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https://www.readbyqxmd.com/read/28088119/composite-films-of-metal-doped-cos-carbon-allotropes-efficient-electrocatalyst-counter-electrodes-for-high-performance-quantum-dot-sensitized-solar-cells
#1
Seyede Sara Khalili, Hossein Dehghani, Malihe Afrooz
This study reports the enhanced catalytic ability of metal ions-doped CoS and CoS/carbon allotrope counter electrodes (CEs) (synthesized using a successive ionic layer adsorption and reaction (SILAR) method) to improve the power conversion efficiency (η) in quantum dot-sensitized solar cells (QDSSCs). Firstly, doping effects of different metal ions (Mg(2+), Ca(2+), Sr(2+) and Ba(2+)) in the CoS CE on the QDSSCs performance have been investigated. Overall, among the different metal doped CoS CEs, the best energy conversion efficiency of 2...
January 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088072/microstructural-mechanical-and-corrosion-characteristics-of-heat-treated-mg-1-2zn-0-5ca-wt-alloy-for-use-as-resorbable-bone-fixation-material
#2
Hamdy Ibrahim, Andrew D Klarner, Behrang Poorganji, David Dean, Alan A Luo, Mohammad Elahinia
Mg-Zn-Ca alloys have grabbed most of the recent attention in research attempting to develop an Mg alloy for bone fixation devices due to their superior biocompatibility. However, early resorption and insufficient strength remain the main problems that hinder their use. Heat treatment has previously been thoroughly studied as a post-shaping process, especially after the fabrication of complex parts (e.g. porous structures) by 3D-printing or powder metallurgy. In this work, the effect of heat treatment on Mg-1...
January 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28087107/establishment-of-the-2nd-korean-national-biological-reference-standard-for-blood-coagulation-factor-viii-c-concentrate
#3
Naery Lee, Ji Suk Seo, Jae Ok Kim, Sang Ja Ban
Since the 1st Korean national biological reference standard for factor (F)VIII concentrate, established in 2001, has shown declining potency, we conducted this study to replace this standard with a 2nd Korean national biological reference standard for blood coagulation FVIII concentrate. The candidate materials for the 2nd standard were prepared in 8000 vials with 10 IU/ml of target potency, according to the approved manufacturing process of blood coagulation Factor VIII:C Monoclonal Antibody-purified, Freeze-dried Human Blood Coagulation Factor VIII:C...
January 10, 2017: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/28086976/impact-of-a-tailored-program-on-the-implementation-of-evidence-based-recommendations-for-multimorbid-patients-with-polypharmacy-in-primary-care-practices-results-of-a-cluster-randomized-controlled-trial
#4
Cornelia Jäger, Tobias Freund, Jost Steinhäuser, Christian Stock, Johannes Krisam, Petra Kaufmann-Kolle, Michel Wensing, Joachim Szecsenyi
BACKGROUND: Multimorbid patients receiving polypharmacy represent a growing population at high risk for negative health outcomes. Tailoring is an approach of systematic intervention development taking account of previously identified determinants of practice. The aim of this study was to assess the effect of a tailored program to improve the implementation of three important processes of care for this patient group: (a) structured medication counseling including brown bag reviews, (b) the use of medication lists, and (c) structured medication reviews to reduce potentially inappropriate medication...
January 13, 2017: Implementation Science: IS
https://www.readbyqxmd.com/read/28086910/identifying-youth-friendly-service-practices-associated-with-adolescents-use-of-reproductive-healthcare-services-in-post-conflict-burundi-a-cross-sectional-study
#5
Imelda K Moise, Jaclyn F Verity, Joseph Kangmennaang
BACKGROUND: Very little is known about reproductive health service (RHS) availability and adolescents' use of these services in post-conflict settings. Such information is crucial for targeted community interventions that aim to improve quality delivery of RHS and outcomes in post-conflict settings. The objectives of this study therefore was to examine the density of RHS availability; assess spatial patterns of RHC facilities; and identify youth-friendly practices associated with adolescents' use of services in post-conflict Burundi...
