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食品安全国家抽样检查的重要性与实施策略

食品安全导刊 2024年第7期 4-6页

作者：张国发张苗保定市食品药品检验所河北保定071000

近年来,我国食品安全形势总体稳定,但仍存在一些突出问题。为了保障人们的身体健康和生命安全,我国采取了一系列措施,其中最重要的就是国家抽样检查。基于此,本文探讨食品安全国家抽样检查的重要性,并提出相应的实施策略。

关键词：食品安全国家抽样检查重要性

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大庆市蝶类多样性及其影响因素

草业科学 2024年第4期41卷 845-855页

作者：袁改霞张大川张国发殷亚杰张奕婷李玥徐太海大庆师范学院生物工程学院黑龙江大庆163712 温州市洞头区气象局温州市台风监测预报技术重点实验室浙江温州325700

为明确大庆市蝶类多样性及其影响因素,2016-2019年利用样线法对大庆市不同生境类型中的蝴蝶开展了调查研究。共观测到蝴蝶5780只,隶属6科29属36种。灰蝶科的个体数最多,蛱蝶科的物种数最多,是当地的优势类群;凤蝶科仅1种,是当地的稀有... 详细信息

为明确大庆市蝶类多样性及其影响因素,2016-2019年利用样线法对大庆市不同生境类型中的蝴蝶开展了调查研究。共观测到蝴蝶5780只,隶属6科29属36种。灰蝶科的个体数最多,蛱蝶科的物种数最多,是当地的优势类群;凤蝶科仅1种,是当地的稀有类群。优势种7个,常见种5个,少见种4个,稀有种20个。不同的生境蝶类群落种类与数量存在一定的差异,人为干扰小、植物群落结构最为复杂的新华草原蝶类的属数和种数最多,而人为干扰较强、植物群落单一的大庆龙凤湿地自然保护区最少;新华草原的蝶类多样性指数最高,大庆龙凤湿地自然保护区最低;新华草原的丰富度指数最高,乘风湖岸边最低。蝶类物种数、个体数、多样性指数及丰富度指数月度变化基本一致,且与月均温显著正相关(P<0.05),而与月降水量无相关性。综上,蝶类多样性与植被类型、月均温有明显的相关性。而相同气象条件下,植被类型是影响蝶类分布的重要因素。为了保护与丰富蝶类资源,建议植被单一的区域,进行适度的植被异质化建设。

关键词：蝴蝶多样性指数人为干扰气象因子月动态丰富度指数数量特征

Accurate Reliability Analysis Methods for Approximate Computing Circuits

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Tsinghua Science and Technology 2022年第4期27卷 729-740页

作者： Zhen Wang guofa zhang Jing Ye Jianhui Jiang Fengyong Li Yong Wang School of the Computer Science and Technology Shanghai University of Electric PowerShanghai 200090China Institute of Computing Technology Chinese Academy of SciencesBeijing 100190China School of Software Engineering Tongji UniversityShanghai 200092China

In recent years,Approximate Computing Circuits(ACCs)have been widely used in applications with intrinsic tolerance to *** the increased availability of approximate computing circuit approaches,reliability analysis methods for assessing their fault vulnerability have become highly *** this study,two accurate reliability evaluation methods for approximate computing circuits are *** reliability of approximate computing circuits is calculated on the basis of the iterative Probabilistic Transfer Matrix(PTM)*** the calculation,the correlation coefficients are derived and combined to deal with the correlation problem caused by fanout *** accuracy and scalability of the two methods are verified using three sets of approximate computing circuit instances and more circuits in Evo Approx8 b,which is an approximate computing circuit open source *** results show that relative to the Monte Carlo simulation,the two methods achieve average error rates of 0.46%and 1.29%and time overheads of 0.002%and 0.1%.Different from the existing approaches to reliability estimation for approximate computing circuits based on the original PTM model,the proposed methods reduce the space overheads by nearly 50%and achieve time overheads of 1.78%and 2.19%.

