Research on Heat Dissipation of Multi-Chip LED Filament Package

By studying the substrate material, structure, chip distribution, and array form of the multi-chip light-emitting diode (LED) package, the heat-dissipation capacity of the LED package is improved. Finite element analysis and steady-state thermal analysis are used to simulate and analyze LED packages with different materials and structures. Using the theory of LED illuminance and uniformity, the illuminance of some structures is computed. The results show that the change of substrate material and structure can greatly impact heat dissipation, while changing array forms has little effect on heat dissipation. By improving the spatial distribution of the chip, the temperature superposition problem of the substrate is solved, and the illuminance and uniformity are improved while dissipating heat. The LED filaments of the combined, equidistant, chip-distribution mode have improved heat dissipation. The S-type equal difference has the highest illumination and high illumination uniformity.

Comparative Study of Trend of Suicidal Cases in the Lockdown Period during Severe Phase of First Wave of COVID-19 with Those in Second Wave in Patna among Dead Bodies Brought for Autopsy at Nalanda Medical College, Patna - A Retrospective Study

Introduction: There is hardly a person in the world who is not affected by the fearsome covid19 pandemic either physically, psychologically and socio-economically. It has caused extreme mental stress to not only those infected but also those who had to remain indoors for prolonged period due to lockdown. The second wave in 2021 was deadlier with many casualties though there was no pan INDIA lockdown this time. Aims and Objectives: 1) To study and compare all confirmed suicidal deaths in the first lockdown period upto its severe period (Upto June 2020) with suicidal cases during the second phase of COVID-19, from March to June 2021 approximately. 2) Demographic analysis of suicidal cases with determinants like incidence, sex, & age wise distribution, mode of suicide, any specific causes etc, will be studied & evaluated for any perceptible change between the severe phases of first & second waves Materials and Methods: It is retrospective ,record review analytical and comparative study based on postmortem examination reports of all cases conducted by all doctors of department of FMT, Nalanda Medical College, Patna who did autopsy during both periods of study together with study of all police inquests, requisitions(challans), sent by the police investigating officers of concerned cases. Study period- a) 25th march 2020 to June 2020 (lockdown phase). b) March 2021 to June 2021 Results: Total number of suicides was more in Lockdown period of the First wave (10.88%) than in the in the 2nd phase in 2021(9.87%). In the First phase the cases of hanging were 75% & due to poisoning 25%. But in the 2nd phase hanging accounted for the 62.5%, poisoning 31.25% & Drowning 6.25%. Conclusions: Lockdown had more impact on the mental health of a person in Covid than the actual severity of the disease as the number of suicides decreased in the 2nd phase though it was more severe. Financial concerns & perils of confined life added to the fear of the unknown disease in lockdown & in the second phase people were more prepared mentally & financially to combat the disease. Keywords: covid, lockdown, suicide, hanging, autopsy.

The Influence of Trust on Crowd Logistics Enterprise’s Operational Performance: A SEM-PLS Model

With the development of information communication and satellite positioning, crowd logistics has gradually emerged as a popular urban distribution mode for logistics enterprises. Trust and synergy between the crowd workers and the crowd logistics enterprises have become key issues in urban logistics development. Based on commitment-trust theory and logistics synergy, this paper developed a theoretical model exploring ability trust, goodwill trust, logistics synergy, and crowd logistics operational performance. We used SmartPLS software to analyze the questionnaire survey from 50 senior managers in crowd logistics enterprises. The results show that ability trust has a significant positive impact on logistics synergy and operational performance. Logistics synergy was also found to increase the operational performance of crowd logistics enterprises and plays a mediating role in the impact of ability trust and goodwill trust on operational performance. We recommend that logistics enterprises evaluate their crowd workers’ service abilities, promote trust relationships with them, strengthen the construction of crowd logistics mechanisms, and invest in crowd worker training and development.

