检索结果-南通市图书馆

维普期刊数据库

Directly modulated quantum dot lasers on silicon with a milliampere threshold and high temperature stability

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2018年第8期6卷 776-781页

作者： YATING WAN DAISUKE INOUE DAEHWAN JUNG JUSTIN c.NORMAN cHEN SHANG arthur c.gossard JOHN E.BOWERS Institute for Energy Efficiency University of California Santa Barbara Institute of Innovative Research Tokyo Institute of Technology Materials Department University of California Santa Barbara Department of Electrical and computer Engineering University of California Santa Barbara

Microring lasers feature ultralow thresholds and inherent wavelength-division multiplexing functionalities, offering an attractive approach to miniaturizing photonics in a compact area. Here, we present static and dynamic properties of microring quantum dot lasers grown directly on exact(001) GaP/Si. Effectively, a single-mode operation was observed at 1.3 μm with modes at spectrally distant locations. High temperature stability with T_0~103 K has been achieved with a low threshold of 3 mA for microrings with an outer ring radius of 15 μm and a ring waveguide width of 4 μm. Small signal modulation responses were measured for the first time for the microrings directly grown on silicon, and a 3 dB bandwidth of 6.5 GHz was achieved for a larger ring with an outer ring radius of 50 μm and a ring waveguide width of 4 μm. The directly modulated microring laser,monolithically integrated on a silicon substrate, can incur minimal real estate cost while offering full photonic functionality.

关键词：微环激光器通讯技术发展现状技术创新

维普期刊数据库

Determining rock crack stress thresholds using ultrasonic through-transmission measurements

在线全文

学校读者我要写书评

暂无评论

International Journal of coal Science & Technology 2024年第2期11卷 67-80页

作者： Jiangwan He Mehdi Serati Martin Veidt arthur De Alwis School of civil Engineering The University of QueenslandBrisbaneQLD 4072Australia School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQLD 4072Australia

The crack initiation stress threshold is widely used in excavation industries as rock spalling strength when designing deep underground structures to avoid unwanted brittle *** various strain-based methods have been developed for the estimation of this critical design parameter,such methods are destructive and often requires subjective interpretations of the stress–strain curves,particularly in rocks with pre-existing microcracks or high *** study explore the applicability of non-destructive ultrasonic through-transmission methods for determining rock damage levels by assessing the changes in transmitted signal characteristics during *** change in velocity,amplitude,dominant frequency,and root-mean-square voltage are investigated with four different rock types including marble,sandstone,granite,and basalt under various stress *** suggest the rate of signal variations can be reliably used to estimate crack closure and crack initiation stress levels across the tested rocks before *** of the results between the conventional techniques and the new proposed methods based on ultrasonic monitoring are further discussed.

关键词： Ultrasonic Non-destructive testing Brittle rock crack initiation Velocity Amplitude Frequency

Technological parameters of thin-film pulsed laser scribing for perovskite photovoltaics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

clean Energy 2024年第3期8卷 127-135页

作者： Rustam Ishteev Pavel Gostishchev Mariia Tiukhova Anton Sorokin arthur Ishteev Vladimir Kondratenko Laboratory of Precision Machining of Materials Department of NanoelectronicsInstitute for Advanced Technologies and Industrial ProgrammingRTU MIREAMoscowRussia Research and Practical clinical center for Diagnostics and Telemedicine Technologies of the Moscow Health care Department MoscowRussia Laboratory of Advanced Solar Energy(LASE) National University of Science and Technology MISIS4 Leninsky St.MoscowRussia Semenov Federal Research center of chemical Physics Russian Academy of Sciences(RAS)4 Kosygina str.MoscowRussia

Over the past decade,the power conversion efficiency of halide perovskite solar cells has shown a rapid increase to 26.1%.The significant efficiency growth and the relative simplification of the technology for obtaining thin-film solar cells due to liquid printing methods determine the high potential for the low-cost perovskite solar cells ***,efficient use of cell geometry is comparable to the size of standard crystalline-Si wafers(156:156 mm and more).Therefore,modular geometry similar to amorphous-Si solar cell approaches is used to scale perovskite solar *** electrical connection of thin-film cells requires precise processing of the conductive layers that form the device p-i-n *** subject of research is the development of a full pulsed laser scribing cycle for inverted perovskite solar *** this work,we propose a study of a laser-patterning technology In_(2)O_(3):SnO_(2)(ITO)conductive layer and a photoactive perovskite layer cs0,2(cH(NH_(2))_(2))_(0,8)PbI_(3).Process regimes of transparent conducting electrodes based on ITO and halide perovskite layer cs_(0,2)(cH(NH_(2))_(2))_(0,8)PbI_(3)laser patterning were *** optimal parameters for the multipass mode processing of ITO and perovskite layer were *** cell was electrically isolated at a scribe line width of 30μm.

