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Ultrasonic method for measuring water holdup of low velocity and high-water-cut oil-water two-phase flow 被引量:2
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作者 赵安 韩云峰 +2 位作者 任英玉 翟路生 金宁德 《Applied Geophysics》 SCIE CSCD 2016年第1期179-193,222,共16页
Oil reservoirs with low permeability and porosity that are in the middle and late exploitation periods in China's onshore oil fields are mostly in the high-water-cut production stage.This stage is associated with sev... Oil reservoirs with low permeability and porosity that are in the middle and late exploitation periods in China's onshore oil fields are mostly in the high-water-cut production stage.This stage is associated with severely non-uniform local-velocity flow profiles and dispersed-phase concentration(of oil droplets) in oil-water two-phase flow,which makes it difficult to measure water holdup in oil wells.In this study,we use an ultrasonic method based on a transmission-type sensor in oil-water two-phase flow to measure water holdup in lowvelocity and high water-cut conditions.First,we optimize the excitation frequency of the ultrasonic sensor by calculating the sensitivity of the ultrasonic field using the finite element method for multiphysics coupling.Then we calculate the change trend of sound pressure level attenuation ratio with the increase in oil holdup to verify the feasibility of the employed diameter for the ultrasonic sensor.Based on the results,we then investigate the effects of oildroplet diameter and distribution on the ultrasonic field.To further understand the measurement characteristics of the ultrasonic sensor,we perform a flow loop test on vertical upward oilwater two-phase flow and measure the responses of the optimized ultrasonic sensor.The results show that the ultrasonic sensor yields poor resolution for a dispersed oil slug in water flow(D OS/W flow),but the resolution is favorable for dispersed oil in water flow(D O/W flow) and very fine dispersed oil in water flow(VFD O/W flow).This research demonstrates the potential application of a pulsed-transmission ultrasonic method for measuring the fraction of individual components in oil-water two-phase flow with a low mixture velocity and high water cut. 展开更多
关键词 Oil-water two-phase flow low mixture velocity high water cut ultrasonic sensor water holdup
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Tidal Analysis of High and Low Water Data
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作者 LIPeiliang LILei +2 位作者 ZUOJuncheng ZHAOWei CHENZongyong 《Journal of Ocean University of China》 SCIE CAS 2004年第1期10-16,共7页
The harmonic analysis method based on high and low water levels is discussed in this paper. In order to make full use of the information of high and low water observations (the time derivative of water level at the ob... The harmonic analysis method based on high and low water levels is discussed in this paper. In order to make full use of the information of high and low water observations (the time derivative of water level at the observation time is zero), the weight coefficient, w, is introduced to control the importance of the part related to this information in the error formula. The major diurnal constituents, O 1 and K 1, and semi diurnal constituents, N 2, M 2 and S 2 are selected directly from the monthly data analysis, and some other important constituents, P 1, ν 2 and K 2, are included as the inferred constituents. The obtained harmonic constants of the major constituents are very close to those obtained from the analysis of hourly data, and this shows that high and low water data can be used to extract tidal constants with high accuracy. The analysis result also shows that the inference and the weighting coefficient are important in the high and low water data analysis, and it is suggested that w ≥1 should be taken in monthly high and low water data analysis. This analysis method can be used directly to analyze altimetric data with w =0. 展开更多
关键词 tidal analysis high and low water data altimetric data
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Research and Application of an Environmental-Friendly Low-Damage and High Salt-Resistance Slick Water Fracturing Fluid System 被引量:2
