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数据采集的改进——“对地震地层学的回答”

石油地球物理勘探 1982年第2期 11-15页

作者： t.a.khan 罗维炳

在数据采集的各个阶段,地震信号都受到不同类型噪声的干扰。这些噪声可分为四种基本类型: 仪器噪声; 震源产生的规则噪声; 电磁感应噪声; 文明噪声。由于数据中的振幅和相位信息只有在有利的信噪比条件下才可用于度量岩性,因此,信噪比... 详细信息

在数据采集的各个阶段,地震信号都受到不同类型噪声的干扰。这些噪声可分为四种基本类型: 仪器噪声; 震源产生的规则噪声; 电磁感应噪声; 文明噪声。由于数据中的振幅和相位信息只有在有利的信噪比条件下才可用于度量岩性,因此,信噪比已成为一种关键的因素。在发展数据采集系统时需要新的手段,即: 在日常工作中连续监控各数据道的信噪比; 估价震源产生的规则噪声的主频和速度,从而修正野外工作参数以取得最佳的信噪比; 利用特殊的,优于标准陷波器与共模滤波器的线路,抑制电磁感应; 用算法降低文明噪声引起的数据恶化; 提供更加接近于最终产品的数据监控器; 定量评价每个总记录道的保真度。这样,可以向地球物理学家提供一套更加完整的数据,由之可以确定出最佳采集与处理参数。

关键词：噪声主频文明地震信号高压线震源噪音数据处理数据采集信号噪声比信噪比

Modeling the dynamical behavior of the interaction of t-cells and human immunodeficiency virus with saturated incidence

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Communications in theoretical Physics 2024年第3期76卷 1-14页

作者： Salah Boulaaras Rashid Jan Amin khan Ali Allahem Imtiaz Ahmad Salma Bahramand Department of Mathematics College of ScienceQassim UniversityBuraydah51452Saudi Arabia Institute of Energy Infrastructure(IEI) Department of Civil EngineeringCollege of EngineeringUniversiti Tenaga Nasional(UNITEN)Putrajaya CampusJalan IKRAM-UNITEN43000 KajangSelangorMalaysia Department of Mathematics University of SwabiSwabi 23561Pakistan Department of Mathematics College of SciencesQassim UniversitySaudi Arabia Institute of Informatics and Computing in Energy(IICE) Universiti Tenaga NasionalKajangSelangorMalaysia Department of Political Science Bacha Khan University CharsaddaCharsadda 24420KPK Pakistan

In the last forty years,the rise of HIV has undoubtedly become a major concern in the field of public health,imposing significant economic burdens on affected ***,it becomes imperative to undertake comprehensive investigations into the mechanisms governing the dissemination of HIV within the human *** this work,we have devised a mathematical model that elucidates the intricate interplay between CD4^(+)t-cells and viruses of HIV,employing the principles of fractional *** production rate of CD4^(+)t-cells,like other immune cells depends on certain factors such as age,health status,and the presence of infections or ***,we incorporate a variable source term in the dynamics of HIV infection with a saturated incidence rate to enhance the precision of our *** introduce the fundamental concepts of fractional operators as a means of scrutinizing the proposed HIV *** facilitate a deeper understanding of our system,we present an iterative scheme that elucidates the trajectories of the solution pathways of the *** show the time series analysis of our model through numerical findings to conceptualize and understand the key factors of the *** addition to this,we present the phase portrait and the oscillatory behavior of the system with the variation of different input *** information can be utilized to predict the long-term behavior of the system,including whether it will converge to a steady state or exhibit periodic or chaotic oscillations.

关键词： HIV infection fractional-calculus dynamics of HIV iterative scheme dynamical behaviour mathematical model fractional derivatives

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Unsupervised Color Segmentation with Reconstructed Spatial Weighted Gaussian Mixture Model and Random Color Histogram

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Computers, Materials & Continua 2024年第3期78卷 3323-3348页

作者： Umer Sadiq khan Zhen Liu Fang Xu Muhib Ullah khan Lerui Chen touseef Ahmed khan Muhammad Kashif Khattak Yuquan Zhang School of Computer and Information Science Hubei Engineering UniversityXiaogan432000China Institute for AI Industrial technology Research Hubei Engineering UniversityXiaogan432000China Key Lab of Mountain Hazards and Surface Processes Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu610041China University of Chinese Academy of Sciences Beijing100049China College of Aviation Zhongyuan University of TechnologyZhengzhou451191China Research Center of Digital Mountain and Remote Sensing Application Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu610041China School of Computer Science University of PoonchAzad Jammu Kashmir12350Pakistan School of Computer Science and Information Engineering Hubei UniversityWuhan430062China

