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pH值和外加汞浓度对汞在棕土中的吸附-解吸动力学特征的影响 被引量:8
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作者 李英华 孙丽娜 《农业环境科学学报》 CAS CSCD 北大核心 2008年第2期579-582,共4页
用平衡液吸附和Ca(NO3)2溶液的解吸法,对棕土在pH3-6.5,汞浓度0.2-8mg·kg-1的吸附-解吸动力学进行了研究,以阐明pH和初始浓度对汞有效性的影响。结果表明,pH6.5,浓度8mg·kg-1条件下,60min即可达到汞最大吸附量的93%;10000min... 用平衡液吸附和Ca(NO3)2溶液的解吸法,对棕土在pH3-6.5,汞浓度0.2-8mg·kg-1的吸附-解吸动力学进行了研究,以阐明pH和初始浓度对汞有效性的影响。结果表明,pH6.5,浓度8mg·kg-1条件下,60min即可达到汞最大吸附量的93%;10000min达最大解吸量的78.8%。解吸汞占吸附汞的比例随pH升高而升高,在浓度2mg·kg-1,pH3-6.5下,棕土解吸汞占吸附汞的比例为11%-37.4%。Freundlich方程为描述汞吸附-解吸动力学特征的最优模型,其次为Elovich方程。模拟的最大吸附量达84.3mg·kg-1,在此以下,汞的吸附容量随外加汞浓度、时间的递增而升高。解吸速率随初始浓度增加而增加,随解吸时间的延长不断降低。这些结果表明,pH和外加汞浓度影响汞在棕土中的吸附-解吸动力学特征,从而影响在土壤介质中的迁移。 展开更多
关键词 吸附-解吸 棕土 动力学
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NUMBER THEORETIC METHODS IN APPLIED STATISTICS (Ⅱ) 被引量:4
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作者 王元 方开泰 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 1990年第3期384-395,共12页
In this paper, the authors give some applications of F-uniformly distributedsequences, which are suggested in their previous paper under the same title, in experimen-tal design, experiments with mixtures, geometric pr... In this paper, the authors give some applications of F-uniformly distributedsequences, which are suggested in their previous paper under the same title, in experimen-tal design, experiments with mixtures, geometric probability and simulation. 展开更多
关键词 UNIFORMLY MIXTURES UNIFORM GENERA umber PROBABILITY deviation OVERLAP 砂城 minimizing
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DISPERSED PHASE HOLDUP AND DROP SIZE DISTRIBUTION IN A ROTATING PERFORATED DISK CONTACTOR 被引量:1
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作者 冯毓如 裘元焘 时钧 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 1991年第1期28-37,共10页
Hydrodynamic characteristics of rotating perforated disk contactor(RPDC)were studied with emulsionwater system.The emulsion was dispcrsed in water and its holdup was measured.The effects of columndimensions and operat... Hydrodynamic characteristics of rotating perforated disk contactor(RPDC)were studied with emulsionwater system.The emulsion was dispcrsed in water and its holdup was measured.The effects of columndimensions and operating conditions on holdup and characteristic velocity were studied.By using the methodof dimensional analysis,the authors obtained two experimental correlations for estimating holdup and characteristic velocity respectively.Drop size distribution was studied photographically.The experimental results showedthat drop size distribuiion could be described by upper-limit log-normal distribution. 展开更多
关键词 ROTATING estimating EMULSION umber rotor dispersed PHOTOGRAPH eliminate DISTR dimensions
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A NEW MOSAICKING METHOD FOR LANDSAT REMOTE SENSING IMAGES
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作者 王天禧 《Chinese Science Bulletin》 SCIE EI CAS 1987年第12期854-859,共6页