关键词： patterning perovskite solar cell perovskite solar cell photovoltaics scribing

Distribution of licensed acupuncturists and educational institutions in the United States at the start of 2023,during the late stage of the cOVID-19 pandemic

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Medicine 2024年第4期22卷 379-384页

作者： arthur Yin Fan De-guang He Anu Sangraula Sarah Faggert Alemi Amy Matecki American Traditional chinese Medicine Association ViennaVA 22182USA McLean center for complementary and Alternative Medicine ViennaVA 22182USA New England School of Acupuncture Massachusetts College of Pharmacy and Health SciencesBostonMA 02115USA Lombardi comprehensive cancer center Cancer Prevention and Control ProgramGeorgetown UniversityWashington DC 20057USA Eastern Roots Wellness PLCMcLeanVA 22101USA Sutter Health Alta Bates Summit Medical CenterOaklandCA 94609USA

This study was conducted to identify the number and density of active licensed acupuncturists(LAcs),as well as the number of accredited schools in acupuncture and Oriental medicine(AOM),as of January 1,2023,in the United States(U.S.).The number of active LAcs as of January 1,2023 was 34,524,potentially33,364 after removing license duplication in multiple states,among which the largest three states were california(with 7317 LAcs[21.19%of the total]),New York(5024[14.55%])and Florida(2644[7.66%]).The total number of LAcs decreased by 8.87%from 2018,and fell short of our projected number of LAcs in 2023 by 9037,or 20.75%.The overall LAc density in the *** as the number of LAcs per 100,000 populationDwas 10.36,less than in *** were 56 active,accredited AOM schools which offered a total of 147 programs(121 at the level necessary for licensing[entry-level],12 for an advanced practicing degree[advanced-level],and 14 for certifications).Broken down further,offerings included 50 master's degrees in acupuncture,40 master's degrees in Oriental medicine,31 entry-level doctorate degrees(10 in acupuncture and 21 in acupuncture plus chinese herbal medicine),and 12advanced-level doctorate degrees in *** certification programs included one in East-Asian Medical Bodywork and 13 in *** these schools in 2023,institutions in the West and East coast states comprised 67.86%(decreased from 77.42%in 2018)of the national ***,Florida and Illinois represented 39.29%.There were 48 jurisdictions with acupuncture practice laws in *** data suggests that the acupuncture profession in the *** been significantly impacted during the coronavirus disease 2019 pandemic.

关键词： Acupuncturist Acupuncture educational institution Distribution Density Oriental medicine United States

维普期刊数据库

SnapshotPrune: A Novel Bitcoin-Based Protocol Toward Efficient Pruning and Fast Node Bootstrapping

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2024年第4期29卷 1037-1052页

作者： Pengfei Huang Xiaojun Ren Teng Huang arthur Sandor Voundi Koe Duncan S Wong Hai Jiang Institute of Artificial Intelligence and Blockchain Guangzhou UniversityGuangzhou 510006China Institute of Artificial Intelligence and Blockchain Guangzhou UniversityGuangzhou 510006Chinaand also with Pazhou LabGuangzhou 510330China

Node synchronization is essential for the stability of the Bitcoin network. critics have raised doubts about the ability of a new node to quickly and efficiently synchronize with the Bitcoin network and alleviate the storage pressure from existing full nodes to stockpile new data. Basic pruning and other techniques have been explored to address these concerns but have been insufficient to reduce node synchronization delay and effectively suppress the growth of synchronized data. In this study, we propose SnapshotPrune, a novel pruning and synchronization protocol that achieves fast node bootstrapping in the Bitcoin blockchain. Real Bitcoin historical data are leveraged to measure the synchronization time and monitor the network traffic during node bootstrapping. The protocol requires data downloads that are 99.70% less than Bitcoin core, 81% less than coinPrune, and 60% less than SnapshotSave, thereby saving 97.23% of download time. Findings show that the proposed design enhances the storage efficiency and reduces the node synchronization delay compared with existing techniques. We hypothesize that the efficiency of this protocol increases with the block height.

