Use of a combined model in the investigation of the hydrodynamic structure of the flow of a liquid on a bubble tray

The article presents the questions of reviewing models and mechanisms of public administration in the procurement of goods, works and services in the field of construction. A comparative analysis of the types of public procurement mechanisms in construction, based on a set of features, has shown the superiority of a centralized type of mechanism that facilitates the introduction of efficient and flexible procurement methods, for example, the conclusion of framework agreements. The author’s vision of the mechanism of state building purchases, in the form of a conceptual model and system differences, is proposed. It is determined that a decentralized model of public procurement management involves the independent implementation by purchasers of procurement, that is, allows each customer to procure goods, works and services in the field of construction. The centralized model of public administration is characterized by the implementation of public procurement in order to provide the general needs of a single body on public procurement, that is, customers commission the implementation of public procurement on their behalf, a centralized body. According to the combined model of management, public procurement in the construction industry takes place under contracts implemented under the centralized model, and the direct ordering and receipt of goods, works, or services takes place according to the rules of a decentralized model. It is noted that according to the system-wide understanding of the mechanism of public administration in the procurement of goods, works and services in the field of construction, it represents a set of specialized management technologies (methods, techniques and tools) that ensure the organization of the process of public procurement of construction products by authorized agents. The direction of this process is determined by the need to implement the principles of vali- dity and innovation, fair choice of the best bidding, prevention of corruption and ensuring the high efficiency of the implementation of public public procurement.

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HYDRODYNAMIC STRUCTURE IN A LARGE DAM RESERVOIR DURING EARLY AUTUMN

Journal of Japan Society of Civil Engineers Ser B1 (Hydraulic Engineering) ◽

10.2208/jscejhe.74.5_i_481 ◽

2018 ◽

Vol 74 (5) ◽

pp. I_481-I_486

Author(s):

Makoto UMEDA ◽

Yuta NAITO ◽

Bunyu KOBORI ◽

Tetsuya SHINTANI ◽

Kazushi OMOE ◽

...

Keyword(s):

Dam Reservoir ◽

Early Autumn ◽

Hydrodynamic Structure ◽

Large Dam

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A Combined Model for the X‐Ray to Gamma‐Ray Emission of Cygnus X‐1

The Astrophysical Journal ◽

10.1086/305889 ◽

1998 ◽

Vol 502 (1) ◽

pp. 428-436 ◽

Cited By ~ 3

Author(s):

Igor V. Moskalenko ◽

Werner Collmar ◽

Volker Schonfelder

Keyword(s):

Gamma Ray ◽

Combined Model ◽

X Ray ◽

Gamma Ray Emission

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Load forecasting of refrigerated display cabinet based on CEEMD–IPSO–LSTM combined model

Open Physics ◽

10.1515/phys-2021-0043 ◽

2021 ◽

Vol 19 (1) ◽

pp. 360-374

Author(s):

Yuan Pei ◽

Lei Zhenglin ◽

Zeng Qinghui ◽

Wu Yixiao ◽

Lu Yanli ◽

...

Keyword(s):

Time Series ◽

Deep Learning ◽

Time Series Data ◽

Load Forecasting ◽

Series Data ◽

Forecasting Model ◽

Combined Model ◽

Forecasting Accuracy ◽

Forecasting Method ◽

Consumption Reduction

Abstract The load of the showcase is a nonlinear and unstable time series data, and the traditional forecasting method is not applicable. Deep learning algorithms are introduced to predict the load of the showcase. Based on the CEEMD–IPSO–LSTM combination algorithm, this paper builds a refrigerated display cabinet load forecasting model. Compared with the forecast results of other models, it finally proves that the CEEMD–IPSO–LSTM model has the highest load forecasting accuracy, and the model’s determination coefficient is 0.9105, which is obviously excellent. Compared with other models, the model constructed in this paper can predict the load of showcases, which can provide a reference for energy saving and consumption reduction of display cabinet.

