Distributed Apportioning in a Power Network for providing Demand Response Services

Greater penetration of Distributed Energy Resources (DERs) in power networks requires coordination strategies that allow for self-adjustment of contributions in a network of DERs, owing to variability in generation and demand. In this article, a distributed scheme is proposed that enables a DER in a network to arrive at viable power reference commands that satisfies the DERs local constraints on its generation and loads it has to service, while, the aggregated behavior of multiple DERs in the network and their respective loads meet the ancillary services demanded by the grid. The Net-load Management system for a single unit is referred to as the Local Inverter System (LIS) in this article . A distinguishing feature of the proposed consensus based solution is the distributed finite time termination of the algorithm that allows each LIS unit in the network to determine power reference commands in the presence of communication delays in a distributed manner. The proposed scheme allows prioritization of Renewable Energy Sources (RES) in the network and also enables auto-adjustment of contributions from LIS units with lower priority resources (non-RES). The methods are validated using hardware-in-the-loop simulations with Raspberry PI devices as distributed control units, implementing the proposed distributed algorithm and responsible for determining and dispatching realtime power reference commands to simulated power electronics interface emulating LIS units for demand response.Comment: 7 pages, 11 Figures, IEEE International Conference on Smart Grid Communication

Effect of Sintering Temperature on Structural and PiezoelectricProperties of PNN-PZT Ceramics

Sintering temperatures affect the structural and piezoelectric properties of PbNi1/3Nb2/3-PbZrO3-PbTiO3 system considerably; therefore the effect has been studied on mechano-chemicallyprocessed powder. This process involves activating mixed oxides of PbO, NiO, Nb2O5, ZrO2 andTiO2, and in the present study, calcination steps at an intermediate temperatures were skippedwhich are usually required in conventional solid state reaction methods and chemical routes.Single-phase formation was confirmed from XRD patterns which shows rhombohedral structureat higher sintering temperature. Investigations of the microstructure indicate almost linear increasein grain size from 0.98 m to 2.56  m when the sintering temperature was varied from 1050 oC to1150 °C. A high value of planar coupling factor (kp) = 67 per cent and piezoelectric charge coefficient(d 33 ~ 750 pm/V; (as determined from strain versus electric field curve at low field) were obtainedfor the ceramic specimens sintered at 1100 °C. The maximum strain was observed ~ 0.21 per centat 40 kV/cm applied field for the sample sintered at 1100 °C for 4 h

ABHRAKA BHASMA A BOON OF AYURVEDA TO MANKIND: A REVIEW

Abhraka bhasma is a popular Rasashastra medicine in Ayurveda stream. It is basically herbomineral preparation used by all Ayurvedic Vaidyas since long time. Abhraka is basically Mica (Biotite). Bhasma is nothing but incinerated ash. Rasashastra is an Indian metallurgy which deals with several minerals and herbomineral preparations specially Bhasmas. There are several popular bhasmas in Ayurveda but there is great demand of this Bhasma in Ayurvedic vaidyas. Use of this bhasma is in multiple disorders, so could be consider as a major Ayurvedic drug. Published details scientific literature on Abhraka bhasma by various research scholars, internet & pharmacopeias were reviewed. The review was done to find physicochemical characteristics as well as standardization studies done on Abhraka bhasma. Also attempt is to made to find scientific studies done on Abhraka bhasma. Need of hour to evaluate   its efficacy value as potential Ayurvedic drug in various disorders. As well as importance of Abhraka bhasma as an evidence-based drug. Review of literatures and scientific studies of Abhraka bhasma clearly indicate that there are lot of studies is done on Abhraka bhasma’s specially it’s physicochemical characteristics, standardization as well as it’s therapeutic uses. Abhraka bhasma is indicated in several ailments like Diabetes, Asthma, Paralysis, Neurological condition, Tuberculosis and Acid peptic diseases

