Dense Texture Research Articles

Safety Analysis of Freshwater Fish

The results presented in this paper demonstrate that the microbial population in the hydroecosystem has seasonal variations. The bacterial contamination of water and fish in November was 140 and 11 times less than in July respectively. It was found that fish caught in natural reservoirs in the autumn-winter period had different dynamics in the development of postmortem changes in comparison with those caught in the summer period. Postmortem secretion of mucus was not as pronounced in autumn-winter as in summer. Postmortem rigidity on the contrary was pronounced; gill covers were tightly fitting; and spinal muscles were tensed and of dense texture. Storing fresh river fish at a temperature of 3-5°C for 24 hours did not lead to a change in sensory evaluation. Physic-chemical indicators corresponded to the values characterizing fresh, healthy fish. During storage, the bacterial contamination of fish increased by more than 100 times, while the maximum permissible number of microorganisms (5.0 × 104 CFU / g) was not exceeded.
 Keywords: fish, microbiological control, organoleptic and physic-chemical indicators

Pengaruh Penambahan Tepung Rumput Laut (Eucheuma sp.) Terhadap Mutu dan Karakteristik Amplang Ikan Tongkol (Euthynnus affinis)

Seaweed flour is a potential source of dietary fiber expected to improve the quality of fishery products. The purpose of this study was to determine the effect of addition of seaweed flour (Eucheuma sp.) on the quality and characteristics of tuna fish amplang. The research method was using a non-factorial completely randomized design (CRD) consisting of five treatments of varied amount of seaweed flour added (0, 0.5%, 1%, 1.5%, and 2% from the total dough weight). The variables to assess the quality were the organoleptic quality and characteristics (appearance, aroma, taste and texture), swelling degree, and proximate content. The results showed that the addition of seaweed flour can improve the proximate composition of fish amplang, especially the increase in crude fiber content. The addition of seaweed flour has an optimum concentration point of 1% to produce the best tuna fish amplang with the characteristic of bright colors, clean, smooth surface, not cracked, savory taste and a crunchy and dense texture. The score of the appearance was 8.3; aroma was 7.7, taste 8.2, texture 8.5, and the swelling degree was 384%. The best product was containing water 1.14%, ash 3.82%, protein 39.59%, fat 12.92%, and fiber 5.79%. The product quality assessed was met the quality requirements as regulated by Indonesia National Standard for fish amplang (SNI 7762:2013).

One-step fabrication of hydrophobic yttria stabilized zirconia - Polytetrafluoroethylene – Silicone composite coating with considerable anti-wear and anti-corrosion properties

A novel yttria stabilized zirconia (YSZ) - polytetrafluoroethylene (PTFE) - silicone composite coating was fabricated by the atmospheric plasma spraying (APS). Results showed that this coating exhibited dense texture and surface uplift feature due to the thermal-mechanical shock synergistic effect, and showed good hydrophobicity with a contact angle of 150.65°. The sliding wear test confirmed that the coating showed excellent self-lubricating property, reflected by a low friction coefficient of 0.12. This coating also showed good marine weatherability, and possessed excellent corrosion resistance with a high potential which a value is closed to 0 V. These current results clearly demonstrated that APS technique possessed a huge advantage for the one-step fabrication of the ceramic doped PTFE-based composite coating with considerable wear resistance and corrosion resistance.

Results of semi-finished horse meat products research using protein fortifiers after heat treatment

Meat products play a key role in human nutrition. It is necessary to introduce and apply new, extraordinary approaches to solving a number of problems in order to intensify technological processes and create environmentally safe, harmless and optimal technologies for processing raw materials. In the production of meat products, the main requirement for raw materials is its balance in all ingredients, proteins, fats, carbohydrates, minerals, as well as the balance of proteins in amino acid composition. Horse meat fully meets this requirement. One of the most dynamically developing branches of the meat industry is the production of semi-finished meat products. The purpose of the research is to study semi-finished horse meat products using protein fortifiers after heat treatment. As a result of heat treatment, meat products acquire new characteristic taste, aromatic qualities, a dense texture and are better absorbed. In the steamed test products, the moisture content increased by 1.01%, the fat decreased by 0.87%, and the protein increased by 1.01%. In fried semi-finished products, the loss of vitamins was: thiamine (B1) - 30%, riboflavin (B2) - 10%, niacin (PP) - 15%, tocopherol (E) - 17.5%, A and C - 19.97 and 70 % respectively. In steamed semi-finished products, the loss of vitamins in niacin (B1) - 10%, riboflavin (B2) - 10%, niacin (PP) - 10%, tocopherol (E) - 12.2%, A and C - 15, 02 and 60% - respectively. The study of the mineral composition of fried and steamed semi-finished products showed that the loss of mineral substances was: potassium - 23.3 and 19.8%; sodium - 15 and 10.24%; calcium - 10 and 5.04%; magnesium - 21.9 and 12.75%; phosphorus - 20.1 and 10.7%; iron - 4.98 and 3%; zinc - 5.04 and 2.9%, respectively. In general, 0.81 is consumed from the amount of NAC products exposed to frying; steam treatment: 0.88.

