93 research outputs found
Synthesis of quinoxaline derivatives catalyzed by Brønsted acidic ionic liquid under solvent-free conditions
No full textBrønsted acidic ionic liquid (BAIL) found an efficient and eco-friendly for quinoxaline preparation via condensation of 1,2-phenylene diamines and 1,2-diketones. This simple protocol is carried out under solvent-free condition and at room temperature. Relatively short reaction times, high yields, efficiency, generality, simple methodology, low-cost materials, easy work-up, ease of preparation and regeneration of the catalyst and green conditions are the main advantages of this protocol. © 2020 Author(s).A. Majee acknowledges financial support from the CSIR-major research project (ref. No. 02(0383)/19/EMR-II). A. Mukherjee is thankful to the Russian Science Foundation – Russia (ref. # 18-73-00301) for funding. We are thankful to the DST-FIST and UGC-SAP program
Dilepton signal of a type-II seesaw model at CERN LHC: Reveals a TeV scale B-L symmetry
No full textWe explore the discovery potential of doubly charged Higgs bosons (xi(+/-+/-)) at the CERN Large Hadron Collider (LHC). For moderate values of the coupling constants in the original Type-II seesaw model, these doubly charged Higgs bosons are not accessible at any present or near future collider experiments. In a gauged B - L symmetric model we introduce two triplet scalars to execute a variant of type-II seesaw at the TeV scale. This leads to a clear like-sign dilepton signal in the decay mode of xi(+/-+/-) for a small vacuum expectation value (less than or similar to 10(5) eV) of the triplet scalar xi = (xi(++), xi(+), xi(0)) of mass less than or similar to 1 TeV. To be specific, for a mass range of 200-1000 GeV of xi(+/-+/-), the like-sign dilepton signal can be detected at CERN LHC at a center of mass energy 14 TeV with an integrated luminosity, say, greater than or similar to 30 fb(-1). The same analysis is also pursued with center of mass energies 7 TeV and 10 TeV as well. We also comment on the decay mode of singly charged scalars and the neutral B - L gauge boson in this model
Community leadership and health promotion: Lessons from rural South Africa
No full textSession presented on Saturday, July 23, 2016, Sunday, July 24, 2016:
Purpose: Rural communities have continued to face a complex set of challenges: geographic isolation, high levels of poverty, sparse and declining human population, as well as loss of jobs and economic opportunities. These factors create two big challenges for rural communities -- continued rural urban migration of predominantly young people and a pool of disengaged youth among those that stay. Because of this, rural communities have a greater human capital need for more leaders. Though actively engaging community leaders in building programs and policies that consider equity and liveability of environments is important, little research has been done to examine the issue at a local level, particularly in rural settings. While the goal of all leadership development initiatives is to develop and equip leaders with necessary skills to create change at different levels, from individual to societal significant impact is achieved when programming targets local community members (UNDP, 2006). The objective of this study was to explore the experiences of community leaders on their role in health promotion in a rural community. Community leadership development is one intervention commonly used to unlock community assets and release people\u27s potential to participate in activities that affect their health and socioeconomic well-being (Blanchard, 2012; Majee, Maltsberger, Johnson, & Adams, 2014). It recognizes the need for community members to acquire and apply skills, through involvement, in shaping the decisions and policies that affect their lives (Langone & Rohs, 1995; National Extension Task Force, 1986). The study aimed at a) identifying current barriers and opportunities for the inclusion and advancement of youth and women in resource limited communities in health promoting activities, and b) identifying potential interventions for empowering local communities to engage in and lead health promoting initiatives.
Methods: A qualitative, exploratory design was followed. Burns and Grove (2003:313) define exploratory research as research conducted to gain new insights, discover new ideas and/or increase knowledge of a phenomenon. Creswell (2013:37) states that to study a problem, qualitative researchers use an emerging qualitative approach to inquiry and the collection of data in a natural setting sensitive to the people and places under study. Eighteen semi-structured individual interviews were conducted over a period of one month with purposively sampled community leaders such as school principals, church leaders, nurses, directors of non-governmental organizations, local government officials. The participants were males and females over the age of 35. Open coding was used to organize data collected in the unstructured individual interviews (Creswell 2012:244). An independent coder assisted the researchers and a consensus discussion was held to finalise the themes and categories that emerged. Five themes emerged which focused on the actions that needed to be taken to empower community leaders to play a more active role in health promotion.
Results: Community leaders need to implement activities that promote the health of community members through support services, promoting collaboration between different stakeholders to establish a multidisciplinary team approach while having a personal vision in addressing the needs of the community. Participation of different generations in the community is essential to promote health within economical and financial constraints.
Conclusion: Facilitation of improved interpersonal relationships and coordination of community activities are needed in order to use the available resources in a more effective way
An Engineering Point of View on the Use of the Hydrogels for Pharmaceutical and Biomedical Applications
No full textChap. 8. In this chapter, the modern uses of hydrogels in pharmaceutical and biomedical
applications are revised following an engineering point of view, i.e. focusing the attention
on material properties and process conditions. The chapter discusses the applications
following the increase in scale‐size. First, the nanoscale systems, i.e. hydrogel nanoparticles
(HNPs), are analysed in terms of preparative approaches (polymerization methods
and uses of preformed polymers) and with a brief mention of the future trends in the field.
Secondly, systems based on hydrogel microparticles (HMPs) are examined following the
same scheme (polymerization methods, uses of preformed polymers, a mention of novel
and future trends). Thirdly, and last but not the least, the hydrogel‐based drug delivery
systems (macroscopic HB‐DDSs) are presented, focusing in particular on tablets made of
hydrogels, discussing the characterization methods and on the modelling approaches
used to describe their behaviour. Other macroscopic systems are also discussed in brief.
Even if the vastness of the field makes its discussion impossible in a single chapter, the
presented material can be a good starting point to study the uses of hydrogels in
pharmaceutical and biomedical sciences
A bond orbital approach to theoretical studies of molecular properties from a fully localised SCF method
No full text1-5The charge distributions, dipole moments and J-J coupling constants of some simple σ-bonded molecules have been calculated using a newly developed method within the framework of bond-orbital SCFMO approach that includes only the theoretically justified parameters and optimised hybrid orbitals. The results agree well with ab initio and some semi-empirical results. The computing times are extremely short
- …