关键词： synchronization blockchain Unspent Transaction Output(UTXO)pruning snapshot fast bootstrapping

Genome-Wide Discovery and Expression Profiling of the SWEET Sugar Transporter Gene Family in Woodland Strawberry (Fragaria vesca) under Developmental and Stress conditions: Structural and Evolutionary Analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2024年第7期93卷 1485-1502页

作者： Shoukai Lin Yifan Xiong Shichang Xu Manegdebwaoaga arthur Fabrice Kabore Fan Lin Fuxiang Qiu college of Environmental and Biological Engineering Putian UniversityPutian351100China college of Life Science Fujian Agriculture and Forestry UniversityFuzhou350002China Fujian Provincial Key Laboratory of Ecology-Toxicological Effects&control for Emerging contaminants Putian UniversityPutian351100China Key Laboratory of Ecological Environment and Information Atlas(Putian University) Fujian Provincial UniversityPutian351100China Affiliated Hospital of Putian University Putian351100China

The SWEET(sugar will eventually be exported transporter)family proteins are a recently identiﬁed class of sugar transporters that are essential for various physiological *** the functions of the SWEET proteins have been identiﬁed in a number of species,to date,there have been no reports of the functions of the SWEET genes in woodland strawberries(Fragaria vesca).In this study,we identiﬁed 15 genes that were highly homolo-gous to the *** AtSWEET genes and designated them as FvSWEET1–*** then conducted a structural and evolutionary analysis of these 15 FvSWEET *** phylogenetic analysis enabled us to categor-ize the predicted 15 SWEET proteins into four distinct *** observed slight variations in the exon‒intron structures of these genes,while the motifs and domain structures remained highly ***,the developmental and biological stress expression proﬁles of the 15 FvSWEET genes were extracted and ***,WGcNA coexpression network analysis was run to search for possible interacting genes of FvSWEET *** results showed that the FvSWEET10 genes interacted with 20 other genes,playing roles in response to bacterial and fungal *** outcomes of this study provide insights into the further study of FvSWEET genes and may also aid in the functional characterization of the FvSWEET genes in woodland strawberries.

关键词： Woodland strawberry SWEET gene sugar transporter genome-wide identiﬁcation characterization expression

Analysis of Gestational Diabetes Mellitus (GDM) and Its Impact on Maternal and Fetal Health: A comprehensive Dataset Study Using Data Analytic Tool Power BI

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Data Analysis and Information Processing 2024年第2期12卷 232-247页

作者： Shahistha Jabeen Hashim arthur McAdams Department of Technology Management University of Bridgeport Bridgeport USA

Gestational Diabetes Mellitus (GDM) is a significant health concern affecting pregnant women worldwide. It is characterized by elevated blood sugar levels during pregnancy and poses risks to both maternal and fetal health. Maternal complications of GDM include an increased risk of developing type 2 diabetes later in life, as well as hypertension and preeclampsia during pregnancy. Fetal complications may include macrosomia (large birth weight), birth injuries, and an increased risk of developing metabolic disorders later in life. Understanding the demographics, risk factors, and biomarkers associated with GDM is crucial for effective management and prevention strategies. This research aims to address these aspects comprehensively through the analysis of a dataset comprising 600 pregnant women. By exploring the demographics of the dataset and employing data modeling techniques, the study seeks to identify key risk factors associated with GDM. Moreover, by analyzing various biomarkers, the research aims to gain insights into the physiological mechanisms underlying GDM and its implications for maternal and fetal health. The significance of this research lies in its potential to inform clinical practice and public health policies related to GDM. By identifying demographic patterns and risk factors, healthcare providers can better tailor screening and intervention strategies for pregnant women at risk of GDM. Additionally, insights into biomarkers associated with GDM may contribute to the development of novel diagnostic tools and therapeutic approaches. Ultimately, by enhancing our understanding of GDM, this research aims to improve maternal and fetal outcomes and reduce the burden of this condition on healthcare systems and society. However, it’s important to acknowledge the limitations of the dataset used in this study. Further research utilizing larger and more diverse datasets, perhaps employing advanced data analysis techniques such as Power BI, is warranted to corro

