Jie Han - Academia.edu (original) (raw)
Papers by Jie Han
Applied Geography, 2020
Abstract Fine-resolution products of land use features (LUFs) and the thermally sharpened infrare... more Abstract Fine-resolution products of land use features (LUFs) and the thermally sharpened infrared data are vital to reveal the land use patterns and their influence on the spatial variability of intra-surface urban heat island (SUHI) effect within cities. In this study, 146 land parcels within downtown Shanghai, China, were selected to investigate the relationship between parcel-based LUFs and intra-SUHI effect through the estimated sensible heat flux approach, by combining a thermal sharpening method and statistical analysis. The results show that the parcels with a dominant OpenSpace exhibited the lowest net blackbody sensible heat flux density (NetBBFD) across the study period. The well-planned parcels featured with high-rise and OpenSpace exhibited lower NetBBFD. In contrast, parcels with dominant categories of low-rise, pavement, other LUFs, and their mosaic, exhibited higher NetBBFD. Furthermore, partial least squares regression (PLSR) models reveal a statistically significant relationship between the Box-Cox transformed parcel-based LUFs and net blackbody sensible heat flux (NetBBF). Variations in the predictors explained approximately 65.7–68.7% of the variance in the responses on hot and warm days, whereas variations of the predictors explained approximately 28.7–28.8% of the variance of the responses on cool and chilly days. The PLSR models also quantified the relative importance of univariate effects and the interactions of changing predictors in terms of their contributions to changing responses. Finally, the uncertainties arising from the datasets and methods as well as the implications for sustainable land development and mitigating the UHI effect were discussed.
Land Degradation & Development, 2020
Energies, 2020
In this study, 167 land parcels of downtown Shanghai, China, were used to investigate the relatio... more In this study, 167 land parcels of downtown Shanghai, China, were used to investigate the relationship between parcel-level land use/land cover (LULC) components and associated summertime intra-surface urban heat island (SUHI) effect, and further analyze the potential of mitigating summertime intra-SUHI effect through the optimized LULC components, by integrating a thermal sharpening method combining the Landsat-8 thermal band 10 data and high-resolution Quickbird image, statistical analysis, and nonlinear programming with constraints. The results show the remarkable variations in intra-surface urban heat island (SUHI) effect, which was measured with the mean parcel-level blackbody sensible heat flux in kW per ha (Mean_pc_BBF). Through measuring the relative importance of each specific predictor in terms of their contributions to changing Mean_pc_BBF, the influence of parcel-level LULC components on excess surface flux of heat energy to the atmosphere was estimated using the partial...
IEEE Transactions on Nanotechnology, 2014
Energy consumption is a major concern in nanoscale CMOS ICs; the power-off operational mode and l... more Energy consumption is a major concern in nanoscale CMOS ICs; the power-off operational mode and low voltage circuits have been proposed to alleviate energy dissipation. Static Random Access Memories (SRAMs) are widely used in today's chips; non-volatile SRAMs (NVSRAMs) have been proposed to preserve data, while providing fast power-on/off speeds. Non-volatile operation is usually accomplished by the use of a Resistive RAM circuit (hence referred to as RRAM); the utilization of a RRAM with an SRAMs not only enables chips to achieve low energy consumption for non-volatile operation, but it also permits to restore data when a restore on power-up is performed (this operation is also commonly referred to as "Instant-on"). This paper presents a novel NVSRAM circuit for "Instant-on" operation and evaluates its performance at nanometric feature sizes. The proposed memory cell consists of a SRAM core (in this case, a 6T cell) and an Oxide Resistive RRAM circuit (1T1R), thus making a 7T1R scheme. The proposed cell offers better non-volatile performance (in terms of operations such as "Store", "Power-down" and "Restore") when compared with existing non-volatile cells. The scenario of multiple-context configuration is also analyzed. Figures of merit such as energy, operational delay and area are also substantially improved, making the proposed design a better scheme for "Instant-on" operation.
