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    题名 作者 年代 出处 被引量
1Moment-independent importance measure of basic random variable and its probability density evolution solution显示文摘To analyze the effect of basic variable on failure probability in reliability analysis,a moment-independent importance measure of the basic random variable is proposed,and its properties are analyzed and verified.Based on this work,the importance measure of the basic variable on the failure probability is compared with that on the distribution density of the response.By use of the probability density evolution method,a solution is established to solve two importance measures,which can efficiently avoid the difficulty in solving the importance measures.Some numerical examples and engineering examples are used to demonstrate the proposed importance measure on the failure probability and that on the distribution density of the response.The results show that the proposed importance measure can effectively describe the effect of the basic variable on the failure probability from the distribution density of the basic variable.Additionally,the results show that the established solution on the probability density evolution is efficient for the importance measures.CUI LiJie,Lü ZhenZhou & ZHAO XinPan School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China 2010Science China(Technological Sciences)2010,53,4:41
2FLOOD DISCHARGE AND ENERGY DISSIPATION BY JETS FROM OUTLETS IN HIGH ARCH DAM显示文摘In this thesis, the scale effect by an aerated water jet diffusing in the water upon the hydrodynamic pressure, the local riverbed scour by multiple layered jets and by those colliding in the vertical and the transverse directions, and the stability of the apron slab both in the inverted arch cushion pool and the flat bottom one by the large discharge and the high water head with 300m level are detailedly researched by means of model test and numerical simulation. A mathematic model simulating the destabilization of the flat bottomed slab is established to open out the mechanism of its stability. Both experimental researches both on the hydrodynamic pressure acted inside joints between the bedrock and the apron slab, and on forces at arch abutments in inverted arch cushion pool are carried out by using an advanced measurement and the imitation means to acquire the mechanism of the inverted arch pool to keep stability and its stability condition.Ph.D.Candidate:Sun JianXi’an University of Technolgy, Xi’an 710048, ChinaSupervisor:Yu Changzhao (Tsinghua University, Beijing 100084, China)Li Yuzhu (Tsinghua University, Beijing 100084, China)Chen Changzhi (Tsinghua University, Beijing 100084, China)Members of Dissertation Defense Committee:Gao Jizhang (China Institute of Water Resources and Hydropower Research), ChairmanLi Guifen (China Institute of Water Resources and Hydropower Research)Cui Guangtao (Tianjing University)Wang Xingkui (Tsinghua University)Yu Changzhao (Tsinghua University)Li Yuzhu (Tsinghua University)Chen Changzhi (Tsinghua University) 2003Journal of Hydrodynamics2003,15,1:39
3Precise nanomedicine for intelligent therapy of cancer显示文摘Precise nanomedicine has been extensively explored for efficient cancer imaging and targeted cancer therapy, as evidenced by a few breakthroughs in their preclinical and clinical explorations. Here, we demonstrate the recent advances of intelligent cancer nanomedicine, and discuss the comprehensive understanding of their structure-function relationship for smart and efficient cancer nanomedicine including various imaging and therapeutic applications, as well as nanotoxicity. In particular, a few emerging strategies that have advanced cancer nanomedicine are also highlighted as the emerging focus such as