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227篇 您的检索式:作者名="SUN JianFeng"
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1Preliminary Scientific Results of Chang'E-1 Lunar Orbiter:Based on Payloads Detection Data in the First Phase显示文摘Chang'E-1 lunar Orbiter was launched by Long March 3A rocket from Xichang Satel-lite Launch Center at 18:05BT(Beijing Time) Oct.24,2007.It is the first step of its ambitious three-stage moon program,a new milestone in the Chinese space exploration history.The primary science objectives of Chang'E-1 lunar orbiter are to obtain three-Dimension(3D) stereo images of the lunar surface,to analyze the distribution and abundance of elements on the surface,to investigate the thickness of lunar soil,evaluate helium-3 resources and other characteristics,and to detect the space environment around the moon.To achieve the above four mission objectives,eight sets of scientific instruments are chosen as the payloads of the lunar orbiter,including a CCD stereo camera(CCD),a Sagnac-based interferometer spectrometer(ⅡM),a Laser Altimeter(LAM),a Microwave Radiometer(MRM),a Gamma-Ray Spectrometer(GRS),an X-ray spectrometer(XRS),a High-Energy Particle Detector(HPD),and two Solar Wind Ion Detectors(SWID).The detected data of the payloads show that all payloads work well.This paper introduces the status of payloads in the first phase and preliminary scientific results.OUYANG Ziyuan JIANG Jingshan LI Chunlai SUN Huixian ZOU Yongliao LIU Jianzhong LIU Jianjun ZHAO Baochang REN Xin YANG Jianfeng ZHANG Wenxi WANG Jianyu MOU Lingli CHANG Jin ZHANG Liyan WANG Huanyu LI Yongquan ZHANG Xiaohui ZHENG Yongchun WANG Shijin BIAN Wei 2008空间科学学报2008,28,5:24
2Low C/N_0 Carrier Tracking Loop Based on Optimal Estimation Algorithm in GPS Software Receivers显示文摘Suppressing jitter noises in a phase locked loop(PLL) is of great importance in order to keep precise and continuous track of global positioning system(GPS) signals characterized by low carrier-to-noise ratio(C/N0).This article proposes and analyzes an improved Kalman-filter-based PLL to process weak carrier signals in GPS software receivers.After reviewing the optimal-bandwidth-based traditional second-order PLL,a Kalman-filter-based estimation algorithm is implemented for the new PLL by decorrelating the model error noises and the measurement noises.Finally,the efficiency of this new Kalman-filter-based PLL is verified by experimental data.Compared to the traditional second-order PLL,this new PLL is in position to make correct estimation of the carrier phase differences and Doppler shifts with less overshoots and noise disturbances and keeps an effective check on the disturbances out of jitter noises in PLL.The results show that during processing normal signals,this improved PLL reduces the standard deviation from 0.010 69 cycle to 0.007 63 cycle,and for weak signal processing,the phase jitter range and the Doppler shifts can be controlled within ±17° and ±5Hz as against ±25° and ±15 Hz by the traditional PLL.Miao Jianfeng Chen Wu Sun Yongrong Liu Jianye 2010Chinese Journal of Aeronautics2010,23,1:18
3Changes in soil microbial biomass and community structure with addition of contrasting types of plant litter in a semiarid grassland ecosystem显示文摘Aims Elevated atmospheric CO_(2)has the potential to enhance the net primary productivity of terrestrial ecosystems.However,the role of soil microorganisms on soil C cycling following this increased available C remains ambiguous.This study was conducted to determine how quality and quantity of plant litter inputs would affect soil microorganisms and consequently C turnover.Methods Soil microbial biomass and community structure,bacterial community-level physiological profile,and CO_(2)emission caused by different substrate C decomposition were investigated using techniques of biological measurements,chemical and stable C isotope analysis,and BIOLOG-ECO microplates in a semiarid grassland ecosystem of northern China in 2006 and 2007 by mixing three contrasting types of plant materials,C_(3)shoot litter(SC_(3)),C_(3)root litter(RC_(3)),and C4 shoot litter(SC4),into the 10-to 20-cm soil layer at rates equivalent to 0(C0),60(C60),120(C120)and 