reaction of bifunctional chromone-oxindole synthons and α,β-unsaturated aldehydes.
Decorated single-enantiomer phosphoramide-based silica/magnetic nanocomposites for direct enantioseparation
Authors: Karimi Ahmadabad Fatemeh , Pourayoubi Mehrdad , Bakhshi Hadi
Published: August 2019

The nano-composites Fe3O4@SiO2@PTA(+) and Fe3O4@SiO2@PTA(−) (PTA: phosphoric triamide) were prepared and used for the chiral separation of five racemic mixtures.
Aminated β-cyclodextrin-grafted Fe3O4-loaded gambogic acid magnetic nanoparticles: preparation, characterization, and biological evaluation
Authors: Fang Wei , Dai Ya Ji , Wang Ting , Gao Hai Tao , Huang Peng , Yu Juan , Huang He Ping , Wang Dian Lei , Zong Wei Lu
Published: August 2019

Based on aminated β-cyclodextrin (6-NH2-β-CD)-grafted Fe3O4 and gambogic acid clathrate complexes, a nanoparticle delivery system was developed with the aim of achieving low irritation, strong targeting and high bioavailability of a gambogic acid magnetic nanopreparation.
Normal force of lithium-based magnetorheological grease under quasi-static shear with large deformation
Authors: Wang Huixing , Zhang Guang , Wang Jiong
Published: August 2019

An experimental study was conducted to explore the normal force of lithium-based magnetorheological (MR) grease under quasi-static shear.
Gallic acid-functionalized graphene hydrogel as adsorbent for removal of chromium (iii) and organic dye pollutants from tannery wastewater
Authors: Liu Gongyan , Yu Ruiquan , Lan Tianxiang , Liu Zheng , Zhang Peng , Liang Ruifeng
Published: August 2019

The formation process of gallic acid functionalized graphene hydrogel (GA-GH).
Access to indolines from primary phenylethylamines by an unexpected palladium-catalyzed C–H functionalization process
Authors: Mancinelli Andrea , Albert Joan , Ariza Xavier , Barrios Leoní A. , Garcia Jordi , Gómez Roberto , Granell Jaume
Published: August 2019

A new method for the preparation of 2,2-disubstituted indolines from 2-phenylethylamines was developed under Pd catalysis and PhI(OAc)2 as oxidant.
Kinetic evaluation of chitosan-derived catalysts for the aldol reaction in water
Authors: De Vylder Anton , Lauwaert Jeroen , De Clercq Jeriffa , Van Der Voort Pascal , Stevens Christian V. , Thybaut Joris W.
Published: August 2019

The reaction rate and stability of chitosan as heterogeneous amine catalyst is quantified in a batch and continuous-flow aldol reaction.
Extreme multi-point van der Waals interactions: isolable dimers of phthalocyanines substituted with pillar-like azaacenes
Authors: Saeki Hidenori , Sakamaki Daisuke , Fujiwara Hideki , Seki Shu
Published: August 2019

How strong are van der Waals interactions in determining the final outcome of self-assembled structures of small molecular systems?
Plasmon-promoted electrocatalytic water splitting on metal–semiconductor nanocomposites: the interfacial charge transfer and the real catalytic sites
Authors: Du Lili , Shi Guodong , Zhao Yaran , Chen Xiang , Sun Hongming , Liu Fangming , Cheng Fangyi , Xie Wei
Published: August 2019

The interfacial charge transfer and real catalytic sites on metal–semiconductor hybrid catalysts for photoelectrocatalytic water splitting are studied.
Ketoxime peptide ligations: oxidative couplings of alkoxyamines to N-aryl peptides
Authors: Guthrie Quibria A. E. , Young Hailey A. , Proulx Caroline
Published: August 2019

Ketoxime peptides are readily accessible from oxidative couplings between N-aryl peptides and alkoxyamines under catalyst-free conditions.
Fused octacyclic electron acceptor isomers for organic solar cells
Authors: Cai Guilong , Zhu Jingshuai , Xiao Yiqun , Li Mengyang , Liu Kuan , Wang Jiayu , Wang Wei , Lu Xinhui , Tang Zheng , Lian Jiarong , Zeng Pengju , Wang Yiping , Zhan Xiaowei
Published: August 2019

