共查询到20条相似文献，搜索用时 971 毫秒
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董鸿飞 《赤峰学院学报(自然科学版)》2018,(9)
本文使用IBM(相互作用玻色子)模型对偶偶核_(48)~(98)Zr进行了研究.拟合了_(48)~(98)Zr核的低能谱的谱带,计算了_(48)~(98)Zr核的低能谱的电磁跃迁,分析了部分态的波函数和哈密顿量.计算结果表明理论计算与实验值符合较好.数据分析表明_(48)~(98)Zr是具有U(5)振动极限到SU(3)转动极限之间的过渡核. 相似文献
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欧洲核研究中心(CERN)建造的大强子对撞机(LHC)是世界上能量最高的粒子加速器。它的设计是,使两个运动方向相反的粒子束流对撞,每个束流包含能量各为3.5 TeV的质子(1 TeV即10~(12)电子伏特)或能量各为574 TeV的铅核(其中每个核 相似文献
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孙秀民 《辽宁教育行政学院学报》2003,(7)
自从张静如教授提出“以社会史为基础深化党史研究”的倡议后 ,中共历史学界越来越多的人尤其是中青年人便开始了这方面的研究 ,已经发表了许多篇论文并出版了一系列的专著。师吉金在其博士论文基础上修改而成的专著《构建与嬗变———中国共产党与当代社会之变迁 ( 194 9— 195 7)》(济南出版社 2 0 0 3年版 )就是其中之一。该书视角新颖、结构严谨、资料详实 ,是研究当代中国社会变迁的一部力作。一、此书对 194 9— 195 7年的中国社会进行了全方位的研究自从社会史形成一门学科以来 ,国外对于社会史的研究对象就有不同的理解。对于这一点… 相似文献
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介绍应用分离振荡技术测量类氢氦离子(~4He~ )的兰姆移动,由于氦原子的核体积精度比氢原子的核体积精度高,从而提高了兰姆移动的测量精度,使理论值和实验值符合得更好。 相似文献
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本文采用动力学对称X(5)及现有的实验数据对146Ba核的低能正宇称态的能谱和电磁跃迁进行了分析研究,计算的结果和实验数据符合得很好.研究表明,146Ba核的低能态具有X(5)动力学对称特性,即146Ba核可能是一个X(5)核. 相似文献
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对于函数 f(x)=(ax b)~(1/2) (cx d)~(1/2)(ac<0)的值域,本刊1997年第4期第36页上介绍了“柯西不等式法”和“参数代换法”两种方法,读后受益匪浅,今再介绍一种新方法,供师生教学参考.例1 求函数 y=(3x 6)~(1/2) (-x 8)~(1/2)的值域.解:y=3~(1/2)·(x 2)~(1/2) (-x 8)~(1/2).设 y_1=(x 2)~(1/2)-3~(1/2)·(-x 8)~(1/2),则 相似文献
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本刊1984年3期中《(a2)~(1/2)+(a_3)~(1/2)>(a_1)~(1/2)+(a_4)~(1/2)的一种简捷判定法》一文指出:当a≥0m>0,n≥0时,有(a+m)~(1/2)+(a+m+n)~(1/2)>a~(1/2)+(a+2m+n)~(1/2)成立。并给出了代数证明。本文对以上结论给出它的一个几何解释。由于((a+m)~(1/2))~2-(a~(1/2))~2=m-(m~(1/2))~2, 相似文献
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用代数方法求y=(x~2-2x 5)~(1/2)±(x~2-4x 13)~(1/2)的值域非常繁难.如果仔细观察,此题可以写成y=[(x-1)~2 (0-2)~2]~(1/2)±[(x-2)~2 (0-3)~2]~(1/2)的形式,故可转化为求动点P(x,0)到定点A(1,2)和B(2,3)的距离之差(和)的取值范围问题,这样就能借助于解析几何有关知识加以解决。此类问题就是求 相似文献
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介绍采用AT89C51单片机与MAX195A/D转换器实现高精度数据采集的方法，分析其硬件接口及软件编辑技巧，并给出相应的电路及程序代码。 相似文献
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Spear-Swerling Louise Wei Yan Dostal Hannah Hernandez Brittney 《Reading and writing》2020,33(8):2097-2119
Reading and Writing - This study examined the print exposure of teacher candidates (N?=?195) in relation to their GPAs, achievement in reading and writing on the SAT, and their... 相似文献
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本研究考查了180名10—12岁儿童羞愧感理解的特点。研究结果表明:(1)10—12岁儿童能够理解羞愧感,在理解程度上有年龄差异;(2)“公开化与私人化”与羞愧感的产生密切相关,而“个人无能与违背道德”与羞愧感的产生无关,却与内疚感的产生密切相关;(3)10—12岁儿童认为产生羞愧感主要是由于不适的行为和害怕被公开。 相似文献