January 13, 2017: International Journal of Health Geographics
https://www.readbyqxmd.com/read/28086905/reduction-of-eddy-current-losses-in-inductive-transmission-systems-with-ferrite-sheets
#6
Matthias Maaß, Andreas Griessner, Viktor Steixner, Clemens Zierhofer
BACKGROUND: Improvements in eddy current suppression are necessary to meet the demand for increasing miniaturization of inductively driven transmission systems in industrial and biomedical applications. The high magnetic permeability and the simultaneously low electrical conductivity of ferrite materials make them ideal candidates for shielding metallic surfaces. For systems like cochlear implants the transmission of data as well as energy over an inductive link is conducted within a well-defined parameter set...
January 5, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28081367/ordered-mesoporous-titanium-nitride-as-a-promising-carbon-free-cathode-for-aprotic-lithium-oxygen-batteries
#7
Byung Gon Kim, Changshin Jo, Jaeho Shin, Yeongdong Mun, Jinwoo Lee, Jang Wook Choi
Despite the extraordinary gravimetric energy densities, Li-O2 batteries are still facing a technological challenge; limited round trip efficiency leading to insufficient cycle life. Recently, carbonaceous electrode materials were found to be one of the primary origins of the limited cycle life, as they produce irreversible side products during discharge. A few investigations based on non-carbonaceous materials have demonstrated largely suppressed accumulation of irreversible side products but such studies have focused mainly on the materials themselves rather than delicate morphology control...
January 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28081363/distance-dependent-measurements-of-the-conductance-of-porphyrin-nanorods-studied-with-conductive-probe-atomic-force-microscopy
#8
Xianglin Zhai, Denzel Alexander, Pedro Derosa, Jayne C Garno
Protocols for nanopatterning porphyrins on Au(111) were developed based on immersion particle lithography. Porphyrins with and without a central metal ion, 5,10,15,20-tetraphenyl-21H,23H-porphyrin (TPP) and 5,10,15,20-tetraphenyl-21H,23H-porphyrin cobalt(II) (CoTPP) were selected for study, which spontaneously formed nanorod geometries depending on concentration parameters. The elongated shapes of the nanorods offers an opportunity for successive distance-dependent conductive probe-atomic force microscopy (CP-AFM) measurements along the length of the nanorods...
January 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28080070/solution-synthesis-of-iodine-doped-red-phosphorus-nanoparticles-for-lithium-ion-battery-anodes
#9
Wei-Chung Chang, Kuan-Wei Tseng, Hsing-Yu Tuan
Red Phosphorus (RP) is a promising anode material for lithium-ion battery due to its earth abundance and a high theoretical capacity of 2596 mA h g-1. Although RP-based anodes for lithium-ion batteries have been reported, they were all in the form of carbon/P composites, including P-graphene, P-graphite, P-CNTs and P-carbon black, in order to improve P's extremely low conductivity and large volume change during cycling process. Here we report the large-scale synthesis of red phosphorus nanoparticles (RPNPs) with sizes ranging from 100 to 200 nm by reacting PI3 with ethylene glycol in the presence of cetyltrimethylammonium bromide (CTAB) in ambient environment...
January 12, 2017: Nano Letters
https://www.readbyqxmd.com/read/28080022/single-wall-carbon-nanotubes-doping-in-lead-acid-batteries-a-new-horizon
#10
Anjan Banerjee, Baruch Ziv, Yuliya Shilina, Elena Levi, Shalom Luski, Doron Aurbach
The addition of single-wall carbon nanotubes (SWCNT) to lead-acid battery electrodes is the most efficient suppresser of uncontrolled sulfation processes. Due to the cost of SWCNT, we studied the optimization loading of SWCNT in lead-acid batteries electrodes. We optimized the SWCNT loading concentrations in both the positive and negative plates, separately. Loadings of 0.01% and 0.001% in the positive and negative active masses were studied, respectively. Two volts of lead-acid laboratory cells with sulfuric acid, containing silica gel-type electrolytes, were cycled in a 25% and 50% depth-of-discharge (DOD) cycling with a charging rate of C and 2C, respectively, and discharge rates of C/2 and C, respectively...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28079961/highly-porous-thermoelectric-nanocomposites-with-low-thermal-conductivity-and-high-figure-of-merit-from-large-scale-solution-synthesized-bi2-te2-5-se0-5-hollow-nanostructures
#11
Biao Xu, Tianli Feng, Matthias T Agne, Lin Zhou, Xiulin Ruan, G Jeffery Snyder, Yue Wu
To enhance the performance of thermoelectric materials and enable access to their widespread applications, it is beneficial yet challenging to synthesize hollow nanostructures in large quantities, with high porosity, low thermal conductivity (κ) and excellent figure of merit (z T). Herein we report a scalable (ca. 11.0 g per batch) and low-temperature colloidal processing route for Bi2 Te2.5 Se0.5 hollow nanostructures. They are sintered into porous, bulk nanocomposites (phi 10 mm×h 10 mm) with low κ (0...
