Ge Zhu - Academia.edu (original) (raw)

Papers by Ge Zhu

Atmosphere

While the visible plume from a cooling tower is not a pollutant, it can affect the surrounding en... more While the visible plume from a cooling tower is not a pollutant, it can affect the surrounding environment. Moreover, the accompanied evaporation loss has a great potential for wastewater recovery. In the present study, a novel coupling technology for water conservation and plume abatement was proposed, and its feasibility was verified by using thermodynamic analysis. A surface-type heat exchanger was designed and a thermodynamic calculation model was established. Next, based on the principle of “no plume,” the effect of the number of heat exchanger units (N) and the circulating water volume (G) on the water conservation and plume abatement was evaluated under design condition. Results showed that the optimized parameters for the operation of the cooling towers were N = 8 and G < 3000 m3/h, which have a good effect on water conservation and plume abatement. Furthermore, as per the condensation calculation model, the average water conservation amount was 1.105 kg/s and the annual ...

IEEE Signal Processing Letters

Fully-supervised models for source separation are trained on parallel mixture-source data and are... more Fully-supervised models for source separation are trained on parallel mixture-source data and are currently stateof-the-art. However, such parallel data is often difficult to obtain, and it is cumbersome to adapt trained models to mixtures with new sources. Source-only supervised models, in contrast, only require individual source data for training. In this paper, we first leverage flow-based generators to train individual music source priors and then use these models, along with likelihood-based objectives, to separate music mixtures. We show that in singing voice separation and music separation tasks, our proposed method is competitive with a fully-supervised approach. We also demonstrate that we can flexibly add new types of sources, whereas fully-supervised approaches would require retraining of the entire model.

Inorganic Chemistry Frontiers, 2021

The RBPO:Eu3+ phosphor developed by the nonlinear optical material-inspired methodology can serve... more The RBPO:Eu3+ phosphor developed by the nonlinear optical material-inspired methodology can serve as a potential candidate in solid state lighting applications, artistic appreciation or some applications under extreme conditions.

Atmospheric Environment, 2021

Coal is China’s main energy, and this situation in the future in a long period of time is unlikel... more Coal is China’s main energy, and this situation in the future in a long period of time is unlikely to have fundamental changes. As an underground activity, coal mining inevitably causes local damage and pollution to underground water cut system due to improper application of coal mining technology. And a large number of mine drainage, not only need to spend a lot of drainage costs, increase the cost of coal production, but also waste very valuable water resources. In this paper, based on the water - coal, on the basis of coordination development, through big data analysis methods, proposes the establishment process of coal mining and mine water quality, and the whole life cycle of the coal - water coordination development precision control technology system, through a series of research on the laws of the evolution of time and space and nonlinear multiobjective model building and simulation development plan, research and development of the evaluation method of mine water resource ut...

It is difficult to control consistency of light source and large volume in current linear time-gr... more It is difficult to control consistency of light source and large volume in current linear time-grating displacement sensor with four-channel alternating light field. A novel integrated linear time-grating displacement measurement system with single alternating light field is proposed. Single alternating light field and micro-controlling phase-shift method are used to synthesize a signal of traveling wave. And the measurement of linear displacement is achieved by measuring a difference of zero-crossing time between a signal of traveling wave and a reference signal. Design of structural miniaturization, design of integrated circuit, design of transmitting surface of cosine and design of optimization of existing time-grating displacement sensor are analyzed in detail. According to measuring principle, manufacture of light source and photoelectric receiver are completed, and corresponding experimental platform is built. Experimental results indicate that the measuring errors of optimize...

