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Natural Sciences236
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روشآمار1,836هوش مصنوعی و یادگیری ماشین1,661علوم تصمیم932روش‌های پژوهش1,354اندازه‌گیری1,745علّیت و شواهد532عمل پژوهشی118
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روش‌های واقعیِ منطبق با فیلتر شما.
مرتب‌سازیمحبوبیتالف–یی–الفجدیدترین
spectroscopy

Cyclic Voltammetry

Cyclic Voltammetry (CV) is an electrochemical technique that measures redox reactions by varying the voltage applied to an electrode and monitoring the resulting current. Developed by Nicholson and Shain in 1964, CV is one of the most widely used electrochemical methods, providing rapid information about the redox pote

2 منبع1964
food science

D-Value and Z-Value

D-value (decimal reduction time) and Z-value characterize the thermal resistance of microorganisms in food. D-value is the time required at a specific temperature to reduce microbial population by 90% (one log unit). Z-value is the temperature change needed to reduce the D-value tenfold. Together, they enable food proc

2 منبع1923
pain medicine

Dallas Pain Questionnaire

The Dallas Pain Questionnaire (DPQ) is a 16-item self-report instrument developed by Lawlis and colleagues in 1989 to assess the multidimensional impact of low back pain. The DPQ captures four domains: daily activities impact, work/leisure impairment, anxiety/depression, and pain severity, providing a comprehensive pro

3 منبع1989
social psychology

Dark Triad Scale

The Dark Triad Personality Scale measures three socially aversive personality traits: narcissism (entitlement and exploitativeness), Machiavellianism (manipulativeness and strategic lying), and psychopathy (callousness and thrill-seeking). Developed by Delroy Paulhus and Kevin Williams in 2002, and later operationalize

3 منبع2002
nutritional science

DASES

The Nutrition Self-Efficacy Scale, sometimes called the Diabetes Self-Efficacy Scale (DASES), is an 8-item instrument measuring confidence in performing diet-related behaviors and self-management skills. Developed by Lorig and colleagues at the Stanford Patient Education Center in 2003, it is based on self-efficacy the

2 منبع2003
rehabilitation

DASH Outcome Measure

The Disabilities of the Arm, Shoulder and Hand (DASH) is a 30-item self-report questionnaire designed to measure physical disability and symptoms in patients with upper extremity disorders. Developed by Hudak, Amadio, and Bombardier in 1996, the DASH has become the most widely used patient-reported outcome measure for

2 منبع1996
information systems

Data Federation

Data federation is an approach to integrating data from heterogeneous, autonomous, distributed databases without requiring centralized storage. Formalized by Sheth and Larson in 1990, federated systems provide a unified interface to query multiple independent sources while preserving their autonomy and existing schemas

3 منبع1990
information systems

Data Warehousing

Data warehousing is an approach to designing integrated repositories of historical business data optimized for analysis and reporting. Pioneered by William Inmon and Ralph Kimball in the early 1990s, data warehouses consolidate data from diverse operational sources into a centralized, time-stamped, non-volatile store s

3 منبع1992
information systems

Database Normalization

Database normalization is a systematic process for organizing relational database schemas to eliminate redundancy and enforce data integrity. Introduced by Edgar Codd in 1970-1971 as part of the relational database model, it defines a series of normal forms (1NF through BCNF) that progressively eliminate different type

3 منبع1970
information systems

Database Partitioning

Database partitioning is a technique for dividing large tables across multiple physical storage units or servers to improve performance and scalability. Developed in the context of distributed databases, partitioning allows individual queries to access smaller subsets of data, reducing I/O and enabling horizontal scali

3 منبع1986
social psychology

De Jong Gierveld Loneliness Scale

The De Jong Gierveld Loneliness Scale is one of the most extensively used brief instruments for measuring loneliness in population surveys, clinical research, and gerontological studies. Developed by Jenny De Jong Gierveld and Fons Kamphuis in 1985, the 11-item scale (with a shorter 6-item version available) measures e

