16 results on '"Xiaoyin Liu"'
Search Results
2. Hyaluronan-based hydrogel integrating exosomes for traumatic brain injury repair by promoting angiogenesis and neurogenesis
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Xiaoyin Liu, Chengheng Wu, Yusheng Zhang, Suping Chen, Jie Ding, Zhihong Chen, Kai Wu, Xiaoyang Wu, Ting Zhou, Mingze Zeng, Dan Wei, Jing Sun, Hongsong Fan, and Liangxue Zhou
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Polymers and Plastics ,Organic Chemistry ,Materials Chemistry - Published
- 2023
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Catalog
3. Tissue-like electrophysiological electrode interface construction by multiple crosslinked polysaccharide-based hydrogel
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Zhihong, Chen, Xiaoyin, Liu, Jie, Ding, Yuan, Tian, Yusheng, Zhang, Dan, Wei, Jing, Sun, Fang, Luo, Liangxue, Zhou, and Hongsong, Fan
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Silver ,Polymers and Plastics ,Nanowires ,Polysaccharides ,Organic Chemistry ,Materials Chemistry ,Humans ,Hydrogels ,Electrodes - Abstract
A reliable electrophysiological electrode interface (EEI) between bioelectronic devices and biological tissues is indispensable to achieve the high fidelity recording of bioelectricity. However, there is an inherent tradeoff among EEI's electrochemical characteristics, mechanical properties and biocompatibility when considering the desired nanostructure and optimum composition. Here, we proposed a mechanically matched, highly conductive and biocompatible EEI, a tissue-like metal-doped hydrogel which could enable excellent electro-biosensing, by bringing disulfide modified silver nanowires into difunctional hyaluronan/carboxymethyl chitosan composite. The intensity of cortical signals at specific frequency domain recorded by the hydrogel-based EEI is doubled, which is significant for the diagnosis of epilepsy. Furthermore, the natural gel matrix could lead to seamless bio-integration between EEI and the tissue site of interest, minimizing signal dissipation without causing obvious inflammatory response. Overall, the EEI we designed contributes to improving tissue-device integration as well as bioelectronic device's performance and further leads to more effective human-computer interfaces. more...
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- 2022
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4. Win-win for monosodium glutamate industry and paddy agriculture: Replacing chemical nitrogen with liquid organic fertilizer from wastewater mitigates reactive nitrogen losses while sustaining yields
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Yawei Li, Junzeng Xu, Xiaoyin Liu, Boyi Liu, Weixuan Liu, Xiyun Jiao, and Jiaoyan zhou
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Renewable Energy, Sustainability and the Environment ,Strategy and Management ,Building and Construction ,Industrial and Manufacturing Engineering ,General Environmental Science - Published
- 2022
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5. Aldehyde-methacrylate-hyaluronan profited hydrogel system integrating aligned and viscoelastic cues for neurogenesis
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Suping, Chen, Chengheng, Wu, Ting, Zhou, Kai, Wu, Nini, Xin, Xiaoyin, Liu, Zi, Qiao, Dan, Wei, Jing, Sun, Hongrong, Luo, Liangxue, Zhou, and Hongsong, Fan
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Aldehydes ,Tissue Engineering ,Tissue Scaffolds ,Polymers and Plastics ,Viscosity ,Neurogenesis ,Organic Chemistry ,Materials Chemistry ,Methacrylates ,Hydrogels ,Hyaluronic Acid - Abstract
Either oriented architecture or viscoelasticity is pivotal to neurogenesis, thus, native neural extracellular matrix derived-hyaluronan hydrogels with nano-orientation and viscoelasticity recapitulated might be instructive for neurogenesis, however it is still unexploited. Herein, based on aldehyde-methacrylate difunctionalized hyaluronan, by integrating imine kinetic modulation and microfluidic biofabrication, we construct a hydrogel system with orthogonal viscoelasticity and nano-topography. We then find the positive synergy effects of matrix nano-orientation and viscoelasticity not only on neurites outgrowth and elongation of neural cells, but also on neuronal differentiation of stem cells. Moreover, by implanting viscoelastic and nano-aligned hydrogels into lesion sites, we demonstrate the enhanced repair of spinal cord injury, including ameliorated pathological microenvironment, facilitated endogenous neurogenesis and functional axons regeneration as well as motor function restoration. This work supplies universal platform for preparing neuronal inducing hyaluronan-based hydrogels which might serve as promising therapeutic strategies for nerve injury. more...
