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Suspension

Suspension, in , denotes the of a or following pronouncement of , involving rapid cooling to cryogenic temperatures using cryoprotectants to minimize cellular damage in anticipation of potential future revival via advanced or . This practice, pioneered in the , aims to preserve neurological structure as a hedge against irreversible , predicated on the causal premise that —total loss of personal identity encoded in patterns—can be averted if intervention occurs before complete decay. Key organizations facilitating suspension include the , which has preserved over 260 individuals as of 2025, and , emphasizing techniques to form glass-like states reducing formation. Empirical progress includes improved protocols minimizing ischemia, yet no verified revivals exist, with critics highlighting thermodynamic and informational barriers to reversal, though proponents counter that dismissal often stems from institutional conservatism in academia and media, which systematically underrate speculative interventions absent current proof. Defining controversies encompass ethical debates over resource allocation for low-probability outcomes and early procedural failures, such as inadequate stabilization leading to degraded cases, underscoring the field's reliance on first-responder and legal navigation post-cardiac . Costs typically range from $28,000 for neuro-only to $200,000 for whole-body, funded via , reflecting a calculated wager on exponential technological growth outpacing biological decay.

Science and Engineering

Chemical Suspensions

In chemistry, a suspension is a heterogeneous mixture in which solid particles, typically larger than 1 micrometer (1000 nanometers) in diameter, are dispersed throughout a medium such as a or gas, but remain undissolved and settle out under the influence of upon standing. Unlike true solutions, where solute particles are molecular or ionic in size (less than 1 nanometer) and do not separate, or colloids, where dispersed particles range from 1 to 1000 nanometers and exhibit stability against rapid settling while scattering light via the , suspensions feature visibly larger particles that can often be separated by simple . The behavior of particles in suspensions is primarily governed by gravitational sedimentation, as described by Stokes' law, which quantifies the terminal settling velocity v of a spherical particle: v = \frac{2}{9} \frac{(\rho_p - \rho_f) g r^2}{\eta}, where \rho_p and \rho_f are the densities of the particle and fluid, respectively, g is gravitational acceleration, r is the particle radius, and \eta is the fluid viscosity. This equation demonstrates that settling rate increases with larger particle size (proportional to r^2) and density difference, but decreases with higher viscosity; suspensions thus appear opaque or turbid due to light scattering by the coarse particles and lack the optical clarity of solutions. Stability is limited without additives, leading to either flocculated systems—where particles aggregate loosely and settle as easily redispersible sediment—or deflocculated ones, where electrostatic repulsion causes compact, hard-to-redisperse cakes; factors like surfactants or polymers can modulate these states to control aggregation and resuspension. Suspensions are prepared via techniques, such as milling or high-shear mixing to reduce coarse solids into fine particles, or methods like to form the dispersed directly in the . In pharmaceutical contexts, particle sizes are optimized to 1–50 micrometers for oral suspensions to balance and pourability, while parenteral forms require sterility and sizes below 1 millimeter to minimize injection risks; examples include in antacids or insoluble antibiotics like penicillin G, where suspension enhances over forms. Industrial applications extend to paints, where pigments suspend in binders for uniform coating; inks; and ceramics processing, with natural examples like muddy water illustrating rapid settling of particles exceeding 1 micrometer.

