Journal articles on the topic 'Frequency response services'
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Greenwood, D. M., K. Y. Lim, C. Patsios, P. F. Lyons, Y. S. Lim, and P. C. Taylor. "Frequency response services designed for energy storage." Applied Energy 203 (October 2017): 115–27. http://dx.doi.org/10.1016/j.apenergy.2017.06.046.
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Motalleb, Mahdi, Matsu Thornton, Ehsan Reihani, and Reza Ghorbani. "Providing frequency regulation reserve services using demand response scheduling." Energy Conversion and Management 124 (September 2016): 439–52. http://dx.doi.org/10.1016/j.enconman.2016.07.049.
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Badesa, Luis, Fei Teng, and Goran Strbac. "Optimal Portfolio of Distinct Frequency Response Services in Low-Inertia Systems." IEEE Transactions on Power Systems 35, no. 6 (November 2020): 4459–69. http://dx.doi.org/10.1109/tpwrs.2020.2997194.
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Clarke, Thomas, Tylor Slay, Conrad Eustis, and Robert B. Bass. "Aggregation of Residential Water Heaters for Peak Shifting and Frequency Response Services." IEEE Open Access Journal of Power and Energy 7 (2020): 22–30. http://dx.doi.org/10.1109/oajpe.2019.2952804.
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Trovato, Vincenzo, Agnes Bialecki, and Anes Dallagi. "Unit Commitment With Inertia-Dependent and Multispeed Allocation of Frequency Response Services." IEEE Transactions on Power Systems 34, no. 2 (March 2019): 1537–48. http://dx.doi.org/10.1109/tpwrs.2018.2870493.
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Gundogdu, Burcu, Daniel Gladwin, and David Stone. "Battery energy management strategies for UK firm frequency response services and energy arbitrage." Journal of Engineering 2019, no. 17 (June 1, 2019): 4152–57. http://dx.doi.org/10.1049/joe.2018.8226.
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Christensen, Dale B., Nancy Neil, William E. Fassett, David H. Smith, Garth Holmes, and Andy Stergachis. "Frequency and Characteristics of Cognitive Services Provided in Response to a Financial Incentive." Journal of the American Pharmaceutical Association (1996) 40, no. 5 (September 2000): 609–17. http://dx.doi.org/10.1016/s1086-5802(16)31100-7.
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Karpana, Sivakrishna, Efstratios Batzelis, Suman Maiti, and Chandan Chakraborty. "PV-Supercapacitor Cascaded Topology for Primary Frequency Responses and Dynamic Inertia Emulation." Energies 14, no. 24 (December 10, 2021): 8347. http://dx.doi.org/10.3390/en14248347.
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Owing to rapid increase in PV penetration without inherent inertia, there has been an unremitting deterioration of the effective inertia of the existing power systems. This may pose a serious threat to the stability of power systems during disturbances if not taken care of. Hence, the problem of how to emulate Synthetic Inertia (SI) in PV Systems (PVS) to retain their frequency stability demands attention. Super Capacitor (SC)-based storage become an attractive option over the other energy storage types because of its high-power density, burst power handling capability, faster response and longer life cycle. Considering this, the authors here propose a novel PV-SC Cascaded Topology (PSCT) as a cost-effective approach to emulate SI by integrating a low voltage SC to a high voltage grid-connected PVS. The proposed PSCT helps in operating the SC as a voltage source rather than a current source. Thus, it eliminates the high gain requirements of the SC interfacing converters. The aim is to target two main frequency response services, i.e., Primary Frequency Response (PFR) and Synthetic Inertial Response (SIR), using a novel common control scheme, but without affecting any other energy intensive services. The authors introduced a Droop-Inspired (DI) method with an adjustable inertia constant to emulate dynamic inertia so that a wider range of Rate of Change of Frequency (RoCoF) values can be serviced with a limited storage. A very streamlined analysis was also carried out for sizing of the SC stage based on a simple Three-Point Linearization (TPL) technique and DI technique with a limited knowledge of the disturbance parameters. The whole system was initially validated in a MATLAB Simulink environment and later confirmed with the OPAL-RT Real-Time Simulator. The investigated response was subject to variation in terms of control parameters, changes in solar irradiance, grid frequency variation, etc.
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Stein, Karl, Moe Tun, Marc Matsuura, and Richard Rocheleau. "Characterization of a Fast Battery Energy Storage System for Primary Frequency Response." Energies 11, no. 12 (December 1, 2018): 3358. http://dx.doi.org/10.3390/en11123358.
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In response to increasing integration of renewable energy sources on electric grid systems, battery energy storage systems (BESSs) are being deployed world-wide to provide grid services, including fast frequency regulation. Without mitigating technologies, such as BESSs, highly variable renewables can cause operational and reliability problems on isolated grids. Prior to the deployment of a BESS, an electric utility company will typically perform modeling to estimate cost benefits and determine grid impacts. While there may be a comparison of grid operations before and after BESS installation, passive monitoring typically does not provide information needed to tune the BESS such that the desired services are maintained, while also minimizing the cycling of the BESS. This paper presents the results of testing from a live grid using a method that systematically characterizes the performance of a BESS. The method is sensitive enough to discern how changes in tuning parameters effect both grid service and the cycling of the BESS. This paper discusses the application of this methodology to a 1 MW BESS regulating the entire island of Hawaii (180 MW peak load) in-situ. Significant mitigation of renewable volatility was demonstrated while minimizing BESS cycling.
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Shehzad, Sofia. "EMERGENCY RESPONSE SERVICES IN PESHAWAR." Journal of Gandhara Medical and Dental Science 1, no. 2 (October 20, 2015): 1. http://dx.doi.org/10.37762/jgmds.1-2.232.
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The recent terror attacks on Army Public School and Imam Bargah in Hayatabad, Peshawar once again highlighted the continuing fragile law and order situation that the country is facing in general and the province of KPK in particular. The civilian emergency response mounted to these events and those of a similar nature in the past can at best be described as grossly insufficient and well below the desired standards.
Having been at the heart of ‘war on terror”, and faced with numerous bomb blasts and other forms of militant activities over successive years in the recent past, one would expect a mature and systematic approach inculcated in the country’s response to emergency. Sadly this has not been the case and the same chaos and indifference by the concerned authorities is seen at the site of occurrence, during transportation and in the hospitals as was the case before these events were a regular feature. To add to the spectrum of these woes is the lack of any coordinated efforts to rehabilitate the victims either psychologically, physically or financially.
As I searched for an effective system globally adopted for disaster management of various scales, I came across the existence of various national and international organizations tasked to ensure preparedness and swift response in event of any such eventualities. International organizations such as Red Cross, The International Emergency Management Society (TIEMS), The International Recovery Platform (IRP) and United nations organization help reduce vulnerability and assist cope with natural disasters such as floods and earthquakes, industrial sabotage and other incidences of significant humanitarian crisis. While some of these organizations may help creating awareness and offer technical guidance in managing manmade disasters, they have a very limited role in practically addressing incidents related to localize events of terrorism. This responsibility is borne by respective governments in light of the prevailing law and order situation and resource availability. Different countries then have other umbrella organizations overlooking management of emergency situations arising from terror related disasters in addition to natural calamities eg the Civil Contingencies secretariat in UK, the Federal emergency management authority in US and the National disaster response force in India.