We synthesize 2 new isomeric fused-ring electron acceptors BTIC and NTIC. BTIC and NTIC-based organic solar cells show power conversion efficiencies of 11.5–12.2%.
Preparation of responsive bilayer membrane through morphological tuning of nano-scale building blocks
Authors: Gogoi Raj Kumar , Neog Arindom Bikash , Sarmah Neelam , Raidongia Kalyan
Published: August 2019

Fabrication of vanadium pentoxide-based responsive bilayer membranes through morphological tuning of the nanoscale building blocks.
A polyamine-independent role for S-adenosylmethionine decarboxylase
Authors: Li Bin , Kurihara Shin , Kim Sok Ho , Liang Jue , Michael Anthony J.
Published: August 2019

The only known function of S-adenosylmethionine decarboxylase (AdoMetDC) is to supply, with its partner aminopropyltransferase enzymes such as spermidine synthase (SpdSyn), the aminopropyl donor for polyamine biosynthesis. Polyamine spermidine is probably essential for the growth of all eukaryotes, most archaea and many bacteria. Two classes of AdoMetDC exist, the prokaryotic class 1a and 1b forms, and the eukaryotic class 2 enzyme, which is derived from an ancient fusion of two prokaryotic class 1b genes. Herein, we show that ‘eukaryotic' class 2 AdoMetDCs are found in bacteria and are enzymatically functional. However, the bacterial AdoMetDC class 2 genes are phylogenetically limited and were likely acquired from a eukaryotic source via transdomain horizontal gene transfer, consistent with the class 2 form of AdoMetDC being a eukaryotic invention. We found that some class 2 and thousands of class 1b AdoMetDC homologues are present in bacterial genomes that also encode a gene fusion of an N-terminal membrane protein of the Major Facilitator Superfamily (MFS) class of transporters and a C-terminal SpdSyn-like domain. Although these AdoMetDCs are enzymatically functional, spermidine is absent, and an entire fusion protein or its SpdSyn-like domain only, does not biochemically complement a SpdSyn deletion strain of E. coli. This suggests that the fusion protein aminopropylates a substrate other than putrescine, and has a role outside of polyamine biosynthesis. Another integral membrane protein found clustered with these genes is DUF350, which is also found in other gene clusters containing a homologue of the glutathionylspermidine synthetase family and occasionally other polyamine biosynthetic enzymes.
Histology and molecular pathology of iliotibial tract contracture in patients with gluteal muscle contracture
Authors: Yuan Bang-tuo , Qu Feng , Wang Shao-xia , Qi Wei , Shen Xue-zhen , Li Chun-bao , Liu Yu-jie
Published: August 2019

The present study aimed to examine the pathologic changes of the iliotibial tract and discusses its relationship with gluteal muscle contracture. Samples of contractual iliotibial tracts were collected from six patients with contractures of the gluteal muscles and iliotibial tracts during their surgical treatment. Samples of normal iliotibial tracts were collected from six patients receiving surgeries for avascular necrosis of the femoral head who had no contractures of the gluteal muscles and iliotibial tracts. The tissue samples were stained using Hematoxylin and Eosin (H&E), Masson’s trichrome, and Sirius Red. The mRNA and protein levels of various tissue repair genes were determined using quantitative real-time PCR and Western blotting. Both the normal and contractual iliotibial tracts consisted of type I and III collagens. The contractual iliotibial tracts had a significantly higher proportion of type III collagen in comparison with the normal iliotibial tracts. The mRNA expression levels and protein levels of tissue repair genes TGFβ 1, bFGF, and matrix metalloproteinase-1 (MMP-1) in the contractual iliotibial tracts were up-regulated in comparison with that in the normal iliotibial tracts. However, the mRNA expression levels and protein levels of tissue inhibitors of metalloproteinase-1 (TIMP) in the contractual iliotibial tracts were down-regulated in comparison with that in the normal iliotibial tracts. The contractures of both the gluteal muscles and the iliotibial tracts share similar histology and molecular pathology. Our results indicate that iliotibial tract contracture is secondary to the gluteal muscle contracture and is a constant tissue repair process.
Isorhamnetin inhibited migration and invasion via suppression of Akt/ERK-mediated epithelial-to-mesenchymal transition (EMT) in A549 human non-small-cell lung cancer cells
Authors: Luo Wei , Liu Qingbin , Jiang Nan , Li Mingquan , Shi Li
Published: August 2019

