The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Wanhui Liu - One of the best experts on this subject based on the ideXlab platform.

  • identification and quantification of bioactive compounds in Diaphragma juglandis fructus by uhplc q orbitrap hrms and uhplc ms ms
    Journal of Agricultural and Food Chemistry, 2019
    Co-Authors: Rongxia Liu, Ziyan Zhao, Shengjun Dai, Xin Che, Wanhui Liu
    Abstract:

    Diaphragma juglandis fructus is the dry wooden diaphragm inside walnuts and a byproduct in food processing of walnut kernels. The purpose of our research is to enrich the information on compounds in Diaphragma juglandis fructus to further discover and exploit its potential nutritional value. In this study, new quali-quantitative analytical approaches were developed to identify and determine bioactive compounds in Diaphragma juglandis fructus. Two-hundred compounds, including hydrolyzable tannins, flavonoids, phenolic acids, and quinones, were identified by UHPLC-Q-Orbitrap HRMS, more than 150 of which were first discovered in Diaphragma juglandis fructus. Among them, 21 major dietary polyphenols with health-promoting effects were successfully quantified using UHPLC-MS/MS, with total contents of 2.88-6.18 mg/g. This successful characterization and quantification of bioactive compounds in Diaphragma juglandis fructus gives a better understanding of its potential nutritional value and supports efficiently developing and reusing it instead of discarding it as agrofood waste.

  • Identification and Quantification of Bioactive Compounds in Diaphragma juglandis Fructus by UHPLC-Q-Orbitrap HRMS and UHPLC-MS/MS
    2019
    Co-Authors: Rongxia Liu, Ziyan Zhao, Shengjun Dai, Xin Che, Wanhui Liu
    Abstract:

    Diaphragma juglandis fructus is the dry wooden diaphragm inside walnuts and a byproduct in food processing of walnut kernels. The purpose of our research is to enrich the information on compounds in Diaphragma juglandis fructus to further discover and exploit its potential nutritional value. In this study, new quali–quantitative analytical approaches were developed to identify and determine bioactive compounds in Diaphragma juglandis fructus. Two-hundred compounds, including hydrolyzable tannins, flavonoids, phenolic acids, and quinones, were identified by UHPLC-Q-Orbitrap HRMS, more than 150 of which were first discovered in Diaphragma juglandis fructus. Among them, 21 major dietary polyphenols with health-promoting effects were successfully quantified using UHPLC-MS/MS, with total contents of 2.88–6.18 mg/g. This successful characterization and quantification of bioactive compounds in Diaphragma juglandis fructus gives a better understanding of its potential nutritional value and supports efficiently developing and reusing it instead of discarding it as agrofood waste

M. Okuyama - One of the best experts on this subject based on the ideXlab platform.

Robert B. Fleischman - One of the best experts on this subject based on the ideXlab platform.

  • a coupled connector element for nonlinear static pushover analysis of precast concrete diaphragms
    Engineering Structures, 2015
    Co-Authors: Ge Wan, Robert B. Fleischman, Dichuan Zhang, Clay Naito
    Abstract:

    Abstract This paper describes the formulation of a diaphragm connector element developed for use in two-dimensional finite element (2D-FE) modeling of precast concrete diaphragms. The connector elements, composed of assemblages of standard element types readily available in most FE software package libraries, are nonlinear, coupled for shear–tension interaction, enable friction mechanisms, and possess descending branch behavior. Element construction is based on data from full-scale tests of common precast diaphragm connectors. The 2D-FE models have been employed in nonlinear static “pushover” analysis of isolated floor diaphragms to determine diaphragm stiffness, strength, deformation capacity, and limit state sequence. The use of discrete elements to model the precast diaphragm connectors permits the direct evaluation of local force and deformation demands acting on these details. Further, the coupled formulation is adaptable to complex force histories and deformation patterns in the floor diaphragm, thereby permitting the element to respond in realistic fashion. The models, verified for accuracy using large scale testing, are providing crucial information on capacity and limit states for calibrating performance-based design factors for a new seismic design methodology for precast concrete diaphragms.

  • integrated analytical and experimental research to develop a new seismic design methodology for precast concrete diaphragms
    Journal of Structural Engineering-asce, 2013
    Co-Authors: Robert B. Fleischman, Dichuan Zhang, Richard Sause, Clay Naito, Jose I Restrepo, Matthew J Schoettler
    Abstract:

    AbstractA new seismic diaphragm design methodology has been developed for precast concrete floor diaphragms. The knowledge required to create the design methodology was obtained through an integrated analytical and experimental research project using two Network for Earthquake Engineering Simulation (NEES) equipment sites. The activities of the project involved a sequence of integrated research tasks that systematically developed knowledge about diaphragm behavior from the reinforcement detail level to the structural system level. These tasks included the use of state-of-the-art experimental techniques made possible through the NEES facilities including hybrid simulation and large-scale shake table tests. Such techniques were crucial to the research as the complex behavior of precast diaphragms is not well described by simple analytical models or idealized experiments. Valuable industry oversight in the planning, execution, and technology transfer stages of the project guided the research activities, incl...

