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https://www.readbyqxmd.com/read/28918369/the-development-of-biodiversity-conservation-measures-in-china-s-hydro-projects-a-review
#1
REVIEW
Ruiqiao Bai, Xuehua Liu, Xiaofei Liu, Lanmei Liu, Jianping Wang, Sihui Liao, Annah Zhu, Zhouyuan Li
The hydropower capacity of China ranks first in the world and accounts for approximately 20% of the total energy production in the country. While hydropower has substantially contributed to meeting China's renewable energy targets and providing clean energy to rural areas, the development of hydropower in China has been met with significant controversy. Ecologically, hydro projects alter the landscape, with potential impacts to the country's aquatic biodiversity. Over the past four decades in China, various mainstream opinions and misunderstandings have been presented concerning how to alleviate the negative impacts of hydro projects on aquatic ecosystems...
September 14, 2017: Environment International
https://www.readbyqxmd.com/read/28918346/anaerobic-digestion-for-bioenergy-production-global-status-environmental-and-techno-economic-implications-and-government-policies
#2
REVIEW
Juliana Vasco-Correa, Sami Khanal, Ashish Manandhar, Ajay Shah
Anaerobic digestion (AD) is a mature technology that can transform organic matter into a bioenergy source - biogas (composed mainly of methane and carbon dioxide), while stabilizing waste. AD implementation around the world varies significantly, from small-scale household digesters in developing countries to large farm-scale or centralized digesters in developed countries. These differences in the implementation of AD technology are due to a complex set of conditions, including economic and environmental implications of the AD technology, and stimulus provided by a variety of polices and incentives related to agricultural systems, waste management, and renewable energy production...
September 5, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28917860/carbon-materials-derived-from-chitosan-cellulose-cryogel-supported-zeolite-imidazole-frameworks-for-potential-supercapacitor-application
#3
Zehui Li, Lan Yang, Hongbin Cao, Yu Chang, Kexin Tang, Zhiqin Cao, Junjun Chang, Youpeng Cao, Wenbo Wang, Meng Gao, Chenming Liu, Dagang Liu, He Zhao, Yi Zhang, Mingjie Li
In order to promote sustainable development, green and renewable clean energy technologies continue to be developed to meet the growing demand for energy, such as supercapacitor, fuel cells and lithium-ion battery. It is urgent to develop appropriate nanomaterials for these energy technologies to reduce the volume of the device, improve the efficiency of energy conversion and enlarge the energy storage capacity. Here, chitosan/cellulose carbon cryogel (CCS/CCL) were designed and synthesized. Through the introduction of zeolite imidazole frameworks (ZIFs) into the chitosan/cellulose cryogels, the obtained materials showed a microstructure of ZIF-7 (a kind of ZIFs) coated chitosan/cellulose fibers (CS/CL)...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28915743/electronic-orbital-response-of-regular-extended-and-infinite-periodic-systems-to-magnetic-fields-i-theoretical-foundations-for-static-case
#4
Michael Springborg, Mohammad Molayem, Bernard Kirtman
A theoretical treatment for the orbital response of an infinite, periodic system to a static, homogeneous, magnetic field is presented. It is assumed that the system of interest has an energy gap separating occupied and unoccupied orbitals and a zero Chern number. In contrast to earlier studies, we do not utilize a perturbation expansion, although we do assume the field is sufficiently weak that the occurrence of Landau levels can be ignored. The theory is developed by analyzing results for large, finite systems and also by comparing with the analogous treatment of an electrostatic field...
September 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28915735/the-effect-of-finite-pore-length-on-ion-structure-and-charging
#5
Konrad Breitsprecher, Manuel Abele, Svyatoslav Kondrat, Christian Holm
Nanoporous supercapacitors play an important role in modern energy storage systems, and their modeling is essential to predict and optimize the charging behaviour. Two classes of models have been developed that consist of finite and infinitely long pores. Here, we show that although both types of models predict qualitatively consistent results, there are important differences emerging due to the finite pore length. In particular, we find that the ion density inside a finite pore is not constant, but increases linearly from the pore entrance to the pore end, where the ions form a strongly layered structure...
