Types Of Damage Research Articles

Assessment of the impact of the Syrian conflict on archaeological sites in the Daraa region

To date, the attention of both local and global cultural heritage preservation initiatives in Daraa Province, southern Syria, have focused on the well-known Bosra World Heritage site. A comprehensive investigation of damage to Daraa’s many other archaeological sites, poorly studied in comparison to other parts of Syria, has until now, not been undertaken. This study, for the first time, attempts to remedy this, by detailing 1632 instances of damage across 196 archaeological sites surveyed using freely available high-resolution satellite images captured between 2004 and 2022. A key element of this dataset is that it indicates that while the types of damage to heritage sites identified are similar to those that have been documented elsewhere in Syria, the temporal and spatial patterning of this damage can be related to specific local conditions and events. This underscores the need for large-scale studies undertaken using remote sensing, to be grounded within an understanding of local circumstances, to maximize their information value.

Characterization of the Physicochemical Properties of Salix psammophila Sand Barriers Degradation Under Ultraviolet Irradiation and Synergistic Water Environment

The degradation of Salix psammophila mechanical sand barriers in desert environments can lead to a reduction in their windbreak and sand-fixing benefits, thereby becoming a significant factor limiting the operational lifespan of these structures. Targeting the typical damage types of S. psammophila sand barriers in the desert, we conducted simulations of desert sunlight and rainfall phenomena and investigated the changing characteristics of the physical, mechanical, and chemical properties of sand barriers in the degradation process. The results clearly indicate that (1) accelerated aging for 288 h represents a critical time point for assessing changes in physical, mechanical, and chemical properties during the interaction between ultraviolet irradiation and water. Following 576 h of accelerated aging, compared with a fresh S. psammophila branch sample (CK), the mass loss percentage was 24.33%, while the basic density decreased by 35.87%, and the modulus of rupture and elasticity decreases by 24.93% and 23.03%, respectively. (2) After accelerated aging for 576 h, the contents of lignin, hemicellulose, and cellulose decreased by 35.93%, 33.84%, and 22.38%, respectively. The interaction between simulated ultraviolet irradiation and water under sunlight intensifies the vigorous physical and chemical reactions occurring within the S. psammophila sand barrier, alters its internal structure, diminishes its mechanical properties, and expedites the degradation of its protective capabilities.

A Pathological Diagnostic Method for Traditional Brick-Masonry Dwellings: A Case Study in Guangfu Ancient City

Many regions of the world have traditional dwellings, which not only represent the main form of residential architecture, but also carry the local vernacular culture, display the region’s unique architectural style, materials and technology, and have important historical and cultural value. Due to environmental factors, traditional dwellings often suffer from architectural damage that threatens the stability of their structure and affects their esthetics value, resulting in a significant number of abandoned and demolished houses. In order to scientifically and effectively solve the damage problems of traditional dwellings, based on the theory of architectural pathology, the following diagnostic method for damage manifestation and the characteristics of traditional houses is proposed: “Architectural Pathology Appraisal–Pathological Environment Analysis–Mechanical Properties Testings”. The traditional dwellings in the ancient city of Guangfu were used as a case study for the practical application of the methodology for analyzing the main types and causes of the damage of the dwellings by examining the damage information of the dwellings, collecting the environmental data of the damaged walls, and testing the mechanical properties of the damaged walls. The results show that the main damage type in the ancient city dwellings of Guangfu is dampness damage, with corrosion deterioration, wall alkali flooding, and the moisture infiltration phenomenon as the manifested symptoms, and the damage is mainly concentrated in the lower part of the wall. In addition, the humidity and moisture content in the lower part of the wall is higher than that in the upper part of the wall, and the compressive strength of the damaged part of the wall is lower than that of the undamaged part. The humid environment of the old town contributed significantly to the destruction of the dwellings, and water intrusion led to a reduction in the strength of the dwellings’ bricks. Through the diagnostic method of building pathology, the causes of Guangfu dwellings’ damage are identified, and scientific and targeted damage intervention suggestions are made. This is expected to provide guidance for the treatment and prevention of building pathology in the ancient city of Guangfu and serve as a reference for the diagnosis and treatment of pathology in traditional dwellings in other areas.