tumor imprisonment, supramolecular chemotherapy, and DNA nanorobot. The challenge and outlook of some scientific and engineering issues are also discussed in future development. We wish to highlight these new progress of precise nanomedicine with the ultimate goal to inspire more successful explorations of intelligent nanoparticles for future clinical translations.Huabing Chen Zhanjun Gu Hongwei An Chunying Chen Jie Chen Ran Cui Siqin Chen Weihai Chen Xuesi Chen Xiaoyuan Chen Zhuo Chen Baoquan Ding Qian Dong Qin Fan Ting Fu Dayong Hou Qiao Jiang Hengte Ke Xiqun Jiang Gang Liu Suping Li Tianyu Li Zhuang Liu Guangjun Nie Muhammad Ovais Daiwen Pang Nasha Qiu Youqing Shen Huayu Tian Chao Wang Hao Wang Ziqi Wang Huaping Xu Jiang-Fei Xu Xiangliang Yang Shuang Zhu Xianchuang Zheng Xianzheng Zhang Yanbing Zhao Weihong Tan Xi Zhang Yuliang Zhao 2018Science China Chemistry2018,61,12:19
4Soil Bacterial Communities Under Different Long-Term Fertilization Regimes in Three Locations Across the Black Soil Region of Northeast China显示文摘Although soil bacteria play critical roles in agro-ecosystems, the knowledge of their response to long-term fertilization across the black soil region of Northeast China is limited. In this study, we sequenced 16 S rRNA genes to assess the effects of four long-term fertilization regimes—non-fertilization(NoF), chemical fertilizer(CF), manure(M), and chemical fertilizer plus manure(CFM)—on soil properties and bacterial communities in three locations, the northern, middle, and southern parts, across the black soil region. Results showed that the influence of fertilization regimes on soil properties varied significantly among the three locations. Manure fertilization significantly increased microbial biomass carbon and relative abundance of copiotrophic bacteria. Principal component analysis(PCA)showed that the total bacterial communities were separated into three groups according to the sampling location despite long-term fertilization, and that soil pH was the most important factor in shifting bacterial communities. In addition, similar fertilization regimes resulted in different influences on bacterial community composition, and the most influential soil properties varied among the three locations. Our results highlighted that geographical separation was a more dominant factor affecting bacterial communities than fertilization, and that long-term similar fertilization regimes did not induce consistent changes in bacterial community composition in the black soil region.HU Xiaojing LIU Junjie WEI Dan ZHU Ping CUI Xi'an ZHOU Baoku CHEN Xueli JIN Jian LIU Xiaobing WANG Guanghua 2018Pedosphere2018,28,5:17
5Distinct characteristics and new prognostic scoring system for Chinese patients with Waldenstr(o)m macroglobulinemia显示文摘Yi Shuhua Cui Rui Li Zengjun An Gang Qi Junyuan Zou Dehui Zhang Peihong Chen Huishu Wang Jianxiang Chang Hong Qiu Lugui 2014Chinese Medical Journal2014,,12:12
6A cross-sectional study on HGV infection in a rural population显示文摘AbstractAIMTodeterminetheepidemiologicalcharacteristicsandclinicalsignificanceofHGVinfection,andtocomparewithHBVandHCVinfecti...LING Bin Hua 1, ZHUANG Hui 1, CUI Yi Hui 1, AN Wen Feng 1, LI Zhi Jie 1, WANG Shu Ping 2 and ZHU Wan Fu 2 1998World Journal of Gastroenterology1998,4,6:10