September 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28915480/facile-fabrication-of-mediator-free-z-scheme-photocatalyst-of-phosphorous-doped-ultrathin-graphitic-carbon-nitride-nanosheets-and-bismuth-vanadate-composites-with-enhanced-tetracycline-degradation-under-visible-light
#6
Yaocheng Deng, Lin Tang, Guangming Zeng, Jiajia Wang, Yaoyu Zhou, Jingjing Wang, Jing Tang, Longlu Wang, Chengyang Feng
To realize the sustainable employment of solar energy in contaminant degradation and environmental recovery, design and development of an efficient photocatalyst is urgently needed. Herein, a novel direct Z-scheme composite photocatalysts consist of phosphorous-doped ultrathin g-C3N4 nanosheets (PCNS) and bismuth vanadate (BiVO4) are developed via a one-pot impregnated precipitation method. The as-prepared hybrid nanocomposite was utilized for the degradation tetracycline (TC) under visible light irradiation...
September 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28915326/adaptive-immunity-and-metabolic-health-harmony-becomes-dissonant-in-obesity-and-aging
#7
Leena P Bharath, Blanche C Ip, Barbara S Nikolajczyk
Adipose tissue (AT) is the primary energy reservoir organ, and thereby plays a critical role in energy homeostasis and regulation of metabolism. AT expands in response to chronic overnutrition or aging and becomes a major source of inflammation that has marked influence on systemic metabolism. The chronic, sterile inflammation that occurs in the AT during the development of obesity or in aging contributes to onset of devastating diseases such as insulin resistance, diabetes, and cardiovascular pathologies. Numerous studies have shown that inflammation in the visceral AT of humans and animals is a critical trigger for the development of metabolic syndrome...
September 12, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28915016/cell-free-protein-synthesis-enhancement-from-real-time-nmr-metabolite-kinetics-redirecting-energy-fluxes-in-hybrid-rrl-systems
#8
Baptiste Panthu, Théophile Ohlmann, Johan Perrier, Uwe Schlattner, Pierre Jalinot, Bénédicte Elena-Herrmann, Gilles J P Rautureau
A counter-intuitive cell-free protein synthesis (CFPS) strategy, based on reducing the ribosomal fraction in rabbit reticulocyte lysate (RRL), triggers the development of hybrid systems composed of RRL ribosome-free supernatant complemented with ribosomes from different mammalian cell-types. Hybrid RRL systems maintain translational properties of the original ribosome cell types, and deliver protein expression levels similar to RRL. Here, we show that persistent ribosome-associated metabolic activity consuming ATP is a major obstacle for maximal protein yield...
September 15, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28912457/photoelectrolysis-using-type-ii-semiconductor-heterojunctions
#9
S Harrison, M Hayne
The solar-powered production of hydrogen for use as a renewable fuel is highly desirable for the world's future energy infrastructure. However, difficulties in achieving reasonable efficiencies, and thus cost-effectiveness, have hampered significant research progress. Here we propose the use of semiconductor nanostructures to create a type-II heterojunction at the semiconductor-water interface in a photoelectrochemical cell (PEC) and theoretically investigate it as a method of increasing the maximum photovoltage such a cell can generate under illumination, with the aim of increasing the overall cell efficiency...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28910792/inflammation-a-key-contributor-to-the-genesis-and-progression-of-chronic-kidney-disease
#10
Qi Qian
It has become apparent that inflammation and inflammatory reactions can evoke renal injury and promote chronic kidney disease (CKD) progression. Under physiological condition, intrarenal vascular distribution is heterogeneous, and medulla is hypoxic. To avoid energy deprivation in the low pO2 regions of the kidney, an array of hormones, autocoids, and vasoactive substances, including medullipin, prostaglandins, endothelins, nitric oxide, angiotensin II, kinins, and adenosine, tonically regulates the microvasculature to ensure a perfect match of the microcirculation (O2 supply) and renal tubules (O2 demand)...
