海上风电集群电能组合输送方式研究

江苏如东大规模海上风电场建设工程包括9个潮间带,各风电场分散布局,采用单一的输电方式不仅输电效率低,工程建设资金较高,而且海底电缆对海域资源的占用和施工期对海域环境的影响较大。文中依托江苏如东大规模海上风电场建设工程,研究分散布局的大规模海上风电场集群电能最优输送方式,深入研究了不同输电方式的特性及适用范围,提出了适合分散布局、离岸距离差距较大的大规模海上风电场的电能输送优化方案,并详细仿真研究了电能输送优化方案中的无功配置及过电压水平,提出了在海缆末端并联补偿度为60%~70%的电抗器,能够有效限制工频过电压;限制操作过电压的策略需要根据海上风电场的具体布置具体设计。     

一种小型化高线性 GaN 功放器设计

采用ADS软件对一种高线性GaN功率放大器进行匹配电路设计,并制作了一款超小尺寸的高线性放大电路。该电路采用0.254 mm厚的Al2 O3陶瓷作为基板,放大晶体管选用无封装芯片,在5 mm ×6 mm的小尺寸范围内完成电路制作。制作的小尺寸高线性放大电路实现了在输入双音信号频率为4 G Hz和4.002 G Hz、输出总功率为2 W时,三阶互调抑制35 dBc ,功率附加效率35％。     

重视局数据修改的管理工作

举例分析了局数据修改必须以通信主管部门批准的书面通知为依据，凭运维部主管科室签字的“局数据修改通知单”拟定的预案执行，任何随意行为都可能造成重大通信障碍，然后详细介绍了“局数据修改通知单”格式的主体部分和细则。     

Al-7Si合金热分析曲线识别与熔体细化处理研究

介绍了一种新的热分析冷却曲线模式识别方法，用以评估Al—7Si合金的细化效果．采用冷却曲线凝固段(由大量初晶形核温度到大量共晶形核温度)作为标识，利用数据库建立冷却曲线与晶粒尺寸(细化处理效果)间的关系，通过冷却曲线模式识别结合数据库的方式测评Al—7Si合金的细化处理效果．结果表明：当表征冷却曲线间相似性的综合偏差值Ω趋近于0时，晶粒尺寸间的差向0收敛．在一定的凝固条件下，待测熔体的细化处理效果可通过数据库中与待测熔体的冷却曲线最相近曲线所对应的细化处理效果来定量评估．     

松辽盆地南部大情字井地区层序地层及隐蔽油气藏预测

应用大量钻井、测井和地震等资料,建立层序地层格架,分析了大情字井地区层序地层发育特征,总结出层序格架内油气藏的分布规律。统计结果显示,有48.2％的油气储存于低位体系域中,有26.8％的油气储于水进体系域中,而有25.0％的油气储于高位体系域中。低位体系域是隐蔽油气藏勘探的重要部位。在此基础上,重点对大情字井三维地震探区的高台子油层开展波阻抗反演和吸收系数处理,分析和总结了含油砂体的识别特征,预测了储集砂体和隐蔽圈闭油气分布的有利部位。     

Ⅱ.防霉药品的实验室试验

我们用霉克星DMF及杀菌防腐剂BTX对29株霉菌及9株酵母菌做了抑制试验。从制霉效果看,DMF明显优于BTX,前者除共同霉需400mg/kg外,其余只需100mg/kg即可完全抑制;而BTX在1000mg/kg时尚有1株青霉未被抑制,但对酵母菌方面,BTX略优于DMF,前者在100mg/kg时,能抑制试验的9株酵母菌,而DMF需200mg/kg才达目的。DMF为白色粉末,无三致作用及蓄积毒性且适用范围广,而BTX药剂为有臭味的褐色透明液体,对眼及皮肤稍有刺激,因此认为DMF药剂,可在现场试验,以观察实效。     

