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Continuous flow pyrolysis of virgin and waste polyolefins:a comparative study,process optimization and product characterization

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Frontiers of Chemical Science and Engineering 2024年第6期18卷 133-149页

作者： ecrin ekici Güray Yildiz Magdalena Joka Yildiz Monika Kalinowska ErolŞeker Jiawei Wang Karlsruhe Institute of Technology Institute of Catalysis Research and TechnologyEggenstein-Leopoldshafen 76344Germany Izmir Institute of Technology Faculty of EngineeringDepartment of Energy Systems EngineeringIzmir 35430Türkiye Department of Materials Engineering and Production Faculty of Mechanical EngineeringBialystok University of TechnologyBialystok 15-351Poland Department of Agricultural and Food Engineering and Environmental Development Institute of Civil Engineering and EnergeticsFaculty of Civil Engineering and Environmental SciencesBialystok University of Technology15-351 BialystokPoland Department of Chemistry Biology and BiotechnologyInstitute of Civil Engineering and EnergeticsFaculty of Civil Engineering and Environmental SciencesBialystok University of TechnologyBialystok 15-351Poland Izmir Institute of Technology Faculty of EngineeringDepartment of Chemical EngineeringIzmir 35430Türkiye Energy and Bioproducts Research Institute(EBRI) Aston UniversityBirmingham B47ETUnited Kingdom

Under optimal process conditions,pyrolysis of polyolefins can yield ca.90 wt%of liquid product,i.e.,combination of light oil fraction and heavier *** this work,the experimental findings reported in a selected group of publications concerning the non-catalytic pyrolysis of polyolefins were collected,reviewed,and compared with the ones obtained in a continuously operated bench-scale pyrolysis *** process parameters were used for the pyrolysis of waste and virgin counterparts of high-density polyethylene,low-density polyethylene,polypropylene and a defined mixture of those(i.e.,25:25:50 wt%,respectively).To mitigate temperature drops and enhance heat transfer,an increased feed intake is employed to create a hot melt plastic *** 1.5 g·min^(-1) feed intake,1.1 L·min^(-1) nitrogen flow rate,and a moderate pyrolysis temperature of 450℃,the formation of light hydrocarbons was favored,while wax formation was limited for polypropylene-rich *** of virgin plastics yielded more liquid(maximum 73.3 wt%)than that of waste plastics(maximum 66 wt%).Blending polyethylenes with polypropylene favored the production of liquids and increased the formation of gasoline-range *** products were mainly composed of C3 hydrocarbons,and no hydrogen production was detected due to moderate pyrolysis temperature.

关键词： waste plastics polyolefins chemical recycling pyrolysis alternative fuels waste-to-energy

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Investigation of risk factors in the development of recurrent urethral stricture after internal urethrotomy

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World Journal of Clinical Cases 2024年第14期12卷 2324-2331页

作者： Abdullah Gul Ozgur ekici Salim Zengin Deniz Barali Tarik Keskin Department of Urology University of Health SciencesBursa Yüksekİhtisas Education and Research HospitalBursa 16100Türkiye Department of Urology University of Health SciencesBursa City HospitalBursa 16000Türkiye

BACKGROUND Urethral stricture is a condition that often develops with trauma and results in narrowing of the urethral *** endoscopic methods are mostly used in its treatment,it has high recurrence ***,open urethroplasty is recommended after unsuccessful endoscopic *** To investigate the risk factors associated with urethral stricture *** The data of male patients who underwent internal urethrotomy for urethral stricture between January 2017 and January 2023 were retrospectively *** data,comorbidities,preoperative haemogram,and biochemical values obtained from peripheral blood and operative data were *** were divided into two groups in terms of recurrence development;recurrence and *** recorded data were compared between the two *** A total of 303 patients were included in the *** mean age of the patients was 66.6±13.6 *** mean duration of recurrence development was 9.63±9.84(min-max:1-39)months in the recurrence *** did not occur in non-recurrence group throughout the follow-up period with an average time of 44.15±24.07(min-max:12-84)*** the comparison of both groups,the presence of diabetes mellitus(DM),hypertension(HT),and multiple comorbidi-ties were significantly higher in the recurrence(+)group(P=0.038,P=0.012,P=0.013).Blood group,postoperative use of non-steroidal anti-inflammatory drugs,preoperative cystostomy,cause of stricture,iatrogenic cause of stricture,location and length of stricture,indwelling urinary cathater size and day of catheter removal did not differ between the two *** statistically significant difference was observed between the two groups in terms of age,uroflowmetric maximum flow rate value,hemo-gram parameters,aspartate aminotransferase(AST),alanine aminotransferase(ALT),fasting blood sugar,creati-nine,glomerular filtration rate,neutrophil-lymphocyte ratio,platelet-lymphocyte ratio,lymphocyte-