In the previous papers, discussions of digital mosaicking problem for Landsat remote sensing were concentrated on various methods of geometric registration, while the sun angle effect correction method was mainly used... In the previous papers, discussions of digital mosaicking problem for Landsat remote sensing were concentrated on various methods of geometric registration, while the sun angle effect correction method was mainly used for smearing brightness difference 展开更多
关键词 LANDSAT REGISTRATION correction BRIGHTNESS satisfactory determining AUTOMATICALLY discussions umber OVERLAP
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THEORY OF ADSORPTION ON CO-PRECIPITATION OF NONPOTENTIAL-DETERMINING IONS
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作者 艾宏韬 《Chinese Science Bulletin》 SCIE EI CAS 1982年第1期33-38,共6页
This paper suggests on the basis of researches on classification of ionic adsorption a model for adsorption on co-precipitation of nonpolential-determining ions.1. Every potential-determining ion on the surface of a s... This paper suggests on the basis of researches on classification of ionic adsorption a model for adsorption on co-precipitation of nonpolential-determining ions.1. Every potential-determining ion on the surface of a solid is an adsorption centre of nonpotential-determining ions in solution. This centre only adsorbs 展开更多
关键词 DETERMINING centre adsorbed IONIC ISOTHERM umber MILLING saturated SALTS familiar
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CYTOPLASMIC EFFECT OF Xenopus laevis ON NUCLEAR FUNCTION OF ITS ALBINO MUTANT
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作者 于豪建 史长平 《Chinese Science Bulletin》 SCIE EI CAS 1986年第10期718-719,共2页
The nucleo-cytoplasmic interactions have been studied by many investigators and it is well established that nucleus and cytoplasm are interdependent and interacting. We have studied the effects of the cytoplasm of wil... The nucleo-cytoplasmic interactions have been studied by many investigators and it is well established that nucleus and cytoplasm are interdependent and interacting. We have studied the effects of the cytoplasm of wild-type Xenopus 展开更多
关键词 LAEVIS CYTOPLASMIC interacting nucleus MUTANT DORSAL nucleo umber DOSAGE abundant
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THE MASSIVE NEUTRINO AND THE CLUSTERING PHENOMENA IN THE UNIVERSE
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作者 陆埮 朱沛臣 《Chinese Science Bulletin》 SCIE EI CAS 1983年第1期63-68,共6页
Neutrinos are rather abundant in the universe, nearly as abundant as photons. The non-vanishing of neutrino’s rest mass should certainly induce many interesting astrophysical effects. in this paper, we shall discuss ... Neutrinos are rather abundant in the universe, nearly as abundant as photons. The non-vanishing of neutrino’s rest mass should certainly induce many interesting astrophysical effects. in this paper, we shall discuss mainly the influence of massive neutrinos on the clustering phenomena in the universe. 展开更多
关键词 abundant UNIVERSE GALAXIES VANISHING CLUSTERING dominated ordinary latter umber STEEP
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HOW FAST THE ALGEBRAIC APPROX-IMATION CAN BE?
