JOURNAL OF THE ENERGY INSTITUTE
·
2018
·
IF 4.217
Shuai-wei Liu,Rui-tang Guo,Xiao Sun,Jian Liu,Wei-guo Pan,Zhi-ling Xin,Xu Shi,Zhong-yi Wang,Xing-yu Liu,Hao Qin
In present study, the poisoning mechanism of Cl on V/TiO 2 catalyst for SCR removal of NOx using NH 3 as the reductant was explored by in situ DRIFT technique. The experimental results revealed that the existence of Cl did not change the SCR reaction mechanism over V/TiO 2 catalyst, which was mainly under the control of both E-R and L-H mechanisms. The deactivation of V/TiO 2 catalyst by Cl was mainly resulted from the inhibited adsorption of NH 3 and NOx species, accompanied by the decrease of the reactivity of adsorbed NH 3 species.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
NATURE MATERIALS
·
2024
·
IF 37.2
He Yunfeng,Cheng Yu,Yang Canhui,Guo Chuan Fei
Artificial pressure sensors often use soft materials to achieve skin-like softness, but the viscoelastic creep of soft materials and the ion leakage, specifically for ionic conductors, cause signal drift and inaccurate measurement. Here we report drift-free iontronic sensing by designing and copolymerizing a leakage-free and creep-free polyelectrolyte elastomer containing two types of segments: charged segments having fixed cations to prevent ion leakage and neutral slippery segments with a high crosslink density for low creep. We show that an iontronic sensor using the polyelectrolyte elastomer barely drifts under an ultrahigh static pressure of 500 kPa (close to its Young’s modulus), exhibits a drift rate two to three orders of magnitude lower than that of the sensors adopting conventional ionic conductors and enables steady and accurate control for robotic manipulation. Such drift-free iontronic sensing represents a step towards highly accurate sensing in robotics and beyond.
研究领域:
材料科学
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机器人技术
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传感器
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聚合物化学
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产品关联
DOI
PubMed
高影响因子
Applied Sciences-Basel
·
2021
·Vol. 11
·期 16
·7258
·
IF 2.679
Qi Liu,Shengde Chen,Guobin Wang,Yubin Lan
Background: Unmanned Aerial Vehicles (UAVs) applied to agricultural plant protection is widely used, and the field of operation is expanding due to their high efficiency and pesticide application reduction. However, the work on pesticide drift lags behind the development of the UAV spraying device. Methods: We compared the spray drift potential at four liquid pressures of 2, 3, 4, and 5 bar ejected from the hydraulic nozzles mounted on a UAV test platform exposed to different wind speeds of 2, 4, and 6 m/s produced by a wind tunnel. The combination of the wind tunnel and the UAV test platform was used to obtain strict test conditions. The droplet size distribution under spray drift pressures was measured by a laser diffraction instrument. Results: Increasing the pressure leads to smaller droplet volume diameters and produced fine droplets of less than 100 µm. The deposition in the drift area was elevated at most of the sampling locations by setting higher pressure and faster wind speed. The deposition ratios were all higher than the flow ratios under three wind speeds after the adjustment of pressures. For most samples within a short drift distance (2–8 m), the drift with the rotor motor off was more than an order of magnitude higher than that with the rotor motor on at a pressure of 3 bar. Conclusions: In this study, the wind speed and liquid pressure all had a significant effect on the UAV spray drift, and the rotor wind significantly inhibited a large number of droplets from drifting further.Keywords:unmanned aerial vehicle;liquid pressure;drift deposition;wind speed;rotor wind field;droplet size
研究领域:
农业工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
WASTE MANAGEMENT & RESEARCH
·
2021
·
IF 3.549
Shaoqing Bian,Chibuike K Nduneseokwu,Changjun Li,Marie K Harder
An incentives-based residential recycling programme was designed and implemented for improving residential waste sorting in Shanghai city, but showed very limited success in its performance. To identify why, this study systematically analysed each step of implementation using key informant interviews and site observations. Results show that policy intentions were retained in the policy devolution processes from Municipality to District, and then to Street (ward) levels, but the incentives concepts were effectively nullified in the further devolution to community-level governance. The local implementers focused on formal key performance indicators (KPIs) in order to satisfy inspections. However, the KPIs, which had been devised to allow ease of measurement, were found to unintentionally cause divergence from the policy intention of incentivisation of residents. Furthermore, high scores for these KPIs masked the implementation failure. This identification of the effective derailing of a policy via conscientious implementation is worth highlighting for avoidance in other programmes, in recycling or elsewhere.