In Pakistan unfortunately there is no concept of an organized response to events resulting in multiple or mass casualties, be it a result of any major accident or an act of terrorism. Organizations such as APDMA and PDMA have limited roles dealing mainly with natural disasters. Need of the hour is for an organization or team to cater for manmade disasters given the recent frequency of these events. In the absence of any responsible organization taking the lead and developing protocols as well as providing guidelines, the workforce available for pre hospital and hospital-based critical care varies enormously.
Every major city of the country and specially Peshawar should have a disaster control management plan involving security agencies, paramedic and ambulance services and all major hospitals who should develop an effective strategy to facilitate management of injured patients.
An effective approach would depend on the ability of the concerned team to anticipate, assess, prevent, prepare, respond and recover from an incident. Security agencies must cordon off the site of incident allowing only emergency vehicles and personnel to approach the site once secured. The hospital nominated to receive the brunt of casualties should be informed well in time for emergency preparedness. If possible all unnecessary traffic flow in the vicinity of the hospital should be diverted according to a predetermined plan.
The Accident and Emergency departments should have a viable communication system of summoning their trauma team and any additional staff needed according to the nature and magnitude of the calamity on a very short notice. Within the hospital all visitors and well wishers as well as media personnel and politicians should be restricted to nominated zones with facilities of a public address system and an information centre updating the list of injured and dead at regular intervals. A spacious TRIAGE hall with designated triage officers (doctors or nurses) should be at hand to sort out the patients and prioritize their treatment according to the nature of their injuries and resources available. The major hospitals must build up their capacity in terms of skilled manpower and equipment/medicine and be ready for any major incident in its catchment area besides being able to receive a spill over in case of any major disaster in adjoining vicinities. Doctors and other support staff in ER should be familiar with the basic principles of Emergency life saving measures. It should be mandatory for the aforementioned to have attended trauma management courses such as Advanced Trauma Life Support, Primary Trauma Care or Emergency Room Trauma Care. There is considerable evidence to show that properly trained staff can make a marked difference when it comes to saving precious lives. There should also be appropriate arrangement for dealing with bodies of dead victims and counseling their near and dear ones.
No doubt, considerable effort and commitment is needed if the above goals have to be achieved. To ensure a well organized and coherent response to any major incident there has to be a lead body running the show. All those involved in emergency management from the scene of the incident to the hospital receiving and managing the injured patients should be part of a team and should be allowed to interact on a regular basis through seminars and conferences framing and developing their own standard operating procedures and guidelines. Effective emergency management has been and will always be the crunch requirement of any civilized society and it is imperative that the government should take practical steps in addressing this issue in the best interest of the public.
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Al Kez, Dlzar, Aoife M. Foley, Faraedoon W. Ahmed, Mark O'Malley, and S. M. Muyeen. "Potential of data centers for fast frequency response services in synchronously isolated power systems." Renewable and Sustainable Energy Reviews 151 (November 2021): 111547. http://dx.doi.org/10.1016/j.rser.2021.111547.
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Makhkamova, Ozoda, and Doohyun Kim. "A Conversation History-Based Q&A Cache Mechanism for Multi-Layered Chatbot Services." Applied Sciences 11, no. 21 (October 25, 2021): 9981. http://dx.doi.org/10.3390/app11219981.
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Chatbot technologies have made our lives easier. To create a chatbot with high intelligence, a significant amount of knowledge processing is required. However, this can slow down the reaction time; hence, a mechanism to enable a quick response is needed. This paper proposes a cache mechanism to improve the response time of the chatbot service; while the cache in CPU utilizes the locality of references within binary code executions, our cache mechanism for chatbots uses the frequency and relevance information which potentially exists within the set of Q&A pairs. The proposed idea is to enable the broker in a multi-layered structure to analyze and store the keyword-wise relevance of the set of Q&A pairs from chatbots. In addition, the cache mechanism accumulates the frequency of the input questions by monitoring the conversation history. When a cache miss occurs, the broker selects a chatbot according to the frequency and relevance, and then delivers the query to the selected chatbot to obtain a response for answer. This mechanism showed a significant increase in the cache hit ratio as well as an improvement in the average response time.
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Sanchez, Francisco, Joshua Cayenne, Francisco Gonzalez-Longatt, and José Luis Rueda. "Controller to enable the enhanced frequency response services from a multi-electrical energy storage system." IET Generation, Transmission & Distribution 13, no. 2 (January 22, 2019): 258–65. http://dx.doi.org/10.1049/iet-gtd.2018.5931.
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SULISTIAWATI, ASRI. "Agricultural Short Message Services as Information for Farmer Empowerment." Jurnal Komunikasi Pembangunan 19, no. 01 (April 26, 2021): 62–72. http://dx.doi.org/10.46937/19202134076.
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Layanan Informasi Desa/Rural Information Service (LISA) is an information service for farmers based on SMS. It is used to disseminate agricultural information and provide a space for agricultural tips, ask questions and have a discussion. This study was conducted to determine the response and the perceived benefits of these services for farmer households. The study was conducted in Karawang, where LISA was launched. The results showed that the frequency of LISA’S use varied greatly from once per week to 30 times per week, but no farmer household used Android-based applications. The frequency of use of these services is significantly related to satisfaction level and is associated with the level of knowledge of farmer households. On the other hand, the frequency of use of LISA is unrelated to the characteristics of farmer households, which include age, education, sex, land ownership, as well as participation in farmer groups, and cosmopolitanism. A higher level of knowledge is also related to the suitability of the tips given by LISA and the degree of satisfaction with the LISA.
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Martins, Andréa Maria Eleutério de Barros Lima, Lorena Amaral Jardim, João Gabriel Silva Souza, Carlos Alberto Quintão Rodrigues, Raquel Conceição Ferreira, and Isabela Almeida Pordeus. "Is the negative evaluation of dental services among the Brazilian elderly population associated with the type of service?" Revista Brasileira de Epidemiologia 17, no. 1 (March 2014): 71–90. http://dx.doi.org/10.1590/1415-790x201400010007eng.
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This study aimed at identifying the prevalence of the negative evaluation of dental services among elderly Brazilians and at investigating whether the prevalence was higher among those using public or philanthropic provider services than among those paying privately or using private health plans. Additionally, factors associated with this negative assessment were identified. Interview and survey data were collected in the residences of participants by trained and calibrated examiners as part of a national epidemiological survey of oral health conditions of the Brazilian population in 2002/2003. The dependent variable was obtained in response to questions regarding whether the participant had ever used dental services, the frequency of use, and the quality of this service. Potential responses to the questions regarding the quality of service were very poor or poor, fair, and good or very good. The main independent variable was the system of health care used with potential responses being health plan or private, public, and philanthropic services. We conducted univariate (linear tendency χ2test) and multiple descriptive analyses, and the partial proportional Odds model for ordinal logistic regression. Among the elderly, 196 (3.7%) evaluated the provided services negatively (very poor or poor). Participants with the following responses were more likely to evaluate the services negatively: those who had used public or philanthropic services, men, those with higher education, the ones who had not received information about preventing dental problems, those who perceived pain in their teeth and gums in the last six months, and those who self-reported their oral health and speech was poor. In conclusion, elderly Brazilian users of public and philanthropic services were more likely than users of private or insurance-based plans to evaluate their dental services negatively, regardless of the other investigated variables.