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- 2022
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6. Inter-seasonal and cross-treatment variability in single-crop coefficients for rice evapotranspiration estimation and their validation under drying-wetting cycle conditions
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Shihong Yang, Xiaoyin Liu, Junzeng Xu, Yuping Lv, Yijiang Wang, and Jiangang Zhang
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Hydrology ,Irrigation ,0208 environmental biotechnology ,Soil Science ,04 agricultural and veterinary sciences ,02 engineering and technology ,Subtropics ,Atmospheric sciences ,Monsoon ,Cross-validation ,020801 environmental engineering ,Crop ,Crop coefficient ,Evapotranspiration ,Lysimeter ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental science ,Agronomy and Crop Science ,Earth-Surface Processes ,Water Science and Technology - Abstract
A two-year experiment was conducted to investigate the inter-seasonal and cross-treatment variability in measured rice evapotranspiration (ETcMea), measured single-crop coefficients (KcMea), and treatment-specific calibrated coefficients (KcCal), under different drying-wetting cycles in a subtropical monsoon climate in East China. For each drying-wetting treatment, ETcMea was determined based on data collected in lysimeters, and KcMea was calculated from ETcMea, reference evapotranspiration, and soil moisture deficit coefficient. Following the single-crop coefficient method, KcCal was determined by matching KcMea. In 2012 and 2013, ETcMea varied from 459.5 to 486.7 mm, and 544.5–605.1 mm, respectively. Its inter-seasonal variability was larger than the cross-treatment variability. Stage-wise average KcMea were 1.07–1.17, 1.30–1.51, 1.49–1.54, and 1.17-1.29 in 2012, and 1.06–1.12, 1.31–1.49, 1.43–1.57, and 1.26–1.27 in 2013 during the initial, crop development, mid-season, and late season stages, respectively. Treatment-specific KcCal were calibrated as 1.09–1.20, 1.51–1.60, and 0.74–0.78 in 2012, and 1.05–1.14, 1.47–1.64, and 0.96–1.01 in 2013 for the initial, mid-season, and end-season stages, respectively. The inter-seasonal and cross-treatment variability in KcMea and KcCal was low. Each treatment-specific KcCal set performed similarly when rice ETc was calculated under different drying-wetting treatments. Cross validation indicated that large daily uncertainty in ETc estimation occurred when daily ETcMea was high, and uncertainty in seasonal ETc calculated using different treatment-specific KcCal sets ranged from 45.7 to 60.1 mm (approximate to one irrigation). Calibrating KcCal using more data (season-specific KcCal or mixed treatment KcCal) would improve the accuracy of KcCal in ETc estimation. more...
