检索结果-南通市图书馆

Anisotropy of the apparent resistivity variation rate near the epicentral region for strong earthquakes

在线全文

学校读者我要写书评

暂无评论

Acta Seismologica Sinica(English Edition) 2001年第3期14卷 303-314页

作者： DU xue-bin 1. Lanzhou Institute of Seismology China Seismological Bureau 730000 Lanzhou China 2. Institute of Geophysics China Seismological Bureau 100081 Beijing China

The apparent resistivity data of 11 stations observed in or near the epicentral regions for 6 strong earthquakes are processed by the normalized monthly rate method. The result show that in the medium-short and short-imminent terms of earthquake preparation the variation rate of apparent resistivity perpendicular (or near perpendicular) to the direction of maximum principal stress is greater than that parallel (or near parallel) to the direction. Such an-isotropic phenomenon is interpreted as follow: the predominant alignment of cracks containing conductive fluid in the maximum principal stress direction caused the anisotropy of the fluid migration during the dilatancy process in the late period of earthquake preparation and resulted in the anisotropy of true resistivity variation rate for rock (or solid) medium which induced the variation rate anisotropy of apparent resistivity on the ground. The study of this paper provides some seismic examples to show the apparent resistivity anisotropy which may be helpful to study the stress status in or near the source zone in the late period of earthquake preparation of strong events.

关键词： near epicentral region strong earthquake apparent resistivity true resistivity anisotropy principal compressional stress P319

The transformation between τ and TCB for deep space missions under IAU resolutions

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2012年第6期12卷 703-712页

作者： xue-Mei Deng Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China

For tracking spacecraft and performing radio science, the transformation between the proper time （τ） given by a clock carried onboard a spacecraft and the barycentric coordinate time （TCB） is investigated under IAU resolutions. In order to more clearly demonstrate manifestations of a physical model and improve computa- tional efficiency, an analytic approach is adopted. After numerical verification, it is confirmed that this method is adequate to describe a Mars orbiter during one year, and is particularly good at describing the influence from perturbing bodies. Further analyses demonstrate that there are two main effects in the transformation： the gravi- tational field of the Sun and the velocity of the spacecraft in the barycentric coordinate reference system. The combined contribution of these effects is at the level of a few sub-seconds.

关键词： reference systems -- time -- method: analytical -- method: numerical-- space vehicles

Hausdorff dimensions of some irregular sets associated with β-expansions

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2016年第3期59卷 445-458页

作者： LI Jin Jun LI bing School of Mathematics and Statistics Minnan Normal University School of Mathematics South China University of Technology

The Hausdorff dimensions of some refined irregular sets associated with β-expansions are determined for any β > 1. More precisely, Hausdorff dimensions of the sets {x ∈ [0, 1) :lim inf(n→∞) S_n(x, β)/n= α_1, lim sup (n→∞) S_n(x, β)/n= α_2}, α_1, α_2≥0 are obtained completely, where S_n(x, β) =sum ε_k(x, β) from k=1 to n denotes the sum of the first n digits of the β-expansion of x. As an application, we present another concise proof of that the set of points x ∈ [0, 1) satisfying lim_(n→∞) S_n(x,β)/n does not exist is of full Hausdorff dimension.

关键词： β-expansion irregular sets Hausdorff dimension

The Ext-Group of Unitary Equivalence Classes of Unital Extensions

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2011年第12期27卷 2329-2342页

作者： Yi Feng xue Department of Mathematics East China Normal University Shanghai 200241 P. R. China

Let A be a unital separable nuclear C＊-algebra which belongs to the bootstrap category N and B be a separable stable C＊-algebra. In this paper, we consider the group Ext,（A, B） consisting of the unitary equivalence classes of unital extensions T： A→ Q（B）. The relation between Ext,（A, B） and Ext（A, B） is established. Using this relation, we show the half-exactness of Ext,（-, B） and the （UCT） for Ext,（A, B）. Furthermore, under certain conditions, we obtain the half-exactness and Bott periodicity of Extu （A, .）.

关键词： Unital extension multiplier algebra Ext-group quasi-unital ,-homomorphism

On a Certain Sum-product Estimate in Fields of Prime Order

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 2014年第11期30卷 1861-1866页

作者： Bo Qing xue Academy of Mathematics and Systems Science Chinese Academy of Sciences

Let Fp be the finite field of p elements with p *** A is a subset of Fp and g is an element of F＊p with order ν,then max{｜A ＋ g·A｜,｜A·A｜} （ν/（ν ＋｜A｜2））1/12｜A｜13/12.

关键词： Sum-product estimate different sets fields of prime order

Acupoint Selection Standards of Auricular Therapy in the Treatment of Maintenance Hemodialysis Insomnia Based on Data Mining

在线全文

学校读者我要写书评

暂无评论

World Journal of Traditional Chinese Medicine 2024年第1期10卷 53-64页

作者： Jun-Xin Wang bing-Qian Zou Yu-Feng Chen Cheng-Long Wang Wei-Hong Li xue-Ling Ma Xiang-Di Liu Department of TCM Nursing School of NursingBeijing University of Chinese MedicineBeijingChina Department of Healthcare Beijing HospitalNational Center of GerontologyInstitute of Geriatric MedicineChinese Academy of Medical SciencesP.R.China Pharmacology of Integrated Chinese and Western Medicine School of Traditional Chinese MedicineBeijing University of Chinese MedicineBeijingChina Beijing Key Laboratory of TCM Syndrome and Formula School of Traditional Chinese MedicineBeijing University of Chinese MedicineBeijingChina Key Laboratory of TCM Syndrome and Formula School of Traditional Chinese MedicineBeijing University of Chinese MedicineMinistry of EducationBeijingChina

