A compact uniplanar antenna for nine‐band LTE/WWAN operation in tablet computers

A compact uniplanar dual wideband antenna for tablet computers is presented. The proposed antenna provides full coverage of LTE700/2300/2500, GSM850/900/1800/1900, UMTS2100, Bluetooth, and 2.4‐GHz WLAN bands with a very small foot print 30 × 10 mm². The antenna has uniplanar structure and is easy to fabricate on single side of 0.8‐mm thick FR4 substrate. This is achieved through three optimized strips: a feeding strip, an inductively coupled inverted L‐shaped strip, and a shorted strip embedded with SMT components. The proposed design supports more than eight operating bands in 3:1 VSWR standard, exhibiting positive gains over all nine bands of operation and 80%–90% radiation efficiency in the higher LTE and WWAN bands. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:496–502, 2016.     

盐酸雷尼替丁胃内滞留漂浮型缓释片研制以及犬体内药物动力学

制备了24 h盐酸雷尼替丁胃内滞留漂浮型缓释片(RH RFSRT)。以水凝胶骨架作为胃内滞留漂浮型缓释片材料处方,研究了制剂体外释放度,漂浮性能以及对制剂在犬体内的药物动力学进行了初步研究。实验结果表明:RH RFSRT的累积释放百分率符合H iguch i方程;体内药物动力学参数为AUC=25 571.691 ng.h/mL,MRT=5.2 h,mρax=5 867.98 ng/mL,相对生物利用度为178.16%。该制剂制备工艺简单,质量稳定,可以延长体内滞留时间并能提高生物利用度。     

高速压片机电气控制系统设计

对高速压片机的电气控制系统进行设计改造,采用PLC、变频器和触摸屏通信控制,使高速压片机生产过程具有自动化程度高、操作简单、生产效率高等特点。     

卡莫氟分散片的制备及其处方优化

以崩解时限、溶出度、硬度、脆碎度为指标,采用正交设计实验,对卡莫氟分散片处方及制剂工艺进行筛选,按优选处方制备的卡莫氟分散片,可在3 min内完全崩解.结果表明:优选处方及制剂工艺的卡莫氟分散片溶出度明显优于普通片剂.     

信息化控制系统平板电脑设计与应用

通过对平板电脑多角度分类,对平板电脑完成任务分析,选择一款满足使用在具有高粉尘、烟雾、高温、低温、潮湿、高振动、高腐蚀等非常恶劣工程条件下的平板电脑。叙述了具体的设计考虑、给出了对所选电脑的环境试验考核指标。通过环境试验考核、实际运行,统计了样本数量足够多,可靠工作时间足够长的运行数据。大量样本的使用统计数据表明,正确设计选用了一款合适使用于恶劣工程环境的平板电脑。供工业控制设计同行借鉴。     

两种杀虫剂泡腾剂防治小菜蛾药效评价

应用5%甲维盐高氯和5%阿维高氯两种泡腾剂以及各对应单剂的不同制剂对小菜蛾幼虫进行了田间药效评价,结果表明:两种泡腾剂对小菜蛾幼虫均有良好效果,尤其是5%甲维盐高氯泡腾剂施药后7d的平均防效达90%以上,优于其他剂型的处理,对试验作物无药害。     

Learning English reading in a mobile-assisted extensive reading program

Previous studies on Extensive Reading Programs (ERPs) have reached positive conclusions, namely, that an ERP for language learners is effective in improving their linguistic abilities related to reading and promoting their motivation and attitudes toward reading. Current mobile devices, even though suitable for reading, have not yet been applied to develop language learners' linguistic proficiency and affective abilities in any ERP. The aim of the present study was to address this gap in literature by investigating the effects of using mobile tablet PCs in an online ERP on adolescent English learners' online activities, reading ability and users' perceptions. Two intact classes taught by a same English teacher in a senior high school in Taiwan were recruited to participate in a ten-week online ERP. One class was assigned to the mobile group reading their assignments on their tablet PCs and the other, the PC group, reading theirs on desktop PCs. During the online ERP, each class dedicated one class period every week for in-class reading and the participants in both classes were encouraged to read as many as possible after the class period. The results favored the mobile group who not only outperformed the PC group in online activities and reading achievement but also showed greater appreciation of the online ERP than their PC counterparts. The study also proposed two directions for future studies on mobile-assisted reading. They included learners' studying textbooks and their reading strategies on mobile devices.     