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作者 Qingwen Zeng Peng Fu +3 位作者 Lei Meng Hua Shi Hong Zhou Weichu Yu 《Open Journal of Yangtze Oil and Gas》 2020年第3期131-143,共13页
The Sulige gas field is a typical low-pressure low-permeability tight sandstone gas reservoir. The reservoir has poor seepage capacity, strong heterogeneity, high mineralization of formation water and extremely scarce... The Sulige gas field is a typical low-pressure low-permeability tight sandstone gas reservoir. The reservoir has poor seepage capacity, strong heterogeneity, high mineralization of formation water and extremely scarce water resources on the site. These unfavorable factors have brought great difficulties to the on-site mining process. Now, a nano-composite green environmental protection slick water fracturing fluid system CQFR can be quickly dissolved because of the larger specific surface area, and the small molecular size makes the damage to the reservoir less than 5%, and the average drag reduction effect can reach more than 73%. It can quickly and well dissolve and maintain performance under high salinity conditions and fracturing flowback fluids. It responds well to the complex reservoir conditions on the construction site and makes the flowback fluid recyable, which greatly reduces the consumption of water resources on the construction site and effectively improves the construction efficiency and economic benefits. 展开更多
关键词 Tight Sandstone Recyclable Backwater Green Environmentally Friendly low-Damage high Salt-Resistance Slick water
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Study on the Monitoring Malfunction of Water Pollution during Drought or Flood Period and Low-carbon and High-value Methodology--A Case Study of the Correlation Test of Water,Soil and Gas Pollution in Xiangxiang County
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作者 LI Jin-song LI Lin-jie 《Meteorological and Environmental Research》 CAS 2011年第8期67-73,共7页
Based on the low-carbon and high-value methodology of chemical ecology and chemical informatics,combining theory and methods,taking saving,environmental protection,low carbon,high production,high value and circulation... Based on the low-carbon and high-value methodology of chemical ecology and chemical informatics,combining theory and methods,taking saving,environmental protection,low carbon,high production,high value and circulation as values and aims,the relationship between human and land as a basis,ecosystem as a center,overall control as a goal and agricultural ecological engineering as a mean,environmental pollution detection,as one of bottlenecks for agricultural products and food security,should be solved firstly;through the field survey in dry years from 2009 to 2010 when drought and flood were frequent and the frequency of drought was higher than that of flood,plus the determination of surface water flow and water quantity in a small typical river basin,the correlation of local water,soil and gas in the county could be found,and the transfer of monitoring focus from water environment to atmospheric environment was possible and necessary.The study would promote the quantitative research on the correlation among water,soil and gas,and the results were in accordance with the conclusions of related studies. 展开更多
关键词 Pollution monitoring REPRESENTATIVE Accuracy Correlation among water soil and gas data low-carbon and high-value methodology China
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Characteristics of the Correlation between Regional Water Vapor Transport along with the Convective Action and Variation of the Pacific Subtropical High in 1998 被引量:1
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作者 徐祥德 周丽 +1 位作者 张胜军 苗秋菊 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2003年第2期269-284,共16页
