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Tytuł:
Depression effect of corn starch on muscovite mica at different pH values
Autorzy:
Peng, W.
Zhang, L.
Qiu, Y.
Song, S.
Powiązania:
https://bibliotekanauki.pl/articles/110573.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
muscovite mica
corn starch
pulp pH
depression effect
Opis:
The depression effect of corn starch on the surface of muscovite mica powder at different pulp pH value was investigated. The experiments were performed on single mineral, and its flotation performance was studied by flotation tests, adsorption quantity measurement, zeta-potential technique and Fourier transform infrared (FT-IR). The results indicated that the depression effect was varied with the pulp pH value when dodecylamine chloride (DDA) was used as collector, the strongest inhibitory effect appeared at pH 2 and the zeta-potential of muscovite mica increased overall after conditioned with corn starch solution. It was confirmed by the FT-IR spectra that the corn starch indeed adsorbed on the surface of muscovite mica powder and physical adsorption was occurred between muscovite mica and corn starch. This study leads to a better understanding of the depression effect of corn starch on the surface of muscovite mica powder.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 780-788
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The selective depression effect of sodium hexametaphosphate on the separation of chlorite and specularite
Autorzy:
Zhao, Fugang
Yu, Xiankun
Gao, Xiangpeng
Li, Mingyang
Chen, Xiangxiang
Powiązania:
https://bibliotekanauki.pl/articles/24085963.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
depressant
chlorite
specularite
adsorption
Opis:
Flotation is the most known beneficiation method for the separation of complex and refractory iron ores. As a typical iron-containing silicates, it is difficult to separate chlorite from specularite, because of the similar surface physicochemical properties. In this study, the selective depression effect of sodium hexametaphosphate (SHMP) was conducted via the cationic micro-flotation. The surface adsorption mechanism between SHMP and the two mineral surface was explored through surface adsorption amount tests, Zeta-potential measurements, Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses. The micro-flotation results indicated that SHMP could selectively depress around 90% of chlorite, while its effect on the floatability of specularite was negligible (<20% depressing). The surface adsorption amount tests, Zeta-potential measurements analysis demonstrated that SHMP selectively adsorb on chlorite surface while on the surface of specularite is feeble. The further surface adsorption analysis via FT-IR and XPS proved that SHMP selective adsorption occurred on the chlorite surface mainly by chemisorption mainly through the chelation reaction between O in the phosphate groups of SHMP molecular and metal ions on surface of chlorite.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 166495
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of the depression effect of two thiol depressants on the separation of specularite and aegirite
Autorzy:
Li, Mingyang
Zhang, Chen
Gao, Xiangpeng
Xie, Xian
Tong, Xiong
Powiązania:
https://bibliotekanauki.pl/articles/2175426.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
aegirite
specularite
flotation
depressant
iron-bearing silicate
Opis:
In this work, two thiol-type reagents, thioglycolic acid (TGA) and mercaptopropionic acid (MPA), were firstly exploited and compared as aegirite depressants with sodium oleate (NaOl) as the collector to separate specularite from aegirite by flotation. The adsorption performances and mechanisms of TGA and MPA on aegirite surface were investigated via flotation experiments, Zeta potential tests, adsorption measurements, contact angle dimensions, and surface characterizations. The results of flotation indicated that TGA and MPA exhibited a considerable depression impact on the flotation of aegirite but little effect on specularite. TGA depicted more excellent depression performance than MPA, which was confirmed by HLB calculation. The results demonstrated that TGA and MPA favorably adsorbed on aegirite surface instead of specularite, hindering the subsequent adsorption of NaOl on specularite and resulting in the surface being hydrophilic. XPS results revealed that TGA and MPA were significantly adsorbed on the surface of aegirite through an interaction between the carboxyl and thiol groups of the depressants and the Si and Fe on the surface of aegirite.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 152164
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Insights into the depression effect and adsorption mechanism of HACC on chalcopyrite surface in Cu-Mo flotation separation
Autorzy:
Li, Mingyang
Zhang, Pengpeng
Xiangpeng, Gao
Huang, Lingyun
Powiązania:
https://bibliotekanauki.pl/articles/27323662.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chalcopyrite
molybdenite
flotation
adsorption
depressant
Opis:
In this study, hydroxypropyltrimethyl ammonium chloride chitosan (HACC) was first introduced as a depressant during separating chalcopyrite from molybdenite (Cu-Mo). The selective effects of HACC on the separation of Cu-Mo were conducted by single-mineral flotation experiments. The findings from this study revealed that HACC helped separate Cu and Mo efficiently at pH 6 with 8 mg/dm3 of HACC, resulting in 76.22% and 5.38% of Mo and Cu flotation recovery, respectively. The adsorption mechanism of HACC was investigated via zeta potential, adsorption density, and contact angle measurement along with FT-IR and XPS analyses. The contact angle and adsorption density measurements offer indisputable proof that HACC can adsorb on the surface of chalcopyrite. Furthermore, FT-IR and XPS analyses confirm that N atoms in quaternary ammonium groups of HACC interact with Cu sites on the surface of chalcopyrite. The findings also suggest that HACC adsorbs on the surface without significantly impacting molybdenite. All these results confirm that HACC can be an effective chalcopyrite depressant.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 172481
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occupational burnout and its overlapping effect with depression and anxiety
Autorzy:
Golonka, Krystyna
Mojsa-Kaja, Justyna
Blukacz, Mateusz
Gawłowska, Magda
Marek, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/2162001.pdf
Data publikacji:
2019-04-03
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
depression
anxiety
burnout
neuroticism
MBI-GS
LBQ
Opis:
Objectives The problem of defining burnout concerns its overlapping effect with other syndromes and disorders, such as depression and anxiety. Additionally, some individual characteristics influence susceptibility to burnout (e.g., neuroticism). Therefore, the question arises whether burnout is or is not a distinct syndrome. The aim of the study is to compare 2 distinct burnout measures by analyzing their connections with organizational and individual variables. Material and methods The study was conducted in the Institute of Applied Psychology at the Jagiellonian University, Kraków, Poland on a group of employees (N = 100; 40 men; mean age 36.03 years). All participants completed 2 burnout scales: the Maslach Burnout Inventory – General Survey (MBI-GS) and the Link Burnout Questionnaire (LBQ). Organizational and individual factors were controlled with Areas of Worklife Survey, State-Trait Anxiety Inventory, NEO Five-Factor Inventory and Beck’s Depression Inventory scales. A structural equation path model was created to quantify the relations between organizational factors and burnout, as well as to control the individual factors of anxiety, neuroticism and depression. Results The results indicate high compatibility between MBI-GS and LBQ on burnout diagnosis. The MBI-GS and LBQ revealed stronger connections with organizational context and individual characteristics, respectively. Depression explains dimensions of exhaustion (MBI-GS, LBQ), sense of disillusion (LBQ), neuroticism–exhaustion (MBI-GS); anxiety explains sense of professional inefficacy (LBQ). Conclusions Besides organizational variables, individual characteristics also play an important role in explaining burnout syndrome. Exploring the 2 burnout models has revealed that depression is an important determinant of exhaustion. Cynicism and relationship deterioration have consistently been explained only by organizational context. Int J Occup Med Environ Health. 2019;32(2):229–44
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2019, 32, 2; 229-244
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of depression on quality of life of patients with multiple sclerosis
Wpływ depresji na jakość życia chorych ze stwardnieniem rozsianym
Autorzy:
Brola, Waldemar
Fudala, Małgorzata
Czernicki, Jan
Powiązania:
https://bibliotekanauki.pl/articles/1938539.pdf
Data publikacji:
2007
Wydawca:
Akademia Wychowania Fizycznego im. Bronisława Czecha w Krakowie
Tematy:
Multiple Sclerosis
Depression
Quality of Life
disability
stwardnienie rozsiane
depresja
niepełnosprawnosc
jakość życia
Opis:
Background and purpose: Depression is a common complication of multiple sclerosis. It can essentially affect the natural course of the disease, treatment and rehabilitation results and can significantly decrease the quality of life. The aim of this study is to assess the effect of depression on multiple sclerosis patients’ quality of life using the Polish version of the Functional Assessment of Multiple Sclerosis questionnaire (FAMS).Material and methods: Ninety-four patients aged 18–51 years, treated as inpatients at a neurological department, were examined. Depression was diagnosed using the DSM-IV criteria. Depression was assessed by means of the Hamilton Depression Rating Scale (HDRS). The influence of depression on the quality of life assessed with Functional Assessment of Multiple Sclerosis questionnaire (FAMS) and its association with locomotor insufficiency were analyzed (EDSS-Kurtzky Scale). The Fischer exact test and the Mann-Whitney test were used for statistical analysis.Results: Fifty-eight patients (62%) suffered from depression. Among them, 48 patients (51%) suffered mild depression and 10 patients (11%) had moderate or severe depression. A significantly better quality of life was noted in patients without depression in comparison to patients with mild and, especially, to those with moderate or severe depression (p < 0.005). A clear association between the degree of locomotor insufficiency, depression severity, and quality of life of patients with multiple sclerosis was found.Conclusions: High incidence of depression and its severity are associated with locomotor insufficiency. Depression significantly affects multiple sclerosis patients’ quality of life. The Polish version of FAMS questionnaire is a reliable and sensitive tool assessing quality of life and should be widely used in clinical practice.