Mechanical Suspensions in Vehicles and Structures

Mechanical suspension systems in and structures serve to support loads, isolate vibrations, and permit controlled relative motion between components, thereby enhancing , comfort, and . In , these systems link the wheels to the or frame, absorbing road-induced and maintaining tire-road contact for traction and handling. Key components include linkages (such as control arms and bars), springs (for load support and deflection), and dampers ( absorbers for energy dissipation). Vehicle suspensions are classified as dependent, semi-dependent, or based on wheel interconnection. Dependent systems, like rigid () axle suspensions, connect wheels via a fixed , constraining their motion together for simplicity and load capacity in heavy-duty applications such as trucks. suspensions, conversely, allow each to move separately via linkages like double wishbone or multi-link setups, improving ride quality and cornering by reducing body roll and unsprung mass effects. Common spring types include leaf springs (layered for durability in vehicles), coil springs (helical for cars), torsion bars (twisting rods for compact packaging), and air springs (pneumatic for adjustable height and load leveling in luxury or fleets). Dampers, often hydraulic or gas-charged, control spring to prevent excessive bouncing, with advanced active systems using sensors and actuators for real-time adjustment in performance vehicles. In structures, mechanical suspensions primarily address from like HVAC units or generators, preventing transmission to the building via isolators such as mounts or rubber pads that decouple forces. These systems employ elastic elements (springs) and viscous dampers to achieve natural frequencies below excitation sources, typically 3-5 Hz for , reducing structural and . For seismic resilience, base suspensions use high-damping rubber bearings or sliding pendulums to elongate periods, dissipating without rigid transfer to the . Suspension principles also underpin bridge designs, notably suspension bridges, where the deck hangs from vertical suspenders attached to main cables draped over towers and anchored at ends, converting vertical loads into cable tension for spanning distances up to 2 kilometers without intermediate supports. The parabolic cable shape under uniform loading distributes forces efficiently, with towers bearing compression and anchors resisting pull-out, enabling economical construction for long spans like the 1,995-meter Akashi Kaikyō Bridge completed in 1998. Wind and traffic-induced vibrations are mitigated through aerodynamic deck shapes and tuned dampers, ensuring dynamic stability.

Mathematics

Suspension in Topology and Geometry

In , the suspension of a X, denoted SX, is constructed as the quotient space (X \times [0,1]) / \sim, where the \sim identifies all points in X \times \{0\} to a single and all points in X \times \{1\} to a distinct . This unreduced suspension endows the resulting space with two distinguished points, the poles, and preserves the topological structure of X along the "equator" X \times \{1/2\}. Geometrically, it corresponds to forming a cylindrical product and contracting each boundary (or face, for higher-dimensional analogs) to a , yielding a space that embeds X as a cross-section midway between the poles. For based (pointed) topological spaces (X, x_0), the reduced suspension \Sigma X refines this by further quotienting the unreduced suspension along the basepoint fiber \{x_0\} \times [0,1], collapsing it to the south pole (or equivalently, using the smash product \Sigma X = S^1 \wedge X). This ensures \Sigma X inherits a canonical basepoint at the south pole and is homotopy invariant under basepoint choice for path-connected X. A key example is the suspension of the n-sphere: \Sigma S^n \simeq S^{n+1}, where the equatorial S^n generates the higher-dimensional sphere via meridional paths connecting the poles. Similarly, suspending an n-dimensional cube yields an (n+1)-cube, illustrating recursive dimensionality increase. In , the suspension functor \Sigma induces a suspension homomorphism on homotopy groups \pi_k(X, x_0) \to \pi_{k+1}(\Sigma X), which is an isomorphism when X is (n-1)-connected and k < 2n-1, by the Freudenthal suspension theorem (established in 1940s work on stable homotopy ranges). Geometrically, this reflects how suspension "stabilizes" by adding degrees of freedom, facilitating computations in ; for instance, iterated suspensions relate to the stable , where \pi_k^S \cong \colim_n \pi_{k+n}(S^n). The double suspension theorem further asserts that any triangulable is a double suspension of some , embedding geometric realizations into homotopy types via suspensions. These properties underscore suspension's role in bridging point-set topology with geometric and homotopical invariants, without reliance on auxiliary structures like cell decompositions for basic definitions.

