浅析B2C服装电子商务企业如何吸引风险投资

初创期B2C服装电子商务企业高风险、高投入、高预期收益的特性使我国B2C服装电子商务企业在发展过程中时刻伴随着风险投资的身影,但如何吸引风险投资是B2C服装电子商务企业面临的一个难题。文章在分析风险投资选择项目的标准的基础上,从创业管理团队、商业模式两个方面论述了初创期B2C服装电子商务企业如何吸引风险投资。     

S2O8^2-/V2O5-CeO2型固体超强酸催化剂的制备研究

以NH4VO3为原料,（NH4）2S2O8为浸渍液,添加少量稀土Ce^4＋,用沉淀-浸渍法制备出新型S2O8^2-/V2O5-CeO2固体超强酸催化剂,以合成乙酸苄酯作为探针反应考察不同条件下制备的超强酸的催化活性。研究发现,当加入CeO2量为催化剂总量的1．0％,焙烧温度为500℃,浸渍液浓度为1．5mol／L,焙烧时间为3h时,催化剂的活性最好。     

Olivine-norite rock detected by the lunar rover Yutu-2 likely crystallized from the SPA-impact melt pool

Chang’E-4 landed in the South Pole-Aitken (SPA) basin, providing a unique chance to probe the composition of the lunar interior. Its landing site is located on ejecta strips in Von Kármán crater that possibly originate from the neighboring Finsen crater. A surface rock and the lunar regolith at 10 sites along the rover Yutu-2 track were measured by the onboard Visible and Near-Infrared Imaging Spectrometer in the first three lunar days of mission operations. In situ spectra of the regolith have peak band positions at 1 and 2 μm, similar to the spectral data of Finsen ejecta from the Moon Mineralogy Mapper, which confirms that the regolith''s composition of the landing area is mostly similar to that of Finsen ejecta. The rock spectrum shows similar band peak positions, but stronger absorptions, suggesting relatively fresh exposure. The rock may consist of 38.1 ± 5.4% low-Ca pyroxene, 13.9 ± 5.1% olivine and 48.0 ± 3.1% plagioclase, referred to as olivine-norite. The plagioclase-abundant and olivine-poor modal composition of the rock is inconsistent with the origin of the mantle, but representative of the lunar lower crust. Alternatively, the rock crystallized from the impact-derived melt pool formed by the SPA-impact event via mixing the lunar crust and mantle materials. This scenario is consistent with fast-cooling thermal conditions of a shallow melt pool, indicated by the fine to medium-sized texture (<3 mm) of the rock and the SPA-impact melting model [Icarus 2012; 220: 730–43].     

Diagnosis of CO2 dynamics and fluxes in global coastal oceans

Global coastal oceans as a whole represent an important carbon sink but, due to high spatial–temporal variability, a mechanistic conceptualization of the coastal carbon cycle is still under development, hindering the modelling and inclusion of coastal carbon in Earth System Models. Although temperature is considered an important control of sea surface pCO₂, we show that the latitudinal distribution of global coastal surface pCO₂ does not match that of temperature, and its inter-seasonal changes are substantially regulated by non-thermal factors such as water mass mixing and net primary production. These processes operate in both ocean-dominated and river-dominated margins, with carbon and nutrients sourced from the open ocean and land, respectively. These can be conceptualized by a semi-analytical framework that assesses the consumption of dissolved inorganic carbon relative to nutrients, to determine how a coastal system is a CO₂ source or sink. The framework also finds utility in accounting for additional nutrients in organic forms and testing hypotheses such as using Redfield stoichiometry, and is therefore an essential step toward comprehensively understanding and modelling the role of the coastal ocean in the global carbon cycle.     

2000—2019年青藏高原积雪时空变化

积雪是冰冻圈最重要的组成部分,影响着大气环流和区域水量平衡,对气候变化十分敏感。本文基于2000—2019年MODIS/Terra积雪产品数据,探讨了青藏高原近20年积雪的年内、年际和季节性时空特征及其变化趋势。结果表明：①2000—2019年青藏高原积雪以短期积雪为主,积雪期在1个月及以下时间段内的积雪空间分布范围最广,占积雪总面积的72.91%;积雪期越长,多年平均积雪率（SCR）越高,SCR呈高原四周山脉高,而羌塘高原、江河源区、柴达木-黄湟高中盆地等地低的特点。②2000—2019年积雪面积呈反复的先波动增加再波动减少,距平变化率在-15.97%~11.52%之间。横断山区、帕米尔高原以及羌塘高原大部分地区的SCR呈明显减少趋势;高原四周极大/大起伏高山/极高山区、江河源丘状高山原和江河上游中/大起伏高山区的SCR呈显著增加趋势。③年内积雪面积呈双峰型周期变化趋势,3月和11月达到峰值,8月达到谷值,与该区域多年平均气温、降水等气候因子的年内周期性变化相反。青藏高原冬季积雪分布最广,秋季和春季积雪范围次之,夏季积雪范围最小;2000—2019年,青藏高原东部和南部冬季积雪显著增加、秋季和春季积雪显著减少,青藏高原整体夏季积雪显著减少。④近20年,青藏高原积雪与气温、降水的相关程度均较强,积雪覆盖范围与气温呈负相关关系,与降水呈正相关关系。研究结果有助于掌握青藏高原冰雪融水变化情况,对区域水量平衡和气候变化有重要指示作用。     

