scholarly journals Paste Pipeline Transportation of Pumping Backfill Technology with Long Distance and High Stowing Gradient in Cold and High-Altitude Areas

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Wei-jun Liu ◽  
Min Chen ◽  
Fei-fei Wang ◽  
Ren-ze Ou ◽  
Qi Liu
Keyword(s):  
High Altitude ◽  
System Analysis ◽  
Chemical Properties ◽  
Poor Quality ◽  
Economic Benefits ◽  
Pipeline Transportation ◽  
Long Distance ◽  
Mass Fractions ◽  
Cement Binder ◽  
Backfill Strength

A paste pipeline transportation of pumping backfill technology with long distance and high stowing gradient is proposed to solve the problem of filling slurry transportation with low concentration, the filling body poor quality, and the transportation difficulties with long distance and high stowing gradient in Heiniudong copper mine (HCM). The physical and chemical properties of the backfill material, backfill proportion test, circular pipe experiment, and backfill system analysis evaluation were studied in the laboratory and outdoor, and the application in HCM was carried out to evaluate the technology. The research results show the feasibility of considering classified tailings and binder as backfill aggregates, and the optimum proportion of cement-binder-classified tailings applied in the stope and goaf is 1 : 4 : 8 and 1 : 4 : 15, respectively, with paste rheological properties of mass fractions of both being 74%∼76% and the backfill strength of about 1.5 MPa at 28 d. Furthermore, when backfill proportions and rate of flow are 1 : 4 : 8 and 50 m3/h, the pressure loss of the pipeline is around 0.4 MPa/100 m, and the backfill pump meets the backfill requirements. On this condition, the technology is capable of obvious economic benefits with the backfill cost of only 25.56 yuan/t, remnant ore recovery rate of 80%, and new output value of 1.28 billion. It creates a precedent for the paste pumping backfill technology with long distance and high stowing gradient in cold and high-altitude areas. The technology also provides reference mining experience for similar mines.

scholarly journals High-Altitude and Long-Distance Flights

Nature ◽  
1935 ◽  
Vol 135 (3409) ◽  
pp. 335-336
Keyword(s):  
High Altitude ◽  
Long Distance

scholarly journals Altitudinal variations in soil physico-chemical properties at cold desert high altitude

2013 ◽  
pp. 0-0 ◽  
Author(s):  
G Charan ◽  
V K Bharti ◽  
S.E Jadhav ◽  
S Kumar ◽  
S Acharya ◽  
...  
Keyword(s):  
High Altitude ◽  
Chemical Properties ◽  
Cold Desert ◽  
Physico Chemical

Structural and Coal-Controlled Characteristics of Boli Coal Basin

2013 ◽  
Vol 807-809 ◽  
pp. 2220-2223
Author(s):  
Ai Jun Guo ◽  
Hao Xu ◽  
Li Min Chen ◽  
You Fei Li
Keyword(s):  
Active Zone ◽  
System Analysis ◽  
Poor Quality ◽  
Geological Exploration ◽  
Coal Basin ◽  
The West ◽  
Coal Resources

Boli coal basin has abundant coal resources and its structure shows southward protruding arcuate structure. There is difference about basement in western and eastern, so it can be further divided into continental craton basement in west and continental craton edge active zone basement in east. For this reason, the coal-bearing strata at the west is stable and its structure is relatively simple. On the contrary the eastern coal-bearing strata is less, poor-quality and thickness is unstable. There are two groups of faults and four folds that mainly control coal-bearing strata distribution. It can be divided into six coal-controlled structural styles in Boli coal basin based on system analysis and summarized about geological exploration data.

scholarly journals Study of Socio-Economic Condition and Constraints faced by the Rice Growing Farmers in Adoption of Organic and Bio-Fertilizer in Bilaspur District of Chhattisgarh

2021 ◽  
Vol 8 (7) ◽  
pp. 43-47
Author(s):  
Ayush Emmanuel Lal ◽  
Dr. Syed H. Mazhar ◽  
Jahanara Jahanara
Keyword(s):  
Statistical Analysis ◽  
Economic Condition ◽  
Organic Fertilizer ◽  
Structured Interview ◽  
Poor Quality ◽  
Weighted Mean ◽  
Long Distance ◽  
Interview Schedule ◽  
Lack Of Knowledge

The present study was conducted in Bilaspur district of Chhattisgarh to find out socio-economic condition and constraints faced by rice growing farmers in adoption of organic and bio-fertilizer. A total of 120 respondents were selected randomly for the present study. The data was collected through a pre-structured interview schedule and later appropriate statistical analysis was done to find out meaningful results. The result showed that there were eight main constraints perceived by the farmers which were complicated method of application, long process of organic fertilizer preparation, lack of knowledge about type and recommended doses, supply agency at long distance, lack of guidance from extension personal, organic and Bio-fertilizer are costly, lack of conviction about the merits of the practice and mishandling and poor quality of bio-fertilizer out of which mishandling and poor quality of bio-fertilizer with weighted mean score of 2.47 ranked I and Long process of organic fertilizer preparation with weighted mean score of 2.16 ranked II.

