检索结果-南通市图书馆

New observable for measuring the CP property of top-Higgs interaction

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2021年第2期45卷 319-325页

作者： Qing-Hong Cao ke-pan Xie Hao Zhang Rui Zhang Department of Physics and State key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Center for High Energy Physics Peking UniversityBeijing 100871China Center for Theoretical Physics Department of Physics and AstronomySeoul National UniversitySeoul 08826Korea Theoretical Physics Division Institute of High Energy PhysicsBeijing 100049China School of Physics University of Chinese Academy of ScienceBeijing 100049China

We propose a new dihedral angle observable for measuring the CP property of the interaction between the top quark and Higgs boson int\bar{t}Hproduction at the 14 TeV Large Hadron Collider(LHC).We consider two decay modes of the Higgs boson,H→to b\b and H→γγ,and demonstrate that the dihedral angle distribution is able to distinguish between the CP-even and the CP-odd hypothesis at a 95%confidence level,with an integrated luminosity of\sim 180fb^(-1).

关键词： Higgs top-quark Yukawa interaction

Spatiotemporal variations of nitrate sources and dynamics in a typical agricultural riverine system under monsoon climate

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第7期32卷 98-108页

作者： Hao Jiang Wenjing Liu Jiangyi Zhang Li Zhou Xiaode Zhou ke pan Tong Zhao Yuchen Wang Zhifang Xu Institute for Advanced Study Shenzhen UniversityShenzhen518060China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China CAS Center for Excellence in Life and Paleoenvironment Beijing 100044China University of Chinese Academy of Sciences Beijing 100049China State key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China

Nitrogen pollution is a serious environmental issue in the Danjiangkou Reservoir region(DRR),the water source of the South-to-North Water Diversion Project of *** this research,seasonal surveys and a bi-weekly time series survey were conducted in the Qihe River Basin,one of the most densely populated agricultural basins in the *** compositions(NO3^-Cl^-),dual isotopes(δD-H2O,δ^18O-H2O,δ^15N-NO3^-,andδ^18O-NO3^-),and a Markov Chain Monte Carlo isotope mixing model were jointly applied to unravel the sources,migrations,and transformations of the nitrate(NO3^-)in the *** was revealed that the mixing between different sources was the main process controlling the isotopic compositions of the riverine NO3the upper-middle *** contrast,denitrification occurred in the lower *** the first time,the sources of NO3^-quantified at a basin scale in the ***,the river transported 484.2 tons/year of NO3^-N to the reservoir,of which 32.6%,36.4%,28.0%,and 3.0%was from soil organic nitrogen,chemical fertilizer,residential sewage and atmospheric precipitation,*** NO3^-N fluxes of the different sources were regulated by the monsoon climate and anthropogenic *** example,high precipitation and intense fertilization resulted in severe nonpoint source *** thrived in soils and reservoirs in wet *** could regulate the migration,nitrification and denitrification *** on the results,we suggest that the management strategies dealing with nitrogen pollution issue in the DRR should follow the specific spatiotemporal characteristics of NO3migration and transformation mechanisms.

关键词： Nitrate Source Dynamics Isotope MCMC mixing model

High-Efficient Numeric Simulation of Spontaneous Potential Log in Complex Beds

在线全文

学校读者我要写书评

暂无评论

石油地球物理勘探 2009年第3期44卷 118-124页

作者： pan ke-jia Tan Yong-ji School of Mathematical Sciences and Computing Technology Central South University Changsha 410075 China School of Mathematical Sciences Fudan University Shanghai 200433 China

自然电位测井是石油勘探中探测地层物理参数的重要手段.针对近年来出现的侵入带电阻率渐变和水淹层等复杂地层模型,本文建立了基于连续侵入的自然电位测井的数学模型,提出了一种捕捉交界面电位跳跃的有限差分方法.该方法非常简单,易于... 详细信息

自然电位测井是石油勘探中探测地层物理参数的重要手段.针对近年来出现的侵入带电阻率渐变和水淹层等复杂地层模型,本文建立了基于连续侵入的自然电位测井的数学模型,提出了一种捕捉交界面电位跳跃的有限差分方法.该方法非常简单,易于计算机编程实现.利用该方法定量分析了目的层电阻率、地层厚度、井径、侵入带和水淹层等因素对自然电位测井响应的影响,取得了满意的结果.复杂地层自然电位测井数值模拟的实现为测井解释提供了依据,对实际测井工程具有一定的指导意义.