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- 2018
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7. Modeling rice evapotranspiration under water-saving irrigation by calibrating canopy resistance model parameters in the Penman-Monteith equation
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Junzeng Xu, Xiaoyin Liu, Shihong Yang, Zhiming Qi, and Yijiang Wang
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Hydrology ,Canopy ,Coefficient of determination ,010504 meteorology & atmospheric sciences ,0208 environmental biotechnology ,Eddy covariance ,Soil Science ,02 engineering and technology ,Atmospheric sciences ,01 natural sciences ,020801 environmental engineering ,Field capacity ,Evapotranspiration ,Environmental science ,Leaf area index ,Penman–Monteith equation ,Agronomy and Crop Science ,Water content ,0105 earth and related environmental sciences ,Earth-Surface Processes ,Water Science and Technology - Abstract
A canopy-resistance-based Penman-Monteith (PM) model’s performance in estimating rice evapotranspiration (ET) under water-saving irrigation (WSI) condition at hourly and daily intervals was evaluated. To improve the performance of Jarvis-type canopy-resistance model in calculating rice ET under water-saving irrigation condition with Penman-Monteith (PM) model, a term of effective leaf area index was used to reflect the influence of canopy coverage condition, and field capacity was replace by saturated soil moisture (θs) in soil water response functions due to the specific field moisture condition in WSI rice fields. Two years of hourly rice ET measured using eddy covariance (EThEC) with energy balance closure adjustment served to calibrate (2014 data) and validate (2015 data) a canopy-resistance-based PM model. Results indicate that the PM model’s output (EThsim) with calibrated canopy resistance model parameters closely matched measured EThEC, with a regression slope, intercept, coefficient of determination (R2), root mean squared error (RMSE) and index of agreement (IOA) of 1.001, 0.010 mm h−1, 0.942, 0.057 mm h−1 and 0.985, respectively for validation data set in 2015, better than the results calculated by model with parameters calibrated for general paddy field. The improved PM model performed well not only in a dense canopy condition (LAI > 3) but also for a sparse canopy (LAI more...
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- 2017
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8. Improving the performance in crop water deficit diagnosis with canopy temperature spatial distribution information measured by thermal imaging
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Shimeng Liu, Yajun Luan, Haiyu Wang, Yuping Lv, Xiaoyin Liu, and Junzeng Xu
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Canopy ,Irrigation ,Coefficient of determination ,0208 environmental biotechnology ,Soil Science ,Soil science ,04 agricultural and veterinary sciences ,02 engineering and technology ,Spatial distribution ,020801 environmental engineering ,Anthesis ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental science ,Agronomy and Crop Science ,Water content ,Earth-Surface Processes ,Water Science and Technology ,Transpiration ,Quantile - Abstract
Infrared thermal imaging cameras are effective tools to monitor the spatial distribution of canopy temperature (Tc), which is the basis of the crop water stress index (CWSI) calculation. This paper presents a new method to improve the CWSI performance in crop water stress diagnosis based on Tc measured by thermal imaging. Cumulative frequency curves of pixel Tc extracted from each thermal image were analysed. Different statistical quantiles of Tc were determined, and the average Tc over different statistics quantiles were used to calculate the CWSI separately. There were large gaps among the CWSI based on Tc over different statistical quantiles. We compared the coefficient of determination (R2) of relationships among the CWSI based on Tc over different statistical quantiles and relative leaf photosynthetic activities. The general sensitive CWSI showed the best correlations with leaf photosynthetic activities, which were calculated based on average values of the top 60%, 50%, 70%, 50% of Tc statistics at different growth stages. The ranges of the CWSI with optimal leaf water use efficiency (between turning-points for downward trends in photosynthesis and transpiration) were 0.556–0.569, 0.481–0.486, 0.571–0.641, and 0.511–0.606 at tillering, panicle initiation to booting, heading to anthesis, and milk to soft dough stages respectively. The corresponding soil moisture levels were consistent with the lower thresholds of the rice under control irrigation. Based on the spatial distribution of canopy temperatures measured by thermal imaging cameras, the general sensitive CWSI, which was calculated by removing low temperatures, had a better performance in crop water stress diagnosis. more...
