The Jamio{\l}kowski isomorphism and a conceptionally simple proof for the correspondence between vectors having Schmidt number kk and kk-positive maps

Positive maps which are not completely positive are used in quantum information theory as witnesses for convex sets of states, in particular as entanglement witnesses and more generally as witnesses for states having Schmidt number not greater than k. It is known that such witnesses are related to k-positive maps. In this article we propose a new proof for the correspondence between vectors having Schmidt number k and k-positive maps using Jamiolkowski's criterion for positivity of linear maps; to this aim, we also investigate the precise notion of the term "Jamiolkowski isomorphism". As consequences of our proof we get the Jamiolkowski criterion for complete positivity, and we find a special case of a result by Choi, namely that k-positivity implies complete positivity, if k is the dimension of the smaller one of the Hilbert spaces on which the operators act.Comment: 9 page

Evaluating sustainable energy potentials through carbon emission assessment of small and medium-sized enterprises in the global south: a case in Wula, CRS Nigeria

There is increasing focus on sustainable energy in developing countries as part of their transition to low carbon economy. Approximately, 40% of the world’s population, mostly in low- and middle-income countries, do not have access to modern energy. Developing countries including Nigeria are facing energy poverty. Small and medium-sized enterprises (SMEs) have a role in achieving the United Nations’ (UN) Sustainable Development Goals (SDGs). Absence of sustainable energy is hindering the growth of SMEs in the Global South with impacts on society. In Nigeria, inaccessibility and regular outages of power from the national grid compels SMEs to rely on fossil-fuel based energy which exacerbate pollution and carbon footprint having environmental, social and economic consequences. This project evaluates the potential of sustainable energy in SMEs for minimizing carbon footprint and accelerating the energy transition in a local community of Wula, Nigeria. This exploratory investigation conducted semi-structured interviews with 16 SMEs to obtain data on energy consumption including energy type, quantity consumed and annual cost to estimate carbon footprint and identify sustainable energy needs. The study found that there is significant potential for sustainable energy in the local community and joined-up approach in interventions cannot only address environmental issues but social issues in the local community. The analysis indicates that SMEs spend $13,563.4 annually on fossil fuel-based energy and consume 33,215 litres of petrol/annum; and an estimated carbon footprint of 76,891.0642 KgCO2e (equivalent of 76.89106 tCO2e) per annum. The project helps to understand state of the problem and plans to reduce CO2 emissions and sustain SMEs by installing sustainable energy systems based on the community needs and contribute towards the SDGs. This could open new markets and business opportunities for the poor in the rural area, hence lift families out of poverty and transform lives as a contribution towards SDGs

A knowledge based decision support system for tool changeover in CNCs

This paper describes an application of an adaptive planning system for automatic tool changers in flexible manufacturing systems. The conventional models of predictive control usually cannot adapt to a real time dynamic environment. The proposed adaptive control model is capable of self adjusting to changing environments. The algorithm is based on a decision logic, which is constructed by breaking up knowledge and converting them into mathematical form in order to cover all possible conditions that can exist during the implementation phase. Expert thoughts and knowledge from decision logic are stored in the decision tree, which consists of circular nodes, arcs and decision nodes. The suggested system is capable of accepting further rules, new nodes and branches to the tree when additional attributes are needed. This whole knowledge is encoded in the form of production rules and each rule represents a small chunk of knowledge relating to the given domain of tool replacement. A number of related rules collectively respond to highly useful conclusions.The system uses VP Expert development shell, contains an inference engine and, a user interface. The originality of the proposed strategy lies in that a knowledge-based expert system is developed to identify and analyze the current conditions and then readjust the output that reflects the real-time environment. Compared with the various classical models, the approach can synthesize and analyze as many variables as possible to adequately and reliably identify the real-time conditions. Simulation results demonstrate the effectiveness and practicality of this tool-change planning and control strategy

Improved harvest and desapping practices affect mango fruit quality along the supply chains

This study was aimed at evaluating the impact of improved harvest and handling practices including careful fruit harvesting along with 4-6 inches long pedicels, de-stemming and de-sapping in 0.5% lime solution, 2-3 min dip and washing in tap water, on the fruit quality of mango along domestic supply chains in Pakistan compared with traditional harvest and handling system prevailing in local mango industry. Six domestic supply chains in two mango cultivars Sindhri and Samar Bahisht Chaunsa were monitored in this regard. The impact assessments were made on the basis of performance against sap burn, skin browning, lenticels spots, rots and physical damage. The effect on fruit skin color and firmness was also studied. Significant interaction of skin browning, sapburn injury, rots and physical damage was found with the practices adopted at farm level. These problems were found to start from farm (origin) and significantly increase along the supply chains depending upon the procedures adopted for produce harvest and handling. The fruits passed through improved practice had significantly better quality at retail with less skin browning (39.17% in improved vs 58.33% in traditional), low sap burn damage (15.83% vs 73.34%), smaller extent of rots (22.50% vs 68.33%) and physical damages (14.17% vs 34.17%). Non significant differences were found among the analyzed practices regarding fruit skin color, firmness and lenticel spots. Overall, the improved harvest and lime desapping technology showed potential as a best practice for the better management of mango fruit quality along the domestic supply chains. © 2011 Friends Science Publishers

