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Papers by Zhan Shi

Latin American Journal of Probability and Mathematical Statistics, 2017

Journal of Power Sources, 2015

ABSTRACT Praseodymium-deficiency Pr0.94BaCo2O6-δ (P0.94BCO) double perovskite has been evaluated ... more ABSTRACT Praseodymium-deficiency Pr0.94BaCo2O6-δ (P0.94BCO) double perovskite has been evaluated as a cathode material for intermediate-temperature solid oxide fuel cells. X-ray diffraction pattern shows the orthorhombic structure with double lattice parameters from the primitive perovskite cell in Pmmm space group. P0.94BCO has a good chemical compatibility with Ce0.9Gd0.1O1.95 (CGO) electrolyte even at 1000 °C for 24 h. It is observed that the Pr-deficiency can introduce the extra oxygen vacancies in P0.94BCO, further enhancing its electrocatalytic activity for oxygen reduction reaction. P0.94BCO demonstrates the promising cathode performance as evidenced by low polarization are-specific resistance (ASR), e. g. 0.11 Ω cm2 and low cathodic overpotential e. g. −56 mV at a current density of −78 mA cm−2 at 600 °C in air. These features are comparable to those of the benchmark cathode Ba0.5Sr0.5Co0.8Fe0.2O3-δ. The fuel cell CGO-Ni|CGO|P0.94BCO presents the attractive peak power density of 1.05 W cm−2 at 600 °C. Furthermore, the oxygen reduction kinetics of P0.94BCO material is also investigated, and the rate-limiting steps for oxygen reduction reaction are determined.

Annals of Physics, 2015

Some promising photoelectrode materials with narrow band gaps are discussed. Several strategies h... more Some promising photoelectrode materials with narrow band gaps are discussed. Several strategies have been introduced to improved photoelectrodes' conversion efficiencies. Loading dual layer catalysts has been an effective method to enhance photoelectrodes' stability.

Journal of Theoretical Probability - J THEOR PROBABILITY, 2002

It is well known that, asymptotically, the appropriately normalized uniform Vervaat process, i.e.... more It is well known that, asymptotically, the appropriately normalized uniform Vervaat process, i.e., the integrated uniform Bahadur–Kiefer process properly normalized, behaves like the square of the uniform empirical process. We give a complete description of the strong and weak asymptotic behaviour in sup-norm of this representation of the Vervaat process and, likewise, we also study its pointwise asymptotic behaviour.

Supportive Care in Cancer, 2013

Purpose Bone cancer pain presents a clinical challenge with limitations of current treatments. Co... more Purpose Bone cancer pain presents a clinical challenge with limitations of current treatments. Compound kushen injection (CKI) is a well-known traditional Chinese medicine (TCM) formulation in treatment of patients with bone cancer pain. The objective of this study is to assess the efficacy and safety of CKI for bone cancer pain. Methods A systematic literature search was conducted in nine databases until December 2012 to identify randomized controlled trials (RCTs) of CKI versus current western therapies for bone cancer pain. The primary outcome was total pain relief rate. The secondary outcomes were the quality of life and adverse events at the end of treatment course. The methodological quality of RCTs was assessed independently using six-item criteria according to the Cochrane Collaboration, and the level of evidence was assessed by the GRADE approach. All data were analyzed using Review Manager 5.1.0. Results Seven RCTs with 521 patients from 2010 to 2012 were identified. Compared with radiotherapy or bisphosphonates, seven RCTs showed significant effects of CKI for improving pain relief in patients with bone cancer pain (n =521, risk ratio (RR)=1.25, 95 % CI (95 % confidence intervals (CI)), 1.13 to 1.38, p <0.0001)), three RCTs for improving Karnofsky scoring (KPS) increase rate (n =305, RR=1.62, 95 % CI, 1.32 to 1.99, p <0.00001), 1 RCT for increasing KPS scores (n =78, mean difference (MD) = 10.43, 95 % CI 4.76 to 16.10, p =0.0003). 4 RCTs reported adverse effects in both the treatment and control groups. The patients treated with CKI achieved statistically significant reductions of incidences of leukopenia (n =276, RR=0.32, 95 % CI, 0.21 to 0.47, p <0.00001) and nausea (n =78, RR=0.15, 95 % CI, 0.06 to 0.34, p <0.00001). No severe adverse events were found and no treatment was stopped because of adverse events of CKI in the treatment groups. However, the studies were deemed to have a high risk of bias. Conclusion This systematic review showed positive but weak evidence of CKI for bone cancer pain because of the poor methodological quality and the small quantity of the included trials. Future rigorously designed RCTs are required.

