|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Hydrothermal recrystallization of the Lower Ordovician dolomite and its significance to reservoir in northern Tarim Basin显示文摘Discovered in S15 and some other wells, the Lower Ordovician in the northern Tarim Basin consists mainly of brown gray-dark gray very fine-fine crystalline dolomite, with a minor portion of locally light gray-white medium-coarse crystalline dolomite. Silicification can be observed in the medium-coarse dolomite, and some euhedral drusy quartz can also be found in pores and fractures of the dolomite. The homogenization temperature of the fluid inclusions in the medium-coarse dolomite is between 110 and 200°C with maximum between 140 and 190°C, and the salinity is between 10.7 and 18.5 wt.% NaCl Eq. The homogenization temperature and salinity of the fluid inclusions in the medium-coarse dolomite are similar to those in the drusy quartz. Compared with the very fine-fine dolomite, the medium-coarse phase contains relatively high Fe and Mn. The average concentration of FeO and MnO in the medium-coarse dolomite is 1.917% and 0.323%, respectively. The medium-coarse dolomite has a remarkable negative Eu anomaly, consistent with the REE pattern of the intermediate-felsic igneous rocks in the Tarim Basin. The oxygen isotopic composition of the medium-coarse dolomite is relatively lighter than that of the very fine-fine dolomite. The δ18OPDB values of the medium-coarse dolomite are between -10.35‰ and -7.31‰. The δ18OSMOW values of the fluid associated with the medium-coarse dolomite can be calculated according to homogenization temperature and oxygen isotope fractionation factor between dolomite and fluid, and the calculated values are between +4‰ and +10‰, consistent with those of the hydrothermal fluid. The medium-coarse dolomite has relatively high 87Sr/86Sr ratios as well, indi- cating an origin associated with intermediate-felsic igneous rock. The homogenization temperature, element composition, REE pattern, oxygen and strontium isotopes demonstrate that the medium-coarse dolomite is the result of recrystallization of very fine-fine dolomite under hydrothermal environment. The hydrothermal dolomite recrystallization is a special event but exists extensively in the Tarim Basin. The recrystallized dolomite becomes well reservoir bed for many intercrystalline pores and dissolution pores are produced in this event, so that more attention should be paid to the altered dolomite during the petroleum exploration in the lower Paleozoic in the Tarim Basin. | ZHU DongYa JIN ZhiJun HU WenXuan | 2010 | Science China Earth Sciences2010，53，3： | 34 |
| 2 | Exploring atmospheric free-radical chemistry in China:the self-cleansing capacity and the formation of secondary air pollution显示文摘Since 1971,it has been known that the atmospheric free radicals play a pivotal role in maintaining the oxidizing power of the troposphere.The existence of the oxidizing power is an important feature of the troposphere to remove primary air pollutants emitted from human beings as well as those from the biosphere.Nevertheless,serious secondary air-pollution incidents can take place due to fast oxidation of the primary pollutants.Elucidating the atmospheric free-radical chemistry is a demanding task in the field of atmospheric chemistry worldwide,which includes two kinds of work:first,the setup of reliable radical detection systems;second,integrated field studies that enable closure studies on the sources and sinks of targeted radicals such as OH and NO3.In this review,we try to review the Chinese efforts to explore the atmospheric free-radical chemistry in such chemical complex environments and the possible link of this fast gas-phase oxidation with the fast formation of secondary air pollution in the city-cluster areas in China. | Keding Lu Song Guo Zhaofeng Tan Haichao Wang Dongjie Shang Yuhan Liu Xin Li Zhijun Wu Min Hu Yuanhang Zhang | 2019 | National Science Review2019，6，3： | 26 |
