bluuebunny/crossref_metadata_2025 huggingface dataset:
Two-Layer Elastographic 3-D Traction Force Microscopy
Authors: Álvarez-González Begoña , Zhang Shun , Gómez-González Manuel , Meili Ruedi , Firtel Richard A. , Lasheras Juan C. , del Álamo Juan C.
Published: January 2017

Cellular traction force microscopy (TFM) requires knowledge of the mechanical properties of the substratum where the cells adhere to calculate cell-generated forces from measurements of substratum deformation. Polymer-based hydrogels are broadly used for TFM due to their linearly elastic behavior in the range of measured deformations. However, the calculated stresses, particularly their spatial patterns, can be highly sensitive to the substratum’s Poisson’s ratio. We present two-layer elastographic TFM (2LETFM), a method that allows for simultaneously measuring the Poisson’s ratio of the substratum while also determining the cell-generated forces. The new method exploits the analytical solution of the elastostatic equation and deformation measurements from two layers of the substratum. We perform an in silico analysis of 2LETFM concluding that this technique is robust with respect to TFM experimental parameters, and remains accurate even for noisy measurement data. We also provide experimental proof of principle of 2LETFM by simultaneously measuring the stresses exerted by migrating Physarum amoeboae on the surface of polyacrylamide substrata, and the Poisson’s ratio of the substrata. The 2LETFM method could be generalized to concurrently determine the mechanical properties and cell-generated forces in more physiologically relevant extracellular environments, opening new possibilities to study cell-matrix interactions.
Soybean cyclophilin GmCYP1 interacts with an isoflavonoid regulator GmMYB176
Authors: Mainali Hemanta Raj , Vadivel Arun Kumaran Anguraj , Li Xuyan , Gijzen Mark , Dhaubhadel Sangeeta
Published: January 2017

Cyclophilins (CYPs) belong to the immunophilin superfamily with peptidyl-prolyl cis-trans isomerase (PPIase) activity. They catalyze the interconversion of the cis- and trans-rotamers of the peptidyl-prolyl amide bond of peptides. A yeast-two-hybrid screening using the isoflavonoid regulator GmMYB176 as bait identified GmCYP1 as one of the interacting proteins in soybean embryos. GmCYP1 localizes both in the nucleus and cytoplasm, and interacts in planta with GmMYB176, in the nucleus, and with SGF14l (a soybean 14-3-3 protein) in the nucleus and the cytoplasm. GmCYP1 contains a single cyclophilin-like domain and displays a high sequence identity with other plant CYPs that are known to have stress-specific function. Tissue-specific expression of GmCYP1 revealed higher expression in developing seeds compared to other vegetative tissues, suggesting their seed-specific role. Furthermore, GmCYP1 transcript level was reduced in response to stress. Since isoflavonoids are involved in plant stress resistance against biotic and abiotic factors, the interaction of GmCYP1 with the isoflavonoid regulators GmMYB176 and 14-3-3 protein suggests its role in defense in soybean.
Correction: Corrigendum: IL-17 Promotes Angiogenic Factors IL-6, IL-8, and Vegf Production via Stat1 in Lung Adenocarcinoma
Authors: Huang Qi , Duan Iimin , Qian Xin , Fan Jinshuo , Lv Zhilei , Zhang Xiuxiu , Han Jieli , Wu Feng , Guo Mengfei , Hu Guorong , Du Jiao , Chen Caiyun , Jin Yang
Published: January 2017

Scientific Reports 6: Article number: 36551; published online: 07 November 2016 updated: 11 January 2017. This Article contains errors in the affiliations for Xin Qian, Jiao Du and Caiyun Chen, who were incorrectly listed as affiliated to “Department of Respiratory Medicine, Taihe Hospital, Hubei University of Medicine, No.
Heat-Related Hospitalizations in Older Adults: An Amplified Effect of the First Seasonal Heatwave
Authors: Liss Alexander , Wu Ruiruo , Chui Kenneth Kwan Ho , Naumova Elena N.
Published: January 2017

Older adults are highly vulnerable to the detriment of extreme weather. The rapid non-linear increase in heat-related morbidity is difficult to quantify, hindering the attribution of direct effects of exposure on severe health outcomes. We examine the effects of ambient temperatures on heat-related hospitalizations (HH) among the elderly in presence of strong seasonality and by assessing the effects caused by the first and subsequent seasonal heatwaves. We empirically derived the thresholds for a heatwave episode in Boston MSA based on 16 years of daily observations. We compared the health risks of heatwaves using the proposed and four alternative definitions. 701 cases of HH in older residents of Boston area were examined using harmonic regression models, designed to capture the non-linear effects of ambient temperatures and heatwave episodes when the night-time temperature is above 65.5 °F for 3 consecutive nights. The overall relative risk of HH associated with a heatwave episode was 6.9 [95%CI:4.8–9.8]. The relative risk of HH associated with the first heatwave increases up to 13.3 [95%CI:7.4–24.0]. The risk declined to 3.7 [95%CI:2.4–5.8] for the subsequent heatwave. Four other commonly used heatwave definitions confirmed these findings. Public health actions have to target the first heatwave to maximize the impact of preventive measures.
Regulation of plasma histamine levels by the mast cell clock and its modulation by stress
Authors: Nakamura Yuki , Ishimaru Kayoko , Shibata Shigenobu , Nakao Atsuhito
Published: January 2017