2 منبع1985
nutritional science

DEBQ

The Dutch Eating Behavior Questionnaire is a 33-item self-report instrument designed to assess three distinct eating behavior patterns: restrained eating (cognitive control of food intake), emotional eating (eating in response to negative emotions), and external eating (responsiveness to food cues). Developed by van St

2 منبع1986
remote sensing

Deep Remote Sensing

Deep Learning for Remote Sensing Image Segmentation applies convolutional neural networks and encoder-decoder architectures to automatically classify and delineate objects in satellite or aerial imagery at the pixel level. Systematically reviewed by Zhu et al. (2017) in IEEE Geoscience and Remote Sensing Magazine, this

1 منبع2017
reliability

Degradation Models

Degradation models estimate product lifetime by tracking measurable performance characteristics—such as crack length, light output, or insulation resistance—over time rather than waiting for outright failure. Introduced in rigorous form by Meeker, Escobar, and Lu (1998), these models fit a stochastic degradation path t

1 منبع1998
nursing

Delirium Observation Screening Scale

The Delirium Observation Screening Scale (DOS), developed by Mieke J. Schuurmans and colleagues in 2003, is a brief clinician-rated screening instrument designed to detect delirium in hospitalized older adults. Delirium—acute onset confusion, inattention, and disorganized thinking—is a common complication in hospitals

2 منبع2003
information systems

DeLone and McLean IS Success Model

The DeLone and McLean (D&M) Information Systems Success Model, introduced in 1992 and refined in 2003, provides a comprehensive framework for evaluating information system effectiveness across six dimensions: system quality, information quality, service quality, use, user satisfaction, and net benefits. Unlike acceptan

2 منبع1992
survey methodology

Delphi Technique

The Delphi technique is a structured, multi-round data collection method that harvests and refines expert opinion through iterative questionnaires and controlled feedback. Developed at RAND Corporation in the 1950s, it is designed to converge a dispersed expert panel toward a reliable consensus on complex, uncertain, o

2 منبع1950
agronomy

Dendrochronology

Dendrochronology is the science of dating and interpreting wood and climate from tree rings. Each annual ring records the tree's growth response to weather during that year: wide rings indicate favorable conditions (adequate water, warmth, light); narrow rings indicate stress (drought, cold, shade). By crossmatching ri

3 منبع1909
forestry

Dendrochronology Method

Dendrochronology is the science of dating and analyzing tree rings to reconstruct past climatic conditions, chronologies, and tree growth patterns. Pioneered by Andrew Ellicott Douglass in the early twentieth century and formalized by Fritts and colleagues, dendrochronology enables precise dating of historical wood sam

4 منبع1901
dentistry

Dental Erosion Index

The Dental Erosion Index is a systematic clinical assessment tool that quantifies the severity of tooth surface loss caused by non-carious erosive agents (acidic substances, mechanical abrasion, or biological factors). Multiple index systems exist (e.g., Lussi Index, Basic Erosive Wear Examination or BEWE), each scorin

3 منبع1990
clinical psychology

Depression Anxiety Stress Scales

The Depression Anxiety Stress Scales-21 (DASS-21) is a 21-item self-report instrument measuring three correlated but distinct dimensions of psychological distress: depression, anxiety, and stress. Developed by Lovibond and Lovibond in 1995, the DASS-21 is a short form of the original 42-item DASS. It has become widely

2 منبع1995
tourism management

Destination Image Scale

The Destination Image Scale (DIS) measures how potential or actual visitors perceive and emotionally evaluate a tourism destination. Developed by Echtner & Ritchie (1991) and extended by Baloglu & Brinberg (1997), it captures both rational beliefs about destination attributes (attractions, climate, value, safety) and a

4 منبع1991
survey methodology

Deviant Case Sampling

Deviant case sampling is a purposive qualitative sampling strategy in which the researcher intentionally selects cases that are unusual, exceptional, or markedly different from the norm — outliers, extreme successes, or conspicuous failures. The goal is not statistical representation but deep learning from cases that i

