Auc 4s0101 chip

Body Length (mm) 5. Results are displayed as AUC, which is the area under the flow pressure curve over 10 minutes. www. This item: New Genuine BMW Sensor F Auc (2002-2008) OE 64116933052. N-channel - Enhancement mode - Logic Level. 1. The 410101 components of Jotrin Electronics are carefully chosen, undergo stringent quality control, and are successfully meet all required standards. It is designed to protect a low-noise receiver from high-voltage transmit pulses in ultrasound applications and is commonly referred to as a T/R (transmit-and-receive) switch. Pins 1&2, 5&6, 8&9, 12&13 are gate inputs. There are 2 items that have plugs on them sitting in front of your passenger-side microfilter housing cover. BMWPartsDeal. Feb 28, 2020 · The MD0101 is a four-channel high-voltage current-limiting protection device. Order Chip Quik Inc. Advantages of QFNs: Compact size, making them ideal for space-constrained applications. The IR Advantages: Increased power density. Weight: 1. 156005 4S0101 NSN part is available under FSC. The junction box electronics unit transmits relevant data to the IHKA control panel (via the K‐CAN). Characteristics at low temperature. All reagents necessary to run the test are contained within the assay chip. Contact Us: Live Chat or 1-888-580-1680. 21 mm Body [BGA] Microchip Technology Drawing C04-25172 Rev A. 96. Infineon’s Dual Gate MOSFET (IAUTN08S5N012L) is an 80 V product with an RDS of 1. Parts# 64 11 6 917 001 64-11-6-917-001 64. Auc for 2017 BMW M6 Coupe(F13) with great price and fast delivery. 3. Chips are compact elements that represent an input, attribute, or action. Sound Semiconductor are powering a whole new age of analogue synths. You can customize the chip with different elements, such as names, avatars, text, and icons. All however appear to be exchangeable. Increased reliability. (BSA Cyber Chip blue card - can be ordered at https://www. AEC Q101 qualified. REAGENTS AND MATERIALS PROVIDED: The PL Chip for T-TAS 01 is a ready-to-use, single use assay chip. The 410101 parts manufactured by MICROCHIP are available for purchase at Jotrin Electronics. The junction box electronics evaluate the data of the AUC sensor. Terminal Pitch (mm) 0. TI is a global leader in the production of analog and digital signal processing (DSP) integrated circuits, as well as embedded chip. While included here as a standalone component, the most common use will be in some form of input, so some of the behavior demonstrated here is not shown in context. e and solder interconnects to reflow temperat. In this project we designed a SOC processor to offer high multithreaded performance, as well as high single threaded performance from the same chip. SDRAM d i f SIP DDR1 2. The estate car also benefits from improved acceleration and more power. Capacitor mounted by its body which is rigidly clamped to the work surface. AUC. Environmentally friendlier. Compute Area Under the Curve (AUC) using the trapezoidal rule. All Orders are Fulfilled in the U. SoCs / ˌˈɛsoʊsiːz /) is an integrated circuit that integrates most or all components of a computer or other electronic system. QFN is an acronym for quad flat no-lead package. In general, the construction of any organ-on-a-chip system is guided by design principles based on a reductionist analysis of its target organ ( Fig. DELIVERS AMAZING POWER AND FUEL ECONOMY. Parameters: Apr 28, 2021 · QFN package. Supersedes the following BMW part numbers: 64116826346 (64-11-6-826-346) To IEC 60068-2-6, test Fc: Frequency range 10 55 Hz, displacement amplitude 0. 844-643-4663. Just to clarify: Since BOTH the AUC and Refrigerant Pressure Sensors (along with the Compressor Control Valve are connected to the JBE which is in turn connected to the IHKA, I would presume that either code (A6CF or 9C5E) was Continuous drain current I D V GS=10 V, Chip limitation 1,2) V GS=10V, DC current 3) T a=100 °C, V GS=10€V, R thJA on 2s2p2,4) Pulsed drain current2) I D,pulse T C=25 °C, t p= 100 µs Avalanche energy, single pulse2) E AS I D=88€A Avalanche current, single pulse I AS – Gate source voltage V GS – Power dissipation P tot T C=25€°C Oct 12, 2020 · Graphic Processing Unit (GPUs) GPUs are the chips responsible for the graphics you see everytime you open up a computer or mobile device. org . In this video, I will show you how to replace the Air Conditioning Automatic Recirculation Control Sensor (AUC Sensor). The heatsink that came loose looks like this one. Call (310)626-8765. 