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DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 11
·
IF 12.5
Jia Song,Rusong Yang,Junli Shi,Xingxing Chen,Sai Xie,Zelong Liao,Ruijie Zou,Yupeng Feng,Terry Tao Ye,Chuan Fei Guo
The real-time monitoring of health conditions of humans is a long-lasting topic, but there are two major challenges. First, many biomedical applications accept only implanted sensors. Second, tissue-like soft sensors often suffer from viscoelasticity-induced signal drift, causing inaccurate measurements. Here, we report a wireless and drift-free sensory system enabled by a low-creep polyelectrolyte elastomer. The system consists of the iontronic pressure sensors incorporating inductance-capacitance (LC) oscillators, exhibiting combined low drift ratio, high Q factor, high robustness to interferences, and wide-range measurement, superior to other capacitive sensors using regular dielectrics or ionogels. We have recorded 14-day orthodontic loads of two subjects using the system, showing pressure decreasing from 300 to 50 kPa and torque from 12.5 to 0.5 N·mm. The wireless, drift-free sensory system may be extended to other implants for long-term and accurate sensing.
研究领域:
生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
InfoMat
·
2026
·
IF 19.6
Yinuo Wang,Senchi Li,Longwei Li,Panpan Zhang,Yang Zhang,Xiong Pu
Flexible iontronic pressure sensors with high sensitivity, low hysteresis, and low detection limit are increasingly demanded for wearable electronics and intelligent robotics. However, it remains challenging to combine these sensor performances due to inherent property trade-offs in pressure-sensitive ion-conducting elastomers (ICEs), particularly among mechanical resilience, softness, and ionic conductivity. To address this issue, we propose a load-bearing and mechanically reversible network design that integrates strong covalent crosslinks for mechanical elasticity, weak sacrificial bonds for softness, and dynamic coordination interactions to facilitate ion transport. Based on this strategy, our fabricated ICEs exhibit excellent elasticity (<5% hysteresis over 1000 tensile cycles), low elastic modulus (~66 kPa), intrinsic self-healing capability, and high ionic conductivity (2.57 × 10 −4 S cm −1 at room temperature). The resulting iontronic sensor achieves high sensitivity (8.28 kPa −1 ), low detection limit (6 Pa), and minimal signal drift (~0.72% capacitance change over 10 h.). Finally, the superiority of the low drift iontronic sensor is demonstrated by a robotic gripper with high reliability. Therefore, this work provides a general design principle to reconcile competing demands in ICEs and enables the development of high-performance, durable iontronic sensors for next-generation wearable and robotic applications.