Image classification and unsupervised image segmentation can be achieved using the Gaussian mixture *** the Gaussian mixture model enhances the flexibility of image segmentation,it does not reflect spatial information and is sensitive to the segmentation *** this study,we first present an efficient algorithm that incorporates spatial information into the Gaussian mixture model(GMM)without parameter *** proposed model highlights the residual region with considerable information and constructs color ***,we incorporate the content-based color saliency as spatial information in the Gaussian mixture *** segmentation is performed by clustering each pixel into an appropriate component according to the expectation maximization and maximum ***,the random color histogram assigns a unique color to each cluster and creates an attractive color by default for segmentation.A random color histogram serves as an effective tool for data visualization and is instrumental in the creation of generative art,facilitating both analytical and aesthetic *** experiments,we have used the Berkeley segmentation dataset BSDS-500 and Microsoft Research in Cambridge *** the study,the proposed model showcases notable advancements in unsupervised image segmentation,with probabilistic rand index(PRI)values reaching 0.80,BDE scores as low as 12.25 and 12.02,compactness variations at 0.59 and 0.7,and variation of information(VI)reduced to 2.0 and 1.49 for the BSDS-500 and MSRC datasets,respectively,outperforming current leading-edge methods and yielding more precise segmentations.

关键词： Unsupervised segmentation color saliency spatial weighted GMM random color histogram

Hepatocellular Carcinoma Incidence and Mortality in the USA by Sex, Age, and Race: A Nationwide Analysis of two Decades

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Journal of Clinical and translational Hepatology 2024年第2期12卷 172-181页

作者： Yazan Abboud Mohamed Ismail Hamza khan Esli Medina-Morales Saqr Alsakarneh Fouad Jaber Nikolaos t.Pyrsopoulos Department of Internal Medicine Rutgers New Jersey Medical SchoolNewarkNJUSA Department of Internal Medicine University of Missouri-Kansas CityKansas CityMOUSA Division of Gastroenterology and Hepatology Rutgers New Jersey Medical SchoolNewarkNJUSA

Background and Aims:While the incidence rates of hepa-tocellular carcinoma(HCC)are increasing,there are limited comprehensive data on demographic-specific incidence and mortality trends in the *** aimed to evaluate recent trends in HCC incidence and mortality among different de-mographic groups in the ***:Age-adjusted HCC incidence rates were calculated from the Centers for Disease Control's United States Cancer Statistics database,which combines incidence data on newly diagnosed cancer cases and covers approximately 98%of the population in the ***,age-adjusted HCC mortality rates were obtained from the Centers for Disease Control's National Center for Health Statistics database,which offers comprehensive Cov-erage spanning nearly 100%of deaths attributed to HCC in the *** were stratified by sex,age(older[≥55 years]and younger[ts),race and ethnicity(Non-Hispanic White,Non-Hispanic Black,Hispanic,Non-Hispanic Asian/Pacific Islander,and Non-Hispanic American Indian/Alaska Native),and tumor stage at diagnosis(early and late).Annual and average annual percentage change(AAPC)were calculated using joinpoint regression.A sex-specific pairwise comparison was ***:Between 2001 and 2020,there were 467,346 patients diagnosed with HCC(26.0%women),with increasing incidence in both sexes without significant difference(p=0.65).In younger adults(78,169 patients),the incidence decreased in men but not in women(AAPC difference=-2.39,p=0.002).this was seen in various racial and ethnic groups,mostly driven by early-stage tumors(AAPC difference=-2.65,p=0.02).there were 329,973 deaths attributed to HCC between 2000 and 2020(28.4%women).In younger adults(43,093 deaths),mortal-ity decreased in men at a greater rate than in women(AAPC difference=1.61,p=0.007).this was seen in various racial and ethnic groups,most notably in non-Hispanic American Indian/Alaska Natives(AAPC difference=-4.51,p=0.01).Conclusions:Nationwide USA data,coveri

关键词： Liver cancer Hepatocellular carcinoma Incidence Mortality Epidemiology Health disparity

Autologous hematopoietic stem cell transplantation conditioning regimens and chimeric antigen receptor t cell therapy in various diseases

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World Journal of transplantation 2024年第1期14卷 32-41页