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BackgroundIt is estimated that more than half of children living in households where intimate partner violence (IPV) occurs are also exposed to animal cruelty (AC). Although prior research links bonds with pets with higher levels of socioemotional competence among school-age children, exposure to AC may negate the protective effects of pet ownership and/or exacerbate the potentially deleterious effect of IPV on children’s mental health.ObjectiveThe current study evaluates whether and to what extent the associations between exposure to IPV and several indicators of children’s mental health vary as a function of children’s positive engagement with pets and exposure to AC.Participants and SettingParticipants included 204 children (aged 7–12 years; 47% female; 57% Latinx) and their maternal caregiver who were recruited from domestic violence agencies in a western U.S. state.MethodMultiple moderation analysis evaluated whether the association between children’s exposure to IPV and internalizing and posttraumatic stress symptoms vary as a function of children’s positive engagement with pets and exposure to AC.ResultsAnalyses revealed several moderation effects for positive engagement with pets (e.g., internalizing problems: [b = −.15, t(195) = −2.66, p = .008]; posttraumatic stress symptoms: [b = −.13, t(195) = −2.24, p = .026]), whereas exposure to AC only moderated the association between IPV and anxious/depressed symptoms (b = .32, t(195) = −2.41, p = .017).ConclusionsThese findings highlight the potential protective effects of positive engagement with pets and importance of screening for exposure to AC when engaging in trauma-informed work with children exposed to IPV. 相似文献
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目的:探讨P_(53)、Bcl-2基因蛋白在大肠癌中的表达及临床病理联系。方法:对88例大肠癌手术切除标本进行石蜡切片SP法免疫组织化学染色。结果:P_(53)、Bcl-2基因在大肠癌组织中表达率分别为55.68％(49/88)、63.63％(56/88),癌旁移行区粘膜上皮及腺体P_(53)、Bcl-2阳性表达率分别为3.12％(2/64)、31.25％(20/64),二者均有显著性差异(P<0.01)。P_(53)与大肠癌浸润深度有关(P<0.05),而与组织学类型、分化程度、有无淋巴结转移关系不显著(P>0.05)。Bcl-2的表达率在无淋巴结转移大肠原发癌中高于有淋巴结转移的大肠原发癌(P<0.01)。而在淋巴结转移癌组织中Bcl-2表达率高于原发癌组织Bcl-2表达率,差异有显著性(P<0.05)。结论:P_(53)、Bcl-2在大肠癌组织中均有高表达,可能与细胞恶变有密切关系,P_(53)与大肠癌浸润进展有关,与其它生物学行为关系不大;Bcl-2在大肠癌无淋巴结转移前有高表达,在淋巴结转移癌中的表达高于原发癌,提示Bcl-2的表达参与大肠癌转移的形成。 相似文献
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Preserving the Past: An Early Interview Improves Delayed Event Memory in Children With Intellectual Disabilities 
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下载免费PDF全文 The influence of an early interview on children's (N = 194) later recall of an experienced event was examined in children with mild and moderate intellectual disabilities (CWID; 7–12 years) and typically developing (TD) children matched for chronological (7–12 years) or mental (4–9 years) age. Children previously interviewed were more informative, more accurate, and less suggestible. CWID (mild) recalled as much information as TD mental age matches, and were as accurate as TD chronological age matches. CWID (moderate) recalled less than TD mental age matches but were as accurate. Interviewers should elicit CWID's recall as early as possible and consider developmental level and severity of impairments when evaluating eyewitness testimony. 相似文献