1 ). There are also many third-party management solutions, such as Ansible and Puppet, that can utilize Cisco’s Continuous drain current I D V GS=10 V, Chip limitation 1,2) V GS=10V, DC current T a=100 °C, V GS=10€V, R thJA on 2s2p 2,3) Pulsed drain current2) I D,pulse T C=25 °C, t p= 100 µs Avalanche energy, single pulse2) E AS I D=45 A Avalanche current, single pulse I AS – Gate source voltage V GS – limited to duty factor of 1% Power Apr 1, 2019 · OptiMOSTM - power MOSFET for automotive applications. Low RDS(on) to Minimize Conduction Losses. About 80% are made in Asia. Each point on the ROC curve corresponds to one of two quantities in Table 2 that we can calculate based on each cutoff. MSL1 up to 260°C peak reflow. 6% CV (low AUC) Reportable Range 0. The MIC4100/1 are high frequency, 100 V Half Bridge MOSFET gate driver ICs featuring fast 30 ns propagation delay times. TI’s CD4011B is a 4-ch, 2-input, 3-V to 18-V NAND gates. 7 AUC Cutoff AUC < 260 Assay Imprecision SD ≤ 39 AUC 2. Model: 936-0066 0302/02. Actuators - OEM BMW Part # 64119240180 (64-11-9-240-180, 64116926460, 64116988303, 64119136607) the vacuum on the placement head and retract the placement arm, leaving the device in place. Buy BMW M6 SENSOR F. Jan 20, 2020 · The SoCs in the 1970s. metrics. 2. You need to allow connections on the phone (depending on the phone’s operating system). Thank you for your help! I need to replace my AUC sensor which is the original one. %PDF-1. The PQFN (PowerQuad® Flat No-Lead) is a highly eficient space-saving package designed for a wide range of higher power applications. Line a large baking sheet with parchment paper or a silicone baking mat and set aside. 10 g, duration 3 · 2 h. One for te compressor start, one for the circulation and the third is for windscreen heater. • Turn on the speaker system Bluetooth mode. Preheat the oven to 350°F (177°C). The best possible AUC value is 1. 11. Current: 1. CCK sells Datamars Slim USDA 840 Micro Chip box of 10 for Sheep or Goat. ion-chip is a component that allows you to display complex entities in small blocks, such as a contact. Actuators - OEM BMW Part # 64119240180 (64-11-9-240-180, 64116926460, 64116988303, 64119136607) DOCOBEIT RESUME ED 190 310 RC 012 158 TITLE Meetings of the American Indian Policy Review. S. How a semiconductor factory could transform Columbus Jan 1, 2020 · Cyber Chip Requirements for Grades 4-5. 12 Weeks. A package may have up to four lines of marking. These resistors function as pull-up resistors. › See more product details. The pinout diagram, given on the right, is the standard two-input CMOS logic gate IC layout: Pin 7 is the negative supply. Oct 6, 2022 · Memory chips are semiconductor devices made up of transistors and capacitors that serve as internal storage space for computers. Part Number: 43-79-0-088-585. Compliant. ily in High Current PQFN 5x6 mm PackageIR has expanded its portfolio of HEXFET® power MOSFETs to offer a complete family of mid-voltage devices available in a 5x6mm PQ. AUC is calculated as the area below the ROC curve. should have 2 silver wire loops to hold a spring that goes across at an angle on top of the exposed NorthBridge chip. 35. sklearn. shown in the picture. 5 is as good as random choice. You may also manage your servers with Cisco UCS Manager running a 6300 or 6400 series Fabric Interconnect. Package. IPC0101 (IPC0101-ND) at DigiKey. 3 6 0 obj /BitsPerComponent 8 /ColorSpace /DeviceRGB /Filter /JPXDecode /Height 4425 /Length 7 0 R /Name /ImagePart_585 /Subtype /Image /Type Jan 21, 2022 · COLUMBUS, Ohio (AP) — Intel will invest $20 billion in a new computer chip facility in Ohio amid a global shortage of microprocessors used in everything from phones and cars to video games. Min. For an alternative way to summarize a precision-recall curve, see average_precision_score. com offers genuine Sensor F. Contact Mouser (Bangalore) Aug 30, 2020 · Instructions. ) Discuss with your unit leader the acceptable standards and practices for using allowed electronic devices, such as phones and games, at your meetings and other Scouting The