镇旬矿田属秦岭泥盆系铅锌一菱铁矿带,矿化在空间上分布于乾佑河南北向古断陷的两侧,产生于泥盆纪.铅锌矿化特征与凤太矿田的诸矿床及西成矿田的毕家山、邓家山等矿床相似.铅同位素组成是均匀的,模式年令略老于含矿地层年令,硫化物的硫...镇旬矿田属秦岭泥盆系铅锌一菱铁矿带,矿化在空间上分布于乾佑河南北向古断陷的两侧,产生于泥盆纪.铅锌矿化特征与凤太矿田的诸矿床及西成矿田的毕家山、邓家山等矿床相似.铅同位素组成是均匀的,模式年令略老于含矿地层年令,硫化物的硫同位素组成为海水硫酸盐型.矿体有沉积似层状和交代不规则状两种形态,主要围岩蚀变为硅化和铁白云石化.矿化与生物灰岩有密切空间和成因联系.因而说镇旬矿田与矿带中其余三个矿田的铅锌矿有相同的成因,成矿模式类似于E. D. Large(1981)和M. J. Russell(1983)提出的喷流成矿模式.展开更多
Engine noise source identification is essential for making noise reduction strategies.Predominant noise sources of engines are normally identified as some cover components such as oil pan, valve cover and front gear c...Engine noise source identification is essential for making noise reduction strategies.Predominant noise sources of engines are normally identified as some cover components such as oil pan, valve cover and front gear cover etc. The radiated noise sources of a 6-cylinder construction diesel engine are identified with two methods-lead covering technique and surface vibration technique,and the ranking of the major cover on the basis of acoustic power is presented in this paper. Firstly the sound power level of these cover components and their contributions to the total acoustic power are determined with lead covering method under hemi-anechoic condition. Then the vibration characteristics of these components are investigated. The sound power level of various components is predicted via the mean square area average vibration. Both results basically agree well and verify the effectiveness of both techniques in engineering field.展开更多
The risk assessment right from the source of emissions can effectively guide the pollution control. A model was established, consisting of four part： source estimation, environmental fate analysis, exposure analysis ...The risk assessment right from the source of emissions can effectively guide the pollution control. A model was established, consisting of four part： source estimation, environmental fate analysis, exposure analysis and risk assessment. The human health risk, ecological risk and total risk of lead emissions were assessed. The factors were estimated to indicate the environmental decrease and exposure probability. Of all the 1887 t emissions in China in 2010（quantified in the previous work）, it is turned out 1.3 t reached human bodies（0.9 mg/ca）, and 2.7 t reached the ecosystem. Lead mainly came from the Use stage for the source while lead causing risk mainly came from the Waste Management Recycling and Production stages. As for chemical forms, PbO contributed most to the human health risk and PbSO_4 contributed most to the ecological risk. PbSO_4, PbO and Pb altogether contributed 71% to the total risk, indicating these three chemicals should be taken priority for the risk management.展开更多
For revealing the ore sources of the Dachang tin?polymetallic ore deposit, the lead isotopes were analyzed systematically by using the single minerals of sulphides, including pyrite, pyrrhotite, sphalerite, and galena...For revealing the ore sources of the Dachang tin?polymetallic ore deposit, the lead isotopes were analyzed systematically by using the single minerals of sulphides, including pyrite, pyrrhotite, sphalerite, and galena. Then, the mineral sources and their characteristics were discussed based on the classical lead isotope discriminating model. The results show that the lead isotope ratios of206Pb/204Pb,207Pb/204Pb, and208Pb/204Pb range from 17.478 to 18.638, 15.440 to 15.858, and 37.556 to 39.501, respectively. According to Zartman lead model, the ore lead contains the upper crust composition; however, the granite does not provide all ore leads, and other material sources exist. Obviously, the ore deposit belongs to the result of the combined effect of crust?mantle. The source rocks are characterized by a certain degree of similarity with the island arc material. Moreover, its distant origin in the upper and lower crusts may be related to the subduction island arc material or oceanic crust. The mantle-derived material may have a certain status in the source region. Meanwhile, based on the lead isotope three-dimensional topology projection vectors, the ore leads are concentrated in zoneA, which indicates the characteristics of Yangtze lead isotope province and a possible genetic relationship with Yangtze block.展开更多
Sedimentation of fine-grained deposits on coastal zones and continental shelves are important because of the association with chemical pollutants, and the implication to the impact on biological processes, the stratig...Sedimentation of fine-grained deposits on coastal zones and continental shelves are important because of the association with chemical pollutants, and the implication to the impact on biological processes, the stratigraphic correlations, and changes in sedimentary environments. The Yellow Sea continental shelf receives large quantities of sediment from the Huanghe （Yellow） River. Unfortunately, little attention has been yet paid to the sedimentation on the shallow shelf and its features, and the vertical sediment flux in the area is poorly understood. In