Arabian Journal for Science and Engineering, 2021

The current research on hydraulic fracturing with unstable injection mainly focuses on laboratory... more The current research on hydraulic fracturing with unstable injection mainly focuses on laboratory experiments or field tests. However, due to the difference in scale, some conclusions derived from laboratory experiments are not suitable for field applications. Besides, there is little research on coupling analysis of transient flow in tubing and seepage in reservoir during fracturing. In this paper, the transient dynamic model of fluid in tubing and the model of unsteady seepage in reservoir were established, respectively. Furthermore, the simulation model was established by parameters coupling, which took into account the influence of reservoir breakdown on permeability. The variation of fluid pressure in the tubing of different scale was analyzed during unstable injection. Simultaneously, the amplitude frequency characteristics of fluid in the tubing were also compared between laboratory scale and field scale. The results show that the simulation model can be used to calculate the fluid pressure variation in the whole process of hydraulic fracturing. And the simulation results are basically consistent with the experimental results. The scale difference has a significant impact on the variation of fluid pressure in tubing. To improve the fluctuation amplitude of outlet pressure, it is necessary to design the frequency according to the amplitude frequency characteristics of the corresponding scale model. It can also be achieved by reducing the resistance coefficient. The research can provide guidance for parameters design in field applications. It is conducive to understand the difference between laboratory experiments and field applications.

Dalton Transactions, 2020

Structure, luminescence property, and mechanism investigation of a valence-variation-induced tuna... more Structure, luminescence property, and mechanism investigation of a valence-variation-induced tunable white-light emission of a novel stannate phosphor with robust thermal stability.

Small, 2021

Defects are considered to be one of the most significant factors that compromise the power conver... more Defects are considered to be one of the most significant factors that compromise the power conversion efficiencies and long-term stability of perovskite solar cells. Therefore, it is urgent to have a profound understanding of their formation and influence mechanism, so as to take corresponding measures to suppress or even completely eliminate their adverse effects on device performance. Herein, the possible origins of the defects in metal halide perovskite films and their impacts on the device performance are analyzed, and then various methods to reduce defect density are introduced in detail. Starting from the internal and interfacial aspects of the metal halide perovskite films, several ways to improve device performance and long-term stability including additive engineering, surface passivation, and other physical treatments (annealing engineering), etc., are further elaborated. Finally, the further understanding of defects and the development trend of passivation strategies are prospected.

Journal of Environmental Management, 2022

Biodegradation of pyridine starts with two mono-oxygenation reactions, and 2-hydroxyl pyridine (2... more Biodegradation of pyridine starts with two mono-oxygenation reactions, and 2-hydroxyl pyridine (2-HP) accumulates as pyridine is mono-oxygenated in the first reaction. The accumulation of 2-HP inhibits both initial reactions. Therefore, selective acceleration of the second mono-oxygenation reaction should significantly enhance pyridine transformation and mineralization. Activated-sludge biomass was separately acclimated with pyridine or 2-HP to produce pyridine- and 2-HP-acclimated biomasses. The pyridine-acclimated biomass was superior for pyridine biodegradation, but the 2-HP-acclimated biomass was superior for 2-HP biodegradation. As a consequence, the pyridine-acclimated biomass by itself achieved faster mono-oxygenation of pyridine to 2-HP, but 2-HP accumulated, which limited mineralization to 60%. In contrast, mineralization reached 90% when one-third of the pyridine-acclimated was replaced with 2-HP-acclimated biomass, because 2-HP did not accumulate during pyridine biodegradation. The lack of 2-HP accumulation relieved its inhibition: e.g., the pyridine removal rates, normalized to the mass of pyridine-acclimated biomass, increased from 0.52 to 0.57 mM0.5⋅h-1 when one-third of the pyridine-acclimated biomass was replaced by 2-HP-acclimated biomass. Phylogenetic analysis showed that microbiological communities of pyridine-acclimated biomass and 2-HP-acclimated biomass differed in important ways. On the one hand, the 2-HP-acclimated biomass was richer and dominated by a rare biosphere, or genera having <0.1% of total reads. On the other hand, the most-enriched genus in the pyridine-acclimated community (Methylibium) is associated with the first mono-oxygenation of pyridine, while enriched genera in the 2-HP-acclimated community (Sediminibacterium and Dokdonella) are associated with the second mono-oxygenation of pyridine.

