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Stoichiometry and Stability Constant Values for Copper (II) Chelates with Ethylene Diamine in Deep Eutectic Solvents (DES) (Ethaline) Solutions
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作者 Khalid El Ttaib Abdolhadi Benhmid Rifat Hasan Omar 《Open Journal of Applied Sciences》 2024年第9期2592-2609,共18页
In this study we used the deep eutectic solvents (ionic liquids) to investigate the reaction between copper (II) with ethylene diamine (en). Two of the existing methods for analyzing spectrophotometric measurements ha... In this study we used the deep eutectic solvents (ionic liquids) to investigate the reaction between copper (II) with ethylene diamine (en). Two of the existing methods for analyzing spectrophotometric measurements have been applied for establishing, the stoichiometry and whenever possible, the stability constants of the chelates formed. The method of continuous variations was necessary to determine first whether, the metal ion and the ligand ethylene diamine form one or more than one chelate, when more than one chelate formed, the results obtained depend on the wavelength and for meaningful conclusions the wavelengths were carefully selected. The empirical formulae of the chelates were further substantiated by the molar ratio method. The effect of time and temperature on the formation and stability of these chelates in solution is also studied. The stability constants, K1 and K2 for the copper (II) chelates were calculated, though reliable, and are comparable to literature values. 展开更多
关键词 CU(II) Ethylene Diamine (en) Deep Eutectic solvents Job’s Method Ionic Liquids and stability Constant
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Unmanned Ship Identification Based on Improved YOLOv8s Algorithm
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作者 Chun-Ming Wu Jin Lei +2 位作者 Wu-Kai Liu Mei-Ling Ren Ling-Li Ran 《Computers, Materials & Continua》 SCIE EI 2024年第3期3071-3088,共18页
Aiming at defects such as low contrast in infrared ship images,uneven distribution of ship size,and lack of texture details,which will lead to unmanned ship leakage misdetection and slow detection,this paper proposes ... Aiming at defects such as low contrast in infrared ship images,uneven distribution of ship size,and lack of texture details,which will lead to unmanned ship leakage misdetection and slow detection,this paper proposes an infrared ship detection model based on the improved YOLOv8 algorithm(R_YOLO).The algorithm incorporates the Efficient Multi-Scale Attention mechanism(EMA),the efficient Reparameterized Generalized-feature extraction module(CSPStage),the small target detection header,the Repulsion Loss function,and the context aggregation block(CABlock),which are designed to improve the model’s ability to detect targets at multiple scales and the speed of model inference.The algorithm is validated in detail on two vessel datasets.The comprehensive experimental results demonstrate that,in the infrared dataset,the YOLOv8s algorithm exhibits improvements in various performance metrics.Specifically,compared to the baseline algorithm,there is a 3.1%increase in mean average precision at a threshold of 0.5(mAP(0.5)),a 5.4%increase in recall rate,and a 2.2%increase in mAP(0.5:0.95).Simultaneously,while less than 5 times parameters,the mAP(0.5)and frames per second(FPS)exhibit an increase of 1.7%and more than 3 times,respectively,compared to the CAA_YOLO algorithm.Finally,the evaluation indexes on the visible light data set have shown an average improvement of 4.5%. 展开更多
关键词 Unmanned ships R_YOLO EMA CsPstage YOLOv8s
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Stability Analysis of Bohai Oil-Drilling Ship No. 6 Under Static and Cyclic Loads 被引量:3
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作者 Qiu Changlin Yan Shuwang Graduate student, Dept. of Hydraulic Engrg., Tianjin University . Professor, Dept. of Hydraulic Engrg., Tianjin University 《China Ocean Engineering》 SCIE EI 1996年第4期465-472,共8页
This paper presents a procedure to calculate the safety factor against sliding of a marine gravity structure subjected to a combination of static and cyclic loads. This procedure claculates the stress at the sliding s... This paper presents a procedure to calculate the safety factor against sliding of a marine gravity structure subjected to a combination of static and cyclic loads. This procedure claculates the stress at the sliding surface by the finite element method (FEM) and takes the dynamic properties of clay into account. With this procedure, the stability of a Bohai oil-drilling ship is analyzed. The calculated safety factor is much smaller than 1, indicating that this oil-drilling ship would fail just as what had happened to it. 展开更多