7Proteomic analysis of mitochondria reveals a metabolic switch from fatty acid oxidation to glycolysis in the failing heart显示文摘This work characterizes the mitochondrial proteomic profile in the failing heart and elucidates the molecular basis of mitochondria in heart failure. Heart failure was induced in rats by myocardial infarction, and mitochondria were isolated from hearts by differential centrifugation. Using two-dimensional gel electrophoresis and matrix-assisted laser desorption/ionization-time of flight mass spectrometry, a system biology approach was employed to investigate differences in mitochondrial proteins between normal and failing hearts. Mass spectrometry identified 27 proteins differentially expressed that involved in energy metabolism. Among those, the up-regulated proteins included tricarboxylic acid cycle enzymes and pyruvate dehydrogenase complex subunits while the down-regulated proteins were involved in fatty acid oxidation and the OXPHOS complex. These results suggest a substantial metabolic switch from free fatty acid oxidation to glycolysis in heart failure and provide molecular evidence for alterations in the structural and functional parameters of mitochondria that may contribute to cardiac dysfunction during ischemic injury.WANG Jun1,2, BAI Ling1,2, LI Jing3, SUN ChaoFeng1,2, ZHAO Jin1, CUI ChangCong1,2, HAN Ke1,2, LIU Yu1,2, ZHUO XiaoZhen1,2, WANG TingZhong1,2, LIU Ping1,2, FAN FenLing1,2, GUAN YouFei3 & MA AiQun1,2 1 Department of Cardiology, First affiliated hospital of medical college of Xi’an Jiaotong University, Xi’an 710061, China 2 Ion Channel Disease Laboratory, Key Laboratory of Environment and Genes Related to Diseases of Education Ministry, Xi’an 710061, China 3 Department of Physiology and Pathophysiology Key Laboratory of Molecular Cardiovascular Sciences of the Ministry of Education, Peking University Health Science Center, Beijing 100083, China 2009Science China(Life Sciences)2009,52,11:10
8Oncogenic AURKA-enhanced N6-methyladenosine modification increases DROSHA mRNA stability to transactivate STC1 in breast cancer stem-like cells显示文摘RNase III DROSHA is upregulated in multiple cancers and contributes to tumor progression by hitherto unclear mechanisms.Here,we demonstrate that DROSHA interacts withβ-Catenin to transactivate STC1 in an RNA cleavage-independent manner,contributing to breast cancer stem-like cell(BCSC)properties.DROSHA mRNA stability is enhanced by N6-methyladenosine(m^(6)A)modification which is activated by AURKA in BCSCs.AURKA stabilizes METTL14 by inhibiting its ubiquitylation and degradation to promote DROSHA mRNA methylation.Moreover,binding of AURKA to DROSHA transcript further strengthens the binding of the m^(6)A reader IGF2BP2 to stabilize m^(6)A-modified DROSHA.In addition,wild-type DROSHA,but not an m^(6)A methylation-deficient mutant,enhances BCSC stemness maintenance,while inhibition of DROSHA m^(6)A modification attenuates BCSC traits.Our study unveils the AURKA-induced oncogenic m^(6)A modification as a key regulator of DROSHA in breast cancer and identifies a novel DROSHA transcriptional function in promoting the BCSC phenotype.Fei Peng Jie Xu Bai Cui Qilan Liang Sai Zeng Bin He Hong Zou Manman Li Huan Zhao Yuting Meng Jin Chen Bing Liu Shasha Lv Peng Chu Fan An Zifeng Wang Junxiu Huang Yajing Zhan Yuwei Liao Jinxin Lu Lingzhi Xu Jin Zhang Zhaolin Su Zhiguang Li Fangjun Wang Eric W-FLam Quentin Liu 2021Cell Research2021,31,3:9
9Promoting ring-opening efficiency for suppressing toxic intermediates during photocatalytic toluene degradation via surface oxygen vacancies显示文摘Aromatic ring-opening process is well recognized as the rate-determining step for catalytic toluene degradation. In photocatalytic toluene degradation, the toxic intermediates w让h harmful effects may be generated. To clarify the precise reaction mechanism and control the toxic intermediates generation, a closely combined in situ DRIFTS and DFT calculation is utilized to address these important issues. We construct the BiOCl w让h oxygen vacancies (OVs) and reveal the structure of OVs. The defect level caused by oxygen vacancies could promote the light adsorption and charge separation, which further boosts the activation of ring-opening species