This paper explores the impact of the convective action over the low-latitude region, the water vapor transport around the West Pacific subtropical high (WPSH), and its convective action on the seasonal northward jump... This paper explores the impact of the convective action over the low-latitude region, the water vapor transport around the West Pacific subtropical high (WPSH), and its convective action on the seasonal northward jump and southward withdrawal of the WPSH in summer by using the daily data set of NCEP and TBB for 1998. The research shows that in summer, the WPSH moves northward when the convection over the low-latitude tropical region intensifies and the subsidence region of the meridional vertically vertical circulation in meridional direction circulation over the region of 110?150癊 moves northward. Furthermore, as revealed by diagnostic analysis, the subtropical high moves northward after the obvious weakening of the longitudinal water vapor transport over the region around the subtropical high, but withdraws southward a pentad after the reduction of the latitudinal water vapor transport over the tropical West Pacific region. The research results show that the northward jump and southward withdrawal of the WPSH are closely related to the release of the convective latent heat at low latitudes and the water vapor transport at boundaries around WPSH and its convective action. The numerical simulation further validates the above-mentioned correlation between the variation of the action of the subtropical high and the preceding water vapor transport along with the convection characteristics. 展开更多
关键词 West Pacific subtropical high seasonal northward jump and southward withdrawal convec-tion over low-latitudes water vapor transport
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Effect of High Frequency Oscillatory Ventilation on EVLW and Lung Capillary Permeability of Piglets with Acute Respiratory Distress Syndrome Caused by Pulmonary and Extrapulmonary Insults 被引量:8
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作者 李秋杰 袁茵 +2 位作者 李玉梅 孙乐英 袁世荧 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2015年第1期93-98,共6页
The effect of high frequency oscillatory ventilation(HFOV) at early stage on hemodynamic parameters, extravascular lung water(EVLW), lung capillary permeability, CC16 and s ICAM-1 in piglets with pulmonary or extr... The effect of high frequency oscillatory ventilation(HFOV) at early stage on hemodynamic parameters, extravascular lung water(EVLW), lung capillary permeability, CC16 and s ICAM-1 in piglets with pulmonary or extrapulmonary acute respiratory distress syndrome(ARDS) was explored. Central vein pressure(CVP) and pulse indicator continuous cardiac output(Pi CCO) were monitored in 12 anesthetized and intubated healthy piglets. Pulmonary ARDS(ARDSp) and extrapulmonary ARDS(ARDSexp) models were respectively established by lung lavage of saline solution and intravenous injection of oleic acid. Then the piglets received HFOV for 4 h. EVLW index(EVLWI), EVLW/intratroracic blood volume(ITBV) and pulmonary vascular permeability index(PVPI) were measured before and after modeling(T0 and T1), and T2(1 h), T3(2 h), T4(3 h) and T5(4 h) after HFOV. CC16 and s ICAM-1 were also detected at T1 and T5. Results showed at T1, T3, T4 and T5, EVLWI was increased more significantly in ARDSp group than in ARDSexp group(P〈0.05). The EVLWI in ARDSp group was increased at T1(P=0.008), and sustained continuously within 2 h(P=0.679, P=0.216), but decreased at T4(P=0.007) and T5(P=0.037). The EVLWI in ARDSexp group was also increased at T1(P=0.003), but significantly decreased at T3(P=0.002) and T4(P=0.019). PVPI was increased after modeling in both two groups(P=0.004, P=0.012), but there was no significant change within 4 h(T5) under HFOV in ARDSp group, while PVPI showed the increasing trends at first, then decreased in ARDSexp group after HFOV. The changes of EVLW/ITBV were similar to those of PVPI. No significant differences were found in ΔEVLWI(P=0.13), ΔPVPI(P=0.28) and ΔEVLW/ITBV between the two groups(P=0.63). The significant decreases in both CC16 and s ICAM-1 were found in both two groups 4 h after HFOV, but there was no significant difference between the two groups. It was concluded that EVLWI and lung capillary permeability were markedly increased in ARDSp and ARDSexp groups. EVLW could be decreased 4 h after the HFOV treatment. HFOV, EVLW/ITBV and PVPI were increased slightly at first, and then decreased in ARDSexp group, while in ARDSp group no significant difference was found after modeling. No significant differences were found in the decreases in EVLW and lung capillary permeability 4 h after HFOV. 展开更多