Stochastics An International Journal of Probability and Stochastic Processes, 1996

Let X be the gap between the future infimum and the past supremum of a transient Bessel process. ... more Let X be the gap between the future infimum and the past supremum of a transient Bessel process. It is known that the positive process X gets arbitrarily close to 0 at arbitrarily large times. Khoshnevisan [9] gives an estimate of the rate with which the small values of X approach 0. For “reasonable” functions f, we present an integral test telling whether the almost sure value of

Stochastic Processes and their Applications, 1999

Stochastic Processes and their Applications, 2004

The basic coalescing random walk is a system of interacting particles. These particles start from... more The basic coalescing random walk is a system of interacting particles. These particles start from every site of Z d , and each moves independently as a continuous-time random walk. When two particles visit the same site, they coalesce into a single particle. We are interested in: (a) the radius R d (T) of the largest ball centered at the origin which does not contain any particle at time T and (b) the amount of time d (T) when the origin is occupied during [0; T ]. We describe the almost sure asymptotic behaviours of R d (T) and d (T) (when T → ∞), in three di erent regimes depending on whether d = 1, d = 2 or d ¿ 3.

Stochastic Processes and their Applications, 2002

Powder Technology, 2014

Highly monodispersed SiO 2 @Lu 2 O 3 :Eu 3+ core-shell microspheres were successfully synthesized... more Highly monodispersed SiO 2 @Lu 2 O 3 :Eu 3+ core-shell microspheres were successfully synthesized by coating the Lu 2 O 3 :Eu 3+ nanoparticles onto the surface of non-aggregated spherical SiO 2 particles via a simple solvothermal method, followed by a subsequent calcination process. The as-prepared phosphors were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrum (FT-IR), thermal analysis (TGA-DSC), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectrometry (EDS), selected area electron diffraction (SAED), high resolution transmission electron microscopy (HRTEM), and photoluminescence spectra (PL). The as-obtained core-shell microspheres show strong red emission corresponding to the 5 D 0 → 7 F 2 transition of the Eu 3+ ions under ultraviolet (UV) excitation, which may have potential applications in light-emitting phosphors, field emission displays, advanced flat panel displays and biological labeling.

Physical Review Letters, 2012

We propose a quantum dot qubit architecture that has an attractive combination of speed and fabri... more We propose a quantum dot qubit architecture that has an attractive combination of speed and fabrication simplicity. It consists of a double quantum dot with one electron in one dot and two electrons in the other. The qubit itself is a set of two states with total spin quantum numbers S 2 = 3/4 (S = 1/2) and Sz = −1/2, with the two different states being singlet and triplet in the doubly occupied dot. Gate operations can be implemented electrically and the qubit is highly tunable, enabling fast implementation of one-and two-qubit gates in a simpler geometry and with fewer operations than in other proposed quantum dot qubit architectures with fast operations. Moreover, the system has potentially long decoherence times. These are all extremely attractive properties for use in quantum information processing devices.

Journal of the American Chemical Society, 2010

Fe electrodeposition on Au(111) and Au(100) in BMIBF(4) ionic liquid is found to form hitherto un... more Fe electrodeposition on Au(111) and Au(100) in BMIBF(4) ionic liquid is found to form hitherto unreported shape-ordered nanoscale morphologies of pseudorods and pseudosquare rings, respectively, both composed of grains of 4-7 nm. The manner of growth of the square rings is a ring-on-ring structure with enlarging side length and slightly protruding four corners. The generality of the growth mechanism is verified by the formation of almost exactly the same shape-ordered Fe nanostructures on Pt, i.e., pseudorod structure on Pt(111) and pseudosquare rings Pt(100). These structures are explained within the framework of magnetostatic interactions of spontaneously magnetized grains under crystallographic constraint of the substrate surface, which result in an antiparallel arrangement in magnetization of the grains at pseudorods and magnetic flux closure at the pseudosquare rings. The closed magnetic flux further leads to magnetic field-enhanced growth at the four corners and the outer peripheries of the pseudosquare rings. The observed shape-ordering of the Fe thin film serves as a paradigm of magnetostatic coupling, in which the roles of ionic liquid as surfactant and magnetic media may not be underestimated. The present work adds a new dimension to electrodeposition in ionic liquid, by which new magnetic film structures may be expected.

