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325篇 您的检索式:作者名="Gaofeng"
    题名 作者 年代 出处 被引量
1The Molecular Mechanism of HDAC Inhibitors in Anticancer Effects显示文摘HDAC 和帽子是哪个的二种酶 catalyse deacetylation 和在优核质的 histone 的 acetylation,其动态平衡在 DNA 为基因抄写和优核质的基因表示有精确规定水平。他们的 Disbalance 能在正常房间带增长和区别的混乱,然后导致肿瘤的开始。他们的异常功能是直接与各种各样的肿瘤的开始和前进有关例如 promyelocytic 白血病, Hodgkin 淋巴瘤,结肠的癌症和 gastral 癌症。HDAC 的禁止者被用于肿瘤的治疗。他们能制止 HDAC 的活动并且堵住 deacetylation 的混乱引起的基因表示的抑制。它的主要生物效果在导致肿瘤房间的区别躺着,逮捕在 G0/G1 的房间圆,激活房间 apoptosis 基因,提高化学治疗和放射性的治疗的敏感。到目前为止 HDAC 是在 anticancer 药 research.Cellular 与分子的免疫学的重要目标酶。2006; 3 (4 ): 285-290。Gaofeng Bi Guosheng Jiang 2006Cellular & Molecular Immunology2006,3,4:20
2Microstructure control techniques in primary hot working of titanium alloy bars:A review显示文摘How to control the microstructure of titanium alloy bars is important to fabricating high-performance aerial forgings. This paper gives a thorough survey of the manufacturing methods and microstructure control techniques for titanium alloy bars. It summarizes the effects of processing parameters on the mechanisms and laws of microstructure evolution during b working and(a + b) working, including the kinetics and grains size of dynamic recrystallization(DRX) during b deformation and the kinetics and grains size of spheroidization during(a + b) deformation. The trends in microstructure control techniques are presented for fabricating titanium alloy bars with high efficiency, low cost, and high quality by means of b/(a + b) working, and the puzzles and challenges in the future are also pointed out.Guo Lianggang Fan Xiaoguang Yu Gaofeng Yang He 2016Chinese Journal of Aeronautics2016,29,1:19
3Effect of electrically stimulating acupoint, Zusanli(ST 36), on patient’s recovery after laparoscopic colorectal cancer resection: a randomized controlled trial显示文摘OBJECTIVE:To investigate the effect of transcutaneous electrical acupoint stimulation (TEAS) on enhanced recovery after surgery (ERAS) in laparoscopic colorectal cancer resection and its clinical significance.METHODS:Sixty-four patients undergoing laparoscopic colorectal resection were randomly divided into two groups,the control group (group A) and the TEAS group (group B).Patients in the TEAS group received electroacupuncture stimulation of bilateral Zusanli (ST 36) at 30 min before anesthesia to the end of surgery.The patients in the control group were not given the stimulation.Perioperative anesthesia management of the two groups were performed according to the ERAS guidelines,and postoperative patient-controlled intravenous analgesia (PCIA) was used.The amount of remifentanil used in the two groups was observed and recorded,and the visual analogue scale (VAS) of the 4,12,24 and 48 h after surgery in the two groups was recorded.Moreover,postoperative anal exhaust time,postoperative feeding time,postoperative first ambulation time and postoperative hospital stay length were compared between the two groups.RESULTS:Compared with group A,the VAS score of group B decreased significantly at 48 h after operation (P < 0.05).The postoperative anal exhaust time in group B was significantly shorter than that of group A (P < 0.05).There was no significant difference between the two groups with regards to remifentanil consumption,postoperative feeding time,postoperative first ambulation time and postoperative hospital stay (all P > 0.05).CONCLUSION:TEAS can promote the recovery of postoperative gastrointestinal function and reduce the pain intensity 48 h after surgery,thus satisfying the need of early postoperative analgesia.Huang Wei Yu Tingyu Long Wenfei Xiao Jianbin Zhao Gaofeng 2019Journal of Traditional Chinese Medicine2019,39,3:14
