16 Result(s)

Article

Study on the impact resistance of prefabricated fractured red sandstone samples with different dip angles reinforced by bolt-grouting

With the development of underground engineering, dynamic disasters, such as rock bursts, are becoming increasingly serious. Bolt-grouting combined support is one of the common support methods, aiming at the pr...

Dafang Yang, Jiasai Li, Shuxue Ding… in Bulletin of Engineering Geology and the En… (2023)

Article

Nonlinear Constitutive Model of Rock Joint in Geological Structure and Application of Implicit Return Map** Algorithm

As a common geological structure, rock joints have a great influence on the mechanical properties and stability of rock mass engineering. The shear constitutive model of the rock joint and its calculation meth...

Wenlin Feng, Chunsheng Qiao, Ming-Yu Feng… in Arabian Journal for Science and Engineering (2022)

Article

Analysis of Shear Characteristics of Cohesive Soil and Rigid Base: A Case Study of Concrete Base

Taking the concrete as an example, this paper studies the shear characteristics of the cohesive soil and rigid base. A series of shear tests are conducted by the refitted DSJ-2 electric four-joint equal stress...

Dafang Yang, Shuangjian Niu, Yanyan Cai… in Geotechnical and Geological Engineering (2021)

Article

Study on Improved Nonlinear Viscoelastic-Plastic Creep Model Based on the Nishihara Model

The description of rock creep by existing rheological models mainly focuses on the first two stages of creep. However, the description of the accelerated creep stage is rare, which is contrary to the common st...

Mingyuan Yu, Baoguo Liu, **glai Sun… in Geotechnical and Geological Engineering (2020)

Article

Study on sandstone creep properties of Jushan Mine affected by degree of damage and confining pressure

Creep characteristics of rock mass are related not only to the confining pressure but also to the degree of internal fracture damage. Revealing the creep characteristics of rock mass under different confining ...

Wenlin Feng, Chunsheng Qiao, Shuangjian Niu in Bulletin of Engineering Geology and the En… (2020)

Article

Experiment and Study on Mechanical Property of Sandstone Post-peak Under the Cyclic Loading and Unloading

Engineering research has shown that the surrounding rock of deep roadways experienced many times of post-peak cyclic loading and unloading. So studying on rock mechanical characteristics of post-peak loading a...

Dafang Yang, Dingyuan Zhang, Shuangjian Niu… in Geotechnical and Geological Engineering (2018)

Article

Synaptic plasticity in the facial nucleus in rats following infraorbital nerve manipulation after facial nerve injury

The aim of this study is to investigate the effect of sensory input on the neural plasticity in the facial nucleus following facial nerve injury. Adult male Wistar rats were randomly assigned to four groups: (...

Wenyan Sun, Wenlin Feng, Haitao Lu… in European Archives of Oto-Rhino-Laryngology (2016)

Article

IRC analysis of methanol carbonylation reaction catalyzed by rhodium complex

In the reaction cycle for methanol carbonylation catalyzed by Rh complex, the structure geometries of the reactant, intermediates, transition states and product of each elemental reaction have been studied by ...

Maorong Hao, Wenlin Feng, Yongqiang Ji, Ming Lei in Science in China Series B: Chemistry (2004)

Article

Implementation of a microcanonical variational transition state theory for direct dynamics calculations of rate constants

An implementation of the variational quantum RRKM program is presented to utilize the direct ab initio dynamics approach for calculating k(tE, J), k(E) and k(T) within the framework of the microcanonical transiti...

Yan Wang, Ying Qian, Wenlin Feng, Ruozhuang Liu in Science in China Series B: Chemistry (2003)

Article

Ab initio study on the mechanism of reaction HNCO+NH₂

Ab initio UMP2 and UQCISD(T) calculations, with 6-311G** basis sets, were performed for the titled reactions. The results show that the reactions have two product channels: NH₂+ HNCO?NH₃+NCO (1) ...

Yongqiang Ji, Wenlin Feng, Zhenfeng Xu, Ming Lei in Science in China Series B: Chemistry (2002)

Article

Ab initio study on the mechanism of rhodium-complexcatalyzed carbonylation of methanol to acetic acid

The whole catalytic cycle of the carbonylation of methanol to acetic acid catalyzed by Rh complex is theoretically studied. All structural geometries of reactant, intermediates, transition states and product a...

Ming Lei, Wenlin Feng, Maorong Hao, Yongqiang Ji… in Science in China Series B: Chemistry (2001)

Article

Theoretical investigation on regioselectivity of aromatic ketones in the addition with olefin catalyzed by RuH₂(CO)(PPh₃)₃

Ab initio method is employed to study the structures of twelve aromatic ketones at HF/3-21G, HF/6-31G and HF/6-31G* levels, respectively. A theoretical analysis is also carried out to study the r...

Ming Lei, Wenlin Feng, Hongguang Du, Zhenfeng Xu in Science in China Series B: Chemistry (2000)

Article

Ab initio MO study of reaction mechanism for carbonyl migration of Co complex

Ab initio method under the effective core potential (ECP) approximation is employed to study the reaction mechanism of carbonyl migration of the cycle of olefin hydroformylation catalyzed by a ca...

Ming Lei, Wenlin Feng, Zhenfeng Xu in Chinese Science Bulletin (2000)

Article

Theoretical calculation of rate constants for the thermal isomerization from 1, 2-butadiene to 1, 3-butadiene

Ab initio electronic structure calculations at 6-31G** level were performed to determine the mechanism of the isomerization reaction from 1, 2-butadiene to 1, 3-butadiene. The MP2 method was used...

Yan Wang, Wenlin Feng, Ming Lei, Ruozhuang Liu in Science in China Series B: Chemistry (1998)

Article

Theoretical investigation on mechanism of dissociation of furan

According to the calculated results for the dissociation mechanism of C₄H₄O⁺, we come to a conclusion as follows:

1. Reaction (1)...

Wenlin Feng, Yan Wang, Shaowen Zhang, Hongwei **, **anyong Pang in Chinese Science Bulletin (1997)