Journal of Pharmaceutical and Biomedical Analysis, 2014

Many chiral drugs are used as the racemic mixtures in clinical practice. The occurrence of enanti... more Many chiral drugs are used as the racemic mixtures in clinical practice. The occurrence of enantioselectively pharmacological activities calls for the development of enantiospecific analytical approaches during pharmacokinetic studies of enantiomers. Sample preparation plays a key role during quantitative analysis of biological samples. In current study, a rapid and reliable online solid phase extraction-chiral high performance liquid chromatography-tandem mass spectrometry (online SPE-chiral LC-MS/MS) method was developed for the simultaneously enantiospecific quantitation of (+)-trans-khellactone (dTK), (+/−)-cis-khellactone (d/lCK), (+/−)-praeruptorin A (d/lPA), (+/−)-praeruptorin B (d/lPB) and (+)praeruptorin E (dPE), the main active angular-type pyranocoumarins (APs) in Peucedani Radix (Chinese name: Qian-hu) or the major metabolites of those APs, in rat plasma. The validation assay results described here show good selectivity and enantiospecificity, extraction efficiency, accuracy and precision with quantification limits (LOQs) of 2.57, 1.28, 1.28, 1.88, 4.16, 4.16 and 4.18 ng mL −1 for dTK, lCK, dCK, dPA, dPB, lPB and dPE, respectively, while lPA was not detected in rat plasma due to the carboxylesterase(s)mediated hydrolysis. In addition, the validated system was satisfactorily applied to characterize the pharmacokinetic properties of those components in normal and chronic obstructive pulmonary disease (COPD) rats following oral administration of Qian-hu extract. dCK and lCK were observed as the main herb-related compounds in plasma. Enantioselectively pharmacokinetic profiles occurred for dCK vs lCK, dPA vs lPA, and dPB vs lPB in either normal or COPD rats. The proposed whole system is expected to be a preferable analytical tool for in vivo study of chiral drugs, in particular for the characterization of enantioselectively pharmacokinetic profiles.

Intermetallics, 2013

Microstructure, martensitic transformation, thermomechanical stability and shape memory effect of... more Microstructure, martensitic transformation, thermomechanical stability and shape memory effect of two-phase NieMneFeeGa high-temperature shape memory alloys with small B addition, were investigated by thermomechanical cycling. It is found that the high degree of martensite stabilization is observed in all studied alloys due to the compressive pre-strain. The results show that B addition and thermomechanical cycling facilitate the precipitation of the ordered g' phase. The precipitation alters the chemical compositions of martensite and results in the decrease of martensitic transformation temperature of the alloys. As a result, the formation of the ordered g' precipitate has negative effect on the thermomechanical stability of the alloys. Results further demonstrate that the martensite reorientation proceed becomes easier with small B addition due to the decrease of the yield strength, which can effectively improve shape memory effect of the alloys. However, with increasing B concentration and number of cycles, the shape memory effect gradually decreases due to the combined effects of the roles of g phase and g' precipitate, and thermomechanical cycling process.

Inorganica Chimica Acta, 2011

A new family of aminoacid-derivatized oxidovanadium complexes as potential functional model of va... more A new family of aminoacid-derivatized oxidovanadium complexes as potential functional model of vanadium haloperoxidases: [VVO(sal-phe)(OMe) (MeOH)] (1), [VIVO(sal-ala)(2,2′-bipy)]·H2O (2), [VIVO(sal-ala)(1,10-phen)]·0.5H2O (3) and [VIVO(sal-his)(1,10-phen)]·2MeOH (4) (H2sal-phe=Schiff base derived from salicylaldehyde and dl-β-phenylalanine, H2sal-ala=Schiff base derived from salicylaldehyde and dl-α-alanine, H2sal-his=Schiff base derived from salicylaldehyde and l-histidine) have been synthesized. All the complexes were characterized by elemental analysis, IR spectra and UV–Vis spectroscopy. In particular, molecular structures of three representative complexes (1, 2 and 3) were determined by X-ray crystallography. In addition, bromination reaction activity of the starting material and the complexes has been tested by a method with phenol red as organic substrate in the presence of H2O2, Br− and phosphate buffer, the studying results indicate that the vanadium complexes can catalyze the visible conversion of phenol red to bromophenol blue under weak-acid conditions and the different structural characterizations of the complexes exhibit different catalytic activity, therefore, the complexes can be considered as a potential functional model of VHPO.