At steady state, plasma histamine levels exhibit circadian variations with nocturnal peaks, which is implicated in the nighttime exacerbation of allergic symptoms. However, the regulatory mechanisms are largely unexplored. This study determined how steady-state plasma histamine levels are regulated and affected by environmental factors. We found that plasma histamine levels decreased in mast cell–deficient mice and their circadian variations were lost in mast cell–deficient mice reconstituted with bone marrow–derived mast cells (BMMCs) harboring a mutation in the circadian gene Clock. Clock temporally regulates expression of organic cation transporter 3 (OCT3), which is involved in histamine transport, in mast cells; OCT inhibition abolished circadian variations in plasma histamine levels. Mice housed under aberrant light/dark conditions or suffering from restraint stress exhibited de-synchronization of the mast cell clockwork, concomitant with the loss of circadian variations in OCT3 expression and plasma histamine levels. The degree of compound 48/80–induced plasma extravasation in mice was correlated with plasma histamine levels. Collectively, the mast cell clock mediates circadian regulation of plasma histamine levels at steady state, in part by controlling OCT3 expression, which can be modulated by stress. Additionally, we propose that plasma histamine levels potentiate mast cell–mediated allergic reactions.
Live visualization of genomic loci with BiFC-TALE
Authors: Hu Huan , Zhang Hongmin , Wang Sheng , Ding Miao , An Hui , Hou Yingping , Yang Xiaojing , Wei Wensheng , Sun Yujie , Tang Chao
Published: January 2017

Tracking the dynamics of genomic loci is important for understanding the mechanisms of fundamental intracellular processes. However, fluorescent labeling and imaging of such loci in live cells have been challenging. One of the major reasons is the low signal-to-background ratio (SBR) of images mainly caused by the background fluorescence from diffuse full-length fluorescent proteins (FPs) in the living nucleus, hampering the application of live cell genomic labeling methods. Here, combining bimolecular fluorescence complementation (BiFC) and transcription activator-like effector (TALE) technologies, we developed a novel method for labeling genomic loci (BiFC-TALE), which largely reduces the background fluorescence level. Using BiFC-TALE, we demonstrated a significantly improved SBR by imaging telomeres and centromeres in living cells in comparison with the methods using full-length FP.
Herb pair Danggui-Honghua: mechanisms underlying blood stasis syndrome by system pharmacology approach
Authors: Yue Shi-Jun , Xin Lan-Ting , Fan Ya-Chu , Li Shu-Jiao , Tang Yu-Ping , Duan Jin-Ao , Guan Hua-Shi , Wang Chang-Yun
Published: January 2017

Herb pair Danggui-Honghua has been frequently used for treatment of blood stasis syndrome (BSS) in China, one of the most common clinical pathological syndromes in traditional Chinese medicine (TCM). However, its therapeutic mechanism has not been clearly elucidated. In the present study, a feasible system pharmacology model based on chemical, pharmacokinetic and pharmacological data was developed via network construction approach to clarify the mechanisms of this herb pair. Thirty-one active ingredients of Danggui-Honghua possessing favorable pharmacokinetic profiles and biological activities were selected, interacting with 42 BSS-related targets to provide potential synergistic therapeutic actions. Systematic analysis of the constructed networks revealed that these targets such as HMOX1, NOS2, NOS3, HIF1A and PTGS2 were mainly involved in TNF signaling pathway, HIF-1 signaling pathway, estrogen signaling pathway and neurotrophin signaling pathway. The contribution index of every active ingredient also indicated six compounds, including hydroxysafflor yellow A, safflor yellow A, safflor yellow B, Z-ligustilide, ferulic acid, and Z-butylidenephthalide, as the principal components of this herb pair. These results successfully explained the polypharmcological mechanisms underlying the efficiency of Danggui-Honghua for BSS treatment, and also probed into the potential novel therapeutic strategies for BSS in TCM.
A novel monoclonal antibody targeting coxsackie virus and adenovirus receptor inhibits tumor growth in vivo
Authors: Kawada Manabu , Inoue Hiroyuki , Kajikawa Masunori , Sugiura Masahito , Sakamoto Shuichi , Urano Sakiko , Karasawa Chigusa , Usami Ihomi , Futakuchi Mitsuru , Masuda Tohru
Published: January 2017

To create a new anti-tumor antibody, we conducted signal sequence trap by retrovirus-meditated expression method and identified coxsackie virus and adenovirus receptor (CXADR) as an appropriate target. We developed monoclonal antibodies against human CXADR and found that one antibody (6G10A) significantly inhibited the growth of subcutaneous as well as orthotopic xenografts of human prostate cancer cells in vivo. Furthermore, 6G10A also inhibited other cancer xenografts expressing CXADR, such as pancreatic and colorectal cancer cells. Knockdown and overexpression of CXADR confirmed the dependence of its anti-tumor activity on CXADR expression. Our studies of its action demonstrated that 6G10A exerted its anti-tumor activity primarily through both antibody-dependent cellular cytotoxicity and complement-dependent cytotoxicity. Moreover, 6G10A reacted with human tumor tissues, such as prostate, lung, and brain, each of which express CXADR. Although we need further evaluation of its reactivity and safety in human tissues, our results show that a novel anti-CXADR antibody may be a feasible candidate for cancer immunotherapy.
From an indirect response pharmacodynamic model towards a secondary signal model of dose-response relationship between exercise training and physical performance
Authors: Busso Thierry
Published: January 2017

