Short Tip Research Articles

The Use of Short Dilator Tip in Endovascular Branched Arch Repair: A Case Series.

The aim of the study was to investigate the safety and feasibility of branched endovascular arch repair (b-TEVAR) with a custom-made double or triple inner branched arch endograft using a short dilator tip (35 mm) in patients with aortic arch pathologies. Retrospective analysis of all consecutive patients undergoing b-TEVAR with a short dilator tip for the treatment of aortic arch pathologies in a high-volume tertiary center between January 2019 and July 2023. The combined primary endpoint was technical success and perioperative complications caused by the endograft, including tip-induced cardiac injury and trackability issues. Secondary endpoints were major adverse events (MAE), including morbidity, mortality, and reinterventions within 30 days. During a 4-year period, 22 patients (median age 72 years, 16 males) were treated with a custom-made double or triple inner-branched TEVAR for different aortic arch pathologies using a short dilator tip (35 mm). After initial exclusive treatment of patients with previous valve replacement, the use of a short dilator tip became standard. Eighteen patients received a triple- and 4 patients received a double-branched endograft. Seventeen patients (77.3%) underwent elective treatment, while 5 patients underwent urgent repair due to contained rupture or symptomatic aneurysms. The technical success was 100%. No tip-induced cardiac mortality and morbidity occurred perioperatively. The trackability of the device was in no case affected by the short tip. Within 30 days, the MAE rate was 45%, including one death. No re-intervention had to be performed. Endovascular aortic arch repair with inner-branched arch endografts using a short dilator tip (35 mm) appears to be safe and technically feasible and could potentially reduce the risk of fatal myocardial injuries. Due to safe and stable maneuverability and deployment of endograft in zone 0 the use of short dilator tip might have the potential to become standard in endovascular branched arch repair. This is one of the first reports on the use of short dilator tip and associated complications in endovascular branched arch repair.

A new species of the Trichia botrytis complex from the cloud forest in Ecuador

The paper describes a new myxomycete species, Trichia tuberculata, from the Ecuadorian cloud forest. The phylogeny constructed with nuclear 18S rDNA and mitochondrial 17S rDNA sequences indicates that the taxon is closely related to the recently described species T. acetocorticola, T. nubila, and T. pinicola, all within the T. botrytis complex. The morphology of the inner peridium surface and capillitium also aligns T. tuberculata with these species. However, the distinctive tuberculate peridium, short elater tips, and perhaps the distribution range (so far found in the equatorial zone only) distinguish T. tuberculata from related taxa.

Fenestrated Endovascular Repair Using Short Tipped Distal Components with No Cross Concept to Prevent Crushing of Target Vessel Bridging Stents

To compare and evaluate early and midterm outcomes of a "no cross" novel approach with short tip vs. standard tip introducer systems for all distal components to prevent target vessel bridging stent kink or collapse during fenestrated endovascular aortic repair (FEVAR). A retrospective analysis was conducted on all patients who underwent FEVAR at a tertiary referral centre between October 2016 and July 2022. The inclusion criterion was the use of renal artery fenestrations. Patients who had chronic dissections were included. Endpoints were analysed in two groups comprising the "no cross" group and the standard group, with all cases being consecutive in their respective groups. Cone beam computed tomography was used intra-operatively in all cases, and post-operative compute tomography angiograms and re-interventions were reviewed. Primary endpoints included technical success, intra-operative adjunctive procedures, adverse events related to the fenestration, and re-interventions, while secondary endpoints were secondary interventions and overall mortality. A total of 70 patients (35 in each group) were enrolled in the study, with 64 (91%) having juxta-renal aneurysms. There were no differences in demographics, cardiovascular risk factors, or aneurysm characteristics between the two groups. The "no cross" group demonstrated a significantly higher technical success rate (100% in all cases) compared with the standard group (29 cases, 83%; p = .010). Additionally, there were statistically significantly fewer intra-operative adjunctive procedures required in the "no cross" group (1.5% of fenestrations) compared with the standard group (8.2% of fenestrations) (p = .013). Overall median follow up was 32 months (interquartile range 22, 62 months). Implementation of a novel "no cross" concept during FEVAR, utilising a short dilator introducer tip on the distal bifurcated component and iliac extensions, significantly reduces intra-operative fenestration related adverse events and enhances technical success. Further studies with larger patient populations and longer follow up are needed to confirm these findings.

