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Performance of Continuous Wavelet Transform over Fourier Transform in Features Resolutions

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International Journal of Geosciences 2024年第2期15卷 87-105页

作者： michael K. Appiah Sylvester K. danuor Alfred K. Bienibuor department of Physics Kwame Nkrumah University of Science and Technology (KNUST) Kumasi Ghana department of Chemical Sciences University of Energy and Natural Resources Sunyani Ghana

This study presents a comparative analysis of two image enhancement techniques, Continuous Wavelet Transform (CWT) and Fast Fourier Transform (FFT), in the context of improving the clarity of high-quality 3d seismic data obtained from the Tano Basin in West Africa, Ghana. The research focuses on a comparative analysis of image clarity in seismic attribute analysis to facilitate the identification of reservoir features within the subsurface structures. The findings of the study indicate that CWT has a significant advantage over FFT in terms of image quality and identifying subsurface structures. The results demonstrate the superior performance of CWT in providing a better representation, making it more effective for seismic attribute analysis. The study highlights the importance of choosing the appropriate image enhancement technique based on the specific application needs and the broader context of the study. While CWT provides high-quality images and superior performance in identifying subsurface structures, the selection between these methods should be made judiciously, taking into account the objectives of the study and the characteristics of the signals being analyzed. The research provides valuable insights into the decision-making process for selecting image enhancement techniques in seismic data analysis, helping researchers and practitioners make informed choices that cater to the unique requirements of their studies. Ultimately, this study contributes to the advancement of the field of subsurface imaging and geological feature identification.

关键词： Continuous Wavelet Transform (CWT) Fast Fourier Transform (FFT) Reservoir Characterization Tano Basin Seismic data Spectral decomposition

Construction of a novel six-gene signature to predict tumour response to induction chemotherapy and overall survival in locoregionally advanced laryngeal and hypopharyngeal carcinoma

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Genes & diseases 2024年第3期11卷 148-150页

作者： Chen Tan Lingwa Wang Yifan Yang Shizhi He George G.Chen Jason YK.Chan michael CF.Tong C.A.van Hasselt Wenbin Xu Ling Feng Ru Wang Jugao Fang department of Otolaryngology Head and Neck Surgery Beijing Tongren HospitalCapital Medical UniversityBeijing 100730China Key Laboratory of Otolaryngology Head and Neck Surgery(Ministry of Education of China) Beijing Institute of OtolaryngologyBeijing 100730China department of Otorhinolaryngology Head and Neck SurgeryThe Chinese University of Hong KongPrince of Wales HospitalHongKong SAR999077China department of Medical Genetics Institute of Basic Medical ScienceChinese Academy of Medical Science&Peking Union Medical CollageBeijing 100730China

Locoregionally advanced laryngeal and hypopharyngeal cancers(LA-LHCs)are traditionally treated with surgery followed by postoperative radiotherapy,which impairs speech and swallowing functions and reduces the quality of life.^(1,2)The use of induction chemotherapy(IC)as a larynxpreserving approach for LA-LHCs has been verified and refined.^(3)However,the short-term tumor response to IC varies,non-responders usually show poor survival and little benefit.

关键词： chemotherapy laryngeal surgery

Macrophage inflammatory protein-2 contributes to liver resection-induced acceleration of hepatic metastatic tumor growth

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World Journal of Gastroenterology 2006年第6期12卷 858-867页

作者： OttoKollmar MartinKSchilling michael d Menger department of General VisceralVascular and Pediatric SurgeryUniversity of the Saarland D-66421 Homburg/SaarGermany Institute for Clinical and Experimental Surgery University of the Saarland D-66421 Homburg/SaarGermany

AIM： To study the role of macrophage inflammatory protein （HIP）-2 in liver resection-induced acceleration of tumor growth in a mouse model of hepatic metastasis. METHOdS： After a 50% hepatectomy, 1×10^5 *** cells were implanted into the left liver lobe of syngeneic balb/c mice （PHx）. Additional animals were treated with a monoclonal antibody （HAB452） neutralizing HIP-2 （PHx＋mAB）. Non-resected and non-mAB-treated mice （Con） served as controls. After 7 d, tumor angiogenesis and microcirculation as well as cell proliferation, tumor growth, and CXCR-2 expression were analyzed using in- travital fluorescence microscopy, histology, immunohisto- chemistry, and flow cytometry. RESULTS： Partial hepatectomy increased （P〈0.05）the expression of the HIP-2 receptor CXCR-2 on tumor cells when compared with non-resected controls, and markedly accelerated （P〈 0.05） angiogenesis and metastatic tumor growth. Neutralization of HIP-2 by HAB452 treatment significantly （P〈 0.05） depressed CXCR-2 expression. Further, the blockade of MIP-2 reduced the angiogenic response （P〈 0.05） and inhibited tumor growth （P〈 0.05）. Of interest, liver resection-induced hepatocyte proliferation was not effected by anti-HIP-2 treatment. CONCLUSION： HIP-2 significantly contributes to liver resection-induced acceleration of colorectal *** hepatic metastasis growth.

