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Han X.,Nanjing University of Technology | Deng Y.,Nanjing University of Technology | Wang X.,Nanjing Polytechnic Institute | Jiang J.,Nanjing University of Technology
Journal of Computational and Theoretical Nanoscience | Year: 2016

When evaluating the ASET (available safe egress time), the fire scenario and the heat release rate (HRR) of the fire need to be set firstly according to the function and the combustible materials of the building, then CFD (Computational Fluent Dynamics) software is used to perform simulations. The ASET is obtained at the time when the hazard index of smoke reaches the minimum value at a safety height, and this height could be defined as critical safety height. It is very important to select critical safety height and heat release rate for the accuracy of the simulation results. The variation of selection of the critical safety height in references is large and it is lacking of credible evidence. This paper discusses the critical safety height based on statistics, probability and ergonomicsvvso as to improve the accuracy, credibility and reliability of the numerical simulation. © Copyright 2016 American Scientific Publishers All rights reserved.


Zhong K.-L.,Nanjing Polytechnic Institute
Acta Crystallographica Section E: Crystallographic Communications | Year: 2017

A new one-dimensional NiII coordination polymer of 1,3,5-tris(imidazol-1-ylmethyl)benzene, namely catena-poly[[aqua(sulfato-κO)hemi(μ-ethane-1,2-diol-κ2 O:O′)[μ3-1,3,5-tris(1H-imidazol-1-ylmethyl)benzene-κ3 N 3,N 3′,N 3′′]nickel(II)] ethane-1,2-diol monosolvate monohydrate], {[Ni(SO4)(C18H18N6)(C2H6O2)0.5 (H2O)]·C2H6O2·H2O} n , was synthesized and characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. The NiII cation is coordinated by three N atoms of three different 1,3,5-tris(imidazol-1-ylmethyl)benzene ligands, one O atom of an ethane-1,2-diol molecule, by a sulfate anion and a water molecule, forming a distorted octahedral NiN3O3 coordination geometry. The tripodal 1,3,5-tris(imidazol-1-ylmethyl)benzene ligands link the NiII cations, generating metal-organic chains running along the [100] direction. Adjacent chains are further connected by O - H⋯O hydrogen bonds, resulting in a two-dimensional supermolecular architecture running parallel to the (001) plane. Another water molecule and a second ethane-1,2-diol molecule are non-coordinating and are linked to the coordinating sulfate ions via O - H⋯O hydrogen bonds.


Zhai J.,Nanjing University | Zhai J.,Nanjing Polytechnic Institute | Wang Z.,Nanjing University | Shi P.,Nanjing University | Long C.,Nanjing University
PLoS ONE | Year: 2017

To improve biofilter performance, the microbial community of a biofilter must be clearly defined. In this study, the performance of a lab-scale polyurethane biofilter for treating waste gas with low loads of nitrobenzene (NB) (< 20 g m-3 h-1) was investigated when using different empty bed residence times (EBRT) (64, 55.4 and 34 s, respectively). In addition, the variations of the bacterial community in the biofilm on the longitudinal distribution of the biofilters were analysed by using Illumina MiSeq high-throughput sequencing. The results showed that NB waste gas was successfully degraded in the biofilter. High-throughput sequencing data suggested that the phylum Actinobacteria and genus Rhodococcus played important roles in the degradation of NB. The variations of the microbial community were attributed to the different intermediate degradation products of NB in each layer. The strains identified in this study were potential candidates for purifying waste gas effluents containing NB. © 2017 Zhai et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


A new compound [C19H19N3O3F2Cl·C4H3O4·H2O] (I), (7-((7S)-7-aminospiro[2.4]heptan- 5-yl)-8-chloro-6-fluoro-1-((1R,2S)-2-fluorocyclopropyl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid fumaric acid monohydrate), was synthesized and structurally characterized by single-crystal X-ray diffraction, 1H NMR, 14C spectra and mass spectra. I crystallizes in monoclinic, space group P21/c with a = 8.495(2), b = 12.545(3), c = 11.832(3) Å, β = 103.37(1)°, V = 1226.8(5) Å3, Z = 2, Mr = 543.90, Dc = 1.472 g/cm3, F(000) = 564, μ = 0.225 mm-1, the final R = 0.0307 and wR = 0.0892 for 6886 observed reflections with I > 2σ(I). X-ray diffraction analysis reveals that the quinolinone ring is almost coplanar, and the pyrrole ring adopts an envelope form. Packing of crystal I is constructed and stabilized by the N-H⋯O, O-H⋯O and N-H⋯Cl hydrogen bonds together with C-H⋯π interations. © 2016, Fujian Institute of Research of the Structure of Matter. All rights reserved.


