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| 1 | Experimental study on influencing factors of acid-fracturing effect for carbonate reservoirs显示文摘Acid fracturing treatment is the key technique for stimulation and stable production in carbonate reservoirs.In order to improve the carbonate reservoirs acid fracturing effect,in this paper,with a large number of experiments as the main research methods,study on influencing factors of acidfracturing effect for carbonate reservoirs from increase the effective distance of living acid,increase acid corrosion eched fracture conductivity,reduce the acid fluid loss,etc.The effective distances of live acid calculated with reacted acid limitations measured in different acid systems are quite different from those calculated according to previous standard.Fracture conductivity is one of the key parameters that affects acid fracturing effects,but it's difficult to be predicted accurately due to the strong randomness of acid-rock reaction as well as various influence factors.Analyses of the impacts on fracture conductivity resulted from the rock embedment intensity,closure stress,acid dosage,rock-acid contact time,acid fluid loss,acid pumping rate through self-developed small-core fracture capacity test instrument.Fluid loss during acid fracture can be well controlled by thickened liquid as well as solid particles,but formation damage occurs inevitably.Foamed acid is a specific fluid with high viscosity,low fluid loss,small friction resistance,good retarding property,strong fracture making ability,easy flowback and low damage,which is an ideal acid system for low pressure and low permeability carbonate reservoirs.In this paper,the theoretical study on percolation mechanism and fluid-loss control mechanism of foam(acid)in porous medium are presented with the help of visual microscopic model fluid drive unit. | Nianyin Li Jinxin Dai Pingli Liu Zhifeng Luo Liqiang Zhao | 2015 | Petroleum2015，1，2： | 5 |
| 2 | Feasibility study on application of volume acid fracturing technology to tight gas carbonate reservoir development显示文摘How to effectively develop tight-gas carbonate reservoir and achieve high recovery is always a problem for the oil and gas industry.To solve this problem,domestic petroleum engineers use the combination of the successful experiences of North American shale gas pools development by stimulated reservoir volume(SRV)fracturing with the research achievements of Chinese tight gas development by acid fracturing to propose volume acid fracturing technology for fractured tightgas carbonate reservoir,which has achieved a good stimulation effect in the pilot tests.To determine what reservoir conditions are suitable to carry out volume acid fracturing,this paper firstly introduces volume acid fracturing technology by giving the stimulation mechanism and technical ideas,and initially analyzes the feasibility by the comparison of reservoir characteristics of shale gas with tight-gas carbonate.Then,this paper analyzes the validity and limitation of the volume acid fracturing technology via the analyses of control conditions for volume acid fracturing in reservoir fracturing performance,natural fracture,horizontal principal stress difference,orientation of insitu stress and natural fracture,and gives the solution for the limitation.The study results show that the volume acid fracturing process can be used to greatly improve the flow environment of tight-gas carbonate reservoir and increase production;the incremental or stimulation response is closely related with reservoir fracturing performance,the degree of development of natural fracture,the small intersection angle between hydraulic fracture and natural fracture,the large horizontal principal stress difference is easy to form a narrow fracture zone,and it is disadvantageous to create fracture network,but the degradable fiber diversion technology may largely weaken the disadvantage.The practices indicate that the application of volume acid fracturing process to the tight-gas carbonate reservoir development is feasible in the Ordovician Majiagou Formation of lower Paleozoic,which is of great significance and practical value for domestic tight-gas carbonate reservoir development and studies in the future. | Nianyin Li Jinxin Dai Chao Liu Pingli Liu Yanming Zhang Zhifeng Luo Liqiang Zhao | 2015 | Petroleum2015，1，3： | 4 |
| 3 | Quantum dots-hydrogel composites for biomedical applications显示文摘Quantum dots-hydrogel composites are promising new materials that have attracted extensive attention due to their incomparable biocompatibility and acceptable biodegradability, leading to enormous potential applications for various fields. This review summarizes the recent advances in quantum dots-hydrogel composites with a focus on synthesis methods, including hydrogel gelation in quantum dots(QDs) solution, embedding prepared QDs into hydrogels after gelation, forming QDs in situ within the preformed gel and cross-linking via QDs to form hydrogels. In particularly, biomedical applications as bioimaging,biosensing and drug delivery are also reviewed, followed by a discussion on the inherent challenges of design optimization, biocompatibility and bimodal applications and the prospect of the future development. These results will guide the development of quantum dots-hydrogel composites and provide critical insights to inspire researchers in future. | Wenjie Zhou Zhe Hu Jinxin Wei Hanqing Dai Yuanyuan Chen Siyu Liu Zhongtao Duan Fengxian Xie Wanlu Zhang Ruiqian Guo | 2022 | Chinese Chemical Letters2022，33，3： | 1 |