Characterization of new functionalized calcium carbonate-polycaprolactone composite material for application in geometry-constrained drug release formulation development

A new mineral–polymer composite (FCC-PCL) performance was assessed to produce complex geometries to aid in development of controlled release tablet formulations. The mechanical characteristics of a developed material such as compactibility, compressibility and elastoplastic deformation were measured. The results and comparative analysis versus other common excipients suggest efficient formation of a complex, stable and impermeable geometries for constrained drug release modifications under compression. The performance of the proposed composite material has been tested by compacting it into a geometrically altered tablet (Tablet-In-Cup, TIC) and the drug release was compared to commercially available product. The TIC device exhibited a uniform surface, showed high physical stability, and showed absence of friability. FCC-PCL composite had good binding properties and good compactibility. It was possible to reveal an enhanced plasticity characteristic of a new material which was not present in the individual components. The presented FCC-PCL composite mixture has the potential to become a successful tool to formulate controlled-release dosage solid forms.     

Immediate release of ibuprofen from Fujicalin®-based fast-dissolving self-emulsifying tablets

Background: Drug release from a solid form of self-emulsifying drug delivery system (SEDDS) has greatly been limited due to strong adsorption and physical interaction with carriers. To facilitate drug release process in the stomach, an acid-soluble powderizing carrier, Fujicalin^® was evaluated together with different disintegrants and hydrophilic lubricants. Method: Immediate-release self-emulsifying tablets (IR-SETs) of ibuprofen (IBU) was prepared with solidified SEDDS of IBU, various disintegrants, and lubricants, and drug release was evaluated to develop IR-SET that can release IBU with a similar IBU release rate to that obtained with liquid SEDDS. Results: The liquid SEDDS consisted of Capryol 90, Cremophor EL, Labrasol, and IBU at a ratio of 3:4:3:3, and was solidified with various adsorbents. The powderized SEDDS was tabletted by a direct compression. Fujicalin^®-based SEDDS tablets demonstrated remarkably higher dissolution rate of IBU compared with Neusilin^® and Neosyl^®-based SEDDS tablets. The IR-SET formula of IBU prepared with Fujicalin^® as an adsorbent, Polyplasdone^® as a disintegrant, and sodium bicarbonate as a co-disintegrant showed over 90% of initially loaded dose of IBU released within 5?min in a stimulated gastric juice (pH 1.2), exhibiting almost equivalent rate of IBU release to that shown by liquid SEDDS. The particle size analysis revealed no significant differences in droplet sizes of the microemulsions formed from liquid (116?nm) and IR-SET (110?nm). Conclusion: The novel IR-SET can be promising as a fast-releasing SEDDS tablet of IBU for fast onset of action.     

Effect of text‐background lightness combination on visual comfort for reading on a tablet display under different surrounds

Many tablets are designed to change display brightness or color with surround for enhancing visual comfort. Although both color and brightness of a surround may vary a lot, few studies investigated how text‐background lightness combination of a tablet display and surround jointly affect visual comfort, and how display white point affects visual comfort. In this study, 20 observers evaluated visual comfort of 20 text‐background lightness combinations of a 9.7‐inch tablet display through paired comparisons under five surrounds—a dark surround and four ambient lighting conditions comprising two levels of correlated color temperature (CCT)—3500 and 6500 K—and illuminance—300 and 3000 lx. The combination of a black text and a light‐gray background (i.e., L^*_background = 75.33; L^*_text = 1.6) was evaluated the most comfortable when there was ambient light regardless of CCT and illuminance. It was also evaluated the third most comfortable under the dark surround. The observers also evaluated the visual comfort of a dark text on five different white backgrounds under 3500 and 6500 K at 1000 lx. The color of the background that was judged as the most comfortable neither had the whitest appearance nor matched the color of the ambient light. The simultaneous adjustment of the display white point and the text‐background lightness combination merits further investigations.