关键词 oil-drilling ship stability analysis safety factor static and cyclic loads
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Roll stability catastrophe mechanism of a flooded ship on regular sea waves 被引量:1
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作者 刘玉良 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第4期396-399,共4页
Based on a typical one-free-degree ship roll motion equation, the cusp catastrophe model is built including the bifurca- tion set equation, splitting factor 'u' and regular factor 'v', where both 'u' and 'v' a... Based on a typical one-free-degree ship roll motion equation, the cusp catastrophe model is built including the bifurca- tion set equation, splitting factor 'u' and regular factor 'v', where both 'u' and 'v' are further expressed with typical flooded ship parameters. Then, the roll catastrophe mechanism is analyzed mainly by means of 'u', under the given parameters of a typical trawler boat. The aim of this research is to reveal the mutagenic mechanism of the roll stability and provide a reference for improving ship roll stability. 展开更多
关键词 flooded ship roll stability catastrophe mechanism splitting factor
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Numerical Simulation of PMM Tests for A Ship in Close Proximity to Sidewall and Maneuvering Stability Analysis 被引量:1
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作者 刘晗 马宁 顾解忡 《China Ocean Engineering》 SCIE EI CSCD 2016年第6期884-897,共14页
As the maneuverability of a ship navigating close to a bank is influenced by the sidewall, the assessment of ship maneuvering stability is important. The hydrodynamic derivatives measured by the planar motion mechani... As the maneuverability of a ship navigating close to a bank is influenced by the sidewall, the assessment of ship maneuvering stability is important. The hydrodynamic derivatives measured by the planar motion mechanism (PMM) test provide a way to predict the change of ship maneuverability. This paper presents a numerical simulation of PMM model tests with variant distances to a vertical bank by using unsteady RANS equations. A hybrid dynamic mesh technique is developed to realize the mesh configuration and remeshing of dynamic PMM tests when the ship is close to the bank. The proposed method is validated by comparing numerical results with results of PMM tests in a circulating water channel. The first-order hydrodynamic derivatives of the ship are analyzed from the time history of lateral force and yaw moment according to the multiple-run simulating procedure and the variations of hydrodynamic derivatives with the ship-sidewall distance are given. The straight line stability and directional stability are also discussed and stable or unstable zone of proportional-derivative (PD) controller parameters for directional stability is shown, which can be a reference for course keeping operation when sailing near a bank. 展开更多
关键词 sidewall effect numerical simulation planar motion mechanism (PMM) hybrid dynamic mesh technique ship maneuvering stability
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A Multidisciplinary Method for Evaluating Ship Stability 被引量:3
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作者 Francesca Calabrese Luisa Mancarella +1 位作者 Alessandro Antonio Zizzari Angelo Corallo 《Journal of Shipping and Ocean Engineering》 2012年第6期321-326,共6页
The aim of this paper is to present the main results arisen from the joint efforts of the public-private partnership in being between CCII (Centro Cultura Innovativa d'Impresa) of University of Salento and Apphia s... The aim of this paper is to present the main results arisen from the joint efforts of the public-private partnership in being between CCII (Centro Cultura Innovativa d'Impresa) of University of Salento and Apphia s.r.l.. This paper will focus on the results of the core of the OBSS (on board stability system) module that, starting from the exact 3D geometry of a ship hull, described by a discrete model in a standard format, the distribution of all weights onboard and the data acquired by the system, calculates ship floating conditions (in draught, heel and trim). The proposed approach is based on geometry meshes represented by an universally accepted file format (named OBJ) first developed by Wavefront Technologies. Demonstration of the validity of the results is done by the authors using as hull model a simple rectangular box. 展开更多
关键词 ALGORITHMs computer applications EQUILIBRIUM ship floating conditions marine applications stability systems.
