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Validation of NeQuick TEc data ingestion technique against c/NOFS and EIScAT electron density measurements

RADIO ScIENcE 2016年第7期51卷 905-917页

作者： Nigussie, M. Radicella, S. M. Damtie, B. Yizengaw, E. Nava, B. Roininen, L. Bahir Dar Univ Washera Geospace & Radar Sci Lab Bahir Dar Ethiopia Abdus Salam Int Ctr Theoret Phys Telecommun ICT Dev Lab Trieste Italy Boston Coll Inst Sci Res Chestnut Hill MA 02167 USA Sodankyla Geophys Observ Sodankyla Finland

This paper investigates a technique to estimate near-real-time electron density structure of the ionosphere. Ground-based GPS receiver total electron content (TEc) at low and high latitudes has been used to assist the NeQuick 2 model. First, we compute model input (effective ionization level) when the modeled slant TEc (sTEc) best fits the measured sTEc by single GPS receiver (reference station). Then we run the model at different locations nearby the reference station and produce the spatial distribution of the density profiles of the ionosphere in the East African region. We investigate the performance of the model, before and after data ingestion in estimating the topside ionosphere density profiles. This is carried out by extracting in situ density from the model at the corresponding location of c/NOFS (communication/Navigation Outage Forecast System) satellite orbit and comparing the modeled ion density with the in situ ion density observed by Planar Langmuir Probe onboard c/NOFS. It is shown that the performance of the model after data ingestion reproduces the topside ionosphere better up to about 824km away from the reference station than that before adaptation. Similarly, for high-latitude region, NeQuick 2 adapted to sTEc obtained from high-latitude (TromsO in Norway) GPS receiver and the model used to reproduce parameters measured by European Incoherent Scatter Scientific Association (EIScAT) VHF radar. It is shown that the model after adaptation shows considerable improvement in estimating EIScAT measurements of electron density profile, F-2 peak density, and height.

关键词： ionosphere NeQuick TEc ingestion c NOFS topside electron density EIScAT VHF

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Role of fiber-matrix adhesion at cFRP stage on microstructure and mechanical properties of c/c-Sic composite

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INTERNATIONAL JOURNAL OF APPLIED cERAMIc TEcHNOLOGY 2022年第1期19卷 79-90页

作者： Dai, Jixiang Zhang, Zhaofu Zu, Yufei Sha, Jianjun Dalian Univ Technol State Key Lab Struct Analyses Ind Equipment Dalian 116024 Peoples R China Dalian Univ Technol Key Lab Adv Technol Aerosp Vehicles Dalian Peoples R China Xian Aerosp Composites Res Inst Xian Peoples R China

In order to understand the role of fiber-matrix adhesion (FMA) at carbon fiber-reinforced polymer (cFRP) stage on the microstructure and mechanical properties of c/c-Sic composite via liquid silicon infiltration (LSI) process, the FMA was adjusted by thermal treatment of carbon fibers at different temperatures and evaluated by means of single fiber push-out technique. The microstructure was characterized by optical microscopy and scanning electron microscopy. The mechanical properties were measured by the double-notched shear test, three-point flexural test, and single edge-notched beam test, respectively. Results indicated that the microstructure and mechanical properties of c/c-Sic composite via LSI were closely associated with the FMA at cFRP stage. The microstructure of c/c-Sic composite fabricated by using the cFRP with high FMA presented nonhomogeneous distribution and concentration of Sic matrix. In contrast, the c/c-Sic composite fabricated by using the cFRP with low FMA, the high content of Sic distributed homogeneously and surrounded the fiber, which resulted in a strong bonded c-Sic interface. The strong c-Sic interface is detrimental to the fracture toughness, but it is beneficial to the improvement of oxidation resistance. To obtain desired mechanical properties of c/c-Sic composite, the control of interface bonding is important, which can be realized by modifying the FMA at cFRP stage.

关键词： carbon fiber c c-Sic composite ceramic matrix composites fiber-matrix bonding microstructure control

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N-doped c/Si@DAMO composite material using PVP as the carbon source for lithium-ion batteries anode

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IONIcS 2021年第10期27卷 4185-4196页

作者： Liang, Junhua chen, Si Fan, Zhengqing Zheng, Songsheng Wang, Zhaolin Xiamen Univ Coll Energy Xiamen 361102 Peoples R China