and enhances the generation process of free radicals. The reaction energy barriers of four possible ring-opening processes on defective BiOCl (OVBOC) are all declined in comparison with perfect BiOCl (BOC). The existence of oxygen vacancies could smooth the ratedetermining step so the ring-opening efficiency of photocatalytic toluene degradation is highly increased. Most importantly, the methyl species would be further oxidized and tend to open the benzene-ring at benzoic acid on BOC while the ring would be broken at the benzyl alcohol on OVBOC. These results indicate that the toluene degradation pathway is shortened via the surface OVs, which enables the production of radicals with high oxidation capability for the accelerated chain scission of the ring-opening intermediates. Finally, the efficiency of the key ring-opening process could be enormously improved and toxic intermediates are effectively restrained. The present work could provide new insights into the design of high-performance photocatalysts for efficient and safe degradation of VOCs in air.Xing'an Dong Wen Cui Hong Wang Jieyuan Li Yanjuan Sun Haiqiang Wang Yuxin Zhang Hongwei Huang Fan Dong 2019Science Bulletin2019,64,10:9
10Prevention and control of HIV/AIDS in China:lessons from the past three decades显示文摘In the past 37 years,human immunodeficiency virus/acquired immunodeficiency syndrome(HIV/AIDS)has undergone various major transmission routes in China,with the world most complex co-circulating HIV-1 subtypes,even the prevalence is still low.In response to the first epidemic outbreak of HIV in injecting drug users and the second one by illegal commercial blood collection,China issued the Anti-Drug Law and launched the Blood Donation Act and nationwide nucleic acid testing,which has avoided 98,232 to 211,200 estimated infections and almost ended the blood product-related infection.China has been providing free antiretroviral therapy(ART)since 2003,which covered>80%of the identified patients and achieved a viral suppression rate of 91%.To bend the curve of increasing the disease burden of HIV and finally end the epidemic,China should consider constraining HIV spread through sexual transmission,narrowing the gaps in identifying HIV cases,and the long-term effectiveness and safety of ART in the future.Jun-Jie Xu Meng-Jie Han Yong-Jun Jiang Hai-Bo Ding Xi Li Xiao-Xu Han Fan Lv Qing-Feng Chen Zi-Ning Zhang Hua-Lu Cui Wen-Qing Geng Jing Zhang Qi Wang Jing Kang Xiao-Lin Li Hong Sun Ya-Jing Fu Ming-Hui An Qing-Hai Hu Zhen-Xing Chu Ying-Jie Liu Hong Shang 2021Chinese Medical Journal2021,,23:9
11Partitioning properties of rare earth ores in China显示文摘The properties of rare earth partitioning in Chinese industrial rare earth ores were analyzed. Rare earth ores canbe divided into the single-mineral type ore with bastnaesite, the multi-mineral type ore with bastnaesite and monazite, andthe weathering crust type. Both the Bayan Obo rare earth ore and the Zhushan rare earth ore are a kind of mixed ore, con-sisting of bastnaesite and monazite. Their rare earth partitionings are strongly enriched in light rare earths, where CeO2 is50% and the light rare earth partitioning is totally over 95%. The Mianning rare earth ore as well as the Weishan rare earthis a kind of rare earth ore only having bastnaesite. Their rare earth partitionings are also strongly enriched in light rare earths,in which CeO2 is 47% and the light rare earth partitioning is totally over 94%. For the weathering crust type rare earth ore,there are the Longnan rare earth ore, the Xunwu rare earth ore, and the middle yttrium and rich europium ore. In the Long-nan rare earth ore, which is strongly enriched in heavy rare earths, Y2O3 is 64.83%, and the heavy and light rare earthpartitionings are 89.40% and 10.53%, respectively. In the Xunwu rare earth ore, which is strongly enriched in light rareearths, CeO2 is 47.16%, and the light rare earth partitioning is totally 93.25%. Y and Eu are enriched in the middle yttriumand rich europium ore. Its middle rare earth partitioning is totally over 10%, and Eu2O3 and Y2O3 are over 0.5% and 20%,respectively, which are mainly industrial resources of the middle and the heavy rare earths.CHI Ru 'an LI Zhongjun PENG Cui ZHU Guocai XU Shengming 2005Rare Metals2005,24,3:8
