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MODERN heavy‐duty motor oils are almost invariably formulated with detergent‐dispersant type of additives. The types of additive normally employed for this purpose are organo‐metallic detergent‐dispersants such as metal salts (barium/calcium) of alkyl phenols, petroleum and synthetic sulphonic acids, condensation products of olefins and P2S5, alkyl salicylic acids, etc., on the one hand, and the polymeric ashless types of dispersants such as polymethacrylic esters and N‐substituted long chain alkyl succinimides, on the other. Barium and calcium salts of the petroleum sulphonic acids, however, are by far the most widely used dispersant‐detergent additives. These additives are manufactured from the sodium salts or the sulphonic acids obtained as a by‐product during the sulphonation of mineral oils for the manufacture of white oils and transformer oils. The average molecular weight of the sodium salts is in the range 450—500.

The reduction of running‐in time is a major problem occuping the attention of engine manufacturers. Three expediencies followed in the past with the object of cutting down running‐in time were the provision of:

The rust inhibiting characteristics of barium/calcium petroleum sulphonates, prepared from two indigenously available base stocks of different origin have been determined in concentration ranging from 0.5 to 3.0% W/W in mineral oil as per ASTM D‐1748 method. The products have been characterised as ‘outstanding’, ‘good’ and ‘satisfactory’ on the basis of their performance in the humidity cabinet. It has been observed that Ba/Ca petroleum sulphonates possessing outstanding rust inhibiting characteristics show low oil/water interfacial tension and high water solubilization characteristics as compared to other sulphonates. It has also been observed that the rust inhibiting characteristics are profoundly influenced by the structural parameter of the hydrocarbon portion of the petroleum sulphonates. The larger the alkyl side chain, the better is the rust inhibiting properties.

TABLE V together with Figures 1 and 2 featured in the first part of this paper, were published in our previous issue, but for ease of reference they are repeated in this concluding contribution.

The screening of lube oil performance prior to field trials is the most significant for the formulation of novel lubricants. This paper aims to investigate the efficacy of trimethylolpropane trioleate oil (TMPTO) based lubricants with different additives.

In this endeavor, initially five lubricating blends along-with TMPTO based oil with variable additives were evaluated for their tribological performances using ASTM standards. Out of these, the top three best-performing oils were further investigated for possible physical or chemical synergies among lube oils, additives and ball surface using SEM. The molecule structures of TMPTO based lube oils were confirmed using Fourier transform infrared spectroscopy (FTIR).

The wear preventive and extreme pressure characteristics of different TMPTO based samples were evaluated and compared for compatibility and synergy of additives. Morphological analysis of SEM images was used to understand the wear behavior of the worn surfaces.

Further investigation of TMPTO oil on its oxidation stability at high temperature and pressure to make it technologically competitive and commercially viable metal-working lubricant is suggested.

This paper highlights the tribo-effects of TMPTO to be rendered as a suitable lubricant for metal-cutting operations. The surface morphology of the worn-out surface significantly demonstrates the effect of loading conditions.

This study aims to analyze the establishment of sustainable microfranchises by women victims of the conflict (WVC) entrepreneurs who suffered the consequences and impacts of the longest-running internal conflict in the Americas. Additionally, this research seeks to underscore the transformative role of women entrepreneurs-for-peace (WE4P) in a post-peace agreement society.

This study seeks to contribute to theory building on sustainable business models (SBMs) at the base of the pyramid (BoP) theory from a single case study of the Colombian microfranchise TechOil. The theoretical sampling process guided the selection of data sources, which include semi-structured interviews, company and microfranchise donors’ reports, websites and external expert interviews to support the findings. The research adopts a framework of intro-entrepreneurship characteristics, ambiance, organization and sustainability.

TechOil offers a valuable case study for understanding how the phenomenon of microfranchise as an SBM spills over the BoP and promotes gender equality. The authors also developed a new SBM typology by extending the theory inductively.

The paper highlights WE4P and introduces microfranchises as a new SBM typology, offering insights into policy, practice and societal transformation in post-peace agreement zones.

The issue of WVC entrepreneurs in post-peace agreement settings remains under-reviewed and under-theorized. This study’s originality lies in introducing microfranchises as a new SBM typology, emphasizing the importance of gender equality and women’s roles in sustainable development and addressing the overlooked link between entrepreneurship and peace, contributing to global applicability.

Este estudio tiene como objetivo analizar el establecimiento de microfranquicias sostenibles por parte de emprendedoras Víctimas del Conflicto (WVC, por sus siglas en inglés) que sufrieron las consecuencias e impactos del conflicto interno más largo en América. Además, esta investigación busca resaltar el papel transformador de las mujeres emprendedoras por la paz (WE4P) en una sociedad posterior a un acuerdo de paz.

Este estudio busca contribuir a la construcción de teoría sobre modelos de negocios sostenibles - SBM según la teoría de la Base de la Pirámide - BoP a partir de un estudio de caso único de la microfranquicia colombiana TechOil. El proceso de muestreo teórico guió la selección de fuentes de datos, que incluyen entrevistas semiestructuradas, informes de la empresa y donantes de microfranquicias, sitios web y entrevistas con expertos externos para respaldar los hallazgos. La investigación adopta un marco de características introemprendedoras, ambiente, organización y sostenibilidad.

TechOil ofrece un valioso estudio de caso para comprender cómo el fenómeno de la microfranquicia como SBM se extiende más allá de la BoP y promueve la igualdad de género. Los autores también desarrollaron una nueva tipología de SBM al extender la teoría de manera inductiva.

El artículo destaca a las WE4P e introduce las microfranquicias como una nueva tipología de SBM, ofreciendo ideas sobre política, práctica y transformación social en zonas posteriores a un acuerdo de paz.