4Down-Regulation of CD44 Contributes to the Differentiation of HL-60 Cells Induced by ATRA or HMBA显示文摘CD44 is highly expressed in human acute myeloid leukemia (AML) cells. Some experiments had shown that it was possible to reverse differentiation blockage in AML cells by CD44 ligation with specific antibodies, indicating that CD44 was closely related to the differentiation of leukemia cells. The differentiation of acute promyelocytic leukemia cell line HL-60 cells could be induced by all trans-retinoic acid (ATRA) and hexamethylene bisacetamide (HMBA), but so far the mechanism was not demonstrated clearly. In the present study, we investigated whether ATRA or HMBA induced the growth arrest of HL-60 cells by down-regulating the expression of CD44. The results indicated that the proliferation of HL-60 cells was obviously inhibited and the differentiation was induced by both ATRA and HMBA. The decreased expression of CD44 and cyclin E mRNA, and the increased expression of p27 and p21 at mRNA levels were observed. Furthermore, there was a negative correlation between the expression of CD44 and p27. It was concluded that ATRA and HMBA played a role in the differentiation induction of HL-60 cells, which was mediated by the down-regulation of CD44, accompanied by down-regulation of cyclin E, and up-regulation of p27 and p21 mRNA.Jianing Liu1, Gaofeng Bi1, Pei’e Wen1, Weihua Yang1, Xia Ren1, Tianhua Tang1, Chao Xie1, Wei Dong1 and Guosheng Jiang1, 21Department of Hemato-oncology, Institute of Basic Medicine, Shandong Academy of Medical Sciences Key Laboratory for Modern Medicine and Technology of Shandong Province Key Medical Laboratory for Tumor Immunology & Traditional Chinese Medicine Immunology of Shandong Province, Jinan, Shandong 250062, China 2007Cellular & Molecular Immunology2007,4,1:12
5Two-dimensional heterostructure promoted infrared photodetection devices显示文摘It is a rapidly developed subject in expanding the fundamental properties and application of two-dimensional(2D)materials.The weak van der Waals interaction in 2D materials inspired researchers to explore 2D heterostructures(2DHs)based broadband photodetectors in the far-infrared(IR)and middle-IR regions with high response and high detectivity.This review focuses on the strategy and motivation of designing 2DHs based high-performance IR photodetectors,which provides a wide view of this field and new expectation for advanced photodetectors.First,the photocarriers'generation mechanism and frequently employed device structures are presented.Then,the 2DHs are divided into semimetal/semiconductor 2DHs,semiconductor/semiconductor 2DHs,and multidimensional semi-2DHs;the advantages,motivation,mechanism,recent progress,and outlook are discussed.Finally,the challenges for next-generation photodetectors are described for this rapidly developing field.Gaofeng Rao Xuepeng Wang Yang Wang Peihua Wangyang Chaoyi Yan Junwei Chu Lanxin Xue Chuanhui Gong Jianwen Huang Jie Xiong Yanrong Li 2019InfoMat2019,1,3:12
6Progress in monitoring high-temperature damage to rice through satellite and ground-based optical remote sensing显示文摘The occurrence of rice high-temperature damage (HTD) has increased with global warming. Cultivation of rice is seriously affected by the HTD in the middle and lower reaches of the Yangtze River, which directly affects food security in this region and in the whole of China. It is important to monitor and assess crop HTD using satellite remote sensing information. This paper reviews the recent development of monitoring rice HTD using optical remote sensing information. It includes the use of optical remote sensing information to obtain the regional spatial distribution of high temperatures, mixed-surface temperature retrieval for rice fields based on mixed decomposition information, the development of field and thermal infrared testing and modeling, and the satellite/ground-based remote sensing coupled method for monitoring rice HTD. Finally, the prospects for monitoring crop HTD based on remote sensing information are summarized.ZHANG JiaHua YAO FengMei LI BingBai YAN Hao HOU YingYu CHENG GaoFeng Vijendra BOKEN 2011Science China Earth Sciences2011,54,12:11