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作者 洪加威 《Chinese Science Bulletin》 SCIE EI CAS 1986年第3期215-216,共2页
Suppose that we want to compute any number by means of operations like +, -, *, /, and suppose that in one step we can get the exact value of the operation performed. Then the number t(n) of the steps needed to obtain... Suppose that we want to compute any number by means of operations like +, -, *, /, and suppose that in one step we can get the exact value of the operation performed. Then the number t(n) of the steps needed to obtain n approximate digits of the final result is either O(1) or Ω(log n). There is a gap. 展开更多
关键词 compute STEPS SUPPOSE approximate operations exact FAST umber INTEGER letter
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A METHOD OF IDENTIFYING THE ABSORPTION LINE SYSTEMS IN HIGH REDSHIFT QSOs' SPECTRA
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作者 崔振兴 陈建生 +2 位作者 唐小英 卞毓麟 邹振隆 《Chinese Science Bulletin》 SCIE EI CAS 1983年第12期1632-1638,共7页
Ⅰ. INTRODUCTION From the studies of the absorption lines in the spectra of the high redshift QSOs, the fact has been established that a very high percentage of the lines shortward of the Lα emission cannot be identi... Ⅰ. INTRODUCTION From the studies of the absorption lines in the spectra of the high redshift QSOs, the fact has been established that a very high percentage of the lines shortward of the Lα emission cannot be identified by the current computer searching method, and 展开更多
关键词 SEARCHING umber satis UNIFORMLY ANSWER FILT false 石弓 labeled 成口
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FREE DEFORMATION RETRACTION IN INJECTIVE METRIC SPACES
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作者 麦结华 唐云 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 1989年第2期221-226,共6页
In this paper the authors establish the concept of generalized ball-intersection (GBI) and prove that an injective metric space is freely contractible to its each GBI, which generalizes a result of Isbell from a point... In this paper the authors establish the concept of generalized ball-intersection (GBI) and prove that an injective metric space is freely contractible to its each GBI, which generalizes a result of Isbell from a point to a GBI. 展开更多
关键词 INTERSECTION freely umber UNIFORMLY 二七 ORDERED 云一 任履 戈云 子全
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OBSERVATIONS ON THE VARIATION OF THE METACERCARIA OF PARAGONIMUS WESTERMANI
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作者 刘思成 张德才 +1 位作者 李友松 许志辉 《Chinese Science Bulletin》 SCIE EI CAS 1982年第5期560-562,共3页
H. T. Chen made a dog infected with 6 platy-form metacercariae obtained from the fresh water crab-Potamon denticulatum, thus acquiring one adult worm named. P. asymmetricus as a new species.
关键词 platy acquiring FRESH INFECTED TRIANGULAR umber BLADDER longitudinal 林乙 SLIDE
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让我也来试试GRE数学题
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作者 关涛 《英语沙龙(初级版)》 2005年第5期13-13,35,共2页
1. On a highway(公路)there is an electric pole(电线杆)every 96 feet. If the poles arenumbered consecutively(连续地),what is the number of the pole 2 miles past polenumber 56?(1 mile=5,280 feet)2. A certain money marke... 1. On a highway(公路)there is an electric pole(电线杆)every 96 feet. If the poles arenumbered consecutively(连续地),what is the number of the pole 2 miles past polenumber 56?(1 mile=5,280 feet)2. A certain money market account(银行账户)that had a balance(余款)of $48,000 展开更多
关键词 数学题 GRE 银行账户 MONEY HIGHWAY earned 单利率 umber 中所
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THE COMPLETENESS AND APPROXIMATION OF HU HAICHANG'S SOLUTION
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作者 张鸿庆 王震宇 《Chinese Science Bulletin》 SCIE EI CAS 1986年第10期667-670,共4页
It is well known that the elastic displacement U=(u^1, u^2, u^3) of an isotropie body A without volume forces satisfies homogeneous Lame’s differential
关键词 straight PARTITION umber SUBSET dense SOLVABILITY NEIGHBOR body approximating verify
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General Diagnosis
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《China Medical Abstracts(Internal Medicine)》 2005年第4期193-194,共2页