3D printed scaffolds of alginate/polyvinylalcohol with silk fibroin based on mimicked extracellular matrix for bone tissue engineering in maxillofacial surgery

This research investigated 3D printed scaffolds of alginate/polyvinylalcohol incorporated with silk fibroin (SF) fabricated by mimicking soft materials similar to bone extracellular matrix. The alginate/polyvinyl alcohol incorporated with 0 %, 0.5 %, 1 %, and 2 % SF were fabricated into 3D printed scaffolds. The morphology was observed using scanning electron microscopy and the structures were characterized by differential scanning calorimetry. The swelling behavior and degradation of the scaffolds were tested. The scaffolds were cultured with osteoblast cells before evaluation of cell adhesion, viability, and proliferation along with protein synthesis of the osteoblast cells, alkaline phosphatase activity, and calcium deposition on the scaffolds. The structural formation showed SF attached to the PVA and embedded in the alginate without attachment. The surface morphology of the scaffolds with SF showed oriented filaments and the cross-sections exhibited a dense texture with porous structures. The scaffolds with SF had a lower swelling behavior and greater degradability than the scaffolds without SF. The biological functions of the scaffolds with SF showed good cell adhesion, viability, and proliferation and good alkaline phosphatase activity, protein synthesis, and calcium deposition. The results demonstrated that the scaffolds with 2 % SF are promising for maxillofacial surgery.

The Surfaces of the Ceratonia siliqua L. (Carob) Leaflet: Insights from Physics and Chemistry.

The production of superhydrophobic coatings inspired by the surface of plant leaves is a challenging goal. Such coatings hold a bright technological future in niche markets of the aeronautical, space, naval, building, automobile, and biomedical sectors. This work is focused on the adaxial (top) and abaxial (bottom) surfaces of the leaflet of the Ceratonia silique L. (carob), a high-commercial-value Mediterranean tree cultivated in many regions of the world. The adaxial and abaxial surfaces feature hydrophobic and superhydrophobic behaviors, respectively. Their chemical composition is very simple: monopalmitin ester and palmitic acid are protuberant in the epicuticular and intracuticular wax layers of the adaxial surface, respectively, whereas 1-octacosanol dominates in the abaxial wax layers. In both surfaces, epicuticular wax is organized along a randomly oriented and intricate network of nanometer-thick and micrometer-long plates, whose density and degree of interconnection are significantly higher in the abaxial surface. The measured tilting angles for the abaxial surface (12-70°) reveal unusual variable density and water adhesion of the nanostructured plate-based texture. Optical measurements demonstrate that light reflectance/absorbance of the glaucous abaxial surface is significantly higher/lower than that of the nonglaucous adaxial surface. In both surfaces, diffuse reflectance is dominant, and the absorbance is weakly dependent on the light incidence angle. We show that the highly dense nanostructured platelike texture of the epicuticular abaxial layer of the C. siliqua leaflet works as a sophisticated light and water management system: it reflects solar radiation diffusely to lower the surface temperature, and it has superhydrophobic character to keep the surface dry. Such attributes enable efficient gas exchange (photosynthesis and respiration), transpiration, and evaporation. To mimic for the first time the abaxial surface, a templation approach was adopted using poly(dimethylsiloxane) (PDMS)/poly(methylphenylsiloxane) (PMPS) positive/negative replicas and a soft polymer/siloxane negative replica produced by the sol-gel process. Because high topographical variations of the biotemplate and wax adhesion to the biohybrid film affected the replication quality, the reproduction of the wax texture via the synthesis of 1-octacosanol-grafted siloxane-based hybrid materials is proposed as a suitable route to duplicate the abaxial surface with high fidelity. The natural chemical/physical strategy adopted by the C. siliqua leaflet to face the harsh Mediterranean climate is a powerful source of bioinspiration for the development of diffuse reflecting and superhydrophobic material systems with foreseen applications as dual-functional antiglare and water-repelling coatings.