| 3 | CSCO guidelines for colorectal cancer version 2022:Updates and discussions显示文摘Colorectal cancer(CRC) is the third most common cancer worldwide and the second most common in tumor-related mortality by Global Cancer Statistics 2020(1). Recent data show that the incidence and mortality of CRC in China are increasing(2-4), with the number of new cases and deaths reaching 607,900 and 261,777 in 2019. | Zhijun Yuan Shanshan Weng Chenyang Ye Hanguang Hu Suzhan Zhang Ying Yuan | 2022 | Chinese Journal of Cancer Research2022，34，2： | 16 |
| 4 | Chemical compositions of precipitation and scavenging of particles in Beijing显示文摘Totally 23 precipitation samples were collected in Beijing from May to November in 2003. In order to investigate the chemical composition of precipitation samples, pH, conductivity, concentrations of water-soluble ions and organic acids were analyzed. The average pH of pre-cipitations is 6.18, belonging to the neutral range; the average conductivity is 52.23 μS/cm, which indicates that precipitations in Beijing are obviously polluted; SO 24? , NO3 ? are the most abundant anions with the average concentrations of 521 and 174 μeq·L?1, respectively; the average 2SO 4? /NO3? equivalent ratio is 3.1, which decreases by about 15% compared with the result of 1994; NH+ 4 and Ca2+ are the most abundant cations with the average concentrations of 376 and 397 μeq·L?1, respectively; formic acid, acetic acid and oxalic acid are the main organic acids with the average concentrations of 4.62, 4.60 and 1.17 μeq·L?1, respectively, accounting for 2% of the overall anions. Obvious differences between concentrations before and after precipitation are also observed by SJAC (Steam Jet Aerosol Collector), which shows the removal of particles from the atmosphere by precipitation. | HU Min ZHANG Jing WU Zhijun | 2005 | Science China Chemistry2005，48，3： | 15 |
| 5 | Effects of Deep Fluids on Hydrocarbon Generation and Accumulation in Chinese Petroliferous Basins显示文摘Deep fluids in a petroliferous basin generally come from the deep crust or mantle beneath the basin basement, and they transport deep substances(gases and aqueous solutions) as well as heat to sedimentary strata through deep faults. These deep fluids not only lead to large-scale accumulations of CO_2, CH_4, H_2, He and other gases, but also significantly impact hydrocarbon generation and accumulation through organic-inorganic interactions. With the development of deep faults and magmatic-volcanic activities in different periods, most Chinese petroliferous basins have experienced strong impacts associated with deep fluid activity. In the Songliao, Bohai Bay, Northern Jiangsu, Sanshui, Yinggehai and Pearl Mouth Basins in China, a series of CO_2 reservoirs have been discovered. The CO_2 content is up to 99%, with δ^(13)C_(CO2) values ranging from-4.1‰ to-0.37‰ and ~3He/~4He ratios of up to 5.5 Ra. The abiogenic hydrocarbon gas reservoirs with commercial reserves, such as the Changde, Wanjinta, Zhaozhou, and Chaoyanggou reservoirs, are mainly distributed in the Xujiaweizi faulted depression of the Songliao Basin. The δ^(13)CCH4 values of the abiogenic alkane gases are generally >-30‰ and exhibit an inverse carbon isotope sequence of δ^(13)C_(CH4)>δ^(13)C_(C2H6)>δ^(13)C_(C3H8)>δ^(13)C_(C4H10). According to laboratory experiments, introducing external H_2 can improve the rate of hydrocarbon generation by up to 147% through the kerogen hydrogenation process. During the migration from deep to shallow depth, CO_2 can significantly alter reservoir rocks. In clastic reservoirs, feldspar is easily altered by CO_2-rich fluids, leading to the formation of dawsonite, a typical mineral in high CO_2 partial pressure environments, as well as the creation of secondary porosity. In carbonate reservoirs, CO_2-rich fluids predominately cause dissolution or precipitation of carbonate minerals. The minerals, e.g., calcite and dolomite, show some typical features, such as higher homogenization temperatures than the burial temperature, relatively high concentrations of Fe and Mn, positive Eu anomalies, depletion of 18 O and enrichment