摘要：抗辐照电机驱动器研发需要准确获取电桥电路金属-氧化物半导体场效应晶体管(Metal Oxide Semiconductor Field Effect Transistor,MOSFET)器件的总剂量效应失效阈值,电流-电压、电容-电压等离线测试方法,无法真实反映器件开关性能随累积剂量增加的连续变化过程。因此,针对MOSFET器件总剂量效应的在线测试需求,设计了基于高速信号采集及存储的通用化测试系统,具备被测样品驱动、高频信号采集、高速数据存储、数据模块管理等功能。利用典型商用MOSFET器件开展了总剂量效应测试,结果显示,当吸收剂量达598.08±41.54 Gy(Si)时,样品采集方波波形开始出现异常,低电平电压升高至0.82 V,高电平电压始终正常;随着累积剂量的增大,低电平电压持续性升高至1.08 V,并进一步升高至1.24 V,但器件开关功能保持正常;当累积剂量达1775.41±219.68 Gy(Si)时,采集波形跳变为2.93 V的直线,无方波信号输出,经判断MOSFET开关功能完全受损。

摘要：Keeping beef cattle outdoors during winter reduces costs and improves animal welfare, but increases the risk of nitrogen (n) and phosphorus (P) runoff losses. This study evaluated a rotational pen design on grassland with two groups of suckler cows given access to an expanding staying area and a new feeding area each week (72 cattle ha-1), with one month’s stay per pen. The spatial distribution of excreta and effects on n and P surface runoff was evaluated during six months. The total excreta loads corresponded to 500 kg·n·ha-1 and 50 kg·P·ha-1. new feeding areas did not distribute excretions evenly, which resulted in the highest proportion of excretions (31%) occurring in the first week’s sub-area. The topsoil had significantly higher amounts of mineral-n, mainly as nH4-n (29 - 81 kg·ha-1), than an unaffected area (13 kg·ha-1). Mean total runoff losses were similar for both groups (1.4 kg·P·ha-1 and 9.0 kg·n·ha-1). Around 78% of n and 70% of P runoff losses occurred during the month with cattle present. During the first two weeks with heavy rain, n and P runoff losses were 50% higher from an area with suckler cows than a corresponding vegetated sub-area without cows. The study design did not provide a sufficient distribution of excretions and a high animal density in combination with trampling resulted in unacceptable n and P run-off losses. An environmentally friendly design would need to include frequent moving of all equipment and access to larger areas.

摘要：四氢喹啉衍生物是一类重要的含氮杂环化合物。经典的波瓦罗夫(Povarov)合成四氢喹啉衍生物的方法存在底物适用范围受限的问题。近年来,以n,n-二烷基芳胺与烯烃或马来酰亚胺合成四氢喹啉衍生物的研究成果,具有底物适用范围广、原子经济性较强的特点。

摘要：开发具有抗光漂白、斯托克斯位移(Stokes shift)大、生物相容性优异等特性的肿瘤细胞长效示踪应用型荧光染料已成为现阶段生物成像领域的研究热点.本工作以具有优异光学性质的苯并噻二唑(BTD)为荧光母核,通过引入n,n-二甲基取代磺酰胺基团提升荧光染料的生物相容性及溶解性,设计合成了给体-受体-给体(D-A-D)型荧光染料(SIBIS).SIBIS具有聚集诱导发光效应(AIE)、较大的Stokes shift(155 nm)、极低的细胞毒性等特性.不同细胞系内吞结果表明SIBIS可靶向活细胞溶酶体,肿瘤细胞内长效示踪研究表明SIBIS可有效示踪小鼠乳腺癌4T1细胞分裂15代以上.因此,SIBIS可作为肿瘤细胞长效示踪剂,并有望应用于溶酶体相关炎症和疾病示踪.