The aim of this study was to test the suitability of using indirect responses for modeling the effects of physical training on performance. We formulated four different models assuming that increase in performance results of the transformation of a signal secondary to the primary stimulus which is the training dose. The models were designed to be used with experimental data with daily training amounts ascribed to input and performance measured at several dates ascribed to output. The models were tested using data obtained from six subjects who trained on a cycle ergometer over a 15-week period. The data fit for each subject was good for all of the models. Goodness-of-fit and consistency of parameter estimates favored the model that took into account the inhibition of production of training effect. This model produced an inverted-U shape graphic when plotting daily training dose against performance because of the effect of one training session on the cumulated effects of previous sessions. In conclusion, using secondary signal-dependent response provided a framework helpful for modeling training effect which could enhance the quantitative methods used to analyze how best to dose physical activity for athletic performance or healthy living.
“Mycobacterium massilipolynesiensis” sp. nov., a rapidly-growing mycobacterium of medical interest related to Mycobacterium phlei
Authors: Phelippeau M. , Asmar S. , Osman D. Aboubaker , Sassi M. , Robert C. , Michelle C. , Musso D. , Drancourt M.
Published: January 2017

In French Polynesia, respiratory tract clinical isolate M26, displayed unusual phenotype and contradictory phylogenetic affiliations, suggesting a hitherto unidentified rapidly-growing Mycobacterium species. The phenotype of strain M26 was further characterized and its genome sequenced. Strain M26 genome consists in a 5,732,017-bp circular chromosome with a G + C% of 67.54%, comprising 5,500 protein-coding genes and 52 RNA genes (including two copies of the 16 S rRNA gene). One region coding for a putative prophage was also predicted. An intriguing characteristic of strain M26’s genome is the large number of genes encoding polyketide synthases and nonribosomal peptide synthases. Phylogenomic analysis showed that strain M26’s genome is closest to the Mycobacterium phlei genome with a 76.6% average nucleotide identity. Comparative genomics of 33 Mycobacterium genomes yielded 361 genes unique to M26 strain which functional annotation revealed 84.21% of unknown function and 3.88% encoding lipid transport and metabolism; while 48.87% of genes absent in M26 strain have unknown function, 9.5% are implicated in transcription and 19% are implicated in transport and metabolism. Strain M26’s unique phenotypic and genomic characteristics indicate it is representative of a new species named “Mycobacterium massilipolynesiensis”. Looking for mycobacteria in remote areas allows for the discovery of new Mycobacterium species.
The influence of tip shape on bending force during needle insertion
Authors: van de Berg Nick J. , de Jong Tonke L. , van Gerwen Dennis J. , Dankelman Jenny , van den Dobbelsteen John J.
Published: January 2017

Steering of needles involves the planning and timely modifying of instrument-tissue force interactions to allow for controlled deflections during the insertion in tissue. In this work, the effect of tip shape on these forces was studied using 10 mm diameter needle tips. Six different tips were selected, including beveled and conical versions, with or without pre-bend or pre-curve. A six-degree-of-freedom force/torque sensor measured the loads during indentations in tissue simulants. The increased insertion (axial) and bending (radial) forces with insertion depth — the force-displacement slopes — were analyzed. Results showed that the ratio between radial and axial forces was not always proportional. This means that the tip load does not have a constant orientation, as is often assumed in mechanics-based steering models. For all tip types, the tip-load assumed a more radial orientation with increased axial load. This effect was larger for straight tips than for pre-bent or pre-curved tips. In addition, the force-displacement slopes were consistently higher for (1) increased tip angles, and for (2) beveled tips compared to conical tips. Needles with a bent or curved tip allow for an increased bending force and a decreased variability of the tip load vector orientation.
Ultrafast carrier dynamics in Ge by ultra-broadband mid-infrared probe spectroscopy
Authors: Yeh Tien-Tien , Shirai Hideto , Tu Chien-Ming , Fuji Takao , Kobayashi Takayoshi , Luo Chih-Wei
Published: January 2017

In this study, we carried out 800-nm pump and ultra-broadband mid-infrared (MIR) probe spectroscopy with high time-resolution (70 fs) in bulk Ge. By fitting the time-resolved difference reflection spectra [ΔR(ω)/R(ω)] with the Drude model in the 200–5000 cm−1 region, the time-dependent plasma frequency and scattering rate have been obtained. Through the calculation, we can further get the time-dependent photoexcited carrier concentration and carrier mobility. The Auger recombination essentially dominates the fast relaxation of photoexcited carriers within 100 ps followed by slow relaxation due to diffusion. Additionally, a novel oscillation feature is clearly found in time-resolved difference reflection spectra around 2000 cm−1 especially for high pump fluence, which is the Lorentz oscillation lasting for about 20 ps due to the Coulomb force exerted just after the excitation.
Understanding the molecular mechanism for the differential inhibitory activities of compounds against MTH1
Authors: Wang Mian , Zhou Shuilian , Chen Qing , Wang Lisheng , Liang Zhiqun , Wang Jianyi
Published: January 2017

