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https://www.readbyqxmd.com/read/28237526/effect-of-thermal-pre-treatment-on-co-digestion-of-duckweed-lemna-gibba-and-waste-activated-sludge-on-biogas-production
#1
Rubia Zahid Gaur, Abid Ali Khan, Surindra Suthar
The duckweeds (DW) are considered as a major problem in tropical aquatic system as they grow very fast and produce enormous rich-biomass, which can be harvested for renewable energy operations. But complex lignocellulosic compounds limit their utility in process like anaerobic digestion. This batch study aimed to analyse characteristics (proximate, ultimate and physico-chemical) and possible utility of DW for anaerobic co-digestion with waste activated sludge (WAS) under mesophilic conditions for 35 d. Two sets of experiment were tested: substrate with and without thermal pre-treatment...
May 2017: Chemosphere
https://www.readbyqxmd.com/read/28236752/light-intensity-dependent-photosynthetic-electron-transport-in-eelgrass-zostera-marina-l
#2
Xiao Qi Yang, Quan Sheng Zhang, Di Zhang, Zi Tong Sheng
Responses of electron transport to three levels of irradiation (20, 200, and 1200 μmol photons m(-2) s(-1) PAR; exposures called LL, ML and HL, respectively) were investigated in eelgrass (Zostera marina L.) utilizing the chlorophyll a fluorescence technique. Exposure to ML and HL reduced the maximum quantum yield of photosystem II (PSII) (Fv/Fm) and the maximum slope decrease of MR/MRO (VPSI), indicating the occurrence of photoinhibition of both PSII and photosystem I (PSI). A comparatively slow recovery rate of Fv/Fm due to longer half-life recovery time of PSII and 40% lower descending amplitude compared to other higher plants implied the poor resilience of the PSII...
February 14, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28230999/design-of-contact-electrodes-for-semiconductor-nanowire-solar-energy-harvesting-devices
#3
Tzu-Ging Lin, Sarath Ramadurgam, Chen Yang
Transparent, low resistive contacts are critical for efficient solar energy harvesting devices. It is important to reconsider the material choices and electrode design as devices move from 2D films to 1D nanostructures. In this paper, we study the effectiveness of indium tin oxide (ITO) and metals, such as Ag and Cu, as contacts in 2D and 1D systems. Although ITO has been studied extensively and developed into an effective transparent contact for 2D devices, our results show that effectiveness does not translate to 1D systems...
February 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28228034/vibronic-enhancement-of-excitation-energy-transport-interplay-between-local-and-non-local-exciton-phonon-interactions
#4
Myeong H Lee, Alessandro Troisi
It has been reported in recent years that vibronic resonance between vibrational energy of the intramolecular nuclear mode and excitation-energy difference is crucial to enhance excitation energy transport in light harvesting proteins. Here we investigate how vibronic enhancement induced by vibronic resonance is influenced by the details of local and non-local exciton-phonon interactions. We study a heterodimer model with parameters relevant to the light-harvesting proteins with the surrogate Hamiltonian quantum dynamics method in a vibronic basis...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28227622/energy-harvesting-from-human-walking-to-power-biomedical-devices-using-oscillating-generation
#5
Jose A Montoya, Dulce M Mariscal, Edwar Romero, Jose A Montoya, Dulce M Mariscal, Edwar Romero, Dulce M Mariscal, Jose A Montoya, Edwar Romero
This work summarizes the energy generation limits from walking employing a pendulum-based generation system. Self-winding wristwatches have exploited successfully this energy input technique for decades. Pendulum-based planar devices use the rotation to produce energy for inertial generators. Then the oscillations of body motion during locomotion present an opportunity to extract kinetic energy from planar generators. The sinusoidal motion of the center of gravity of the body, on the sagittal and frontal planes, and the limbs swinging are compliant with oscillating devices...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227608/a-triboelectric-motion-sensor-in-wearable-body-sensor-network-for-human-activity-recognition
