港里矿软破围岩采矿的分析与研究

港里矿围岩软弱破碎，随开采深度延伸，地压显现越来越剧烈，严重影响港里矿正常回采。为研究港里矿软破围岩采矿，分析了影响采矿正常进行的因素和机理，调整采矿的顺序，使港里矿软破围岩采矿的困难得到根本扭转，保证了采矿生产的正常进行，选择围岩稳固及充分卸压部位布置斜坡道和联巷、优先回采围岩破碎的高应力区是地压管理的关键问题。     

运行压力对超声雾化溶液除湿系统性能的影响

基于溶液除湿热质传递过程中所遵循的质量平衡、能量平衡模型，以超声雾化溶液除湿系统（UADS）为例，探讨了在不同空气处理温度、湿度下，系统运行压力对除湿性能的影响。结果表明：随着运行压力的升高，UADS系统的除湿性能显著改善。特别是在所处理空气入口温度较高时，提升系统运行压力对除湿效率的提高作用更加显著。同时，当所处理空气的含湿量较大时，提高运行压力对系统除湿速率的增幅明显，而对除湿效率的改善作用减弱。此外，当除湿系统在较高压力下运行时，其除湿效率受所处理空气入口温湿度变化而产生的波动减小，系统性能稳定性显著改善。所得结果可对溶液除湿系统的高效、稳定运行提供积极参考。     

极薄、超宽规格装甲板压力淬火工艺数值模拟优化

利用数值模拟的方法对极薄、超宽规格装甲板淬火过程的畸变进行了模拟研究,并对脉冲式压力淬火的控制参数进行了优化。通过对比不同冷却条件装甲板的变形量,确定了脉冲式压力淬火的脉冲压力和周期。结果表明,脉冲约束的模拟条件下,装甲板在厚度Z方向上的最终变形量为1.7 mm,不仅小于2 mm的标准要求,而且可以实现装甲板的小淬火畸变前提下满足其表面无压痕、划痕等其他损伤的实际生产需求。     

高压辊磨+搅拌磨在某复杂难选铁矿石选别工艺中的优越性研究

为了验证在某复杂难选铁矿石的选矿工艺中，应用高压辊磨机和立式搅拌磨的优越性，进行了一系列对比试验。结果表明，与颚式破碎机相比，高压辊磨机产品的粉矿率更高，产品的可磨性更好；与球磨机相比，立式搅拌磨机细磨效率更高、效果更好，相同磨矿细度下，立式搅拌磨机磨矿产品的解离度更高，磁选铁精矿品位也更高；高压辊磨+立式搅拌磨在处理复杂难选铁矿石方面具有显著的优势。     

Low temperature heat capacity measurements of β-Si3N4 and γ-Si3N4: Determination of the equilibrium phase boundary between β-Si3N4 and γ-Si3N4

Isobaric heat capacities of β-Si₃N₄ and γ-Si₃N₄ were measured at temperatures between 1.8 and 309.9 K with a thermal relaxation method. The measured heat capacities of γ-Si₃N₄ are smaller than those of β-Si₃N₄ in this temperature range. Using these data, we determined the standard entropies of β-Si₃N₄ and γ-Si₃N₄ to be 62.30 J·mol⁻¹ K⁻¹ and 51.79 J·mol⁻¹ K⁻¹, respectively. The equilibrium phase boundary between β-Si₃N₄ and γ-Si₃N₄ was calculated using these values and thermodynamic parameters reported in previous studies. The obtained equilibrium phase transition pressure at 2000 K is 11.4 GPa. It is lower than the experimental pressures at which γ-Si₃N₄ was synthesized in previous studies. The calculated Clapeyron slope at this temperature is 0.6 MPa K⁻¹, which is consistent with those of theoretical studies.     

基于直剪试验的页岩水化作用的强度弱化规律

随着页岩气资源的不断开发,水平井段的硬脆性页岩井壁失稳问题也越来越突出。为此,通过对水基、油基钻井液浸泡后的页岩岩样直剪试验,并结合单组弱面强度理论,分析了内聚力和内摩擦角对页岩强度的影响规律以及不同钻井液浸泡后的页岩强度弱化规律。对试验数据的分析结果表明:①水基、油基钻井液浸泡后内聚力和内摩擦角均下降,其垂直层理面方向的内摩擦角和内聚力均高于平行层理面方向;②页岩强度随钻井液浸泡时长增加而降低,受水化作用影响层理面导致强度降低,微裂缝表现为更易扩展,页岩容易产生破坏;③内聚力控制页岩强度大小,内摩擦角控制页岩沿弱面破坏的范围;④水基钻井液对页岩影响较为明显,页岩受其浸泡后强度下降较快,并随浸泡时间增加页岩强度持续下降,同时沿弱面破坏的角度限明显增大,油基钻井液能较好地保持岩样强度水平。最后,以四川盆地志留系龙马溪组M气藏为例,通过水平井段坍塌压力的计算,认识到水基钻井液基本不能满足钻井要求,而应采用油基钻井液且优先考虑沿最小水平地应力方向钻进。     

双弹性板矩形空腔内噪声的有源力控制

研究了在弹性板上施加不同参数的有源力对腔内噪声进行控制的问题。构建双弹性板构成的封闭矩形声腔模型，对封闭声腔的结构 声耦合特性进行分析，推导了在封闭声腔有源力控制作用下声压计算公式，给出采用有源力控制的最优控制模型。分析了弹性板在不同参数的次级力源激励下腔内局部声场的声压级响应，并建立了仿真模型对局部声场的减噪效果进行分析。结果表明，合理选择次级力源的参数对控制效果的影响较为明显，且次级力源的个数并非越多越好。     

Characterization of an acrylic polymer under hygrothermal aging as an optically clear adhesive for touch screen panels

Optically clear adhesives (OCAs) are key components of touch screen panels (TSPs). It is important that OCAs do not affect the transparent electrodes in TSPs because OCAs are contacted to the transparent electrodes. Therefore, N-vinyl caprolactam (NVC) was incorporated in the composition of an acrylic pressure sensitive adhesive (PSA) with excluding an acidic component to maintain the cohesion for OCA preparation. With increasing amounts of NVC, the tack and peel strength of UV-cured PSA increased, but high amounts of NVC led to decreased peel strength. The UV-cured PSA films were placed in a high temperature and humidity chamber for 8 weeks to investigate the durability and corrosion property under hygrothermal conditions. In this study, the corrosion test method using copper foil was suggested as a simple and economical method and was used to evaluate the effect of NVC on the corrosion property of PSA. This method helped identify suitable OCAs that do not have corrosive property. PSA films containing more than 20 wt% of NVC promoted the corrosion of copper foil under hygrothermal aging conditions. The caprolactam ring was opened by moisture, and the PSA structure morphed into a polar structure during the aging process. This change caused a glass transition shift, an increase in the storage modulus at the rubbery plateau, and an increase in peel strength. The surface free energy of the PSA films also increased due to the increase in the polar property. However, high amounts of NVC caused a decrease in the peel strength after 8 weeks of aging because of increased molecular interactions.