Study of Comparison of Suicidal Cases in the Lockdown Period During First Wave of COVID-19 with that of Suicidal Cases in the Period before it among Dead Bodies Brought for Autopsy at Nalanda Medical College, Patna - A Record Review

Introduction: The COVID-19 pandemic has affected the entire world, physically, psychologically and socio-economically. It has caused extreme mental stress to not only those infected but also those who had to remain indoors for prolonged period due to lockdown. Aims and Objectives: 1. To study and compare all confirmed suicidal deaths in the first lockdown period upto its peak period (September 2020) with suicidal cases during the previous six months from October 2019 to 24th march 2020. 2. Demographic analysis of suicidal cases with determinants like incidence, sex, & age wise distribution, mode of suicide, any specific causes etc, will be studied & evaluated for any perceptible change from earlier prelockdwn suicidal deaths Materials and Methods: It is retrospective, record review analytical and comparative study based on postmortem examination reports of all cases conducted by all doctors of department of FMT, Nalanda Medical College, Patna who did autopsy during both periods (pre lockdown & post lockdown/unlock) together with study of all police inquests, requisitions (challans), sent by the police investigating officers of concerned cases. Study period- a) 25th march 2020 to September 2020 (lockdown phase). b) October 2019 to 24th march 2020 (Prelockdown phase). Results: Total number of suicides increase from 6.61%in pre-covid period to 8.56% in lockdown period. In the prelockdown phase the cases of hanging were 66.66% but due to poisoning 33.34%. But in the lockdown phase hanging accounted for the 95.45% and poisoning just 4.55%. Conclusions: Lockdown must be needed based, preplanned and financial support to the needy together with behavioural counseling should be undertaken in letter and spirit. There is an urgency to realize the severity of this suicidal tendency.

Cost Analysis of Current Distribution and Redesigned Distribution Systems for Vaccines in Rwanda

Background Immunization supply chain management is among the components of immunization program, making vaccines delivery possible to reach every child. Nevertheless, it has been found to be static with rapid changes linked to the introduction of new vaccines. The success of Rwanda immunization program with coverage of 94.3% was attributed to human resource and capital investment from both the Ministry of Health and its development partners. However, the current distribution system design does not contribute to self-financing of the program in the long-run considering the distribution mode and frequency applied. The cost analysis study has never been done before and is expected to address the issue of long-term sustainability of the program as it will inform the system re-design activities. Objective Assessing how much the program would save if the system is re-designed by changing distribution mode and frequency from the Central Vaccine Store to District Vaccine Stores. Methods Administrative and financial records were reviewed to determine the cost of the current vaccine distribution system to be compared to estimated cost of a proposed distribution system with reduced frequencies between Central Vaccine Store and District Vaccine Stores. Results By comparing the costs of the two systems, applying the proposed distribution model with less distribution frequencies reduced the current cost by 37%. Conclusion The findings confirm a huge opportunity of getting the current vaccine distribution costs reduced when the distribution system is redesigned, hence contributing to financial sustainability of the vaccination program. Rwanda J Med Health Sci 2021;4(2): 207-221

Azaacenes Based Electroactive Materials: Preparation, Structure, Electrochemistry, Spectroscopy and Applications—A Critical Review

This short critical review is devoted to the synthesis and functionalization of various types of azaacenes, organic semiconducting compounds which can be considered as promising materials for the fabrication of n-channel or ambipolar field effect transistors (FETs), components of active layers in light emitting diodes (LEDs), components of organic memory devices and others. Emphasis is put on the diversity of azaacenes preparation methods and the possibility of tuning their redox and spectroscopic properties by changing the C/N ratio, modifying the nitrogen atoms distribution mode, functionalization with electroaccepting or electrodonating groups and changing their molecular shape. Processability, structural features and degradation pathways of these compounds are also discussed. A unique feature of this review concerns the listed redox potentials of all discussed compounds which were normalized vs. Fc/Fc+. This required, in frequent cases, recalculation of the originally reported data in which these potentials were determined against different types of reference electrodes. The same applied to all reported electron affinities (EAs). EA values calculated using different methods were recalculated by applying the method of Sworakowski and co-workers (Org. Electron. 2016, 33, 300–310) to yield, for the first time, a set of normalized data, which could be directly compared.

Excess Benefit Allocation in Shared Savings Based on Non-cooperative Game Theory

Energy saving income distribution mode is of great significance to the energy industry. With the continuous application of new technologies, the problem of excess energy saving income distribution has become one of the obstacles to the appreciation of energy performance. At present, the distribution of risk and income is mainly based on the contribution of risk and income, which has some limitations. The benefit distribution of energy saving negotiation between energy saving service companies and clients can be regarded as a bargaining process where an effective range satisfying both parties can be obtained. This provides a new perspective in solving the problem of excess energy saving income distribution in energy management contract projects.