#6
Hui Huang, Xian Li, Ye Sun, Hui Huang, Xian Li, Ye Sun, Ye Sun, Hui Huang, Xian Li
The goal of this study is to design a novel triboelectric motion sensor in wearable body sensor network for human activity recognition. Physical activity recognition is widely used in well-being management, medical diagnosis and rehabilitation. Other than traditional accelerometers, we design a novel wearable sensor system based on triboelectrification. The triboelectric motion sensor can be easily attached to human body and collect motion signals caused by physical activities. The experiments are conducted to collect five common activity data: sitting and standing, walking, climbing upstairs, downstairs, and running...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227590/elastic-ribbon-like-piezoelectric-energy-harvester-for-wearable-devices-with-stretchable-surfaces
#7
You Liang Lionel, Wong, Gary K Fedder, You Liang Lionel, Wong, Gary K Fedder
This paper presents an elastic ribbon-like piezoelectric energy harvester which is targeted for skin-wearable devices by harnessing the movements of stretchable surfaces. The device aims to power up smart thin stick-on devices for healthcare monitoring. By embedding a ribbon-like PVDF film in a flexible elastomer, Ecoflex, the device is potentially able to stretch 34%, while maintaining internal strain of the film below its plastic deformation limit. Alternate electrode layout and bimorph configuration help to reduce charge cancellation, while increasing overall effectiveness...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227585/tribowalk-triboelectric-dual-functional-wireless-system-for-gait-monitoring-and-energy-harvesting
#8
Xian Li, Hui Huang, Ye Sun, Xian Li, Hui Huang, Ye Sun, Ye Sun, Hui Huang, Xian Li
In this paper, we report the design and validation of a novel wearable wireless system, TriboWalk, for gait monitoring and motion energy harvesting based on triboelectrification. Gait analysis is an important diagnostic method for medical rehabilitation. The TriboWalk system is capable of gait monitoring and analysis by capturing gait timing parameters and ground contact force (GCF) pattern based on four tribo-elements on each shoe sole. The tribo-elements are removable and easily placed on different shoes...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227187/estimation-of-heart-rate-from-foot-worn-photoplethysmography-sensors-during-fast-bike-exercise
#9
Delaram Jarchi, Alexander J Casson, Delaram Jarchi, Alexander J Casson, Alexander J Casson, Delaram Jarchi
This paper presents a new method for estimating the average heart rate from a foot/ankle worn photoplethysmography (PPG) sensor during fast bike activity. Placing the PPG sensor on the lower half of the body allows more energy to be collected from energy harvesting in order to give a power autonomous sensor node, but comes at the cost of introducing significant motion interference into the PPG trace. We present a normalised least mean square adaptive filter and short-time Fourier transform based algorithm for estimating heart rate in the presence of this motion contamination...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225123/switchable-3-0-magnetoelectric-nanocomposite-thin-film-with-high-coupling
#10
Austin McDannald, Linghan Ye, Claudia Cantoni, Sreenivasulu Gollapudi, Gopalan Srinivasan, Bryan D Huey, Menka Jain
A mixed precursor solution method was used to deposit 3-0 nanocomposite thin films of PbZr0.52Ti0.48O3 (PZT) and CoFe2O4 (CFO). The piezoelectric behavior of PZT and magnetostrictive behavior of CFO allow for magnetoelectric (ME) coupling through strain transfer between the respective phases. High ME coupling is desired for many applications including memory devices, magnetic field sensors, and energy harvesters. The spontaneous phase separation in the 3-0 nanocomposite film was observed, with 25 nm CFO particle or nanophases distributed in discrete layers through the thickness of the PZT matrix...
