检索结果-南通市图书馆

Deep optics preconditioner for modulation-free pyramid wavefront sensing

Photonics Research 2024年第2期12卷 301-312页

作者： FELIPE GUZMÁN jorge tapia CAMILO WEINBERGER NICOLÁS HERNÁNDEZ jorge BACCA BENOIT NEICHEL ESTEBAN VERA School of Electrical Engineering Pontificia Universidad Católica de Valparaı´soValparaı´soChile Department of Systems Engineering Universidad Industrial de SantanderBucaramangaColombia Laboratoire d’Astrophysique de Marseille MarseilleFrance

The pyramid wavefront sensor(PWFS)can provide the sensitivity needed for demanding adaptive optics applications,such as imaging exoplanets using the future extremely large telescopes of over 30 m of diameter(D).However,its exquisite sensitivity has a limited linear range of operation,or dynamic range,although it can be extended through the use of beam modulation—despite sacrificing sensitivity and requiring additional optical *** by artificial intelligence techniques,this work proposes to train an optical layer—comprising a passive diffractive element placed at a conjugated Fourier plane of the pyramid prism—to boost the linear response of the pyramid sensor without the need for cumbersome *** develop an end-2-end simulation to train the diffractive element,which acts as an optical preconditioner to the traditional least-square modal phase estimation *** results with a large range of turbulence conditions show a noticeable improvement in the aberration estimation performance equivalent to over 3λ∕D of modulation when using the optically preconditioned deep PWFS(DPWFS).Experimental results validate the advantages of using the designed optical layer,where the DPWFS can pair the performance of a traditional PWFS with 2λ∕D of *** and adding an optical preconditioner to the PWFS is just the tip of the iceberg,since the proposed deep optics methodology can be used for the design of a completely new generation of wavefront sensors that can better fit the demands of sophisticated adaptive optics applications such as ground-to-space and underwater optical communications and imaging through scattering media.

关键词： process optics pyramid

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Machine-Learning-Assisted Design of Deep Eutectic Solvents Based on Uncovered Hydrogen Bond Patterns

引用

Engineering 2024年第8期39卷 74-83页

作者： Usman L.Abbas Yuxuan Zhang Joseph tapia Selim Md Jin Chen Jian Shi Qing Shao Department of Chemical and Materials Engineering University of KentuckyLexingtonKY 40506USA Department of Biosystems and Agricultural Engineering University of KentuckyLexingtonKY 40506USA Institute for Biomedical Informatics Department of Computer ScienceUniversity of KentuckyLexingtonKY 40506USA

Non-ionic deep eutectic solvents(DESs)are non-ionic designer solvents with various applications in catalysis,extraction,carbon capture,and ***,discovering new DES candidates is challenging due to a lack of efficient tools that accurately predict DES *** search for DES relies heavily on intuition or trial-and-error processes,leading to low success rates or missed *** that hydrogen bonds(HBs)play a central role in DES formation,we aim to identify HB features that distinguish DES from non-DES systems and use them to develop machine learning(ML)models to discover new DES *** first analyze the HB properties of 38 known DES and 111 known non-DES systems using their molecular dynamics(MD)simulation *** analysis reveals that DES systems have two unique features compared to non-DES systems:The DESs have①more imbalance between the numbers of the two intra-component HBs and②more and stronger inter-component *** on these results,we develop 30 ML models using ten algorithms and three types of HB-based *** model performance is first benchmarked using the average and minimal receiver operating characteristic(ROC)-area under the curve(AUC)*** also analyze the importance of individual features in the models,and the results are consistent with the simulation-based statistical ***,we validate the models using the experimental data of 34 *** extra trees forest model outperforms the other models in the validation,with an ROC-AUC of *** work illustrates the importance of HBs in DES formation and shows the potential of ML in discovering new DESs.