of radiogenic ^(87)Sr. Due to CO_2-rich fluids, the development of high-quality carbonate reservoirs is extended to deep strata. For example, the Well TS1 in the northern Tarim Basin revealed a high-quality Cambrian dolomite reservoir with a porosity of 9.1% at 8408 m, and the Well ZS1 C in the central Tarim Basin revealed a large petroleum reserve in a Cambrian dolomite reservoir at ~6900 m. During the upward migration from deep to shallow basin strata, large volumes of supercritical CO_2 may extract petroleum components from hydrocarbon source rocks or deep reservoirs and facilitate their migration to shallow reservoirs, where the petroleum accumulates with the CO_2. Many reservoirs containing both supercritical CO_2 and petroleum have been discovered in the Songliao, Bohaiwan, Northern Jiangsu, Pearl River Mouth and Yinggehai Basins. The components of the petroleum trapped with CO_2 are dominated by low molecular weight saturated hydrocarbons. | ZHU Dongya LIU Quanyou JIN Zhijun MENG Qingqiang HU Wenxuan | 2017 | Acta Geologica Sinica(English Edition)2017，91，1： | 12 |
| 6 | Formation law and criterion of nebulous macroscopic segregation in ZL205A alloy castings显示文摘The appearance of macroscopic segregation in ZL205A alloy castings bears a super resemblance to theappearance of shrinkage porosity, and the chemical composition of the segregation is Al2Cu whose microstructure isin the form of dentrite or skeleton crystal. According to the characteristic of nebulous segregation, the formationprocess could be divided into two steps by the eutectic temperature of Al2Cu. Then a criterion for each of the twosteps is brought forward on the basis of the shrinkage porosity criterion of low pressure casting. | Li Yusheng Zhai Hu Feng Zhijun Qu Xuahui | 2008 | China Foundry2008，5，1： | 11 |
| 7 | Pet-keeping and its impact on asthma and allergies among preschool children in Shanghai, China显示文摘Whether early pet-keeping is a risk factor for children’s asthma and allergies remains controversial.To investigate associations between asthma,allergies and airway symptoms among children and the indoor environment,a cross-sectional study was conducted in 5 districts of Shanghai.A number of 13335 questionnaires(response rate:85.3%)of 4–6 year old children were analyzed.Families in urban areas have more pets except for dogs than families in suburbs.Fish are the most common pets in urban districts.The prevalence of doctor-diagnosed asthma was 10.3%,wheeze(ever)28.3%,rhinitis(ever)54.1%,doctor-diagnosed hay fever 12.6%and eczema(ever)22.9%.In logistic regression analyses,early furred pet-keeping was positively associated with most of the symptoms and significantly with rhinitis(ever,adjusted OR=1.41,95%CI=1.14–1.76)and doctor-diagnosed hay fever(1.38,1.02–1.88).Current furred pet-keeping was significantly negatively associated with doctor-diagnosed asthma(0.57,0.39–0.83).Persistent furred pet-keeping was significantly positively associated with rhinitis on pet or pollen exposure.However,current pet-keeping is not randomly distributed in the population.Children in families with'allergy'or with'pet avoidance behavior'(due to allergies in the family)have more symptoms,but have avoided cats and dogs,leading to the conclusion that such animals are'protective',namely the'Healthy Pet-Keeping'effect.Moreover,rodents and birds are risks for children’s health.Fish-keeping is also seemingly a risk.This study indicates that early pet-keeping is a risk factor for asthma and allergies in families with a history of allergies,and part of residents in Shanghai have pet-avoidance behavior. | HUANG Chen HU Yu LIU Wei ZOU ZhiJun SUNDELL Jan | 2013 | Chinese Science Bulletin2013，58，34： | 8 |
