检索结果-南通市图书馆

Volume of fluid simulation of single argon bubble dynamics in liquid steel under RH vacuum conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第4期31卷 828-837页

作者： gu-jun Chen Sheng-ping He College of Materials Science and Engineering Yangtze Normal UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

Single argon bubble dynamics in liquid steel under Ruhrstahl-Heraeus(RH)vacuum conditions were simulated using the volume of fluid method,and the ideal gas law was used to consider bubble growth due to heat transfer and pressure *** simulation with a constant bubble density was also performed to validate the numerical method,and the predicted terminal bubble shape and velocity were found to agree with those presented in the Grace diagram and calculated by drag correlation,*** simulation results under RH conditions indicate that the terminal bubble shape and velocity cannot be *** primary bubble growth occurs within a rising distance of 0.3 m owing to heating by the high-temperature liquid steel;subsequently,the bubble continues to grow under equilibrium with the hydrostatic *** the initial diameter is 8-32 mm,the bubble diameter and rising velocity near the liquid surface are 80-200 mm and 0.5-0.8 m/s,*** bubble rises rectilinearly with an axisymmetric shape,and the shape evolution history includes an initial sphere,(dimpled)ellipsoid,and spherical cap with satellite bubbles.

关键词： Bubble dynamics Liquid steel Volume of fluid Bubble growth Bubble shape Rising velocity

Prediction of liquid circulation flow rate in RH degasser:improvement of decarburization at low atmospheric pressure

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第7期31卷 1661-1667页

The two-fluid model coupled with population balance model was used for simulating the gas-liquid flow in the Ruhrstahl-Heraeus(RH)*** predicted circulation flow rate was compared with that measured from a water model experiment to validate the mathematical ***,influence of snorkel immersion depth on liquid circulation flow rate was numerically investigated under an atmospheric pressure of 101 and 84 kPa,*** result indicates that the circulation flow rate of the RH degasser in the high-altitude area was severely reduced because of the decrease in atmospheric ***,increasing the snorkel immersion depth from 0.5 to 0.7 m can compensate for the decrease in atmospheric *** test result indicates that decarburization rate is significantly enhanced by increasing the snorkel immersion *** optimization,the percentage of heats with a final carbon content less than 0.002 wt.%is significantly increased from 22.0%to 96.4%.

关键词： RH degasser Two-fluid model Population balance model-Circulation flow rate Decarburization Snorkel immersion depth

Retinoic acid inducible gene-I,more than a virus sensor

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Protein & Cell 2011年第5期2卷 351-357页

作者： Feng Liu jun gu National Key Laboratory of Protein Engineering and Plant Gene Engineering LSCPeking UniversityBeijing 100871China

Retinoic acid inducible gene-I(RIG-I)is a caspase recruitment domain(CARD)containing protein that acts as an intracellular RNA receptor and senses virus *** binding to double stranded RNA(dsRNA)or 5′-triphosphate single stranded RNA(ssRNA),RIG-I transforms into an open conformation,translocates onto mitochondria,and interacts with the downstream adaptor mitochondrial antiviral signaling(MAVS)to induce the production of type Ⅰ interferon and inflammatory factors via IRF3/7 and NF-κB pathways,***,accumulating evidence suggests that RIG-I could function in non-viral systems and participate in a series of biological events,such as inflammation and inflammation related diseases,cell proliferation,apoptosis and even *** we review recent advances in antiviral study of RIG-I as well as the functions of RIG-I in other fields.

关键词： retinoic acid inducible gene-I(RIG-I) antiviral signaling inflammation innate immunity

Deterministic controlled bidirectional remote state preparation in dissipative environments

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2022年第7期74卷 72-83页

作者： jun-Rong gu Jin-Ming Liu State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China

It is a significant subject to explore effective quantum communication protocol and enhance the efficiency of the transmission process in noisy environments. In this paper, we investigate the bidirectional controlled remote preparation of an arbitrary single-qubit state in the presence of dissipative environments by using two EPR states as the entanglement source. We first construct the quantum circuit of our scheme by means of unitary matrix decomposition procedure, then the effects of the Markovian and non-Markovian environmental noises acting on the EPR states are considered through the analytical derivation and numerical calculations of the corresponding average fidelity. Moreover, we adopt two methods of weak measurement reversal(WMR) and detuning modulation to improve the average fidelity. Our results show that the average fidelity can be remarkably enhanced under appropriate conditions of the WMR strength and the detuning. Compared with the average fidelity behaviors in dissipative environments, it is also shown that the two methods for fidelity improvement are more efficient in the non-Markovian regime than in the Markovian regime.

关键词： remote state preparation non-Markovian noise fidelity weak measurement reversal

Correlation Study on Sweetness of Amino Acid with Different Configurations and Quantum Chemical Parameters

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第5期25卷 589-593页

作者： LIjun-Ling gu jun QIU guang-Min College of Chemistry and Chemical Engineering China Universitry of Petroleum Dongying Shandong 257061 China College of Petroleum Engineering China University of Petroleum Dongying Shandong 257061 China

Quantum chemical parameters of 10 amino acids with D- and L-configurations were firstly calculated with semi-empirical AM1 method. Furthermore, the relationship between molecular structures of D-, L-amino acids and their sweetness were observed. The results show that upon different configurations of amino acids, the sweetness is relative with their formation heat, dipole moment, energy gap of frontier orbital and other parameters. The formation heats of the same amino acids possessing D- and L-configurations are different except glycine. The algebraic value of D-amino acid is generally larger than that of corresponding L-configuration with only one except of tyrosine. The dipole moment of D-amino acid is generally larger than that of corresponding L-amino acid except tyrosine and lysine. The lowest unoccupied orbital energy （ELUMO） of D-amino acid is higher than that of corresponding L-configuration except phenylalanine. △E of D-amino acid is larger than that of L-amino acid except histidine, phenylalanine and lysine. The larger gap will have advantage for its matching with frontier orbital energy of human protein acceptor, which strengthens the interaction between D-amino acid and sweet taste acceptor. Besides, the changing rules of these parameters are generally identical.

