bluuebunny/crossref_metadata_2025 huggingface dataset:
MiR-708 promotes steroid-induced osteonecrosis of femoral head, suppresses osteogenic differentiation by targeting SMAD3
Authors: Hao Cheng , Yang Shuhua , Xu Weihua , Shen Jacson K. , Ye Shunan , Liu Xianzhe , Dong Zhe , Xiao Baojun , Feng Yong
Published: March 2016

Steroid-induced osteonecrosis of femoral head (ONFH) is a serious complication of glucocorticoid (GC) use. We investigated the differential expression of miRs in the mesenchymal stem cells (MSCs) of patients with ONFH, and aimed to explain the relationship between GC use and the development of MSC dysfunction in ONFH. Cells were collected from bone marrow of patients with ONFH. Samples were assigned to either GCs Group or Control Group at 1:1 matched with control. We then used miRNA microarray analysis and real-time PCR to identify the differentially expressed miRs. We also induced normal MSCs with GCs to verify the differential expression above. Subsequently, we selected some of the miRs for further studies, including miRNA target and pathway prediction, and functional analysis. We discovered that miR-708 was upregulated in ONFH patients and GC-treated MSCs. SMAD3 was identified as a direct target gene of miR-708, and functional analysis demonstrated that miR-708 could markedly suppress osteogenic differentiation and adipogenesis differentiation of MSCs. Inhibition of miR-708 rescued the suppressive effect of GC on osteonecrosis. Therefore, we determined that GC use resulted in overexpression of miR-708 in MSCs, and thus, targeting miR-708 may serve as a novel therapeutic biomarker for the prevention and treatment of ONFH.
A stable open-shell redox active ditopic ligand
Authors: Bonanno N. M. , Lough A. J. , Prosser K. E. , Walsby C. J. , Poddutoori P. K. , Lemaire M. T.
Published: March 2016

Herein we describe the synthesis, structure and electronic properties of an unusual redox-active ditopic ligand with a stable open-shell configuration.
Mass transport aspects of electrochemical solar-hydrogen generation
Authors: Modestino Miguel A. , Hashemi S. Mohammad H. , Haussener Sophia
Published: March 2016

The conception of practical solar-hydrogen generators requires the implementation of engineering design principles that allow photo-electrochemical material systems to operate efficiently, continuously and stably over their lifetime.
C,N-Chelated organotin(iv) azides: synthesis, structure and use within click chemistry
Authors: Švec Petr , Bartoš Karel , Růžičková Zdeňka , Cuřínová Petra , Dušek Libor , Turek Jan , De Proft Frank , Růžička Aleš
Published: March 2016

Novel organotin(iv) azides were employed as building blocks to prepare various organotin(iv) tetrazolides or triazolides.
Tunable blue–green–yellow emitting phosphor of Ba4Gd3Na3(PO4)6F2:Ce3+/Tb3+/Mn2+via energy transfer
Authors: Yu Haihui , Fu Xiaopeng , Kong Li , Lv Wei , Sun Xuhui , Liu Chunguang , Zhao Mingyue , Liang Ce , Liang He
Published: March 2016

We report new emission-tunable Ba4Gd3Na3(PO4)6F2:Ce3+/Tb3+/Mn2+ phosphors. By utilizing the ET of Ce3+ to Tb3+ and Ce3+ to Mn2+, the emitting colors can be adjusted from blue to green and from blue to yellow.
Comparison of sandwich and fingers-crossing type WO3/BiVO4 multilayer heterojunctions for photoelectrochemical water oxidation
Authors: Liu Cong , Su Jinzhan , Guo Liejin
Published: March 2016

Sandwich and fingers-crossing type WO3/BiVO4 multilayer heterojunctions were fabricated to investigate the influence of the junction structure on their photoelectrochemical performances.
Characteristics of estrogenic/antiestrogenic activities during the anoxic/aerobic biotreatment process of simulated textile dyeing wastewater
Authors: Liu Na , Xie Xuehui , Jiang Hong , Yang Fang , Yu Chengzhi , Liu Jianshe
Published: March 2016

HOA and HON were key fractions involved in increasing antiestrogenic activity and humic/fulvic acid in them could mask estrogenic activity.
Captodative substitution induced acceleration effect towards 4π electrocyclic ring-opening of substituted cyclobutenes
Authors: Sheikh Nadeem S.
Published: March 2016

Significance of quantum chemical calculations as a theoretical tool to identify the optimum substitution pattern for a rapid 4π electrocyclic ring-opening of substituted cyclobutenes is presented.
Improvement of the oxidation resistance of TiC-coated carbon black by high-temperature annealing in N2
Authors: Ye Jianke , Bao Ke , Wen Yan , Li Jiangtao
Published: March 2016

The annealing of TiC-coated carbon black in N2 at 1000–1300 °C resulted in formation of a TiCxNy solid solution and grain growth, which significantly increased the commencement and completion temperatures of carbon oxidation.
Understanding Au∼98Ag∼46(SR)60 nanoclusters through investigation of their electronic and local structure by X-ray absorption fine structure
Authors: Liu Jing , Krishna Katla Sai , Kumara Chanaka , Chattopadhyay Soma , Shibata Tomohiro , Dass Amala , Kumar Challa S. S. R.
Published: March 2016

Synchrotron radiation-based X-ray absorption fine structure (XAFS) of thiol-stabilized Au∼98Ag∼46(SR)60 nanoclusters suggests that Au atoms preferred to occupy the metal core sites while the Ag atoms were mainly on the surface.
Graphene quantum dots-decorated ZnS nanobelts with highly efficient photocatalytic performances
Authors: Ham Sooho , Kim Yeonho , Park Myung Jin , Hong Byung Hee , Jang Du-Jeon
Published: March 2016

