scholarly journals Mitigation of False Brinelling in A Roller Bearing: A Case Study of 4 Types of Greases

2021 ◽  
Author(s):  
Chih-Ling Lin ◽  
Paul A. Meehan ◽  
Khosro Fallahnezhad ◽  
Osama Brinji
Keyword(s):  
Roller Bearing ◽  
Low Frequency ◽  
Roller Bearings ◽  
Viscous Oil ◽  
Sea Transportation ◽  
Dialkyl Dithiophosphates ◽  
First Time ◽  
Mechanochemical Reactions ◽  
Surface Chemical Analysis

Abstract Four commercial greases with various thickeners and base oils were experimentally examined to compare their false brinelling wear resistance in a test rig simulating roller bearings during rail/sea transportation for the first time. Greases containing zinc dialkyl dithiophosphates (ZDDP) showed superior false brinelling reduction, evidenced by no visible wear mark in the raceways. The mechanism for false brinelling mitigation was shown to be from a ZDDP-induced tribofilm which decreases the friction and wear coefficient in the contact area. Surface chemical analysis showed that for grease lubricated fretting contacts, ZDDP-derived tribofilms can be generated in the presence of micro-sliding motions and energy dissipation at the contact interface at low frequency (i.e. 4-8 Hz), due to the mechanochemical reactions. For greases without ZDDP, false brinelling wear was reduced by 97% when using grease with a more abundant and less viscous oil, which bleeds readily from an open structured thickener. The results highlight the ability of ZDDP as an additive in grease to better protect roller bearings against false brinelling during rail/sea transportation.

Probing self-associated intermolecular H-bonding using low-frequency SERS coupled with mid-IR SERS and DFT study: a case study of 2-MBA adsorbed on ZnO nanoparticles

2019 ◽  
Vol 21 (38) ◽  
pp. 21431-21437
Author(s):  
Om Prakash ◽  
Ranjan K. Singh
Keyword(s):  
Intermolecular Interactions ◽  
Zno Nanoparticles ◽  
Low Frequency ◽  
Dft Study ◽  
First Time

In the present study, low-frequency SERS is reported for the first time to investigate intermolecular interactions.

Islamic and Jewish Religious Feminists Tackle Islamic and Jewish Oral Law: Maintenance and Rebellion of Wives

2017 ◽  
Vol 11 (1) ◽  
pp. 35-63
Author(s):  
Ruth Roded
Keyword(s):  
State Policy ◽  
Political System ◽  
Daily Life ◽  
The State ◽  
The Political ◽  
Jewish Law ◽  
Modern Times ◽  
Parallel Case ◽  
First Time

Beginning in the early 1970s, Jewish and Muslim feminists, tackled “oral law”—Mishna and Talmud, in Judaism, and the parallel Hadith and Fiqh in Islam, and several analogous methodologies were devised. A parallel case study of maintenance and rebellion of wives —mezonoteha, moredet al ba?ala; nafaqa al-mar?a and nush?z—in classical Jewish and Islamic oral law demonstrates similarities in content and discourse. Differences between the two, however, were found in the application of oral law to daily life, as reflected in “responsa”—piskei halacha and fatwas. In modern times, as the state became more involved in regulating maintenance and disobedience, and Jewish law was backed for the first time in history by a state, state policy and implementation were influenced by the political system and socioeconomic circumstances of the country. Despite their similar origin in oral law, maintenance and rebellion have divergent relevance to modern Jews and Muslims.

scholarly journals Erratum: Gravrok, J., et al. Beyond the Benefits of Assistance Dogs: Exploring Challenges Experienced by First-Time Handlers. Animals 2019, 9, 203

Animals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 237
Author(s):  
Jennifer Gravrok ◽  
Dan Bendrups ◽  
Tiffani Howell ◽  
Pauleen Bennett
Keyword(s):  
Assistance Dogs ◽  
First Time

The authors wish to make the following corrections [1]:In Table 1, under case study 4, the code was originally labeled as H8, P8 and ADI 8; these labels should be H4, P4 and ADI 4, respectively [...]

scholarly journals Investigating the Concerns of First-Time Distance Education Instructors

2019 ◽  
Vol 20 (5) ◽  
Author(s):  
Halil Kayaduman ◽  
Turgay Demirel
Keyword(s):  
Distance Education ◽  
Content Knowledge ◽  
Stages Of Concern ◽  
Concerns Based Adoption Model ◽  
Descriptive Case Study ◽  
Time Distance ◽  
Adaptation Processes ◽  
First Time ◽  
Ongoing Concern

