scholarly journals Investigation of Karst Spring Flow Cessation Using Grey System Models

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1927
Author(s):  
Yaru Guo ◽  
Tian-Chyi Jim Yeh ◽  
Yonghong Hao
Keyword(s):  
Anthropogenic Activities ◽  
Strong Relationship ◽  
Climate Variation ◽  
Grey System ◽  
System Models ◽  
Second Stage ◽  
Spring Flow ◽  
Set Up ◽  
One Year ◽  
Two Stages

Karst aquifers are prominent sources of water worldwide; they store large amounts of water and are known for their beautiful springs. However, extensive groundwater development and climate variation has resulted in a decline in the flow of most karst springs; some have even dried up. In order to obtain a better understanding of the factors contributing to this development, this study introduced grey system models, which quantified spring flow, taking Jinci Springs (China), which dried up in May 1994, as an example. Based on the characteristics of Jinci Springs, spring flow was divided into two stages: first (1954–1960), when the spring flow was affected only by climate variation; and second (1961–1994), when the flow was impacted by both climate variation and anthropogenic activities. The results showed that Jinci Springs flow had a strong relationship with precipitation occurring one year and three years earlier in the first stage. Subsequently, a grey system GM (1,3) model with one-year and three-year lags was set up for the first stage. By using the GM (1,3) model, we simulated the spring flow in the second stage under effects of climate variation only. By subtracting the observed spring flow from the simulated flow, we obtained the contribution of anthropogenic activities to Jinci Springs’ cessation. The contribution of anthropogenic activities and climate variation to the decline was 1.46 m3/s and 0.62 m3/s, respectively. Finally, each human activity that caused the decline was estimated. The methods devised herein can be used to describe karst hydrological processes that are under the effects of anthropogenic activities and climate variation.

scholarly journals Investigation of Karst Spring Flow Cessation Using Grey System Model

2019 ◽  
Author(s):  
Yaru Guo ◽  
Tian-Chyi Jim Yeh ◽  
Yonghong Hao
Keyword(s):  
Anthropogenic Activities ◽  
Climate Variation ◽  
Grey System ◽  
Large Area ◽  
Karst Springs ◽  
Second Stage ◽  
Spring Flow ◽  
Set Up ◽  
One Year ◽  
Two Stages

Globally karst aquifers store large amount of precious water and create beautiful karst springs in many places. However, most of the karst springs flow declined, and some of the karst springs dried up with the effects of extensive groundwater development and climate variation. For example, Jinci Springs (China) is known for the beautiful landscape it created and large area of paddy fields it irrigated. Unfortunately, it dried up in May 1994. For better understanding of the hydrological processes of karst springs, this study introduced grey system models to quantify spring flow taking Jinci Springs as an example. Based on the characteristics of Jinci Springs flow, the spring flow was divided into two stages: the first stage (1954-1960), when the spring flow was affected only by climate variation; and the second stage (1961-1994), when the flow was impacted by both climate variation and anthropogenic activities. Results showed that the Jinci Springs flow had strong relations with precipitation occurring one year and three years earlier in the first stage. Subsequently, a grey system GM (1, 3) model with one-year and three-year lags was set up for the first stage. By using the GM (1, 3) model, we simulated the spring flow in the second stage under effects of climate variation only. Subtracting the observed spring flow from the simulated flow, we obtained the contribution of anthropogenic activities to Jinci Springs cessation. The contribution of anthropogenic activities and climate variation to Jinci Springs cessation was 1.46m3/s and 0.62m3/s, respectively. Finally, each human activity causing spring flow decline was estimated.

scholarly journals Coverage of the Sprayed Objects in the Aspect of the Coefficient of the Spray Surfaces

2018 ◽  
Vol 66 (1) ◽  
pp. 9-16
Author(s):  
Beata Cieniawska ◽  
Deta Łuczycka ◽  
Jan Červinka ◽  
Katarzyna Dereń
Keyword(s):  
Significant Influence ◽  
Strong Relationship ◽  
Morphological Features ◽  
Spray Characteristics ◽  
Mutual Relation ◽  
Second Stage ◽  
Laboratory Conditions ◽  
Two Stages ◽  
Selection Of

