检索结果-南通市图书馆

Applied Mathematics(A Journal of Chinese Universities) 2024年第4期39卷 642-653页

作者： Orkun Tasbozan ercan Celik Ali Kurt Lanre Akinyemi Department of Mathematics Faculty of Science and ArtHatay Mustafa Kemal UniversityHatayTurkey Department of Mathematics Faculty of ScienceAtaturk UniversityErzurumTurkey Department of Applied Mathematics and informatics Kyrgyz-Turkish Manas UniversityBishkekKyrgyzstan Department of Mathematics Faculty of SciencePamukkale UniversityDenizliTurkey Department of Mathematics Lafayette CollegeEastonPennsylvaniaUSA

The main objective of this study is to find novel wave solutions for the time-fractional generalized Rosenau-Kawahara-RLW equation, which occurs in unidirectional water wave propagation. The generalized Rosenau-Kawahara-RLW equation comprises three equations Rosenau equation, Kawahara equation, RLW equation and also p-th order nonlinear term. All these equations describe the wave phenomena especially the wave-wave and wave-wall interactions in shallow and narrow channel waters. The auxiliary equation method is employed to get the analytical results.

关键词： time-fractional generalized Rosenau-Kawahara-RLWequation conformable fractional derivative auxiliary equation method shallow water

Effects of thinning on stand structure and tree stability in an afforested oriental beech(Fagus orientalis Lipsky) stand in northeast Turkey

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2015年第1期26卷 123-129页

作者： Zafer Yücesan Sevilay ?z?elik ercan Oktan Faculty of Forestry Karadeniz Technical University General Directorate of Combating to Desertification and Erosion Control

We studied relationships between stand structure and stand stability according to thinning intensity in an afforested oriental beech stand. Various thinning intensities were applied in sample stands. We sampled eight plots in stands that were lightly thinned, eight plots in heavily thinned stands and eight plots in unthinned stands as a control. Height and diameter distributions of the stands were measured to assess stand structure. We quantified individual tree stability and collective stability. Heavy thinning during the first thinning operation damaged the storied structure of the stand in thicket stage and affected collective structuring ability. While most control plots had multi-storied stands, after light and heavy thinning two-storied structure became more *** gaps occurred in the canopy after heavy thinning. On average, nine tree collectives were formed per sampling plot in the untreated stand, seven collectives after thinning in 2008 and four collectives after thinning in 2009. Stable trees accounted for 17 % of trees in control plots, 24 % in lightly thinned plots, and 15 % in heavily thinned plots. Collective stability values were 83 % in control plots, 82 % in lightly thinned plots and 36 % in heavily thinned plots. We conclude that it is necessary to retain collective structuring capacity during thinning operations for sustaining stand stability.

关键词： Oriental beech Thinning Stand structure Tree stability

Mechanical Properties of Reactive Powder Concretes Produced Using Pumice Powder

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2019年第2期34卷 353-360页

作者： Abdurrezzak BAKiS ercan iSiK Alev Ak?ll? EL Mustafa üLKER Bitlis Eren University Faculty of Engineering and Architecture Department of Civil Engineering Bitlis Eren University Vocational School of Technical Sciences

We examined the applicability of the pumice aggregate on the concrete formed by considering the reactive powder concrete mixture ratios, for the rigid superstructure concrete road pavement and building construction. The natural pumice aggregate in fibrous and non-fibrous concrete samples was used in the production of concrete by fracturing in 0.1-0.6 mm dimensions in rotor mill. The concreted formed in this way is named after the pumice powder concrete(PPC). The PPC samples produced were taken 7 days as 20 ℃ standard water cure, 28 days as 20 ℃ standard cure and 9 different types of combined cures. The combined cures were applied different temperatures in different durations. PPC samples were subjected to some pressure and flexural tests at the end of the standard water and combined cures. The highest compressive and flexural strengths of PPC samples were obtained after the combined cures: 3 days in 20 ℃ as standard water curing + 2 days in 180 ℃ in drying-oven. The highest compressive strength of PPC samples without any fiber was found to be 47.27 MPa, as for the highest flexural strength, it is found to be 5.23 MPa, in the end of the study. The highest compressive strength of fibrous PPC samples was 51.12 MPa, while flexural strength was 6.57 MPa.

关键词： reactive powder concrete (RPC) pumice powder concrete (PPC) combined cure compressive strength flexural strength

A rare complication of a malleable penile prosthesis： migration to the thigh region

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2013年第6期15卷 852-853页

作者： ercan Ogreden Bayram Güner Erdal Benli Department of Urology Giresun Ada Hospital Giresun 28100 Turkey Department of Urology Ordu University Ordu 52000 Turkey

Dear editor, Here, we discuss an unusual prosthesis migration to the thigh region. Because the incidence of erectile dysfunction increases in par-allel with the prevalence of neurological, degenerative and vascular diseases among elderly men, the use of penile prostheses is common in this age group. Still, cylinder migration following the implantation of a malleable penile prosthesis is a very rare entity.