| 4 | Aqueous synthesis of 79%efficient AgInGaS/ZnS quantum dots for extremely high color rendering white light-emitting diodes显示文摘Over the past few decades,I-III-VI quantum dots(QDs)have attracted considerable attention due to their large Stokes shifts,good eco-friendliness,and wide tunable emissions.In this work,a facile microwave-assisted aqueous route using glutathione(GSH)and citric acid(CA)as dual stabilizers is introduced to synthesize AgInGaS/ZnS(AIGS/ZnS)core/shell QDs.An exceptional photoluminescence quantum yield(PL QY)as high as 79%is successfully achieved,boosting the best performance of water-dispersible AIGS QDs.By varying the Ag/Ga ratio,the PL peak wavelength can be tuned from 547 to 616 nm,and luminescent hydrogel films with different colors are obtained by embedding AIGS/ZnS QDs in polyacrylamide/poly-vinyl alcohol(PAAm/PVA)hydrogels.The white light-emitting diode(WLED)with a high color rendering index(CRI)of 92.1(R_(9)=92.0)and a correlated color temperature(CCT)of 3022 K is fabricated using QDs-PAAm/PVA hydrogel films in combination with a blue InGaN LED chip,indicating that the as-prepared QDs are competitive color-conversion materials for WLEDs. | Zhe Hu Hanxu Lu Wenjie Zhou Jinxin Wei Hanqing Dai b Hong Liu Zhiyong Xiong Fengxian Xie Wanlu Zhang Ruiqian Guo | 2023 | Journal of Materials Science & Technology2023，，3： | 1 |
| 5 | Molecular basis of Spns2-facilitated sphingosine-1-phosphate transport显示文摘Dear Editor,As one of the critical sphingolipid metabolites in eukaryotes,sphingosine-1-phosphate(S1P)acts as a bioactive lipid mediator in the immune and vascular systems.S1P prompts its physiological roles through two mechanisms,binding to its intracellular targets or extracellular secretion.Intracellular S1P promotes cellular proliferation,whereas plasma S1P facilitates immune cell trafficking,regulates angiogenesis,and helps to maintain vascular integrity.1 Due to the amphipathic property,S1P cannot diffuse freely but has to be transported across the cell membrane through active transport.1 In the past two decades,several S1P transporters have been identified,including two major facilitator superfamily(MFS)members:Spinster homolog 2(Spns2)and Mfsd2b,and some ATP-binding cassette family transporters.Among these transporters,Spns2 is the first identified and the most extensively studied.2 Here,we reported two cryo-electron microscopy(EM)structures of human Spns2 in inward-open conformations bound to S1P or inhibitor 16d. | Bin Pang Leiye Yu Tong Li Haizhan Jiao Xiaomei Wu Jinxin Wang Ruiping He Yurou Zhang Juan Wang Hongli Hu Wei Dai Li Chen Ruobing Ren | 2024 | Cell Research2024，34，2： | 0 |
| 6 | Influence of Halide Choice on Formation of Low-Dimensional Perovskite Interlayer in Efficient Perovskite Solar Cells显示文摘Recent advances in heterojunction and interfacial engineering of perovskite solar cells(PSCs)have enabled great progress in developing highly efficient and stable devices.Nevertheless,the effect of halide choice on the formation mechanism,crystallography,and photoelectric properties of the lowdimensional phase still requires further detailed study.In this work,we present key insights into the significance of halide choice when designing passivation strategies comprising large organic spacer salts,clarifying the effect of anions on the formation of quasi-2D/3D heterojunctions.To demonstrate the importance of halide influences,we employ novel neo-pentylammonium halide salts with different halide anions(neoPAX,X=I,Br,or Cl).We find that regardless of halide selection,iodide-based(neoPA)_(2)(FA)_((n-1))PbnI_((3n+1))phases are formed above the perovskite substrate,while the added halide anions diffuse and passivate the perovskite bulk.In addition,we also find the halide choice has an influence on the degree of dimensionality(n).Comparing the three halides,we find that chloride-based salts exhibit superior crystallographic,enhanced carrier transport,and extraction compared to the iodide and bromide analogs.As a result,we report high power conversion efficiency in quasi-2D/3D PSCs,which are optimal when using chloride salts,reaching up to 23.35%,and improving long-term stability. | Xueping Liu Thomas Webb Linjie Dai Kangyu Ji Joel A.Smith Rachel C.Kilbride Mozhgan Yavari Jinxin Bi Aobo Ren Yuanyuan Huang Zhuo Wang Yonglong Shen Guosheng Shao Stephen J.Sweeney Steven Hinder Hui Li David G.Lidzey Samuel D.Stranks Neil C.Greenham S.Ravi P.Silva Wei Zhang | 2022 | Energy & Environmental Materials2022，5，2： | 0 |
| 7 | A dynamic large-deformation particle finite element method for geotechnical applications based on Abaqus显示文摘In this paper,the application of Abaqus-based particle finite element method(PFEM)is extended from static to dynamic large deformation.The PFEM is based on periodic mesh regeneration with Delaunay triangulation to avoid mesh distortion.Additional mesh smoothing and boundary node smoothing techniques are incorporated to improve the mesh quality and solution accuracy.The field variables are mapped from the old to the new mesh using the closest point projection method to minimize the mapping error.The procedures of the proposed Abaqus-based dynamic PFEM(Abaqus-DPFEM)analysis and its implementation in Abaqus are detailed.The accuracy and robustness of the proposed approach are examined via four illustrative numerical examples.The numerical results show a satisfactory agreement with published results and further confirm the applicability of the Abaqus-DPFEM to solving dynamic large-deformation problems in geotechnical engineering. | Weihai Yuan Jinxin Zhu Neng Wang Wei Zhang Beibing Dai Yuanjun Jiang Yuan Wang | 2023 | Journal of Rock Mechanics and Geotechnical Engineering2023，15，7： | 0 |
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