GPS Solutions, 2021

Reanalysis products have been applied to calculate the tropospheric delay for Global Navigation S... more Reanalysis products have been applied to calculate the tropospheric delay for Global Navigation Satellite System (GNSS) positioning purposes widely. It is necessary to obtain high-precision tropospheric delay information from GNSS users with a high-precision tropospheric vertical stratification model because the height of the grids of the atmospheric reanalysis data is inconsistent with that of GNSS users, especially in regions with high terrains. In addition, the variation of the tropospheric delay in the vertical direction is much higher than that in the horizontal direction. The zenith total delay (ZTD) vertical stratification model is also key to the development of real-time and high-precision ZTD models. A new approach, the sliding window algorithm, is proposed to develop a ZTD vertical stratification model. In this work, a ZTD vertical stratification model considering spatiotemporal factors is developed based on the second Modern-Era Retrospective analysis for Research and Applications (MERRA-2) data, which is named the GZTD-H model. Radiosonde and International GNSS Service (IGS) data are treated as reference values to evaluate the performance of the GZTD-H model, which is compared to the model GPT2w. The results show that the GZTD-H model realizes the highest performance in ZTD layered vertical interpolation against ZTD layered profiles obtained at radiosonde sites, which achieves an improvement of 10% over the model GPT2w. Compared to model GPT2w, the GZTD-H model attains a spatial interpolation improvement of 8% for the Global Geodetic Observing System (GGOS) Atmosphere gridded ZTD over the surface ZTD calculated from radiosonde profiles. Furthermore, compared to model GPT2w, the model GZTD-H also attains improvements of 11% over the precise ZTD products acquired at IGS sites. In terms of model parameters, the GZTD-H model is greatly reduced and optimized over model GPT2w. Hence, the applicability of this model is enhanced in terms of GNSS atmospheric sounding and precise GNSS positioning.

The Journal of the Acoustical Society of America, 2018

It is common to increase the number of measurement points to improve the robustness of multipoint... more It is common to increase the number of measurement points to improve the robustness of multipoint room equalization. However, the measurement of numerous points is extremely time-consuming and laborious. This letter analyzes the early reflections extracted from a large amount of room impulse responses using a K-means clustering algorithm, revealing that the spatial distribution of early reflections in the same cluster is not disorganized but regular and predictable. Furthermore, the results of the Monte Carlo simulation suggest that the appropriate selection of measurement positions can reduce the number of measurement points without compromising the robustness of multipoint room equalization.

Remote Sensing, 2021

Pressure, water vapor pressure, temperature, and weighted mean temperature (Tm) are tropospheric ... more Pressure, water vapor pressure, temperature, and weighted mean temperature (Tm) are tropospheric parameters that play an important role in high-precision global navigation satellite system navigation (GNSS). As accurate tropospheric parameters are obligatory in GNSS navigation and GNSS water vapor detection, high-precision modeling of tropospheric parameters has gained widespread attention in recent years. A new approach is introduced to develop an empirical tropospheric delay model named the China Tropospheric (CTrop) model, providing meteorological parameters based on the sliding window algorithm. The radiosonde data in 2017 are treated as reference values to validate the performance of the CTrop model, which is compared to the canonical Global Pressure and Temperature 3 (GPT3) model. The accuracy of the CTrop model in regards to pressure, water vapor pressure, temperature, and weighted mean temperature are 5.51 hPa, 2.60 hPa, 3.09 K, and 3.35 K, respectively, achieving an improve...

Journal of Alloys and Compounds, 2021

Abstract An understanding on the site preference of luminescence centers in phosphors serves as a... more Abstract An understanding on the site preference of luminescence centers in phosphors serves as a starting point to illustrate the relationship between structure and luminescence. Till now, various methods such as theoretical calculation or modern testing techniques are employed to analyze their luminescent behavior and intrinsic mechanism. The present study proposes a local structure modification method to confirm the site occupation of Eu2+ ions in a whitlockite-type phosphor Sr18Mg3(PO4)14: Eu2+. The result shows that Eu2+ ions can not only occupy Sr2+ sites but also substitute partial Mg2+ sites in Sr18Mg3(PO4)14. Owing to this, three emission bands centered at 420 (blue), 520 (green) and 620 nm (red) are simultaneously observed upon ultraviolet light excitation, resulting in a full color emission in Sr18Mg3(PO4)14: Eu2+ phosphors. Meanwhile, the detailed structure information of Sr18Mg3(PO4)14 are renewedly evaluated and the optical spectroscopy property, decay curves and thermal quenching behavior as well as related mechanism of Sr18Mg3(PO4)14: Eu2+ are studied in detail. Finally, an ultraviolet light pumped white LED is fabricated with suitable CCT of 4663 K and high Ra of 82. The current analysis provides a deep insight into the origin of Eu2+ luminescence and its relationship with local lattice environment, which paves a new avenue to identify the site preference of luminescence centers.