240 g C m2(C240).Important Findings Litter addition significantly enriched soil microbial biomass C and N and resulted in changes in microbial structure.Principal component analysis of microbial structure clearly differentiated among zero addition,C_(3)-plant-derived litter,and C4-plant-derived litter and among shoot-and root-derived litter of C_(3)plants;soilmicroorganismsmainly utilized carbohydrates without litter addition,carboxylic acids with C_(3)-plant-derived litter addition and amino acidswith C4-plant-derived litter addition.We also detected stimulated decomposition of older substratewith C4-plant-derived litter inputs.Our results showthat both quality and quantity of belowground litter are involved in affecting soil microbial community structure in semiarid grassland ecosystem.Hongmei Jin Osbert Jianxin Sun Jianfeng Liu 2010Journal of Plant Ecology2010,3,3:18
4Review on Stress Corrosion and Corrosion Fatigue Failure of Centrifugal Compressor Impeller显示文摘Corrosion failure,especially stress corrosion cracking and corrosion fatigue,is the main cause of centrifugal compressor impeller failure.And it is concealed and destructive.This paper summarizes the main theories of stress corrosion cracking and corrosion fatigue and its latest developments,and it also points out that existing stress corrosion cracking theories can be reduced to the anodic dissolution(AD),the hydrogen-induced cracking(HIC),and the combined AD and HIC mechanisms.The corrosion behavior and the mechanism of corrosion fatigue in the crack propagation stage are similar to stress corrosion cracking.The effects of stress ratio,loading frequency,and corrosive medium on the corrosion fatigue crack propagation rate are analyzed and summarized.The corrosion behavior and the mechanism of stress corrosion cracking and corrosion fatigue in corrosive environments,which contain sulfide,chlorides,and carbonate,are analyzed.The working environments of the centrifugal compressor impeller show the behavior and the mechanism of stress corrosion cracking and corrosion fatigue in different corrosive environments.The current research methods for centrifugal compressor impeller corrosion failure are analyzed.Physical analysis,numerical simulation,and the fluid-structure interaction method play an increasingly important role in the research on impeller deformation and stress distribution caused by the joint action of aerodynamic load and centrifugal load.SUN Jiao CHEN Songying QU Yanpeng LI Jianfeng 2015Chinese Journal of Mechanical Engineering2015,28,2:14
5Mobility Analysis of the Deployable Structure of SLE Based on Screw Theory显示文摘Scissor-like element has a number of applications in deployable structures such as planar deployable structure (PDS) and ring deployable structure(RDS). However, the mobility analysis of the multi-loop deployable structures is made more difficulty by the traditional mobility formula, because the deployable structure is a very complex structure with multi-loop. Therefore, On the basis of screw theory, the calculation method of mobility of deployable structures of SLE is thoroughly discussed. In order to investigate the mobility, decomposing and composing structures(DCS) are developed, and the basic units are able to be obtained. On the basis of the deployable structures' geometrical characteristics, there exists a closed-loop quadrilateral structure and some non-closed-loop quadrilateral structures in PDS. Also, a six legs parallel structure is present in RDS. The basic units' mobility can be solved by both the methods of screw theory and topology constraint graphs. Then, composing the related basic units, the formula of planar deployable structures' mobility can be built and solves the mobility of ring deployable structure. The analysis method solves the mobility analysis of the multi-loop deployable structures which is difficulty by the traditional method, and plays an important role in further research about the mobility of other complex deployable structures.SUN Yuantao WANG Sanmin LI Jianfeng ZHI Changjian 2013Chinese Journal of Mechanical Engineering2013,26,4:14