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The Effects of Employment on Depression and Life Satisfaction Among Old-Aged Using the DD Method Combined With PSM

Innovation in Aging ◽

10.1093/geroni/igaa057.1315 ◽

2020 ◽

Vol 4 (Supplement_1) ◽

pp. 408-408

Author(s):

Si Young Song ◽

Hey Jung Jun ◽

Sun Ah Lee

Keyword(s):

Life Satisfaction ◽

Propensity Score ◽

Propensity Score Matching ◽

Multiple Regression ◽

Propensity Scores ◽

Panel Study ◽

Double Difference ◽

Combined Model ◽

Comparative Group ◽

Experimental Group

Abstract The purpose of this study is to explore the effect of employment on depression and life satisfaction among old-aged. Using 12th (2017) wave and 13th (2018) wave of Korean Welfare Panel Study (KoWePS), three stages of analyses were conducted. First, through propensity score matching (PSM) method, sample with similar propensity scores was matched between the group that did not work in 12th wave but worked in 13th wave (experimental group, N=180), and the group that did not work in 12th and 13th wave (comparative group, N=180). Second, the matched sample was used to conduct multiple regression analysis with the group dummy variable (experimental group, comparative group) as an independent variable, and depression and life satisfaction as the dependent variables. Third, combined model of propensity score matching (PSM) and double difference (DD) method was conducted to more appropriately derive the net effect of employment. The results of multiple regression after propensity matching showed that employment had a positive effect on reducing depression (B= -1.70, p< .01) and increasing life satisfaction (B= .12, p< .01) in old-aged. Furthermore, in combined model of PSM and DD, life satisfaction was improved when employed compared to non-employed (B= .15, p< .05). The results of this study are meaningful in that the meaning of employment in old-aged is more clearly derived by solving selection bias and endogenous problems. Also, this study may provide reference for establishing welfare policies related to employment among old-aged.

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Kombucha Tea as a Reservoir of Cellulose Producing Bacteria: Assessing Diversity among Komagataeibacter Isolates

Applied Sciences ◽

10.3390/app11041595 ◽

2021 ◽

Vol 11 (4) ◽

pp. 1595

Author(s):

Salvatore La China ◽

Luciana De Vero ◽

Kavitha Anguluri ◽

Marcello Brugnoli ◽

Dhouha Mamlouk ◽

...

Keyword(s):

Intraspecific Diversity ◽

Water Retention Capacity ◽

Combined Model ◽

Discrimination Power ◽

Retention Capacity ◽

High Mechanical Strength ◽

Kombucha Tea ◽

Typing Methods ◽

Fermented Beverage ◽

Tea Production

Bacterial cellulose (BC) is receiving a great deal of attention due to its unique properties such as high purity, water retention capacity, high mechanical strength, and biocompatibility. However, the production of BC has been limited because of the associated high costs and low productivity. In light of this, the isolation of new BC producing bacteria and the selection of highly productive strains has become a prominent issue. Kombucha tea is a fermented beverage in which the bacteria fraction of the microbial community is composed mostly of strains belonging to the genus Komagataeibacter. In this study, Kombucha tea production trials were performed starting from a previous batch, and bacterial isolation was conducted along cultivation time. From the whole microbial pool, 46 isolates were tested for their ability to produce BC. The obtained BC yield ranged from 0.59 g/L, for the isolate K2G36, to 23 g/L for K2G30—which used as the reference strain. The genetic intraspecific diversity of the 46 isolates was investigated using two repetitive-sequence-based PCR typing methods: the enterobacterial repetitive intergenic consensus (ERIC) elements and the (GTG)5 sequences, respectively. The results obtained using the two different approaches revealed the suitability of the fingerprint techniques, showing a discrimination power, calculated as the D index, of 0.94 for (GTG)5 rep-PCR and 0.95 for ERIC rep-PCR. In order to improve the sensitivity of the applied method, a combined model for the two genotyping experiments was performed, allowing for the ability to discriminate among strains.

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