| 8 | Evolution of particle number size distribution in an urban atmosphere during episodes of heavy pollution and new particle formation显示文摘This study discusses the evolution of particle number size distribution during episodes of heavy pollution and new particle formation in the urban atmosphere of Beijing to quantify the effects of dynamic processes (coagulation and condensation) on the particle number size distribution.During a heavy-pollution event,an extremely low number concentration of 3-10 nm particles (on average 46 cm-3) was observed.This is because nucleation-mode particles were easily removed by strong coagulational scavenging of larger particles under this condition.In addition,a large condensation sink (on average 0.13 s-1) restrained nucleation,which is one of the major sources of nucleation-mode particles.Conversely,during a new-particle formation event,the small condensation sink (0.01 s-1) of precursor facilitated nucleation.At the same time,preexisting particles had little ability to scavenge newly formed particles (around 1 nm) and allowed them to grow to a detectable size (larger than 3 nm currently).We suggest that the effects of dynamic processes (coagulation and condensation) on particle size distribution should be stressed under some extreme conditions of the relatively polluted urban atmosphere in addition to traffic and meteorological factors. | WU ZhiJun, HU Min YUE DingLi Birgit WEHNER Alfred WIEDENSOHLER | 2011 | Science China Earth Sciences2011，54，11： | 8 |
| 9 | Stability improvement under high efficiency—next stage development of perovskite solar cells显示文摘With efficiency of perovskite solar cells(PSCs) overpassing 23%, to realize their commercialization, the biggest challenge now is to boost the stability to the same level as conventional solar cells. Thus, tremendous effort has been directed over the past few years toward improving the stability of these cells. Various methods were used to improve the stability of bulk perovskites,including compositional engineering, interface adjustment, dimensional manipulation, crystal engineering, and grain boundary decoration. Diverse device configurations, carrier transporting layers, and counter electrodes are investigated. To compare the stability of PSCs and clarify the degradation mechanism, diverse characterization methods were developed. Overall stability of PSCs has become one central topic for the development of PSCs. In this review, we summarize the state-of-the-art progress on the improvement of device stability and discuss the directions for future research, hoping it provides an overview of the current status of the research on the stability of PSCs and guidelines for future research. | Danni Yu Yue Hu Jiangjian Shi Haoying Tang Wenhao Zhang Qingbo Meng Hongwei Han Zhijun Ning He Tian | 2019 | Science China Chemistry2019，62，6： | 7 |
| 10 | Structural insights into DndE from Escherichia coil B7A involved in DNA phosphorothioation modification显示文摘 | Wei Hu Chengkun Wang Jingdan Liang Tianlong Zhang Zhongpei Hu Zhijun Wang Wenxian Lan Fang Li Houming Wu Jianping Ding Geng Wu Zixin Deng Chunyang Cao | 2012 | Cell Research2012，22，7： | 7 |
| 11 | Using in situ REE analysis to study the origin and diagenesis of dolomite of Lower Paleozoic,Tarim Basin显示文摘In situ REE concentrations of various dolomites from Tarim Basin were obtained by LA-ICP-MS analysis,and the data were normalized to standard seawater(Seawater Normalized=SWN).Most of the samples have a ΣREE range of less than 20 ppm.All samples show similar REESWN distributions with heavy REE depletion,and positive Ce anomaly,which indicates that they have the same dolomitization fluids(seawater).According to the origin and diagenetic process of dolomite,two types of dolomite are determined and described as follows:1) syndepositional dolomite,with the highest REE concentrations(more than 20 ppm),the cores of which are more enriched in REE compared with their cortexes,indicating that they underwent the dolomitization of calcareous sediments by hypersaline and subsequent diagenesis decreased the REE content of the cortex because of the low REE concentration of the diagenetic fluids;2) diagenetic dolomite,which can be subdivided into four groups.