Graphene quantum dots-embedded ZnS nanobelts showed 14-times higher photocatalytic activity than commercial ZnS.
Real time monitoring of aminothiol level in blood using a near-infrared dye assisted deep tissue fluorescence and photoacoustic bimodal imaging
Authors: Anees Palapuravan , Joseph James , Sreejith Sivaramapanicker , Menon Nishanth Venugopal , Kang Yuejun , Wing-Kwong Yu Sidney , Ajayaghosh Ayyappanpillai , Zhao Yanli
Published: March 2016

Real time monitoring of blood aminothiol level by a near-IR dye assisted fluorescence–photoacoustic bimodal imaging is reported.
Sensitive nitrite detection using a simple electrochemically aminated glassy carbon electrode
Authors: Wang Xiuyun , Cao Tingting , Zuo Qinglu , Wu Shuo , Uchiyama Shunichi , Matsuura Hiroaki
Published: March 2016

In this study, we demonstrate a sensitive nitrite detection method using a simple electrochemically aminated glassy carbon electrode (AGCE).
Flowerlike WSe2 and WS2 microspheres: one-pot synthesis, formation mechanism and application in heavy metal ion sequestration
Authors: Li Wei , Chen Dehong , Xia Fang , Tan Jeannie Z. Y. , Song Jingchao , Song Wei-Guo , Caruso Rachel A.
Published: March 2016

WSe2 and WS2 microspheres were synthesized by a solvothermal method and demonstrated outstanding uptake capacities for Pb2+ and Hg2+.
Ligand-controlled product selectivity in palladium-catalyzed domino post-Ugi construction of (spiro)polyheterocycles
Authors: Li Zhenghua , Sharma Nandini , Sharma Upendra K. , Jacobs Jeroen , Van Meervelt Luc , Van der Eycken Erik V.
Published: March 2016

Driven by a ligand: a phosphine ligand controlled regioselective divergence towards (spiro)polyheterocycles possessing two adjacent quaternary carbon stereocenters is described.
Dynamic foldamer chemistry
Authors: Le Bailly Bryden A. F. , Clayden Jonathan
Published: March 2016

Dynamic foldamers translate chemical signals into conformational changes, and hence into chemical outputs such as control of reactivity and selectivity.
Syntheses, structures, luminescence and magnetic properties of three high-nuclearity neodymium compounds based on mixed sulfonylcalix[4]arene-phosphonate ligands
Authors: Su Kongzhao , Jiang Feilong , Wu Mingyan , Qian Jinjie , Pang Jiandong , Yuan Daqiang , Hong Maochun
Published: March 2016

The solvothermal reactions of p-tert-butylsulfonylcalix[4]arene (H4BSC4A), phosphonic acid and neodymium chloride have resulted in three novel high-nuclearity neodymium coordination compounds.
Detection of trapped charges in the blend films of polystyrene/SFDBAO electrets by electrostatic and Kelvin probe force microscopy
Authors: Wang Jin , Wang Xiao , Xu Wen-Juan , Xie Ling-Hai , Liu Yu-Yu , Yi Ming-Dong , Huang Wei
Published: March 2016

The charge trapping properties of the blend of polystyrene (PS) and a sterically hindered organic semiconductor SFDBAO (spiro[fluorene-9,7-dibenzo[c,h]acridin-5-one]) are investigated by electrostatic and Kelvin probe force microscopy (EFM and KPFM).
Volume profile of α-chymotrypsin during adsorption and enzymatic reaction on a poly(acrylic acid) brush
Authors: Levin Artem , Erlkamp Mirko , Steitz Roland , Czeslik Claus
Published: March 2016

The catalytic rate of α-chymotrypsin that is adsorbed on a poly(acrylic acid) brush can be enhanced by pressure.
Competitive effects of oxygen vacancy formation and interfacial oxidation on an ultra-thin HfO2-based resistive switching memory: beyond filament and charge hopping models
Authors: Nakamura Hisao , Asai Yoshihiro
Published: March 2016

We studied the quantum transport mechanism of an ultra-thin HfO2-based resistive random access memory (ReRAM) cell with TiN electrodes and proposed the design of a sub-10 nm scale device.
Role of Cu, Ni and Co metals in the acidic and redox properties of Mo catalysts supported on Al2O3 spheres for glycerol conversion
Authors: Santos R. C. R. , Braga D. M. V. , Pinheiro A. N. , Leite E. R. , Freire V. N. , Longhinotti E. , Valentini A.
Published: March 2016

Promoters play an important role in the acidity and redox properties of Mo oxide catalysts supported on alumina spheres, and the catalytic performance reveals a potential effect between Cu and Mo oxides reduced partially, which improves the allyl alcohol selectivity.
Aryl(silyl)amino group stabilized hydridosilanediols: synthesis and characterization and use for preparation of alumino(hydrido)siloxanes
Authors: Wang Xiaoping , Li Jiancheng , Chen Shimin , Liu Weiping , Ye Qingsong , Zhu Hongping
Published: March 2016

Alumino(hydrido)siloxane [RSi(H)O2AlH(THF)]2 (R = N(SiMe2Ph)-2,6-iPr2C6H3), prepared from the reaction of RSiH(OH)2 and AlH3·NMe3 in THF under controlled temperature, shows an anchoring of the hydrido group on both the Si and Al atoms of the Si2O4Al2 framework.
Small molecule activation by mixed methyl/methylidene rare earth metal complexes
Authors: Hong Jianquan , Li Zhenhua , Chen Zhening , Weng Linhong , Zhou Xigeng , Zhang Lixin
Published: March 2016

Diverse reactivity patterns of mixed tetramethyl/methylidene rare-earth complexes bearing bulky benzamidinate coligands with PhCN, alkynes, and CS2 have been established and fully characterized.
Electrochemistry and catalytic properties of amphiphilic vitamin B12 derivatives in nonaqueous media
Authors: Giedyk M. , Shimakoshi H. , Goliszewska K. , Gryko D. , Hisaeda Y.
Published: March 2016

