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Power clean

Lachlan P James, Paul Comfort, Timothy J Suchomel, Vincent G Kelly, Emma M Beckman, G Gregory Haff
The purpose of this investigation was to determine whether weightlifting actions are a viable method for improving athletic performance amongst weaker, inexperienced lifters when compared to individuals with a greater power clean result, and hence weightlifting ability and experience. Two groups of males with distinctly different power clean performances (higher performance (HP): N = 8; BM = 78.1±4.0 kg; 1RM PC = 1.08±0.09 kgBM; lower performance (LP): N = 8; BM=82.6±14.0 kg; 1RM PC=0.78±0.1 kg·BM) and resistance training age (HP: resistance training experience=3...
March 14, 2018: Journal of Strength and Conditioning Research
Yuhong Guo, ShengJie Lai, Jing Zhang, Qiyong Liu, Huaiqing Zhang, Zhoupeng Ren, Deqiang Mao, Chao Luo, Yuanyuan He, Haixia Wu, Guichang Li, Dongsheng Ren, Xiaobo Liu, Zhaorui Chang
BACKGROUND: Mosquitoes are responsible for spreading many diseases and their populations are susceptible to environmental changes. The ecosystems in the Three Gorges Region were probably altered because of changes to the environment during the construction of the Three Gorges Dam (TGD), the world's largest hydroelectric dam by generating capacity. METHODS: We selected three sites at which to monitor the mosquitoes from 1997 to 2009. We captured adult mosquitoes with battery-powered aspirators fortnightly between May and September of each year in dwellings and sheds...
March 12, 2018: Acta Tropica
Martin Drost, Fan Tu, Luisa Berger, Christian Preischl, Wencai Zhou, Hartmut Gliemann, Christof Wöll, Hubertus Marbach
We demonstrate that Surface-Anchored Metal-Organic Frameworks (SURMOFs) are extraordinary well-suited as resists for high-resolution Focused Electron Beam Induced Processing (FEBIP) techniques. The combination of such powerful lithographic protocols with the huge versatility of MOF materials are investigated in respect to their potential in nanostructures fabrication. The applied FEBIP methods rely on the local decomposition of Fe(CO)5 and Co(CO)3 NO as precursors, either by the direct impact of the focused electron beam (Electron Beam Induced Deposition, EBID) or through the interaction of the precursor molecules with preirradiated/activated SURMOF areas (Electron Beam Induced Surface Activation, EBISA)...
March 14, 2018: ACS Nano
Simone A Dijkland, Daphne C Voormolen, Esmee Venema, Bob Roozenbeek, Suzanne Polinder, Juanita A Haagsma, Daan Nieboer, Vicky Chalos, Albert J Yoo, Jennifer Schreuders, Aad van der Lugt, Charles B L M Majoie, Yvo B W E M Roos, Wim H van Zwam, Robert J van Oostenbrugge, Ewout W Steyerberg, Diederik W J Dippel, Hester F Lingsma
BACKGROUND AND PURPOSE: The utility-weighted modified Rankin Scale (UW-mRS) has been proposed as a new patient-centered primary outcome in stroke trials. We aimed to describe utility weights for the mRS health states and to evaluate the statistical efficiency of the UW-mRS to detect treatment effects in stroke intervention trials. METHODS: We used data of the 500 patients enrolled in the MR CLEAN (Multicenter Randomized Clinical Trial of Endovascular Treatment for Acute Ischemic Stroke in the Netherlands)...
March 13, 2018: Stroke; a Journal of Cerebral Circulation
Yuchuan Chen, Hang Gao, Xu Wang, Dongming Guo, Ziyuan Liu
Laser induced damage threshold (LIDT) is an important optical indicator for nonlinear Potassium Dihydrogen Phosphate (KDP) crystal used in high power laser systems. In this study, KDP optical crystals are initially machined with single point diamond turning (SPDT), followed by water dissolution ultra-precision polishing (WDUP) and then tested with 355 nm nanosecond pulsed-lasers. Power spectral density (PSD) analysis shows that WDUP process eliminates the laser-detrimental spatial frequencies band of micro-waviness on SPDT machined surface and consequently decreases its modulation effect on the laser beams...
March 13, 2018: Materials
Curtis L Tomasevicz, Jack W Ransone, Christopher W Bach
The requisite combination of speed, power, and strength necessary for a bobsled push athlete coupled with the difficulty in directly measuring pushing ability makes selecting effective push crews challenging. Current practices by USA Bobsled and Skeleton (USABS) utilize field combine testing to assess and identify specifically selected performance variables in an attempt to best predict push performance abilities. Combine data consisting of 11 physical performance variables were collected from 75 subjects across two winter Olympic qualification years (2009 and 2013)...