Background:Insomnia is a high-incidence complication in patients undergoing maintenance hemodialysis(MHD).Auricular therapy can effectively improve sleep with few adverse *** selection affects the impact of auricular ***,there is currently a lack of analysis on the standards of acupoint *** study used data mining technology to investigate the acupoint selection principles and characteristics of auricular therapy for the treatment of MHD-related ***:The objective of the study is to explore the standards of acupoint selection in auricular therapy for the treatment of MHD-related insomnia through data mining *** and Methods:We searched three English(PubMed,WOS,and Embase)and four Chinese(CNKI,VIP,Wangfang,and CBM)databases for studies on auricular therapy for MHD-related insomnia from self-establishment to November 14,***:Eighty-one publications were involved,which included 33 *** most common auricular points in patients with MHD-related insomnia were the Shenmen,heart,and kidney *** applications involved the visceral,nervous system,and specific *** effective clusters and two clusters were obtained through cluster analysis,including specific auricular points for insomnia,such as the multi-dream area,neurasthenia area,deep sleep point,and anterior ear *** network analysis showed that the core auricular acupoint combinations for the intervention of MHD-related insomnia were Shenmen with kidney,Shenmen with heart,heart with kidney,heart with Shenmen,and heart and Shenmen with ***:The selection of auricular points for the treatment of MHD-related insomnia was guided by the heart theory of traditional Chinese *** treatment attaches importance to the use of the multi-dream area,neurasthenia area,and other acupoints.

关键词： Acupoint selection standards auricular therapy data mining insomnia maintenance hemodialysis

On the Density of Integers of the Form 2~k + p in Arithmetic Progressions

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2010年第1期26卷 155-160页

作者： xue Gong SUN Department of Mathematics and Science Huai Hai Institute of Technology Lian Yun Gang 222005 P. R. China Department of Mathematics Nanjing Normal University Nanjing 210097 P. R. China

Consider all the arithmetic progressions of odd numbers, no term of which is of the form 2^k ＋ p, where k is a positive integer and p is an odd prime. ErdSs ever asked whether all these progressions can be obtained from covering congruences. In this paper, we characterize all arithmetic progressions in which there are positive proportion natural numbers that can be expressed in the form 2^k ＋ p, and give a quantitative form of Romanoff＇s theorem on arithmetic progressions. As a corollary, we prove that the answer to the above Erdos problem is affirmative.

关键词： covering system Romanoff's theorem arithmetic progression

The Value of Prealbumin and its Combination with NT-proBNP for Predicting in-hospital Mortality in Patients with Heart Failure:Real-World Research Based on Propensity Score Matching

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2023年第11期36卷 1090-1094页

作者： LIU bing XIE Jia Yi Cardiovascular Medicine Department Shengjing Hospital of China Medical UniversityShenyang 110004Liaoningchina

In recent years,extended life expectancies and lifestyle changes have markedly contributed to the increased incidence of heart failure(HF)worldwide[1].In China,while the age of patients with chronic HF has increased a... 详细信息

关键词： markedly mortality Patients

Reliability and validity of the translated Chinese version of Autism Spectrum Rating Scale (2-5 years)

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2019年第1期15卷 49-56页

作者： Hao Zhou Chun-Pei Li Yi Huang Xiao-bing Zou xue-Rong Luo Li-Jie Wu Lan Zhang Xiu Xu Wei-Li Yan Yi Wang Department of Neurology Children’s Hospital of Fudan UniversityNo.399 Wanyuan RoadMinhang DistrictShanghai 201 102China Guizhou Provincial People’s Hospital Medical College of Guizhou UniversityGuiyang 550002China Department of Psychiatry West China Hospital of Sichuan UniversityChengdu 6 1 004 1China Child Developmental—Behavioral Center The Third Affiliated Hospital of Sun Yat—Sen UniversityGuangzhou 5 10630China Department of Psychiatry The Second Xiangya Hospita of Central South UniversityChangsha 41 0008China School of Public Health Harbin Medical University Harbin 150081China Department of Child Health Chengdu Women and Children’s HospitalChengdu 6 1 009 1China Department of Child Health Children’s Hospital of Fudan UniversityShanghai 201 1 02China Department of Clinical Epidemiology Children’s Hospital of Fudan UniversityShanghai 20 1 1 02China State Key Laboratory of Medical Neurobiology Fudan UniversityShanghai 20 1 1 32China

Background Early autism screening is of great value,but there is lack of a screening tool of early age (2-5 years) in *** Autism Spectrum Rating Scale (ASRS,2-5 years) is a newly developed autism screening tool in the *** study aimed to evaluate the reliability and validity of the translated Chinese version of ASRS (C_ASRS) in Chinese children population before its application in China for early autism *** Caregivers of general children aged 2-5 years from 17 kindergartens and autism spectrum disorder (ASD) cases from five special education schools in five cities were recruited to complete the C_ASRS.1910 valid questionnaires from kindergarteners and 192 from ASD cases were included for *** The item reliability (Cronbach's alpha) was more than 0.80 in the screening scale and DSM-5 scale,and 0.51-0.81 in the treatment *** cases scored higher on total score and most subscales compared to the kindergarteners (Cohen's d ranging from 1.34 to 3.37).C_ASRS showed good discriminatory validity with an area under the receiver operating characteristic curve of 0.850 (95% confidence interval:0.819-0.881).The cutoff ≥ 60 achieved sensitivity of 65.63% and specificity of 85.63% in discriminating autism children from the general *** The results indicate that C_ASRS (2-5 years) could be used as an early level-2 screening tool for autism screening in China and should be further revised for level-1 screening.

关键词： Autism Autism Spectrum Rating Scale Chinese Reliability Validity