6Meta-analysis and its application in global change research显示文摘Meta-analysis is a quantitative synthetic research method that statistically integrates results from in- dividual studies to find common trends and differences. With increasing concern over global change, meta-analysis has been rapidly adopted in global change research. Here, we introduce the methodolo- gies, advantages and disadvantages of meta-analysis, and review its application in global climate change research, including the responses of ecosystems to global warming and rising CO2 and O3 concentrations, the effects of land use and management on climate change and the effects of distur- bances on biogeochemistry cycles of ecosystem. Despite limitation and potential misapplication, meta-analysis has been demonstrated to be a much better tool than traditional narrative review in synthesizing results from multiple studies. Several methodological developments for research synthe- sis have not yet been widely used in global climate change researches such as cumulative meta-analysis and sensitivity analysis. It is necessary to update the results of meta-analysis on a given topic at regular intervals by including newly published studies. Emphasis should be put on multi-factor interaction and long-term experiments. There is great potential to apply meta-analysis to global climate change research in China because research and observation networks have been established (e.g. ChinaFlux and CERN), which create the need for combining these data and results to provide support for governments’ decision making on climate change. It is expected that meta-analysis will be widely adopted in future climate change research.LEI XiangDong PENG ChangHui TIAN DaLun SUN JianFeng 2007Chinese Science Bulletin2007,52,3:13
7RS and GIS-based Statistical Analysis of Secondary Geological Disasters after the 2008 Wenchuan Earthquake显示文摘用 RS 和 GIS 工具,这篇文章在 Wenchuan 县,四川省,中华人民共和国以及大规模山崩的特征分析一般地质的特征和结构的带分发特征,泥岩石流动,地震湖,等等,在地震以后在 2008 年 5 月 12 日。基于上述工作,全面室内、室外的研究在有地震,地面,阶层,岩性学,和结构的灾难分发特征和他们的关系上被发射。证据方法的重量被利用到份量上分析并且在地震发生了以后,评估第二等的地质的灾难的空间分发。为第二等的地质的灾难的 3 补救等级从证据的重量的结果被导出,由给补救地震的建议列在后面第二等的灾难。CHEN Jianping LI Jianfeng QIN Xuwen DONG Qingji SUN Yan 2009Acta Geologica Sinica(English Edition)2009,83,4:13
8Early Precambrian tectonothermal events of the North China Craton:Constraints from in situ detrital zircon U-Pb,Hf and O isotopic compositions in Tietonggou Formation显示文摘Clastic sediments and sedimentary rocks are widely used for understanding the formation and evolution of the continental crust.The Tietonggou Formation outcrops in the Xiaoqinling region at the southern margin of the North China Craton(NCC)and has unconformable contacts with the underlying Taihua Complex and overlying Paleoproterozoic Xiong’er Group.It mainly consists of quartzite and its protoliths are mature terrigenous clastic rocks.On the basis of the ages of the youngest detrital zircons from the quartzites and the ages of the Xiong’er Group,the depositional ages of the protoliths of the Tietonggou Formation were well constrained to 1.91–1.80 Ga.The U-Pb isotopic data of detrital zircons from the Formation show a major age peak at^2.1 Ga,which is consistent with 2.2–2.0 Ga magmatism in the Trans-North China Orogen of the NCC.Taking into account the texctural and compositional maturity of the Tietonggou Formation quartzite,the^2.1 Ga lithologic units in the Trans-North China Orogen are interpreted as the major source of the Tietonggou Formation.The majority of these^2.1 Ga detrital zircons mostly have highδ18O values(>6.5‰)and negativeεHf(t)values(–7.8–0.0),with corresponding Hf model ages significantly older than their crystallization ages,indicating that these zircons formed from the partial melting of ancient continental crust.The majority of the2.8–2.7 Ga and^2.5 Ga detrital zircons from the Tietonggou Formation had positiveεHf(t)values,and mantle-likeδ18O values,suggesting that the NCC has experienced two stages of significant crustal growth in the Neoarchaean at 2.7 and 2.5 Ga,respectively.The Hf isotopic data of detrital zircons from Paleoproterozoic metasedimentary rocks in the Trans-North China Orogen varied mainly toward the reduction of the radiogenic Hf isotope and gradually show a similar trend of the isotope trajectories of crustal evolution.This reveals that the NCC probably has not developed a long-lived subduction to complete the final assembly of the NCC.Alternatively,these maybe imply that the tectonic setting of the NCC substantially changed at^2.1 Ga,the reduction of the radiogenic Hf isotope could be attributed to the rollback of the subducting slab.DIWU ChunRong SUN Yong GAO JianFeng FAN LongGang 2013Chinese Science Bulletin2013,58,31:11