(1) burial dolomite which has higher REE concentrations than limestone,but lower than syndepositional dolomite.This shows that pore fluids with high salinity dolomitized the pre-existing limestone;(2) void filling dolomite which has the similar REE patterns with the matrix dolomite.In addition,the Eu anomaly is not obvious,suggesting that the dolomitization fluids originated from the diagenetic fluids;(3) recrystallized dolomite,whose REE concentration was obviously decreased,indicating that the REE concentration was decreased during the recrystallization processes;and(4) hydrothermal altered void-filling dolomite,which has the lowest REE concentration,but obvious positive Eu anomaly,reflecting its hydrothermal activity related origin.Thus,the diverse REE signatures,which were recorded in different dolomites,retain the information of their formation conditions and subsequent diagenetic processes.In situ REE analysis of dolomite is an effective probe into the origin and diagenetic process of dolomite. | WANG XiaoLin JIN ZhiJun HU WenXuan ZHANG JunTao QIAN YiXiong ZHU JingQuan LI Qing | 2009 | Science China Earth Sciences2009，52，5： | 7 |
| 12 | Discovery of low-mature hydrocarbon in manganese nodules and ooze from the Central Pacific deep sea floor显示文摘Extracts from manganese nodules and ooze from the Central Pacific deep sea floor were analyzed using the chromatogram-mass spectrum, and it was found that most of the biomarker molecules are of the low-mature type (some have characteristics of mature): the ratio of 'A'/C is high between 11.4%-19.75%; CPI is 1.22-1.23; C31-22S/ (22S+22R) hopane is 0.59-0.60, Tm/Ts is 0.99-1.99; pa moretane/(αβ+βα) hopane is 0.12-0.14; C29 sterane 20S/(20S+20R) is 0.35-0.41; ββ/(ββ+αα) is 0.38-0.45; arene TA(I)/TA(I+Ⅱ) is 0.16-0.21; methyl-phenanthrene index (MPI1) is 0.35-0.67. According to the geological settings of the sampling area and its organic geochemical characteristics, it is considered that the hydrothermal activities on the ocean floor facilitate the decomposition of organic matter in the sediment, which leads to the generation and migration of hydrocarbon into manganese nodules and ooze. This discovery is important for understanding the mechanisms of hydrocarbon generation in the ocean floor and | HU Wenxuan JIN Zhijun YAO Suping LU Xiancai CHEN Zhilin ZHANG Linye ZHANG Xuejun ZHOU Huaiyang | 2002 | Chinese Science Bulletin2002，47，11： | 7 |
| 13 | Comparison of the short-term and long-term outcomes of laparoscopic hysterectomies and of abdominal hysterectomies: a case study of 4,895 patients in the Guangxi Zhuang Autonomous Region, China显示文摘Background: To evaluate the short-term and long-term outcomes after laparoscopic hysterectomy(LH) compared with abdominal hysterectomy(AH) in case of benign gynecological disease. Methods: A multi-center cohort retrospective comparative study of population among 4,895 hysterectomies(3,539 LH vs.1,356 AH) between 2007 and 2013 was involved. Operative time(OT), estimated blood loss(EBL), intra-operative and post-operative complications, passing flatus; days with indwelling catheter, questionnaires covering pelvic floor functions and sexual functions were assessed.Results: The EBL(174.1±157.4 vs. 263.1±183.2 cc, LH and AH groups, respectively), passing flatus(38.7±14.1 vs. 48.1±13.2 hours), days with indwelling catheter(1.5±0.6 vs. 2.2±0.8 days), use of analgesics(6.5% vs. 73.1%), intra-operative complication rate(2.4% vs. 4.1%), post-operative complication rate(2.3% vs. 5.7%), post-operative constipation(12.1% vs. 24.6%), mild and serious stress urinary incontinence(SUI) post-operative(P<0.001; P=0.014), and proportion of Female Sexual Functioning Index(FSFI) total score <26.55 post-operative(P<0.001) of the LH group were significantly less than those of AH group. There wereno significant differences in OT(106.5±34.5 vs. 106.2±40.3 min) between the two groups.Conclusions: LH is a safe and efficient operation for improving patients' long-term quality of life(Qo L), and LH is a cost-effectiveness procedure for treating benign gynecological disease. LH is superior to AH due to reduced EBL, reduced post-operative pain and earlier passing flatus. | Hongying He Zhijun Yang Dingyuan Zeng Jiangtao Fan Xiaoxia Hu Yuan Ye Hua Bai YanmingJiang Zhong Lin Zhiying Lei Xinlin Li Lian Li Jinghua Gan Ying Lan Xiongzhi Tang Danxia Wang Junsong Jiang Xiaoyan Wu Meiying Li Xiaoqing Ren Xiaomin Yang Mei Liu Qinmei Wang Fuyan jiang Li Li | 2016 | Chinese Journal of Cancer Research2016，28，2： | 6 |
