检索结果-南通市图书馆

PROPAGATION OF LONG-LIVED ANTICYCLONIC ROSSBY EDDIES OVER AN ISOLATED TOPOGRAPHY AND THEIR MERGING

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2001年第3期13卷 34-45页

作者： luo, De-hai lu, yan Ocean Univ. of Qingdao Qingdao 266003 China

In a barotropic model the propagation of long-lived anticyclonic Gaussian eddies larger than the radius of deformation over a Gaussian-shaped topography and the merging of the two anticyclonic eddies are investigated by solving the generalized Flierl-Yamagata equation. It is shown that whether or not the basic flow is present, the isolated topography seems to encourage the amplification of an anticyclonic eddy and its southwest movement around the hill In the absence of both the westward flow and the topography, two anticyclonic eddies of identical sizes and amplitudes can merge. However, either the including of the topography or the westward basic flow can make them not merge. In the presence of both, the eddies can merge, but this merging depends on whether the parameter condition is appropriate or not. Therefore, it can be concluded that the topographic forcing might be a possible mechanism for the merging of two anticyclonic eddies.

关键词： Amplification Equations of motion Merging Surface topography Two dimensional

Sensitive determination of 4-O-methylhonokiol in rabbit plasma by high performance liquid chromatography and application to its pharmacokinetic investigation

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2011年第2期1卷 108-112页

作者： Ming-Yue Li Yu-hai Tang Xia Liu hai-yan lu Xi-yan Shi Institute of Analytical Science Xi 'an Jiaotong University Xi'an 710061 China.

A novel high performance liquid chromatographic method was developed for the determination of 4-O- methylhonokiol in rabbit plasma and was applied to its pharmacokinetic investigation. Plasma samples were treated by one-fold volume of methanol and acetonitrile to remove the interference proteins. A reverse phase column of SHIM- PACK VP-ODS （150 mm × 4.6 mm, 5.0 μm） was used to separate 4-O-methylhonokiol in the plasma samples. The detection limit of 4-O-methylhonokiol was 0.2 μg/L and the linear range was 0. 012 - 1. 536 mg/L. The good extraction recoveries were obtained for the spiked samples （84.7%, 89.3% and 87.7% for low, middle and high concentrations of added standards, respectively）. The relative standard deviation of intra-day and inter-day precisions was in the range from 0.6% to 13.5%. The pharmacokinetic study of 4-O-methylhonokiol was made and the results from the plasmaconcentration curve of 4-0-methylhonokiol showed a two-apartment open model. This work developed a sensitive, stable and rapid HPLC method for the determination of 4-O-methylhonokiol and the developed method has been successfully applied to a pharmacokinetic study of 4-O-methylhonokiol.

关键词： 4-O-methylhonokiol Cortex Magnoliae Officinalis high performance liquid chromatography pharmacokinetic

Effect of Silyl Moiety on the Reaction of O,O'-Phenylenephosphoryl Chloride with N-Silylvaline Silyl Ester

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1997年第12期8卷 0-0页

作者： Qian WANG hai yan lu Yu Fen ZHAO (Bioorganic Phosphorus Chemistry Laboratory, Department of Chemistry Tsinghua University, Beijing 100084) Tsinghua Univ Dept Chem Bioorgan Phosphorus Chem Lab Beijing 100084 Peoples R China

N-Trimethylsilylvaline trimethylsilyl ester IIa, N-triethylsilylvaline triethylsilyl ester IIb and N-tert-butyldimethylsilylvaline tert-butyldimethylester IIc showed evidently different reactivities with O,O'-phenylenephosphorylchloride The formation speed of the fmal spiro-bicyclic pentacoordinated phosphorus compounds IV depends on the intramolecular transfer ability of the silyl moiety crucially

关键词： MHz Phenylenephosphoryl Chloride with N-Silylvaline Silyl Ester Effect of Silyl Moiety on the Reaction of O,O

Pentacoordinated Spirophosphoranes from Amino Acid Sodium Salts

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1997年第5期8卷 397-400页

作者： hai yan lu Nan Jing ZRANG Yu Fen ZRAO(Bioorganic Phosphorus Chemistry Laboratory, Dcyartinen of ChemistryTsinghua Uhiverslty, Beijing, 100084) TSING HUA UNIV DEPT CHEMBIOORGAN PHOSPHORUS CHEM LABBEIJING 100084PEOPLES R CHINA

The reactions of 2-chloro-1,3,2-dioxaphospholane with various sodium salts of amino acids to afford the pentacoordinated spirophosphoranes containing amino acid were studied by NMR spectra techniques. The results showed that natural alpha-amino acids had greater ability than beta-amino acids to form the pentacoordinated species, which is important in the biosynthesis and prebiotic synthesis of of oligopeptides and proteins.