关键词 acute respiratory distress syndrome high frequency oscillatory ventilation extravascular lung water lung vascular permeability index CC16 s ICAM-1
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A high salt tolerance and low adsorption drag reducer based on non-covalent enhancement 被引量:1
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作者 MA Yingxian ZHU Zhi +4 位作者 GUO Jianchun ZHOU Han LI Jia XIONG Yujia MA Leyao 《Petroleum Exploration and Development》 2020年第6期1333-1341,共9页
To formulate fluids with flowback water,produced water directly to improve the utilization rate of recycling and reduce the adsorption damage of slick water to reservoirs,a high salt tolerance and low adsorption drag ... To formulate fluids with flowback water,produced water directly to improve the utilization rate of recycling and reduce the adsorption damage of slick water to reservoirs,a high salt tolerance and low adsorption drag reducer was designed and prepared by introducing polar cation fragments to enhance the non-covalent interactions between the chains.The drag reducer was characterized by IR and NMR.Friction resistance and viscosity tests were conducted to evaluate its salt resistance property.Static adsorption and dynamic adsorption retention tests were carried out to evaluate the damage of this reducer to shale reservoirs.The introduction of cation units into the molecular structure can weak the shielding effect of metal cations to some extent,so the drag reducer can keep a stable molecular structure and good resistant reducing performance under high salinity.The enhancement of non-covalent interaction between chains decreased the free polarity sites,further reduced the possibility of hydrogen bonding between drag reducer molecules and shale.In high salinity condition,both the adsorption capacity of the drag reducer on the shale surface and the average damage rate to the core permeability are low.Compared with the conventional salt-tolerant system,the overall liquid cost was reduced by 17%and the production per well increased by 44%.The application of this slick water system has achieved remarkable results. 展开更多
关键词 SHALE hydraulic fracturing slick water drag reducer low adsorption high salt tolerance
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Very Low Power,Low Voltage,High Accuracy,and High Performance Current Mirror
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作者 Hassan Faraji Baghtash Khalil Monfaredi Ahmad Ayatollahi 《Journal of Electronic Science and Technology》 CAS 2011年第3期211-215,共5页
A novel low power and low voltage current mirror with a very low current copy error is presented and the principle of its operation is discussed. In this circuit, the gain boosting regulated cascode scheme is used to ... A novel low power and low voltage current mirror with a very low current copy error is presented and the principle of its operation is discussed. In this circuit, the gain boosting regulated cascode scheme is used to improve the output resistance, while using inverter as an amplifier. The simulation results with HSPICE in TSMC 0.18 μm CMOS technology are given, which verify the high performance of the proposed structure. Simulation results show an input resistance of 0.014 Ω and an output resistance of 3 GΩ. The current copy error is favorable as low as 0.002% together with an input (the minimum input voltage of Vin,min- 0.24 V) and an output (the minimum output voltage of Vout,min~ 0.16 V) compliances while working with the 1 V power supply and the 50 μA input current. The current copy error is near zero at the input current of 27 μA. It consumes only 76μW and introduces a very low output offset current of 50 pA. 展开更多
关键词 index Terms--Current mirror/source high accurate high output resistance low power low voltage.
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Development and application of multi-field coupled high-pressure triaxial apparatus for soil
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作者 Xiu-yan Wang Lin Sun +6 位作者 Shuai-wei Wang Ming-yu Wang Jin-qiu Li Wei-chao Sun Jing-jing Wang Xi Zhu He Di 《Journal of Groundwater Science and Engineering》 2023年第3期308-316,共9页
