University of Tehran

Dynamic maintenance model for a load sharing k-out-of-n: G system using deep reinforcement learning

In this paper, a deep reinforcement learning approach is used to provide a dynamic maintenance model for a load sharing <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:mrow> <mml:mi>k</mml:mi> </mml:mrow> </mml:math> -out-of- <mml...

Typology of transit-oriented development to promote sustainable urban structure

<title>Abstract</title> Transit-Oriented Development (TOD) has emerged as a transformative strategy in sustainable urban planning, aiming to integrate land use and public transportation to foster compact, walkable, and mixed-use communities centered around high-capacity transit s...

Branding as Market-Facing Infrastructure: A Research-through-Design Study of Lalejin Pottery

Lalejin, in Iran's Hamedan Province, is a historically significant pottery-producing centre in which substantial craft skill and recognised ceramic heritage coexist with fragmented market presentation, limited maker attribution and weak mechanisms for connecting products to maker...

Exploring the impact of human development, education and R&D expenditures on nation brand competitiveness: evidence from cross-country panel data

Purpose This study investigates the impact of education and research and development (R&amp;D) expenditures on nation brand value (NBV), while also considering the roles of government effectiveness (GE) and human development. This study aims to provide insights into how investmen...

Modulatory effects of branched-chain amino acid supplementation on neuroendocrine disturbances following traumatic brain injury in rats

Traumatic brain injury (TBI) is frequently accompanied by neuroendocrine disturbances involving the hypothalamic–pituitary–thyroid (HPT) axis and vitamin D–calcium–phosphorus homeostasis. Despite increasing interest in nutritional strategies after TBI, the effects of branched-cha...

Enhanced oxidative bioleaching of Cd-bearing ZnS concentrate in moderately thermophilic conditioning, comparing additives effects at high pulp density

The study aimed to enhance the dissolution rates of zinc (Zn) and cadmium (Cd) in sphalerite concentrates through bioleaching using moderately thermophilic bacteria. The research explored the impact of various additives, such as silver ions (Ag + ), L -cysteine, pyrite, elemental...

High-accuracy UAV photogrammetry and GIS integration for 3D cadastral data generation

Abstract This study presents a UAV photogrammetry and GIS-based workflow for generating high-accuracy three-dimensional cadastral models in urban environments. The proposed framework integrates RTK-enabled UAV image acquisition, ground control point (GCP) surveying, photogrammetr...

An integrated graph neural network and structure-based workflow for the discovery of allosteric PCSK9 inhibitors

Proprotein convertase subtilisin/kexin type 9 (PCSK9) plays a central role in cholesterol homeostasis by promoting the degradation of low-density lipoprotein receptors (LDLR), making it an attractive therapeutic target for cardiovascular disease. Although monoclonal antibodies an...

Frontal spectral entropy as a candidate individual-difference correlate of within-session accuracy change in youth soccer: an exploratory fixed-order study

Choking under evaluative pressure is often described in sport, yet its within-session neural and behavioural correlates in youth athletes remain poorly characterised. In this exploratory, fixed-order study we asked whether changes in soccer decision accuracy over the course of a...

A decision-making architecture for sustainability: Optimization of human resource management with triple bottom line in the extractive sector using a multi-objective approach

Purpose This research develops a mathematical decision-making model to optimise sustainable human resource management (HRM) performance based on the Triple Bottom Line (TBL), using the Iranian oil industry as an empirical case within resource-intensive sectors. Design/methodology...

A combined workflow using geology, petrophysics, and geomechanics to locate productive zones and ideal fracture networks

A complete reservoir evaluation requires studying both petrophysical and mechanical rock properties. Accordingly, Well logs are widely used in the oil industry to determine key parameters and locate high-production zones. This study presents an integrated workflow using Formation...

Tissue-specific transcriptome analysis uncovers phenylpropanoid biosynthetic genes in Althaea officinalis

Althaea officinalis is a medicinal plant, rich in mucilage and polyphenols and traditionally used to relieve inflammation and irritation of respiratory, digestive, and urinary tissues. This study presents the first comprehensive transcriptomic analysis of A. officinalis revealing...

Integrated light spectrum and growth regulators improved the growth of saffron daughter corms by regulating carbohydrate metabolism in a novel two-stage cropping system

Saffron, a valuable spice and industrial crop used in food, pharma, and cosmetics, is propagated only vegetatively via corms due to triploid male sterility. Corms are the primary storage organs and determine both the yield and quality of daughter corms. However, the optimal growi...

Graded Levels of Dietary Valine in Protein‐Restricted Diets: Effects on Reproductive Performance and Tissue Morphology in Laying Japanese Quail

BACKGROUND: Valine (Val) is an essential branched-chain amino acid that plays a critical role in protein synthesis and reproductive function in poultry. However, the optimal dietary Val requirement for laying Japanese quail fed reduced-protein diets remains insufficiently defined...

Agricultural interventions in developing-region smallholder systems: A harmonized outcome–metric meta-analysis of productivity, livelihood, and welfare outcomes

Agricultural interventions are central to smallholder productivity, livelihoods, and food-security policy in developing regions, but their evidence base is fragmented across outcomes, effect metrics, designs, and contexts. This study provides a quality-controlled, harmonized outc...

Hydrodynamic, sediment transport and water residence time changes in response to structural changes (Anzali Port–Wetland System)

Breakwaters are essential coastal structures for protecting ports, yet their modification can substantially alter hydrodynamics, sediment transport, and water renewal processes, especially in sensitive port–wetland systems. This study investigates the impacts of the new breakwate...

Predictors of academic self-efficacy in medical intern students: the roles of mindful eating, physical activity, sleep quality, and mental workload

Academic self-efficacy, defined as an individual’s belief in their capacity to complete academic tasks, may play a role in the learning and performance of medical students. Lifestyle factors such as sleep quality, physical activity, and mindfulness-based behaviors have been assoc...

Transcriptome analysis of damask rose (Rosa damascena Mill.) petals: unveiling the genetic basis of essential oil biosynthesis

Identifying the key genes and transcription factors involved in essential oil production in Rosa damascena is an important step toward understanding the molecular mechanisms underlying essential oil biosynthesis. Such knowledge may be applied in breeding programs aimed at improvi...

Parametric hydrodynamic and acoustic performance analysis of toroidal propellers with emphasis on geometric variations and advanced design optimization

Toroidal propellers, defined by their continuous closed-loop blade topology, offer promising potential for marine propulsion but remain insufficiently characterized through systematic geometric parametrization. This paper presents a numerical and experimental study of toroidal pr...

Evaluation of the effects of sesame-based emulgels with natural and synthetic antioxidants on the physicochemical quality attributes of fried chicken nuggets

Deep-fat frying of chicken nuggets generates harmful lipid oxidation products and excessive oil uptake, compromising nutritional quality. This study investigated sesame-based emulgels (1% or 7% w/w), with or without antioxidants (0.2% rosemary extract and 0.02% tert-butylhydroqui...