In the present study, we investigated the potential effects of Isorhamnetin on the growth and metastasis of A549 human lung cancer cells, as well as the underlying mechanism. Treatment with Isorhamnetin exhibited a dose- and time-dependent inhibition on A549 cell proliferation. Furthermore, the cell adhesion and Transwell assay showed that treatment with Isorhamnetin (2.5, 5, and 10 μM) for 48 h resulted in a significant inhibition effect on cell adhesion, invasion and migration of A549 cells, depending on concentration, which was associated with the suppression of matrix metalloproteinase (MMP)-2 and MMP-9 activity and protein expression. Moreover, Isorhamnetin effectively suppressed the expressions of epithelial-to-mesenchymal transition (EMT) markers, as evidenced by the down-regulation of N-cadherin, vimentin and snail, as well as up-regulation of E-cadherin protein expression. Additionally, these inhibitions were mediated by interrupting AKT/ERK1/2 signaling pathways. Taken together, the results of the current study demonstrated that Isorhamnetin may become a good anti-metastastic agent against lung cancer A549 cell line by the suppression of EMT via interrupting Akt/ERK1/2 signaling pathway.
Association of the vitamin D metabolism gene GC and CYP27B1 polymorphisms with cancer susceptibility: a meta-analysis and trial sequential analysis
Authors: Zhu Man , Tan Zheqiong , Luo Zhenzhao , Hu Hui , Wu Tangwei , Fang Shiqiang , Wang Hui , Lu Zhongxin
Published: August 2019

Nowadays, vitamin D is known to have functions beyond bone formation, including inhibiting angiogenesis and promoting tumor apoptosis. CYP27B1 and group-specific component (GC), the main enzyme responsible for the degradation and transport of active vitamin D, play important role in many cancer-related cellular processes. Relationships between CYP27B1 and GC polymorphisms and cancer susceptibility have been widely investigated, whereas the results are inconsistent. We strictly searched EMBASE, PubMed, Web of Science, WanFang and CNKI electronic databases for relevant studies exploring the associations of GC (rs4588 and rs7041) and CYP27B1 (rs4646537, rs3782130) polymorphisms with cancer risks according to search strategy. Thirty-two studies published in 13 articles involving 15713 cases and 17304 controls were included. Our analyses suggested that rs4588 and rs7041 polymorphisms were significantly associated with overall cancer risk. Stratification analyses of ethnicity indicated that rs4588 polymorphism significantly increased cancer risk in Caucasians and Asians, while rs7041 polymorphism significantly increased cancer risk in Asians. When studies were stratified by cancer type, our results indicated that rs4588 significantly increased the risk of breast cancer and digestive system tumor, but not in prostate cancer and non-small cell lung cancer, while rs7041 significantly increased the risk of non-small cell lung cancer. Above associations were noteworthy findings as evaluated by false-positive report probabilities (FPRPs). There were no associations of rs4646537 and rs3782130 with overall cancer risks. Associations between CYP27B1 and GC polymorphisms and cancer risks were examined, and additional large samples are necessary to validate our results.
Broadband vortex beam generating for multi‐polarisations based on a single‐layer quasi‐spiral metasurface
Authors: Wang Lingling , Liu Shaobin , Kong Xiangkun , Wen Yongdiao , Liu Xiaochun
Published: August 2019

A reflective metasurface based on the quasi‐spiral element is proposed to achieve broadband orbital angular momentum vortex beams for multi‐polarisations. The quasi‐spiral element can provide linear and smooth phase responses covering about 360° from 10 to 15 GHz with a relative bandwidth about 40% by adjusting the length of four phase delay lines. Additionally, the metasurface can generate vortex beams with optional charges in vertical, horizontal and circular polarisations which are determined by the polarisation of feed antenna. Finally,we have designed and fabricated a 24 × 24 cm2 metasurface prototype. The simulated and measured results show that the reflective metasurface can generate broadband vortex beams with orbital angular momentum effectively. As the structure is simple, lightweight and easy to fabricate, the proposed method is applicable to generate broadband vortex beams for multi‐polarisations.
Construction of optimal uniform constant composition codes
Authors: Bastos Gustavo Terra , Duarte‐González Mario E.
Published: August 2019

