Contribution of components from volume defect in natural pyrite and quartz to solution chemistry of flotation pulp

The volume defects in pure pyrite and quartz from a classical Cu-Pb-Zn-Fe sulfide deposit were investigated.The results indicate that a large number of volume defects exist in natural pyrite and quartz.The volume defects assume a variety of shapes,including long strips,oval shapes and irregular shapes,with sizes ranging from a few microns to dozens of microns.These volume defects are rich in metallogenic elements as a result of the capture of metallogenic and mineralizing fluid during the defect-forming process.The volume defects are fractured during the grinding process,and their chemical components are released into the solution,as confirmed by the abundant presence of various metal and non-metal components in the cleaning water and EDS results.Under the experimental conditions of 10 g pyrite or quartz with grinding fineness of d90=37 μm,which was cleaned in 40 m L of pure deionised water under an inert atmosphere,the total average concentrations of Cu,Pb,Zn,Fe,Ca,Mg and Cl-in the aqueous solution are 32.09×10^-7,16.51×10^-7,19.45×10^-7,516.52×10^-7,129.50×10^-7,35.30×10^-7 and 433.80×10^-7 mol/L,respectively,for pyrite and 19.20×10^-7,8.88×10^-7,8.31×10^-7,82.71×10^-7,16.21×10^-7,4.28×10^-7 and 731.26×10^-7 mol/L,respectively,for quartz.These values are significantly greater than those from the experimental non-oxidative dissolution of the pyrite or quartz,respectively.Therefore,the metallogenic fluid in volume defects of mineral crystal is concluded to represent the dominant contribution to the solution chemistry of sulfide flotation pulp.The present investigation will help to deeply understand the flotation theory of sulfide minerals.

米伟英与爱心“豆宝宝”

每天清晨,在河北省张家口市区的大街小巷和各个住宅小区,人们会看到一个个统一着装、统一行动的下岗职工推着一辆辆统一型号、统一标识、新颖整洁的"爱心豆宝宝"早餐车,这一辆辆写着"爱心"字样的早餐车已经成为张家口一道靓丽的风景线。而这道风景的背后,是一个下岗女工艰辛创业的故事。

Correlation between Chinese learners＇ tolerance of ambiguity and their English achievement

Tolerance of ambiguity, an important emotional factor, imposes vital influence on second language acquisition. In this study, questionnaires are adopted to investigate the correlation between non-English major＇s tolerance of ambiguity and their English achievement. The result shows that students with different degrees of tolerance of ambiguity can be significantly different in their language performance. Based on the analysis, this article proposes some effective measures to improve the degree of tolerance of ambiguity in English teaching.

On Formative Assessment in College English Teaching

Teaching assessment plays a very important part in college English teaching, and effective formative assessment can encourage students＇ learner autonomy, improve their ability, and stimulate their creativity as well. Based on the foreign and domestic studies, this paper first reviews the definition and types of assessment, and then analyses the factors which influence the application of formative assessment in the process of college English teaching.

The application of formative assessment in college oral English teaching

Teaching assessment is one of the most important components of college English teaching. The traditional assessment system over emphasizes the summative assessment, which used examinations as the main assessment method. Formative assessment focuses on the process assessment during the practice of teaching. It is integrated in the teaching and learning process and cannot be separated as evaluation. The formative assessment aims to confirm the students＇ potential, develop their ability in study and strengthen the students＇ confidence and the spirit of cooperation. It is also a method intended to generate feedback on performance to improve and accelerate teaching and learning effectively. Based on some theories, this paper states the importance of the application of formative assessment in college oral English teaching. It also introduces some principles and measures to apply this assessment. The reasonable and effective application can promote college oral English teaching.

Current investigation and analysis of formative assessment in college oral English teaching

This article investigates and analyzes the current circumstances of formative assessment in college oral English teaching. The result shows： （1） students still have some difficulties in the process of oral English formative assessment; （2） students are not accessible to abundant formative assessment approaches; （3） teachers play an unsatisfactory role in the process of oral English formative assessment. Finally, this article offers some advice on figuring out the problems above.