RESEARCH OF SUPERSONIC FLOW IN SHORTENED NOZZLES OF ROCKET ENGINES WITH A BELL-SHAPED TIP

The flow in a shortened nozzle with a bell-shaped tip is considered. A comparison of the wave structures of the supersonic gas flow in shortened nozzles with short and long tips formed by compression and stretching of the original bell-shaped nozzle for connection, respectively, with the long and short conical part of the base nozzle at the same nozzle length was carried out. Under operation conditions at sea level and low pressure at the nozzle inlet (P0<50·105 Ра), a large-scale vortex structure, starting from the corner point of the nozzle inlet, is observed in both nozzles. In addition, in the long tip, a small-scale vortex is observed on the wall near its cut. A barrel-shaped wave structure of hanging jumps with a closing Mach disc is formed in the flow in both nozzles, inside which a "saddle-shaped" wave structure of low intensity is noticed. In the separation flow in the tip (when Р0<50·105 Ра and Рн = 1·105 Ра), the pressure on the wall in the separation zone is slightly lower (by ≈ 5-10%) than the external pressure Рн. When the engine is operating in the upper layers of the atmosphere, the static pressure on the section of both tips is proportional to the pressure at the entrance of the nozzle. In the cross-section, starting from the axis of the nozzle to ~0.89 R/Ra (the ratio of the current value of the radius R to the radius of the nozzle wall at the outlet Ra), the pressure decreases to a value proportional to the pressure at the nozzle inlet. Then, it increases linearly to the value of the pressure on the tip wall, which is proportional to the pressure at the nozzle inlet. This is due to the wave structure of the flow inside the nozzle. It was established that with a decrease in the length of the nozzle conical part, the impulse coefficient of the nozzle decreases significantly for operating at sea level and slightly decreases for operating in the upper layers of the atmosphere. The results of calculations correlate satisfactorily with the experimental study results of the flows in shortened nozzles with a bell-shaped tip

Radiofrequency ablation for solitary T1N0M0 papillary thyroid carcinoma in the danger triangle area: a preliminary analysis

Objectives To evaluate the feasibility, efficacy, and safety of radiofrequency ablation (RFA) for solitary T1N0M0 papillary thyroid carcinoma (PTC) in the danger triangle area. Methods 94 participants (mean age 44.45 ± 13.08; 73 females) with solitary T1N0M0 PTC in the danger triangle area who underwent percutaneous RFA at the hospital from January 2018 to April 2020 were retrospectively analyzed. Key ablation procedures included sufficient paratracheal fluid isolation, low-power, and short active tip (5 mm working electrode). Tumor size changes at different time points after RFA, technical success rates, tumor disappearance, disease progression, and complications were recorded and compared. Results Contrast-enhanced ultrasonography revealed that complete tumor ablation was performed with a 100% success rate in these patients. Post-ablation, the maximum diameter and volume of the ablation zone increased at the first and third month (p < 0.001), followed by a gradual decrease in size, without significant difference by the 6th month. The tumor disappearance rate was 76.59% (72/94), with higher rates in the T1a group compared to the T1b group (80% [64/80] VS57.1% [8/14], p < 0.001). There were no local recurrences. The incidence of new lesions and LNM was 3.2% (3/94), limited to the T1a subgroup. Further ablation was successfully applied to all new lesions and LMN. Mild voice changes were the only complication, with a rate of 3.2% (3/94), resolved within 4 months after RFA. Conclusions Sufficient paratracheal fluid isolation combined with a low-power, short active tip radiofrequency ablation strategy is a safe and effective method for treating solitary T1N0M0 PTC in the danger triangle area.