12Analyses of circRNA profiling during the development from pre-receptive to receptive phases in the goat endometrium显示文摘Background: Recent studies have revealed that noncoding RNAs play important regulatory roles in the formation of endometrial receptivity.Circular RNAs(circRNAs) are a universally expressed noncoding RNA species that have been recently proposed to act as miRNA sponges that directly regulate expression of target genes or parental genes.Results: We used Illumina Solexa technology to analyze the expression profiles of circRNAs in the endometrium from three goats at gestational day 5(pre-receptive endometrium,PE) and three goats at gestational day 15(receptive endometrium,RE).Overall,21,813 circRNAs were identified,of which 5,925 circRNAs were specific to the RE and 9,078 were specific to the PE,which suggested high stage-specificity.Further analysis found 334 differentially expressed circRNAs in the RE compared with PE(P < 0.05).The analysis of the circRNA-miRNA interaction network further supported the idea that circRNAs act as miRNA sponges to regulate gene expression.Moreover,some circRNAs were regulated by estrogen(E2)/progesterone(P4) in endometrial epithelium cell lines(EECs) and endometrial stromal cell line(ESCs),and each circRNA molecule exhibited unique regulation characteristics with respect to E2 and P4.Conclusions: These data provide an endometrium circRNA expression atlas corresponding to the biology of the goat receptive endometrium during embryo implantation.Yuxuan Song Lei Zhang Xiaorui Liu Mengxiao Niu Jiuzeng Cui Sicheng Che Yuexia Liu Xiaopeng An Binyun Cao 2019Journal of Animal Science and Biotechnology2019,10,3:8
13Characterization of the essential role of bone morphogenetic protein 9 (BMP9) in osteogenic differentiation of mesenchymal stem cells (MSCs) through RNA interference显示文摘Mesenchymal stem cells(MSCs)are multipotent stem cells and capable of differentiating into multiple cell types including osteoblastic,chondrogenic and adipogenic lineages.We previously identified BMP9 as one of the most potent BMPs that induce osteoblastic differentiation of MSCs although exact molecular mechanism through which BMP9 regulates osteogenic differentiation remains to be fully understood.Here,we seek to develop a recombinant adenovirus system to optimally silence mouse BMP9 and then characterize the important role of BMP9 in osteogenic differentiation of MSCs.Using two different siRNA bioinformatic prediction programs,we design five siRNAs targeting mouse BMP9(or simB9),which are expressed under the control of the converging H1 and U6 promoters in recombinant adenovirus vectors.We demonstrate that two of the five siRNAs,simB9-4 and simB9-7,exhibit the highest efficiency on silencing exogenous mouse BMP9 in MSCs.Furthermore,simB9-4 and simB9-7 act synergistically in inhibiting BMP9-induced expression of osteogenic markers,matrix mineralization and ectopic bone formation from MSCs.Thus,our findings demonstrate the important role of BMP9 in osteogenic differentiation of MSCs.The characterized simB9 siRNAs may be used as an important tool to investigate the molecular mechanism behind BMP9 osteogenic signaling.Our results also indicate that recombinant adenovirus-mediated expression of siRNAs is efficient and sustained,and thus may be used as an effective delivery vehicle of siRNA therapeutics.Shujuan Yan Ruyi Zhang Ke Wu Jing Cui Shifeng Huang Xiaojuan Ji Liping An Chengfu Yuan Cheng Gong Linghuan Zhang Wei Liu Yixiao Feng Bo Zhang Zhengyu Dai Yi Shen Xi Wang Wenping Luo Bo Liu Rex C.Haydon Michael J.Lee Russell R.Reid Jennifer Moriatis Wolf Qiong Shi Hue H.Luu Tong-Chuan He Yaguang Weng 2018Genes & Diseases2018,5,2:8