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Mantar Gundogdu, Burcu, Dan T. Gladwin, Shahab Nejad, and David Andrew Stone. "Scheduling of grid-tied battery energy storage system participating in frequency response services and energy arbitrage." IET Generation, Transmission & Distribution 13, no. 14 (July 23, 2019): 2930–41. http://dx.doi.org/10.1049/iet-gtd.2018.6690.
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Clemency, Brian, Christian Martin-Gill, Nicole Rall, Dipesh Patel, and Jeffery Myers. "US Emergency Medical Services Fellows." Prehospital and Disaster Medicine 33, no. 3 (April 18, 2018): 339–41. http://dx.doi.org/10.1017/s1049023x18000249.
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AbstractIntroductionThe 2015-2016 academic year was the fourth year since the Accreditation Council for Graduate Medical Education (ACGME; Chicago, Illinois USA) accredited Emergency Medical Services (EMS) fellowships, and the first year an in-training examination was given. Soon, ACGME-accredited fellowship education will be the sole path to EMS board certification when the practice pathway closes after 2019. This project aimed to describe the current class of EMS fellows at ACGME-accredited programs and their current educational opportunities to better understand current and future needs in EMS fellowship education.MethodsThis was a cross-sectional survey of EMS fellows in ACGME-accredited programs in conjunction with the first EMS In-Training Examination (EMSITE) between April and June 2016. Fellows completed a 14-question survey composed of multiple-choice and free-response questions. Basic frequency statistics were performed on their responses.ResultsFifty fellows from 35 ACGME-accredited programs completed the survey. The response rate was 100%. Forty-eight (96%) fellows reported previous training in emergency medicine. Twenty (40%) were undergoing fellowship training at the same institution as their prior residency training. Twenty-five (50%) fellows performed direct patient care aboard a helicopter during their fellowship. Thirty-three (66%) fellows had a dedicated physician response vehicle for fellows. All fellows reported using the National Association of EMS Physicians (NAEMSP; Overland Park, Kansas USA) textbooks as their primary reference. Fellows felt most prepared for the Clinical Aspects questions and least prepared for Quality Management and Research questions on the board exam.ConclusionThese data provide insight into the characteristics of EMS fellows in ACGME-accredited programs.ClemencyB, Martin-GillC, RallN, PatelD, MyersJ. US Emergency Medical Services fellows. Prehosp Disaster Med. 2018;33(3):339–341.
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Nahid Osman Ahmed, Mahfoudh A. M. Abdulghani, Sarah Fahad Alrebdi, and Mohammed Faez Baobaid. "PERCEPTIONS OF PHYSICIANS ABOUT CLINICAL PHARMACIST’S ROLE IN AL QASSIM’S HOSPITALS IN SAUDI ARABIA." Malaysian Journal of Public Health Medicine 17, no. 3 (December 31, 2017): 109–16. http://dx.doi.org/10.37268/mjphm/vol.17/no.3/art.220.
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The objective of this study is to explore physician’s perception toward clinical pharmacy services and role of clinical pharmacists in governmental hospitals at Al-Qassim region. An observational cross-sectional survey was conducted. Results: 150 males and 39 females participated giving 75.5% (189 of 250) response rate. Physicians perceptions were found to be high (equal or more than 90% of frequency) in some clinical pharmacy services such as patients’ education and counselling, monitoring of patients’ responses to drug therapy including toxicity/side effects and provision of drug information to healthcare professionals. The physicians showed low perception (less than 76%) in the taking of patients’ medication history on admission, by clinical pharmacists. Conclusion: Physicians’ perception toward clinical pharmacy services and the role of clinical pharmacists was not found to be completely favourable. The reason of this mixed responses and to the accommodating feelings of clinical pharmacy services in clinical setting appear to relate to the state of infrastructure and environments of hospitals. The infrastructure and environments of hospitals need to be updated for an improved accommodation clinical pharmacy services.
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Wagner, Ingrid, Stephen Stathis, Scott Harden, and Jennifer Crimmins. "Models and Patterns of Service in Child and Youth Consultation–Liaison Services." Australasian Psychiatry 13, no. 3 (September 2005): 273–78. http://dx.doi.org/10.1080/j.1440-1665.2005.02201.x.
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Objective: The aim was to examine referral pathways to child and youth consultation–liaison (C-L) services to identify patterns associated with demographic characteristics of patients, referral sources, the presenting problem and models of service. Method: A case record review with a cross-sectional design. Data were extracted from the records of all patients referred to the C-L service for a 3month period. Results: Adolescents were more likely to accessmental health services through informal liaison services. Medical specialty areas that were inclusive of nursing and allied health, in both the request for service and initial response to the request, had higher frequencies of referral. There was no difference between the disciplines of medicine and social work in the frequency of referrals. However, medicine, social work and nursing differed in the number of staff who initiated the request for consultation, and the types of problems that were presented as reasons for referral. Conclusions: Inclusive multidisciplinary models may facilitate the development of service relationships in paediatric hospital settings, due to the stability of staffing arrangements. The wider participation of allied health and nursing staff within paediatric hospitals may extend opportunities for the identification of mental health problems and enhance timely management of referrals.
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Considine, Julie, Anastasia F. Hutchison, Helen Rawson, Alison M. Hutchinson, Tracey Bucknall, Trisha Dunning, Mari Botti, Maxine M. Duke, and Maryann Street. "Comparison of policies for recognising and responding to clinical deterioration across five Victorian health services." Australian Health Review 42, no. 4 (2018): 412. http://dx.doi.org/10.1071/ah16265.
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Objectives The aim of the present study was to describe and compare organisational guidance documents related to recognising and responding to clinical deterioration across five health services in Victoria, Australia. Methods Guidance documents were obtained from five health services, comprising 13 acute care hospitals, eight subacute care hospitals and approximately 5500 beds. Analysis was guided by a specific policy analysis framework and a priori themes. Results In all, 22 guidance documents and five graphic observation and response charts were reviewed. Variation was observed in terminology, content and recommendations between the health services. Most health services’ definitions of physiological observations fulfilled national standards in terms of minimum parameters and frequency of assessment. All health services had three-tier rapid response systems (RRS) in place at both acute and subacute care sites, consisting of activation criteria and an expected response. RRS activation criteria varied between sites, with all sites requiring modifications to RRS activation criteria to be made by medical staff. All sites had processes for patient and family escalation of care. Conclusions Current guidance documents related to the frequency of observations and escalation of care omit the vital role of nurses in these processes. Inconsistencies between health services may lead to confusion in a mobile workforce and may reduce system dependability. What is known about the topic? Recognising and responding to clinical deterioration is a major patient safety priority. To comply with national standards, health services must have systems in place for recognising and responding to clinical deterioration. What does this paper add? There is some variability in terminology, definitions and specifications of physiological observations and medical emergency team (MET) activation criteria between health services. Although nurses are largely responsible for physiological observations and escalation of care, they have little authority to direct frequency of observations and triggers for care escalation or tailor assessment to individual patient needs. Failure to identify nurses’ role in policy is concerning and contrary to the evidence regarding nurses and MET activations in practice. What are the implications for practitioners? Inconsistencies in recommendations regarding physiological observations and escalation of care criteria may create patient safety issues when students and staff work across organisations or move from one organisation to another. The validity of other parameters, such as appearance, pain, skin colour and cognition, warrant further consideration as early indicators of deterioration that may be used by nurses to identify clinical deterioration earlier. A better understanding of the relationship between the sensitivity, specificity and frequency of monitoring of particular physiological observations and patient outcomes is needed to improve the predictive validity for identification of clinical deterioration.