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DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Yong Zhang,Pei Li,Xin Gou,Shipan Lang,Changrong Liao,Lin Guo,Jingming Hou,Lei Xie,Jun Yang
In biomechanical sensing, achieving flexible sensors with a broad detection range, ultrahigh sensitivity, and long-term stability remains a major challenge. Inspired by the gradient-modulus structure of human skin, we fabricated a bioinspired gradient-modulus iontronic sensor (GMIS) by integrating a microstructured ionic gel with a glass fiber-reinforced matrix. This design expanded the sensing range and stability, enabling real-time monitoring of multiple physiological signals. Experimental results demonstrated that GMIS maintained ultrahigh sensitivity (2904 kPa–1) over a wide pressure range (∼3 MPa), effectively doubling that of the uniform counterpart. Glass fiber reinforcement enhanced the matrix hydrogen bonding network, effectively reducing viscoelastic-crew-inducedviscoelastic creep-induced drift from 62.28% in the uniform counterpart to 11.8% under dynamic loading. Moreover, the sensor withstood over 3000 loading cycles at 3 MPa. Combined with a convolutional neural network algorithm, the plantar pressure sensing system achieved a Pearson correlation coefficient exceeding 0.91 between measured and predicted values during walking and running. This work establishes a modulus-gradient design strategy for wearable biomechanical sensors, integrating material innovation with biomechanical analysis for musculoskeletal rehabilitation and health monitoring.
研究领域:
生物医学工程
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可穿戴电子
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柔性机器人
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传感器与传感技术
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肌肉骨骼康复
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hongli Yang,Huilin Hou,Man Yang,Zhongli Zhu,Hui Fu,Dongdong Zhang,Yong Luo,Weiyou Yang
The selective photoreduction of CO 2 into hydrocarbon fuels, such as CH 4 , is highly desirable for sustainable energy but remains a significant challenge due to slow proton-electron transfer processes and competing intermediates. Herein, a novel NiO/MgAl-LDH (NMA-x, LDH represents layered double hydroxide) step-scheme (S-scheme) heterojunction has been engineered via in-situ anchoring MgAl-LDH nanoplates on metal–organic frameworks (MOFs) derived NiO microrods, which improves the CO 2 adsorption capability and specific surface area of NiO. The steered internal electric field in the p-n heterointerface promotes charge separation and attracts a high electron density center on the catalyst surface to favor CH 4 production. Meanwhile, S-scheme photogenerated charge transfer mechanism is proposed by in-situ X-ray photoelectron spectroscopy (XPS), in-situ diffuse reflectance infrared Fourier transform (DRIFT) spectra and density functional theory (DFT) calculation. In this process, photogenerated electrons are transferred from the conduction band (CB) of MgAl-LDH to the valence band (VB) of NiO, facilitating the CHO* species serve as the critical intermediate for producing CH 4 through desired photocatalytic CO 2 reduction. Using pure water as a proton source, the NMA-2 catalyst achieved a high CH 4 selectivity of 91.2% and a yield of 8.98 μmol∙g −1 ∙h −1 , representing significant potential for practical applications. This catalyst outperformed pristine and revitalized NiO by 4.23 and 2.07 times, respectively.
研究领域:
材料科学
·
催化
·
环境化学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
STAR Protocols
·
2026
·Vol. 7
·期 3
·104823
·
IF 1.4
Shu He,Bingxue Cao,Xinyi Zhang,Yabin Liu,Yongheng Zhang,Haowen Guo,Xingchun Zhai,Min Zhang
Summary Spatiotemporal encoding constructs drift-tolerant artificial-olfaction systems using a single sensing material. Here, we present a protocol for discriminating complex volatile organic compounds (VOCs) via this approach. We describe steps for hydrothermally synthesizing a porous CuP@G chemoresistive ink and laser-fabricating programmed micro-architectures. We then detail procedures for micro-cavity device assembly, spatiotemporal signal acquisition, and machine-learning interpretation. For complete details on the use and execution of this protocol, please refer to Zhai et al. 1
✓ 已验证
DOI
高影响因子
Device
·
2026
·
IF 8.7
Xinyu Fan,Xiaoya Ding,Min Yang,Jiatian Cheng,Qiongyao Wang,Kang Yang,Shengzhong Frank Liu,Zhou Yang
Metal halide perovskites are promising for X-ray detection. However, ion migration remains a challenge, limiting their performance. Theoretical studies indicate that ion migration can be suppressed at low temperatures due to a reduction in ion vacancy concentration. In this work, the temperature-dependent optoelectronic and X-ray detection properties of CH 3 NH 3 PbI 3 (MAPbI 3 ) have been investigated from −100°C to 20°C. Our results exhibit that ion migration is inhibited at low temperatures, accompanied by a reduction in trap density and ionic vacancies, leading to a decrease in dark current and its drift. The detector delivers a dark current drift of 12.6 fA cm −1 V −1 s −1 , an X-ray sensitivity of 3.47 × 10 4 μC Gy air −1 cm −1 , and a low detection (LoD) limit of 2.2 nGy air s −1 under −20°C. This study offers a strategy for mitigating ion migration and highlights the potential of perovskite-based X-ray detectors.
