Effect of fiber modification with carboxymethyl cellulose on the efficiency of a microparticle flocculation system

2011 ◽  
Vol 65 (1) ◽  
Author(s):  
Sedat Ondaral ◽  
Orçuun Kurtuluş ◽  
Mustafa Usta
Keyword(s):  
Carboxymethyl Cellulose ◽  
Fiber Surface ◽  
Mass Ratio ◽  
Negative Effects ◽  
Precipitated Calcium Carbonate ◽  
Fiber Modification ◽  
Positive Effects ◽  
Drainage Time ◽  
Maximum Value ◽  
Negative Effect

AbstractCarboxymethyl cellulose (CMC) has been used widely to enhance dry strength of paper and uniformity of sheet in the papermaking industry. Besides these positive effects, it may affect the fines retention and dewatering processes negatively. These negative effects are mainly seen when fiber modifications with high CMC dosages are studied in laboratory scale. In this paper, the effect of fiber modification with CMC on the deposition of precipitated calcium carbonate (PCC) and on the dewatering process in the presence of cationic polyacrylamide (CPAM)/bentonite microparticle flocculation system is examined. It was determined that fiber modification with 10 mg g−1 of CMC decreased PCC deposition at the initial addition of CPAM and gave better PCC deposition at 2 mg g−1 of CPAM. It was also observed that PCC deposition on unmodified fibers is higher at lower CPAM concentration. PCC deposition was found as almost stable after a maximum value obtained at 0.5 mg g−1 of bentonite concentration for fiber modified with 40 mg g−1 of CMC. This indicates that interaction between CPAM and bentonite particles changed due to higher surface charge and CMC conformation on fibers. Results of the dewatering experiments showed that CMC modification increased the drainage time due to a denser and more plugged sheet. This negative effect was compensated with higher concentrations of CPAM and bentonite. On the other hand, dewatering is also affected by the mass ratio of CMC and CPAM, which was not the optimum one in this study at lower of CPAM. Thus, the increase in the drainage time in the presence of CMC on the fiber surface could be also caused by incorrect ratios of chemicals because the effect of CMC on the drainage time was not observed at higher concentrations of CPAM.

scholarly journals Customer Value Co-Creation Intention, Practices and Experience in Self-Service Technologies

2021 ◽  
pp. 12-26
Author(s):  
Badra Sandamali Galdolage
Keyword(s):  
Customer Value ◽  
Service Providers ◽  
Service Encounters ◽  
Emotional Experiences ◽  
Negative Effects ◽  
Positive Effects ◽  
Negative Effect ◽  
Physical Interfaces ◽  
Self Service ◽  
Self Service Technology

Many service encounters are moving from traditional physical interfaces to technologically incorporated self-service options. However, it is surprising that very limited extant literature is devoted to understanding the movement towards self-service technologies. Therefore, this study aims at understanding customer value co-creation intention, practices including both the value co-creation and co-destruction and their co-creation experiences in self-service technology context. Based on the positivistic approach, a quantitative study carried out distributing self-administered questionnaires to 600 individuals chosen based on a non-probabilistic convenience sampling method. Study found that customer value co-creation intention has significant positive effects on customer value co-creation practices and significant negative effects on customer value co-destruction in SSTs. Value co-creation practices show a strong positive effect on customer functional experiences and ‘positive emotional experiences’ while having a negative effect on ‘negative emotional experiences. In contrast, co-destruction shows inverse relationships. This study assists practitioners to understand why customers collaborate with SSTs, what they do in co-creating value and how this links with their experience. Service providers can use this understanding to facilitate customer co-creation by securing positive customer experiences and achieving competitive advantage by designing and delivering value enhancing self-service technological interfaces from both strategic and operational perspectives.

