We fabricated dye-sensitized solar cells with non-cross-linked fluorinated gel electrolyte. The application of fluorinated gel to electrolyte is a challenging issue at present. The gelation of the electrolyte is of im...We fabricated dye-sensitized solar cells with non-cross-linked fluorinated gel electrolyte. The application of fluorinated gel to electrolyte is a challenging issue at present. The gelation of the electrolyte is of importance in order to solve the problem in the durability of the cell. We investigated, in this article, the effect of Pt deposition on the anode of the cell. The Pt was deposited by means of a DC sputtering technique. The studies showed that the deposition time strongly affected both open voltage and short-circuit current of the cell. The adaptive thickness of the Pt layer was determined to be 10 nm for the non-cross-linked fluorinated gel electrolyte cells.展开更多
AIM： To evaluate the visual outcomes of simultaneous non-topography guided photorefractive keratectomy（PRK） and corneal collagen cross-linking（CXL） in eyes with keratoconus 5 y after the procedure.METHODS： Prosp...AIM： To evaluate the visual outcomes of simultaneous non-topography guided photorefractive keratectomy（PRK） and corneal collagen cross-linking（CXL） in eyes with keratoconus 5 y after the procedure.METHODS： Prospective, interventional, non-randomized, and non-controlled case series design was used. Sixty eyes of 30 patients（16 males and 14 females; age： 21-41 y） with mild, non-progressive（stages 1-2） keratoconus were enrolled. Refraction, uncorrected distance visual acuity（UDVA） and corrected distance visual acuity（CDVA）, flat and steep keratometry readings, and adverse events were evaluated preoperatively and postoperatively. Data were collected preoperatively and postoperatively at 3 mo, 1, 2, 3, 4, and 5 y follow-up visits after combined non-topography-guided PRK with CXL was performed. All patients had at least 5 y of follow-up.RESULTS： All study parameters showed a statistically significant improvement at 5 y over baseline values. The mean follow-up time was 68.20±4.71 mo（range： 60-106 mo）. Patients showed a significant improvement in UDVA from 1.24±0.79 log MAR prior to combined non-TG-PRK＋CXL to 0.06±0.15 log MAR postoperatively at the time of their last follow-up visit. CDVA significantly increased from 0.06±0.19 log MAR preoperatively to 0.03±0.12 log MAR postoperatively. A significant decrease in the mean spherical equivalent（SE） refraction was observed from-2.28±1.8 to-0.79±0.93 diopters（D）（P〈0.05）, and the manifest