关键词： Approximate Computing Circuit(ACC) correlation coefficient iterative Probabilistic Transfer Matrix(PTM) reliability

Effects of rice or wheat residue retention on the quality of milled japonica rice in a rice–wheat rotation system in China

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The Crop Journal 2015年第1期3卷 67-73页

作者： Pengfu Hou Yanfeng Ding guofa zhang Quan Li Shaohua Wang She Tang Zhenghui Liu Chengqiang Ding Ganghua Li College of Agronomy Nanjing Agricultural University/Key Laboratory of Crop Physiology Ecology and Production ManagementMinistry of Agriculture Daqing Normal University

In rice–wheat rotation systems, crop straw is usually retained in the field at land preparation in every, or every other, season. We conducted a 3-year-6-season experiment in the middle–lower Yangtze River Valley to compare the grain qualities of rice under straw retained after single or double seasons per year. Four treatments were designed as: both wheat and rice straw retained(WR), only rice straw retained(R), only wheat straw retained(W), and no straw retained(CK). The varieties were Yangmai 16 wheat and Wuyunjing 23 japonica rice. The results showed contrasting effects of W and R on rice quality. Amylopectin content, peak viscosity, cool viscosity, and breakdown viscosity of rice grain were significantly increased in W compared to the CK, whereas gelatinization temperature,setback viscosity, and protein content significantly decreased. In addition, the effect of WR on rice grain quality was similar to that of W, although soil fertility was enhanced in WR due to straw being retained in two cycles. The differences in protein and starch contents among the treatments might result from soil nitrogen supply. These results indicate that wheat straw retained in the field is more important for high rice quality than rice straw return, and straw from both seasons is recommended for positive effects on soil fertility.

关键词： Japonica rice Crop straw Grain quality Paddy–upland rotation

Complementary multicolor electrochromic devices with excellent stability based on porous tin oxide nanosheet scaffold

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Nano Research 2024年第4期17卷 3035-3042页

作者： Chenchen Bian Jinhui Wang Huanhuan Liu Yin Yan Ping zhang Weilong Yang Sensen Jia Xiaodan Guo guofa Cai Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Center for High-Efficiency Display and Lighting TechnologySchool of Materials and Engineeringand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China

Electrochromic devices(ECDs)have been extensively investigated as promising candidates in broad cutting-edge applications,such as smart windows,electronic labels,adaptive camouflage,***,they have suffered from either inadequate color variations or poor cycling stability for a long ***,we developed a general strategy to boost the cyclic stability and enrich the color variations of ECDs by scrupulous design of the composition and nanostructure of electrodes,in which porous tin oxide(SnO_(2))nanosheets serve as the scaffold and typical metal oxides or conducting polymers as the active electrochromic *** electrochromic composite materials,including polyaniline(PANI)@SnO_(2),V2O5@SnO_(2),and WO_(3)@SnO_(2) heterostructured nanoarrays were prepared by the facile wet-chemical *** composite electrodes exhibit remarkable electrochromic performances,e.g.,superior cycling stability(more than 2000 cycles),rich color variations(more than 5 colors for PANI@SnO_(2)),and enlarged optical *** excellent performances account for the heterogenous porous nanoarrays,which not only facilitate the intercalation/extraction of ions but also relieve the stress generated during the electrochemical *** addition,diverse prototypes of complementary multicolor ECD with excellent cycling stability(over thousands of cycles)and rich color variations(8 colors)were realized for the first *** believe that our work put forward a general strategy for developing high-quality multicolor complementary electrochromic devices.

关键词： electrochromism tin oxide metal oxide cycling stability multicolor complementary device

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激光熔覆技术在高锰钢辙叉生产上的应用

热加工工艺 2008年第11期37卷 81-82,87页

作者：张国法中铁山桥集团有限公司河北秦皇岛066205

为提高高锰钢辙叉运营初期的表面硬度和耐磨性,采用在其有害空间附近的心轨和翼轨表面预置纳米碳化物陶瓷复合粉末涂层材料,然后对其进行激光熔覆处理。在其基体表面形成厚度约为0.3mm的超细化、高强韧性、高耐磨的熔覆层。使高锰钢辙... 详细信息