Cai H.,Nanjing Polytechnic Institute | Zeng M.,Nanjing Polytechnic Institute
Functional Materials | Year: 2016

This study analyzed the major injection molding process parameters that affect the impact performance of low-density polyethylene(LDPE) by orthogonal experiment method. Response surface methodology was proposed to analyze the significant influence factors, and then determined optimal parameters setting of injection molding process. The results show that melting temperature and packing time are the two significant factors influence the impact performance of plastic product. Logical process parameters combinations of melting temperature, packing time and filling time are achieved by further analysis using response surface methodology. By using the optimal parameters, the arrangement of the fillers is improved, as a result, the impact performance of the filler composite is enhanced. © 2016 - STC "Institute for Single Crystals".


Yin J.,Nanjing University | Yin J.,Nanjing Polytechnic Institute | Tao C.,Nanjing University | Cai P.,Nanjing University | Liu X.,Nanjing University
Applied Physics Letters | Year: 2015

Acoustically inhomogeneous mediums with multiple scattering are often the nightmare of photoacoustic tomography. In order to break this limitation, a photoacoustic tomography scheme combining ultrasound interferometry and time reversal is proposed to achieve images in acoustically scattering medium. An ultrasound interferometry is developed to determine the unknown Green's function of strong scattering tissue. Using the determined Greens' function, a time-reversal process is carried out to restore images behind an acoustically inhomogeneous layer from the scattering photoacoustic signals. This method effectively decreases the false contrast, noise, and position deviation of images induced by the multiple scattering. Phantom experiment is carried out to validate the method. Therefore, the proposed method could have potential value in extending the biomedical applications of photoacoustic tomography in acoustically inhomogeneous tissue. © 2015 AIP Publishing LLC.


PubMed | Nanjing Polytechnic Institute
Type: Journal Article | Journal: Acta crystallographica. Section C, Structural chemistry | Year: 2016

The self-assembly of coordination polymers and the crystal engineering of metal-organic coordination frameworks have attracted great interest, but it is still a challenge to predict and control the compositions and structures of the complexes. Employing multidentate organic ligands and suitable metal ions to construct inorganic-organic hybrid materials through metal-ligand coordination and hydrogen-bonding interactions has become a major strategy. Recently, imidazole-containing multidentate ligands that contain an aromatic core have received much attention. A new three-dimensional Mn


PubMed | Changchun University of Technology, Nanjing Polytechnic Institute and Jilin University
Type: | Journal: Journal of pharmaceutical and biomedical analysis | Year: 2016

The microwave-assisted ionic liquid homogeneous liquid-liquid microextraction (MA-IL-HLLME) coupled with high performance liquid chromatography with diode array detection (HPLC-DAD) was developed for the determination of anthraquinones, including aloe-emodin, emodin, chrysophanol and physcion in root of Rheum palmatum L. Several experimental parameters influencing the extraction efficiency, including amount of sample, type and volume of ionic liquid, volume and pH value of extraction medium, microwave power and extraction time, concentration of NH4PF6 as well as centrifugal condition were optimized. When 140L of ionic liquid ([C8MIM][BF4]) was used as an extraction solvent, target analytes can be extracted from sample matrix in one minute with the help of microwave irradiation. The MA-IL-HLLME is simple and quick. The calibration curves exhibited good linear relationship (r>0.9984). The limits of detection and quantification were in the range of 0.015-0.026 and 0.051-0.088gmL(-1), respectively. The spiked recovery for each analyte was in the range of 81.13-93.07% with relative standard deviations lower than 6.89%. The present method is free of volatile organic solvents, and represents lower expenditures of sample, extraction time and solvent, compared with ultrasonic and heat reflux extraction. The results indicated that the present method can be successfully applied to the determination of anthraquinones in medicinal plant.


PubMed | Nanjing Polytechnic Institute
Type: Journal Article | Journal: Acta crystallographica. Section E, Crystallographic communications | Year: 2015

In the title compound, C27H21FN2O4, the mean planes of the indole ring systems (r.m.s. deviations = 0.0263 and 0.0160) are approximately perpendic-ular to one another, making a dihedral angle of 84.0(5); the fluoro-benzene ring is twisted with respect to the mean planes of the two indole ring systems at 89.5(5) and 84.6(3). In the crystal, pairs of N-HO hydrogen bonds link the mol-ecules into inversion dimers, which are further linked by N-HO hydrogen bonds into supra-molecular chains propagated along the b-axis direction. Weak C-H inter-actions are observed between neighbouring chains.


PubMed | Nanjing Polytechnic Institute, Nanyang Technological University, Nanjing University of Technology and Nanjing University
Type: Journal Article | Journal: Chemistry, an Asian journal | Year: 2016

Pi-extended polyaromatics tend to exhibit improved electronic properties with respect to the intrinsic structures. Herein, the rational design of a -extended diindole-fused diazapentacenone (IP), with a nine-ring-fused core, obtained by applying an intramolecular Friedel-Crafts diacylation synthetic routine, is reported. The chemical structure, physical properties, and morphology of IP were fully characterized. Serving as an organic cathode material for a lithium-ion battery, the as-prepared nanorods of -extended IP display higher conductivity and superior electrochemical performance than those of the naked diazapentacenone without diindole fusion.

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