bluuebunny/crossref_metadata_2025 huggingface dataset:
The Visualization of Post Practice Management Based on Big Data Analysis
Authors: Zhang Wei , Liu Jialiang , He Liwen
Published: April 2020

Post practice is an important teaching form of vocational education, however, there is a lack of effective management methods in attendance and process monitoring of post practice. Starting from the management difficulties, this paper uses the mobile app management software to collect the data of the students’ post practice process, generates the corresponding visualization chart based on the big data analysis technology, carries out targeted and normalized management of each link of the post practice process, and then forms a set of fine management methods for post practice.
The scheme of personal privacy protection based on data separation in Mobile identity authentication
Authors: Zheng Fang , Li Pingzhen , Wei Jianqin
Published: April 2020

To avoid privacy leaked in mobile identity authentication by telephone number, this paper proposes a scheme of data separation that separates telephone number from server of service provider and stores it on trusted third-party server. In the process, we put forward some ideas to solve the problems brought by this scheme, which includes a table introduced to associate real identity and network one, a way of access authorization. Finally, we analyze the performance of the scheme and discuss the time efficiency by experiment.
Campus Parking Planning Based on Multisource Data Analysis--Taking Mafangshan Campus of Wuhan University of Technology as an Example
Authors: Huang Zhaoqi , Xu Xiaoyue , Luo Qingyue , Fang Danhui
Published: April 2020

In order to solve the problems of unbalanced supply and demand of campus parking resources, chaotic parking conditions, and potential safety hazards in campus traffic, a method of campus parking system planning based on big data is proposed. Taking the Mafangshan Campus of Wuhan University of Technology as an example, from the two aspects of time dimension and spatial dimension, the paper analyzes the trend of campus parking number, vehicle’s parking time, parking density and parking space utilization rate in each area, and discards the distribution of stranded vehicles according to the vehicle collection data. Finally, according to the analysis of multi-source big data, the current situation of campus parking system is obtained, and the corresponding planning results of campus parking are obtained. Through field research and big data analysis, we can intuitively understand the distribution and utilization of the overall parking resources of the campus, and the parking planning results based on this are more practical and scientific.
Analysis of Annual Return Rate Data of Enterprises Based on R Language
Authors: Lin Qi
Published: April 2020

As a simple and practical statistical tool, R language has become more and more widely used in the financial industry. This paper collects the monthly prices of 10 asset companies and uses R language as a tool for data analysis. The 10 asset companies are analyzed for the annual return rate and other indicators. This paper also draws on the MVP and t-copula investment strategies of securities investment to simulate the investment of these 10 asset companies.
A Conformal antenna with Proper Shape and Good Electrical Properties
Authors: Zhou Chang , Jin Wanwan , Xia Jing , Wang Li , Liu Gang , Xu Rongyu
Published: April 2020

A conformal antenna based on Teflon with proper shape to get more space is presented. It is accomplished by using three-dimensional simulation design software HFSS to achieve the best method. A special kind of Teflon has been chosen to meet the requirement for light weight and ease of installation. A series of antennas is designed and optimized and the best result shows that the conformal antenna could achieve 80% relative impedance bandwidth and peak gain>3dBi at 4GHz. The far-field patterns of antenna are also analyzed and have an acceptable performance. All the results show that this kind of antenna can work well for engineering applications with high cost.
Research on Performance of Different Hall-Effect Switch on Smart Meter
Authors: Dong Xianguang , Dai Yanjie , Zhang Zhi , Chen Zhiru , Wang Qing , Wang Pingxin , Yu Chao , Zheng Xue , Wang Tingting , Xu Ziqian
Published: April 2020

With the deepening application of smart meter and improvement of electricity information acquisition system, more and more problem recorded by smart meter being discovered in scene, such as constant magnetic field events, communication failure event. Some smart meter recorded tends of thousands constant magnetic field events and the reason is varied, however, the ultimate cause of the event is the hall-effect switch on smart meter. This paper just analyzed the event of constant magnetic that detected frequently by the electricity information acquisition system, and the result showed that the hall-effect switch from different manufacturers has different performance.
Research on market trading mechanism of distributed photovoltaic and electric heating load
Authors: Tong Xinyu , Zhang Yuze , Zhang Jie
Published: April 2020

Based on the analysis of the electricity sale mode of distributed photovoltaic and the electricity consumption trading mode of electric heating load, a market-oriented trading mechanism model of distributed photovoltaic and electric heating load is proposed, which provides a theoretical basis for the online analysis and operation control of distribution network under the market-oriented trading.
Static mechanic analysis of J-clamp connection mechanism for 10kV electric distribution network
Authors: Shaolei Wu , Yu Feng , Kai Wu
Published: April 2020

J-type clamp is used for bare wire live connection work, It is a power connection device for transmission and distribution systems. It’s performance and the size of the installation torque will directly affect the power transmission, If the installation torque is too large, the cable deformation will seriously affect the service life of the cable. If the torque is too small, the cable will be in poor contact or even the cable will fall off. In this paper, the three-dimensional finite element analysis model of j-type clamp was established. The stress and displacement of the clamp were analyzed by ANSYS Workbench simulation analysis software, and the analysis cloud map of the whole line clamp and main components was obtained. The analysis results can provide reference for the overall optimization of the clamp, and provide guidance for the standard installation of the clamp.
Research on Performance of Grounding Conductor Based on Multi-Physics
Authors: Xiangdong Sun , Hui Ding , Jinrui Cui , Yanwei Wang
Published: April 2020

