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L^*上的“way-below”关系及其应用 被引量:1
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作者 李令强 金秋 赵海信 《井冈山大学学报(自然科学版)》 2011年第2期4-6,共3页
研究了直觉模糊集的真值域L*上的"way-below"关系,利用L*上的"way-below"关系,构造了[0,1]-拓扑范畴[0,1]-Top与oker意义下的直觉模糊拓扑范畴IFTop之间的一对伴随,并证明了[0,1]-Top可以嵌入IFTop作为余反射子... 研究了直觉模糊集的真值域L*上的"way-below"关系,利用L*上的"way-below"关系,构造了[0,1]-拓扑范畴[0,1]-Top与oker意义下的直觉模糊拓扑范畴IFTop之间的一对伴随,并证明了[0,1]-Top可以嵌入IFTop作为余反射子范畴。 展开更多
关键词 WAY-below关系 SCOTT拓扑 直觉模糊集 模糊拓扑
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伪补格上的弱Way-below关系
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作者 祝祯祯 卢涛 《洛阳师范学院学报》 2014年第5期17-18,共2页
本文首先给出伪补格的定义,然后根据偏序集上Way-below关系的定义在伪补格上定义了弱Waybelow关系,并给出它的等价判定,从而得到伪补格上满足弱Way-below关系的元素的相关性质.
关键词 伪补格 弱Way—below关系
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基于语料库对介词below的意象图式和空间隐喻分析
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作者 薛枝 齐弘佳 《江苏海洋大学学报(人文社会科学版)》 2022年第4期85-99,共15页
研究从语料库抽取语料,运用意象图式和空间隐喻理论分析语料,旨在揭示人们在使用介词below的空间含义时,体现了身体经验中的哪些意象图式结构;在使用介词below的抽象含义时,反映了认知中的哪些空间隐喻;以及介词below的意象图式和空间... 研究从语料库抽取语料,运用意象图式和空间隐喻理论分析语料,旨在揭示人们在使用介词below的空间含义时,体现了身体经验中的哪些意象图式结构;在使用介词below的抽象含义时,反映了认知中的哪些空间隐喻;以及介词below的意象图式和空间隐喻的分布情况。经分析发现,在使用介词below的空间含义时,体现的意象图式结构有“上下(无接触)”“上下(同载体)”“斜上斜下”“覆盖”“上下(无形界标)”“左右”;在使用介词below的抽象含义时,反映的空间隐喻有“标准为高度”“更多为上,更少为下”“表象为上,秘密为下”“地位低为方位低”。介词below空间隐喻分布比例大于意象图式,表明介词below被更多地用来表达抽象含义。本研究意义在于通过分析介词below的意象图式和空间隐喻,揭示人们使用介词below时的认知过程。 展开更多
关键词 below 语料库 意象图式 空间隐喻
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Fatigue Life Prediction under Service Load Considering Strengthening Effect of Loads below Fatigue Limit 被引量:5
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作者 ZHAO Lihui ZHENG Songlin FENG Jinzhi 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2014年第6期1178-1185,共8页
Lightweight design requires an accurate life prediction for structures and components under service loading histories. However, predicted life with the existing methods seems too conservative in some cases, leading to... Lightweight design requires an accurate life prediction for structures and components under service loading histories. However, predicted life with the existing methods seems too conservative in some cases, leading to a heavy structure. Because these methods are established on the basis that load cycles would only cause fatigue damage, ignore the strengthening effect of loads. Based on Palmgren-Miner Rule (PMR), this paper introduces a new method for fatigue life prediction under service loadings by taking into account the strengthening effect of loads below the fatigue limit. In this method, the service loadings are classified into three categories: damaging load, strengthening load and none-effect load, and the process for fatigue life prediction is divided into two stages: stage I and stage II, according to the best strengthening number of cycles. During stage I, fatigue damage is calculated considering both the strengthening and damaging effect of load cycles. While during stage II, only the damaging effect is considered. To validate this method, fatigue lives of automobile half shaft and torsion beam rear axle are calculated based on the new method and traditional methods, such as PMR and Modified Miner Rule (MMR), and fatigue tests of the two components are conducted under service loading histories. The tests results show that the percentage errors of the predicted life with the new method to mean life of tests for the two components are –3.78% and –1.76% separately, much lesser than that with PMR and MMR. By considering the strengthening effect of loads below the fatigue limit, the new method can significantly improve the accuracy for fatigue life prediction. Thus lightweight design can be fully realized in the design stage. 展开更多
关键词 fatigue life fatigue damage service loading strengthening effect load below the fatigue limit
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Role of the dressed and bound states on below-threshold harmonic generation of He atom 被引量:3
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作者 Jian-Wei Zhou Zhi-Hong Jiao +1 位作者 Peng-Cheng Li Xiao-Xin Zhou 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第10期192-197,共6页
