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Cycling performance

Sara Ehsani Majd, Aditya Iman Rizqy, Hans J Kaper, Tannin A Schmidt, Roel Kuijer, Prashant K Sharma
Active lifestyles increase the risk of meniscal injury. A permanent meniscus implant of polycarbonate urethane (PCU) is a promising treatment to postpone/prevent total knee arthroplasty. Study of the changes in articular cartilage tribology in the presence of PCU is essential in developing the optimum meniscus implant. Therefore, a cartilage-meniscus reciprocating, sliding model was developed in vitro, mimicking the stance and swing phases of the gait cycle. The meniscus was further replaced with PCU and surface-modified PCUs (with C18 chains, mono-functional polydimethylsiloxane groups and mono-functional polytetrafluoroethylene groups) to study the changes...
April 18, 2017: Colloids and Surfaces. B, Biointerfaces
Yuedan Wang, Xing Qing, Quan Zhou, Yang Zhang, Qiongzhen Liu, Ke Liu, Wenwen Wang, Mufang Li, Zhentan Lu, Yuanli Chen, Dong Wang
Novel woven fiber organic electrochemical transistors based on polypyrrole (PPy) nanowires and reduced graphene oxide (rGO) have been prepared. SEM revealed that the introduction of rGO nanosheets could induce the growth and increase the amount of PPy nanowires. Moreover, it could enhance the electrical performance of fiber transistors. The hybrid transistors showed high on/off ratio of 10(2), fast switch speed, and long cycling stability. The glucose sensors based on the fiber organic electrochemical transistors have also been investigated, which exhibited outstanding sensitivity, as high as 0...
April 14, 2017: Biosensors & Bioelectronics
Quoc V Le, Sina Abhari, Omar M Abuzeid, Jennifer DeAnna, Mohamed A Satti, Tarek Abozaid, Iqbal Khan, Mostafa I Abuzeid
OBJECTIVE: To describe pregnancy outcomes of frozen-thawed blastocysts cycles using modified natural cycle frozen embryo transfers (NC-FET) and down-regulated hormonally controlled frozen embryo transfers (HC-FET) protocols. STUDY DESIGN: This retrospective cohort study included all patients undergoing either modified NC-FET or down-regulated HC-FET using frozen-thawed day 5 embryos. Cycles with donor blastocysts were excluded. Four hundred twenty eight patients underwent a total of 493 FET cycles...
April 6, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
C Ross Schmidtlein, Yizun Lin, Si Li, Andrzej Krol, Bradley J Beattie, John L Humm, Yuesheng Xu
PURPOSE: Performance of the preconditioned alternating projection algorithm (PAPA) using relaxed ordered subsets (ROS) with a non-smooth penalty function was investigated in positron emission tomography (PET). A higher order total variation (HOTV) regularizer was applied and a method for unsupervised selection of penalty weights based on the measured data is introduced. METHODS: A ROS version of PAPA with HOTV penalty (ROS-HOTV-PAPA) for PET image reconstruction was developed and implemented...
April 24, 2017: Medical Physics
Ruolin Wang, Shouren Lin, Yong Wang, Weiping Qian, Liang Zhou
OBJECTIVE: To evaluate the effectiveness and safety of gonadotropin-releasing hormone antagonist (GnRH-ant) protocol and gonadotropin-releasing hormone agonist (GnRH-a) long protocol in patients with normal ovarian reserve. METHODS: We searched the PubMed (1992-2016), Cochrane Library (1999-2016), Web of Science (1950-2016), Chinese Biomedical Database (CBM, 1979-2016), and China National Knowledge Infrastructure (CNKI, 1994-2016). Any randomized controlled trials (RCTs) that compared GnRH-ant protocol and GnRH-a long protocol in patients with normal ovarian reserve were included, and data were extracted independently by two reviewers...
2017: PloS One
Michael Reichl, Rebecca A Kueny, Reza Danyali, Peter Obid, Hüseyin Übeyli, Klaus Püschel, Michael M Morlock, Gerd Huber, Thomas Niemeyer, Alexander Richter
STUDY DESIGN: Biomechanical ex vivo study. OBJECTIVE: To determine if topping off instrumentation can reduce the hypermobility in the adjacent segments when compared with the classic rigid spinal instrumentation. SUMMARY OF THE BACKGROUND DATA: Long rigid instrumentation might increase the mechanical load in the adjacent segments, the resulting hypermobility, and the risk for adjacent segment disease. Topping off instrumentation intends to reduce the hypermobility at the adjacent level by more evenly distributing segmental motion and, thereby, potentially mitigating adjacent level disease...
May 2017: Clinical Spine Surgery
Antonia Reyes Jiménez, Richard Klöpsch, Ralf Wagner, Uta C Rodehorst, Martin Kolek, Roman Nölle, Martin Winter, Tobias Placke
The next generation of lithium ion batteries (LIBs) with increased energy density for large-scale applications, such as electric mobility, but also for small electronic devices, e.g. micro-batteries and on-chip batteries, requires advanced electrode active materials with enhanced specific and volumetric capacities. In this regard, silicon (Si) as anode material has attracted much attention due to its high specific capacity. However, the enormous volume changes during lithiation/de-lithiation are still a main obstacle avoiding the broad commercial use of Si-based electrodes...