关键词： Chemokines MIP-2 Liver resection Partial hepatectomy Liver regeneration Metastatic tumor growth Angiogenesis Microcirculation

Human allograft rejection in humanized mice： a historica perspective

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Cellular & Molecular Immunology 2012年第3期9卷 225-231页

作者： michael A Brehm Leonard d Shultz Program in Molecular Medicine University of Massachusetts Medical School Worcester MA USA The Jackson Laboratory Bar Harbor M_E usA

Basic research in transplantation immunology has relied primarily on rodent models. Experimentation with rodents has laid the foundation for our basic understanding of the biological events that precipitate rejection of non-self or allogeneic tissue transplants and supported the development of novel strategies to specifically suppress allogeneic immune responses, However, translation of these studies to the clinic has met with limited success, emphasizing the need for new models that focus on human immune responses to allogeneic tissues. Humanized mouse models are an exciting alternative that permits investigation of the rejection of human tissues mediated by human immune cells without putting patients at risk. However, the use of humanized mice is complicated by a diversity of protocols and approaches, including the large number of immunodeficient mouse strains available, the choice of tissue to transplant and the specific human immune cell populations that can be engrafted. Here, we present a historical perspective on the study of allograft rejection in humanized mice and discuss the use of these novel model systems in transplant biology.

关键词： transplantation immunodeficient mice human

Variables separated equations:Strikingly different roles for the Branch Cycle Lemma and the finite simple group classification

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Science China Mathematics 2012年第1期55卷 1-72页

作者： FRIEd michael d. department of Mathematics University of California at Irvine

davenport's Problem asks:What can we expect of two polynomials,over Z,with the same ranges on almost all residue class fields? This stood out among many separated variable problems posed by davenport,Lewis and *** bounding the degrees,but expanding the maps and variables in davenport's Problem,Galois stratification enhanced the separated variable theme,solving an Ax and Kochen problem from their Artin Conjecture *** and Loeser applied this to add Chow motive coefficients to previously introduced zeta functions on a diophantine *** restricting the variables,but leaving the degrees unbounded,we found the striking distinction between davenport's problem over Q,solved by applying the Branch Cycle Lemma,and its generalization over any number field,solved by using the simple group *** encouraged Thompson to formulate the genus 0 problem on rational function monodromy *** and Thompson led its solution in *** look at two developments since the solution of davenport's *** from MacCluer's 1967 thesis,identifying a general class of problems,including davenport's,as monodromy precise.R(iemann)E(xistence)T(heorem)'s role as a converse to problems generalizing davenport's,and Schinzel's (on reducibility).We use these to consider:Going beyond the simple group classification to handle imprimitive groups,and what is the role of covers and correspondences in going from algebraic equations to zeta functions with Chow motive coefficients.

关键词： group representations normal varieties Galois stratification davenport pair Monodromy group primitive group covers fiber products Open Image Theorem Riemann's existence theorem genus zero problem

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2024最值得关注的七大技术

宁波经济（财经视点） 2024年第4期 32-34页

作者： michael Eisenstein 不详

从蛋白质工程到3d打印再到深度伪造(deepfake),《自然》近期细数了今年值得关注的七大技术。面向蛋白质设计的深度学习20年前,华盛顿大学的david Baker和同事取得了一个重要突破:他们用计算工具从头设计了一种全新的蛋白质。“Top7”能... 详细信息

