BIORESOURCE TECHNOLOGY
·
2014
·
IF 5.039
Yangyang Qian,Jie Zhang,Jie Wang
The pyrolysis of rice husk was conducted in a fixed-bed reactor with a sweeping nitrogen gas to investigate the effects of pressure on the pyrolytic behaviors. The release rates of main gases during the pyrolysis, the distributions of four products (char, bio-oil, water and gas), the elemental compositions of char, bio-oil and gas, and the typical compounds in bio-oil were determined. It was found that the elevation of pressure from 0.1 MPa to 5.0 MPa facilitated the dehydration and decarboxylation of bio-oil, and the bio-oils obtained under the elevated pressures had significantly less oxygen and higher calorific value than those obtained under atmospheric pressure. The former bio-oils embraced more acetic acid, phenols and guaiacols. The elevation of pressure increased the formation of CH 4 partially via the gas-phase reactions. An attempt is made in this study to clarify “the pure pressure effect” and “the combined effect with residence time”.
研究领域:
能源科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
An Huang,Yanqiong Bao,Houpei Li,Yu Liu,Xiong Zheng,Guangzhao Qin
Binary mixtures of ethylene glycol and water are widely used as working fluids in many areas, and the study of thermal conductivity is crucial in the determination of the heat transfer properties of related systems. In this paper, the thermal conductivity of these binary mixtures at a series of ethylene glycol concentrations (0 to 100 wt%) is measured experimentally using a transient hot-wire system at evaluated temperature and pressure range from 293–533 K and 0.1–15.0 MPa. Moreover, the experimental data are fitted into an equation as a function of temperature, pressure, and concentration, the average absolute deviation and maximum deviation between fitted values and experimental data are 0.29 % and 1.05 %, respectively, which shows that this equation describes our data very well. Furthermore, available experimental data in the literature are collected and the comparisons between literature data and our data are analyzed, our data agree well with most literature data. This work is expected to promote the use of binary mixtures of ethylene glycol and water as heat transfer working fluids in industries.
研究领域:
工程热物理
·
化学工程
✓ 已验证
DOI
高影响因子
Synthetic and Systems Biotechnology
·
2025
·
IF 4.4
Ying Wang,Ruosi Zhang,Mingdong Yao,Wenhai Xiao,Ying Wang,Ying-Jin Yuan
Progesterone is a widely used therapeutic hormone and a common precursor for the synthesis of pharmaceutical steroids in both mammals and plants. It has been successfully produced in heterologous microorganisms, but the market demand has not been met. The low progesterone yield, possibly due to product stress, may put pressure on the growth of strains and limit product synthesis efficiency. In this study, key pathways and genes that cause changes in amino acid and lipid metabolism and protein transport were identified through omics analysis. The expression of transporters leads to increased progesterone production and alleviated growth inhibition. Two related genes (gene IDs: 2912325 and 2908366) encoding the transporters glpF and SNQ2 improved production by 29.2% and 51.7%, respectively. Isoenzymes of native and exogenous transporters were screened and overexpressed. YCF1 from Saccharomyces cerevisiae exhibited the greatest benefit, increasing progesterone synthesis by 69.6%. Our findings help reveal the impact of product stress on cellular metabolism and processes, providing research directions and literature support for the synthesis of other products.
研究领域:
生物化学
·
合成生物学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FLUID PHASE EQUILIBRIA
·
2024
·
IF 2.8
Yuxuan Chen,Wanlin Xu,Mengyi Wang,Xiong Zheng
Thermal conductivity is a very important thermal property parameter in the process of hydrocarbons transportation, storage, combustion and cooling. Therefore, accurate thermal conductivity is important in the utilization of hydrocarbons. In this work, the thermal conductivity of n-hexane and n-heptane in the temperature range of 298.15 K∼523.15 K and pressure range of 0.1 MPa∼15.0 MPa was studied by using transient hot-wire method. In order to facilitate engineering application, function polynomials of temperature and pressure are fitted and correlated with experimental data. The average absolute error of the experimental data and fitting data of n-hexane and n-heptane are 0.72 and 0.61 %, respectively, which proves that the function polynomial can describe the experimental data well. In addition, we compare the collected literature data with our results and find that the literature data is very close to our results. This work is expected to expand the range of available data on the thermal conductivity of n-hexane and n-heptane and contribute to the industrial applications of these two substances.