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Radaelli, Lucio, and Sergio Martinez. "Frequency Stability Analysis of a Low Inertia Power System with Interactions among Power Electronics Interfaced Generators with Frequency Response Capabilities." Applied Sciences 12, no. 21 (November 2, 2022): 11126. http://dx.doi.org/10.3390/app122111126.
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One of the main actions required to face and limit global warming is the substitution of conventional fossil-fueled electrical generators with renewable ones. Thus, it becomes fundamental to create non-dispatchable renewable generators able to provide services for power system stabilization that nowadays are delivered by conventional ones. Particularly, renewable generators are usually connected to the electrical power system through power electronic converters lacking natural responses to frequency variations. This challenges conventional frequency control methods that are based on synchronous generators’ capabilities, particularly in systems with high levels of non-synchronous generation. Solutions based on advanced controls that allow renewable generators to participate in frequency control are the subject of current research efforts worldwide. This paper contributes to these efforts by studying the benefits of introducing Power Reserve Control in photovoltaic generators and Extended Optimal Power Point Tracking control in wind generators to provide frequency control in low inertia power systems and the interactions between them. The tests and the simulations, prove that these kinds of controls help in stabilizing the system frequency thanks to the cooperative action of both types of renewable generators.
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Flynn, Andrew. "Maximizing resource efficiency in rural prehospital emergency medical services through call frequency analysis." UNED Research Journal 5, no. 2 (November 20, 2013): 297–301. http://dx.doi.org/10.22458/urj.v5i2.267.
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Rural prehospital emergency medical services are often lacking when compared with their urban counterparts in terms of resources and coordinated resource use: can only employ important resources, such as paramedics, during limited shifts. This project demonstrates a method for determining the most effective use of these limited resources in a rural Red Cross ambulance service in Guápiles, Costa Rica. In this community, paramedic services are only available six days a week for twelve hours. Emergency call frequency was mapped using 20 months of traffic accident data and after establishing that traffic accident frequency was statistically dependent on the time of day, polynomial models of the data were generated. The model functions were integrated and the results were tested for accuracy. Integrals were calculated, and the results were reported to the Guápiles Red Cross committee to achieve an improved service. Methods such as this can be applied to any emergency response service.KEY WORDSWorld Health Organization (WHO), Prehospital Emergency Medical Service(s) (PEMS), Traffic Accident (TA), Téchnico de Emergencias Medicas (Paramedic), Advanced Life Support (ALS)
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Schneider, Justine, John Carpenter, and Toby Brandon. "Operation and organisation of services for people with severe mental illness in the UK." British Journal of Psychiatry 175, no. 5 (November 1999): 422–25. http://dx.doi.org/10.1192/bjp.175.5.422.
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BackgroundSince 1991, English mental health policy guidelines have been explicit in recommending inter-professional working, involvement of patients and carers, harmonisation between health and social services and targeting at people with severe mental illness.AimsTo explore the structure and operation of mental health services in practice and relate them to measurable data.MethodA survey of mental health trusts was conducted in 1997–1998. Responses were compared with a concurrent survey of social services departments. Some qualitative data were collected. Harmonisation and targeting scores were devised and tested for association.ResultsThe response rate was 79%. The frequency with which different professionals, patients and carers were involved in the care process is described. Reasons for this are discussed briefly. Levels of harmonisation and targeting were found to vary widely and to be positively associated.ConclusionsThis survey portrays mental health services' practice in relation to Government policy. However, adherence to guidelines cannot be taken as a guarantee of service quality or efficiency.
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Furbee, Paul M., Jeffery H. Coben, Sharon K. Smyth, William G. Manley, Daniel E. Summers, Nels D. Sanddal, Teri L. Sanddal, et al. "Realities of Rural Emergency Medical Services Disaster Preparedness." Prehospital and Disaster Medicine 21, no. 2 (April 2006): 64–70. http://dx.doi.org/10.1017/s1049023x0000337x.
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AbstractIntroduction:Disaster preparedness is an area of major concern for the medical community that has been reinforced by recent world events. The emergency healthcare system must respond to all types of disasters, whether the incidents occur in urban or rural settings. Although the barriers and challenges are different in the rural setting, common areas of preparedness must be explored.Problem:This study sought to answer several questions, including: (1) What are rural emergency medical services (EMS) organizations training for, compared to what they actually have seen during the last two years?; (2) What scale and types of events do they believe they are prepared to cope with?; and (3) What do they feel are priority areas for training and preparedness?Methods:Data were gathered through a multi-region survey of 1,801 EMS organizations in the US to describe EMS response experiences during specific incidents as well as the frequency with which these events occur. Respondents were asked a number of questions about local priorities.Results:A total of 768 completed surveys were returned (43%). Over the past few years, training for commonly occurring types of crises and emergencies has declined in favor of terrorism preparedness. Many rural EMS organizations reported that events with 10 or fewer victims would overload them. Low priority was placed on interacting with other non-EMS disaster response agencies, and high priority was placed on basic staff training and retention.Conclusion:Maintaining viable, rural, emergency response capabilities and developing a community-wide response to natural or man-made events is crucial to mitigate long-term effects of disasters on a local healthcare system. The assessment of preparedness activities accomplished in this study will help to identify common themes to better prioritize preparedness activities and maximize the response capabilities of an EMS organization.
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Beltran, Hector, Sam Harrison, Agustí Egea-Àlvarez, and Lie Xu. "Techno-Economic Assessment of Energy Storage Technologies for Inertia Response and Frequency Support from Wind Farms." Energies 13, no. 13 (July 2, 2020): 3421. http://dx.doi.org/10.3390/en13133421.
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This paper provides the result of a techno-economic study of potential energy storage technologies deployable at wind farms to provide short-term ancillary services such as inertia response and frequency support. Two different scenarios are considered including a single energy storage system for the whole wind farm and individual energy storage for each wind turbine (located at either the dc or the ac side of its grid-side converter). Simulations are introduced to check the technical viability of the proposal with different control strategies. Power and energy capability requirements demanded by both specific services are defined for each studied case based on present and future grid code needs. Based on these requirements, the study compares a wide range of energy storage technologies in terms of present-day technical readiness and properties and identifies potential candidate solutions. These are flywheels, supercapacitors, and three chemistries out of the Li-ion battery family. Finally, the results of a techno-economic assessment (mainly based on weight, volume, lifetime, and industry-confirmed costings) detail the advantages and disadvantages of the proposed solutions for the different scenarios under consideration. The main conclusion is that none of the candidates are found to be clearly superior to the others over the whole range of scenarios. Commercially available solutions have to be tailored to the different requirements depending on the amount of inertia, maximum Rate of Change of Frequency and maximum frequency deviation to be allowed.