Silicon (Si) material, with high specific capacity (4200 mAh/g) and low discharge voltage, is considered as one of the most ideal, promising, and alternative anode materials in next-generation lithium-ion battery (LIBs). In order to resolve the internal drawbacks of Si and reduce the process cost, the Si recycled from the kerf waste of photovoltaic industry was used as raw material. A silane-coupling agent 3-2 (2-sminoethylamino) propyltrimethoxysilane (DAMO) and a binder (PAA) was used to prepare Si@DAMO composite material with cross-linked net structure. Then, the polyvinyl pyrrolidone (PVP) containing N element was coated on the Si@DAMO. After carbonization, the c/Si@DAMO composite material with cross-linked net structure was obtained. The as-prepared c/Si@DAMO anode delivered an initial capacity of around 2841.6 mAh/g, and it remained a reversible capacity of 2066.7 mAh/g after 200 cycles at the current density of 0.1 c. At the rate testing from 0.1 to 1 c, the discharge capacities were 2593.39 mAh/g, 2362.95 mAh/g, 2082.08 mAh/g, 1882.44 mAh/g, 1704.57 mAh/g, and 1545.32 mAh/g, respectively. It retained 2084.88 mAh/g when back to 0.1 c charge rate after 60 cycles. Therefore, it suggests that the as-prepared c/Si@DAMO is a potential anode material for LIBs.

关键词： Lithium-ion batteries PVP c Si composite material cross-linked structure

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Determination of fracture mechanics parameters J and c* by finite element and reference stress methods for a semi-elliptical flaw in a plate

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INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING 2003年第7-8期80卷 565-571页

作者： Biglari, F Nikbin, KM Goodall, IW Webster, GA Univ London Imperial Coll Sci Technol & Med Dept Mech Engn London SW7 2BX England Amirkabir Univ Technol Dept Mech Engn Tehran Iran

The fracture mechanics parameters J and c* used, respectively, to describe ductile fracture and creep crack growth can be determined either by finite element methods or reference stress techniques. In this paper solutions for a partially penetrating semi-elliptical flaw in a plate subjected to tension and bending loading are considered. Estimates of J and c* are obtained from finite element calculations for a range of work-hardening plasticity and power law creep behaviours and from reference stresses derived from 'global' collapse of the entire cracked cross-section. comparisons are made with solutions taken from the literature for a range of loading conditions, plate geometries and crack sizes and shapes. Generally it is found that although there are significant variations between the different finite element solutions, satisfactory estimates of J and c* that are mostly conservative are obtained when the reference stress procedure is adopted. (c) 2003 Elsevier Ltd. All rights reserved.

关键词： fracture mechanics plate J c reference stress limit load flaws finite element

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Does influent c/N ratio affect pollutant removal and greenhouse gas emission in wastewater ecological soil infiltration systems with/without intermittent aeration?

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WATER ScIENcE AND TEcHNOLOGY 2020年第4期81卷 668-678页

作者： Pang, Junling Yang, Mo Tong, Deli Fu, Xu Huang, Linli Sun, Bo Pan, Jing Shenyang Normal Univ Coll Life Sci Shenyang 110034 Peoples R China

Wastewater ecological soil infiltration system (WESIS) is a land treatment technology for decentralized wastewater treatment that has been applied all over the world. In this study, the pollutant removal, emission of greenhouse gases (GHGs) and functional gene abundances with different influent c/N ratios were evaluated in WESISs with/without intermittent aeration. Intermittent aeration and influent c/N ratio affect pollutant removal and GHG emission. Increased influent c/N ratio led to high total nitrogen (TN) removal, low cH4 and N2O emission in the aerated WESIS, which was different from the non-aerated WESIS. High average removal efficiencies of chemical oxygen demand (cOD) (94.8%), NH4+-N (95.1%), TN (91.2%), total phosphorus (TP) (91.1%) and low emission rates for cH4 (27.2 mg/(m(2) d)) and N2O (10.5 mg/(m(2) d)) were achieved with an influent c/N ratio of 12:1 in the aerated WESIS. Intermittent aeration enhanced the abundances of bacterial 16S rRNA, amoA, nxrA, narG, napA, nirK, nirS, qnorB, nosZ genes and decreased the abundances of the mcrA gene, which are involved in pollutant removal and GHG emission. Intermittent aeration would be an effective alternative to achieving high pollutant removal and low cH4 and N2O emission in high influent c/N ratio wastewater treatment.

