惠斯通电桥的系统误差

本文对惠斯通电桥的系统误差作了分析讨论,在此基础上提出了减少系统误差以提高测量结果准确度的有效方法.     

从北大教员到乡村教师

抗战时期，废名回到家乡黄梅躲避战乱，这期间，他受聘为黄梅县第二小学教员，做了半年的小学国语教员。他见证了“计划教育”背景下黄梅县的教育历史，并在“二小”进行了一场围绕“写什么”和“怎么写”的教学改革。废名的教学改革思想实质上同五四新文化运动有丰富的联系，为黄梅教育吹进了新气息。     

二甲双胍联合抗阻运动对糖尿病大鼠下丘脑TGF-β1-Smad2/3的影响

目的:探究二甲双胍联合抗阻运动干预对糖尿病大鼠的血糖的影响,以及对下丘脑TGF-β1、Smad2/3含量的影响。方法:采用高糖高脂饲料喂养结合腹腔注射链脲佐菌素(Streptozocin,STZ)注射液诱导糖尿病大鼠模型,二甲双胍和抗阻爬梯干预,Western-Blot法检测糖尿病大鼠下丘脑TGF-β1、Smad2/3蛋白表达量。结果:二甲双胍和运动均有一定降血糖效果,以药物治疗最为明显,联合干预的效果低于单独干预;二甲双胍和抗阻运动干预及其联合干预,Smad2/3、TGF-β1表达无明显的改变。结论:6周的糖尿病进程可能没有损伤大鼠下丘脑,抗阻运动和二甲双胍药物干预降低糖尿病大鼠血糖可能存在一定的抵消作用。     

Maximal intended velocity training induces greater gains in bench press performance than deliberately slower half-velocity training

Abstract

The purpose of this study was to compare the effect on strength gains of two isoinertial resistance training (RT) programmes that only differed in actual concentric velocity: maximal (MaxV) vs. half-maximal (HalfV) velocity. Twenty participants were assigned to a MaxV (n = 9) or HalfV (n = 11) group and trained 3 times per week during 6 weeks using the bench press (BP). Repetition velocity was controlled using a linear velocity transducer. A complementary study (n = 10) aimed to analyse whether the acute metabolic (blood lactate and ammonia) and mechanical response (velocity loss) was different between the MaxV and HalfV protocols used. Both groups improved strength performance from pre- to post-training, but MaxV resulted in significantly greater gains than HalfV in all variables analysed: one-repetition maximum (1RM) strength (18.2 vs. 9.7%), velocity developed against all (20.8 vs. 10.0%), light (11.5 vs. 4.5%) and heavy (36.2 vs. 17.3%) loads common to pre- and post-tests. Light and heavy loads were identified with those moved faster or slower than 0.80 m·s^?1 (～60% 1RM in BP). Lactate tended to be significantly higher for MaxV vs. HalfV, with no differences observed for ammonia which was within resting values. Both groups obtained the greatest improvements at the training velocities (≤0.80 m·s^?1). Movement velocity can be considered a fundamental component of RT intensity, since, for a given %1RM, the velocity at which loads are lifted largely determines the resulting training effect. BP strength gains can be maximised when repetitions are performed at maximal intended velocity.     

Passing,Protesting, and the Arts of Resistance: Infiltrating the Ritual Space of Blood Donation

This essay critically engages challenges made against the federally mandated deferral policies which prohibit “men who have sex with other men” from donating blood. I argue that “passing” and “protest” are dialogically dependent on one another as two separate but related tactics of resistance. Drawing on interview materials from men who have both “passed” and “protested,” the essay explores the implications of this dialogical tension for understanding stranger-relationality, enacting civic identity, and disciplining queer bodies.     

“政治-文学”家二重身份下的抗战表达——论罗烽抗战时期的小说创作

“东北作家群”的重要成员罗烽因“政治－文学”家的二重身份,使其抗战时期的小说创作显示出高度理性,充分强化了抗战文学的政治功利性。具体表现为：痛斥日本殖民者罪行、煽动反帝情绪;发掘民族精神韧力、支撑抗争意志;全面观照战争环节,呼吁抗战理智;刻意营造冷峻文风,激发危机意识。     

抗战时期日本对蒙疆地区留日学生政策述论

抗日战争爆发后,日本政府和军部为实现长期占领和控制内蒙古地区的战略目的,不仅出兵扶持锡林郭勒盟苏尼特右旗札萨克郡王德穆楚克栋鲁普即德王建立伪蒙疆政权,而且以对日感情、出身、民族、宗教、资质和学习成绩等作为选拔标准,通过伪政权强制选派了一批批的青年学生和喇嘛赴日留学,借机灌输亲日反华仇苏思想,培养日蒙亲善分子和开发内蒙古资源的各类技术人才,并将“学成”回国的留日学生安插到配合日本内蒙政策的各种工作岗位上,以服务于日本的侵略战争政策。     

抗战时期绥西的合作农场

抗战时期绥西合作农场,作为民生经济合作体制的重要组成部分,其创办源于1940年绥西的土地整理。当时,绥远省政当局为增加战时生产以配合军事胜利,运用国家政权的力量,对经土地整理丈余公田及取缔包租转租的蒙地。五十顷以上者交由省合作事业处组建合作农场经营。这一举措既促使绥西的传统农业向近代农业转化,又为抗战能得以坚持提供了经济保障。然其依旧是一个农村经济革故鼎新进程中的量变阶段。     

浅谈降低接地装置接地电阻的几种措施

根据通信电力网中接地引起的电网事故,就降低接地装置的接地电阻进行了探讨,并提出了建设性意见.     

Why do users resist service organization’s brand mobile apps? The force of barriers versus cross-channel synergy

Service organizations increasingly develop brand apps (mobile applications) to expand service channels to the mobile end. Attracting their customers to install the brand app is critical. But there is widespread resistance to brand apps. This resistance can be classified as postponement, opposition and rejection. This study explores consumers’ active resistance of brand app in service organization. We examine the effects of adoption barriers and knowledge of alternatives quality on the three resistance behaviors and moderating effects of satisfaction with off-line service. The results show three resistance behaviors are affected by different reasons, and cross-channel synergy exists. Our study extends the theoretical understanding of the antecedents of and cross-channel influences on resistance to brand apps, with practical implications that managers should adopt different strategies for postponers, opponents and rejecters.