Literature overview of basic characteristics and flotation laws of flocs

Flocculation flotation is the most efficient method for recovering fine-grained minerals,and its essence lies in flotation and recovery of flocs.Fundamental physical characteristics of flocs are mainly determined by their apparent particle size and structure(density and morphology).Substantial researches have been conducted regarding the effect of floc characteristics on particle settling and water treatment.However,the influence of floc characteristics on flotation has not been widely studied.Based on the floc formation and flocculation flotation,this study reviews the fundamental physical characteristics of flocs from the perspectives of floc particle size and structure,summarizing the interaction between floc particle size and structure.Moreover,it thoroughly discusses the effect of floc particle size and structure on floc floatability,further revealing the influence of floc characteristics on bubble collision and adhesion and elucidating the mechanisms of interaction between flocs and bubbles.Thus,it is observed that floc particle size is not the only factor influencing flocculation flotation.Within the appropriate apparent particle size range,flocs with a compact structure exhibit higher efficiency in bubble collision and adhesion during flotation,thereby resulting in enhanced flotation performance.This study aims to provide a reference for flocculation flotation,targeting the development of more efficient and refined flocculation flotation processes in the future.

Synthesis of a Weak Basic uPA Inhibitor and Crystal Structure of a Complex with uPA

As a trypsin-like serine protease, Urokinase-type plasminogen activator （uPA） plays a key role in a range of biological processes including plasminogen activation, angiogenesis, wound healing, tissue remodeling, tumor growth and tumor metastasis, uPA is shown as the most validated marker for prognosis of breast cancer. Inhibitors of uPA may then be useful in the treatment of cancer by retarding tumor growth and metastasis. Most current uPA inhibitors employ a highly basic group （amidine or guanidine group） to target the primary specific pocket of uPA active site, which leads to poor oral bioavailability. Here, a uPA inhibitor with weak basic P1 group, 2-（2-amino- benzothiazole-6-carboxamido）acetic acid （ABTCA）, was synthesized and reported here. In addition, we also determined the crystal structure of ABTCA in complex with uPA. The structural information will be useful for further improvements of potency and selectivity of this promising new type ofuPA inhibitors.

Source Rock Classification and the Basic Structure of Coal and Kerogen

In accordance with the confusion on classification of source rocks, the authors raised a source rock classification for its enriched and dispersed organic matter types based on both Alpern’s idea and maceral genesis/composition. The determined rock type is roughly similar to palynofacies of Combaz , whereas it is "rock maceral facies (for coal viz. coal facies)" in strictly speaking. Therefore, it is necessary to use the organic ingredients classification proposed by the authors so that it can be used for both maceral analysis and environment research . This source rock classification not only shows sedimentology and diagenetic changes but also acquires organic matter type even if hydrocarbon potential derived from maceral’s geochemical parameters. So, it is considered as genetic classification. The "rock maceral facies" may be transformed to sedimentary organic facies , which is used as quantitative evaluation means if research being perfect.Now, there are many models in terms of structure either for coal or for kerogen. In our opinion, whatever coal or kerogen ought be polymer, then we follow Combaz’s thought and study structure of amorphous kerogens which are accordance with genetic mechanism showing biochemical and geochemical process perfectly. Here, we use the time of flight secondary ion mass spectrometry (TOFSIMS) to expand Combaz’s models from three to five. They are also models for coal.

Control of Melt Structures on Cu-Au Mineralization in Basic-Ultrabasic Complexes of Northern China

Based on systematic analyses of 72 samples of different basic-ultrabasic rocks, the present paper discusses the relationship between melt structure and Cu and Au mineralization. It is found that if the NBO/T, NBO, M2+, FeO and MgO values are relatively high and the T, M3+, Fe2O3 and CaO values are low the basic-ultrabasic melt will be favourable to Cu (Ni) mineralization, but if the former are low and the latter are high it is favourable to Au metallization. Cu ions occupy dominantly octahedra in basic-ultrabasic melt and the higher the NBO/T, NBO and M2+ values, the more the octahedra in the melt. Au element mainly takes the form of Au+ ions in basic-ultrabasic melt and the Au+ ions constitute tetrahedral sites together with Fe3+ ions. Therefore, low M2+ and high Fe3+, i.e. high oxygen fu-gacity, can promote the enrichment of Au+ ions and Au mineralization. Components NT (other than Au+), Al2O3 and SiO2 in basic-ultrabasic melt have no effect on metallogenetic species. As mentioned above, in relevant diagrams distribution areas of the characteristic values of ore-free melt and those of ore-forming melt are overlapped in different degrees, which possibly indicates that not all the magmas have mineralizing ability. It can be well distinguished whether basic-ultrabasic rocks are favourable to Cu or Au mineralization or they are just ore-free rocks by analysing integrated diagrams of the characteristic values of the magmatic melt structure.