The aim of the study was to compare the degree of coverage of the sprayed objects with the selected nozzles in the aspect of the characteristics of the sprayed object, determined by the coefficient of the position of the sprayed surfaces. Studies were conducted in two stages, in laboratory conditions, in which the first step was to determine the characteristics of the sprayed objects, and in the second there were conducted the studies of the degree of coverage. Based on the analysis of the obtained results from the first stage it was stated that the studied plants were characterised by great differentiation of morphological features having a significant influence on the parameters of their spray characteristics. Important was the fact that the use of the coefficient of the spray surfaces Wpo, determining the mutual relation of particular sprayed surfaces facilitates the selection of the most appropriate nozzles and treatment parameters in relation with the morphological features of the plant. In the second stage, concerning the studies of the degree of the coverage it was stated that the selected nozzles differed strongly in the degree of coverage of vertical and horizontal objects. Differentiated coverage for particular nozzles had a strong relationship with the coefficient of spray surfaces, except that the dual‑spray nozzles covered the vertical surfaces better compared to the single‑spray nozzles, which covered the horizontal surfaces better.

Searching sheet metal parts based on bending process similarity

2003 ◽  
Vol 217 (3) ◽  
pp. 427-438 ◽  
Author(s):  
D Misaki ◽  
S Aomura
Keyword(s):  
Sheet Metal ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Second Stage ◽  
Robot Gripper ◽  
Bending Process ◽  
Similar Part ◽  
Set Up ◽  
Two Stages ◽  
Flat Pattern

Sheet metal parts have been widely used in industry and much information for parts has been accumulated in a database. In planning the manufacturing process of a sheet metal part, if the process plan of a similar part can be retrieved from the database, the process planning would be faster and more consistent. In this paper, an effective method of searching the sheet metal parts based on bending process similarity is proposed. This method consists of two stages. In the first stage, flat pattern drawings of the parts with the same set-up numbers are classified into several topological structures. In the second stage, the parts that possess a similar bending process to the target part are selected. The bending process similarity is defined by the grasping position of a robot gripper. The number of reposition and grasping positions are decided by taking the geometric element of the flat pattern into consideration. The effectiveness of this method is described and illustrative examples are shown.

scholarly journals Ellipsometric Study of the Zinc Selenide Natural Cleaves Oxidation

2015 ◽  
Vol 16 (3) ◽  
pp. 481-486
Author(s):  
V. А. Оdarych
Keyword(s):  
Zinc Selenide ◽  
Optical Constants ◽  
Index Of Refraction ◽  
Atmospheric Conditions ◽  
External Layer ◽  
Second Stage ◽  
Transparent Layer ◽  
Ellipsometric Study ◽  
One Year ◽  
Two Stages

Measuring of ellipsometric parameters of the light reflected from the fresh cleaves surface of zinc selenide  are conducted under atmospheric conditions during one year. It has been found that the process of cleaves surface interaction with air consists of two stages. A layer with  thickness to 7 nm is formed on the first stage within  to 3 weeks. This layer optical constants  are a little less than zinc selenide optical constants. An external transparent layer with the index of refraction approximately 1,4 and thickness to 2,5 nm show itself on the second stage from one month of to year. Supposed, this external layer contains the mixture of an unstable oxides and air.

General Practitioners' Knowledge and Use of a Disabled Living Centre

1996 ◽  
Vol 59 (2) ◽  
pp. 79-83
Author(s):  
Anna V Phillips
Keyword(s):  
Monitoring System ◽  
General Practitioners ◽  
Telephone Interview ◽  
Response Rate ◽  
Postal Questionnaire ◽  
Professional Group ◽  
Second Stage ◽  
Set Up ◽  
Two Stages ◽  
To Receive

