Correlating Standard Penetration Test (SPT) with Various Soil Properties in Different Kirkuk City Locations: A Case Study Utilizing Inverse Distance Weighted (IDW) for Assessment and Prediction

Due to cost limitations, it is not practicable to experimentally investigate the soil characteristics over the entire city. Given this, the study has focused on using a geographic information system, especially the IDW technique, with linear regression models. The study's data collection was taken from different locations around Kirkuk province. The IDW technique was used to examine the Standard Penetration Testing (SPT) and chemical properties such as total Sulphur content SO3 (%), total soluble salt TSS (%), organic content ORG (%), chlorine concentration Cl (ppm), free calcium carbonate content CaCO3 (%), Gypsum content GYP (%), and pH. Both single-regression and multi-regression models were utilized to interpolate the SPT and soil properties. Sets of digital maps were created to examine the chemical properties and SPT of Kirkuk soils. SPT values can be predicted more precisely based on integrated physical and chemical soil properties rather than chemical or physical characteristics alone. SPT and physical soil components have been shown to have various positive and negative relationships. While the SPT values have shown favorable relationships with both silt and clay amounts, they have shown negative correlations with gravel and sand contents. The variations of SPT with chemical soil properties have revealed positive correlations with SO3 (%), TSS (%), CaCO3 (%), GYP (%), and pH contents, while negative correlations were obtained between SPT with ORG (%) and Cl (ppm)

Correlating Standard Penetration Test (SPT) with Various Soil Properties in Different Kirkuk City Locations: A Case Study Utilizing Inverse Distance Weighted (IDW) for Assessment and Prediction

Due to cost limitations, it is not practicable to experimentally investigate the soil characteristics over the entire city. Given this, the study has focused on using a geographic information system, especially the IDW technique, with linear regression models. The study's data collection was taken from different locations around Kirkuk province. The IDW technique was used to examine the Standard Penetration Testing (SPT) and chemical properties such as total Sulphur content SO3 (%), total soluble salt TSS (%), organic content ORG (%), chlorine concentration Cl (ppm), free calcium carbonate content CaCO3 (%), Gypsum content GYP (%), and pH. Both single-regression and multi-regression models were utilized to interpolate the SPT and soil properties. Sets of digital maps were created to examine the chemical properties and SPT of Kirkuk soils. SPT values can be predicted more precisely based on integrated physical and chemical soil properties rather than chemical or physical characteristics alone. SPT and physical soil components have been shown to have various positive and negative relationships. While the SPT values have shown favorable relationships with both silt and clay amounts, they have shown negative correlations with gravel and sand contents. The variations of SPT with chemical soil properties have revealed positive correlations with SO3 (%), TSS (%), CaCO3 (%), GYP (%), and pH contents, while negative correlations were obtained between SPT with ORG (%) and Cl (ppm)

SQL Injection Attacks Prevention System Technology: Review

The vulnerabilities in most web applications enable hackers to gain access to confidential and private information. Structured query injection poses a significant threat to web applications and is one of the most common and widely used information theft mechanisms. Where hackers benefit from errors in the design of systems or existing gaps by not filtering the user's input for some special characters and symbols contained within the structural query sentences or the quality of the information is not checked, whether it is text or numerical, which causes unpredictability of the outcome of its implementation. In this paper, we review PHP techniques and other techniques for protecting SQL from the injection, methods for detecting SQL attacks, types of SQL injection, causes of SQL injection via getting and Post, and prevention technology for SQL vulnerabilities

Risk of COVID-19 after natural infection or vaccinationResearch in context

Summary: Background: While vaccines have established utility against COVID-19, phase 3 efficacy studies have generally not comprehensively evaluated protection provided by previous infection or hybrid immunity (previous infection plus vaccination). Individual patient data from US government-supported harmonized vaccine trials provide an unprecedented sample population to address this issue. We characterized the protective efficacy of previous SARS-CoV-2 infection and hybrid immunity against COVID-19 early in the pandemic over three-to six-month follow-up and compared with vaccine-associated protection. Methods: In this post-hoc cross-protocol analysis of the Moderna, AstraZeneca, Janssen, and Novavax COVID-19 vaccine clinical trials, we allocated participants into four groups based on previous-infection status at enrolment and treatment: no previous infection/placebo; previous infection/placebo; no previous infection/vaccine; and previous infection/vaccine. The main outcome was RT-PCR-confirmed COVID-19 >7–15 days (per original protocols) after final study injection. We calculated crude and adjusted efficacy measures. Findings: Previous infection/placebo participants had a 92% decreased risk of future COVID-19 compared to no previous infection/placebo participants (overall hazard ratio [HR] ratio: 0.08; 95% CI: 0.05–0.13). Among single-dose Janssen participants, hybrid immunity conferred greater protection than vaccine alone (HR: 0.03; 95% CI: 0.01–0.10). Too few infections were observed to draw statistical inferences comparing hybrid immunity to vaccine alone for other trials. Vaccination, previous infection, and hybrid immunity all provided near-complete protection against severe disease. Interpretation: Previous infection, any hybrid immunity, and two-dose vaccination all provided substantial protection against symptomatic and severe COVID-19 through the early Delta period. Thus, as a surrogate for natural infection, vaccination remains the safest approach to protection. Funding: National Institutes of Health