Beneficial Effects of Epigallocatechin Gallate in Preventing Skin Photoaging: A Review

Skin photoaging, primarily caused by ultraviolet (UV) radiation, leads to skin metabolic disorders, which have adverse psychological and physiological effects on individuals. However, traditional medications for repairing skin photoaging cause side effects. Natural bioactive compounds have been shown to prevent and treat skin photoaging with fewer side effects. Epigallocatechin gallate (EGCG), the main substance in tea polyphenols, is a natural bioactive compound with a range of properties. This review summarizes the beneficial effects and mechanisms of EGCG, as well as the application forms of EGCG in repairing photoaged skin. Results indicated that EGCG has repair effects, including improving elasticity, enhancing moisturization, inhibiting damage, and reducing pigmentation of photoaged skin. It has also been demonstrated that EGCG delivery systems, modified EGCG, and combinations with other bioactive substances could be used for repairing photoaged skin due to its poor stability and low bioavailability. EGCG effectively repairs various types of skin damage caused by UV radiation while maintaining normal skin structure and function. It is, therefore, an effective candidate for repairing photoaged skin. These results could provide references for the development and application of EGCG products for the treatment of photoaged skin.

Garden Snail Predatory Insects’ Modus Operandi Under Laboratory Conditions

Heliciculture farms are susceptible to significant biotic issues that can impact snail breeding, among them, the entomofauna predation of snails. Predatory insects can cause damage to snail shells during predation, and sometimes, the specific type of damage may be characteristic of certain insect families or species. Under laboratory conditions, we analysed the predatory activity of the species Silpha tristis Illiger, 1798 (Coleoptera: Silphidae), Ocypus olens (Müller, 1764) (Coleoptera: Staphylinidae), Carabus (Macrothorax) morbillosus constantinus Kraatz, 1899 (Coleoptera: Carabidae), and Lampyris sardiniae Geisthardt, 1987 (Coleoptera: Lampyridae) against the gastropod Cornu aspersum (Müller, 1774) reared on snail farms located in the Sardinian region. The adult and larval stages of each species were tested, except for L. sardiniae, as only the larval stage preys upon snails. This study showed that among all of the species considered, only two insects were able to damage the shell of C. aspersum: C. morbillosus constantinus and O.olens. This may prove valuable in C. aspersum breeding for the recognition of specific lesions, even in the absence of the predator.

Local-Global Feature Adaptive Fusion Network for Building Crack Detection.

Cracks represent one of the most common types of damage in building structures and it is crucial to detect cracks in a timely manner to maintain the safety of the buildings. In general, tiny cracks require focusing on local detail information while complex long cracks and cracks similar to the background require more global features for detection. Therefore, it is necessary for crack detection to effectively integrate local and global information. Focusing on this, a local-global feature adaptive fusion network (LGFAF-Net) is proposed. Specifically, we introduce the VMamba encoder as the global feature extraction branch to capture global long-range dependencies. To enhance the ability of the network to acquire detailed information, the residual network is added as another local feature extraction branch, forming a dual-encoding network to enhance the performance of crack detection. In addition, a multi-feature adaptive fusion (MFAF) module is proposed to integrate local and global features from different branches and facilitate representative feature learning. Furthermore, we propose a building exterior wall crack dataset (BEWC) captured by unmanned aerial vehicles (UAVs) to evaluate the performance of the proposed method used to identify wall cracks. Other widely used public crack datasets are also utilized to verify the generalization of the method. Extensive experiments performed on three crack datasets demonstrate the effectiveness and superiority of the proposed method.

