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| 1 | Presence of organophosphate flame retardants(OPEs)in different functional areas in residential homes in Beijing,China显示文摘The production and application of organophosphate esters(OPEs)have dramatically increased in recent years due to their use as a replacement for brominated flame retardants.In this study,13 OPEs(∑_(13)OPEs)were analyzed in indoor air samples from kitchens and living rooms in 14 residential homes in Beijing,China.The concentrations of ∑_(13)OPEs in kitchen air samples(mean:13 ng/m^(3))were significantly(p<0.05)higher than in living room air samples(5.0 ng/m^(3)).In addition,paired window surface organic film samples were collected and analyzed to investigate film-air partitioning,exhibiting a mean concentration of ∑_(13)OPEs of 4100 ng/m^(2).The congener profiles showed that tris(2-chloroisopropyl)phosphate(TCPP)was the predominant compound in both window film samples(48%)and the corresponding indoor air sample(56%).The estimated daily intakes(EDI)of OPEs via indoor air inhalation were 2.8 and 1.4 ng/kg/day for infants and adults,respectively,both of which are below the reference dose values(RfDs).Overall,these findings indicate that OPEs in the indoor air environment of residential homes in Beijing are not likely to pose a health risk to the general population. | Kun Lv Lu Bai Boyu Song Xindong Ma Minmin Hou Jie Fu Yali Shi Yawei Wang Guibin Jiang | 2022 | Journal of Environmental Sciences2022，34，5： | 1 |
| 2 | Aromatization and isomerization of methylcyclohexane over Ni catalysts supported on different supports显示文摘In this work, nickel metal supported on different supports(SiO_2, Al_2O_3, ZSM-5) were prepared by spraying nickel nitrate on the supports and calcined at 873 K. Then, they were characterized by XRD, XRF, N_2 adsorption–desorption, NH_3-TPD, MCH-TPD, H_2-TPR, and pyridine-FTIR,and tested as catalysts for the dehydrogenation aromatization and isomerization of methylcyclohexane(MCH) under the conditions of S-Zorb catalytic adsorption desulfurization(T ? 673 K, P ? 1.5 MPa, WHSV ? 5 h^(-1)). The H2-TPR results showed that the interaction of NiO with support decreased in the order of NiO/ZSM-5-Fe < NiO/ZSM-5 < NiO/Al_2O_3< NiO/SiO2. The decrease of the interaction appeared to facilitate the reduction of Ni and therefore to promote the dehydrogenation aromatization of MCH.It was found that a direct correlation existed between the gasoline components yields, cracking activity and the total number of different supports acid sites measured by NH_3-TPD tests. Higher total acidity of ZSM-5 resulted in gasoline loss because of higher cracking activity of MCH. The number of total acid sites of NiO/ZSM-5-Fe decreased and the medium strong Br€onsted acid sites necessary for MCH isomerization increased after the modification of ZSM-5 by iron metal. So, NiO/ZSM-5-Fe exhibited enhanced MCH conversion, aromatic and isomerization yields when compared to NiO/ZSM-5 and other Ni-based catalysts. This study shows that NiO/ZSM-5-Fe catalyst may be possible to be integrated into the S-Zorb system achieving the recovery of the octane number of gasoline. | Ye Song Wei Lin Xingcui Guo Linlin Dong Xindong Mu Huiping Tian Lei Wang | 2019 | Green Energy & Environment2019，4，1： | 1 |
| 3 | Photocatalytic degradation kinetics and mechanism of environmental pharmaceuticals in aqueous suspension of TiO 2 : A case of β-blockers显示文摘 | Hai Yang Taicheng An Guiying Li Weihua Song William J. Cooper Haiying Luo Xindong Guo | 2010 | Journal of Hazardous Materials2010，，1： | 1 |
| 4 | A silent two-photon imaging system for studying in vivo auditory neuronal functions显示文摘Two-photon laser-scanning microscopy has become an essential tool for imaging neuronal functions in vivo and has been applied to different parts of the neural system,including the auditory system.However,many components of a two-photon microscope,such as galvanometer-based laser scanners,generate mechanical vibrations and thus acoustic artifacts,making it difficult to interpret auditory responses from recorded neurons.Here,we report the development of a silent two-photon imaging system and its applications in the common marmoset(Callithrix Jacchus),a non-human primate species sharing a similar hearing range with humans.By utilizing an orthogonal pair of acoustooptical deflectors(AODs),full-frame raster scanning at video rate was achieved without introducing mechanical vibrations.Imaging depth can be optically controlled