The reduction pathway of cobalester (CN)Cble, an amphiphilic vitamin B12 derivative, was investigated in organic solvents under electrochemical conditions and compared with mono- and dicyanocobyrinates.
Inactivation of urease by 1,4-benzoquinone: chemistry at the protein surface
Authors: Mazzei L. , Cianci M. , Musiani F. , Ciurli S.
Published: March 2016

The high activity of urease, a Ni(ii) enzyme, has several adverse effects on human health and agriculture, and its modulation needs the use of inhibitors.
The binding landscape of plasmepsin V and the implications for flap dynamics
Authors: L. McGillewie , Soliman Mahmoud E.
Published: March 2016

Plasmepsin V belongs to the plasmepsin family of aspartic proteases.
Design, synthesis and evaluation of novel tetrahydrothieno[3,2-c]pyridine derivatives as potent smoothened antagonists
Authors: Chen Xiaofeng , Sun Chiyu , Zhang Jingzhou , Ding Huaiwei , Song Hongrui
Published: March 2016

Compounds with this novel scaffold demonstrated promising Hh and Smo inhibition, indicating that this novel scaffold can serve as a starting point for further optimization.
Development of a transition metal-free polymerization route to functional conjugated polydiynes from a haloalkyne-based organic reaction
Authors: Zhang Yun , Zhao Engui , Deng Haiqin , Lam Jacky W. Y. , Tang Ben Zhong
Published: March 2016

Construction of functional polydiynes by transition metal-free homo-polycoupling of bis(iodoalkyne)s.
A pentacyclic building block containing an azepine-2,7-dione moiety for polymer solar cells
Authors: He Dan , Qian Liu , Ding Liming
Published: March 2016

A pentacyclic building block containing an azepine-2,7-dione moiety (TTA) was developed. PTTABDT:PC71BM solar cells gave a higher PCE of 5.46%, resulting from higherVocand ideal morphology.
Solid phase synthesis of TyrT, a thymine–tyrosine conjugate with poly(A) RNA-binding ability
Authors: Roviello Giovanni N. , Roviello Valentina , Autiero Ida , Saviano Michele
Published: March 2016

TyrT nucleoamino amide interacts with poly(A) RNA.
Reverse regioselectivity in Pd(0)/InI-mediated allylation of aldehydes with ε-amido-allylindiums generated from β-lactams. A new entry to non-racemic highly substituted γ-butyrolactones
Authors: Klimczak Urszula , Staszewska-Krajewska Olga , Zambroń Bartosz K.
Published: March 2016

ε-Amido-allylindiums generated from β-lactams in the presence of 2 eq. of InI, catalytic amounts of Pd(PPh3)4and 5 eq. of CF3CO2H react with a number of aromatic and aliphatic aldehydes to afford trisubstitutedγ-butyrolactones in high yield.
Phenol profiles and antioxidant capacities of Bistort Rhizoma (Polygonum bistorta L.) extracts
Authors: Wang Shao-Teng , Gao Wen , Fan Ya-Xi , Liu Xin-Guang , Liu Ke , Du Yuan , Wang Ling-Li , Li Hui-Jun , Li Ping , Yang Hua
Published: March 2016

This work demonstrated that the crude Bistort Rhizoma (BR) extracts exhibit an antioxidant effectiveness, which significantly correlated with the content of TP, showing that TP may be responsible for the antioxidant activity of BR extract.
Hemocompatible glutaminase freel-asparaginase from marine Bacillus tequilensis PV9W with anticancer potential modulating p53 expression
Authors: Shakambari Ganeshan , Birendranarayan Anand Kumar , Angelaa Lincy Maria Joseph , Rai Sameer Kumar , Ahamed Quazi Taushif , Ashokkumar Balasubramaniem , Saravanan Matheshwaran , Mahesh Ayyavu , Varalakshmi Perumal
Published: March 2016

Glutaminase freel-asparaginase from a marine isolateBacillus tequilensisPV9W: production, purification, characterization and its biological applications.
Direct access to non-aromatic 1,2,3,6-tetrahydro-1,2,3,4-tetrazines via [4 + 2] cycloaddition of α-halogeno hydrazones with azodicarboxylic acid derivatives
Authors: Zhao Hong-Wu , Pang Hai-Liang , Li Bo , Tian Ting , Chen Xiao-Qin , Song Xiu-Qing , Meng Wei , Yang Zhao , Liu Yue-Yang , Zhao Yu-Di
Published: March 2016

Construction of non-aromatic 1,2,3,6-tetrahydro-1,2,3,4-tetrazines through [4 + 2] cycloaddition of α-halogeno hydrazones with azodicarboxylic acid derivatives.
A radical coupling reaction of DMSO with sodium arylsulfinates in air : mild utilization of DMSO as C1 resource for the synthesis of arylsulfonyl dibromomethane
Authors: Shi Jie , Tang Xiao-Dong , Wu Yan-Cheng , Fang Jie-Fang , Cao Liang , Chen Xiao-Yun , Wang Zhao-Yang
Published: March 2016

A radical coupling reaction of DMSO with ArSO2Na without the needs of anaerobic atmosphere to afford ArSO2CHBr2 is described.
A bipolar electrochemiluminescence sensing platform based on pencil core and paper reservoirs
Authors: Lu Wen-Xiu , Bao Ning , Ding Shou-Nian
Published: March 2016

A very simple, portable and disposable BPE-ECL sensing platform has been investigated using commercial pencil core and paper cells.
Zn(ii) porphyrin based nano-/microscale metal–organic frameworks: morphology dependent sensitization and photocatalytic oxathiolane deprotection
Authors: Zhao Fang-Yao , Li Wen-Juan , Guo An , Chang Lan , Li Yue , Ruan Wen-Juan
Published: March 2016