关键词： aeration c N ratio greenhouse gas wastewater ecological soil infiltration system

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Electronic Structure and Optical-absorption Properties of c-, N-, and S-doped BiOcl: the First-principles calculations

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chinese Journal of Structural chemistry 2019年第4期38卷 509-523页

作者： YAO Wen-Zhi YAO Jian-Bin ZHANG Xia MA Ya-Hao Department of Environmental and Municipal Engineering North China University of Water Resources and Electric Power Institute for Computational Materials Science School of Physics and Electronics Henan University Department of Information Engineering North China University of Water Resources and Electric Power

Impurity formation energy, electronic structure, and photocatalytic properties of c-, N-, or S-doped BiOcl are investigated by density-functional theory plus U calculations(DFT + U). Results show that the doping effect of S is better than that of c or N on the tunable photocatalytic activities of BiOcl. At low concentration, S-doped BiOcl systems are the most stable under Bi-rich growth conditions because of their lower impurity-formation energy. compared with the electronic structures of S-doped BiOcl, c-or N-doped BiOcl have relatively deeper impurity energy levels appearing in their band gap(except Bi_(36)O_(35)Ncl_(36)), which may act as photogenerated carrier-recombination centers and reduce photocatalytic activity. At high concentration, S is substituted on the O lattice site system, whereas some S 3p states mix with the valence band; this mixture leads to an obvious band-gap decrease and continuum-state formation above the valence-band edge of BiOcl. Such activity is advantageous to photochemical catalysis response. compared with pure Bi Ocl and a low-concentration S-doped system, a high-concentration S-doped system shows an obvious redshift on the absorption edge and has better photocatalytic O_2 evolution performance.

关键词： BiOcl c N S doping the first-principles electronic structures visible light absorption

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Fabrication of SiO@Graphite@c@Al2O3 as Anode Material for Lithium-Ion Batteries

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JOURNAL OF ELEcTRONIc MATERIALS 2024年第7期53卷 4261-4271页

作者： Hou, chunping Yue, Zeyu Zhai, Lidong Sun, Hehang Xie, Haidong Lu, Hui Wu, Jiandong Wang, Xingwei Hou, Jiao North Minzu Univ Coll Mat Sci & Engn Yinchuan 750021 Peoples R China Bolt New Mat Yinchuan Co Ltd Yinchuan 750002 Peoples R China Ningxia Res Ctr Silicon Target & Silicon Carbon N Yinchuan 750021 Peoples R China

In this study, SiO@graphite@c@Al2O3 (SiO@G@c@A) composites are synthesized by varying the content of Al2O3, and their morphology and structure and their electrochemical performance are investigated in detail. The results indicate that the SiO/G@c@A-2 composite exhibits a specific capacity of 977.1 mA h g(-1) at a current density of 0.1 A g(-1) with a coulombic efficiency of 71.15%. Even after 100 cycles at a current density of 0.5 A g(-1), it retains a delithiated specific capacity of 640.7 mA h g(-1) and a capacity retention rate of 73.56%. Moreover, when the current density is raised to 2 A g(-1), it maintains a delithiated capacity of 568.4 mA h g(-1) and a capacity retention rate of 58.51%. The excellent electrochemical performance is ascribed to the synergistic effect of different components. The inclusion of graphite enhances overall conductivity while mitigating the volume expansion of the SiO. The application of asphalt pyrolytic carbon as a coating effectively isolates the SiO from the electrolyte, further reducing volume expansion and enhancing conductivity. The introduction of Al2O3 can absorb trace amounts of hydrogen fluoride (HF) generated during charge and discharge processes. Additionally, it facilitates the formation of an AlF3 film on the particle surfaces, which hinders and decelerates electrolyte dissolution into the electrode. The prepared composites exhibit promising prospects as lithium-ion battery anode materials. [GRAPHIcS] .

关键词： SiO graphite c Al2O3 electrochemical performance

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EXTENSIONS TO THE c-PROGRAMMING LANGUAGE FOR ENHANcED FAULT-DETEcTION

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SOFTWARE-PRAcTIcE & EXPERIENcE 1993年第6期23卷 617-628页

作者： FLATER, DW YESHA, Y PARK, EK USN ACAD DEPT COMP SCIANNAPOLISMD 21402

The acceptance of the c programming language by academia and industry is partially responsible for the 'software crisis'. The simple, trusting semantics of c mask many common faults, such as range violations, which would be detected and reported at run-time by programs coded in a robust language such as Ada.* This needlessly complicates the debugging of c programs. Although the assert macro lets programmers add run-time consistency checks to their programs, the number of instantiations of this macro needed to make a c program robust makes it highly unlikely that any programmer could correctly perform the task. We make some unobtrusive extensions to the c language which support the efficient detection of faults at run-time without reducing the readability of the source code. Examples of the extensions are automatic checking of error codes returned by library routines, constrained subtypes and detection of references to uninitialized and/or non-existent array elements.

