污染数据线性回归模型的贝叶斯估计

本文研究线性回归模型中响应变量受到另一随机变量序列污染时,模型参数和污染系数的估计问题.利用贝叶斯统计原理,给出了污染系数的贝叶斯区间估计及模型参数估计.     

Particle contamination, the disruption of electronic connectors in the signal transmission system

Particle pollution in air, also sometimes known as fine dust contamination, may cause electric contact failure. Recent research further proved that the fine particle is becoming a major disruption of the electronic connectors in signal transmission system. This paper specifies the connector contact in mobile phone application. To study the contact failure of mobile phone, a series of inspections and analytical research methods are introduced. Special features that cause the contact failure are summarized. Particle accumulation is the main problem; organic material such as lactates from sweat of the human body may act as adhesives to stick the separate particles together and make them adhere on the contact surface; chemical properties of dust cause serious local corrosion. The corrosion products may trap the particles and firmly attach on the contact surface; micro motion frequently occurs at the contact interface. Hard particle can be embedded into the surface, and soft particle could be squeezed and inserted into the contact; silicon compounds in dust play the most important role in forming high resistance regions that lead to failure; deposition of particles depends on the amount of materials, static electricity attracting force and gravity force applied on the particles. Current dust test can hardly reflect the serious contact failure. It is difficult to simulate the complexity of contact failure caused by particle contamination. Thus alternative ways of simulation experiment and improvement of contact reliability are proposed.     

挡墙结构排水污染的解决及实例

阐述挡墙排水孔的必要性及其不良影响 ,提出可采用导水沟槽解决排水孔渗水污染的办法 ,并以某工程实例论证     

龙岩市新装修房室内空气中甲醛污染调查分析

对新装修房室内空气污染物甲醛浓度进行了测定,并对新装修房的装修情况进行了调查。从空间容量,外购家具,装修材料种类、用量,施工工艺,通风时间和效率几个方面讨论了对室内空气中甲醛浓度的影响。得出合理利用材料,合理的施工工艺和进行通风是使室内空气中甲醛浓度达标的关键。     

基于数字医学平台的大型仪器设备的共享与管理

分析了基于数字医学平台的大型医学仪器设备共享平台建立的必要性,阐述了共享平台的建设原则和平台组成模块,并对平台管理工作中应注意的问题进行了思考,旨在建立功能完备的共享机制,最大限度地发挥医学仪器设备的使用效益。     

虚拟仪器技术在医疗仪器教学中的应用

介绍了一种采用LabVIEW开发平台来实现医学仪器原理课程实验教学的新方法。以人体心电信号测量为例,探讨了以虚拟仪器技术为核心的医学仪器设计实验的应用,大大提高了实验效率,降低了实验成本,增强了学生的积极性和创造性,对构建新的医学仪器原理课程实验教学方案、研究式实验教学模式做了有益的探索。     

提高医药院校实验仪器设备完好率探究

在仪器设备使用和维修保养方面,医药院校与理工科院校教师、实验技术人员之间存在着差距,针对医药院校如何提高仪器设备完好率的问题进行了探究,以提高仪器设备的完好率。     

Clinical analysis of minimally invasive McKeown esophagectomy in a single center by a single medical group

Objective: McKeown esophagectomy followed by cervical and abdominal procedures has been commonly used for invasive esophageal carcinoma. This minimally-invasive operative procedure in the lateral prone position has been considered to be the most appropriate method. We describe our experiences in minimally invasive McKeown esophagectomy (MIME) for esophageal cancer. Methods: Between March 2016 and February 2018, a total of 82 patients underwent MIME by a single group in our department (a single center). All procedure, operation, oncology, and complication data were reviewed. Results: All MIME procedures were completed successfully, with no conversions to open surgery. The median operative time was 260 min, and median blood loss was 100 ml. The average number of total harvested lymph nodes was 20.1 in the chest and 13.5 in the abdomen. There were no deaths within 30 postoperative days. Twenty cases (24.4%) developed postoperative complications, including anastomotic leak in 4 (4.9%), single lateral recurrent nerve palsy in 4 (4.9%), bilateral recurrent nerve palsy in 1 (1.2%), pulmonary problems in 3 (3.7%), chyle leak in 1 (1.2%), and other complications in 7 (including pleural effusions in 4, incomplete ileus in 2, and neck incision infection in 1; 8.54%). Average postoperative hospitalization time was 12 d. Blood loss, operation time, morbidity rate, and the number of harvested lymph nodes were analyzed by evaluating learning curves in different periods. Significant differences were found in operative time (P=0.006), postoperative hospitalization days (P=0.015), total harvested lymph nodes (P=0.003), harvested thoracic lymph nodes (P=0.006), and harvested abdominal lymph nodes (P=0.022) among different periods. Conclusions: Surgical outcomes following MIME for esophageal cancer are safe and acceptable. The MIME procedure for stages I and II could be performed proficiently and reached an experience plateau after approximately 25 cases.     

Cytocompatible cellulose nanofibers from invasive plant species Agave americana L. and Ricinus communis L.: a renewable green source of highly crystalline nanocellulose

In this study, the fibers of invasive species Agave americana L. and Ricinus communis L. were successfully used for the first time as new sources to produce cytocompatible and highly crystalline cellulose nanofibers. Cellulose nanofibers were obtained by two methods, based on either alkaline or acid hydrolysis. The morphology, chemical composition, and crystallinity of the obtained materials were characterized by scanning electron microscopy(SEM) together with energy-dispersive X-ray spectroscopy(EDX), dynamic light scattering(DLS), X-ray diffraction(XRD), and Fourier transform infrared(FTIR)spectroscopy. The crystallinity indexes(CIs) of the cellulose nanofibers extracted from A. americana and R. communis were very high(94.1% and 92.7%, respectively). Biological studies evaluating the cytotoxic effects of the prepared cellulose nanofibers on human embryonic kidney 293 T(HEK293 T) cells were also performed. The nanofibers obtained using the two different extraction methods were all shown to be cytocompatible in the concentration range assayed(i.e., 0-500 μg/mL). Our results showed that the nanocellulose extracted from A. americana and R. communis fibers has high potential as a new renewable green source of highly crystalline cellulose-based cytocompatible nanomaterials for biomedical applications.     

