摘要：The study evaluated the adsorption of two antibiotics by four engineered adsorbents （hypercrosslinked resin MN-202, macroporous resin XAD-4, activated carbon F-400, and multi-walled carbon nanotubes （MWCNT）） from aqueous solutions. The dynamic results demonstrated the dominant influence of pore size in adsorption. The adsorption amounts of antibiotics on XAD-4 were attributed to the hydrophobic effect, whereas steric hindrance or micropore-filling played a main role in the adsorption of antibiotics by F-400 because of its high microporosity. Aside from F-400, similar patterns of pH-dependent adsorption were observed, implying the importance of antibiotic molecular forms to the adsorption process for adsorbents. Increasing the ionic concentration with CaCl 2 produced particular adsorption characteristics on MWCNT at pH 2.0 and F-400 at pH 8.0, which were attributed to the highly available contact surfaces and molecular sieving, respectively. Its hybrid characteristics incorporating a considerable portion of mesopores and micropores made hypercross linked MN-202 a superior antibiotic adsorbent with high adsorption capacity. Furthermore, the adsorption capacity of MWCNT on the basis of surface area was more advantageous than that of the other adsorbents because MWCNT has a much more compact molecular arrangement.

摘要：In response to competition for light from their neighbors,shade-intolerant plants flower precociously to ensure reproductive success and ***,the molecular mechanisms underlying this key developmental switch are not well ***,we show that a pair of Arabidopsis transcription factors essential for phytochrome A signaling,FAR-RED ELONGATED HYPOCOTYL3(FHY3)and FAR-RED IMPAIRED RESPONSE1(FAR1),regulate flowering time by integrating environmental light signals with the miR156-SPL module-mediated aging *** found that FHY3 and FAR1 directly interact with three flowering-promoting SQUAMOSA-PROMOTER BINDING PROTEIN-LIKE(SPL)transcription factors,SPL3,SPL4,and SPL5,and inhibit their binding to the promoters of several key flowering regulatory genes,including FRUITFUL(FUL),LEAFY(LFY),APETALA1(AP1),and MIR172C,thus downregulating their transcript levels and delaying *** simulated shade conditions,levels of SPL3/4/5 proteins increase,whereas levels of FHY3 and FAR1 proteins decline,thus releasing SPL3/4/5 from FHY3/FAR1 inhibition to allow activation of FUL,LFY,AP1,and MIR172C and,consequently,early *** together,these results unravel a novel mechanism whereby plants regulate flowering time by integrating environmental cues(such as light conditions)and an internal developmental program(the miR156-SPL module-mediated aging pathway).

摘要：随着城市环境问题不断凸显,以健康城市为导向的规划设计成为应对挑战的重要途径之一。本文拓展了“源-流”理论,包括社会和经济因素,并提出了一个适合城市设计的“源-流”模式。这种模式将健康城市中的“人类健康”和“城市健康”两方面突出问题作为“源”,使环境、社会、经济等解决问题的“流”形成一个网络,共同优化城市结构,以缓解城市环境问题和提高居民的生活质量。中国沈阳市的彩塔现代服务产业片区是一个典型的老城市中心,存在一些如风环境不友好、舒适度差和活力不足的问题。本文以此区域为例,从“风源”和“人源”两个方面出发,结合PHOENICS软件对该区域的风环境进行量化和模拟,构建了“风流+水流+绿流”和“人流+交通流+经济流”的优化策略。结果表明,这种优化策略可以实现滨水区生态效益的扩大,提高风环境的质量,激发街区的活力,提高居民的幸福指数,并为城市滨水区的规划和更新提供新的思路。

摘要：为了对G312线六盘山公路隧道洞内坍塌、结构开裂、衬砌劣化和背后空洞等病害进行处治,通过隧道检测、现场踏勘和资料收集,在充分掌握隧址区地质条件、设计施工、维修处治资料的基础上,对隧道病害原因及其发展进行分析和预测,提出了套拱加固和换拱加固2种处治方案,并从技术标准、施工安全、造价和环保角度进行加固方案论证。结果表明:隧道套拱加固方案在施工安全、造价和环境保护等方面均优于换拱加固方案。

摘要：医疗保险覆盖下,家庭可能会减少预防性储蓄量,同时也可能会调整资产结构。目前已有不少关于医疗保险与家庭消费关系的研究,但鲜有文献研究医疗保险与家庭资产结构的关系。利用2002年中国居民家庭收入调查(CHIPS)数据,本文探究了医疗保险对家庭资产选择的影响。我们发现医疗保险会显著改变城市和农村家庭的资产选择,参保家庭更加偏好较高风险水平的资产。本文的研究对于理解不确定性下的家庭投资行为具有重要的理论与实践意义。

摘要：Anisotanols A—D(1-4),four new compounds possessing an unprecedented sesquiterpenoid skeleton with a congested tricyclic 6/3/5 ring system,were obtained from Anisodus *** structures were elucidated by comprehensive spectroscopic techniques,and the absolute configurations were confirmed via ECD calculations and single-crystal X-ray diffractions.A putative biosynthetic pathway for these compounds was *** evaluation disclosed that compound 3 showed anti-angiogenic activity by inhibiting the viability,migration,and tube formation in HUVECs.

摘要：针对在役飞机电磁式接触器开合状态无法被监控、寿命信息无法被记录和智能化工作难以开展的问题,通过分析航空电磁式接触器的使用维护情况,研究电磁式接触器的工作特性、使用条件和寿命指标,提出了一种航空电磁式接触器的状态监测与寿命记录方法。根据电磁式接触器相关特性进行接通状态和工作状态分时监测,完成寿命信息统计记录,结合使用维护需求设计了一套显示交互界面,能够实现电磁式接触器接通状态正确判断、工作状态全时监测、寿命信息迭代记录,促进航空电磁式接触器由故障性维修向预防性维护发展。

摘要：便携式超短波通信设备是军事作战终端,具有小型化、小体积、低功耗的特点。随着软件无线电技术的不断发展成熟以及高集成、高功率系统级芯片(System on Chip,SoC)的应用,便携式超短波通信设备的电源系统设计,尤其是电源转换效率、电源电磁兼容设计等直接影响通信设备的可靠性。基于此,介绍便携式超短波通信设备的组成,并对电源系统的设计进行详细分析。

摘要：学生自主选课是混合式学习中的关键环节。在传统的选课模式中,学生往往难以根据个人兴趣选择课程,也无法清晰地查看课程的相关信息。为了解决传统选课模式中的这些问题,基于SQLServer开发平台设计了一套便捷、高效的学生选课管理系统。该系统不仅实现了混合式学习中数据的实时增删改查功能,还能够通过数据可视化帮助学生便捷地查询相关信息。在该系统中,学生可以根据个人情况选择课程,从而激发学习兴趣,并进一步提升学习效率。

摘要：自动增益控制(Automatic Gain Control,AGC)电路是接收机的重要组成部分,其作用是改善接收机的动态范围。采用反馈型自动增益控制结构,通过控制可变增益放大器AD603和电子开关,设计一个大动态范围快速闭环的AGC电路。实测结果表明,其动态增益控制范围为-10~+70 dB,闭环时间为30μs,能够广泛应用于各种定频、跳频通信,保证接收机正常工作。