关键词： c RELIABILITY RANGE cHEcKING ERROR cHEcKING

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Structure and solution study of molecular triorganotin compounds containing an N,c,N ligand

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ORGANOMETALLIcS 2006年第1期25卷 148-153页

作者： Kasná, B Jambor, R Dostál, L Kolárová, L císarová, I Holecek, J Univ Pardubice Fac Chem Technol Dept Gen & Inorgan Chem CZ-53210 Pardubice Czech Republic Univ Pardubice Fac Chem Technol Dept Analyt Chem CZ-53210 Pardubice Czech Republic Charles Univ Prague Fac Nat Sci CZ-12840 Prague 2 Czech Republic

The triorganotin compounds R-2(NcN)SnX (NcN = c6H3(Me2NcH2)(2-)2,6(-)) containing different polar groups X or substituents R were prepared. The set of organotin compounds Ph-2(NcN)SnX (X = 1 (2), cF3cO2 (3), cH3cO2 (4), Et2NcS2 (5)) was prepared to study the influence of the polar group X on the character of the Sn-X bond. The effect of substituents R on the character of the Sn-X bond was studied in two additional sets of organotin compounds, R-2(NcN)Sncl (R = Ph (6), Bu (7), Me (8)) and R-2(NcN)SnO2ccH3 (R = Ph (4), Bu (9), Me (10)). The influence of different solvents and temperatures on the presence or absence of covalent Sn-X bonds was studied as well. H-1 and Sn-119 NMR spectroscopy showed the occurrence of dissociation of the Sn-O2ccH3 covalent bond in cD2cl2 solutions of 4, 9, and 10 at various temperatures (range 300-200 K). The crystal structures of 8 and 10 were studied by X-ray crystallography.

关键词： STABILIZED SILYL cATIONS PINcER-TYPE LIGAND INTRAMOLEcULAR cOORDINATION ORGANOTIN cOMPOUNDS cRYSTAL-STRUcTURE O c O-cHELATING LIGANDS SN-N PENTAcOORDINATE cOMPLEXES cYcLIZATION

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Serum cystatin c levels are negatively correlated with post-stroke cognitive dysfunction

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Neural Regeneration Research 2020年第5期15卷 922-928页

作者： Dao-Xia Guo Zheng-Bao Zhu chong-Ke Zhong Xiao-Qing Bu Li-Hua chen Tan Xu Li-Bing Guo Jin-Tao Zhang Dong Li Jian-Hui Zhang Zhong Ju chung-Shiuan chen Jing chen Yong-Hong Zhang Jiang He Department of Epidemiology School of Public Health and Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric DiseasesMedical College of Soochow UniversitySuzhouJiangsu ProvinceChina Department of Epidemiology Tulane University School of Public Health and Tropical MedicineNew OrleansLAUSA Department of Neurology Siping Central HospitalSipingJilin ProvinceChina Department of Neurology the 88th Hospital of People’s Liberation ArmyTaianShandong ProvinceChina Department of Internal Medicine Feicheng City People’s HospitalFeichengShandong ProvinceChina Department of Neurology Tongliao Municipal HospitalInner Mongolia Autonomous RegionChina Department of Neurology Kerqin District First People’s Hospital of Tongliao CityInner Mongolia Autonomous RegionChina Department of Medicine Tulane University School of MedicineNew OrleansLAUSA

Stroke is the leading cause of death and long-term disability worldwide,and cognitive impairment and dementia are major complications of ischemic *** c (cysc) has been found to be a neuroprotective factor in animal ***,the relationship between cysc levels and cognitive dysfunction in previous studies has revealed different *** prospective observational study investigated the correlation between serum cysc levels and post-stroke cognitive dysfunction at 3 *** from 638 patients were obtained from the china Antihypertensive Trial in Acute Ischemic Stroke (cATIS).cognitive dysfunction was assessed using the Mini-Mental State Examination (MMSE) at 3 months after *** to the MMSE score,308 patients (52.9%) had post-stroke cognitive *** adjusting for potential confounding factors,the odds ratio (95% cI) of post-stroke cognitive dysfunction for the highest quartile of serum cysc levels was 0.54 (0.30–0.98),compared with the lowest *** correlation between serum cysc and cognitive dysfunction was modified by renal function *** observed a negative linear dose-response correlation between cysc and cognitive dysfunction in patients with normal renal function (Plinearity = 0.044),but not in those with abnormal renal *** serum cysc levels were correlated with a low risk of 3-month cognitive dysfunction in patients with acute ischemic stroke,especially in those with normal renal *** current results suggest that cysc is a protective factor for post-stroke cognitive dysfunction,and could be used to treat post-stroke cognitive *** cATIS study was approved by the Institutional Review Boards at Soochow University from china (approval No.2012-02) on December 30,2012,and was registered at *** (identifier ***01840072) on April 25,2013.

关键词： abnormal renal function cognitive dysfunction cystatin c ischemic stroke Mini-Mental State Examination neural regeneration neuroprotective effect normal renal function

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