关键词： Machine learning Deep eutectic solvents Molecular dynamics simulations Hydrogen bond Molecular design

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Artificial Intelligence Based on Resilient Leadership in the Health Sector-A Secondary Publication

引用

Proceedings of Business and Economic Studies 2024年第2期7卷 222-233页

作者： Elaine Bastidas tapia Dr.Rafael Belloso Chacin University Venezuela

At present,it is impossible to deny the existence of artificial intelligence in various areas of social life,understood as the simulation of expert human intelligence from computer processes that involve learning,reasoning,and self-correction,its benefits to the medical field,in particular,are innumerable,but their incorporation into health systems has been gradual for many *** to the above,this research analyzed artificial intelligence based on resilient leadership in the health sector,for which qualitative research was carried out with a documentary-bibliographic design with printed and electronic documentary sources with theoretical contributions fromÁvila,Mayer,and Quesada[1],Morgan[2],Villa[3],and Finol[4],among *** is highlighted that resilient leadership has become a strategic factor in all organizations,since times of uncertainty and changes lead institutions to properly manage the incorporation of technologies specifically AI,achieving in this way that the centers and professionals in the field of health assume the needs of the contexts and the innovations of the *** is concluded that resilient leadership will allow artificial intelligence in the health sector to generate higher levels of learning and adaptability to the transformations that are necessary,whose resistance would make its application difficult and in the long run it will leave behind professionals who refuse to assume the contributions of these innovative techniques in medical practice.

关键词： Artificial intelligence Resilient leadership Health sector

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Clinical characteristics of a group of adults with nodular lymphoid hyperplasia:A single center experience

引用

World Journal of Gastroenterology 2006年第12期12卷 1945-1948页

作者： Alberto Rubio-tapia jorge Hernández-Calleros Luis Uscanga Sagrario Trinidad-Hernández Department of Gastroenterology Instituto Nacional de Ciencias Medicas y Nutricion Salvador Zubiran(INNSZ)Mexico CityMexico Department of Pathology Instituto Nacional de Ciencias Medicas y Nutricion Salvador Zubiran(INNSZ)Mexico CityMexico

AIM： To describe the clinical and histological characteristics of a group of adults with small-bowel nodular lymphoid hyperplasia （NLH）. METHODS： Patients were searched for five years in pathology records of our institution. The biopsy material was reassessed using strict histopathological criteria. Clinical data were obtained from medical records. RESULTS： Small-bowel NLH was diagnosed in 18 cases. The female： male ratio was 2 ： 1. The most frequent symptoms were diarrhea （72%）, involuntary weight loss （72%） and abdominal pain （61%）. Nine patients （50%） had immunodeficiency. Small-bowel bacterial overgrowth was found in three （17%） cases. At small-bowel NLH diagnosis, three （17%） had associated lymphoma： two intestinal and one extra-intestinal lymphomas. In two patients with villous atrophy and anti-endomysial antibodies the diagnosis of celiac disease was established. Giardia larnblia infection was found in only one patient with hypogammaglobulinemia （Herman＇s syndrome）. CONCLUSIONS： NLH is uncommon in adult patients. Associated diseases are immunodeficiency and lymphoid tissue malignancies.

关键词： Nodular lymphoid hyperplasia Hypogammaglobulinemia Lymphoma

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

新英格兰医学中心后循环登记

引用

中华脑血管病论坛 2005年第2期3卷 191-199页

作者： Louis R. Caplan Robert J. Wityk Thomas A. Glass jorge tapia Ladislav Pazdera Hui-Meng Chang Phillip Teal John F. Dashe Claudia J. Chaves Joan C. Breen Kostas Vemmos Pierre Amarenco Barbara Tettenborn Megan Leary Conrad Estol, L Dana Dewitt Michael S. Pessin 程言博（校）刘春风（校）不详苏州大学附属第二医院神经内科 215004

在407例新英格兰医学中心后循环登记患者中，59%为不伴TIA的卒中，24%在卒中前有TIA，16%仅表现为TIA。栓塞是最常见的卒中机制（占40%，其中24%为心源性栓塞，14%为动脉-动脉栓塞，2%两者兼有）。在32%的患者中，大动脉闭塞性损害导致... 详细信息

