浅析黑龙江省林业产业结构优化调整对策

合理的产业结构会带动经济的快速发展,促进自然资源的合理利用,对于保持生态平衡有非常大的推动作用。文章在我省现有林业产业结构分析的基础上,通过建立林业产业园区,发展林下经济以及大力发展旅游及其相关产业的林业产业结构调整对策。     

蔬菜农药残留检测中基质效应影响因素分析

为了提高农药检测的准确率,试验选择气相色谱(7890A、1310)与气相串联质谱(GCMS-MS)3种不同仪器,结球白菜、结球甘蓝、黄瓜、辣椒4种蔬菜样品及其基质标准溶液和正己烷溶剂标准溶液,对4种不同蔬菜中分别添加腐霉利、甲氰菊酯、氯氰菊酯、溴氰菊酯4种农药并进行回收校正,比较不同的校正溶液、不同仪器以及不同的样品类型对蔬菜农药残留检测中的基质效应的影响。结果显示:按不同基质标准溶液和溶剂标准溶液校正的检测结果分类,不同蔬菜、不同的标准校正溶液对于农药残留检测中的基质效应表现出多样性和复杂性的特点。但采用与本底一致的基质标准溶液校正样品可有效消除基质效应。按不同仪器检测结果分类,气相色谱(7890A、1310)与气相串联质谱(GC-MS-MS)基质效应的影响存在一定的差异,GC-MS-MS存在较为明显的基质增强效应;而同类仪器(7890A、1310)之间基质效应的影响较小。     

家装业定制家具设计与计算机集成制造系统中的问题探析

定制家具已经成为追求个性化和私密家居环境者的一个方向,但其多变性较强,在工业化生产过程中很难实现“无缝式”衔接,从而导致部分家装业定制家具的设计方案与家具产品之间产生差异。介绍了家装业定制家具的主要特征,论述了计算机集成制造家具的基本模式,具体分析了家装业定制家具设计与计算机集成制造系统中的衔接问题,有针对性地提出优化家具设计与计算机制造系统衔接的三项措施。     

Advances on Detection Methods for Residues of Nitrofurans in Food

Nitrofurans are broad-spectrum antibiotics which have been widely used in food animals to the prevention and treatment of gastrointestinal infections.Due to abuse of drugs by criminals,animals could produce drug-resistant strains,which reduces the role of antibiotics.Meanwhile,excessive drugs residues in food has carcinogenic,teratogenic and mutagenic effects to the human body.In this paper,the damage and the detection methods of the residues of the nitrofurans in food are surveyed.The main detection methods include high performance liquid chromatography,liquid chromatography-mass spectrometry,liquid chromatography tandem mass spectrometry,enzyme-linked immunoassay,colloidal gold immunoassay and fluorescence immunity analysis method.The research status of various detection methods are summarized and the suggestions for further research are put forward.It is expected to provide reference for future research.     

香港人工林改造对林下植物自然更新 和物种多样性的早期影响

以嘉氏羊蹄甲（Bauhinia galpinii）种子为材料，开展了不同浸种催芽处理对比试验。结果表 明，相比不浸种处理，3 个浸种处理明显提高嘉氏羊蹄甲的种子发芽势和发芽率，平均苗高也明显高于不 浸种组，其中，温水(60 ℃ ) 浸种6 h 组嘉氏羊蹄甲种子发芽率最高，达74.7%，苗高生长最快。     

多自由度剑麻收割机的设计与仿真制造

剑麻是一种广泛使用的硬质纤维的主要来源,被广泛的运用到各种行业,需求极大;但其收割现以手工为主,且因剑麻自身带有刺,加大了收割的难度,降低了效率。为解决剑麻的纯手工收割收割困难以及效率低的问题,提出一种多自由度剑麻收割机的机械,并申请了国家发明专利,得到授权。本文将运用UG、Sdams以及Mat Leb对该机械进行改进设计与仿真分析,并试制实物机械进行试验。试验结果表明:该机实现了剑麻收割的半自动化并提高剑麻收割的效率,可满足现行各行各业对剑麻的需求量。     

The innovation effect of low-carbon technology transfer from the perspective of carbon emission reduction demand: A case study of the Yangtze River Economic Belt in China

Reducing carbon emissions is the only way to solve the global climate problem, which obviously requires the joint efforts of all regions. From the perspective of carbon emission reduction demand, this research obtains the data of low-carbon patents and CO₂ emissions from 2000 to 2019, and then explores the innovation effect of low-carbon technology transfer in the Yangtze River Economic Belt (YREB). We draw the following conclusions: (1) Low-carbon technology transfer has a positive impact on low-carbon technology innovation. However, a large number of low-carbon technology transfers are concentrated between developed regions in the YREB at present. (2) No matter from the perspective of total amount or efficiency, carbon emission reduction demand can play positive moderating role in the process of exerting the innovation effect of low-carbon technology transfer, indicating that the transfer of low-carbon technologies to regions with high demand is efficient. (3) The moderating effect of carbon emission reduction demand in different regions has regional heterogeneity. Carbon emissions per unit of GDP plays a greater role in moderating the innovation effect of low-carbon technology transfer in the eastern region, while CO₂ emissions plays a greater role in the central and western regions. Therefore, we propose to strengthen the transfer of low-carbon technologies between developed and less-developed regions, and adopt differentiation strategies according to the actual situation of each region. Our research has deepened the understanding of environmental economic geography on the innovation effect of low-carbon technology transfer, and has reference significance for global low-carbon technology cooperation.     

Cloning and Sequence Analysis of Complete Genome of Porcine Circovirus Type 2 from Liaoning Province

It was aimed to lay a foundation for epidemiological survey of porcine circovirus type 2(PCV2) in Liaoning province and selection of highly homologous strain inactivated vaccine.Some pigs suspected of having postweaning multisystemic wasting syndrome (PMWS) from Shenyang,Chaoyang,Tieling,Dalian and other places in Liaoning province,were detected by PCR method,then the whole genome of 10 positive samples were cloned and sequenced.The result showed that all of them were virulent strains,9 strains were 1767 bp and 1 strain was 1768 bp,and there was a T base additon at 1039 bp.The nucleotide homology was 95.1% to 98.5% with HM038034 and JQ692110.In the phylogenetic tree,JHZ2 was PCV2a type,the other 9 strains were PCV2b type,DLS38,LYD32 and SYX7 were in the same branch and same onset time.The amino acid homology of ORF2 was 89.6% to 100.0%,there were 35 mutation points,large degree of variation,the only glycosylation site (NYS) was conserved.10 strains did not change significantly,mutants were not due to PCVD,PCV2b was the predominant type,and PCV2 was related with seasonality.