检索结果-南通市图书馆

Improbability of DUrca Process Constraints EOS

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2007年第6期7卷 809-813页

作者： hao Tong qiu-He Peng Department of Astronomy Nanjing University Nanjing 210093

According to recent observational and theoretical progresses, the DUrca process （direct Urca process） may be excluded from the category of neutron star cooling mechanisms. This result, combined with the latest nuclear symmetry energy experiments, will provide us an independent way of testing the EOS （equation of state） for supernuclear density. For example, soft EOSs, such as FPS, will probably be excluded.

关键词： equation of state -- neutrinos -- stars neutron

Acid deposition critical loads modeling for the simulation of sulfur exceedance and reduction in Guangdong, China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2009年第8期21卷 1108-1117页

作者： qiu Rongliang WANG Shizhong qiu hao WANG Xuemei LIAO Jin ZHANG Zhentian School of Environmental Science and Engineering Sun Yat-sen University Guangzhou 510275 China School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta GA 30332 USA Guangdong Provincial Environmental Protection Bureau Guangzhou 510630 China

The current acid deposition critical loads in Guangdong, China were calculated using the PROFILE model with a 3 km × 3 km resolution. Calculations were carded out for critical loads of potential acidity, actual acidity, sulfur and nitrogen, with values in extents of 0-3.5, 0-14.0, 0-26.0 and 0-3.5 kmol/（***）, respectively. These values were comparable to previously reported results and reflected the influences of vegetation and soil characteristics on the soil acid buffering capacity. Simulations of SO2 emission and sulfur deposition in this study showed that sulfur deposition core areas mirrored SO2 emission centers. The prediction of sulfur deposition after 20% and 40% reduction of SO2 emission suggested that the reduction of area sources contributed greatly to the decrease of sulfur deposition. Thus, abatement of area source emissions could be the primary way to mitigate sulfur deposition in Guangdong to meet both the provincial and national regulations of air pollution control.

关键词： acid deposition critical loads modeling SO2 reduction sulfur deposition exceedance and reduction

Pseudo-Channel Matrix Truncation Based Spatial Correlation Mitigation in Massive MIMO

在线全文

学校读者我要写书评

暂无评论

China Communications 2021年第9期18卷 130-147页

作者： Yitian Chen Shaoshuai Gao Guofang Tu hao qiu School of Electronic Electrical and Communication Engineeringthe University of Chinese Academy of SciencesBeijing 101408China

Massive multiple-input multiple-output(MIMO),a technique that can greatly increase spectral efficiency(SE)of cellular networks,has attracted significant interests in recent *** of the major limitations of massive MIMO systems is pilot contamination,which will deteriorate the *** superimposed pilot-based scheme has been proved to be a viable method for pilot contamination ***,it cannot break through another limitation of massive MIMO,i.e.,spatial *** addition,it will also lead to interference between the pilot and user data since they are imposed *** this paper,we try to tackle these two issues,which will be described as ***,a column-wise asymptotically orthogonal matrix,named as pseudo-channel matrix,is developed by orthogonalization of received *** recover the information about the large-scale fading(LSF)coefficients,the pseudo-channel matrix is truncated according to the cardinality of adjacent users set(CAUS).By this means,spatial correlation can be mitigated ***,robust independent component analysis(RobustICA)is used to reduce the interference caused by user data,and as a result the system performance can be further *** simulation results demonstrate the effectiveness of the proposed method.

关键词： massive MIMO pilot contamination pseudo-channel matrix spatial correlation superim-posed pilots.

A Fuzzy-based Methodology for an Aggregative Environmental Risk Assessment of Restored Soil

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2014年第2期24卷 220-231页

作者： WANG Shi-Zhong Zhao Zhi-hao XIA Bing qiu hao J.L.MOREL qiu Rong-Liang School of Environmental Science and Engineering Sun Yat-sen University Guangdong Provincial Key Lab of Environmental Pollution Control and Remediation Technology Laboratoire Sols et Environnement UMR 1120 ENSAIA-INPL/INRA