Zn(ii) porphyrin based nano-/microscale MOFs showed morphology dependent 1O2 sensitization efficiency and were used as selective photocatalysts for oxathiolane deprotection.
A simple chemosensor for the dual-channel detection of cyanide in water with high selectivity and sensitivity
Authors: Cheng Xiao-Bin , Li Hui , Zheng Feng , Lin Qi , Yao Hong , Zhang You-Ming , Wei Tai-Bao
Published: March 2016

By a deprotonated mechanism, the simple chemosensorHYshowed high sensitivity and selectivity for cyanide in aqueous media.
Surface micromorphology and fractal geometry of Co/CP/X (X = Cu, Ti, SM and Ni) nanoflake electrocatalysts
Authors: Ţălu Ştefan , Solaymani Shahram , Bramowicz Miroslaw , Naseri Naimeh , Kulesza Slawomir , Ghaderi Atefeh
Published: March 2016

This paper analyses the three-dimensional (3-D) surface texture of Co/CP/X (X = Cu, Ti, SM and Ni, CP: carbonaceous paste) nanoflakes prepared electrochemically using a conventional three electrode system.
Direct energy harvesting from starch by hybrid enzymatic and non-enzymatic cascade bioanode
Authors: Wang Zonghua , Xia Lin , Xia Jianfei , An Zhendong , Gong Shida
Published: March 2016

A hybrid anode integrating enzymatic hydrolysis of starch by glucoamylase and non-enzymatic oxidation of glucose by gold nanoparticles is presented to achieve an efficient cascade energy conversion from starch.
Preparation of BaSnO3 and Ba0.96La0.04SnO3 by reactive core–shell precursor: formation process, CO sensitivity, electronic and optical properties analysis
Authors: Huang Chuande , Wang Xiaodong , Wang Xueyan , Liu Xin , Shi Quan , Pan Xiaoli , Li Xiaogan
Published: March 2016

A facile method for preparing pure and La doped BaSnO3 by reactive core–shell precursor was proposed and clear evidence of conduction band filling in La doped BaSnO3 was presented.
Design, synthesis and biological evaluation of novel triazole-core reversal agents against P-glycoprotein-mediated multidrug resistance
Authors: Zhang Bo , Zhao Tianxiao , Zhou Jie , Qiu Qianqian , Dai Yuxuan , Pan Miaobo , Huang Wenlong , Qian Hai
Published: March 2016

We designed and synthesized a novel series of P-glycoprotein (P-gp)-mediated multidrug resistance (MDR) inhibitors bearing a triazolphenethyl–tetrahydroisoquinoline scaffold through click chemistry.
The states of sulfate groups affect the mechanical and separation properties of carboxymethyl cellulose/chitosan complex membranes
Authors: Wu Jia-Kai , Wang Xue-San , Chen Kai-Fan , Zhou Guo-Jun , Li Xia , Xu Jian , An Quan-Fu
Published: March 2016

Two states of sulfate groups were dissected to affect mechanical and separation performances of PECMs prepared from CS and CMC.
Structure and bonding of IrB12−: converting a rigid boron B12 platelet to a Wankel motor
Authors: Liu Lei , Moreno Diego , Osorio Edison , Castro Abril C. , Pan Sudip , Chattaraj Pratim K. , Heine Thomas , Merino Gabriel
Published: March 2016

B12 is a rigid cluster with a high inner ring rotational energy barrier. However, doping it with Ir lowers the barrier significantly, transforming the IrB12− cluster in a Wankel motor.
Tuning the reaction rates of fluoride probes for detection in aqueous solution
Authors: Zheng Yueqin , Duan Yuqing , Ji Kaili , Wang Run-Ling , Wang Binghe
Published: March 2016

Tuning the reaction rates of fluoride probes for detection in aqueous solution by varying the pendent groups of probe molecules.
Correction: Towards a fine-tuning of surface chemistry in aligned carbon nanotubes induced by nitrogen plasma discharge post-treatment: a combined microscopic and spectroscopic study
Authors: Hussein Laith
Published: March 2016

Correction for ‘Towards a fine-tuning of surface chemistry in aligned carbon nanotubes induced by nitrogen plasma discharge post-treatment: a combined microscopic and spectroscopic study’ by Laith Hussein et al., RSC Adv., 2016, 6, 13088–13100.
Write on the edge: using a chemistry corpus to develop academic writing skills resources for undergraduate chemists
Authors: Bruce M. L. , Coffer P. K. , Rees S. , Robson J. M.
Published: March 2016

Many undergraduate students find the production of an extended piece of academic writing challenging. This challenge is more acute in the sciences where production of extended texts is infrequent throughout undergraduate studies. This paper reports the development of a new English for Academic Purposes (EAP) workshop and associated resources for third year undergraduate chemists to support their dissertation module. The workshop is designed to utilise a searchable database of student texts (a corpus) developed as part of the FOCUS project at Durham University. This novel use of data-driven learning (DDL), common in second language pedagogy, transfers well to the chemistry classroom as the processes of research and discovery (of words rather than chemicals) involved in DDL parallel similar processes in chemistry research. Our workshop and online consolidation activities have been positively evaluated by both staff and our current cohort of students. The project is being rolled out across other departments at Durham as well as the corpus tool being utilised at other UK HEIs. This corpus-based approach to academic writing in chemistry offers a unique perspective on the interplay between language and scientific literacy.
Enhancing photo-reduction quantum efficiency using quasi-type II core/shell quantum dots
Authors: Jia Yanyan , Chen Jinquan , Wu Kaifeng , Kaledin Alex , Musaev Djamaladdin G. , Xie Zhaoxiong , Lian Tianquan
Published: March 2016

Enhancing photoreduction quantum yield in core/shell QDs through an unexpectedly fast increase of hole removal rate with shell thickness.
Noble-metal-free Co3S4–S/G porous hybrids as an efficient electrocatalyst for oxygen reduction reaction
Authors: Gu Wenling , Hu Liuyong , Hong Wei , Jia Xiaofang , Li Jing , Wang Erkang
Published: March 2016