El tema de las emprendedoras WVC en contextos posteriores a un acuerdo de paz sigue siendo poco estudiado y teorizado. La originalidad de este artículo radica en introducir las microfranquicias como una nueva tipología de SBM, enfatizando la importancia de la igualdad de género y el papel de las mujeres en el desarrollo sostenible, y abordando el vínculo pasado por alto entre el emprendimiento y la paz, contribuyendo a la aplicabilidad global.

Este estudo tem como objetivo analisar o estabelecimento de microfranquias sustentáveis por empreendedoras Vítimas do Conflito (WVC) que sofreram as consequências e impactos do conflito interno mais longo das Américas. Além disso, esta pesquisa busca destacar o papel transformador das mulheres empreendedoras pela paz (WE4P) em uma sociedade pós-acordo de paz.

Este estudo busca contribuir para a construção de teoria sobre modelos de negócios sustentáveis - SBM segundo a teoria da Base da Pirâmide - BoP a partir de um estudo de caso único da microfranquia colombiana TechOil. O processo de amostragem teórica orientou a seleção de fontes de dados, que incluem entrevistas semiestruturadas, relatórios da empresa e doadores de microfranquias, sites e entrevistas com especialistas externos para respaldar os achados. A pesquisa adota um quadro de características introempreendedoras, ambiente, organização e sustentabilidade.

A TechOil oferece um valioso estudo de caso para entender como o fenômeno da microfranquia como SBM se estende além da BoP e promove a igualdade de gênero. Os autores também desenvolveram uma nova tipologia de SBM ao estender a teoria de forma indutiva.

O artigo destaca as WE4P e introduz as microfranquias como uma nova tipologia de SBM, oferecendo insights sobre política, prática e transformação social em zonas pós-acordo de paz.

O tema das empreendedoras WVC em contextos pós-acordo de paz ainda é pouco estudado e pouco teorizado. A originalidade deste artigo reside em introduzir as microfranquias como uma nova tipologia de SBM, enfatizando a importância da igualdade de gênero e o papel das mulheres no desenvolvimento sustentável, e abordando o elo negligenciado entre empreendedorismo e paz, contribuindo para a aplicabilidade global.

The purpose of this paper is to study the antirust, tribological performance and anti-wear (AW) mechanism of the of soybean lecithin (SL) as a kind of multifunctional lubricant additive.

As a kind of multifunctional lubricant additive, the antirust performance of SL was tested according to ASTM D 665, and meanwhile, its tribological performances were also evaluated by Optimol SRV-I oscillating reciprocating friction and wear tester and four ball tester. The worn steel surfaces were investigated by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS).

The results showed that the SL exhibited excellent antirust properties in different base stock, and could effectively improve the AW and extreme pressure (EP) performances. The results of SEM and XPS indicated that a protective film was formed between steel-steel friction pair during the tribological test.

This paper first investigated the antirust properties and the tribological mechanism of the SL as a kind of multifunctional lubricant additive, which can be very useful and will promote the application of SL in lubricant industry.

This paper aims to present two Anand’s model parameter sets for the multilayer silver–tin (AgSn) transient liquid phase (TLP) foils.

The AgSn TLP test samples are manufactured using pre-defined optimized TLP bonding process parameters. Consequently, tensile and creep tests are conducted at various loading temperatures to generate stress–strain and creep data to accurately determine the elastic properties and two sets of Anand model creep coefficients. The resultant tensile- and creep-based constitutive models are subsequently used in extensive finite element simulations to precisely survey the mechanical response of the AgSn TLP bonds in power electronics due to different thermal loads.

The response of both models is thoroughly addressed in terms of stress–strain relationships, inelastic strain energy densities and equivalent plastic strains. The simulation results revealed that the testing conditions and parameters can significantly influence the values of the fitted Anand coefficients and consequently affect the resultant FEA-computed mechanical response of the TLP bonds. Therefore, this paper suggests that extreme care has to be taken when planning experiments for the estimation of creep parameters of the AgSn TLP joints.

In literature, there is no constitutive modeling data on the AgSn TLP bonds.

This study evaluates the effect of the media image content of business to business (B2B) organizations to accelerate social media engagement. It highlights the importance of strategically designing image content for business marketing strategies.

This study designed a computation extensive research model based upon the stimulus-organism-response (SOR) theory using 39,139 Facebook posts of 125 organizations selected from Fortune 500 firms. Attributes from images and text were estimated using deep learning models. Subsequently, inferential analysis was established with ordinary least squares regression. Further machine learning algorithms, like support vector regression, k-nearest neighbour, decision tree and random forest, are used to analyze the significance and robustness of the proposed model for predicting engagement metrics.

The results indicate that the social media (SM) image content of B2B firms significantly impacts their social media engagement. The visual and linguistic attributes are extracted from the image using deep learning. The distinctive effect of each feature on social media engagement (SME) is empirically verified in this study.

This research presents practical insights formulated by embedding marketing, advertising, image processing and statistical knowledge of SM analytics. The findings of this study provide evidence for the stimulating effect of image content concerning SME. Based on the theoretical implications of this study, marketing and media content practitioners can enhance the efficacy of SM posts in engaging users.

We analyze trading activity accompanying equities’ switches from “growth” (low book‐tomarket ratios (BMRs)) to “value” (high BMRs), and vice versa. We find that a large BMR increase, that is a shift from growth to value, is accompanied by a strongly negative small order imbalance (OIB). Large OIB exhibits weaker patterns across stocks that experience large changes in book/market. The evidence indicates that growth‐to‐value shifts are more strongly related to small traders than large ones. The interaction of BMRs with order flows plays a crucial role in return predictability. Specifically, the predictive ability of BMRs for future returns is significantly enhanced for those stocks that have experienced book/market increases as well as high levels of net selling by way of small orders.