Administrative and Disciplinary Actions

Suspensions in Education

Suspensions in education constitute a disciplinary measure involving the temporary removal of students from their regular instructional environment due to violations of school rules or policies, aimed at preserving a safe and orderly learning atmosphere. These actions typically address behaviors such as fighting, possession of weapons or drugs, disruption, or . Common forms include in-school suspension (ISS), where students remain on campus but are isolated from regular classes for supervised reflection or remedial work, and out-of-school suspension (OSS), which excludes students from school premises entirely, often without instructional continuity. Short-term suspensions last up to 10 days, while longer ones may approach expulsion thresholds and require heightened procedural safeguards. In the United States, the constitutional basis for student in suspensions stems from the Court's ruling in Goss v. Lopez (1975), which affirmed that public school students possess a property interest in and a liberty interest in , entitling them to notice of charges and an opportunity to respond before suspensions of 10 days or less. For longer suspensions, formal hearings are mandated to prevent arbitrary deprivation of rights under the . This decision balanced school administrative efficiency with protections against erroneous discipline, though compliance varies, with some districts facing litigation over inadequate notice or bias claims. Prevalence data from the U.S. Department of Education's Civil Rights (CRDC) for 2020-21 indicate that OSS affected about 3% of K-12 students overall, with students comprising 15% of those receiving OSS despite representing 8% of , and Black boys facing rates three times higher than white boys for similar infractions. American Indian/Alaska Native students also show elevated rates at 12% for OSS among disciplined students. These disparities persist across income levels, with Black students in low-poverty schools suspended at rates up to 5.3 times those of white peers, prompting debates over behavioral differences versus in enforcement. Government datasets like CRDC provide raw incidence figures but often lack controls for infraction severity, leading some analyses to attribute gaps to higher rates of objective misbehaviors like rather than subjective alone. Empirical research, including a 2015 meta-analysis of 34 studies encompassing 53 cases, reveals a significant negative between suspensions and key outcomes: each suspension predicts lower (effect size r = -0.17), reduced (r = -0.13), and increased likelihood of future suspensions (r = 0.25), with no of improved or . Longitudinal studies further link OSS to heightened dropout risks, juvenile justice involvement, and internalizing problems like anxiety, as exclusion disrupts learning continuity without addressing root causes of . On , controlled evaluations find suspensions fail to deter ; for instance, suspended students exhibit 50% higher repetition of violent acts in follow-ups, and school-wide OSS rates correlate with elevated peer misbehavior rather than reductions. These findings challenge the deterrent rationale, suggesting suspensions may exacerbate and academic disengagement, particularly for at-risk groups, though peer-reviewed causal analyses remain limited by factors like prior .

Suspensions in Employment and Licensing

Suspension in refers to the temporary removal of an employee from their duties and , typically pending an into alleged , deficiencies, or concerns, and may or may not include pay. This action serves as an interim measure in progressive discipline processes, allowing employers to mitigate risks while gathering evidence, but it must comply with laws to avoid claims of unfair treatment or . In the United States, federal agencies imposed 10,249 suspensions for employee in 2016, reflecting its use as a disciplinary tool short of termination. Employers are required to document reasons clearly, provide notice where mandated by or statute, and ensure the duration is reasonable—often limited to the period—to prevent claims. Procedures for employment suspensions vary by jurisdiction and employment type but generally involve notifying the employee in writing of the reasons, duration, and conditions for return, while restricting access to company resources to preserve evidence integrity. For federal employees, suspensions without pay exceeding 14 days trigger appeal rights under the Merit Systems Protection Board, emphasizing due process protections against arbitrary action. Private sector suspensions, absent union contracts or specific state laws, offer fewer formal safeguards, though courts have upheld them when tied to legitimate business interests like preventing further harm or tampering. Misapplication, such as indefinite suspensions without cause, can lead to wrongful suspension lawsuits, particularly if motivated by protected activities like whistleblowing. In professional licensing, suspension entails the temporary of to in regulated fields such as , , or , imposed by licensing boards to protect public welfare amid investigations into incompetence or ethical breaches. Common grounds include , impairing judgment, criminal convictions unrelated to practice but indicative of flaws, and fraudulent documentation. For physicians, violations like or inadequate record-keeping have prompted suspensions; state medical boards processed thousands of such actions annually, with administrative processes allowing summary suspensions in imminent harm cases before full hearings. Lawyers face similar scrutiny from bar associations for like client fund , where suspensions often precede if patterns persist. Licensing suspension procedures typically involve complaint filing, board investigation, notice to the licensee, and an evidentiary hearing, with appeals available through administrative or judicial review to ensure procedural fairness. Unlike employment suspensions, these carry broader implications, barring practice entirely and requiring reinstatement petitions after remediation, such as sobriety programs or ethics training. In 1997, a federal review found U.S. states employed varied administrative and judicial mechanisms for healthcare license suspensions, prioritizing swift action for public safety over prolonged delays. Failure to report suspensions across jurisdictions can exacerbate penalties, underscoring the interconnected regulatory framework.

