工厂化养猪中的生产静态分析

工厂化养猪中的生产静态分析是指在一定时间内各分场（分区）各项养猪指标上的对比分析，是猪群生产分析的重要组成部分，主要包括种猪存栏对比、各类猪存栏对比、公母猪配种对比、母猪产仔断奶对比、乳仔猪死亡对比、大中猪死亡淘汰对比、种猪死亡淘汰对比等几个部分。     

关于Java作为大学基础课程开设的探讨

阐述了Java语言作为大学基础课程开设的必要性,介绍了开设Java课程的难度,分析了Java课程开设的可行性,并通过具体模型设计给出开展互动式Jaya教学的方法,为非计算机专业学习Java提供了一套完整的教学方案。     

渔业资源评估中的回顾性问题

回顾性问题是指,随着渔业数据逐年加入,渔业资源评估结果如资源量或捕捞死亡系数等出现系统性偏差。多种渔业资源应用不同评估模型进行渔业资源评估,其结果常存在回顾性问题,这使得渔业资源评估的结果存在不确定性,不利于渔业资源合理的管理与开发,因此,回顾性问题是目前渔业资源评估研究中的热点与难点之一。回顾性问题的度量目前主要采用MOHNρ,产生回顾性问题的原因主要可归纳为数据错误与模型假设错误。目前,尽管有多种方法用于诊断、分析回顾性问题的成因,但这些方法均存在局限性。针对回顾性问题,渔业资源评估学者根据其研究对象的特点提出了校正回顾性问题的方法,但目前仍缺乏通用的方法或手段以校正或避免回顾性问题。在渔业资源评估中,若结果存在回顾性问题,则表明数据或模型假设存在问题。因此进行回顾性分析,是评估数据质量及检查数据与模型假设是否一致的有效手段。     

Cosmic-ray record in solar system matter

The energetic nuclei in cosmic rays interact with meteoroids, the moon, planets, and other solar system matter. The nuclides and heavy nuclei tracks produced by the cosmic-ray particles in these targets contain a wealth of information about the history of the objects and temporal and spatial variations in the particle fluxes. Most lunar samples and meny meteorites have complex histories of cosmicray exposure from erosion, gardening, fragmentation, orbital changes, and other processes. There appear to be variations in the past fluxes of solar particles, and possibly also galactic cosmic rays, on time scales of 10(4) to 10(7) years.     

宁夏鸟类4种新纪录

对宁夏银川境内的鸟情进行调研,在调研过程中采集和见到反嘴鹬(Recurvirostra avosetta)、白头鹎(Pycnonotus sinensis)、燕雀(Fringilla-montifringilla)、黑尾塍鹬(Limosa limosa)4种宁夏新纪录.其中采集到白头鹎、燕雀、黑尾塍鹬的标本,观察到反嘴鹬并拍照.     

Insect diversity in the fossil record

Insects possess a surprisingly extensive fossil record. Compilation of the geochronologic ranges of insect families demonstrates that their diversity exceeds that of preserved vertebrate tetrapods through 91 percent of their evolutionary history. The great diversity of insects was achieved not by high origination rates but rather by low extinction rates comparable to the low rates of slowly evolving marine invertebrate groups. The great radiation of modern insects began 245 million years ago and was not accelerated by the expansion of angiosperms during the Cretaceous period. The basic trophic machinery of insects was in place nearly 100 million years before angiosperms appeared in the fossil record.     

宁夏鸟类4种新纪录

对宁夏银川境内的鸟情进行调研,在调研过程中采集和见到反嘴鹬（Recurvirostra avosetta）、白头鹎（Pycnonotus sinensis）、燕雀（Fringilla-montifringilla）、黑尾塍鹬（Limosa limosa）4种宁夏新纪录.其中采集到白头鹎、燕雀、黑尾塍鹬的标本,观察到反嘴鹬并拍照.     

河南种子植物区系分布新记录

报道了河南植物区系种子植物２新记录属（Ｅｕｐｈｒａｓｉａ,Ｃｒａｓｓｏｃｅｐｈａｌｕｓ）,１４新记录种和１新记录变种。     

湖南被子植物分布新记录

2013––2014年在湖南南岳衡山发现了浙江乳突果(Adelostemma microcentrum Tsiang)、小叶冷水花(Pilea microphylla(L.)Liebm.)、南方兔儿伞(Syneilesis australis Ling)、白花鬼针草(Bidens pilosa L.var.radiata Sch.–Bip.)、密苞叶薹草(Carex phyllocephala T.Koyama)和中国石蒜(Lycoris chinensis Traub)等共6个湖南省被子植物新记录种(其中5个种,1个变种,隶属5个科,6个属,乳突果属Adelostemma为湖南省新记录属),并拍摄了其植物照片,采集了其植物标本,凭证标本均存放于湖南省南岳树木园标本室。     

Mass extinctions in the marine fossil record

A new compilation of fossil data on invertebrate and vertebrate families indicates that four mass extinctions in the marine realm are statistically distinct from background extinction levels. These four occurred late in the Ordovician, Permian, Triassic, and Cretaceous periods. A fifth extinction event in the Devonian stands out from the background but is not statistically significant in these data. Background extinction rates appear to have declined since Cambrian time, which is consistent with the prediction that optimization of fitness should increase through evolutionary time.     

甘肃省蝶类新记录

2007~2014年,在迭部县境内采集蝴蝶标本3000余份,经鉴定有甘肃省蝶类新记录18种,隶属于6科17属.灰蝶科最多,有7种,其次是眼蝶科5种,蛱蝶科3种,凤蝶科、粉蝶科和弄蝶科各1种.     

河南蕨类植物分布新记录

报道河南植物区系蕨类植物3新记录属(rVandenboschia Cop.,Microlepia Presl,calliptris Bory)，9新记录种。     

河南被子植物分布新记录

报道河南植物区系被子植物1新记录属(Cheilotheca Hook.f.),10新记录种,3新记录变种．