从蛋白质工程到3d打印再到深度伪造(deepfake),《自然》近期细数了今年值得关注的七大技术。面向蛋白质设计的深度学习20年前,华盛顿大学的david Baker和同事取得了一个重要突破:他们用计算工具从头设计了一种全新的蛋白质。“Top7”能按预期折叠,但它是惰性的:没有实际的生物学功能。如今,从头开始(de novo)的蛋白质设计已经成熟,成了生产定制酶和其他蛋白质的实用工具。“这个技术现在很强大,”与Baker团队合作设计基于蛋白的疫苗和药物递送载体的华盛顿大学生物化学家Neil King说,“一年半前还是不可能的事,现在说做就做。”

关键词： 3d打印生物化学家深度学习蛋白质工程华盛顿大学计算工具团队合作

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Factorizations that Involve Ramanujan＇s Function k（q） = r（q）r2（q2）

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Acta Mathematica Sinica,English Series 2011年第12期27卷 2301-2308页

作者： Shaun COOPER michael d. HIRSCHHORN Institute of Information and Mathematical Sciences Massey University-Albany Private Bag 102904North Shore Mail Centre Auckland New Zealand School of Mathematics and Statistics UNSW Sydney NSW 2（}52 Australia

In the ＂lost notebook＂, Ramanujan recorded infinite product expansions for where r -= r（q） is the Rogers-Ramanujan continued fraction. We shall give analogues of these results that involve Ramanujan＇s function k ... 详细信息

关键词： Infinite product Rogers-Ramanujan continued fraction Jacobi triple product identity

Simulation of ductile fracture initiation in steels using a stress triaxiality-shear stress coupled model

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Acta Mechanica Sinica 2019年第3期35卷 600-614页

作者： Yazhi Zhu michael d.Engelhardt Zuanfeng Pan department of Structural Engineering Tongji UniversityShanghai 200092China Ferguson Structural Engineering Laboratory Department of CivilArchitectural and Environmental EngineeringUniversity of Texas at AustinAustinTX 78712USA

Micromechanics-based models provide powerful tools to predict initiation of ductile fracture in steels. A new criterion is presented herein to study the process of ductile fracture when the effects of both stress triaxiality and shear stress on void growth and coalescence are considered. Finite-element analyses of two different kinds of steel, viz. ASTM A992 and AISI 1045, were carried out to monitor the history of stress and strain states and study the methodology for determining fracture initiation. Both the new model and void growth model (VGM) were calibrated for both kinds of steel and their accuracy for predicting fracture initiation evaluated. The results indicated that both models offer good accuracy for predicting fracture of A992 steel. However, use of the VGM leads to a significant deviation for 1045 steel, while the new model presents good performance for predicting fracture over a wide range of stress triaxiality while capturing the effect of shear stress on fracture initiation.

关键词： ductile fracture Void growth Stress triaxiality Shear stress ratio ASTM A992 steel AISI 1045 steel

CHO cell cytotoxicity and genotoxicity analyses of disinfection by-products： An updated review

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Journal of Environmental Sciences 2017年第8期29卷 64-76页

作者： Elizabeth d.Wagner michael J.Plewa Safe Global Water Institute University of Illinois at Urbana-Champaign 1101 W Peabody Dr. Urbana IL 61801 United States department of Crop Sciences University of Illinois at Urbana-Champaign 1101 W Peabody Dr. Urbana IL 61801 United States

The disinfection of drinking water is an important public health service that generates high quality, safe and palatable tap water. The disinfection of drinking water to reduce waterborne disease was an outstanding public health achievement of the 20 th *** unintended consequence is the reaction of disinfectants with natural organic matter,anthropogenic contaminants and bromide/iodide to form disinfection by-products（dBPs）.A large number of dBPs are cytotoxic, neurotoxic, mutagenic, genotoxic, carcinogenic and teratogenic. Epidemiological studies demonstrated low but significant associations between disinfected drinking water and adverse health effects. The distribution of dBPs in disinfected waters has been well defined by advances in high precision analytical chemistry. Progress in the analytical biology and toxicology of dBPs has been *** objective of this review was to provide a detailed presentation of the methodology for the quantitative, comparative analyses on the induction of cytotoxicity and genotoxicity of103 dBPs using an identical analytical biological platform and endpoints. A single Chinese hamster ovary cell line was employed in the assays. The data presented are derived from papers published in the literature as well as additional new data and represent the largest direct quantitative comparison on the toxic potency of both regulated and emerging *** data may form the foundation of novel research to define the major forcing agents of dBP-mediated toxicity in disinfected water and may play an important role in achieving the goal of making safe drinking water better.

关键词： dBPs Mammalian cell cytotoxicity Mammalian cell genotoxicity

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