A high-efficiency noble-metal-free oxygen reduction reaction (ORR) catalyst was obtained based on the pyrolysis of the inexpensive precursor cobalt dithiolene (an S4-chelate complex) on simultaneously reduced graphene oxide (GO) as a support matrix.
Cationic pillar[6]arene/ATP host–guest recognition: selectivity, inhibition of ATP hydrolysis, and application in multidrug resistance treatment
Authors: Yu Guocan , Zhou Jiong , Shen Jie , Tang Guping , Huang Feihe
Published: March 2016

The efficacy of DOX·HCl against drug resistant human breast cancer cells is enhanced in the presence of a water-soluble pillar[6]arene (WP6) due to the inhibition of ATP hydrolysis upon formation of WP6⊃ATP in cells, providing a novel strategy to overcome multidrug resistance.
A high-rate cathode material hybridized by in-site grown Ni–Fe layered double hydroxides and carbon black nanoparticles
Authors: Chen Shuzhen , Mao Min , Liu Xi , Hong Shiyu , Lu Zhouguang , Sang Shangbin , Liu Kaiyu , Liu Hongtao
Published: March 2016

In-site grown 3D flower-like Ni–Fe layered double hydroxides and carbon black nanoparticles were hydrothermally hybridized and showed great potential as an alternative high-rate alkaline cathode.
The mechanism of toluene-assisted crystallization of organic–inorganic perovskites for highly efficient solar cells
Authors: Sakai Nobuya , Pathak Sandeep , Chen Hsin-Wei , Haghighirad Amir A. , Stranks Samuel D. , Miyasaka Tsutomu , Snaith Henry J.
Published: March 2016

We investigate the influence of solvent drenching in hybrid organic–inorganic perovskite (CH3NH3PbX) crystallization process with a non-solvent, toluene, during film fabrication process.
High-performance NaFePO4formed by aqueous ion-exchange and its mechanism for advanced sodium ion batteries
Authors: Tang Wei , Song Xiaohe , Du Yonghua , Peng Chengxin , Lin Ming , Xi Shibo , Tian Bingbing , Zheng Jiaxin , Wu Yuping , Pan Feng , Loh Kian Ping
Published: March 2016

Both fundamental understanding and practical demonstrations suggest that aqueous ion-exchanged NaFePO4is a promising cathode for organic sodium ion battery.
Good's buffer derived highly emissive carbon quantum dots: excellent biocompatible anticancer drug carrier
Authors: Samantara Aneeya K. , Maji Santanu , Ghosh Arnab , Bag Bamaprasad , Dash Rupesh , Jena Bikash Kumar
Published: March 2016

A facile one-step approach has been developed for the synthesis of carbon quantum dots (CQDs) from Good’s buffer.
Efficient polymer solar cells based on a new quinoxaline derivative with fluorinated phenyl side chain
Authors: Fan Qunping , Jiang Huanxiang , Liu Yu , Su Wenyan , Tan Hua , Wang Yafei , Yang Renqiang , Zhu Weiguo
Published: March 2016

A novel polymer PBDTT-DTFPQx based on a quinoxaline derivative with fluorinated phenyl side chain was synthesized, and the related PSCs showed a high PCE of 7.2% with an Voc of 0.87 V, Jsc of 11.4 mA cm−2 and FF of up to 73%.
Uncommon functional properties of the first piscine 26S proteasome from the Antarctic notothenioid Trematomus bernacchii
Authors: Gogliettino Marta , Balestrieri Marco , Riccio Alessia , Facchiano Angelo , Fusco Carmela , Palazzo Vincenzo Cecere , Rossi Mosè , Cocca Ennio , Palmieri Gianna
Published: March 2016

Protein homoeostasis is a fundamental process allowing the preservation of functional proteins and it has a great impact on the life of the Antarctic organisms. However, the effect of low temperatures on protein turnover is poorly understood and the cold-adaptation of the degradation machinery remains an unresolved issue. As the 26S proteasome represents the main proteolytic system devoted to the controlled degradation of intracellular proteins, the purpose of the present study was to investigate the functions of this complex in the notothenioid Trematomus bernacchii, in order to better understand its role in the physiology of Antarctic fish. To this aim, we purified and characterized the 26S proteasome from T. bernacchii and isolated the cDNAs codifying seven of the 14 subunits belonging to the proteasome 20S core particle. Results provided evidences of the high resistance of the piscine 26S proteasome to oxidative agents and of its ‘uncommon’ ability to efficiently hydrolyse oxidized bovine serum albumin (BSA), suggesting that this enzymatic complex could play a key role in the antioxidant defense systems in fish inhabiting permanently cold marine environments. These unique properties were also reflected by the 3D model analysis, which revealed a higher structural stability of the piscine complex respect to the murine template. Finally, a comparative analysis, performed in a variety of tissues collected from T. bernacchii and the temperate fish Dicentrarchus labrax, showed a lower protein retention in the cold-adapted fish, possibly due to a better efficiency of its degradation machinery.
Particle manipulation affected by streaming flows in vertically actuated open rectangular chambers
Authors: Agrawal Prashant , Gandhi Prasanna S. , Neild Adrian
Published: March 2016

Particle movement in vibration assisted microfluidic systems is significantly affected by time-averaged streaming flows. These flows can demonstrate either particle collection or dispersion characteristics, depending on the parameters used and system specifics. Here we investigate particle collection within streaming flows in vertically actuated open rectangular chambers at frequencies in the range of 100 Hz. Capillary waves, created at the water-air interface under the action of low frequency vibration, generate streaming fields in the liquid bulk. In addition, the spatial variation in the flow field gives rise to particle collection due to inertial effects. In order to understand the interplay between these effects, 2D simulations are employed to understand the first order field induced particle collection, while an experimental study is performed to investigate the effect of the 3D streaming fields on particle motion. By altering the chamber dimensions, two observations are presented: first by taking measures to reduce the strength of the streaming field, particles as small as 50 nm in diameter can be collected. Second, the streaming fields themselves can be used to trap particles, which in conjunction with the collection forces can cause particle separation.
Modeling the vertical motion of drops bouncing on a bounded fluid reservoir
Authors: Blanchette François
Published: March 2016