Polyhedron, 2012
Abstract 4,4′,4″-[1,3,5-Benzenetriyltris(carbonylimino)]trisbenzoic acid (H3L), a C3-symmetric li... more Abstract 4,4′,4″-[1,3,5-Benzenetriyltris(carbonylimino)]trisbenzoic acid (H3L), a C3-symmetric ligand, was found to self-assemble into an interesting core-rosette structure driven by intermolecular hydrogen-bonding interactions. Reactions of this ligand with Zn2+, Co2+ and Cd2+ under solvothermal conditions resulted in the formation of four new coordination polymers with interesting structural motifs: [Zn2(L)(OH)(H2O)(DMF)]·DMF·H2O (1), [Co3(L)2(DMF)(H2O)]·DMF·3CH3OH (2), [Co1.5(L)(H2O)(DMF)]·DMF (3), and [Cd1.5(L)(H2O)(DMF)]·DMF (4). Single-crystal structural analysis revealed that complex 1 exhibits a rare example of twofold interpenetrating two-dimensional CdI2-type structure with tetranuclear Zn4(μ3-OH)2(COO)6(H2O)(DMF) serving as secondary building unit (SBU), whereas in 2, the μ3-oxo-tricobalt basic carboxylate SBUs are connected by L3− ligands, leading to a twofold interpenetrating three-dimensional (3,6)-net framework. The isomorphous complexes 3 and 4 each has a (4,4)-grid layered architecture in which the SBU is a linear Co3/Cd3 cluster. The four coordination polymers were all further characterized by IR, thermogravimetric and powder X-ray diffraction (PXRD).
Macromolecular Rapid Communications, 2011
Journal of Nanoparticle Research, 2012
In this article, a bio-inspired silk-mediated method was established to produce natural materialm... more In this article, a bio-inspired silk-mediated method was established to produce natural materialmodified photoluminescent zinc oxide nanoparticles (nano-ZnO). Silk fibroin fibers were employed as the reactive substrates to synthesize nano-ZnO, and silk fibroins (SF) were taken as the biocompatible stabilizers to modify dispersed nano-ZnO. As-prepared nano-ZnO were mainly hexagonal phase particles with diameter around 13 nm. The resulting nano-ZnO/SF hybrids displayed orange emission and good biocompatibility in aqueous system.
Journal of Nanoparticle Research, 2009
CdS nanocrystallites could be formed and assembled into nanoparticle strings and hexagons on natu... more CdS nanocrystallites could be formed and assembled into nanoparticle strings and hexagons on natural silk fibroin fiber (SFF) through a roomtemperature bio-inspired process. Herein, the biomaterial SFF served as reactive substrate, not only provides the in situ formation sites for CdS nanocrystallites, but also directs the arrangement of nanocrystalline CdS simultaneously. The photoluminescence (PL) of the resulting nanocomposites CdS/SFF is investigated extensively. The PL peaks observed from CdS nanoparticle strings are similar to those of separate CdS nanoparticles, corresponding to the band-edge emission of their individual building blocks (QD-CdS). Moreover, CdS nanoparticle hexagons perform a red-shifted and broadened emission peak.
Journal of Hydraulic Research, 2012
Wetland flow is currently actively studied because of its applications in stormwater management, ... more Wetland flow is currently actively studied because of its applications in stormwater management, wastewater treatment and habitat restoration. This research applies the well-established poroelastic media flow theory to uniform laminar wetland flow through submerged and floating vegetation, where the linear interaction between the pore water and the vegetation skeleton is considered in the equations of motion. The effects of vegetation porosity on the velocity, the shear stress and the energy distributions in different layers are first derived analytically and interpreted graphically and physically. As special cases, the homogeneous water flow, as also floating, submerged and emergent vegetation flows are then discussed. This research provides qualitative understanding of wetland flow on velocity, shear stress and energy distributions, indicating that a plant applies a significant resistance to the flow system and dissipates most of the flow energy. The results serve a benchmark framework for the future study on turbulent vegetation flow.
