检索结果-南通市图书馆

Lithium Salt of NH_2-substituted Graphene Nanoribbon with Twofold Donor-acceptor Framework: Large Nonlinear Optical Property

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2011年第3期27卷 512-515页

作者： SUN Chia-chung State Key Laboratory of Theoretical and Computational Chemistry Institute of Theoretical Chemistry Jilin University

Based on graphene, a new class of second-order nonlinear optical（NLO） material, the lithium salt of NH2-substituted graphene nanoribbon with the twofold donor（D）/acceptor（A） mode, was reported. Eight stable 2Li-2NH2-GNR lithium salts, especially cis lithium salts, display considerably large β0 values. The combination of NH2-substituting and cis Li-doping makes β0 greatly increased from 0（GNR） to 1.2×105―2.9×105 a.u.（cis-2Li- 2NH2-GNRs）. Our largest β0 value（2.9×105 a.u.） for cis-2Li-1,3-2NH2-AGNR is comparable to the record value of 1.7×105 a.u. for a long donor-acceptor polyene.

关键词： First hyperpolarizability Nonlinear optical material Twofold donor-acceptor mode

Discovery of Middle Jurassic palaeontinids from Inner Mongolia, China (Homoptera: Palaeontinidae)

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第1期17卷 112-116页

作者： SHIH chung Kun China College of Life Science Capital Normal University Beijing 100037

A new genus and three new species of fossil Palaeontinidae, Papilioncossus conchatus sp. nov., P. giganteus sp. nov. and P. pteroideus sp. nov., are described. All of them were collected from Middle Jurassic Jiulongshan Formation in Inner Mongolia, China. Based on distal part of forewing broader and longer than basal and Sc usually with branches, the new taxa are attributed to Palaeontinidae of Homoptera and compared with genus Pseudocossus. A key to species of Papilioncossus gen. nov. is provided. All type specimens are deposited in the Capital Normal University.

关键词： Palaeontinidae fossil Middle Jurassic new genus new species Inner Mongolia.

SHP gains citizenship of the AMPK kingdom

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2011年第6期8卷 450-452页

作者： Hun-Taeg chung School of Biological Sciences University of UlsanMetaInflammation Basic Research LaboratoryUlsanKorea

Various cytokines and chemokines are produced as a result of signaling through innate immune *** signaling is initiated by host–pathogen interactions in which the host’s germline-encoded pattern recognition receptors,including Toll-like receptors(TLRs),recognize conserved microbial structures termed pathogen-associated molecular *** are broadly distributed in immune cells and are responsible for eliciting innate responses and enhancing adaptive immunity to *** 12 members of the TLR family in mammals are characterized by an extracelluar leucine-rich repeat domain and an intracellular Toll/IL-1 receptor domain.

关键词： immunity cytokines initiated

Regional trauma system development in Shenzhen,China:an 8-year journey

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

Military Medical Research 2022年第3期9卷 385-386页

作者： Gui-Xi Zhang Gilberto Ka Kit Leung chung Mau Lo Richard kwong-Yin Lo John Wong Ronald V. Maier Eileen M.Bulger Joe King Man Fan Xiao-Bing Fu Chinese PLA Medical School Beijing100853China University of Hong Kong-Shenzhen Hospital Shenzhen518000China Faculty of Medicine University of Hong Kong Li Ka ShingHong Kong999077China Harborview Medical Center SeattleWA98195USA Medical Innovation Research Department and 4th Medical Center Chinese PLA General Hospital and Chinese PLA Medical SchoolBeijing100853China

Dear Editor,Since the late 1980s, trauma in China has been identified as a major public health challenge, with trafic-related fatalities accounting for 80% of accidental deaths[1]. In 2019, Shenzhen had a total population of approximately 20 million, and from 2010 to 2017, both emergency medical services and the total number of trauma patients increased, with trauma accounting for 47.0% and 38.4% of all patients in 2010 and 2017, respectively[2,3]. This report describes the efforts to implement programs and establish a trauma system in Shenzhen, China.

关键词： system services accounting

Characterization of Springtime Coliform Populations at the End Creek Wetland Restoration (Union Co., Oregon, USA): A Three-Year Study

在线全文

学校读者我要写书评

暂无评论

Natural Resources 2015年第8期6卷 482-490页

作者： Joseph A. Corsini Larry Rob Peters Brian Tarpy chung pak Karen Antell Eastern Oregon University La Grande USA Aquinas College Grand Rapids USA

In 2005, a 550-acre tract of agricultural land containing two small streams near La Grande, Oregon was registered in the U.S. Federal Wetlands Reserve Program. This designation was part of a plan to reclaim and restore the wetland to its natural state. Initial efforts at the End Creek Restoration Project restored both End Creek and South Fork Willow Creek to a natural course through rechanneling, and several plantings had restored some of the native flora. Since its establishment, the End Creek streams and floodplain have become a reserve for summer steelhead (Oncorhynchus mykiss), a threatened anadromous salmonid, and many migratory birds. The threatened Columbia Spotted Frog has also established itself in some of the ponds. As part of an effort to establish a baseline for water quality, we monitored total springtime coliform and fecal coliform bacteria in three of the End Creek ponds for three years. The results of this study indicate that, throughout any given spring, the numbers of both coliform and fecal coliform bacteria can fluctuate markedly among ponds on any given day, and that in any particular pond the numbers fluctuate from week to week. In addition, our analysis suggests that in early spring, the numbers of these organisms also fluctuate from year to year. The causes of these fluctuations are not well understood, but are expected to reflect both springtime flooding and the migrations of source animals such as waterfowl and cervids. Information gathered from this study will help inform future management activities on the wetland.