高校仪器设备验收存在的问题及对策

以浙江师范大学为例,总结了高校仪器设备验收工作在采购合同、验收管理制度及验收方法方面存在的问题.提出了规范采购合同、健全验收管理制度、选择合理有效的验收方法的对策建议.     

高校仪器设备效益考核导向的探讨

探讨了高校仪器设备效益考核存在的主要问题,提出了针对教学仪器设备评估的策略导向和措施,并结合实际情况进行了实践。     

政策网络中教育政策工具的选择

政策网络是教育政策工具选择的“核心环境”。在教育政策网络中,教育政策工具应根据不同的网络类型来选择。在操作层面,教育政策工具的选择要强调教育政策工具的优化组合以及教育政策工具的执行力和评估,     

高校实验室设备的动态过程管理

教育经费的投入使得高校仪器设备不断增多,仪器设备的使用和管理成为高校设备管理工作的一个重要课题。阐述了仪器设备的动态管理体系,实现仪器设备的全程可控管理和高效管理。     

精密仪器设计实验教学改革探讨

介绍了精密仪器设计课程教学内容及课内实验设置情况,分析了该课程实验教学中存在的主要问题,提出了实验教学改革措施,以提升该课程的教学质量。     

自制物理实验仪器的探索与实践

论述了自制实验仪器的必要性和可行性,举例说明了佛山科学技术学院光电子与物理学系自制物理实验仪器的情况,探讨了自制仪器在促进实验教学改革、提高实验教学质量、培养学生创新能力、提高实验队伍业务水平、推进实验示范中心建设等方面产生的作用。     

大理某医院检验报告单带菌情况分析

目的：研究检验报告单的带菌情况,并行菌属及菌种类型分析。方法：在检验报告单上直接取样增菌接种于血琼脂平板和麦康凯平板培养,用形态学检验及生化反应鉴定到种。结果：1 000份检验报告单,血琼脂平板共生长细菌719株,其中葡萄球菌属518株占72.04%,肠道杆菌175株占24.34%,枯草杆菌26株占3.62%。麦康凯平板共生长细菌369株,其中葡萄球菌属299株占81.03%,肠道杆菌70株占18.97%。结论：检验报告单主要带菌为葡萄球菌和肠道杆菌,其中葡萄球菌以表皮葡萄球菌和金黄色葡萄球菌为主,肠道杆菌以耶氏菌和志贺氏菌为主。     

高校仪器设备管理中的应对措施分析

该文围绕仪器设备管理这项高校实验室工作的基础问题,从管理中出现的新问题入手,对其产生根源和解决方案进行了剖析,有针对性地提出了一些应对措施,并就今后的工作提出了一些思考和设想。     

泰州市食源性致病菌污染状况的调查研究

目的了解沙门氏菌、单增李斯特菌、空肠弯曲菌、副溶血性弧菌在泰州市零售食品中的污染状况,为食源性疾病监测、预防提供科学依据。方法根据国标方法,对泰州市出售的生畜禽肉、熟肉制品、蔬菜、水产品中4种致病菌进行检测。结果2006年-2008年共检测样品695份,检出致病菌91株,总检出率为13．09％。其中沙门氏菌检出28株,检出率为4．03％;单增李斯特菌检出44株,检出率6．33％;副溶血性弧菌检出19株,检出率2．73％;未检出空肠弯曲菌。结论泰州市生畜禽肉、熟肉制品中存在不同程度的致病菌污染,其中单增李斯特菌污染较严重,应加强监测和检查。     

The role of medical museums in contemporary medical education

From the early 19th century until the most recent two decades, open‐space and satellite museums featuring anatomy and pathology collections (collectively referred to as “medical museums”) had leading roles in medical education. However, many factors have caused these roles to diminish dramatically in recent years. Chief among these are the great advances in information technology and web‐based learning that are currently at play in every level of medical training. Some medical schools have abandoned their museums while others have gradually given away their museums' contents to devote former museum space to new classrooms, lecture halls, and laboratories. These trends have accelerated as medical school enrollment has increased and as increasing interest in biological and biomedical research activities have caused medical schools to convert museum space into research facilities. A few medical schools, however, have considered the contents of their museums as irreplaceable resources for modern medicine and medical education and the space these occupy as great environments for independent and self‐directed learning. Consequently, some medical schools have updated their medical museums and equipped them with new technologies. The Anatomical Museum of Leiden University Medical Center in The Netherlands and the Medical Museum of Kawasaki Medical School in Kurashiki, Okayama, Japan, are two examples of such upgraded museums. Student surveys at Leiden University have indicated that all students (100%) found audio‐guided museum tours to be useful for learning and majorities of them found guided tours to be clinically relevant (87%). However, 69% of students felt that museum visits should be optional rather than compulsory within the medical training curriculum. Anat Sci Educ 3:249–253, 2010. © 2010 American Association of Anatomists.     

数控加工实践教学视频监控应用探索

介绍数控视频监控系统在数控实践教学中的应用,利用它的视频监控功能,解决了在数控实践教学中由于学生数量多容易造成操作事故的问题,提高了学生数控机床的操作能力。