IEEE Transactions on Nanotechnology, 2013
This paper presents the characterization and design of a Static Random Access Memory (SRAM) cell ... more This paper presents the characterization and design of a Static Random Access Memory (SRAM) cell at nano scale ranges. The proposed SRAM cell incorporates a Single-Electron (SE) turnstile and a Single-Electron Transistor (SET)/MOS circuit in its operation, hence the hybrid nature. Differently from previous cells, the hybrid circuit is utilized to sense (measure) on a voltage-basis the presence of at least an electron as stored in memory, while the turnstile enables the single electron transfer in and out of the storage node. The two memory operations (read and write) are facilitated by utilizing these hybrid circuits; moreover the proposed SRAM cell shows compatibility with MOSFET technology. HSPICE simulation shows that the proposed SRAM cell operates correctly at 45 and 32 nm with good performance in terms of propagation delay, signal integrity, area, stability and power consumption. The extension of the above hybrid design to a Ternary Content Addressable Memory (TCAM) cell is also presented.
Chemical Engineering Journal, 2012
h i g h l i g h t s " Rapid degradation of estrone by ZnO under artificial UVA or solar irradiati... more h i g h l i g h t s " Rapid degradation of estrone by ZnO under artificial UVA or solar irradiation. " Markedly faster estrone degradation by ZnO than P25 TiO 2 under UVA irradiation. " Higher UV absorbance on ZnO than P25 TiO 2 in the 320-385 nm region. " Higher concentrations of H 2 O 2 generated in UV-irradiated ZnO suspension.
![Research paper thumbnail of Reply to comments on “Three layer model for vertical velocity distribution in open channel flow with submerged rigid vegetation” by Huai WX, Zeng YH, Xu ZG, Yang ZH [Adv Water Resour 32 (2009) 487–92]](https://attachments.academia-assets.com/88355184/thumbnails/1.jpg)
](Advances in Water Resources, 2009
We study the nature of tunneling phase time for various quantum mechanical structures such as net... more We study the nature of tunneling phase time for various quantum mechanical structures such as networks and rings having potential barriers in their arms. We find the generic presence of Hartman effect, with superluminal velocities as a consequence, in these systems. In quantum networks it is possible to control the 'super arrival' time in one of the arms by changing the parameters on another arm which is spatially separated from it. This is yet another quantum nonlocal effect. Negative time delays (time advancement) and 'ultra Hartman effect' with negative saturation times have been observed in some parameter regimes. In presence and absence of Aharonov-Bohm (AB) flux quantum rings show Hartman effect. We obtain the analytical expression for the saturated phase time. In the opaque barrier regime this is independent of even the AB flux thereby generalizing the Hartman effect. We also briefly discuss the concept of "space collapse or space destroyer" by introducing a free space in between two barriers covering the ring. Further we show in presence of absorption the reflection phase time exhibits Hartman effect in contrast to the transmission phase time.
Advanced Functional Materials, 2009
Abstract A novel method has been developed to synthesize gold nanoparticles with tunable size and... more Abstract A novel method has been developed to synthesize gold nanoparticles with tunable size and morphology supported on both inner and outer surfaces of poly (o-phenylenediamine)(PoPD) hollow microspheres, which act as both reductant and ...
Acta Crystallographica Section E Structure Reports Online, 2011
Transportation Research Record: Journal of the Transportation Research Board, 2004
Fourteen model soil-cement columns were installed in two containers in the laboratory to investig... more Fourteen model soil-cement columns were installed in two containers in the laboratory to investigate the influence of mixing energy consumption on the unconfined compressive strength of soil-cement mixtures by varying mixing conditions. The variables of mixing conditions included cement content, speed of installation (mixing down and up), rate of mixer rotation, number of mixing cycles, and column length. Electric power was measured during the installation of all the model columns. The factors that influenced the mixing energy consumption during the installation were evaluated, and a relationship between the mixing energy consumption and the unconfined compressive strength of soil-cement mixtures was developed. This relationship was compared with that obtained in the laboratory soil-quicklime mixing tests from another study. The test results show that the unconfined compressive strength increases with an increase of mixing energy consumption, up to a threshold value. Any further inc...