研究领域:
热物理学
·
工程热物理
✓ 已验证
产品关联
DOI
高影响因子
Device
·
2025
·
IF 8
Y. Ming,C.Y. Zhang,X. Kang,X.X. Wang,J.J. Xu,S. Liang,D.W. Zeng
Flexible pressure sensors have a wide range of application scenarios for detecting pressure. However, the entanglement between polymer chains limits their ability to capture extremely weak dynamic pressure. This study presents a multiphase design concept to address the issue. Here, a solid-gas-liquid multiphase sensor (MPS) is proposed, which comprises an air cavity, ordered electrodes based on vertically aligned carbon nanotubes, and porous ionic membranes with surface microstructures and internal ions. The sensor achieves an extremely low limit of detection (LOD) (0.098 Pa) and fast response (5 ms), enabling effective capture and decoding of extremely weak dynamic pressure. By combining a sensor with machine learning, an interactive system is constructed, enabling the decoding of subtle vibrations in the throat muscles when a person is speaking, with or without vocalization. This work provides design concepts for high-performance sensors and ideas for easily integrable, portable interactive systems and identity security technologies.
研究领域:
柔性电子学
·
传感器
·
纳米技术
·
人机交互
·
机器学习应用
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Song Feng,Zhaohui Liu,Qincheng Bi,Hui Pan
The dynamic viscosities of n-dodecane were measured at temperatures between 303.3 and 693.3 K and pressures up to 10.0 MPa using a dual-capillary viscometer. The accuracy of the dual-capillary viscometer was improved by considering centrifugal effects and the thermal expansion of the capillary. The combined relative standard uncertainty in the dynamic viscosity was calculated to be 0.58–2.92 %. This study provides new data to check the accuracy of Huber’s correlations at supercritical pressures, and a small proportion of the data points at supercritical conditions where few experimental data have been reported. The average absolute deviation between the experimental data and the calculated data from Huber’s correlations is 0.97%, and the maximum absolute deviation is 6.79%. In the near-critical and supercritical region, the accuracy of viscosities of n-dodecane needs more experimental data for verification and to extend the theories.
研究领域:
化学工程
·
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Yue Pan,Xiaohong Yuan,Yong Cheng,Baoyin Xu,Shucheng Liu,Zhitong Wang,Shida Wang,Kuo Hu,Shengcai Zhu,Quanjun Li,Ming-sheng Wang,Zhaodong Liu,Hu Tang,Bingbing Liu
Synthesizing fully sp 3 -bonded non-crystalline carbon remains a long-standing challenge due to the intrinsic instability of the sp 3 bond at ambient pressure. Recently, paracrystalline diamond, a new-form sp 3 -bonded non-crystalline carbon consisting of sub-nanometer-sized paracrystallites, has been synthesized from face-centered cubic C 60 at 30 GPa, which has attracted attention due to its unique structural features and excellent physical properties. However, the ultrahigh synthesis pressure of paracrystalline diamond poses an obstacle to its large-scale production and applications. In this study, paracrystalline diamond is synthesized at an exceptionally low pressure (16 GPa) via inducing uniaxiality at high-pressure and high-temperature conditions, thereby breaking through the temperature-pressure phase diagram of C 60 . By combining structural characteristics and advanced molecular dynamics simulation, the remarkable reduction of synthesis pressure is attributed to the fact that the symmetry of the C 60 cage is broken due to the uniaxiality, which further allows the C 60 cage to collapse at much lower pressures. This work reveals the critical role of uniaxiality in the reduced-pressure synthesis of paracrystalline diamond, which may provide a potent methodological strategy for the development of novel low-cost high-pressure materials.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS
·
2024
·Vol. 24
·期 5
·1640
·
IF 3.4
Zhangling Li,Tong Guan,Wuxu Zhang,Jinyun Liu,Ziyin Xiang,Zhiyi Gao,Jing He,Jun Ding,Baoru Bian,Xiaohui Yi,Yuanzhao Wu,Yiwei Liu,Jie Shang,Runwei Li
Elastic pressure sensors play a crucial role in the digital economy, such as in health care systems and human–machine interfacing. However, the low sensitivity of these sensors restricts their further development and wider application prospects. This issue can be resolved by introducing microstructures in flexible pressure-sensitive materials as a common method to improve their sensitivity. However, complex processes limit such strategies. Herein, a cost-effective and simple process was developed for manufacturing surface microstructures of flexible pressure-sensitive films. The strategy involved the combination of MXene–single-walled carbon nanotubes (SWCNT) with mass-produced Polydimethylsiloxane (PDMS) microspheres to form advanced microstructures. Next, the conductive silica gel films with pitted microstructures were obtained through a 3D-printed mold as flexible electrodes, and assembled into flexible resistive pressure sensors. The sensor exhibited a sensitivity reaching 2.6 kPa−1with a short response time of 56 ms and a detection limit of 5.1 Pa. The sensor also displayed good cyclic stability and time stability, offering promising features for human health monitoring applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Qi Zhou,Taotao Zhan,Junshuai Chen,Maogang He,Ying Zhang
n -Decane is a major ingredient of many transportation fuels, and is widely used as the additive in engineering domain. To supplement the existing database, the speed of sound in n -decane was measured along five isobaric lines from (0.1 to 10) MPa and at temperatures between (298.32 and 653.93) K by the Brillouin light scattering method. With the level of confidence of 0.95 (coverage factor k = 2), the relative expanded uncertainty of our measurement system and that of the experimental speed of sound in n -decane were estimated to be less than 1.1% and 1.7%, respectively. Besides, the absolute average percentage deviation and the maximum deviation of the experimental results from values calculated with the recommended fundamental equation in the NIST Standard Reference Database 23 were found to be 1.0% and 4.4%, respectively. At the end, for temperatures between (303.15 and 373.15) K and at pressures up to 10 MPa, the derived properties of n -decane including density, isobaric heat capacity, isobaric thermal expansion, isothermal compressibility, isentropic compressibility and internal pressure were studied.
