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SRT

SRT is an initialism or three-letter abbreviation with multiple meanings, as detailed below. == Automotive == == Science and Technology == == Transportation ==
  • [[State Railway of Thailand]], the national railway operator of Thailand
  • [[Short Range Transport Aircraft]], a type of aircraft designed for short-distance transport
== Other uses ==
  • [[Special Response Team]], a tactical unit in law enforcement or military contexts
  • [[Sex reassignment therapy]], medical and psychological treatment for gender transition
  • [[Seattle Repertory Theatre]], a regional theater in Seattle, Washington
  • [[Short-term residential treatment]], a form of mental health or addiction care
For other uses, see [[SRT (disambiguation)]].

Automotive

Street and Racing Technology

Street and Racing Technology (SRT) originated in 2003 as a high-performance vehicle division within , evolving from the earlier Performance Vehicle Operations (PVO) group established in 2002 to centralize engineering for potent street-legal cars. This branding unified efforts from Dodge Motorsports, , and Viper development teams, focusing on blending racing-derived technologies with everyday drivability. SRT vehicles emphasized superior power delivery, handling, and braking, setting them apart in the American muscle and luxury performance segments. Key engineering hallmarks of SRT models include high-output HEMI V8 engines, such as the supercharged 6.2-liter variant producing over 700 horsepower in select applications, paired with advanced adaptive suspension systems like Bilstein adaptive damping for precise cornering. Braking setups feature massive calipers and rotors—often six-piston fronts—for fade-resistant stopping power, while aerodynamic enhancements, refined through testing, incorporate active spoilers and diffusers to optimize and stability at high speeds. These features enabled SRT cars to deliver track-capable while remaining street-legal, prioritizing balanced tuning over raw power alone. Notable SRT models showcase this engineering prowess, including the SRT Hellcat, equipped with a supercharged 6.2-liter V8 generating 707 horsepower and accelerating from 0-60 mph in 3.6 seconds. The SRT utilized a 6.4-liter V8 with 475 horsepower, achieving 0-60 mph in 4.8 seconds while maintaining off-road capability through all-wheel drive and tuned . Similarly, the Chrysler 300 SRT8 featured a 6.4-liter HEMI V8 producing 470 horsepower, blending luxury with quarter-mile times around 13.5 seconds. SRT's performance credentials are underscored by benchmarks like the SRT10 ACR's Nordschleife lap time of 7:12.13, a record for production cars at the time. In , the SRT 170 established a quarter-mile record of 8.91 seconds at 151 mph for a production , highlighting SRT's dominance in straight-line acceleration. The division was disbanded in 2021 amid ' formation but revived in 2025 to spearhead high-performance development across , , , and brands. As of November 2025, the revived division is emphasizing advanced powertrains including hybrids and electrification for upcoming models.

Suter Racing Technology

Suter Racing Technology (SRT), founded in 1996 by former rider and his brother in Turbenthal, , specializes in the development of high-performance , engines, and electronic components for . Initially focused on project engineering for machinery, the company quickly gained prominence through innovations like the SuterClutch, a back-torque-limiting designed to reduce wheel hop and improve rider control during downshifts. SRT's early collaborations included supplying components and development support for Kawasaki's ZX-RR MotoGP bike between 2004 and 2006. In racing, SRT achieved significant success in the Moto2 class, securing three consecutive Constructors' World Championships from 2010 to 2012 with its MMX2 chassis, which powered teams to 96 podiums overall and contributed to Marc Márquez's 2012 Riders' title. The company's MotoGP involvement included a 2007 partnership with Engineering to build the X3 prototype, an 800cc V4 bike that competed in five rounds but struggled with reliability. Later, in 2012, SRT constructed aluminum chassis for the Claiming Rule Teams (CRT) category, supplying the Avintia Blusens team with S1000RR-powered machines ridden by Yuki Takahashi and , marking an entry into the premier class under cost-controlled regulations. Technically, SRT excelled in custom solutions, exemplified by the 2015 Suter MMX 500, a limited-edition 576cc four-cylinder two-stroke producing approximately 195 horsepower, featuring and a lightweight aluminum twin-spar frame for superior and handling. The firm also developed seamless-shift gearboxes and advanced systems for performance optimization, supplying these to various teams while emphasizing in-house production of critical components like swingarms and suspension linkages. Following its Moto2 dominance, SRT evolved from a full constructor to a key supplier in 2016, rebranding as Suter Industries to broaden into automotive prototypes, aviation engines, and defense applications while retaining racing product lines. This shift included patents on and technologies, enabling ongoing contributions to high-performance without direct racing entries post-2017.