在407例新英格兰医学中心后循环登记患者中，59%为不伴TIA的卒中，24%在卒中前有TIA，16%仅表现为TIA。栓塞是最常见的卒中机制（占40%，其中24%为心源性栓塞，14%为动脉-动脉栓塞，2%两者兼有）。在32%的患者中，大动脉闭塞性损害导致血流动力学性脑缺血。梗死最常出现在后循环远段供血区（脑干腹侧、小脑上部以及枕叶和颞叶），近段（延髓和小脑后下部）和中段（桥脑和小脑前下部）供血区受累的比例相当。148例患者存在至少累及1支大动脉的重度闭塞性损害（狭窄〉50%），134例患者有单侧或双侧动脉受累。最常见的闭塞部位是椎动脉颅外段（52例患者，15例双侧）、椎动脉颅内段（40例患者，12例双侧）和基底动脉（46例患者）。动脉-动脉栓塞是椎动脉闭塞性疾病患者最常见的脑梗死发病机制。30d病死率为3.6%。发病机制为栓塞，远段供血区受累和基底动脉闭塞性疾病患者的预后最差。具有多处动脉狭窄部位的患者转归最好。他们通常经年累月地发生TIA。

关键词：新英格兰循环医学发病机制血流动力学 TIA 动脉患者脑缺血小脑

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Gut microbiota in preterm infants receiving breast milk or mixed feeding

引用

World Journal of Clinical Pediatrics 2024年第2期13卷 135-145页

作者： Sandra Gabriela Sánchez-González Bárbara Gabriela Cárdenas-del-Castillo Elvira Garza-González Gerardo R Padilla-Rivas Isaías Rodríguez-Balderrama Consuelo Treviño-Garza Fernando Félix Montes-tapia Gerardo C Palacios-Saucedo Anthony Gutiérrez-Rodríguez Manuel Enrique de-la-O-Cavazos Department of Pediatrics Hospital Universitario“Dr.JoséEleuterio González”Universidad Autónoma de Nuevo LeónMonterrey 64460Nuevo LeónMéxico Departamento de Bioquímica y Medicina Molecular Universidad Autónoma de Nuevo LeónMonterrey 64460Nuevo LeónMéxico Department of Biochemistry and Molecular Medicine Universidad Autónoma de Nuevo LeónMonterrey 64460Nuevo LeónMéxico Department of Pediatric Surgery Hospital Universitario"Dr.JoséEleuterio González"Monterrey 64460Nuevo LeónMéxico

BACKGROUND Preterm birth is the leading cause of mortality in newborns,with very-low-birthweight infants usually experiencing several *** milk is considered the gold standard of nutrition,especially for preterm infants with delayed gut colonization,because it contains beneficial microorganisms,such as Lactobacilli and *** To analyze the gut microbiota of breastfed preterm infants with a birth weight of 1500 g or *** An observational study was performed on preterm infants with up to 36.6 wk of gestation and a birth weight of 1500 g or less,born at the University Hospital ***éEleuterio González at Monterrey,Mexico.A total of 40 preterm neonates were classified into breast milk feeding(BM)and mixed feeding(MF)groups(21 in the BM group and 19 in the MF group),from October 2017 to June *** samples were collected before they were introduced to any feeding *** full enteral feeding was achieved,the composition of the gut microbiota was analyzed using 16S rRNA gene *** variables were compared using Student’s t-test or using the Mann–Whitney U test for nonparametric ***,evenness,equitability,Margalef’s index,Fisher’s alpha,Chao-1 index,and Shannon’s diversity index were also *** No significant differences were observed at the genus level between the *** comparison indicated higher counts of Alphaproteobacteria and Betaproteobacteria in the initial compared to the final sample of the BM group(P<0.011).In addition,higher counts of Gammaproteobacteria were detected in the final than in the initial sample(P=0.040).According to the Margalef index,Fisher’s alpha,and Chao-1 index,a decrease in species richness from the initial to the final sample,regardless of the feeding type,was observed(P<0.050).The four predominant phyla were Bacteroidetes,Actinobacteria,Firmicutes,and Proteobacteria,with Proteobacteria being the most ***,no significant differences were