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Capsizing Probability of Dead Ship Stability in Beam Wind and Wave for Damaged Ship
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作者 HU Li-fen ZHANG Ke-zheng +1 位作者 LI Xiao-ying CHANG Run-xin 《China Ocean Engineering》 SCIE EI CSCD 2019年第2期245-251,共7页
The International Maritime Organization has developed the second-generation intact stability criteria. Thus, damage stability criteria can be established in the future. In order to identity the capsizing probability o... The International Maritime Organization has developed the second-generation intact stability criteria. Thus, damage stability criteria can be established in the future. In order to identity the capsizing probability of damaged ship under dead ship condition, this paper investigates two methods that can be used to research the capsizing probability in time domain, which mainly focus on the nonlinear righting lever GZ curve solution. One method subjects the influence of damaged tanks on the hull shape down to the wind and wave, and the other method is consistent with the real-time calculation of the GZ curve. On the basis of one degree of freedom rolling equation, the solution is Monte Carlo method, and a damaged fishery bureau vessel is taken as a sample ship. In addition, the results of the time-domain capsizing probability under different loading conditions are compared and analyzed. The relation of GM and heeling angle with the capsizing probability is investigated, and its possible reason is analyzed. On the basis of combining the time-domain flooding process with the capsizing probability calculation, this research aims to lay the foundation for the study of capsizing probability in time domain under dead ship condition, as well as provide technical support for capsizing mechanism of dead ship stability and damage stability criteria establishment in waves. 展开更多
关键词 damage stability CRITERIA DEAD ship stability capsizing PROBABILITY FLOODING process time domain
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The Application of a Smartphone in Ship Stability Experiment
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作者 Mohamed Abdelkader Djebli Benameur Hamoudi Omar Imine Lahouari Adjlout 《Journal of Marine Science and Application》 CSCD 2015年第4期406-412,共7页
The inclining experiment is the only regulatory tool to assess ship stability. This experiment is a time consuming process for both real-life tests and ship model experiments. The difficulty is mainly due to a bias in... The inclining experiment is the only regulatory tool to assess ship stability. This experiment is a time consuming process for both real-life tests and ship model experiments. The difficulty is mainly due to a bias in the measurement of heel angle. Nowadays, digital inclinometers are available, but they are expensive. In this study, the use of a smartphone application is presented for ship inclination and rolling-period tests. The idea consists of using accelerometer and gyroscope sensors built into the current smartphones for the measurements. Therefore, some experiments are carried out on an example trawler model to exhibit the uses and advantages of this method. The obtained results are in good agreement with those provided from the pendulum method and natural roll-period test. This application is new, easy, and more accurately assesses metacentric height during the inclining and rolling-period tests. 展开更多
关键词 ship stability GM-Meter inclining experiment rolling-period test sMARTPHONE ACCELEROMETER gyroscopic sensor
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Design and Stability Analysis of Fuzzy Switched PID Controller for Ship Track-Keeping
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作者 Baozhu Jia Hui Cao Jie Ma 《Journal of Transportation Technologies》 2012年第4期334-338,共5页
The fuzzy switched PID controller which combines fuzzy PD and conventional PI controller is proposed for ship track-keeping autopilot In this paper. By using rudder angle, the whole voyage is divided into two operatin... The fuzzy switched PID controller which combines fuzzy PD and conventional PI controller is proposed for ship track-keeping autopilot In this paper. By using rudder angle, the whole voyage is divided into two operating regimes which named transient operating regime and steady operating regime respectively. The fuzzy PD controller is employed in transient operating regime for increasing response, reducing overshoot and shorting transition time. And conventional PI controller is used to improve the stable accuracy in steady operating regime. The global controller is achieved by fuzzy blending of all local controllers. Routh stability criterion is utilized to obtain the stability condition of closed-loop system. The simulation results show the effectiveness of proposed method. 展开更多