Science and Technology

Subtitle File Format (.srt)

The .srt file format, short for SubRip Subtitle, is a plain text-based standard for storing video , including dialogue text and precise timing information for synchronization with video playback. Developed in 2000 as part of the free software for extracting from DVDs, it quickly became a due to its simplicity and ease of use in ripping and editing subtitle tracks from various media sources. The structure of an .srt file consists of sequential subtitle entries, each beginning with a numeric index starting from 1, followed by a line indicating the start and end times in the format HH:MM:SS,mmm --> HH:MM:SS,mmm (where HH represents hours from 00 to 99, MM and SS are minutes and seconds from 00 to 59, and mmm is milliseconds from 000 to 999), then one or more lines of subtitle text limited to about 32-42 characters per line for readability, and ending with a blank line to separate entries. This format supports basic HTML-like tags for styling, such as <b> for bold or <i> for italics, though these are optional and not universally rendered. Files are typically encoded in for support, allowing multilingual text including non-Latin scripts, although older implementations may default to Windows-1252. For example, a basic .srt entry might appear as follows: 
1
00:00:01,000 --> 00:00:04,000
Hello, world!
This indicates that the text "Hello, world!" should display from 1 second to 4 seconds into the video. One of the key advantages of the .srt format is its human-readable nature, enabling easy editing with any editor like , while maintaining broad compatibility across media players such as and editing tools like , which specialize in advanced subtitle authoring. It is also widely adopted for web-based streaming on platforms like , where users can upload .srt files directly for captioning videos, enhancing and searchability without requiring proprietary software. The format remains in its original Version 1 specification without formal versioning or updates, prioritizing backward compatibility over new features, which has ensured its longevity since 2000. While effective for basic timing and text, .srt lacks support for advanced positioning, animations, or font styling found in formats like Advanced SubStation Alpha (.ass), making it ideal for straightforward subtitle needs in both offline and online media distribution.

Secure Reliable Transport

Secure Reliable Transport (SRT) is an video transport protocol originally developed by Haivision in 2013 and released as in 2017. It builds on the (UDP) and incorporates (ARQ) mechanisms for error correction, enabling reliable delivery of live video streams over unpredictable networks such as the public . This architecture addresses common challenges like and , making SRT suitable for low-latency applications in and remote production. Key features of SRT include buffer-based latency control, configurable from 20 to 8000 milliseconds to balance between minimal delay and network resilience, AES-128/192/256 for secure transmission, and built-in and capabilities. These elements support high-quality even under adverse conditions, such as variable or high up to 10% without visible degradation. The protocol's packet structure consists of control packets for connection setup, acknowledgments, and negative acknowledgments (NAKs), alongside data packets that include 32-bit sequence numbers for ordering and retransmission requests, and 32-bit timestamps in microseconds for management via Timestamp-Based Packet Delivery (TSBPD). SRT has been adopted by major broadcasters for remote production workflows, including , which utilizes it for live event delivery over networks. It is integrated into popular open-source tools such as and FFmpeg, facilitating easy implementation in encoding and streaming pipelines. Performance evaluations demonstrate SRT's effectiveness in reducing jitter for high-resolution streams, supporting and 8K video transmission with near-complete packet recovery through ARQ and optional (FEC). As of 2024, 68% of broadcasters use SRT for live video transport, according to Haivision's Broadcast Transformation Report.