关键词：

Comparative study on corrosion behaviors of Mg-Al-Zn alloys

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2018年第4期28卷 642-650页

作者： Sennur CANDAN ercan CANDAN Department of Mechanical and Manufacturing Engineering Bilecik Seyh Edebali University

A comparative study on corrosion behaviors of various Mg-Al-Zn alloys(AZ21,AZ41,AZ61 and AZ91 series,cast under same cooling conditions and controlled alloying composition)was carried *** electron microscopy(SEM)and X-ray diffraction(XRD)were used for microstructural *** corrosion behaviors were evaluated by immersion tests and potentiodynamic polarization measurements in 3.5%NaCl *** results showed that the influence of Al addition on corrosion resistance was more pronounced up to 4%(***41)above which its influence was at less *** deterioration of the corrosion resistance of the alloys,at higher Al contents,was attributed to the amount and morphology ofβ-Mg17Al12 intermetallics and the interruption of continuity of the oxide film on the surface of the alloys owing to coarsenedβintermetallics.

关键词： Mg alloy AZ series alloys casting corrosion

Prognostic impact of inflammatory and nutritional biomarkers in pancreatic cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Oncology 2025年第1期16卷 5-9页

作者： Macarena Teja María i Garrido Abrahams Ocanto Felipe Counago Department of Radiation Oncology GenesisCare-San Francisco de Asís University HospitalMadrid 28002Spain Department of Radiation Oncology GenesisCare-Vithas La Milagrosa University HospitalMadrid 28010Spain National Director GenesisCare SpainMadrid 28043Spain Department of Medicine School of MedicineHealth and SportEuropean University of MadridMadrid 28670Spain

Pancreatic cancer is usually associated with a poor *** is the main curative treatment but pancreatic operations are aggressive and new tools that help clinicians to predict surgical and prognostic outcomes are *** et al recently published a retrospective,single centre cohort study evaluating the impact of seven nutritional and inflammatory markers in pancreatic cancer surgical patients:The albumin-to-globulin ratio,prognostic nutritional index(PNi),systemic immune-inflammation index(Sii),neutrophil-to-lymphocyte ratio(NLR),platelet-to-lymphocyte ratio(PLR),nutritional risk index,and the geriatric nutritional risk index.A significant correlation was found between the PNi,Sii,NLR,and PLR and a hospital discharge of less than 15 *** a univariable analysis,PNi,Sii,NLR and PLR were significantly related to recurrence-free survival and,in a multivariable analysis PNi was associated with overall *** meta-analyses corroborate the results in terms of prognosis but individual studies are discordant on their ***,the cut-off values for these markers vary significantly between studies and there are no clinical trials comparing them to identify the most relevant *** are limitations when implementing nutritional and inflammatory biomarkers into clinical practice and further studies are needed in order to answer these questions.

关键词： inflammatory biomarkers Nutritional biomarkers Pancreatic cancer Prognosis Surgical complications

A comparative study on corrosion of Mg-Al-Si alloys

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2017年第8期27卷 1725-1734页

作者： Sennur CANDAN ercan CANDAN Department of Mechanical and Manufacturing Engineering Bilecik Seyh Edebali University Bilecik 11210 Turkey Department of Mechanical Engineering Avrasya University Trabzon 61200 Turkey

Corrosion behavior of various Mg-Al-Si alloys(AS11,AS21,AS41,AS61and AS91series),cast under the same coolingconditions and controlled alloying composition,was investigated *** microscopy and scanning electronmicroscopy were used for microstructural *** corrosion behavior was evaluated by immersion tests andpotentiodynamic polarization measurements in3.5%NaCl *** results from both immersion tests and the potentiodynamicpolarization measurements showed that marginal improvement in corrosion resistance was observed with2.0%Al(mass fraction)containing alloy(AS21)whereas Al addition above2.0%(AS41,AS61and AS91)deteriorated the corrosion resistance which wasattributed toβphase,acting as cathode,and the interruption of continuity of the oxide film on the surface of the alloys owing tocoarsenedβand Mg2Si phases.