High-order harmonic generation below ionization threshold of He atom in the laser field is investigated by solving the three-dimensional time-dependent Schrodinger equation. An angular momentum-dependent model potenti... High-order harmonic generation below ionization threshold of He atom in the laser field is investigated by solving the three-dimensional time-dependent Schrodinger equation. An angular momentum-dependent model potential of He atom was used for getting the accurate energy levels of singlet states. The satellite-peak structures of the below-threshold harmonic generation(BTHG) of He are observed. We analyze the emission properties of the BTHG by employing a synchrosqueezing transform technique. We find that the satellite-peak structures have two types related to two kinds of transitions. One is the transition of the dressed states of the excited states, the other is the transition between the excited states and the ground state in the field-free case. Furthermore, our results show that the maximum Stark shift of the 2 p state is about 0.9 Up(penderomotive energy), and that of the 4 p state is about 1.0 Up. It indicates that the energy difference between some satellite-and main-peaks of the BTHG can be used to measure the maximum Stark shift of the excited states of He atom in the laser field. 展开更多
关键词 harmonic generation below threshould IONIZATION DRESS state STARK SHIFT
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Similarity model tests of movement and deformation of coal-rock mass below stopes 被引量:6
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作者 WANG, Haifeng CHENG, Yuanping +1 位作者 YUAN, Liang WANG, Liang 《Mining Science and Technology》 EI CAS 2010年第2期188-192,共5页
For a study of the movement and deformation of coal-rock mass and low protected seams below a stope,as well as for fracture developments and rules of evolution of permeability,we designed a plane strain model test sta... For a study of the movement and deformation of coal-rock mass and low protected seams below a stope,as well as for fracture developments and rules of evolution of permeability,we designed a plane strain model test stand to carry out model tests of similar materials in order to improve the effect of gas drainage from low protected seams and to measure the movement and deformation of coal-rock mass using a method of non-contact close-range photogrammetry.Our results show that 1) using paraffin melting to take the place of coal seam mining can satisfy the mining conditions of a protective seam;2) coal-rock mass under goafs has an upward movement after the protective seam has been mined,causing floor heaving;3) low protected seams become swollen and deformed,providing a good pressure-relief effect and causing the coal-rock mass under both sides of coal pillars to become deformed by compression and 4) the evolution of permeability of low protected seams follows the way of initial values→a slight decrease→a great increase→stability→final decrease.Simultaneously,the coefficient of air permeability increased at a decreasing rate with an increase in interlayer spacing. 展开更多
关键词 coal-rock mass below stope low protected seam plane strain similar model test
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The Hyperspace of the Regions Below of Continuous Maps from the Converging Sequence 被引量:4
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作者 杨忠强 范玲玲 《Northeastern Mathematical Journal》 CSCD 2006年第1期46-54,共9页
Let S = {1,1/2,1/2^2,…,1/∞ = 0} and I = [0, 1] be the unit interval. We use ↓USC(S) and ↓C(S) to denote the families of the regions below of all upper semi-continuous maps and of the regions below of all conti... Let S = {1,1/2,1/2^2,…,1/∞ = 0} and I = [0, 1] be the unit interval. We use ↓USC(S) and ↓C(S) to denote the families of the regions below of all upper semi-continuous maps and of the regions below of all continuous maps from S to I and ↓C0(S) = {↓f∈↓C(S) : f(0) = 0}. ↓USC(S) endowed with the Vietoris topology is a topological space. A pair of topological spaces (X, Y) means that X is a topological space and Y is its subspace. Two pairs of topological spaces (X, Y) and (A, B) are called pair-homeomorphic (≈) if there exists a homeomorphism h : X→A from X onto A such that h(Y) = B. It is proved that, (↓USC(S),↓C0(S)) ≈(Q, s) and (↓USC(S),↓C(S)/ ↓C0(S))≈(Q, c0), where Q = [-1,1]^ω is the Hilbert cube and s = (-1,1)^ω,c0= {(xn)∈Q : limn→∞= 0}. But we do not know what (↓USC(S),↓C(S))is. 展开更多
