By George Kevin Jordan, AFRO Staff WriterMayor Muriel Bowser had a busy week. She turned in one of the most important documents that could impact the District. Nope – not the Mueller Report. The two-term mayor presented her fiscal Year 2020 Budget and Financial Plan to D.C. Council this past week after a season of public engagements, town halls and press events to bolster enthusiasm.“This budget is about ensuring that everyone living and doing business in the District is giving and getting their fair share,” Bowser said in a statement. “This is a budget that advances our D.C. values and addresses our city’s most pressing challenges – a budget that recognizes that these are very good times for Washington, D.C., and asks our commercial property owners to share some of the upside so that we can invest more in keeping D.C. affordable for Washingtonians across the income spectrum.”District of Columbia Mayor Muriel Bowser turned in her fiscal year budget for 2020 to the D.C. Council, with a great deal focusing on affordable housing and continuing her mission of offering Washingtonians a “fair shot.” (Courtesy Photo)“Fair” and “Fair shot” are words the mayor has used for years. The $15.5 billion budget is part of a larger attempt to get at equity for all D.C. residents in key areas like housing, education, families and public safety. And while the District boasts its 24th consecutive balanced budget, it faces a rise in fatal shootings and housing disparities that brought angry protesters during the mayor’s State of the District Address.Housing has been on many people’s minds and Bowser addressed it several times most recently during her address saying: “We know the number one issue on the minds of Washingtonians is affordable housing.”“Rising housing costs have created new challenges for homeowners and renters alike, particularly for those on a fixed income and those who are struggling to make ends meet,” the mayor shared.So how does that commitment toward housing translate in the budget? The mayor’s office highlighted a few areas including:Increasing the District’s investment in the Housing Production Trust Fund by 30 percent to $130 millionIncreasing the District’s investment in the Housing Preservation Fund by 50 percent to $15 million, which will yield an additional $45 million in private investmentThe creation of a new $20 million Workforce Housing Fund, which will leverage another $180 million in private sector investment$37 million in new funds to continue the implementation of Homeward D.C. to make homelessness rare, brief and non-recurring$5.2 million to expand and increase Schedule H – DC’s income tax credit to help offset rising property taxesTo make the District safer the Mayor’s office stated they would invest in the following ways.$3 million to expand the Metropolitan Police Department (MPD) workforce to 4,000 officers by 2021, focusing on bike and on-foot officers$3.5 million in new funds to add four ambulance units, including 45 firefighter paramedics or firefighter EMTs$3.3 million to bolster the efforts of the Office or Neighborhood Safety and Engagement, including $610,000 to support increased wages for the Pathways program to more participants and grow the reach of the Aspire to Entrepreneurship Program$1.6 million to our Office of Victim Services and Justice Grants to open three new offices where residents can get trauma-informed mental health support and where we can train community leaders in strategies for addressing traumaThe D.C. Council still has to hold oversight hearings on the budget through the spring. Voting on the budget won’t happen until sometime in June. To view the full FY2020 budget or selected highlights please visit: https://mayor.dc.gov/2020budget
Explore further Journal information: Chemistry of Materials Red, green, and blue QLEDs, with the applied voltages in the upper left corner. The green QLED has a luminance of 168,000 candelas per square meter, which is more than three times higher than the previous best QLED brightness. Image credit: Jeonghun Kwak, et al. ©2012 American Chemical Society In areas besides brightness, the QLEDs have also improved but still lag behind OLEDs. The new QLEDs’ efficiencies (7.3%, 5.8%, and 1.7% for red, green, and blue devices, respectively) improve over previous QLEDs, although OLEDs can have efficiencies of up to 20%. Another challenge for both QLEDs (and OLEDs to a lesser extent) is lifetime. Since the early research of the ’90s, QLED lifetimes have not improved past a few tens of hours, and they experience rapid deterioration within a few hours of operation. QLEDs with inverted structures, like those used here, can have half-lifetimes of up to 600 hours, compared with tens of thousands for OLEDs.Although QLEDs don’t match the performance of OLEDs, the engineers explain that QLEDs have a few potential advantages that make them worth investigating further.