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Search Results: 1 - 10 of 76809 matches for " 徐沙 "
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所謂生物學戰爭
C.賓學崢
科学通报 , 1951,
Abstract: 從最近各方報紙上的報導,我們知道美國已在日本大规模地從事細菌武器的製造,企圖用其滅絕人性的手段,毒害我中朝兩國的軍民。美國這種慘無人道的罪行,最後必然受到全體愛好和平人民的最嚴厲的懲罰! 另一方面,正如蘇聯科學院微生物學研究所所長伊姆舒納茨基教授於3月24日對塔斯社記者所指出的:蘇聯微生物學家們的一切努力都針對着向那些引起疾病的種種細菌進行鬥爭,尋求新的抗菌藥物用來制止疾病;而美國帝國主義者却用鉅欵創辦“死亡制造廠”,在那些地方培養和制造著大量的鼠疫、炭疽熱、傷寒及其他疾病的細菌。 從這一件事情上,分明地說明了蘇聯的科學家們正努力於如何克服自然,支配自然,以提高廣大人民群衆的生活水平;而美日帝國主義的罪徒們,正正相反,却利用微生物來大規模地毀滅人類! 這篇文章原載於英國1950年12月出版的“發現”(Discovery)雜誌上,作者賓沙(Chapman Pincher)以超然的純技術的觀點,無關痛癢地叙述了生物學戰爭的發展歷史及其所知的現狀,。但這一切,對於全世界勞動人民來說,確是一個嚴重的“發现”!這讓我們認清了帝國主義者真正的嘴臉!我們應以最大的警惕,把抗美援朝運動更深入一層。因此,在今天譯出這一篇文章是具有很大教育意義的——譯者附言。
Internet网上中药信息资源的利用
,,余宇燕
中国中药杂志 , 2002,
Abstract: 进入20世纪90年代以来,国际互联网(Internet)的迅猛发展为世界各地区之间的信息交流和资源共享提供了经济、快捷的条件。因特网已成为世界上规模最大,信息资源最丰富的计算机网络。随着国际上尤其是发达国家对中草药和天然药物的日益重视,越来越多的中药相关信息进入互联网中成为丰富的资源。如何在纵横交错的Internet信息网络中获取我们需要的信息,为科研、教学、生产服务,是广大中药工作者所迫切需要的。虽然我国在1994年后....
基于熵的区域旅游系统的自组织研究――以长江三角洲为例
,靳诚,
南京师范大学学报(自然科学版) , 2008,
Abstract: 从自组织的特征出发,将旅游系统作为研究对象,详细分析了旅游系统的内部特征,发现旅游系统符合耗散结构的开放性、远离平衡态、内部适应非线形调节三个特征,因而证明了旅游系统的演化过程是一个自组织的过程.在此基础上利用熵值来度量自组织的程度,对系统的外熵、内熵及其两者的相互作用机理进行了深入的分析,刻画自组织的演变过程,并在理论研究的基础上以长三角为例,做了实证研究.
搜索策略及其技术实现
那一,炳亭
天津大学学报(自然科学与工程技术版) , 2001,
Abstract: 组卷策略是试题库系统的核心,关系到系统生存与发展.重点论述搜索策略以及搜索策略的技术实现,并为策略使用者建立数学模型,同时提供策略的数据流程图.
一种分数傅里叶变换域的切普信号扩频通信方式
学军,郭佩,玉滨
哈尔滨工程大学学报 , 2009, DOI: 10.3969/j.issn.1006-7043.2009.08.018
Abstract: 在直扩通信系统中,当干扰信号瞄准频谱中心频率时,将严重影响信号的解调.针对这一问题,该文提出一种基于分数傅里叶变换(FRFT)的切普(Chirp)信号扩频方法,该方法采用Chirp信号对二进制基带码元进行扩频,Chirp在相应的分数傅里叶变换域上有最佳的能量聚集特性.通过改变扩频所用Chirp信号的调频率k的取值使其在相应的分数傅里叶域上的能量聚集位置(即峰值位置)不同而实现凋制,在接收端通过对峰值位置的判决解调出相应的信息.仿真分析表明,该方法可获得较好的误码率性能,且具有结构简单、运算量小的特点.
