摘要：Water loss rate is crucial in evaluating the efficiency of atmospheric water harvesting(AWH)***,most moisture-absorbing salts and gels have fixed heat transfer rates,limiting the development of high-performance AWH ***,an anisotropic PEG/CS/MF nanocomposite(APCM)with adjustable thermal transfer efficiency is *** was synthesized using polyethylene glycol(PEG),melamine foam(MF),and chitosan(CS)solution through a freeze orientation *** resulting material exhibits a stable oriented laminated structure formed by hydrogen bonding between PEG,CS,and *** unique structure imparts excellent mechanical ***’s large lamellar gaps and pore diameters enable rapid absorption of atmospheric water molecules at low temperatures without leakage(61.79 kg m^(−3)).The compressible nature of APCM allows for efficient heat transfer at high temperatures,and the release of 80%of absorbed water within 15 *** a proof-of-concept demonstration using a custom-built AWH device,each cubic meter of APCM achieved three AWH cycles within 24 h,producing over 185 kg of ***,this innovative design offers a promising solution for enhancing the efficiency of AWH,potentially addressing water scarcity issues in various regions.

摘要：壳聚糖富含氨基、羟基等活性基团,可与染料形成配合物。此外,壳聚糖具有生物降解性、生物相容性、成本低和资源丰富等特点,是一种绿色无污染的材料。然而,壳聚糖的有机凝胶结构单一,限制了其对染料的吸附性能。为了克服这个挑战,研究使用壳聚糖和醋酸铜制备了具有三维网络结构的金属有机凝胶。通过调节壳聚糖和醋酸铜的配比,可以调控凝胶的结构、比表面积和孔隙,并研究其染料吸附机理。研究结果显示,这种具有三维网络结构的金属有机凝胶对甲基橙染料的去除率达到了49%。干凝胶对甲基橙染料的吸附符合Freundlich等温吸附模型,从动力学角度分析属于拟一级动力学,表明它是可逆的物理吸附过程,染料可进行二次利用。壳聚糖基金属有机凝胶在染料吸附领域具有广阔的应用前景。

摘要：为了探讨相同灌水量、不同灌溉方式对宁夏盐池地区苜蓿产量、经济效益及水分利用效率的影响,试验设计了大水漫灌、喷灌和埋深分别为10,20,30 cm 3种地下滴灌处理,分析了不同灌溉方式下的水分分布特点、水分利用率及苜蓿的产量和经济效益。结果表明:在0～100 cm深的土层中,相同灌水量、不同灌溉方式下土壤的含水率呈地下滴灌>大水漫灌>喷灌的趋势,分别为21.20%、19.13%、18.38%;不同灌溉方式的水分利用率为地下滴灌>大水漫灌>喷灌,分别为5.2,5.0,4.9 kg/m^3;全年风干草总产量以埋深30 cm的地下滴灌年产量最高,为16 191.75 kg/hm^2,显著高于喷灌的产量(14 670.15 kg/hm^2,P 0.05);埋深为30 cm的地下滴灌处理纯利润(19 673.40元/hm^2)显著高于喷灌的纯利润(17 238.45元/hm^2,P<0.05),收益提高14.1%。说明埋深为30 cm的地下滴灌可有效提高灌溉水的利用效率和苜蓿收益,该灌溉方式可在宁夏盐池干旱半干旱地区进行大面积推广应用。

摘要：设计了以单稳态触发器为核心元件的符合/反符合核电子学实验电路,该电路在使用上,一方面可选择矩形脉冲输入信号,通过信号的上升沿和下降沿触发不同的单稳态触发器,2个单稳态的输出构成了2路有时间间隔的输入信号,单稳态的输出脉冲宽度为成形时间;另一方面,可用单稳态输出信号的后沿去触发下一级电路,实现延迟时间为单稳态宽度的输出信号.教学实践表明:该电路能够很好地完成相关实验教学,并能够让学生更好地熟悉和掌握符合、反符合、延迟符合、延迟反符合电路的特点.

摘要：The aim of this study was to evaluate the efficacy of mosaicplasty with tissue-engineered cartilage for the treatment of osteochondral defects in a pig model with advanced MR technique. Eight adolescent miniature pigs were used. The right knee underwent mosaicplasty with tissue-engineered cartilage for treatment of focal osteochondral defects, while the left knee was repaired via single mosaicplasty as controls. At 6, 12, 18 and 26 weeks after surgery, repair tissue was evaluated by magnetic resonance imaging （MRI） with the cartilage repair tissue （MOCART） scoring system and T2 mapping. Then, the results of MRI for 26 weeks were compared with findings of macroscopic and histologic studies. The MOCART scores showed that the repaired tissue of the tissue-engineered cartilage group was statistically better than that of controls （P 〈 0.001）. A significant correlation was found between macroscopic and MOCART scores （P 〈 0.001）. Comparable mean T2 values were found between adjacent cartilage and repair tissue in the experimental group （P 〉 0.05）. For zonal T2 value evaluation, there were no significant zonal T2 differences for repair tissue in controls （P 〉 0.05）. For the experimental group, zonal T2 variation was found in repair tissue （P 〈 0.05）. MRI, macroscopy and histology showed better repair results and bony incorporation in mosaicplasty with the tissue-engi- neered cartilage group than those of the single mosaicplasty group. Mosaicplasty with the tissue-engineered cartilage is a promising approach to repair osteochodndral defects. Morphological MRI and T2 mapping provide a non-invasive method for monitoring the maturation and integration of cartilage repair tissue in vivo.

摘要：随着"海洋意识"的觉醒和"一带一路"的开启,海洋已经成为各个学科不可回避的话题。无论是"海洋文化"建构,还是"一带一路"建设,都是系统性的工作,不但包括经济、历史、宗教、民俗等研究,还包括各艺术门类的实践。艺术与现实具有互生关系,热带海洋题材"中国画"的繁荣将极大地推动国家文化战略与经济战略进程。古今中外海洋绘画都不丰富,热带海洋绘画更是如此;热带海洋题材中国画的色彩选择受到两大绘画系统现代性叙事的影响,即中国传统绘画由重"水墨"到重"用彩",西方油画用色由重"再现"到重"表现";热带海洋绘画色彩的选择还将受到具体呈现景观的自然色性、热带海洋历史叙事的心理色、人文文化色等影响。对热带海洋绘画的研究,具有极高的绘画史价值、艺术实践价值,同时也具有建构海洋文化,深化南海历史文化研究,推动海南自由港建设,宣示三沙主权、培育国人主权意识等价值。总之,包括色彩在内的这一题材绘画研究具有极为重要的"国家艺术战略"价值。