Transportation Planning Using Conventional Four Stage Modeling : An Attempt for Identification of Problems in a Transportation System

In the formative development of urban transportation planning, travel forecasting is essential. Various travel simulation techniques are used to estimate possible traffic scenarios. It's been used to analyze road capability, transportation system developments, and new land use strategies and policies. The solution to travel decisions is generally obtained if the models are done in sequence. Many attempts are made to simulate the variety of choices made by travellers as a part of a response to a particular highway system, related transit system, and connected policies. For this purpose number of assumptions are considered regarding the decisions made by the people, factors considered by them, and their reaction as a response to the alternatives available in the transportation system. Generally, the process of travel simulation follows trip generating at the trip generation zone and moves through different links of the network and nodes. It ultimately ends at the trip attraction zone. The simulation method is known as Traditional Four Steps Transportation Modeling, and it includes the four basic models namely Trip Generation, Trip Distribution, Mode Choice, and Traffic Assignments. This paper it is tried to focus on the process of this traditional four-step transportation modeling system. The modeling method calculates a simplified transportation network from the city of Ulhasnagar, India.

Dolomitization Controlled by Paleogeomorphology in the Epicontinental Sea Environment: A Case Study of the 5th Sub-Member in 5 Member of the Ordovician Majiagou Formation in Daniudi Gas Field, Ordos Basin

The 5th sub-member in 5 Member Ordovician Majiagou Formation in Daniudi Gas Field, Ordos Basin, is deposited in an environment consisting of an ancient epicontinental sea, where very fine crystalline dolostone reservoir has developed. In this study, based on the petrological and geochemical characteristics, the genesis of the dolomite developed in M55 were studied by analyzing the properties and sources of the dolomitization fluids, and the influence of the paleogeomorphology differences on the distribution of dolostone was also discussed in order to clarify the distribution of the dolostone developed in the lime flat of the epicontinental sea. The dolostone of the M55 had a crystal structure, mainly including microcrystalline and very fine crystalline. The content of MgO and CaO in dolomite was negatively correlated, indicating that it was the result of replacement. The dolomite was dark red under cathode luminescence, and the distribution mode of rare earth elements showed the negative anomaly of Ce and Eu, indicating that the dolomitization fluid was sea-sourced fluid. The δ13C, δ18O, and 87Sr/86Sr isotope range of limestone was similar to that of Ordovician seawater in the study area, whereas the δ13C, δ18O, and 87Sr/86Sr of dolostone were obviously more positive than that of limestone. The substitute index of the salinity (Z) of the dolomitization fluid was higher than 122, which is higher than limestone (Z = 120.5), indicating that the dolomitization fluid was slightly evaporated seawater. The wormholes observed on the core and the gypsum in the penecontemporaneous period observed in the thin sections indicated that the dolostone was formed in a period when the sea level was relatively low, and it was the result of seepage–reflux dolomitization. By analyzing the correlation between the thickness of dolostone and the paleogeomorphology of the M55 of the sedimentary period, it was found that the thickness of dolostone at relatively high altitude was significantly larger than that of other areas. The development of dolostone was controlled by sea level, and the local paleogeomorphology controls the distribution of dolostone during the period of low sea level. There were many more limestone–dolostone cycles and larger cumulative thicknesses of dolostone at relatively higher topography. This study provides a theoretical basis for the prediction of the distribution of dolostone reservoirs in the carbonate tidal flat environment dominated by lime flats under the background of the ancient epicontinental sea.

Location and Layout of Common Storage and Multichannel Common Distribution considering Time Windows

In the process of logistic activities of common storage and common distribution, due to problems such as urban traffic congestion period, parking restriction, working time restriction, and road restriction time, people often agree on the arrival time for customer orders, so that the receiving and delivering parties can connect in time and speed up unloading and distribution. Therefore, considering the actual distribution operation, it is necessary to consider the location and layout of common storage and multichannel common distribution in time windows. This paper takes multichannel common storage and common distribution as the research object, combines with the actual distribution situation, considers the location and distribution route optimization of the common storage and common distribution mode under the condition of time windows, takes the form of linking time windows with distribution time completion efficiency, and forms a reverse constraint on the objective function by time completion efficiency, thus realizing the double-objective optimization of “minimizing the total cost and satisfying the time windows.” In addition, through the comparison of various intelligent algorithms, find that the squirrel search algorithm (SSA) has more stable performance and better solution results.