关键词： Gut microbiota Human milk Preterm infant Proteobacteria Very low birth weight 16S rRNA

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Seamount chains and hotspot tracks:Superficially similar,deeply different

引用

Geoscience Frontiers 2023年第6期14卷 307-326页

作者： Edgardo Cañón-tapia División de Ciencias de la Tierra CICESE.Carretera Ensenada-Tijuana#3985Ensenada Baja CaliforniaCP 22860Mexico

Nearly 80%of the seafloor extension has not been covered by high-resolution bathymetry,impeding direct observation of ***,lists of seamount location and height at a global scale have been produced using different *** this work four of such databases(publicly available)are compared with each other to assess their *** identify large differences among databases that could have exerted strong influences on models of seamount production and associated geodynamic *** those differences,it is shown that all databases allow the identification of seamount lines both along the present-day Mid Ocean Ridge(MOR)system and on intraplate ***,those seamount lines do not coincide with the so-called hotspot tracks that commonly were defined by selectively focusing attention on the larger *** of all the databases also shows that distinction based only on seamount size between seamounts produced at Mid-Ocean Ridge(MOR)environments from those associated with mantle-plum fed-hotspot activity has been ***,combined with the fact that most seamount lines defined by the available databases can be traced back to past locations of MOR indicates that most of the present-day intraplate linear arrays of seamounts,which include some large seamounts,were not produced by the action of underlying mantle anomalies envisaged in the form of mantle *** evidence presented here calls for a reassessment of the form in which volcanic and tectonic activities are conceptually related to each other.

关键词： Seamount origin Chains of seamounts Spatial distribution of volcanism Intraplate volcanism Mid Ocean Ridge volcanism

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Estimation of rainfall thresholds for shallow landslides in the Sierra Madre Oriental, northeastern Mexico

引用

Journal of Mountain Science 2020年第7期17卷 1565-1580页

作者： jorge A.Salinas-Jasso Fernando Velasco-tapia Ignacio Navarro de León Ricardo A.Salinas-Jasso Efraín Alva-Nino Facultad de Ciencias de la Tierra Universidad Autónoma de Nuevo LeónEx-Hacienda de Guadalupe km 8.Carr.Linares-Cerro PrietoLinaresN.L.67700México Secretaría de Desarrollo Sustentable de Nuevo León Washington #2000Col.ObreraMonterreyN.L.64010México

Landslides induced by prolonged rainfalls are frequent mass movements along the northeastern portion of the Sierra Madre Oriental in Mexico,causing significant damage to *** this work,we have studied the connection between rainfall and landslides in the Santa Rosa Canyon,a catchment located in the northeastern Mexico.A landslide database triggered by major storms and hurricanes that have hit the region over the past 30 years was analyzed.A total of 92 rainfall events in the Santa Rosa Canyon were studied to determine the amount of precipitation needed to trigger shallow *** each event the duration(D,in hours)and the cumulated rainfall event(E,in mm)were determined by using historical rainfall data from weather stations located near the study *** have proposed an ED threshold for rainfall-induced landslides with durations 0.5

关键词： Shallow landslides Cumulated rainfall Rainfall thresholds Northeastern Mexico Early warning systems.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Quercetin prevents spinal motor neuron degeneration induced by chronic excitotoxic stimulus by a sirtuin 1-dependent mechanism

引用

Translational Neurodegeneration 2017年第1期6卷 310-323页

作者： Rafael Lazo-Gomez Ricardo tapia División de Neurociencias Instituto de Fisiología CelularUniversidad Nacional Autónoma de MéxicoCircuito exterior s/nCiudad UniversitariaCoyoacán04510 Ciudad de MéxicoMexico