Ion 510 Chip Kit contains 8 barcoded chips for sample tracking and sequencing with the Ion S5 and Ion S5 XL sequencing systems. This ensures the best success rate and best longevity available for your HVAC / AUC sensor repair. Card: binary Founded in 1853 by George Crum, Saratoga Chips of Saratoga Springs, New York is an American original. Use the de-soldering tool to heat both dev. A “Smart Power” option in today’s power electronic world, the PQFN is a step above the standard low-power sawn QFN package, while being more flexible (IC control die integrated designs) than other Jan 19, 2022 · A ROC curve is an enumeration of all such thresholds. The 2 Solder bumps upper left and lower right with white rectangle around them. Improved thermal performance due to a large exposed pad. The following information is usually contained in each line. scoutshop. Texas Instruments. The back metallization on the monolithic chip is designed to be used May 12, 2022 · The organ-on-a-chip (OoC) is an intriguing scientific and technological development in which biology is coupled with microtechnology 1,2 to mimic key aspects of human physiology. Helping reunite lost pets with their owners since 1995 with pet microchips for dogs and cats & our nationwide lost pet recovery service. Manufactured to meet specifications for fit, form, and function. 0, corresponding to a model that achieves 100% sensitivity and 100% specificity. It looks like this part has been replaced by different versions over the life of the model to the extent the original one and latest one bear no resemblance. It must be enabled in the wireless settings. Mar 1, 2015 · When I pull it up on DIS it shows "value or signal above threshold". The chip takes Order Chip Quik Inc. 0, indicates superior performance. Small Footprint (5 x 6 mm) for Compact Design. Skip to Main Content. Jul 12, 2011 · The Intel chip you show in the picture definitely has spots for a heatsink. The marking on the chip is ahv31f. ViaGuard (no info if unenrolled) 877-842-4827. 0 – 447. Very easy to replace. Each channel has three terminals: TX, RX, and RGND. This gives the BMW M6 noticeably more performance and power. Note. 29 A. Is this because the AUC sensor is busted? Spectrum Semiconductor Materials: Semiconductor ceramic and plastic packaging offers side braze, leaded/leadless chip carriers, cerquad, pin grid array, QFN, combo lids and open cavity plastic packages. In a medium-sized mixing bowl using an electric mixer, beat the butter, brown sugar, and granulated sugar together for 1 to 2 minutes or until well combined. Consult your sales manager to explore more core business opportunities. No exceptions. Manufacturer Standard Lead Time. Multi-vendor compatibility. 23, 2024 (A). Contains FDX-B ISO 11784/85 microchip scans with reader. The analog switch terminals are TX and RX. COM. 3x3. Verify all content and data in the device’s PDF documentation found on the device product page. Max. impedance VR £ 400 V ‡ 450 V 500 550 V ratio at 100 Hz. Manufacturer Product Number. An icon used to represent a menu that can be toggled by interacting with this icon. re, waiting until all the so. Easier manufacturing. PowerControl X from DTE optimizes all signals from the engine management system and matches the control parameters in the best possible way. AKC Reunite Microchip Store. Premise ID required to order. In addition, the GPU delivers performance comparable to a high-end GPU in Application Usage Control (AUC) Indicates issuer's specified restrictions on the geographic usage and services allowed for the application: Card: binary '70' or '77' 2: 2: primitive: 9F07: Application Usage Control (AUC) Indicates issuer's specified restrictions on the geographic usage and services allowed for the card application. Volume 5. 7 AUC ASA, aspirin monotherapy, DAPT, dual antiplatelet therapy, VWD, von Willebrand disease, GT, Glanzmann’s thrombasthenia Memory Subsystem l a i This section consists of: Boot ROM SDRAM SD/MMC Interface t n e 2. 6 %ñù÷ö %3. 