7Commissioning progress of the FAST显示文摘The Five-hundred-meter Aperture Spherical radio Telescope(FAST) was completed with its main structure installed on September 25, 2016, after which it entered the commissioning phase. This paper aims to introduce the commissioning progress of the FAST over the past two years. To improve its operational reliability and ensure effective observation time, FAST has been equipped with a real-time information system for the active reflector system and hierarchical commissioning scheme for the feed support system, which ultimately achieves safe operation of the two systems. For meeting the high-performance indices, a highprecision measurement system was set up based on the effective control methods that were implemented for the active reflector system and feed support system. Since the commissioning of the FAST, a low-frequency ultra-wideband receiver and 19-beam1.05-1.45 GHz receiver have been mainly used. Telescope efficiency, pointing accuracy, and system noise temperature were completely tested and ultimately achieved the acceptance indices of the telescope. The FAST has been in the process of national acceptance preparations and has begun to search for pulsars. In the future, it will still strive to improve its capabilities and expand its application prospects.Peng Jiang YouLing Yue HengQian Gan Rui Yao Hui Li GaoFeng Pan JingHai Sun DongJun Yu HongFei Liu NingYu Tang Lei Qian JiGuang Lu Jun Yan Bo Peng ShuXin Zhang QiMing Wang Qi Li Di Li 2019Science China(Physics,Mechanics & Astronomy)2019,62,5:11
8Diagenesis of the Triassic Yanchang Formation Tight Sandstone Reservoir in the Xifeng–Ansai Area of Ordos Basin and its Porosity Evolution显示文摘This work aims to reveal the evolution of the porosity in the Triassic Yanchang Formation tight sandstone reservoir of the Xifeng–Ansai area of Ordos Basin. Based on destructive diagenesis(compaction and cementation) and constructive diagenesis(dissolution) of sandstone reservoirs, this study analyzed the diagenesis characteristics of the tight sandstone reservoirs in this area, and discussed the relationship between sandstone diagenesis and porosity evolution in combination with present porosity profile characteristics of sandstone reservoir. The effect simulation principle was employed for the mathematical derivation and simulation of the evolution of porosity in the Yanchang Formation tight sandstone reservoirs. The result shows that compaction always occurs in tight sandstone reservoirs in the Yanchang Formation, and cementation occurs when the burial depth increases to a certain value and remains ever since. Dissolution occurs only at a certain stage of the evolution with window features. In the corresponding present porosity profile, diagenesis is characterized by segmentation. From the shallow to the deep, compaction, compaction, cementation and dissolution, compaction and cementation occur successively. Therefore, the evolution of sandstone porosity can be divided into normal compaction section, acidification and incremental porosity section, and normal compaction section after dissolution. The results show that the evolution of sandstone porosity can be decomposed into porosity reduction model and porosity increase model. The superposition of the two models at the same depth in the three stages or in the same geological time can constitute the evolution simulation of the total porosity in sandstone reservoirs. By simulating the evolution of sandstone reservoir porosity of the eighth member in Xifeng area and the sixth member in Ansai area, it shows that they are similar in the evolution process and trend. The difference is caused by the regional uplift or subsidence and burial depth.LIU Mingjie LIU Zhen WANG Peng PAN Gaofeng 2016Acta Geologica Sinica(English Edition)2016,90,3:11