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Alhelou, Hassan Haes, Pierluigi Siano, Massimo Tipaldi, Raffaele Iervolino, and Feras Mahfoud. "Primary Frequency Response Improvement in Interconnected Power Systems Using Electric Vehicle Virtual Power Plants." World Electric Vehicle Journal 11, no. 2 (May 16, 2020): 40. http://dx.doi.org/10.3390/wevj11020040.
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The smart grid concept enables demand-side management, including electric vehicles (EVs). Thus way, some ancillary services can be provided in order to improve the power system stability, reliability, and security. The high penetration level of renewable energy resources causes some problems to independent system operators, such as lack of primary reserve and active power balance problems. Nowadays, many countries are encouraging the use of EVs which provide a good chance to utilize them as a virtual power plant (VPP) in order to contribute to frequency event. This paper proposes a new control method to use EV as VPP for providing primary reserve in smart grids. The primary frequency reserve helps the power system operator to intercept the frequency decline and to improve the frequency response of the whole system. The proposed method calculates the electric vehicles’ primary reserve based on EVs’ information, such as the state of charge (SOC), the arriving time and the vehicle’s departure time. The effectiveness of the proposed scheme is verified by several simulation scenarios on a real-world modern power system with different generating units, such as conventional power plants, renewable energy resources, and electric vehicles.
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Dewhurst, R. J., and C. H. Knight. "The response to thrice-daily milking and its relationship to cisternal storage capacity in dairy cows." Proceedings of the British Society of Animal Production (1972) 1992 (March 1992): 37. http://dx.doi.org/10.1017/s0308229600021619.
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Recently there has been increased interest in the effects of changing the milking frequency of dairy cows because of the possibilities of either increased milking frequency, through the use of robot-milkers or of once-daily milking as a part of a programme of extensification. Archer (1983), reviewing the literature and data from herds monitored by Farm Management Services, found milk yield responses on changing from twice- to thrice-daily milking from -0.14 to +0.49. These differences represent large between-animal differences in responses to thrice-daily milking and there is a need to identify sources of this variation.Milk is stored in the udder in both the cistern and the secretory alveolar tissue itself. Since milk contains a protein which is inhibitory to secretion, storage within the secretory tissue is disadvantageous and reduces the efficiency of secretory tissue. Work at the Hannah Research Institute has shown that the effect of the inhibitor can be overcome by milking more frequently and that the response to thrice-daily milking of goats was greater with animals having smaller cisterns.
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Hawkins, Carrie L. "Virtual Rapid Response." AACN Advanced Critical Care 23, no. 3 (July 1, 2012): 337–40. http://dx.doi.org/10.4037/nci.0b013e31825dff69.
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The first of its kind in the Veterans Affairs (VA) system, the Denver VA Medical Center’s tele–intensive care unit (ICU) program is unique because it is entirely nurse driven. A nontraditional tele-ICU model, the program was tailored to meet the needs of rural veterans by using critical care nursing expertise in Denver, Colorado. An experienced CCRN-certified nurse manages the system 24 hours a day, 7 days a week, from Eastern Colorado Health Care System. The virtual ICU provides rapid response interventions through virtual technology. This tele-ICU technology allows for a “virtual handshake” by nursing staff at the start of the shift and a report on potential patient issues. Clinical relationships have been strengthened between all 5 VA facilities in the Rocky Mountain Region, increasing the likelihood of early consultation at the onset of clinical decline of a patient. In addition, the tele-ICU nurse is available for immediate nursing consultation and support, coordinates point-to-point virtual consultation between physicians at the rural sites and specialists in Denver, and assists in expediting critical care transfers. The primary objectives for the tele-ICU program include improving quality and access of care to critical care services in rural sites, reducing community fee basis costs and frequency of transfers, and increasing collaboration and collegiality among nursing and medical staff in all Region 19’s medical centers.
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Abraham, Suzanne, Richard Stoker, and William Allen. "Speech Assessment of Hearing-Impaired Children and Youth." Language, Speech, and Hearing Services in Schools 19, no. 1 (January 1988): 17–27. http://dx.doi.org/10.1044/0161-1461.1901.17.
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Demographic information was gathered from programs providing speech assessment services to hearing-impaired children and youth in the United States. Frequency of use scores and rankings are reported for test instruments used by at least 10% of the respondents to assess the speech of the hearing impaired at the infant, preschool, primary, and secondary educational levels. Domains tested and stimulus-response demands of the instruments are discussed in view of speech assessment needs of the hearing impaired. Information regarding the educational settings in which speech and language assessment services are provided and the current positions of employment of those providing the services is also included.
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Gupta, Vidya Bhushan, Karen G. O’Connor, and Carlos Quezada-Gomez. "Care Coordination Services in Pediatric Practices." Pediatrics 113, Supplement_4 (May 1, 2004): 1517–21. http://dx.doi.org/10.1542/peds.113.s4.1517.
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Objective. To examine the frequency with which pediatricians provide care coordination services to children, particularly those with special health care needs, in their practices and the barriers to providing these services. Methods. An 8-page questionnaire was mailed to 1632 randomly selected US members of the American Academy of Pediatrics. Results. The response rate was 56.7%. Most pediatricians (71.2%) reported that they or someone in their practice serves as the primary care coordinator for their children with special needs, but fewer than one fourth (23.3%) always contact the school about the child’s health and educational needs as part of care coordination, only 18.7% always schedule time with the child’s family to discuss the findings of a specialist, and only 23.2% meet with the discharge planning team to facilitate transition from hospital to home. The respondents identified the 2 top barriers that impede this activity: limited time and lack of medical staff in their offices. Conclusions. Although most pediatricians believe that they are providing care coordination services, when asked about specific care coordination activities, such as contacting the school or scheduling time with the family to discuss the findings of a specialist, many do not provide these services.
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Wang, Yingcheng, and Daniel Gladwin. "Power Management Analysis of a Photovoltaic and Battery Energy Storage-Based Smart Electrical Car Park Providing Ancillary Grid Services." Energies 14, no. 24 (December 14, 2021): 8433. http://dx.doi.org/10.3390/en14248433.
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Future car parks will require significant power to support electric vehicle (EV) charging as there will be both an increase in the penetration of EVs and a higher demand for charging power as battery packs increase in capacity. The effective management of the charging and local battery storage can be installed to help prevent excessive increases in electrical feeder capacity; however, it is inevitable that car parks will attain significant power capability in the future. There is therefore an opportunity for car park owners to utilise this and generate additional revenue by providing frequency response services to the electrical grid. This paper describes the modelling of a car park that utilises photovoltaic power generation, battery storage, and EV charging management strategies to provide a grid frequency response service. The analysis using simulated car park data shows that it can provide a high availability in terms of service but it is dependent on the capacity of the installed generation and storage.
