基于深度学习的手写书法字体识别算法

为解决因手写书法作品种类繁多而识别困难的问题,降低人们观赏书法的门槛,本文提出了基于深度学习的手写书法字体识别算法.识别过程中首先使用投影法等图像处理方法对书法作品图像中的汉字进行定位和分割,然后分别利用GoogLeNet Inception-v3模型和ResNet-50残差网络进行书体风格识别和字形识别.实验结果表明,本文算法能实现对整幅书法作品中楷书和篆书的书体风格以及字形的识别,对楷书和篆书单字的识别率分别为91.57%和81.70%,达到了实用的需求.     

基于生成对抗网络的文本生成图像算法

文本生成图像算法对生成图像的质量和文本匹配度有很高的要求. 为了提高生成图像的清晰度, 在现有算法的基础上改进生成对抗网络模型. 加入动态记忆网络、细节校正模块(DCM)、文本图像仿射组合模块(ACM)来提高生成图片的质量. 其中动态记忆网络可以细化模糊图像并选择重要的文本信息存储, 以提高下一阶段生成图像的质量. DCM纠正细节, 完成合成图像中缺失部分. ACM编码原始图像特征, 重建与文本描述无关的部分. 改进后的模型实现了两个目标, 一是根据给定文本生成高质量的图片, 同时保留与文本无关的内容. 二是使生成图像不再较大程度依赖于初始图像的生成质量. 通过在CUB-200-2011鸟类数据集进行研究实验, 结果表明相较之前的算法模型, FID (Frechet inception)有了显著的改善, 结果由16.09变为10.40. 证明了算法的可行性和先进性.     

Thermally stable and durable superhydrophobic surfaces on stainless steel sheets with microholes via acid pretreatment and modification with self-assembled monolayers

Microfluidics and Nanofluidics - Single-cell nucleic acid analysis aims at discovering the genetic differences between individual cells which is well known as the cellular heterogeneity. This...     

Tritium concentrations in precipitation in Shanghai

Tritium concentrations in precipitation can be used as a criterion to evaluate the tritium baseline of the environment. The tritium concentration in precipitation in Shanghai during 2014-2015 was determined. Values ranged from 0.68 ± 0.04 to 4.11 ± 0.39 Bq/L, and it showed a decreasing trend compared with historical data; however,the values were slightly higher than the natural background tritium level. Additionally, the tritium concentration shows a seasonal variation: It was higher in autumn and winter and lower in summer and spring. A comparison of concentrations in precipitation in Shanghai and around the Qinshan Nuclear Power Plant reveals no correlation,implying that the nuclear power plant operations may not affect the environment of Shanghai. Thus, the raised tritium concentrations in Shanghai might be due to the effects of monsoons, spring leak, raindrop, or other activities that generate tritium there. Those activities may include chemistry research that uses tritium as a tracer.     

Two-Dimensional Terahertz Time-Domain Spectroscopy and Its Applications

In this work, we review the developing progress of two-dimensional terahertz time-domain spectroscopy (THz-TDS) and its diverse applications, including analyzing the polarization of THz radiation from a laser-induced plasma source and studying the corresponding physical mechanism, and characterizing the optical properties of crystals, etc.     

Photoreduction of Reactive Brilliant Red X-3B by Ultraviolet Irradiation/Potassium Borohydride/Sodium Bisulfite

Photoreduction of Reactive Brilliant Red X-3B in aqueous solution by ultraviolet irradiation/potassium borohydride/sodium bisulfite (UV/KBH4/NaHSO3) was investigated. The effects of operational parameters including KBH4 dosage, NaHSO3 dosage, pH value, and temperature were studied. The reaction mechanism was also discussed. The preliminary results showed that UV and KBH4/NaHSO3 had a significant synergy for the decolorization. At the conditions of 6-mg KBH4, 250-mg NaHSO3, pH 6.0, and room temperature, highest color removal percentage was achieved. From the mechanism discussion, we could conjecture that the mechanism of photoreduction was mainly caused by the production of sulfur dioxide anion radicals, and UV irradiation played a vital role during the process.     

Balance of 0, 1 bits for Huffman and reversible variable-length coding

This letter proposes a novel algorithm to obtain a suboptimal solution for the balance of bit distribution after Huffman coding. The algorithm is simple, and can be embedded in the conventional Huffman coding process. In addition, the letter also discusses the bit-balance problem for reversible variable-length codes (RVLCs) based on Huffman coding. Analytical and experimental results suggest that the new algorithm is very useful in improving the 0/1 balance property for Huffman codes and RVLCs.     

添加剂对Y2Ti2O7陶瓷的微波介电性能的影响（英文）

研究了CrO3、Nb2O5、SiO2及Al2O3对Y2Ti2O7陶瓷的烧结性能、相组成和微波介电性能的影响.其中Nb2O5掺杂能够降低Y2Ti2O7陶瓷材料的烧结温度,提高基体陶瓷的介电常数和品质因子,引起谐振频率温度系数的明显变化.且随着Nb2O5含量的增多,所有样品的主晶相仍为立方烧绿石型Y2Ti2O7,Nb5+可能进入烧绿石结构中,部分取代Ti4+所在位置.实验结果表明:1mol%Nb2O5掺杂的陶瓷材料在1420℃下烧结致密,具有最佳的微波介电性能:εr=61.8,Q×f=9096GHz(f=5.494GHz),τf=54×10-6/℃.     

贝类毒素大田软海绵酸的免疫分析检测技术研究进展

大田软海绵酸(okadaic acid, OA)是一种广泛存在于贝类等生物中的海洋生物毒素, 可引起人或动物的急性中毒, 对食品安全和海产养殖具有严重危害。因此建立快速、可靠、灵敏的OA检测技术具有重要意义。免疫分析检测技术基于抗原抗体的结合, 特异性强、灵敏度高、应用范围广, 是当前检测贝类毒素OA的主要手段。本文综述了近年来针对贝类毒素OA的免疫分析检测技术, 其中包括酶联免疫吸附检测、免疫层析检测、时间分辨荧光免疫检测和基于免疫传感器的检测技术等。本文着重阐述了不同免疫分析技术的原理及其OA检测的实际应用, 同时探讨了免疫分析技术在贝类毒素OA检测方面的挑战和发展趋势, 以期为开发性能更加优异的OA免疫检测技术提供研究思路。     

超声提取柿果皮总三萜酸工艺优化

目的采用正交法优化柿果皮中总三萜酸的超声提取工艺。方法以"牛心柿"柿果皮为原料,利用紫外分光光度计法测定柿果皮中总三萜酸的含量,并从提取溶剂选择及其浓度、料液比、超声时间和温度等方面,通过单因素实验和正交试验确定超声提取柿果皮总三萜酸的最佳条件。结果最佳超声提取工艺为:在超声功率240 W的前提下,提取溶剂为75%(V/V)的乙醇、料液比1:15(m/V)、时间45 min、温度50℃。在此条件下,柿果皮总三萜得率最高可达39.33mg/g。结论优化后的方法简单、快速、准确、提取率高,适合提取柿果皮的总三萜酸。