Analisa dan Pemetaan Kepadatan Hutan Mangrove di Wilayah Pesisir Pantai Gresik

The mangrove forest ecosystem in Ujung Pangkah sub-district plays a very important role in the lives of living creatures around it. The management and use of mangrove ecosystems by people in this sub-district tends to lead to the conversion of land into ponds, whether in the form of forest or emerging land. Cutting down trees in mangrove gforests is one of the causes of abrasion in several areas in Indonesia. Apart from abrasion, there is also accretion or addition of land around the Bengawan Solo estuary which provides access to the Pangkahwetan and Pangkahkulon coasts. The aim is to analyzezchanges in the area of mangrove vegetationgin Ujungpangkah. This research uses a remote sensing method known as the resolution concept, namely spatial resolution, temporal resolution, spectral resolution, radiometric resolution and layer resolution. Quantitative observations were made of changes in mangrove forest area using Landsat -8 imagery. The location of the Ujungpangkah ground is based on the conditions of the study location, in accordance with the results of initial image processing. Changes in the area of mangrove vegetation when viewed from remote sensing results in 2023 and 2024 experience visible differences, the distribution of mangroves will increase in 2024, namely there will be an increase in the area of vegetation. The distribution area of mangroves always changes every year. Either in the form of addition or reduction of area. Things that can affect the extent of mangrove distribution include 2 types of damage to the mangrove ecosystem in Ujung Pangkah District, namely abrasion and deforestation. The efforts made to overcome this problem include starting mangrove planting activities in the Banyuurip Mangrove Center (BMC) area. The results of data processing from the 2023 RBI map in Ujungpangkah District recorded a total area of ​​11904.93052 ha. The area is divided into several land uses, namely Mangrove covering an area of ​​1253.24609 ha and Non-Mangrove covering an area of ​​1525.32660 ha. Meanwhile, processing data from Lansat-8 in 2024 in Ujungpangkah District, the total area was recorded at 11904.93052 ha. Mangrove land use was recorded at 10651.68443 ha and non-mangrove land at 10379.60392 ha.

Leading Edge Erosion Classification in Offshore Wind Turbines Using Feature Extraction and Classical Machine Learning

Leading edge (LE) erosion is a type of damage that inhibits the aerodynamic performance of a wind turbine, resulting in high operation and maintenance (O&M) costs. This paper makes use of a small dataset consisting of 50 images of LE erosion and healthy blades for feature extraction and the training of four types of classifiers, namely, support vector machine (SVM), random forest, K-nearest neighbour (KNN), and multi-layer perceptron (MLP). Six feature extraction methods were used with these classifiers to train 24 models. The dataset has also been used to train a convolutional neural network (CNN) model developed using Keras. The purpose of this work is to determine whether classical machine learning (ML) classifiers trained with extracted features can produce higher-accuracy results, train faster, and classify faster than deep learning (DL) models for the application of LE damage detection of wind turbine blades. The oriented fast and rotated brief (ORB)-trained SVM achieved an accuracy of 90% ± 0.01, took 80.4 s to train, and achieved inference speeds of 63 frames per second (FPS), compared to the CNN model, which achieved an accuracy of 79.4% ± 2.07, took 4667.4 s to train, and achieved an inference speed of 1.3 FPS. These results suggest that classical ML models can be more accurate and efficient than DL models if the appropriate feature extraction method is used.

Quercetin has a protective impact on human umbilical vein endothelial cells against tungsten carbide cobalt nanoparticle-induced cytotoxicity, oxidative stress, apoptosis

Oxidative stress is a pivotal factor in the pathogenesis of various cancer diseases. In fact, oxidative DNA damage is described as the type of damage probably to occur in cancer cells. This study examined the protective impact of the polyphenolic compound quercetin on human umbilical vein endothelial (HUVEC) cells against tungsten carbide cobalt nanoparticles (WC-Co NPs)-induced oxidative stress, cytotoxicity, and apoptosis. One of the most often used models for studying endothelial cells in vitro is the human umbilical vein epithelial cell. Scanning electron microscope (SEM) and transmission electron microscopy (TEM) were used to measure the size of the NPs prior to WC-Co NPs treatment. WC-Co NPs had a polygonal form and measured 45.26 ± 1 nm in size. Using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT),neutral red uptake(NRU) and lactate dehydrogenase (LDH) assays, the cytotoxicity of WC-Co NPs on HUVECs cells was assessed. The cytotoxicity of NPs increased in a concentration-dependent way. The MTT result was used to calculate the median inhibitory concentration (IC50) for HUVEC cells at 24 h, which came out to be 23.14 μg/ml. Intracellular reactive oxygen species(ROS) and lipid peroxidation(LPO) levels were elevated at 17 g/ml WC-Co NPs and then reduced in HUVECs cells upon immediate exposure to 150 µM quercetin (QR). Using JC-1 staining, the loss of mitochondrial membrane potential(MMP) in control, WC-Co NPs alone and WC-Co NPs plus QR exposed cell were evaluated. In HUVECs cells, maximum apoptotic cells were seen at increasing NPs concentrations. Based on the impacts of NPs on HUVECs cells, the data suggests that QR may work on the process of scavenging ROS, which is responsible for DNA repair. Consequently, the above findings highlight the significance of these QR as defenses against DNA damage brought on by oxidative stress, which frequently happens in a number of cancer disorders.