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Kim, Cho-Myong, A.-Ram Jo, and Yang-Kyun Kim. "Reviews Analysis of Korean Clinics Using LDA Topic Modeling." Journal of Korean Medicine 43, no. 1 (March 1, 2022): 73–86. http://dx.doi.org/10.13048/jkm.22007.
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Objectives: In the health care industry, the influence of online reviews is growing. As medical services are provided mainly by providers, those services have been managed by hospitals and clinics. However, direct promotions of medical services by providers are legally forbidden. Due to this reason, consumers, like patients and clients, search a lot of reviews on the Internet to get any information about hospitals, treatments, prices, etc. It can be determined that online reviews indicate the quality of hospitals, and that analysis should be done for sustainable hospital marketing.Method: Using a Python-based crawler, we collected reviews, written by real patients, who had experienced Korean medicine, about more than 14,000 reviews. To extract the most representative words, reviews were divided by positive and negative; after that reviews were pre-processed to get only nouns and adjectives to get TF(Term Frequency), DF(Document Frequency), and TF-IDF(Term Frequency – Inverse Document Frequency). Finally, to get some topics about reviews, aggregations of extracted words were analyzed by using LDA(Latent Dirichlet Allocation) methods. To avoid overlap, the number of topics is set by Davis visualization.Results and Conclusions: 6 and 3 topics extracted in each positive/negative review, analyzed by LDA Topic Model. The main factors, consisting of topics were 1) Response to patients and customers. 2) Customized treatment (consultation) and management. 3) Hospital/Clinic’s environments.
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Attya, Ayman B., and Adam Vickers. "Operation and Control of a Hybrid Power Plant with the Capability of Grid Services Provision." Energies 14, no. 13 (June 30, 2021): 3928. http://dx.doi.org/10.3390/en14133928.
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The integration of distributed power plants that rely on renewable energy sources (RESs) is a major challenge for system operators (SOs) due to the variable nature of the input energy (e.g., wind and solar irradiation) to these power sources. A key solution to such a challenge is to coordinate and combine the power generation of these sources such that their behavior is closer to a conventional and dispatchable power station, taking into account the limitations imposed by the battery storage system (BESS), so it is seen as a hybrid power plant (HPP) from the SOs’ viewpoint. This paper develops a model of HPP that encompasses two generation technologies, wind and photovoltaic farms, which are assisted by a BESS. The paper proposes a comprehensive control method that can smooth the HPP output with minimized energy rejection whilst enabling the HPP to provide synthetic inertia and primary frequency response, which are grid-code compliant. The proposed control method is validated through various scenarios, which are implemented on a detailed electromechanical test system modeled in MATLAB/Simulink. The results show and quantify the achieved improvement on stabilizing the HPP capacity factor under variable wind speed. The HPP also enhances the system response to frequency events.
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Mohamed Nafis, Nur Biha, Mohamed Himdi, Mohamad Kamal A Rahim, Osman Ayop, and Raimi Dewan. "Optically Transparent Tri-Wideband Mosaic Frequency Selective Surface with Low Cross-Polarisation." Materials 15, no. 2 (January 14, 2022): 622. http://dx.doi.org/10.3390/ma15020622.
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Acquiring an optically transparent feature on the wideband frequency selective surface (FSS), particularly for smart city applications (building window and transportation services) and vehicle windows, is a challenging task. Hence, this study assessed the performance of optically transparent mosaic frequency selective surfaces (MFSS) with a conductive metallic element unit cell that integrated Koch fractal and double hexagonal loop fabricated on a polycarbonate substrate. The opaque and transparent features of the MFSS were studied. While the study on opaque MFSS revealed the advantage of having wideband responses, the study on transparent MFSS was performed to determine the optical transparency application with wideband feature. To comprehend the MFSS design, the evolutionary influence of the unit cell on the performance of MFSS was investigated and discussed thoroughly in this paper. Both the opaque and transparent MFSS yielded wideband bandstop and bandpass responses with low cross-polarisation (−37 dB), whereas the angular stability was limited to only 25°. The transparent MFSS displayed high-level transparency exceeding 70%. Both the simulated and measured performance comparison exhibited good correlation for both opaque and transparent MFSS. The proposed transparent MFSS with wideband frequency response and low cross-polarisation features signified a promising filtering potential in multiple applications.
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Masood, Bilal, Song Guobing, Jamel Nebhen, Ateeq Ur Rehman, Muhammad Naveed Iqbal, Iftikhar Rasheed, Mohit Bajaj, Muhammad Shafiq, and Habib Hamam. "Investigation and Field Measurements for Demand Side Management Control Technique of Smart Air Conditioners located at Residential, Commercial, and Industrial Sites." Energies 15, no. 7 (March 28, 2022): 2482. http://dx.doi.org/10.3390/en15072482.
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This paper investigates the response and characteristics of the narrowband power line communication (NB-PLC) technique for the effective control of electric appliances such as smart air conditioners (SACs) for demand side management (DSM) services. The expression for temperature sensitivity by examining the influence of atmospheric temperature variations on power consumption profile of all possible types of loads, i.e., residential, commercial, and industrial loads is derived and analyzed. Comprehensive field measurements on these power consumers are carried out in Lahore, Pakistan. The responses of low voltage channels, medium voltage channels, and transformer bridge for a 3–500 kHz NB-PLC frequency range are presented for DSM services. The master control room transmits control commands for the thermostat settings of SACs over power lines, crossing the transformer bridge to reach the SACs of power consumers by using communication protocol smart energy profile 1.0. The comparison of hourly and daily power consumption profiles under evaluation loads, by analyzing typical and variable frequency air conditioners on setting thermostat temperature at 25 °C and 27 °C conventionally and then by using DSM control technique, is analyzed. A prominent reduction in power consumption is found with the implementation of the DSM control technique.
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Rebello, Eldrich, David Watson, and Marianne Rodgers. "Ancillary services from wind turbines: automatic generation control (AGC) from a single Type 4 turbine." Wind Energy Science 5, no. 1 (February 12, 2020): 225–36. http://dx.doi.org/10.5194/wes-5-225-2020.
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Abstract. Wind turbines possess the technical ability to provide various ancillary services to the electrical grid. Despite this, renewable generators such as wind and solar have traditionally not been allowed to provide significant amounts of ancillary services, in part due to the variable and uncertain nature of their electricity generation. Increasing levels of renewable generation, however, continue to displace existing synchronous generation and thus necessitate new sources of ancillary or system services. This work is part of an ongoing project that seeks to provide empirical evidence and an examination of how ancillary services can be provided from commercially available wind turbines. We focus specifically on providing secondary frequency response (automatic generation control or AGC) and demonstrate that wind turbines have the technical capability to provide this service. The algorithms used are intentionally simple so as to evaluate the capabilities and limitations of the turbine technology. This work presents results from a single, 800 kW, International Electrotechnical Commission (IEC) Type 4 wind turbine. A total of 10 % of rated power is offered on the regulation market. We do not separate up- and downregulation into individual services. Upregulation is offered through a 5 % constant power curtailment. The AGC update interval is 4 s, to mimic real-world conditions. We use performance scoring methods from the Pennsylvania–Jersey–Maryland (PJM) operator and the National Research Council (NRC) of Canada to quantify the wind turbine's response. We use the calculated performance scores, annual site wind data, and 2017 PJM market price data to estimate income from providing secondary frequency regulation. In all cases presented, income from the regulation market is greater than the energy income lost due to curtailment.