Improved harvest and desapping practices affect mango fruit quality along the supply chains

This study was aimed at evaluating the impact of improved harvest and handling practices including careful fruit harvesting along with 4-6 inches long pedicels, de-stemming and de-sapping in 0.5% lime solution, 2-3 min dip and washing in tap water, on the fruit quality of mango along domestic supply chains in Pakistan compared with traditional harvest and handling system prevailing in local mango industry. Six domestic supply chains in two mango cultivars Sindhri and Samar Bahisht Chaunsa were monitored in this regard. The impact assessments were made on the basis of performance against sap burn, skin browning, lenticels spots, rots and physical damage. The effect on fruit skin color and firmness was also studied. Significant interaction of skin browning, sapburn injury, rots and physical damage was found with the practices adopted at farm level. These problems were found to start from farm (origin) and significantly increase along the supply chains depending upon the procedures adopted for produce harvest and handling. The fruits passed through improved practice had significantly better quality at retail with less skin browning (39.17% in improved vs 58.33% in traditional), low sap burn damage (15.83% vs 73.34%), smaller extent of rots (22.50% vs 68.33%) and physical damages (14.17% vs 34.17%). Non significant differences were found among the analyzed practices regarding fruit skin color, firmness and lenticel spots. Overall, the improved harvest and lime desapping technology showed potential as a best practice for the better management of mango fruit quality along the domestic supply chains. © 2011 Friends Science Publishers

Synthesis, Characterization and Biological Activity of Dimethyltin Dicarboxylates Containing Germanium

A series of diorganotin dicarboxylates of the general formula (CH3)2Sn(OCOCHR3CHR2GeR1)2 where R1=(C6H5)3, (P-CH3C6H4)3, N(CH2CH2O)3, R2=C6H5, H, CH3, P-CH3OC6H4, P-ClC6H4, P-CH3C6H4, R3=CH3 and H, have been synthesized by the reaction of dimethyltin oxide with germanium substituted propionic acid in 1:2 molar ratio in toluene. The H2O formed was removed azeotropically using a Dean and Stark apparatus. All the compounds have been characterized by IR, multinuclear (1H, 13C, 119Sn) NMR, mass and Mössbauer spectroscopies. All compounds were found to have potential activity against bacteria

Wind Energy Potential at Badin and Pasni Costal Line of Pakistan

Unfortunately, Pakistan is facing an acute energy crisis since the past decade due to the increasing population growth and is heavily dependent on imports of fossil fuels. The shortage of the electricity is 14-18 hours in rural areas and 8-10 hours in urban areas. This situation has been significantly affecting the residential, industrial and commercial sectors in the country. At this time, it is immense challenges for the government to keep the power supply provision continue in the future for the country. In this situation, it has been the increased research to explore renewable energy resources in the country to fulfill the deficit scenario in the state. The renewable energy sector has not penetrated in the energy mix, currently in the upcoming markets. This paper highlights the steps taken by the country in the past and is taking steps at the present time to get rid of from the existing energy crisis when most urban areas are suffering from power outages for 12 hours on regular basis. Until 2009, no single grid interconnected wind established, but now the circumstances are changing significantly and wind farms are contributing to the national grid is the reality now. The initiation of the three wind farms interconnection network and many others in the pipeline are going to be operational soon. The federal policy on wind energy system has recently changed. Surprisingly, the continuing schemes of the wind farm are getting slow. This paper reviews developments in the wind energy sector in the country and lists some suggestions that can contribute to improving the penetration of wind energy in the national energy sector.Article History: Received Dec 16th 2016; Received in revised form May 15th 2017; Accepted June 18th 2017; Available onlineHow to Cite This Article: Kaloi,G.S., Wang, J., Baloch, M.H and Tahir, S. (2017) Wind Energy Potential at Badin and Pasni Costal Line Pakistan. Int. Journal of Renewable Energy Development, 6(2), 103-110.https://doi.org/10.14710/ijred.6.2.103-11

A Study of nature of the Photovoltaic modules under the influence of partial shading effect

The behaviour of the solar photovoltaic array will be rapidly changing under the influence of partial shading phenomenon. When two (or) more photovoltaic modules are embedded in series, then the total output voltage and the net output power obtained from the series connected photovoltaic modules will mainly depends upon the solar insolation which is being projected upon each and every module respectively. Small perturbation in solar irradiation levels will lead to large considerable change in the output parameters. This paper mainly focuses on observing the effect of partial shading on photovoltaic modules which are connected in series. The main objective of this paper is to examine about the mismatching phenomenon that occurs while tracking the global maxima point which plays a vital role in extracting maximum power from solar photovoltaic array in an effective manner