Sanctuary Cities, Crime, and Incorporation

2019 ◽  
pp. 118-152
Author(s):  
Loren Collingwood ◽  
Benjamin Gonzalez O’Brien
Keyword(s):  
Voter Turnout ◽  
Crime Rates ◽  
Police Force ◽  
Crime Reporting ◽  
Immigrant Communities ◽  
Negative Effects ◽  
Positive Effects ◽  
Chief Complaints ◽  
Negative Effect

One of the chief complaints raised against sanctuary cities is that they can increase crime, while one argument in their favor is that they can increase the incorporation of Latino and immigrant communities. This chapter analyzes both the positive and negative effects of sanctuary polices, finding that these policies have no effect on crime rates when comparable cities are compared to one another and when crime rates pre/post sanctuary are examined. The findings show that sanctuary policies can have positive effects, potentially increasing both Latino voter turnout and police force representation. While sanctuary policies are found to have few downsides and potential positive benefits, antisanctuary legislation like Texas’s SB4 are found to have a negative effect. In high-immigrant areas, antisanctuary legislation is found to depress the number of 911 calls, suggesting that antisanctuary legislation does in fact reduce crime reporting, as opponents claim.

scholarly journals The Effects of Online Teaching on EFL Students’ Learning Motivation

2020 ◽  
Vol 4 (11) ◽  
Author(s):  
Yinying Xu
Keyword(s):  
Online Teaching ◽  
Structured Interview ◽  
Study Data ◽  
Learning Motivation ◽  
Multiple Sources ◽  
Negative Effects ◽  
Learning Group ◽  
Positive Effects ◽  
Negative Effect ◽  
Efl Students

This study investigates the positive and negative effects of online teaching on EFL students’ learning motivation. There are 26 English majors in a Chinese university participant in this study. Data were collected from multiple sources: semi-structured interview and direct observation. The result shows that in the course aspect, it has a positive effect. In the teacher aspect, it has both negative and positive effects. But in the learning group aspect, it has a negative effect, because of losing of students’ interaction.

scholarly journals Does Usage of Online Social Media Help Users With Depressed Symptoms Improve Their Mental Health? Empirical Evidence From an Online Depression Community

2021 ◽  
Vol 8 ◽  
Author(s):  
Yingjie Lu ◽  
Taotao Pan ◽  
Jingfang Liu ◽  
Jun Wu
Keyword(s):  
Online Community ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Negative Effects ◽  
Positive Effects ◽  
Shared Identity ◽  
Online Social Media ◽  
Negative Effect ◽  
Practical Implications ◽  
Depressed Symptoms

Online depression communities offer people with depressed symptoms new opportunities to obtain health information and provide social support for each other to fight against the depression. We sought to investigate whether usage of online community help improve depression outcomes and determine which types of usage behaviors have positive or negative effects on depression. We proposed that two dimensions of the sense of belonging (sense of identity and trust) and three dimensions of the sense of support (informational, emotional, and socializing) have significant effects on depression, and further considered gender difference and its effect on depression. We obtained a dataset consisting of 465,337 posts from 244 members from a popular online depression community to test all 10 proposed hypotheses. The results reveal that (i) the sense of shared identity, trust, informational support, and emotional support have positive effects on depression, while socializing support have negative effects on depression, and (ii) the sense of shared identity and trust have more positive effects on depression for female users than male users while socializing support has a more negative effect on depression for female users than for male users. The findings have important practical implications for designers and managers of online depression communities.

scholarly journals THE EFFECTS OF SOCIAL MEDIA ON THE MORALITY OF MUSLIM YOUTHS IN NIGERIA

2020 ◽  
Vol 7 (7) ◽  
pp. 10-20
Author(s):  
Folami, Ahmadu Bolanle,
Keyword(s):  
Social Media ◽  
Quantitative Data ◽  
Media Violence ◽  
Negative Effects ◽  
Qualitative And Quantitative ◽  
Positive Effects ◽  
Meaningful Information ◽  
Quantitative Data Analysis ◽  
Negative Effect ◽  
The Media

The study aims at shedding light on the positive and negative effects of social media on the lives of Muslim youths’ in Nigeria. although, it is an avenue to reach out to people, gather and spread information to one another in the Muslim domain. However, the youths have also lost their dignity through it, because it is another avenue for fraudulent activities. The work examines the effects of both electronic and print media on the socio-religious spheres of Muslim youths. The ability to use the media for “ networking” has played a significant role in the lives of these youths. As technology continues to evolve, including the means to connect and communicate in cyberspace, young Muslims see it as an opportunity for them to be heard. The researcher employed the use of qualitative and quantitative data analysis in carrying out this study as well as conducting structural interviews inorder to elicit useful information. The research finally suggests that, despite the positive effects of social media on Muslim youths’ through Facebook, Twitter, Instagram WhatsApp, e.t.c in passing meaningful information across the board its negative effect of promoting moral decadence like character assassination, media violence, nudity, obscene movies and videos that have challenged the moral values of a practicing Muslim were not to be overlooked.