关键词 regions below upper semi-continuity the Hilbert cube pseudo-interior strongly universal the converging sequence
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Below the Data Range Prediction of Soft Computing Wave Reflection of Semicircular Breakwater 被引量:1
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作者 Suman Kundapura Vittal Hegde Arkal Jose L.S.Pinho 《Journal of Marine Science and Application》 CSCD 2019年第2期167-175,共9页
Coastal defenses such as the breakwaters are important structures to maintain the navigation conditions in a harbor.The estimation of their hydrodynamic characteristics is conventionally done using physical models,sub... Coastal defenses such as the breakwaters are important structures to maintain the navigation conditions in a harbor.The estimation of their hydrodynamic characteristics is conventionally done using physical models,subjecting to higher costs and prolonged procedures.Soft computing methods prove to be useful tools,in cases where the data availability from physical models is limited.The present paper employs adaptive neuro-fuzzy inference system(ANFIS)and artificial neural network(ANN)models to the data obtained from physical model studies to develop a novel methodology to predict the reflection coefficient(Kr)of seaside perforated semicircular breakwaters under low wave heights,for which no physical model data is available.The prediction was done using the input parameters viz.,incident wave height(Hi),wave period(T),center-to-center spacing of perforations(S),diameter of perforations(D),radius of semicircular caisson(R),water depth(d),and semicircular breakwater structure height(hs).The study shows the prediction below the available data range of wave heights is possible by ANFIS and ANN models.However,the ANFIS performed better with R^2=0.9775 and the error reduced in comparison with the ANN model with R2=0.9751.Study includes conventional data segregation and prediction using ANN and ANFIS. 展开更多
关键词 Semicircular BREAKWATER Wave REFLECTION below the DATA RANGE Artificial neural network Adaptive NEURO-FUZZY INFERENCE system
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BOUNDEDNESS FROM BELOW OF MULTIPLICATION OPERATORS BETWEEN α-BLOCH SPACES ON THE UNIT BALL
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作者 张敏珠 《Acta Mathematica Scientia》 SCIE CSCD 2010年第5期1619-1630,共12页
In this article, we characterize the boundedness from below of multiplication operators between α-Bloch spaces on the unit ball.
关键词 unit ball α-Bloch space multiplication operator boundedness from below
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The research of below-cloud scavenging of rainwater in Guilin City
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作者 Bai Yuhua Yao Rongkui +1 位作者 Li Xin Tang Xiaoyan(The Department of Technical Physies and The Center of Environmental Science,Peking University, Beijing 100871, China) 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 1994年第3期322-329,共8页
Sequential samples of single precipitation event were collected by the use of specially de-signed semi-automatic sequential precipitation collector in the spring of 1988 in Guilin City. ThePH value and soluble chemica... Sequential samples of single precipitation event were collected by the use of specially de-signed semi-automatic sequential precipitation collector in the spring of 1988 in Guilin City. ThePH value and soluble chemical species such as SO, NO, NH, Ca ̄(2+), Mg ̄(2+), Na ̄+, K`+, F ̄- andCl ̄- were analyzed. An apparent decrease in the concentration of all ions except H ̄+ and NO wasobserved at the initial portion of the events. The relative acidity increased as the event progress.The concentration of H ̄+ was the result of comprehensive actions of all ions. The average scavengingratio of events was calculated and it is found that SO was the major contributor for acid rain inGuilin and Ca ̄(2+) was the important neutralizer. 展开更多
关键词 acid rain sequential sample below-cloud scavenging precipitation event.