14Effects of rare earth elements La and Yb on the morphological and functional development of zebrafish embryos显示文摘In recent years,with the wide applications and mineral exploitation of rare earth elements,their potential environmental and health effects have caused increasing public concern.Effect of rare earth elements La and Yb on the morphological and functional development of zebrafish embryos were studied.The embryos were exposed to La3+ or Yb3+ at 0,0.01,0.1,0.3,0.5 and 1.0 mmol/L,respectively.Early life stage parameters such as egg and embryo mortality,gastrula development,tail detachment,eyes,somite formation,circulatory system,pigmentation,malformations,hatching rate,length of larvae and mortality were investigated.The results showed La3+ and Yb3+ delayed zebrafish embryo and larval development,decreased survival and hatching rates,and caused tail malformation in a concentration-dependent way.Moreover,heavy rare-earth ytterbium led to more severe acute toxicity of zebrafish embryo than light rare-earth lanthanum.Jun'an Cui Zhiyong Zhang Wei Bai Ligang Zhang Xiao He Yuhui Ma Yan Liu Zhifang Chai 2012Journal of Environmental Sciences2012,24,2:8
15Mechanism of exogenous nucleic acids and their precursors improving the repair of intestinal epithelium after 7-irradiation in mice显示文摘AIM To clone expressed genes associated withrepair of irradiation-damaged mice intestinalgland cells treated by small intestinal RNA,andto explore the molecular mechanism ofexogenous nucleic acids improving repair ofintestinal crypt.METHODS The animal mode of test group andcontrol group was established,forty-five micebeing irradiated by γ ray were treated with smallintestinal RNA as test group,forty mice beingirradiated by γ ray were treated withphysiological saline as control group,five micewithout irradiation were used as normal control,their jejunal specimens were collectedrespectively at 6h,12h,24h,4d and 8d afterirradiation.Then by using LD-PCR based onsubtractive hybridization,these gene fragmentsdifferentially expressed between test group andcontrol group were obtained,and then werecloned into T vectors as well as beingsequenced.Obtained sequences were screenedagainst.GeneBank,if being new sequences,they were submitted to GeneBank.RESULTS Ninety clones were associated withrepair of irradiation-damaged intestinal glandcells treated by intestinal RNA.These clonesfrom test group of 6h,12h,24h,4d and 8dwere respectively 18,22,25,13,12.By screening against GeneBank,18 of which werenew sequences,the others were dramaticallysimilar to the known sequences,mainly similarto hsp,Nmi,Dutt1,alkaline phosphatase,homeobox,anti-CEA ScFv antibody,arginine/serine kinase and BMP-4,repA.Eighteen genefragments were new sequences,their acceptnumbers in GeneBank were respectivelyAF240164-AF240181.CONCLUSION Ninety clones were obtained tobe associated with repair of irradiation-damagedmice intestinal gland cells treated by smallintestinal RNA,which may be related toabnormal expression of genes and matchedproteins of hsp,Nmi,Duttl,Na,K-ATPase,alkalineph-osphatase,glkA,single strandedreplicative centromeric gene as well as 18 newsequences.Da Xiang Cui~1 Guei Ying Zeng~2 Feng Wang~1 Jun Rong Xu~1 Dong Qing Ren~2 Yan Hai Guo~1 Fu Rong Tian~2 Xiao Jun Yan~1 Yu Hou~1 Cheng Zhi Su~1 1 Institute of Genetic Diagnosis of the Fourth Military Medical University,Xi’an 710032,China 2 Department of Irradiation Medicine of the Fourth Military Medical University,Xi’an 710032,China 2000World Journal of Gastroenterology2000,6,5:8