Journal of Cleaner Production, 2020

Influence of mining activities on groundwater hydrochemistry and heavy metal migration using a se... more Influence of mining activities on groundwater hydrochemistry and heavy metal migration using a self-organizing map (SOM), (2020),

Journal of Clinical Pharmacy and Therapeutics, 2021

Ankylosing spondylitis (AS) and psoriatic arthritis (PsA) are chronic inflammatory rheumatic dise... more Ankylosing spondylitis (AS) and psoriatic arthritis (PsA) are chronic inflammatory rheumatic diseases that have an insidiously progressive and debilitating effect on the axial skeleton and share the same clinical and radiographic features, which have a strong overlap correlation with the HLA-B27 gene. 1 AS usually starts before age 40 with male predominance. 2 Patients may present with low back pain, spinal stiffness, hip, knee or ankle pain. As the disease progresses, the patient may develop a hunchback. Reduced mobility and axial deformity affect daily life and work. 2 PsA was recognized as another key member of the spondyloarthropathies (SpA). It occurs in up to 30% of people with psoriasis and can have severe impacts on peripheral joints, spine, tendon insertions and fingers. 3 Predominantly, axial psoriatic arthritis is usually regarded as a late stage in the PsA disease course. The cardinal manifestation is inflammatory back pain, limited motion and tenderness around the sacroiliac joints. 4 However, AS patients appear to have more back pain and limitation of spinal mobility 5,6 due to the pathological changes in the hip joint and continuous changes in the spine compared with PsA.

Journal of Energy Chemistry, 2021

Recently, perovskite solar cells (PSCs) have flourished, and their power conversion efficiency (P... more Recently, perovskite solar cells (PSCs) have flourished, and their power conversion efficiency (PCE) has increased from the initial 3.8% to 25.2% in 2019, which is an unprecedented advance. However, usually high-efficiency and stable PSCs are small-area devices prepared by spin coating. This method is not suitable for the preparation of large-area devices in commercialization. Therefore, there is an urgent need to develop new materials and methods for the scalable fabrication of PSCs. In this review, we first describe the common small-area PSCs preparation methods, understand the nucleation and crystal growth kinetics of perovskite, and analyze the reasons that hinder the development of small-area devices to large-area devices. Next, in order to meet the challenges of PSC's scalable fabrication, we summarize and analyze four strategies: scaling up precursor solutions, scalable deposition methods for large-area films, scaling up charge-transport layers and back electrodes, developing solar modules. Finally, challenges and prospects are proposed to help researchers prepare high-efficiency large-area PSCs.

Science of The Total Environment, 2021

Para-nitrophenol (PNP) is often detected in industrial wastewater that is discharged into municip... more Para-nitrophenol (PNP) is often detected in industrial wastewater that is discharged into municipal wastewater treatment plants. Intermittent discharge of PNP into municipal treatment facilities puts their biological process at risk of inhibition, and the risk is especially great for nitrification. In this work, nitrifying biomass was acclimated to PNP. The acclimated biomass retained most of its ammonium-removal activity when it was exposed to PNP at up to 100 mg/L, while the normal (unacclimated) biomass had nearly complete inhibition. PNP was effectively biodegraded by the acclimated biomass, but the normal biomass had minimal PNP biodegradation. After PNP disappeared, the acclimated biomass recovered its ability for NH4+-N removals within one to two days, but the normal biomass did not fully recovery even after seven days. The acclimated biomass had superior ability to sustain nitrification due to its ability to biodegrade PNP and its selection of nitrifying bacteria more resistant to PNP. The PNP-acclimated community was enriched in genera that could have been active in the biodegradation of PNP, such as Chloroflexi. Although the abundance of well-known nitrifiers, Nitrosomonas and Nitrospira, decreased, Nitrosospira and other genera within the Proetobacteria phylum increased, presumably because they were more resistant to PNP.