Numerical Investigation on Fluid Structure Interaction Considering Rotor Deformation for a Centrifugal Pump

The existing research for unsteady flow field and the corresponding flow induced vibration analysis of centrifugal pump are mainly carried out respectively without considering the interaction between fluid and structure. The ignorance of fluid structure interaction （FSI） means that the energy transfer between fluid and structure is neglected. To some extent, the accuracy and reliability of unsteady flow and rotor deflection analysis should be affected by this interaction mechanism. In this paper, a combined calculation between two executables for turbulent flow and vibrating structure was established using two-way coupling method to study the effect of FSI. Pressure distributions, radial forces, rotor deflection and equivalent stress are analyzed. The results show that the FSI effect to pressure distribution in flow field is complex. The pressure distribution is affected not only around impeller outlet where different variation trends of pressure values with and without FSI appear according to different relative positions between blade and cutwater, but also in the diffusion section of volute. Variation trends of peak values of radial force amplitude calculated with and without FSI are nearly same under high flow rate and designed conditions while the peak value with FSI is slightly smaller, and differently, the peak value with FSI is larger with low flow rate. In addition, the effect of FSI on the angle of radial force is quite complex, especially under 0.5Q condition. Fluctuation of radial deflection of the rotor has obvious four periods, of which the extent is relatively small under design condition and is relatively large under off-design condition. Finally, fluctuations of equivalent stress with time are obvious under different conditions, and stress value is small. The proposed research establishes the FSI calculation method for centrifugal pump analysis, and ensures the existing affect by fluid structure interaction.

Crashworthiness of innovative hexagonal honeycomb-like structures subjected to out-of-plane compression

Seeking for innovative structures with higher mechanical performance is a continuous target in railway vehicle crashworthiness design.In the present study,three types of hexagonal reinforced honeycomb-like structures were developed and analyzed subjected to out-of-plane compression,namely triangular honeycomb(TH),double honeycomb(DH)and full inside honeycomb(FH).Theoretical formulas of average force and specific energy absorption(SEA)were constructed based on the energy minimization principle.To validate,corresponding numerical simulations were carried out by explicit finite element method.Good agreement has been observed between them.The results show that all these honeycomb-like structures maintain the same collapsed stages as conventional honeycomb;cell reinforcement can significantly promote the performance,both in the average force and SEA;full inside honeycomb performs better than the general,triangular and double schemes in average force;meanwhile,its SEA is close to that of double scheme;toroidal surface can dissipate higher plastic energy,so more toroidal surfaces should be considered in design of thin-walled structure.These achievements pave a way for designing high-performance cellular energy absorption devices.

Image segmentation of small defects in precision weldments with complex structure

In this paper, the X-ray nondestructive test method of small defects in precision weldments with complex structure was presented. To resolve the difficulty of defect segmentation in variable grey image, the image processing based on Visual Basic programming method was adopted. The methods of automatic contrast and partial grey stretch were used to enhance the X-ray detection image which has relatively low contrast, then automatic threshold method was carried out to segment the two high intensity zones, and weld zones which contain the small defects was extracted. Smoothing and sharpen processing were proceeded on the extracted weld zones, and small defects in X-ray detection image of weldments with complex structure were segmented by using the method of background subtraction in the end. The effects of raster were eliminated, and because of that the image processing was only proceeded on the extracted weld zones, the calculated speed using the above provided algorithm was improved.

A New Complex [Ni(L)_2]·2H_2O Containing an Interesting Six-membered Water Ring (HL=2-Iminomethyl-6-methoxy-phenol)

A new complex, [Ni（L）2]·2（H2O） I （HL = 2-iminomethyl-6-methoxyphenol）, has been synthesized and structurally determined. The crystal belongs to the trigonal system, space group R3- with a = 1.9341 （3）, b = 1.9341 （3）, C = 1.2048（2） nm, V = 3.9029（11） nm^3, Mr = 395.05, Z = 9, Dc = 1.513 g·cm^-3, F（000） = 1854,μ= 1.153 mm^-1 and S = 1.014. Each Ni^Ⅱ atom is four-coordinated by two N and two O atoms from two different L anions to give a slightly distorted square-plane geometry. The complex forms a 3-D network structure through N-H...O and O-H...O hydrogen bonds containing an interesting six-membered water ring.