Source Routing Transparent Bridging

Source Routing Transparent Bridging (SRT) was defined in 1993 as part of the IEEE 802.1D standard amendments and IEEE 802.5m for Token Ring integration, enabling the interconnection of dissimilar LANs such as Ethernet and Token Ring networks without requiring source routing awareness from end stations. This approach combines elements of transparent bridging, which operates independently of frame routing information, with source-route bridging specific to Token Ring environments. Developed during the era when Token Ring and Ethernet coexisted in enterprise settings, SRT allowed bridges to support both frame types concurrently, facilitating mixed-media environments. The core mechanism of SRT bridging relies on transparent forwarding of frames using the to maintain a loop-free across the network. For Token Ring source-routed frames, identified by the routing information indicator (RII) bit set to 1 in the source address, the bridge employs source-route bridging logic while retaining the routing information field (); transparent frames (RII=0) are handled via standard learning and filtering without RIF involvement. When translating between Ethernet (using CSMA/CD access) and (token-passing), bridges reorder bits from non-canonical to canonical format and vice versa, ensuring compatibility without altering the RIF status for source-routed traffic. Key components include bridge ports operating in learning and filtering modes to dynamically build forwarding decisions, MAC address tables that store learned station addresses for efficient frame delivery, and built-in frame translation capabilities to adapt headers between media types. These elements allow SRT bridges to integrate 's with Ethernet's transparent model seamlessly. SRT bridging provided advantages in seamless integration for legacy mixed-LAN environments, enabling enterprises to connect and Ethernet segments without protocol modifications at the end stations, and it remained in use through the for such hybrid setups. However, it became obsolete in the post-2000s era with the widespread adoption of full Ethernet networks and the shift to switched architectures. Additionally, SRT lacks native support for virtual LANs (VLANs), which are addressed by the later standard.

Shuttle Radar Topography Mission

The (SRTM) was a collaborative project led by and the to produce high-resolution digital elevation models (DEMs) of Earth's land surface. Conducted from February 11 to 22, 2000, aboard the during mission , the SRTM deployed a (SAR) system to capture interferometric data for topographic mapping. The radar operated at C-band (5.6 cm wavelength) for broad coverage and X-band (3 cm wavelength) for higher resolution in select areas, enabling all-weather, day-night imaging unaffected by vegetation or cloud cover. The mission achieved near-global coverage of approximately 80% of Earth's land surfaces, spanning latitudes from 60°N to 56°S, with a horizontal resolution of 30 meters (1 arc-second) and vertical accuracy better than 16 meters. Data processing at NASA's Jet Propulsion Laboratory utilized interferometric techniques, where phase differences between signals from two antennas—one fixed and one on a 60-meter deployable —were analyzed to derive information. This resulted in two primary DEM products: SRTM30, a 1 arc-second (~30 m) grid for detailed , and SRTM90, a 3 arc-second (~90 m) version for broader applications. These DEMs support diverse applications, including geographic information systems (GIS) for , hydrological modeling for flood prediction, and environmental studies for assessment and erosion analysis. The data are freely available through the USGS EarthExplorer portal, facilitating global research and operational use. Initial challenges included data voids in areas with steep terrain or dense vegetation, which were addressed through void-filling techniques integrating ancillary datasets like and ICESat. Subsequent updates have enhanced the dataset's utility; in 2020, released NASADEM, a comprehensive reprocessing of the original SRTM using refined algorithms to eliminate voids, reduce artifacts, and improve absolute accuracy to around 6-10 meters in many regions. This version incorporates multi-source merging and phase unwrapping improvements, providing a seamless global product at 1 arc-second for advanced geospatial applications.