sphere decreased from-1.62±1.23 to-0.27±0.21 D（P=0.001）. The manifest cylinder significantly decreased from-1.73±0.86 to-0.29±0.34 D postoperatively（P=0.001）. The mean steep keratometry was 45.13±1.32 vs 47.28±2.12 D preoperatively（P〈0.05）, and the preoperative mean steepest keratometry（Kmax） 48.6±3.1 was reduced significantly to 46.8±2.9 postoperatively（P〈0.05）. CONCLUSION： Combined non-TG-PRK with 15 min CXL is an effective and safe option for correcting mild refractive error and improving visual acuity in patients with mild stable keratoconus.展开更多
近年来,随着普适计算概念的深入人心,智能感知技术已成为研究者们关注的焦点,且基于WiFi的非接触式感知因其优秀的普适性、低廉的部署成本以及良好的用户体验越来越受到学术界和工业界的青睐.典型的WiFi非接触式感知工作有手势识别、呼...近年来,随着普适计算概念的深入人心,智能感知技术已成为研究者们关注的焦点,且基于WiFi的非接触式感知因其优秀的普适性、低廉的部署成本以及良好的用户体验越来越受到学术界和工业界的青睐.典型的WiFi非接触式感知工作有手势识别、呼吸检测、入侵检测、行为识别等,这些工作若实际部署,需首先避免其他无关区域中无关行为的干扰,因此需要判断目标是否进入到特定的感知区域中.这意味着系统应具备精准判断目标在界线哪一侧的能力,然而现有工作未能找到一个可以对某个自由设定的边界进行精确监控的方法,这阻碍了WiFi感知应用的实际落地.基于这一关键问题,从电磁波衍射的物理本质出发,结合菲涅尔衍射模型(Fresnel diffraction model),找到一种目标穿越link(收发设备天线的连线)时的信号特征(Rayleigh distribution in Fresnel diffraction model,RFD),并揭示该信号特征与人体活动之间的数学关系;之后以link作为边界,结合天线间距带来的波形时延以及AGC(automatic gain control)在link被遮挡时的特征,通过越线检测实现对边界的监控.在此基础上,还实现了两个实际应用,即入侵检测系统和居家状态监测系统,前者的精确率超过89%、召回率超过91%,后者的准确率超过89%.在验证所提边界监控算法的可用性和鲁棒性的同时,也展示了所提方法与其他WiFi感知技术相结合的巨大潜力,为WiFi感知技术的实际部署提供了思考方向.展开更多
针对常规压裂液体系有机金属离子交联剂毒性较大且在碱性条件下不可避免的会对地层产生二次污染以及非金属离子交联剂形成的压裂液成胶速度慢且不抗剪切的问题,本文制备了由一种非金属离子交联体系形成的低毒性压裂液,通过对影响凝胶性...针对常规压裂液体系有机金属离子交联剂毒性较大且在碱性条件下不可避免的会对地层产生二次污染以及非金属离子交联剂形成的压裂液成胶速度慢且不抗剪切的问题,本文制备了由一种非金属离子交联体系形成的低毒性压裂液,通过对影响凝胶性能的主要因素进行分析得到了压裂液的最佳配方,并考察了压裂液的耐温抗剪切性能和破乳性能。实验结果表明:当稠化剂含量为0.075%、p H值调节剂0.015%、乙醇1%、促凝剂0.020%~0.025%、交联剂0.25%、氯化钾0~2%时,可制备出成胶时间短、耐温抗剪切性能和破胶性能优良的压裂液。该压裂液体系的成胶时间约为150 s左右,成胶后压裂液初始黏度为1529.0 m Pa·s,在100℃、170 s-1下剪切60、90、120 min后的黏度分别为259.9、197.4和166.8 m Pa·s;90℃下向压裂液中加入0.03%过硫酸钾破胶剂,3 h后完全破胶,破胶液清澈透明,黏度为1.07 m Pa·s。所研制的交联剂不含任何高价金属离子,减小了压裂液对地层的伤害。展开更多
文摘We fabricated dye-sensitized solar cells with non-cross-linked fluorinated gel electrolyte. The application of fluorinated gel to electrolyte is a challenging issue at present. The gelation of the electrolyte is of importance in order to solve the problem in the durability of the cell. We investigated, in this article, the effect of Pt deposition on the anode of the cell. The Pt was deposited by means of a DC sputtering technique. The studies showed that the deposition time strongly affected both open voltage and short-circuit current of the cell. The adaptive thickness of the Pt layer was determined to be 10 nm for the non-cross-linked fluorinated gel electrolyte cells.