SeisMIC - an Open Source Python Toolset to Compute Velocity Changes from Ambient Seismic Noise

We present SeisMIC, a fast, versatile, and adaptable open-source software to estimate seismic velocity changes from ambient seismic noise. SeisMIC includes a broad set of tools and functions to facilitate end-to-end processing of ambient noise data, from data retrieval and raw data analysis via spectrogram computation, over waveform coherence analysis, to post-processing of the final velocity change estimates. A particular highlight of the software is its ability to invert velocity change time series onto a spatial grid, making it possible to create maps of velocity changes. To tackle the challenge of processing large continuous datasets, SeisMIC can exploit multithreading at high efficiency with an about five-time improvement in compute time compared to MSNoise, probably the most widespread ambient noise software. In this manuscript, we provide a short tutorial and tips for users on how to employ SeisMIC most effectively. Extensive and up-to-date documentation is available online. Its broad functionality combined with easy adaptability and high efficiency make SeisMIC a well-suited tool for studies across all scales.

Improving placement learning at scale: a case study evaluation

PurposeIn this study, the authors explore students' and industry’s perceptions about the challenges and opportunities of participating in a large-scale, non-compulsory, individual, in-person and unpaid business placement programme at an Australian university. The placement programme aims to support students' workplace transition by emphasising the development of key employability skills through reflective learning and linking theory to practice.Design/methodology/approachUtilising a case study methodology and integrating survey questionnaires, the authors collected both quantitative and qualitative data with large sample sizes.FindingsThe results highlight curriculum areas for improvement, emphasising tailored feedback to manage placement expectations and addressing employability skill strengths and weaknesses.Practical implicationsRecommendations include co-partnering with students to develop short, tailored and hot tip videos along with online learning modules, including the presentation of evidence-based statistics to inform students about post-programme employment prospects.Originality/valueThe study contributes to benchmarking good practices in non-compulsory, individual, in-person and unpaid placement pedagogy within the business education context.

Energy-saving discharge needle shape for electrohydrodynamic airflow generation

Electrohydrodynamics (EHD) is a way to produce low energy-consuming airflow without moving components. The basis of airflow by EHD is corona discharge. A way to generate corona discharge is done, among others, via needle-type emitter electrodes whose shape and arrangement play a crucial role in the effectiveness of the discharge. Until now, the needle shape was chosen somewhat arbitrarily, although it impacts the energy consumption of the EHD process. We lack systematic studies on the impact of needle shape on the EHD discharge process and associated airflow to help engineers and scientists choose the best shape. This in-silico study screens the impact of the needle shape parameters on EHD performance in terms of electrical power consumption and airflow generation. The study aims to find the ideal EHD needle shape for unrestricted and confined flow. For this purpose, we test three different geometrical configurations. The first configuration is a free-flow single-needle configuration. The second configuration adds a dielectric nearby, which represents a needle enclosure. Lastly, a configuration including a dielectric and a converging nozzle is examined. All studies use a 2D-axisymmetric, fully automatized EHD physics-based model. The first set of parametric studies explores the inherent geometrical properties of the needle shape, like tip radii (10–250 μm), needle cone angle (10–70°), and needle diameters (0.5–2 mm). The second set of parametric studies investigates the operation conditions, such as the emitter-collector distance (10–40 mm), the nozzle contraction ratio (0.04–1), and the operating voltage (6–32 kV). The results of the free-flow configuration show qualitative agreement with experiments on existing needle products. The ideal energy-saving needle shape for free flow configuration features a short conical tip length (i.e., a large angle ≥30°), a diameter of 2 mm, and a needle rip radius of 100 μm. The situation changes when a dielectric is present, and a sharp angle of 10° is favorable to reduce energy consumption. Since a dielectric inverts the optimal needle shape, it makes sense to customize it for a particular application in EHD airflow generation. We provide performance maps that can be used as design charts. This study is a guideline to optimize EHD devices further to reduce energy consumption and increase airflow speed.