  • seismic design methodology for precast concrete diaphragms part 1 design framework
    Pci Journal, 2005
    Co-Authors: Robert B. Fleischman, Richard Sause, Clay Naito, Jose I Restrepo, S K Ghosh
    Abstract:

    The Precast/Prestressed Concrete Institute is conducting an "area of emphasis: research project on precast concrete diaphragms. The project has been called Diaphragm Seismic Design Methodology (DSDM). The purpose of this paper is to outline the foundation for the research by presenting the underlying design philosophy and resulting design framework that will serve as the basis for the technical papers to follow and the eventual design methodology at the projected conclusion. The objective of the DSDM project is to develop an industry endorsed design methodology for precast/prestressed concrete diaphragms including: the forces, displacements, and deformations for which the diaphragm should be designed; the diaphragm reinforcing details that can provide this performance; and the required stiffness of the diaphragm relative to the primary lateral force resisting system elements.

  • effect of dimension and detail on the capacity of precast concrete parking structure diaphragms
    Pci Journal, 2003
    Co-Authors: Kenneth T Farrow, Robert B. Fleischman
    Abstract:

    The paper presents a study that focuses on diaphragms in precast parking structures. The analytical study presented represents an examination of precast concrete diaphragm capacity. In this stage, the global stiffness, strength, and ductility capacity of the diaphragm are examined with respect to structural dimensions and diaphragm reinforcing details. Many of the findings can equally be appplied to long-span precast concrete diaphgrams in general. The paper presents conclusions that pertain to internal load paths, service level behavior, and ultimate capacity of precast parking structure diaphgrams. The conclusions are qualitative in nature; the quantitative realizations of these conclusions are presented in a companion paper recommendations.

  • dynamic behavior of perimeter lateral system structures with flexible diaphragms
    Earthquake Engineering & Structural Dynamics, 2001
    Co-Authors: Robert B. Fleischman, Kenneth T Farrow
    Abstract:

    Building structures are typically designed using the assumption that the floor systems serve as a rigid diaphragm between the vertical elements of the lateral load-resisting system. However, long-floor span structures with perimeter lateral load-resisting systems possess diaphragms which behave quite flexibly. The dynamic behaviour of such structures is dissimilar to the behavior expected of typical structures. This difference can lead to unexpected force and drift patterns. If force levels are sufficiently under-estimated, inelastic diaphragm behaviour can occur, exacerbating the effects of diaphragm flexibility. Such response may lead to a non-ductile diaphragm failure or structural instability due to high drift demands in the gravity system. Analytical models were developed which capture the diaphragm flexibility of structures with long-floor spans and perimeter lateral-systems. Modal examination and time-history analyses were performed to determine the effect of diaphragm flexibility and diaphragm inelastic behaviour on the dynamic behaviour of these structures. Copyright © 2001 John Wiley & Sons, Ltd.

Rongxia Liu - One of the best experts on this subject based on the ideXlab platform.

  • identification and quantification of bioactive compounds in Diaphragma juglandis fructus by uhplc q orbitrap hrms and uhplc ms ms
    Journal of Agricultural and Food Chemistry, 2019
    Co-Authors: Rongxia Liu, Ziyan Zhao, Shengjun Dai, Xin Che, Wanhui Liu
    Abstract:

    Diaphragma juglandis fructus is the dry wooden diaphragm inside walnuts and a byproduct in food processing of walnut kernels. The purpose of our research is to enrich the information on compounds in Diaphragma juglandis fructus to further discover and exploit its potential nutritional value. In this study, new quali-quantitative analytical approaches were developed to identify and determine bioactive compounds in Diaphragma juglandis fructus. Two-hundred compounds, including hydrolyzable tannins, flavonoids, phenolic acids, and quinones, were identified by UHPLC-Q-Orbitrap HRMS, more than 150 of which were first discovered in Diaphragma juglandis fructus. Among them, 21 major dietary polyphenols with health-promoting effects were successfully quantified using UHPLC-MS/MS, with total contents of 2.88-6.18 mg/g. This successful characterization and quantification of bioactive compounds in Diaphragma juglandis fructus gives a better understanding of its potential nutritional value and supports efficiently developing and reusing it instead of discarding it as agrofood waste.

