中国煤层气产业的利用现状和战略发展初探

从时代要求、国家需要、可持续发展的"大环境"、"小气候"等方面,阐明了我国开发煤层气的必要性,论述了在我国发展煤层气产业的有利条件和不利因素,指出国家要加大对煤层气开发新技术及新装备研发与产业发展政策的支持力度,提出了煤层气的开发方式、方法和"先采气、后采煤、跨越发展、合作与竞争"的战略构想以及到2010年、2020年、2050年产量的战略目标。     

Light amplified oxidative stress in tumor microenvironment by carbonized hemin nanoparticles for boosting photodynamic anticancer therapy

Photodynamic therapy (PDT), which utilizes light excite photosensitizers (PSs) to generate reactive oxygen species (ROS) and consequently ablate cancer cells or...     

多切削刃金刚石颗粒烧结试验研究

为提高金刚石工具的锋利度和加工效率,延长其使用寿命,采用低温烧结的方法对金刚石颗粒表面进行多刃化处理。使用扫描电镜照片和质量损失率对不同烧结工艺的金刚石颗粒多刃化效果进行表征,并进行了碳化硅晶片研磨试验。结果表明:金刚石颗粒多刃化处理的最佳烧结工艺为:烧结温度750 ℃,烧结时间480 min,期间通10 kPa氧气2次,每次通气2 min,通气间隔2 h。在此条件下可获得大小适中,凹坑分布均匀的多刃化金刚石颗粒表面。碳化硅晶片研磨试验证明:多刃化金刚石颗粒与常规金刚石颗粒相比,材料去除率可提高1.1倍,研磨后晶片表面粗糙度R_a约为常规金刚石颗粒的24%,多刃化处理可显著提高金刚石颗粒研磨碳化硅晶片的抛光效率和精度。      

冷轧钛带卷裂纹缺陷分析

对冷轧钛带卷典型裂纹缺陷进行了统计分类,采用化学分析、能谱分析、电镜扫描、硬度检测、金相组织观察对裂纹缺陷进行分析,揭示了冷轧钛带卷裂纹缺陷产生的原因.结果表明,钛卷基体铁元素、氧元素、氮元素含量偏高均可导致冷轧钛带卷出现裂纹缺陷.     

Effect of Welding Method on Microstructure and Mechanical Properties of L360QS/N08825 Composite Pipe Welded Joint

Transactions of the Indian Institute of Metals - The effects of manual tungsten inert gas welding (GTAW) and automatic GTAW on the microstructure and mechanical properties of L360QS/N08825...     

In Situ Synthesis of the Peapod-Like Cu–SnO2@Copper Foam as Anode with Excellent Cycle Stability and High Area Specific Capacity

The theoretical specific capacity of tin oxide (SnO₂) anode material is more than twice that of graphite material (782 vs 372 mAh g^–1), whereas its potential usage is limited fatally by its huge volume expansion during lithiation. An effective solution is to encapsulate tin oxide into hollow structure such as yolk-shell based on the principle of confinement. However, in light of the restricted space of active substance, this kind of hollow electrode always has the low capacity, severely limiting its commercial value. Herein, a peapod-like Cu-SnO₂@copper foam (CF) as high area specific capacity anode based on the Kirkendall effect, in which the “pod and peas” in the peapod-like structure are composed of SnO₂ and Cu nanoparticles, respectively, is tactfully designed and constructed. Compared to other SnO_x-based electrodes with different hollow structure designs in published reports, the unique peapod-like Cu-SnO₂@CF anode delivers a remarkably high first reversible capacity of 5.80 mAh cm^-2 as well as excellent cycle stability with 66.7% capacity retention and ≈100% coulombic efficiency after 200 cycles at a current density of 1 mA cm^–2, indicative of its quite promising application toward high-performance lithium-ion batteries.     

微弯型科氏质量流量计测量气-液两相流研究

与普通U形和Δ形科氏质量流量计相比,微弯型科氏质量流量计固有频率更高、相位差更小,测量气-液两相流时误差更大。为此,设计气-液两相流实验方案,采用课题组研制的科氏质量流量变送器进行气-液两相流实验,采用BP人工神经网络对测量误差进行建模,得到误差模型,实现对气-液两相流测量误差的在线实时修正。实验结果表明,当密度降在0%~30%范围内变化时,通过在线修正,气-液两相流测量误差从原来的最大为-50%减小到-5%~3%以内,取得了很好的效果。     

板坯组织类型及热处理工艺对Ti6321合金板材组织与性能的影响

结合力学性能测试和OM、SEM分析,研究了不同板坯组织类型和热处理工艺对Ti6321合金组织与性能的影响。结果表明：合金板坯的组织类型对轧制板材的组织与性能状态具有显著影响,经相同工艺轧制后,等轴组织板坯形成双态组织板材,魏氏组织板坯形成等轴组织板材。(α+β)/β相变点以下热处理,等轴组织板坯制备板材的纵、横向的屈服强度和抗拉强度低于魏氏组织板坯制备板材对应方向的强度,延伸率和冲击功则相反;随加热温度的升高,不同板坯组织制备的板材其屈服强度、抗拉强度略有降低,冲击功则急剧升高。高于(α+β)/β相变点热处理,两合金的拉伸性能和冲击功均明显下降。合金板材在α+β两相区热处理过程,初生α相对温度的敏感性高于对保温时间的敏感性。随着温度的升高,初生α相含量急剧下降,而次生片状α相含量明显增加。Ti6321合金板材适宜的热处理工艺为：(940℃～980℃)×(2～3)h。