Functional and technological properties of fish farce with added amaranth and chickpea flour

The purpose of this work is to research the functional and technological properties of Alaska Pollock farce systems with added amaranth and chickpea flour, which improve their structure. As a principal object of our research, we used frozen Alaska Pollock (Theraqra chalcoqramma), as well as amaranth and chickpea flour as structure forming additives. The article explores the influence of amaranth and chickpea-seed flour added in the proportion of 10.0% to the total raw mass input on the functional and technological properties of Alaska Pollock farce. We discovered that adding amaranth and chickpea flour is reasonable for increasing viscosity, water-binding and water-retaining capacity of farce systems. As a result, we found out that the farce compositions we developed are characterized by improved structural, mechanical, and rheological properties and sensory parameters as compared with the Alaska Pollock’s ground muscular tissue. Combined farce systems have a dense and elastic texture, good structure and high capacity to bind and retain water. The article substantiates the use of structure-forming additives from domestically produced raw to manufacture fish farce. The research conducted makes it possible to consider Alaska Pollock farce with amaranth or chickpea flour added in the proportion of 10.0% to the total raw mass input as a raw material to manufacture shaped products with improved functional and technological properties.

Areca Catechu: An Eco-Friendly Corrosion Inhibitor for Reinforced Concrete Structures in Corrosive Mediums

The main reason causing the degeneration of steel reinforced concrete supposed to be corrosion of reinforcement steel. In this study, compressive strength, weight loss and field emission scanning electron microscopy (FESEM) were performed in order to investigate about the changes due to addition of 2% bio-friendly and chemical inhibitors per cement weight on corrosion of reinforced concrete mixed with 5% of NaCl and MgSO4 as corrosive materials. The results showed that Areca Catechu added sample revealed a dense texture clustered formation of gypsum. The samples with corrosion inhibitors had relatively more homogeneous surfaces and exhibited a smoother structure.

Bács-Kiskun megye térszerkezete és a telekárak (Területi különbségek a társadalom értékítéletében)

Expanding the investigations related to land price analysis, this study demonstrates the territorial aspects of the issue through the example of Bács-Kiskun county enriching the methodology of spatial structure researches. The applied correlation analysis confirmed our assumption that scarcely more than a decade after the change of ownership relations, great differences can be detected among land prices, which reflect the main features of the county’s spatial structure. The land price map of Bács-Kiskun County demonstrates the main features of the spatial structrure and the characteristics of the centre-periphery relationships at municipal level. High land prices are typical in the areas which are rich in innovations and can be characterized with denser texture. Getting farther from them, the land prices become lower. Their temporal changes are also consistent with the interactions taking place in the spatial structure.

Imitating Christ and the Saints: Katrin Gebbe’s Tore tanzt/Nothing Bad Can Happen (DE 2013) as Hagiographic Narration

Erwin Panofsky already pointed to the fact that the then fairly new medium of film relied on the Western iconographic tradition and created iconographic conventions of its own. Therefore, it is not surprising that film makers exploited the visual and narrative treasures of the Christian hagiographic tradition on the movie screen throughout the medium’s history. They did not only re-tell the life of Christ and the saints, but also created new plots following and re-interpreting the established conventions of hagiographic genres. Furthermore, the citation and adaptation of Christian iconographies is even used to render protagonists more complex and to regulate the viewer’s emotional response. The present article analyses Katrin Gebbe’s film Tore tanzt/Nothing Bad Can Happen (DE 2013) as an example of how biblical and hagiographic traditions are used in contemporary cinema to critically discuss religious mind-sets and the social dynamics of violent family structures. The director does not simply model the protagonist of her film as a modern day Christ who sacrifices himself for others, but clearly characterises Tore through references to other saints and biblical figures among whom Saint Francis, the alter Christus of the 13th century, is of major importance. Around this core idea, Gebbe creates a dense visual texture of hagiographic signs and allusions contradicting and enforcing one another so that the viewer’s uncertainty grows as to how to judge the events on screen.