9OPTIMAL DESIGN OF A 6-AXIS FORCE TRANSDUCER BASED ON STEWART PLATFORM RELATED TO SENSITIVITY ISOTROPY显示文摘The design method of a 6-axis force robot's transducer based on the Stewart platform is detailed.For this purpose, the sensitivity isotropy evaluation criteria of the transducer are defined, and by the aid of computer, the relationships between the criteria and the parameters of all the transducers based on the Stewart platform are investigated within the geometric model of the solution space, which can provide the theoretical background for the optimal construction design of the 6-axis force transducer related to the sensitivity isotropy.JinZhenlin GaoFenfl GaoFeng 2003Chinese Journal of Mechanical Engineering2003,16,2:10
10Formability,microstructure evolution and mechanical properties of wire arc additively manufactured AZ80M magnesium alloy using gas tungsten arc welding显示文摘Wire arc additive manufacturing(WAAM)technology has been used to fabricate the multi-layer single-pass deposited wall of AZ80M magnesium(Mg)alloy by gas tungsten arc welding.The formability,thermal cycles,microstructural evolution and mechanical properties of the WAAM AZ80M Mg alloy were investigated.The results show that there was significant difference in the temperature variation and the geometries between the original several layers and the subsequent deposited layers.Owing to the arc energy input,the interpass temperature rised rapidly and then stabilized at 150℃.As a result,the width of the deposited wall increased and then kept stable.There were obvious differences in the microstructure of the WAAM AZ80M Mg alloy among the top zone,intermediate zone and bottom zone of deposited wall.During the arc deposition process,theβphase of the WAAM AZ80M Mg alloy redissolved due to the cyclic heat accumulation,and then precipitated in the grain boundary.The cyclic heat accumulation also led to weakening of dendrite segregation.From the substrate to the top zone,the hardness of the deposited wall decreased gradually,and the intermediate zone which was the main body of deposited wall had relatively uniform hardness.The tensile properties of the WAAM AZ80M Mg alloy were different between the vertical direction and the horizontal direction.And the maximum ultimate tensile strength of the WAAM AZ80M Mg alloy was 308 MPa which was close to that of the as-extruded AZ80M Mg alloy.Yangyang Guo Gaofeng Quan Yinglong Jiang Lingbao Ren Lingling Fan Houhong Pan 2021Journal of Magnesium and Alloys2021,9,1:10
11Expression of HMGB2 indicates worse survival of patients and is required for the maintenance of Warburg effect in pancreatic cancer显示文摘高活动性组蛋白质(HMG ) 是第二很丰富的染色质蛋白质并且在活跃或不活跃的染色质域的建立施加全球 genomic 函数。通过和 nucleosomes,抄写因素,改变 nucleosome 机器和 histones 的相互作用, HMG 家庭蛋白质贡献响应快速的环境变化抄写调节的罚款。哺乳动物的高活动性组 B (HMGB ) 被领域用一条长酸的尾巴跟随了的二个双人脚踏车 HMG 盒子描绘。最近的研究证明 HMGB 的那高表情在许多癌症被发现了,例如前列腺,肾,卵巢、胃的癌症。然而,他们在胰腺的癌症的角色很少被报导了。在这研究,我们估计了 HMGB 蛋白质的诊断、预示的值,包括 HMGB1, HMGB2,和 HMGB3,在从癌症染色体地图集(TCGA ) 数据集的胰腺的癌症。我们的结果证明 HMGB2 在胰腺的癌症预言了差的预后。在 vitro,研究证明 silencing HMGB2 禁止了房间增长和生存能力。机械学地,我们的结果证明 silencing HMGB2 减少了组织缺氧可诱导的因素 1 (HIF1 ) 蛋白质水平和禁止的调停 HIF1 的 glycolysis 处理。进一步的分析显示包括 GLUT1, HK2,和 LDHA,指向 HIF1 的 glycolytic 基因都是预示的因素并且断然与 HMGB2 表示相关。一起拿,我们为胰腺的癌症发现了新预示、预兆的标记,并且在癌症在 glycolytic 控制使 HMGB2 的新奇函数清楚些。Xin Cai Hongjian Ding Yanxia Liu Gaofeng Pan Qingguo Li Zhen Yang Weiyan Liu 2017Acta Biochimica et Biophysica Sinica2017,49,2:9