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- 2021
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9. Preliminary Analysis of Clinical Situations Involved in Quantification of Contrast-Enhanced Ultrasound in Crohn's Disease
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Chuan Yang, Min Zhi, Yao Chen, Weili Wang, Junli Yu, Jian Tang, Guang-Jian Liu, Yanling Wen, Pinjin Hu, Wenjie Cheng, Xiang Gao, and Xiaoyin Liu
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Adult ,Male ,medicine.medical_specialty ,Adolescent ,Acoustics and Ultrasonics ,Biophysics ,Anterior wall ,Contrast Media ,030218 nuclear medicine & medical imaging ,Preliminary analysis ,Young Adult ,03 medical and health sciences ,0302 clinical medicine ,Ultrasound probe ,Crohn Disease ,Region of interest ,Peak intensity ,Humans ,Medicine ,Radiology, Nuclear Medicine and imaging ,Aged ,Retrospective Studies ,Ultrasonography ,Crohn's disease ,Radiological and Ultrasound Technology ,business.industry ,Ultrasound ,Middle Aged ,Image Enhancement ,medicine.disease ,Gastrointestinal Tract ,Female ,030211 gastroenterology & hepatology ,Radiology ,business ,Contrast-enhanced ultrasound - Abstract
To assess influencing factors for quantitative analysis of contrast-enhanced ultrasound (CEUS) in Crohn's disease (CD), dynamic CEUS examinations from 77 consecutive CD patients were recorded. Peak intensity (PI) values were calculated using the pre-installed quantification software of the ultrasound scanner. The influence of depth, pressure from the ultrasound probe and intraluminal gas was analyzed. The PI value of the anterior wall was lower than that of the posterior wall when the depth was ≤3.4 cm (17.9 dB vs. 21.3 dB; p 0.05) or evident pressure was exerted (19.1 dB vs. 22.5 dB; p 0.01). In the presence of intraluminal gas, the PI of the anterior wall was higher than that of the posterior wall (20.7 dB vs. 18.8 dB; p 0.05). Nevertheless, no significant difference was found between the PI value of anterior and posterior walls when the depth was3.4 cm (19.8 dB vs. 20.3 dB), moderate pressure was exerted (20.5 dB vs. 21.1 dB) or luminal gas was excluded between the two bowel walls (18.9 dB vs. 21.2 dB; p ≥ 0.05). The factors of depth, pressure from the ultrasound probe and intraluminal gas can affect the quantification results of CEUS. It is preferable to place the region of interest in the posterior wall when luminal gas is absent and in the anterior wall when luminal gas is present. In the latter case, more attention should be paid to reducing pressure by the ultrasound probe. more...
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- 2016
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10. Variations of carbon dioxide exchange in paddy field ecosystem under water-saving irrigation in Southeast China
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Junzeng Xu, Yijiang Wang, Xiaoyin Liu, Jiangang Zhang, and Shihong Yang
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Hydrology ,Irrigation ,010504 meteorology & atmospheric sciences ,Diurnal temperature variation ,Eddy covariance ,Soil Science ,04 agricultural and veterinary sciences ,Seasonality ,medicine.disease ,01 natural sciences ,chemistry.chemical_compound ,chemistry ,Carbon dioxide ,040103 agronomy & agriculture ,medicine ,0401 agriculture, forestry, and fisheries ,Paddy field ,Environmental science ,Ecosystem ,Ecosystem respiration ,Agronomy and Crop Science ,0105 earth and related environmental sciences ,Earth-Surface Processes ,Water Science and Technology - Abstract
Based on the results of continuous flux measurements in the Taihu Lake Region of China, the carbon dioxide (CO2) exchange of paddy fields under water-saving irrigation and its influence factors were analyzed. The net ecosystem exchange of CO2 (NEE) were negative during the daytime and positive at night, and the minimum value appeared around noon. The peak CO2 uptake in the flourishing period was approximately 1.5 times the values observed in the tillering and ripening stages. Frequent alternation of wetting and drying in paddy fields with water-saving irrigation resulted in larger NEE for the typical day before soil rewatering than that for the day after soil rewatering in the early growth stage. These alterations had a minimal effect on diurnal variation of NEE in the late rice growth stage. The average NEE for the typical days after soil rewatering in July and August were 2.30 and 1.38 times that before soil rewatering, respectively. CO2 exchange in paddy field ecosystem under water-saving irrigation displayed seasonal variation with the change of rice plant growth. The total ecosystem respiration (Reco), NEE and gross primary productivity (GPP) were 1996.88, −1284.15 and 3281.03 g m−2, respectively, throughout the growth stage. These results showed that the paddy field ecosystem under water-saving irrigation was a sink for atmospheric CO2. Frequent alternation of wetting and drying processes increased the ecosystem reparation of paddy fields under water-saving irrigation and produced smaller net CO2 absorption compared to that of flooding irrigation. The net CO2 absorption because of plant photosynthesis during the daytime and the net CO2 release at night measured by static transparent chamber method were larger than those measured by eddy covariance method (P more...
