Ag enhanced CuS nanoflower catalyst coupling dielectric barrier discharge plasma for disinfection performance and mechanism

In this study,the hydrothermal method was employed to grow submicron CuS on carbon cloth(CC),and the photoreduction method was used to grow Ag nanoparticles on the CuS submicron flowers,thus forming the Ag/CuS/CC catalytic electrode.The application of Ag/CuS/CC electrode-coupled dielectric barrier discharge(DBD)plasma in the disinfection of pathogenic bacteria in water was studied.The Ag/CuS/CC electrode exhibits strong antibacterial activity,and under an external voltage of 30 V,the degradation efficiency of Bacillus subtilis reaches 99.99%within 15 min without regeneration.After five cycles,the inactivation rate of Bacillus subtilis reached 99.99%within 25 min.The practical applicability of the Ag/CuS/CC-coupled DBD system for treating actual wastewater was evaluated,and the changes in biological toxicity were investigated.The results indicate that the prepared Ag/CuS/CC coupled DBD has great potential for safe disinfection of pathogenic bacteria in water through integrated processes.

基于虚幻引擎的智能矿山数字孪生系统云渲染技术

HTML5、WebGL、云渲染等技术为浏览器、移动端、XR等多种终端的可视化渲染提供了重要技术支撑。本文分析比较了其优缺点,并采用虚幻引擎4的云渲染技术,采用某煤矿的倾斜摄影、BIM、巷道、设备、三维地质模型开展了系统设计与测试,分析了云渲染的效率和效果,实现了数字孪生云渲染技术在智能矿山的应用。

数字孪生技术在小型水库管理中的应用初探

针对我国小型水坝存在的安全隐患问题,本文基于数字孪生技术提出并构建了小型水坝数字孪生动态监管云平台,论述了小型水坝数字孪生平台建设思路。首先基于物联传感设备实现雨水情、坝体安全感知,然后通过构建室内外一体化精细三维模型搭建统一时空数据底座,实现视频监控与三维模型的融合,最后基于AI技术实现入侵检测,构建小型水库动态监管云平台。数字孪生技术能够为水库大坝提供全面的实时监测信息,实现实时连接与动态交互。本文初步探讨了数字孪生技术在水库大坝管理中的应用,可为小型水坝状态感知与安全管理提供参考。

Analysis of the Causes of a Low Cloud and Low Visibility Weather at Cangyuan Washan Airport

At 11:00 am on August 5, 2017, Cangyuan Washan Airport experienced low cloud and low visibility weather, accompanied by aircraft turbulence, which affected the normal operation of flights, which was closely related to the meteorological conditions at that time. Using the hourly reanalysis data of the European Centre for Medium-range Weather Forecast (ECMWF) Reanalysis 5 (ERA5), including Geopotential height, temperature, precipitation, wind field, specific humidity, vorticity and other elements, with a spatial resolution of 0.25° × 0.25°, this paper focuses on the horizontal distribution and vertical configuration of various physical quantities before and after the occurrence of low cloud and low visibility weather at the airport. The results indicate that the main influencing system of this low cloud and low visibility weather is the westward tropical depression. Before the occurrence of low cloud and low visibility weather, low-level water vapor converges and is accompanied by precipitation. The temperature decreases with precipitation, the near-surface wind direction changes, and the wind speed decreases.

Geographical classification of Nanfeng mandarin by near infrared spectroscopy coupled with chemometrics methods

Near infrared spectroscopy(NIRS),coupled with principal component analysis and wavelength selection techniques,has been sed to develop a robust and reliable reduced-spectrum classifi-cation model for determining the geographical origins of Nanfeng mandarins.The application of the changeable size moving window principal component analysis(CSMWPCA)provided a notably improved lassification model,with correct classification rates of 92.00%,100.00%,90.00%,100.00%,100.00%,100.00%and 100.00%for Fujian,Guangxi,Hunan,Baishe,Baofeng,Qiawan,Sanxi samples,respectively,as well as,a total dassification rate of 97.52%in the wavelength range from 1007 to 1296 nm.To test and apply the proposed method,the procedure was applied to the analysis of 59 samples in an independent test set.Good identification results(correct rate of 96.61%)were also received.The improvement achieved by the application of CSMWPCA method was particularly remarkable when taking the low complexities of the final model(290 variables)into account.The results of the study showed the great potential of NIRS as a fast,nondestructive and environmentally acceptable method for the rapid and reliable determination for geographical classifcation of Nanfeng mandarins.

