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1.
本文介绍了开发城市地下空间的必然趋势及前景，阐明开发利用城市地下空间，对节省城市用地、节约能源、改善城市交通、减轻城市污染等都有着重要作用。 相似文献
2.
为研究雷帕霉素靶标激酶TOR在牡丹开花衰老过程中的生理作用，以牡丹（Paeonia suffruticosa Andr.）‘洛阳红’切花为试材，用0.01 μmol • L-1雷帕霉素预处理2 h后瓶插，并测定瓶插寿命、能量物质含量、糖分含量、乙烯释放速率、呼吸速率、MDA含量以及PsTOR、PsSnRK1和PsHXK1表达量变化。结果表明：雷帕霉素预处理可延长该牡丹切花的瓶插最佳观赏期和增大花朵的最大花径；另外，雷帕霉素预处理还可提高花瓣可溶性糖含量和能荷积累，降低呼吸耗能和MDA含量，并下调瓶插初期PsSnRK1和PsHXK1的表达水平，上调瓶插后期PsTOR和PsSnRK1的表达水平。说明雷帕霉素可通过TOR途径调控能量感知，延缓牡丹切花的开放和衰老进程，进而提高瓶插品质。 相似文献
3.
Zainal A. Muchlisin Putri I. Sarah Dhea F. Aldila Kartini Eriani Iwan Hasri Agung S. Batubara Firman M. Nur Mustaqim Mustaqim Cut Ruhul Muthmainnah Abinawanto Abinawanto Martin Wilkes 《Aquaculture Research》2020,51(4):1700-1705
Cryoprotectant is the crucial factor in the cryopreservation process. In general, there are two types of cryoprotectant, permeating and non‐permeating cryoprotectants. Dimethyl sulfoxide (DMSO) and egg yolk are common permeating and non‐permeating cryoprotectants respectively. Hence, the objective of the present study was to determine the best proportion of DMSO and egg yolk for the cryopreservation of Rasbora tawarensis sperm. A completely randomized experimental design was used in this study which involves two types of cryoprotectant and their combination at different concentrations, namely 5% DMSO, 5% egg yolk, 5% DMSO + 5% egg yolk and 2.5% DMSO + 2.5% egg yolk. Every treatment was conducted in three replicates. Combination of 5% DMSO + 5% egg yolk gave the best results cryoprotectant treatment had significant effects on sperm motility, fertilization and hatching rate of the R. tawarensis eggs (p < .05). It is concluded that the best proportion of cryoprotectants for sperm cryopreservation in this species is 5% DMSO + 5% egg yolk. 相似文献
4.
双峰驼的面神经在伸出茎乳突孔之前发出岩大神经、镫骨肌神经、鼓索和一加入岩小神经的交通支,并接受一条来自前庭耳蜗神经的交通支和迷走神经的耳支。面神经穿出茎乳突孔之后发出耳后神经、耳内支,腮腺支二腹肌支、颈支、耳睑神经,上颊支和下颊支。6/10例面神经发出一交通支连于舌咽神经。耳后神经与第一、第二颈神经之间不见有交通支。耳后神经和耳内支有侧支分布于腮腺和腮耳肌。上颊支在犬齿肌深面分为许多小支与眶下神经的分支形成一神经丛。下颊支在下颌骨的外侧面与颏副神经有较粗的交通支相连。 相似文献
5.
Haydar U. Zaman Mubarak A. Khan Ruhul A. Khan Sushanta Ghoshal 《Fibers and Polymers》2012,13(5):593-599
Coir fibers were modified with methyl acrylate (MA) mixed with methanol (MeOH) under thermal curing method at different temperatures (40?C80 °C) for different curing times (20?C60 min). A series of solutions of different concentrations of MA in methanol along with 2 % benzoyl peroxide, were prepared. Monomer concentration, curing temperature, and curing time were optimized with the extent of grafting of monomer and mechanical properties of cured fiber and found to be 30 % MA, 60 °C and 40 min curing time registered as better performance (Grafting (Gr) = 5.7 %, tensile strength (TS) = 72 %, elongation at break (Eb) = 88 %) than those of untreated fiber. For further improvement of the properties, untreated coir fibers were pretreated with gamma and UV radiations at different doses and then pretreated fibers were soaked in the optimized monomer and cured under optimum conditions. Coir fiber pretreated with UV radiation and grafted with optimized monomer showed the best properties such as Gr (7.12 %), TS (132 %), and Eb (153 %) over raw fiber. Water uptake and simulated weathering test of untreated and treated coir fibers were studied. 相似文献
6.
Haydar U. Zaman Mubarak A. Khan Ruhul A. Khan M. Arifur Rahman Lily R. Das Md. Al-Mamun 《Fibers and Polymers》2010,11(3):455-463
Jute fabrics (hessian cloth) reinforced polypropylene (PP) matrix composites (45 wt% fiber) were fabricated by compression
molding. Jute fabrics were treated with 2-hydroxyethyl methacrylate (HEMA) using ultraviolet radiation in order to improve
the mechanical properties of the composites. Concentration of HEMA, soaking time and radiation dose were optimized. It was
found that 15% HEMA in methanol along with photoinitiator Darocur-1173 (2 %), 10 min soaking time and 20th pass of radiation
rendered better performance. Urea of different concentrations (0.5–2 %) was incorporated with 15 % HEMA to monitor its effect
on the properties and 1 % urea revealed the best results. For the improvement of the properties, jute fabrics were treated
with potassium permanganate (KMnO4) solution in acetone of different concentrations (0.02, 0.03, 0.05, and 0.5 %) at different soaking times (1, 2, 3, and 5
min) before the composite fabrication. Optimized jute fabrics (jute fabrics treated with 0.03 % KMnO4) were again treated with HEMA (15 %) solution along with urea (1 %) and promising improvement of mechanical properties of
the composites was observed. Scanning electron microscopy, water uptake, soil degradation and thermal aging of the treated
and untreated composites were also performed. 相似文献
7.