We present a first-principles model of drops bouncing on a liquid reservoir. We consider a nearly inviscid liquid reservoir and track the waves that develop in a bounded domain. Bouncing drops are modeled as vertical linear springs. We obtain an expression for the contact force between drop and liquid surface and a model where the only adjustable parameter is an effective viscosity used to describe the waves on the reservoir’s surface. With no adjustable parameters associated to the drop, we recover experimental bouncing times and restitution coefficients. We use our model to describe the effect of the Bond, Ohnesorge, and Weber numbers on drops bouncing on a stationary reservoir. We also use our model to describe drops bouncing on an oscillated reservoir, describing various bouncing modes and a walking threshold.
Instability in electromagnetically driven flows. I
Authors: Gissinger Christophe , Rodriguez Imazio Paola , Fauve Stephan
Published: March 2016

The magnetohydrodynamic flow driven by a travelling magnetic field in an annular channel is investigated numerically. For sufficiently large magnetic Reynolds number Rm, or if a large enough pressure gradient is externally applied, the system undergoes an instability in which the flow rate in the channel dramatically drops from synchronism with the wave to much smaller velocities. This transition takes the form of a saddle-node bifurcation for the time-averaged quantities. In this first paper, we characterize the bifurcation and study the stability of the flow as a function of several parameters. We show that the bifurcation of the flow involves a bistability between Poiseuille-like and Hartman-like regimes and relies on magnetic flux expulsion. Based on this observation, new predictions are made for the occurrence of this stalling instability.
Instability in electromagnetically driven flows. II
Authors: Rodriguez Imazio Paola , Gissinger Christophe
Published: March 2016

In a previous paper, we have reported numerical simulations of the magnetohydrodynamic flow driven by a travelling magnetic field in an annular channel, at low Reynolds number. It was shown that the stalling of such induction pump is strongly related to magnetic flux expulsion. In the present article, we show that for larger hydrodynamic Reynolds number, and with more realistic boundary conditions, this instability takes the form of a large axisymmetric vortex flow in the (r, z)-plane, in which the fluid is locally pumped in the direction opposite to the one of the magnetic field. Close to the marginal stability of this vortex flow, a low-frequency pulsation is generated. Finally, these results are compared to theoretical predictions and are discussed within the framework of experimental annular linear induction electromagnetic pumps.
Direct numerical simulation of statistically stationary and homogeneous shear turbulence and its relation to other shear flows
Authors: Sekimoto Atsushi , Dong Siwei , Jiménez Javier
Published: March 2016

Statistically stationary and homogeneous shear turbulence (SS-HST) is investigated by means of a new direct numerical simulation code, spectral in the two horizontal directions and compact-finite-differences in the direction of the shear. No remeshing is used to impose the shear-periodic boundary condition. The influence of the geometry of the computational box is explored. Since HST has no characteristic outer length scale and tends to fill the computational domain, long-term simulations of HST are “minimal” in the sense of containing on average only a few large-scale structures. It is found that the main limit is the spanwise box width, Lz, which sets the length and velocity scales of the turbulence, and that the two other box dimensions should be sufficiently large (Lx ≳ 2Lz, Ly ≳ Lz) to prevent other directions to be constrained as well. It is also found that very long boxes, Lx ≳ 2Ly, couple with the passing period of the shear-periodic boundary condition, and develop strong unphysical linearized bursts. Within those limits, the flow shows interesting similarities and differences with other shear flows, and in particular with the logarithmic layer of wall-bounded turbulence. They are explored in some detail. They include a self-sustaining process for large-scale streaks and quasi-periodic bursting. The bursting time scale is approximately universal, ∼20S−1, and the availability of two different bursting systems allows the growth of the bursts to be related with some confidence to the shearing of initially isotropic turbulence. It is concluded that SS-HST, conducted within the proper computational parameters, is a very promising system to study shear turbulence in general.
Indirect switching of vortex polarity through magnetic dynamic coupling
Authors: Fior G. B. M. , Novais E. R. P. , Sinnecker J. P. , Guimarães A. P. , Garcia F.
Published: March 2016

Magnetic vortex cores exhibit a gyrotropic motion and may reach a critical velocity, at which point they invert their z-component of the magnetization. We performed micromagnetic simulations to describe this vortex core polarity reversal in magnetic nanodisks with a perpendicular anisotropy. We found that the critical velocity decreases with the increase in perpendicular anisotropy, therefore departing from a universal criterion that relates this velocity only to the exchange stiffness of the material. This leads to a critical velocity inversely proportional to the vortex core radius. We have also shown that in a pair of interacting disks, it is possible to switch the core vortex polarity through a non-local excitation; exciting one disk by applying a rotating magnetic field, one is able to switch the polarity of a neighbor disk, with a larger perpendicular anisotropy.
Analysis of Cu(In,Ga)Se2 thin-film modules by electro-modulated luminescence
Authors: Huhn Vito , Gerber Andreas , Augarten Yael , Pieters Bart Elger , Rau Uwe
Published: March 2016

