检索结果-南通市图书馆

Asymptomatic bacteriuria in pregnancy in Port Harcourt

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2010年第7期3卷 580-583页

作者： Odigie JO Anugweje kc Department of Pharmacology and Toxicology College of Health SciencesUniversity of Port HarcourtPort Harcourt Nigeria

Objective:To determine the prevalence of asymptomatic bacteriuria in pregnancy,to consider the antimicrobial sensitivity patterns of involved uropathogens,to elucidate the safety profiles of antibacterial agents,and to evaluate the role of urinalysis in screening for asymptomatic ***:About 760 apparently healthy pregnant subjects attending the Antenatal Clinic of the University of Port Harcourt Teaching Hospital were randomly selected for this *** and microscopy,culture,and sensitivity tests were carried out on clean-catch midstream urine samples obtained from *** reagent strips were used for urinalysis while the standard wire loop and agar diffusion technique were respectively employed for culture and susceptibility ***:A total of 111 samples yielded moderate or severe growth on culture after 48 hours comprising 35,31,27,and 18 isolates of Staphylococcus spp.,Proteus spp.,Klebsiella spp.,and Escherichia spp,*** results were positive for the presence of nitrate reductase and leucocyte esterase activity in 17 urine samples of these 111 *** isolates showed a general sensitivity to the fluorinated quinolones and to ***:The prevalence of asymptomatic bacteriuria is 14.6%, with the predominant organism being Staphylococcus *** used for treatment should have excellent fetal safety profiles,and a rapid screening test with a high negative predictive value for asymptomatic bacteriuria would be ideal.

关键词： Asymptomatic bacteriuria Leucocyte esterase Nitrate reductase Screening tests

Cartan-Fubini type extension of holomorphic maps respecting varieties of minimal rational tangents

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

Science China Mathematics 2015年第3期58卷 513-518页

作者： hwang JunMuk Korea Institute for Advanced Study

A fundamental result in the theory of minimal rational curves on projective manifolds is Cartan- Fubini extension theorem proved by hwang and Mok, which describes the extensibility of biholomorphisms between connected open subsets of two Fano manifolds of Picard number 1 which preserve varieties of minimal rational tangents （VMRT）, under a mild geometric assumption on the second fundamental forms of VMRT＇s. Hong and Mok have developed Cartan-Fubini extension for non-equidimensional holomorphic immersions from a connected open subset of a Pano manifold of Picard number 1 into a uniruled projective manifold, under the assumptions that the map sends VMRT＇s onto linear sections of VMRT＇s and it satisfies a mild geometric condition formulated in terms of second fundamental forms on VMRT＇s. In the current paper, we give a generalization of Hong and Mok＇s result, under the same condition on second fundamental forms, assuming only that the holomorphic immersions send VMRT＇s to VMRT＇s. Our argument is different from Hong and Mok＇s and is based on the study of natural foliations on the total family of VMRT＇s. This gives a substantially simpler proof than Hong and Mok＇s argument.

关键词： varieties of minimal rational tangents extension of holomorphic maps

A multi-subwaveform parametric retracker of the radar satellite altimetric waveform and recovery of gravity anomalies over coastal oceans

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2010年第4期53卷 610-616页

作者： hwang CheinWay Department of Civil Engineering Chiao Tung University

The quality of satellite radar altimetric data is very important in studies of geodesy,geophysics,and *** coastal oceans,altimeter waveforms are contaminated by the terrain and physical environments so that the accuracy of altimeter data is lower than that over open *** we develop a new multi-subwaveform parametric retracker(MSPR) to improve the quality of altimeter data for the recovery of gravity anomaly in coastal *** least squares collocation method is used to recover the residual gravity anomaly over the coastal water from altimetric *** waveform data records from Geosat/GM around Taiwan Island are practically retracked with *** compared with the Taiwan geoid height,the results retracked by MSPR are more accurate than those retracked by the well-known β-5-parmeter method and from the geophysical data records(GDRs).The gravity anomalies over Taiwan coastal waters are calculated from the retracked altimeter data with the least squares *** we compared gravity anomalies computed using altimeter GDRs with the ship-borne gravity data over Taiwan coastal ocean,we found that the results from retracked data are more accurate than those from GDRs.

关键词： multi-subwaveform parametric retracker waveform retracking for radar satellite altimetry gravity anomaly least squares collocation Geosat/GM

Correlation of microstructure with tensile behavior and properties of API X70 pipeline steels subjected to strain aging

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2020年第3期27卷 319-324页

作者： Sang-in Lee Byoungchul hwang Department of Materials Science and Engineering Seoul National University of Science and TechnologySeoul 01811Republic of Korea

Variations in tensile behavior and properties after pre-strain and thermal aging were differently affected by strain aging phenomenon dependent on *** increasing polygonal ferrite fraction,decrement in uniform elongation is increased,and the increment in yield-to-tensile ratio is slightly decreased after pre-strain and thermal ***,it can be concluded that the polygonal ferrite has contradictory effects on strain aging resistance although the polygonal ferrite still contributes to improvement of uniform elongation after strain aging.