9Performance of the Prostate Health Index in predicting prostate biopsy outcomes among men with a negative digital rectal examination and transrectal ultrasonography显示文摘[-2]proPSA (p2PSA ) 和它的衍生物, p2PSA-to-free PSA 比率(% p2PSA ) ,和前列腺健康索引(PHI ) 极大地在前列腺活体检视有或没有前列腺癌症(PCa ) 改进了在人之间的辨别。然而,很少在数字直肠的考试(DRE ) 和 transrectal ultrasonography (TRUS ) 是否定的情况中对他们的表演被知道。在有否定 DRE 和 TRUS 的中国的 261 个连续病人的一个未来的队被招募并且经历前列腺活体检视。在活体检视被用来测量各种各样的 PSA 衍生物以前,一件浆液样品收集了,包括总数前列腺特定的抗原(tPSA ) ,免费 PSA,和 p2PSA。为每个病人, free-to-total PSA 比率(% fPSA ) , PSA 密度(PSAD ) , p2PSA-to-free PSA 比率(% p2PSA ) ,和 PHI 是计算的。歧视的性能在在 91% 敏感操作典型曲线(AUC ) 和活体检视率的接收装置下面用区域被估计。在关于年龄, tPSA, % fPSA, PSAD, p2PSA, % p2PSA,和 PHI 的全部队以内的 AUC 分数分别地是 0.598, 0.751, 0.646, 0.789, 0.814, 0.808,和 0.853。PHI 是前列腺活体检视结果的最好的预言者,特别在有 10.1-20 ng ml −1 的 tPSA 的病人。与另外的标记相比,在 91% 的敏感, PHI 为决定哪个人不需要经历活体检视是最有用的,从而避免不必要的过程。PHI 的使用能由在中国与否定 DRE 和 TRUS 在人之中预言前列腺活体检视结果改进 PCa 察觉的精确性。Guo-Peng Yu Rong Na Ding-Wei Ye Jun Qi Fang Liu Hai-Tao Chen Yi-Shuo Wu Gui-Ming Zhang Jie-Lin Sun Yao Zhu Li-Qun Huang Shan-Cheng Ren De-Ke Jiang S Lilly Zheng Hao-WenJiang Ying-Hao Sun Qiang Ding Jianfeng Xu 2016Asian Journal of Andrology2016,18,4:10
10Impact of urban expansion on meteorological observation data and overestimation to regional air temperature in China显示文摘自从改革的实现并且在 1970 年代末在中国开创政策,一些气象学的车站由于城市的扩大消极地进入了城市。在在车站附近的表面和开发环境的变化影响了空气温度的观察。当来自城市的车站的观察数据在公民或地区性的规模空气温度数据集的插值被使用时,他们能导致地区性的空气温度的 overestimation 和对温暖的不精密的评价。在这研究,越过中国包围 756 个气象学的车站的内在的表面在很多时间间隔上基于遥感图象被识别区分进入了城市的农村车站。在把观察数据从被城市的扩大影响了的这些车站移开以后,然后,背景空气温度的数据集被插入内推产生从仍然保持农村的观察数据驻扎。吝啬的城市的热岛效果紧张自从 1970 被从城市的车站把原来的观察记录与背景空气作比较估计,温度插入内推。结果证明那城市的热岛效果确实由于城市的扩大发生,与在比在另外的季节的冬季的更高的紧张。然后,地区性的空气温度的 overestimation 被比较分别地由所有车站和农村车站被插入内推的空气温度的二种格子数据集评估观察数据。空间地, overestimation 比在中国的中央部分在东方中国是相对更高的;然而,两个区域比的展出高得多的效果在西方的中国被观察。我们在最后 40 年里结束了那在中国的温度增加了大约 1.58 的平均数,降水,浅地面温度和 NDVI,哪个 3 吗??SHAO Quanqin SUN Chaoyang LIU Jiyuan HE Jianfeng KUANG wenhui TAO Fulu 2011Journal of Geographical Sciences2011,21,6:10
11miR-210 over-expression enhances mesenchymal stem cell survival in an oxidative stress environment through antioxidation and c-Met pathway activation显示文摘microRNA-210(miR-210)has generally been reported to be associated with cell survival under hypoxia.However,there are few data regarding the role of miR-210 in the survival of mesenchymal stem cells(MSCs)under oxidative stress conditions.Thus,we sought to investigate whether miR-210 over-expression could protect MSCs against oxidative stress injury and what the primary mechanisms involved are.The results showed that over-expression of miR-210 significantly reduced the apoptosis of MSCs under oxidative stress,accompanied by obvious increases in cell viability and superoxide dismutase activity and remarkable decreases in malonaldehyde content and reactive oxygen species production,resulting in a noticeable reduction of apoptotic indices when compared with the control.Moreover,the above beneficial effects of miR-210 could be significantly reduced by c-Met pathway repression.Collectively,these results showed that miR-210 over-expression improved MSC survival under oxidative stress through antioxidation and c-Met pathway activation,indicating the potential development of a novel approach to enhance the efficacy of MSC-based therapy for injured myocardium.XU JianFeng HUANG ZheYong LIN Li FU MingQiang GAO YanHua SHEN YunLi ZOU YunZeng SUN AiJun QIAN JuYing GE JunBo 2014Science China(Life Sciences)2014,57,10:10