In March 1994, 141 Aberdeen general practitioners (GPs) were surveyed to clarify why Hillylands Disabled Living Centre (DLC) appeared to receive few direct referrals from this professional group. This was carried out in two stages. The first consisted of a postal questionnaire which received a 77% response rate. This identified that 90% of the 108 respondents knew of Hillylands' existence but only 24% were fully aware of the services it offered. Forty-six per cent had advised someone to visit Hillylands DLC, although only 17% of GPs had visited the centre themselves. The second stage, a telephone interview of 46 volunteer GPs, indicated that some GPs recognised a need to increase their awareness. Some felt that it was not appropriate that they visit Hillylands DLC, although those who had done so had found their visit useful. Recommendations are made to extend the mailing list at Hillylands and to set up a monitoring system to ensure regular liaison and supply of publicity material. It is also suggested that the feasibility of developing a comprehensive publicity initiative be investigated.

scholarly journals Specific heat-temperature curves of some age-hardening alloys

1938 ◽  
Vol 168 (933) ◽  
pp. 237-264 ◽  
Keyword(s):  
Low Temperatures ◽  
Lattice Parameter ◽  
Age Hardening ◽  
Second Stage ◽  
Large Numbers ◽  
Heat Treated ◽  
Or Groups ◽  
Set Up ◽  
Lower Temperature ◽  
Two Stages

In a recent paper Gayler (1937) has dealt with the various theories of age hardening and has put forward the view that ageing takes place in two stages: in the first stage the solute atoms diffuse to planes about which precipitation proper will ultimately take place, and this gives rise to an increase in resistance to deformation and an increase in electrical resistivity without change in lattice parameter. The second stage follows the first and takes place nearly simultaneously. Some of the diffusing atoms will form molecules gradually form groups which will tend to produce a gradual decrease in resistivity and a diminution in the rate of hardening. When the molecular groups have grown to such an extent that the parent solid solution can no longer withstand the stresses set up, release of these stresses is caused by rejection of the groups, i. e. precipitation proper takes place. Once precipitation has set in them, according to Gayler's view, softening should begin. This theory tends to combine the "Knot" theory (Gayler and Preston 1932), which states that age-hardening occurs due to the formation of clusters or groups of atoms inside the parent lattice (the first stage, according to Gayler), and the precipitation theory (Merica and other 1919) which attributed hardening to the presence of large numbers of precipitated particles, probably ultramicroscopic in size, dispersed throughout the material. Naturally the formation of clusters or knots will occur at a lower temperature than precipitation, so that at low temperatures hardening will occur by the mechanism of the first stage. At high temperatures hardening may take place due to precipitation, the first stage being masked entirely. The question as to which of the tow processes is likely to be more effective in any particular alloy when heat-treated to give the maximum hardness obtainable in the hardening range is not specifically dealt with by Gayler, although it is stated that the experimental evidence available suggests that the second stage is, in general, more important. The work of Cohen (1936) on the silver-copper alloy containing 7∙5 % copper supports this contention, since his results show that hardening due to knot formation even at low temperatures (100-150°C) is very small indeed.

scholarly journals A Analysis on Queuing System with Setup Time in Revamp Process

2019 ◽  
Vol 9 (1S4) ◽  
pp. 967-969
Keyword(s):  
Performance Measures ◽  
Generating Functions ◽  
Setup Time ◽  
Repair Process ◽  
The Other ◽  
Queuing Model ◽  
Second Stage ◽  
Time Stage ◽  
Set Up ◽  
Two Stages

In this paper, we study about a M/G/1 Queuing model with single stage of service. Service interrupts during the time of service. The server does not get into the repair process immediately. It gets into a Set up time stage for the prior work to be done. On completion of set up stage service, the server will get into the repair process consisting of two stages, in which first stage is compulsory and the second stage of service is optional. For the model defined, we get the steady state results in closed form in terms of the probability generating functions and all the other execution performance measures of the model defined.

scholarly journals Policies for Improving PM2.5 Particles and GHGs Emissions in a Maritime Port of Taiwan: Evidence Based on the INDC and GGRMA Regulations

2021 ◽  
Vol 9 (12) ◽  
pp. 1315
Author(s):  
Ching-Chih Chang ◽  
Yi-An Tsai
Keyword(s):  
Pollution Reduction ◽  
Evidence Based ◽  
Second Stage ◽  
Reduce Emissions ◽  
Set Up ◽  
Liquid Natural Gas ◽  
Two Stages ◽  
The Impact ◽  
Policy Proposals ◽  
Port Of Kaohsiung