Responses to oral glucose challenge differ by physical activity volume and intensity: A pilot study

BackgroundOne-hour postprandial hyperglycemia is associated with increased risk of type 2 diabetes and cardiovascular disease. Physical activity (PA) has short-term beneficial effects on post-meal glucose response. This study compared the oral glucose tolerance test results of 3 groups of people with habitually different levels of PA.MethodsThirty-one adults without diabetes (age 25.9 ± 6.6 years; body mass index 23.8 ± 3.8 kg/m²; mean ± SD) were recruited and divided into 3 groups based on self-reported PA volume and intensity: low activity < 30 min/day of moderate-intensity activity (n = 11), moderately active ≥ 30 min/day of moderate-intensity PA (n = 10), and very active ≥ 60 min/day of PA at high intensity (n = 10). Participants completed an oral glucose tolerance test (50 g glucose) with capillary blood samples obtained at baseline, 15 min, 30 min, 45 min, 60 min, 90 min, and 120 min post-ingestion.ResultsThere were no significant differences between groups for age or body fat percentage or glycated hemoglobin (p > 0.05). The groups were significantly different in terms of baseline glucose level (p = 0.003) and, marginally, for gender (p = 0.053) and BMI (p = 0.050). There was a statistically significant effect of PA on the 1-h postprandial glucose results (p = 0.029), with differences between very active and low activity groups (p = 0.008) but not between the moderately active and low activity groups (p = 0.360), even when baseline glucose level and gender differences were accounted for. For incremental area under the curve there was no significant effect of activity group once gender and body fat percentage had been accounted for (p = 0.401). Those in the low activity group took 15 min longer to reach peak glucose level than those in the very active group (p = 0.012).ConclusionThe results suggest that high levels of PA have a beneficial effect on postprandial blood glucose profiles when compared to low and moderate levels of activity.     

NiCo_2O_4纳米结构阵列的水热合成与氧析出特性研究

钴酸镍纳米材料具有良好的电催化氧析出反应(Oxygen Evolution Reaction,OER)活性,是一种很有发展潜力的非贵金属电催化材料。文章以碳纤维纸为基底,采用水热合成的方法对纳米结构钴酸镍的生长进行了系统的研究,分别考察了生长温度、前驱体浓度和配比、生长时间对产物的形貌、尺寸、物相结构、OER电化学性能的影响,通过对比分析后发现在生长温度100℃、生长时间5h、镍钴比为2:1时所获得的多孔片状钴酸镍纳米结构具有最佳的OER特性。     

一种基于模糊语言TOPSIS的应急决策方法

在应急决策过程中,决策信息通常具有犹豫性、模糊性和非对称性,且决策者呈现出直观、快速的语言决策偏好。提出一种基于模糊语言TOPSIS的应急决策方法,使用犹豫模糊语言术语集和二元语义表达式对高度不确定环境下的语言进行处理,提高对犹豫模糊语言信息的提取能力,生成易于理解的语言评估结果,从而辅助决策者进行快速、准确的决策判断。案例证实该方法的可行性与有效性,为解决应急决策问题提供了一种新方法。     

ONP脱墨浆的可漂性研究

ONP脱墨浆往往需要进一步漂白。对5种用不同脱墨剂处理的ONP脱墨浆进行了H2O2漂白实验,结果表明不同脱墨剂处理的ONP白度增加幅度不相同,各脱墨浆的可漂性并不相同。实际使用ONP脱墨浆时需考虑其漂后白度增幅潜力。     

Utility of P-SEP,sTREM-1 and suPAR as Novel Sepsis Biomarkers in SARS-CoV-2 Infection

The coronavirus disease 2019 is a highly contagious viral infection caused by SARS-CoV-2 virus, member of coronaviridae family. It causes life threatening complications due to complexity and rapid onset course of the disease. Early identification of high-risk patients who require close monitoring and aggressive treatment remains challengeable till date. Novel biomarkers which help to identify high risk patients at the early stage is high priority. Objective of this review to find utility of P-SEP, sTREM-1 and suPAR for diagnosis, risk stratification and prognosis of SARS-CoV-2 infected cases. Soluble receptors like, P-SEP, sTREM-1 and suPAR have been involved in immune regulation in SARS-CoV-2 infection and elevate more in severe cases. A comprehensive research of databases like PubMed, EMBASE, CNKI and Web of Science was performed for relevant studies. A total of nine out of fifteen research literature in initial screening were included for this review. Interestingly all studies have reported high levels of P-SEP, sTREM-1 and suPAR in SARS-CoV-2 infected cases and the biomarkers positively correlated with severity of infection. This implies that P-SEP, sTREM-1 and suPAR can be implemented as surrogate marker in blood profile for early diagnosis, risk stratification and prognosis in SARS-CoV-2 for better management in Indian population at the current situation.