16Organic photovoltaic cell with 17% efficiency and superior processability显示文摘The development of organic photoactive materials,especially the newly emerging non-fullerene electron acceptors(NFAs),has enabled rapid progress in organic photovoltaic(OPV)cells in recent years.Although the power conversion efficiencies(PCEs)of the top-performance OPV cells have surpassed 16%,the devices are usually fabricated via a spin-coating method and are not suitable for large-area production.Here,we demonstrate that the fine-modification of the flexible side chains of NFAs can yield 17%PCE for OPV cells.More crucially,as the optimal NFA has a suitable solubility and thus a desirable morphology,the high efficiencies of spin-coated devices can be maintained when using scalable blade-coating processing technology.Our results suggest that optimization of the chemical structures of the OPV materials can improve device performance.This has great significance in larger-area production technologies that provide important scientific insights for the commercialization of OPV cells.Yong Cui Huifeng Yao Ling Hong Tao Zhang Yabing Tang Baojun Lin Kaihu Xian Bowei Gao Cunbin An Pengqing Bi Wei Ma Jianhui Hou 2020National Science Review2020,7,7:7
17Retrograde approach for the recanalization of coronary chronic total occlusion: preliminary experience of a single center显示文摘为开运河不戏剧性地有的长期的全部的吸藏(CTO ) 的 antegrade 途径的成功率增加了的背景,特别在复杂 CTO 子集。retrograde 技术可以保持大诺言。这份报告试图描述我们的经验后退为 CTO 的开运河,集中于它的安全和可行性。我们识别了在 CTO 经历了 revascularization 与的 42 个病人的方法后退在我们的 center.Results 的 2009 年 11 月的从 2005 年 7 月的途径三种策略被使用:作为主要策略(50.0%) 后退,在 antegrade 失败(26.2%) 以后立即后退并且重复在以前的 antegrade 失败(23.8%) 以后的过程。氏族的担保更经常被用作 retrograde 存取线路(92.9%) 。全面成功率是 88.1% 。在病人与成功后退电线十字路口担保隧道到 CTO 的远侧的帽子,开运河的成功率是 94.1% 。在有失败到的病人穿过担保,成功率是 62.5% 。八种不同类型后退技术被使用:吻的电线技术(35.3%),套住的电线和套住的反向的电线技术(17.6%),后端汽球和 microcatherer 颠倒技术(14.7%),控制 antegrade 并且后退追踪的 subintimal (大车)技术(8.8%),反向的大车和修改颠倒运技术(8.8%),后退电线十字路口技术(2.9%)。有 4 复杂并发症没有在里面医院,发生了主要不利心脏的事件(向) 。在里面医院向是 7.7% 。所有他们是 non-Q 挥动心肌的梗塞。没有死亡的盒子或指向 retrograde 途径能是的容器 revascularization,任何一个外科或 percutaneous.Conclusions 为在复杂 CTO 增加开运河的成功率的一个有效工具。保证由富有经验的操作员处理的途径,小心的盒子选择和设备的成功和安全是必要的。GE Lei QIAN Ju-ying LIU Xue-bo QIN Qing CUI Shan-jing YAO Kang SHEN Li MA Jian-ying HUANG Dong XU Shi-kun ZHANG Feng WANG Xiang-fei WANG Qi-bing FAN Bing YAN Yan FENG Qi WANG Hao SHEN An ZHU Ming-hui GE Jun-bo 2010Chinese Medical Journal2010,,7:7
18Simulated Sensitivity of Ozone Generation to Precursors in Beijing during a High O_(3) Episode显示文摘This study uses the WRF-Chem model combined with the empirical kinetic modeling method(EKMA curve)to study the compound pollution event in Beijing that happened in 13−23 May 2017.Sensitivity tests are conducted to analyze ozone sensitivity to its precursors,and to develop emission reduction measures.The results suggest that the model can accurately simulate the compound pollution process of photochemistry and haze.When VOCs and NOx were reduced by the same proportion,the effect of O_(3)reduction at peak time was more obvious,and the effect during daytime was more significant than at night.The degree of change in ozone was peak time>daytime average.When reducing or increasing the ratio of precursors by 25%at the same time,the effect of reducing 25%VOCs on the average ozone concentration reduction was most significant.The degree of change in ozone decreased with increasing altitude,the location of the ozone maximum change shifted westward,and its range narrowed.As the altitude increases,the VOCs-limited zone decreases,VOCs sensitivity