The increasing severity of ground subsidence,ground fissure and other disasters caused by the excessive exploitation of deep underground resources has highlighted the pressing need for effective management.A significa... The increasing severity of ground subsidence,ground fissure and other disasters caused by the excessive exploitation of deep underground resources has highlighted the pressing need for effective management.A significant contributing factor to the challenges faced is the inadequacy of existing soil mechanics experimental instruments in providing effective indicators,creating a bottleneck in comprehensively understanding the mechanisms of land subsidence.It is urgent to develop a multi-field and multi-functional soil mechanics experimental system to address this issue.Based soil mechanics theories,the existing manufacturing capabilities of triaxial apparatus and the practical demands of the test system,a set of multi-field coupled high-pressure triaxial system is developed tailored for testing deep soils(at depths of approximately 3000 m)and soft rock.This system incorporates specialized design elements such as high-pressure chamber and horizontal deformation testing devices.In addition to the conventional triaxial tester functions,its distinctive feature encompass a horizontal deformation tracking measuring device,a water release testing device and temperature control device for the sample.This ensemble facilitates testing of horizontal and vertical deformation water release and other parameters of samples under a specified stress conditions,at constant or varying temperature ranging from-40℃–90℃.The accuracy of the tested parameters meets the requirements of relevant current specifications.The test system not only provides scientifically robust data for revealing the deformation and failure mechanism of soil subjected to extreme temperature,but also offers critical data support for major engineering projects,deep exploration and mitigation efforts related to soil deformation-induced disaster. 展开更多
关键词 Multi-field coupled triaxial test high and low temperature Horizontal deformation Compressed water release
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Application Layer Multicast Model with Low Delay and High Stability
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作者 廖小飞 宣益亮 +1 位作者 宿轩策 李德敏 《Journal of Donghua University(English Edition)》 CAS 2023年第1期74-79,共6页
As an alternative of Internet protocol(IP)multicast,application layer multicast(ALM)is widely used with the advantage of simplicity and flexibility.However,the existing problems of large transmission delay and poor st... As an alternative of Internet protocol(IP)multicast,application layer multicast(ALM)is widely used with the advantage of simplicity and flexibility.However,the existing problems of large transmission delay and poor stability limit the application and development.In this article,to solve these problems,an ALM model based on node potential(NP)and topological index(TI)is proposed.The proposed model considers the factors of node capability and node distance in constructing and maintaining multicast tree to reduce transmission delay and increase stability,and thus it improves the application level in real-time multimedia multicast.The computer simulations prove that the proposed model reduces the ALM transmission delay,increases multicast tree stability effectively,and improves the ALM performance,and therefore it is suitable to apply in large-scale real-time multimedia environment. 展开更多
关键词 application layer multicast(ALM) high stability low delay node potential(NP) topological index(TI)
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Regression Relationship between WI and FMC at Different Growth Periods of Sawtooth Oaks Leaf 被引量:2
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作者 费鲜芸 张志国 +2 位作者 卢霞 高祥伟 何润昭 《Agricultural Science & Technology》 CAS 2010年第7期49-52,共4页
