检索结果-南通市图书馆

Travel of a mis-swallowed long spoon to the jejunum

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2009年第39期15卷 4984-4985页

作者： Yan Song Hua guo Jian-Yong Wu Kidney Disease Center the First Affiliated Hospital College of Medicine Zhejiang University Hangzhou 310003 Zhejiang Province China Department of Gastroenterological Surgery the First Affiliated Hospital College of Medicine Zhejiang University Hangzhou 310003 Zhejiang Province China

Foreign-body ingestion is a relatively common presentation at emergency departments,but long metallic spoon swallowing is an infrequent *** most cases of foreign-body ingestion,there have been no reported cases of long foreign bodies reaching the *** report a rare case of a coffee spoon that was swallowed accidentally and passed through the pylorus and duodenal loop and reached the jejunum,with no complications.

关键词： Spoon Foreign body Jejunum

Theoretical study on the 1s^22s-1s^2np transitions for Ni25^＋ion

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

Frontiers of physics 2012年第2期7卷 252-255页

作者： Zhi-wen Wang (1) Yang guo (1) College of Physics and Electronic Technology Liaoning Normal University Dalian China

The transition energies, wavelengths and oscillator strengths for the ls22s-ls2np （n≤9） transitions of Ni25＋ ion are calculated. In calculation of the energies, we not only take account of the first- order corrections from relativistic and mass-polarization effects, but also estimate the higher-order relativistic contribution and QED correction by introducing the effective nuclear charge. The results agree with experimental data available in literature satisfactorily. Grotrian diagram showing these transitions is given.

关键词： Ni^25+ ion higher-order relativistic contribution and QED corrections Grotrian dia-gram oscillator strength

Synthesis and aggregation properties of amphiphilic mono and bisadducts of fullerene in aqueous solution

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

Chinese Chemical Letters 2008年第9期19卷 1039-1042页

作者： Pu Zhanga Zhi Xin guo Shuang Lv Department of Chemistry Renmin University of China Beijing 100872 China Department of Chemistry Beijing Institute of Technology Beijing 100081 China

New amphiphilic[60]fullerene monoadduct TPF and bisadducts BTPF were synthesized and well-characterized. Their aggregation properties in aqueous solution was investigated by UV-vis and TEM methods. In aqueous solution, monoadduct TPF forms irregularly shaped and some rod-like aggregates, whereas bisadducts BTPF gives sphadcal aggregates with diameters of 50-150 rim. It indicated that the aggregation properties of amphiphilic fullerene derivatives depend on the number of hydrophilic

关键词： Fullerene Aggregation Amphiphilic

Toward Energy-Efficiency Optimization of Pktgen-DPDK for Green Network Testbeds

在线全文

学校读者我要写书评

暂无评论

China Communications 2018年第11期15卷 199-207页

作者： guo Li Dafang Zhang Yanbiao Li Keqin Li College of Computer Science and Electronic Engineering Hunan University Department of Computer Science State University of New York

The packet generator （pktgen） is a fundamental module of the majority of soft- ware testers used to benchmark network pro- tocols and functions. The high performance of the pktgen is an important feature of Future Internet Testbeds, and DPDK is a network packet accelerated platform, so we can use DPDK to improve performance. Meanwhile, green computing is advocated for in the fu- ture of the internet. Most existing efforts have contributed to improving either performance or accuracy. We, however, shifted the focus to energy-efficiency. We find that high per- formance comes at the cost of high energy consumption. Therefore, we started from a widely used high performance schema, deeply studying the multi-core platform, especially in terms of parallelism, core allocation, and fre- quency controlling. On this basis, we proposed an AFfinity-oriented Fine-grained CONtrolling （AFFCON） mechanism in order to improve energy efficiency with desirable performance. As clearly demonstrated through a series of evaluative experiments, our proposal can reduce CPU power consumption by up to 11% while maintaining throughput at the line rate.

关键词： CPU affinity DPDK energy-effi-cient NUMA packet generator

Revisiting the security of quantum dialogue and bidirectional quantum secure direct communication

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2008年第5期51卷 559-566页

作者： GAO Fei guo FenZhuo WEN QiaoYan ZHU FuChen State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Tele-communicationsBeijing 100876China School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China National Laboratory for Modern Communications Chengdu 610041China

From the perspective of information theory and cryptography,the security of two quantum dialogue protocols and a bidirectional quantum secure direct communi-cation(QSDC) protocol was analyzed,and it was pointed out that the transmitted information would be partly leaked out in *** is,any eavesdropper can elicit some information about the secrets from the public annunciations of the legal *** phenomenon should have been strictly forbidden in a quantum secure *** fact,this problem exists in quite a few recent proposals and,therefore,it deserves more research attention in the following related study.