关键词 ship Control FUZZY sWITCHED PID TRACK-KEEPING FUZZY Operating REGIME stability Condition
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Striving to Gain a Long-term Stability for the China——U.S.Relationship
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作者 Tao Wenzhao 《和平与发展》 CSSCI 北大核心 2006年第3期57-64,共8页
关键词 U.s.Relationship striving to Gain a Long-term stability for the China THAN LONG
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10℃条件下纳米C-S-H掺量对水泥早期水化的影响 被引量:1
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作者 房延凤 惠一心 +2 位作者 尚小朋 丁向群 佟钰 《沈阳建筑大学学报(自然科学版)》 CAS 北大核心 2024年第3期505-512,共8页
目的探究10℃条件下不同掺量纳米C-S-H对水泥早期水化进程及强度发展的影响,并分析其早强剂作用机理。方法通过溶液共沉淀法制备纳米C-S-H悬浮液,将其掺入到普通硅酸盐水泥中,在10℃条件下进行养护,分析其对水泥凝结时间、抗折强度、抗... 目的探究10℃条件下不同掺量纳米C-S-H对水泥早期水化进程及强度发展的影响,并分析其早强剂作用机理。方法通过溶液共沉淀法制备纳米C-S-H悬浮液,将其掺入到普通硅酸盐水泥中,在10℃条件下进行养护,分析其对水泥凝结时间、抗折强度、抗压强度的影响;通过XRD、TG等检测手段分析水泥的水化进程及对水化产物的影响。结果掺入0.05%纳米C-S-H,可使水泥初凝时间缩短9.9%,终凝时间缩短10.4%;24 h时抗折强度和抗压强度分别提高了34%和33.5%。纳米C-S-H的掺入造成水泥3 d抗折强度略有降低。水化产物中Ca(OH)2质量分数在12 h、16 h和24 h时较参比样分别提高了17.6%、21.3%和29.6%。结论在10℃条件下,纳米C-S-H的加入能够有效促进C 3S和C 2S的水化过程,形成更多的水化产物,从而缩短水泥凝结时间,提高24 h内水泥砂浆强度,28 d强度没有显著降低。 展开更多
关键词 纳米C-s-H 稳定性 10℃ 早期水化 抗压强度
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Investigation of factors influencing roof stability at a Western U.S.longwall coal mine 被引量:3
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作者 Meriel Young Gabriel Walton Elizabeth Holley 《International Journal of Mining Science and Technology》 EI CSCD 2019年第1期139-143,共5页
The coal mine roof rating(CMRR) was developed to bridge the gap between geological variation in underground coal mines and engineering design. The CMRR accounts for the compressive strength of the immediate roof, the ... The coal mine roof rating(CMRR) was developed to bridge the gap between geological variation in underground coal mines and engineering design. The CMRR accounts for the compressive strength of the immediate roof, the shear strength and intensity of any discontinuities present, and the moisture sensitivity of the immediate roof. The CMRR has been widely used and validated in Eastern US coal mines, but it has seen limited application in the Western US. This study focuses on roof behavior at a Western coal mine(Mine A). Mine A shows significant lateral geological variation, along with localized faulting and a laterally extensive sandstone channel network. The CMRR is not used to predict roof instability at the mine. It is, therefore, hypothesized that there are other factors that are correlated with roof instability in underground coal mines that could potentially also be considered in conjunction with the CMRR.This hypothesis was tested by collecting 30 CMRR measurements at Mine A. At each measurement location, a binary record of the roof condition(stable or unstable) was made, and other parameters such as depth of cover, presence of faulting, and sandstone channels were also recorded. ANOVA tests showed that the CMRR values and the roof conditions were not strongly correlated, indicating that the CMRR input criteria are not fully predictive of roof stability at this mine. The CMRR values showed statistically significant correlations(p less than 0.05) with faulting as well as with location at an intersection. For areas that had previously experienced roof fall but were currently stable, faulting was correlated with roof condition(p less than 0.05) only when the condition was classified as unstable. 展开更多
关键词 COAL MINE ROOF stability CMRR WEsTERN U.s.coal Case study
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Stability Analysis on Speed Control System of Autonomous Underwater Vehicle 被引量:2
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作者 李晔 庞永杰 +2 位作者 万磊 王芳 廖煜雷 《China Ocean Engineering》 SCIE EI 2009年第2期345-354,共10页
The stability of the motion control system is one of the decisive factors of the control quality for Autonomous Underwater Vehicle(AUV).The divergence of control,which the unstable system may be brought about,is fat... The stability of the motion control system is one of the decisive factors of the control quality for Autonomous Underwater Vehicle(AUV).The divergence of control,which the unstable system may be brought about,is fatal to the operation of AUV.The stability analysis of the PD and S-surface speed controllers based on the Lyapunov's direct method is proposed in this paper.After decoupling the six degree-of-freedom(DOF)motions of the AUV,the axial dynamic behavior is discussed and the condition is deduced,in which the parameters selection within stability domain can guarantee the system asymptotically stable.The experimental results in a tank and on the sea have successfully verified the algorithm reliability,which can be served as a good reference for analyzing other AUV nonlinear control systems. 展开更多