MTH1 can hydrolyze oxidized nucleotides and is required for cancer survival. The IC50 values were 0.8 nM for TH287 with a methyl substitution, 5.0 nM for TH588 with a cyclopropyl substitution, and 2.1 μM for TH650 with an oxetanyl substitution. Thus, it is very significant to understand inhibitory mechanisms of these structurally similar compounds against MTH1 and influences of the substituent on the bioactivities. Our MD researches indicate that TH287 maintains significant hydrogen bonds with Asn33 and Asp119, stabilizes the binding site, and induces MTH1 adopt a closed motion, leading to a high inhibitory activity. When bound with TH588, the binding site can be partially stabilized and take a semi-closed state, which is because the cyclopropyl group in TH588 has larger steric hindrance than a methyl group in TH287. So TH588 has a slightly reduced inhibitory activity compared to TH287. TH650 induces greater conformation fluctuations than TH588 and the binding site adopts an opening state, which is caused by the large bulk of oxetanyl group and the interference of solvent on the oxetanyl substituent, leading to the lowest inhibitory activity. Thus, the inhibitory activity follows a TH287 > TH588 > TH650 trend, which well matches with the experimental finding.
Microscopic Evolution of Laboratory Volcanic Hybrid Earthquakes
Authors: Ghaffari H. O. , Griffith W. A. , Benson P. M.
Published: January 2017

Characterizing the interaction between fluids and microscopic defects is one of the long-standing challenges in understanding a broad range of cracking processes, in part because they are so difficult to study experimentally. We address this issue by reexamining records of emitted acoustic phonon events during rock mechanics experiments under wet and dry conditions. The frequency spectrum of these events provides direct information regarding the state of the system. Such events are typically subdivided into high frequency (HF) and low frequency (LF) events, whereas intermediate “Hybrid” events, have HF onsets followed by LF ringing. At a larger scale in volcanic terranes, hybrid events are used empirically to predict eruptions, but their ambiguous physical origin limits their diagnostic use. By studying acoustic phonon emissions from individual microcracking events we show that the onset of a secondary instability–related to the transition from HF to LF–occurs during the fast equilibration phase of the system, leading to sudden increase of fluid pressure in the process zone. As a result of this squeezing process, a secondary instability akin to the LF event occurs. This mechanism is consistent with observations of hybrid earthquakes.
The NAC-type transcription factor OsNAC2 regulates ABA-dependent genes and abiotic stress tolerance in rice
Authors: Shen Jiabin , Lv Bo , Luo Liqiong , He Jianmei , Mao Chanjuan , Xi Dandan , Ming Feng
Published: January 2017

Plants can perceive environmental changes and respond to external stressors. Here, we show thatOsNAC2, a member of the NAC transcription factor family, was strongly induced by ABA and osmotic stressors such as drought and high salt. With reduced yields under drought conditions at the flowering stage,OsNAC2overexpression lines had lower resistance to high salt and drought conditions. RNAi plants showed enhanced tolerance to high salinity and drought stress at both the vegetative and flowering stages. Furthermore, RNAi plants had improved yields after drought stress. A microarray assay indicated that many ABA-dependent stress-related genes were down-regulated inOsNAC2overexpression lines. We further confirmed thatOsNAC2directly binds the promoters ofLATE EMBRYOGENESIS ABUNDANT 3 (OsLEA3) andStress-Activated Protein Kinases 1 (OsSAPK1), two marker genes in the abiotic stress and ABA response pathways, respectively. Our results suggest that in riceOsNAC2regulates both abiotic stress responses and ABA-mediated responses, and acts at the junction between the ABA and abiotic stress pathways.
Characteristics of unilateral tibial plateau fractures among adult patients hospitalized at an orthopaedic trauma centre in China
Authors: Liu Yong , Liao Zhengwen , Shang Lei , Huang Wenhua , Zhang Dawei , Pei Guoxian
Published: January 2017

The aim of this study was to investigate the characteristics of unilateral tibial plateau fractures among hospitalized adult patients in Xijing Hospital, to evaluate the accuracy of Schatzker classification system and AO/OTA classification system to tibial plateau fractures. We retrospectively analysed clinical data on 274 patients admitted to Xijing Hospital between September 2006 and August 2015. The patients’ demographic characteristics, admission periods and seasons, external causes and fracture types were recorded and summarized. Then the characteristics of tibial plateau fractures and the accuracy rate of these two classification systems were analysed. Schatzker type II fractures and AO/OTA type 41-B3 fractures were the most common types. The external causes differed between genders, types of employment, urban-rural residents and both two systems. In addition, some fractures were difficult to classify using Schatzker or AO/OTA classification system. Rural male physical labourers aged between 30–59 years-old were most likely to suffer from unilateral tibial plateau fractures, due to traffic accidents, falls and indoor activity injuries, or falls from height. We should pay more attention to the related people and professions, which contributed to the high occurrence of tibial plateau fractures. Besides that, further improvements are required for both Schatzker and AO/OTA classification systems.
High definition infrared chemical imaging of colorectal tissue using a Spero QCL microscope
Authors: Bird B. , Rowlette J.
Published: January 2017

Mid-infrared microscopy has become a key technique in the field of biomedical science and spectroscopy. In this current study, we explore the use of a QCL infrared microscope to produce high definition, high throughput chemical images useful for the screening of biopsied colorectal tissue.
Access to thiopyrano[2,3-b]indole via tertiary amine-catalyzed formal (3+3) annulations of β′-acetoxy allenoates with indoline-2-thiones
Authors: Ni Chunjie , Zhang Yuwen , Hou Yading , Tong Xiaofeng
Published: January 2017