[Objective] The aim was to study the regression relationship between water index (WI) and fuel moisture content (FMC) of different growth periods of sawtooth oaks leaf.[Method] Taking sawtooth oaks in Huaguo Mount... [Objective] The aim was to study the regression relationship between water index (WI) and fuel moisture content (FMC) of different growth periods of sawtooth oaks leaf.[Method] Taking sawtooth oaks in Huaguo Mountain,Lianyungang City as research object,the sensitivity of WI to leaf FMC was studied at leaf level,and statistical characteristics were analyzed.[Result] The WI of sawtooth oaks leaves was sensitive to the changes of FMC,and the line regression level between them was significant.A fitting curve between leaf FMC and WI was obtained.[Conclusion] The research provides reference for acquisition methods of vegetation water remote sensing within the range of study area. 展开更多
关键词 high spectral Fuel moisture index water content Regression analysis Swatooth oaks leaf
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Localized CdS homojunctions with optimal ratio of high and low index facets to dynamically boost H_(2)O splitting into H_(2)energy
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作者 Xiaojun Wang Yiqi Zhang +2 位作者 Shujuan Jiang Jiakun Su Shaoqing Song 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第4期94-100,共7页
Localized CdS homojunctions with optimal ratio of high and low index facets are constructed to dy-namically boost H_(2)O splitting into H_(2)energy by hydrothermal method in combination with calcination.By density fun... Localized CdS homojunctions with optimal ratio of high and low index facets are constructed to dy-namically boost H_(2)O splitting into H_(2)energy by hydrothermal method in combination with calcination.By density functional theory,hall effect,and in situ diffuse reflectance infrared Fourier transform spec-troscopy,it is revealed that photo-irradiated e^(−)and h^(+)can be spatially separated and directionally trans-ferred to the reductive high-index facet{002}and oxidative low-index facet{110}of localized CdS homo-junction induced by Fermi level difference of both high and low index facets to dehydrogenate ^(∗)-OH and coupled ^(∗)-O intermediates for H_(2)and O_(2)yield,respectively,along with a solar conversion into hydrogen of 1.93%by AM 1.5 G irradiation at 65℃.The study work suggests a scientific perspective on the optimal ratio of high and low index facets to understand photo-generated charge carrier transfer dynamically and their photocatalytic principle for H_(2)O splitting reaction in kinetics. 展开更多
关键词 Photocatalytic H_(2)evolution Homojunction Localized field Ratio of high low index facets In-situ DRIFTS
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Prevalence of Abnormity of Blood Lipid and Associated Factors in Health Examination Population in Beijing 被引量:2
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作者 Wei-ming Kang Jie-shi Zhang Xin-xin Liu Min-shan Wang Ming-li Zhao Jian-chun Yu 《Chinese Medical Sciences Journal》 CAS CSCD 2009年第3期142-146,共5页
Objective To investigate the prevalence of abnormity of blood lipid and associated factors in healthy population in Beijing. Methods Totally, 38 462 individuals who received health examination were enrolled in our stu... Objective To investigate the prevalence of abnormity of blood lipid and associated factors in healthy population in Beijing. Methods Totally, 38 462 individuals who received health examination were enrolled in our study. We divided them into eight groups according to their ages. The levels of serum total cholesterol, triglyceride, high density lipoprotein cholesterol, and low density lipoprotein cholesterol were tested, and the relationship of blood lipid abnormity with body mass index (BMI) and fasting blood glucose was analyzed. Results The incidences of hypercholesterolemia, hyperglyceridemia, low high-density lipoprotein cholesterolemia, and hyper low-density lipoprotein cholesterolemia presented increasing trend in this population. The incidence rate of abnormity of blood lipid in health examination population increased with BMI increase. The incidence of abnormity of blood lipid in overweight and obesity population was significantly higher than that in low weight and normal weight populations (P<0.05). Meanwhile, the trend of abnormal blood lipid incidence coincided with that of abnormal fasting blood glucose. Conclusions The prevalence of overweight, obesity, and abnormity of blood lipid in Beijing presents increasing trend. The incidence of abnormity of blood lipid increases with BMI increase, in coincidence with that of fasting blood glucose. 展开更多
