ANALYSIS OF BULK ARRIVALS IN QUEUEING MODELS

       Present paper surveys the literature on bulk queueing models. The concept of bulk arrivals and bulk services has gained a tremendous significance in present situations. Due to congestion problem everywhere (banks, metro stations, bus stops, railway reservation, traffic … etc.) researchers have to focus their attention to develop models and mechanism to deal with the same. A number of models have been developed in the area of queueing theory incorporating bulk queueing models. These bulk queueing models can be applied to resolve the congestion problems. Through this survey, an attempt has been made to review the work done on bulk queues, modeling various phenomenons. The goal is to provide sufficient information to analysts, managers and industry people who are interested in using queueing theory to model congestion problems and want to locate the details of relevant models

An Overview of Electronic Waste as Aggregate in Concrete

Rapid growth of world population and widespread urbanization has remarkably increased the development of the construction industry which caused a huge demand for sand and gravels. Environmental problems occur when the rate of extraction of sand, gravels, and other materials exceeds the rate of generation of natural resources; therefore, an alternative source is essential to replace the materials used in concrete. Now-a-days, electronic products have become an integral part of daily life which provides more comfort, security, and ease of exchange of information. These electronic waste (E-Waste) materials have serious human health concerns and require extreme care in its disposal to avoid any adverse impacts. Disposal or dumping of these E-Wastes also causes major issues because it is highly complex to handle and often contains highly toxic chemicals such as lead, cadmium, mercury, beryllium, brominates flame retardants (BFRs), polyvinyl chloride (PVC), and phosphorus compounds. Hence, E-Waste can be incorporated in concrete to make a sustainable environment. This paper deals with the composition, preparation, properties, classification of E-Waste. All these processes avoid dumping to landfills whilst conserving natural aggregate resources, and providing a better environmental option. This paper also provides a detailed literature review on the behaviour of concrete with incorporation of E-Wastes. Many research shows the strong possibility of using E-Waste as a substitute of aggregates eventually it reduces the use of natural aggregates in concrete

Multivariate analysis on blackgram genotypes for bruchine (Callosobruchus maculatus F.) resistance towards selection of parental lines

Black gram (Vigna mungo (L.) Hepper) is one of the most important pulse crops in daily diets. However, black gram production and post-harvest preservation are still tedious due to the losses caused by the storage pest bruchine, Callosobruchus maculatus (F.), both quantitatively and qualitatively.   Hence, the present study involves the utilization of the multivariate analysis by effectively understanding variation among the genotypes based on their level of bruchine infestation. The multivariate studies indicated that the traits viz., the total number of adult emergence (AE), seed damage % (SD) and seed weight loss % (SWL) had more variation and with more significant correlation among them.  Also, these traits are the most influential principal component traits governing 88% of the variation among genotypes. The divergence analysis showed that the genotype TU 68 found in cluster II would have the potential to create the variation for bruchine infestation among the black gram genotypes involved in the study.  As it has scored lesser adult emergence (AE) (7 adults), seed damage % (SD) (14 %) and seed weight loss % (SWL) (17.79 %)  than the other genotypes. It shows the resistant nature of the genotype against bruchine beetles. Hence, TU 68 could be utilized in the future hybridization programme as a donor for bruchine resistance

Farmers’ willingness to supply biomass for energy generation: evidence from South and Central Poland

The objective of this survey-based study was to investigate farmers’ willingness to supply biomass for power generation in the south and in the centre of Poland. In total, 210 farmers participated in this study by filling in a self-instructed questionnaire. The results indicate that the majority of farmers (two-thirds) in both regions appeared unwilling to collect, store and transport biomass to the market or to the energy production facility. It is likely that an unstable biomass market marked by low demand and low prices has led to unwillingness by farmers to engage in bioenergy production in Poland. Increasing the role of biomass as a renewable energy resource and recovering the farmers’ confidence in the market would require fixing the shortcomings in the biomass market and the provision of clear public policies that aim at long-term market stability

Renewable Energy in the Pomerania Voivodeship - Institutional, Economic, Environmental and Physical Aspects in Light of EU Energy Transformation