decreases,NOx sensitivity increases.The controlled area changed from near-surface VOCs-limited to high-altitude NOx-limited.Upon examining the EKMA curve,we have found that suburban and urban are sensitive to VOCs.The sensitivity tests indicate that when VOCs in suburban are reduced about 60%,the O_(3)-1h concentration could reach the standard,and when VOCs of the urban decreased by about 50%,the O_(3)-1h concentration could reach the standard.Thus,these findings could provide references for the control of compound air pollution in Beijing.Meng CUI Xingqin AN Li XING Guohui LI Guiqian TANG Jianjun HE Xin LONG Shuman ZHAO 2021Advances in Atmospheric Sciences2021,38,7:7
19Crystal orientation dependence of Young's modulus in Ti-Nb-based β-titanium alloy显示文摘The paper investigated the texture evolution of a biomedical β-titanium alloy (Ti-28Nb-13Zr-2Fe) under 15%-85% cold rolling reduction and 700°C-900°C recrystallization annealing treatment,and clarified the effects of crystal orientation on Young's modulus of the alloy.Orientation distribution function (ODF) maps and electron backscatter diffraction (EBSD) analysis revealed that the rolling texture type changed with the increase of reduction according to the sequence:α-fiber texture→γ-fiber texture→α-rotated cubic texture.Young's modulus exhibited the lowest value 54 GPa under 15% reduction.Strong {111}<112> γ-fiber texture was developed after rolling 85% reduction and annealing at 700°C,which was favorable to decreasing Young's modulus in comparison with randomly orientated microstructure.Cyclic loading-unloading tensile test proved that the gradual rotation of {110} slip plane during plastic deformation promoted the development of {001}<110> texture component,leading to the marked decrease of Young's modulus.CUI WenFang1,GUO AiHong2,ZHOU Lian3 & LIU ChunMing1 1 Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education),Northeastern University,Shenyang 110004,China 2 Luoyang Ship Material Research Institute,Luoyang 471039,China 3 Northwest Institute of Nonferrous Metals Research,Xi’an 710016,China 2010Science China(Technological Sciences)2010,53,6:6
20Amplification of the miR-181c/d cluster is inversely correlated with PDCD4 expression in gastric cancer显示文摘miR-181c/d is dysregulated in gastric cancer(GC).We investigated the amplification and expression of miR-181c/d and its predicted target genes in GC.Amplification of miR-181c/d was quantified by genomic real-time PCR in GC and adjacent normal tissues,as well as the levels of mature miR-181c/d was performed by real-time PCR in the same tissues.The potential target genes of miR-181c/d were predicted using bioinformatics software.Expression of one potential target gene,PDCD4,was measured by semiquantitative RT-PCR,real-time PCR,and immunohistochemistry.Next,the relationship between miR181c/d expression and PDCD4 expression was analyzed.Results indicated that the amplification and expression of miR-181c/d were significantly higher in GC than in adjacent normal tissues(primary miR-181c/d,P\0.001;miR-181c,P=0.0344;miR-181d,P=0.0153),and there was a strong correlation between mature miR-181c/d and primary miR-181c/d.Thirty-two target genes were predicted,including PDCD4 which is a known tumor suppressor gene.Expression of PDCD4 was significantly down-regulated in GC as compared to adjacent normal tissues and was inversely correlated with miR-181c/d expression in GC(miR-181c and PDCD4:R=-0.496,P=0.008;miR-181d and PDCD4:R=-0.454,P=0.003).Therefore,miR-181c/d may play a pivotal role in the pathogenesis of GC by downregulating PDCD4 expression.Yuanming Pan Rui Xing Juan An Jiantao Cui Wenmei Li Mingzhou Guo Youyong Lu 2014Chinese Science Bulletin2014,59,19:6
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