Applied Geography, 2020
Abstract Fine-resolution products of land use features (LUFs) and the thermally sharpened infrare... more Abstract Fine-resolution products of land use features (LUFs) and the thermally sharpened infrared data are vital to reveal the land use patterns and their influence on the spatial variability of intra-surface urban heat island (SUHI) effect within cities. In this study, 146 land parcels within downtown Shanghai, China, were selected to investigate the relationship between parcel-based LUFs and intra-SUHI effect through the estimated sensible heat flux approach, by combining a thermal sharpening method and statistical analysis. The results show that the parcels with a dominant OpenSpace exhibited the lowest net blackbody sensible heat flux density (NetBBFD) across the study period. The well-planned parcels featured with high-rise and OpenSpace exhibited lower NetBBFD. In contrast, parcels with dominant categories of low-rise, pavement, other LUFs, and their mosaic, exhibited higher NetBBFD. Furthermore, partial least squares regression (PLSR) models reveal a statistically significant relationship between the Box-Cox transformed parcel-based LUFs and net blackbody sensible heat flux (NetBBF). Variations in the predictors explained approximately 65.7–68.7% of the variance in the responses on hot and warm days, whereas variations of the predictors explained approximately 28.7–28.8% of the variance of the responses on cool and chilly days. The PLSR models also quantified the relative importance of univariate effects and the interactions of changing predictors in terms of their contributions to changing responses. Finally, the uncertainties arising from the datasets and methods as well as the implications for sustainable land development and mitigating the UHI effect were discussed.
Land Degradation & Development, 2020
Energies, 2020
In this study, 167 land parcels of downtown Shanghai, China, were used to investigate the relatio... more In this study, 167 land parcels of downtown Shanghai, China, were used to investigate the relationship between parcel-level land use/land cover (LULC) components and associated summertime intra-surface urban heat island (SUHI) effect, and further analyze the potential of mitigating summertime intra-SUHI effect through the optimized LULC components, by integrating a thermal sharpening method combining the Landsat-8 thermal band 10 data and high-resolution Quickbird image, statistical analysis, and nonlinear programming with constraints. The results show the remarkable variations in intra-surface urban heat island (SUHI) effect, which was measured with the mean parcel-level blackbody sensible heat flux in kW per ha (Mean_pc_BBF). Through measuring the relative importance of each specific predictor in terms of their contributions to changing Mean_pc_BBF, the influence of parcel-level LULC components on excess surface flux of heat energy to the atmosphere was estimated using the partial...
IEEE Transactions on Nanotechnology, 2014
Energy consumption is a major concern in nanoscale CMOS ICs; the power-off operational mode and l... more Energy consumption is a major concern in nanoscale CMOS ICs; the power-off operational mode and low voltage circuits have been proposed to alleviate energy dissipation. Static Random Access Memories (SRAMs) are widely used in today's chips; non-volatile SRAMs (NVSRAMs) have been proposed to preserve data, while providing fast power-on/off speeds. Non-volatile operation is usually accomplished by the use of a Resistive RAM circuit (hence referred to as RRAM); the utilization of a RRAM with an SRAMs not only enables chips to achieve low energy consumption for non-volatile operation, but it also permits to restore data when a restore on power-up is performed (this operation is also commonly referred to as "Instant-on"). This paper presents a novel NVSRAM circuit for "Instant-on" operation and evaluates its performance at nanometric feature sizes. The proposed memory cell consists of a SRAM core (in this case, a 6T cell) and an Oxide Resistive RRAM circuit (1T1R), thus making a 7T1R scheme. The proposed cell offers better non-volatile performance (in terms of operations such as "Store", "Power-down" and "Restore") when compared with existing non-volatile cells. The scenario of multiple-context configuration is also analyzed. Figures of merit such as energy, operational delay and area are also substantially improved, making the proposed design a better scheme for "Instant-on" operation.