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DOI
高影响因子
TALANTA
·
2021
·
IF 6.057
Yu-Ning Hu,Jin-Tao Zhan,Quan-Fei Zhu,Ting Hu,Na An,Zhen Zhou,Yong Liang,Wei Wang,Zhi Han,Jie Wang,Fu-Qiang Xu,Yu-Qi Feng
Liquid chromatography coupled with high-resolution mass spectrometry (LC-HRMS) has become the most versatile analytical tool for profiling small-molecule compounds and increasingly been applied in many fields. Nevertheless, LC-MS based quantification still face some challenges, such as signal drift in LC-MS, which may affect the validity of the obtained data and lead to misinterpretation of biological results. Here, we established a calibration method known as “RIM” to compensate the signal drift of LC-MS. To this end, a mixture of d 4 -2-dimethylaminoethylamine ( d 4 -DMED)-coded normal fatty acids (C5–C23) was used as calibrants to construct RIM calibration. With the addition of calibrants, not only the MS signal drift, but also the mass accuracy and LC retention time can be calibrated, thereby improving the reliability of quantitative data. The effectiveness of RIM was carefully validated using a human serum extract spiked with 34 standards and then RIM was applied for rat brain untargeted metabolome research. In addition, to expand the functionality and flexibility of RIM for data handling, we generated a MATLAB-based RIM program, which implements the above concepts and allows automatic data process. Taken together, the proposed RIM method has potential application in large-scale quantitative study of complex samples.
研究领域:
分析化学
·
生物信息学
·
医学研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2020
·Vol. 38
·期 3
·4241-4249
·
IF 5.627
Gongxin Dai,Guanyu Wang,Kaige Wang,Zhongyue Zhou,Shurong Wang
As one of the major components of lignocellulosic biomass , the current understanding on pyrolysis mechanism of hemicellulose is relatively limited compared to that of cellulose due to its random and complicated structure. Here, we reported an in-depth study on hemicellulose pyrolysis by combining advanced experimental techniques and quantum chemical calculation , using xylose , xylobiose and xylan as the model compounds. The structural evolution during pyrolysis was firstly characterized via in-situ diffuse reflectance infrared Fourier transform spectroscopy . The corresponding two-dimensional perturbation correlation infrared spectroscopy analysis shows that the dissociation of side chains dominates in the initial stage of xylan pyrolysis, followed by the cleavage of glycosidic bond and the opening of xylopyranose ring. The release behaviors of condensable vapors from hemicellulose pyrolysis obtained by thermogravimetric analyzer coupled with photoionization mass spectrometry indicate that the pyrolysis of xylan polymer with more side chains is prone to produce small compounds via ring rupture reactions compared to that of xylose and xylobiose . The possible reaction pathways of xylan pyrolysis were proposed based on the experimental results and were further confirmed via quantum chemical calculation. This work expands the size of model compounds from common monomers and dimers without side chains to larger tetramers with side chains. It was found that the dissociation of side chains and the cleavage of glycosidic bonds are competitive reactions. The backbone of xylan is decomposed following the dissociation of side chains to yield furfural , dianhydro xylose and other small compounds.
研究领域:
生物质能源
·
热化学转化
·
分析化学
·
量子化学
·
聚合物热解
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）