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- 2016
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11. Modeling rice evapotranspiration under water-saving irrigation condition: Improved canopy-resistance-based
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Yawei Li, Weiguang Wang, Yuping Lv, Xiaoyin Liu, and Junzeng Xu
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Canopy ,Irrigation ,010504 meteorology & atmospheric sciences ,0207 environmental engineering ,Soil science ,02 engineering and technology ,01 natural sciences ,Field capacity ,Evapotranspiration ,Soil water ,Environmental science ,Leaf area index ,Water cycle ,020701 environmental engineering ,Water content ,0105 earth and related environmental sciences ,Water Science and Technology - Abstract
Models capable of accurately calculating crop evapotranspiration (ET) are essential to improving water management at both the hydrological cycle and the agriculture irrigation project scale. Penman-Monteith (PM) and Shuttleworth-Wallace (SW) models based on the Jarvis-type canopy resistance (rc) model were used to calculate the hourly and daily ET of rice grown in East China under water-saving irrigation (WSI). The model parameters in rc and soil resistance ( r s s ) were recalibrated to improve the accuracy of rice ET estimations. Notable, three improvements were made to the rc model: (i) model parameters were calibrated at the canopy scale, and a term of effective leaf area index was used to reflect the influence of canopy coverage; (ii) the coefficient a4 was used to reflect the influence of the specific soil moisture patterns under WSI practice; and (iii) for rice crops, soil moisture at saturation, rather than at field capacity for upland crops, served as a key parameter in the soil water response functions. Both PM and SW models generated similar rice ET outputs due to their common theoretical basis. Surprisingly, the PM model, with an appropriately adjusted rc value, performed better than the SW model in simulating hourly and daily rice ET under WSI practice, particularly during periods when canopy cover was either dense or sparse. Sensitivity analyses showed both models to be highly sensitive to changes in rc, and soil moisture (θ), the latter being one of the dominant contributors to variations in rc and r s s . Accordingly, the PM model is recommended for the prediction of rice ET grown under WSI conditions in East China, with the caveat that both the rc and θ should be accurately quantified when used as inputs. more...
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- 2020
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12. Effect of biochar addition on CO2 exchange in paddy fields under water-saving irrigation in Southeast China
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Shihong Yang, Xiao Sun, Zewei Jiang, Jie Ding, Xiaoyin Liu, and Junzeng Xu
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Irrigation ,Environmental Engineering ,0208 environmental biotechnology ,Carbon sink ,02 engineering and technology ,General Medicine ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,Carbon sequestration ,01 natural sciences ,020801 environmental engineering ,Soil respiration ,Agronomy ,Biochar ,Environmental science ,Paddy field ,Soil fertility ,Ecosystem respiration ,Waste Management and Disposal ,0105 earth and related environmental sciences - Abstract
Biochar has been widely applied to paddy fields to improve soil fertility, crop productivity and carbon sequestration, thereby leading to variations in the CO2 exchange between the paddy fields under flooding irrigation and the atmosphere, as indicated by many previous reports. However, few relevant reports have focused on paddy fields under water-saving irrigation. This study conducted a field experiment to investigate the effects of three biochar addition rates (0, 20 and 40 t ha-1) on the CO2 exchange between paddy fields under controlled irrigation (CI, a water-saving irrigation technique) and the atmosphere in the Taihu Lake region of Southeast China. Our results showed that biochar addition increased the paddy field ecosystem respiration (Reco) and the soil respiration rate (Rs) in the CI paddy fields. And biochar application increased the total CO2 emissions and the total soil CO2 emissions, especially at a rate of 40 t ha-1. In contrast, gross primary productivity (GPP) was decreased and the net ecosystem exchange of CO2 (NEE) was increased with biochar addition. However, biochar addition at a rate of 20 t ha-1 significantly increased the total CO2 absorption and the net CO2 absorption of the CI paddy fields (p more...