Amine-catalyzed formal (3+3) annulations of β′-acetoxy allenoates with indoline-2-thiones are described, which provide facile access to thiopyrano[2,3-b]indole.
Photoinduced charge recombination in dipolar D–A–A photonic liquid crystal polymorphs
Authors: Mazza Mercedes M. A. , Yamazaki Shiori , Mai Dieu X. , Padgaonkar Suyog , Peurifoy Samuel , Goncalves Ariane , Wu Yi-Lin , Hu Qiaoyu , Scott Amy M.
Published: January 2017

A hexylalkoxy dipolar D–A–A molecule has been synthesized and the photophysics studied via femtosecond transient absorption spectroscopy (FsTA) in toluene and in amorphous and liquid crystalline spherulite thin films.
A novel strategy for constructing mesoporous solid superbase catalysts: bimetallic Al–La oxides supported on SBA-15 modified with KF
Authors: Liu Ning , Wu Zhimin , Li Meng , Li Shanshan , Li Yongfei , Yu Rongdong , Pan Langsheng , Liu Yuejin
Published: January 2017

Bimetallic Al–La oxides were conjointly precoated on SBA-15 prior to the introduction of potassium fluoride to achieve solid superbases at low temperature by a modified wetness impregnation method.
Effect of the hydrothermal aging temperature and Cu/Al ratio on the hydrothermal stability of CuSSZ-13 catalysts for NH3-SCR
Authors: Han Shuai , Ye Qing , Cheng Shuiyuan , Kang Tianfang , Dai Hongxing
Published: January 2017

The effects of the hydrothermal aging temperature on the catalytic performance and stability of CuSSZ-13 catalysts with various Cu/Al ratios were studied.
Anion dependent self-assembly of sandwich 13-metal Ni–Ln nanoclusters with a long-chain Schiff base ligand
Authors: Wang Shiqing , Yang Xiaoping , Qian Jinjie , Li Qipeng , Chen Zhongning , Zhang Lijie , Huang Shaoming , Wang Chengri , Jones Richard A.
Published: January 2017

Two classes of magnetic Ni–Ln clusters with 7-metal cone-like and 13-metal sandwich architectures were constructed using a flexible long-chain Schiff base ligand.
Plutonium segregation in glassy aerodynamic fallout from a nuclear weapon test
Authors: Holliday K. S. , Dierken J. M. , Monroe M. L. , Fitzgerald M. A. , Marks N. E. , Gostic R. C. , Knight K. B. , Czerwinski K. R. , Hutcheon I. D. , McClory J. W.
Published: January 2017

This work establishes a connection between bulk composition and plutonium incorporation in glassy aerodynamic fallout from a nuclear weapon test.
Organometallic cobalamin anticancer derivatives for targeted prodrug delivery via transcobalamin-mediated uptake
Authors: Rossier Jeremie , Hauser Daniel , Kottelat Emmanuel , Rothen-Rutishauser Barbara , Zobi Fabio
Published: January 2017

We report the synthesis and study of new water-soluble vitamin B12 prodrugs bearing metal complexes at the β-upper side of the cobalt center for targeted prodrug delivery.
Hydrophenoxylation of internal alkynes catalysed with a heterobimetallic Cu-NHC/Au-NHC system
Authors: Lazreg Faïma , Guidone Stefano , Gómez-Herrera Alberto , Nahra Fady , Cazin Catherine S. J.
Published: January 2017

A dual catalytic process based on a heterobimetallic system, consisting of Cu-NHC and Au-NHC complexes, was shown to be highly active and selective for the hydrophenoxylation of internal alkynes.
A luminescent metal organic framework with high sensitivity for detecting and removing copper ions from simulated biological fluids
Authors: Zheng Tian-Tian , Zhao Jiao , Fang Zhou-Wen , Li Meng-Ting , Sun Chun-Yi , Li Xiao , Wang Xin-Long , Su Zhong-Min
Published: January 2017

Cd-MOF-74shows high sensitivity and efficiency in the detection and removal of copper ions from water and simulated biological fluids.
Modulated emission from dark triplet excitons in aza-acene compounds: fluorescence versus phosphorescence
Authors: Chen Jianwei , Chen Yi , Wu Yishi , Wang Xuedong , Yu Zhenyi , Xiao Lu , Liu Yanping , Tian He , Yao Jiannian , Fu Hongbing
Published: January 2017

The enhanced charge-transfer interaction from DBP to TBP leads to higher energy triplet states, which reinforces reverse intersystem crossing.
Iron antimonate quantum dots exhibiting tunable visible light emission
Authors: Nag Pratanu , Das Partha Pratim , Roy Anurag , Devi Parukuttyamma Sujatha
Published: January 2017

In this paper, we report for the first time tunable visible light emission from FeSbO4quantum dots prepared by an auto-combustion synthesis, a property hitherto unknown for this oxide.
Glycerol electro-oxidation in alkaline media using Pt and Pd catalysts electrodeposited on three-dimensional porous carbon electrodes
Authors: Arjona N. , Rivas S. , Álvarez-Contreras L. , Guerra-Balcázar M. , Ledesma-García J. , Kjeang Erik , Arriaga L. G.
Published: January 2017