Environmental risks pertaining to contaminated soils have been well studied,while little attention has been paid to the risks of the soils after remediation. In this study,a concept model developed based on fuzzy set theory was applied to evaluate the uncertainties of three risk indicators,namely,plant growth,groundwater safety and human health,of a restored site that had been previously polluted by heavy metals. The concept model classified the grade and importance of risk factors by an 11-level ranking system and was able to yield a comprehensive risk result rather than multi-risk results for complex risk indicators. Modeling results showed that the risks to the three indicators were effectively reduced after the remediation. Moreover,great sensitivity of the risks was found related to the weight distribution among the three risk indicators. In general,the risks of both polluted and restored soils to the environment were in the order of groundwater safety > plant growth > human health. The model was proved to solve the problems of multi-risk results due to complex risk indicators that previously encountered by other researchers,which made it helpful in decision-making and management of restored soils.

关键词： fuzzy set theory heavy metals remediated risk assessment weight distribution

Solid oxide fuel cells in combination with biomass gasification for electric power generation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2020年第4期28卷 1156-1161页

作者： Huangang Shi Qianjun Li Wenyi Tan hao qiu Chao Su School of Environmental Engineering Nanjing Institute of TechnologyNanjing 211167PR China School of Energy and Power Engineering Jiangsu University of Science and TechnologyZhenjiang 212003PR China WA School of Mines MineralsEnergy and Chemical Engineering(WASM-MECE)Curtin UniversityGPO Box U1987PerthWA 6845Australia

Biomass,a source of renewable energy,represents an effective substitute to fossil *** is a process that organics are thermochemically converted into valuable gaseous products(***).In this work,the catalytic test demonstrated that the biogas produced from biomass gasification mainly consists of H2,CH4,CO,and CO2,which were then be used as the fuel for solid oxide fuel cell(SOFC).Planar SOFCs were fabricated and *** steam reforming of biogas was carried out at the anode of a SOFC to obtain a hydrogen-rich *** performance of the SOFCs operating on generated biogas was investigated by I-V polarization and electrochemical impedance spectra *** excellent cell performance was obtained,for example,the peak power density of the SOFC reached 1391 mW·cm-2 at 750℃when the generated biogas was used as the ***,the SOFC fuelled by simulated biogas delivered a very stable operation.

关键词： Biomass gasification Biogas Solid oxide fuel cell Steam reforming

Microscopic Magnetic Dipole Radiation in Neutron Stars

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2008年第3期8卷 269-276页

作者： hao Tong qiu-He Peng Hua Bai Department of Astronomy Nanjing University Nanjing 210093 China

There is a ^3P2 neutron superfluid region in NS （neutron star） interior. For a rotating NS the ^3P2 superfluid region is like a system of rotating magnetic dipoles. It will give out electromagnetic radiation, which may provide a new heating mechanism of NSs. This mechanism plus some cooling agent may give a sound explanation to NS glitches.

关键词： stars neutron -- pulsars general -- dense matter -- magnetic fields

Alignment calibration and performance study of the STAR PXL detector

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2017年第2期28卷 61-69页

作者： Long Ma Xin Dong hao qiu Spiros Margetis Yu-Gang Ma Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049China Nuclear Science Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA Purdue University West Lafayette IN 47907 USA Kent State University Kent OH 44242 USA ShanghaiTech University Shanghai 200031 China

We report in this paper the alignment calibration of the STAR pixel detector(PXL) prototype for the RHIC2013 run and performance study of the full PXL detector installed and commissioned in the RHIC 2014 run. PXL detector is the innermost two silicon layers of the STAR heavy flavor tracker aiming at high-precision reconstruction of secondary decay vertex of heavy flavor particles. To achieve the physics goals, the calibration work was done on the detector with high precision. A histogram-based method was successfully applied for the alignment calibration, and the detector efficiency after alignment was studied using both p t p collision data and cosmic ray data.