The Macroeconomic Determinants of House Prices and Rents

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jakob Shida
Keyword(s):  
Interest Rates ◽  
Housing Stock ◽  
House Prices ◽  
Bank Lending ◽  
Negative Effects ◽  
Positive Effects ◽  
Negative Effect ◽  
Per Capita ◽  
Pricing Power ◽  
Macroeconomic Determinants

Abstract Based on panel error correction models for a sample of up to 21 countries, this paper analyses the macroeconomic determinants of house prices and rents. In accordance with the existing literature, I find significantly positive effects of per capita income and bank lending on house prices, whereas the housing stock per capita and interest rates have negative effects. For rents, the results are somewhat more remarkable, indicating that both the housing stock and interest rates have a negative effect. While contradicting conventional economic theory, the latter finding might be explained by real estate investors exploiting their pricing power with varying degree depending on the level of real interest rates. Moreover, the estimated impact of interest rates on both house prices and rents varies with structural housing market characteristics. For instance, while interest rates have a more pronounced effect on house prices in countries with more developed mortgage markets, the same does not hold for the effect of interest rates on rents.

Positive and negative effects of allochthonous dissolved organic matter and inorganic nutrients on phytoplankton growth

2002 ◽  
Vol 59 (1) ◽  
pp. 85-95 ◽  
Author(s):  
Jennifer L Klug
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Phytoplankton Community ◽  
Phytoplankton Growth ◽  
Inorganic Nutrients ◽  
Physiological Status ◽  
Negative Effects ◽  
Positive Effects ◽  
Negative Effect ◽  
Positive Effect

Dissolved organic matter (DOM) can have both positive and negative effects on phytoplankton growth. The magnitude of these effects may vary depending on the source of DOM and the composition of the phytoplankton community. Here, I address the relative importance of the positive and negative effects of DOM extracts on phytoplankton growth. In short-term experiments with phytoplankton from West Long Lake, a small, moderately coloured lake in northern Michigan, U.S.A., the net effect of doubling ambient DOM on phytoplankton growth was positive. Increasing DOM concentrations from ~10 mg C·L–1 to ~20 mg C·L–1 had a negative effect on total phytoplankton growth by reducing irradiance and thus reducing the depth to which growth was positive. However, inorganic nutrients in the DOM extracts increased growth at each irradiance level. The positive effect on phytoplankton growth owing to the nutrients associated with DOM was greater than the negative effect caused by shading. Although the positive effects of allochthonous DOM inputs outweighed the negative effects for the nutrient-limited phytoplankton in these experiments, the net effect depends on the concentration and availability of nutrients associated with allochthonous DOM as well as the physiological status of the phytoplankton community.

scholarly journals Machiavellianism dimensions, religiosity, social environment, and tax evasion

2021 ◽  
Vol 24 (1) ◽  
pp. 1-26
Author(s):  
Jean Stevany Matitaputty ◽  
Priyo Hari Adi
Keyword(s):  
Social Environment ◽  
Tax Evasion ◽  
Online Survey ◽  
Sampling Method ◽  
Sampling Technique ◽  
Snowball Sampling ◽  
Negative Effects ◽  
Positive Effects ◽  
Negative Effect ◽  
Positive Effect

This research aims to investigate the effects of Machiavellianism dimensions that consist of the use of manipulative tactics, cynical views, and disregard of conventional morality on tax evasion. Further, we also analyze the effects of religiosity and social environment as the variables that control Machiavellianism behavior. The population in this research are individual taxpayers, and the sampling technique used is an online survey with the snowball sampling method. The criteria used in sampling are taxpayers who are self-employed or entrepreneurs.  The data is then analyzed using the univariate and multivariate General Linear Model (GLM) methods. The results show that manipulative tactics and disregard of conventional morality have positive effects on tax evasion. Meanwhile, cynical views have a negative effect on tax evasion. Further, religiosity has negative effects on the use of manipulative tactics and disregard of conventional morality. Lastly, social environment has a positive effect on cynical views but no significant effects on the use of manipulative tactics and disregard of conventional morality.