Źródło:
Medical Rehabilitation; 2007, 11(2); 9-13
1427-9622
1896-3250
Pojawia się w:
Medical Rehabilitation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ nawożenia na skład runi i plonowanie łąki na glebie torfowo-murszowej w warunkach leja depresji wody gruntowej
Effect of fertilization on sward composition and yield of post-bog meadow under the conditions of ground water depression cone
Autorzy:
Miatkowski, Z.
Turbiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/951879.pdf
Data publikacji:
2016
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
gleba torfowo-murszowa
lej depresji
plon
roślinność łąkowa
depression cone
meadow plants
peat-muck soil
yield
Opis:
Celem badań było określenie wpływu nawożenia na skład botaniczny oraz plonowanie łąki w warunkach leja depresji wody gruntowej. Udział gatunków roślin określano metodą Klappa, przed zbiorem pierwszego pokosu. Badania prowadzono w latach 2005˗2014 na trzech kompleksach zlokalizowanych w siedliskach o zróżnicowanych warunkach wodnych. Pierwszy z kompleksów łąkowych był położony poza zasięgiem, drugi – na granicy, a trzeci w zasięgu leja depresji wody gruntowej. Stwierdzono korzystny wpływ nawożenia mineralnego na zwiększenie udziału traw w runi oraz zmniejszenie udziału roślin z grupy ziół i chwastów na kompleksach zasilanych wodą gruntową. Nawożenie mineralne powodowało zmniejszenie udziału roślin bobowatych. Stwierdzono także, że głębokie obniżenie poziomu wody gruntowej w siedliskach pobagiennych spowodowało drastyczne ograniczenie plonu roślin. Na kompleksie pozbawionym zasilania gruntowego średnie plony siana na poletkach nienawożonych i nawożonych wynosiły odpowiednio 0,40 i 0,85 Mg•ha-1 i były około 10-krotnie mniejsze niż na kompleksach zasilanych wodą gruntową.
The aim of the studies was to determine the effect of mineral fertilization on botanical composition, and meadows yields depending on water conditions. The studies were carried out in the years 2005–2014 at three sites located in habitats with different water conditions. The first of the sites was located out of the reach, the second – on the boundary and the third within the ground water depression cone. A favourable effect of mineral fertilization on increasing grasses share and decreasing herbs and weeds share in the sward at sites supplied with ground water was found. Mineral fertilization caused decrease in papilionaceous plants share. It was also found that deep lowering of ground water level at post-bog sites caused drastic reduction in plant yield. At the site without ground supply mean hay yield in plots without fertilization and with fertilization was 0.40 and 0.85 Mg·ha–1 respectively and was about 10 times lower than at sites supplied with ground water.
Źródło:
Woda-Środowisko-Obszary Wiejskie; 2016, 16, 1; 39-53
1642-8145
Pojawia się w:
Woda-Środowisko-Obszary Wiejskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Cognitive-behavioral Treatment on Depression Symptoms and Adaptability of the Students with Abnormal Grief
Autorzy:
Taghva, Fateme
Powiązania:
https://bibliotekanauki.pl/articles/1192696.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Abnormal Grief
Cognitive-Behavioral Treatment
Depression
Adaptability
Teenagers
Opis:
Death of an important person is one of the main events in the children’s life which children or teenagers may experience. Indeed, children losses his/her parents, sister, or brother have to achieve a method by which he/she be able to avoid its pressure. The purpose of this study is to examine the effect of cognitive-behavioral treatment on depression symptoms and adaptability of the students with abnormal grief. The research is a semi-experimental pretest-posttest study with control group. In order to this, a sample of 20 students, who had symptoms of research variables, was selected from statistical population after primary study through convenience sampling method. The sample members were appointed to the control and experimental groups randomly. Data-measurement tools were California individual-social adaptability test and depression test. The reliability and validity of the tests have already been examined and confirmed in past studies. The research data was analyzed in the SPSS through COVARIANCE analysis. The findings of this study revealed that there is a significant difference between performances of experimental and control groups in terms of individual-social adaptability test and depression test after adopting cognitive-behavioral treatments (p ≤ 0.05). Based on the findings of this study, it can be said that cognitive-behavioral treatment can be effective on decreasing depression symptoms and improving adaptability of the students with abnormal grief significantly. It can be said that the use of such a method can be effective on the students’ mental health.