关键词： Steel Microstructure Strain aging Deformability Pipeline

L^(p) Boundedness of Fourier Integral Operators in the Class S_(0,0)

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

Acta Mathematica Sinica,English Series 2022年第9期38卷 1551-1596页

作者： Ing-Lung hwang Department of Mathematics "National Chung Cheng University of Taiwan"Chiayi County 621003China

We first prove the L~2-boundedness of a Fourier integral operator where it’s symbol a ∈S_(1/2,1/2)~0(R~n× R~n) and the phase function S is non-degenerate,satisfies certain conditions and may not be positively homogeneous in ξ-*** we use the above property,Paley’s inequality,covering lemma of Calderon and Zygmund etc.,and obtain the L~p-boundedness of Fourier integral operators if(1) the symbol a ∈ Λ_(k)^(m_(0)) and Supp a = E×R~n,with E a compact set of R~n(m_(0) =-|1/p-1/2|n,1n/2;2n/p),(2) the symbol a ∈ Λ_(0,k,k’)^(m_(0))(m_(0) =-|1/p-1/2|n,1n/2,k’>n/p;2n/p,k’>n/2) with the phase function S(x,ξ) = xξ + h(x,ξ),x,ξ ∈ R~n non-degenerate,satisfying certain conditions and ?ξ h ∈ S_(1,0)~0(R~n× R~n),or(3) the symbol a ∈ Λ_(0,k,k’)^(m_(0)),the requirements for m_(0),k,k’ are the same as in(2),and ?_(ξ)h is not in S_(1,0)~0(R~n× R~n) but the phase function S is non-degenerate,satisfies certain conditions and is positively homogeneous in ξ-variables.

关键词： Fourier integral operator L^(p)-boundedness

Performance Modeling and Analysis of Broadcast Packets in Vehicular Ad Hoc Networks

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2019年第2期28卷 211-223页

作者： Jaedeok Kim Ganguk hwang Artificial Intelligence Team Samsung Electronics Republic of Korea Department of Mathematical Sciences Korea Advanced Institute of Science and Technology Republic of Korea

In this paper;we analyze the performance of a broadcast packet in a VANET with the slotted ALOHA protocol where locations of vehicles are modeled by a one-dimensional Poisson point process. We consider the packet delivery probability under a broadcast delay constraint. Since the successful transmission of a broadcast packet is significantly affected by interferences at receivers which are spatially correlated,让 is important to capture the spatial correlations properly in order to obtain an accurate expression of the packet delivery probability in a VANET. However, the exact analysis of the spatial correlations in interference is not mathematically tractable. In this paper we provide an accurate approximation of the spatial correlations in interference and derive the packet delivery probability with the help of the approximation. Numerical and simulation results are provided to validate our analysis and to investigate the performance of a VANET.

关键词： Performance analysis VANEX broadcast packets

Energy saving with node sleep and power control mechanisms for wireless sensor networks

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

The Journal of China Universities of Posts and Telecommunications 2011年第1期18卷 49-59页

作者： WANG hwang-cheng National Engineering Laboratory for Next Generation Internet Interconnection Devices School of Electronics and Information EngineeringBeijing Jiaotong University

Energy efficiency sleep scheduling in wireless sensor networks is one of the most crucial technologies. In this paper, we propose a simple and feasible synchronous node sleeping and waking mechanisms for small scale wireless sensor networks. Sensor nodes are divided into forwarding nodes and listening nodes. Beacon frame containing sleep command from the coordinator can be forwarded to listening nodes via forwarding nodes. All the nodes in the network can enter sleep at about the same time. Through such network synchronization mechanisms, we can realize synchronous sleep and wake of the entire network. Furthermore, a new power control scheme based on routing protocol （PCBRP） in the medium access control （MAC） layer is proposed. It operates with the help of routing protocol and calculates optimal transmission power according to the distance between neighbor nodes. A mapping table including optimal transmission power and node address is established during the route building procedure. The transmission power can be obtained by searching the table with the address of next-hop neighbor in subsequent data transmissions. The proposed mechanisms are implemented in sensor nodes and are evaluated in a test-bed. The analysis and evaluation based on the experimental results confirm that the proposed energy-saving mechanisms are feasible and effective.

关键词： wireless sensor network energy-saving mechanism synchronous sleep and wake power control micro sensor routing protocol

Bee Venom Acupuncture Induced Skin Patch Discoloration Persisting for More than 3 Years:A Case Report

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2021年第10期27卷 774-777页

作者： Ji Hye hwang Department of Acupuncture&Moxibustion Medicine College of Korean MedicineGachon UniversitySeongnam(13120)Republic of Korea

Bee venom(BV),one of the most commonly encountered types of animal venom,consists of a mixture of chemical agents that cause allergic reactions in the human body.⑴BV therapy,in which BV is exploited for medicinal purposes,is available worldwide,mainly used in Asia,Eastern Europe,and South America.(2)BV therapy has been applied to treat a diverse set of diseases including various musculoskeletal conditions such as arthritis and rheumatism,arthralgia,chronic recalcitrant neuralgia,(3-5)Parkinson's disease,(6,7)postherpetic neuralgia,(8)and morphea.(9)Although the therapeutic utility of BV has been demonstrated,extensive studies regarding the safety of BV as a therapeutic agent have identified potential side effects,ranging from minor skin reactions that typically resolve over several days to severe life-threatening immune responses such as anaphylaxis.

关键词： Acupuncture diseases Bee

Size effect in plastically deformed passivated thin films

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2009年第9期52卷 1375-1381页

作者： hwang Keh-Chih AML Department of Engineering Mechanics Tsinghua University

The flow theory of mechanism-based strain gradient plasticity theory (MSG) developed by Qiu et al. (2003) is extended for incompressible material. The MSG flow theory is used to predict the increase of plastic work hardening for plane strain tension of surface-passivated Cu thin film. The theoretical predictions agree well with experiments for suitably chosen material parameters.

关键词： MSG theory strain gradient plasticity passivation thin film plain strain tension