A new double reduction method for slope stability analysis简

The core of strength reduction method （SRM） involves finding a critical strength curve that happens to make the slope globally fail and a definition of factor of safety （FOS）. A new double reduction method, including a detailed calculation procedure and a definition of FOS for slope stability was developed based on the understanding of SRM. When constructing the new definition of FOS, efforts were made to make sure that it has concise physical meanings and fully reflects the shear strength of the slope. Two examples, slopes A and B with the slope angles of 63~ and 34~ respectively, were given to verify the method presented. It is found that, for these two slopes, the FOSs from original strength reduction method are respectively 1.5% and 38% higher than those from double reduction method. It is also found that the double reduction method predicts a deeper potential slide line and a larger slide mass. These results show that on one hand, the double reduction method is comparative to the traditional methods and is reasonable, and on the other hand, the original strength reduction method may overestimate the safety of a slope. The method presented is advised to be considered as an additional option in the practical slope stability evaluations although more useful experience is required.     

A strength reduction method based on double reduction parameters and its application

In the traditional strength reduction method,the cohesion and the friction angle adopt the same reduction parameter,resulting in equivalent proportional reduction.This method does not consider the different effects of the cohesion and friction angle on the stability of the same slope and is defective to some extent.Regarding this defect,a strength reduction method based on double reduction parameters,which adopts different reduction parameters,is proposed.The core of the double-parameter reduction method is the matching reduction principle of the slope with different angles.This principle is represented by the ratio of the reduction parameter of the cohesion to that of the friction angle,described as η.With the increase in the slopeangle,ηincreases; in particular,when the slope angle is 45°,tηis 1.0.Through the matching reduction principle,different safety margin factors can be calculated for the cohesion and friction angle.In combination with these two safety margin factors,a formula for calculating the overall safety factor of the slope is proposed,reflecting the different contributions of the cohesion and friction angle to the slope stability.Finally,it is shown that the strength reduction method based on double reduction parameters acquires a larger safety factor than the classic limit equilibrium method,but the calculation results are very close to those obtained by the limit equilibrium method.     

提高CO2封存强度的多层协同抽注技术

我国已提出2030年碳达峰、2060年碳中和的碳减排目标,提高CCUS技术发展水平与商业化规模,是实现我国碳减排目标的关键所在。“十四五”规划已明确提出要开展碳捕集利用与封存（CCUS）重大项目示范。然而,由于我国大多数CO2储层的低渗透、非均质等特征,导致单一储层的CO2封存能力有限,无法满足CCUS重大项目示范所需的CO2地质封存量。本研究首次提出以CO2封存强度（单位土地面积的CO2封存量）作为评价CCUS项目储层封存能力的关键指标,并计算了我国主要CO2咸水层封存和CO2强化驱油场地的CO2封存强度。计算结果表明,现有CO2咸水层封存和CO2强化驱油项目的封存强度大多在105 t/km2以下,无法满足我国双碳目标的需要。为显著提高CO2封存强度,本研究提出了CO2多层协同抽注技术的概念,通过注入井在多个储层射孔注入CO2,并利用抽水井从多个储层中抽出咸水,实现储层可用孔隙和储层压力的最优化调控,最终实现CO2封存强度的大幅度提高。为研究CO2多层协同抽注技术的效果,本文利用T2Well模拟软件,构建了三种CO2多层统注的数值模型,模拟了CO2定压注入过程,分析了注入60天后储层压力分布、储层内CO2饱和度分布以及CO2累计注入量。模拟结果表明,在多层抽注协同条件下,储层压力聚集现象有明显缓解,从而降低了封存区域因压力聚集导致的力学不稳定性。通过分析CO2饱和度可知,CO2注入后在抽注井间压力差的驱使下,羽流将向抽出井偏移;此外,受岩石性质的影响,羽流形状和范围略有差异。根据三种条件下的模拟结果,计算CO2封存强度可知,非均质砂岩条件下多层协同抽注的封存强度最高达到111.5×104 t/km2,远大于现在已实施项目的封存强度。因此,多层协同抽注技术将大大提高CO2封存强度,有利于节约我国国土资源,并可促进CO2封存技术的推广。