2 منبع1990
medical imaging

DEXA

Dual-Energy X-ray Absorptiometry (DEXA or DXA) is a non-invasive imaging technique that quantifies bone mineral density (BMD) by measuring the attenuation of X-rays at two different energies as they pass through bone and soft tissue. First developed by Wahner and colleagues in 1987, DEXA has become the gold standard fo

3 منبع1987
bereavement psychology

DGS

The Disenfranchised Grief Scale (DGS), developed from Kenneth J. Doka's conceptual framework, assesses grief that society does not recognize, validate, or support—grief that is excluded from public mourning rituals, openly acknowledged grief ceremonies, or institutional support. Examples include loss of a former spouse

1 منبع2002
cardiology

Diabetes Distress Scale

The Diabetes Distress Scale (DDS) is a 17-item self-report measure that quantifies emotional and psychosocial distress specifically related to living with and managing diabetes. Developed by Polonsky and colleagues in 2005, the DDS captures diabetes-specific worries (e.g., regimen burden, fear of complications, social

1 منبع2005
cardiology

Diabetes Self-Efficacy Scale

The Diabetes Self-Efficacy Scale (DASES) is an 8-item self-report measure that assesses a patient's confidence in their ability to manage key diabetes self-care tasks: medication adherence, glucose monitoring, diet management, exercise, and coping with symptoms or complications. Developed by Lorig and colleagues based

2 منبع2009
endocrinology

Diabetes Symptom Checklist

The Diabetes Symptom Checklist is a 34-item patient-reported outcome measure assessing the frequency and burden of symptoms directly related to diabetes and its complications. Developed by Grootenhuis and colleagues in 1994, it captures eight symptom dimensions including hyperglycemic symptoms, hypoglycemic symptoms, f

2 منبع1994
clinical research

Diagnostic Accuracy Study Design

A diagnostic accuracy study evaluates how well a new diagnostic test (or biomarker, imaging modality, clinical assessment) detects the presence or absence of disease compared to a reference standard (gold standard). Standardized since 2003 by the STARD (Standards for Reporting of Diagnostic Accuracy Studies) initiative

3 منبع2003
clinical psychology

Dialectical Behavior Therapy

Dialectical Behavior Therapy (DBT) is a comprehensive, multimodal psychosocial intervention developed by Marsha M. Linehan to treat individuals with Borderline Personality Disorder (BPD) and chronic suicidality. Combining cognitive-behavioral principles with dialectical philosophy and Zen principles, DBT is delivered t

2 منبع1993
survey methodology

Diary Method

The diary method is a data-collection technique in which participants record their thoughts, behaviours, events, or experiences in their own words at regular or event-contingent intervals over a defined study period. By capturing data close in time to the event, diaries reduce retrospective recall bias and give researc

2 منبع1920
psychology

Dichotic Listening

The Dichotic Listening Task is an auditory measure of selective attention and hemispheric lateralization. Different speech stimuli (words, digits, or syllables) are presented simultaneously to each ear via headphones. Participants attend to one ear (shadowing or repeating that information) while ignoring the other. Acc

3 منبع1953
psychology

Dictator Game

The Dictator Game is a simple economic decision task measuring generosity and prosocial behavior. One player (dictator) receives money and unilaterally decides how to allocate it between themselves and an anonymous second player (recipient). The recipient cannot reject the offer; they simply receive what the dictator g

3 منبع1994
psychometrics

Differential Item Functioning

Differential item functioning identifies test or survey items that behave differently for examinees from different groups — such as gender, ethnicity, or language background — after controlling for the underlying ability or trait being measured. DIF analysis is essential for fairness evaluation in educational testing a

2 منبع1970
clinical psychology

Difficulties in Emotion Regulation Scale

The DERS is a 36-item self-report measure assessing multidimensional emotion dysregulation across six related but distinct facets. Developed by Gratz and Roemer in 2004, it has become a cornerstone transdiagnostic measure in emotion regulation research, capturing emotional avoidance, behavioral dyscontrol, and limited