Suspensions in Sports

In sports, suspensions refer to temporary or indefinite prohibitions on athletes, coaches, teams, or officials participating in competitions, imposed by governing bodies to enforce rules against misconduct such as use, on-field violence, violations, or ethical breaches. These penalties aim to preserve competitive integrity, player safety, and public trust, with durations ranging from one game to lifetime bans depending on severity and . For instance, first-time PED violations in (MLB) typically result in 80-game unpaid suspensions, escalating to 162 games for second offenses and lifetime bans for third. Leagues like the (NFL) and (NBA) calibrate penalties based on empirical evidence of harm, such as gambling's potential to undermine match outcomes, leading to indefinite suspensions with minimum terms like two years for NFL players betting on league games. Suspensions arise from diverse infractions, with doping representing a core threat due to its causal distortion of natural athletic ability. Historical cases include Canadian sprinter Ben Johnson's 1988 Olympic stripped and two-year ban for use, later extended to life after a 1993 relapse, highlighting the International Association of Athletics Federations' (IAAF) zero-tolerance for repeated violations. Violence triggers shorter bans focused on deterrence; the NBA's 2024 guidelines suspend players for 1-3 games post-ejection for flagrant fouls, as seen in Draymond Green's multiple one-game absences for striking opponents. scandals have intensified post-2018 U.S. legal expansions, with the suspending six players indefinitely in 2023-2024 for betting on games via unauthorized channels, enforcing a policy rooted in preventing conflicts of interest. Decision processes vary by league but emphasize investigation, evidence review, and proportionality. In the , the or disciplinary officers impose penalties after reviewing footage, witness statements, and medical data, with appeals heard by an independent NFL-appointed officer who examines the full record without deference to the initial ruling. The NBA vests authority in the commissioner under Article 24 of its , allowing suspensions for "conduct detrimental to ," as in the 25-game ban for in 2023 over off-court gun incidents. International bodies like or the (WADA) use tribunals with appeals to the (), where panels of three arbitrators—selected by parties and division president—resolve disputes based on for doping. Notable cross-sport examples underscore enforcement rigor. MLB's 2013 Biogenesis probe yielded Alex Rodriguez's 211-game suspension (reduced to 162 on appeal) for PED involvement, the longest non-lifetime ban in league history. In soccer, FIFA banned Ecuador's indefinitely in 2024 for fabricated birth documents, impacting national team eligibility. Lifetime bans, rare but definitive for irreparable integrity breaches, include MLB's in 1989 for betting on games as player-manager, upheld despite appeals denying reinstatement. These measures, while occasionally contested for inconsistencies—such as varying appeal success rates across leagues—prioritize verifiable causation over subjective intent to sustain empirical fairness.

Music and Harmony

Suspension as a Non-Chord Tone

A suspension is a type of non-chord tone in which a chord tone from a preceding is retained into the following , producing a dissonance that resolves downward by step to a chord tone of the new . This creates tension through the clash between the suspended note and the underlying , typically occurring on a strong , unlike many other non-chord tones that appear on weaker beats. The structure involves three phases: preparation, where the note is as part of the prior ; suspension, where it becomes dissonant against the new ; and , where it moves stepwise down to consonance. Suspensions are classified by the intervals involved, such as the common 4-3 suspension, where a fourth above the in the prior (e.g., a ) suspends into the new as a dissonant fourth before resolving to a third. Other frequent types include the 9-8 (ninth resolving to ), 7-6 (seventh to sixth), and 2-1 (second to ), often tied from the preparation via a note value extension like a into a resolution in common time. In practice, suspensions embellish harmonic progressions, particularly in cadences or dominant-to-tonic motions, enhancing expressivity; for instance, a 4-3 suspension over a resolving to I underscores the motion from dominant to . They differ from appoggiaturas by their tied preparation, ensuring the dissonant note derives directly from prior consonance rather than leaping to it. In tonal harmony of the (roughly 1600–1900), suspensions systematized dissonance treatment, building on where similar held dissonances appeared but without strict stepwise or norms. Composers like Bach and Handel employed them extensively for contrapuntal depth, as in fourth-species where suspensions form the core of note-against-note dissonance resolving on the beat. Modern analysis views suspensions as prolonging underlying harmony, with the dissonant interval temporarily delaying completion, supported by perceptual studies linking their to reduced via alignment. Unresolved suspensions, though rare in strict , occur in for effect, termed "hanging" or appoggiatura-like but retaining the preparation tie.