关键词 autonomous underwater vehicle AUV) control system stability analysis Lyapunov's stability theory
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Linear instability of the electrified free interface between two cylindrical shells of viscoelastic fluids through porous media 被引量:2
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作者 Magdy A. Sirwah 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2012年第6期1572-1589,共18页
In this paper, we have discussed the linear stabil- ity analysis of the electrified surface separating two coaxial Oldroyd-B fluid layers confined between two impermeable rigid cylinders in the presence of both interf... In this paper, we have discussed the linear stabil- ity analysis of the electrified surface separating two coaxial Oldroyd-B fluid layers confined between two impermeable rigid cylinders in the presence of both interfacial insoluble surfactant and surface charge through porous media. The case of long waves interfacial stability has been studied. The dispersion relation is solved numerically and hence the ef- fects of various parameters are illustrated graphically. Our results reveal that the influence of the physicochemical pa- rameterβ is to shrink the instability region of the surface and reduce the growth rate of the unstable normal modes. Such important effects of the surfactant on the shape of in- terfacial structures are more sensitive to the variation of the βcorresponding to non-Newtonian fluids-model compared with the Newtonian fluids model. In the case of long wave limit, it is demonstrated that increasing r, has a dual role in- fluence (de-stabilizing effects) depending on the viscosity of the core fluid. It has a destabilizing effect at the large values of the core fluid viscosity coefficient, while this role is ex- changed to a regularly stabilizing influence at small values of such coefficient. 展开更多
关键词 Modified Darcy's law Oldroyd-B model Cap-illary stability flow Insoluble surfactant surface charges Porous media
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Stability analysis of helical rod based on exact Cosserat model 被引量:1
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作者 刘延柱 薛纭 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2011年第5期603-612,共10页
Helical equilibrium of a thin elastic rod has practical backgrounds, such as DNA, fiber, sub-ocean cable, and oil-well drill string. Kirchhoff's kinetic analogy is an effective approach to the stability analysis of e... Helical equilibrium of a thin elastic rod has practical backgrounds, such as DNA, fiber, sub-ocean cable, and oil-well drill string. Kirchhoff's kinetic analogy is an effective approach to the stability analysis of equilibrium of a thin elastic rod. The main hypotheses of Kirchhoff's theory without the extension of the centerline and the shear deformation of the cross section are not adoptable to real soft materials of biological fibers. In this paper, the dynamic equations of a rod with a circular cross section are established on the basis of the exact Cosserat model by considering the tension and the shear deformations. Euler's angles are applied as the attitude representation of the cross section. The deviation of the normal axis of the cross section from the tangent of the centerline is considered as the result of the shear deformation. Lyapunov's stability of the helical equilibrium is discussed in static category. Euler's critical values of axial force and torque are obtained. Lyapunov's and Euler's stability conditions in the space domain are the necessary conditions of Lyapunov's stability of the helical rod in the time domain. 展开更多
关键词 exact Cosserat model Kirchhoff's rod Lyapunov's stability Euler's load
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基于T-S模糊逻辑的混合储能孤岛直流微电网功率分配控制
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作者 张伟杰 顾吉鹏 +3 位作者 张有兵 杨晓东 娄伟 汪斌杰 《电力自动化设备》 EI CSCD 北大核心 2024年第6期135-144,共10页
在含混合储能的直流微电网中,传统阻容下垂控制无法解决由线路电阻和负荷功率波动导致的系统功率分配失衡问题。为此,提出一种基于Takagi-Sugeno(T-S)模糊逻辑的自适应阻容下垂控制方法以实现混合储能的分频分配。根据蓄电池和超级电容... 在含混合储能的直流微电网中,传统阻容下垂控制无法解决由线路电阻和负荷功率波动导致的系统功率分配失衡问题。为此,提出一种基于Takagi-Sugeno(T-S)模糊逻辑的自适应阻容下垂控制方法以实现混合储能的分频分配。根据蓄电池和超级电容的物理特性,建立单个蓄电池支路输出电压、蓄电池组间输出功率差额和阻性下垂系数之间的T-S模糊逻辑关系,以及单个超级电容支路输出功率及其变化率、超级电容组间功率差额和容性下垂系数之间的T-S模糊逻辑关系,并由此构建基于T-S模糊逻辑的阻容下垂控制器。推导含混合储能的直流微电网中各部分的平均阻抗模型,并采用阻抗比分析法对微电网的小信号稳定性进行研究。MATLAB/Simulink仿真结果表明,基于T-S模糊逻辑的阻容下垂控制可保证在线路电阻和负荷功率波动情况下系统功率的合理分配。 展开更多