一种酿酒酵母和副干酪乳杆菌发酵产物滤液复合物对面部微生态的影响

本研究旨在考察一种经喜马拉雅食品来源酿酒酵母和副干酪乳杆菌发酵而得的滤液复合物(SLFC)对面部细菌微生态和皮肤屏障的调节作用。筛选有皮肤衰老迹象女性30人(30~45岁,平均年龄38岁),对比使用SLFC前(D0)和使用28天后(D28)两组样本,面部细菌物种Alpha多样性显著降低(p<0.05);Beta多样性分组有意义(p<0.05);在ASV(amplicon sequence variants)水平上考察物种组成,结果显示葡萄球菌属丰度显著增加(p<0.05),丙酸杆菌属、棒状杆菌属、不动杆菌属等皮肤常驻菌的相对丰度保持稳定,链球菌属、红球菌属、水栖菌属、黄杆菌属等机会致病菌的丰度下降。对皮肤特征菌检测,结果显示表皮葡萄球菌的丰度显著提高(p<0.05);痤疮丙酸杆菌丰度变化不显著;金黄色葡萄球菌则无检出。D28组消费者反馈肌肤平滑、光泽和保湿状态得到改善,此外肌肤泛红得到缓解。由此可得,发酵产物复合物SLFC能有效调节并稳定面部菌群微生态平衡,巩固皮肤屏障。

基于社交媒体大数据的闽南非物质文化遗产时空扩散及对地理环境的响应

以2010—2020年社交媒体大数据获取闽南非物质文化遗产(全文简称闽南非遗)POI数据,采用空间分析和地理探测器研究了闽南非遗POI时空扩散特征及其对多维地理环境的响应。结果表明:闽南非遗类型结构以传统戏剧、传统音乐、民俗和传统技艺为主,在全国尺度形成了以福建省及台湾地区台北市和高雄市为核心的2条南北带状聚集区;在福建省尺度上,非遗POI为正的空间自相关分布模式,形成了由厦门、漳州、泉州及福州市向内陆辐射分布的特征,10 a间POI数量逐年上升,非遗质心在南安市和厦门市内迂回;交通、沿河、人口密度、坡度、温度、城镇化水平等自然、社会环境共同主导闽南非遗POI时空扩散,文化根植性也是其扩散的重要机制。

Impacts of Sulfur and Microalgae Co-fertilization on Saline-alkaline Soil of Sunflower Field in Hetao Irrigation District

[Objectives]To evaluate the impacts of the elemental sulfur(S 0)and micro-algae(MA)co-fertilization on saline-alkaline soil of sunflower field in the Hetao Irrigation District(HID).[Methods]The greenhouse pot experiment was conducted with four treatments:control(CK),single S 0 fertilization(S),single MA fertilization(A),and S 0 and MA co-fertilization(SA)for comparing the selected soil properties and sunflower plant heights and weights in different treatments.[Results]The results showed that the mean soil organic matter(SOM)under the SA(25.08 g/kg)was significantly higher than that for the CK(20.59 g/kg),S(22.47 g/kg),and A(22.95 g/kg).The mean pH under the SA(7.75)was significantly lower than that for the CK(8.14),S(7.82),and A(7.96).The mean soil exchangeable Na+concentration under the SA was significantly lower than that for the S.The mean soil electrical conductivity(EC)under the SA was 9.76%lower than that for the S.The means of Cl-(1.22 g/kg)and SO 2-4(1.90 g/kg)in soil under the SA were lower than that for the S(1.30,2.06 g/kg)and A(1.31,1.97 g/kg),respectively.For plant height 3 at the late stage of plant growth,the mean plant height 3 under the SA(89.00 cm)was higher than that of the CK(69.60 cm)and A(74.33 cm).The total weights of the fresh sunflower heads,fresh stems,and dry seeds under the SA were higher than that for the CK,S,and A.[Conclusions]In conclusion,the S 0 and MA co-fertilization had positive effects on improving saline-alkaline soils,the soil under the S 0 and MA co-fertilization could be better conditions for promoting sunflower growth than that for the S,Z,and CK,and thereby the S 0 and MA co-fertilization could be a new idea to improve saline-alkaline soil in the cold and arid regions.