Atmosphere

While the visible plume from a cooling tower is not a pollutant, it can affect the surrounding en... more While the visible plume from a cooling tower is not a pollutant, it can affect the surrounding environment. Moreover, the accompanied evaporation loss has a great potential for wastewater recovery. In the present study, a novel coupling technology for water conservation and plume abatement was proposed, and its feasibility was verified by using thermodynamic analysis. A surface-type heat exchanger was designed and a thermodynamic calculation model was established. Next, based on the principle of “no plume,” the effect of the number of heat exchanger units (N) and the circulating water volume (G) on the water conservation and plume abatement was evaluated under design condition. Results showed that the optimized parameters for the operation of the cooling towers were N = 8 and G < 3000 m3/h, which have a good effect on water conservation and plume abatement. Furthermore, as per the condensation calculation model, the average water conservation amount was 1.105 kg/s and the annual ...

IEEE Signal Processing Letters

Fully-supervised models for source separation are trained on parallel mixture-source data and are... more Fully-supervised models for source separation are trained on parallel mixture-source data and are currently stateof-the-art. However, such parallel data is often difficult to obtain, and it is cumbersome to adapt trained models to mixtures with new sources. Source-only supervised models, in contrast, only require individual source data for training. In this paper, we first leverage flow-based generators to train individual music source priors and then use these models, along with likelihood-based objectives, to separate music mixtures. We show that in singing voice separation and music separation tasks, our proposed method is competitive with a fully-supervised approach. We also demonstrate that we can flexibly add new types of sources, whereas fully-supervised approaches would require retraining of the entire model.

Inorganic Chemistry Frontiers, 2021

The RBPO:Eu3+ phosphor developed by the nonlinear optical material-inspired methodology can serve... more The RBPO:Eu3+ phosphor developed by the nonlinear optical material-inspired methodology can serve as a potential candidate in solid state lighting applications, artistic appreciation or some applications under extreme conditions.

Atmospheric Environment, 2021

Coal is China’s main energy, and this situation in the future in a long period of time is unlikel... more Coal is China’s main energy, and this situation in the future in a long period of time is unlikely to have fundamental changes. As an underground activity, coal mining inevitably causes local damage and pollution to underground water cut system due to improper application of coal mining technology. And a large number of mine drainage, not only need to spend a lot of drainage costs, increase the cost of coal production, but also waste very valuable water resources. In this paper, based on the water - coal, on the basis of coordination development, through big data analysis methods, proposes the establishment process of coal mining and mine water quality, and the whole life cycle of the coal - water coordination development precision control technology system, through a series of research on the laws of the evolution of time and space and nonlinear multiobjective model building and simulation development plan, research and development of the evaluation method of mine water resource ut...

It is difficult to control consistency of light source and large volume in current linear time-gr... more It is difficult to control consistency of light source and large volume in current linear time-grating displacement sensor with four-channel alternating light field. A novel integrated linear time-grating displacement measurement system with single alternating light field is proposed. Single alternating light field and micro-controlling phase-shift method are used to synthesize a signal of traveling wave. And the measurement of linear displacement is achieved by measuring a difference of zero-crossing time between a signal of traveling wave and a reference signal. Design of structural miniaturization, design of integrated circuit, design of transmitting surface of cosine and design of optimization of existing time-grating displacement sensor are analyzed in detail. According to measuring principle, manufacture of light source and photoelectric receiver are completed, and corresponding experimental platform is built. Experimental results indicate that the measuring errors of optimize...