Electrodeposition of Pd and Pt electrocatalysts on the entire structure of carbon paper and carbon nanofoam enhances the glycerol electro-oxidation.
Zwitterionic near infrared fluorescent agents for noninvasive real-time transcutaneous assessment of kidney function
Authors: Huang Jiaguo , Weinfurter Stefanie , Daniele Cristina , Perciaccante Rossana , Federica Rodeghiero , Della Ciana Leopoldo , Pill Johannes , Gretz Norbert
Published: January 2017

Zwitterionic near infrared fluorescent agents were developed for non-invasive real-time transcutaneous assessment of kidney function.
Designing strategies to tune reduction potential of organic molecules for sustainable high capacity battery application
Authors: Araujo Rafael B. , Banerjee Amitava , Panigrahi Puspamitra , Yang Li , Strømme Maria , Sjödin Martin , Araujo C. Moyses , Ahuja Rajeev
Published: January 2017

The framework of density functional theory has been applied to predict the formal potential of 137 molecules and identify promising candidates for the application as the organic electrode of rechargeable batteries.
Remarkable solvent isotope dependence on gelation strength in low molecular weight hydro-gelators
Authors: Canrinus Tjalling R. , Cerpentier Florian J. R. , Feringa Ben L. , Browne Wesley R.
Published: January 2017

Hydrophobic/hydrophilic, π–π stacking, ionic and hydrogen bond formation interactions determine the strength of hydrogelators and here solvent deuteration and electrolyte strength impact gel melting heavily.
Rapid evaporation-induced self-assembly of three-dimensional photonic crystals using Fe3O4@C magnetic nanocomposites
Authors: Li Meng , Cao Yuhua , Ni Xinjiong , Cao Guangqun
Published: January 2017

Three-dimensional photonic crystals with metallic luster were prepared rapidly via evaporation-induced self-assembly.
Weinreb amide directed cross-coupling reaction between electron-deficient alkenes catalyzed by a rhodium catalyst
Authors: Li Feifei , Yu Chunbing , Zhang Jian , Zhong Guofu
Published: January 2017

A rhodium-catalyzed Weinreb amide directed cross-coupling reaction between electron-deficient alkenes is reported, which provides an efficient route for the synthesis of valuable and versatile Weinreb amide functionalized (Z,E)-butadienes.
Synaptic behaviour in ZnO–rGO composites thin film memristor
Authors: Khanal G.M. , Acciarito S. , Cardarilli G.C. , Chakraborty A. , Nunzio L.D. , Fazzolari R. , Cristini A. , Re M. , Susi G.
Published: January 2017

A zinc oxide (ZnO)–reduced graphene oxide (rGO) composite thin film memristive device is reported. Further, it has been shown that it is possible to implement Hebbian learning rules like, the spike‐timing‐dependent plasticity, using this device. Furthermore, a circuit on PCB is developed; this circuit can imitate the biological spike firing scheme and activate the memristor synapse. The fabricated device along with the custom made circuit can be extended for developing future neuromorphic circuit applications.
Performance analysis of orthogonal frequency division multiplexing‐based cooperative amplify‐and‐forward networks with non‐linear power amplifier over independently but not necessarily identically distributed Nakagami‐m fading channels
Authors: Kumar Nagendra , Singya Praveen Kumar , Bhatia Vimal
Published: January 2017

In this study, performance analysis of variable‐gain amplify‐and‐forward relaying orthogonal frequency division multiplexing‐based systems over independently but not necessarily identically distributed Nakagami‐m fading channels using non‐linear power amplifier (PA) at the relay and maximal ratio combining scheme at destination. Specifically, novel closed‐form expressions of outage probability and asymptotic outage probability are investigated for the considered system model. Further, an average symbol error rate (ASER) expression is derived for general‐order rectangular quadrature amplitude modulation (RQAM) scheme using cumulative distribution function‐based approach, which is also the novel contribution of the work. Since the transfer function of PA used at relay is nonlinear, this introduces non‐linear distortion (NLD) in the considered system model. Thus, the impact of NLD and fading parameters on outage probability, diversity gain of the system and ASER performances are analysed. Further, the impact of NLD on constellation order for RQAM scheme is also discussed. The theoretical results are compared with computer simulations to verify the accuracy of the derivations. The derived expressions are generalised over variety of fading environments for integer‐valued fading parameter.
Periodic event‐triggered cooperative control of multiple non‐holonomic wheeled mobile robots
Authors: Chen Xia , Hao Fei , Ma Baoli
Published: January 2017

This study investigates the periodic event‐triggered control for the hand position centroid consensus/formation problems of multiple non‐holonomic wheeled mobile robots. By constructing invertible input transformation, the dynamics of the hand positions are formulated as two groups of first‐order integrators. Then, the event‐triggered control laws and the event conditions are proposed. On the basis of Lyapunov theory and the algebraic graph theory, permissible value ranges of the sampling period and the event condition parameters are established, guaranteeing that all the hand positions asymptotically tend to the common initial centroid location or the desired formation shape centred at the initial centroid. In addition, the orientations and the velocity inputs of each robot are ensured to reach some constants and zeros, respectively. Finally, simulations illustrate the efficiency of the proposed theoretical results.
Improved model‐predictive‐flux‐control strategy for three‐phase four‐switch inverter‐fed flux‐reversal permanent magnet machine drives
Authors: Hua Wei , Huang Wentao , Yu Feng
Published: January 2017