作者： Shahzaib Maqbool Maryam Farhan Baloch Muhammad Abdul Khaliq khan Azeem Khalid Kiran Naimat Department of Medicine Holy Family HospitalRawalpindi 46000Pakistan Department of Community Medicine Allama Iqbal Medical CollegeLahore 45000Pakistan Department of Community Dentistry Baqai Medical UniversityKarachi 43000Pakistan Department of Medicine Allama lqbal Medical CollegeLahore 45000Pakistan Department of MedicineLiaquat University of Medical and Health Sciences Karachi 43000Pakistan

Conditioning regimens employed in autologous stem cell transplantation have been proven useful in various hematological disorders and underlying malignancies;however,despite being efficacious in various instances,negative consequences have also been *** conditioning regimens were extracted from various literature searches from databases like PubMed,Google scholar,EMBASE,and *** regimens for each disease were compared by using various end points such as overall survival(OS),progression free survival(PFS),and leukemia free survival(LFS).Variables were presented on graphs and analyzed to conclude a more efficacious conditioning *** multiple myeloma,the most effective regimen was high dose melphalan(MEL)given at a dose of 200/mg/*** comparative results of acute myeloid leukemia were presented and the regimens that proved to be at an admirable position were busulfan(BU)+MEL regarding OS and BU+VP16 regarding *** case of acute lymphoblastic leukemia(ALL),BU,fludarabine,and etoposide(BuFluVP)conferred good disease control not only with a paramount improvement in survival rate but also low risk of ***,for ALL,chimeric antigen receptor(CAR)t cell therapy was preferred in the context of better OS and *** respect to Hodgkin’s lymphoma,mitoxantrone(MItO)/MEL overtook carmustine,VP16,cytarabine,and MEL in view of PFS and vice versa regarding ***-Hodgkin’s lymphoma patients were administered MItO(60 mg/m2)and MEL(180 mg/m2)which showed promising ***,amyloidosis was considered,and the regimen that proved to be competent was MEL 200(200 mg/m2).this review article demonstrates a comparison between various conditioning regimens employed in different diseases.

关键词： Conditioning regimens Multiple myeloma Lymphoma Hodgkin Non-Hodgkin Acute leukemia

Assessing gully erosion and rehabilitation using multi temporal LiDAR DEMs:Case study from the Great Barrier Reef catchments,Australia

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International Soil and Water Conservation Research 2024年第1期12卷 184-199页

作者： Sana khan Rebecca Bartley Anne Kinsey-Henderson Aaron Hawdon the Commonwealth Scientific and Industrial Research Organisation(CSIRO) Environment1 James Cook DrDouglas4814Australia the Commonwealth Scientific and Industrial Research Organisation(CSIRO) EnvironmentGPO Box 2583BrisbaneQLD4001Australia

Millions of dollars are being spent on gully rehabilitation to help reduce excess fine sediment delivery to the Great Barrier Reef(GBR).there is an urgent need for(i)prioritisation of active gullies for rehabilitation and(ii)the development of methodologies to inform the effectiveness of *** this study we analyse DEMs of Difference derived from 0.5 m resolution 2-3 year interval multi-temporal LiDAR data collected pre and post rehabilitation at three variable gully morphologies in the Burdekin *** analysis indicates that the highest annual average fine sediment erosion rates for the untreated control gullies occur at the linear gully(53.38 t ha^(-1)y^(-1))followed by linear-alluvial gully(34.24 t ha^(-1)y^(-1))and least at the alluvial gully(14.41 t ha^(-1)y^(-1)).the proportional loss or export of fine sediment from the gullies in their un-treated condition ranges from∼68 to 90%of what is eroded,and when the gullies are treated the proportion of fine sediment that is retained in the gully proportional to what is eroded increases to∼60%at all *** pre-treatment baseline erosion rates,and additional post treatment LiDAR captures,it is difficult to quantify the treatment *** results offer insights in the erosion mechanisms within different geomorphic gully morphologies and rehabilitation effects in these erosional *** study provides crucial knowledge of gully dynamics that can be coupled with other lines of evidence for better prioritisation of rehabilitation in the GBR catchments.

关键词： Digital elevation models (dis)connectivity Restoration Geomorphic change detection Geomorphic effectiveness GIS

Isolated Hyperacute t-Waves in West Nile Encephalitis Indicating Atypical Variant of Stress-Induced Cardiomyopathy

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Journal of Biosciences and Medicines 2024年第2期12卷 303-310页

作者： Soomal Rafique Nadeem khan Momin Siddique School of Medicine Southern Illinois University Springfield USA

Several cardiac outcomes have been reported with West Nile-encephalitis;however, the underlying pathophysiology remains complex. We present a 42-year-old female, with multiple sclerosis, whose neurological symptoms and respiratory decline were finally explained by the diagnosis of West Nile-encephalitis. During her admission, the isolated peaked t-waves indicated the underlying stress-induced cardiomyopathy. the absence of all other causes of hyperacute t-waves, their subsequent resolution with the resolution of infection and improvement in wall motion abnormalities, further supported the association. this case highlights the importance of considering hyperacute t-waves in an approach towards the diagnosis of WNV-encephalitis related atypical variant of stress-induced cardiomyopathy.