Background:Excitotoxicity is a mechanism of foremost importance in the selective motor neuron degeneration characteristic of motor neuron *** therapeutic strategies are an unmet need for these ***,such as quercetin and resveratrol,are plant-derived compounds that activate sirtuins(SIRTs)and have shown promising results in some models of neuronal death,although their effects have been scarcely tested in models of motor neuron ***:In this work we investigated the effects of quercetin and resveratrol in an in vivo model of excitotoxic motor neuron death induced by the chronic infusion ofα-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid(AMPA)into the rat spinal cord *** and resveratrol were co-infused with AMPA and motor behavior and muscle strength were assessed daily for up to ten ***,animals were fixed and lumbar spinal cord tissue was analyzed by histological and immunocytological ***:We found that the chronic infusion of AMPA[1 mM]caused a progressive motor neuron degeneration,accompanied by astrogliosis and microgliosis,and motor deficits and paralysis of the rear *** infusion ameliorated AMPA-induced paralysis,rescued motor neurons,and prevented both astrogliosis and microgliosis,and these protective effects were prevented by EX527,a very selective SIRT1 *** contrast,neither resveratrol nor EX527 alone improved motor behavior deficits or reduced motor neuron degeneration,albeit both reduced ***:These results suggest that quercetin exerts its beneficial effects through a SIRT1-mediated mechanism,and thus SIRT1 plays an important role in excitotoxic neurodegeneration and therefore its pharmacological modulation might provide opportunities for therapy in motor neuron disorders.

关键词： Motor neuron disorder Quercetin Resveratrol Sirtuin Excitotoxicity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Loss of canonical Wnt signaling is involved in the pathogenesis of Alzheimer's disease

引用

Neural Regeneration Research 2018年第10期13卷 1705-1710页

作者： Cheril tapia-Rojas Nibaldo C.Inestrosa Centro de Envejecimiento y Regeneración (CARE UC) Departamento de Biología Celular y MolecularFacultad de Ciencias BiológicasPontificia Universidad Católica de Chile Centre for Healthy Brain Ageing School of PsychiatryFaculty of MedicineUniversity of New South Wales Centro de Excelencia en Biomedicina de Magallanes (CEBIMA) Universidad de Magallanes

Alzheimer＇s disease（AD） is the most common form of dementia in the older population, however, the precise cause of the disease is unknown. The neuropathology is characterized by the presence of aggregates formed by amyloid-β（Aβ） peptide and phosphorylated tau; which is accompanied by progressive impairment of memory. Diverse signaling pathways are linked to AD, and among these the Wnt signaling pathway is becoming increasingly relevant, since it plays essential roles in the adult brain. Initially, Wnt signaling activation was proposed as a neuroprotective mechanism against Aβ toxicity. Later, it was reported that it participates in tau phosphorylation and processes of learning and memory. Interestingly, in the last years we demonstrated that Wnt signaling is fundamental in amyloid precursor protein（APP） processing and that Wnt dysfunction results in Aβ production and aggregation in vitro. Recent in vivo studies reported that loss of canonical Wnt signaling exacerbates amyloid deposition in a transgenic（Tg） mouse model of AD. Finally, we showed that inhibition of Wnt signaling in a Tg mouse previously at the appearance of AD signs, resulted in memory loss, tau phosphorylation and Aβ formation and aggregation; indicating that Wnt dysfunction accelerated the onset of AD. More importantly, Wnt signaling loss promoted cognitive impairment, tau phosphorylation and Aβ1–42 production in the hippocampus of wild-type（WT） mice, contributing to the development of an Alzheimer＇s-like neurophatology. Therefore, in this review we highlight the importance of Wnt/β-catenin signaling dysfunction in the onset of AD and propose that the loss of canonical Wnt signaling is a triggering factor of AD.

关键词： Wnt signaling Wnt target genes Wnt/β-catenin Alzheimer disease amyloid-β tau phosphorylation memory loss synaptic dysfunction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：