Uniform constant composition codes are particular cases of constant composition codes, where every symbol of the alphabet appears times in the codewords. A construction of optimal uniform constant composition codes with no restrictions over the alphabet is presented.
Effect of PI controllers’ parameters on machine‐network interaction of grid‐connected PMSG system
Authors: Habib Arslan , Aristizábal Andrés Julián , Arshad Adeel
Published: August 2019

In order to study the oscillation problem of grid‐connected permanent magnet direct drive wind power generation (PMSG) system, a small‐signal model of PMSG system based on PQ (active and reactive powers) decoupling control is established. All the oscillation modes of the system are found out, by using eigenvalue analysis and correlation factor analysis. The characteristic frequency and the dominant state variables of each oscillation mode are considered, the optimal parameter combination of proportional–integral (PI) controller is obtained by using the distribution estimation algorithm based on Copula theory. The time‐domain simulation of the MATLAB/Simulink platform verifies the existence of various modes of oscillation. The control parameters of the converter are changed in turn without changing the stability of the system, the subsynchronous control interaction; the subsynchronous oscillation and the low‐frequency oscillation mode of the system are studied. The modal analysis of the PMSG system model is carried out by using the optimal PI controller parameters, and the simulation results verify the correctness of the proposed model. This type of theoretical/practical approach has not been taken before to resolve the oscillation problems of grid‐connected PMSG.
Comprehensive small‐signal model and stability analysis of VSC‐based medium‐voltage DC distribution system
Authors: Gu Hanwen , Jiao Zaibin
Published: August 2019

DC distribution technology is emerging as a prospective form of future power system owing to its advantages such as high controllability and easy compatibility. In medium‐ or low‐voltage DC distribution systems, the two‐level voltage‐source converter (VSC) has become one of the preferred topologies for grid‐connected converters. A comprehensive small‐signal model for VSC‐based DC distribution systems, which takes into consideration the AC filter, DC distribution cables, and all the controllers in the VSC is presented in this study. Based on the ideal AC source, an absolutely stable synchronous rotating coordinate system is built to preclude the influence of the short circuit ratio of the AC system. The proposed model is verified using a detailed electromagnetic transient simulation carried out using power systems computer‐aided design (PSCAD). To analyse the impact of neglecting the AC filter and phase‐locked loop controller, two simplified models are established, and a detailed comparison of the three models is presented. The results indicate that when using the two simplified models, the time‐domain responses are significantly different from those in the PSCAD simulation and the obtained feasible domains of the control parameters tend to be either more optimistic or conservative. Thus, to carry out a small‐signal stability analysis, the use of the proposed comprehensive model is recommended to ensure the safety of the DC distribution system.
Control strategies to improve stability of LCC‐HVDC systems with multiple MMC taps
Authors: Liu Dalu , Kish Gregory J. , Pirooz Azad Sahar
Published: August 2019

High‐voltage direct current (HVDC) is a proven technology for grid integration of renewable energy sources such as offshore wind farms and interconnecting distributed systems to main power grids. One economical solution for electrifying rural communities is to extract a small amount of power from existing HVDC transmission lines with power electronic converters, which is called tapping. This study analyses the feasibility and system performance of parallel tapping line‐commutated converter (LCC)‐HVDC systems with multiple full‐bridge modular multilevel converters under various fault scenarios and operating conditions. Simulation results reveal that undesirable system disturbances such as DC‐link voltage sags, DC‐link current overshoots, and the transient reduction of inverter extinction angle are imposed on the LCC‐HVDC system in the case of tap station AC side faults. Such disturbances would endanger the reliable operation of the entire LCC‐HVDC system with the parallel taps. Furthermore, this study proposes two fault mitigating schemes, i.e. a tap station current modulation controller and three supplementary controller configurations, to reduce the impact of tap station AC side faults on the LCC‐HVDC system. Both fault mitigating schemes are controller‐based solutions, which are augmented to the existing controllers by utilising only local measurements. The proposed schemes are verified through simulations in PSCAD/EMTDC.
Super‐wideband multi‐input–multi‐output dielectric resonator antenna
Authors: Gotra Shailza , Varshney Gaurav , Pandey Vinay Shankar , Yaduvanshi Rajveer Singh
Published: August 2019