12Joint Computing and Communication Resource Allocation for Satellite Communication Networks with Edge Computing显示文摘Benefit from the enhanced onboard processing capacities and high-speed satellite-terrestrial links,satellite edge computing has been regarded as a promising technique to facilitate the execution of the computation-intensive applications for satellite communication networks(SCNs).By deploying edge computing servers in satellite and gateway stations,SCNs can achieve significant performance gains of the computing capacities at the expense of extending the dimensions and complexity of resource management.Therefore,in this paper,we investigate the joint computing and communication resource management problem for SCNs to minimize the execution latency of the computation-intensive applications,while two different satellite edge computing scenarios and local execution are considered.Furthermore,the joint computing and communication resource allocation problem for the computation-intensive services is formulated as a mixed-integer programming problem.A game-theoretic and many-to-one matching theorybased scheme(JCCRA-GM)is proposed to achieve an approximate optimal solution.Numerical results show that the proposed method with low complexity can achieve almost the same weight-sum latency as the Brute-force method.Shanghong Zhang Gaofeng Cui Yating Long Weidong Wang 2021China Communications2021,18,7:8
13Levels of synthetic musk fragrances in human milk from three cities in the Yangtze River Delta in Eastern China显示文摘Synthetic musks are used as additives in many household products.After absorption into the human body,they accumulate and their concentrations in human milk reflect both the mother and her infant's exposure level.Concentrations of four synthetic musks,musk xylene(1-tert-butyl-2,6-dimethyl-2,4,6-trinitrobenzene,MX),musk ketone(4-tert-butyl-2,6-dimethyl-3,5-dinitroacetophenone,MK),1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[γ]-2-benzopyran(HHCB) and 7-acetyl-1,1,3,4,4,6-hexamethyl-1,2,3,4tetrahydronaphthalene(AHTN),were determined in human milk samples collected from Shanghai,Wuxi,and Shaoxing in Eastern China.The four synthetic musks were found in most samples analyzed,with HHCB the dominant component followed by MX.The median(mean) values for HHCB,AHTN,MX and MK concentrations were 63(82),5(12),17(24) and 4(9) ng/g lipid weight,respectively.These data suggested the total synthetic musk contamination was low,and the distribution percentage was HHCB > MX > AHTN ≈ MK.The relative high ratio of nitro to polycylic musk indicated that nitro musks were still widely used.The musk concentrations in these cities were not significantly different from each other(p > 0.05).Principal components score plots were obtained,which showed similar exposure sources.The amount of total synthetic musks in human milk were not associated with mother's age,although HHCB was significantly correlated with AHTN(p < 0.05).Daily ingestion of HHCB,AHTN,MX and MK for infants from human milk were estimated as(2526 ± 2926),(370 ± 524),(7391 ± 832),and(277 ± 462) ng/day,respectively.Those doses were 1-2 orders of magnitude below the provisional tolerable daily intakes.Xiaolan Zhang Gaofeng Liang Xiangying Zeng Jing Zhou Guoying Sheng Jiamo Fu 2011Journal of Environmental Sciences2011,23,6:8
14Effect of tensor force on dissipation dynamics in time-dependent Hartree-Fock theory显示文摘The role of tensor force on the collision dynamics of16O+16O is investigated in the framework of a fully three-dimensional timedependent Hartree-Fock theory.The calculations are performed with modern Skyrme energy functional plus tensor terms.Particular attention is given on the analysis of dissipation dynamics in heavy-ion collisions.The energy dissipation is found to decrease as an initial bombarding energy increases in deep-inelastic collisions for all the Skyrme parameter sets studied here because of the competition between the collective motion and the single-particle degrees of freedom.We reveal that the tensor forces may either enhance or reduce the energy dissipation depending on the different parameter sets.The fusion cross section without tensor force overestimates the experimental value by about 25%,while the calculation with tensor force T11 has good agreement with experimental cross section.DAI GaoFeng GUO Lu ZHAO EnGuang ZHOU ShanGui 2014Science China(Physics,Mechanics & Astronomy)2014,57,9:8
