25 research outputs found
Anomalous Rotational Relaxation: A Fractional Fokker-Planck Equation Approach
In this study we obtained analytically relaxation function in terms of
rotational correlation functions based on Brownian motion for complex
disordered systems in a stochastic framework. We found out that rotational
relaxation function has a fractional form for complex disordered systems, which
indicates relaxation has non-exponential character obeys to
Kohlrausch-William-Watts law, following the Mittag-Leffler decay.Comment: Revtex4, 9 pages. Paper was revised. References adde
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Energetic contributions to deformation twinning in magnesium
Modeling deformation twin nucleation in magnesium has proven to be a challenging task. In particular, the absence of a heterogeneous twin nucleation model which provides accurate energetic descriptions for twin-related structures indicates a need to more deeply understand twin energetics. To address this problem, molecular dynamics simulations are performed to follow the energetic evolution of { 10 1 ‾ 2 } tension twin embryos nucleating from an asymmetrically-tilted grain boundary. The line, surface and volumetric terms associated with twin nucleation are identified. A micromechanical model is proposed where the stress field around the twin nucleus is estimated using the Eshelby formalism, and the contributions of the various twin-related structures to the total energy of the twin are evaluated. The reduction in the grain boundary energy arising from the change in character of the prior grain boundary is found to be able to offset the energy costs of creating the other interfaces. The defect structures bounding the stacking faults that form inside the twin are also found to possibly have significant energetic contributions. These results suggest that both of these effects could be critical considerations when predicting twin nucleation sites in magnesium
Tekstil endüstrisinde bütünleşik membran sistemi ile su geri kazanımı ve hibrit ileri oksidasyon/membran filtrasyonu ile konsantrelerin arıtımı ve yönetimi
Bu
çalışmada, etkinliği bilinen UF/NFsıkı/TO membran kombinasyonu ile tekstil
atıksularının arıtımının yanısıra %75-80 su geri kazanım oranı dahilinde oluşan
membran konsantrelerinin, bütünleşik ileri oksidasyon prosesi (Fenton ve
foto-Fenton (UVA-365–UVC-254))/batık UF sistemi ile daha önce belirlenen
optimum işletme şartlarında oksidasyona tabi tutularak yönetimi
gerçekleştirilmiştir. Yapılan deneysel çalışmalar sonucunda, UF/NFsıkı/TO
membran konfigürasyonu ile arıtımı sonucunda oluşan konsantre akımlarının
Fenton, foto-Fenton (UVA-365) ve (UVC-254) prosesleri/batık UF sistemi ile
oksidasyonu sonrası, ardışık işletimli foto-Fenton
(UVC-254)/UH050 hibrit prosesinin 9.88 H2O2/TOK ve 7.27 H2O2/Fe2+
oranlarında, 44 L/m2.sa’lik süzüntü akısında %86 KOİ giderimi ile
KOİ değeri 167 mg/L’ye ve %74.2 TOK giderimi ile TOK değeri 104 mg/L’ye kadar
düşürülerek en iyi performans gösteren yenilikçi proses olduğu sonucuna
varılmıştır. Oluşan membran konsantrelerin oksidasyonu sonrasında kalan
konsantrenin tehlikelilik özellikleri, bertaraf/geri kazanım yöntemleri ve
yeniden kullanım alternatifleri değerlendirildiğinde tekstil endüstrisi
atıksularının foto-Fenton
(UVA-365) ile arıtımı sonucunda oluşan konsantre haricinde diğer tüm
konsantrelerin tehlikeli özelliğine sahip olduğu görülmüştür. Konsantrelerin
bertaraf/geri kazanım yöntemleri ayrıntılı olarak değerlendirildiğinde, gerekli
düzenlemeler (nem içeriği, susuzlaştırma, uygun debi ve/veya karışım oranları)
yapıldığı takdirde bu konsantrelerin düzenli depolama, yakma ve merkezi atıksu
arıtma sistemine verme gibi seçeneklerle bertaraf edilebileceği sonucuna
varılmıştır
Favorable outcome with sentinel lymph node biopsy alone after neoadjuvant chemotherapy in clinically node positive breast cancer at diagnosis: Turkish Multicentric NEOSENTI-TURK MF-18-02-study.
Purpose: Factors affecting local outcome were evaluated in patients with clinically node-positive (cN+) breast cancer at diagnosis, who underwent sentinel lymph node biopsy (SLNB) alone after neoadjuvant chemotherapy (NAC). Methods: Between 2004 and 2018, 303 cytopathology-proven cN (+) patients in a multicentric registry, who received NAC and underwent SLNB alone were analysed. All patients had regional nodal irradiation. Results: Median age was 46 (23-70). Of those, 211 patients had ypN0 disease (69.6%), whereas 92 pa-tients had ypN (+) disease including 19 (20.6%) isolated tumor cells (ITC), 33 micrometastases (35.9%) and 40 macrometastases (43.5%). At a median follow-up of 36 months (24-172), one patient (0.3%) with macrometastatic SLN was found to have locoregional recurrence as chest wall and supraclavicular LN metastases at the 60th month. Five-year disease-free survival (DFS) and disease specific survival (DSS) rates were 87% and 95%, respectively. Patients with cT3/4 (HR = 2.41, 95% CI; 1.14-5.07), non-luminal molecular pathology (HR = 2.60, 95% CI, 1.16-5.82), and non-pCR in the breast (HR = 2.11, 95% CI, 0.89-5.01) were found to have an increased HR compared to others in 5-year DFS. However, no dif-ference could be found between ypN0 and ypN ITC and micrometastasis (HR = 1.23, 95% CI, 0.44-3.47), whereas there was a slight increase in HR of patients with ypN macrometastasis versus ypN0 (HR = 1.91, 95% CI, 0.63-5.79). Conclusion: ALND could be avoided in meticulously selected cN (+) patients who underwent SLNB after NAC having breast and/or nodal pCR, cT1-2, or low volume residual nodal disease with luminal pa-thology, as long as axillary radiotherapy is provided. (c) 2021 Published by Elsevier Ltd