A half‐split inverted‐frustum shaped two‐port multi‐input–multi‐output (MIMO) dielectric resonator antenna is proposed with the ultra‐wideband response. The antenna provides the impedance bandwidth of 132.69% () with each port. The MIMO performance parameters like envelope correlation coefficient, diversity gain, mean effective gain and channel capacity loss remain in the acceptable limits with the isolation more than 20 dB throughout the operating band. In addition, the antenna provides the peak gain ranging from at port‐1 and at port‐2.
Circulation suppression of synchronous/interleaving paralleled 400 Hz three‐phase four‐leg inverter based on third harmonics injection
Authors: Chen Yihan , Guo Honghao , Ma Haixiao , Zhou Yan , Chen Jiawei
Published: August 2019

In this study, the third harmonic injection method based on analogue circuit is applied in the interleaving parallel three‐phase four‐leg (3P4L) inverter, the adverse effects of injected signals on the circulating current are found, and the corresponding control strategy solution is proposed. At the beginning of this study, by using the large‐signal model of leg, it is proved that four legs can be decoupled, on the basis of this conclusion, the current sharing control strategy based on dual‐loop scheme and third harmonic injection can be applied in paralleled 3P4L inverter, however, peak value of circulating current is increased by zero‐sequence component which is caused by injected signals. Therefore, output impedance analysis method is applied, and the control strategy including zero‐sequence component feedforward loop is proposed, which can be implemented with analogue circuit, and is suitable for the 400 Hz synchronous/interleaving paralleled inverter systems. Finally, the effectiveness of the control strategy is verified by simulation and experiment.
Discrete‐time integral terminal sliding mode based maximum power point controller for the PMSG‐based wind energy system
Authors: Yazıcı İrfan , Yaylacı Ersagun Kürşat
Published: August 2019

This study proposes a discrete‐time integral terminal sliding mode controller (DITSMC) integrated with a sensorless maximum power point tracking (MPPT) method for a permanent magnet synchronous generator (PMSG)‐based wind energy conversion system (WECS). The effects of the parameters of the proposed DITSMC on the convergence‐time and the error‐bound are investigated by the simulation studies. The dynamic performance of the DITSMC has been evaluated experimentally on a test bench for step‐type wind changes. The optimum coefficient between the output voltage of the generator and the extracted power from the WECS is determined only for a wind speed by offline studies. Then, the MPPT can be provided using this coefficient for all wind speeds in the operating range of the WECS without any mechanical sensor. Additionally, the experimental studies show that DITSMC has better performance than the PI controller in terms of the settling time and thus the efficiency of the WECS.
Considerations in the design of a low‐voltage power MOSFET technology
Authors: Rutter Phil
Published: August 2019

Discrete low‐voltage power metal‐oxide‐semiconductor field effect transistors are used in a wide variety of applications with each application relying on different aspects of device behaviour. The conflicting requirements of these applications along with constraints such as legislation, industrial base, and intellectual property have resulted in a diverse array of technologies available in the market. This study outlines the many considerations that are faced when designing a high‐performance silicon power MOSFET technology contrasting the trade‐offs involved as factors such as on‐state resistance, switching performance, reliability, and robustness in the application are optimised.
Solar PV and Grid Based Isolated Converter for Plug‐in Electric Vehicles
Authors: Singh Ankit Kumar , Chinmaya K.A. , Badoni Manoj
Published: August 2019

In this research work, a multipurpose power electronic interface (PEI) competent of utilising dual sources during charging process has been proposed for plug‐in electric vehicles. Based on the requirement, the battery can either be charged from solar photovoltaic (SPV) or from the grid. Moreover, when charged from an SPV source, converter can extract highest available power with maximum power point tracking (MPPT). The intrinsic novelty of the proposed PEI is that no additional components/switches are employed to achieve dual sources in charging or for MPPT. The proposed PEI consists of a converter derived from a conventional isolated secondary ended primary inductance converter (SEPIC). It is designed to operate effectively in all vehicular modes (charging, propulsion (PP) and regenerative braking (RB)). During battery charging from the grid and SPV, it operates as isolated SEPIC. While, in PP and RB, it operates as a flyback converter. Therefore, the proposed converter keeps isolation in each mode, which results in better safety for battery as well as vehicle users. Further, all vehicular modes are achieved through a single converter. As a result, compactness of the charger increases and making it best solution for on‐board battery charging application.
Cross‐layer routing protocol for event‐driven M2M communication in IoT‐assisted Smart City Planning and Management: CWSN‐eSCPM
Authors: Hosahalli Doreswamy , G. Srinivas Kunal
Published: August 2019