The impact of possible emission reduction policies designed to reduce port emissions in the Port of Kaohsiung in Taiwan was analyzed, focusing on ways to reduce air pollution from CO2, CH4, N2O, PM10, PM2.5, NOx, and SOx generated by vessels, cranes, and truck tractors in the port. This paper was set up in two stages to determine how pollution reduction policies could reach the 2030 and in 2050 goals. The results showed that emissions of CO2, CH4, N2O, PM10, PM2.5, NOx, and SOx could be reduced by 46%, 26%, 25%, 77%, 77%, 76%, and 68%, respectively, in the first stage (in 2030, INDC), and by 57%, 59%, 53%, 79%, 79%, 80%, and 69%, respectively, in the second stage (in 2050, GGGRMA), as compared to 2005 data. This paper concludes as follows: (1) for vessels, the use of liquid natural gas is the best way to reduce GHGs when navigating by water; (2) for bridge cranes, electrification is the better policy during operation; (3) in the case of truck tractors, the generation of battery-electric power is the best way to reduce emissions. These policy proposals for improving air quality can be applied to all ports in Taiwan.

scholarly journals Does the height to entrepreneurship nexus have two stages? New evidence from 27 nations

2021 ◽  
Author(s):  
Nazim Habibov ◽  
Alena Auchynnikava ◽  
Rong Luo
Keyword(s):  
University Education ◽  
Percentage Point Increase ◽  
Second Stage ◽  
Point Increase ◽  
Stage Process ◽  
Main Determinants ◽  
Set Up ◽  
Two Stages ◽  
New Evidence ◽  
The Relationship

AbstractWe examine the association between height and entrepreneurship in 27 nations, finding that the relationship between height and entrepreneurship can be considered to be a two-stage process. During the first stage, individuals make the decision of whether or not to try to set up their own business. At this stage, the effect of height is stronger: each 10-cm increase in height is associated with an approximately 1.4 percentage point increase in the probability of having tried to set up a business. During the second stage, after a positive decision to embark upon entrepreneurship has already been taken, people may find success in setting up their business. At this stage, although taller individuals are still more likely to experience success than their shorter counterparts, the effect of height becomes much weaker. Each 10-cm increase in height is associated with an approximately 0.4 percentage point increase in the probability of having tried to set up a business without success, and an approximately 0.4 percentage point increase in the likelihood of having set up a business in which the respondent is no longer involved, or that is no longer operational. Finally, each 10-cm increase in height is associated with an approximately 1 percentage point increase in the probability of remaining an entrepreneur. At the same time, we found that the effect of height is stronger in magnitude than the effects of gender, health and university education. This finding is remarkable insofar as gender, health and university education are usually considered to be the main determinants of entrepreneurship.

Altered Fine Structure of B Lymphocytes Correlated with Defective Terminal Differentiation

1973 ◽  
Vol 31 ◽  
pp. 386-387
Author(s):  
Dale E. Bockman ◽  
L. Y. Frank Wu ◽  
Alexander R. Lawton ◽  
Max D. Cooper
Keyword(s):  
Immune Deficiency ◽  
B Lymphocytes ◽  
Plasma Cells ◽  
Present Report ◽  
Specific Antigen ◽  
Terminal Differentiation ◽  
Second Stage ◽  
Two Stages ◽  
Deficiency Diseases ◽  
Cell Line Generation

B-lymphocytes normally synthesize small amounts of immunoglobulin, some of which is incorporated into the cell membrane where it serves as receptor of antigen. These cells, on contact with specific antigen, proliferate and differentiate to plasma cells which synthesize and secrete large quantities of immunoglobulin. The two stages of differentiation of this cell line (generation of B-lymphocytes and antigen-driven maturation to plasma cells) are clearly separable during ontogeny and in some immune deficiency diseases. The present report describes morphologic aberrations of B-lymphocytes in two diseases in which second stage differentiation is defective.

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