针灸联合神经节苷脂及甲钴胺治疗特发性面神经麻痹的疗效观察
王丽平,李丹,
- , 2017,
Abstract: 目的观察针灸联合神经节苷脂及甲钴胺治疗特发性面神经麻痹(IFP)患者的临床疗效。 方法将120例IFP患者随机分为神经节苷脂组、甲钴胺组和联合组,每组40例。3组患者均采用常规治疗及针灸治疗,神经节苷脂组在此基础上加用神经节苷脂注射液,甲钴胺组在常规及针灸治疗基础上辅以甲钴胺注射液治疗,联合组采用神经节苷脂及甲钴胺进行治疗,每日1次,共治疗14d。观察治疗前、后的House-Brackmann面神经功能量化评分、患侧面神经复合肌肉动作电位(CMAP)波幅及R1潜伏期。 结果联合组治疗后总有效率为95.0%,高于神经节苷脂组(90.0%)及甲钴胺组(87.5%),差异有统计学意义(P<0.05)。治疗后,联合组患侧CMAP波幅较神经节苷脂组及甲钴胺组有所改善,治疗后联合组R1潜伏期较神经节苷脂组及甲钴胺组缩短,差异均有统计学意义(P<0.05)。 结论针灸联合神经节苷脂钠及甲钴胺注射液治疗IFP的疗效较好,可有效改善IFP患者的临床症状、患侧CMAP波幅及R1潜伏期。
Objective To observe the clinical effect of acupuncture combined with ganglioside and mecobalamine injections on idiopathic facial palsy (IFP). MethodsA total of 120 IFP patients were divided into a ganglioside group, a mecobalamine group and a consociation group, each of 40. All were given routine drug and acupuncture treatment, while the ganglioside and mecoblamine groups were additionally provided with the corresponding injections of ganglioside and mecobalamine, respectively. The treatment was administered once daily for a total of 14 days. All the groups were evaluated using the House-Brackmann facial nerve grading system before and after the interventions of 14 days ended. The compound muscle action potential (CMAP) wave amplitude and R1 incubation, the motor nerve conduction velocity (MCV) and the sensory nerve conduction velocity (SCV) of the affected facial nerves were observed and compared before and after the 14 days of treatment. Results The total effectiveness rate of the consociation group (95.0%) was significantly higher than that of the ganglioside (90.0%) or the mecobalamine group (87.5%). After the treatment the CMAP wave amplitude had improved significantly and the R1 latency had shortened significantly in the consociation group compared to the other 2 groups. The average MCV and SCV of the consociation group had also improved significantly compared with the other two groups. ConclusionAcupuncture combined with ganglioside and mecobalamine injections is an effective therapy for idiopathic facial palsy. It can improve the patient′s clinical symptoms, shorten the CMAP wave amplitude and R1 latency on the affected side and improve MCV and SCV
干预-应答模式鉴别学习障碍的有效性及其调节因素:20年研究的元分析
The Validity of the RTI Model for Identifying Learning Disabilities and the Moderators: A Meta-analysis of the Past Two Decades' Studies

王翠翠,琴芳,
- , 2016, DOI: 10.16187/j.cnki.issn1001-4918.2016.06.09
Abstract: 本研究采用元分析方法探讨在学习障碍的鉴别中兴起的干预-应答(Response to Intervention,RTI)模式鉴别学习障碍内部亚组的有效性及其调节因素。通过系统检索1996-2015年的文献,获得了34项研究,包括6127名学生的45个样本、261个效应值。元分析结果表明,RTI模式可有效区分学习障碍风险儿童的内部亚组,对干预无应答和有应答的学生在学业成就、认知技能、行为等多方面存在系统、显著和持久的差异,但仍存在个体应答状态的进一步分化。RTI模式对于学习障碍风险儿童内部变异的区分效果受到干预对象、干预层次、干预时间、应答指标选择、测量方法和切分点等因素的影响。本元分析结果不仅为认识RTI模式鉴别学习障碍的有效性提供了进一步证据,更重要的是通过系列调节效应分析,为合理实施RTI模式鉴别学习障碍提供了直接依据。