March 12, 2018: Journal of Strength and Conditioning Research
Torstein E Dæhlin, Tron Krosshaug, Loren Z F Chiu
The purpose of this research was to investigate how lower extremity work was distributed during the pull of cleans performed lifting the barbell to the minimum height required to receive it in a full squat (minimal height clean); or with maximum effort to elevate the barbell as high as possible and receiving it in either a full (maximal effort clean) or partial (power clean) squat. Eight weightlifters screened for proficient technique performed these clean variations at 80% of one repetition maximum. Work performed on the barbell and by the lower extremity net joint moments (NJM) was computed from marker trajectories and ground reaction forces...
March 8, 2018: Journal of Sports Sciences
József Vuts, Christine M Woodcock, John C Caulfield, Stephen J Powers, John A Pickett, Michael A Birkett
BACKGROUND: The response of virgin females of the legume pest Acanthoscelides obtectus (Coleoptera: Bruchidae) to headspace extracts of volatiles collected from flowers of a nectar plant, Daucus carota, was investigated using behaviour (four-arm olfactometry) and coupled gas chromatography-electrophysiology (GC-EAG). RESULTS: Odours from inflorescences were significantly more attractive to virgin female beetles than clean air. Similarly, a sample of volatile organic compounds (VOCs) collected by air entrainment (dynamic headspace collection) was more attractive to beetles than a solvent control...
March 8, 2018: Pest Management Science
Yong Sun, Jinpeng Ma, Jürgen Kurths, Meng Zhan
The classic equal-area criterion (EAC) is of key importance in power system analysis, and provides a powerful, pictorial and quantitative means of analysing transient stability (i.e. the system's ability to maintain stable operation when subjected to a large disturbance). Based on the traditional EAC, it is common sense in engineering that there is a critical cleaning time (CCT); namely, a power system is stable (unstable) if a fault is cleared before (after) this CCT. We regard this form of CCT as bipartite...
February 2018: Proceedings. Mathematical, Physical, and Engineering Sciences
Hongyue Jin, Peter Afiuny, Stephen Dove, Gojmir Furlan, Miha Zakotnik, Yuehwern Yih, John W Sutherland
Neodymium-iron-boron (NdFeB) magnets offer the strongest magnetic field per unit volume, and thus, are widely used in clean energy applications such as electric vehicle motors. However, rare earth elements (REEs), which are the key materials for creating NdFeB magnets, have been subject to significant supply uncertainty in the past decade. NdFeB magnet-to-magnet recycling has recently emerged as a promising strategy to mitigate this supply risk. This paper assesses the environmental footprint of NdFeB magnet-to-magnet recycling by directly measuring the environmental inputs and outputs from relevant industries and compares the results with production from 'virgin' materials, using life cycle assessments...
February 27, 2018: Environmental Science & Technology
Jin-Soo Kim
Adenine base editors (ABEs), composed of an engineered deaminase and a catalytically impaired CRISPR-Cas9 variant, are powerful new tools for targeted base editing in cells and organisms. Together with cytosine base editors (CBEs), ABEs enable single-nucleotide conversions cleanly, efficiently and reversibly without double-stranded DNA cleavage, advancing genome editing in a new dimension.
February 26, 2018: Nature Plants
Yiqing Jiang, Xing Qian, Changli Zhu, Hongyu Liu, Linxi Hou
Transition metal chalcogenides with hollow nanostructures have been considered as promising substitutes as precious metal electrocatalysts for energy conversion and storage. We synthesized NiCo2S4 double-shelled ball-in-ball hollow spheres (BHSs) via a simple solvothermal route and applied them in both dye-sensitized solar cells (DSSCs) and hydrogen evolution reactions (HERs) at the same time, which were clean and sustainable ways to convert energy. Benefiting from their remarkable structure features and advantageous chemical compositions, NiCo2S4 BHSs composed of tiny crystals possessed large surface area, well-defined interior voids, and high catalytic activity...
February 26, 2018: ACS Applied Materials & Interfaces
Dustin J Oranchuk, Jason M Mannerberg, Tracey L Robinson, Megan C Nelson
Club head speed (CHS) is a major determinant of drive distance, a key component of golf performance. The purpose of this study was to determine the indirect effects of an eight-week strength and power program on CHS. Twelve (6 male, 6 female) NCAA Division II golfers (20.3±1.5 years) randomly assigned to an intervention or control group, underwent either a periodized strength and power program consisting of high-load barbell movements or a bodyweight and rotational movement focused resistance training program...
