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Search Results: 1 - 10 of 127150 matches for " Jingjie Li "
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Effect of hafnium addition on solidifi cation structure of cast Ti-46Al alloys
Su Yanqing,Zhang Li,Guo Jingjie
China Foundry , 2008,
Abstract: To investigate the effect of hafnium addition on the solidifi cation structure, Ti-46Al alloys with nominal compositions of Ti-46Al-xHf (x = 0, 3, 5, 7) (at.%) were arc-melted into small ingots in an argon atmosphere. The characteristics of the macrostructures and microstructures were studied using a linear intercept method, OM, SEM (BSE), XRD and TEM. The results showed that the ingots with Hf have near lamellar microstructure in columnar and dendrite morphology. The hafnium concentration has a strong effect on the columnar spacing refi nement. Increasing Hf from 0 to 7 (at.%), the columnar spacing can be reduced from ~ 1000 to ~ 400 μm. Constitute phases of the ingots are α2, a small amount of B2 and c. Most of the B2 phases, richer in Hf and leaner in Al and Ti, exist on the node of the dendrite core in block shape and a little across the lamellar colonies in stick shape. The c phases exist on the boundaries of lamellar colonies in small cellular shape. There also exists a segregation of Hf on the columnar and dendrite core. Particularly, both the α- and β-phase form from the melt as prior phases. The possible phase sequencing during solidifi cation and solid-state transformations with Hf is given in this paper.
Cow placenta extract promotes murine hair growth through enhancing the insulin - like growth factor-1
Zhang Dongliang,Gu Lijuan,Li Jingjie,Li Zheng
Indian Journal of Dermatology , 2011,
Abstract: Background: Hair loss is seen as an irreversible process. Most research concentrates on how to elongate the anagen, reduce the negative factors of obstructing hair growth and improve the hair number and size. Aim: In our experiment, we tried to prove that the cow placenta extract can promote hair growth by elongating hair shaft and increasing hair follicle number. Materials and Methods: Cow placenta extract (CPE), water and minoxidil applied separately on the back of depilated B57CL/6 mice for the case, negative and positive control respectively. We checked the proliferation of cells which are resident in hair sheath, and the expression of a few growth factors which stimulate hair growth. Results: Result shows that placenta extract more efficiently accelerates cell division and growth factor expression, by raising the insulin-like growth factor (IGF-1) mRNA and protein level to increase HF size and hair length. Conclusions: The extract is not a purified product; so, it is less effective than minoxidil, which is approved by the US FDA for the treatment of male pattern baldness. If refinement is done, the placenta extract would be a good candidate medicine for hair loss.
Application of Audio-Magnetotelluric Method for Exploration the Concealed Ore-Bodies in Yuele Lead-Zinc Ore Feild, Daguan County, NE Yunnan Province, China  [PDF]
Tran Trong Lap, Chuandong Xue, Aiying Wei, Lv Liu, Wenyao Li, Qiquan Hu, Jingjie Li, Dafeng Luo, Shaoyong Zhu, Tiangui Zhang
Journal of Geoscience and Environment Protection (GEP) , 2014, DOI: 10.4236/gep.2014.23005
Abstract:

The results of recent mineral exploration in the Yuele lead-zinc mining area of Daguan County, northeastern Yunnan province, showed that there are much early Paleozoic strata under thick late Paleozoic strata in northeastern Yunnan province, where developed some hidden salt structures (SSs), often with lead-zinc polymetallic mineralization varying degrees along the tension torsional fault (belts) or fracture (joint). The ore-bodies belong to the epigenetic hydrothermal filling vein-type deposit, and the prospecting potential is great. In this area, the superficial mineralization information displayed clear, but the deep mineralization is unknown, so the exploration work is restricted. The audio-megnetotelluric (AMT) surveying is an advantageous method to characterize the size, resistivity and skin depth of the polarizable mineral deposit concealed beneath thick overburden. This paper presents the surveying results using AMT method to evaluate the concealed lead-zinc mineralization in Yuele lead-zinc ore field, Daguancounty, NE Yunnan province, China. After comparing the interpretation result of AMT surveying data with the geological data and the drilling data, it is found that there is some distinct difference in resistivity and polarizable between ore-bodies hosted strata, upper strata and gypsum strata. The results show that AMT method is helpful to identify lead-zinc mineralization under this geological condition.