Cultural and Conceptual Uses

Suspension of Disbelief

Suspension of disbelief refers to the audience's deliberate temporary acceptance of fictional elements as plausible, setting aside real-world to engage with a . The concept was coined by English poet and philosopher in his 1817 work , where he described it as a "willing for the moment, which constitutes poetic faith," achieved through human interest and a semblance of truth sufficient to make even tales believable. This mechanism enables immersion in stories that defy empirical reality, provided the narrative maintains and evokes emotional or intellectual resonance. For to hold, creators must establish coherent rules within the fiction's universe, avoiding arbitrary inconsistencies that disrupt causal logic or character motivations, as violations can prompt audiences to revert to critical analysis. Empirical studies using , such as fMRI scans during , suggest this process involves reduced activity in regions associated with , akin to empathy-driven formation, rather than passive ignorance of flaws. In practice, it demands precise world-building: for instance, in speculative genres, physical laws may bend but must follow predictable consequences to sustain , mirroring first-principles adherence within contrived premises. The term applies across literature, theater, film, and other media, as in Coleridge's The Rime of the Ancient Mariner (1798), where spectral ships and albatross curses are accepted due to the mariner's vivid psychological torment and moral causality. Similar dynamics operate in modern , where travel is tolerated if governed by defined mechanics, or , where anachronisms are overlooked amid authentic human drama. Failure to evoke this suspension—through plot holes, unmotivated actions, or tonal shifts—results in disengagement, underscoring that the audience's "willingness" is conditional on the work's structural integrity rather than blind faith. Critiques highlight limitations, arguing the phrase overemphasizes audience passivity; instead, engagement often involves active belief construction via narrative cues, not mere disbelief suppression. Overreliance on the concept can rationalize sloppy craftsmanship, as inconsistent elements strain immersion regardless of intent, potentially eroding the fiction's persuasive power. In truth-seeking analyses, while valuable for artistic exploration, suspension does not negate the need for narratives to respect causal internally, lest they forfeit intellectual appeal beyond superficial .

Erotic Suspension

Erotic suspension involves the insertion of metal hooks through temporary piercings in the skin, followed by attachment to rigging systems that lift the participant's body off the ground, typically for durations of several minutes to an hour, pursued for erotic, sensory, or transcendent experiences. This practice, distinct from rope-based bondage, relies on the body's flesh to bear weight, distributing load across multiple hooks placed in areas with sufficient dermal thickness, such as the upper back, chest, or limbs. Participants often report intense physical sensations transitioning to euphoria or altered states of consciousness, attributed to endorphin release and psychological dissociation from pain. The modern iteration emerged in the mid-20th century, pioneered by (born Roland Loomis in 1930), who conducted his first flesh-hook suspension around 1966–1967, drawing inspiration from ethnographic accounts of Native American rituals like the Okipa ceremony. , influenced by imagery of tribal piercings and suspensions, integrated these into Western culture, coining the term "Modern Primitives" in 1979 to describe the revival of ancient practices for personal transformation. By the , he taught techniques to others, fostering communities that adapted suspensions for erotic and performance contexts, though origins trace to indigenous rites worldwide, including Sunni and Hindu traditions involving skin hooks for or quests. Techniques vary by suspension type, such as the "" position (face-down, hooks in back and legs) or "coma" (upright, hooks in chest and knees), requiring precise hook placement to avoid vital structures like or organs, with 6– gauge hooks typically used to minimize tearing. employs rated hardware like carabiners and pulleys secured to structural anchors capable of supporting over 1,000 pounds, with participants gradually loaded to assess integrity before full . Experienced practitioners emphasize sterile procedures, including autoclaved hooks and skin prep, to mitigate risks, which remain the primary concern despite low incidence in controlled settings. Health risks include excessive bleeding, fainting from vasovagal response, tissue laceration from overload, and rare nerve damage if hooks impinge on underlying , with prolonged suspension exacerbating akin to suspension trauma. Safety protocols mandate spotters for immediate lowering, vital sign monitoring, and post-session , with novices advised against solo attempts due to the steep in and physics. While some medical observers note potential therapeutic benefits like pain threshold expansion, empirical data on long-term effects is sparse, limited to anecdotal reports from subcultural participants rather than controlled studies.