by adjusting the chirping speed on the AODs without any mechanical motion along the Z-axis.Furthermore,all other sound-generating components of the system were acoustically isolated,leaving the noise floor of the working system below the marmoset’s hearing threshold.Imaging with the system in awake marmosets revealed many auditory cortex neurons that exhibited maximal responses at low sound levels,which were not possible to study using traditional two-photon imaging systems.This is the first demonstration of a silent two-photon imaging system that is capable of imaging auditory neuronal functions in vivo without acoustic artifacts.This capacity opens new opportunities for a better understanding of auditory functions in the brain and helps isolate animal behavior from microscope-generated acoustic interference. | Xindong Song Yueqi Guo Chenggang Chen Xiaoqin Wang | 2022 | Light(Science & Applications)2022，11，5： | 0 |
| 5 | Structure-preserving Analysis on Folding and Unfolding Process of Undercarriage显示文摘The main idea of the structure-preserving method is to preserve the intrinsic geometric properties of the continuous system as much as possible in numerical algorithm design. The geometric constraint in the multi-body systems, one of the difficulties in the numerical methods that are proposed for the multi-body systems, can also be regarded as a geometric property of the multi-body systems. Based on this idea, the symplectic precise integration method is applied in this paper to analyze the kinematics problem of folding and unfolding process of nose undercarriage. The Lagrange governing equation is established for the folding and unfolding process of nose undercarriage with the generalized defined displacements firstly. And then, the constrained Hamiltonian canonical form is derived from the Lagrange governing equation based on the Hamiltonian variational principle. Finally, the symplectic precise integration scheme is used to simulate the kinematics process of nose undercarriage during folding and unfolding described by the constrained Hamiltonian canonical formulation. From the numerical results, it can be concluded that the geometric constraint of the undercarriage system can be preserved well during the numerical simulation on the folding and unfolding process of undercarriage using the symplectic precise integration method. | Weipeng Hu Mingzhe Song Zichen Deng Xindong Wang Zhiwei Xiong | 2016 | Acta Mechanica Solida Sinica2016，29，6： | 0 |
| 6 | LKAW: A Robust Watermarking Method Based on Large Kernel Convolution and Adaptive Weight Assignment显示文摘Robust watermarking requires finding invariant features under multiple attacks to ensure correct extraction.Deep learning has extremely powerful in extracting features,and watermarking algorithms based on deep learning have attracted widespread attention.Most existing methods use 3×3 small kernel convolution to extract image features and embed the watermarking.However,the effective perception fields for small kernel convolution are extremely confined,so the pixels that each watermarking can affect are restricted,thus limiting the performance of the watermarking.To address these problems,we propose a watermarking network based on large kernel convolution and adaptive weight assignment for loss functions.It uses large-kernel depth-wise convolution to extract features for learning large-scale image information and subsequently projects the watermarking into a highdimensional space by 1×1 convolution to achieve adaptability in the channel dimension.Subsequently,the modification of the embedded watermarking on the cover image is extended to more pixels.Because the magnitude and convergence rates of each loss function are different,an adaptive loss weight assignment strategy is proposed to make theweights participate in the network training together and adjust theweight dynamically.Further,a high-frequency wavelet loss is proposed,by which the watermarking is restricted to only the low-frequency wavelet sub-bands,thereby enhancing the robustness of watermarking against image compression.The experimental results show that the peak signal-to-noise ratio(PSNR)of the encoded image reaches 40.12,the structural similarity(SSIM)reaches 0.9721,and the watermarking has good robustness against various types of noise. | Xiaorui Zhang Rui Jiang Wei Sun Aiguo Song Xindong Wei Ruohan Meng | 2023 | Computers, Materials & Continua2023，，4： | 0 |
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