关键词： Inflammation Internal urethrotomy Recurrence Urethral stricture Urethra

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Advanced exergy analysis of the turbojet engine main components considering mexogenous, endogenous, exegenous, avoidable and unavoidable exergy destructions

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Propulsion and Power Research 2022年第3期11卷 391-400页

作者： Hakan Caliskan Selcuk ekici Yasin Sohret Department of Mechanical Engineering Faculty of EngineeringUsak UniversityUsak64200Turkey Department of Aviation Igdir UniversityIgdir76000Turkey Department of Airframe and Powerplant Maintenance School of Civil AviationSuleyman Demirel UniversityIsparta32700Turkey

In this study, exergy dynamic and advanced exergy analyses are applied to theturbojet engine to assess its mexogenous, endogenous, exogenous, avoidable and unavoidableexergies under the environment conditions of 15 C temperature and 1 bar pressure. Themaximum exergy point in the turbojet engine is found for the combustor in which C11H23(Jet-A1) fuel is combusted with air, while the minimum one is determined for the aircompressor head where the free air enters. The combustion chamber has the maximum fuel,product and irreversibility rates and the air compressor has the minimum fuel and product ex-ergy values, while the minimum irreversibility is found for the turbine. Maximum improvementpotential rate is found for the combustion chamber (5141.27 kW), while minimum rate is deter-mined for the turbine of system (6.95 kW). Also, the turbine component has the highest exergyefficiency (97.20%) due to its expansion process, while combustion chamber component hasthe lowest exergy efficiency (55.39%) due to low efficient combustion process of the ***, the mexogenous exergy destructions from maximum to minimum are found for the combustion chamber, air compressor and gas turbine units, respectively. Considering exergydynamic analysis, the mexogenous exergy destruction rates of the combustion chamber, aircompressor and gas turbine are found as 184.4 kW, 103.97 kW and 9.99 kW, *** all results, the combustion chamber is the primer component to be handled for bet-ter efficiency and improvement.

关键词： Advanced exergy Efficiency Gas turbine Jet fuel Mexogenous Turbojet Thermodynamic analysis Aircraft

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Psoriatic fasciitis in a pediatric patient: A case report

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World Journal of Clinical Cases 2019年第1期7卷 69-72页

作者： Gulcin Otar Yener Zahide ekici Tekin Selcuk Yuksel Department of Pediatric Rheumatology Pamukkale University School of Medicine

BACKGROUND Diffuse fasciitis with psoriatic arthritis on magnetic resonance imaging(MRI) has not been previously described in childhood. Here we present the first case report of a pediatric patient developing fasciitis, beyond plantar fasciitis, with psoriatic *** SUMMARY An 11-year-old female was admitted with the complaints of psoriatic rash on the body associated with severe pain in the lower extremities and arthritis in the right knee. Psoriasis was confirmed by skin biopsy, she diagnosed with juvenile psoriatic arthritis. Diagnostic tests did not indicate any pathology except *** of the femur and tibia revealed that high-signal inflammatory changes in the subdermal fascia. These findings led to a diagnosis of psoriatic *** was given for 3 mo but the patient showed no response to therapy;therefore, etanercept was added. However, there was no response to *** was switched to adalimumab at the sixth month of therapy. Clinical improvement started with therapy of adalimumab within one month. Fasciitis finding in MRI disappeared at seventh months on adalimumab therapy. She has no complaint for two years with *** The most effective imaging method is MRI and adalimumab may be the best choice of treatment for psoriatic fasciitis.

关键词： Case report Fasciitis Psoriasis Childhood Arthritis

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Bladder stone due to late clip migration after prostatic urethral lift procedure: A case report

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World Journal of Clinical Cases 2023年第30期11卷 7457-7462页

作者： Ali Seydi Bozkurt Ozgur ekici Ercüment Keskin Fatih Kocoglu Department of Urology Erzincan Binali Yıldırım University School of MedicineErzincan 24000Turkey

BACKGROUND Prostatic urethral lift(PUL)therapy is an alternative to minimally invasive and other surgeries in younger patients who want to preserve their sexual and ejaculatory functions,and in elderly male patients with benign prostatic hyperplasia who cannot be anesthetized because of the risk of *** procedure can be performed as an outpatient and without anesthesia,and complications are few and *** long-term follow-up,encrustations that require retreatment are rarely *** SUMMARY In our case,a 62-year-old prostate patient who had a PUL operation 8 years ago and had a stone on the PUL material near the bladder neck was *** patient’s stone was removed by endoscopic cystolithotripsy using pneumatic *** transurethral resection of the prostate was applied to the patient in the same *** the patient’s 7-year follow-up,the patient’s complaints relapsed,and cystoscopy was performed *** cystoscopy,stone formation adjacent to the wall was observed at the junction of the bladder neck to the left lateral *** stone was fragmented with a pneumatic *** Placing clips too close to bladder neck in the PUL procedure may result in clip migration.