EUTECTIC GROWTH OF CAST IRON UNDER RAPID SOLIDIFICATION
GUO Jingjie JIA Jun LI Qingchun LI Bangsheng Harbin Institute of Technology,Harbin,China,
GUO Jingjie JIA Jun LI Qingchun LI Bangsheng Harbin Institute of Technology
,Harbin,China

金属学报(英文版) , 1992,
Abstract: The eutectic growth of cast iron during rapid solidification has been studied with laser remelt- ing and deep etching technology.A new mode of mushroom eutectic growth was observed oth- er than the usual honeycomb and lamellar ones.The mushroom eutectic growth may finally form the lamellar dendritic structure.
Clinical and radiographic outcomes of the treatment of adolescent idiopathic scoliosis with segmental pedicle screws and combined local autograft and allograft bone for spinal fusion: a retrospective case series
Xiaoming Yang, Hongguang Xu, Ming Li, Suxi Gu, Xiutong Fang, Jingjie Wang, Jianqiang Ni, Dajiang Wu
BMC Musculoskeletal Disorders , 2010, DOI: 10.1186/1471-2474-11-159
Abstract: A combination of in situ local autograft bone and freeze-dried cancellous allograft blocks were used in 50 consecutive patients with adolescent idiopathic scoliosis treated by posterior fusion and Moss Miami pedicle screw instrumentation. Results were assessed clinically and radiographically and quality of life and functional outcome was evaluated by administration of a Chinese version of the SRS-22 survey.There were 41 female and 9 male patients included for analysis with an average age of 14.7 years (range, 12-17). All patients had a minimum follow-up of 18 months (range, 18 to 40 months). The average preoperative Cobb angle was 49.8° (range, 40° to 86°). The average number of levels fused was 9.8 (range, 6-15). Patients had a minimum postoperative follow-up of 18 months. At final follow-up, the average Cobb angle correction was 77.8% (range, 43.4 to 92.5%). There was no obvious loss in the correction, and the average loss of correction was 1.1° (range, 0° to 4°). There was no pseudarthrosis and no major complications.In situ autograft bone combined with allograft bone may be a promising method enhances spinal fusion in AIS treated with pedicle screw placement. By eliminating the need for iliac crest bone harvesting, significant morbidity may be avoided.The iliac crest is considered the best source of autograft bone for procedures treating bone nonunion, spinal fusion, and specifically posterior spinal fusion in corrective surgery for adolescent idiopathic scoliosis (AIS). However, studies have reported numerous complications associated with harvesting iliac crest bone including bleeding, infection, gait disturbance, neurological injury, fracture, and persistent donor site pain, with an incidence ranging from 24% to 29% [1-3]. The high morbidity of iliac crest bone graft harvesting has limited its application. Allograft bone has the advantages of adequate supply and variety of type, and reports indicate that allograft bone is a suitable alternative to autogenous b
Formation Mechanism of Microstructure of Melt Spun Al-In Immiscible Alloys
Formation Mechanism of Microstructure of Melt Spun Al—In Immiscible Alloys

Yuan LIU,Yanxiang LI,Jingjie GUO,Jun JIA,
YuanLIU
,YanxiangLI,JingjieGUO,JunJIA

材料科学技术学报 , 2003,
Abstract: Immiscible alloys are attractive for their valuable physical and mechanical properties. In this paper, Al-ln immiscible alloy is prepared by melt spinning process and its morphological evolution is studied at various indium contents. The results show that the morphologies of the matrix phase depend on the indium content. Different morphologies lead to different distribution of the second phase particles. Due to a particular solidification mechanism of immiscible alloys, even under the melt spinning rapid solidification condition, it is still impossible to produce homogeneous Al-ln hypomonotectic alloy ribbons. But for Al-ln hypermonotectic alloys, there is almost no segregation of the second phase throughout the cross section of the ribbons.
STRUCTURE EVOLUTION OF DIRECTIONALLY SOLIDIFIED Ti--43Al--3Si ALLOY II. Microstructure Evolution in the Steady--State Growth Region

LI Xinzhong,FAN Jianglei,GUO Jingjie,SU Yanqing,FU Hengzhi,

金属学报 , 2009,
Abstract: Microstructure evolutions in the steady--state growth region of directionally solidified Ti--43Al--3Si (atomic fraction, %) alloy were studied at growth rates of 3---100 μm/s. There are four main phase transitions during directional solidification: L→Ti5Si3, L→α+Ti5Si3, α→α2(Ti3Al)+γ(TiAl) and α2→γ+Ti5Si3, especially, the eutectic reaction of α and Ti5Si3 is the typical solidification behavior. When the growth rate exceeds 20 μm/s, another phase transition of L→γ+Ti5Si3 also happens. With increase of growth rate, the steady--state growth microstructure changes from coarse cells to fine cells, to cellular dendrites and then to dendrites. The Ti5Si3 phase stabilizing $\alpha$ phase distributes in the α matrix at a low growth rate, and in the solidified γ matrix at a relatively high growth rate, which is unfavorable in seeding. When the growth rate is 10 μm/s, the distance needed to reach steady--state region becomes shorter, which is favourable in seeding for the present alloy.
STRUCTURE EVOLUTION OF DIRECTIONALLY SOLIDIFIED Ti--43Al--3Si ALLOY I. Microstructure Evolution in the Transition Region