摘要：以硅藻泥为硅源合成了ZSM-5分子筛;以三聚氰胺为前驱体制备g-C_(3)n_(4),将合成的分子筛(未去除模板剂)与三聚氰胺混合加热,去除模板剂的同时,合成ZSM-5分子筛@g-C_(3)n_(4)。分别用XRD,SEM,TEM,EDS,DTA等对样品进行表征分析,以亚甲基蓝模拟目标污染物,分别考察ZSM-5分子筛@g-C_(3)n_(4)投加量,亚甲基蓝溶液pH,初始浓度和光催化时间对光催化性能的影响。实验结果表明,在样品投加量为8 g·L^(-1)、光照时间为3 h,亚甲基蓝初始浓度为5 mg·L^(-1)、pH=11时对亚甲基蓝去除率可达到92.43%。

摘要：Graphene-like n,S-codoped bio-carbon nanosheets(GnSCS) were prepared by a facile and environment-friendly naCl non-aqueous ionic liquid route to house sulfur for lithium-sulfur battery. The natural nori powder was calcined at 900°C for 3 h under Ar, in which naCl non-aqueous ionic liquid can exfoliate carbon aggregates into nanosheets. The structural characterization of GnSCS by a series of techniques demonstrates the graphene-like *** evaluated as the matrix for sulfur cathode, GnSCS/S exhibits more prominent cycling stability and rate capability.A discharge capacity of 548 mA h g-1 at a current density of 1.6 A g-1 after 400 cycles was delivered with a capacity fade rate of only 0.13% per cycle and an initial Coulombic efficiency(CE) as high as 99.7%. When increasing the areal sulfur loading up to 3 mg cm-2, the discharge capacity can still be retained at 647 mA h g-1 after more than 100 cycles with a low capacity degradation of only ~0.30% per cycle. The features of n/S dual-doping and the graphene-like structure are propitious to the electron transportation, lithium-ion diffusion and more active sites for chemically adsorbing polysulfides. It is anticipated that other functional biochar carbon can also be attained via the low-cost, sustainable and green method.

摘要：In previous studies, n,O-carboxymethyl chitosan has been shown to decrease the incidence and intensity of abdominal adhesions. In the present study, adhesions were induced in 220 rabbits using a double uterine horn model. Rabbits were randomized to receive an operation only or an operation+medical chitosan intraperitoneally. Twenty-two rabbits from each group were euthanized at one of five different times(Day 3, 7, 14, 28, or 42), and adhesion formation was given gross and histopathological scores. Reductions were observed in adhesion extent(P=0.0337) and tenacity(P=0.0271) as well as inflammation(P<0.0001) on Day 3 when medical chitosan was applied. Prior to Day 14, fibrosis was less obvious in the medical chitosan group(P<0.0005). The tenacity scores were significantly lower in the medical chitosan group following Day 14(P<0.05), while the type scores were lower in the medical chitosan group following Day 28(P<0.03). Thus, medical chitosan decreased both the gross and the histopathological scores of the induced adhesions.

摘要：为掌握新疆南疆某规模牛场牛病毒性腹泻病毒(BVDV)感染的基因型,将该规模牛场所采集的血清样本经BVDV抗原ELISA检测阳性后作为PCR检测样本,针对BVDV基因组中5′-UTR、n^(pro)基因设计特异性引物,进行RT-PCR扩增,然后将目的基因进行测序、BLAST比对和序列分析,并构建系统发育树。结果显示,该规模牛场4份样本皆为BVDV-1c型。本研究结果为南疆规模牛场制定科学合理的牛病毒性腹泻防控措施以及选择相应疫苗提供了理论参考。

摘要：以n,n-二甲基甲酰胺(DMF)作为唯一碳、氮源,从高盐环境中筛选耐盐DMF高效降解菌DMF-4,并对其降解DMF的特性进行研究。经鉴定,DMF-4为环太芽孢杆菌(Bacillus circulans),其在盐度为3%,温度为30℃的条件下培养48 h,对1000 mg/L DMF的降解率可达47.7%。DMF-4降解DMF的适宜条件为初始pH 6.0~7.0,DMF初始质量浓度3000~4000 mg/L,温度30~40℃,盐度1%~3%;葡萄糖和醋酸钠可明显促进菌株DMF-4的生长和对DMF的降解效果。菌株DMF-4对高盐与高温皆有较好的耐受性,在工业污水处理领域具有广阔的应用空间。

摘要：提出了一种混合翼设计方法,用于民机机翼结冰风洞试验。采用navier-Stokes(n-S)方程计算翼面压力分布,以混合翼与原始翼型的前缘附近压力系数分布尽可能重合为目标,提出了一种简易影响系数及控制点线性插值的方法,在保证前缘附近与原始翼型相同的基础上混合翼的设计弦长缩短40%。在同一迎角下设计得到的混合翼能与原始翼型具有相同的前缘附近压力分布,从而保证两者具有相同的水滴撞击特性及结冰情况。设计理论和设计结果为开展相关民机型号的结冰风洞试验打下基础。