In this study, an improved model‐predictive‐flux‐control (MPFC) is developed and implemented based on a three‐phase flux‐reversal permanent magnet (FRPM) machine drives fed by three‐phase four‐switch voltage‐source‐inverter (TPFS‐VSI) with fewer switches and lower costs. The voltage variations and offsets across the two DC‐link capacitors in this kind of inverter topology are suppressed by deriving an analytical expression of the DC‐link capacitor voltages to reveal the inherent relationship between capacitor voltages and phase currents. In addition, the calculation process of the stator flux‐linkage vector reference is simplified by adopting the dq‐axes frame, and consequently, a precise predictive model is constructed for the stator flux‐linkage vector control. Then, both the steady and dynamic performances of the TPFS‐VSI‐fed FRPM machine under the developed MPFC are evaluated by simulations and experiments. Meanwhile, the inverter and machine losses of the FRPM machine driven system of TPFS‐ and TPSS‐VSI are measured for efficiency evaluation. The simulated and experimental results indicate that the developed MPFC not only offers the convergence of the DC‐link voltages fed by the TPFS‐VSI, but also improves the performance of the TPFS‐VSI‐fed FRPM machine drive in the low to medium speed applications.
Quantitative diagnosis of moisture content in oil‐paper condenser bushing insulation based on frequency domain spectroscopy and polarisation and depolarisation current
Authors: Liao Ruijing , Du Yongyong , Yang Lijun , Gao Jun
Published: January 2017

Dielectric response techniques have been proven useful for evaluating the moisture content (Km.c) of oil‐paper insulation. However, an accurate model for oil‐paper condenser bushing has not been presented. This study designed a laboratory oil‐impregnated paper (OIP) bushing model to simulate moistened defects in oil‐paper bushings. Moreover, a 10 kV OIP bushing model was simulated using COMSOL multiphysics AC/DC to confirm that the distribution of potential meets the design requirements. Furthermore, this work investigates the effect of moisture content on the dielectric frequency response and polarisation and depolarisation current (PDC) of models of oil‐paper bushings. A group of characteristic parameters was extracted from the dielectric dissipation factor curves and the DC conductivities of different moisture contents were computed by charge difference method from PDC curves. The obtained results suggest that the dissipation factor and the capacitance increase with the increase of moisture content in the whole frequency range, and the quantitative relationships among the characteristic parameters, DC conductivities, and the moisture content were established and follow an exponential law.
Analysis of Hopf bifurcation with forecast uncertainties in load/generation
Authors: Krishan Ram , Verma Ashu , Mishra Sukumar , Bijwe Pradeep R.
Published: January 2017

Eigenvalue analysis is a very essential technique for power system small‐signal stability (SSS) determination. Uncertainties in load/generation forecast are very common in power systems due to its geographical spread, size and complexity. These uncertainties can be divided into two types: (a) statistical (b) non‐statistical. It is observed from the literature that the effects of non‐statistical uncertainties in eigenvalue analysis are discussed comparatively less. In this study, a boundary eigenvalue analysis is developed based on boundary power flow to handle the non‐statistical uncertainties in loads and solar photovoltaic generation (SPVG) forecasts. First, mathematical model for evaluation of boundary of the critical eigenvalues for SSS analysis of dynamic power system (DPS) is developed. Then, the upper/lower boundary of a particular eigenvalue for a given range of uncertainties in load/SPVG at various buses is investigated. The boundary eigenvalue analysis predicts the worst‐case scenario for a given range of uncertainty in forecasted data which may help for secure operation of DPS. Second, Hopf bifurcations which may lead in highly stressed DPS is evaluated with increasing load/generation in the system in the presence of non‐statistical uncertainties. Results for two standard test systems are taken to demonstrate the potential of the proposed approach.
Effects of parameter variation in DFIG‐based grid connected system with a FACTS device for small‐signal stability analysis
Authors: Bhushan Ravi , Chatterjee Kalyan
Published: January 2017

For the last few decades, there has been rising concern across the globe about depletion of conventional energy sources and the consequent energy crisis. Simultaneously, search for other energy sources, such as wind energy and solar energy, has been gaining momentum as well. Particularly, wind energy has become a viable alternative source of energy. As the wind power penetration continually increases, stability of the grid‐connected doubly fed induction generator (DFIG)‐based wind turbine system has become essential for wind power generation. This study presents the influence of a grid‐side converter current dynamics on the small‐signal stability by using the eigenvalue and participation factor technique which provides five distinct system modes, namely mechanical (M), stator electrical, converter electrical, electro‐mechanical and non‐oscillatory mode. In addition, flexible alternating current transmission system device has been incorporated to examine its effect on the system stability at different compensation levels. Furthermore, the sensitivity of a grid‐connected DFIG system concerning system parameter variations and its impact on stability of the system modes has been investigated. Simulations have been carried out in the MATLAB/Simulink environment.
Development of control schemes for a cluster of PV‐integrated houses in islanded mode
Authors: Jha Rahul Ranjan , Srivastava Suresh Chandra , Kumar Mahesh
Published: January 2017