The purpose of the study is to investigate the concern developments of first-time distance education instructors using the concerns-based adoption model (CBAM). This study used stages of concern (SoC), a component of CBAM, as its theoretical framework. A descriptive case study was implemented, which focused on the adaptation processes of nine instructors lecturing for the first time via distance education. The instructors attended a two-day training, which was designed based on their initial concerns. Then instructors implemented their courses for four weeks via distance education. While the informational and personal stages (self-concerns) decreased compared to the initial findings, the consequence stage increased in intensity. However, self-concerns remained predominant in the process despite the reduction in self-concerns and increase in the consequence stage. Based on the findings, the implications for distance education and recommendations for addressing the instructors’ concerns are discussed. Recommendations for alleviating the concerns of first-time distance education instructors include: the provision of ongoing concern-based interventions that incorporate technological, pedagogical, and content knowledge; providing working examples related to distance education from which instructors can learn vicariously; and encouraging collaboration among instructors.

scholarly journals Bearing Severity Fault Evaluation Using Contour Maps—Case Study

2021 ◽  
Vol 11 (14) ◽  
pp. 6452
Author(s):  
César Ricardo Soto-Ocampo ◽  
Juan David Cano-Moreno ◽  
José Manuel Mera ◽  
Joaquín Maroto
Keyword(s):  
Health Indicators ◽  
Bearing Faults ◽  
Contour Maps ◽  
Initial Stage ◽  
Critical Components ◽  
Bearing Damage ◽  
First Time ◽  
Current Operating

Increasing industrial competitiveness has led to an increased global interest in condition monitoring. In this sector, rotating machinery plays an important role, where the bearing is one of the most critical components. Many vibration-based signal treatments are already being used to identify features associated with bearing faults. The information embedded in such features are employed in the construction of health indicators, which allow for evaluation of the current operating status of the machine. In this work, the use of contour maps to represent the diagnosis map of a bearing, used as a health map, is presented for the first time. The results show that the proposed method is promising, allowing for the satisfactory detection and evaluation of the severity of bearing damage. In this initial stage of the research, our results suggest that this method can improve the classification of bearing faults and, therefore, optimise maintenance processes.

Are seasonal lakes as productive as permanent lakes? A case study from Ireland

2010 ◽  
Vol 67 (8) ◽  
pp. 1291-1302 ◽  
Author(s):  
Helder Cunha Pereira ◽  
Norman Allott ◽  
Catherine Coxon
Keyword(s):  
Seasonal Variation ◽  
Linear Regression ◽  
Chlorophyll A ◽  
Algal Biomass ◽  
P Limitation ◽  
Underlying Causes ◽  
Western Ireland ◽  
Log Linear ◽  
First Time

This paper compares, for the first time, nutrient levels and chlorophyll a measured in a set of seasonal lakes with those reported for permanent lakes in the literature. Twenty-two turloughs (karstic seasonal lakes) in western Ireland were sampled monthly from the onset of flooding (October) until they dried out (6 to 9 months). The turloughs showed similar levels of nutrients and chlorophyll a to those reported for Irish and international lakes. Chlorophyll a peaked between November and February in the majority of turloughs, sometimes with values higher than those measured in mesotrophic lakes in summer. A significant log-linear regression was found between total phosphorus and chlorophyll a, which suggests P limitation of algal biomass in the majority of the turloughs. The regression characteristics were not significantly different than those described in similar studies of permanent lakes. Patterns in seasonal variation of nutrients are also presented, their underlying causes being discussed in relation to their transport within catchments. Our results show that despite being predominantly winter phenomena, turloughs can be as productive as permanent lakes.

Do different parasite species interact in their effects on host fitness? A case study on parasites of the amphipod Paracalliope fluviatilis

Parasitology ◽  
2011 ◽  
Vol 138 (9) ◽  
pp. 1176-1182 ◽  
Author(s):  
C. A. RAUQUE ◽  
R. A. PATERSON ◽  
R. POULIN ◽  
D. M. TOMPKINS
Keyword(s):  
Parasite Species ◽  
Low Frequency ◽  
Host Population ◽  
Interactive Effects ◽  
Population Means ◽  
Significant Relationships ◽  
Coitocaecum Parvum ◽  
Paracalliope Fluviatilis ◽  
Generally True

SUMMARYThere is a gap in our understanding of the relative and interactive effects of different parasite species on the same host population. Here we examine the effects of the acanthocephalan Acanthocephalus galaxii, an unidentified cyclophyllidean cestode, and the trematodes Coitocaecum parvum and Microphallus sp. on several fitness components of the amphipod Paracalliope fluviatilis, using a combination of infection surveys and both survival and behavioural trials. In addition to significant relationships between specific parasites and measures of amphipod survival, maturity, mating success and behaviour, interactions between parasite species with respect to amphipod photophilia were also significant. While infection by either A. galaxii or C. parvum was associated with increased photophilia, such increases were negated by co-infection with Microphallus sp. We hypothesize that this is due to the more subtle manipulative effect of A. galaxii and C. parvum being impaired by Microphallus sp. We conclude that the low frequency at which such double infections occur in our sampled population means that such interactions are unlikely to be important beyond the scale of the host individual. Whether or not this is generally true, implying that parasitological models and theory based on single parasite species studies do generally hold, requires cross-species meta-analytical studies.