| 14 | Effect of biodiesel on the particle size distribution in the exhaust of common-rail diesel engine and the mechanism of nanoparticle formation显示文摘Effect of biodiesel blends on the particle size distribution (PSD) of exhaust aerosol and the mechanism of nanoparticle formation were investigated with a modern common rail light-duty diesel engine. The results showed that PSD of diesel included two modes:nucleation mode (NM) and accumulation mode (CM). The criterion diameter of the two modes is 50 nm. Only CM was observed for all fuels under the condition of 50 N.m,2000 r/min. When the engine torque was higher than 150 N.m,log-modal PSD of diesel shifted to bimodal. At higher loads,if the biodiesel blend ratio was below 60%,the PSD of biodiesel blends still included the two modes. However,no NM particles were found for pure biodiesel. At lower loads,only CM was found in PSD of all fuels. Significant reduction of CM particles was found for biodiesel blends compared with diesel. Discussion on the mechanism of nanoparticle formation indicated that for the light-duty diesel engine with oxidation catalysts,fuel consumption and exhaust temperature increased with increasing the engine loads,and SO2 was converted to SO3 by catalyst which,in its hydrated form,could act as the precursor for biodiesel NM formation. Therefore,sulfur level of biodiesel blends dominates the nanoparticle formation in light-duty diesel engine with oxidation catalysts. | ZHANG XuSheng ZHAO Hui HU ZongJie WU ZhiJun LI LiGuang | 2009 | Science China(Technological Sciences)2009，52，9： | 5 |
| 15 | Wearable Alignment‑Free Microfber‑Based Sensor Chip for Precise Vital Signs Monitoring and Cardiovascular Assessment显示文摘Continuous pulse wave signals monitoring is the essential basis for clinical cardiovascular diagnosis and treatment.Recent researches show the majority of current electronic pulse sensors usually face challenges in electrical safety concern,poor durability and demanding precision in position alignment.Thus,a highly sensitive,inherently electrical safe,robust and alignment-free device is highly desired.Here,we present a wearable alignment-free microfber-based sensor chip(AFMSC)for precise vital signs monitoring and cardiovascular health assessment.The AFMSC comprises an optical micro/nano fber sensor(MNF)and a fexible soft liquid sac while the MNF sensor is used to perceive the physiological signals and the liquid sac is used to eliminate the misalignment.The real-time and accurate monitoring of the pulse signals was realized by tracking the optical power variation of transmitted light from MNF.Then,the cardiovascular vital signs extracted from radial artery pulse signals were used to evaluate cardiovascular health condition and the results were in accordance with human physiological characteristics.Moreover,the pulse signals from diferent arterial area,the respiration signals from chest and the radial pulse signals before and after exercise were detected and analyzed.The non-invasive,continuous and accurate monitoring of cardiovascular health based on the reported wearable and alignment-free device is promising in both ftness monitoring and medical diagnostics for cardiovascular disease prevention and diagnosis. | Liangye Li Yunfei Liu Changying Song Shunfeng Sheng Liuyang Yang Zhijun Yan Dora Juan Juan Hu Qizhen Sun | 2022 | Advanced Fiber Materials2022，4，3： | 5 |