Decomposition Kinetics for Formation of CO_2 Hydrates in Natural Silica Sands

The decomposition kinetics for formation of CO2 hydrates in 90 cm 3wet natural silica sands were studied systematically using the depressurization method at the temperatures ranging from 273.2 to 277.2 K and the pressures from 0.5 to 1.0 MPa.The effects of temperature,pressure,particle diameter,porosity,and salinity of formation water on the decomposition kinetics were investigated.The results show that the dissociation percentage increases as temperature increases or as the initial decomposition pressure decreases.An increase in porosity or a decrease in particle diameter of silica sands accelerates the decomposition.Increasing the salinity of the formation water gives rise to a faster decomposition.However,a combination of the present results with the observations in literature reveals that the effect of the coexisting ionic solute depends on its chemical structure.

Exploring Senior High School Students’ English Academic Resilience in the Chinese Context

While academic resilience has been a hot topic in positive psychology,there is still scope for researchers to explore it in the field of applied linguistics.Drawing on the framework of L2(second language) learners’ resilience proposed by T.Y.Kim and Y.K.Kim(2017),the current study aims to examine senior high school students’ English academic resilience(EAR) and its relationship to their English achievement(EA).This study comprises a survey of 454 senior high school students.Follow-up interviews were carried out to triangulate the quantitative findings.The descriptive results demonstrate that students’ EAR is above the average,and its five subscales obtain medium to medium-higher levels due to the mean scores.It shows that students have good EAR that enables them to deal with academic adversity.The correlational analysis shows a low positive correlation between EAR and EA in general,and the subscales share medium to low correlations with students’ EA.EAR has a certain influence on EA,but the correlation may be influenced by other learner variables.Based on the results,suggestions on improving students’ EAR are provided.

On translatability of idioms

While translating the source language, one is inevitably introducing the culture. Approaches to culture involved in translation may be divided into two different methods： alienation （SL-culture oriented） and adaptation （TL-culture oriented）. Idioms with rich national characteristics and specific linguistic features are called ＂concentrated culture＂. Therefore in idiom translation, there exist to some extent linguistic untranslatability and cultural untranslatability. In this paper, the author proposes to discuss the translatability of idioms and different approaches in English-Chinese/Chinese-English idiom translation.

Formation mechanism of breccia pipe type in Yixingzhai gold deposit

Based on the basic geological features of Yixingzhai gold deposit, the geological features, classification and relation to mineralization of breccia pipes were discussed by surveying the xenoliths and breccia's mineral composition, structure and construction, typical mineralization alteration phenomenon on field and microscopic anatomy in breccia pipes. And the ore-controlling mechanism and the formation mechanism of the blasting breccia pipes were investigated. The main conclusion shows that Hewan and Nanmenshan breccia pipes nearby the NW-striking deep fault are shaped earlier, belonging to the acidic siliceous ingredient production of ultra-hypabyssal magmatic in the late magma stage; Tietangdong and Nanmenshan breccia pipes that are shaped latter are the ultra-hypabyssal auriferous fluid production composed mainly of the skarn in the hydrothermal stage after the magma period. Both root in the unified deep magmatic chamber, belonging to differentiation derivatives at different stages in the deep magmatic chamber.

Study on the formation factors of China＇s negative image under the perspective of contemporary British and American media and the countermeasures

Against globalization, national image has become important strategic resource and a clear understanding of China＇s image in western countries is greatly beneficial to China＇s development and rise. This paper through studying China＇s image in contemporary British and American academia and press probes into the negative image, analysing the background and reason of its formation to give inspiration for the construction of national image under globalization.

黑龙江省蜂斗菜生产前景及主要栽培技术

蜂斗菜产业属于劳动密集型产业,目前,日本由于劳动成本高昂,出于降低成本的考虑,将绝大部分的蜂斗菜的生产外包,国内保留少量栽培供鲜食。我们应抓住日本产业外迁的机遇,扩大出口。蜂斗菜在黑龙江生长加工的时期正好与传统农时错开,栽种在4月底,收割和加工在8、9月份,不耽误农时,也给农闲时在家的农民提供了一条增收的途径。

Influence of dioxin reduction on chemical composition of sintering exhaust gas with adding urea