Inorganic Chemistry, 2003

A family of inorganic-organic hybrid vanadium selenites with zero-, one-, two-, and three-dimensi... more A family of inorganic-organic hybrid vanadium selenites with zero-, one-, two-, and three-dimensional structures, (1,10-phen)(2)V(2)SeO(7), (2,2&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;-bipy)VSeO(4), (4,4&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;-bipy)V(2)Se(2)O(8), and (4,4&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;-bipy)(2)V(4)Se(3)O(15).H(2)O (where phen = phenanthroline and bipy = bipyridine), were hydrothermally synthesized and characterized by single-crystal X-ray diffraction. Different bidentate organodiamine ligands and reactant concentrations were used in the four reaction systems, which are responsible for the variety of structural dimensions of the compounds. (1,10-phen)(2)V(2)SeO(7) crystallizes in a monoclinic system with space group P2(1)/n and cell parameters a = 8.6509(3) A,( )b = 7.8379(2) A, c = 34.0998(13) A, beta = 91.503(2) degrees, and Z = 4. (2,2&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;-bipy)VSeO(4) crystallizes in a monoclinic system with space group C2/c and cell parameters a = 17.0895(12) A, b = 14.7707(10) A, c = 11.7657(8) A, beta = 131.354(3) degrees, and Z = 8. (4,4&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;-bipy)V(2)Se(2)O(8) crystallizes in a triclinic system with space group Ponemacr; and cell parameters a = 7.1810(10) A, b = 10.8937(13) A, c = 11.1811(15) A, alpha = 115.455(3) degrees, beta = 107.582(3) degrees, gamma = 91.957(4) degrees, and Z = 2. (4,4&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;-bipy)(2)V(4)Se(3)O(15).H(2)O crystallizes in a monoclinic system with space group Pc and cell parameters a = 7.9889(9) A, b = 7.8448 A, c = 23.048(3) A, beta = 99.389(4) degrees, and Z = 2. (1,10-phen)(2)V(2)SeO(7) has an isolated structure, (2,2&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;-bipy)VSeO(4) has a chain structure, (4,4&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;-bipy)V(2)Se(2)O(8) has a layered structure, and (4,4&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;-bipy)(2)V(4)Se(3)O(15).H(2)O…

Inorganic Chemistry, 2000

Inorganic Chemistry, 2001

A new compound, Al 2 P 2 O 8 F 2 ‚[(CH 3) 2 CHNH 2 CH 2 CH 2 NH 2 CH(CH 3) 2 ] (denoted AlPO-CJ8)... more A new compound, Al 2 P 2 O 8 F 2 ‚[(CH 3) 2 CHNH 2 CH 2 CH 2 NH 2 CH(CH 3) 2 ] (denoted AlPO-CJ8), with a 1-dimensional fluoroaluminophosphate chain and an Al/P ratio of unity has been synthesized solvothermally by using isopropylamine as an organic additive. It is characterized by X-ray powder diffraction (XRD), inductively coupled plasma (ICP), ion selective electrodes (ISE), and TGA-DTA analyses and structurally determined by singlecrystal X-ray diffraction analysis. AlPO-CJ8 crystallizes in the triclinic space group P1 h with a) 5.0306(8) Å, b) 9.3626(15) Å, c) 10.6131(17) Å, R) 65.949(4)°,) 88.218(4)°, γ) 77.19°, and Z) 2. Its structure is built up by alternation of tetrahedral PO 3 (dO) and AlO 3 F units to form infinite 1-D Al 2 P 2 O 8 F 2 2macroanionic chains. The inorganic chains are held together by diprotonated N,N′-diisopropylethylenediamine through H-bonds. The organic species N,N′-diisopropylethylenediamine is believed to be formed through solvothermal reaction of the organic additive isopropylamine and the solvent ethylene glycol. The existence of terminal PdO and Al-F bond groups in the 1-D chain indicates that it has potential to further set up higher dimensional networks through condensations.

Inorganic Chemistry, 2004

Copper I 7400 Low-Dimensional Hybrid Copper Halides with Novel D6R Cu 6 I 6 Cores.-The structures... more Copper I 7400 Low-Dimensional Hybrid Copper Halides with Novel D6R Cu 6 I 6 Cores.-The structures of the novel low-dimensional copper iodides (II) and (III) containing D6R (double six-membered rings) Cu6I6 cores are determined by single crystal XRD. (II) crystallizes in the orthorhombic space group Fdd2 with Z = 16 and (III) is monoclinic

Inorganic Chemistry Communications, 2010

ABSTRACT