Shortest Remaining Time Scheduling

Shortest Remaining Time Scheduling (SRT), also known as Shortest Remaining Time First (SRTF), is the preemptive variant of the Shortest Job First (SJF) algorithm used in operating systems for CPU process scheduling. Developed in the 1960s for systems, it selects the process from the ready queue that has the smallest estimated remaining CPU burst time for execution, aiming to minimize average waiting time and improve system responsiveness. This approach is grounded in , where it is proven optimal for reducing mean response time in single-server queues with known service times. The algorithm operates by maintaining a ready ordered by increasing remaining burst times, updated upon arrival or completion. At any scheduling point, if a new arrives with a shorter remaining time than the currently running , the scheduler preempts the running and dispatches the new one. This requires accurate predictions of burst times, often estimated via exponential averaging of past CPU usage (e.g., \tau_{n+1} = \alpha t_n + (1 - \alpha) \tau_n, where \alpha is a weighting factor between 0 and 1). Consider an example with processes arriving at different times: P1 (arrival 0, burst 8), P2 (arrival 1, burst 4), P3 (arrival 2, burst 9), P4 (arrival 3, burst 5). Under , the execution order preempts as follows: P1 runs from 0 to 1, then P2 from 1 to 5, P4 from 5 to 10, P1 resumes from 10 to 17, and P3 from 17 to 26. Waiting times are 9 for P1, 0 for P2, 15 for P3, and 2 for P4, yielding an average of 6.5 units—lower than the 7.0 units for non-preemptive on the same set. In a simpler case with all arrivals at time 0 and bursts of 8, 4, 1, and 5, achieves an average waiting time of 4 units versus 8.25 units under . SRT excels in minimizing average waiting time and thus (completion minus arrival) and response time, making it theoretically optimal among work-conserving disciplines for these metrics when burst times are known. However, it risks for long jobs if short ones continually arrive, as longer processes may indefinitely wait. To address this, integrate aging, gradually increasing priority for waiting processes based on elapsed time to ensure fairness. SRT and its have been implemented in certain Unix for interactive workloads and in operating systems like , where predictable burst estimates enable efficient scheduling in embedded environments.

Transportation

State Railway of Thailand

The State Railway of Thailand (SRT) is the state-owned national railway operator under the Ministry of Transport, responsible for managing Thailand's primary rail network for both passenger and freight services. Established in 1890 as the Royal State Railways of Siam under the Department of Public Works during the reign of King Chulalongkorn, the SRT marked the formal beginning of organized railway operations in the country, with the first line from Bangkok to Nakhon Ratchasima opening in 1896. Over the decades, it evolved into a state enterprise in 1951 through the State Railway of Thailand Act, expanding to connect major regions and support economic development. The SRT manages a network of 4,045 km of 1,000 mm meter-gauge track, primarily single-track, serving 47 provinces and facilitating intercity connectivity. Key routes include the , spanning 751 km from to ; the Northeastern Line, extending 627 km to near the border; and the Southern Line, the longest at 1,144 km, reaching the Malaysian border via Padang Besar and .) Operations encompass passenger services, such as sleeper trains on long-distance routes with a maximum speed of 100 km/h, and of commodities like from northern and northeastern mills to markets, as well as for power plants. initiatives began in 2020, including the SRT Red Line commuter service integrating with Bangkok's metro system to enhance urban mobility. The SRT faces challenges from aging infrastructure, including outdated tracks, signaling, and , which limit efficiency and reliability, compounded by intense competition from expanded highway networks that have eroded rail's . To address these, a project with is under construction as of 2025, with the 253 km to segment (Phase 1) approximately 45% complete and designed for 250 km/h operations, expected to open in 2029 as part of a broader northeastern corridor to . Ongoing double-tracking projects and cross-border connections, such as with , are expanding the network. Economically, the SRT transported approximately 30 million passengers and 13 million tons of freight annually as of 2024, underscoring its role in supporting regional trade and while remaining fully government-owned.

Short Range Transport Aircraft

Short Range Transport Aircraft (SRT) refer to a category of fixed-wing optimized for tactical operations over distances less than 1,000 km, typically carrying payloads between 5 and 20 tons of troops, equipment, or supplies. These aircraft evolved from World War II-era designs such as the , which served as a foundational troop and cargo carrier with short-field capabilities, influencing subsequent generations focused on rapid deployment in austere environments. Key examples include the U.S. Army's , a twin-turboprop utility transport capable of carrying up to 19 passengers or a 3,175 kg over approximately 800 km, emphasizing its role in intra-theater . Modern developments include unmanned systems for complementary missions. These platforms feature short takeoff and landing () performance, enabling operations from unprepared airstrips as short as 300 meters, with cruising speeds of 300-500 km/h, making them ideal for insertions and extractions. Historically, SRT aircraft played critical roles in logistics, where models like the facilitated troop movements and supply drops on rugged terrain. In contemporary use, they support exercises for rapid force projection and disaster relief efforts, such as delivering aid to remote areas post-natural disasters. Ongoing developments include 2025 hybrid-electric prototypes, like Electra.aero's EL-2 demonstrator, which integrate blown-lift technology with electric propulsion for reduced emissions and enhanced autonomy in short-range missions.