A Novel Coal Dust Characteristic Extraction to Enable Particle Size Analysis

Coal particle characteristic extraction is essential to prevent dust explosions. It is traditionally analyzed by manual screening, which is relatively time-consuming and cannot automatically capture outlining. To address this issue, an accurate and automatic particle image segmentation method is highly demanded in the smart mine. Thus, a novel characteristic learning approach that applied simplified VGGNet as a backbone network is investigated to learn the feature details of particle image sample. The sample set includes 3000 dust images captured from coal preparation plants. First, hierarchical features are extracted step by step on the improved VGGNet. Meanwhile, the feature maps obtained via convolution are sent to the dual attention mechanism module to determine the global feature weights, and the particle characteristic information is optimized. Afterward, an erosion-dilation module is applied to achieve dense texture separation in the deep feature map. Finally, the particles are segmented by upsampling on unpooling. The experimental results show that the proposed method achieves better precision, recall, and ${F}1$ with 0.8743, 0.8351, and 0.8543, respectively, than other previous methods. Compared with laser diffractometry, the maximum error $\varepsilon $ is 5.115% in the range of $R \le 75~\mu \text{m}$ , and this is consistent with the expected. The proposed method outperformed other state of the arts on segmentation results and can be applied in coal dust detection for enterprise as a viable alternative.

RETRACTED: Research on multiple classified signal detection algorithms based on mimo-ofdm system

OFDM is a high-speed signal transmission technology in wireless environment. In wireless channels, the frequency response curve is generally non-flat. MIMO technology can effectively increase system capacity, improve system performance, and improve network coverage and transmission reliability. OFDM technology can effectively resist intersymbol crosstalk caused by multipath propagation by adding a certain length of redundant guard interval in front of transmission symbols. According to the channel estimation and signal detection algorithms in MIMOOFDM systems, this paper will choose a better algorithm to implement MIMOOFDM systems and channel estimation and signal detection algorithms. Theoretical analysis and simulation results show that the optimal detection algorithm has the best performance, but its complexity is exponentially related to the number of antennas and modulation order. The architecture for dense texture analysis is developed based on Field Programmable Gate Array FPGA device which is a general engine for high-speed image processing. In order to maximize the performance, our architecture is designed for minimizing consumed resources. As explained in subsection our architecture is composed of two main operations, namely the AH based sum and difference of images and the calculus of texture features

Malatya Geleneksel Konutları Ve Dokusu Üzerine Bir Yaklaşım: Yakınca Evleri

Anadolu ve Malatya tarihi ticaret yolları, jeopolitik ve topografya özellikleri nedeniyle tarih boyunca birçok uygarlık tarafından yerleşim alanı olarak tercih edilmiştir. Bu bağlamda Malatya kültürel ve doğal miras bakımından çok zengin ve çeşitli mimari mirasa ve dokuya sahiptir. Kültürel mirasımızın önemli bir bölümünü oluşturan geleneksel konutlar, yapıldığı bölgelerdeki sosyo-kültürel ve çevresel etmenlerden etkilenerek ve şekillenerek günümüze kadar gelmiştir. Geleneksel Türk evi; Anadolu’nun çevresel ve kültürel ortamı, Türklerin Orta Asya’dan getirdikleri kültürel ve mimari miras ve İslam inancının etkileşiminden ortaya çıkmıştır. Bu nedenle geleneksel konutlar yapıldığı bölgenin iklim, topoğrafya, kültürel ortam gibi fiziksel ve kültürel normların özellikleri ve çeşitliliğine göre şekillenerek; bölgeye özgü malzeme, mekan kurgusu, konumlanma ve yapım tekniği gibi mimari karakterler olarak karşımıza çıkmaktadır. Geleneksel konutlar dönemin sosyal, kültürel, ekonomik, teknoloji ve yapım teknikleri gibi birçok alanda bizlere veriler sunan önemli kültürel değerlerdir. Malatya, geleneksel konut ve doku bakımından zengin bir kültürel mirasa sahiptir. Fakat günümüzün değişen sosyo-kültürel ortam, ihtiyaçlar, yaşam tarzı, rant, hızlı kentleşme gibi birçok nedenden dolayı; Malatya, özellikle geleneksel dokusunu hızla kaybetmektedir. Bu bağlamda geleneksel konutları ve dokusunun büyük bir bölümünü halen özgün bir şekilde korumuş olan Yeşilyurt ilçesinin Yakınca Mahallesinde ki geleneksel konutlar üzerinde çalışma yapılmıştır. Çalışmanın yöntemi olarak literatür taraması yapılmış, çalışma alanı olarak belirlenen bölgedeki geleneksel konutların mekânsal rölöveleri alınmıştır. Geleneksel konutların iç mekan, cephe; taka, niş, dolap, ocak, sedir gibi mimari öğelerin detaylı görselleri çekilmiştir. Çalışmanın amacı; yoğun bir geleneksel dokuya sahip konutlarının plan, mekan özellikleri, cephe özellikleri, malzeme ve yapım teknikleri gibi mimari özelliklerini inceleyerek; yapılar hakkında detaylı irdelemeler yapılması amaçlanmıştır. Bu kapsamda Malatya Yakınca bölgesi özelinde geleneksel konutların önemine vurgu yapılarak, gelecek nesiller için bir literatür altlığı oluşturması ve geleneksel konutların daha iyi korunarak farkındalığın artırılması düşünülmüştür.