In the era of globalization and rapid economic growth, affecting most world economies, increased production and consumption are leading to higher levels of energy production and consumption. The growing demand for energy means that energy resources from conventional sources are not sufficient; moreover, its production generates high costs and contributes to the emission of greenhouse gases and waste. In view of the above, many countries have opted to implement an energy transformation. The energy transition allows the transition from an energy system based on conventional fuels to an energy system based mainly on renewable energy (RE) and low-emission sources. In the EU, the development of a “green economy” has become a strategic goal in the fight against climate change. The development of RE offers the possibility to improve the energy security of a given country and the entire EU. New, innovative technologies of RE also increase the attractiveness and competitiveness of the economies of the Member States. In line with the EU strategy, the activities carried out aim to achieve a situation in which, in 2050, the activities of economies will not endanger the environment. The main purpose of this article was the assessment of the RE sector in the Pomerania region in the context of energy transformation. To achieve this goal, PEST analysis regarding the functioning of the RE sector in the selected Polish region was used and the potential of the RE sector was determined using GIS tools on the basis of physical conditions. The article presents the research hypothesis that the RE sector within the Pomerania Voivodeship possesses appropriate energy potential, which will allow this Voivodeship to become an energy self-sufficient region based on the use of these energy sources (according to EU strategy). The implementation of the goal set in the article allowed for the verification of the research hypothesis, where the determined energy potential from the RE sector would cover the Voivodeship’s needs due to the use of electricity and heat. The conducted research shows that the RE sector in these regions has high energy potential to meet the criteria outlined in EU legal documents and to implement them successfully within the intended period

Public Perceptions of MSW Management in Wrocław City, Poland

Elevating public awareness of waste management at the household level is a cost effective and a win-win social, economic and environmental approach on the table of policymaking. Modern and effective waste management bring about broader economic efficiency and social equity, mitigate consumerism, thus, promoting the conservation of natural resources. In this article, a survey study was conducted among the citizens of Wrocław city, Poland. The city is dynamic, touristic, and industrial. Through random sampling, 160 respon-dents filled in the questionnaire. The results revealed that the participantsappeared aware of the benefits of waste management (WM); however the current WM systems and infrastructures are not very satisfying. The partici-pants identified several shortcomings in the current WM systems such as the lack of sufficient colored bins forglass recycling, overfilled bins and heavy lids, and irregular waste collection system. The study proposes a pub-lic -oriented outreach campaign targeting waste separation and less-waste be-haviors as economically and environmentally beneficial, accompanied by continuous development of WM regulations and infrastructures and linked it to waste-to-energy systems and technologies to assist in achieving the long-term energy and emissions-reduction targets

Farmers' perceptions of the challenges facing the biomass market in Poland; a case study from South and Central Poland

Farmers’ perceptions and values are a fundamental part of a polycentric approach aimed at improving the financial feasibility of biomass-based enterprises. In this survey-based study, 210 farmers from central (Torun province) and southern (Upper Silesia region) Poland completed a self- instructed questionnaire dealing with their perceptions of the challenges currently facing the biomass market and their willingness to change from traditional farming to feedstock production for energy generation. The results indicate that only 12% of the farmers are willing to switch to biocrop cultivation. Moreover, selected socio-economic and demographic variables (gender, age) had an impact on their willingness to adopt energy crops. All the presented challenges appeared to be of high relevance to the farmers who participated in this study. However, farmers from Torun province attributed substantial relevance to the social transformation in the agriculture sector, and to the lack of seasonal workers. In the Upper Silesia region, the lack of a well-established biomass market was of greatest relevance. A cross-tabulation method revealed statistical differences between the perceived value of farming and the farmers’ perceptions toward the challenges facing the biomass market. These findings are insightful for policies that aim to address the shortcomings in current biomass market development in Poland

Synthesis and crystal structures of 5'-phenylspiro[indoline-3, 2'-pyrrolidin]-2-one derivatives

<p>Abstract</p> <p>Background</p> <p>The spiro- indole-pyrrolidine ring system is a frequently encountered structural motif in many biologically important and pharmacologically relevant alkaloids. The derivatives of spirooxindole ring systems are used as antimicrobial, antitumour agents and as inhibitors of the human NKI receptor besides being found in a number of alkaloids like horsifiline, spirotryprostatin and (+) elacomine. The recently discovered small-molecule MDM2 inhibitor MI-219 and its analogues are in advanced preclinical development as cancer therapeutics.</p> <p>Results</p> <p>In the crystal structures of the two organic compounds, 4'-Nitro-3',5'-diphenylspiro[indoline-3,2'-pyrrolidin]-2-one and 3'-(4-Methoxyphenyl)- 4'-nitro -5'-phenylspiro[indoline-3,2'-pyrrolidin]-2-one, N-H···O hydrogen bonds make the R²₂(8) ring motif. Further, the structures are stabilized by intermolecular hydrogen bonds.</p> <p>Conclusion</p> <p>The crystal structures of 4'-Nitro-3',5'-diphenylspiro[indoline-3,2'-pyrrolidin]-2-one and 3'-(4-Methoxyphenyl)- 4'-nitro -5'-phenylspiro[indoline-3,2'-pyrrolidin]-2-one have been investigated in detail. In both the compounds, the R²₂(8) motif is present. Due to the substitution of methoxyphenyl instead of phenyl ring, the entire configuration is inverted with respect to the 2-oxyindole ring.</p