关键词： Endoscopic cystolithotripsy Transurethral resection-P Urolift Bladder Stone Case report

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Determination of penetration depth at high velocity impact using finite element method and artificial neural network tools

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Defence Technology（防务技术） 2015年第2期11卷 110-122页

作者： Nam?k KILI? Blent ekici Selim HARTOMACIOG LU Computer Aided Engineering Department Otokar Otomotiv ve Savunma San.A.SAtaturk Cad No: 9 Arifiye54580SakaryaTurkey Department of Mechanical Engineering Faculty of EngineeringMarmara University Department of Mechanical Engineering Faculty of Mechanical EducationMarmara University

Determination of ballistic performance of an armor solution is a complicated task and evolved significantly with the application of finite element methods(FEM) in this research *** traditional armor design studies performed with FEM requires sophisticated procedures and intensive computational effort,therefore simpler and accurate numerical approaches are always worthwhile to decrease armor development *** study aims to apply a hybrid method using FEM simulation and artificial neural network(ANN) analysis to approximate ballistic limit thickness for armor *** achieve this objective,a predictive model based on the artificial neural networks is developed to determine ballistic resistance of high hardness armor steels against 7.62 mm armor piercing *** this methodology,the FEM simulations are used to create training cases for Multilayer Perceptron(MLP) three layer *** order to validate FE simulation methodology,ballistic shot tests on 20 mm thickness target were performed according to standard Stanag ***,the successfully trained ANN(s) is used to predict the ballistic limit thickness of 500 HB high hardness steel *** show that even with limited number of data,FEM-ANN approach can be used to predict ballistic penetration depth with adequate accuracy.

关键词：人工神经网络有限元法穿透深度性能测定高速冲击有限元模拟 FEM模拟工具

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Iatrogenic bladder neck rupture due to traumatic urethral catheterization: A case report

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World Journal of Clinical Cases 2023年第30期11卷 7413-7417页

作者： Ozgur ekici Ercüment Keskin Fatih Kocoglu Ali Seydi Bozkurt Department of Urology Faculty of MedicineErzincan Binali Yıldırım UniversityErzincan 24000Turkey

BACKGROUND In this article,we present a case of iatrogenic bladder neck rupture due to catheter insertion in a 94-year-old comorbid male *** SUMMARY The patient,who had a urethral catheter inserted in the palliative service 3 d ago,was consulted because the catheter did not *** the fluid given to the bladder could not be recovered,computed tomography was performed,which revealed that the catheter had passed the bladder neck first into the retrovesical area then into the intraabdominal *** appearance of the anterior urethra and verumontanum was normal at ***,extremely severe stenosis of the bladder neck,and perforated posterior wall of the urethral segment between the prostatic urethra and the bladder neck were *** urethrotomy was applied to the bladder neck with a *** urethral catheter was sent over the guide wire into the *** patient was followed in the palliative care service and the catheter was removed 7 d *** extravasation was observed in the control *** Although catheter insertion is a simple and frequently performed procedure in hospitalized patients,it is necessary to avoid unnecessary extra-indication catheter insertion.

关键词： Bladder neck rupture Uretrhral catheterization Iatrogenic Extravasation False route Case report

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Arterial complication of irreversible electroporation procedure for locally advanced pancreatic cancer

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World Journal of Gastrointestinal Oncology 2016年第10期8卷 751-756页

作者： Yahya ekici Tugan Tezcaner Hüseyin Onur Aydin Fatih Boyvat G?khan Moray Department of General Surgery Medical Faculty of Baskent University Department of Radiology Medical Faculty of Baskent University

Irreversible electroporation(IRE) is a non-thermal ablation technique used especially in locally advanced pancreatic carcinomas that are considered surgically *** present the first case of acute superior mesenteric artery(SMA) occlusion secondary to pancreatic IRE procedure that has not been reported before in the literature.A 66-year-old man underwent neoadjuvant chemoradiotherapy for locally advanced pancreatic ductal *** procedure was applied to the patient during laparotomy under general *** finishing the procedure,an acute intestinal ischemia was detected.A conventional vascular angiography was performed and a metallic stent was successfully placed to the SMA and blood flow was *** is important to be careful in such cases of tumor involvement of SMA when evaluating for IRE procedure of pancreatic tumor.