12DEM Modeling of Particle Breakage in Silica Sands under One-Dimensional Compression显示文摘A Discrete Element Method(DEM) model is developed to study the particle breakage effect on the one-dimensional compression behavior of silica sands. The ‘maximum tensile stress' breakage criterion considering multiple contacts is adopted to simulate the crushing of circular particles in the DEM. The model is compared with published experimental results. Comparison between the compression curves obtained from the numerical and experimental results shows that the proposed method is very effective in studying the compression behavior of silica sands considering particle breakage. The evolution of compression curves at different stress levels is extensively studied using contact force distribution, variation of contact number and particle size distribution curve with loading. It is found that particle breakage has great impact on compression behavior of sand, particularly after the yield stress is reached and particle breakage starts.The crushing probability of particles is found to be macroscopically affected by stress level and particle size distribution curve, and microscopically related to the evolutions of contact force and coordination number. Once the soil becomes well-graded and the average coordination number is greater than 4 in two-dimension, the crushing probability of parent particles can reduce by up to5/6. It is found that the average contact force does not always increase with loading, but increases to a peak value then decreases once the soil becomes more well-graded. It is found through the loading rate sensitivity analysis that the compression behavior of sand samples in the DEM is also affected by the loading rate. Higher yield stresses are obtained at higher loading rates.Danda Shi Lin Zheng Jianfeng Xue Jing Sun 2016Acta Mechanica Solida Sinica2016,29,1:9
13Recent Progress in Distributed Optical Fiber Raman Photon Sensors at China Jiliang University显示文摘在在中国 Jiliang 大学(CJLU ) 的完整的分布式的纤维拉曼光子传感器的研究,生产和应用的最近的进步的简短评论被介绍。以便改进测量距离,精确性,空间分辨率,多参数大小的能力,和完整的分布式的纤维传感器系统的智力,一种新一代纤维传感器技术基于光纤维,非线性的散布熔化原则被建议。一系列新一代完整的分布式的纤维传感器被调查并且设计,它由新产生组成极端长的距离散布与一个纤维拉曼放大器综合的光子传感器的完整的分布式的纤维拉曼和瑞利,汽车修正完整的分布式的纤维拉曼光子温度传感器基于拉曼关联双来源,完整的分布式的纤维拉曼光子温度传感器基于编码的脉搏采购原料,完整的分布式的纤维拉曼光子温度传感器Zaixuan ZHANG 2012Photonic Sensors2012,2,2:8
14Bile acids evoke placental inflammation by activating Gpbar1/NF-κB pathway in intrahepatic cholestasis of pregnancy显示文摘Intrahepatic cholestasis of pregnancy(ICP)is a cholestatic disorder with potentially deleterious consequences for fetuses.Although a clear correlation between the elevated levels of maternal serum bile acids and deficient fetal outcome has been established in clinical practice,the underlying mechanisms remain elusive.Herein,we report that bile acids induce NF-κB pathway activation via G protein-coupled bile acid receptor 1(Gpbar1),with consequent upregulation of inflammatory genes in trophoblasts,leading to aberrant leukocyte infiltration and inflammation in placenta.Ursodeoxycholic acid(UDCA),a drug used clinically to treat ICP,competes with other bile acids for binding with Gpbar1 and thus inhibits bile acid-induced inflammatory response in trophoblasts and improves fetal survival in pregnant rats with obstructive cholestasis.Notably,inhibition of NF-κB by andrographolide is more effective than UDCA in benefiting placentas and fetuses.Thus,anti-inflammation therapy targeting Gpbar1/NF-κB pathway could be effective in suppressing bile acid-induced inflammation and alleviating ICP-associated fetal disorders.YouHua Zhang YouDong Pan ChangDong Lin YaJuan Zheng Hao Sun HaiLong Zhang JunLei Wang MengYa Yuan Tao Duan QiaoLing Du JianFeng Chen 2016Journal of Molecular Cell Biology2016,8,6:8
15A cyclodextrin-based nanoformulation achieves co-delivery of ginsenoside Rg3 and quercetin for chemo-immunotherapy in colorectal cancer显示文摘The immune checkpoint blockade therapy has profoundly revolutionized the field of cancer immunotherapy. However, despite great promise for a variety of cancers, the efficacy of immune checkpoint inhibitors is still low in colorectal cancer(CRC). This is mainly due to the immunosuppressive feature of the tumor microenvironment(TME). Emerging evidence reveals that certain chemotherapeutic drugs induce immunogenic cell death(ICD), demonstrating great potential for remodeling the immunosuppressive TME. In this study, the potential of ginsenoside Rg3(Rg3) as an ICD inducer against CRC cells was confirmed