Prolonged exposure to NaAsO2 induces thyroid dysfunction and inflammatory injury in Sprague‒Dawley rats, involvement of NLRP3 inflammasome‒mediated pyroptosis.

Arsenic, a well-known hazardous toxicant, has been found in recent years to act as an environmental endocrine disruptor that accumulates in various endocrine organs, impeding the normal physiological functions of these organs and altering hormone secretion levels. Moreover, some research has demonstrated a correlation between arsenic exposure and thyroid functions, suggesting that arsenic has a toxicological effect on the thyroid gland. However, the specific type of thyroid gland damage caused by arsenic exposure and its potential molecular mechanism remain poorly understood. In this study, the toxic effects of sodium arsenite (NaAsO2) exposure at different doses (0, 2.5, 5.0 and 10.0mg/kg bw) and over different durations (12, 24 and 36 weeks) on thyroid tissue and thyroid hormone levels in Sprague‒Dawley (SD) rats were investigated, and the specific mechanisms underlying the effects were also explored. Our results showed that NaAsO2 exposure can cause accumulation of this element in the thyroid tissue of rats. More importantly, chronic exposure to NaAsO2 significantly upregulated the expression of NLRP3 inflammasome-related proteins in thyroid tissue, leading to pyroptosis of thyroid cells and subsequent development of thyroid dysfunction, inflammatory injury, epithelial-mesenchymal transition (EMT), and even fibrotic changes in the thyroid glands of SD rats. These findings increase our understanding of the toxic effects of arsenic exposure on the thyroid gland and its functions.

FGF21 Alleviates Hypoxic-Ischemic White Matter Injury in Neonatal Mice by Mediating Inflammation and Oxidative Stress Through PPAR-γ Signaling Pathway.

White matter injury (WMI), the most common type of brain damage in infants born preterm, is characterized by failure in oligodendrocyte progenitor cell maturation and myelination, thereby contributing to long-term neurological impairments. Regrettably, effective therapies for promoting remyelination and improving function are currently lacking for this growing population affected by WMI. Recombinant human fibroblast growth factor (rhFGF) 21 modulated microglial activation and then ameliorated brain damage and improved neurological deficits in several central nervous system diseases. However, the effects of rhFGF21 treatment on WMI in preterm infants remain uncertain. In this study, we established an in vivo mouse model of cerebral hypoxia-ischemia (HI)-induced brain WMI and an in vitro model using oxygen-glucose deprivation (OGD)-treated HMC3 cells to investigate the neuroprotective effects of rhFGF21 against WMI and elucidated the potential mechanism. Our findings demonstrated that administration of rhFGF21 significantly ameliorated the retardation of oligodendrocyte differentiation, promoted myelination, and mitigated axonal deficits, synaptic loss, and GFAP scarring, thereby improving lifelong cognitive and neurobehavioral dysfunction associated with WMI. Moreover, rhFGF21 modulated microglial polarization, promoted a shift from the M1 to the M2 microglial phenotype, and suppressed microglial activation, thus ameliorating inflammatory response and oxidative stress. Additionally, rhFGF21 treatment significantly inhibited the HMGB1/NF-κB pathway linked to inflammation, and activated the NRF2 pathway associated with oxidative stress through the upregulation of PPAR-γ. Importantly, the beneficial effects of rhFGF21 on HI-induced WMI and microglial activation were dramatically inhibited by PPAR-γ antagonist and its siRNA. Our findings provide compelling evidence that rhFGF21 treatment mitigated the inflammatory response and oxidative stress through the modulation of microglial polarization via the PPAR-γ-mediated HMGB1/NF-κB pathway and the NRF2 pathway, respectively, contributes to neuroprotection and the amelioration of WMI in neonatal mice. Thus, rhFGF21 represents a promising therapeutic agent for the treatment of neonatal WMI.