With the addition of urea as an inhibitor, four groups of reducing dioxin emission experiments in sintering pot were conducted. The results show that, adding 0.05%, 0.1% and 0.5% （mass fraction） urea, the emission concentrations of dioxin are 0.287 0.258 and 0.217 ng-TEQ/m3, respectively. The dioxin emission rates drop substantially compared to 0.777 ng-TEQ/m3 flee of urea. With an increase of the urea content, the concentration of SO2 emission reduces sharply. （NH4）2SO4, formed by the reaction of SO2 and NH3, goes into the dust and part of NH3 is released before reaction with the emission of exhaust gas. The NO~ emission presents an increasing trend because the reaction of NH3 and 02 at high temperature produces NOx. Based on the consideration of factors such as the effect of reducing dioxin emission, and the chemical composition of exhaust gas, 0.05% is the optimum adding content of urea.

On appropriately assessing students＇ learning outcomes

Some students make negative comments on their learning outcomes after two years＇ college English learning. The article is to investigate factors influencing students＇ evaluation of their learning, including students＇ self-efficacy, learning strategies and different categories of achievement goals.

On the Causes of Negative Impact of CET-4

As one of the world well-known high-stakes tests, CET-4 （College English Test Band 4） changed from being generally accepted to being widely questioned in the past 25 years. In spite of a series of reforms of CET-4, the negative impact of CET-4 remains intense. Three main reasons are probed into here. Firstly, the objective of CET-4 is ambiguous. Secondly, the test objective does not accord with teaching objective. Finally, test contents do not match well with the practical language use. To improve the present passive state of CET-4, some suggestions are given.

Numbers in English and Chinese language use

The cultural connotations of numbers in English and Chinese languages are demonstrated to discuss the grammatical functions of the numbers and their rhetoric usages. For a foreign language learner, it is essential that they know not. only the denotation of the numbers, but also the connotation of the numbers. Numbers frequently play an important role in dally communication.

The Influence of English Movies on English Listening Teaching in College

Listening, in language teaching, is a skill that requires active engagement. To help their students become effective listeners becomes one of the great challenging tasks for the language teachers. In the Chinese contexts, this challenge is greater for college English teachers, for listening skills, an important part of communication skills, have not been given as much attention as reading or writing skills in teaching non-English majors, especially a decade ago. This paper introduces English movies on English listening teaching in college, and puts forward some application strategies of English movies in English listening teaching.

Social Background and Elite Composition： Jewish Political Elite During the British Mandate

This article, which utilizes the quantitative social-background approach, sets as its objective to empirically discern correlations between the behavior of the Jewish political elite, embodied in the Jewish Agency for Palestine in the period from 1921 to 1948, and the following social-background variables： age, foreign travel, occupation as a path to political power, regional affiliation, ideology, and political opportunity, of the JAE membership. Diversity of the social-background variables and, particularly, the multitude of languages they knew, explain, to a considerable extent, firstly, the wide variety of their social, political and economic views, and, secondly, the elite＇s resort to direct contact with Western governments and peoples in communicating and promoting their political ideology, thus facilitating the realization of the Zionist project.

Present Situation and its Causes of College English Learning and Practice Environment in China

Language learning must be conducted on the basis of acquisition, and the acquisition needs a certain environment as the material guarantee for the implementation of the learning activities. In China, English teaching lacks an advantageous learning environment as a Foreign Language （EFL） Teaching, which is one of main factors that more time is spent on the teaching but efficiency is not improved correspondingly. Therefore, we should attach more importance to the present situation and its causes. In this essay, present Situation is analyzed through the practical research, and the causes are explored to help to improve the efficiency of foreign language learning.

The Effect of Different Types of Corrective Feedback on L2 Writing Accuracy of college students

Since the process writing was raised in the L2 writing in 1970s, the feedback has been an important part of teaching. A range of researchers have investigated the effect of different types of error feedback to find whether the feedback can help L2 writers improve the accuracy of their writing. Similar to the previously discussed question, they have also reached rather controversial conclusions. Most often, these studies have categorized corrective feedback as either direct or indirect. To explore the effects of corrective feedback in L2 writing, the paper investigated the types of feedback given to 30 college students of Tianhe College in Guangdong province. The study improved that correction feedback can improve accuracy in student writing.