1,742,613 research outputs found
Celebrating 90 years of Peking University School of Life Sciences (1925–2015)
Full text link<正>The Department of Biology at Peking University was established in 1925,with Mr.Tan Xi Hong as its inaugural department head.In 1993,the department was renamed the School of Life Sciences.During the past 90 years,a steady stream of students has enrolled in the department in order to explore the se...SCI(E)PubMed中国科学引文数据库(CSCD)[email protected]; [email protected]
Research on Peking University Superconducting Accelerator Facility (PKU-SCAF)
No full textPeking University Superconducting Accelerator Facility (PKU-SCAF) is under development now. This facility is mainly composed of a DC-SC photocathode injector and a main accelerator with 9-cell cavity. It will provide high quality electron beams with 1 mA average current and 20 MeV energy.EI
Peking University First Hospital Procedure for Culturing Pathogenic Microorganisms for Bone and Joint Infection
Full text linkYunpeng Cui,1 Qiwei Wang,1 Chuan Mi,1 Bing Wang,1 Yuanxing Pan,1 Yunfei Lin,1 Rui He,2 Liying Sun,3 Bo Zheng,4 Xuedong Shi1 1Department of Orthopaedics, Peking University First Hospital, Beijing, People’s Republic of China; 2Department of Plastic Surgery and Burn, Peking University First Hospital, Beijing, People’s Republic of China; 3Department of Clinical Laboratory, Peking University First Hospital, Beijing, People’s Republic of China; 4Department of Clinical Pharmacology, Peking University First Hospital, Beijing, People’s Republic of ChinaCorrespondence: Xuedong Shi, Department of Orthopedic, Peking University First Hospital, Beijing, People’s Republic of China, Email [email protected]: This retrospective cohort study explores a practical approach to acquiring pathogenic microorganisms in patients with bone and joint infections.Methods: From Aug 2018 to Mar 2022, 68 consecutive patients (87 cultures) with bone and joint infection were recruited in this study. All cultures followed the Peking University First Hospital Procedure of Culturing Pathogenic microorganisms for bone and joint infection. Tissue samples were obtained through fluoroscopy-guided biopsy or open debridement. Tissue samples were divided into manual homogenization (MH), manual mixture (MM), and pathological examination. The baseline, antibiotic exposure, laboratory, surgical, and microbial data were reviewed. Independent sample T-test, Mann–Whitney U-test, and Chi-square test were used to detect the difference between patients who received different processing measures.Results: The average age was 55.8± 2.4 years old. Thirty-nine patients were male. The total positive culture rate of the manual homogenization group was 80.5% (70/87). Thirty-five patients had mixed infections with more than one microorganism cultured. Staphylococci accounted for 60.23% of all microorganisms. Staphylococcus aureus (18.2%) and Staphylococcus epidermidis (15.9%) were the two most common bacteria cultured in this study. Patients with positive culture in the manual mixture group had significantly higher WBC (p = 0.006), NE% (p = 0.024), ESR (p = 0.003), CRP (p = 0.020) and IL6 (0.050) compared to patients with negative culture. After tissue homogenization, only ESR is still statistically different. Patients without SIRS had a low positive culture rate (59.4%). Tissue homogenization could significantly increase the positive culture rate of patients without SIRS. Pre-culture antibiotic exposure was not an independent risk factor for culture results.Conclusion: Peking University First Hospital Procedure for Culturing Pathogenic microorganisms for Bone and Joint Infections was a practical approach for obtaining pathogenic microorganisms.Keywords: bone and joint infection, systemic inflammatory response syndrome, antibiotic, tissue homogenizatio
From SPOC to MPOC - The effective practice of Peking University online teacher training
No full textMPOC-Massive Private Online Course, is an online teacher training course developed by Peking University in 2006. This course was designed on the model of SPOC, 20-25 trainees each online class. But influenced by the prejudice of Online Course in China and lower tuition, the real size of the online class is between 80 to 120. An online facilitator is assigned to the online class to lead online trainees to fulfil the online learning activities, assess their achievements and provide feedback to trainees timely. From 2007-2013, nearly 500000 k-12 teachers had enrolled this online training course in about 5000 online classes, about 2000 online facilitators had joined the online training program, figured out an effective K-12 teacher MPOC online teacher training practice in China. ? 2014 IEEE.EI
Peking Seminar: New Media Art
No full textGraham, Beryl (2017) “Peking Seminar: New Media Art.” Peking University seminar series: Prof. Laozhu, staff and PhD researchers of Media Lab (National Committee of Experimental Art), Annual of Contemporary Art of China. 26 November. Beijing: Peking University. Invited seminar leader
Analysis of the structure and evolution of the co-borrowing network in Peking University Library