January 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28079359/pristine-graphene-electrode-in-hydrogen-evolution-reaction
#12
Aozhen Xie, Ningning Xuan, Kun Ba, Zhengzong Sun
Graphene, the sp2 carbonaceous two dimensional (2D) material, is gaining more attentions in recent electrochemical studies. However, this atomic thick electrode usually suffers with surface contamination and poor electrochemical endurance. To overcome the drawbacks, we developed a PMMA-assisted, flipped transfer method to fabricate the graphene electrode with pristine surface and prolonged lifetime in hydrogen evolution reaction (HER). The HER performances of the single-layer graphene (SLG) were evaluated on various insulating and conductive substrates, including SiO2, polymers, SLG, highly oriented pyrolytic graphite (HOPG), and copper...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28079214/estimating-carrier-relaxation-times-in-the-ba8ga16ge30-clathrate-in-the-extrinsic-regime
#13
Robert L González-Romero, A Antonelli
We used a semi-empirical method to extract carrier relaxation times at different temperatures (τ(T)) in thermoelectric materials from a combination of experimental results and first-principles calculations. The methodology is based on the Boltzmann transport equation formalism within the relaxation time approximation. It can be applied to single crystals and polycrystalline materials. We applied the method to investigate the electronic transport properties of the clathrate compound Ba8Ga16Ge30 type-I. The calculations indicate that the carrier relaxation process in single crystals is dominated by electron-phonon scattering (τ ∝ T(-3/2)), while in polycrystalline materials scattering at grain boundaries dominates (τ ∼ cte)...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28079056/endurance-and-cycle-to-cycle-uniformity-improvement-in-tri-layered-ceo2-ti-ceo2-resistive-switching-devices-by-changing-top-electrode-material
#14
Anwar Manzoor Rana, Tahira Akbar, Muhammad Ismail, Ejaz Ahmad, Fayyaz Hussain, Ijaz Talib, Muhammad Imran, Khalid Mehmood, Khalid Iqbal, M Younus Nadeem
Resistance switching characteristics of CeO2/Ti/CeO2 tri-layered films sandwiched between Pt bottom electrode and two different top electrodes (Ti and TaN) with different work functions have been investigated. RRAM memory cells composed of TaN/CeO2/Ti/CeO2/Pt reveal better resistive switching performance instead of Ti/CeO2/Ti/CeO2/Pt memory stacks. As compared to the Ti/CeO2 interface, much better ability of TaN/CeO2 interface to store and exchange plays a key role in the RS performance improvement, including lower forming/SET voltages, large memory window (~10(2)) and no significant data degradation during endurance test of >10(4) switching cycles...
January 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28079027/the-properties-of-ultrapure-delafossite-metals
#15
A P Mackenzie
Although they were first synthesized in chemistry laboratories nearly fifty years ago, the physical properties of the metals PdCoO2, PtCoO2 and PdCrO2 have only more recently been studied in detail. The delafossite structure contains triangular co-ordinated atomic layers, and electrical transport in the delafossite metals is strongly 2D. Their most notable feature is their in-plane conductivity, which is amazingly high for oxide metals. At room temperature, the conductivity of non-magnetic PdCoO2 and PtCoO2 is higher per carrier than those of any alkali metal and even the most conductive elements, copper and silver...