Źródło:
World Scientific News; 2016, 46; 233-243
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of symptoms of climacteric syndrome, depression and insomnia on self-rated work ability in peri- and post-menopausal women in non-manual employment
Autorzy:
Humeniuk, E.
Bojar, I.
Gujski, M.
Raczkiewicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/2085207.pdf
Data publikacji:
2019
Wydawca:
Instytut Medycyny Wsi
Tematy:
depression
insomnia
peri- and post-menopausal women
work ability index
Greene Climacteric Scale
Beck Depression Inventory
Athens Insomnia Scale
climacteric syndrome
Opis:
Objective. The aim of the study was evaluation of the relationship between severity of symptoms of climacteric syndrome, depressive disorders and sleep problems, and the self-rated work ability of peri-menopausal and post-menopausal women in non-manual employment. Materials and method. The study included 287 women aged 45–60 years, employed in various institutions as non-manual workers. Work Ability Index, Greene Climacteric Scale, Beck Depression Inventory, and Athens Insomnia Scale were used. Results. The examined peri-menopausal and post-menopausal women in non-manual employment obtained good work ability on the Work Ability Index. The severity of menopausal syndrome, according to the Greene Climacteric Scale, was moderate, placing the examined women between results for the general population of women and the pattern for menopausal women. Depressive disorders ranked between low mood and moderate depression. No depression was observed in 59% of the women, whereas moderate depression was observed in 39%, and severe depression in only 2%. Sleep disorders were on the border of normal range. As many as 46% of the women had no sleep problems, which was on the border of normal range in 36%. Only 19% of the examined women suffered from insomnia. Work ability correlated negatively with depression and insomnia severity, as well as with psychological and vasomotor symptoms of climacteric syndrome, but not to its somatic symptoms. Conclusions. Preventing the occurrence and treatment of menopausal symptoms, sleep and mood disorders may contribute to maintaining the work ability of women in peri- and post-menopausal age.
Źródło:
Annals of Agricultural and Environmental Medicine; 2019, 26, 4; 600-605
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Personality modifies the effect of post-traumatic stress disorder (PTSD) and society support on depression-anxiety-stress in the residents undergone catastrophic flooding in Henan, China
Autorzy:
Jing, Xiangzhi
Lu, Lingeng
Yao, Yongcheng
Powiązania:
https://bibliotekanauki.pl/articles/2118787.pdf
Data publikacji:
2022-09-05
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
PTSD
personality
machine learning
flooding
society support
depression-anxiety-stress
Opis:
Background: To analyze the impact of the flood disasters, social support and personality on the mental health of residents in Henan Province, China, providing fundamental knowledges for making measuring strategies to improve the psychological protection and anti-stress ability of the residents after the disaster. Material and Methods: A cross-section study was conducted via an online survey platform “questionnaire star,” which included 572 residents in Henan Province, which underwent the history of ever flood disaster on July 20. The questionnaires of Impact of Event Scale-Revised Edition (IES-R), Perceived Social Support Scale (PSSS), the Depression Anxiety Stress Scales (DASS-21) and the scales of Eysenck Personality Questionnaire-Revised (EPQ-R) version in Chinese were also administered to each participant. Generalized linear regression model was performed. Results: The residents who live in the flooding areas, are male and married had a significantly higher post-traumatic stress disorder (PTSD) score than their counterparts. The scores of depression-anxiety-stress in the residents with stable emotion were significantly lower than those with unstable emotion (p < 0.001). Machine learning showed that PTSD ranked the top risk factor, followed by neuroticism for Depression-Anxiety-Stress after disaster. The PTSD was negatively correlated with social support (p < 0.01), while it was positively correlated with depression-anxiety-stress and emotional stability (p < 0.01). There was a statistically significant interaction between PTSD, social support and neuroticism on depression-anxiety-stress (p < 0.001), with an independent effect of 1.4% on depression-anxiety-stress. Emotional stability showed the largest association with depression-anxiety-stress. Conclusions: Residents living in the catastrophic flooding areas had significant post-traumatic mental health issues, and the severity of mental problems was differently affected by post-traumatic stress disorder and social support in individuals with different personalities. Introvert and PTSD were the major risk factors for depression-anxiety-stress after the disaster.
Źródło:
Medycyna Pracy; 2022, 73, 4; 305-314
0465-5893
2353-1339
Pojawia się w:
Medycyna Pracy
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 14

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