Arabian Journal for Science and Engineering, 2021

The current research on hydraulic fracturing with unstable injection mainly focuses on laboratory... more The current research on hydraulic fracturing with unstable injection mainly focuses on laboratory experiments or field tests. However, due to the difference in scale, some conclusions derived from laboratory experiments are not suitable for field applications. Besides, there is little research on coupling analysis of transient flow in tubing and seepage in reservoir during fracturing. In this paper, the transient dynamic model of fluid in tubing and the model of unsteady seepage in reservoir were established, respectively. Furthermore, the simulation model was established by parameters coupling, which took into account the influence of reservoir breakdown on permeability. The variation of fluid pressure in the tubing of different scale was analyzed during unstable injection. Simultaneously, the amplitude frequency characteristics of fluid in the tubing were also compared between laboratory scale and field scale. The results show that the simulation model can be used to calculate the fluid pressure variation in the whole process of hydraulic fracturing. And the simulation results are basically consistent with the experimental results. The scale difference has a significant impact on the variation of fluid pressure in tubing. To improve the fluctuation amplitude of outlet pressure, it is necessary to design the frequency according to the amplitude frequency characteristics of the corresponding scale model. It can also be achieved by reducing the resistance coefficient. The research can provide guidance for parameters design in field applications. It is conducive to understand the difference between laboratory experiments and field applications.

Dalton Transactions, 2020

Structure, luminescence property, and mechanism investigation of a valence-variation-induced tuna... more Structure, luminescence property, and mechanism investigation of a valence-variation-induced tunable white-light emission of a novel stannate phosphor with robust thermal stability.

Small, 2021

Defects are considered to be one of the most significant factors that compromise the power conver... more Defects are considered to be one of the most significant factors that compromise the power conversion efficiencies and long-term stability of perovskite solar cells. Therefore, it is urgent to have a profound understanding of their formation and influence mechanism, so as to take corresponding measures to suppress or even completely eliminate their adverse effects on device performance. Herein, the possible origins of the defects in metal halide perovskite films and their impacts on the device performance are analyzed, and then various methods to reduce defect density are introduced in detail. Starting from the internal and interfacial aspects of the metal halide perovskite films, several ways to improve device performance and long-term stability including additive engineering, surface passivation, and other physical treatments (annealing engineering), etc., are further elaborated. Finally, the further understanding of defects and the development trend of passivation strategies are prospected.

Journal of Environmental Management, 2022

Biodegradation of pyridine starts with two mono-oxygenation reactions, and 2-hydroxyl pyridine (2... more Biodegradation of pyridine starts with two mono-oxygenation reactions, and 2-hydroxyl pyridine (2-HP) accumulates as pyridine is mono-oxygenated in the first reaction. The accumulation of 2-HP inhibits both initial reactions. Therefore, selective acceleration of the second mono-oxygenation reaction should significantly enhance pyridine transformation and mineralization. Activated-sludge biomass was separately acclimated with pyridine or 2-HP to produce pyridine- and 2-HP-acclimated biomasses. The pyridine-acclimated biomass was superior for pyridine biodegradation, but the 2-HP-acclimated biomass was superior for 2-HP biodegradation. As a consequence, the pyridine-acclimated biomass by itself achieved faster mono-oxygenation of pyridine to 2-HP, but 2-HP accumulated, which limited mineralization to 60%. In contrast, mineralization reached 90% when one-third of the pyridine-acclimated was replaced with 2-HP-acclimated biomass, because 2-HP did not accumulate during pyridine biodegradation. The lack of 2-HP accumulation relieved its inhibition: e.g., the pyridine removal rates, normalized to the mass of pyridine-acclimated biomass, increased from 0.52 to 0.57 mM0.5⋅h-1 when one-third of the pyridine-acclimated biomass was replaced by 2-HP-acclimated biomass. Phylogenetic analysis showed that microbiological communities of pyridine-acclimated biomass and 2-HP-acclimated biomass differed in important ways. On the one hand, the 2-HP-acclimated biomass was richer and dominated by a rare biosphere, or genera having <0.1% of total reads. On the other hand, the most-enriched genus in the pyridine-acclimated community (Methylibium) is associated with the first mono-oxygenation of pyridine, while enriched genera in the 2-HP-acclimated community (Sediminibacterium and Dokdonella) are associated with the second mono-oxygenation of pyridine.

