scholarly journals Exploring the impact of long-term evaporation on the relationship between capillary pressure and water saturation in unsaturated porous media

2020 ◽  
Vol 582 ◽  
pp. 124557
Author(s):  
Aderonke O. Adegbule ◽  
Tohren C.G. Kibbey
Keyword(s):  
Porous Media ◽  
Capillary Pressure ◽  
Water Saturation ◽  
Unsaturated Porous Media ◽  
The Impact ◽  
The Relationship

The impact of biofilm-forming potential and tafi production on transport of environmental Salmonella through unsaturated porous media

Biologia ◽  
2009 ◽  
Vol 64 (3) ◽  
Author(s):  
Anthony Salvucci ◽  
Wei Zhang ◽  
Veronica Morales ◽  
M. Cakmak ◽  
Anthony Hay ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Porous Media ◽  
Biofilm Formation ◽  
Microbial Pathogens ◽  
Unsaturated Porous Media ◽  
E Coli ◽  
Unsaturated Sand ◽  
Factors Influencing ◽  
The Impact ◽  
The Relationship

AbstractUnderstanding the factors influencing the transport of microbial pathogens, such as Salmonella and Escherichia coli, through porous media is critical to protecting drinking water supplies. The production of biofilms, along with individual biofilm-associated components, such as tafi, is believed to hinder transport of microorganisms through soil. This study investigated the relationship between biofilm formation and tafi production and the transport of environmental Salmonella through porous media. Thirty-two Salmonella isolates were initially assayed for their ability to form biofilms, from which a subset of these was selected to represent a range of high and low biofilm-formation potential and tafi formation capabilities. These were subsequently examined in unsaturated sand columns for transport characteristics. No obvious correlation was observed between Salmonella phenotypes and column retention. The results indicated that while transport of well-characterized laboratory E. coli strains can often be hindered by the presence of tafi and the potential to form biofilms, the presence of tafi did not retard the transport of the Salmonella strains.

Risk Attitude and Corporate Investment under Output Market Uncertainty: Evidence from The Mekong River Delta, Vietnam

2016 ◽  
pp. 59-70
Author(s):  
Ninh Le Khuong ◽  
Nghiem Le Tan ◽  
Tho Huynh Huu
Keyword(s):  
Negative Relationship ◽  
Risk Attitude ◽  
Business Strategies ◽  
Risk Averse ◽  
Market Uncertainty ◽  
Firm Investment ◽  
Output Market ◽  
The Impact ◽  
The Relationship

This paper aims to detect the impact of firm managers’ risk attitude on the relationship between the degree of output market uncertainty and firm investment. The findings show that there is a negative relationship between these two aspects for risk-averse managers while there is a positive relationship for risk-loving ones, since they have different utility functions. Based on the findings, this paper proposes recommendations for firm managers to take into account when making investment decisions and long-term business strategies as well.

scholarly journals Environmental Management, Green Innovation, and Social–Open Innovation

2021 ◽  
Vol 7 (1) ◽  
pp. 89
Author(s):  
Pham Thu Huong ◽  
Jacob Cherian ◽  
Nguyen Thi Hien ◽  
Muhammad Safdar Sial ◽  
Sarminah Samad ◽  
...  
Keyword(s):  
Environmental Management ◽  
Stock Exchange ◽  
Advanced Technology ◽  
Green Innovation ◽  
Social Image ◽  
Whole Process ◽  
Corporate Environmental Management ◽  
The Impact ◽  
The Relationship

The present study aims to determine the impact of green innovation (GI) on the overall performance of an organization while keeping the variable of environmental management (EM) as a moderator. We used a dataset consisting of four data years, from 2014 to 2017, of A-share companies listed on the Shanghai Stock Exchange (SSE). The concept of green innovation refers to the use of advancements in technology that enable savings in energy, along with the recycling of waste material. When advanced technology is utilized in the production process, the products are referred to as green products and the whole process of adopting such technologies and product design is referred to as “Corporate Environmental Management”. Such innovations improve the overall financial performance of companies as it enables them to improve their social image by reducing their carbon footprint and ensures their long-term sustainability. The main issue is the limited focus and attention given to the topic, from the perspective of companies. This research focuses on the impact of green innovation and the importance of environmental management for the sustainability of companies. Our findings suggest that the relationship between green innovation and the performance of the company is positive and verifies the existence of moderating effects of environmental management on the relationship between green innovation and firm performance. Implications are given to academia and practitioners.