Polyhedron, 2012
Abstract 4,4′,4″-[1,3,5-Benzenetriyltris(carbonylimino)]trisbenzoic acid (H3L), a C3-symmetric li... more Abstract 4,4′,4″-[1,3,5-Benzenetriyltris(carbonylimino)]trisbenzoic acid (H3L), a C3-symmetric ligand, was found to self-assemble into an interesting core-rosette structure driven by intermolecular hydrogen-bonding interactions. Reactions of this ligand with Zn2+, Co2+ and Cd2+ under solvothermal conditions resulted in the formation of four new coordination polymers with interesting structural motifs: [Zn2(L)(OH)(H2O)(DMF)]·DMF·H2O (1), [Co3(L)2(DMF)(H2O)]·DMF·3CH3OH (2), [Co1.5(L)(H2O)(DMF)]·DMF (3), and [Cd1.5(L)(H2O)(DMF)]·DMF (4). Single-crystal structural analysis revealed that complex 1 exhibits a rare example of twofold interpenetrating two-dimensional CdI2-type structure with tetranuclear Zn4(μ3-OH)2(COO)6(H2O)(DMF) serving as secondary building unit (SBU), whereas in 2, the μ3-oxo-tricobalt basic carboxylate SBUs are connected by L3− ligands, leading to a twofold interpenetrating three-dimensional (3,6)-net framework. The isomorphous complexes 3 and 4 each has a (4,4)-grid layered architecture in which the SBU is a linear Co3/Cd3 cluster. The four coordination polymers were all further characterized by IR, thermogravimetric and powder X-ray diffraction (PXRD).
Macromolecular Rapid Communications, 2011
Journal of Nanoparticle Research, 2012
In this article, a bio-inspired silk-mediated method was established to produce natural materialm... more In this article, a bio-inspired silk-mediated method was established to produce natural materialmodified photoluminescent zinc oxide nanoparticles (nano-ZnO). Silk fibroin fibers were employed as the reactive substrates to synthesize nano-ZnO, and silk fibroins (SF) were taken as the biocompatible stabilizers to modify dispersed nano-ZnO. As-prepared nano-ZnO were mainly hexagonal phase particles with diameter around 13 nm. The resulting nano-ZnO/SF hybrids displayed orange emission and good biocompatibility in aqueous system.
Journal of Nanoparticle Research, 2009
CdS nanocrystallites could be formed and assembled into nanoparticle strings and hexagons on natu... more CdS nanocrystallites could be formed and assembled into nanoparticle strings and hexagons on natural silk fibroin fiber (SFF) through a roomtemperature bio-inspired process. Herein, the biomaterial SFF served as reactive substrate, not only provides the in situ formation sites for CdS nanocrystallites, but also directs the arrangement of nanocrystalline CdS simultaneously. The photoluminescence (PL) of the resulting nanocomposites CdS/SFF is investigated extensively. The PL peaks observed from CdS nanoparticle strings are similar to those of separate CdS nanoparticles, corresponding to the band-edge emission of their individual building blocks (QD-CdS). Moreover, CdS nanoparticle hexagons perform a red-shifted and broadened emission peak.
Journal of Hydraulic Research, 2012
Wetland flow is currently actively studied because of its applications in stormwater management, ... more Wetland flow is currently actively studied because of its applications in stormwater management, wastewater treatment and habitat restoration. This research applies the well-established poroelastic media flow theory to uniform laminar wetland flow through submerged and floating vegetation, where the linear interaction between the pore water and the vegetation skeleton is considered in the equations of motion. The effects of vegetation porosity on the velocity, the shear stress and the energy distributions in different layers are first derived analytically and interpreted graphically and physically. As special cases, the homogeneous water flow, as also floating, submerged and emergent vegetation flows are then discussed. This research provides qualitative understanding of wetland flow on velocity, shear stress and energy distributions, indicating that a plant applies a significant resistance to the flow system and dissipates most of the flow energy. The results serve a benchmark framework for the future study on turbulent vegetation flow.