关键词 body mass index total cholesterol TRIGLYCERIDE high density lipoprotein cholesterol low density lipoprotein cholesterol fasting blood glucose
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Ankle-brachial index and brachial-ankle pulse wave velocity are risk factors for ischemic stroke in patients with type 2 diabetes 被引量:5
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作者 Ting Li Xiu-juan Wu +3 位作者 Xiao-min Chen Si-bo Wang Kang-ding Liu Ying-qi Xing 《Neural Regeneration Research》 SCIE CAS CSCD 2017年第11期1853-1859,共7页
The incidence of ischemic stroke in patients with diabetes is increasing. While brachial-ankle pulse wave velocity (BaPWV) and ankle-bra- chial index (ABI) are known to be associated with ischemic cardiovascular a... The incidence of ischemic stroke in patients with diabetes is increasing. While brachial-ankle pulse wave velocity (BaPWV) and ankle-bra- chial index (ABI) are known to be associated with ischemic cardiovascular and cerebrovascular diseases, whether these measures predict the risk of ischemic cerebrovascular disease in diabetic patients remains unclear. 117 patients with type 2 diabetes were enrolled in this study. According to the results of head magnetic resonance imaging, the patients were divided into a diabetes-only group (n = 55) and a diabetes and ischemic stroke group (n = 62). We then performed ABI and BaPWV examinations for all patients. Compared with the diabe- tes-only group, we found decreased ABI and increased BaPWV in the diabetes and ischemic stroke group. Multivariate logistic regression analyses revealed that BaPWV and ABI were risk factors for ischemic stroke in patients with type 2 diabetes. Our findings indicate that decreased ABI and increased BaPWV are objective indicators of increased risk of ischemic stroke in patients with type 2 diabetes. 展开更多
关键词 nerve regeneration brain injury ischemic stroke type 2 diabetes ankle-brachial index brachial-ankle pulse wave velocity magnetic resonance imaging low-density lipoprotein high-density lipoprotein transcranial Doppler ultrasonography carotid ultrasound scans neural regeneration
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Classification of the Index Sets of Low[n]~p and High [n]~p
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作者 眭跃飞 《Journal of Computer Science & Technology》 SCIE EI CSCD 1991年第3期285-290,共6页
In this paper we will first give the characterization of the p^-low p^-degree,and prove that a p.r.e. degree(?)contains a p^-speedable set A if and only if(?)′>P(?)′.Then we classify the index sets of Low[n]~p an... In this paper we will first give the characterization of the p^-low p^-degree,and prove that a p.r.e. degree(?)contains a p^-speedable set A if and only if(?)′>P(?)′.Then we classify the index sets of Low[n]~p and High[n]~p and prove that Low [n]~p is Σ~P[n+3]-complete and High [n]~p is Σ~P [n+4]-complete. 展开更多
关键词 Classification of the index Sets of low[n p and high
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Analysis of An Infrequent Regional Heavy Rainfall Weather Process in Heilongjiang Province in June of 2009 被引量:1
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作者 吴英 张杰 闫中帅 《Meteorological and Environmental Research》 CAS 2010年第10期29-32,共4页
From June 18th to June 19th of 2009,Heilongjiang Province was hit by the regional rainstorm rarely paralleled in history.According to the findings based upon the conventional observation data,the precipitation occurre... From June 18th to June 19th of 2009,Heilongjiang Province was hit by the regional rainstorm rarely paralleled in history.According to the findings based upon the conventional observation data,the precipitation occurred under the double-blocking situation of Ural Mountains and the Sea of Okhotsk.The main influencing systems were the upper vortex and northward low-pressure that came from Hetao area,accompanied by the delivery of high and low level jet stream.The results showed that the evolvement of blocking high,transfer of water vapor and configuration of high and low level jet stream were the key factors resulting in the rainfall process. 展开更多
关键词 Blocking high water vapour transport high and low level jet stream China