2017: Contributions to Nephrology
https://www.readbyqxmd.com/read/28910582/model-based-performance-and-energy-analyses-of-reverse-osmosis-to-reuse-wastewater-in-a-pvc-production-site
#11
Kang Hu, Thorsten Fiedler, Laura Blanco, Sven-Uwe Geissen, Simon Zander, David Prieto, Angeles Blanco, Carlos Negro, Nathalie Swinnen
A pilot-scale reverse osmosis (RO) followed behind a membrane bioreactor (MBR) was developed for the desalination to reuse wastewater in a PVC production site. The solution-diffusion-film model (SDFM) based on the solution-diffusion model (SDM) and the film theory was proposed to describe rejections of electrolyte mixtures in the MBR effluent which consists of dominant ions (Na(+) and Cl(-)) and several trace ions (Ca(2+), Mg(2+), K(+) and SO4(2-)). The universal global optimisation method was used to estimate the ion permeability coefficients (B) and mass transfer coefficients (K) in SDFM...
September 14, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28906074/fully-automated-quantum-chemistry-based-computation-of-spin-spin-coupled-nuclear-magnetic-resonance-spectra-for-molecules
#12
Stefan Grimme, Christoph Bannwarth, Sebastian Dohm, Andreas Hansen, Jana Pisarek, Philipp Pracht, Jakob Seibert, Frank Neese
We present a composite procedure for the quantum chemical computation of spin-spin coupled 1H-NMR spectra for general, flexible molecules in solution. It is based on four main steps, namely, conformer/rotamer ensemble (CRE) generation by the fast tight-binding method GFN-xTB and a newly developed search algorithm, relative free energy and NMR parameter computation, and solution of the spin-Hamiltonian. In this way the NMR-specific nuclear permutation problem is solved and the correct spin-symmetries are obtained...
September 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28905946/sequential-molecule-triggered-release-system-based-on-acetylated-amylose-helix-aggregates
#13
Yongchun Liu, Wei Gao, Chunhong Zhang, Peng Tang, Yuan Zhao, Daocheng Wu
We developed a novel sequential molecule-triggered-release system based on acetylated amylose helix aggregates with a proper degree of substitution, in which a loaded molecule can be trigger-released by trigger molecules in sequence. The system is sensitive and capable of time-controllable triggered release. The mechanism involves the sequential pushing of wrapped molecules with low binding free energy out of the helix cavity by a triggered molecule with a high binding free energy.
September 14, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28905889/real-space-imaging-of-non-collinear-antiferromagnetic-order-with-a-single-spin-magnetometer
#14
I Gross, W Akhtar, V Garcia, L J Martínez, S Chouaieb, K Garcia, C Carrétéro, A Barthélémy, P Appel, P Maletinsky, J-V Kim, J Y Chauleau, N Jaouen, M Viret, M Bibes, S Fusil, V Jacques
Although ferromagnets have many applications, their large magnetization and the resulting energy cost for switching magnetic moments bring into question their suitability for reliable low-power spintronic devices. Non-collinear antiferromagnetic systems do not suffer from this problem, and often have extra functionalities: non-collinear spin order may break space-inversion symmetry and thus allow electric-field control of magnetism, or may produce emergent spin-orbit effects that enable efficient spin-charge interconversion...
September 13, 2017: Nature
https://www.readbyqxmd.com/read/28905203/adaptive-resolution-simulations-of-biomolecular-systems
#15
Julija Zavadlav, Staš Bevc, Matej Praprotnik
In this review article, we discuss and analyze some recently developed hybrid atomistic-mesoscopic solvent models for multiscale biomolecular simulations. We focus on the biomolecular applications of the adaptive resolution scheme (AdResS), which allows solvent molecules to change their resolution back and forth between atomistic and coarse-grained representations according to their positions in the system. First, we discuss coupling of atomistic and coarse-grained models of salt solution using a 1-to-1 molecular mapping-i...
