5种珍禽腿肉营养品质及风味评价

目的 探究不同种类珍禽腿肉的品质差异,并评价其风味。方法 选取了5种珍稀禽类(绿头鸭、雉鸡、鹧鸪、鹌鹑、鸸鹋),比较分析了其腿肉的营养成分、pH、蒸煮损失率、色泽及质构特性的差异,并通过氨基酸自动分析仪和顶空固相微萃取-气相色谱-质谱法对其游离氨基酸和挥发性风味物质进行评价。结果 5种珍禽腿肉中的水分、蛋白质、脂肪含量部分存在显著差异(P<0.05)。从肉品质上来说,鹌鹑腿肉的蒸煮损失率最低为8.77%,且其硬度、胶粘性、咀嚼性较小,肉的保水性好且肉质较嫩。5种珍禽腿肉中谷氨酸和丙氨酸的味道强度值(taste active value, TAV)较高。鹧鸪腿肉的鲜味氨基酸占比(29.78%)最高,鸸鹋腿肉的甜味氨基酸占比(57.70%)最高。5种珍禽腿肉中挥发性风味物质均以醛类和烷烯烃类为主,绿头鸭腿肉的醛类物质相对含量最高,为64.39%,雉鸡腿肉的烷烯烃类物质相对含量最高为40.08%。结论 5种珍禽腿肉的品质、风味各有优劣,可以针对其品质选择合适的加工方式和加工用途。     

松针精油的提取及开发利用的研究进展

松针是一种长年翠绿, 生长速度快, 持续的可再生资源, 已受到研究者的广泛关注。松针精油是松针的主要活性成分之一, 松针精油中含有单萜烯类、倍半萜烯类和含氧萜烯类等物质, 因此具有抗氧化、抗菌、抗病毒、抗肿瘤、降血压和消炎止痛的功能, 这些特性使得松针精油可以应用在医疗保健、蔬果保鲜、化工产品和害虫防治等方面, 松针精油的提取能够促进可再生资源的利用率。本文主要是介绍了松针精油的几种提取方法: 有机溶剂提取法、水蒸气蒸馏法、水酶法和超临界CO2萃取法。本研究为深入研究松针精油提供了一定参考。     

Tumor Necrosis Factor-Alpha Exacerbates Viral Entry in SARS-CoV2-Infected iPSC-Derived Cardiomyocytes

The coronavirus disease 2019 (COVID-19) pandemic with high infectivity and mortality has caused severe social and economic impacts worldwide. Growing reports of COVID-19 patients with multi-organ damage indicated that severe acute respiratory syndrome coronavirus 2 (SARS-CoV2) may also disturb the cardiovascular system. Herein, we used human induced pluripotent stem cell (iPSC)-derived cardiomyocytes (iCMs) as the in vitro platform to examine the consequence of SARS-CoV2 infection on iCMs. Differentiated iCMs expressed the primary SARS-CoV2 receptor angiotensin-converting enzyme-II (ACE2) and the transmembrane protease serine type 2 (TMPRSS2) receptor suggesting the susceptibility of iCMs to SARS-CoV2. Following the infection of iCMs with SARS-CoV2, the viral nucleocapsid (N) protein was detected in the host cells, demonstrating the successful infection. Bioinformatics analysis revealed that the SARS-CoV2 infection upregulates several inflammation-related genes, including the proinflammatory cytokine tumor necrosis factor-α (TNF-α). The pretreatment of iCMs with TNF-α for 24 h, significantly increased the expression of ACE2 and TMPRSS2, SASR-CoV2 entry receptors. The TNF-α pretreatment enhanced the entry of GFP-expressing SARS-CoV2 pseudovirus into iCMs, and the neutralization of TNF-α ameliorated the TNF-α-enhanced viral entry. Collectively, SARS-CoV2 elevated TNF-α expression, which in turn enhanced the SARS-CoV2 viral entry. Our findings suggest that, TNF-α may participate in the cytokine storm and aggravate the myocardial damage in COVID-19 patients.     

Live parametric design modifications in CAD-linked virtual environment

This paper presents a solution to support parametric design modification in a virtual reality (VR) environment. It builds upon a novel computer-aided design (CAD) and VR integration framework, namely, CAD-linked virtual reality environment. With this framework, semantic information in CAD models, such as constraints, design features, and parametric settings can be automatically extracted during the creation of VR environment and be integrated into the virtual assembly (VA) models. Moreover, the persistent naming mechanism originating from feature-based modeling technology is introduced into the CAD–VR integration, based on which a persistent linkage between VA models and their CAD counterparts can be established. Users are able to visualize design features and to access the associated parametric info in VR environment and also to change the parametric settings online whenever necessary. The modified parametric settings are then sent back to the linked CAD models so that parts can be re-evaluated. The modified CAD part can then be reloaded into the VA model under an automated mechanism. Such communications between CAD and VR applications are supported in a live mode utilizing the COM interfaces provided by CAD server. With this solution, a quick return loop from VR to CAD is achieved. Therefore, it provides the possibility to support quick design change review and “what-if” evaluations for applications such as collaborative system design and immersive project review in VR. This constitutes the major contribution of the work to product development process.     