April 24, 2017: ACS Nano
Shuai Wang, Liyi Shi, Guorong Chen, Chaoqun Ba, Zhuyi Wang, Jiefang Zhu, Yin Zhao, Meihong Zhang, Shuai Yuan
The composite of tungsten-doped SnO2 and reduced graphene oxide was synthesized through a simple one-pot hydrothermal method. According to the structural characterization of the composite, tungsten ions were doped in the unit cells of tin dioxide rather than simply attaching to the surface. Tungsten-doped SnO2 was in-situ growing on the surface of graphene sheet to form a three-dimension conductive network which enhanced the electron transportation and lithium ion diffusion effectively, as well as the issues of SnO2 agglomeration and volume expansion could be avoided because the tungsten-doped SnO2 nanoparticles were homogeneously distributed on graphene sheet...
April 24, 2017: ACS Applied Materials & Interfaces
Zhihong Lei, Jiulin Wang, Jun Yang, Yanna Nuli, Zifeng Ma
Nano/micro-hierarchical-structured LiMn0.85Fe0.15PO4/C cathode materials were prepared by solvothermal synthesis combined with spray pyrolysis. XRD patterns and HRTEM images indicate that the LiMn0.85Fe0.15PO4/C are well crystallized and no impurity is observed. The as-prepared LiMn0.85Fe0.15PO4/C porous spherical (0.5-11 m) are accumulated by primary nanoparticles (~50 nm in width, 50-250 m in length). Adopting the sucrose as a carbon source, the cathode delivers a reversible discharge capacity of 171...
April 24, 2017: ACS Applied Materials & Interfaces
Guanglin Xia, Xiaowei Chen, Yan Zhao, Xingguo Li, Zaiping Guo, Craig M Jensen, Qinfen Gu, Xuebin Yu
An effective route based on space-confined chemical reaction to synthesize uniform Li2Mg(NH)2 nanoparticles is reported. The hierarchical pores inside the one-dimensional carbon nanofibers (CNFs), induced by the creation of well-dispersed Li3N, serve as intelligent nanoreactors for the reaction of Li3N with Mg-containing precursors, resulting in the formation of uniformly discrete Li2Mg(NH)2 nanoparticles. The nanostructured Li2Mg(NH)2 particles inside the CNFs is capable of complete hydrogenation and dehydrogenation at a temperature as low as 105 oC with the suppression of ammonia release...
April 24, 2017: ACS Applied Materials & Interfaces
Yang Zheng, Tengfei Zhou, Xudong Zhao, Wei Kong Pang, Hong Gao, Sean Li, Zhen Zhou, Huakun Liu, Zaiping Guo
Ultrathin 2D materials can offer promising opportunities for exploring advanced energy storage systems, with satisfactory electrochemical performance. Engineering atomic interfaces by stacking 2D crystals holds huge potential for tuning material properties at the atomic level, owing to the strong layer-layer interactions, enabling unprecedented physical properties. In this work, atomically thin Bi2 MoO6 sheets are acquired that exhibit remarkable high-rate cycling performance in Li-ion batteries, which can be ascribed to the interlayer coupling effect, as well as the 2D configuration and intrinsic structural stability...
April 24, 2017: Advanced Materials
Xiao-Yang Yang, Ji-Jing Xu, Di Bao, Zhi-Wen Chang, Da-Peng Liu, Yu Zhang, Xin-Bo Zhang
With the rising development of flexible and wearable electronics, corresponding flexible energy storage devices with high energy density are required to provide a sustainable energy supply. Theoretically, rechargeable flexible Li-O2 batteries can provide high specific energy density; however, there are only a few reports on the construction of flexible Li-O2 batteries. Conventional flexible Li-O2 batteries possess a loose battery structure, which prevents flexibility and stability. The low mechanical strength of the gas diffusion layer and anode also lead to a flexible Li-O2 battery with poor mechanical properties...
April 24, 2017: Advanced Materials
Junling Guo, Xinyu Du, Xiaolong Zhang, Fengxiang Zhang, Jinping Liu
The practical application of lithium-sulfur batteries (LSBs) is hindered by their poor cycle life, which stems mainly from the "redox shuttle reactions" of dissolved polysulfides. To develop a high-performance cathode for LSBs, encapsulation of polysulfides with a blocking layer is potentially straightforward. Herein, a novel strategy is reported encapsulate sulfur and the electrolyte together in porous carbon spheres by using a solid electrolyte interface (SEI) that can selectively sieve Li(+) ions while efficiently avoiding polysulfide accumulation and suppressing undesired polysulfide migration...