Thin-film Cu(In,Ga)Se2 modules are investigated by electro-modulated luminescence with bias illumination. The large signal analysis enables the determination of the average current density/voltage (J/V) characteristics of individual cell-stripes in a module, without contacting each individual cell. It was found that the characteristics determined from electro-modulated photo-luminescence measurements differ from the characteristics determined without bias illumination via electro-luminescence. As a reason for this, we found the non-linear relation of the local current to the local voltage which makes the determination of the cell voltage via an average of the local voltages determined from electro-luminescence images incorrect especially at high injection currents. A second analysis method using the small signal response of electro-modulated photo-luminescence was also analyzed. Recently, a method based on such a small signal analysis was demonstrated that yields the local photocurrent collection efficiency. This contribution presents the first application of this method to solar modules with series connected cells rather than the previously shown analysis of single cells. We compare two ways to evaluate the photocurrent collection efficiency from the small signal analysis and discuss how applicable these measurements are to modules. We find that the photocurrent collection efficiency of modules gives valuable information about how defective cells act within a module and which parts of the module limit the overall current through the module.
Uninterruptible smart house equipped with a single-phase dq-transformation system
Authors: Matayoshi Hidehito , Uehara Takahiro , Ludin Gul Ahmad , Sharma Aditya , Datta Manoj , Senjyu Tomonobu
Published: March 2016

This paper proposes an uninterruptible all-electric smart house equipped with photovoltaic system and storage battery. There is a control delay in the conventional control system, because the system uses root mean square or average values for the control method. Therefore, it causes transient currents when load variation and system faults occur. The transient current adversely affects the in-house loads (e.g., precision equipment). In this paper, the control delay is reduced by using a control system with single-phase dq-transformation information. Therefore, the smart house achieves a reduction of the transient current caused by load variation and system faults through the use of instantaneous inverter control. The effectiveness of the proposed method is verified by simulation results given by the Matlab/SimPowerSystems® environment.
Single-particle Lagrangian and structure statistics in kinematically simulated particle-laden turbulent flows
Authors: Murray S. , Lightstone M. F. , Tullis S.
Published: March 2016

Kinematic simulation (KS) is a means of generating a turbulent-like velocity field, in a manner that enforces a desired input Eulerian energy spectrum. Such models have also been applied in particle-laden flows, due to their ability to enforce spatial organization of the fluid velocity field when simulating the trajectories of individual Lagrangian particles. A critical evaluation of KS is presented; in particular, we examine its ability to reproduce single-particle Lagrangian statistics. Also the ability of KS to reproduce the preferential concentration of inertial particles is examined. Some computational results are presented, in which particles are transported alternatively by (1) turbulence generated by direct numerical simulation (DNS) of the incompressible Navier-Stokes equations, and (2) KS. The effect of unsteadiness formulation in particular is examined. We find that even steady KS qualitatively reproduces the continuity effect, clustering of inertial particles, the elevated dispersion of inertial particles over fluid particles, and the intermittency of Lagrangian velocity signals, but generally not to the same extent as is seen in the DNS.
Numerical simulations of superlattice patterns in dielectric barrier discharges at atmospheric pressure
Authors: Liu Fucheng , Wang Xiaofei , He Yafeng , Dong Lifang
Published: March 2016

This paper presents the numerical investigation on superlattice patterns in atmospheric pressure glow discharges in dielectric barrier discharges by using a self-consistent 2D fluid model. It is found that the superlattice pattern is an interleaving of two filamentary sub-patterns with alternate spatial and temporal characteristics. The competition between the volume ionization and the memory effects of both surface charges and space charges is expected to the formation mechanism of this superlattice pattern.
Activation of Si implants into InAs characterized by Raman scattering
Authors: Lind A. G. , Martin T. P. , Sorg V. C. , Kennon E. L. , Truong V. Q. , Aldridge H. L. , Hatem C. , Thompson M. O. , Jones K. S.
Published: March 2016

Studies of implant activation in InAs have not been reported presumably because of challenges associated with junction leakage. The activation of 20 keV, Si+ implants into lightly doped (001) p-type bulk InAs performed at 100 °C as a function of annealing time and temperature was measured via Raman scattering. Peak shift of the L+ coupled phonon-plasmon mode after annealing at 700 °C shows that active n-type doping levels ≈5 × 1019 cm−3 are possible for ion implanted Si in InAs. These values are comparable to the highest reported active carrier concentrations of 8–12 × 1019 cm−3 for growth-doped n-InAs. Raman scattering is shown to be a viable, non-contact technique to measure active carrier concentration in instances where contact–based methods such as Hall effect produce erroneous measurements or junction leakage prevents the measurement of shallow n+ layers, which cannot be effectively isolated from the bulk.
Porosity as a function of stoichiometry and implantation temperature in Ge/Si1−xGex alloys
Authors: Alkhaldi H. S. , Kremer F. , Bierschenk T. , Hansen J. L. , Nylandsted-Larsen A. , Williams J. S. , Ridgway M. C.
Published: March 2016

The development of porosity in single-crystal germanium and silicon-germanium alloys (c-Si1−x Gex) of (100) orientation was studied under bombardment with 140 keV Ge− ions over a wide range of temperatures (−180 to 400 °C) and ion fluences up to 1 × 1018 ions/cm2. The surface swelling and morphology were investigated using multi-characterization techniques including optical profilometry, transmission electron microscopy, and scanning electron microscopy. The initiation of porosity and the evolution of the near-surface microstructure strongly depend on the ion fluence, the irradiation temperature, and the stoichiometry of the substrate. Significant results and new findings include: (i) the fact that, over the entire temperature and stoichiometry range, porosity is only developed once the substrate is rendered amorphous; (ii) with increasing Si content in the alloy, the onset of porosity is pushed to higher fluences; (iii) porosity is observed for Si contents in the alloy up to 23% but not higher under the irradiation conditions used; and (iv) in all cases the initiation of porosity was observed to occur at the surface of the amorphous alloy above a threshold fluence. This last result strongly suggests that the mechanism for initiation of porosity is via preferential vacancy segregation and clustering at the surface of the amorphous alloy. Particularly at elevated temperatures, preferential sputtering of the Si-Ge atomic species in the alloy also plays an important role in developing the surface topography and porosity in alloys. Such effects are discussed along with the implications of our results for mechanisms of porosity in Ge and its alloys.
Quantum logic gates based on ballistic transport in graphene
Authors: Dragoman Daniela , Dragoman Mircea
Published: March 2016