2005436 Use of <sup>99m</sup>Tc-survivin antisense oligonucle-otide in diagnosis of hepatocellular carcinoma:an ex-periment with mice.GAO Zairong(高再荣),et al.Dept Nucl Med,Union Hosp,Tonji Med Coll,Hua... 2005436 Use of <sup>99m</sup>Tc-survivin antisense oligonucle-otide in diagnosis of hepatocellular carcinoma:an ex-periment with mice.GAO Zairong(高再荣),et al.Dept Nucl Med,Union Hosp,Tonji Med Coll,Hua-zhong Sci & Technol Univ,Wuhan 430022.Natl Med JChina 2005;85(33):2327-30. 展开更多
关键词 WUHAN ANTISENSE ASON Radiol NODULES labeled 张礼 NUDE POSSIBILITY umber
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THE RULE OF HOMOLOGOUS LINEARITY OF THE INTERSTELLAR POLYYNECYANIDES AND THE ESTIMATION OF THE EVOLUTION AGE OF TMC-1
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作者 赵南生 何维凌 《Chinese Science Bulletin》 SCIE EI CAS 1985年第6期759-763,共5页
Ⅰ. INTRODUCTION In 1971, HCN was discovered in the interstellar space by means of radio telescope, and afterwards HC3N was detected in the same year. In 1976, HC5N was determined in TMC-1. All of these discoveries at... Ⅰ. INTRODUCTION In 1971, HCN was discovered in the interstellar space by means of radio telescope, and afterwards HC3N was detected in the same year. In 1976, HC5N was determined in TMC-1. All of these discoveries attracted much general attention. They were con- 展开更多
关键词 rotation telescope umber latter deter drawn INFERIOR ORBITAL SERIAL esses
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ENUMERATION OF CERTAIN SETS OF PERMUTATIONS
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作者 栾汝书 《Chinese Science Bulletin》 SCIE EI CAS 1984年第12期1583-1589,共7页
Ⅰ. INTRODUCTION Let Zn = {1, 2, …, n}, and Pn be the set of n. permutations π = a1a2…an of Zn.We define the following conditions (ⅰ)—(ⅲ):
关键词 umber SUBSET PERMUTATION 了公 satisfying SUBSTITUTE GENERA 内凡 pointed 全一
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Archaeological Find at the Longxing TempleCauses a Sensation
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《China & The World Cultural Exchange》 1997年第4期39-40,共2页
关键词 umber served
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TRANSCENDENTAL CONTINUED FRACTIONS
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作者 莫德泽 《Chinese Science Bulletin》 SCIE EI CAS 1987年第20期1373-1377,共5页
Ⅰ. INTRODUCTION AND RESULTS If (an) and (bn), n=1, 2,…, are two sequences of positive rational integers, then, under Perron’s notation, the real irrational numbers A, B are defined by the simple continued fract... Ⅰ. INTRODUCTION AND RESULTS If (an) and (bn), n=1, 2,…, are two sequences of positive rational integers, then, under Perron’s notation, the real irrational numbers A, B are defined by the simple continued fractions [a1, a2, a3,…] and [b1, b2, b3,…], respectively. In this note we wish to establish the following results under a slighter condition than that mentioned in Refs. [2] and [3]. 展开更多
关键词 notation RATIONAL INTEGERS continued mentioned sufficiently umber ALGEBRAIC satisfy estab
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对基于广义斐波那契数列型背包体制的密码分析
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作者 李大兴 《信息安全与通信保密》 1991年第1期35-40,共6页
本文通过对广义斐波那契数列性质的研究,指出基于广义斐波那契数列的背包体制要么不能正确加解密,要么是Merkle—Hellman超递增体制的特款,因而是不安全的。最后,对背包体制的脆弱性实质进行一些讨论。
关键词 斐波那契数 密码分析 umber 数字签名 背包公钥密码 加密密钥 背包问题 贪心算法 局域网络 计算保密
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STUDY ON RHEOLOGICAL BEHAVIOR OF THE MELTED POLYMER——RELATIONSHIP BETWEEN η_α AND _n
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作者 常棉 张希庆 +2 位作者 曹永华 王梓杰 王少君 《Chinese Science Bulletin》 SCIE EI CAS 1988年第10期837-842,共6页
An experimental study on rheological behavior of the melted polymer, with the aid of the theory of the three-parameter model suggested by the author, is conducted. A practical equation below is derived through analysi... An experimental study on rheological behavior of the melted polymer, with the aid of the theory of the three-parameter model suggested by the author, is conducted. A practical equation below is derived through analysing the melted law of η. and (?)_n, 展开更多
关键词 RHEOLOGICAL VISCOSITY OVERCOME AND umber AUDIO removed CALCULATING introd haver
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