| 16 | Strong motion characteristics of the M_w 6.6 Lushan earthquake,Sichuan,China——an insight into the spatial difference of a typical thrust fault earthquake显示文摘Near-field strong ground motions are useful for engineering seismology studies and seismic design, but dense observation networks of damaging earthquakes are still rare. In this study, based on the strong-motion data from the M w 6.6 Lushan earthquake, the ground motion parameters in different spatial regions are systematically analyzed, and the contributions from different effects, like the hanging-wall effect, directivity effect, and attenuation effect are separated to the extent possible. Different engineering parameters from the observed ground motions are compared with the local design response spectra and a new attenuation relation of Western China. General results indicate that the high frequency ground motion, like the peak ground acceleration, on two sides of the fault plane is sensitive to the hanging-wall effect, whereas the low frequency ground motion, like the long period spectral acceleration, in the rupture propagation direction is affected by the directivity effect. Moreover, although the M w 6.6 Lushan earthquake is not a large magnitude event, the spatial difference of ground motion is still obvious; thus, for a thrust faulting earthquake, in addition to the hanging effect, the directivity effect should also be considered. | Hu Jinjun Zhang Wenbo Xie Lili Zhang Qi Jiang Zhijun | 2015 | Earthquake Engineering and Engineering Vibration2015，14，2： | 5 |
| 17 | Boiling process of low temperature formation water in petroleum system, Qaidam Basin显示文摘FOLLOWING the study of Roedder et al., boiling fluid inclusions are identified in oil reservoir ofQaidam Basin. This paper reports the general characteristics of the boiling fluid inclusions, analyzes theconditions for the formation water to boil at low temperature, and discusses the relation between the boiling process and the oil/gas accumulation. 1 General features Boiling fluid inclusions are minute records of the immiscibility process of subterranean hydrothermalfluids, which are generally composed of different types trapped simultaneously. They are observed mostlyin magmatic hydrothermal mineral deposits. In sedimentary basins, the boiling process was only found inMVT. The discovery of boiling fluid inclusions in Qaidam Basin is of great significance to | HU Wenxuan~1, JIN Zhijun~2, QIU Nansheng~2, FU Qi~1, LU Xiancai~1 and SUN Rui~1 1. State Key Laboratory of Mineral Deposit Research, Nanjing University, Nanjing 210093, China 2. Basin and Reservoir Reseach Center, University of Petroleum, Beijing 102200, China | 1999 | Chinese Science Bulletin1999，44，S2： | 5 |
| 18 | Dissolution-filling mechanism of atmospheric precipitation controlled by both thermodynamics and kinetics显示文摘Affected by structural uplift,the Ordovician carbonate rockbed in the Tarim Basin,China,was exposed to dissolution and reformation of atmospheric precipitation many times,and formed a large quantity of karst caves serving as hydrocarbon reservoir.However,drilling in Tahe area showed that many large karst caves,small pores and fractures are filled by calcite,resulting in decrease in their reservoir ability.Calcite filled in the karst caves has very light oxygen isotopic composition and87Sr/86Sr ratio.Its 18OPDB ranges from 21.2‰to 13.3‰with the average of 16.3‰and its87Sr/86Sr ratio ranges from0.709561 to 0.710070 with the average of 0.709843.The isotope composition showed that calcite is related to atmospheric precipitation.Theoretic analyses indicated that the dissolving and filling actions of the precipitation on carbonate rocks are controlled by both thermodynamic and kinetic mechanisms.Among them,the thermodynamic factor determines that the precipitation during its flow from the earth surface downward plays important roles on carbonate rocks from dissolution to saturation,further sedimentation,and finally filling.In other words,the depth of the karstification development is not unrestricted,but limited by the precipitation beneath the earth surface.On the other hand,the kinetic factor controls the intensity,depth,and breadth of the karstification development,that is,the karstification is also affected by topographic,geomorphologic,climatic factors,the degree of fracture or fault,etc.Therefore,subject to their joint effects,the karstification of the precipitation on the Ordovician carbonate rocks occurs only within a certain depth(most about 200 m)under the unconformity surface,deeper than which carbonate minerals begin to sedimentate and fill the karst caves that were formed previously. | MENG QingQiang ZHU DongYa HU WenXuan JIN ZhiJun | 2013 | Science China Earth Sciences2013，56，12： | 4 |
