FEM地层元素测井仪可靠性及应用效果评价

柴达木盆地复杂碳酸盐岩、致密混积岩等储层并存,常规测井方法难以进行有效的储层评价。FEM地层元素测井可测量地层中常见元素,并提供较为准确的地层矿物成分和储层物性等参数。介绍了FEM地层元素测井仪特征及其数据处理方法,对其在不同条件下的稳定性和一致性进行了大量的测井及实验验证,认为该仪器可靠性较高。在实际应用中,有效地解决了英西地区复杂碳酸盐岩有效储层划分、有效孔隙度计算及储层分类的难点和扎哈泉地区致密油储层岩性、物性、源岩特性及可压裂性的问题。实践表明,FEM地层元素测井基本满足各类复杂储层评价的需求,但仍有一定的局限与不足。     

低温球磨制备纳米晶Al-Zn-Mg-Cu合金

利用低温液氮球磨技术制备了Al-Zn-Mg-Cu合金纳米晶粉末,并采用X射线衍射(XRD)对材料在球磨过程中的晶粒尺寸和微观应变进行了研究,利用扫描电镜(SEM)、透射电镜(TEM)和差热分析(DSC)等测试方法研究了材料的固态相变以及热稳定性.研究表明,粉末晶粒尺寸随着球磨的进行逐渐减小,球磨10h后晶粒尺寸达到45nm;微观应变随着球磨的进行逐渐增大.粉末球磨过程中,MgZn₂相逐渐减少,合金元素过饱和固溶于α-Al晶格之中.球磨10h后仅有少量的MgZn₂相存在.制备的Al-Zn-Mg-Cu纳米晶粉末在低于709K下加热,粉末晶粒长大速度较慢,表明Al-Zn-Mg-Cu纳米晶粉末具有较高的热稳定性.     

防砂埋套管水力喷射泵研制

水力喷射泵具有独特的井液举升特点,适用于斜井、高温、稠油、出砂、结蜡和腐蚀等复杂情况的油井[1]。但用于携排砂生产,易发生埋封隔器造成油井大修。针对水力喷射泵应用于携砂采油存在的技术缺欠,研制了防砂埋套管水力喷射泵。分析了其它水力喷射泵的技术缺欠,提出了从套管注动力液、液力起下泵芯的技术思路,进行了泵研制和室内实验,介绍了套管水力喷射泵的结构、技术原理、技术特点及现场排砂采油应用情况。通过14井次试验表明,防砂埋套管水力喷射泵具有以下技术特点:工作特性符合普通射流泵的特性曲线、液力投捞泵芯,调整泵性能参数、可正洗井,清除油管结蜡、可随时录取油井生产流压、可有效避免地层砂埋封隔器及采油管柱等技术优点,适应含砂小于8%油井,最大排量150m3/d,泵使用寿命大于90d。     

企业国际公关初探

当今世界市场日趋统一．国际经济关系更加错综复杂．作为公共关系学重要组成部分的国际公关在国际营销中越来越显现其重要作用．随着商品经济的发展和改革开放的深入．公共关系在我国将得到广泛传播．对国际公关的理论探讨及实践，在国际经贸活动中具有重要意义．     

From Glutinous-Rice-Inspired Adhesive Organohydrogels to Flexible Electronic Devices Toward Wearable Sensing,Power Supply,and Energy Storage

Flexible electronic devices (FEDs) based on hydrogels are attracting increasing interest, but the fabrication of hydrogels for FEDs with adhesiveness and high robustness in harsh-temperature conditions and long-term use remains a challenge. Herein, glutinous-rice-inspired adhesive organohydrogels are developed by introducing amylopectin into a copolymer network through a “one-pot” crosslinking procedure in a glycerol–water mixed solvent containing potassium chloride as the conductive ingredient. The organohydrogels exhibit excellent transparency (>90%), conductivity, stretchability, tensile strength, adhesiveness, anti-freezing property, and moisture retention ability. The wearable strain sensor assembled from the organohydrogels achieves a wide working range, high sensitivity (gauge factor: 8.82), low response time, and excellent reversibility, and properly responds in harsh-temperature conditions and long-time storage (90 days). The strain sensor is further integrated with a Bluetooth transmitter and receiver for fabricating wireless wearable sensors. Notably, a sandwich-structured capacitive pressure sensor with organohydrogels containing reliefs as electrodes records a new gauge factor of 9.43 kPa^?1 and achieves a wide response range, low detection limit, and outstanding reversibility. Furthermore, detachable and durable batteries and all-in-one supercapacitors are also fabricated utilizing the organohydrogels as electrolytes. Overall, this work offers a strategy to fabricate adhesive organohydrogels for robust FEDs toward wearable sensing, power supply, and energy storage.     