15Using Highway Connections to Enable Deep Small-footprint LSTM-RNNs for Speech Recognition显示文摘Long short-term memory RNNs(LSTMRNNs) have shown great success in the Automatic speech recognition(ASR) field and have become the state-ofthe-art acoustic model for time-sequence modeling tasks.However, it is still difficult to train deep LSTM-RNNs while keeping the parameter number small. We use the highway connections between memory cells in adjacent layers to train a small-footprint highway LSTM-RNNs(HLSTM-RNNs), which are deeper and thinner compared to conventional LSTM-RNNs. The experiments on the Switchboard(SWBD) indicate that we can train thinner and deeper HLSTM-RNNs with a smaller parameter number than the conventional 3-layer LSTM-RNNs and a lower Word error rate(WER) than the conventional one.Compared with the counterparts of small-footprint LSTMRNNs, the small-footprint HLSTM-RNNs show greater reduction in WER.CHENG Gaofeng LI Xin YAN Yonghong 2019Chinese Journal of Electronics2019,28,1:7
16Chemical vapor deposition of monolayer WS2 nano- sheets on Au foils toward direct application in hydrogen evolution显示文摘Monolayer tungsten disulfide (WS2), a typical member of the semiconducting transition metal dichalcogenide family has drawn considerable interest because of its unique properties. Intriguingly the edge of WS2 exhibits an ideal hydrogen binding energy which makes WS2 a potential alternative to Pt-based electrocatalysts for the hydrogen evolution reaction (HER). Here, we demonstrate for the first time the successful synthesis of uniform monolayer WS2 nanosheets on centimeter- scale Au foils using a facile, low-pressure chemical vapor deposition method. The edge lengths of the universally observed triangular WS2 nanosheets are tunable from -100 to N1,000 nm. The WS2 nanosheets on Au foils featuring abundant edges were then discovered to be efficient catalysts for the HER, exhibiting a rather high exchange current density of -30.20 μA/cm2 and a small onset potential of Nl10 mV. The effects of coverage and domain size (which correlate closely with the active edge density of WS2) on the electrocatalytic activity were investigated. This work not only provides a novel route toward the batch-production of monolayer WS2 via the introduction of metal foil substrates but also opens up its direct application for facile HER.Yanshuo Zhang Jianping Shi Gaofeng Han Minjie Li Qingqing Ji Donglin Ma Yu Zhang Cong Li Xingyou Lang Yanfeng Zhang Zhongfan Liu 2015Nano Research2015,8,9:7
17Multivalent m^6A motifs promote phase separation of YTHDF proteins显示文摘Dear Editor,Posttranscriptional modifications of coding and non-coding RNAs are prevale nt in cells.N6-methylade no sine (m6A) is the most abundant type of modification on eukaryotic messenger RNAs (mRNAs).1 This modification plays important roles in multiple fundamental biological processes, for example, cell differentiation, tissue development and tumorigenesis.Yifei Gao Gaofeng Pei Dongxue Li Ru Li Yanqiu Shao Qiangfeng Cliff Zhang Pilong Li 2019Cell Research2019,29,9:7