Learning disability is one of common neurocognitive developmental disorders among children and adolescents. The mode of Response to intervention (RTI) has been recommended to identify learning disabilities since 2004.However, the validity of the RTI model for identifying learning disabilities has been questioned. This study aimed to exam the validity of the RTI model and the moderating effects of the major variables being involved in the application of RTI model on the basis of the past two decades' of studies. Articles were obtained using keywords, i.e., "RTI(response to intervention) "and "Dyslexia" or "Dyscalculia" or "Specific learning difficulties/disorders" or "Reading disorder (s)/difficulties" or "Mathematical disorder (s)/difficulties" from Web of science, Psychoinform and CNKI. Thirty-four studies published within 1996 to 2015 met the criteria and were included into the meta-analysis, yielding 45 samples (N=6,127) and 261 weighted effect sizes (ESs). Results indicated:(1)The non-responders performed significantly poorer on academic achievement, cognitive skills and behaviors than the responders, and the ESs of all the variables were above 0.5.(2)Evidences from six longitudinal studies indicated that the gap between the groups of responders and non-responders were persistent across time on academic achievement and cognitive skills, but some responders may perform similarly to the non-responders at the follow-up assessments.(3)Moderating effects were found significant for the severity of learning difficulty, intervention tier and duration. Significantly larger ESs emerged from the studies about at-risk students, using short-term intensive Tier 2 intervention rather than from those students with severe learning difficulties, using long-term multi-tiered intervention.(4)Moderating effects were also found significant for measures and criteria of responsive status. Academic achievement rather than cognitive skills were more reliable as the indicators of responsiveness. Compared with the growth or the dual discrepancy criteria, the achievement status was more reliable in differentiating responders and non-responders. When standardized, norm-referenced instruments were used for
白喉乌头水浸提液对禾本科牧草种子萌发的化感作用
彩芹,,何君
草业科学 , 2012,
Abstract: ?采用培养皿滤纸法在人工气候箱中研究了白喉乌头(Aconitumleucostomum)水浸提液对4种禾本科牧草种子萌发的影响。结果表明,白喉乌头根和茎叶的水浸提液对4种牧草种子萌发率和萌发指数具有抑制作用,且根的抑制作用大于茎叶;对萌发指数影响大于萌发率;抑制作用随水浸提液质量浓度的增加而加大;4种牧草对白喉乌头化感作用敏感性从强到弱依次为无芒雀麦(Bromusinermis)、黑麦草(Loliumperenne)、草地早熟禾(Poapratensis)、苇状羊茅(Festucaarundinacea)。
乙烯裂解炉管内流动反应历程的数值模拟(Ⅰ)二维流动反应数学模型的建立
,张红梅,高金森,春明
化工学报 , 2003,
Abstract:
基于应变式传感器的桥梁无线测试系统的设计和实现
黄侨,李忠龙,学军,玉滨
公路交通科技 , 2007,
Abstract: 针对传统的应变式采集仪以有线方式进行数据采集和传输方法存在的问题,结合电阻应变式传感器的工作机理,提出了一种基于应变式传感器网络化的桥梁无线测试系统,使用采集软件、单片机、调制解调器FX429等主要器件,实现了数据的高精度采集。在可靠的通信协议下,采用无线方式进行主控节点和各远端数据采集节点之间的数据传输。并利用数据库技术,实现数据管理。通过主控软件,提高了系统的方便与灵活性。对比试验研究表明该无线系统具有安全、高效、可靠、精度高、稳定性强,无需借助现有的通信网络、成本低、适应性好等优点。
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