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- 2020
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13. Salinity-induced concomitant increases in soil ammonia volatilization and nitrous oxide emission
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Zhe Gu, Yawei Li, Qi Wei, Haiyu Wang, Junzeng Xu, Fazli Hameed, Xiaoyin Liu, Shimeng Liu, and Zhiming Qi
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inorganic chemicals ,Soil salinity ,Reactive nitrogen ,Soil Science ,04 agricultural and veterinary sciences ,Nitrous oxide ,010501 environmental sciences ,Ammonia volatilization from urea ,complex mixtures ,01 natural sciences ,Salinity ,chemistry.chemical_compound ,Ammonia ,chemistry ,Environmental chemistry ,040103 agronomy & agriculture ,Urea ,0401 agriculture, forestry, and fisheries ,Ammonium ,0105 earth and related environmental sciences - Abstract
Environmental concerns about the release of reactive nitrogen (N) from intensively fertilized farmland are growing, especially regarding gaseous N losses in the form of ammonia (NH3) and nitrous oxide (N2O). While saline soils are widely distributed and gradually expanding worldwide, the effect of soil salinity on soil NH3 and N2O emissions is poorly understood. To assess the effect of soil salinity levels on NH3 volatilization and N2O emissions, a field experiment was conducted with three soil salinity levels (S0 = non-saline, S1 = 1.0 dS m−1 and S2 = 5.0 dS m−1) and two N fertilizer types (urea and ammonium sulphate). Compared to the non-saline soil, S1 and S2 salinity levels both led to significant increases in cumulative NH3 volatilization losses by 40.0%–65.2% and 89.0%–92.2%, respectively (p more...
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- 2020
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14. A novel model of water-heat coupling for water-saving irrigated rice fields based on water and energy balance: Model formulation and verification
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Junzeng Xu, Yawei Li, Weiguang Wang, Xiaoyin Liu, and Boyi Liu
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Canopy ,Irrigation ,0208 environmental biotechnology ,Energy balance ,Soil Science ,Soil science ,04 agricultural and veterinary sciences ,02 engineering and technology ,020801 environmental engineering ,Water scarcity ,Water balance ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental science ,Paddy field ,Water-use efficiency ,Agronomy and Crop Science ,Water content ,Earth-Surface Processes ,Water Science and Technology - Abstract
It is necessary to quantify the hydrothermal processes by develop a water-heat coupling model in rice fields where the transfer between water and energy is dramatically violent, under the circumstance that water-saving irrigation (WSI) was widely used in rice paddy due to the increasing water scarcity. Based on the theory of energy and water balance, considering the interaction of impedance near the ground, a simplified holistic recursive model of water-heat coupling was proposed in the soil–plant–atmosphere continuum (SPAC) system at hourly and daily scales, and the parameters were fitted based on water and energy balance components measured in WSI rice fields. The model, takes various soil moisture conditions into consideration, integrates all the terms in the surface energy balance and the water balance with conventional meteorological data as inputs. Additionally, the model accounts for the specific drying-wetting cycles condition for WSI rice field in the calculation of the canopy resistance (rc) and the recursive process. Variations in crop growth and meteorology were also considered. The results showed that the model performed well in simulating the water and heat fluxes, and temperature profiles during the growth of the rice. This is encouraging for modelling the response of hydrothermal process to drying-wetting cycles or irrigation regimes, which is help for improving the water use efficiency in rice field. Meanwhile, this study indicates that the systemic model is efficient and useful for a better understanding the interaction between hydrological and energy processes in the WSI rice ecosystem. more...