60 kg. Buy 156005 4S0101, NSN part by Cooper Tools Inc Div with NSN 4720006182847 and CAGE Code [CAGECode]. Herr's. A system on a chip or system-on-chip ( SoC / ˌˈɛsoʊsiː /; pl. Commission (January 6, 7, February 4 and 5, 19771. It is only working when you have the circulation button on the climate control panel. Jul 7, 2006 · The AUC sensor under the airfilterbox is for the climate control to keep polution outside the car. NTMFS011N15MC. Type. Chips allow users to enter information, make selections, filter content, or trigger actions. Addeddate 2015-08-10 14:34:04 Call number UPUB S1. Manufacturer. 3 Source-Down Center-Gate (CG) package, offering the industry’s lowest on-state resistance R DS (on) at 25˚C, superior thermal performance, and optimized parallelization. With 57 billion transistors — 70 percent more than M1 Pro and 3. , down from 37% in the 1990s, according to industry officials. No Tools or Wiring Needed. May Qualify For FREE SHIPPING. Aug 24, 2020 · The AUC sensor detects the following pollutant emissions from spark-ignition and diesel engines: The junction box supplies the AUC sensor with voltage. First line: Manufacturing information Company logo Wafer and/or assembly plant codes (optional) (see Table. Apr 5, 2022 · That allows really precise short-range location-aware communication, much more accurate than GPS or Bluetooth information. 2 kHz ISO microchips are seamless, 100% bioglass encapsulated transponders. 75 mm, acceleration max. PA0101-S (PA0101-S-ND) at DigiKey. PL CHIP AUC 260 NORMAL ABNORMAL PERFORMANCE CHARACTERISTICS Reference Range 270. Manufacturer: DENISON HYDRAULICS Type: Directional Control Valve Model: 4D01 3151 0101 B1G0Q Size: NG 6 Type of Actuation: Electrically Ambient Temperature. Some of the LED driving circuitry in that wristwatch was actually too large so that was Oct 18, 2021 · M1 Max features the same powerful 10-core CPU as M1 Pro and adds a massive 32-core GPU for up to 4x faster graphics performance than M1. Diagrams. " May 29, 2018 · The first is the same one you have re the AUC, the second is DRUCK_SENSOR (9C5E), which translates to pressure sensor. 43. The online versions of the documents are provided as a courtesy. All shipments must comply with U. 001 Identifier mdu-univarch-026967 Identifier-ark ark:/13960/t89g9849g Ocr ABBYY FineReader 9. 1 and Table 2) Date code (see Table 4, Table 5, and Table 6) Die run (wafer lot) code Second Line: Device part number Device About Texas Instruments. auc(x, y) [source] #. 15 milliohms, making it an ideal choice for use in disconnect switches This is BMW parts item 64119240180 (64-11-9-240-180), described as Genuine BMW Sensor for Automatic Recirculation Control (AUC), that you can buy at the best price with fast shipping. They can be used on stock or performance enhanced vehicles. Check stock and pricing, view product specifications, and order online. We were really excited to bring this range to Thonk in 2021. I bet buying a new one will clear the fault. Body Width (mm) 5. The MIC4100 has CMOS input thresholds, and the MIC4101 has TTL input thresholds. Apr 6, 2021 · Intersight is a cloud-based SaaS management platform that supports infrastructure management as well as many other services. For example, an AUC score of 0. 175°C operating temperature. We will feed it 5V of power, so we give +5V to pin 14 and we connect pin 7 to GND. Learn how to use ion-chip in your Ionic Framework apps with this documentation. The United Self-Defenders of Colombia ( Autodefensas Unidas de Colombia, or AUC, in Spanish) was a Colombian far-right paramilitary and drug trafficking group which was an active belligerent in the Colombian armed conflict during the period from 1997 to 2006. These components almost always include on-chip central processing unit (CPU), memory interfaces, input/output devices and interfaces, and secondary Buy Now. FL,United States : 09/06/2023 : 156005-4S-0101 Company Name Inject-able Microchip can be used in for Sheep or Goat and read by ISO 11784/85 readers. IC GATE NAND 4CH 2-INP 14DIP. They power the computation needed to populate each pixel on the screen. It is completed shorted so I need to find a replacement. For computing the area under the ROC-curve, see roc_auc_score. 15-digit begins 900108. But I noticed with the M5, if its currently on auto and set to exterior, when I dial the temp down, it doesn't automatically flip to axillary. 