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Now showing items 1 - 16 of 206

  • A New Type of Capping Agent in Nanoscience: Metal Cations

    Liu, Jiawei   Wang, Shaoyan   Cai, Kai   Li, Yefei   Liu, Zhipan   Liu, Lingmei   Han, Yu   Wang, Hong   Han, Heyou   Chen, Hongyu  

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  • Reaction: Size Distribution in Olefin Block Copolymers: Not Bad at All

    Chen, Hongyu   Ginzburg, Valeriy  

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  • NAPHTHALENE BASED EPOXY FOR HALOGEN-FREE AND FLAME RETARDANT COMPOSITIONS

    A curable composition comprising, consisting of, or consisting essentially of a) an epoxy component comprising a dinaphthalene epoxy having the structure wherein each R1 group is independently a C1-C20 hydrocarbon; a is an integer in the range of from 0 to 6; m is an integer in the range of 0 to 5; and b) a hardener component comprising i) a naphthol novolac which is a reaction product of I) from 1 to 99 weight percent 1-naphthol and II) from 1 to 99 weight percent 2-naphthol; ii) a phosphorus-containing composition which is the reaction product of an etherified resole with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide; and iii) optionally a phenolic resin selected from the group consisting of a molecule having at least one substituted or unsubstituted naphthalene ring, a high functionality phenolic resin, and combinations thereof, is disclosed. The curable composition can be used to prepare prepregs and electrical laminates.
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  • Sulfur-doped graphene for efficient electrocatalytic N2-to-NH3 fixation

    Xia, Li   Yang, Jia-Jia   Wang, Huanbo   Zhao, Runbo   chen, hongyu   Fang, Wei-hai   Asiri, Abdullah M.   Xie, Fengyu   Cui, Ganglong   Sun, Xuping  

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  • Solving the step-tolled bottleneck model with general user heterogeneity

    Chen, Hongyu   Liu, Yang   Nie, Yu (Marco)  

    Highlights • Two new methods are proposed for solving the step-tolled bottleneck model with general heterogeneity. • The semi-analytical method transforms the problem into a traffic assignment problem with side constraints. • Existence and uniqueness results are obtained by analyzing a variational inequality problem. • The exact method locates the equilibrium solution by enumerating all combinations of user departure orders, with a simple heuristic to reduce the number of solutions to be enumerated. • Results confirm that ignoring user heterogeneity may lead to sub-optimal design of step tolls. Abstract Two new numerical methods, a semi-analytical method and an exact method, are proposed in this paper for solving the step-tolled user equilibrium problem for the bottleneck model with general user heterogeneity. The semi-analytical method transforms the step-tolled user equilibrium problem into a static traffic assignment problem with side constraints, which is formulated and solved as a variational inequality problem (VIP). Existence and uniqueness results are obtained by examining the properties of the VIP. The exact method, on the other hand, locates the equilibrium solution by enumerating all possible combinations of user departure orders. To improve the computational efficiency of the exact method, a simple heuristic is developed to reduce the number of solutions to be enumerated. Examples of up to 1000 classes are tested. The results confirm that ignoring user heterogeneity may lead to sub-optimal design of step tolls. In all experiments, the semi-analytical method is found to be more efficient than the heuristic version of the exact method by an order of magnitude, albeit they consistently produce nearly identical equilibrium solutions.
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  • PLA–PEG Coated Multifunctional Imaging Probe for Targeted Drug Delivery

    Chen, Hongyu   He, Susan  

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  • NAPHTHALENE BASED EPOXY FOR HALOGEN-FREE AND FLAME RETARDANT COMPOSITIONS

    A curable composition comprising, consisting of, or consisting essentially of a) an epoxy component comprising a dinaphthalene epoxy having the structure (X) wherein each R1 group is independently a C1-C20 hydrocarbon; a is an integer in the range of from 0 to 6; m is an integer in the range of 0 to 5; and b) a hardener component comprising i) a naphthol novolac which is a reaction product of I) from 1 to 99 weight percent 1-naphthol and II) from 1 to 99 weight percent 2-naphthol; ii) a phosphorus-containing composition which is the reaction product of an etherified resole with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide; and iii) optionally a phenolic resin selected from the group consisting of a molecule having at least one substituted or unsubstituted naphthalene ring, a high functionality phenolic resin, and combinations thereof, is disclosed. The curable composition can be used to prepare prepregs and electrical laminates.
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  • Hexagonal boron nitride nanosheet for effective ambient N2 fixation to NH3

    Zhang, Ya   Du, Huitong   Ma, Yongjun   Ji, Lei   Guo, Haoran   Tian, Ziqi   Chen, Hongyu   Huang, Hong   Cui, Guanwei   Asiri, Abdullah M.   Qu, Fengli   Chen, Liang   Sun, Xuping  

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  • A general approach for encapsulating organic crystals in a polyaniline shell

    Yan, Miao   Wang, Neng   Zhong, Bingju   Cheng, Xuejun   Wang, Hong   Chen, Hongyu  

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  • Advances in functional X-ray imaging techniques and contrast agents

    Chen, Hongyu   Rogalski, Melissa M.   Anker, Jeffrey N.  