Ultrasound-guided percutaneous retrieval of non-radiopaque radial line using a microsnare

Radial arterial lines are inserted in critically ill patients admitted to hospital intensive care units for continuous monitoring of their blood pressure. On removal the line can rarely become transected, potentially leading to thrombosis of the radial artery. Retrieval of the broken fragment can be achieved by open surgery, however other retrieval methods using ultrasound-guidance have been performed as they are considered safer and less invasive. We describe our technique of ultrasound-guided percutaneous retrieval of a broken non-radioopaque radial line in one patient, which involved the use of a microsnare. Under local anaesthesia and ultrasound guidance, a 6 Fr 5.5 cm short brite tip sheath was introduced into the radial artery, followed by a microsnare which was used to capture the arterial line, track the line back into the sheath and remove it uneventfully. The use of a microsnare under ultrasound-guidance is only one method to retrieve transected radial lines, with other interventional methods described in the literature. It enables a minimally invasive and safer approach to this potentially critical challenge and can help affected patients avoid open surgery to achieve the same management outcome.

Stochastic chain termination in bacterial pilus assembly

Adhesive type 1 pili from uropathogenic Escherichia coli strains are filamentous, supramolecular protein complexes consisting of a short tip fibrillum and a long, helical rod formed by up to several thousand copies of the major pilus subunit FimA. Here, we reconstituted the entire type 1 pilus rod assembly reaction in vitro, using all constituent protein subunits in the presence of the assembly platform FimD, and identified the so-far uncharacterized subunit FimI as an irreversible assembly terminator. We provide a complete, quantitative model of pilus rod assembly kinetics based on the measured rate constants of FimD-catalyzed subunit incorporation. The model reliably predicts the length distribution of assembled pilus rods as a function of the ratio between FimI and the main pilus subunit FimA and is fully consistent with the length distribution of membrane-anchored pili assembled in vivo. The results show that the natural length distribution of adhesive pili formed via the chaperone-usher pathway results from a stochastic chain termination reaction. In addition, we demonstrate that FimI contributes to anchoring the pilus to the outer membrane and report the crystal structures of (i) FimI in complex with the assembly chaperone FimC, (ii) the FimI-FimC complex bound to the N-terminal domain of FimD, and (iii) a ternary complex between FimI, FimA and FimC that provides structural insights on pilus assembly termination and pilus anchoring by FimI.

Insta-Jig: A Quick-fix Chairside Mini-implant Placement Guide

Microimplants have changed the face of orthodontic clinical practice. One of the most important factors in a practice is reduced chairside time for the patient as well as the clinician. This article presents a short clinical tip for accurate placement of microimplant.

Adaptive long wave-infrared camouflage using an all-dielectric metasurface

All-dielectric metamaterials consisting of high-index, sub-wavelength, and periodically decorated arrays allow for efficient manipulation of electromagnetic permittivity and permeability with lower losses at the optical frequencies. In this study, we propose a planar multilayer structure composed of dielectric interlayers (Al2O3/Ge/ITO/Soda Lime Glass) to achieve perfect and broadband absorption of mid- and long-infrared (IR) wavelengths. Analyzing the spectral properties of the designed structure proved that it possesses exquisite importance in thermal application when considering the IR signature reduction in the long wavelength range, as well as the reduced radiated energy dissipation along with the undetected band and the requirements for IR camouflage. This intrinsic merit of dielectric metamaterials stems from their inherent selective absorption/emission. In that respect, Kirchhoff's law states that the emissive and absorptive powers of all bodies are similar for radiation of the same wavelength at the same temperature. The temperature difference may occur not only from the properties of the surfaces but also from the optical properties of materials and environmental conditions. Studying the thermal camouflage at different background temperatures found that the camouflage material substantially reduces the contrast between the target and the background. Beyond that, extensive assessments validated that the contrast in the resulting short tips is due to the differences in the reflective properties of the material and the background. Our simulations and experiments lay the groundwork for structuring cost-effective all-dielectric thermal camouflage metaplatforms with high performance and the strong potential to be employed in practical military and defense applications.