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The Index of Invariant Subspaces of Bounded below Operators on Banach Spaces
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作者 George Chailos 《Advances in Pure Mathematics》 2012年第2期124-127,共4页
For an operator on a Banach space , let be the collection of all its invariant subspaces. We consider the index function on and we show, amongst others, that if is a bounded below operator and if , , then If in additi... For an operator on a Banach space , let be the collection of all its invariant subspaces. We consider the index function on and we show, amongst others, that if is a bounded below operator and if , , then If in addition are index 1 invariant subspaces of , with nonzero intersection, we show that . Furthermore, using the index function, we provide an example where for some , holds . 展开更多
关键词 INDEX Invariant SUBSPACES BOUNDED below OPERATORS BANACH SPACES
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Reporting Children’s Development below the Test Floor: Looking Back and Forth to Describe Individual Strengths and Needs
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作者 Elizabeth M. Green Louise A. Stroud 《Health》 CAS 2023年第2期122-133,共12页
The test floor effects seen in standardised tests lead to a standardised score of 1 or less with a flat profile that hides a child’s individual strengths and needs. The Griffiths III community of practitioners reques... The test floor effects seen in standardised tests lead to a standardised score of 1 or less with a flat profile that hides a child’s individual strengths and needs. The Griffiths III community of practitioners requested advice on the reporting of children’s development below the floor of the test, so that individual strengths and needs can be described. This paper reports the third phase of research following an earlier Scoping Review and a wider literature review. To confirm quality control, Phase 3 was conducted in a retrospective manner using the same methodology as the earlier phases but in a reverse direction. Peer reviewer comments and key elements from the Scoping Review and keywords from the publications were tabulated. Data analysis included a change of perspective to that of the child and their individual rights with respect to the literature themes already described in Phase 2. These confirmed that there is little specific guidance in the literature, but that computational advances for homogeneous populations and especially disaggregated data offer some solutions. A greater balance between broad biopsychosocial models and standardised models of assessment should be sought by practitioners together with the use of disaggregated data to highlight issues that pertain to individual subsets of results. This will ensure that the child’s right for their individual strengths and needs to be described together with a plan for management, may be met. 展开更多
关键词 Developmental Assessment Children with Severe Disability Disaggregated Data Pattern and Needs Identification below Test Floor
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Maximal Above and Below Pairs of Abelian Fully Ordered Groups
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作者 郑熙强 《Northeastern Mathematical Journal》 CSCD 2000年第4期445-450,共6页
In this paper, maximal above and below pairs of fully ordered groups (o groups) are studied. It is shown that maximal above and below pairs of an divisible abelian o group have some specific properties, and by using... In this paper, maximal above and below pairs of fully ordered groups (o groups) are studied. It is shown that maximal above and below pairs of an divisible abelian o group have some specific properties, and by using these properties another embedding method of an abelian o group to real valued functions is discussed. 展开更多
关键词 ordered group convex subgroup above and below subgroup
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Spare Parts Surgery—Salvage of a Below Knee Amputation Stump
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作者 Chasari Tancharoen Edmund Ek Anand Ramakrishnan 《Modern Plastic Surgery》 2012年第2期28-30,共3页
“Spare parts surgery” is well-described in the plastic surgery literature. In the setting of trauma, otherwise discarded parts can be utilized for reconstruction resulting in a superior functional and aesthetic outc... “Spare parts surgery” is well-described in the plastic surgery literature. In the setting of trauma, otherwise discarded parts can be utilized for reconstruction resulting in a superior functional and aesthetic outcome for the patient. We describe the use of spare part surgery in order to preserve a functional knee articulation in a patient undergoing amputation for compartment. 展开更多
关键词 below Knee AMPUTATION Free FLAP FILLET of SOLE FLAP Spare Part SURGERY
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Trend of <i>Cryptosporidium</i>Infection among Children below 24 Months in an Informal Urban Settlement, Kenya