关键词： Irreversible electroporation Mesenteric artery occlusion Locally advanced pancreatic cancer Superior mesenteric artery

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Boldine provides protective effect against nephrotoxicity induced by cisplatin in Wistar rats:Role of oxidative stress,inflammation and caspase-3

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BIOCELL 2022年第9期46卷 2111-2122页

作者： NERGIZ HACER TURGUT HUSEYIN GUNGOR MEHMET ekici MUMIN ALPER ERDOGAN MEHMET ONDER KARAYIGIT HAKI KARA Department of Pharmacology Faculty of PharmacyIzmir Katip Celebi UniversityIzmir35620Turkey Department of Pharmacology and Toxicology Faculty of Veterinary MedicineCumhuriyet UniversitySivas58140Turkey Department of Physiology Faculty of Veterinary MedicineCumhuriyet UniversitySivas58140Turkey Department of Physiology Faculty of MedicineIzmir Katip Celebi UniversityIzmir35620Turkey Department of Pathology Faculty of Veterinary MedicineCumhuriyet UniversitySivas58140Turkey

Side effects of cisplatin,especially dose-dependent nephrotoxicity,are major factors limiting its use in ***((S)-2,9-dihydroxy-1,10-dimethoxy-aporphine)is a natural alkaloid known for its strong antioxidant activity present in leaves/bark of boldo tree(Peumus boldus Molina),a native tree in ***,we aimed to investigate the nephroprotective effect of boldine and its underlying mechanisms on cisplatin-induced rat renal *** Wistar albino rats divided into 5 groups(Control,Cis,Bold.40,Cis+Bold.20,Cis+Bold.40 groups)were *** received boldine(20 or 40 mg/kg/day),or vehicle(saline)intraperitoneal for 14 days and a single dose cisplatin(7 mg/kg,ip)was applied on the 10th day to induce *** and kidney tissue were weighed to determine kidney *** urea nitrojen(BUN)and creatinine levels,the amount of thiobarbituric acid reactive substances(TBARS,an index of lipid peroxidation),superoxide dismutase(SOD),glutathione peroxidase(GPx)enzyme activities and tumor necrosis factor alpha(TNF-α)levels were measured and histopathologic examination was *** nitric oxide synthase(iNOS)and caspase-3 expressions were detected *** induced by cisplatin was apparent by elevated levels of BUN,creatinine,kidney index,TBARS and TNF-α,and decreased body weight,SOD and GPx enzyme *** with boldine protected the renal function at both boldine doses by fixing the renal damage markers,oxidative stress,caspase-3 and iNOS *** findings supported biochemical *** together these findings indicate that boldine has promising protective effect against cisplatin nephrotoxicity by improving oxidative stress,inflammation,histopathological alterations and by alleviating caspase 3 expression.

关键词： Boldine Caspase-3 Cisplatin nephrotoxicity Inflammation Oxidative stress

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Emergency cholecystectomy vs percutaneous cholecystostomy plus delayed cholecystectomy for patients with acute cholecystitis

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Hepatobiliary & Pancreatic Diseases International 2014年第3期13卷 316-322页

作者： Feza Y Karakayali Aydincan Akdur Mahir Kirnap Ali Harman Yahya ekici G?han Moray Department of General Surgery Baskent University School of Medicine Department of Radiology Baskent University School of Medicine

BACKGROUND: In low-risk patients with acute cholecystitis who did not respond to nonoperative treatment, we prospectively compared treatment with emergency laparoscopic cholecystectomy or percutaneous transhepatic cholecystostomy followed by delayed ***: In 91 patients(American Society of Anesthesiologists class I or II) who had symptoms of acute cholecystitis ≥72 hours at hospital admission and who did not respond to nonoperative treatment(48 hours), 48 patients were treated with emergency laparoscopic cholecystectomy and 43 patients were treated with delayed cholecystectomy at ≥4 weeks after insertion of a percutaneous transhepatic cholecystostomy catheter. After initial treatment, the patients were followed up for 23 months on average(range 7-29).RESULT: Compared with the patients who had emergency laparoscopic cholecystectomy, the patients who were treated with percutaneous transhepatic cholecystostomy and delayed cholecystectomy had a lower frequency of conversion to open surgery [19(40%) vs 8(19%); P=0.029], a frequency of intraoperative bleeding ≥100 mL [16(33%) vs 4(9%); P=0.006],a mean postoperative hospital stay(5.3±3.3 vs 3.0±2.4 days;P=0.001), and a frequency of complications [17(35%) vs 4(9%);P=0.003].CONCLUSION: In patients with acute cholecystitis who presented to the hospital ≥72 hours after symptom onset and did not respond to nonoperative treatment for 48 hours, percutaneous transhepatic cholecystostomy with delayed laparoscopic cholecystectomy produced better outcomes and fewer complications than emergency laparoscopic cholecystectomy.

关键词： acute abdomen acute cholecystitis complications laparoscopy surgery biliary tract

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