  • Identification and Quantification of Bioactive Compounds in Diaphragma juglandis Fructus by UHPLC-Q-Orbitrap HRMS and UHPLC-MS/MS
    2019
    Co-Authors: Rongxia Liu, Ziyan Zhao, Shengjun Dai, Xin Che, Wanhui Liu
    Abstract:

    Diaphragma juglandis fructus is the dry wooden diaphragm inside walnuts and a byproduct in food processing of walnut kernels. The purpose of our research is to enrich the information on compounds in Diaphragma juglandis fructus to further discover and exploit its potential nutritional value. In this study, new quali–quantitative analytical approaches were developed to identify and determine bioactive compounds in Diaphragma juglandis fructus. Two-hundred compounds, including hydrolyzable tannins, flavonoids, phenolic acids, and quinones, were identified by UHPLC-Q-Orbitrap HRMS, more than 150 of which were first discovered in Diaphragma juglandis fructus. Among them, 21 major dietary polyphenols with health-promoting effects were successfully quantified using UHPLC-MS/MS, with total contents of 2.88–6.18 mg/g. This successful characterization and quantification of bioactive compounds in Diaphragma juglandis fructus gives a better understanding of its potential nutritional value and supports efficiently developing and reusing it instead of discarding it as agrofood waste

Kaoru Yamashita - One of the best experts on this subject based on the ideXlab platform.

  • buckling behavior of piezoelectric diaphragms for highly sensitive structures of ultrasonic microsensors controlled through intrinsic stress of pzt films
    2015 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF) International Symposium on Integrated Functionalities (ISIF) and P, 2015
    Co-Authors: Kaoru Yamashita, Kaito Arai, Hikaru Tanaka, Taiki Nishiumi, Minoru Noda
    Abstract:

    Buckling behavior of silicon-micro machined diaphragm structures was investigated for highly sensitive structures of piezoelectric ultrasonic microsensors from the viewpoint of intrinsic stress of sol-gel derived lead-zirconate-titanate (PZT) films. Since upward buckled diaphragm structures yield higher sensitivity than flat or downward ones, intrinsic PZT stress should be controlled adequately to realize the upward buckling. Calcination temperature in the sol-gel PZT deposition process was varied to control the stress, from 300°C to 400°C for various thickness up to full-thickness of 1 µm, and diaphragm structures with the PZT films were fabricated and their buckling deflections were evaluated. The full-thick PZT films calcined at 300°C or 350°C show rather large tensile stress and the diaphragms with the films showed all flat or even spontaneously broke. The PZT films calcined at 400°C had an adequate stress and the diaphragms with the full-thick PZT showed all upward buckling with large enough buckling deflection for the high sensitivity structures.

  • Buckling control of silicon dioxide diaphragms by lateral stress enhancement for sensitivity improvement of piezoelectric ultrasonic microsensors
    Sensors and Actuators A: Physical, 2011
    Co-Authors: Kaoru Yamashita, T. Watanabe, Tomoya Yoshizaki, Minoru Noda, M. Okuyama
    Abstract:

    Abstract Piezoelectric ultrasonic microsensors have been fabricated using sol–gel derived PZT (Pb(Zr,Ti)O 3 ) thin films on micromachined silicon dioxide diaphragms which are made from a normal silicon wafer instead of the conventional SOI (silicon on insulator) wafer. Layered structure of the PZT capacitor part on the diaphragm has been modified in order to allow the diaphragm to cause a static deflection for sensitivity enhancement by controlling the total lateral stress in the diaphragm. Sensors having an island-like structure in the PZT layer have shown an adequate static deflection due to a lateral stress caused by silicon dioxide film and revealed over 2 times higher sensitivity than conventional sensors.

  • resonant frequency tuning of piezoelectric ultrasonic microsensors by bias voltage application to extra top electrodes on pzt diaphragms
    Ferroelectrics, 2010
    Co-Authors: Kaoru Yamashita, Minoru Noda, Kenji Tomiyama, Keita Yoshikawa, M. Okuyama
    Abstract:

    Tunable ultrasonic microsensors have been fabricated using piezoelectric lead-zirconate-titanate (PZT) thin films on micromachined diaphragm structures with inner- and outer-top electrodes. The inner electrode is used for detecting ultrasonic signal through piezoelectric effect induced by a sound pressure and the outer electrode is used for stress control through converse-piezoelectric effect by applying external dc voltage. Precise fabrication processes have been developed to control buckling of the diaphragms, and two kinds of sensors having flat and buckled diaphragms have been fabricated selectively. The flat and buckled diaphragm sensors have shown reversed characteristics in the voltage-induced frequency shift and have exhibited tunability of +90% and −50%, respectively, under ±8 V application to 1 μm-thick PZT films.

  • diaphragm deflection control of piezoelectric ultrasonic microsensors for sensitivity improvement
    Sensors and Actuators A-physical, 2007
    Co-Authors: Kaoru Yamashita, Hiroki Nishimoto, M. Okuyama
    Abstract:

    Abstract Arrayed ultrasonic microsensors have been fabricated using piezoelectric PZT (Pb(Zr,Ti)O 3 ) thin film on micromachined silicon diaphragm structures. Static deflection of the diaphragms strongly affects the sensitivity; upward-deflected diaphragms show much higher sensitivity than downward-deflected diaphragms. Array sensors have been fabricated using modified processes which enable the diaphragms on a chip to deflect upward, and sensitivity has been successfully improved 4–6 times compared to the downward diaphragms.