文摘AIM： To evaluate the visual outcomes of simultaneous non-topography guided photorefractive keratectomy（PRK） and corneal collagen cross-linking（CXL） in eyes with keratoconus 5 y after the procedure.METHODS： Prospective, interventional, non-randomized, and non-controlled case series design was used. Sixty eyes of 30 patients（16 males and 14 females; age： 21-41 y） with mild, non-progressive（stages 1-2） keratoconus were enrolled. Refraction, uncorrected distance visual acuity（UDVA） and corrected distance visual acuity（CDVA）, flat and steep keratometry readings, and adverse events were evaluated preoperatively and postoperatively. Data were collected preoperatively and postoperatively at 3 mo, 1, 2, 3, 4, and 5 y follow-up visits after combined non-topography-guided PRK with CXL was performed. All patients had at least 5 y of follow-up.RESULTS： All study parameters showed a statistically significant improvement at 5 y over baseline values. The mean follow-up time was 68.20±4.71 mo（range： 60-106 mo）. Patients showed a significant improvement in UDVA from 1.24±0.79 log MAR prior to combined non-TG-PRK＋CXL to 0.06±0.15 log MAR postoperatively at the time of their last follow-up visit. CDVA significantly increased from 0.06±0.19 log MAR preoperatively to 0.03±0.12 log MAR postoperatively. A significant decrease in the mean spherical equivalent（SE） refraction was observed from-2.28±1.8 to-0.79±0.93 diopters（D）（P〈0.05）, and the manifest sphere decreased from-1.62±1.23 to-0.27±0.21 D（P=0.001）. The manifest cylinder significantly decreased from-1.73±0.86 to-0.29±0.34 D postoperatively（P=0.001）. The mean steep keratometry was 45.13±1.32 vs 47.28±2.12 D preoperatively（P〈0.05）, and the preoperative mean steepest keratometry（Kmax） 48.6±3.1 was reduced significantly to 46.8±2.9 postoperatively（P〈0.05）. CONCLUSION： Combined non-TG-PRK with 15 min CXL is an effective and safe option for correcting mild refractive error and improving visual acuity in patients with mild stable keratoconus.
文摘近年来,随着普适计算概念的深入人心,智能感知技术已成为研究者们关注的焦点,且基于WiFi的非接触式感知因其优秀的普适性、低廉的部署成本以及良好的用户体验越来越受到学术界和工业界的青睐.典型的WiFi非接触式感知工作有手势识别、呼吸检测、入侵检测、行为识别等,这些工作若实际部署,需首先避免其他无关区域中无关行为的干扰,因此需要判断目标是否进入到特定的感知区域中.这意味着系统应具备精准判断目标在界线哪一侧的能力,然而现有工作未能找到一个可以对某个自由设定的边界进行精确监控的方法,这阻碍了WiFi感知应用的实际落地.基于这一关键问题,从电磁波衍射的物理本质出发,结合菲涅尔衍射模型(Fresnel diffraction model),找到一种目标穿越link(收发设备天线的连线)时的信号特征(Rayleigh distribution in Fresnel diffraction model,RFD),并揭示该信号特征与人体活动之间的数学关系;之后以link作为边界,结合天线间距带来的波形时延以及AGC(automatic gain control)在link被遮挡时的特征,通过越线检测实现对边界的监控.在此基础上,还实现了两个实际应用,即入侵检测系统和居家状态监测系统,前者的精确率超过89%、召回率超过91%,后者的准确率超过89%.在验证所提边界监控算法的可用性和鲁棒性的同时,也展示了所提方法与其他WiFi感知技术相结合的巨大潜力,为WiFi感知技术的实际部署提供了思考方向.
文摘针对常规压裂液体系有机金属离子交联剂毒性较大且在碱性条件下不可避免的会对地层产生二次污染以及非金属离子交联剂形成的压裂液成胶速度慢且不抗剪切的问题,本文制备了由一种非金属离子交联体系形成的低毒性压裂液,通过对影响凝胶性能的主要因素进行分析得到了压裂液的最佳配方,并考察了压裂液的耐温抗剪切性能和破乳性能。实验结果表明:当稠化剂含量为0.075%、p H值调节剂0.015%、乙醇1%、促凝剂0.020%~0.025%、交联剂0.25%、氯化钾0~2%时,可制备出成胶时间短、耐温抗剪切性能和破胶性能优良的压裂液。该压裂液体系的成胶时间约为150 s左右,成胶后压裂液初始黏度为1529.0 m Pa·s,在100℃、170 s-1下剪切60、90、120 min后的黏度分别为259.9、197.4和166.8 m Pa·s;90℃下向压裂液中加入0.03%过硫酸钾破胶剂,3 h后完全破胶,破胶液清澈透明,黏度为1.07 m Pa·s。所研制的交联剂不含任何高价金属离子,减小了压裂液对地层的伤害。
