地震勘探在采空区探测方面的应用

由于采空区及其上部地层相对于开采前的地层,其地球物理性质发生了显著变化,而地震勘探就是为了解决地下物性差异明显的构造,利用地震勘探对采空区进行探测,并取得了初步成效。通过两个地震勘探探测采空区的实例,并通过对勘探成果的验证结果,证明了地震勘探对采空区的勘探是有效的。     

裂化催化剂用BHS带滤机滤布的跑偏分析及纠正

对裂化催化剂洗涤过滤所用德国BHS带滤机滤布的跑偏原因进行了分析,剖析了现有纠偏器存在的问题,并根据其结构提出了比较理想的解决办法.     

聚烯烃/尼龙共混合金的研究进展

概述了马来酸酐接枝聚烯烃与尼龙共混合金的制备方法及最新的研究进展。     

Amorphous magnetic semiconductors with Curie temperatures above room temperature

Recently, amorphous magnetic semiconductors as a new family of magnetic semiconductors have been developed by oxidizing ferromagnetic amorphous metals/alloys. Intriguingly, tuning the relative atomic ratios of Co and Fe in a Co-Fe-Ta-B-O system leads to the formation of an intrinsic magnetic semiconductor. Starting from high Curie-temperature amorphous ferromagnets, these amorphous magnetic semiconductors show Curie temperatures well above room temperature. Among them, one typical example is a p-type Co_28.6Fe_12.4Ta_4.3B_8.7O₄₆ magnetic semiconductor, which has an optical bandgap of ~2.4 eV, room-temperature saturation magnetization of ~433 emu/cm³, and the Curie temperature above 600 K. The amorphous Co_28.6Fe_12.4Ta_4.3B_8.7O₄₆ magnetic semiconductor can be integrated with n-type Si to form p–n heterojunctions with a threshold voltage of ~1.6 V, validating its p-type semiconducting character. Furthermore, the demonstration of electric field control of its room-temperature ferromagnetism reflects the interplay between the electricity and ferromagnetism in this material. It is suggested that the carrier density, ferromagnetism and conduction type of an intrinsic magnetic semiconductor are controllable by means of an electric field effect. These findings may pave a new way to realize magnetic semiconductor-based spintronic devices that work at room temperature.     

Metal-organic framework composites for energy conversion and storage

Metal-organic frameworks (MOFs) with orderly porous structure, large surface area, high electrochemical response and chemical tunability have been widely studied for energy conversion and storage. However, most reported MOFs still suffer from poor stability, insufficient conductivity, and low utilization of active sites. One strategy to circumvent these issues is to optimize MOFs via designing composites. Here, the design principle from the viewpoint of the intrinsic relationships among various components will be illuminated to acquire the synergistic effects, including two working modes: (1) MOFs with assistant components, (2) MOFs with other function components. This review introduces recent research progress of MOF-based composites with their typical applications in energy conversion (catalysis) and storage (supercapacitor and ion battery). Finally, the challenges and future prospects of MOF-based composites will be discussed in terms of maximizing composite properties.     

CSP低碳铝镇静钢水可浇性控制

通过钢液-夹杂物的热力学基本理论,利用活度相互作用系数和Bjorkvall方法分别计算了CSP流程低碳铝镇静钢中钢和夹杂物的成分,详尽地分析了CaO-Al₂O₃二元系中中间相3CaO·Al₂O₃,CaO·Al₂O₃,液态12CaO·7Al₂O₃和CaS夹杂的热力学性质,同时分析了钙处理过程中生成液态铝酸钙夹杂物,避免CaS夹杂析出的条件.模型的结果与工厂试验结果相符合.     

丹参内生真菌产生淀粉酶菌株的筛选鉴定及酶学性质分析

目的:从丹参内生真菌中筛选耐热性强的酸性生淀粉酶菌株,并对其酶学性质进行初步研究。方法:以50株丹参内生真菌作为筛选对象,通过淀粉固体培养基初筛、液体发酵复筛,筛选产生淀粉酶活力较高的菌株;通过形态学观察和ITS序列分析对产酶菌株进行鉴定。结果:从50株丹参内生真菌中,筛选出5株产生淀粉酶活力较高的菌株,其中菌株ZDH2-2-1-1为产淀粉酶活性最强的菌株,酶活力达到117.63 U/m L,经鉴定为互隔链格孢（Alternaria alternata）。该淀粉酶最适p H为4.0,最适反应温度为55℃,具有较好的热稳定性和p H稳定性,对生淀粉具有广谱的降解能力。通过薄层层析发现,ZDH2-2-1-1所产淀粉酶的酶解产物为葡萄糖。结论:丹参内生真菌能产生高活性的耐热性酸性生淀粉酶,在生淀粉深加工中具有极大的开发潜力。      

雾化植物精油对鼠伤寒沙门氏菌抑制效果和樱桃番茄品质的影响

本研究的目的是评测雾化液态植物(芥末、肉桂、牛至和百里香)精油对樱桃番茄表面和茎端的抑菌效果及对果实品质的影响。将樱桃番茄的表面和茎端分别接种鼠伤寒沙门氏菌(ATCC 53467和ATCC 5 3468菌种),晾干之后放到包装盒中,采用加湿器来雾化液态的植物精油,然后通过一根PE管导入到装有已经接种了鼠伤寒沙门氏菌的樱桃番茄的包装盒中。处理后的果实存放在10℃的冰箱中3个星期,存放期间每隔1个星期进行微生物指标测定,不接菌种的果实用来测定果实品质指标。结果表明,雾化的植物精油能够显著的抑制樱桃番茄表面和茎端的鼠伤寒沙门氏菌(表面及茎端菌落分别降低2.00 log CFU/fruit和1.00 log CFU/fruit左右)。随着贮藏期的延长,菌落总数也随之降低,这证明其抑菌效果仍然有效。雾化植物精油杀菌处理对果实硬度,颜色,VC等品质指标没有显著影响(p>0.05)。雾化是一种方便有效的可用于储存或运输果蔬产品消毒的新方法。      

活络模花纹块TIR检测仪的设计及应用

花纹块TIR检测仪是子午线轮胎活络模具大型精密的专用检测设备,该技术在活络模具花纹块检测中的应用,表志着我国子午线轮胎模具的整体制造水平已步入了世界先进行列,它不仅提高了模具的检测水平,而且为检测人员准确、高效地完成其测量任务提供了便利.     

化工企业厂址选择的定性分析与定量分析

论述了化工企业厂址选择的定性分析与定量分析方法.在定性分析方法中,着重讨论了可持续发展、厂址选择与城市规划的关系、卫生防护距离、节约土地资源、工程地质、运输大环境等问题;在定量分析方法中,阐述了把目标因素转化为费用因素的分析方法.