关键词 直流微电网 混合储能 T-s模糊逻辑 功率分配 稳定性分析
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Asymptotic stability for impulsive functional differential equations 被引量:1
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作者 罗治国 罗艳 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2009年第10期1317-1324,共8页
In this paper, we investigate the stability of a class of impulsive functional differential equations by using Lyapunov functional and Jensen's inequality. Some new stability theorems are obtained. Examples are given... In this paper, we investigate the stability of a class of impulsive functional differential equations by using Lyapunov functional and Jensen's inequality. Some new stability theorems are obtained. Examples are given to demonstrate the advantage of the obtained results. 展开更多
关键词 stability impulsive functional differential equation Lyapunov functional Jensen's inequality
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S-(-)-尼古丁-己二酸盐的制备、特性及其应用研究
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作者 肖智心 李江 +2 位作者 黄晓江 何世波 刘明星 《化学研究与应用》 CAS 北大核心 2024年第9期2184-2189,共6页
S-(-)-尼古丁的获取主要是通过从烟叶等植物中提取,获取途径受限,本研究以2′-羟基尼古丁为原料通过还原、化学拆分制备S-(-)-尼古丁;选用己二酸与S-(-)-尼古丁通过超声法制备S-(-)-尼古丁-己二酸盐,优化了合成工艺。产物利用ESI-MS、^(... S-(-)-尼古丁的获取主要是通过从烟叶等植物中提取,获取途径受限,本研究以2′-羟基尼古丁为原料通过还原、化学拆分制备S-(-)-尼古丁;选用己二酸与S-(-)-尼古丁通过超声法制备S-(-)-尼古丁-己二酸盐,优化了合成工艺。产物利用ESI-MS、^(1)H NMR、HPLC进行表征;采用HPLC进行抗氧化性分析;利用热重分析仪进行热稳定性分析。结果表明在反应的最佳工艺条件下S-(-)-尼古丁总产率达55.1%,比旋光度为-141.5°,光学纯度为99.23%;S-(-)-尼古丁-己二酸盐的产率达94.4%,纯度为99.36%;S-(-)-尼古丁-己二酸盐的抗氧化性和热稳定性均优于S-(-)-尼古丁。本研究提供了一条切实可行的S-(-)-尼古丁及其己二酸盐的合成路线;S-(-)-尼古丁-己二酸盐有效避免了S-(-)-尼古丁易氧化、受热不稳定等不足,具有良好的应用前景。 展开更多
关键词 s-(-)-尼古丁 s-(-)-尼古丁-己二酸盐 抗氧化性 热稳定性
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Stability of a Neutral Stochastic Functional Differential Equations 被引量:1
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作者 LI Bi-wen~1,21. Department of Mathematics, Hubei Normal University, Huangshi 435002, Hubei, China 2. Department of Mathematics, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China 《Wuhan University Journal of Natural Sciences》 EI CAS 2005年第6期957-960,共4页
Sufficient condition for stochastic unifrom stability of a neutral stochastic functional differential equation is given, especially, new techniques are developed to cope with the neutral delay case, we obtained the su... Sufficient condition for stochastic unifrom stability of a neutral stochastic functional differential equation is given, especially, new techniques are developed to cope with the neutral delay case, we obtained the sufficient condition for asymptotic stability of neutral stochastic differential delay equations. Due to the new techniques developed in this paper, the results obtained arc very general and useful. The theory developed here gives a unified treatment for various asymptotic estimates e.g. exponential and polynomial bounds. 展开更多
关键词 Lyapunov function D operator It's formula stochastic unifrom stabillty asymptotic stability
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Stability constants of Sb^5+with Cl−and thermodynamics of Sb−S−Cl−H2O system involving complex behavior of Sb with Cl 被引量:1
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作者 Gang LI Yun-tao XIN +3 位作者 Xiao-dong Lü Qing-hua TIAN Kang YAN Long-gang YE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第12期3379-3389,共11页
The stability constants of Sb^5+with Cl−as well as thermodynamics of the Sb−S−Cl−H2O system were calculated.The stability constants of Sb5+with Cl−were obtained by theoretical calculations of the absorbance of a Sb5+-... The stability constants of Sb^5+with Cl−as well as thermodynamics of the Sb−S−Cl−H2O system were calculated.The stability constants of Sb5+with Cl−were obtained by theoretical calculations of the absorbance of a Sb5+-containing solution at different Cl^−concentrations,which was detected by spectrophotometric analysis at certain wavelengths of light(380 nm).The logarithmic values versus 10 of stability constants of Sb^5+with Cl−were 1.795,3.150,4.191,4.955,5.427 and 5.511,respectively,and partly filled the data gaps in the hydrometallurgy of antimony.The presence and distribution of pentavalent antimony compounds under different conditions were analyzed based on equilibrium calculations.Thermodynamic equilibrium calculations were performed for Sb−S−Cl−H2O system,which included the complex behavior of Sb with Cl,and the equilibrium equations of related reactions in this system were integrated into the potential−pH diagram. 展开更多
关键词 complex behavior stability constant thermodynamics sb−s−Cl−H2O system
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