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IN REEENT YEARS，MUEH ATTENTION HAS BEEN PAID TO DIARYL一SUBSTITUTED HETEROEYELES THAT ARE ASSOEIATED WITH HIGH BIOLOGIEAL AETIVITIES AS SELEETIVE COX一2 INHIBI- TORS[L〕AND ANRITUMOR AGENTS[21.A NEW EOM卯UND， NAMELY4一{5一[3，4一DIMETHYL一5一(3，4，5一T 相似文献
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The enantioselective assay for S( )- and R(-)-propafenone (PPF) in human urine that developed in this work involves extraction of propafenone from human urine and using S( )-propafenone as internal standard, chiral derivatization with 2,3,4,6-tetra-O-β-D-glucopranosyl isothiocyanate, and quantitation by an RP-HPLC system with UV detection (λ=220nm). A baseline separation ofpropafenone enantiomers was achieved on a 5-μm reverse phase ODS column, with a mixture of methanol:water:glacial acetic acid (25:12:0.02,v/v) as mobile phase. There was good linear relationship from 24.9 ng/ml to 1875.0 ng/ml for both of enantiomers. The regression equations of the standard curves based on Cs-PPF (or CR-PPF ) versus ratio of As-PPF/As (or AR-PPF/As ) were y=0.0032x-0.081, (r=0.999) for S-PPF and y=0.0033x 0.0039, (r=0.998) for R-PPF,respectively. The method's limit of detection was 12.5 ng/ml for both enantiomers, and the method's limit ofquantitation was 28.2±0.52 ng/ml for S-PPF, 30.4±0.53 ng/ml for R-PPF (RSD＜8%, n=5). The analytical method yielded average recovery of 98.9% and 100.4% for S-PPF and R-PPF, respectively. The relative standard deviation was no more than 6.11% and 6.22% for S-PPF and R-PPF, respectively. The method enabled study of metabolism of S( )- and R(-)-propafenone in human urine. The results from 7 volunteers administered 150 mg racemic propafenone indicated that propafenone enantiomers undergo stereoselective metabolism and that in the human body, S( )-propafenone is metabolized more extensively than R(-)propafenone. 相似文献
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Meso-四-(3-5-二溴4-羟基苯)卟啉分光光度法测食品中铅含量 总被引：1，自引：1，他引：0
以食品为对象,研究了铅与Meso-四-(3-5-二溴-4-羟基苯)卟啉[T(DBHP)P]的配合反应,并对于溶液pH值、加热时间、表面活性剂用量、显色剂用量等对配合物的生成及稳定性的影响进行了探究,确定反应的最佳条件.经试验,当8-羟基喹啉存在时,铅在碱性条件下可与T(DBHP)P反应生成1:2的橙黄色化合物.该化合物在479 nm处有较强的吸收,当铅含量在0～12 μg/mL时,测得的曲线呈线性关系,服从比尔定律,重复性较好.经分光光度计测出其吸光度,绘制标准工作曲线,计算出铅的含量.结果表明:本实验所采用方法简便快速、安全,对环境污染小,且灵敏度较高,选择性较好,样品不需要分离出干扰离子,只需加入掩蔽剂即可消除钙离子和铁离子的影响.将该方法用于测定食品中铅的含量,取得了较满意的效果. 相似文献