关键词： West Nile Virus encephalitis WNV Hyperacute t-Waves takotsubo Cardiomyopathy Atypical/Inverted Variant of Stress-Induced Cardiomyopathy CMP

Coupling of reduced inorganic fertilizer with plant-based organic fertilizer as a promising fertilizer management strategy for colored rice in tropical regions

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Journal of Integrative Agriculture 2024年第1期23卷 93-107页

作者： tingcheng Zhao Aibin He Mohammad Nauman khan Qi Yin Shaokun Song Lixiao Nie Research Center for Physiology and Ecology and Green Cultivation of tropical Crops School of Breeding and Multiplication(Sanya Institute of Breeding and Multiplication)Hainan UniversitySanya 572000China

Colored rice is a type of high-quality,high-added-value rice that has attracted increasing attention in recent *** use of large amounts of inorganic nitrogen fertilizer in rice fields results in low fertilizer use efficiency and high environmental *** fertilizer is a promising way to improve soil quality and sustain high ***,most studies focus on the effect of animal-based organic *** effects of different ratios of plantbased organic fertilizer and inorganic fertilizer on the grain yield and quality of colored rice have rarely been ***,a two-year field experiment was conducted in 2020 and 2021 to study the effects of replacing inorganic N fertilizers with plant-based organic fertilizers on the yield,nitrogen use efficiency(NUE),and anthocyanin content of two colored rice varieties in a tropical region in *** experimental treatments included no nitrogen fertilization(t1),100% inorganic nitrogen fertilizer(t2),30%inorganic nitrogen fertilizer substitution with plant-based organic fertilizer(t3),60%inorganic nitrogen fertilizer substitution with plant-based organic fertilizer(t4),and 100% plantbased organic fertilizer(t5).the total nitrogen provided to all the treatments except t1 was the same at 120 kg *** results showed that the t3 treatment enhanced the grain yield and anthocyanin content of colored rice by increasing nitrogen use efficiency compared with *** average,grain yields were increased by 9 and 8%,while the anthocyanin content increased by 16 and 10% in the two colored rice varieties under t3 across the two years,respectively,as compared with *** study of the residual effect of partial substitution of inorganic fertilizers showed that the substitution of inorganic fertilizer with plant-based organic fertilizer improved the soil physiochemical properties,and thus increased the rice grain yield,in the subsequent *** highest grain yield of the subsequent rice crop was observe

关键词： colored rice organic fertilizer soil quality grain yield anthocyanin

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therapeutic nucleic acids in regenerative medicine and tissue repair

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Nano Research 2024年第10期17卷 8942-8976页

作者： Qimanguli Saiding Duotian Qin Soohwan An Dylan Neal Patel Muhammad Muzamil khan Na Kong Wei tao Center for Nanomedicine and Department of Anesthesiology Brigham and Women’s HospitalHarvard Medical SchoolBostonMassachusetts 02115USA

In the vanguard of biomedical innovation,regenerative medicine emerges as a transformative paradigm,concentrating its efforts on rectifying tissue deficits and functional aberrations in patients through the strategic augmentation of endogenous cellular *** to this approach is nucleic acid therapy,which offers a novel pathway for tissue regeneration by modulating key signaling *** one of the most effective ways to regulate cell function,nucleic acids are crucial for various tissue regeneration;however,their in vivo therapeutic applications face substantial challenges,including nuclease degradation,cell membrane impermeability,and targeted intracellular ***-based gene delivery systems offer a solution for stable and localized drug delivery by enabling the controlled overexpression of therapeutic nucleic acids,producing functional regulatory *** review presents examples of nucleic acid applications in regenerative medicine,highlighting the synergy between nucleic acids and biomaterial *** underlines the importance of nucleic acid delivery techniques,the choice of therapeutic nucleic acids,and biomaterials for advancing tissue *** latest developments in designing nucleic acid biomaterial-based delivery vehicles are explored,the mechanism of nucleic acids in tissue regeneration is elucidated,and their limitations are discussed while considering future directions for the clinical translation of nucleic acid-based therapeutics.

关键词： tissue repair nucleic acids biomaterials delivery systems regenerative medicine