ISSUES OF THE RELATIONSHIP BETWEEN THE STATE BUDGET AND ECONOMIC GROWTH IN UZBEKISTAN

2021 ◽  
Vol 4 (7) ◽  
pp. 4-19
Author(s):  
Akmal Baltayevich Allakuliev ◽  
Keyword(s):  
Economic Growth ◽  
The State ◽  
Rate Of Return ◽  
State Budget ◽  
Macroeconomic Shocks ◽  
Dynamic Correlations ◽  
Short And Long Term ◽  
The Impact ◽  
The Relationship

The article examines the interaction of the country's GDP with the state budget in the short and long term, the impact of the macro-fiscal mechanism on the country's economic growth on the example of Uzbekistan.The aim of the study is to identify dynamic correlations between the country's state budget expenditures and the economic growth of the macro-fiscal mechanism in the short and long term, as well as to analyze the approximation or rate of return of GDP and the state budget to equilibrium during various macroeconomic shocks. and hesitation.The scientific novelties of the research are:

The effect of green purchasing on purchasing performance: the moderating role played by long-term relationships and strategic integration

2016 ◽  
Vol 31 (2) ◽  
pp. 312-324 ◽  
Author(s):  
Javier González-Benito ◽  
Gustavo Lannelongue ◽  
Luis Miguel Ferreira ◽  
Carmen Gonzalez-Zapatero
Keyword(s):  
Design Methodology ◽  
Purchasing Management ◽  
Environmental Practices ◽  
Content Type ◽  
Strategic Integration ◽  
Green Purchasing ◽  
The Impact ◽  
The Relationship ◽  
Moderating Role

Purpose – The purpose of this paper is to analyse the relationship between the environmental management of purchases and firm performance. The authors examine the moderating role played by two variables: the establishment of long-term relationships with suppliers and the strategic integration of the purchasing function. Design/methodology/approach – The authors conduct an empirical study on a sample of 100 Portuguese firms. Findings – Evidence reveals that green purchasing management improves the performance of the purchasing function, although the impact is greater when the organisation forges lasting alliances with its suppliers. Originality/value – This paper contributes to the study of the consequences of introducing environmental practices into the purchasing function, especially with regards to the formation of a panel of sustainable suppliers. Specifically, this research provides evidence to show that the implementation of those practices has positive impacts on the operating performance of the purchasing function and that the said effect is greater when a firm establishes long-term relationships with its suppliers.

Abstract 5772: The Impact of Aortic Plaque Morphology on Survival Rate and the Incidence of Subsequent Embolic Event: Very Long-Term Follow-Up Data

Circulation ◽  
2008 ◽  
Vol 118 (suppl_18) ◽  
Author(s):  
Chisato Izumi ◽  
Shuichi Takahashi ◽  
Sumiyo Hashiwada ◽  
Koji Hanazawa ◽  
Jiro Sakamoto ◽  
...  
Keyword(s):  
Survival Rate ◽  
Event Rate ◽  
Plaque Morphology ◽  
Embolic Event ◽  
Aortic Plaque ◽  
Long Term Follow Up ◽  
The Impact ◽  
The Relationship

Atheromatous plaques of the aorta have been regarded as a potential source of emboli, but there are few reports about the frequency and prognosis of patients with thoracic aortic plaques and about the relationship between plaque morphology and prognosis, especially long-term follow-up data. The purpose of this study is to clarify the impact of aortic atheromatous plaque morphology on survival rate and the incidence of subsequent embolic event. We retrospectively investigated 1570 consecutive patients who underwent transesophageal echocardiography between 1991 and 2003. The presence of severe plaque (>5mm in thickness) in the thoracic aorta were examined. Survival rate and subsequent embolic event rate were compared between patients with severe plaque and 109 control patients. The control patients were selected from the patients who showed no or mild plaque and as they were matched for age, gender, and risk factors of atherosclerosis with the patients with severe aortic plaque. The relationship between aortic plaque morphology and prognosis was also estimated, according to the presence of ulceration, calcification, hypoechoic plaques, and mobile plaques. Mean follow-up period was 8.7 years. Among 1570 patients, severe aortic plaque was detected in 92 patients (5.9%). These 92 patients showed significantly low survival rate and high subsequent embolic event rate compared with control patients (8-year survival rate, 50% vs 87%, 8-year embolic event free rate, 57% vs 90%). The relative risk of death was significantly increased for ulceration (2.4, 95% CI;1.1–5.2) and the relative risk of embolic events was significantly increased for mobile plaques (2.2, 95% CI;1.1–5.1). In conclusion, aortic plaque > 5mm in thickness was a predictor of a low survival rate and a high embolic event rate. Among patients with aortic plaque >5mm in thickness, ulceration was a predictor of a low survival rate and mobile plaque was a predictor of a high embolic event rate.