GPS Solutions, 2021

Reanalysis products have been applied to calculate the tropospheric delay for Global Navigation S... more Reanalysis products have been applied to calculate the tropospheric delay for Global Navigation Satellite System (GNSS) positioning purposes widely. It is necessary to obtain high-precision tropospheric delay information from GNSS users with a high-precision tropospheric vertical stratification model because the height of the grids of the atmospheric reanalysis data is inconsistent with that of GNSS users, especially in regions with high terrains. In addition, the variation of the tropospheric delay in the vertical direction is much higher than that in the horizontal direction. The zenith total delay (ZTD) vertical stratification model is also key to the development of real-time and high-precision ZTD models. A new approach, the sliding window algorithm, is proposed to develop a ZTD vertical stratification model. In this work, a ZTD vertical stratification model considering spatiotemporal factors is developed based on the second Modern-Era Retrospective analysis for Research and Applications (MERRA-2) data, which is named the GZTD-H model. Radiosonde and International GNSS Service (IGS) data are treated as reference values to evaluate the performance of the GZTD-H model, which is compared to the model GPT2w. The results show that the GZTD-H model realizes the highest performance in ZTD layered vertical interpolation against ZTD layered profiles obtained at radiosonde sites, which achieves an improvement of 10% over the model GPT2w. Compared to model GPT2w, the GZTD-H model attains a spatial interpolation improvement of 8% for the Global Geodetic Observing System (GGOS) Atmosphere gridded ZTD over the surface ZTD calculated from radiosonde profiles. Furthermore, compared to model GPT2w, the model GZTD-H also attains improvements of 11% over the precise ZTD products acquired at IGS sites. In terms of model parameters, the GZTD-H model is greatly reduced and optimized over model GPT2w. Hence, the applicability of this model is enhanced in terms of GNSS atmospheric sounding and precise GNSS positioning.

The Journal of the Acoustical Society of America, 2018

It is common to increase the number of measurement points to improve the robustness of multipoint... more It is common to increase the number of measurement points to improve the robustness of multipoint room equalization. However, the measurement of numerous points is extremely time-consuming and laborious. This letter analyzes the early reflections extracted from a large amount of room impulse responses using a K-means clustering algorithm, revealing that the spatial distribution of early reflections in the same cluster is not disorganized but regular and predictable. Furthermore, the results of the Monte Carlo simulation suggest that the appropriate selection of measurement positions can reduce the number of measurement points without compromising the robustness of multipoint room equalization.

Remote Sensing, 2021

Pressure, water vapor pressure, temperature, and weighted mean temperature (Tm) are tropospheric ... more Pressure, water vapor pressure, temperature, and weighted mean temperature (Tm) are tropospheric parameters that play an important role in high-precision global navigation satellite system navigation (GNSS). As accurate tropospheric parameters are obligatory in GNSS navigation and GNSS water vapor detection, high-precision modeling of tropospheric parameters has gained widespread attention in recent years. A new approach is introduced to develop an empirical tropospheric delay model named the China Tropospheric (CTrop) model, providing meteorological parameters based on the sliding window algorithm. The radiosonde data in 2017 are treated as reference values to validate the performance of the CTrop model, which is compared to the canonical Global Pressure and Temperature 3 (GPT3) model. The accuracy of the CTrop model in regards to pressure, water vapor pressure, temperature, and weighted mean temperature are 5.51 hPa, 2.60 hPa, 3.09 K, and 3.35 K, respectively, achieving an improve...

Journal of Alloys and Compounds, 2021

Abstract An understanding on the site preference of luminescence centers in phosphors serves as a... more Abstract An understanding on the site preference of luminescence centers in phosphors serves as a starting point to illustrate the relationship between structure and luminescence. Till now, various methods such as theoretical calculation or modern testing techniques are employed to analyze their luminescent behavior and intrinsic mechanism. The present study proposes a local structure modification method to confirm the site occupation of Eu2+ ions in a whitlockite-type phosphor Sr18Mg3(PO4)14: Eu2+. The result shows that Eu2+ ions can not only occupy Sr2+ sites but also substitute partial Mg2+ sites in Sr18Mg3(PO4)14. Owing to this, three emission bands centered at 420 (blue), 520 (green) and 620 nm (red) are simultaneously observed upon ultraviolet light excitation, resulting in a full color emission in Sr18Mg3(PO4)14: Eu2+ phosphors. Meanwhile, the detailed structure information of Sr18Mg3(PO4)14 are renewedly evaluated and the optical spectroscopy property, decay curves and thermal quenching behavior as well as related mechanism of Sr18Mg3(PO4)14: Eu2+ are studied in detail. Finally, an ultraviolet light pumped white LED is fabricated with suitable CCT of 4663 K and high Ra of 82. The current analysis provides a deep insight into the origin of Eu2+ luminescence and its relationship with local lattice environment, which paves a new avenue to identify the site preference of luminescence centers.