Economic and Financial Contexts

Suspension of Trading and Payments

Suspension of trading encompasses temporary halts imposed on the exchange of securities to preserve market integrity amid extreme price swings, pending material disclosures, or regulatory scrutiny. In the United States, the possesses statutory authority under Section 12(k) of the to suspend trading in any security for up to 10 business days when necessary to protect investors, typically invoked for issues such as potential , manipulative practices, or insufficient public information. Individual stock halts, distinct from market-wide measures, occur frequently; for example, the SEC suspended trading in over 200 securities in 2023 alone due to concerns over microcap or delisting risks. Market-wide circuit breakers serve as automated safeguards against cascading sell-offs, triggering pauses across U.S. exchanges based on declines in the Index from its prior close: a 7% drop (Level 1) or 13% drop (Level 2) halts trading for 15 minutes if occurring between 9:30 a.m. and 3:25 p.m. ET, while a 20% drop (Level 3) closes markets for the day. These rules, formalized by the in 1988 following the crash of October 19, 1987—when the plunged 22.6%—aim to facilitate information dissemination and orderly reassessment rather than permanently altering prices. Notable activations include four Level 1 triggers during the week of March 9–16, 2020, amid COVID-19-induced volatility, which temporarily stabilized futures and equity trading but highlighted limitations in preventing after-hours disruptions. Suspensions extend to specific firms during crises, as seen in the Enron scandal: trading in Corporation shares halted on November 8, 2001, after revelations of accounting irregularities inflated assets by billions, precipitating the company's filing days later. Internationally, exchanges like the suspend listings for delayed financial reporting or auditor-detected fraud, with over 100 suspensions in 2023 tied to short-seller probes or whistleblower alerts. Such measures, while curbing immediate losses, can signal deeper insolvency risks, as evidenced by the 2015 Chinese market turmoil where half of listed firms suspended trading to avert further declines during a 30%+ index drop. Suspension of payments involves temporary deferrals of financial obligations, often via moratoriums, to mitigate strains during economic distress without immediate defaults. In contexts, the G20's Debt Service Suspension Initiative (DSSI), initiated April 15, 2020, paused official bilateral debt payments for 73 low-income countries through December 2021, freeing $12.9 billion for responses while requiring IMF-World Bank program participation to ensure fiscal transparency. Banking moratoriums similarly defer principal and interest on loans; for instance, India's 2020 scheme under the Reserve covered 3-6 month holidays for retail and corporate borrowers, though deferred amounts accrued interest, elevating total indebtedness by an estimated 1-2% of GDP. In , Chapter 11 filings in the U.S. automatically impose an "automatic stay" suspending creditor payments and collections, as in ' September 15, 2008, filing amid the global , which halted $613 billion in obligations to facilitate . These suspensions prioritize systemic stability over immediate creditor rights but risk , as deferred payments often compound via interest, prolonging recovery; empirical analyses of European COVID moratoriums indicate they preserved short-term liquidity but increased non-performing loans by 20-30% post-expiration. Regulators like the have cautioned that indiscriminate moratoriums can mask underlying credit risks, advocating targeted application to viable borrowers only.

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