The robustness of wireless sensor networks (WSNs) has broadened the use of wireless communication systems for modern machine‐to‐machine (M2M) communication. Internet‐of‐Things (IoT) being one of the most explored technologies has gained wide attention due to low‐cost WSN communication systems. IoT is one of the dominant technologies used in Smart City implementation demands better communication paradigm including mobility assisted transmission paradigms; however, native IEEE 802.15.4 standard does not have mobility provision that limits its use for real‐time applications. On contrary, implementing mobility with classical WSN might impose significantly great topological changes and node or network condition variations which cannot be dealt with the traditional reactive routing approach. Incorporating node and/or network awareness with proactive network management can enable classical WSN to support mobility, which can be vital for IoT based Smart City Planning and Management (SCPM). With this motivation, in this study, a robust Cross‐Layer Architecture based WSN Routing Protocol for Event‐Driven M2M Communication in SCPM (CWSN‐eSCPM) is developed. CWSN‐eSCPM encompasses Proactive Node Management Strategy, Data‐Centric Service Differentiation and Fair Resource Scheduling (DCSDFRS), Packet Velocity Estimation, Cumulative Congestion Estimation, Dynamic Link Assessment that enables optimal Best Forwarding Node selection for deadline sensitive and reliable data communication. CWSN‐eSCPM applies dynamic link quality, cumulative congestion degree, and packet velocity of a node to enable optimal routing decision. DCSDFRS enables optimal resource provision to the real‐time data while assuring maximum possible resource for non‐real‐time data that assures Quality of Service provision for event‐driven critical communication in SCPM. Noticeably, CWSN‐eSCPM protocol has been applied on top of IEEE 802.15.4 protocol standard, while preserving backward compatibility feature, it can be used for WSN assisted communication purposes. The authors’ proposed protocol has performed better in terms of packet delivery ratio, packet loss ratio and deadline miss ratio for both real‐time data as well as non‐real‐time data.
Improvement of non‐linear chirp‐scaling algorithm for highly squint bistatic SAR data focusing
Authors: Li Yu , Duan Chongdi , Wang Weiwei , Yang Xiaochao , Yang Zhimei
Published: August 2019

Bistatic synthetic aperture radar (SAR) has specific advantages, e.g. weak targets detecting, reducing system vulnerability, and anti‐interference with low cost and flexible working modes. However, great challenges exist in data processing procedure due to its complicated geometry and 2‐D spatial variance, which become more serious when the squint angle increases. Here, an improved non‐linear chirp scaling method is proposed to handle highly squint bistatic SAR data. On one hand, Keystone transform is first performed, then linear range walk is removed to deduce the residual range cell migration correction factor, which is used for range compression and removing cross‐coupling terms. On the other hand, frequency modulation rates and high‐order phase based on the transmitter range offset (RO) and receiver RO are derived according to the geometric configuration. Simulation results show the effectiveness of the proposed algorithm.
Resource allocation of radar network based on particle swarm optimisation
Authors: Tian Lun , Liu Feifeng , Miao Yingjie , Li Ke , Liu Quahua
Published: August 2019

Resource allocation is one of the key problems in radar network. A modified particle swarm optimisation (PSO) algorithm is presented here to improve the performance of resource allocation in radar network with large baseline, where multiple tasks with multiple parameters were considered. First, the resource allocation mathematic model for radar network with large baseline was established. Second, based on modified PSO, the resource allocation algorithm is presented and it can simultaneously deal with both discrete and continuous variables. Finally, the simulation experiment is presented to verify the proposed algorithm. The simulation result suggested that the proposed algorithm is feasible and can satisfy the requirement of resource allocation in the radar network.