关键词：自然电位数值模拟登录水电阻率有限差分法计算机编程物理参数石油勘探

Bile Acid Overload Induced by Bile Duct and Portal Vein Ligation Improves Survival after Staged Hepatectomy in Rats

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2023年第5期43卷 1013-1022页

作者： Xin-lan GE Xuan ZHANG Chong-hui LI ke pan Lei HE Wei-zheng REN Faculty of Hepato-pancreato-Biliary Surgery First Medical CenterChinese PLA General HospitalBeijing 100853China Institute of Hepatobiliary Surgery of Chinese PLA Beijing 100853China Ren key Laboratory of Digital Hepatobiliary Surgery PLABeijing 100853China

Objective Compared to portal vein ligation(PVL),simultaneous bile duct and portal vein ligation(BPL)can significantly enhance hypertrophy of the intact *** study aimed to investigate whether BPL could improve survival after extended hepatectomy independently of an increased remnant *** We adopted rat models of 90%BPL or 90%*** investigate the role of bile acids(BAs)the BA pools in the PVL and BPL groups were altered by the *** resection preserving 10%of the estimated liver weight was performed 3 days after BPL;PVL;or sham ***,canalicular network(CN)continuity;and hepatocyte polarity were *** At 3 days after BPL;PVL;or sham operation when the volumetric difference of the intended liver remained insignificant,the survival rates after extended hepatectomy were 86.7%,47%,and 23.3%,respectively(P<0.01).BPL induced faster restoration of canalicular integrity along with an intensive but transient BA *** hepatectomy after BPL shortened the duration of the bile CN disturbance and limited BA *** the BA pools in the rats that underwent BPL could compromise these effects,whereas increasing the BA pools of rats that underwent PVL could induce similar *** changes in CN restoration were associated with activation of *** In addition to increasing the future remnant liver,BPL shortened the duration of the spatial disturbance of the CN and could significantly improve the tolerance of the hypertrophied liver to staged *** may be a safe and efficient future option for patients with an insufficient remnant liver.

关键词： bile canalicular network hepatocyte polarization liver regeneration portal vein ligation simultaneous bile duct and portal vein ligation

Genetic Diversity of Maize Populations Developed by Two Kinds of Recurrent Selection Methods Investigated with SSR Markers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2008年第9期7卷 1037-1045页

作者： LI Lu-jiang YANG ke-cheng pan Guang-tang RONG Ting-zhao Maize Research Institute Sichuan Agricultural University~Key Laboratory of Crop Genetic Resources and Improvement Ministry of Education Ya＇ an 625014 P.R.China

Two cycles of biparental mass selection （MS） and one cycle of half-sib-S3 family combining selection （HS-S3） for yield were carried out in 2 synthetic maize populations P4C0 and P5C0 synchronously. The genetic diversity of 8 maize populations, including both the basic populations and their developed populations, were evaluated by 30 SSR primers. On the 30 SSR loci, a total of 184 alleles had been detected in these populations. At each locus, the number of alleles varied from 2 to 14, with an average of 6.13. The number and ratio of polymorphic loci in both the basic populations were higher than those of their developed populations, respectively. There was nearly no difference after MS but decreased after HS-S3 in both the basic populations in the mean gene heterozygosity. The mean genetic distance changed slightly after MS but decreased in a bigger degree after HS-S3 in both the basic populations. Analyses on the distribution of genetic distances showed that the ranges of the genetic distance were wider after MS and most of the genetic distances in populations developed by HS-S3 were smaller than those in both the basic populations. The number of genotypes increased after MS but decreased after HS-S3 in both the basic populations. The genetic diversity of intra-population was much more than genetic diversity of inter-population in both the basic populations. All these indexes demonstrated that the genetic diversity of populations after MS was similar to their basic populations, and the genetic diversity was maintained during MS, whereas the genetic diversity of populations decreased after HS-S3. This result indicated that heterogeneity between some of the individuals in the developed populations increased after MS, whereas the populations become more homozygotic after HS-S3.

关键词： maize recurrent selection genetic diversity SSR markers biparental mass selection (MS) half-sib-S3 familycombining selection (HS-S3)

Bedside ultrasound-guided water injection assists endoscopically treatment in esophageal perforation caused by foreign bodies: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2023年第6期15卷 1240-1246页

作者： Hua-Xing Wei Song-Yong Lv Bin Xia Kai Zhang Chen-ke pan Department of Ultrasound The Fourth Affiliated Hospital of Zhejiang University College of MedicineYiwu 322200Zhejiang ProvinceChina Department of Ultrasound Jinyun County People’s HospitalLishui 321400Zhejiang ProvinceChina

BACKGROUND Fishbone migration from the esophagus to the neck is relatively uncommon in clinical *** complications secondary to esophageal perforation after ingestion of a fishbone have been described in the ***,a fishbone is detected and diagnosed by imaging examination and is usually removed by a neck *** SUMMARY Herein,we report a case of a 76-year-old patient with a fishbone in the neck that had migrated from the esophagus and that was in close proximity to the common carotid artery,and the patient experienced *** endoscopically-guided neck incision was made over the insertion point in the esophagus,but the surgery failed due to having a blurred image at the insertion site during the *** injection of normal saline laterally to the fishbone in the neck under ultrasound guidance,the purulent fluid outflowed to the piriform recess along the sinus *** endoscopic guidance,the position of the fish bone was precisely located along the direction of liquid outflow,the sinus tract was separated,and the fish bone was *** the best of our knowledge,this is the first case report describing bedside ultrasound-guided water injection positioning combined with endoscopy in the treatment of a cervical esophageal perforation with an *** In conclusion,the fishbone could be located by the water injection method under the guidance of ultrasound and could be accurately located along the outflow direction of the purulent fluid of the sinus by the endoscope and was removed by incising the *** method can be a nonoperative treatment option for foreign body-induced esophageal perforation.