Basic Structural Forms of Main Roof

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Optical transmission through basic-structural-unit superlattices

In this paper, by the transparent-component-decimation （TCD） method we obtain three kinds of new basic- components （BCs） through simplifying and decomposing the BCs of three-component Thue-Morse （3CTM） sequence. Based on these new BCs we propose a type of basic-structural-units （BSUs） and investigate the optical transmission of the one-dimensional （1D） superlattices composed of these BSUs. It is found that if the substrates of the 1D BSU superlattices are certain, the optical transmission at the central wavelength （CW） will be determined completely by the number and the type of BSUs and has nothing to do with the marshalling sequence. In particular, if the substrates are identical, the numbers of different types of BSUs are all the same and the middle two elements of BSUs constitute a cycle, then no matter whether the system is periodic, or quasiperiodic, or aperiodic, or unordered, or even random, it will be transparent at the CW. The conclusion is confirmed by the numerical results. Similar to the even layers of neighbourhood identical elements in TCD method, such a kind of optical BSU subsystem can also be decimated from the chain in the process of transmission investigation. There would be a potential application in the designing of some interesting optical devices.

THE STATUS QUO AND STRUCTURAL READJUSTMENT FOR BASIC RESEARCH IN THE CAS

The implementation of structural readjustment is the strategic consideration to deepening reforms in the Chinese Academy of Sciences (CAS). and the readjustment of basic research is one of its major contents. By analyzing the historical roles, status quo and existing problems in CAS basic research, this article points out the needs for structural readjustment and puts forward some suggestions on this point in basic research in the context of the possible models of basic structural units for basic research and their ways of combination as well as the implementing procedures of structural readjustment.

Steady State Solution and Stability of an Age-Structured MSIQR Epidemic Model

The importance of epidemiology in our life has stimulated researchers to extend the classic Susceptibles-Infectives-Removed (SIR) model to sophisticated models by including more factors in order to give detailed transmission dynamics of epidemic diseases. However, the integration of the quarantine policy and age-structure is less addressed. In this work we propose an age-structured MSIQR (temporarily immune-susceptibles-infectives-quarantined-removed) model to study the impact of quarantine policies on the spread of epidemic diseases. Specifically, we investigate the existence of steady state solutions and stability property of the proposed model. The derived explicit expression of the basic reproductive number shows that the disease-free equilibrium is globally asymptotically stable if, and that the unique endemic equilibrium exists if. In addition, the stability conditions of the endemic equilibrium are derived.

The New Detection and the Basic Characteristics of the Structural System of Taiwan Region of China—Using the Earth Satellite's Remote-sensing Images to Explain the Structural System of Taiwan Region of China

This text uses the regional geological investigation data and the remote sensing image data of earth-satellite remote sensing to synthetically analyze the structural system of Taiwan region of China. Authors detection-marked and assurance-marked and divided 5 kinds of structural system of the Taiwan region: (1) the wreath-shaped structural system, (2) the N-N-E oriented structural system, (3) the S-N oriented structural system, (4) the N-E oriented structural system, (5) the arc-shaped structural system. Combination of the texture faces and associated method were adopted to recover and reconstruct the structural evolution sequences and the formation periods. In this paper, problems such as the development process in geology etc. are also discussed, contributing new information to research the structural field of the East Asia and its tectonic plate movements and structural actions inside the land plate .

基于OSCE考试成绩的临床基本技能教学同质化分析

目的:查找和改进临床医学专业学生临床实践教学中的薄弱环节,提高实践教学质量。方法:以沈阳某医学院校在12个实践教学基地实习的2016级临床医学专业参加毕业技能考试的291名实习学生作为研究对象,采用单因素方差分析和Kruskal-Wallis检验分析其客观结构化临床考试(objective structured clinical examination,OSCE)的临床基本技能成绩。结果:在标准化病人问诊及查体成绩中,H实践教学基地的及格率和平均分均最低,其实习学生的平均分与A、B、F、G、K、L实践教学基地实习学生比较差异有统计学意义(P<0.01)。在技能操作成绩中,H实践教学基地及格率和平均分最低,其实习学生的平均分与A、D、E、F、G、I、J、K实践教学基地实习学生比较差异有统计学意义(P<0.01)。在辅助检查结果判读成绩中,H实践教学基地及格率和平均分最低,A、H基地实习学生的平均分与B、J基地实习学生的平均分比较差异有统计学意义(P<0.01)。结论:不同实践教学基地的学生实习效果存在较大差异,医学院校要加强对实践教学基地的管理,确保临床实践教学质量同质化。