Journal of Cleaner Production, 2020

Influence of mining activities on groundwater hydrochemistry and heavy metal migration using a se... more Influence of mining activities on groundwater hydrochemistry and heavy metal migration using a self-organizing map (SOM), (2020),

Journal of Clinical Pharmacy and Therapeutics, 2021

Ankylosing spondylitis (AS) and psoriatic arthritis (PsA) are chronic inflammatory rheumatic dise... more Ankylosing spondylitis (AS) and psoriatic arthritis (PsA) are chronic inflammatory rheumatic diseases that have an insidiously progressive and debilitating effect on the axial skeleton and share the same clinical and radiographic features, which have a strong overlap correlation with the HLA-B27 gene. 1 AS usually starts before age 40 with male predominance. 2 Patients may present with low back pain, spinal stiffness, hip, knee or ankle pain. As the disease progresses, the patient may develop a hunchback. Reduced mobility and axial deformity affect daily life and work. 2 PsA was recognized as another key member of the spondyloarthropathies (SpA). It occurs in up to 30% of people with psoriasis and can have severe impacts on peripheral joints, spine, tendon insertions and fingers. 3 Predominantly, axial psoriatic arthritis is usually regarded as a late stage in the PsA disease course. The cardinal manifestation is inflammatory back pain, limited motion and tenderness around the sacroiliac joints. 4 However, AS patients appear to have more back pain and limitation of spinal mobility 5,6 due to the pathological changes in the hip joint and continuous changes in the spine compared with PsA.

Journal of Energy Chemistry, 2021

Recently, perovskite solar cells (PSCs) have flourished, and their power conversion efficiency (P... more Recently, perovskite solar cells (PSCs) have flourished, and their power conversion efficiency (PCE) has increased from the initial 3.8% to 25.2% in 2019, which is an unprecedented advance. However, usually high-efficiency and stable PSCs are small-area devices prepared by spin coating. This method is not suitable for the preparation of large-area devices in commercialization. Therefore, there is an urgent need to develop new materials and methods for the scalable fabrication of PSCs. In this review, we first describe the common small-area PSCs preparation methods, understand the nucleation and crystal growth kinetics of perovskite, and analyze the reasons that hinder the development of small-area devices to large-area devices. Next, in order to meet the challenges of PSC's scalable fabrication, we summarize and analyze four strategies: scaling up precursor solutions, scalable deposition methods for large-area films, scaling up charge-transport layers and back electrodes, developing solar modules. Finally, challenges and prospects are proposed to help researchers prepare high-efficiency large-area PSCs.

Science of The Total Environment, 2021

Para-nitrophenol (PNP) is often detected in industrial wastewater that is discharged into municip... more Para-nitrophenol (PNP) is often detected in industrial wastewater that is discharged into municipal wastewater treatment plants. Intermittent discharge of PNP into municipal treatment facilities puts their biological process at risk of inhibition, and the risk is especially great for nitrification. In this work, nitrifying biomass was acclimated to PNP. The acclimated biomass retained most of its ammonium-removal activity when it was exposed to PNP at up to 100 mg/L, while the normal (unacclimated) biomass had nearly complete inhibition. PNP was effectively biodegraded by the acclimated biomass, but the normal biomass had minimal PNP biodegradation. After PNP disappeared, the acclimated biomass recovered its ability for NH4+-N removals within one to two days, but the normal biomass did not fully recovery even after seven days. The acclimated biomass had superior ability to sustain nitrification due to its ability to biodegrade PNP and its selection of nitrifying bacteria more resistant to PNP. The PNP-acclimated community was enriched in genera that could have been active in the biodegradation of PNP, such as Chloroflexi. Although the abundance of well-known nitrifiers, Nitrosomonas and Nitrospira, decreased, Nitrosospira and other genera within the Proetobacteria phylum increased, presumably because they were more resistant to PNP.