PO-02-193 A COMPARISON OF THIRD GENERATION CRYOABLATION VERSUS X3 LASER BALLOON SYSTEMS FOR PULMONARY VEIN ISOLATION FOR TREATMENT OF ATRIAL FIBRILLATION

As the incidence of atrial fibrillation (AF) increases operators are looking to improve the efficiency of pulmonary vein isolation (PVI) with similar clinical outcomes. In a recent study the 2nd generation cryo-balloon (CB) and the 1st and 2nd generation laser balloon (LB) was compared with similar clinical efficacy but with shorter procedure time in the CB group. Improvements were made to both modalities in subsequent generation catheters. The 3rd generation CB (CB3) has a 40% shorter tip that allows for improved stability during cryo-applications. The X3 LB (LB3) introduced a “rapid” ablation mode which utilizes a motorized handle to allow for continuous 360-degree energy delivery to decrease ablation time and improve lesion effectiveness We sought to compare if these improvements impacted the overall efficacy, procedural and/or fluoroscopy time between the two modalities. To compare clinical outcomes of CB3 and X3 LB ablation in patients with AF in a multi-center prospective registry. Between November 2019 and November 2020, 69 patients with atrial fibrillation underwent ablation with either CB3 or LB3 at two large US medical centers. Patients were followed for at least 180 days after index procedures. The primary outcome was time to recurrence of AF. Secondary outcomes included time to anti-arrhythmic drug (AAD) therapy after the 90-day blanking period, and procedural characteristics. A total of 69 patients were enrolled in the study (baseline characteristics in Table 1). Forty patients (58%) underwent PVI ablation with CB3, and 29 patients (42%) underwent PVI ablation with LB3. There was no significant difference in the time to recurrent AF between treatment groups (p=0.865) (Figure 1). There was also no significant difference in the time to treatment with AAD therapy after the 90-day blanking period (p=0.125). Both procedural and fluoroscopy time were significantly shorter in the LB group (mean procedure time was 122 minutes in CB3 group versus 104 minutes in LB3 group and mean fluoroscopy time of 19.4 minutes in CB3 group versus 6.7 minutes in LB3 group) which was statistically significant for both parameters (p<0.001). There was no significant difference in adverse events between the two groups. LB and CB are safe and effective PVI modalities. Using the X3 LB system, procedure and fluoroscopy time were shorter than with the CB3 system with similar efficacy and safety. Larger prospective randomized studies are needed to confirm these results.

Dean Flemming. Foretaste of the Future: Reading Revelation in Light of God’s Mission

Dean Flemming. <i>Foretaste of the Future: Reading Revelation in Light of God’s Mission</i>

A novel controllable cannula with a short flexible tip for reintervention after stent-by-stent placement in malignant hilar biliary obstruction

N/A.

A novel controllable catheter with a short flexible tip for guidewire insertion in severe malignant hilar biliary stricture.

A novel controllable catheter with a short flexible tip for guidewire insertion in severe malignant hilar biliary stricture.