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作者 Daisy Chepkemoi Mutai Patrick Opiyo Owili Miriam Adoyo Muga 《Open Journal of Medical Microbiology》 2020年第3期153-161,共9页
<i><span style="font-family:Verdana;">Cryptosporidium</span></i><span style="font-family:;" "=""><span style="font-family:Verdana;"> inf... <i><span style="font-family:Verdana;">Cryptosporidium</span></i><span style="font-family:;" "=""><span style="font-family:Verdana;"> infection is estimated to cause 2.9 million diarrheal cases yearly among children aged under 24 months in sub-Saharan Africa. Studies have shown long-term climatic variations can affect infectious diseases. The burden of cryptosporidiosis in rural areas of sub-Saharan Africa is well characterized. However, the trend of </span><i><span style="font-family:Verdana;">Cryptosporidium</span></i><span style="font-family:Verdana;"> infection is not known, especially in informal urban settings. This study therefore sought to determine cryptosporidiosis trends, and further explore the association between year and </span><i><span style="font-family:Verdana;">Cryptosporidium</span></i><span style="font-family:Verdana;"> infection among children below 24 months in Kibera urban informal settlement in Kenya. Data collected by the Kenya Medical Research Institute longitudinal study in Tabitha clinic in Kibera from 2009 to 2015 were used. At least 3000 children aged < 24 months receive free health care at the clinic. In the longitudinal study</span></span><span style="font-family:Verdana;">,</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> children presenting with diarrhea were eligible for stool sample collection (</span><i><span style="font-family:Verdana;">n</span></i><span style="font-family:Verdana;"> = 477), out of which 421 stool samples were tested using TaqMan</span><span style="font-family:Verdana;"><span style="white-space:nowrap;">&#8482;</span></span><span style="font-family:Verdana;"> Array Card (TAC) polymerase chain reaction panel that included a target for </span><i><span style="font-family:Verdana;">Cryptosporidium</span></i><span style="font-family:Verdana;"> genus. Data for the 421 children were included in the analysis. Logistic regression was used to explore the difference between the seven years and cryptosporidiosis. Overall, the pooled data indicated that 23.5% of the children who were tested had </span><i><span style="font-family:Verdana;">Cryptosporidium</span></i><span style="font-family:Verdana;"> infection, with the highest proportions of </span><i><span style="font-family:Verdana;">Cryptosporidium-</span></i><span style="font-family:Verdana;">positive cases observed in 2015 (45.2%). The logistic regression results also indicated that children who were tested in the year 2015 were more likely to have </span><i><span style="font-family:Verdana;">Cryptosporidium</span></i><span style="font-family:Verdana;"> infection (OR = 3.39;95% CI: 1.44 - 7.96;</span><i><span style="font-family:Verdana;">p</span></i><span style="font-family:Verdana;"> = 0.005) than those in 2009. Watery stool was also found to be an important symptom of cryptosporidiosis. There was a high prevalence of </span><i><span style="font-family:Verdana;">Cryptosporidium</span></i><span style="font-family:Verdana;"> infection among young children, especially in the most recent year. Routine testing of </span><i><span style="font-family:Verdana;">Cryptosporidium</span></i><span style="font-family:Verdana;"> infection using molecular methods, constant monitoring and identification of the infection sources is therefore necessary towards reducing the disease burden in the low resource settings.</span></span> 展开更多
关键词 Cryptosporidium Infection Informal Urban Settlement Children below 24 Months TREND TaqMan™ Array Card
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A Note on the Way-Below Relation on LSC(X, R~*)~*
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作者 王戈平 《Journal of Mathematical Research and Exposition》 CSCD 1999年第4期646-648,共3页
A mistake in Proposition I-1.21.1 of 'A Compendium of Continuous Lattices'by G.Giers et al. is pointed out and a revised proposition with a proof is given.
关键词 lower semicontinuous function way-below relation.
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Boundedness from below of composition operators on the Bloch spaces 被引量:7
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作者 陈怀惠 《Science China Mathematics》 SCIE 2003年第6期838-846,共9页
This paper proves that a necessary condition for a composition operator on the Bloch space of the unit disk to be bounded below given by Ghatage, Yan and Zheng is also sufficient. Given furthermore are a sufficient co... This paper proves that a necessary condition for a composition operator on the Bloch space of the unit disk to be bounded below given by Ghatage, Yan and Zheng is also sufficient. Given furthermore are a sufficient condition and a necessary condition of the boundedness from below for a composition operator on the Bloch space of a unit ball with dimensions bigger than one. 展开更多
关键词 BLOCH space COMPOSITION operator BOUNDEDNESS from below.