This study proposes the control schemes for the cluster of houses for power management in islanded mode. A centralised control scheme has been used in the cluster of the photovoltaic (PV)‐integrated houses. Each PV‐integrated house consists a battery energy storage system (BESS) connected through a bidirectional three‐phase voltage‐source converter (VSC). Control strategy for bidirectional three‐phase VSC to integrate the BESS to the AC network has also been proposed for controlling the charging/discharging of the BESS. The references used by the controller are detected by the charging or discharging of the battery. The algorithm has been developed to allow flow of power from one house to other house in islanded mode. Simulations are carried out to verify the robustness of the proposed control schemes under different operating conditions.
Enhanced utility‐scale photovoltaic units with frequency support functions and dynamic grid support for transmission systems
Authors: Hernández Jesus C. , Bueno Pedro G. , Sanchez‐Sutil Francisco
Published: January 2017

This research presents a model of a utility‐scale photovoltaic unit (USPVU) enhanced with an embedded hybrid energy storage system (HESS), suitable for stability studies in transmission systems. The main goal of this model is the simultaneous provision of primary frequency control and dynamic grid support. The primary frequency control includes both droop response (achieved by the frequency sensitive mode [FSM] operation) and inertial response (IR). To obtain these grid support functions, the research designed a suitable voltage and frequency (V–f) control, which coordinates the photovoltaic (PV) maximum power point tracking control, HESS converter control, and PV inverter control. Firstly, a midterm assessment of energy requirements in the sized HESS, based on frequency data, validated the energy availability of the enhanced USPVU for primary frequency control, according to new prequalification rules for energy‐constrained units. Then, transient stability assessments were performed on a representative transmission system to check the performance of the added FSM and IR in USPVUs with dynamic grid support. The results of the frequency phenomena in the IEEE 39‐bus system showed that the enhanced USPVU shared primary frequency control responsibilities with the conventional generation. This was achieved with two criteria to dispatch and commit conventional units by USPVUs.
Mobility‐aware route selection technique for mobile ad hoc networks
Authors: Sarkar Sajal , Datta Raja
Published: January 2017

In this study, the authors present a stable and reliable route selection technique based on the nodes’ mobility in mobile ad hoc networks. Here, a path is chosen for data routing that depends on some points that are computed based on a node's speed, direction and pause time. A trust module generates a threshold value to compare these points, which are known as the mobility_factor of a mobile node. Mobility_factor is used for selecting nodes to establish a path between source and destination nodes. They have carried out simulations of dynamic source routing (DSR) and ad hoc on‐demand distance vector (AODV) routing protocols using random Waypoint and Levy Walk mobility models with and without their proposed technique. Through simulation results we have shown that when used with our proposed mobility aware route selection technique, both of the protocols perform much better than the basic AODV and DSR. Also, the proposed protocols outperform the existing routing protocols, mobility aware routing protocol as well as mobility and load routing.
On the semi-global stabilizability of the Korteweg-de Vries Equationviamodel predictive control
Authors: Azmi Behzad , Boulanger Anne-Céline , Kunisch Karl
Published: January 2017

Stabilization of the nonlinear Korteweg-de Vries (KdV) equation on a bounded interval by model predictive control (MPC) is investigated. This MPC strategy does not need any terminal cost or terminal constraint to guarantee the stability. The semi-global stabilizability is the key condition. Based on this condition, the suboptimality and exponential stability of the model predictive control are investigated. Finally, numerical experiment is presented which validates the theoretical results.
Linear quadratic control problems of stochastic Volterra integral equations
Authors: Wang Tianxiao
Published: January 2017

This paper is concerned with linear quadratic control problems of stochastic differential equations (SDEs, in short) and stochastic Volterra integral equations (SVIEs, in short). Notice that for stochastic systems, the control weight in the cost functional is allowed to be indefinite. This feature is demonstrated here only by open-loop optimal controls but not limited to closed-loop optimal controls in the literature. As to linear quadratic problem of SDEs, some examples are given to point out the issues left by existing papers, and new characterizations of optimal controls are obtained in different manners. For the study of SVIEs with deterministic coefficients, a class of stochastic Fredholm−Volterra integral equations is introduced to replace conventional forward-backward SVIEs. Eventually, instead of using convex variation, we use spike variation to obtain some additional optimality conditions of linear quadratic problems for SVIEs.
The critical temperature as a function of the number of Cooper pairs, and the superconductivity mechanism in a layered LaSrCuO crystal
Authors: Pashitskii E. A.
Published: January 2017

It is shown that the square-root and linear dependence of the critical temperature Tc of the superconducting phase transition on the number of Cooper pairs in overdoped layered crystals La2−xSrxCu2O, observed in experiments conducted by Božović et al. [Nature 536, 309 (2016)], can be described by the BCS model for phonon and plasmon superconductivity mechanisms based on strong coupling effects.
Electron-stimulated desorption of excited atoms from solid nitrogen
Authors: Barabashov A. P. , Khyzhniy I. V. , Uyutnov S. A. , Bludov M. A. , Savchenko E. V.
Published: January 2017

The desorption of particles from the surface of solid nitrogen, stimulated by electrons having subthreshold energy, is studied in the atomic transition range using VUV fluorescent spectroscopy. Varying the energy of the electron beam allowed us to differentiate the inputs from the bulk and the sub-surface regions of the sample. Evidence of electron-stimulated desorption of excited nitrogen atoms and the mechanisms thereof are provided for the first time.