关键词： Esophageal perforation Foreign body removal Fishbone Beside ultrasound-guided Endoscopy Case report

Improved crop protection and biodiversity of the agroecosystem by reduced tillage in rice paddy ffelds in southern China

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 Agriculture 2022年第8期21卷 2345-2356页

作者： LU Qi-qi SONG Yuan-feng pan ke-qing LI Yun TANG Ming-xin ZHONG Guo-hua LIU Jie key Laboratory of Crop Integrated Pest Management in South China Ministry of Agriculture and Rural Affairs/Key Laboratory of Natural Pesticide and Chemical BiologyMinistry of Education/South China Agricultural UniversityGuangzhou 510640P.R.China

Agricultural sustainability has benefited from the broad adoption of conservation agriculture(CA)practices for decades,in which the reduction of mechanical disturbances to soil(also known as reduced tillage,RT)is one of the most essential principles for CA *** studies have recommended the advantages of CA practices in the promotion of biodiversity,but the integrated impacts on crop productivity and biodiversity remain *** CA has been applied in rice production in the subtropical area of southern China for several years,the effects of CA,particularly the RT methods,need to be evaluated for the local and long-term *** this study,we established an integrated network to illustrate how the reduction of tillage intensity influenced organisms including invertebrates(such as rice pests and their predators),pathogens and weeds,and then led to an impact on rice *** two-year study demonstrated that major rice pests,such as rice planthoppers,stem borers and apple snails,were effectively controlled by RT ***,the occurrence of common diseases declined with less *** to the conventional tillage(CT)treatment,the density of weeds in paddy fields deceased significantly in the RT *** addition,the diversity and richness of pest predators increased remarkably in paddy fields where either reduced or no tillage was applied,which highlighted the significance of a CA strategy for the promotion of biodiversity in the *** importantly,the rice yield gradually increased after the two-year reduction of *** together,our results suggest that the reduction of tillage intensity is beneficial for the protection of rice crops from various pests,and facilitates the sustainability of the agroecosystem and rice yield,which provides a solid basis and novel insights for the establishment of sustainable agroecosystems by CA-related practices in rice production in southern China.

关键词： conservation agriculture reduced tillage biodiversity pest control sustainable agriculture

Multiple Resonance Thermally Activated Delayed Fluorescence Sensitizers Enable Green-toUltraviolet Photon Upconversion:Application in Photochemical Transformations

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2022年第12期4卷 3852-3863页

作者： Yaxiong Wei ke pan Xiaosong Cao Yuanming Li Xiaoguo Zhou Chuluo Yang Shenzhen key Laboratory of Polymer Science and Technology College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060 School of Physics and Electronic Information Anhui Normal UniversityWuhuAnhui 241000 Department of Chemical Physics University of Science and Technology of ChinaHefeiAnhui 230026

Efficient visible-to-ultraviolet(UV)triplet-triplet annihilation upconversion(TTA-UC)with large anti-Stokes shift is highly promising for solar-powered and indoor ***,the excitationwavelengthis confined to the blue region(kes shift up to 1.05 eV,upconversion quantum yield up to 8.6%,and threshold excitation intensity as low as 9.2 mW cm^(−2) in *** TTA-UC pairs were applied as internal or external sources of UV photons to trigger energy-demanding photopolymerization and photoligation reactions even under excitation of low-power-density green light-emitting diode light,revealing the broad utility of thesemolecular *** work unlocks the huge potential of MR-TADF-type sensitizers in upconversion applications.

关键词： triplet-triplet annihilation upconversion visible-to-ultraviolet upconversion multiple resonance photochemical reactions

Differences in taste characteristics and antioxidant properties of four substitute teas based on a targeted metabolomics approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Beverage Plant Research 2023年第1期3卷 312-321页

作者： Zhongying Liu Qiansong Ran Congjun Yuan Shimao Fang ke pan Lin Long Guizhou Tea Research Institute Guiyang 550006China Guizhou Agricultural Vocational College Qingzhen 551400China Guizhou Academy of Forestry Science Guiyang 550011China Guizhou Guitianxia Tea Group Co.LTD Guiyang 550001China

To investigate the differences in taste characteristics and antioxidant properties of four types of tea *** sensory review and electronic tongue indicated that the taste characteristics of the four substitute teas were sweetness,bitterness and *** were a total of 136 flavonoid metabolites in 12 categories and 12 sugar metabolites were identified in the four substitute teas with ultra-performance liquid chromatography tandem-mass spectrometry metabolomics targeted *** were significantly positively correlated with antioxidant properties,among them,15 were positively associated with clearing ABTS radicals and five were positively associated with clearing DPPH radicals,and sugars were significantly negatively correlated with antioxidant *** antioxidant properties were in the following order:TC>KD>LY>*** conclusion is that significant differences in the content of flavonoids and sugar metabolites are the main reasons for the formation of the flavour characteristics and antioxidant differences of the four substitute teas.

关键词： targeted sugar substitute