Chemical constituents and pharmacological activities of Salvia miltiorrhiza

Salvia miltiorrhiza Bunge(S.miltiorrhiza),a perennial plant of the genus Salvia,is widely used in traditional folklore medicine.Previous chemical research on this plant contains diterpenoid quinones,phenolic acids,polysaccharides and other compounds.The pharmacological investigation of S.miltiorrhiza has shown that it has various pharmacological activities,such as cardiovascular system protection,anti-inflammatory,anti-oxidant,anti-tumor,liver protection,and neuroprotection activities.This research tends to give an overview of the main chemical constituents and pharmacological effects of S.miltiorrhiza,aiming to reveal its potential value and provide reference for its further development.

Study on the pharmacological activities and chemical structures of Viburnum dilatatum

Viburnum dilatatum(jiami in Chinese),belonging to the Caprifollaceae family,is widely distributed in Japan and China.Phytochemical investigations of Viburnum dilatatum(V.dilatatum)have resulted in the isolation of triterpenoids,phenolic glycosides essential oil,norisoprenoids,etc.Research results have shown that the chemical constituents of V.dilatatum possess various pharmacological activities,including antihyperglycemic,antioxidant activity and antiulcer effects.This study reviewed the chemical constituents and pharmacological activities of V.dilatatum to provide practical and useful information for further research and development of this plant.

Effect of neodymium doping on structure,magnetic properties and microwave absorption performance of SrMnO_(3)

A simple composite Sr_(1-x)Nd_(x)MnO_(3)(x=0,0.05,0.1,0.15,0.2) nano powders were successfully prepared by the sol-gel method as a light-weight broadband electromagnetic wave absorber.The effect of Nd^(3+)doping on the structure,microstructure and properties of SrMnO_(3) was investigated.It is found that with the doping of Nd^(3+),the space group of the SrMnO_(3) changes from p63/mmc to pm3m,and the crystalline shape starts to change from hexagonal to cubic crystalline.Scanning electron microscopy(SEM) and Brunauer-Emmett-Teller(BET) tests confirm that the particle sizes of the sample decrease and the specific surface area increases,which are attributed to the inhibition of grain growth after Nd^(3+)is doped.X-ray photoelectron spectroscopy(XPS) shows that after Nd^(3+)doping,the content of oxygen vacancy increases,and Mn^(4+) converts to Mn^(3+).Due to the defects of the materials,the polarization effect is enhanced,thus,the dielectric and magnetic properties of the doped samples are improved.The maximum reflection loss of the Sr_(0.85)Nd_(0.15)MnO_(3) is-33.41 dB at 7.84 GHz for a thickness of 2.4 mm,while Sr_(0.9)Nd_(0.1)MnO_(3) has the best bandwidth performance at 2.32 GHz with a reflection loss below-10dB.

TCM therapy for patients with positive antibody response to SARS-CoV-2

Objective:This study aimed to observe the efficacy and safety of traditional Chinese medicine therapy in patients with positive antibody responses to severe acute respiratory syndrome coronavirus 2.Methods:A retrospective observation was conducted on 25 patients with positive antibody responses but negative nucleic acid testing results who received Anshouxinshen therapy.The changes in symptoms,infective indicators,and safety were recorded.Results:Following treatment,the positive IgM responses of 18 patients became negative within one week,with an average time for antibody to become negative being 2 days.Of the seven patients with positive IgG responses,six became IgG-negative with an average time for antibody to become negative being 6.8 days.All symptoms of anxiety,insomnia,cough,fever,fatigue,and other symptoms improved 100%for all patients.After treatment,the lymphocyte count and lymphocyte ratio of patients significantly increased.No adverse reactions to Anshouxinshen therapy were reported.Conclusion:Anshouxinshen therapy is an effective treatment for patients with positive antibody responses to syndrome coronavirus 2,safely improving their immune functions.Early traditional Chinese medicine intervention can reduce the incidence of coronavirus disease 2019 and improve its cure rate,thereby promoting the prevention and control of coronavirus disease 2019.

公司治理对营运资本持有量动态调整的影响——基于中国A股制造业上市公司数据的实证检验

公司治理是现代企业管理的重要机制，对企业营运资本持有量的动态调整产生显著影响。本文以2009~2014年A股制造业上市公司为样本，首先验证企业存在最优营运资本持有量，然后采用主成分分析法构建公司治理的度量指标，并在此基础上选用固定效应模型实证检验公司治理对营运资本持有量动态调整的影响。研究结果表明，当营运资本持有量达到一个目标值时会使得企业业绩最优，在企业营运资本持有量向目标值调整的过程中，公司治理会显著地影响营运资本持有量的调整速度，公司治理水平越高，营运资本持有量的调整速度越快。