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Below-Cloud Aerosol Scavenging by Different-Intensity Rains in Beijing City 被引量:4
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作者 Tian LUAN Xueliang GUO +1 位作者 Tianhang ZHANG Lijun GUO 《Journal of Meteorological Research》 SCIE CSCD 2019年第1期126-137,共12页
Below-cloud aerosol scavenging process by precipitation is important for cleaning the polluted aerosols in the atmosphere, and is also a main process for acid rain formation. However, the related physical mechanism ha... Below-cloud aerosol scavenging process by precipitation is important for cleaning the polluted aerosols in the atmosphere, and is also a main process for acid rain formation. However, the related physical mechanism has not been well documented and clarified yet. In this paper, we investigated the below-cloud PM_(2.5)(particulate matter with aerodynamic diameter being 2.5 μm or less) scavenging by different-intensity rains under polluted conditions characterized by high PM_(2.5) concentrations, based on in-situ measurements from March 2014 to July 2016 in Beijing city. It was found that relatively more intense rainfall events were more efficient in removing the polluted aerosols in the atmosphere. The mean PM_(2.5) scavenging ratio and its standard deviation(SD) were 5.1% ± 25.7%, 38.5% ± 29.0%,and 50.6% ± 21.2% for light, moderate, and heavy rain events, respectively. We further found that the key impact factors on below-cloud PM_(2.5) scavenging ratio for light rain events were rain duration and wind speed rather than raindrop size distribution. However, the impacts of rain duration and wind speed on scavenging ratio were not important for moderate and heavy rain events. To our knowledge, this is the first statistical result about the effects of rain intensity, rain duration, and raindrop size distribution on below-cloud scavenging in China. 展开更多
关键词 PM2.5 below-cloud SCAVENGING RAIN INTENSITY impact FACTORS
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国医大师熊继柏基于“窠囊”论治抑郁症
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作者 吴朝玲 蒙珊慧 +4 位作者 郭梦坤 唐瑶 黄保玲 颜旭 熊继柏(指导) 《中国中医药信息杂志》 2025年第2期179-183,共5页
本文介绍国医大师熊继柏教授基于“窠囊”论治抑郁症的临证经验。熊继柏教授认为,抑郁症基本病机是“窠囊”,根本病理因素为痰、瘀,治疗以化痰行气、祛瘀散结为基本治法,临证注重理论联系实践,强调辨证施治与整体观念统一,遵循“因、机... 本文介绍国医大师熊继柏教授基于“窠囊”论治抑郁症的临证经验。熊继柏教授认为,抑郁症基本病机是“窠囊”,根本病理因素为痰、瘀,治疗以化痰行气、祛瘀散结为基本治法,临证注重理论联系实践,强调辨证施治与整体观念统一,遵循“因、机、理、法、方、药”六步骤。在抑郁症治疗中“上病下取”与“推陈致新”,“防治转移”与“身心同治”相结合,疗效显著。 展开更多
关键词 抑郁症 窠囊 上病下取 推陈致新 名医经验
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Sulfur isotope geochemistry of the Lemachang independent Ag deposit, northeastern Yunnan——A concurrent discussion on the mechanism of sulfur isotope equilibrium between barite and freibergite below 300℃
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作者 DENG Hailin~1, LI Chaoyang~1, ZHOU Yunman~2 and WANG Congwu~2 1. Open Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 2. No.3 Braneh of No.1 Geology Party, Yunnan Bureau of Geology and Mineral Resources, Xundian 655205, China 《Chinese Science Bulletin》 SCIE EI CAS 1999年第S2期227-230,共4页
IN the study of hydrothermal deposits sulfur isotopes bear much information about the source of sulfur,ore-forming temperature, the evolution of ore-forming fluids and the mechanism of metallogenesis. Todetermine whet... IN the study of hydrothermal deposits sulfur isotopes bear much information about the source of sulfur,ore-forming temperature, the evolution of ore-forming fluids and the mechanism of metallogenesis. Todetermine whether sulfur isotopes reach equilibrium between fluids and sulfur-bearing minerals precipitated from the former and among the sulfur-bearing minerals is the key to the application of sulfur isotopegeochemistry to geological problems. As it has been commonly accepted that sulfur isotopic equilibrium could not be reached between sulfate and sulfide below 350℃, little attention has been paid to thepossible mechanism of sulfur isotope equilibrium between sulfate and sulfide below 300℃. However, this note presents an example to show sulfur isotope equilibrium between barite and sulfate 展开更多
关键词 SULFUR ISOTOPE Lemachang INDEPENDENT Ag DEPOSIT BARITE freibergite SULFUR ISOTOPE EQUILIBRIUM below 300℃.
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