为提高高锰钢辙叉运营初期的表面硬度和耐磨性,采用在其有害空间附近的心轨和翼轨表面预置纳米碳化物陶瓷复合粉末涂层材料,然后对其进行激光熔覆处理。在其基体表面形成厚度约为0.3mm的超细化、高强韧性、高耐磨的熔覆层。使高锰钢辙叉在上道运营初期的磨耗量大副降低,降低了工务人员对其维护保养的劳动强度,使高锰钢辙叉的通过量大幅提高。

关键词：高锰钢辙叉激光熔覆硬度耐磨性

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施钾对寒地水稻养分吸收与分配的影响

作物杂志 2010年第4期 33-35页

作者：张国发大庆师范学院生命科学学院黑龙江大庆163712

为提高寒地水稻养分利用效率,指导合理施肥提供参考。以粳稻品种空育131为材料,研究不同钾肥用量下水稻氮、磷、钾元素吸收和分配的规律。结果表明,施钾后稻谷和稻草中氮、磷相对含量下降,钾元素相对含量升高,氮、磷、钾绝对含量均增加... 详细信息

为提高寒地水稻养分利用效率,指导合理施肥提供参考。以粳稻品种空育131为材料,研究不同钾肥用量下水稻氮、磷、钾元素吸收和分配的规律。结果表明,施钾后稻谷和稻草中氮、磷相对含量下降,钾元素相对含量升高,氮、磷、钾绝对含量均增加;稻谷中氮、钾养分占全株比重变小,而磷的比重增大。施钾有利于促进水稻对氮肥和磷肥的吸收利用,本试验条件下以全生育期90.0kg/hm2K2O的施用量较佳。

关键词：钾肥养分吸收养分分配寒地水稻合理施肥

How can we establish animal models of HIV-associated lymphoma?

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Animal Models and Experimental Medicine 2024年第4期7卷 484-496页

作者： Qing Xiao Liuyue Zhai Xiaomei zhang Yi Liu Jun Li Xiaoqing Xie guofa Xu Sanxiu He Huihui Fu Yifeng Tang Fujie zhang Yao Liu Chongqing Key Laboratory of Translational Research for Cancer Metastasis and Individualized Treatment Department of Hematology-OncologyChongqing University Cancer HospitalChongqingChina Beijing Ditan Hospital Capital Medical UniversityBeijingChina

Human immunodeficiency virus(HIV)infection is strongly associated with a height-ened incidence of *** mirror the natural course of human HIV infection,animal models have been *** models serve as valuable tools to inves-tigate disease pathobiology,assess antiretroviral and immunomodulatory drugs,ex-plore viral reservoirs,and develop eradication ***,there are currently no validated in vivo models of HIV-associated lymphoma(HAL),hampering progress in this crucial domain,and scant attention has been given to developing animal models dedicated to studying HAL,despite their pivotal role in advancing *** re-view provides a comprehensive overview of the existing animal models of HAL,which may enhance our understanding of the underlying pathogenesis and approaches for malignancies linked to HIV infection.

关键词： animal model HIV-associated lymphoma(HAL) human immunodeficiency virus(HIV) immunodeficient mice primate model

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位移补偿计算法在结构索力调整中的应用

建筑结构学报 2008年第2期29卷 39-42页

作者：张国发董石麟卓新浙江大学土木工程学系浙江杭州310027

预应力结构在使用过程中由于索松弛等原因导致结构处于误差状态,影响结构的正常使用。本文提出的位移补偿计算法可对结构的误差状态进行调整计算,对于结构存在力误差及几何误差两类误差状态,计算得到索张力调整控制值,实际施工中依照此... 详细信息

预应力结构在使用过程中由于索松弛等原因导致结构处于误差状态,影响结构的正常使用。本文提出的位移补偿计算法可对结构的误差状态进行调整计算,对于结构存在力误差及几何误差两类误差状态,计算得到索张力调整控制值,实际施工中依照此值对索进行分批张拉即可完成结构索力的施工调整。分析结果表明,采用本计算方法,可使处于力误差状态的结构调整到设计状态,可使处于较小几何误差状态的结构调整后结构构件内力和节点位置满足施工精度要求。

关键词：预应力结构位移补偿计算法误差状态