18Synthesis of a novel illite@carbon nanocomposite adsorbent for removal of Cr(Ⅵ)from wastewater显示文摘A novel illite@carbon(I@C) nanocomposite adsorbent has been synthesized via a facile hydrothermal carbonization process(HTC) using glucose as carbonaceous source and illite as the carrier.The morphology,microstructure and surface properties of the prepared nanocomposite adsorbent were analyzed by FESEM,TGA,XRD,FT-IR and Zeta potential measurements.Batch experiments were carried out on the adsorption of Cr(Ⅵ) to determine the adsorption properties of the composite.The adsorption of Cr(Ⅵ) onto the I@C nanocomposite was well described by the pseudo-second-order kinetic model and Langmuir isotherm.Compared with the illite and carbon material(SC) separately,the prepared I@C nanocomposite adsorbent exhibited enhanced adsorption performance for Cr(Ⅵ) with a maximum adsorption capacity of 149.25 mg/g,which was higher than that of most reported adsorbents.In addition,the adsorption process was spontaneous and endothermic based on the adsorption thermodynamics study.The adsorption of Cr(Ⅵ) by I@C was highly p H-dependent and the optimum adsorption occurred at p H 2.0.The Zeta potential analysis results indicated that the electrostatic interactions between anionic Cr(Ⅵ) and the positively charged surface of the adsorbent might be critical to the adsorption mechanism.This study demonstrated that the I@C nanocomposite should be a promising candidate for a low-cost,environmental friendly and highly efficient adsorbent for the removal of toxic Cr(Ⅵ) from wastewater.Gaofeng Wang Shan Wang Wen Sun Zhiming Sun Shuilin Zheng 2017Journal of Environmental Sciences2017,29,7:7
19A new seismic isolation system and its feasibility study显示文摘这份报纸介绍称为一个周期的基础(PF ) 的一个新地震隔离系统,在包括周期性地被安排的地方。PF 与传统的基础隔离不同因为它在结构引起基本频率移动,因此减少它的反应并且产生频率差距。如果一个震波的频率内容掉进差距,它不能在基础宣传。因此,它不对上面的结构施加影响。为 2D PF 的频率差距的乐队的系统的研究被进行。象密度和有弹性的模量以及频率差距的乐队上的 PF 和它的材料的充满的部分那样的物理、几何的参数的影响被调查,并且有象 2.49 鈥 ?.72 Hz 一样低的频率差距的一个图案被完成。频率差距的这个乐队在地震工程对应于很好设计系列。有不同基础的六故事的框架结构的数字模拟证明一个建议 PF 罐头极大地减少孤立的结构的地震反应。这调查证明 PF 在地震隔离技术的未来应用有大潜力。关键词地震隔离 - 周期的基础 - 频率差距的乐队旁边支持了:在资助 No.90715006Jia Gaofeng~+ and Shi Zhifei~(++) School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China Graduated Student ++ Professor 2010Earthquake Engineering and Engineering Vibration2010,9,1:6
20Distribution of isotopes and chemicals in precipitation in Shule River Basin,northwestern China:an implication for water cycle and groundwater recharge显示文摘The distribution of stable isotopes and ions in precipitation in the Shule River Basin,northwestern China,were investigated to understand the regional water cycle and precipitation input to groundwater recharge.The study found that the mean annual concentrations of Ca2+,Na+,SO42–,Cl–,Mg2+,NO3–,and K+ in the basin were lower than those in other arid areas of northwestern China.The average concentrations of ions in the lower reaches of the Shule River were higher than those in the upper reaches.The results showed that the main ionic concentrations decreased with the increase of precipitation amount,indicating that heavy precipitation cannot only wash crustal aerosols out of the atmosphere,but also create a dilution effect.Cl– and Na+ in precipitation had a strong and positive correlation,suggesting a common origin for the two ions.However,the excess of Na+,combined with non-marine SO42– and NO3–,indicated that some ions were contributed by terrestrial origins.In the extremely arid regions of northwestern China,the evaporation process obviously changes the original relationship between δ2H and δ18O in precipitation,and leads to dexcess values <8‰.δ18O and temperature were significantly correlated,suggested that temperature strongly affected the characteristics of isotopes in the study area.The δ18O value indicates a dominant effect of westerly air masses and southwest monsoon in warm months,and the integrated influence of westerly and Siberian-Mongolian polar air masses in cold months.The d-excess values were generally lower in warm months than those in cold months,indicating that post-condensation processes played a significant role in the water cycle.The results provide reliable precipitation input information that can be used in future groundwater recharge calculations in the study area.ZHAO Wei MA Jinzhu GU Chunjie QI Shi ZHU Gaofeng HE Jiahua 2016Journal of Arid Land2016,8,6:6
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