OGBN O06 Sharing Experience of SpyGlass™ Discover and ElectroHydraulic Lithotripsy in Treating Large Bile Duct Stone Through the Trans-Cystic Approach During Laparoscopic Cholecystectomy

Abstract Background The one session management of gallstone (GS) disease associated with bile duct stone (BDS) involves laparoscopic cholecystectomy (LC) with bile duct exploration, which remains the gold standard treatment. A two-session management with ERCP followed by laparoscopic cholecystectomy, subjects patients to preventable ERCP related risks including perforation, bleeding, pancreatitis, incomplete clearance and repeat tests, especially if patient is fit and keen for cholecystectomy. Trans-Cystic bile duct exploration (TC-BDE) appears to have less morbidity than Trans-Ductal BDE (TD-BDE). However, large BDS remain the main challenge for the Trans-Cystic (TC) approach, in addition to factors such as, difficult anatomy and proximally located stones. The development in technology and evolving of spyglass DiscoverTM as 3.6mm choledochoscope with Lockable four-way steering and short tip deflection, that could utilize the electrohydraulic lithotripsy (EHL) has made the TC approach to manage large BDS possible. The aim of this abstract is to share our experience in the utilisation of the spyglass discovery TM and SG-EHL in management of large BDS using the TC approach. Methods Data from laparoscopic cholecystectomies performed by a single surgeon in Tayside NHS between 01/07/2020 and 01/06/2022 has been prospectively collected and evaluated. During the study period, 205 laparoscopic cholecystectomies were performed. From the 205 cases, 118 cases were emergency, and 140 cases involved female patients. Spyglass discover TM and SG-EHL were used in four cases, which will be discussed in the results section. Results Cases-1: 39-year-old female with 12mm BDS. Related medical history includes: 1-Right-nephrectomy that was complicated with abdominal abscess 17 years-ago. 2-Failed ERCP that was complicated with necrosis and collection, necessitating an anterior abdominal drain 2 months ago. TC-BDE and clearance was secured with SG-EHL. Abdominal drain for 5-days. Patient discharged home Day 5. Case-2: A 51-year-old male with alcoholic liver cirrhosis and ascending cholangitis due to 17mm BDS and Gallstone. Trial of TC-BDE that was converted to transductal due to friable inflamed cystic-duct and proximal location of BDS at the confluence. Successful SG-EHL helped in minimizing the size of duct opening. Cystic duct biliary drain, and abdominal drain were placed. CD drain was removed after clear tube cholangiography Day 3. Patient developed bile leak that was treated conservatively, and patient discharged after 15-days, abdominal drain was removed after 8-weeks. Case-3: 71-year-old female with 15mm BDS was cleared trans-cystically using SG-EHL. No abdominal drains. Patient had raised inflammatory marker post-surgery treated with antibiotics and patient discharged home Day 4. Case-4: 64-year-old male with12 mm BDS, with previous failed ERCP due to complex duodenal diverticula, TC-BDE and clearance was achieved using SG-EHL LC. Abdominal drain was removed and patient discharge home Day 2. Conclusions This study demonstrates that one session management of large BDS associated with GS, is safe and feasible using trans-cystic approach, with the utilization of the TC approach along with the available technology, the SpyGlass™ Discover and electrohydraulic lithotripsy. Although, the transductal approach might be necessary to ensure bile duct clearance, utilizing SG-EHL might prove beneficial in reducing the size of bile duct opening. Discussion with the patient and informed consent are essential to ensure Patient-specific therapy. A one session management of GS disease should be offered to patients, if indicated, with available support and expertise. More training opportunities in Laparoscopic bile duct exploration is needed to increase the patient's chance of receiving the gold standard treatment for BDS associated with GS.

Ultra-high-resolution assessment of lesion extension after cryoballoon ablation for pulmonary vein isolation.