Other Uses

Special Response Team

A Special Response Team (SRT) refers to elite tactical units within law enforcement and military organizations, designed to handle high-risk operations that exceed the capabilities of standard patrol forces. These teams emerged in response to escalating threats like urban unrest, sniper incidents, and in the mid-20th century. In the United States, notable examples include the Federal Bureau of Investigation's (FBI) (HRT), established in 1983 as the nation's first full-time federal counterterrorism tactical unit to address gaps exposed by events such as the 1972 Olympics massacre. Similarly, the Police Department's (LAPD) Special Weapons and Tactics () unit, formed in 1966 following the Texas Tower sniper attack and , pioneered specialized tactics for violent confrontations and has influenced SRT development nationwide. Training for SRT members is intensive and multifaceted, typically spanning 6 to 12 months for initial selection and , with ongoing monthly sessions to maintain proficiency. Core skills include (CQB) techniques for room clearing and dynamic entries, advanced marksmanship for precision engagements, and breaching to access fortified structures, and tactical response for on-scene casualty care. Additional certifications often cover hazardous materials (HAZMAT) handling for chemical or biological threats and operations for long-range overwatch. For instance, the FBI HRT's selection process involves a grueling physical and skills assessment, followed by a comprehensive emphasizing these competencies to ensure operators can deploy in diverse environments, from urban settings to maritime scenarios. SRT missions primarily focus on high-risk warrant service, hostage rescues, and operations, where rapid intervention minimizes casualties and neutralizes threats. A prominent U.S. example is the FBI HRT's role in the 1993 , where the team supported negotiations and executed a tactical insertion during the 51-day standoff with the Branch Davidian compound, though the operation ended tragically with 76 deaths. Globally, the United Kingdom's (SCO19), operational since 1966, handles armed response to terrorism and public order incidents, while Israel's unit, part of the Border Police, specializes in raids and hostage extractions in urban areas. Standard equipment includes compact submachine guns like the for close-range firepower, ballistic shields for team advances under fire, and breaching tools for forced entry. Since the , 2001, attacks, SRT units have expanded significantly, with increased funding and integration of advanced technologies to counter evolving threats. Post-9/11 reforms led to more widespread adoption of tactical teams across federal, state, and local agencies, enhancing capabilities for . Recent adaptations include integration for reconnaissance and in operations, allowing teams to assess risks without direct exposure. By 2024, training emphases have shifted toward cyber-physical threats, such as hybrid attacks combining digital intrusions with physical violence, as highlighted in assessments of domestic and nation-state .

Sex Reassignment Therapy

Sex reassignment therapy (SRT), also known as gender-affirming care, serves as an umbrella term for a range of medical, surgical, and psychological interventions designed to align an individual's physical sex characteristics with their , thereby alleviating . This process typically includes (), gender-affirming surgeries, and supportive counseling, with protocols guided by the World Professional Association for Transgender Health (WPATH) Standards of Care, first established in 1979 and periodically updated to reflect evolving evidence. The WPATH guidelines emphasize individualized, multidisciplinary care involving professionals, endocrinologists, and surgeons to ensure and optimal outcomes. The therapy progresses through distinct stages, beginning with an initial assessment phase that often requires 6-12 months of and counseling to confirm persistent gender incongruence and explore treatment goals. Following this, is initiated, involving and anti-androgens for transfeminine individuals or testosterone for transmasculine individuals, with noticeable physical effects such as or voice deepening typically emerging within 3-6 months. Surgical options, including for transfeminine patients or for transmasculine patients, are considered after at least one year of in many protocols, with satisfaction rates reported between 70% and 90% among recipients. SRT has been shown to significantly reduce symptoms of and improve overall , though it carries risks such as due to hormonal effects on reproductive function and an elevated incidence of , particularly with therapy in transfeminine individuals. In the United States, to these treatments expanded following the 2015 ruling on , which facilitated spousal insurance coverage and reduced barriers for individuals. Globally, SRT is legally available in over 20 countries, including , , and several European nations, with variations in age restrictions and requirements for surgical approval. In 2019, the (WHO) declassified gender incongruence as a in the , moving it to a chapter on sexual conditions to reduce while maintaining to care; this change took effect in 2022. Supportive elements of SRT often include non-surgical interventions such as voice therapy to modify pitch and resonance for better congruence, and or hair removal to address facial or incongruence. Long-term studies indicate that comprehensive SRT leads to improved in approximately 80% of cases, with reductions in , anxiety, and suicidality persisting years after treatment.