关键词： Pentacoordinated Spirophosphoranes from Amino Acid Sodium Salts Li

Urinary exosomal microRNA-145-5p and microRNA-27a-3p act as noninvasive diagnostic biomarkers for diabetic kidney disease

在线全文

学校读者我要写书评

暂无评论

World Journal of Diabetes 2024年第1期15卷 92-104页

作者： lu-lu Han Sheng-hai Wang Ming-yan Yao Hong Zhou Department of Endocrinology The Second Hospital of Hebei Medical UniversityShijiazhuang 050000Hebei ProvinceChina Department of Endocrinology Baoding No.1 Central HospitalBaoding 071000Hebei ProvinceChina Department of Critical Care Medicine The Affiliated Hospital of Hebei UniversityBaoding 071000Hebei ProvinceChina

BACKGROUND Diabetic kidney disease(DKD),characterized by increased urinary microalbumin levels and decreased renal function,is the primary cause of end-stage renal *** pathological mechanisms are complicated and multifactorial;Therefore,sensitive and specific biomarkers are *** exosome originate from diverse renal cells in nephron segments and partially mirror the pathological changes in the *** microRNAs(miRNAs)in urinary exosome are remark-ably stable and highly tissue-specific for the *** Type 2 diabetic mellitus(T2DM)patients were recruited from the Second Hospital of Hebei Medical University and were divided into two groups:DM,diabetic pa-tients without albuminuria[urinary albumin to creatinine ratio(UACR)hain *** correlation between exosomal miRNAs and the clinical in-dexes was *** diagnostic values of exosomal miR-145-5p and miR-27a-3p in DKD were determined using receiver operating characteristic(ROC)*** functions of miR-145-5p were investigated by performing RESULTS Urinary exosomal expression of miR-145-5p and miR-27a-3p was more upregulated in the DKD group than in the DM group(miR-145-5p:4.54±1.45 vs 1.95±0.93,Plucose,gly-cosylated hemoglobin A1c,and low-density lipoprotein *** analysis revealed that miR-145-5p had a better area under the curve of 0.88[95%confidence interval(CI):0.784-0.985

关键词： Urinary exosome MicroRNA-145-5p MicroRNA-27a-3p Diabetic kidney disease Diagnostic biomarkers

Comprehensive study on the spatial distribution of heavy metals and their environmental risks in high-sulfur coal gangue dumps in China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第2期136卷 486-497页

作者： Yingbo Dong Huan lu hai Lin School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants Beijing 100083China

The accumulation of coal gangue(CG)from coal mining is an important source of heavy metals(HMs)in *** spatial distribution and environment risk assessment are extremely important for the management and remediation of *** soil samples were collected from the high-sulfur CG site in northern China and analyzed for six *** results showed that the soil was heavily contaminated by Mn,Cr and Ni based on the Nemerow index,and posed seriously ecological risk depended on the geo-accumulation index,potential ecological risk index and risk assessment *** semi-variogram model and ordinary kriging interpolation accurately portrayed the spatial distribution of ***,Mn,and Cr were distributed by band diffusion,Ni was distributed by core,the distribution of Cu had obvious patchiness and Zn was more *** spatial autocorrelation indicated that all HMs had strong spatial *** BCR sequential extraction was employed to qualify the geochemical fractions of *** data indicated that Fe and Cr were dominated by residual fraction;Cu,Ni and Zn were dominated by reducible and oxidizable fractions;Mn was dominated by reducible and acid-extractable(25.38%-44.67%)*** correlation analysis showed that pH was the main control factor affecting the non-residue fractions of ***,acid production from high sulfur CG reduced soil pH by 2-3,which indirectly promoted the activity of ***,the conceptual model of HMs contamination at the CG site was proposed,which can be useful for the development of ecological remediation strategies.

关键词： High-sulfur coal gangue Soil contamination Heavy metals Spatial distribution Geochemical fractions Risk assessment

Electron Impact Mass Spectrometry of Acylaminotetraoxyphosphorane

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1997年第7期8卷 629-632页

作者： Nan Jing ZHANG hai yan lu Xin CHEN Yu Fen ZHAO(Bioorganic Phosphorus Chemistry Laboratory, Department of Chemistry Tsinghua University, Beijing 100084) TSING HUA UNIV DEPT CHEMBIOORGAN PHOSPHORUS CHEM LABBEIJING 100084PEOPLES R CHINA

The electron impact ionization mass spectral fragmentations of a series of acylaminotetraoxyphosphoranes were investigated. The results showed that EIMS of such compounds exhibited very characteristic fragmentation pa... 详细信息

关键词： Mass Electron Impact Mass Spectrometry of Acylaminotetraoxyphosphorane Chen

Nuclei-rich galvanizing strategy for suppressing zinc dendrite growth

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第8期43卷 4016-4018页

作者： hai-Xia Wu Kai-lu Guo College of Chemistry and Chemical Engineering Henan Key Laboratory of Function-Oriented Porous MaterialsLuoyang Normal UniversityLuoyang 471934China

The uncontrolled growth of zinc dendrites on zinc anode hinders the application of zinc ion *** solve this problem,lu's group proposed a nuclei-rich galvanizing strategy for suppressing the zinc dendrite *** allows the nuclei-rich zinc electrode to cycle steadily for1200 h and have a high Coulombic efficiency of 99.7%at15 mA·cm^(-2)with a deposited amount of 10 mAh·cm^(-2).Moreover,the Zn-MnO_(2) battery with a low N/P ratio of 1.9exhibited sustained cycling life.

关键词： cycling sustained battery

Zeolite polymer membrane as protective interface for Mg battery

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第9期43卷 4636-4638页

作者： hai-Xia Wu Kai-lu Guo College of Chemistry and Chemical Engineering Henan Key Laboratory of Function-Oriented Porous MaterialsLuoyang Normal UniversityLuoyang 471934China

Excessive electrolyte decomposition seriously determines the performance of high-voltage Mg batteries. In Nazar's work, the strategy using a zeolite polymer membrane as a protective interface was proposed to restrain the electrolyte decomposition. This strategy could boost Mg plating/stripping performance up to 6000 h in zeolite/Mg|zeolite/Mg symmetric cells and 91%capacity retention in zeolite/Mg||Mo_(3)S_(4)battery after 200 *** storage devices have been intensively explored because of their important roles in our daily lives [1D3].

关键词： zeolite interface electrolyte