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Yang, PhD, MSc, BSc, MBCS, CITP, Lili. "On-site information sharing for emergency response management." Journal of Emergency Management 5, no. 5 (September 1, 2007): 55. http://dx.doi.org/10.5055/jem.2007.0025.
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Emergency response to any man-made or natural disasters involves different organizations—such as fire and rescue service, emergency medical services, law enforcement (police forces), and responders from other governmental and nongovernmental organizations. Information sharing and management among these responding organizations is essential for the success of the emergency responses, not only during a disaster but also before and after the disaster. Information sharing among different organizations cannot occur overnight and must be in place before a disaster occurs, be able to be easily used during the disaster, and be maintained after the disaster. In this article, information sharing requirements and features for emergency response are discussed before an information sharing infrastructure is proposed. It is particularly expected to enable the response organizations to efficiently communicate with each other in the charged and high-pressure atmosphere of an on-going disaster response. On-site information collection is suggested to be carried out through wireless sensor networks (WSN) and radio frequency identification (RFID). The key technologies for securing information sharing in emergency response management are identified. Our ongoing project SafetyNET is described to illustrate the implementation of the information sharing system.
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Webborn, Ellen, and Robert S. MacKay. "A Stability Analysis of Thermostatically Controlled Loads for Power System Frequency Control." Complexity 2017 (2017): 1–26. http://dx.doi.org/10.1155/2017/5031505.
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Thermostatically controlled loads (TCLs) are a flexible demand resource with the potential to play a significant role in supporting electricity grid operation. We model a large number of identical TCLs acting autonomously according to a deterministic control scheme to provide frequency response as a population of coupled oscillators. We perform stability analysis to explore the danger of the TCL temperature cycles synchronising: an emergent phenomenon often found in populations of coupled oscillators and predicted in this type of demand response scheme. We take identical TCLs as it can be assumed to be the worst case. We find that the uniform equilibrium is stable and the fully synchronised periodic cycle is unstable, suggesting that synchronisation might not be as serious a danger as feared. Then detailed simulations are performed to study the effects of a population of frequency-sensitive TCLs acting under real system conditions using historic system data. The potential reduction in frequency response services required from other providers is determined, for both homogeneous and heterogeneous populations. For homogeneous populations, we find significant synchronisation, but very minimal diversity removes the synchronisation effects. In summary, we combine dynamical systems stability analysis with large-scale simulations to offer new insights into TCL switching behaviour.
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Rogall, Martin, Tazdin Amietszajew, Rohit Bhagat, Maria Brucoli, and David Greenwood. "On the utilisation of the pseudo-capacitive capabilities of Li-ion cells for the provision of frequency response services." Journal of Energy Storage 22 (April 2019): 311–17. http://dx.doi.org/10.1016/j.est.2019.02.028.
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Giacchino, Alessandro, and Enrico Repetto. "Natural gas combined cycle power plant aggregated with battery: a flexible hybrid solution providing enhanced frequency and balancing services." E3S Web of Conferences 113 (2019): 02002. http://dx.doi.org/10.1051/e3sconf/201911302002.
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The growth of renewable sources and the consequent complexity in the management of the electric grid draw a scenario in which the traditional fossil fuel power plants are asked to improve their performances to continue playing a primary role for the stability of the grid and the safety of the energy supply. The article describes the possible solutions to flexibilize the combined cycle power plants in terms of fast load response and load balancing. In particular, the aggregation of an energy storage system (battery) with a natural gas combined cycle power plant is analyzed in detail. In this context, the fundamental role of the Plant Optimizer, a dedicated Control System developed by Ansaldo Energia performing the function of aggregator, is highlighted. Thanks to the Plant Optimizer, the hybrid power plant can provide enhanced frequency and balancing services and ensure an increasingly aligned response with the needs of the grid operators.
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Rancilio, Giuliano, Arianna Rossi, Claudio Di Profio, Martino Alborghetti, Andrea Galliani, and Marco Merlo. "Grid-Scale BESS for Ancillary Services Provision: SoC Restoration Strategies." Applied Sciences 10, no. 12 (June 15, 2020): 4121. http://dx.doi.org/10.3390/app10124121.
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The future power system, characterized by lower inertia, reduced programmability and more distributed architecture, will depend on prompt and reliable control systems. Quick ancillary services provided by battery energy storage systems (BESS) could be a resource in order to deliver fast and precise response to frequency events. Degrees of freedom in the design of innovative products traded on ancillary services markets give the asset manager room for developing state-of-charge (SoC) restoration mechanisms. These are necessary to effectively exploit BESS as key resources for electricity balancing. This study compares the main SoC restoration strategies. It aims to define which ones are suitable for guaranteeing the reliability of the provision and the return on the investment. A robust regulatory framework analysis describes the degrees of freedom guaranteed by the main experiences around Europe. In this paper, a BESS model with variable efficiency is used to compare the provision of Frequency Containment Reserve (FCR) with different SoC restoration strategies exploiting one or more degrees of freedom. Here, we show that the degrees of freedom are key to the reliability of provision. Among most diffused mechanisms, dead-band strategies secure the desired consistency, but require large energy flows for SoC management. Thus, BESS life and economics decrease. The strategies based on minimum available energy guarantee assured reliability while being fair with BESS life and operation costs.
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., N. C. H. Varadaraju. "Use of Library Resources and Services at Stanley College of Engineering and Technology for Women, Hyderabad: A Case Study." Indian Journal of Information Sources and Services 8, no. 1 (May 5, 2018): 46–53. http://dx.doi.org/10.51983/ijiss.2018.8.1.504.
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Engineering college libraries play an important role in imparting quality education to the undergraduate and postgraduate students and researchers of engineering. This study aimed at frequency of library usage, the extent of use of library resources and services by the students and faculty. The level of satisfaction against library resources and service, the problems faced while using the library resources and services. A questionnaire was randomly given to 100 students and faculty of the college. A total of 92 filled in questionnaires returned to researcher. i.e. the response rate is 92%. It is suggested that college library should take initiative to counter problems expressed by users to provide effective and efficient library and information services to the clientele and it would in turn help faculty, students.
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Alrehaili, Naif Rashed. "A systematic review of the emergency planning for flash floods response in the Kingdom of Saudi Arabia." Australian Journal of Emergency Management 10.47389/36, no. 36.4 (October 2021): 82–88. http://dx.doi.org/10.47389/36.4.82.
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Every year, flash floods hit many cities in the Kingdom of Saudi Arabia (Saudi Arabia) leading to many injuries and deaths as well as a huge amount of damage to infrastructure. Risks of frequent flash floods have been linked to a lack of emergency planning. This paper presents a systematic review of emergency planning for flash floods response currently in place in Saudi Arabia. Collected information was analysed based on the suitability of content and data for emergency planning in flash floods response. Aspects of the dominant approach of emergency planning and the community-based approach are examined and considered against applications in Saudi Arabia. A case study is used about flash floods in Jeddah in 2009 and 2011 to consider these approaches. This may be the first systematic review of emergency planning for flash floods response in Saudi Arabia and shortcomings listed may lead to improvements in policy, planning and training, particularly given the scientific consensus of an increase in the frequency and magnitude of flash floods in Saudi Arabia.