1 منبع2004
military psychology

Difficulty in Transition Scale

The Difficulty in Military-to-Civilian Transition Scale measures the severity of adjustment challenges experienced by separating and separated service members. It assesses distress across psychological, social, occupational, and identity domains as individuals transition from military life to civilian society. Used in

2 منبع2011
neuroimaging

Diffusion Kurtosis Imaging

Diffusion Kurtosis Imaging (DKI) is an advanced diffusion MRI technique that quantifies non-Gaussian diffusion of water molecules, providing detailed information about tissue microstructure beyond conventional diffusion tensor imaging. Introduced by Jensen and colleagues in 2005, DKI detects deviations from normal Gaus

2 منبع2005
marketing

Diffusion of Innovation Model

The Diffusion of Innovation (DOI) model is a theoretical framework developed by Everett Rogers in 1962 to explain how innovations spread through populations over time. The framework categorizes adopters into five groups based on when they adopt an innovation and describes the characteristic S-shaped curve that typicall

3 منبع1962
agronomy

Digital Soil Mapping

Digital Soil Mapping (DSM) is a quantitative, data-driven pipeline that predicts the spatial distribution of soil properties and classes across a landscape by statistically linking field observations to environmental covariates — terrain attributes, remote sensing imagery, climate surfaces, and geology layers. The appr

2 منبع1990
strategic management

Digital Transformation Readiness Scale

Digital Transformation Readiness refers to an organization's preparedness to successfully adopt digital technologies, redesign business processes, and develop new digital capabilities to compete in increasingly digital markets. Westerman, Bonnet, and McAfee (2014) identify nine elements of digital transformation spanni

3 منبع2014
social media psychology

Digital Wellbeing Scale

The Digital Wellbeing Scale is a multidimensional self-report instrument that assesses positive and negative aspects of technology use, capturing not just problematic behaviors but also digital resources supporting wellbeing. Developed by Azevedo and colleagues in 2022, this scale recognizes that digital engagement exi

1 منبع2022
psychometrics

DINA Model

The DINA Model (Deterministic Inputs, Noisy Outputs) is a cognitive diagnostic model developed by Junker and Sijtsma (2001) that classifies examinees into latent skill classes based on their item response patterns. DINA assumes a deterministic relationship between skill mastery and correct responses, with probabilistic

3 منبع2001
psychometrics

DINO Model

The DINO Model (Deterministic Inputs, Noisy Outputs—Disjunctive) is a cognitive diagnostic model that relaxes DINA's conjunctive (AND) skill requirement logic. DINO assumes an examinee only needs to master one of multiple possible skill pathways to answer an item correctly, making it suitable for scenarios where skills

3 منبع2006
rehabilitation science

Disability Rating Scale

The Disability Rating Scale (DRS) is a brief, clinician-administered measure specifically designed to assess the severity of disability and functional recovery across the entire spectrum of traumatic brain injury (TBI)—from acute coma to community reintegration. Developed by Rappaport and colleagues in 1982, DRS has be

2 منبع1982
psychometrics

Discriminant Validity

Discriminant validity is evidence that a latent construct is empirically distinct from other constructs it should differ from. Originating in Campbell and Fiske's multitrait-multimethod framework (1959), it is a core component of construct validity and a mandatory check in scale development and structural equation mode

2 منبع1959
rheumatology

Disease Activity Score 28

The DAS28 is a composite measure of rheumatoid arthritis (RA) disease activity, combining joint counts, inflammatory markers, and patient-reported global health. Developed in 1995 by Prevoo and colleagues, it has become the gold standard for monitoring RA activity in clinical trials and practice. It integrates objectiv

1 منبع1995
survey methodology

Disproportional cluster sampling

Disproportional cluster sampling is a probability-based survey design in which naturally occurring groups (clusters) are selected as primary sampling units, but the number of clusters or elements drawn from each group is not proportional to that group's share of the population. By deliberately over- or under-sampling c

2 منبع1950
survey methodology

Disproportional Stratified Sampling

Disproportional stratified sampling divides the population into mutually exclusive strata and deliberately draws different proportions from each stratum — oversampling small or analytically important subgroups and undersampling large ones. Post-hoc weighting restores population-level representativeness when overall est