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Analysis of the Microphysical Structure of Heavy Fog Using a Droplet Spectrometer:A Case Study 被引量:35
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作者 牛生杰 陆春松 +3 位作者 刘延刚 赵丽娟 吕晶晶 杨军 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2010年第6期1259-1275,共17页
The microphysical properties of a long-lasting heavy fog event are examined based on the results from a comprehensive field campaign conducted during the winter of 2006 at Pancheng (32.2°N, 118.7°E), Jiang... The microphysical properties of a long-lasting heavy fog event are examined based on the results from a comprehensive field campaign conducted during the winter of 2006 at Pancheng (32.2°N, 118.7°E), Jiangsu Province, China. It is demonstrated that the key microphysical properties (liquid water content, fog droplet concentration, mean radius and standard deviation) exhibited positive correlations with one another in general, and that the 5-min-average maximum value of fog liquid water content was sometimes greater than 0.5 g m-3. Further analysis shows that the unique combination of positive correlations likely arose from the simultaneous supply of moist air and fog condensation nuclei associated with the advection of warm air, which further led to high liquid water content. High values of liquid water content and droplet concentration conspired to cause low visibility (〈50 m) for a prolonged period of about 40 h. Examination of the microphysical relationships conditioned by the corresponding autoconversion threshold functions shows that the collision-coalescence process was sometimes likely to occur, weakening the positive correlations induced by droplet activation and condensational growth. Statistical analysis shows that the observed droplet size distribution can be described well by the Gamma distribution. 展开更多
关键词 fog microphysics positive correlation high liquid water content low visibility warm and moistair
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OFA-Ⅱ定量荧光仪及其应用 被引量:7
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作者 沈卫宏 《石油仪器》 2003年第3期40-42,62,共3页
定量荧光录井对发现油显示 ,尤其是轻质油显示有着独到的作用。在室内实验和现场分析的基础上 ,文章对江苏油田不同断块、不同层位的储集层中不同性质的原油进行定量荧光分析 ,将荧光谱图中主峰波长、主峰荧光强度、油性指数确定为荧光... 定量荧光录井对发现油显示 ,尤其是轻质油显示有着独到的作用。在室内实验和现场分析的基础上 ,文章对江苏油田不同断块、不同层位的储集层中不同性质的原油进行定量荧光分析 ,将荧光谱图中主峰波长、主峰荧光强度、油性指数确定为荧光谱图特征值。利用这些参数可发现储集层中不同性质的油显示及对储集层流体性质进行评价。 展开更多
关键词 0FA—Ⅱ定量荧光仪 原油分析 油水层 录井 主峰波长 荧光级别 油性指数
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FACTORS ON VISCOSITY STABILITY OF MOLD FLUXES
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作者 C.Y.Zhu C.J.Liu +1 位作者 M.F.Jiang Z.D.Yang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2004年第2期175-180,共6页
Viscosity stability indexes of mold flux at high temperature and low temperature havebeen introduced and the effects of flux compositions on viscosity stability indexeshave been studied. Two mold fluxes have been deve... Viscosity stability indexes of mold flux at high temperature and low temperature havebeen introduced and the effects of flux compositions on viscosity stability indexeshave been studied. Two mold fluxes have been developed by analyzing the effects offlux viscosity stability on the process and the condition of continuous casting slab ofmedium carbon steel. The results show that the fluxes are suitable for the process. 展开更多
关键词 mold flux viscosity stability index high temperature low temperature
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基于投影寻踪模型的特高含水油藏剩余油可采潜力评价方法 被引量:2
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作者 刘晨 冯其红 +2 位作者 何逸凡 张先敏 周文胜 《油气地质与采收率》 CAS CSCD 北大核心 2024年第1期137-144,共8页
影响特高含水油藏剩余油可采潜力的因素极其复杂,且各因素的影响程度差异明显,常规方法多以剩余油饱和度或剩余油储量丰度等单一指标评价剩余油潜力,难以有效指导特高含水油藏剩余油挖潜。在充分考虑特高含水油藏剩余油可采潜力影响因... 影响特高含水油藏剩余油可采潜力的因素极其复杂,且各因素的影响程度差异明显,常规方法多以剩余油饱和度或剩余油储量丰度等单一指标评价剩余油潜力,难以有效指导特高含水油藏剩余油挖潜。在充分考虑特高含水油藏剩余油可采潜力影响因素的基础上,综合表征储层非均质性、剩余油可采储量规模、水淹状况以及油水分流能力的差异,构建了特高含水油藏剩余油可采潜力量化评价指标体系,并考虑不同指标对剩余油可采潜力控制程度的差异,将加速遗传算法与投影寻踪模型相结合来确定各评价指标的客观权重,从而构建了剩余油可采潜力指数,形成特高含水油藏剩余油可采潜力量化评价新方法。以渤海Q油田南区主力产层NmIL砂体为例,开展特高含水油藏剩余油可采潜力量化评价,结果表明,新方法可综合表征不同区域位置的储层物性、可采储量丰度和油水分流能力对剩余油可采潜力的影响,实现了主力产层NmIL砂体剩余油可采潜力分布的差异化定量评价,优势可采潜力区域刻画明显,将其作为NmIL砂体下一步井网加密调整潜力区域,以精准指导加密水平井的部署,为特高含水油藏剩余油挖潜提供了一种全新的分析方法与思路。 展开更多
关键词 特高含水期 剩余油 可采潜力指数 投影寻踪 优势潜力丰度
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