Archaeology in Eastern Africa: Recent Developments and More Dates

1984 ◽  
Vol 25 (4) ◽  
pp. 369-393 ◽  
Author(s):  
Peter Robertshaw
Keyword(s):  
Iron Age ◽  
Poor Quality ◽  
Eastern Africa ◽  
East African ◽  
Long Distance ◽  
East African Coast ◽  
Northern Tanzania ◽  
Recent Developments ◽  
First Millennium ◽  
Historical Sequences

Obsidian hydration dating has been successfully applied to East African archaeological sites. Chemical sourcing of obsidian artefacts has documented long-distance movement of obsidian from the Central Rift valley. A date in the ninth or eighth century b.c. has been obtained for iron objects in the Er Renk District of the Southern Sudan. Tentative culture-historical sequences are available from excavations around the Sudd and in the Lake Besaka region of Ethiopia. Archaeological research has begun in the interior of Somalia. In northern Kenya, claims that Namoratunga II is an archaeo-astronomical site have been challenged. Excavations at Mumba-Höhle and Nasera have shed new light on the transition from the Middle to Later Stone Age in northern Tanzania perhaps 20,000 to 30,000 years ago. Knowledge of the Elmenteitan Tradition has been considerably advanced by excavations in south-western Kenya. Iron-smelting furnaces with finger-decorated bricks have been discovered in south-eastern Kenya, though not yet dated. New dates falling in the last few centuries have caused first millennium a.d. dates obtained previously for Engaruka to be rejected. Excavations at several sites on the East African coast indicate that the beginnings of coastal occupation from the Lamu archipelago to Mozambique fall in the ninth century a.d. In Malawi the Shire Highlands seem to have been settled around the tenth century a.d. Investigations of large smelting-furnaces in central Malawi indicate that they were used as concentrators of poor-quality iron ore. Excavations in rock-shelters on the southern edge of the Copperbelt have produced a culture-historical sequence spanning the last 18,000 years. The western stream of the Early Iron Age was established in the Upper Zambezi valley by about the mid fifth century a.d.

Mobility in the Mountains: Late Third and Second Millennia Alpine Societies' Engagements with the High-Altitude Zones in the Southern French Alps

2011 ◽  
Vol 14 (1-2) ◽  
pp. 88-115 ◽  
Author(s):  
Kevin Walsh ◽  
Florence Mocci
Keyword(s):  
High Altitude ◽  
Fundamental Change ◽  
Homo Economicus ◽  
Long Distance ◽  
French Alps ◽  
The Third ◽  
Economic Practices ◽  
Art Forms ◽  
Burial Rites ◽  
Alpine Space

The assessment of the important changes that occurred in late third and second millennia societies across Europe often emphasizes changes in technology and the emergence of associated objects and art forms, changes in burial rites, and developments in economic practices. Notions relating to the evolution of homo economicus dominate many of the discourses, and the evidence for increased long-distance trade / contact across Europe is used to bolster this assessment. These themes are underpinned by an obsession with ever-refined chrono-typological phases. In an attempt to present a more socially embedded perspective, this paper considers the changes that occurred in the uses of the high-altitude, sub-alpine, and alpine zones in the southern French Alps during the third and second millennia BC. From c. 2500 BC onwards, there was a fundamental change in the use of and engagement with this landscape. The first substantial stone-built pastoral structures at high altitude (2000 m and above), appear at this time. This departure in the use and structuring of the alpine space would have included concomitant changes in the nature of mobility, notions of territory, and memories associated with this area.

Access to healthcare

2020 ◽  
pp. 69-81
Author(s):  
Martin Gulliford
Keyword(s):  
System Analysis ◽  
Quality Care ◽  
National Level ◽  
Poor Quality ◽  
Access To Healthcare ◽  
Cultural Barriers ◽  
Health Coverage ◽  
Human Right ◽  
Care Access ◽  
Care Services

Access to healthcare is concerned with the processes of gaining entry to the healthcare system. Analysis of access focuses on inequality and inequity in the availability and use of health services. In order to address global inequalities in access to healthcare, international organizations have promoted access to healthcare as a human right. This is linked to the ideal of universal health coverage, with shared funding of some or all healthcare for everyone, as a key strategy for achieving this. At a national level, rational strategies for resource allocation and priority setting are used to promote equity of access in terms of equal access for equal need, but historical inequalities based on the ‘inverse care law’ have been resistant to change. In health systems led by primary care, access to a general practitioner (GP) tends to reduce inequalities in ‘entry’ access to the health system, but the gatekeeping role of GPs may contribute to the development of inequalities of ‘in-system’ access. Wide variations in the utilization of both primary and secondary care services are indicative of access inequalities, but these variations may sometimes reflect clinical uncertainty or poor-quality care. Access inequalities may also arise from personal, social, and cultural barriers experienced by patients in accessing healthcare. These barriers typically represent more severe obstacles for marginalized groups in the population. Promoting equity means ensuring that services are responsive and acceptable to all groups, including those with stigmatized conditions.