this study, nine cores were collected in northern Yellow Sea by the R/V Science 1 in September, 1998 and 1999 to examine the sedimentation rate, sediment flux and the provenance with ^210Pb analysis. The 2^210Pb activity profiles showed that the vertical sediment flux ranged from 0.06 to 1.18 g/cm^2·a in the region. In central part of the area, there was a patch of fine-grained mud, with the flux below 0.33 g/cm^2·a. Most profiles were featured in two-segment model. Differences in the profiles reflected spatial and temporal variations in hydrodynamic and sedimentary processes. In order to determine the provenance and sedimentary setting in the area, the geochemistry of Ca, Fe, Sr, Cu, Ti and Rb in 11 surficial sediment samples were studied, which showed that in the central northern Yellow Sea, the mud deposit was from multi-source but mainly from the Huanghe River.展开更多
The trends of distribution,translocation and seasonal change of heavy metal Pb were studied based on the surface and bottom water sampling in Jiaozhou Bay in 1979,and compared with those in 1990's.The results show...The trends of distribution,translocation and seasonal change of heavy metal Pb were studied based on the surface and bottom water sampling in Jiaozhou Bay in 1979,and compared with those in 1990's.The results showed that the source of Pb in the bay was from wastewater and sewage in the east of Jiaozhou Bay from ocean vessels.Pb concentration was higher in spring and lower in summer and autumn,and remained stable through sedimentation in the bottom layer.The overall water quality was good in 1970's.Compared with the environmental monitoring data of 1995-1999,Pb pollution had become serious.Therefore,more efforts should be made to protect the bay from Pb pollution.展开更多
In order to evaluate the effects of structural control and energy transition for the base-isolation with energy transducer （BIET）, shaking table tests on a steel frame model （BIET system） with scale of 1：4 were c...In order to evaluate the effects of structural control and energy transition for the base-isolation with energy transducer （BIET）, shaking table tests on a steel frame model （BIET system） with scale of 1：4 were conducted and the results were compared with the lead rubber beating （LRB） isolation system for the same model. Then numerical analysis of the system was carried out, in which the improved Wen analytic model was used to simulate the hysteretic law of transducers. The results show that the structural system can transform the partial earthquake energy to hydraulic energy ; furthermore, the effect of structural control can reach or be close to that of the LRB isolation system. The agreements between numerical analysis results and those of shaking table tests demonstrate the accuracy of the numerical model.展开更多
文摘镇旬矿田属秦岭泥盆系铅锌一菱铁矿带,矿化在空间上分布于乾佑河南北向古断陷的两侧,产生于泥盆纪.铅锌矿化特征与凤太矿田的诸矿床及西成矿田的毕家山、邓家山等矿床相似.铅同位素组成是均匀的,模式年令略老于含矿地层年令,硫化物的硫同位素组成为海水硫酸盐型.矿体有沉积似层状和交代不规则状两种形态,主要围岩蚀变为硅化和铁白云石化.矿化与生物灰岩有密切空间和成因联系.因而说镇旬矿田与矿带中其余三个矿田的铅锌矿有相同的成因,成矿模式类似于E. D. Large(1981)和M. J. Russell(1983)提出的喷流成矿模式.
文摘Engine noise source identification is essential for making noise reduction strategies.Predominant noise sources of engines are normally identified as some cover components such as oil pan, valve cover and front gear cover etc. The radiated noise sources of a 6-cylinder construction diesel engine are identified with two methods-lead covering technique and surface vibration technique,and the ranking of the major cover on the basis of acoustic power is presented in this paper. Firstly the sound power level of these cover components and their contributions to the total acoustic power are determined with lead covering method under hemi-anechoic condition. Then the vibration characteristics of these components are investigated. The sound power level of various components is predicted via the mean square area average vibration. Both results basically agree well and verify the effectiveness of both techniques in engineering field.
基金Project(41171361) supported by the National Natural Science Foundation of China
文摘The risk assessment right from the source of emissions can effectively guide the pollution control. A model was established, consisting of four part： source estimation, environmental fate analysis, exposure analysis and risk assessment. The human health risk, ecological risk and total risk of lead emissions were assessed. The factors were estimated to indicate the environmental decrease and exposure probability. Of all the 1887 t emissions in China in 2010（quantified in the previous work）, it is turned out 1.3 t reached human bodies（0.9 mg/ca）, and 2.7 t reached the ecosystem. Lead mainly came from the Use stage for the source while lead causing risk mainly came from the Waste Management Recycling and Production stages. As for chemical forms, PbO contributed most to the human health risk and PbSO_4 contributed most to the ecological risk. PbSO_4, PbO and Pb altogether contributed 71% to the total risk, indicating these three chemicals should be taken priority for the risk management.