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Campos-Gaona, David, Adam Stock, Olimpo Anaya-Lara, and William Leithead. "Dynamic Wind Power Plant Control for System Integration Using the Generator Response Following Concept." Energies 13, no. 7 (April 8, 2020): 1804. http://dx.doi.org/10.3390/en13071804.
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In this paper, a novel concept to integrate High Voltage Direct Current (HVDC)-connected offshore wind power plants with the onshore grid is presented. The concept makes use of a holistic wind farm controller along with a fully instrumented conventional synchronous generator at the point of common coupling. In our approach, the wind farm is able to replicate the natural response of the generator to a system, even enabling the wind farm to reproduce, in a scaled up manner, a range of ancillary services without having to rely on indirect frequency measurements which are prone to noise and delays. Simulation results are presented to validate the proposed solution.
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Lee, Rachel, Samuel Homan, Niall Mac Dowell, and Solomon Brown. "A closed-loop analysis of grid scale battery systems providing frequency response and reserve services in a variable inertia grid." Applied Energy 236 (February 2019): 961–72. http://dx.doi.org/10.1016/j.apenergy.2018.12.044.
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Lin, Houfei, Jianxin Jin, Qidai Lin, Bo Li, Chengzhi Wei, Wenfa Kang, and Minyou Chen. "Distributed Settlement of Frequency Regulation Based on a Battery Energy Storage System." Energies 12, no. 1 (January 8, 2019): 199. http://dx.doi.org/10.3390/en12010199.
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Battery energy storage systems (BESS) have wide applicability for frequency regulation services in power systems, owing to their fast response and flexibility. In this paper, a distributed method for frequency regulation based on the BESS is proposed, where the method includes two layers. The upper layer is a communication network composed of agents, which is used to transmit and process information, whilst the bottom layer comprises the power system with the BESS, which provides a frequency regulation service for the system. Furthermore, a set of fully distributed control laws for the BESS are derived from the proposed distributed method, where economic power dispatch and frequency recovery are simultaneously achieved. Finally, simulations were conducted to evaluate the effectiveness of the proposed method. The results show that the system frequency regulation and economic power dispatch are achieved after considering the limits of the battery state of charge and communication delays.
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Jiménez Chávez, Julio C., Esteban Viruet Sánchez, Fernando J. Rosario Maldonado, Axel J. Ramos Lucca, and Barbara Barros Cartagena. "Promoting Integrated Mental Health Care Services in Disaster Response Programs: Lessons Learned After the Impact of Hurricane María in Puerto Rico." Disaster Medicine and Public Health Preparedness 14, no. 1 (August 20, 2019): 130–38. http://dx.doi.org/10.1017/dmp.2019.58.
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ABSTRACTMeteorological and even human-made disasters are increasing every year in frequency and magnitude. The passage of a disaster affects a society without distinction, but groups with social vulnerability (low socioeconomic status, chronic medical, or psychological conditions, limited access to resources) face the most significant impact. As a result, psychological and behavioral symptoms (eg, depression and anxiety) can ensue, making the immediate response of mental health services crucial. Secondary data from a database of a temporary healthcare unit were analyzed. A total of 54 records were reviewed to collect information; univariate and bivariate analyses were done. The purpose of this article is to present our experience regarding the incorporation of a mental health services model, with its respective benefits and challenges, into a temporary healthcare unit, after Hurricane Maria in 2017.
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Ruiz, Semaria, Julian Patiño, and Jairo Espinosa. "PI and LQR controllers for Frequency Regulation including Wind Generation." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 5 (October 1, 2018): 3711. http://dx.doi.org/10.11591/ijece.v8i5.pp3711-3721.
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<pre>The increasing use of renewable technologies such as wind turbines in power systems may require the contribution of these new sources into grid ancillary services, such as Load Frequency Control. Hence, this work dealt with the performance comparison of two traditional control structures, PI and <span>LQR</span>, for secondary regulation of Load Frequency Control with the participation of variable-speed wind turbines. For this purpose, the doubly-fed induction generator wind turbine was modeled with additional control loops for emulation of the inertial response of conventional machines for frequency regulation tasks. Performance of proposed strategies was verified through simulation in a benchmark adapted from the <span>WSCC</span> 3 machines 9-bus test system. Results showed overall superior performance for <span>LQR</span> controller, although requiring more strenuous control effort from conventional units than PI control.</pre>
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Devin, A., and P. J. Fanning. "The Evolving Dynamic Response of a Four Storey Reinforced Concrete Structure during Construction." Shock and Vibration 19, no. 5 (2012): 1051–59. http://dx.doi.org/10.1155/2012/260926.
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Structures include elements designated as load bearing and non-load bearing. While non-load bearing elements, such as facades and internal partitions, are acknowledged to add mass to the system, the structural stiffness and strength is generally attributed to load bearing elements only. This paper investigates the contribution of non-load bearing elements to the dynamic response of a new structure, the Charles Institute, in the grounds of University College Dublin (UCD) Ireland. The vertical vibration response of the first floor and the lateral response at each floor level were recorded at different construction stages. The evolution of the structural response as well as the generation of a finite element (FE) model is discussed. It was found that the addition of the non-load bearing facades increased the first floor natural frequency from 10.7 Hz to 11.4?Hz, a change of approximately +6.5%. Similarly these external facades resulted in the first sway mode having its frequency increased by 6%. The subsequent addition of internal partitions, mechanical services and furnishings resulted in the floor natural frequency reducing to 9.2 Hz. It is concluded that external facades have the net effect of adding stiffness and the effect of internal partitions and furnishings is to add mass. In the context of finite element modelling of structures there is a significant challenge to represent these non-structural elements correctly so as to enable the generation of truly predictive FE models.
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Pebrianti, Wenny. "DEMOGRAFI PENGGUNA PRODUK DIGITAL ASLI KOTA PONTIANAK METODE CROSSTABS." Cakrawala Management Business Journal 3, no. 1 (May 19, 2020): 571. http://dx.doi.org/10.30862/cm-bj.v3i1.55.
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This study aims to determine the response of Pontianak City people to the original digital products of Pontianak by examining the association based on the category of gender, age, education, occupation, income and frequency of use with cross tabulation method.
Research is descriptive research. The population in this study is the people of Pontianak City who have used digital product services from Pontianak, namely Angkuts, Tripy and Gurukite.com. The sample size of 100 respondents was selected by purposive sampling, while the sample criteria were respondents with ages above or equal to 17 years, knew and had used Angkuts, Tripy or Gurukite.com services. Data processing techniques use cross tabulation analysis and association testing with chi square.
The results of cross tabulation and chi square between categories of gender, age, education, occupation, income and frequency of use showed significant results. There is a strategic relationship between categorical variables to be followed up by pontianak digital businessmen.