using in vitro and in vivo experimental approaches. The ICD efficacy of Rg3 could be significantly enhanced by quercetin(QTN) that elicited reactive oxygen species(ROS). To amelioratein vivo delivery barriers associated with chemotherapeutic drugs, a folate(FA)-targeted polyethylene glycol(PEG)-modified amphiphilic cyclodextrin nanoparticle(NP) was developed for co-encapsulation of Rg3 and QTN. The resultant nanoformulation(CD-PEG-FA.Rg3.QTN) significantly prolonged blood circulation and enhanced tumor targeting in an orthotopic CRC mouse model, resulting in the conversion of immunosuppressive TME. Furthermore, the CD-PEG-FA.Rg3.QTN achieved significantly longer survival of animals in combination with Anti-PD-L1. The study provides a promising strategy for the treatment of CRC.Dandan Sun Yifang Zou Liu Song Shulan Han Hao Yang Di Chu Yun Dai Jie Ma Caitriona M.O’Driscoll Zhuo Yu Jianfeng Guo 2022Acta Pharmaceutica Sinica B2022,12,1:8
16Basic fibroblast growth factor attenuates the degeneration of injured spinal cord motor endplates显示文摘The distal end of the spinal cord and neuromuscular junction may develop secondary degeneration and damage following spinal cord injury because of the loss of neural connections. In this study, a rat model of spinal cord injury, established using a modified Allen's method, was injected with basic fibroblast growth factor solution via subarachnoid catheter. After injection, rats with spinal cord injury displayed higher scores on the Basso, Beattie and Bresnahan locomotor scale. Motor function was also well recovered and hematoxylin-eosin staining showed that spinal glial scar hyperplasia was not apparent. Additionally, anterior tibial muscle fibers slowly, but progressively, atrophied. Immunohistochemical staining showed that the absorbance values of calcitonin gene related peptide and acetylcholinesterase in anterior tibial muscle and spinal cord were similar, and injection of basic fibroblast growth factor increased this absorbance. Results showed that after spinal cord injury, the distal motor neurons and motor endplate degenerated. Changes in calcitonin gene related peptide and acetylcholinesterase in the spinal cord anterior horn motor neurons and motor endplate then occurred that were consistent with this regeneration. Our findings indicate that basic fibroblast growth factor can protect the endplate through attenuating the decreased expression of calcitonin gene related peptide and acetylcholinesterase in anterior horn motor neurons of the injured spinal cord.Jianlong Wang Jianfeng Sun Yongxiang Tang Gangwen Guo Xiaozhe Zhou Yanliang Chen Minren Shen 2013Neural Regeneration Research2013,8,24:7
17Neural stem cell transplantation in a double-layer collagen membrane with unequal pore sizes for spinal cord injury repair显示文摘A novel double-layer collagen membrane with unequal pore sizes in each layer was designed and tested in this study.The inner,loose layer has about 100-μm-diameter pores,while the outer,compact layer has about 10-μm-diameter pores.In a rat model of incomplete spinal cord injury,a large number of neural stem cells were seeded into the loose layer,which was then adhered to the injured side,and the compact layer was placed against the lateral side.The results showed that the transplantation of neural stem cells in a double-layer collagen membrane with unequal pore sizes promoted the differentiation of neural stem cells,attenuated the pathological lesion,and significantly improved the motor function of the rats with incomplete spinal cord injuries.These experimental findings suggest that the transplantation of neural stem cells in a double-layer collagen membrane with unequal pore sizes is an effective therapeutic strategy to repair an injured spinal cord.Ning Yuan Wei Tian Lei Sun Runying Yuan Jianfeng Tao Dafu Chen 2014Neural Regeneration Research2014,9,10:7