February 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28225121/the-local-electronic-properties-of-individual-pt-atoms-adsorbed-on-tio2-110-studied-by-kelvin-probe-force-microscopy-and-first-principles-simulations
#11
Ayhan Yurtsever, Delia Fernández-Torre, Jo Onoda, Masayuki Abe, Seizo Morita, Yoshiaki Sugimoto, Rubén Pérez
Noble metal nanostructures dispersed on metal oxide surfaces have applications in diverse areas such as catalysis, chemical sensing, and energy harvesting. Their reactivity, chemical selectivity, stability, and light absorption properties are controlled by the interactions at the metal/oxide interface. Single-atom metal adsorbates on the rutile TiO2(110)-(1 × 1) surface have become a paradigmatic model to characterize those interactions and to understand the unique electronic properties of these supported nanostructures...
February 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28224792/patterned-polymer-coatings-increase-the-efficiency-of-dew-harvesting
#12
Omar Al-Khayat, Jun Ki Hong, David M Beck, Andrew I Minett, Chiara Neto
Micro-patterned polymer surfaces, possessing both topographical and chemical characteristics, were used to capture atmospheric water. The micro-patterns mimic the structure on the back of a desert beetle that condenses water from air in a very dry environment. The patterned coatings were prepared by the dewetting of thin films of poly-4-vinylpyridine (P4VP) on top of polystyrene films (PS) films, upon solvent annealing, and consist of raised hydrophilic bumps on a hydrophobic background. The size and density distribution of the hydrophilic bumps could be tuned widely by tuning the initial thickness of the P4VP films: the diameter of the produced bumps and their height could be varied by almost two order of magnitude (1 µm - 80 µm, and 40 nm - 9000 nm, respectively), and their distribution density could be varied by 5 orders of magnitude...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28222264/graphene-ink-laminate-structures-on-polyvinylidene-difluoride-pvdf-for-pyroelectric-thermal-energy-harvesting-and-waste-heat-recovery
#13
Daniel Zabek, Kris Seunarine, Chris Spacie, Chris R Bowen
Thermal energy can be effectively converted into electricity using pyroelectrics, which act as small scale power generator and energy harvesters providing nW to mW of electrical power. In this paper, a novel pyroelectric harvester based on free standing polyvinilidene difluoride (PVDF) was manufactured that exploits the high thermal radiation absorbance of a screen printed graphene-ink electrode structure to facilitate the conversion of the available thermal radiation energy into electrical energy. The interconnected graphene nanoplatelets (GNPs) enable high thermal radiation absorbance and high electrical conductivity along with the ease of deposition using a screen print technique...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28218505/theoretically-manipulating-quantum-dots-on-two-dimensional-2d-tio2-monolayer-for-effective-visible-light-absorption
#14
Ting Liao, Ziqi Sun, Shi Xue Dou
Low solar energy harvesting and conversion efficiency has become a major problem in solar energy science and engineering owing to the difficulty in capturing solar energy across the wide solar spectrum, especially in the visible light range. Inspired by the extraordinary properties of materials arising from decreased dimensions, in this study, we explore a nano-contact system formed by a two-dimensional (2D) TiO2 monolayer and II-VI semiconductor (CdX)13 (X = S, Se and Te) nanocages for engineering the visible light absorption...