FAN Jianglei,LI Xinzhong,GUO Jingjie,SU Yanqing,FU Hengzhi,

金属学报 , 2009,
Abstract: Ti--43Al--3Si (atomic fraction, %) alloys, seeding material used in preparation of TiAl base alloy, were prepared by directional solidification with growth rate range of 3---100 μm/s. The influences of growth rate on interfacial morphology and microstructure evolution in transition region were studied. Cellular growth appears in a wide range of growth rate of 3---60 μm/s, and the cellular spacing decreases with increase of growth rate. When growth rate is 90 μm/s, a dendritic growth is observed. During the initial solidification, a thermal transition region can be observed clearly. The distribution of Ti5Si3 phase along transition region and relevance of microstructures between the transition region and directional solidification region have obvious effects on the seeding. When the growth rate is lower than 10 μm/s, a good distribution of Ti5Si3 phase and a good relevance appear, which is favourable in seeding for the present alloy.
Molecular dynamics simulation of ion transportationthrough graphene nanochannels
Chen Chen, , Chen Yunfei, , Sha Jingjie, , Wu Gensheng, Ma Jian, , Li Kun, , Ji Anping
- , 2017, DOI: 10.3969/j.issn.1003-7985.2017.02.008
Abstract: The model of ion transportation through graphene nanochannels is established by the molecular dynamics simulation method. Statistics of the electric potential and charge distribution are made, respectively, on both sides of graphene nanopore with various diameters. Then, their changing relationship with respect to the nanopore diameter is determined. When applying a uniform electric field, polar water molecules are rearranged so that the corresponding relationship between the polarized degree of these molecules and the nanopore diameter can be created. Based on the theoretical model of ion transportation through nanochannels, the changing relationship between the concentration of anions/cations in nanochannels and bulk solution concentration is quantitatively analyzed. The results show that the increase of potential drop and charge accumulation, as well as a more obvious water polarization, will occur with the decrease of nanopore diameter. In addition, hydrogen ion concentration has a large proportion in nanochannels with a sodium chloride(NaCl)solution at a relative low concentration. As the NaCl concentration increases, the concentration appreciation of sodium ions tends to be far greater than the concentration drop of chloride ions. Therefore, sodium ion concentration makes more contribution to ionic conductance.
Transcriptome Sequencing and De Novo Analysis for Yesso Scallop (Patinopecten yessoensis) Using 454 GS FLX
Rui Hou, Zhenmin Bao, Shan Wang, Hailin Su, Yan Li, Huixia Du, Jingjie Hu, Shi Wang, Xiaoli Hu
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0021560
Abstract: Background Bivalves comprise 30,000 extant species, constituting the second largest group of mollusks. However, limited genetic research has focused on this group of animals so far, which is, in part, due to the lack of genomic resources. The advent of high-throughput sequencing technologies enables generation of genomic resources in a short time and at a minimal cost, and therefore provides a turning point for bivalve research. In the present study, we performed de novo transcriptome sequencing to first produce a comprehensive expressed sequence tag (EST) dataset for the Yesso scallop (Patinopecten yessoensis). Results In a single 454 sequencing run, 805,330 reads were produced and then assembled into 32,590 contigs, with about six-fold sequencing coverage. A total of 25,237 unique protein-coding genes were identified from a variety of developmental stages and adult tissues based on sequence similarities with known proteins. As determined by GO annotation and KEGG pathway mapping, functional annotation of the unigenes recovered diverse biological functions and processes. Transcripts putatively involved in growth, reproduction and stress/immune-response were identified. More than 49,000 single nucleotide polymorphisms (SNPs) and 2,700 simple sequence repeats (SSRs) were also detected. Conclusion Our data provide the most comprehensive transcriptomic resource currently available for P. yessoensis. Candidate genes potentially involved in growth, reproduction, and stress/immunity-response were identified, and are worthy of further investigation. A large number of SNPs and SSRs were also identified and ready for marker development. This resource should lay an important foundation for future genetic or genomic studies on this species.
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