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- 2019
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15. Fabrication of carbon nanotubes/poly(1,2-diaminobenzene) nanoporous composite via multipulse chronoamperometric electropolymerization process and its electrocatalytic property toward oxidation of NADH
- Author
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Xiurong Zhai, Kai Liu, Wanzhi Wei, Ling Wu, Xiaoyin Liu, Jinxiang Zeng, Jian Yin, Xiaohua Gao, and Shuguo Gong
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Detection limit ,Materials science ,Nanoporous ,Composite number ,Metals and Alloys ,Analytical chemistry ,Carbon nanotube ,Condensed Matter Physics ,Electrochemistry ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,law.invention ,Linear range ,Chemical engineering ,law ,Electrode ,Materials Chemistry ,Electrical and Electronic Engineering ,Cyclic voltammetry ,Instrumentation - Abstract
A novel method was proposed for fabrication of a carbon nanotubes/poly(1,2-diaminobenzene) nanoporous composite based electrode. The poly(1,2-diaminobenzene) was deposited onto the surface of a glassy carbon electrode (GCE) modified with multi-wall carbon nanotubes (MWNTs) via multipulse chronoamperometric electropolymerization (MCE) process. Compared with the composite prepared by conventional electropolymerization (CE), the electronic and ionic transport capacity of the MCE-based composite were significantly improved due to its unique nanoporous structure. The surface of the composite-modified GCE was characterized with scanning electron microscopy (SEM) and cyclic voltammetry (CV). The nanoporous MCE-based electrode was applied to determination of NADH at a much low potential of 70 mV, and a linear range from 2.0 μM to 4.0 mM was observed with fast response (within 5 s) and a lower detection limit of 0.5 μM (based on S/N = 3). In comparison, a narrow linear range from 5.0 μM to 2.0 mM, slower response (up to 15 s) and a higher detection limit of 3.0 μM (based on S/N = 3) was obtained with the electrode prepared by CE. The wider linear range, lower detection limit and fast response of the MCE-based electrode implies that the new method proposed can provide more excellent platforms for sensitive electrochemical sensing and biosensing. more...
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- 2007
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16. Fabrication of poly(toluidine blue O)/carbon nanotube composite nanowires and its stable low-potential detection of NADH
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Kai Liu, Xiaoyin Liu, Wanzhi Wei, Yi Li, Ling Wu, and Jinxiang Zeng
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Chemistry ,General Chemical Engineering ,Composite number ,Nanowire ,Nanotechnology ,Carbon nanotube ,Overpotential ,Electrochemistry ,Analytical Chemistry ,Dielectric spectroscopy ,law.invention ,Chemical engineering ,law ,Electrode ,Cyclic voltammetry - Abstract
A new type of poly(toluidine blue O)/multiwall carbon nanotube (PTBO/MWNTs) composite nanowires was fabricated by two steps: first, the TBO monomer was assembled onto multiwall carbon nanotubes (MWNTs) to form TBO/MWNTs adduct. Then, the obtained TBO/MWNTs adduct was electropolymerized on a glassy carbon electrode (GCE) surface by cyclic voltammetry. The nanowires modified GCE was characterized with scanning electron microscopy (SEM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The PTBO/MWNTs composite nanowires modified electrode was applied to determinate NADH. Compared with bare GCE and MWNTs modified GCE, the PTBO/MWNTs composite nanowires modified GCE decreased the NADH oxidization overpotential by about 650 mV and 260 mV, respectively, with a much low peak potential at about 0.0 V (vs. SCE). The peak current response at PTBO/MWNTs composite nanowires modified GCE was about 4.5 times higher than that of ultrathin PTBO modified GCE, at the same peak potential. A linear range from 2.0 μM to 4.5 mM was observed with fast response (within 5 s) and a low detection limit of 0.5 μM (based on S / N = 3). The current diminution to 1.0 mM NADH is lower than 10% in a period over 70 min shows that the PTBO/MWNTs composite nanowires modified GCE is quite stable. The better electrocatalytic behavior toward NADH oxidation at PTBO/MWNTs composite nanowires modified GCE suggests that the composite nanowires is an excellent platform for electrochemical sensing and biosensing. more...
- Published
- 2006
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