“The luminous efficiency of the best OLEDs (phosphorescent OLEDs) and inorganic LEDs are comparable, up to ~100 lm/W for white emission,” Changhee Lee said. “However, the efficiency of QLEDs is still way behind, about 10 times lower. The efficiency of red and green QLEDs reported in our paper is comparable to the efficiency of the best ‘fluorescent’ OLEDs, which use fluorescent organic dyes as emitters. Of course, the lifetime of QLEDs is much lower than OLEDs and inorganic LEDs at this time. The potential advantages of QLEDs are: (1) much narrower emission bandwidth (full width at half maximum ~30 nm compared with 60-80 nm of OLEDs), which means that QLEDs have more saturated and purer color than OLEDs; (2) easier tunability of emission colors in the entire visible range by simply controlling the particle size and shape with the same chemical composition for the QD; (3) and therefore the cost of emitters are much lower for QLEDs while organic phosphorescent emitters used for best OLEDs are very expensive.”Overall, the brightness, efficiency, lifetime, and low turn-on voltage of the new QLEDs suggest that the quantum dot devices could have promising applications as TV, computer, and phone displays as well as lighting devices. Since quantum dots can be printed as ink, these displays and devices could also benefit from low-cost production methods.“Our future plan is to further improve the efficiency and reliability of QLEDs, in particular, blue QLEDs,” Changhee Lee said. “In parallel, we will make a full-color active matrix QLED display using our improved RGB QLED technology. We will also work on developing Cd-free QLEDs because of environmental and safety concerns related with Cd. We recently reported InP QLEDs in Chemistry of Materials, but their efficiency is very low. Therefore, we will work on developing new precursors for InP QDs and improving the performance of Cd-free OLEDs.” (Phys.org) — While quantum dot-based light-emitting diodes (QLEDs) are not made of organic materials, they share many of the same advantages as organic LEDs (OLEDs). For instance, both QLEDs and OLEDs outshine semiconductor-based LEDs in terms of their greater flexibility, better color quality, and potential for lower cost since they can be fabricated using a simple process on a large-area substrate. But ever since the first QLEDs were demonstrated in the mid-’90s, about a decade after OLEDs, their performance has lagged behind OLEDs despite ongoing improvements. Now in a new study, a team of researchers from South Korea has designed and demonstrated QLEDs with an improved efficiency and unprecedented brightness that matches the brightness of today’s best fluorescent OLEDs. Citation: Quantum dot LEDs get brighter, more efficient (2012, April 20) retrieved 18 August 2019 from https://phys.org/news/2012-04-quantum-dot-brighter-efficient.html More information: Jeonghun Kwak, et al. “Bright and Efficient Full-Color Colloidal Quantum Dot Light-Emitting Diodes Using an Inverted Device Structure.” Nano Letters. DOI: 10.1021/nl3003254 Copyright 2012 Phys.Org All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. The research teams at Seoul National University, South Korea, led by Changhee Lee, Kookheon Char, and Seonghoon Lee, have published their study in a recent issue of Nano Letters.As the researchers explain in their study, the key to improving the brightness and efficiency of the QLEDs is improving the injection of current-carrying electrons and holes into the quantum dots. The more efficiently the electrodes can inject electrons and holes into the quantum dots, the more efficiently the device can emit light. Usually, the anode is made of indium tin oxide, whose transparency allows light to escape. But here, the researchers inverted the device by making the indium tin oxide the cathode with the help of zinc oxide nanoparticles as an electron transport layer, which performed charge carrier injection much more efficiently than before.