Unrecognized incomplete pulmonary vein (PV) isolation during the index procedure, can be a major cause of clinical recurrences of atrial fibrillation (AF) after cryoballoon (CB) ablation. We aimed to characterize the extension of the lesions produced by CB ablation and to assess the value of using an ultra-high resolution electroanatomic mapping (UHDM) system to detect incomplete CB lesions. Twenty-nine consecutive patients from the CHARISMA registry undergoing AF ablation at four Italian centers were prospectively evaluated. The Rhythmia™ mapping system and the Orion™ (Boston Scientific) mapping catheter were used to systematically map the left atrium and PVs before and after cryoablation. A total of 116 PVs were targeted and isolated. Quantitative assessment of the lesions revealed a significant reduction of the antral surface area of the PV, resulting in an ablated area of 5.7 ± 0.7 cm2 and 5.1 ± 0.8 cm2 for the left PV pair and right PV pair, respectively (p = 0.0068). The mean posterior wall (PW) area was 22.9 ± 2 cm2 and, following PV isolation, 44.8 ± 6% of the PW area was ablated. After CB ablation, complete isolation of each PV was documented by the POLARMap™ catheter in all patients. By contrast, confirmatory UHDM and the Lumipoint™ tool unveiled PV signals in 1 out of 114 of the PVs (0.9%). Over 30-day follow-up, no major procedure-related adverse events were reported. After a mean follow-up of 333 days, 89.7% of patients were free from arrhythmia recurrence. The lesion extension achieved by the new CB ablation system involved the PV antrum, with less than 50% of the PW remaining untouched. The new system, with short tip and circular mapping catheter, failed to achieve PV isolation in only 0.9% of all PVs treated. [http://clinicaltrials.gov/], identifier [NCT03793998].

Research on the Evolution Law Physical Short Fatigue Crack and Tip Deformation Fields during Crack Closure Process of the Q&P Steel.

In this paper, a novel dual microscopic fatigue-crack and tip-deformation-fields measurement method based on a hybrid image-processing technique is proposed that was used to research the physical short fatigue crack (SFC) closure effect and the evolution law of the tip deformation fields of Quenching–Partitioning (Q&P) steel during the crack-closure process. The measurement problems are solved, such as the small SFC tip region, large deformation gradient, and strong material anisotropy. Microscopic crack and speckle images are acquired simultaneously on both sides of a compact tensile (CT) specimen of Q&P steel by dual microscopic cameras. A digital image processing (DIP) method is used to identify crack-growth morphology and measure crack length in Q&P steel, and the SFC growth rates are analyzed under different stress ratios. Microscopic digital image correlation (Micro-DIC) is used to analyze displacement fields at the crack tip of SFC and, combined with virtual extensometer technology, analyze the evolution law of crack closure and the evolution of crack-growing morphologies during the closure process under different lengths and stress ratios. Accordingly, the evolution of strain fields at the crack tip in one load cycle for different crack lengths and stress ratios during the SFC closure process is analyzed. The results show that the stress ratio affects the crack-closure behavior and crack growth rate of Q&P steel in the physical SFC crack-growing stage. The crack-closure effect has an obvious influence on the evolution process of displacement and strain fields at the crack tip. The evolution of short-fatigue-crack-tip morphology and strain field of Q&P steel conforms to the crack-closure law. The research results provide experimental and theoretical support for the further study of the SFC growth mechanism and fatigue life prediction of Q&P steel.

Kegiatan Pelatihan Tahsin Tilawah Al-Quran Dalam Meningkatkan Kemampuan Membaca Alquran Bagi Anggota Aisyiyah Pasar 4 Bandar Khalipah

The implementation of the Qur'an Tahsin training is aimed at members of Aisyiyah Pasar 4 Bandar Khalifah who are currently not fluent in reading the Qur'an properly and correctly, even though they are adults. However, it is never too late to learn. This Al-Qur'an tahsin training activity aims to be able to improve understanding in reading the Qur'an and understand the methods in reading the Qur'an properly and correctly. The method provided is in the form of short material and tips for reading with the rules of recitation. Furthermore, significant results have been obtained for Aisyiyah members in understanding and practicing the reading of the Qur'an. This shows that basically, the level of success of this training is achieved if it is learned and practiced as well as directly, so it takes consistency in reading the Qur'an on a daily basis which aims to maintain the rules of recitation and pronunciation so that they are better and of higher quality