Highly transparent, hot water and scratch resistant, lubricant-infused slippery surfaces developed from a mechanically-weak superhydrophobic coating

Superhydrophobic surfaces are usually easy to damage due to their micro/nanoporous structures. As a solution, such a porous surface can be filled with lubricant forming an alternative water-repellent surface, namely, lubricant-infused slippery surface (LISS), which is supposed to be mechanically stronger owing to its dense texture. However, to what degree the mechanical reinforcement could achieve remains an issue without deep understanding. In this study, an extremely weak nanostructured superhydrophobic SiO2 coating is demonstrated capable of being converted into a robust, durable, and antireflective slippery surface with a simple lubrication process. Silicone oils of different viscosities are infused into the SiO2 coatings and the 20 and 50 cSt oils are found to generate superior droplet-shedding properties. These slippery coatings exhibit robust repellency against water jet impacts and hot-water splashes, withstand cotton and sandpaper abrasions, retain their slippery property when subjected to consecutive scratches, long-term immersion, high-speed spinning, water shear friction, and different pH liquids. These performances reflect the powerful role played by the infused oil in enhancing the cohesion of coating and the interactions between coating and substrate, and illustrate the available degree to which the mechanical reinforcement could achieve. This study provides a deep insight into the interactions between a porous coating and infused lubricant, and also a facile method for producing robust LISSs.

Morphology and transport properties of membranes obtained by coagulation of cellulose solutions in isobutanol

The evolution of structural-morphological transformations of cellulose membranes obtained from solutions in N-methylmorpholine-N-oxide through various temperature isobutanol coagulation baths and subsequent treatment with water and their transport properties were studied. Using SEM, it was found that during coagulation in water and drying of the membranes, a uniform monolithic microheterogeneous texture was formed. The replacement of an aqueous precipitation bath with an isobutanol one leads to the formation of a porous structure with wide pore size and shape distributions. With an increase in precipitant temperature in the as-formed membrane, transverse tunnel cavities are formed with respect to the membrane-forming axis, which collapses when the membrane is washed with water, forming a dense texture with a non-uniform membrane volume. The mechanical properties of the obtained membranes were determined and a mechanism is proposed that allows their values to be correlated with structural-morphological and transport properties.

Research on the fabrication and anti-reflection performance of diamond-like carbon films

In this work, a radio-frequency plasma-enhanced chemical vapor deposition (RF-PECVD) system has been employed to fabricate diamond-like carbon (DLC) films for the application in crystalline silicon solar cells. The morphological, structural and optical properties of the synthesised DLC films were investigated under different deposition times, different plasma discharge powers, different CH4 flow rates, and different substrate temperatures, respectively. It is shown that, when the plasma discharge power was 100 W, the CH4 flow rate was 60 sccm, and the substrate temperature was 100 °C, the synthesised DLC film features a high transmittance of 95%, a low surface reflectivity of approximately 14%, a wide optical band gap of 2.6 eV, as well as a uniform and dense texture. Subsequently, the DLC films with different thicknesses were grown on the surface of crystalline silicon solar cells as anti-reflection coatings. The solar cell current-voltage characteristic testing system was used to investigate the change of solar cell performance parameters, i.e., Jsc, Voc, FF and η. After the growth of a DLC film with a deposition time of 20 min on the surface of a crystalline silicon solar cell, the photovoltaic conversion efficiency of the solar cell increases from 4.12% to 5.2%. This work demonstrates that the DLC film has a promising application potential as an anti-reflection layer in crystalline silicon solar cells.