关键词： amino acid sweetness AMI semi-empirical method quantum chemical parameter

Self-Recirculating Casing Treatment for a Radial Compressor

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2009年第4期22卷 567-573页

作者： XIAO jun XU Wei gu Chuangang SHU Xinwei Key Laboratory for Power Machinery and Engineering of Ministry of Education Shanghai Jiao Tong University Shanghai 200240 China

Casing treatment is a widely employed technique to increase the stall margins of turbomachineries. In the last several decades, many researches on casing treatment have been carded out. However, the mechanism of its expanding stall margins is still not very clear. Till now, most casing teatment schemes are designed for axial compressors, while the investigations on casing treatments in centrifugal compressors are rarely reported. Moreover, current investigation methods mainly focus on experiments, and perfect theoretic al analysis is not yet feasible. In order to study the effectiveness and further the mechanism of casing treatments in centrifugal compressors, in this paper, a computationally based investigation of the impact of the self-recireulating casing treatment on the performance of a radial compressor is carried out. The results indicate that, by casing bleed and injection, the casing treatment with inclined blades in the cavity expands the stall margin most. At low mass flows, the reversed flow through the cavity with inclined blades develops the counter swirl flow in front of the impeller inlet, which is considered to benefit increasing the pressure rise from the injection port to the bleed port and thereby augment the recirculating flow. At 120% design speed, the stall margin is larger than that at the design speed. However, the cost of extending the stall margin is the reduction of isentropic efficiency. A mended casing treatment by shifting the bleed port upstream is also studied. It is demonstrated that, relative to the original casing treatment, this mend can improve the efficiency evidently notwithstanding a little narrowing of the flow range.

关键词： self-recirculating casing treatment bleed injection stall margin

Dissolved methane in anaerobic effluent:Emission or recovery?

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2022年第4期16卷 161-163页

作者： Xiaoyuan Zhang jun gu Shujuan Meng Yu Liu Advanced Environmental Biotechnology Centre Nanyang Environment&Water Research InstituteNanyang Technological UniversitySingapore 637141Singapore Department of Environmental Science and Engineering School of Energy and EnvironmentSoutheast UniversityNanjing 210096China School of Space and Environment Beihang UniversityBeijing 100191China School of Civil and Environmental Engineering Nanyang Technological UniversitySingapore 639798Singapore

Various anaerobic processes have been explored for the energy-efficient treatment of municipal ***,dissolved methane in anaerobic effluent appears to be a barrier towards the energy and carbon neutrality of wastewater *** several dissolved methane recovery methods have been developed,their engineering feasibility and economic viability have not yet been assessed in a holistic *** this perspective,we thus intend to offer additional insights into the cost-benefit of dissolved methane recovery against its emission.

关键词： Anaerobic treatment Municipal wastewater Dissolved methane Methane recovery Carbon emission

Special Issue: Functional Polymer Materials

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第7期42卷 895-896,I0004页

作者： jun-Wei gu Du-Jin Wang Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical Engineering Northwestern Polytechnical University Xi’an 710072 China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Engineering Plastics Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

The rapid development of science has led to a significant role for polymer materials in multitude fields,including industry,medicine,energy,and the environment,*** a leading academic journal in the field of polymer,Chinese Journal of Polymer Science has been dedicated to fostering the advancement and utilization of polymer science.

关键词： polymer Polymer Functional

APPLICATION OF WEIGHTED NONOSCILLATORY AND NON-FREE-PARAMETER DISSIPATION DIFFERENCE SCHEME IN CALCULATING THE FLOW OF VIBRATING FLAT CASCADE

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2007年第6期20卷 69-73页

作者： XIAO jun gu Chuangang SHU Xinwei Key Laboratory for Power Machinery and Engineering Ministry of Education Shanghai Jiaotong University Shanghai 200030 China

A dual-time method is introduced to calculate the unsteady flow in a certain vibrating flat cascade. An implicit lower-upper symmetric-gauss-seidel scheme（LU-SGS） is applied for time stepping in pseudo time domains, and the convection items are discretized with the spatial three-order weighted non-oscillatory and non-free-parameter dissipation difference （WNND） scheme. The turbulence model adopts q-co low-Reynolds-number model. The frequency specmuns of lift coefficients and the unsteady pressure-difference coefficients at different spanwise heights as well as the entropy contours at blade tips on different vibrating instants, are obtained. By the analysis of frequency specmuns of lift coefficients at three spanwise heights, it is considered that there exist obvious non-linear perturbations in the flow induced by the vibrating, and the perturbation frequencies are higher than the basic frequency. The entropy contours at blade tips at different times display an intensively unsteady attribute of the flow under large amplitudes.

关键词： Vibrating cascade Weighted non-oscillatory and non-free-parameter dissipation difference scheme Frequency spectrum of lift coefficient Unsteady pressure-difference coefficient