No full textIn a university library, students from different backgrounds are connected by borrowing the same books, and the co-borrowing relationship forms a knowledge sharing network for books are carriers of knowledge. Studying the structural properties helps us understand the knowledge sharing behaviors among students. This paper presents an in-depth analysis of the structural properties and how the properties evolve over time of the co-borrowing network in Peking University library. We find out that the co-borrowing network presents common features of social network including power-law degree distribution, a giant component, small diameter and high clustering. By the temporal analysis, we find out that the power law exponential parameter ?, the diameter and the number of connected components decline over time, and the size of second largest connected component exhibits stabilization after the first few months. To the best of our knowledge, this is the first work to analyze the temporal properties of the co-borrowing network. ?2010 IEEE.EI
The development of information system in general hospitals: A case study of Peking University Third Hospital
No full textHealthcare Information system (HIS) building is an important way to improve hospital efficiency and health care quality. This article describes the process of HIS development in general hospitals in china as the Peking University Third Hospital (PUTH) for example. By expanding wirelesses AP and digital system in PUTH, the hospital has made great achievements in the building of electronic medical record system, public reservation registration platform, personal digital assistant, treatment before settlement and the DRGs. According to the previous experiences, it also gives some suggestions for further HIS development in general hospitals. The suggestions include reasonable planning, efficiency and effectiveness, data processing, information standardization, staff participation and updating information system. ? Springer Science+Business Media Dordrecht 2014.EI
Researches and Experiments on Niobium-Sputtered Superconducting QWR in Peking University
No full textR&D on SC quarter wave resonators (QWRs) for heavy ion linacs were initiated in China several years ago. A DC bias-voltage sputtering technology was developed in Peking University for niobium-coated copper QWR. A niobium-sputtered copper QWR with good niobium films was successfully made in October 1999. Low temperature experiments was done from November 1999 to September 2000. The accelerating gradient of 5??6 MV/m can be obtained with no beam load at 4.2 K. The QWR is installed after the 2??6 MV tandem and is used to accelerate proton beams. The accelerating gradient of 3 MV/m was obtained with proton beam load.EI
Deuteron injector for Peking University Neutron Imaging Facility project
No full textThe deuteron injector developed for the PKUNIFTY (Peking University Neutron Imaging Facility) has been installed and commissioned at Peking University (PKU). The injector system must transfer 50 keV 50 mA of D+ ion beam to the entrance of the 2 MeV radio frequency quadrupole (RFQ) with 10% duty factor (1 ms, 100 Hz). A compact 2.45 GHz permanent magnet electron cyclotron resonance (PMECR) ion source and a 1.36 m long low energy beam transport (LEBT) line using two solenoids was developed as the deuteron injector. A 05 mm four-quadrant diaphragm was used to simulate the entrance of RFQ electrodes. The beam parameters are measured after this core with an emittance measurement unit (EMU) and a bending magnet for ion fraction analysis at the end of injector. During the commissioning, 77 mA of total deuteron beam was extracted from PMECR and 56 mA of pure D+ beam that passed through the 05 mm four-quadrant diaphragm was obtained at the position of RFQ entrance with the measured normalized rms emittance 0.12-0.16 pi mm mrad. Ion species analysis results show that the deuteron fraction is as high as 99.5%. All of the parameters satisfy PKUNIFTY's requirements. In this paper, we will describe the deuteron injector design and report the commissioning results as well as the initial operation. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3670345]Instruments & InstrumentationPhysics, AppliedSCI(E)EI3ARTICLE2null8
Improvements and applications of AMS radiocarbon measurement at Peking University
Get PDFAMS radiocarbon measurements were started at Peking University in 1992 with a modified HICONEX 834 ion source. Some archaeological samples were measured at a sensitivity of 10(-14) with ca. 1.7% precision for modern samples. We have made many improvements in our first two years of operation: a high-intensity Cs sputtering ion source was installed; the graphite sample preparation technique was investigated; and the system stability has been improved. The blank sample background is currently ca. 0.006 MC and a precision within 1% can be reached for modern samples. Geological, archaeological, environmental and biomedical samples can be measured routinely. We present some typical applications.Geochemistry & GeophysicsSCI(E)
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