The paper presents various configurations for the implementation of graphene-based Hadamard, C-phase, controlled-NOT, and Toffoli gates working at room temperature. These logic gates, essential for any quantum computing algorithm, involve ballistic graphene devices for qubit generation and processing and can be fabricated using existing nanolithographical techniques. All quantum gate configurations are based on the very large mean-free-paths of carriers in graphene at room temperature.
Combined AC electroosmosis and dielectrophoresis for controlled rotation of microparticles
Authors: Walid Rezanoor Md. , Dutta Prashanta
Published: March 2016

Electrorotation is widely used for characterization of biological cells and materials using a rotating electric field. Generally, multiphase AC electric fields and quadrupolar electrode configuration are needed to create a rotating electric field for electrorotation. In this study, we demonstrate a simple method to rotate dielectrophoretically trapped microparticles using a stationary AC electric field. Coplanar interdigitated electrodes are used to create a linearly polarized nonuniform AC electric field. This nonuniform electric field is employed for dielectrophoretic trapping of microparticles as well as for generating electroosmotic flow in the vicinity of the electrodes resulting in rotation of microparticles in a microfluidic device. The rotation of barium titanate microparticles is observed in 2-propanol and methanol solvent at a frequency below 1 kHz. A particle rotation rate as high as 240 revolutions per minute is observed. It is demonstrated that precise manipulation (both rotation rate and equilibrium position) of the particles is possible by controlling the frequency of the applied electric field. At low frequency range, the equilibrium positions of the microparticles are observed between the electrode edge and electrode center. This method of particle manipulation is different from electrorotation as it uses induced AC electroosmosis instead of electric torque as in the case of electrorotation. Moreover, it has been shown that a microparticle can be rotated along its own axis without any translational motion.
Sizing and economic analysis of gravity storage
Authors: Berrada A. , Loudiyi K. , Zorkani I.
Published: March 2016

Energy storage plays a key role in providing more flexibility and balancing to the electric grid. With the increasing penetration of renewable energy technologies, there is a need to instantaneously match demand with supply. Energy storage has the potential to provide a back-up to intermittent renewable energy by storing electricity for use during more valuable periods. At this time, there are limited storage options, because several technologies are at very early stage of development. Pumped hydro energy storage is currently the most widely installed technology. This form of storage has some drawbacks which include the technology siting, as it cannot be implemented everywhere. This paper presents a concept that is similar to the existing pumped hydro storage technology. This concept is known as gravity storage, as it stores electricity in the form of gravitational potential energy. This storage option provides better operating characteristics and economically sounds solution over conventional pumped hydro storage, and can be placed almost anywhere electricity storage is needed. This paper proposes a methodology to optimally size the gravity storage technology and avoid system design failure. It also presents an economic analysis to investigate the value of this storage option. This work identifies the leveled cost of gravity storage and compares it to similar storage options.
Enhanced refrigerant capacity in Gd-Al-Co microwires with a biphase nanocrystalline/amorphous structure
Authors: Shen H. X. , Xing D. W. , Sánchez Llamazares J. L. , Sánchez-Valdés C. F. , Belliveau H. , Wang H. , Qin F. X. , Liu Y. F. , Sun J. F. , Srikanth H. , Phan M. H.
Published: March 2016

A class of biphase nanocrystalline/amorphous Gd(50+5x)Al(30−5x)Co20 (x = 0, 1, 2) microwires fabricated directly by melt-extraction is reported. High resolution transmission electron microscopy and Fourier function transform based analysis indicate the presence of a volume fraction (∼20%) of ∼10 nm sized nanocrystallities uniformly embedded in an amorphous matrix. The microwires possess excellent magnetocaloric properties, with large values of the isothermal entropy change (−ΔSM ∼ 9.7 J kg−1 K−1), the adiabatic temperature change (ΔTad ∼ 5.2 K), and the refrigerant capacity (RC ∼ 654 J kg−1) for a field change of 5 T. The addition of Gd significantly alters TC while preserving large values of the ΔSM and RC. The nanocrystallites allow for enhanced RC as well as a broader operating temperature span of a magnetic bed for energy-efficient magnetic refrigeration.
Sidewall depletion in nano-patterned LAO/STO heterostructures
Authors: Minhas M. Z. , Blaschek H. H. , Heyroth F. , Schmidt G.
Published: March 2016

We have investigated the conductance of nanostructures fabricated from the quasi-two-dimensional electron gas (q2DEG) formed at the LaAlO3/ SrTiO3 (LAO/STO) interface. Measurements were done at room temperature and at T=4.2 K. Our findings show that the fully industry compatible nano-patterning process conserves the conductivity except for a small temperature dependent sidewall depletion which we attribute to etch damage induced by the dry etching process.
Irreversible magnetic processes under biaxial and uniaxial magnetic anisotropies
Authors: Pokharel S. , Akioya O. , Alqhtany N. H. , Dickens C. , Morgan W. , Wuttig M. , Lisfi A.
Published: March 2016

Irreversible magnetic processes have been investigated in magnetic systems with two different anisotropy symmetries (uniaxial and biaxial) through angular measurement of the switching field, the irreversible susceptibility and the magnetic viscosity. These two systems consist of two-dimensional cobalt ferrite hetero-structures epitaxially grown on (100) and (110) MgO substrate. It is found that for uniaxial anisotropy the irreversible characteristics of the magnetization are large and display a strong angular dependence, which exhibits its maximum at the easy axis and drops quickly to vanish at the hard axis. However, for biaxial anisotropy the magnetization irreversible characteristics are considerably reduced and are less sensitive to the field angle.