1,276 research outputs found
Direct synthesis and catalytic reactivity of highly ordered large-pore methylaminopropyl-functionalized SBA-15 materials
No full textReplication Data for: On-chip topological beamformer for multi-link terahertz 6G to XG wireless
No full textThis dataset contains all the data used in the paper, titled 'On-chip topological beamformer for multi-link terahertz 6G to XG wireless'
A study of the kinetic parameters of individual macerals from Upper Permian coals in South China via open-system pyrolysis
No full textA unique Upper Permian coal, Leping coal, is widely distributed in South China. The coal samples studied in the paper were collected from two mines in the Shuicheng coalfield of Guizhou Province, southwest China. The geochemical works including coal petrography, maceral content, Rock-Eval pyrolysis, and kinetic modelling of hydrocarbon-generating have been carried out on whole coal and individual macerals. The higher contents of volatile matter, elemental hydrogen, and tar yield, and the high hydrocarbon generation potential of the Leping coals are attributed to their high content of "barkinite", a special liptinite maceral. The hydrocarbon generation potential of "barkinite" (S-2 = 287 mg/g, hydrogen index (HI)= 491 mg/g TOC) is greater than that of vitrinite (S-2 = 180 mg/g, HI = 249 mg/g TOC), and much higher than that of fusinite (S-2 = 24 mg/g, HI = 35 mg/g TOC). At the same experimental conditions, "barkinite" has a higher threshold and a narrower "oil window" than those of vitrinite and fusinite, and consequently, can generate more hydrocarbons in higher coalification temperature and shorter geological duration. Data from the activation energy distributions indicate that "barkinite" has a more homogenous chemical structure than that of vitrinite and fusinite. The above-mentioned characteristics are extremely important for exploring hydrocarbon derived from the Leping coals in South China. (C) 2000 Elsevier Science B.V. All rights reserved.Energy & FuelsGeosciences, MultidisciplinarySCI(E)EI12ARTICLE3-4293-3034
Approaching nearly zero energy of PV direct air conditioners by integrating building design, load flexibility and PCM
No full textThe energy matching of PV driven air conditioners is influenced by building load demand and PV generation. Merely increasing energy performance of building or PV capacity separately may improve the energy balance on a large time resolution, the real-time energy mismatching problem is still serious. In this study, a coordinated optimization method of PV capacity, building design, and load flexibility is proposed for improving the real-time energy matching of PVAC system. Then, a methodology integrating data mining method (XG Boost) and parametric simulation was developed to identify the determinant parameters of PV system and building design, exploring feature importance and correlations. The results of XG Boost indicate that the PV capacity, shape factor, and SHGC are the most critical factors. Finally, based on the optimized building design, the PCM layer was applied to improve the real time energy matching. To achieve a goal of 90 % ZEP, the PCM capacity can be decreased by 50.4 % and 62.8 % in Guangzhou and Shanghai in the optimized building. Moreover, the PV capacity can be reduced by 23 % in Guangzhou. The findings of this study provide practical guidance for designing PVAC system coupling with building design and energy storage devices.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Environmental & Climate Desig
A study of chemical structure in "barkinite" using time-of-flight secondary ion mass spectrometry
No full textThe Late Permian coals from south China are unique in their high content of "barkinite" and elemental hydrogen, and typically produce high yields of tar. "Barkinite" has often been identified as suberinite for a long time, but now many Chinese workers have concluded that "barkinite'" is not suberinite, rather it is a distinct maceral. The term "barkinite" was formally certified and named by the State Bureau of Technical Supervision of the People's Republic of China in 1991, 1995 and 1999; however, it has not been recognized as a scientific term by international coal geologists and ICCP, and TSOP have not recognized the term, either. The petrographic characteristics of "barkinite" and suberinite show that the biggest difference between them is in the cell fillings. Therefore, in the paper, a new in situ microprobe mass chemical analytical method, time-of-flight secondary ion mass spectrometry (TOF-SIMS) was first used to study the chemical structure of cell walls and cell fillings of "barkinite". The results indicate that the chemical structures of cell fillings and cell walls are similar to each other, They are all mostly composed of aliphatic compounds (such as alkane and alkene), and followed by aromatic compounds and alkyl aromatics, in addition to minor amounts of heteroatomic compounds (such as alkoxyl