Physicochemical and textural characteristics and volatile compounds of semihard goat cheese as affected by starter cultures

Today, cheese is valued because of its high nutritional value and unique characteristics. Improving the texture and flavor of cheese by selecting suitable starter cultures is an important way to promote the development of cheese industry. The effect of starter cultures on the physicochemical and textural properties and volatile compounds during the ripening of semihard goat cheese were investigated in this work. Different starter cultures-mesophilic (M) and thermophilic starters (T), Lactobacillus plantarum ssp. plantarum ATCC 14917 (Lp), a mix of the M and T starters (M1), and mix of the M, T, and Lp starters (M2)-were used in the production of the goat cheeses. Volatile compounds were determined by a solid-phase microextraction/gas chromatography-mass spectrometric (SPME/GC-MS) method. The results showed that the moisture content of cheeses produced with the 5 kinds of starter cultures decreased after maturation, whereas ash content increased. The pH values of goat cheeses decreased first and then increased during maturity, and the pH value of M2 cheese was the lowest among the cheeses. The hardness and chewiness of the cheeses increased with increasing maturity, whereas cohesiveness, springiness, and resilience showed the opposite tendency. The 60-d-old cheese made with Lp had the highest chewiness, cohesiveness, springiness, and resilience, whereas the 60-d-old cheese made with M2 had the highest hardness. A total of 53 volatile components were identified by SPME/GC-MS, and carboxylic acids, alcohols, ketones, and esters were the 4 major contributors to the characteristic flavors of the cheeses. Volatile components and their contents differed greatly among the produced cheeses. The M2 cheese contained the highest relative content of the main volatile compounds (90.10%), especially butanoic acid and acetoin. Through a comprehensive comparison of the results, we concluded that M2 cheese had a dense texture and milky flavor, and M2 is a potential starter culture candidate for the production of goat cheese.

Improving thawed quality of hot‐pot vegetable balls by a freeze–thaw stability control by adding hydrocolloids

AbstractThe aim of this study was to investigate the effects of addition of three different hydrocolloids (guar gum [GG], arabic gum [AG], and carrageenan gum) with the addition amounts of 0.25–1.00% on frozen vegetable balls quality. The qualities of vegetable balls after 0–5 freeze–thaw cycles (FTC) were evaluated in terms of the dehydration rate, thermal property, textural properties, gel strength, and water mobility and distribution. The results showed that the melting property of ice and cross‐linked structure of frozen vegetable balls can be ameliorated and the drip loss or dehydration can be slowed down by the addition hydrocolloids, thus improving the freeze–thaw stability. With an increasing number of FTC, loose structure was formed which resulted in to the poor quality of boiled product. The best cooking quality in terms of textural properties (springiness, hardness, and gel strength values), dehydration, and melting enthalpy change after 5 FTC was in the order of balls added with 0.50% GG, 0.75% AG, and 0.50% carrageenan. In conclusion, the overall results showed that the addition of hydrocolloids can improve the freeze–thaw stability and cooking characteristics of vegetable balls.Practical applicationsAppropriate addition of hydrocolloids could reduce the negative influence of freeze–thaw cycles on vegetable balls quality by improving physical stability, increasing the content of bound water, and maintaining the dense texture of the product. By an in‐depth study of hydrocolloids in food preparation technology, different types hydrocolloids can be used for the improvement of freeze–thaw stability vegetable products, which has potential for a wide application and development prospects.

Jeff Morris: Hearing Voices

Jeff Morris: Hearing Voices

Spatial Analysis of Geographic Distribution and Accessibility of Suspected Acute Stroke Patients Transferred to Acute Stroke Centers by Emergency Medical Services in Tehran, Iran: A Cross-Sectional Study

Objectives: We intended to map the geographical distribution of patients with acute stroke who called the Tehran EMS center based on the geographic information of the incident location on a map. The distributions of these centers and patients’ access within a standard period were evaluated. Methods: A cross-sectional study based on the registered data was conducted on suspected acute stroke patients > 18 years of age that were transferred by EMS. The analysis was performed based on pointing the patients’ locations and locating the hospitals in ArcGIS software plus a review of the polygons and focal points. Results: Totally, 1,606 patients suspected to stroke with a mean age of 64.89 ± 17.48 years were evaluated, of whom 947 (58.6%) were male. The mean time of arrival of an ambulance in the patient’s location from the EMS station was 11.94 ± 6.67 minutes, and the longest time was 69.32 minutes. The mean time from the patient’s location to the stroke center was 17.79 ± 11.42 minutes (range 2.4 - 83.70 minutes). Stroke centers in Tehran are not distributed in a balanced manner, and they are concentrated on the central and northern parts of Tehran, limiting access to hospital services. Conclusions: The multiplicity of hospitals in the west and center of Tehran led to an increase in access times in eastern Tehran. It emphasizes the necessity of revision of service locating, especially because the east of Tehran has a denser texture than the west.