REVIEW ON POTENTIAL ANTIDIABETIC DRUGS IN AYURVEDA

Ayurvedic texts are mentioned this Vedic sastra as a science of life. Ayurveda mainly targeted lifestyle of human being as well as mentioned number of drugs on various disorders. Among these disorders, diabetes is a major disorder. Due to which people are suffering lot. Diabetes is a major metabolic as well as lifestyle related disease. Anti-diabetic drugs from modern science can treat this disorder but at the cost of heavy side effects. Diabetic patients are using the modern drugs at higher doses plus these drugs are much costlier. Need of today’s era is to use alternate therapies for diabetes. Among all alternative therapies Ayurveda gives ray of hope by using the Anti-diabetic drugs as mentioned in ancient texts. Ayurveda uses many drugs for diabetes especially herbal and herbomineral preparations. The review paper focuses on various Ayurvedic drugs herbal, herbomineral either in single or compound preparations studied at several research organizations. The paper focuses on antidiabetic properties of Ayurvedic drugs mentioned in Ayurvedic texts as well as their pharmacological, phytochemical properties and their scientific studies

AN OVERVIEW OF SHATAVARI (ASPARAGUS RACEMOSUS) AN AYURVEDIC DRUG

Shatavari, Asparagus racemosus is one of the most important herbal drugs used by Ayurvedic Vaidyas since ancient days. The drug is having wide range of therapeutic activity and mentioned as a Rasayan by ancient Ayurvedic texts. The main part used by Ayurvedic doctors is a root. It is mentioned as a tonic and having lactogenic function. Shatavari has also been successfully used by several Ayurvedic practitioners for Nervine disorders, Acid peptic diseases, certain infectious diseases and as a immunomodulant. Main use of this drug is in female disorders specially as a galactagogue and several menstrual disorders. Scientific fraternity is working on this drug at multidimensional level to prove this drug as a potent medicinal drug in multiple disorders. Various scientific studies are proved that this drug worked as a potent antitussive, antineoplastic, galactologue, antidiarroheal, and as immunomodulant. The main focus of this article is to review the scientific studies done on A.racemsosus mainly on its phytochemistry, pharmacology, therapeutic uses mentioned in both modern sciences as well as in ancient Ayurvedic texts. Additional attempt is made to find the clinical studies done on A.racemosus. The present review article includes the detailed scientific exploration of root extract of A.racemsosus in systematic way so that it can highlight future research prospects of this famous and commercially useful drug

Correlation between magnetic resonance imaging and arthroscopy in internal derangement of knee

Background: Ligament injuries apart from fractures are more common in the knee joint owing to its complex anatomy. They account for a large number of referrals to our hospital, both from the general practitioner and from the accident and emergency department. Although there have been studies in literature comparing MRI with arthroscopy, the continuing improvement in diagnostic methods now available makes it especially important to compare the results and recommendations offered in the literature.Methods: The aim of this study was to find out the diagnostic accuracy of MRI scans and to examine the value of MRI as a standard preoperative examination correlating them with the gold standard of arthroscopy. This is a prospective study involving 57 patients who were admitted in Department of Orthopaedics, Mahatma Gandhi Medical College and Research Institute, with the history of injury to the knee and diagnosed to have internal derangement of the knee clinically, using standardized clinical tests. MRI of the affected knee joint was done for all these patients either before or after admission. The patients were then subjected to diagnostic and therapeutic arthroscopy.Results: The sensitivity of MRI in comparison with Arthroscopy was 100% in all studied lesions. The specificity of MRI in comparison with Arthroscopy was 94.1%, 98.1%, 100% and 97.6% for ACL, PCL, Medial meniscus and Lateral meniscus respectively.Conclusions: According to our study MRI is a very good at determining the normal anatomy of the intra articular structures of the knee joint and is highly reliable in excluding pathology, in our case tear in ligaments. Hence we recommend MRI in doubtful cases of internal derangement of the knee joint whereby unnecessary diagnostic arthroscopy can be avoided which can significantly bring down the economic burden among rural population