黑盒子的制作与测试方法的研究

黑盒子实验由于其所用的元件较少,制作简单。但变化十分丰富,可以制成很多不同的结构,是国内国际物理竞赛的一种常见问题,亦是大学生的选做实验。充分做好了黑盒子实验就相当于透彻的理解了各电子元件的基本性质。本文通过对各种电学元件的分析,总结出各元件的基本性质,从而在对黑盒子内的元件测量时加以分析比较,以判断出黑盒子内的元件种类。     

The geometric morphometrics and condition of Pontic shad,Alosa immaculata (Pisces: Clupeidae) migrants to the Danube River

Anadromous fish could have intraspecific groups with different life histories; identification of these is very important for management and conservation. Geometric morphometrics represents a quick and cost-effective method to identify such intraspecific groups. In this study, geometric morphometrics of Pontic shad (Alosa immaculata) migrants from the Danube River were investigated, as was Fulton's condition factor (K), hepatosomatic index (HSI) and gonadosomatic index (GSI). Pontic shad specimens were collected during April and May of 2004 and 2006. The sample comprised four groups (65 males and 56 females in 2004; 110 males and 78 females in 2006). Geometric morphometrics revealed differences in shape that were statistically significant for both year (nested analysis of variance: F = 13.84; p < 0.001) and sex (nested analysis of variance: sex nested in year, F = 1.71; p < 0.01). The major differences between years were in head shape and position of fins. The most significant difference between females and males was in the dorsolateral expansion of the mid-body section with emphasis on the higher dorsal part of the body. Values for K in this work (0.65–0.70) were the lowest recorded for Pontic shad in the Danube River. Additional investigations involving both geometric morphometrics and molecular genetics are necessary to confirm the presence of races. This could be important information for conservation purposes as Pontic shad is listed as Vulnerable on the International Union for Conservation of Nature list.     

黑豚毛虱形态学研究

对黑豚体表毛虱进行了调查和研究，发现黑豚体表有寄生有大量的毛虱，在显微镜下对黑豚毛虱的形态结构进行观察，并用显微测量法测量其头、胸、腹等有关结构的长度，经鉴定为黑豚毛虱（Damalinia black），属食毛目（Mallophasa）、毛虱科（Trichodectidae）、毛虱属（Damalinia）.     

黑豚体表毛虱调查及防治的研究

对黑豚体表毛虱进行了调查和研究,发现黑豚体表有大量的毛虱,经鉴定为黑豚毛虱(Damalinia black),属食毛目(Mallophaga)、毛虱科(Trichodectidae)、毛虱属(Damalinia).并选用4种药物(溴氰菊酯、阿维菌素、百部、螨净)进行防治.结果溴氰菊酯、阿维菌素对黑豚毛虱驱杀效果达100%.     

从恒星的演化到宇宙模型

恒星要保持相对平衡,必须要有某种压力与引力抗衡,在核心处必须存在某种能量来源。恒星的一生是不断消耗能量的一生,一旦能量消耗殆尽,将演变为白矮星、中子星或者黑洞。从理论上讲,黑洞的中心称为奇点,从量子场论的观点推测,奇点也许是“真实”与“虚无”的连接点,或者说“开关”。     

Fijiensin,the first phytotoxin fromMycosphaerella fijiensis,the causative agent of Black Sigatoka disease

Summary Fijiensin, a novel phytotoxic metabolite, was isolated from a culture of the fungusMycosphaerella fijiensis, the causal agent of Black Sigatoka disease of banana. Fijiensin is phytotoxic on various banana cultivars, but not toward non-host plants. The structure of fijiensin was determined by X-ray analysis.     

黑白花乳牛关节滑膜炎的研究Ⅱ．实验性腕关节滑膜炎疗效的关节滑液动态检测评价

以７头１岁龄健康黑白花乳牛的７个左腕关节作为对照组，７个右腕关节作为治疗组，在第０天采取全部正常腕关节滑液（ＳＦ）及血液样品，同时进行两性霉素Ｂ关节内注射诱发１４个腕关节的急性浆液性腕关节滑膜（ＡＳＣＳ），然后分别在第２（４８小时）、７、１２、２２天进行四次采样待检．治疗组在第二、三采样时（第２、７天）分别进行一次关节注射治疗，治疗药物为醋酸强的松龙７５ｍｇ与普鲁卡因青霉素５０万单位的混合液，ＳＦ成分动态检测结果表明，试验牛ＡＳＣＳ时急剧变化的滑液细胞计数（ＴＣＣ）、总蛋白（ＴＰ）及各组分、乳酸脱氢酶（ＬＤＨ）、碱性磷酸酶（ＡＬＰ）、γ－谷氨酰转肽酶（γ－ＧＴ）等成分含量迅速恢复正常，对照组恢复缓慢，治疗组与对照间存在显著差异（Ｐ＜０．０１或０．０５），疗效显著，各血清成分动态测定值无明显变化（Ｐ＞０．０５）．关节滑液的动态控制，对关节炎症的治疗效果评价客观、准确、可靠，并有助于准确判断关节局部代谢状况及关节炎症的进程和预后     

铬黑T与几种氧化剂反应过程的探讨

本文用铬黑T在稀盐酸中于室温下与IO_4、IO_3~-及CrO_4~(2-)进行反应,反应后用NH_3·H_2O-NH_4Cl缓冲溶液调至pH为9.3～9.7左右,使剩余铬黑T转化成纯兰色,借测定反应前后616nm.处吸光度的减小来探讨铬黑T与氧化剂反应的历程.结果得知铬黑T被氧化时一式量失去6个电子.     

东西方意识流融合的杰作--评张承志的《黑骏马》

张承志的《黑骏马》是东西方意识流手法融合的杰作。作品中不仅有西方意识流的自由联想、内心独白、象征主义和音乐化手法的典型体现，更有意识流东方化特有的心灵之感与自然之象交融、情节淡化与情结探寻结合、当代意识与民族传统互渗等手法的独特体现。