Parametric Study on Structural Performance According to the Condition Grade of Open-cut Electric Power Tunnel

In this study, the structural performance of electric power tunnels was evaluated based on the type and degree of damage. For experimental performance evaluation, a power structure test specimen was designed with a state safety performance of grade D corresponding to a concrete damage area ratio of 44% and structural safety performance of grade D with a reduced cross-section of 25% of the main reinforcement of the upper slab. The electric power structures with grade D state safety performance and structural safety performance exhibited 63% load-bearing capacity compared to those without damage. Cracks occurred on the outside of the structure under the experimental conditions simulating the overburden load, implying the possibility of corrosion of the outer reinforcing bars of the real structure. Finite element analysis showed that reducing the area of the outer main rebar of the upper slab caused more significant reduction in the load-bearing capacity than that of the inner main rebar.

Performance Evaluation of RC Structures using Next- Generation Performance-Based Seismic Assessment Procedures

Seismic forces have wreaked havoc on buildings around the world, resulting in both property damage and human deaths. Reinforced concrete structures under cyclic loading cannot be predicted using current methods, according to relevant design codes. Code-based seismic design procedures have been replaced by performance-based design procedures (PBSD). PBSD describes a building's overall performance by taking into account its structural and non-structural performance categories. Immediate occupancy, life safety, and collapse prevention are the three types of damage that can be encountered in a construction site. They are ranked based on the amount of damage, downtime, and casualties they inflict. Although these procedures can detect damage, they are unable to assign a numerical value to the seriousness of the damage. The use of damage indices, which are based on structural and response-based parameters, has been proposed by many researchers in the past. The objective of current research is an attempt to summarise all of these efforts and identify grey areas for further investigation. Numerical approaches to integrate structural damages with various PBSD performance levels have been proposed.

Damage Proportion Analysis of the Combined High and Low Cycle Fatigue Based on the Continuum Damage Mechanics

ABSTRACTA combined high and low cycle fatigue (CCF) life prediction model, considering creep, low‐cycle fatigue (LCF), high‐cycle fatigue (HCF) at the maximum LCF nominal stress (HLCF) damages, and the interaction damage between LCF and HLCF, is proposed. The proportions for these four types of damage in total CCF damage are quantified. Compared with the existing CCF models, the CCF model proposed in this paper considers creep damage in CCF and has higher accuracy. The escalation in HCF stress amplitudes leads to reduced CCF life owing to the augmentation of HLCF and interaction damages. The increase in the cycle ratio of HCF to LCF, causing a reduction in CCF life is ascribed to elevated HLCF and creep damages. The calculated damage proportion results from the proposed model are consistent with the observations of the fracture characteristics using a scanning electron microscope (SEM), indicating the necessity of considering creep damage in CCF life prediction at high temperatures.

Ameliorative Potential of Menstrual Blood-derived Endometrial Stem Cells in Alcohol-Induced Fatty Liver Disease

Background: Alcohol-induced fatty liver disease (AFLD) begins with steatosis and may progress to a range of pathological liver changes, including fibrosis, cirrhosis, and complications. Menstrual blood-derived endometrial stem cells (MenSCs) have shown potential therapeutic effects against various types of liver damage. However, the liver-protective effects of MenSCs in AFLD are not well understood. This study aimed to evaluate the therapeutic effects of MenSCs on AFLD progression. Methods: MenSCs were sourced from women in good health (N=5, 25-34 years old). Male C57BL/6 mice were separated into three distinct groups to establish the mouse models. The AH/- MenSCs group received MenSCs (5×105 cells/mouse) transplantation through tail injection on the 7th and 13th days following the initiation of the alcohol-induced fatty liver model. The therapeutic effects of MenSCs transplantation in AFLD mouse models were subsequently explored using qPCR, Western blotting, histopathological examination, and mRNA sequencing analysis. Results: MenSCs significantly improved liver function and reduced lipid accumulation in AFLD. Treatment with MenSCs was also found to reduce the expression levels of inflammatory cytokines and profibrotic markers in the liver tissues of the mouse model. Additionally, the MenSCs- treated group demonstrated a significant reduction in endoplasmic reticulum (ER) stress and oxidative stress, along with an increase in autophagic activity. Conclusion: The findings provided preliminary evidence of the multifaced protective effects of MenSCs in AFLD.