Preparation of selective ion adsorbent by photo curing with acrylic and phosphoric acid on jute yarn
Md. Al-Mamun Mubarak A. Khan Ruhul A. Khan Haydar U. Zaman M. Saha S. M. F. Huque 《Fibers and Polymers》2010,11(6):832-837
Jute yarns were cured with acrylic acid (AA) and phosphoric acid (PA) using UV radiation in order to prepare selective ion
adsorbent. A series of formulations were prepared in methanol containing varying percentages of (10–70 %) of AA and 2 % photo-initiator
(PI) (Darocur-4043). jute yarns were soaked in this formulation for various soaking times (10–30 min) and cured under UV radiation
of different intensities (20–50 UV passes). Concentration of AA, soaking time and intensity of UV radiation were optimized
based on polymer loading (PL). The maximum PL (21 %) was observed for 50 % AA solution for 20 min soaking time at 40 UV passes.
Various formulations were prepared using 5–15 % (w/w) of phosphoric acid, 50 % AA and 2 % PI in methanol. Then jute yarns
were soaked in this solution for 20 min and irradiated at 40th UV pass. The concentration of PA was again optimized for maximum
PL. It was found that the formulation containing 10 % PA, 50 % AA, 38 % methanol and 2 % PI showed 70.95 % of PL. To investigate
the adsorbent behavior, a 10 ppm CuSO4 solution was prepared and then grafted yarns were soaked in the solutions for 30–300 min at different conditions. After withdrawing
the yarns, the remaining copper in the solution were measured by atomic absorption spectrophotometer (AAS). It was revealed
that copper was successfully removed by using the grafted jute yarns. 相似文献
8.
珍稀濒危昆虫——中华虎凤蝶的半纯饲料 总被引：1，自引：0，他引：1
本文报告了珍稀、濒危昆虫——中华虎凤蝶半纯饲料的二次正交筛选结果.方差分析表明:干酪素、抗坏血酸、酵母粉和杜衡叶粉的含量是影响该蝶幼虫历期、化蛹率及蛹重的主要因子;饲料经高压灭菌易导致化蛹率显著下降.17种配方中有5种较好.其中最佳配方的饲养结果:幼虫平均历期41.83天化蛹率50.00％,平均蛹重340.38mg,羽化率40.00％.鲜叶对照分别为:36.80天,69.43％,352.68mg和60.98％. 相似文献
9.
Sharmin N Khan RA Salmieri S Dussault D Bouchard J Lacroix M 《Journal of agricultural and food chemistry》2012,60(2):623-629
Methylcellulose (MC)-based films were prepared by solution casting from its 1% aqueous suspension containing 0.25% glycerol. Trimethylolpropane trimethacrylate (TMPTMA) monomer (0.1-2% by wt) along with the glycerol was added to the MC suspension. The films were cast and irradiated from a radiation dose varied from 0.1 to 10 kGy. Then the mechanical properties such as tensile strength (TS), tensile modulus (TM), and elongation at break (Eb) and barrier properties of the films were evaluated. The highest TS (47.88 PMa) and TM (1791.50 MPa) of the films were found by using 0.1% monomer at 5 kGy dose. The lowest water vapor permeability (WVP) of the films was found to be 5.57 g·mm/m(2)·day·kPa (at 0.1% monomer and 5 kGy dose), which is 12.14% lower than control MC-based films. Molecular interactions due to incorporation of TMPTMA were supported by FTIR spectroscopy. A band at 1720 cm(-1) was observed due to the addition of TMPTMA in MC-based films, which indicated the typical (C═O) carbonyl stretching. For the further improvement of the mechanical and barrier properties of the film, 0.025-1% nanocrystalline cellulose (NCC) was added to the MC-based suspension containing 1% TMPTMA. Addition of NCC led to a significant improvement in the mechanical and barrier properties. The novelty of this investigation was to graft insoluble monomer using γ radiation with MC-based films and use of biodegradable NCC as the reinforcing agent. 相似文献
10.
Haydar U. Zaman Avik Khan Ruhul A. Khan Tanzina Huq Mubarak A. Khan Md. Shahruzzaman Md. Mushfequr Rahman Md. Al-Mamun P. Poddar 《Fibers and Polymers》2010,11(2):258-265
Jute fabrics reinforced thermoset composites were prepared with different formulations using urethane acrylate oligomer, methanol,
and benzyl peroxide. Jute fabrics were soaked in the prepared formulations and fiber content in the composites was optimized
with the extent of mechanical properties. Among all the resulting composites, 55 wt% jute content at oligomer:methanol:benzyl
peroxide=75:24.5:0.5 (w/w/w) ratio showed best mechanical properties. The optimized jute fabrics were cured under UV radiation
at different intensities and their mechanical properties were measured. Jute fabrics were treated with potassium permanganate
(KMnO4) solution of different concentrations (0.01, 0.02, 0.03, and 0.05 wt%) for different soaking times (1–5 min) before the composite
fabrication. Optimized jute fabrics (jute fabrics treated with 0.02 wt% KMnO4 for 2 min soaking time) were soaked in the optimized formulation and cured under UV radiation at different intensities and
measured their mechanical properties. Scanning electron microscopic investigation showed that surface modification improves
fiber/matrix adhesion. Water uptake and soil degradation test of the treated and untreated composite samples were also performed. 相似文献