不良饮食易使女性疲劳

同事王女士，在工作之余常常诉说：自己不少吃，不少喝，但总有疲劳感，去医院检查也没什么大病，这让她很纳闷。     

烟草赤星病拮抗菌Q96的筛选鉴定及其防病效果研究

为分离筛选对烟草赤星病有良好防效的拮抗菌,以烟草赤星病链格孢菌为靶菌,从蚯蚓粪中经初筛和复筛获得拮抗菌,通过形态、生理生化特征和16S rDNA分析鉴定拮抗菌种类,并对烟草赤星病的防治效果进行了研究。结果表明,筛选出一株拮抗菌Q96,初筛和复筛的抑菌率均超过60%,经鉴定为副地衣芽孢杆菌（Bacillus paralicheniformis）,其活菌液（稀释10倍）对孢子萌发和菌丝生长的抑制率分别为73.33%和79.68%,粗发酵液离体防效可达60.04%。Q96菌株可作为抗烟草赤星病生防菌剂的菌种资源。     

满足用户个性化需求的积木式产品设计研究

文章探讨了体验经济时代下积木式产品因何受到消费者青睐,以及在积木式产品生产、使用过程中设计师与用户角色的转变,并从设计角度提出对积木式产品开发的思考。     

助推滑翔导弹对地攻击快速下压弹道设计

为了研究助推滑翔导弹针对地面固定目标的快速打击方法,通过受力分析,提出一种新的弹道下压段俯冲弹道模型。采用翻身下压的飞行方式,使导弹主升力面朝下,弹道下压过程中以正攻角下压为主,延后并缩短了负攻角的使用时间,获得了更快的弹道下压速率。以美国CAV-H为研究对象,利用高斯伪谱法进行弹道仿真计算,并与传统弹道下压方式进行对比。结果表明,与传统弹道下压方式相比,翻身下压具有更高的弹道下压效率及在高速飞行的高热流区保持正攻角飞行的特点。对于采用腹部防热设计的助推滑翔导弹,在实现弹道快速下压的前提下,有效杜绝了热流向背部蔓延,提高了俯冲攻击过程中导弹的安全性。     

气相色谱法测定植物源性食品中百菌清农药残留的不确定度评估

通过对气相色谱法测定番茄中的百菌清的不确定度进行系统性评估,阐述了测量结果不确定度的主要来源为标准溶液的配置、样品溶液的制备、回收率及标准曲线拟合四部分,并对这些不确定度分量进行量化计算及合成。得到其所测的量值及扩展不确定度为珔ω=(0.120)mg/kg,(k=2)。通过评估,得出影响百菌清含量测定不确定度的主要影响因素为标准曲线拟合。     

Incorporation of Si-Ninducing white light of SrAl_2Si_2O_8：Eu~（2＋）,Mn~（2＋） phosphor for white light emitting diodes

Photoluminescence (PL) and colorimetric properties of white-light emission SrAl2Si2O8:Eu2+,Mn2+ phosphor were tuned effectively through incorporating Si-N bond to the host in the form of Si3N4. A maximum solubility of Si-N bond in SrAl2-xSi2+xO8-xNx was estimated theoretically to be in a value of x=1.0. Under 365 nm irradiation, a distinct red-shift of blue band emission from 406 to 473 nm for Eu2+ and an enhancement of yellow band emission peaked at ~565 nm for Mn2+ were observed with the increase of Si-N ...     

Color tuning of Eu-Tb co-doped borophosphate glasses for white light through valence state adjustment

The dependence of color points of white light on the composition of borophosphate glasses co-doped with europium (Eu) and terbium (Tb) has been investigated in terms of valence change of rare earth ions. Under ultraviolet (UV) excitation, the white light is observed to be from a combination of 4f65d→4f7 band transition emission at 425 nm for Eu2+, 5D0→7FJ (J=1, 2) line-emissions at 593 nm and 611 nm for Eu3+, and 5D4→7F5 band transition emission at 545 nm for Tb3+. By varying the glass compositi...     

改性γ-氧化铝催化1,4-丁二醇脱水制备四氢呋喃

为探究不同催化剂对1,4-丁二醇脱水反应的影响,以γ-氧化铝(γ-Al2O3)为载体,通过共沉淀法制备不同硅含量的γ-Al2O3,利用X射线衍射、扫描电镜、N2吸脱附等表征了焙烧温度对γ-Al2O3形貌、孔结构的影响.采用等体积浸渍法制备了Fe2O3-Al2O3和CuO-Al2O3,考察了负载不同金属的γ-Al2O3对1,4-丁二醇脱水反应的影响.结果表明,改性γ-Al2O3的催化活性与其前驱体的焙烧温度相关,催化剂前驱体在500℃进行热处理时得到的 γ-Al2O3对1,4-丁二醇反应的催化效率最高;铜元素的加入会降低γ-Al2O3的催化能力,负载金属为铁时1,4-丁二醇的转化率和四氢呋喃的收率明显提高.在反应温度以60℃/h的速率升至200℃、催化剂用量为5.0％(相对于1,4-丁二醇用量)、反应时间为7 h的条件下,γ-Al2O3对1,4-丁二醇反应的催化效率最高,1,4-丁二醇脱水反应的转化率和选择性均可达到99％.     

Composition-induced valence variation of europium and the photoluminescence properties for Eu2+ doped borophosphate luminous glass in air

A simultaneous blue-light and red-light emitting glass of SrO-B2O3-P2O5 doped with Eu2O3 is prepared in air, and then heat-treated without any reductive reagent. A transition combination is found to consist of a band emission peaked around 430 nm and a series of line emission from 593 nm to 611 nm, corresponding to the typical 4f65d→ 4f7 transition of Eu2+ and 5D0 → 7FJ (J = 0, 1, 2, 3, 4) transitions of Eu3+, respectively. Some unidentified crystals such as Sr (PO3)2 and SrB2O4 as hosts for Eu2...