货币政策、会计信息质量与企业非效率投资

本文以2008-2016年度深交所非金融类上市公司为研究对象，以货币政策为切入点，研究会计信息质量对企业非效率投资的影响。研究发现提高会计信息质量能够有效治理企业非效率投资，但货币政策对会计信息质量和企业非效率投资二者之间关系的影响具有非对称性，紧缩的货币政策不仅会增强企业会计信息质量对投资不足的缓解作用，还会减弱会计信息质量对投资过度的抑制作用。

上海城区PM_(2.5)精细化空间分布插值方法研究

PM_(2.5)是我国大中型城市的主要污染物之一,已成为多学科领域的研究热点.基于监测点的监测数据无法直接获取城市内部空气污染的高分辨率空间分布情况,以上海市中心为研究区,引入土地利用回归(LUR)模型模拟PM_(2.5)质量浓度的高分辨率空间分布情况.双变量相关分析表明,与PM_(2.5)质量浓度分布相关性最强的地理变量分别是国控点2 000 m缓冲区内的道路长度、2 500 m缓冲区内的建筑面积、2 500 m缓冲区内的绿地面积、500 m缓冲区内的水体面积以及人口密度.基于以上变量,用多元线性回归分析建立PM_(2.5)质量浓度空间分布的LUR模型.在研究区内建立1 km×1 km格网,用LUR模型模拟各格网交点的PM_(2.5)质量浓度,再通过空间插值分析得到上海市PM_(2.5)质量浓度的空间分布模拟图.结果表明,PM_(2.5)模拟质量浓度存在明显的空间梯度差异,整体呈现西部高东部低的格局,并由人口密集区域向四周递减.人类活动是影响PM_(2.5)质量浓度分布的主要原因,模拟结果与实际情况相符.

多孔介质模型在多翼离心风机结构优化的应用

为了研究多翼离心风机进口处加装整流网对其性能的影响情况,以某家用抽油烟机为研究对象,针对其在运行过程中存在噪声大等问题,利用FLUENT中多孔介质模型进行数值模拟,并制作新的样机模型进行试验验证。研究结果表明,加装整流网虽然会在一定程度上增加流阻,产生压力损失,影响风机p-Q性能,但采用整流网可以改善进口附近回流现象,减小涡旋区域,有效增大流通面积。分析噪声性能试验结果可知,相比于原型机,新样机降噪效果明显,各工况点下平均降噪约0.9B。

制造业战略转型背景下供应链关系对企业战略变化的影响

本文实证研究了供应链关系对我国制造业企业战略变化的影响。研究结果表明,较好的供应链关系能够提高我国制造业企业进行初创性、设计性与管理性战略变化的幅度。进一步地,本文研究了在面对外部环境差异与内部资源差异时供应链关系对战略变化影响的异同,以及供应商关系与客户关系分别对战略变化的影响。研究发现,外部环境差异与内部资源差异均会影响供应链关系与战略变化的相关性,并且客户关系与供应商关系对战略变化的影响也有不同。本文研究结果有助于深入理解企业战略变化的过程,并对我国制造业企业如何通过供应链关系来推动战略变化的实施有一定参考价值。

Association of Helicobacter pylori infection with colorectal polyps and malignancy in China

BACKGROUND Gastric Helicobacter pylori(H.pylori)infection is related to chronic gastritis,gastroduodenal ulcer,and gastric malignancies;whether this infection is related to colorectal polyps and colorectal cancer(CRC),remains debatable.AIM To investigate the relationship between gastric H.pylori infection and the risk of colorectal polyps and CRC.METHODS We retrospectively analyzed 3872 patients with colorectal polyps who underwent colonoscopy and pathological diagnosis.We also analyzed 304 patients with primary CRC.The characteristics of these patients were compared with those of the control group,which included 2362 patients with the normal intestinal mucosa.All subjects completed a 14C-urea breath test,bidirectional gastrointestinal endoscopy,and a biopsy on the same day.Data on the number,size,location,and pathology of the polyps,the location,and pathology of the CRC,the detection of H.pylori,and the incidence of H.pylori-associated atrophic gastritis or intestinal metaplasia were obtained.A logistic regression model was used to analyze the relationship between gastric infection due to H.pylori,and the incidence of colorectal polyps and CRC.RESULTS The prevalence of H.pylori infection was higher in the multiple polyps group than in the solitary polyp group and the control group[95%confidence interval(CI)=1.02-1.31,P=0.03;95%CI:2.12-2.74,P<0.001].The patients with adenomatous polyps had a higher incidence of H.pylori infection than patients with non-adenomatous polyps[59.95%vs 51.75%,adjusted odds ratio(OR)=1.41,95%CI:1.24-1.60,P<0.01].Patients with H.pylori-associated atrophic gastritis or intestinal metaplasia were at high risk of CRC(adjusted OR=3.46,95%CI:2.63-4.55,P<0.01;adjusted OR=4.86,95%CI:3.22-7.34,P<0.01,respectively).The size and location of the polyps,the histopathological characteristics and the location of CRC were not related to H.pylori infection.CONCLUSION Our study demonstrates that the incidence of gastric H.pylori infection and H.pylori-associated atrophic gastritis or intestinal metaplasia elevates the risk of colorectal polyps and CRC.