Inter-Relational Dynamics of Various HR Aspects in High Altitude Illness Attrition

2020 ◽  
pp. 114-132
Author(s):  
Ajeya Jha ◽  
Ajay Dheer ◽  
Vijay Kumar Mehta ◽  
Saibal Kumar Saha
Keyword(s):  
Decision Making ◽  
High Altitude ◽  
Poor Performance ◽  
Working Hours ◽  
Poor Quality ◽  
Relational Dynamics ◽  
Adverse Health Effects ◽  
Personal Stress ◽  
High Altitude Illness ◽  
And Performance

The adverse health effects of high altitude are of considerable importance since they may seriously interfere with working efficiency of an organization that is actively involved with inescapable duties. The objective of the current study is to explore inter-relational dynamics of various HR aspects in HAIA. The HR aspects included are job delay, poor team, motivation, less leave, high working hours, poor decision making, personal stress, family stress, personal discomfort, uncertainty, poor relations, health, accidents, quality and performance. A decision-making trial and an evaluation laboratory have been used to explore the inter-relation dynamics of various factors of HR. The results indicate that personal stress has the highest impact priority which is followed by poor performance, poor team and motivation. Uncertainty, less leave, and high working hours has the least impact priority. It is also found that high working hours, less leave and poor health are the major causes whereas decrease in motivation and poor quality of work are the major results.

A Structured Method for Security Requirements Elicitation concerning the Cloud Computing Domain

2014 ◽  
Vol 5 (2) ◽  
pp. 20-43 ◽  
Author(s):  
Kristian Beckers ◽  
Isabelle Côté ◽  
Ludger Goeke ◽  
Selim Güler ◽  
Maritta Heisel
Keyword(s):  
Cloud Computing ◽  
System Analysis ◽  
Economic Benefits ◽  
Cloud Services ◽  
Security Requirements ◽  
Cloud System ◽  
Security Requirement ◽  
Analysis Pattern ◽  
It Resources ◽  
Requirements Patterns

Cloud computing systems offer an attractive alternative to traditional IT-systems, because of economic benefits that arise from the cloud's scalable and flexible IT-resources. The benefits are of particular interest for SME's. The reason is that using Cloud Resources allows an SME to focus on its core business rather than on IT-resources. However, numerous concerns about the security of cloud computing services exist. Potential cloud customers have to be confident that the cloud services they acquire are secure for them to use. Therefore, they have to have a clear set of security requirements covering their security needs. Eliciting these requirements is a difficult task, because of the amount of stakeholders and technical components to consider in a cloud environment. Therefore, the authors propose a structured, pattern-based method supporting eliciting security requirements and selecting security measures. The method guides potential cloud customers to model the application of their business case in a cloud computing context using a pattern-based approach. Thus, a potential cloud customer can instantiate our so-called Cloud System Analysis Pattern. Then, the information of the instantiated pattern can be used to fill-out our textual security requirements patterns and individual defined security requirement patterns, as well. The presented method is tool-supported. Our tool supports the instantiation of the cloud system analysis pattern and automatically transfers the information from the instance to the security requirements patterns. In addition, they have validation conditions that check e.g., if a security requirement refers to at least one element in the cloud. The authors illustrate their method using an online-banking system as running example.

A Mathematical Model for the Pipeline Transportation of Soft Clay

2013 ◽  
Vol 275-277 ◽  
pp. 1476-1479 ◽  
Author(s):  
Wan Zhen Zhu ◽  
Shu Hui Wu ◽  
Song Lei Tao
Keyword(s):  
Mathematical Model ◽  
Flow Field ◽  
Soft Clay ◽  
Pipeline Transportation ◽  
Long Distance

We have found a way of a pipeline transportation of soft clay in order to overcome the difficulties to transport soft clay so that the long distance transportation of soft clay becomes true in Engineering. By analyzing the properties of soft clay and pipeline transportation, the rules of decreasing energy through the pipeline transportation, and the characters of flow field with gas, liquid and mud, we have obtained a mathematical model for the pipeline transportation of soft clay. The model not only builds up a theory for the non-continuous soft clay column pipeline transportation techniques but also leads to further developments and wider applications of the pipeline transportation of soft clay.

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