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| 1 | Titanium mesh for bone augmentation in oral implantology: current application and progress显示文摘Guided bone regeneration(GBR)is an effective and simple method for bone augmentation,which is often used to reconstruct the alveolar ridge when the bone defect occurs in the implant area.Titanium mesh has expanded the indications of GBR technology due to its excellent mechanical properties and biocompatibility,so that the GBR technology can be used to repair alveolar ridges with larger bone defects,and can obtain excellent and stable bone augmentation results.Currently,GBR with titanium mesh has various clinical applications,including different clinical procedures.Bone graft materials,titanium mesh covering methods,and titanium mesh fixing methods are also optional.Moreover,the research of GBR with titanium mesh has led to multifarious progresses in digitalization and material modification.This article reviews the properties of titanium mesh and the difference of titanium mesh with other barrier membranes;the current clinical application of titanium mesh in bone augmentation;common complications and management and prevention methods in the application of titanium mesh;and research progress of titanium mesh in digitization and material modification.Hoping to provide a reference for further improvement of titanium mesh in clinical application and related research of titanium mesh. | Yu Xie Songhang Li Tianxu Zhang Chao Wang Xiaoxiao Cai | 2020 | International Journal of Oral Science2020，12，4： | 22 |
| 2 | Prediction Model of Coal Reservoir Pressure and its Implication for the Law of Coal Reservoir Depressurization显示文摘The main methods of coalbed methane(CBM)development are drainage and depressurization,and a precise prediction of coal reservoir pressure is thus crucial for the evaluation of reservoir potentials and the formulation of reasonable development plans.This work established a new reservoir pressure prediction model based on the material balance equation(MBE)of coal reservoir,which considers the self-regulating effects of coal reservoirs and the dynamic change of equivalent drainage area(EDA).According to the proposed model,the reservoir pressure can be predicted based on reservoir condition data and the actual production data of a single well.Compared with traditional reservoir pressure prediction models which regard EDA as a fixed value,the proposed model can better predict the average pressure of reservoirs.Moreover,orthogonal experiments were designed to evaluate the sensitivity of reservoir parameters on the reservoir pressure prediction results of this proposed model.The results show that the saturation of irreducible water is the most sensitive parameter,followed by Langmuir volume and reservoir porosity,and Langmuir pressure is the least sensitive parameter.In addition,the pressure drop of reservoirs is negatively correlated with the saturation of irreducible water and the Langmuir volume,while it is positively correlated with porosity.This work analyzed the reservoir pressure drop characteristics of the CBM wells in the Shizhuangnan Block of the Qinshui Basin,and the results show that the CBM reservoir depressurization can be divided into three types,i.e.,rapidly drop type,medium-term stability type,and slowly drop type.The drainage features of wells were reasonably interpreted based on the comprehensive analysis of the reservoir depressurization type;the latter was coupled to the corresponding permeability dynamic change characteristics,eventually proving the applicability of the proposed model. | YAN Xinlu ZHANG Songhang TANG Shuheng LI Zhongcheng WANG Kaifeng YI Yongxiang DANG Feng HU Qiuping | 2019 | Acta Geologica Sinica(English Edition)2019，93，3： | 2 |
| 3 | A simple approach with scale-up potential towards intrinsically flame-retardant biobased co-plasticizer for PVC artificial materials显示文摘As an imitation of genuine leather,polyvinyl chloride(PVC)artificial materials are versatile,but suffers from being flammable due to the presence of large amounts of combustible plasticizers.Under such circumstance,intrinsically flame-retardant plasticizers displaying dual functions have been a subject of intensive research interest.However,previous strategies attempting to covalently attach flame-retardant moiety to plasticizers invariably required either expensive starting materials or laborious and tedious procedures,ultimately limiting their scale-up application in industry.In addition,driven by escalating demand of halogen-free flame retardants worldwide from an environmental health perspective,previously reported intrinsically flame-retardant plasticizers were mainly halogenfree,less attractive in PVC artificial material industry simply because PVC itself is a halogen-containing polymer.Here,we report an approach to introduce chlorine moieties into unsaturated fatty acid methyl ester by a simple addition reaction occurring on carbon-carbon double bonds,yielding a chlorine-containing,intrinsically flameretardant bio-plasticizer.When combined with di-(2-ethylhexyl)phthalate(DOP)in PVC formulations,the chlorinated fatty acid methyl ester is qualified as a co-plasticizer while conferring flame retardancy upon the PVC coatings.This approach involves only a one-step procedure that employs renewable fatty acid methyl esters and cheap chlorine gas as raw materials,thus being of great potential to enable intrinsically flame-retardant bioplasticizers on a large scale to manufacture functional PVC artificial materials for application in fire-prone scenarios. | Yong Xu Songhang Wang Jinming Chang Zhou Xu Qi Zeng Zhonghui Wang Jun Yan Yi Chen | 2020 | Journal of Leather Science and Engineering2020，2，1： | 0 |
| 4 | Evaluation of infill well pattern based on the dynamic change of reservoirs during coalbed methane development显示文摘With the deepening of coalbed methane(CBM)exploration and development,the problem of low gas production has gradually become one of the main factors restricting the development of the CBM industry in China.Reasonable well pattern deployment can improve the productivity of CBM wells and reduce the cost of production,while the reservoir changes of CBM wells play a important role for well pattern infilling.In this study,the dynamic characteristics of the average reservoir pressure(ARP),permeability,and drainage radius during the development process of CBM wells are systematically analyzed,and predicted the production changes of well groups before and after infilling wells in combination with the characteristics of reservoir changes.The results show that the high gas production wells have a larger pressure drop,long drainage radius,and a large increase in permeability.On the contrary,low gas production wells are characterized by small drainage radius,damaged permeability and difficult to recover.The productivity of infilled horizontal wells is predicted for two well groups with different productivity and reservoir dynamic characteristics.After infilling wells,the production of current wells has increased at different degrees.It is predicted that the average gas production of low gas production well group H1 and middle gas production well group H2 will increase 1.64 and 2.09 times respectively after 3000 days production simulation.In addition,the pressure interference between wells has increased significantly,and the overall gas production of the well group has greatly increased.Infill wells can achieve better development results in areas with superior CBM resources,recoverable reservoir permeability,and small drainage radius during the early production process.The research results provide a reference for the later infill adjustment of CBM well patterns in the study area. | Qian ZHANG Shuheng TANGI Songhang ZHANG Xinlu YAN Kaifeng WANG Tengfei JIA Zhizhen WANG | 2023 | Frontiers of Earth Science2023，17，3： | 0 |
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