January 12, 2017: Reports on Progress in Physics
https://www.readbyqxmd.com/read/28078802/evaluation-of-pva-biodegradable-electric-conductive-membranes-for-nerve-regeneration-in-axonotmesis-injuries-the-rat-sciatic-nerve-animal-model
#16
J Ribeiro, A R Caseiro, T Pereira, Pas Armada-da-Silva, I Pires, J Prada, I Amorim, I Leal Reis, S Amado, J D Santos, S Bompasso, S Raimondo, Asp Varejão, S Geuna, A L Luís, A C Maurício
The therapeutic effect of three polyvinyl alcohol (PVA) membranes loaded with electrically conductive materials - carbon nanotubes (PVA-CNTs) and polypyrrole (PVA-PPy) - were tested in vivo for neuro-muscular regeneration after an axonotmesis injury in the rat sciatic nerve. The membranes electrical conductivity measured was 1.5±0.5x10(-6) S/m, 579±0.6x10(-6) S/m, and 1837.5±0.7 x10(-6) S/m, respectively. At week-12, a residual motor and nociceptive deficit were present in all treated groups, but at week-12, a better recovery to normal gait pattern of the PVA-CNTs and PVA-PPy treated groups was observed...
January 12, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28078609/enhanced-thermophysical-properties-via-pao-superstructure
#17
Zahra Pournorouz, Amirhossein Mostafavi, Aditya Pinto, Apparao Bokka, Junha Jeon, Donghyun Shin
For the last few years, molten salt nanomaterials have attracted many scientists for their enhanced specific heat by doping a minute concentration of nanoparticles (up to 1% by weight). Likewise, enhancing the specific heat of liquid media is important in many aspects of engineering such as engine oil, coolant, and lubricant. However, such enhancement in specific heat was only observed for molten salts, yet other engineering fluids such as water, ethylene glycol, and oil have shown a decrease of specific heat with doped nanoparticles...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28078520/effects-of-screenhouse-cultivation-and-organic-materials-incorporation-on-global-warming-potential-in-rice-fields
#18
Guochun Xu, Xin Liu, Qiangsheng Wang, Ruiheng Xiong, Yuhao Hang
Global rice production will be increasingly challenged by providing healthy food for a growing population at minimal environmental cost. In this study, a 2-year field experiment was conducted to investigate the effects of a novel rice cultivation mode (screenhouse cultivation, SHC) and organic material (OM) incorporation (wheat straw and wheat straw-based biogas residue) on methane (CH4) and nitrous oxide (N2O) emissions and rice yields. In addition, the environmental factors and soil properties were also determined...
January 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28077741/is-using-a-latrine-a-strange-thing-to-do-a-mixed-methods-study-of-sanitation-preference-and-behaviors-in-rural-ethiopia
#19
Kristen Aiemjoy, Nicole E Stoller, Sintayehu Gebresillasie, Ayalew Shiferaw, Zerihun Tadesse, Tegene Sewent, Bezuayehu Ayele, Melsew Chanyalew, Solomon Aragie, Kelly Callahan, Aisha Stewart, Paul M Emerson, Thomas M Lietman, Jeremy D Keenan, Catherine E Oldenburg
Latrines are the most basic form of improved sanitation and are a common public health intervention. Understanding motivations for building and using latrines can help develop effective, sustainable latrine promotion programs. We conducted a mixed-methods study of latrine use in the Amhara region of Ethiopia. We held 15 focus group discussions and surveyed 278 households in five communities. We used the Integrated Behavioral Model for Water, Sanitation, and Hygiene interventions to guide our qualitative analysis...
January 11, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28076722/is-there-long-term-signal-intensity-increase-in-the-central-nervous-system-on-t1-weighted-images-after-mr-imaging-with-the-hepatospecific-contrast-agent-gadoxetic-acid-a-cross-sectional-study-in-91-patients
#20
Johannes Kahn, Helena Posch, Ingo G Steffen, Dominik Geisel, Christian Bauknecht, Thomas Liebig, Timm Denecke
Purpose To evaluate whether there is T1-weighted signal intensity (SI) increase in the dentate nucleus (DN) and globus pallidus (GP) in relation to the middle cerebellar peduncle (MCP), pons, and thalamus after repeated administration of the liver-specific contrast agent gadoxetic acid. Materials and Methods This was an institutional review board-approved, prospectively conducted (written informed consent acquired), cross-sectional study performed in a consecutively selected patient group (n = 91; patients received one to 37 doses of gadoxetic acid) and a control group (n = 52; subjects had never received injections of gadolinium-based contrast agent) examined with a standard T1-weighted two-dimensional spin-echo pulse sequence of the brain at 1...
January 11, 2017: Radiology
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