9 would imply that the model is very likely to assign larger probabilities to random positive examples than random negatives. Type: Solenoid Coil. AUC (area under the ROC curve) is the probability that a classifier will rank a randomly chosen positive instance higher than a randomly chosen negative one. Texas Instruments (TI) is a publicly traded company that designs and manufactures semiconductor and computer technology products. The only independent distributor. en there is no r. The PL Chip analytical path contains Type I collagen isolated from pig tendon An icon used to represent a menu that can be toggled by interacting with this icon. Pin 14 is the positive supply. 8% CV (high AUC) 19. If you get code A6CF this sensor is Genuine BMW AUC Sensor Automatic Recirculated Air Control InStock Ships Today! $76. 5x more than M1 — M1 Max is the largest chip Apple has ever built. By eliminating the use of an optical detection system, this advance in next-generation sequencing Mar 15, 2023 · We rounded up America's best chip brands and ranked them to ensure you only spend your hard-earned cash on the best on the market. Nowadays, the GPUs are much more multi-purpose than just graphics, which is why we see them in the news a lot. Also known as: M6C-4S1HX51-T003 Specifications Customer Reviews Radiation-Hardened MOSFET Qualified for Commercial and Military Satellites and Space Power Solutions JANSR2N7593U3 M6 Technology Features The following are key features of the JANSR2N7593U3 Chip Length D1 7. 6. The Ion 510 Chip electronically detects polymerase-driven base incorporation without the use of fluorescence. CD4011UBE. Find parameters, ordering and quality information Feb 20, 2017 · The 4011 is a member of the 4000 Series CMOS range, and contains four independent NAND gates, each with two inputs. Feedback. Sales records for auc TFS Smart Chip 1R. The U1 joins other "dedicated" chips developed by Apple, like the W1 and 855-684-3184 ext 3. BMW Performance Chips From Thorton Chip Tuning are a plug and drive solution to add more power and increase the performance of your BMW engine without making any permanent modifications. RECOMMENDED LAND PATTERN Dimension Limits Units tandards. It consist of 8 banks and 8 cores and each core consist of 8 threads of which 2 can be executed simultaneously. May 30, 2022 · Needing to identify this chip which is near the USB ports on an HP motherboard. 001 64116917001. Our 134. The MPS4101‐012S and MPS4102‐013S are a single chip silicon monolithic series/shunt element. . 917. 20. The OptiMOS™ Source-Down is a revolutionary technology with a Aug 23, 2022 · More simplistically, AUC score can be interpreted as the model’s ability to accurately classify classes on a scale from 0 to 1, where 1 is best and 0. 3 button. Read, commit to, and sign the Level I Internet Safety Pledge. Enjoyed by the wealthy patrons of New York City and the world famous Saratoga Race Course Jan 11, 2022 · Only 12% of the world's chips are made in the U. Oct 11, 2023 · A QFN is a surface mount component with a flat, quad-shaped package and no leads extending from the sides. To each of the pushbuttons we connect a 10KΩ resistor. A. The parasitic inductance is minimized in this design resulting in wide band, low loss, high isolation performance. HOSE ASSEMBLY NE: 2 Quick RFQ. 3 – 467. 60 Second Installation. I have a standard clima. USDA 840 micro chips for Deer, Sheep, or Goat permanent ID 10 in a box. Features. Jun 27, 2014 · Genuine BMW part that fits your specific vehicle. These high standards have evolved through evaluating many different materials and designs. comAN-1169Version 4, March 2014Board Mounting Application Note Page 1 of 11IntroductionPower Quad Flat No-Lead (PQFN) is a surface mount semiconductor technology designed 296-14086-5-ND. Sound Semiconductor have a stunning range of IC’s including the Dave Rossum designed SSI2140 filter as used in the brand new Sequential Prophet 5 rev4. e to approximately 100°C (150°C for lead-free assembly) using the substrate heating stage. irf. The best thing about Herr's is their Mar 29, 2024 · An ROC curve (receiver operating characteristic curve) measures the performance of a classification model by plotting the rate of true positives against false positives. Report an issue with this product or seller. REXID-PET. e nace n nacen w nacew h nach l nacl u nacnw p nacp * s nacs v nacv vf nacvf g nacx k nacy z nacz zf naczf j nase v natf f natk f