IEEE Transactions on Nanotechnology, 2013
This paper presents the characterization and design of a Static Random Access Memory (SRAM) cell ... more This paper presents the characterization and design of a Static Random Access Memory (SRAM) cell at nano scale ranges. The proposed SRAM cell incorporates a Single-Electron (SE) turnstile and a Single-Electron Transistor (SET)/MOS circuit in its operation, hence the hybrid nature. Differently from previous cells, the hybrid circuit is utilized to sense (measure) on a voltage-basis the presence of at least an electron as stored in memory, while the turnstile enables the single electron transfer in and out of the storage node. The two memory operations (read and write) are facilitated by utilizing these hybrid circuits; moreover the proposed SRAM cell shows compatibility with MOSFET technology. HSPICE simulation shows that the proposed SRAM cell operates correctly at 45 and 32 nm with good performance in terms of propagation delay, signal integrity, area, stability and power consumption. The extension of the above hybrid design to a Ternary Content Addressable Memory (TCAM) cell is also presented.
Chemical Engineering Journal, 2012
h i g h l i g h t s " Rapid degradation of estrone by ZnO under artificial UVA or solar irradiati... more h i g h l i g h t s " Rapid degradation of estrone by ZnO under artificial UVA or solar irradiation. " Markedly faster estrone degradation by ZnO than P25 TiO 2 under UVA irradiation. " Higher UV absorbance on ZnO than P25 TiO 2 in the 320-385 nm region. " Higher concentrations of H 2 O 2 generated in UV-irradiated ZnO suspension.
Advances in Water Resources, 2009
We study the nature of tunneling phase time for various quantum mechanical structures such as net... more We study the nature of tunneling phase time for various quantum mechanical structures such as networks and rings having potential barriers in their arms. We find the generic presence of Hartman effect, with superluminal velocities as a consequence, in these systems. In quantum networks it is possible to control the 'super arrival' time in one of the arms by changing the parameters on another arm which is spatially separated from it. This is yet another quantum nonlocal effect. Negative time delays (time advancement) and 'ultra Hartman effect' with negative saturation times have been observed in some parameter regimes. In presence and absence of Aharonov-Bohm (AB) flux quantum rings show Hartman effect. We obtain the analytical expression for the saturated phase time. In the opaque barrier regime this is independent of even the AB flux thereby generalizing the Hartman effect. We also briefly discuss the concept of "space collapse or space destroyer" by introducing a free space in between two barriers covering the ring. Further we show in presence of absorption the reflection phase time exhibits Hartman effect in contrast to the transmission phase time.
Advanced Functional Materials, 2009
Abstract A novel method has been developed to synthesize gold nanoparticles with tunable size and... more Abstract A novel method has been developed to synthesize gold nanoparticles with tunable size and morphology supported on both inner and outer surfaces of poly (o-phenylenediamine)(PoPD) hollow microspheres, which act as both reductant and ...
Acta Crystallographica Section E Structure Reports Online, 2011
Transportation Research Record: Journal of the Transportation Research Board, 2004
Fourteen model soil-cement columns were installed in two containers in the laboratory to investig... more Fourteen model soil-cement columns were installed in two containers in the laboratory to investigate the influence of mixing energy consumption on the unconfined compressive strength of soil-cement mixtures by varying mixing conditions. The variables of mixing conditions included cement content, speed of installation (mixing down and up), rate of mixer rotation, number of mixing cycles, and column length. Electric power was measured during the installation of all the model columns. The factors that influenced the mixing energy consumption during the installation were evaluated, and a relationship between the mixing energy consumption and the unconfined compressive strength of soil-cement mixtures was developed. This relationship was compared with that obtained in the laboratory soil-quicklime mixing tests from another study. The test results show that the unconfined compressive strength increases with an increase of mixing energy consumption, up to a threshold value. Any further inc...