一种高线性无源双平衡混频器

设计了一种适用于1.0～2.0 GHz的高线性下变频混频器。电路设计采用了无源双平衡结构,片内集成宽带巴伦、限幅本振放大器、混频核和偏置电路。为了提高混频器的线性度,在对无源双平衡的结构进行分析的基础上,折中选择混频核的晶体管尺寸,并优化了本振放大器输出信号的幅值及上升时间。基于0.35μm BiCMOS工艺进行了设计仿真,芯片面积为0.9 mm×1.8 mm。流片测试结果表明:射频频率1.0～2.0 GHz,对应本振频率1.0～2.0 GHz,最佳本振输入功率为0 dBm,转换增益大于-7.0 dB,射频输入三阶交调大于25 dBm,混频器工作电压为3.3 V,功耗为112 mW。该高线性无源双平衡混频器可满足工程应用。     

A CO2-switchable amidine monomer: synthesis and characterization

Smart system employed CO₂ gas as new trigger has been attracting enormous attention in recent years, but few monomers that are capable of switching their hydrophobicity/hydrophility upon CO₂ stimulation have been reported. A novel CO₂ responsive monomer, 4-vinylbenzyl amidine, is designed and synthesized in this work with N,N-dimethylacetamide dimethyl acetal and 4-vinylbenzyl amine that is prepared through the Gabriel reaction. In bi-phase solvent of n-hexane and water, the monomer dissolves in n-hexane first and then transforms into water upon the CO₂ treatment, indicating a hydrophobic to hydrophilic transition. This transformation is demonstrated as reversible by monitoring the conductivity variation of its wet dimethyl formamide solution during alternate bubbling/removing CO₂. The protonation of 4-vinylbenzyl amidine upon CO₂ treatment is demonstrated by ¹H NMR which also accounts for the dissolubility change. The reversible addition-fragmentation chain-transfer polymerization of this monomer is also performed, finding the reaction only occurs in glacial acetic acid. The reason can be ascribed to the different radical structure produced in different solvent.     

浅议机械化插秧技术的推广

推广应用机械化插秧技术能提高水稻机械化生产水平,促进粮食增产,提高农民收入,有利于农村劳动力的转移和发展标准化农业,共同探讨如何推广应用机械化插秧技术.     

Preparation of trichlorosilane from hydrogenation of silicon tetrachloride in thermal plasma

A new method of producing trichlorosilane by hydrogenation of silicon tetrachloride with assistance of DC charged thermo-plasma was proposed. We have studied the dependence of degree of disassociation and ionization of hydrogen on temperature, as well as the function of heat capacity, via which the optimal volume and H₂: SiCl₄ molar ratio were confirmed. A DC power of 50 kW was equipped and the highest yield of trichlorosilane was above 70%, with an average yield about 60% and minimum unit energy expenditure about 3.2 kWh/kg for SiHCl₃. This process is possible to be industrialized.     

Parametric study on damage control design of SMA dampers in frame-typed steel piers

This paper focuses on damage control design of SMA dampers in steel frame piers. A parametric study based on time history analyses is carried out on frame-typed bridge piers with axial-type SMA damping device. The parameters examined are design parameters of strength ratio α _F and stiffness ratio α _K . Seismic performance indexes on displacement and strain are investigated under three JRA recommended Level 2 Ground Type II strong earthquake motions. Design recommendations are suggested following the results of the parametric study.