natt m natu Chip. One is the hood switch and the other is your AUC sensor. It dates back to the early 1970s in the new era of the digital watch when the first LED wristwatch was announced. The capacitors of the chip are used to store binary logic bits, while the transistors of the chip are used to read and write data to the capacitors. Instagram. PQFN. It was founded in 1930 and is headquartered in Dallas, Texas. Here you can find various types and values of electronic parts from the world's leading manufacturers. Mobile device TOP Panel Buy BMW M6 SENSOR F. Voltage: 24 V DC. T REGISTRY (IPR) (Infoif unenrolled, but manufacturer may sell transponders direct to consumer & t. The low-side and high-side gate drivers are independently controlled and matched to within 3 ns typical. You can rest assured that this is the LATEST and newest design xAUC ambient temp sensor, and contains and design or manufacturing improvements BMW has made through the years. Sound Semiconductor are a veteran team of musicians and Feb 27, 2023 · APEXMIC Chips • First-to-market • ASIC design with c onsistent performance • Easy to install in recycled cartridges APEXMIC has now launched the new replacement chips for the Brother LC401/411/421/462/472 series. Like any other IC package, the function of a QFN package is to connect the silicon die of the IC to the circuit board. with a NO CHINA SOURCING Pledge. • Hold the phone close to the NFC mark u on the top panel and wait for a short beep to con-firm a successful speaker connection. A system-on-a-chip technology was intended to provide miniaturization. 46 REF (AUC) - 29x29x2. It is a leadless package that comes in small size and offers moderate heat dissipation in PCBs. Instead, it features exposed metal pads on the bottom, facilitating soldering to the PCB. Last owned by TwinForestStables TwinForestStables sold to HuntAndJump Auction Bidder for 2500 hb's on Apr. A export laws. Aug 30, 2021 · I know on other vehicles I have, with the climate control set to auto, it will flip between the two depending on how you set the temp dial. 080 42650011. PA0101 Chip Quik Sockets & Adapters LGA-14 to DIP-14 SMT Adapter datasheet, inventory & pricing. Born of an African-American father and a Native-American mother in pre-Civil War New York, George Crum was the creator of America’s first Kettle Chip. Heat the s. Green Product (RoHS compliant) 100% Avalanche tested. A higher AUC value, closer to 1. 0 Ppi 300 Jan 25, 2024 · The Area Under the Curve (AUC) is a quantitative measure of the model’s discriminative ability. Recirculated Air Control. The MIC4100/1 include a high voltage IQE046N08LM5CG is Infineon’s new best-in-class OptiMOS™ 5 power MOSFET logic level in a PQFN 3. 15-digit begins 900111 900113 900115 900118. For a data set with 20 data points, the animation below demonstrates how the ROC curve is constructed. Although such evaluations have yielded good results, the recom. The AUC was responsible for retaliations against the FARC and ELN communist Jun 7, 2019 · Organs-on-a-chip can be broadly defined as microfabricated cell culture devices designed to model the functional units of human organs in vitro ( 7 – 12 ). It took 44 logic ICs to be reduced into one chip. Boot ROM On-Chip ROM boot loader Support system boot from SPI Nor/Nand Flash, and SD/TF card Support system code download through USB OTG 2. Mar 20, 2015 · 首页 首页; 看点 znds看点频道; 新手 新手入门教程专题; 应用下载 智能电视应用软件游戏下载; 当贝市场 当贝市场tv客户端; 教程中心 软件教程中心 AUC OST Item Catalog Number T-TAS® 01 Total Thrombus Formation Analysis System Instrument 18001 PL Chip for T-TAS® 01 (20 Chips) 18002 PL Chip Reservoir Set for T-TAS® 01 (100 Sets) 18003 BAPA Tube for T-TAS® 01 (50 Tubes) 18004 AR Chip for T-TAS® 01 (20 Chips) 19001 HD Chip for T-TAS® 01 (20 Chips) 19002 BMW M6 chip tuning: The perfect performance upgrade for more HP. Memory chips are important for both temporary and permanent storage 156005-4S0101 4720-00-618-2847: Company Name. This establishes power to the chip. Low QG and Capacitance to Minimize Driver Losses These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS. Pins 3, 4, 10, 11 are gate outputs. This is a general function, given points on a curve. First and foremost, we must give power to the 4011 NAND gate chip. Description. fi iv vd ko qn ye pp om gk md