关键词： Alignment calibration Heavy flavor tracker STAR

Attenuation of Metal Bioavailability in Acidic Multi-Metal Contaminated Soil Treated with Fly Ash and Steel Slag

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2012年第4期22卷 544-553页

作者： qiu hao GU Hai-Hong HE Er-Kai WANG Shi-Zhong qiu Rong-Liang School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275(China) Guangdong Provincial Key Lab of Environmental Pollution Control and Remediation Technology Guangzhou 510275(China)

A pot experiment was conducted with multi-metal （Pb, Cd, Cu, and Zn） contaminated acidic soil to investigate changes in available metal burden resulting from the application of industrial wastes （fly ash and steel slag）. The efficiency of amendments- induced metal stabilization was evaluated by diffusive gradients in thin films （DGT）, sequential extraction, and plant uptake. The stability of remediation was assessed by an acidification test and by chemical equilibrium modeling. Addition of fly ash （20 g kg-1） and steel slag （3 g kg-1） resulted in similar increase in soil pH. Both amendments significantly decreased the concentrations of metals measured with DGT （CDGT） and the metal uptake by Oryza sativa L. Significant correlations were found between CDGT and the concentration of a combination of metal fractions （exchangeable, bound to carbonates, and bound to Fe/Mn oxides）, unraveling the labile species that participate in the flux of metal resupply. The capability of metal resupply, as reflected by the R （ratio of CDGT to pore water metal concentration） values, significantly decreased in the amended soils. The CDGT correlated well with the plant uptake, suggesting that DGT is a good indicator for bioavailability. Acidification raised the extractable metal concentration in amended soil but the concentration did not return to the pre-amendment level. Equilibrium modeling indicated that the soil amendments induced the precipitation of several Fe, A1 and Ca minerals, which may play a positive role in metal stabilization. Chemical stabilization with alkaline amendments could be an effective and stable soil remediation strategy for attenuating metal bioavailability and reducing plant metal uptake.

关键词： acidification chemical stabilization diffusive gradients in thin films (DGT) heavy metal remediation

Effects of rhamnolipids on bacterial communities in a dioxin-contaminated soil and the gut of earthworms added to the soil

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2023年第6期33卷 927-937页

作者： Bing XIA Dan HUANG Mao YE hao qiu Hongfeng CHEN Keqiang Zhao Rongliang qiu Rongrong YING Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection(NIES) Nanjing 210042China Research Academy of Environmental Sciences of Anhui Province Hefei 230071China College of Environmental and Resource Sciences Zhejiang UniversityHangzhou 310058China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Shanghai Jiao Tong University School of Environmental Science and EngineeringShanghai 200240China Guangdong Laboratory for Lingnan Modern Agriculture College of Natural Resources and EnvironmentSouth China Agricultural UniversityGuangzhou 510642China

The biosurfactants rhamnolipids and the “soil ecosystem engineers” earthworms are often used to remediate contaminated soils. However, the effects of rhamnolipids on earthworm intestinal flora and microbial community in soil containing earthworms are not clearly understood. In our study, a 21-d microcosm experiment was carried out to reveal the effects of rhamnolipids on microbial abundance, composition, and metabolism, as well as contaminant degradation capacity. Both rhamnolipids and earthworms had positive effects on soil bacteria. Rhamnolipid-amended soil(RT) showed higher bacterial abundance and metabolic activity than earthworm-amended soil(ET), while the improvement in bacterial composition and contaminant degradation capacity by rhamnolipids was lower than that by earthworms. Notably, these effects were further amplified by the combined treatment of rhamnolipids and earthworms(RET). Specifically, the bacterial abundance(log-transferred) increased from 9.5 copies g-1in the control with no addition to 10.3, 10.6, and 11.1 copies g-1in ET, RT, and RET, respectively. Compared to ET, the relative abundance of the dominant phylum, Proteobacteria, increased from 41.66% to 51.67% in RET,and more pollutant-degrading bacteria were also enriched in RET. Therefore, the increases in bacterial abundance and contaminant-degrading bacteria led to the following ranking of soil dioxin removal rate: RET(77.28%) > ET(59.83%) > RT(24.65%) > control(4.71%). Moreover, the addition of rhamnolipids enhanced the abundance of bacterial functional genes involved in metabolism and environmental information processing. In addition, the composition and diversity of bacteria in the gut of earthworms were conspicuously affected by rhamnolipids, and the relative abundance of Microbacterium and Shewanella increased significantly(P < 0.05). Therefore, this study revealed that rhamnolipids remarkably influenced the abundance, composition, and metabolism of the microbial community in earthworm g

关键词： bioremediation biosurfactant contaminant-degrading bacteria intestinal bacteria metabolic pathway metabolism microcosm experiment soil pollution