Heavy Work Investment (HWI) and Its Effect on Employees’ Physical and Mental Health

Abstract Background Economic reality and centrality of work have led to employees investing much time and effort in work. However, The number of hours spent at work may not be the only explanation, and other characteristics, such as type of work, employees’ personality, economic status, motivations, etc., need to be considered. The Heavy Work Investment model (Snir & Harpaz, 2012) considers these variables and classifies employees into four types of investors. This study examines the physical and mental health consequences of each HWI group. Methods Participants (N = 962) were workers who came to a medical center for annual medical screenings. About 70% were males, and the average age was 50.13 years (SD = 9.53). They divided into 5 groups: Typical full-time workers (N = 208, 29.2%), ‘Needy’ (N = 111, 15.6%), ‘Employer directed’ (N = 111, 15.6%), ‘Workaholic’ (N = 192, 26.9%) and ‘Work devoted’ (N = 91, 12.7%). The personal data was cross-referenced with the respondents’ health data. Differences for categorical variables were examined with Chi-square analyses. Results ‘Employer-directed’ employees, more than ‘work-devoted’ employees, perceived their health status as preventing them from performing mild activities. ‘Employer-directed’ and ‘needy’ employees, more than ‘work-devoted’ employees, perceived their health status as interfering with their social activities and their pain as interfering with their regular activities. ‘Workaholic’ employees suffered from more diseases than ‘work-devoted’ employees, and they were found to be 3.70 times more likely to be at a high risk of cardiovascular disease than typical full-time workers. Conclusions It is possible to anticipate types of health damage according to occupation type and develop occupation-adjusted health promotion programs. It is necessary to base labor laws on protecting employees’ health, particularly regarding time and workload’ outside of work’ in both hours (additional or flexible) and location (hybrid work). Key messages • Inspire organizations to be aware of potential injuries caused by HWI and promote the creation of intervention programs, potentially significantly improving employees’ health and well-being. • Evidence for the necessary laws that protect employees’ health, particularly regarding time and workload ‘outside of work’ in both hours (additional or flexible) and location (hybrid work).

One-year risk of all-cause death and major cardiovascular events in patients presenting with hypertensive crisis. A report from a global federated research health network

Abstract Background Few data are available about the clinical course of patients presenting with hypertensive crisis who are discharged alive from hospital. Purpose To assess the long-term risk of adverse events in patients with hypertensive crises. Methods Retrospective study utilizing a research health network. Based on the ICD-10-CM codes recorded between 2000 and 2022, from 85 health care associations mainly located in the United States, patients with hypertensive crisis were subdivided into hypertensive urgencies (I16.0) and hypertensive emergencies (I16.1). In those with hypertensive emergencies, the type of target organ damage was reported, ie. central nervous system (ischemic stroke, hypertensive encephalopathy, intracerebral hemorrhages), cardiovascular (CVS: myocardial infarction (MI), heart failure (HF), aorta dissection (AD)), or renal (acute kidney failure). Primary outcomes were the one-year risks of all-cause death, and major cardiovascular events (MACE: MI, stroke, cardiac arrest, AD, and HF). Secondary outcomes were the risks for each type of MACE. Cox regression analysis after propensity score matching (PSM) 1:1 was used to produce hazard ratios (HRs) and 95% Confidence Intervals (95%CIs). Results Overall, we identified 25 294 patients with hypertensive emergency (age 62.4±15.7, 46.1% females) and 21,737 patients with hypertensive urgency (age 63.5±17.2, 55.5% females). Patients with hypertensive emergency were more likely males, Black or African American origin and showed a higher prevalence of chronic hypertensive-related complications, vs. those with hypertensive urgency. After PSM, patients with hypertensive emergency showed a higher risk of all-cause death (HR, 1.34, 95%CI 1.25-1.44) and MACE (HR 4.09, 95%CI 3.87-4.33), vs. those with hypertensive urgency. Of the secondary outcomes, patients with hypertensive emergency had increased risks of MI (HR 3.33, 95%CI 3.03-3.67), stroke (HR 4.73, 95%CI 4.33-5.17), cardiac arrest (HR 1.30, 95%CI 1.07-1.58), AD (HR 5.49, 95%CI 3.90-7.73), and HF (HR 3.01, 95%CI 2.74-3.14). All the different types of organ involvement during the hypertensive emergency were each associated with similar long-term risks of adverse events (Figure 1). Conclusion Patients with hypertensive emergency have a high long-term risk of MACE and all-cause death. Preventing the onset of target organ damage in patients with hypertensive crisis is crucial to mitigate their long-term risk of adverse events.