“The most important cause of the low performance of QLEDs is the poor injection of holes into the quantum dots (QDs) from the anode and neighboring hole transport layer due to a huge potential energy barrier,” Changhee Lee told Phys.org. “Because of that, the electron-hole balance is not achieved, resulting in low quantum efficiency and low maximum brightness. Furthermore, the excess electrons or holes, which do not recombine in the QD layer and enter the neighboring organic hole-transport or electron-transport layers (HTL or ETL), can cause leakage current and device degradation, resulting in poor efficiency and stability. Therefore, good carrier injection is a key factor for realizing high-performance QLEDs.”By patterning different sized quantum dots on the layer of zinc oxide nanoparticles, the engineers could fabricate QLEDs of three different colors: red, green, and blue. Whereas previous QLED brightness levels were in the range of 10,000 candelas (cd) per m2, the new red QLED displayed a brightness of 23,000 cd/m2 and the green achieved a remarkable 218,000 cd/m2 – the highest ever for a QLED and comparable to the best OLEDs. The previous highest QLED brightness is 68,000 cd/m2, which was for a green QLED reported last year by Lei Qian, et al. The new blue QLED displayed a lower brightness of 2,000 cd/m2, but low blue performance has been one of the biggest disadvantages of both QLEDs and OLEDs. Quantum-dot LED screens may soon rival OLEDs and LCDs , Nano Letters This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
Get ready for a cultural fest where Turkish art, music, dance and food will come together to create a heady culture-cocktail. The New Delhi Turkish Fest will be open to the general public free of charge from 5-10 PM on Friday, 22 March and from 11am to 10 pm on 23 March and 24 at Select City Walk, Saket. The festival is being inaugurated by HE Dr. Burak Akcapar (Turkish Ambassador in India).Visitors will get an opportunity to celebrate, learn and savor Turkish hospitality, culture, heritage and cuisine. Organized by the Indialogue Foundation, this year the festival will showcase the miniatures of some of Turkey’s greatest monuments such as the Hagia Sophia, Blue Mosque, Rumi’s Tomb, Capadocia, etc. Also Read – ‘Playing Jojo was emotionally exhausting’The festival will have performances by the Whirling Dervishes of Rumi, Live Turkish music and folk dance performances, Ney performances, (Ney is a rim-blown, oblique flute made of reed and has six finger-holes in front and a thumb-hole in back. Using cross-fingering, finger-hole shading, and embouchure adjustment). Besides these there are also performances by Mehteran, the Ottoman Military Band thought to be the oldest variety military marching band in the world. There will also be calligraphy demonstrations where you can get your messages engraved on cards, key rings, plates and tablets and an Oriental Corner where you can pick some decorative Turkish pillows, tables traditional jewelry, handicrafts, rugs and more.And don’t miss the chance to sample authentic gourmet Turkish pleasures.DETAILAt: Select Citywalk, SaketWhen: 22 – 24 MarchTimings: 5 pm onwards
Kolkata: As many as 10 idols that have attracted pandal-hoppers during Durga Puja this year, will find their place at the refurbished art gallery beside Rabindra Sarobar. This will not only provide an opportunity to those who could not make it to the pandals but also the art lovers, as they will be able to witness the same throughout the year.The outside of the main hall within the boundary walls of the gallery that has space for accommodating three idols, has already been occupied. The idols of Bhowanipore 75 Palli and Dum Dum Park have already made their way to their second address, while last year’s idol of Chetla Agrani has also been placed. Also Read – Rain batters Kolkata, cripples normal lifeSeven other idols will be placed on separate concrete structures inside the main hall. The idol of Behala Friends Club will reach on Monday and the idol of Bakulbagan in Bhowanipore will also find its place there. “The five other idols will be decided after the Pujo Carnival on Tuesday. It will take some more time to arrange the idols in a systematic manner. The gallery is expected to be thrown open for the public soon after Kali Puja,” a senior KMDA official said. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedIt may be mentioned that KMDA has given a major facelift to the gallery that was created in 2012 for preserving the best Durga idols. The gallery, a brainchild of Chief Minister Mamata Banerjee, preserves around 10 idols every year, which are replaced by new ones the following year. Some issues over maintenance had cropped up after 2016, following which the decision of facelifting it was taken. The work that involved around Rs 2 crore, was supervised by KMDA executive engineer Sudhin Nandy.