February 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28212485/efficient-upconverting-multiferroic-core-shell-photocatalysts-visible-to-near-infrared-photon-harvesting
#15
Jianming Zhang, Yue Huang, Lei Jin, Federico Rosei, Fiorenzo Vetrone, Jerome P Claverie
We report the two-step synthesis of a core@shell nanohybrid material for visible-to-near-infrared (NIR) photocatalysis. The core is constituted of NaGdF4:Er(3+), Yb(3+) upconverting nanoparticles (UCNPs). A bismuth ferrite (BFO) shell is assembled around the UCNPs via a hydrothermal process. The photocatalytic degradation assays of organic compounds of methylene orange and 4-chlorophenol reveal that core@shell nanostructures possess remarkably enhanced reaction activity under visible and NIR irradiation, compared to the BFO powder alone and the BFO-UCNP mixture...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211891/experimental-observation-of-spatially-resolved-photo-luminescence-intensity-distribution-in-dual-mode-upconverting-nanorod-bundles
#16
Pawan Kumar, Satbir Singh, V N Singh, Nidhi Singh, R K Gupta, Bipin Kumar Gupta
A novel method for demonstration of photoluminescence intensity distribution in upconverting nanorod bundles using confocal microscopy is reported. Herein, a strategy for the synthesis of highly luminescent dual mode upconverting/downshift Y1.94O3:Ho(3+)0.02/Yb(3+)0.04 nanorod bundles by a facile hydrothermal route has been introduced. These luminescent nanorod bundles exhibit strong green emission at 549 nm upon excitations at 449 nm and 980 nm with quantum efficiencies of ~6.3% and ~1.1%, respectively...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211675/synthesis-of-orthorhombic-perovskite-type-znsno3-single-crystal-nanoplates-and-their-application-in-energy-harvesting
#17
Runjiang Guo, Yiping Guo, Huanan Duan, Hua Li, Hezhou Liu
In recent years, the lead-free piezoelectric nanogenerators have attracted much attention, because of their great potential for harvesting energy from our environment. Here, we report on the first synthesis of two-dimensional (2D) single crystal ZnSnO3 hexagon nanoplates and fabrication of nanogenerators based on the single crystal ZnSnO3 nanoplates. The orthorhombic perovskite structured ZnSnO3 nanoplates with the (111) facets exposed at the surface of the plates are successfully synthesized via a one-step hydrothermal reaction...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211005/resequencing-and-annotation-of-the-nostoc-punctiforme-attc-29133-genome-facilitating-biofuel-and-high-value-chemical-production
#18
Luis E Moraes, Matthew J Blow, Erik R Hawley, Hailan Piao, Rita Kuo, Jennifer Chiniquy, Nicole Shapiro, Tanja Woyke, James G Fadel, Matthias Hess
Cyanobacteria have the potential to produce bulk and fine chemicals and members belonging to Nostoc sp. have received particular attention due to their relatively fast growth rate and the relative ease with which they can be harvested. Nostoc punctiforme is an aerobic, motile, Gram-negative, filamentous cyanobacterium that has been studied intensively to enhance our understanding of microbial carbon and nitrogen fixation. The genome of the type strain N. punctiforme ATCC 29133 was sequenced in 2001 and the scientific community has used these genome data extensively since then...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28210833/energy-transfer-in-anabaena-variabilis-filaments-adapted-to-nitrogen-depleted-and-nitrogen-enriched-conditions-studied-by-time-resolved-fluorescence
#19
Aya Onishi, Shimpei Aikawa, Akihiko Kondo, Seiji Akimoto
Nitrogen is among the most important nutritious elements for photosynthetic organisms such as plants, algae, and cyanobacteria. Therefore, nitrogen depletion severely compromises the growth, development, and photosynthesis of these organisms. To preserve their integrity under nitrogen-depleted conditions, filamentous nitrogen-fixing cyanobacteria reduce atmospheric nitrogen to ammonia, and self-adapt by regulating their light-harvesting and excitation energy-transfer processes. To investigate the changes in the primary processes of photosynthesis, we measured the steady-state absorption and fluorescence spectra and time-resolved fluorescence spectra (TRFS) of whole filaments of the nitrogen-fixing cyanobacterium Anabaena variabilis at 77 K...
February 16, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28208730/dynamic-voltage-frequency-and-workload-joint-scaling-power-management-for-energy-harvesting-multi-core-wsn-node-soc
#20
Xiangyu Li, Nijie Xie, Xinyue Tian
This paper proposes a scheduling and power management solution for energy harvesting heterogeneous multi-core WSN node SoC such that the system continues to operate perennially and uses the harvested energy efficiently. The solution consists of a heterogeneous multi-core system oriented task scheduling algorithm and a low-complexity dynamic workload scaling and configuration optimization algorithm suitable for light-weight platforms. Moreover, considering the power consumption of most WSN applications have the characteristic of data dependent behavior, we introduce branches handling mechanism into the solution as well...
February 8, 2017: Sensors
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