and alkylamine). Based on these, we can deduce that the cell cavities of "barkinite" were mainly filled by original lipid, which were derived from cell secretion of "barkinite" itself, But suberinite is defined only as suberinized cell walls in cork tissue, and cell cavities were usually filled by secondary gelification materials (such as corpocollinite), these characteristics are quite different from those of "barkinite". The chemical characteristics of "barkinite" shown in SIMS spectra coincide with those inferred from its petrographic characteristics. The high content of hydrogen. the high tar yields and the high hydrocarbon generation potential of Late Permian coals from south China are attributed to the high aliphatic content of "barkinite". (C) 2001 Elsevier Science BN. All rights reserved.Energy & FuelsGeosciences, MultidisciplinarySCI(E)EI15ARTICLE11-84
Comparison of Continuous Glucose Monitoring between Dexcom G4 Platinum and HD-XG Systems in Nonhuman Primates (Macaca Fascicularis)
No full textAbstractTimely knowing glucose level helps diabetic patients to manage the disease, including decisions about food, physical activity and medication. This study compared two continuous glucose monitoring systems in conscious and moving-free nonhuman primates (NHPs, Macaca fascicularis). Each normoglycemic or diabetic monkey was implanted with one Dexcom G4 Platinum subcutaneously or one HD-XG glucose sensor arterially for glucose monitoring. The glucose levels measured by both telemetry devices significantly correlated with the glucometer readings. The data of oral glucose tolerance test (oGTT) showed that the glucose levels measured by either Dexcom G4 Platinum or HD-XG transmitter were very similar to glucometer readings. However, compared to HD-XG transmitter or glucometer, Dexcom G4 Platinum detected a decreased glucose peak of ivGTT with approximately 10 min delay due to interstitial glucose far behind blood glucose change. Our data showed the advantages of the telemetry systems are: (1) consecutive data collection (day and night); (2) no bleeding; (3) no anesthesia (moving freely); (4) recording natural response without physical restriction and stress; (5) less labor intensity during ivGTT and other tests; (6) quick outcomes without lab tests. This article summarized and compared the differences of the general characteristics of two continuous glucose monitoring systems in diabetic research.</jats:p
Lepton flavor violating tau and B decays and heavy neutrinos
No full textWe study lepton flavor violating (LFV) tau and B decays in models with heavy neutrinos to constrain the mixing matrix parameters U-tauN. We find that the best current constraints when the heavy neutrinos are purely left handed come from LFV radiative tau decay modes. To obtain competitive constraints in LFV B decay, it is necessary to probe b-->X(s)tau(+/-)e(-/+) at the 10(-7) level. When the heavy neutrinos have both left- and right-handed couplings, the mixing parameters can be constrained by studying LFV B decay modes and LFV tau decay into three charged leptons. We find that the branching ratios B(tau(+/-)-->l(1)(+/-)l(2)(+/-)l(3)(-/+)), B(B-s-->tau(+/-)e(-/+)) and B(b-->X(s)l(1)(+/-)l(2)(-/+)) need to be probed at the 10(-8) level in order to constrain the mixing parameters beyond what is known from unitarity.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000226054700029&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Astronomy & AstrophysicsPhysics, Particles & FieldsSCI(E)7ARTICLE11null7
An optimized Ni doped LiFePO4/C nanocomposite with excellent rate performance
No full textBoth Ni doping and carbon coating are adopted to synthesize a nano-sized LiFePO4 cathode material through a simple solid-state reaction. It is found that the Ni2+ has been successfully doped into LiFePO4 without affecting the phospho-olivine structure from the XRD result. The images of SEM and TEM show that the size of particles is distributed in the range of 20-60 nm, and all the particles are coated with carbon completely. The results of XPS show the valence state of Fe and Ni in the LiFePO4. The electronic conductivity of the material is as high as 2.1 x 10(-1) S cm(-1), which should be ascribed to the coefficient of the conductive carbon network and Ni doping. As a cathode material for lithium-ion batteries, the Ni doped LiFePO4/C nanocomposite delivers a discharge capacity of 170 mAh g(-1) at 0.2C, approaching the theoretical value. Moreover, the material shows excellent high-rate charge and discharge capability and long-term cyclability. At the high rates of 10 and 15C. this material exhibits high capacities of 150 and 130 mAh g(-1) retaining 95% after 5500 cycles and 93% after 7200 cycles. respectively. Therefore, the as-prepared material is capable of such large-scale applications as electric vehicles and plug-in hybrid electric vehicles. (C) 2010 Elsevier Ltd. All rights reserved
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