关键词： Gestational Diabetes Visualization Data Analytics Data Modelling Pregnancy Power BI

Origin and age group of the fastest amateur triathletes competing in ‘Ironman Hawaii’ between 2003 and 2019

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Sports Medicine and Health Science 2024年第1期6卷 70-75页

作者： Paulo Puccinelli arthur Narloch Sacchelli Aldo Seffrin Beat Knechtle Katja Weiss Marilia Santos Andrade Department of Physiology Federal University of Sao PauloBrazil Federal University of Santa catarina Brazil Medbase St.Gallen Am Vadianplatz St.GallenSwitzerland Institute of Primary care University of ZurichZurichSwitzerland

Little is known about the prevalent nationalities among the best-placed athletes participating in“Ironman Hawaii.”Moreover,the age at which athletes achieve their best performances remains *** present study aimed to compare the prevalent nationalities among the athletes,their respective placement among the top five,and the performance difference between the different age groups in‘Ironman Hawaii’from 2003 to 2019.A total of 30354 amateur triathletes were selected from the Obsessed Triathlete(OBSTRI)website.A“TOP 5”division filter was applied for further analysis,resulting in 1851 athletes being included in this *** the male runners,Americans participated the most in Ironman events(39%),followed by Germans(10%).Among female runners,Americans participated the most(54%),followed by Australian runners(8%).Male Americans also featured most among the top five(30%),followed by Germans(16%).Female Americans were the most prevalent among the top five(47%),followed by Australian Americans(10%).There were no significant performance differences(p>0.05)between the 25–29 and 40–44 age groups for either *** 45–49 age group presented significantly worse performance than the 35–39 age group for both sexes(pcans were the most performant and frequent participants in“Ironman Hawaii.”The expected performance decline due to aging was observed after 45 years in both sexes.

关键词： Aging cycling Endurance Performance Running Swimming Triathlon

Effects of the level and source of dietary physically effective fiber on feed intake, nutrient utilization, heat energy, ruminal fermentation,and milk production by Alpine goats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Animal Nutrition 2024年第2期17卷 312-324页

作者： Raquel V.Lourencon Amlan K.Patra Luana P.S.Ribeiro Ryszard Puchala Wei Wang Terry A.Gipson arthur L.Goetsch American Institute for Goat Research Langston University

Thirty-two primiparous and 31 multiparous Alpine goats were used to determine influences of diets varying in level and source of forage on performance in early to mid-lactation for 16 wk. Diets consisted of 40%, 50%, 60%, and 70% forage(designated as 40F, 50F, 60F, and 70F, respectively) with 60F and 70F containing coarsely ground grass hay(primarily orchardgrass) and 40F and 50F containing cottonseed hulls, alfalfa pellets, and coarsely ground wheat hay. Diets contained 15.9% to 16.3% crude protein and37.8%, 42.1%, 53.5%, and 55.4% neutral detergent fiber(NDF) with 10.0%, 15.8%, 50.1%, and 55.5% particle retention on a 19-mm sieve, and 26.1%, 29.6%, 38.3%, and 40.0% physically effective NDF(pe NDF) for 40F,50F, 60F, and 70F, respectively. Dry matter intake(2.71, 2.75, 1.96, and 1.95 kg/d) and milk yield(2.82,2.71, 2.23, and 2.10 kg/d for 40F, 50F, 60F, and 70F, respectively) were lower(P c matter was similar among diets(P > 0.05), but digestibility of NDF was greater(P ctively). Diet affected(P concentrations(2.62%, 2.69%, 2.58%, and 2.52% for 40F, 50F, 60F, and 70F, respectively). Milk energy yield was greater(P cted(P > 0.05) by diet and was lower(P cetate proportion were greater for 60F and 70F than for the other diets and the proportion of butyrate was lower for the two diets highest in fiber. The mean lengths of time spent ruminating, eating, standing, and lying were not affected(P > 0.05) by diet or parity, but many interactions involving diet, period, hour, and parity were significant(P conclusion, lactational performance o

关键词： Physically effective fiber Alpine goat Lactation Ruminal fermentation Feeding behavior