February 14, 2018: Journal of Strength and Conditioning Research
A Tokinobu, T Yorifuji, M Sasai, H Doi, T Tsuda
OBJECTIVES: The effect of tongue cleaning on digestive power is mentioned in Ayurvedic information sources. However, no study has yet evaluated this. We aimed to evaluate the effects of tongue cleaning on digestive power from Ayurvedic viewpoint, and on oral health-related quality of life (OHRQoL) in healthy adults. DESIGN: Randomized cross-over. INTERVENTIONS: We recruited healthy adults aged 20-60 years. After randomization, the immediate intervention group started tongue cleaning with a tongue scraper every morning for 4 weeks, and then waited for 4 weeks...
February 2018: Complementary Therapies in Medicine
Iwona Gajda, John Greenman, Carlo Santoro, Alexey Serov, Chris Melhuish, Plamen Atanassov, Ioannis A Ieropoulos
Power output limitation is one of the main challenges that needs to be addressed for full-scale applications of the Microbial Fuel Cell (MFC) technology. Previous studies have examined electrochemical performance of different cathode electrodes including the development of novel iron based electrocatalysts, however the long-term investigation into continuously operating systems is rare. This work aims to study the application of platinum group metals-free (PGM-free) catalysts integrated into an air-breathing cathode of the microbial fuel cell operating on activated sewage sludge and supplemented with acetate as the carbon energy source...
February 1, 2018: Energy: Technologies, Resources, Reserves, Demands, Impact, Conservation, Management, Policy
Andrew J Ward, Kimmo Arola, Emma Thompson Brewster, Chirag M Mehta, Damien J Batstone
Nutrient recovery performance utilising an electrodialysis (ED) process was quantified in a 30-cell pair pilot reactor with a 7.2 m2 effective membrane area, utilising domestic anaerobic digester supernatant, which had been passed through a centrifuge as a feed source (centrate). A concentrated product (NH4 -N 7100 ± 300 mg/L and K 2490 ± 40 mg/L) could be achieved by concentrating nutrient ions from the centrate wastewater dilute feed stream to the product stream using the ED process. The average total current efficiency for all major cations over the experimental period was 76 ± 2% (NH4 -N transport 40%, K transport 14%)...
February 8, 2018: Water Research
Jeffrey J Anderson, David Rode, Haibo Zhai, Paul Fischbeck
No abstract text is available yet for this article.
February 15, 2018: Environmental Science & Technology
Kevin Li, Tanmaya D Sambare, Sam Y Jiang, Emily J Shearer, Nathan P Douglass, Robin N Kamal
BACKGROUND: Antibiotic prophylaxis is a common but controversial practice for clean soft tissue procedures of the hand, such as carpal tunnel release or trigger finger release. Previous studies report no substantial reduction in the risk of surgical site infection (SSI) after antibiotic prophylaxis, yet are limited in power by low sample sizes and low overall rates of postoperative infection. QUESTIONS/PURPOSES: Is there evidence that antibiotic prophylaxis decreases the risk of SSI after soft tissue hand surgery when using propensity score matching to control for potential confounding variables such as demographics, procedure type, medication use, existing comorbidities, and postoperative events? METHODS: This retrospective analysis used the Truven Health MarketScan databases, large, multistate commercial insurance claims databases corresponding to inpatient and outpatient services and outpatient drug claims made between January 2007 and December 2014...
February 8, 2018: Clinical Orthopaedics and related Research
David Écija, José I Urgel, Ari P Seitsonen, Willi Auwärter, Johannes V Barth
Metallo-supramolecular engineering on surfaces provides a powerful strategy toward low-dimensional coordination architectures with prospects for several application fields. To date, most efforts have relied on transition metal centers, and only recently did we pioneer lanthanide-directed assembly. Coordination spheres and motifs with rare-earth elements generally display distinct properties and structural features. The size of the cations and shielding role of the 4f orbitals induces high coordination numbers, frequently entailing flexible coordination geometries...
February 8, 2018: Accounts of Chemical Research
M Paal, M Zoller, C Schuster, M Vogeser, G Schütze
The aim of the current study was to develop and validate a robust multi-analyte high performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS) method for simultaneous quantification of cefepime, meropenem, ciprofloxacin, moxifloxacin, linezolid and piperacillin, which are the most commonly used antibiotics in intensive care units. Sample clean-up included a protein precipitation protocol, followed by chromatographic separation on a C8 reverse phase HPLC column within 4 min, using a formic acid-ammonium formiate methanol step-elution gradient...
January 31, 2018: Journal of Pharmaceutical and Biomedical Analysis
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