艺术设计专业基础课程结构的整合重构与教学模式的创新改革

艺术设计专业教育秉持“新文科”“大艺术”“大设计”“大基础”的教学理念,重视设计本身的特点,重点放在制定集多种专业能力于一体的设计基础能力的培养目标、细化基础课程的教学目标、细化教学组织方式和教学内容、建立完善的评价标准等方面。基础教育与专业教育是递进、交叉和融合的关系,而不是孤立、隔绝的状态。文章强调以跨学科意识构建整体格局,将全学科教学资源优化整合,注重基础知识的应用,打破专业的壁垒。

健康管理护理基本技术质量控制与评价指标体系的构建

目的:构建健康管理护理基本技术质量控制与评价指标体系,为健康管理护理基本技术规范化、同质化管理提供参考依据。方法:在三维质量结构理论基础上,采用文献检索法、研究小组讨论和德尔菲专家函询法,筛选指标并量化质量控制与评价的维度、条目及各级评价指标。结果:最终形成健康管理护理基本技术质量控制与评价指标体系,包括一级指标3项,二级指标10项,三级指标51项。2轮专家函询问卷有效应答率均为94.4%,函询专家的权威系数为0.879,第1、第2轮咨询的肯德尔和谐系数分别为0.210、0.199,均P<0.001。结论:本研究构建的健康管理护理基本技术质量控制与评价指标体系科学、有效、客观、可操作,对规范健康管理护理服务实践、培训和考核具有参考意义,也可为健康管理机构开展健康管理护理基本技术质量控制提供可借鉴的指标。

Wittig反应实验的绿色化改进

传统的有机化学实验教学中,大多侧重实验技能的训练,设置实验内容时对实验安全性、经典性和可重复性等因素考虑较多,而对反应的绿色化、新方法和新技能等重视程度不够。为此,经典的有机反应也需要不断改进,本文将需要在大量有机溶剂中进行的传统Wittig反应改进为无溶剂的固相研磨反应,使得合成方法更加简单、绿色、安全和高效。设计合成了3个不同推拉型(D-π-A)二苯乙烯结构分子,优化了反应条件,测定了它们的光谱性质,并对其进行比较,讨论其构性关系,不仅引入绿色化学理念,而且对知识进行扩展,增加了实验的新颖性、探索性和趣味性,提升了学生创新能力。

侨校境外生班钢结构基本原理课程思政建设与探讨

近年来,将思想政治教育融入专业课程教学成为各大高校的共识。教师在传授专业知识的同时也要加强对学生思想品德的培养。华侨大学作为一所传统侨校,更要注重在专业课堂教学中做好境外生的思想政治工作,不仅要让学生更好地适应专业学习和独立生活,而且要让学生正确地认识中国的文化背景与发展现状。以钢结构基本原理课程为例,多维度分析课程定位、课堂教学以及毕业要求,明晰课程思政育人目标。钢结构基本原理课程与工程实践联系紧密,在课程思政设计时,应注重搜集钢结构相关工程项目、行业翘楚与中国传统文化等案例,从中挖掘具有思政内涵的教学元素,深度融合教学设计与思政育人。此外,从课前预习辅导、课中理论教学和课后实践教学三个环节,探析课程思政融入专业基础课程教学的路径,落实课程思政目标,增强学生的文化认同感和民族自豪感。

中国共产党推进中华民族共同体意识成长的历史进程与基本经验

中华民族共同体意识是在客观历史进程与主观人为建构相互耦合的“双螺旋结构”中得以生成发展的。中国共产党自成立以来就有意识地推进中华民族共同体意识成长,成为引领这项事业发展的核心力量。运用文本分析、历史分析和规范分析方法梳理百余年来中国共产党推进中华民族共同体意识成长进程,可以将其划分为五个阶段,分别是建党到新中国成立时期从“自在”到“自觉”的初步探索、新中国成立到社会主义改造基本完成时期从“自觉”到“自为”的逐渐成熟、全面建设社会主义时期的曲折与徘徊、社会主义建设新时期的复苏与加速,以及新时代以来在“自为”之路全方位、多维度的成长与迈进。百余年来中国共产党推进中华民族共同体意识成长经验表明:必须坚持党的领导;中华民族愿意接受并坚决拥护党的领导。这是中国共产党推进中华民族共同体意识成长不断走向胜利的首要前提和根本原因。