18Trace bis-(3-sulfopropyl)-disulfide enhanced electrodeposited copper foils显示文摘Smooth and strong copper foils are highly required for the development of printed circuit boards and Li-ion batteries.Adding additives is an efficient and low-cost method to enhance electrodeposited copper foils.Here we chose Bis-(3-sulfopropyl)-disulfide(SPS)as the additive and investigated its concentration on the surface roughness and tensile strength of the electrodeposited copper foils.A copper foil with the smoothest surface(Rz=2.1μm)and the highest tensile strength(~338 MPa)was prepared with1.5 mg/L SPS.The contact angle on the copper foil decreased with the reduction of surface roughness.The enhancing mechanism of the SPS was investigated by scanning electron microscopy and X-ray diffraction.The refined grain and enhanced(220)texture were considered to be the radical reason for the smooth and strong copper foils.The electrochemical results prove the suppressing effect is related to the SPS adsorption.Lingling Liu Yeqiang Bu Yue Sun Jianfeng Pan Jiabin Liu Jien Ma Lin Qiu Youtong Fang 2021Journal of Materials Science & Technology2021,,15:6
19Phi-based risk calculators performed better in the prediction of prostate cancer in the Chinese population显示文摘Risk prediction models including the Prostate Health Index(phi)for prostate cancer have been well established and evaluated in the Western population.The aim of this study is to build phi-based risk calculators in a prostate biopsy population and evaluate their performanee in predicting prostate cancer(PCa)and high-grade PCa(Gleason score 27)in the Chinese population.We developed risk calculators based on 635 men who underwent initial prostate biopsy.Then,we validated the performance of prostate-specific antigen(PSA),phi,and the risk calculators in an additional observational cohort of 1045 men.We observed that the phi-based risk calculators(risk calculators 2 and 4)outperformed the PSA-based risk calculator for predicting PCa and high-grade PCa in the training cohort.In the validation study,the area under the receiver operating characteristic curve(AUC)for risk calculators 2 and 4 reached 0.91 and 0.92,respectively,for predicting PCa and high-grade PCa,respectively;the AUC values were better than those for risk calculator 1(PSA-based model with an AUC of 0.81 and 0.82,respectively)(all P<0.001).Such superiority was also observed in the stratified population with PSA ranging from 2.0 ng ml^-1 to 10.0 ng ml^-1.Decision curves confirmed that a considerable proportion of unnecessary biopsies could be avoided while applying phi-based risk calculators.In this study,we showed that,compared to risk calculators without phi,phi-based risk calculators exhibited superior discrimination and calibration for PCa in the Chinese biopsy population.Applying these risk calculators also considerably reduced the number of unnecessary biopsies for PCa.Yi-Shuo Wu Xiao-Jian Fu Rong Na Ding-Wei Ye Jun Qi Xiao-Ling Lin Fang Liu Jian Gong Ning Zhang Guang-Liang Jiang Hao-Wen Jiang Qiang Ding Jianfeng Xu Ying-Hao Sun 2019Asian Journal of Andrology2019,21,6:6
20Simultaneous Removal of H_2S and Organosulfur Compounds from Liquefied Petroleum Gas Using Formulated Solvents: Solubility Parameter Investigation and Industrial Test显示文摘The performance of four formulated solvents(labeled as UDS-I, UDS-II, UDS-III, and UDS-IV) for removing methyl mercaptan from liquefied petroleum gas was predicted based on a two-dimensional solubility parameter theory. The calculation results show that UDS-IV has the closest solubility parameter to that of methyl mercaptan as compared with other tested solvents, indicating the strongest affinity and the highest solubility for methyl mercaptan. The industrial tests at a plant for desulfurization of LPG produced from the delayed coker have shown that the UDS solvents have the excellent performance for removal of organosulfur compounds(mainly methyl mercaptan). Although the sulfur loading dramatically increases, the total sulfur content of LPG treated with UDS-IV can be reduced by about 50% in comparison with N-methyl diethanolamine. In addition, UDS-IV has superior regeneration performance and selectivity for sulfur compounds over hydrocarbons. The industrial test and the solubility parameter calculation results are in good agreement with each other.Zhang Feng Shen Benxian Sun Hui Liu Jichang Shang Jianfeng 2015China Petroleum Processing & Petrochemical Technology2015,17,1:6
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