April 24, 2017: Advanced Materials
Chia-Yun Chen, Po-Hsuan Hsiao, Ta-Cheng Wei, Ting-Chen Chen, Chien-Hsin Tang
Recently, silicon (Si) nanowires have been intensively applied for a wide range of optoelectronic applications. Nevertheless, rare explorations considering the photodegradation of organic pollutants based on Si nanowires were performed, and they still require vast improvement, in particular for their degradation efficiency. In this study, broad-band and high efficiency photocatalytic systems were demonstrated through the good incorporation of Si nanowires with highly fluorescent carbon nanodots. The photodegradation rate of these intriguing heterostructure arrays under a 580 nm light illumination is approximately 6 times higher than that of sole Si nanowires, and more than 3...
April 24, 2017: Physical Chemistry Chemical Physics: PCCP
Noémie Kempf, Cristina Remes, Ralph Ledesch, Tina Züchner, Henning Höfig, Ilona Ritter, Alexandros Katranidis, Jörg Fitter
Cell-free protein synthesis (CFPS) systems were designed to produce proteins with a minimal set of purified components, thus offering the possibility to follow translation as well as protein folding. In order to characterize the performance of the ribosomes in such a system, it is crucial to separately quantify the two main components of productivity, namely the fraction of active ribosomes and the number of synthesizing cycles. Here, we provide a direct and highly reliable measure of ribosomal activity in any given CFPS system, introducing an enhanced-arrest peptide variant...
April 24, 2017: Scientific Reports
Weiwei Zhou, Dong Wang, Limin Zhao, Chunyan Ding, Xingtao Jia, Yu Du, Guangwu Wen, Huatao Wang
We rationally designed a facile two-step approach to synthesize ZnMn2O4@G composite anode material for lithium-ion batteries (LIBs), involving a template-free fabrication of ZnMn2O4 nanorings and subsequent coating of graphene sheets. Notably, it is the first time that ring-like ZnMn2O4 nanostructure is reported. Moreover, our system has been demonstrated to be quite powerful in producing ZnMn2O4 nanorings regardless of the types of Zn and Mn-containging metal salts reactants. The well-known inside-out Ostwald ripening process is tentatively proposed to clarify the formation mechanism of the hollow nanorings...
April 24, 2017: Nanotechnology
Yongjin Fang, Xin-Yao Yu, Xiong Wen David Lou
Layered metal oxides have attracted increasing attention as cathode materials for sodium-ion batteries (SIBs). However, the application of such cathode materials is still hindered by their poor rate capability and cycling stability. Here, a facile self-templated strategy is developed to synthesize uniform P2-Na0.7 CoO2 microspheres. Due to the unique microsphere structure, the contact area of the active material with electrolyte is minimized. As expected, the P2-Na0.7 CoO2 microspheres exhibit enhanced electrochemical performance for sodium storage in terms of high reversible capacity (125 mAh g(-1) at 5 mA g(-1) ), superior rate capability and long cycle life (86 % capacity retention over 300 cycles)...
April 24, 2017: Angewandte Chemie
Qianqian Zhang, Xiulin Li, Yang Chen, Qian Zhang, Huixue Liu, Jin Zhai, Xiaoda Yang
Based on electron and proton transfer events occurring in biological respiration, a mitochondria-based biocell is constructed by combining with artificial nanochannels. In this biocell, mitochondria transfer electrons to the working electrode and pump protons into the electrolyte through the tricarboxylic acid cycle. The nanochannels provide passages for protons to transport along the transmembrane concentration gradient to consume electrons on the counter electrode, forming a continuous and stable current...
April 24, 2017: Advanced Materials
Xianhong Wu, Zhiyu Wang, Mengzhou Yu, Luyang Xiu, Jieshan Qiu
The MXenes combining hydrophilic surface, metallic conductivity and rich surface chemistries represent a new family of 2D materials with widespread applications. However, their poor oxygen resistance causes a great loss of electronic properties and surface reactivity, which significantly inhibits the fabrication, the understanding of the chemical nature and full exploitation of the potential of MXene-based materials. Herein we report a facile carbon nanoplating strategy for efficiently stabilizing the MXenes against structural degradation caused by spontaneous oxidation, which provides a material platform for developing MXene-based materials with attractive structure and properties...
April 24, 2017: Advanced Materials
Eijiro Maeda, Masashi Nakagaki, Katsuhisa Ichikawa, Kazuaki Nagayama, Takeo Matsumoto
Contribution of mechanical loading to tissue growth during both the development and post-natal maturation is of a particular interest, as its understanding would be important to strategies in bone tissue engineering and regenerative medicine. The present study has been performed to investigate how immature bone responds to mechanical loading using an ex vivo culture system. A slice of the tibia, with the thickness of 3 mm, was obtained from 0-day-old chick. For the ex vivo culture experiment in conjunction with cyclic compressive loading, we developed a custom-made, bioreactor system where both the load and the deformation applied to the specimen was recorded...
June 2017: Bone Reports
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