2 منبع1934
sleep medicine

DISS

The Daytime Insomnia Symptom Scale (DISS) is a focused assessment tool measuring the daytime functional consequences and symptoms resulting from nighttime insomnia. Developed within research on sleep disturbance and daytime functioning, it captures the daytime manifestations of poor sleep: fatigue, concentration diffic

1 منبع2007
psychiatry

Dissociative Experiences Scale

The DES is a 28-item self-report questionnaire designed to measure the frequency and severity of dissociative symptoms, including depersonalization (feeling detached from one's body), derealization (feeling the world is unreal), amnesia, absorption (intense focus), and identity confusion. Developed by Bernstein and Put

3 منبع1986
pharmacology

Dissolution f1/f2 Similarity

The f1 and f2 factors are dimensionless statistical measures developed by Moore and Flanner to quantify the similarity between two dissolution profiles. Adopted by regulatory agencies (FDA, EMA) as the gold standard for comparing dissolution curves, these factors enable rapid assessment of whether formulation changes s

2 منبع1996
ecology

Distance Sampling

Distance sampling is a statistical method for estimating population abundance from data on distances between observers and detected individuals. Developed by Buckland and colleagues (1993) and formalized in the software Distance, this approach accounts for imperfect detection: animals far from an observer are less like

3 منبع1993
dentistry

DMFT Index

The DMFT (Decayed, Missing due to caries, Filled) Index is a standardized epidemiological measure of dental caries experience in permanent dentition. Developed by Klein, Palmer, and Knutson in 1938, it quantifies the number of permanent teeth that are decayed, missing due to caries, or filled due to caries. The DMFT In

3 منبع1938
spectroscopy

DMRG

Density Matrix Renormalization Group (DMRG) is a powerful computational method for solving strongly correlated quantum systems, particularly one-dimensional lattice models and quantum chemistry problems. Introduced by White in 1992, DMRG uses a variational approach and tensor-network representation to efficiently descr

2 منبع1992
survey methodology

Document Collection

Document collection is a systematic data-collection technique in which the researcher gathers and reviews existing written, visual, or digital records — such as reports, meeting minutes, policies, letters, photographs, or institutional records — as primary or supplementary evidence. It is widely used in qualitative, hi

2 منبع2000
sampling

Double Sampling

Double Sampling (also called two-phase or multistage sampling) is a survey design in which a large preliminary sample is collected using inexpensive methods or partial information, then a smaller subsample is drawn from it and measured in detail. Pioneered by Jerzy Neyman in 1938, it is particularly useful when a cheap

3 منبع1938
food science

DPPH Radical Scavenging Assay

The DPPH radical scavenging assay is a rapid, widely used spectrophotometric method for measuring the antioxidant capacity of foods, plant extracts, and purified compounds. It quantifies how effectively a sample neutralises the stable synthetic free radical DPPH (2,2-diphenyl-1-picrylhydrazyl) by measuring the resultin

2 منبع1958
sustainability

DPSIR Framework

The DPSIR Framework (Driving force, Pressure, State, Impact, Response) is a diagnostic and policy tool developed by the OECD (1993) and refined by the European Environment Agency (1999) to structure environmental and sustainability problems. It organizes causal relationships from economic activity through to policy int

3 منبع1993
nutritional science

DQI-I

The Dietary Quality Index-International is a comprehensive dietary quality assessment tool developed to evaluate overall diet quality based on food and nutrient intake data. Introduced by Kim and colleagues in 2003, the DQI-I incorporates four key dimensions of diet quality: adequacy (adequate intake of essential nutri

2 منبع2003
psychology

Drift Diffusion Model

The Drift Diffusion Model (DDM) is a mathematical framework for understanding rapid binary decision-making by modeling the accumulation of evidence over time as a random walk with drift. Developed by Roger Ratcliff in the 1970s, it predicts both choice probabilities and response time distributions, providing insight in

3 منبع1978
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