关键词： Coliform Fecal Coliform End Creek Wetland Restoration

Nondriven Polymer Translocation Through a Nanopore: Scaling for Translocation Time with Chain Length

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

Chemical Research in Chinese Universities 2011年第6期27卷 1023-1026页

作者： SUN Chia-chung State Key Laboratory of Theoretical and Computational Chemistry Institute of Theoretical Chemistry Jilin University

We investigated the dynamics of the passage for a polymer chain through a nanopore in the absence of any external driving force with Weeks-Chandler-Andersen potential in two-dimensional simulations, in particular, focused our attention on the scaling law of the mean translocation time. We found that the effect of hydrodynamic interactions is the major factor in determining the scaling exponents with increasing pore size. The scaling close to N1＋2v was observed when the hydrodynamic interactions were screened in the cases of small pore sizes, while the scaling close to N3v was obtained when the hydrodynamic interactions were present in the cases of large pore sizes.

关键词： Translocation Nondriven Hydrodynamic interaction

Testicular sperm extraction and intracytoplasmic sperm injection in non obstructive azoospermia

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2000年第3期 54-58页

作者： Ng Hung Yu Ernest, Lau Yee Lan, Yeung Shu Biu, So Wai Ki, Tam Po Chor and Ho pak chung

Objective To report the experience in sperm extraction from testicular biopsies (TESE) performed from March 1996 to July 1998 in men with non obstructive azoospermia (NOA) Methods Comparisons of age, volume of both testes, serum FSH and testosterone in men, and histology of testicular samples in the first cycles between cycles with spermatozoa found and those without spermatozoa found were performed Comparisons of fertilization, cleavage and pregnancy rates between cycles with spermatozoa injected and those with spermatids injected were performed Results Spermatozoa were found in only 12 out of 26 first TESE cycles (46 2%) and other cycles had spermatids (round cells) only Age of men, history of mumps orchitis/oligozoospermia, volume of both testes and serum FSH/testosterone levels in men were not significantly different between cycles with and without spermatozoa The fertilization rate was significantly higher in cycles with spermatozoa injected than those with round cell injections (63 3% vs 23 2%, P <0 0001, Chi squared test) The pregnancy rate was 14 3% per cycle when spermatozoa were injected Conclusions TESE followed by Intracytoplasmic sperm injection (ICSI) is an effective treatment in patients with NOA Less than half of the patients undergoing TESE had spermatozoa recovered Age of men, volume of both testes and serum FSH/ testosterone levels in men were not useful in predicting successful recovery Compared to using ejaculated and epididymal spermatozoa, fertilization and pregnancy rates were achieved when testicular spermatozoa were used for ICSI

关键词： Intracytoplasmic sperm injection · non obstructive azoospermia · testicular sperm extraction

The geometry of the moduli space of one-dimensional sheaves

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2015年第3期58卷 487-500页

作者： CHOI Jinwon chung Kiryong School of Mathematics Korea Institute for Advanced Study

Let Md be the moduli space of stable sheaves on P2with Hilbert polynomial dm+*** this paper,we determine the effective and the nef cone of the space Md by natural geometric *** idea is to use the wall-crossing on the space of Bridgeland stability conditions and to compute the intersection numbers of divisors with curves by using the Grothendieck-Riemann-Roch *** also present the stable base locus decomposition of the space *** a byproduct,we obtain the Betti numbers of the moduli spaces,which confirm the prediction in physics.

关键词： effective cone nef cone birational morphism determinant line bundle Bridgeland wall-crossing

Iterative Semi-Supervised Learning Using Softmax Probability

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第9期72卷 5607-5628页

作者： Heewon chung Jinseok Lee Department of Biomedical Engineering College of Electronics and InformationKyung Hee UniversityYongin-siGyeonggi-do17104Korea

For the classification problem in practice,one of the challenging issues is to obtain enough labeled data for ***,even if such labeled data has been sufficiently accumulated,most datasets often exhibit long-tailed distribution with heavy class imbalance,which results in a biased model towards a majority *** alleviate such class imbalance,semisupervised learning methods using additional unlabeled data have been ***,as a matter of course,the accuracy is much lower than that from supervised *** this study,under the assumption that additional unlabeled data is available,we propose the iterative semi-supervised learning algorithms,which iteratively correct the labeling of the extra unlabeled data based on softmax *** results show that the proposed algorithms provide the accuracy as high as that from the supervised *** validate the proposed algorithms,we tested on the two scenarios:with the balanced unlabeled dataset and with the imbalanced unlabeled *** both scenarios,our proposed semi-supervised learning algorithms provided higher accuracy than previous *** is available at https://***/Heewonchung92/iterative-semi-learning.

关键词： Semi-supervised learning class imbalance iterative learning unlabeled data