关键词： quantum secure direct communication quantum dialogue quantum cryptography cryptanalysis

New Approach to Differential Equations with Countable Impulses

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2011年第2期27卷 255-262页

作者： Hong-Kun Zhang Jin-guo Lian Jiong Sun Department of Mathematics and Statistics University of Massachusetts Amherst MA 01003 USA Department of Mathematics Inner Mongolia University Hohhot Inner Mongolia 010021 China

This paper provides a new approach to study the solutions of a class of generalized Jazobi equations associated with the linearization of certain singular flows on Riemannian manifolds with dimension n ＋ 1. A new class of generalized differential operators is defined. We investigate the kernel of the corresponding maximal operators by applying operator theory. It is shown that all nontrivial solutions to the generalized Jacobi equation are hyperbolic, in which there are n dimension solutions with exponential-decaying amplitude.

关键词： countable impulses differential operator hyperbolic Jacobi fields hyperbolicity differential operators

Role of confinement in water solidification under electric fields

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2015年第5期10卷 59-67页

作者： guo-Xi Nie Yu Wang Ji-Ping Huang Department of Physics State Key Laboratory of Surface Physics and Collaborative Innovation Center of Advanced Microstructures Fudan University Shanghai 200433 China Department of Physics Zhejiang Agriculture and Forestry University Hangzhou 311300 China Department of Physics State Key Laboratory of Surface Physics and Collaborative Innovation Center of Advanced Microstructures Fudan University Shanghai 200433 China

In contrast to the common belief that confinement promotes water solidification, here we show by molecular dynamics simulations that confinement can impede water solidification under electric fields. The behavior is evidenced by the increase in critical electric field strength for water solidifi- cation as the confinement progresses. We also show that the solidification occurs more easily with a parallel field than a perpendicular one. We understand and generalize these results by developing an energy theory incorporated with the anisotropic Clausius-Mossotti equation. It is revealed that the underlying mechanism lies in the confinement effect on molecules＇ electro-orientations. Thus, it be- comes possible to achieve electro-freezing （i.e., room-temperature ice） by choosing both confinement and electric fields appropriately.

关键词： molecular dynamics simulations water electric fields confinement

Facile Oxygen-promoted Synthesis of Cu,N Co-doped Carbon Composites for Oxygen Reduction

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2021年第6期36卷 796-803页

作者： LIU Qianqian guo Wei PAN Mu TU Wenmao Hubei Key Laboratory of Fuel Cell Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

A new strategy to fabricate oxygen-promoted Cu,N co-doped carbon(OP-CuN@C)composites is *** strategy consists of only two simple steps:chemical polymerization and high temperature *** measurements were conducted to investigate the catalytic activity and mechanism of ORR on the resulting *** the electrochemical results indicate that OP-CuN@C exhibits the best ORR catalytic *** ORR onset potential of OP-CuN@C is slightly lower than that of commercial Pt/C *** good performance is attributed to the large specific surface area,high content of heteroatoms(pyridinic,graphitic nitrogen,and oxygen atom)and synergistic effect between divalent copper and nitrogen dopant.

关键词： oxygen reduction reaction oxygen promotion OP-CuN@C chemical polymerization approach high temperature carbonized method

Dependences of longleaf pine(Pinus palustris) natural reproduction on environments above ground

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2014年第3期25卷 565-570页

作者： Qiuju guo Dexiang Wang Xunru Ai Lan Yao College of Forestry and Horticulture Hubei University for Nationalities College of Forestry Northwest A&F University

We studied relations between natural seedling reproduction and above ground environment in a longleaf pine ecosystem. Forty-eight 0.05 ha circular plots were sampled under single-tree selection, group-tree selection and control stands in three main longleaf pine areas in south Alabama, USA. We measured six above-ground environment factors, viz. canopy closure, stand density, basal area, average tree height, understory cover and PAR under canopy. We employed forward, back-ward and stepwise selection regression to produce one model. Three main variables：canopy closure, stand density and basal area, were left in the model; light, PAR and understory cover were not incorporated into the model at the 0.10 significance level. Basal area was a positive pa-rameter, while canopy closure and stand density were negative parame-ters. Canopy closure was the main parameter in the model. The model proved to be meaningful, and has potential to provide useful guidance for future work.

关键词： seedling reproduction number selection regression analysis model