Individual-tree diameter growth model for Korean pine plantations based on optimized interpolation of meteorological variables

To explore the influence of meteorological variables on the growth of Korean pine(Pinus koraiensis Sieb.et Zucc.) plantations and provide a scientific reference for the production and management of Korean pine,three approaches to interpolate meteorological variables during the growing season(i.e.,May-September) were compared in Heilongjiang Province,China.Optimized meteorological variable interpolation results were then combined with stand and individual tree variables,based on data from 56 sample plots and 2886 sample trees from Korean pine plantations in two regions of the province to develop an individualtree diameter growth model(Model I) and an individualtree diameter growth model with meteorological variables(Model Ⅱ) using a stepwise regression method.Moreover,an individual-tree diameter growth model with regional effects(Model Ⅲ) was developed using dummy variables in the regression,and the significance of introducing these dummy variables was verified with an F-test statistical analysis.The models were validated using an independent data set,and the predictive performance of the three models was assessed via the adjusted coefficient of determination(R_(a)^(2)) and root mean square error(RMSE).The results suggest that the growth increment in tree diameter of Korean pine plantations was significantly correlated with the natural logarithm of initial diameter(ln D),stand basal area(BAS),logarithmic deformation of the stand density index(ln SDI),ratio of basal area of trees larger than the subject tree to their initial diameter at breast height(DBH)(BAL/D),and the maximum growingseason precipitation(Pgmax).The individual-tree diameter growth models of Korean pine plantations developed in this study will provide a good basis for estimating and predicting growth increments of Korean pine forests over larger areas.

Clinical characteristics of sentinel polyps and their correlation with proximal colon cancer: A retrospective observational study

BACKGROUND Colorectal cancer is a common malignant tumor of the digestive tract.The relationship between sentinel polyps(rectal polyps with proximal colon cancer)and proximal colon cancer has received extensive attention in recent years.However,there is still no clear conclusion regarding the relationship.AIM To investigate the clinical characteristics of sentinel polyps and their correlation with proximal colon cancer.METHODS A retrospective analysis of 2587 patients with rectal polyps from January 2006 to December 2017 was performed.According to whether or not proximal colon cancer was diagnosed,the patients were divided into either a sentinel polyp group(192 patients)or a pure rectal polyp group(2395 patients).The endoscopic features,clinicopathological features,therapeutic effects,and short-term prognosis were analyzed and compared between the two groups.RESULTS The mean age of patients in the sentinel polyp group was generally higher than that of the pure rectal polyp group,and the positivity rates of anemia,stool occult blood,and tumor markers of the sentinel polyp group were also significantly higher than those in the rectal polyp group(χ^2=90.56,P<0.01;χ^2=70.30,P<0.01;χ^2=92.80,P<0.01).The majority of the patients in the sentinel polyp group had multiple polyps,large polyps,adenomatous polyps,or sessile polyps(χ^2=195.96,P<0.01;χ^2=460.46,P<0.01;χ^2=94.69,P<0.01;χ^2=48.01,P<0.01).Most of the proximal colon cancers were Duke’s A and B stages in the sentinel polyp group.In the pure rectal polyp group,2203 patients underwent endoscopic treatment,and all of the patients were cured and discharged.In the sentinel polyp group,65 patients underwent radical operation,and 61 patients received endoscopic submucosal dissection or endoscopic mucosal resection.Additionally,21 patients were lost to follow-up after 6-12 mo,and the loss rate was 10.94%.A total of 63.16%of patients experienced remission without tumor recurrence or metastasis,33.33%of patients experienced tumors regression or improved symptoms,and the other 3.51%of the patients died.CONCLUSION If there are multiple,sessile,and adenomatous rectal polyps with a maximum diameter>1 cm,the possibility of the carcinogenesis of the polyps or of the proximal colon should be monitored closely.These patients should be followed in the short-term and should undergo a whole-colon examination.