September 13, 2017: European Biophysics Journal: EBJ
https://www.readbyqxmd.com/read/28905125/biometeorological-forecasts-for-health-surveillance-and-prevention-of-meteor-tropic-effects
#16
Luis B Lecha Estela
An early method of biometeorological forecasts was developed for Cuba during the late 90s. It was based on the relationship between the daily occurrence of massive health crisis and the magnitude of the 24-h differences of partial density of oxygen in the air (PODA index). Ten years later, applying new technological facilities, a new model was developed in order to offer operational biometeorological forecast to Cuban health institutions. After a satisfactory validation process, the official bioforecast service to health institutions in Villa Clara province began on February of 2012...
September 13, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28905064/mechanochemical-synthesis-of-high-coercivity-nd2-fe-co-14b-magnetic-particles
#17
Y Zhong, V Chaudhary, X Tan, H Parmar, R V Ramanujan
With increasing demand for magnets in energy conversion systems, the quest for the development and understanding of novel processing routes to produce permanent magnets has become urgent. We report a novel mechanochemical process for the synthesis of Nd2(Fe,Co)14B magnetic particles with a high coercivity of 12.4 kOe. This process involves the reduction of neodymium oxide, iron oxide, cobalt oxide and boron anhydride in the presence of a calcium reducing agent and a CaO diluent. The formation mechanism of Nd2(Fe,Co)14B changed with increasing CaO content, and the average crystal size of the Nd2(Fe,Co)14B particles also increased, resulting in an increase in the coercivity values...
September 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28903085/multiscale-molecular-dynamics-simulations-of-lipid-interactions-with-p-glycoprotein-in-a-complex-membrane
#18
Laura Domicevica, Heidi Koldsø, Philip C Biggin
P-glycoprotein (P-gp) can transport a wide range of very different hydrophobic organic molecules across the membrane. Its ability to extrude molecules from the cell creates delivery problems for drugs that target proteins in the central nervous system (CNS) and also causes drug-resistance in many forms of cancer. Whether a drug will be susceptible to export by P-gp is difficult to predict and currently this is usually assessed with empirical and/or animal models. Thus, there is a need to better understand how P-gp works at the molecular level in order to fulfil the 3Rs: Refinement, reduction and replacement of animals in research...
September 2, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28902985/cellulose-based-nanomaterials-for-energy-applications
#19
REVIEW
Xudong Wang, Chunhua Yao, Fei Wang, Zhaodong Li
Cellulose is the most abundant natural polymer on earth, providing a sustainable green resource that is renewable, degradable, biocompatible, and cost effective. Recently, nanocellulose-based mesoporous structures, flexible thin films, fibers, and networks are increasingly developed and used in photovoltaic devices, energy storage systems, mechanical energy harvesters, and catalysts components, showing tremendous materials science value and application potential in many energy-related fields. In this Review, the most recent advancements of processing, integration, and application of cellulose nanomaterials in the areas of solar energy harvesting, energy storage, and mechanical energy harvesting are reviewed...
September 13, 2017: Small
https://www.readbyqxmd.com/read/28902139/autonomous-sensors-powered-by-energy-harvesting-from-von-karman-vortices-in-airflow
#20
Marco Demori, Marco Ferrari, Arianna Bonzanini, Pietro Poesio, Vittorio Ferrari
In this paper an energy harvesting system based on a piezoelectric converter to extract energy from airflow and use it to power battery-less sensors is presented. The converter is embedded as a part of a flexure beam that is put into vibrations by von Karman vortices detached from a bluff body placed upstream. The vortex street has been investigated by Computational Fluid Dynamics (CFD) simulations, aiming at assessing the vortex shedding frequency as a function of the flow velocity. From the simulation results the preferred positioning of the beam behind the bluff body has been derived...
September 13, 2017: Sensors
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