Long-term effects of lime on pasture yields and response to phosphate fertilizers on eight acidic soils

1994 ◽  
Vol 45 (5) ◽  
pp. 1051 ◽  
Author(s):  
ICR Holford ◽  
GJ Crocker
Keyword(s):  
Residual Effects ◽  
First Year ◽  
Long Term Effects ◽  
Negative Effects ◽  
Acidic Soils ◽  
Soil P ◽  
Beneficial Effects ◽  
Positive Effects ◽  
Negative Effect ◽  
Yield Responses

Eight experiments on acidic soils of the Northern Tablelands of New South Wales were carried out to measure lime effects on clover-based pastures and their response to fertilizer phosphate (P). Each experiment lasted 3 years. The seven soils deficient in P all responded to lime in the first year, and pasture yield responses were associated with lime-induced increases in isotopically exchangeable or soluble soil P or both. Three of these soils were also relatively high in soluble aluminium (Al) or manganese (Mn), and the lime-induced suppression of these toxic cations probably also contributed to the beneficial effects of lime. Negative effects of lime on fertilizer P response were more frequent than positive effects, and tended to occur on higher A1 soils. Lime eliminated the need for fertilizer P on at least three P-deficient soils during the 3 year period of the experiments, and this was also associated with increases in availability and uptake of soil P. Lime suppressed P sorptivity in all soils, but this caused an increase in fertilizer P effectiveness in only two soils (in the first year). Hence, the positive effect of lime on soluble soil P, which occurred on all soils and which would tend to lower fertilizer P effectiveness, seemed to be dominant over its negative effect on soil P sorptivity. Residual effects of lime and fertilizer P were similar, both declining after the first year, with five soils still responsive in the third year.

scholarly journals Fostering Team Creativity Through Team-Focused Inclusion: The Role of Leader Harvesting the Benefits of Diversity and Cultivating Value-In-Diversity Beliefs

2021 ◽  
pp. 105960112110096 ◽  
Author(s):  
Hannes Leroy ◽  
Claudia Buengeler ◽  
Marlies Veestraeten ◽  
Meir Shemla ◽  
Inga J. Hoever
Keyword(s):  
Leader Behaviors ◽  
Negative Effects ◽  
Inclusive Leadership ◽  
Team Creativity ◽  
Positive Effects ◽  
Negative Effect ◽  
Organization Study ◽  
Shed Light

This article advances prior theory on inclusive leadership to better understand how leaders foster team creativity through members’ experience that their uniqueness belongs within the team (i.e., team-derived inclusion). We argue that leaders can instigate such sense of inclusion in their team by engaging in two behaviors: stimulating all members of the team to fully express their unique viewpoints and perspectives ( harvesting the benefits of diversity) and facilitating beliefs about the value of differences in the team ( cultivating value-in-diversity beliefs). In Study 1 ( n = 491 employees), we validated newly developed scales measuring these two leader behaviors. Using a sample of 38 teams within one organization (Study 2), we showed that harvesting the benefits of diversity, without also cultivating value-in-diversity beliefs, has a negative effect on team-derived inclusion and indirectly team creativity. In Study 3, we demonstrated based on 93 teams from multiple organizations, while ruling out several alternative explanations, that harvesting the benefits of diversity positively relates to team-derived inclusion and indirectly team creativity, if leaders also cultivated value-in-diversity beliefs. Our model and findings across studies are the first to shed light on inclusive leadership as double-edged sword in that leaders may need to complement harvesting with cultivating to prevent negative effects and elicit positive effects on inclusion and, eventually, team creativity.

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