| 19 | Characterization of particle number size distribution and new particle formation in Southern China显示文摘Knowledge of particle number size distribution(PND) and new particle formation(NPF)events in Southern China is essential for mitigation strategies related to submicron particles and their effects on regional air quality,haze,and human health.In this study,seven field measurement campaigns were conducted from December 2013 to May 2015 using a scanning mobility particle sizer(SMPS) at four sites in Southern China,including three urban sites and one background site.Particles were measured in the size range of15-515 nm,and the median particle number concentrations(PNCs) were found to vary in the range of 0.3× 10~4-2.2 × 10~4 cn^(-3) at the urban sites and were approximately 0.2 × 10~4 cm^(-3) at the background site.The peak diameters at the different sites varied largely from 22 to 102 nm.The PNCs in the Aitken mode(25-100 nm) at the urban sites were up to 10 times higher than they were at the background site,indicating large primary emissions from traffic at the urban sites.The diurnal variations of PNCs were significantly influenced by both rush hour traffic at the urban sites and NPF events.The frequencies of NPF events at the different sites were0%-30%,with the highest frequency occurring at an urban site during autumn.With higher SO_2 concentrations and higher ambient temperatures being necessary,NPF at the urban site was found to be more influenced by atmospheric oxidizing capability,while NPF at the background site was limited by the condensation sink.This study provides a unique dataset of particle number and size information in various environments in Southern China,which can help understand the sources,formation,and the climate forcing of aerosols in this quickly developing region,as well as help constrain and validate NPF modeling. | Xiaofeng Huang Chuan Wang Jianfei Peng Lingyan He Liming Cao Qiao Zhu Jie Cui Zhijun Wu Min Hu | 2017 | Journal of Environmental Sciences2017，29，1： | 4 |
| 20 | Associations between indoor environmental smoke and respiratory symptoms among preschool children in Shanghai, China显示文摘Whether indoor environmental smoke is harmful for preschool children’s respiratory health in a society where female smoking is rare has not been determined.This study is part of a cross-sectional study(CCHH study-phase one in Shanghai)and investigated associations between parental smoking and incense-burning and respiratory symptoms among 4–6 year old children in Shanghai,China.A number of 13335 valid questionnaires(response rate:85.3%)were analyzed.A number of 56.1%(as reported by a parent)of preschool children in Shanghai are exposed to environmental tobacco smoke(ETS).A number of 40.3%of fathers and0.9%of mothers are smokers.A number of 53.7%and 12.6%of Shanghai residents have used mosquito-repellent incense and incensation respectively.Children exposed to any parental smoking have higher prevalence of wheeze and croup than those not exposed.Current maternal smoking has a significant and positive association with wheeze(in the last 12 months,AOR,95%CI:1.83,1.11–2.99).However,paternal smoking either currently or at child’s birth had only weak associations with wheeze and croup.Incense-burning(mosquito-repellent incense and incensation)had significant and negative association with doctor-diagnosed asthma(AOR,95%CI:0.85,0.73–0.99)and hay fever(AOR,95%CI:0.80,0.70–0.93).The results indicate that maternal smoking perhaps is a stronger risk factor for children’s respiratory health than paternal smoking. | LIU Wei HUANG Chen HU Yu ZOU ZhiJun SUNDELL Jan | 2013 | Chinese Science Bulletin2013，58，34： | 4 |
您所在的机构暂未开通此部分的功能，请联系管理员