研究领域:
物理化学
·
工程热力学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2018
·
IF 4.908
Yi Wei,Jijian Hong,Weirong Ji
Digestate, the residue following of anaerobic digestion , had attracted great attention recently as potential feedstock of pyrolysis . The results of component analysis verified that digestate was suitable for phenol production due to its considerable lignin content. The thermal degradation of lignin in digestate mainly occurred around 350–450 °C in thermogravimetric analysis . The amorphous cellulose in digestate decomposed to short-chain acids, water and syngas rather than furfural at low temperature around 280 °C. Pyrolysis of digestate for phenol production was conducted under different reaction temperature and pressure. High reaction temperature contributed to phenol formation by facilitating the cleavage reactions of β-O-4 and C–C linkages among three phenylpropane units in lignin. Pyrolysis pressure promoted secondary monomolecular dissociation reactions of methoxyphenol to yield phenol and alkyl-phenol. The maximum phenolics (70.4%) and phenol (42.6%) contents were achieved at 450 °C with 5 MPa pressure in this work.
研究领域:
生物能源
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Qiming Zhang,Guodong Cui,Xiao He,Zheng Wang,Tian Tang,Qing Zhao,Yangsheng Liu
Electro-dewatering technology shows a good application prospect because of its high efficiency in removing water from sludge and low energy consumption, but the potential mechanisms of sludge electro-dewatering have not been investigated in depth, which seriously limits the further development and application of electro-dewatering technology. In this study, the effects of voltage and pressure on sludge electro-dewatering performance, physicochemical characteristics and extracellular polymeric substances (EPS) compositions and distributions were investigated. The spatial distributions of EPS main components, including polysaccharide (PS) and protein (PN), were characterized by a confocal laser scanning microscopy (CLSM). The experimental results showed that under the conditions of a voltage of 40 V and a pressure of 90 kPa, the moisture content of sludge was reduced from 83.15% to 53.12%, and the bound water content of sludge in the anode layer, middle layer and cathode layer were decreased significantly from 1.16 g/g dry solid (DS) to 0.20, 0.47 and 0.35 g/g DS, respectively. The PN content of EPS in anode layer was significantly lower than that in cathode layer due to the electrochemical oxidation , while the variation of PS content showed the opposite trend, which agreed with the results visualized by CLSM. Pearson's correlation coefficient and hierarchical cluster analysis revealed that PN in TB-EPS was the major factor influencing the effect of sludge electro-dewatering. This work can be helpful to understand the potential mechanisms of electro-dewatering and provide theoretical support for the further popularization and application of electro-dewatering technology.
研究领域:
环境科学
·
污水处理
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2021
·
IF 3.314
Qi Huang,Yadong Jiang,Zaihua Duan,Zhen Yuan,Bohao Liu,Yajie Zhang,Qiuni Zhao,Yongliang Li,Huiling Tai
Carbon nanotubes (CNTs) have broad application prospects in flexible pressure sensors because of their superior mechanical and electrical performance. However, the pressure sensitivity of a pure CNT sensor needs to be enhanced. Herein, a zinc oxide–carbon nanotube (ZnO–CNT) sensor with a protrusion microstructure was prepared to improve the pressure sensitivity of a pure CNT sensor. The results show that the ZnO–CNT sensor achieves a higher pressure sensitivity (8.79 times) than that of the pure CNT sensor. In addition, the ZnO–CNT sensor achieves fast response (125.28 ms), good durability (over 6000 cycles), and a high upper detection limit (up to 422.22 kPa). The enhancement in sensitivity of the ZnO–CNT sensor is explained by the finite element simulation. Benefiting from these characteristics, the ZnO–CNT sensor is expected to be applied in human physiological signs and motion monitoring.
研究领域:
材料科学
·
纳米技术
·
传感器
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）