Design and Implementation of Small Modular Amphibious Robot System

Various marine engineering facilities have been eroded by marine organisms and wind waves for a long time, resulting in different types of damage to the surface of marine engineering facilities, such as the pile legs of offshore platforms. Therefore, in order to carry out safety inspections and other work on marine engineering facilities, a small amphibious robot structure system and a set of control systems adapted to it are independently developed. Various problems such as the modular design of the structure, composite motion mode, adsorption stability, wall adaptability of the crawling mode, and flaw localization have been solved by means of three-dimensional modeling, mechanical analysis, simulation, and electronic design. At the same time, a set of control systems including hardware and software is developed for the amphibious robot. In order to improve the stability and efficiency of the amphibious robot working underwater, a sliding mode control algorithm based on the exponential reaching law and saturation function is designed. For the fixed depth and fixed heading control functions, the sliding mode control algorithm and the PID control algorithm are simulated and compared. Finally, several types of experiments are carried out for the amphibious robot. The simulation and experimental results show that all the functions of the amphibious robot meet work requirements, such as the motion performance of the composite motion mode. Compared with the PID control algorithm, the sliding mode control algorithm has a faster response speed and better stability, which is conducive to the efficient and stable work of the amphibious robot underwater.

Numerical simulation of the temporal and spatial evolution of sandstone pore type reservoir damage types and severity

During the oilfield development process, various factors can cause different types of reservoir damage, leading to reduced oil well production or even shutdown, and decreased water injection capacity in water wells, resulting in significant economic losses for the oilfield. However, formation damage control measures must be based on the quantitative diagnosis of the types and degrees of reservoir damage. This paper establishes a spatiotemporal evolution numerical model for 12 common types of damage during the oil and gas exploration and development process, based on the material balance theory and Fick’s diffusion law in reservoir damage processes. This model achieves numerical simulation of the degree of various reservoir damage types in different spatiotemporal domains. The overall damage degree of a specific well’s evolution with time and space is further simulated in simple superposition way. The sequential core flow experiment was carried out in the laboratory, and then compared with the calculation results. The accuracy is above 90%. Finally, using field test data, the simulation results show a 95% or higher degree of agreement with the actual field measurements, proving that the reservoir damage spatiotemporal evolution quantitative simulation technology established in this paper has high accuracy and practicality.

Diagnosis of marine internal combustion engines by means of rapidly variable temperature and composition of exhaust gas as an alternative or support for currently used diagnostic methods

The article points out relevance of parametric diagnostics of ship engines and analyzes the state of research in this field. A method is proposed for diagnosing engine systems on the basis of rapidly variable exhaust temperature while measuring its composition. A method for determining diagnoser tools from the signal within one engine cycle and mathematical and statistical treatment of test results is presented. The products of numerical moddeling in the Diesel-RK software and the products of laboratory research on a Farymann Diesel test engine were analyzed. Affect of the most popular defects on the analyzed parameters was defined. Criteria for matching a diagnoser tool in accordance with the type of damage in a ship engine was presented. A methodology was proposed for adapting the presented method to metering on a ship engine in operation.