scholarly journals Effects of Foam Microbubbles on Electrical Resistivity and Capillary Pressure of Partially Saturated Porous Media

Molecules ◽  
2020 ◽  
Vol 25 (15) ◽  
pp. 3385 ◽  
Author(s):  
Abdulrauf R. Adebayo ◽  
Abubakar Isah ◽  
Mohamed Mahmoud ◽  
Dhafer Al-Shehri
Keyword(s):  
Porous Media ◽  
Electrical Resistivity ◽  
Capillary Pressure ◽  
Oil Recovery ◽  
Water Saturation ◽  
Porous Plate ◽  
Fluid Distribution ◽  
Cross Sectional ◽  
Injection Process ◽  
Saturation Exponent

Laboratory measurements of capillary pressure (Pc) and the electrical resistivity index (RI) of reservoir rocks are used to calibrate well logging tools and to determine reservoir fluid distribution. Significant studies on the methods and factors affecting these measurements in rocks containing oil, gas, and water are adequately reported in the literature. However, with the advent of chemical enhanced oil recovery (EOR) methods, surfactants are mixed with injection fluids to generate foam to enhance the gas injection process. Foam is a complex and non-Newtonian fluid whose behavior in porous media is different from conventional reservoir fluids. As a result, the effect of foam on Pc and the reliability of using known rock models such as the Archie equation to fit experimental resistivity data in rocks containing foam are yet to be ascertained. In this study, we investigated the effect of foam on the behavior of both Pc and RI curves in sandstone and carbonate rocks using both porous plate and two-pole resistivity methods at ambient temperature. Our results consistently showed that for a given water saturation (Sw), the RI of a rock increases in the presence of foam than without foam. We found that, below a critical Sw, the resistivity of a rock containing foam continues to rise rapidly. We argue, based on knowledge of foam behavior in porous media, that this critical Sw represents the regime where the foam texture begins to become finer, and it is dependent on the properties of the rock and the foam. Nonetheless, the Archie model fits the experimental data of the rocks but with resulting saturation exponents that are higher than conventional gas–water rock systems. The degree of variation in the saturation exponents between the two fluid systems also depends on the rock and fluid properties. A theory is presented to explain this phenomenon. We also found that foam affects the saturation exponent in a similar way as oil-wet rocks in the sense that they decrease the cross-sectional area of water available in the pores for current flow. Foam appears to have competing and opposite effects caused by the presence of clay, micropores, and conducting minerals, which tend to lower the saturation exponent at low Sw. Finally, the Pc curve is consistently lower in foam than without foam for the same Sw.

scholarly journals Effect of Drought on Outbreaks of Major Forest Pests, Pine Caterpillars (Dendrolimus spp.), in Shandong Province, China

Forests ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 264 ◽  
Author(s):  
Yongbin Bao ◽  
Fei Wang ◽  
Siqin Tong ◽  
Li Na ◽  
Aru Han ◽  
...  
Keyword(s):  
Positive Impact ◽  
Shandong Province ◽  
Forest Damage ◽  
Decadal Scale ◽  
Effects Of Drought ◽  
Forestry Production ◽  
Ecological Reconstruction ◽  
The Impact ◽  
The Relationship

As the main defoliators of coniferous forests in Shandong Province, China, pine caterpillars (including Dendrolimus suffuscus suffuscus Lajonquiere, D. spectabilis Butler, and D. tabulaeformis Tsai et Liu) have caused substantial forest damage, adverse economic impacts, and losses of ecosystem resources. Therefore, elucidating the effects of drought on the outbreak of these pests is important for promoting forestry production and ecological reconstruction. Accordingly, the aim of the present study was to analyse the spatiotemporal variation of drought in Shandong Province, using the Standard Precipitation Index, and to investigate the impact of drought on the outbreak of pine caterpillar infestations. Future trends in drought and pine caterpillar populations were then estimated using the Hurst exponent. The results showed that: (1) Drought decreased gradually and showed a wetting trend from 1981 to 2012, with frequency decreasing on a decadal scale as follows: 1980s > 1990s > 2000s > 2010s; (2) The total area of pine caterpillar occurrence decreased strongly from 1992 to 2012; (3) Long-term or prolonged drought had a greater positive impact on pine caterpillar outbreak than short-term drought; (4) In the future, a greater portion of the province’s area will experience increased wetting conditions (57%) than increased drought (43%), and the area of pine caterpillar outbreak is estimated to decrease overall. These findings help elucidate the relationship between drought and pine caterpillar outbreak in Shandong Province and, hence, provide a basis for developing preventive measures and plans.

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