基金Project(41202051)supported by the National Natural Science Foundation of ChinaProject(S2014GK3005)supported by Hunan Industrial Science and Technology Support Program+1 种基金Project(2012M521721)supported by China Postdoctoral Science FoundationProject(CSUZC2013021)supported by the Open-end Fund for the Valuable and Precision Instruments of Central South University,China
文摘For revealing the ore sources of the Dachang tin?polymetallic ore deposit, the lead isotopes were analyzed systematically by using the single minerals of sulphides, including pyrite, pyrrhotite, sphalerite, and galena. Then, the mineral sources and their characteristics were discussed based on the classical lead isotope discriminating model. The results show that the lead isotope ratios of206Pb/204Pb,207Pb/204Pb, and208Pb/204Pb range from 17.478 to 18.638, 15.440 to 15.858, and 37.556 to 39.501, respectively. According to Zartman lead model, the ore lead contains the upper crust composition; however, the granite does not provide all ore leads, and other material sources exist. Obviously, the ore deposit belongs to the result of the combined effect of crust?mantle. The source rocks are characterized by a certain degree of similarity with the island arc material. Moreover, its distant origin in the upper and lower crusts may be related to the subduction island arc material or oceanic crust. The mantle-derived material may have a certain status in the source region. Meanwhile, based on the lead isotope three-dimensional topology projection vectors, the ore leads are concentrated in zoneA, which indicates the characteristics of Yangtze lead isotope province and a possible genetic relationship with Yangtze block.
基金Supported by Qingdao Special Program for Outstanding Scientists (No.04-3-JJ-03), the "100 Talents Program" of the Chinese Academy of Sciences (CAS), the Knowledge Innovation Program of CAS (Nos. KZCX1-SW-01-08 and KZCX3-SW-214) and the NSF for Outstanding Young Scientists (Nos. 49925614 and 49725612), and the NSF of Shan-dong Province (No. H74990247).
文摘Sedimentation of fine-grained deposits on coastal zones and continental shelves are important because of the association with chemical pollutants, and the implication to the impact on biological processes, the stratigraphic correlations, and changes in sedimentary environments. The Yellow Sea continental shelf receives large quantities of sediment from the Huanghe （Yellow） River. Unfortunately, little attention has been yet paid to the sedimentation on the shallow shelf and its features, and the vertical sediment flux in the area is poorly understood. In this study, nine cores were collected in northern Yellow Sea by the R/V Science 1 in September, 1998 and 1999 to examine the sedimentation rate, sediment flux and the provenance with ^210Pb analysis. The 2^210Pb activity profiles showed that the vertical sediment flux ranged from 0.06 to 1.18 g/cm^2·a in the region. In central part of the area, there was a patch of fine-grained mud, with the flux below 0.33 g/cm^2·a. Most profiles were featured in two-segment model. Differences in the profiles reflected spatial and temporal variations in hydrodynamic and sedimentary processes. In order to determine the provenance and sedimentary setting in the area, the geochemistry of Ca, Fe, Sr, Cu, Ti and Rb in 11 surficial sediment samples were studied, which showed that in the central northern Yellow Sea, the mud deposit was from multi-source but mainly from the Huanghe River.
基金Funded by Key Laboratory of Marine Spill Oil Identification and Damage Assessment Technology, SOA, the Director’s Foundation of the Beihai Monitoring Center, the State Oceanic Administrationa Project of Chinese Academy of Science (KZCX 2-207)
文摘The trends of distribution,translocation and seasonal change of heavy metal Pb were studied based on the surface and bottom water sampling in Jiaozhou Bay in 1979,and compared with those in 1990's.The results showed that the source of Pb in the bay was from wastewater and sewage in the east of Jiaozhou Bay from ocean vessels.Pb concentration was higher in spring and lower in summer and autumn,and remained stable through sedimentation in the bottom layer.The overall water quality was good in 1970's.Compared with the environmental monitoring data of 1995-1999,Pb pollution had become serious.Therefore,more efforts should be made to protect the bay from Pb pollution.
基金Sponsored by the Hebei Scientific and Technological Research and Development Plans (Grant No.07215615)
文摘In order to evaluate the effects of structural control and energy transition for the base-isolation with energy transducer （BIET）, shaking table tests on a steel frame model （BIET system） with scale of 1：4 were conducted and the results were compared with the lead rubber beating （LRB） isolation system for the same model. Then numerical analysis of the system was carried out, in which the improved Wen analytic model was used to simulate the hysteretic law of transducers. The results show that the structural system can transform the partial earthquake energy to hydraulic energy ; furthermore, the effect of structural control can reach or be close to that of the LRB isolation system. The agreements between numerical analysis results and those of shaking table tests demonstrate the accuracy of the numerical model.