Dispute Settlement of Diplomatic Relation Reviewed In International Law (Case Study of Spionageburning Australia on The President of Indonesia)

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Muhammad Iqbal Baiquni
Keyword(s):  
International Relations ◽  
International Law ◽  
Dispute Settlement ◽  
Code Of Conduct ◽  
Qualitative Approach ◽  
Legal Research ◽  
Bilateral Relations ◽  
Final Settlement ◽  
First Time

<div><p class="abstract">The case of espionage or spying by Australia against Indonesia is not the first time, but there have been several attempts of espionage against Indonesia. This espionage act is an act of secretly collecting intelligence data in international relations in a country. In this paper, we discuss the wiretapping case and its resolution. This paper uses normative legal research with a qualitative approach. This paper examines the chronology of cases of tapping by Australia against Indonesia, wiretapping in human rights and international law, as well as the final settlement of tensions between Indonesia and Australia through an agreement on the Code of Conduct to normalize bilateral relations between the two countries.</p></div>

Beneficial effect of lithium in female patient with bipolar affective illness and psoriasis

2021 ◽  
Vol 37 (2) ◽  
Author(s):  
Przemysław Filipiak ◽  
Anna Jaskóła ◽  
Karolina Gattner
Keyword(s):  
Bipolar Disorder ◽  
Case Report ◽  
Beneficial Effect ◽  
Female Patient ◽  
Lithium Treatment ◽  
The Other ◽  
Patient Needs ◽  
Affective Illness ◽  
First Time

Objectives. Psoriasis makes a relative contraindication for lithium treatment which can exacerbate its symptoms or induce it itself. On the other hand, lithium exerts immuno-modulatory activity. Case study. In this paper, a case of a female patient is presented. The patient has been treated since 2012 for bipolar affective illness (bipolar disorder – BD) and psori­asis, which occurred for the first time during a depress­ive episode. Despite intensive pharmacological treatment, both as inpatient and outpatient, a satisfactory improvement of affective illness has not been obtained. After the introduction of lithium, a remission of BD was achieved as well as a reduction of psoriatic changes, which have been maintained until now (2021). Conclusion. The remission of Bipolar Disorder (BD) on lithium can suggest that the patient belongs to the group of the so-called excellent lithium responders. In the presen­ted case remission of psoriasis was observed during lithium treatment. This case report must be treated with caution because remission could be spontaneous and the patient needs further observation.

SWOT APPLICATION ON DETERMINING SHIP YARD DEVELOPMENT STRATEGIES: A CASE STUDY

JOURNAL ASRO ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 37
Author(s):  
Ikhwan Syahtaria ◽  
Sukarno Sukarno ◽  
Ali Mashudi ◽  
Edy Widodo
Keyword(s):  
Human Resources ◽  
Development Strategy ◽  
Swot Analysis ◽  
Shipping Industry ◽  
Rapid Progress ◽  
Ship Building ◽  
Sea Transportation ◽  
Qualitative Descriptive ◽  
The Government

Sea transportation is a major factor connecting the islands of Indonesia which has strategic and important value in supporting the sustainability of the national economy. Along with the government's policy on the sea highway program and the development of the domestic shipping industry, the growth of the commercial fleet, especially vessels, is currently experiencing rapid progress. In supporting the government program and the demand for reparation and procurement of new ships in domestic production, readiness is required from the shipyard. However, the current condition of the shipyard is only able to meet 83% of the demand for new shipbuilding so that the shipyard still needs to be developed in order to improve its capabilities, so that it can meet the needs and be able to carry out its functions in accordance with the progress of shipping technology. In this study discusses the strategy of developing shipbuilding using qualitative descriptive methods and quantitative SWOT analysis. In this case study shipyard development strategy by increasing the ability of shipyards to meet the demands of ship building by increasing supporting facilities and accompanied by increasing the ability of human resources in the mastery of science and technology. Besides also by conducting cooperation with the domestic shipping industry in the procurement of supporting partsKeywords: Shipyard, Maintenence, SWOT Analysis, Developmen Strategy

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