Seattle Repertory Theatre

The Seattle Repertory Theatre, commonly known as Seattle Rep, was founded in 1963 as a professional resident theater company in Seattle, Washington, inspired by the cultural momentum of the 1962 and led initially by founding artistic director Stuart Vaughan. The organization has since grown into one of the largest nonprofit theaters in the , housed at with its primary venue, the Bagley Wright Theatre, a house that opened in 1983 and features 673 seats. Over the decades, Seattle Rep has been guided by a succession of artistic directors, including Allen Fletcher (1966–1970), W. Duncan Ross (1971–1979), Daniel Sullivan (1981–1993), Sharon Ott (1990–2000), David Esbjornson (2005–2008), and the current leader, Dámaso Rodríguez (2016–present), whose tenures have emphasized a balance of classical repertoire and contemporary innovation. Seattle Rep's programming blends timeless works by playwrights such as Shakespeare with world premieres and new commissions, typically mounting six to seven mainstage productions per season across its Bagley Wright and Leo K. theaters. Notable recent examples include the 2022 world premiere of Bruce, a musical exploring the behind-the-scenes chaos of the film Jaws, and adaptations like No-No Boy (workshopped in 2023), which highlights Asian American experiences through the story of Japanese American incarceration during World War II. Under Rodríguez's direction, the theater has prioritized diverse voices, commissioning and producing works by underrepresented artists to reflect Seattle's multicultural population, including explorations of identity, resilience, and social justice. The theater's achievements include the 1990 Tony Award for Outstanding Regional Theatre, recognizing its contributions to American drama, and extensive education initiatives through Seattle Rep Studios, which serve over 5,000 students annually via student matinees, residencies, and workshops to foster lifelong engagement with the arts. In recent years, amid post-COVID recovery, Seattle Rep adopted a 2024–2027 strategic plan focused on sustainable producing models, community building, and balanced programming, operating on an approximately $16 million annual budget supported by earned income, , and public funding.

Short-Term Residential Treatment

Short-term residential treatment (SRT) programs provide brief inpatient care aimed at stabilizing individuals experiencing acute mental health challenges or substance use disorders, facilitating initial recovery steps in a structured environment. These programs typically last 30 days or less, aligning with definitions from the Substance Abuse and Mental Health Services Administration (SAMHSA) and the National Survey of Substance Abuse Treatment Services (N-SSATS). They are commonly utilized for substance abuse, depression, and trauma-related conditions, following U.S. models guided by SAMHSA's treatment standards and the American Society of Addiction Medicine (ASAM) criteria for level 3 care, which emphasizes 24-hour structured support. The daily structure of SRT involves intensive therapeutic activities, including group therapy sessions, medication management for stabilization, and training to promote independence and prevention. Participants receive round-the-clock in secure facilities, such as halfway houses or dedicated residential centers, to address immediate concerns and foster behavioral changes. This comprehensive approach ensures a transition from to outpatient care, with activities tailored to individual biopsychosocial needs. Research demonstrates the efficacy of SRT, with studies showing a 40-60% rate during —comparable to rates for other conditions—indicating substantial risk reduction relative to untreated outcomes, where approaches 80-95%. These programs often integrate () for skill-building and 12-step models for peer support and long-term sobriety maintenance, as seen in influential approaches like the 28-day Model. Access to SRT has expanded since the 2008 Mental Health Parity and Addiction Equity Act (MHPAEA), which requires health insurers to cover mental health and treatments, including residential services, at with medical benefits. By 2025, hybrid models blending in-person care with for follow-up have become standard, extending support beyond discharge while complying with extended Medicare flexibilities for behavioral health. SRT programs place a strong emphasis on those with co-occurring disorders, where integrated treatment addresses both and substance use simultaneously to improve overall outcomes.