    X-rays have been used for non-invasive high-resolution imaging of thick biological specimens since their discovery in 1895. They are widely used for structural imaging of bone, metal implants, and cavities in soft tissue. Recently, a number of new contrast methodologies have emerged which are expanding X-ray's biomedical applications to functional as well as structural imaging. These techniques are promising to dramatically improve our ability to study in situ biochemistry and disease pathology. In this review, we discuss how X-ray absorption, X-ray fluorescence, and X-ray excited optical luminescence can be used for physiological, elemental, and molecular imaging of vasculature, tumors, pharmaceutical distribution, and the surface of implants. Imaging of endogenous elements, exogenous labels, and analytes detected with optical indicators will be discussed.
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  • A Colon Cancer Related Gene-MLH1, Significantly Affecting the Pig Litter Size

    Chen, Hongyu   Liu, Yonggang  

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  • Boosting electrocatalytic N2 Reduction to NH3 on β-FeOOH by fluorine doping

    Zhu, Xiaojuan   Wang, Huanbo   Liu, Zaichun   Zhao, Runbo   Chen, Hongyu   Wang, Ting   Wang, Faxing   Luo, Yonglan   Wu, Yuping   Sun, Xuping  

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  • ANTI-BIOFOULING COATING BASED ON EPOXY RESIN AND AMINE-FUNCTIONAL POLYSILOXANE

    Curable coating compositions for preventing biofouling include a) at least one epoxy resin; b) at least one amine-functional poly(dialkylsiloxane) polymer in an amount from 1 to 70% based on the combined weights of components a) and b); and c) at least one alkylene polyamine, polyalkylene polyamine or polymercaptan epoxy curing agent; wherein components b) and c) together provide about 0.75 to 1.5 equivalents of amine nitrogen atoms and/or thiol groups per equivalent of epoxy groups provided by component a). When cured to form an antifouling coating, the coating exhibits a water contact angle of at least 100° as measured using an optical contact angle meter at 22°C. The coating composition adheres well to many substrates, provides good anticorrosion protection and is an effective anti-biofouling measure.
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  • POLYMERIC FOAM BOARD WITH FLEXIBLE WATER RESISTANT INTUMESCENT COATING

    An article contains a polymeric foam board having a primary surface and an intumescent coating on a primary surface of the polymeric foam board, the intumescent coating containing a polymeric binder, expandable graphite particles, a phosphorous material and a boron-containing compound and wherein the article is free of an object that is in contact with the intumescent coating and that sandwiches the intumescent coating between it and the polymeric foam board and wherein the intumescent coating has a tensile elongation of at least 50 percent and less than 100 percent at 23 degrees Celsius as measured according to ISO 37, has a storage modulus of less than 1 x 106 Pascals at 250 degrees Celsius, is halogen-free, free of sodium silicate, free of polyurea elastomer, and free of formals of pentaerythritol and dipentaerythritol.
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  • HIGH PERFORMANCE ANTI-DRIPPING AGENT USED IN GREENHOUSE FILM

    A film comprising, consisting of, or consisting essentially of: a) a polyolefin component; b) an additive comprising i) a first polyethylene oxide/polyethylene copolymer having a HLB value in the range of from 1 to 7 and a structure selected from the group consisting of CH3CH2 (CH2CH2) aCH2CH2 (OCH2CH2) bOH and CH3CH2 (CH2CH2) aCO (OCH2CH2) bOH wherein a is from 9 to 25 and b is from 1 to 10; and ii) a second polyethylene oxide/polyethylene copolymer having a HLB value in the range of from 7 to 18 and a structure selected from the group consisting of CH3CH2 (CH2CH2) aCH2CH2 (OCH2CH2) bOH and CH3CH2 (CH2CH2) aCO (OCH2CH2) bOH wherein a is from 9 to 25 and b is from 1 to 10, is disclosed. The film is used in greenhouse applications.
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  • Electrocatalytic N2 Fixation over VO2 Hollow Microsphere at Ambient Conditions

    Liu, Qian   Zhang, Rong   Guo, Haoran   Yang, Li   Wang, Yuan   Niu, Zhiguo   Huang, Hong   Chen, Hongyu   Xia, Li   Li, Tingshuai   Shi, Xifeng   Sun, Xuping   Li, Baihai  

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