Evolutionary topology optimization of the lower stable of a hydraulic press

It is difficult to obtain the globe optimum solution by applying conventional sizing and geometrical optimization methods. Evolutionary topology optimization is conducted for the lower stable of a hydraulic press using a bi directional evolutionary structure optimization (BESO) method based on ratio of stress changes, and the evolutionary history and index are analyzed. The presented algorithm obtains the simultaneous optimization on both geometry and topology, and a new topology of the lower stable of the press is evolved which possesses a reasonable topological structure. The results of finite element analysis show that the new structure has decreased maximum stress, uniform stress distribution and good material usage.     

综合保鲜技术对贮藏柿果品质的影响

以无核甜柿为原料,按L16(44×23)正交设计, 采用乙烯抑制剂、乙烯吸收剂、涂膜剂、CO2释放剂、脱氧剂等综合保鲜技术对柿果进行处理,用不同的方式保鲜贮藏,研究了柿果贮藏后鲜果率、可溶性固形物、维生素C含量、单宁含量的差异.筛选出A3B4C3D4E2F1为保持柿果品质的最优柿果综合保鲜技术工艺.     

Synthesis of cobalt phthalocyanine under microave irradiationand determination of bovine albumin

Cobalt phthalocyanine （CoPc）was prepared from phthalodinitrile and cobalt sulfate via microwave irradiation. The Resonance Rayleigh scattering（RRS）was enhnaced by the interaction of sulfonated CoPc and bovine albumin（BA）. An RRS peak formed at 460 nm with intensity proportional to the concentration of BA. A simple and rapid method of RRS for the determination of BA thus was established. The linear range is 0.1 ug/mL to~6.0 ug/mL. The detection limit for BA is 5.73 ng/mL.     

An accumulation heat model and its application in iron ore sintering

An auto accumulation heat model of material beds was constructed with reference to the iron ore sintering process. The effects of the thickness of the combustion layer and the heat distribution ratio in material beds were studied. Simulation results show that the heat of the material beds declines as the combustion layer thickness increases and heat increases as the distribution of calories in the preheating layer increases. Dividing the 300 mm bed into 3 layers, the ratio of heat accumulation in the upper, middle and lower beds is 1∶1.08∶1.13. When the model is applied to the rational distribution of sintering fuel under laboratory conditions, the amount of fuel used is reduced.     

基于机器视觉的鸡蛋体积与表面积计算方法

鸡蛋体积与表面积传统手工检测方法速度慢、效率低,不能满足实际生产的需求.利用机器视觉技术,假设理想鸡蛋图像关于纵径对称,提出像素体积和Vp与像素表面积和Sp,给出在数字图像中的计算方法;最后建立了鸡蛋体积V、表面积S与Vp、Sp之间的关系模型.试验验证表明:鸡蛋体积预测模型相关系数为0.965,实测误差±1 cm3内准确率达92%;鸡蛋表面积预测模型相关系数为0.971,实测误差±1 cm2内准确率达88%.     

微热光电系统中多孔介质燃烧室性能试验

为优化燃烧室,设计加工了内径2.4 mm、外径3.0 mm的多种不同孔隙率的多孔介质结构微燃烧室,并在燃烧室内实现了氢氧混合气的稳定燃烧.改变氢氧体积混合比和混合气入口流量,对多孔介质微燃烧室进行了相关试验,分析了各种条件下微燃烧室的燃烧情况及外壁面的温度分布.研究结果表明,这些因素对混合气在微燃烧室内的燃烧有重要影响.多孔介质燃烧室在孔隙率为0.50,混合气入口流量为750 cm3/min,氢氧体积混合比为2∶1时燃烧效果较好,外壁面温度高且分布均匀,适合微热光电系统的应用.     

苎麻品种“赣苎3号”下胚轴愈伤组织诱导及分化的研究

以苎麻品种"赣苎三号"种子萌发的无菌苗的下胚轴为外植体,通过研究不同培养基、不同生长调节物质对苎麻种子萌发、下胚轴愈伤诱导、不定芽的发生和生根的影响,筛选出以"赣苎3号"下胚轴为外植体的组织培养再生体系。结果表明:1/2 MS+TDZ 0.5 mg/L+IAA 0.01 mg/L+2,4-D 0.03 mg/L+CH 500 mg/L+蔗糖30 g/L+琼脂7 g/L为最佳种子萌发培养基,种子萌发率为77%。1/2 MS+TDZ 0.3 mg/L+IAA 0.03 mg/L+2,4-D 0.02 mg/L+CH 300 mg/L+蔗糖30 g/L+琼脂7 g/L为愈伤组织诱导及分化最佳培养基,愈伤率为98%,出芽率为51%。1/2 MS+蔗糖15 g/L+琼脂7.5 g/L为愈伤苗的最佳生根培养基,生根率为100%。     

新型杀菌剂 25%越库和25%捷托

<正>浙江永农化工有限公司致力于发展有益于环境,有益于健康的优质、高效、安全、无公害的作物保护系列产品,大力开发可持续发展的新产品、新技术,以满足不断增长的市场需求。现拥有杀虫剂、杀菌剂、除草剂三大系列产品,产品结构日趋完善。自主生产草铵     

乐清市菜地土壤养分及重金属污染状况调查研究

乐清市主要常年菜地土壤耕作层和蔬菜可食用部分取样分析结果表明，菜地土壤速效养分含量丰富，土壤镉（Cd）污染严重，铜（Cu）污染次之，锌（Zn）污染稍轻，部分种类的蔬菜可食用部分镉、铜等含量严重超标。     

紫外光（UV-C）处理对库尔勒香梨采后病斑扩展和抗病性的影响

以库尔勒香梨为材料,用紫外光（UV-C）照射处理,接5交链孢（Alternaria altetnata）,研究 UV-C 处理对病斑扩展和香梨抗病性的影响.香梨采后用7.5 kJ/m2的 UV-C照射39 min,处理24 h 后,接5交链孢（A．al-ternata）,贮藏于低温条件下（-1℃,相对湿度95％）,测定A．alternata 病斑直径及果实抗性相关的酶活性.结果表明,UV-C处理可显著降低果实损伤接5 A．alternata 的发病率及病斑扩展直径（P ＜0.05）,提高果实过氧化物酶（POD）、苯丙氨酸解氨酶（PAL）的活性,抑制几丁质酶（CHT）和β-1,3葡聚糖酶（GLU）活性的下降,显著提高果实总酚含＆lt;（P ＜0.05）.UV-C处理可提高香梨采后果实抗病相关酶的活性,抑制果实黑斑病的发展.