关键词： Mg alloy AS series alloys microstructure corrosion

Cognitive attentional syndrome and metacognitive beliefs as potential treatment targets for metacognitive therapy in bipolar disorder

在线全文

学校读者我要写书评

暂无评论

World Journal of Psychiatry 2021年第9期11卷 589-604页

作者： Sedat Batmaz Ali.ercan Altinoz Harun Olcay Sonkurt Department of Psychiatry School of MedicineTokat Gaziosmanpasa UniversityTokat 60100Turkey Department of Psychiatry School of MedicineEskisehir Osmangazi UniversityEskisehir 26000Turkey Psychiatry Clinic Agri Training and Research HospitalAgri 04000Turkey

Most treatment guidelines emphasize the use of psychotropic drugs for both the acute and maintenance treatment of bipolar disorder(BD).However,relying only on psychotropics without adjunctive psychosocial interventions may be insufficient in treating patients with *** its unique view in the explanation of psychopathological states,metacognitive therapy(MCT)might be helpful for *** theory posits that psychopathology is a result of the cognitive attentional syndrome(CAS)and that it is influenced and maintained by dysfunctional metacognitive beliefs,perseverative thinking,attentional biases,and dysfunctional coping *** this review,literature data regarding these areas in BD are *** suggest that perseverative thinking might be among the emotion regulation strategies endorsed in individuals with *** attentional biases,literature data show that state-dependent,moodchanging attentional biases and a ruminative self-focused attention are *** also suggest that cognitive self-consciousness is higher in BD compared to *** is seen that maladaptive coping strategies are frequently reported in BD,and that these strategies are associated with depression severity,negative affect and relapse *** focusing on dysfunctional metacognitive beliefs in BD reported that individuals with BD had higher scores for negative metacognitive beliefs,self-consciousness,need to control thoughts,and a lack of cognitive ***,dysfunctional metacognitive beliefs were associated with depressive *** findings suggest that the components of CAS and dysfunctional metacognitive beliefs are evident in *** a subgroup of patients with BD who fail to respond to evidence-based psychopharmacological and adjunctive psychotherapeutic interventions,MCT might be an alternative way to consider as a treatment *** conclusion,taken the available data together,we propose a sequential treatment protocol for BD,ma

关键词： Attentional biases Bipolar disorder Dysfunctional coping Metacognition Metacognitive therapy Perseverative thinking Threat monitoring

Ultrasound biomicroscopic evaluation of anterior segment cysts as a risk factor for ocular hypertension and closure angle glaucoma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

international Journal of Ophthalmology(English edition) 2013年第4期6卷 515-520页

作者： Abdurrahim Dusak Mehmet Baykara Guven Ozkaya Cuneyt Erdogan Hikmet Ozcetin ercan Tuncel Department of Radiology School of MedicineUludag University Department of Ophthalmology School of MedicineUludag University Department of Statistics School of MedicineUludag University

AiMTo investigate the relationship between the ultrasound biomicroscopic (UBM) features of anterior-segment cysts (ASCs) and increased intraocular pressure (iOP) as a risk factor for closed-angle glaucoma (CAG).

关键词： anterior-segment cyst ocular hypertension closed-angle glaucoma intraocular pressure ultrasound biomicroscopy

The effect of perirenal fat stranding on infectious complications after ureterorenoscopy in patients with ureteral calculi

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Urology 2022年第3期9卷 307-312页

作者： Erhan Demirelli.ercan Ogreden Cemil Bayraktar Alptekin Tosun Ural Oguz Giresun University Faculty of MedicineDepartment of UrologyGiresunTurkey Ministry of Health Kayseri City HospitalDepartment of UrologyKayseriTurkey Giresun University Faculty of MedicineDepartment of RadiologyGiresunTurkey

Objective:Perirenal fat stranding(PFS)is linear areas of soft-tissue attenuation in the perirenal space on non-contrast computed *** present study aimed to investigate whether PFS is associated with infectious complications after ureterorenoscopy(URS)in patients with ureteral calculi in any ***:The data of 602 patients with ureteral stones who underwent URS were analyzed *** patients were divided into two groups as Group 1(PFS not detected)and Group 2(PFS detected).Gender,and age of patients,size,side,and location of the stone,operation time,double-J stent insertion status,perioperative ureter injury,postoperative infection after URS and related complications,and duration of hospital stay were ***:While PFS was not detected in 530 patients,PFS was detected in 72 *** mean age,male/female ratio,side and localization of the stones,operation time,and perioperative insertion of the double-J after lithotripsy were statistically similar(p>0.05).The median stone diameter was smaller in Group 2(9 mm vs.8 mm)(p=0.033).Fever was observed in 30 and 38 patients in Group 1 and Group 2,respectively(p=0.0001).Urinary tract infection was detected in 24 and 27 patients in Group 1 and Group 2,respectively(p=0.0001).The urosepsis did not occur in any patients in Group 1,whereas 8(11.1%)patients in Group 2 experienced urosepsis(p=0.0001).Conclusion:According to the results of the present study,patients with ureteral stones accompanied by PFS are much more prone to ureteral injuries and infectious complications such as urinary tract infection,fever,and sepsis after URS.

关键词： Perirenal fat stranding infective complications Ureterorenoscopy Ureteral stones Double-J stent