改性钻井液的屏蔽暂堵保护油气层技术研究

分析苏皖油田金湖－来安凹陷地层,一些井在实施改性钻井液的屏蔽暂堵保护油气层的不科学、不合理的基础上,有针对性地指出在设计和施工中认识观点的９个误区。基于该区域油气储层岩石孔喉特征,结合该技术原理和技术要点,提出了技术准备,技术设计和实施要点。     

Conceptual procedure for ranking fuzzy numbers based on adaptive two-dimensions dominance

Many methods for ranking of fuzzy numbers have been proposed. However, these methods just can apply to rank some types of fuzzy numbers (i.e. normal, non-normal, positive, and negative fuzzy numbers), and many ranking cases can just rank by their graphs intuitively. So, it is important to use proper methods in the right condition. In this paper, a conceptual procedure is proposed to describe how to use intuitive ranking and some technical ranking methods properly. We also introduce a new ranking fuzzy numbers approach that can adjust experts confidence and optimistic index of decision maker using two parameters ( and ) to handle the problems and find the best solutions. After illustrate many numerical examples following our conceptual procedure the ranking results are validity.     

信息物理融合系统

信息物理融合系统 (Cyber-physical system, CPS)是计算、通信和物理过程高度集成的系统,通过在物理设备中嵌入感知、通信和计算能力,实 现对外部环境的分布式感知、可靠数据传输、智能信息处理,并通过反馈机制实现对物理过程的实时控制. 分析了CPS的基本概念和特征,对CPS的体系架构、中间件系统、实时性、安全和隐私等关键技术的现有研究 成果进行综述,并提出了相应的研究思路;然后介绍了一些现有的CPS原型系统和实例,体现出CPS的优越性; 最后对CPS和传感器网络(Wireless sensor network, WSN)、物联网(The internet of things, IOT)、网络控制系统(Networked control systems, NCSs)进行了对比分析,总结了CPS现有研究中存在的问题,并展望了CPS的发展方向.     

In-situ fabrication and performance optimization of CIGS thin film deposited by ion-beam sputtering without post-selenization

Cu(In, Ga)Se₂ thin films were fabricated by an in situ fabrication process of ion beam sputtering deposition without post-selenization. X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy and four-point probe technique were used to study the microstructures, surface morphology, composition and electrical properties, respectively. The results show that the films grown above 400 °C are of chalcopyrite structure and Cu (In_0.7Ga_0.3) Se₂ thin film was obtained at annealing temperature of 550 °C. With the increase in annealing temperature, the resistivity of the films decreases while the component is nearly steady. The degree of crystallization of the thin films increased at first with increasing of the annealing time and then decreased with the annealing time increasing further. It was demonstrated that the structural and electrical properties of the films improved significantly with adding selenium amount by sputtering selenium.     

基于构件的MIS开发模型研究及应用

为了适应企业信息化的快速实现和实施的需求,研究构件技术在企业信息系统的生命周期内的应用。探讨基于J2EE的管理信息系统的开发模型,设计一个基于构件的信息系统层次架构,分析了构件的提取和重构的实现。最后给出灯饰行业管理信息系统应用的实例。     

4-甲基哌嗪-1-二硫代甲酸-(3-氰基-3, 3-二苯基)丙酯盐酸盐在小鼠的抗肿瘤作用

目的: 观察4-甲基哌嗪-1-二硫代甲酸-(3-氰基-3, 3-二苯基) 丙酯盐酸盐(Hyd) 对小鼠移植性肿瘤的抑制作用, 以确定该化合物的应用前景。方法: 采用小鼠肉瘤180 和肝癌22 及人胃癌异种移植裸鼠肿瘤模型, 观察Hyd 对小鼠移植性肿瘤生长的影响。结果: 通过口服灌胃给药, 不同浓度Hyd 对小鼠移植性肉瘤S180抑制率可达到46.4 %~ 59.6 %(P<0.01 ~ 0.001);对小鼠移植性肝癌H22抑制率可达到39.3 %~ 51.6 %(P<0.05 ~ 0.001);对裸鼠人胃癌异种移植瘤的抑制率可达到18.1 %~ 59.0 %。结论: Hyd 对小鼠移植性肝癌H22 和小鼠移植性肉瘤S180有明显抑制作用, 对人胃癌裸小鼠异种移植性肿瘤也有明显抑制作用。