The performance analysis of the grounding conductor is of great significance for improving the design and construction level of the grounding grid and rationally selecting the grounding conductor specifications.Based on the multi-physics analysis and calculation software COMSOL, this paper establishes a three-dimensional simulation model of the grounding conductor with the standard hexagonal M8 bolt as the research object.Firstly, the contact resistance of the grounding copper bus contact surface is calculated, and the influence of contact resistance is analyzed according to different factors. Then, the influence of different tightening torque on the maximum temperature of the contact surface under the condition of short-circuit current is calculated. Finally, the normal condition of the contact surface under different tightening moments and the pressure distribution characteristics during short-circuit are calculated. The results show that the bolt tightening torque, the surface roughness of the copper row, the selected grounding copper row material, and the overlapping area all have an effect on the contact resistance; When the grounding conductor is short-circuited, the maximum temperature on the contact surface decreases with the increase of the tightening torque. It is recommended to use copper as the material of the grounding conductor, and apply a tightening torque to the bolt at 24∼28N•m; At the same time, the distribution characteristics of the contact surface of the conductor under normal conditions are analyzed. Finally, based on the research results, the method of reducing the grounding resistance at the grounding conductor joint in practical engineering is proposed.
Design and study of slow wave structure of the THz folded waveguide TWT over 60W
Authors: Zhang Xiaohan , Cao Linlin , Li Fei , He Jun , Huang Mingguang
Published: April 2020

In this paper, the equivalent circuit method is used to analyze the dispersion characteristics of the folded waveguide and calculate the coupling impedance. The influence of the surface roughness and conductivity of the waveguide on the loss of the high frequency circuit is considered. In order to improve the efficiency of the beam wave interaction, the two kinds of slow wave structures of the folded waveguide TWT are designed by using the variable period technology. The three-dimensional electromagnetic software Microwave Tube Simulation Software (MTSS) is used to simulate the beam wave interaction of TWT. After optimization, the output power of both structures is over 60W, the electronic efficiency is more than 5.5%and the gain is greater than 32dB in the 211GHz-221GHz frequency range.
Research on Partial Discharge Breakdown Location Technology of 1000kV GIS in Field Test
Authors: Wang Hui , Yao Weijia , Song Simeng , Zang Yiming , Qian Yong , Sheng Gehao
Published: April 2020

During the field test, if the input and output lines and intervals of the withstand voltage test after the GIS equipment are segmented, and a non-self-recovery discharge or breakdown occurs during the test, only the hearing of the human ear will determine the exact location of the failure. It is more difficult, and it is easy for misjudgement to waste manpower, material resources and cause unnecessary damage to equipment. Therefore, in the field AC withstand voltage test of GIS equipment, finding the location of discharge breakdown is a key technical problem that needs to be urgently solved on the site. This paper studies the propagation characteristics and detection principles of electromagnetic wave signals and vibration signals that cause breakdown faults in 1000kV GIS, and develops a positioning system based on combined acoustic-electrical detection technology for AC withstand voltage of UHV GIS in the field. In the test, it was verified through actual test cases that the method can quickly and accurately locate the location of the breakdown discharge, and provided a set of convenient and effective technical means to ensure the smooth on-site withstand voltage test of GIS equipment.
Research on Adaptive Segmentation Design Method of Route
Authors: Zhang Jin , Jun Li Shu , Wang Mo
Published: April 2020

With the continuous improvement of China’s international influence and the gradual implementation and deepening of the “One Belt, One Road” strategy, The scope of the ship’s activities has expanded from offshore waters to global seas. In view of the limitations of the protection needs of offshore navigation for many years, the traditional maritime protection has the characteristics of fixed coverage, fewer factors involved, and lower informationization. This paper introduces the current vector route design method for avoiding obstacles, and proposes a new double-sided convex hull expansion algorithm for its deficiencies in algorithm complexity. The shortest path to avoid obstacles is planned, and the feasibility and superiority of the algorithm are verified by experiments.
Improved SVM algorithm for upper limb rehabilitation mechanical arm Study on the Prediction of Track Tracking Control
Authors: Zenan Chu , Wei Wang , Di Wang
Published: April 2020

Aiming at the strong coupling, nonlinear and time-varying characteristics of upper limb rehabilitation training manipulator, a trajectory tracking predictive controller based on SVM (support Vector Machine) is designed. The input and output data of the manipulator system are collected, and the generalized inverse system is obtained by SVM identification, which is decoupling from the original system in series. For the decoupling system, the improved SVM algorithm is used to predict the trajectory tracking control, and the SVM algorithm is improved by combining the predictive function control method of PSO optimized rolling control sequence. The improved SVM algorithm can predict the trajectory of upper limb rehabilitation manipulator with high precision, and the experimental results show that the improved algorithm has good adaptability to the stability and robustness of the system.
The correlation between GDP and different transport modes turnover based on grey correlation analysis
Authors: Wang Yongbin
Published: April 2020

Transportation is the inherent law of economic development. With the deepening of reform and opening up, the adjustment of economic and industrial structure, transport volume have driven GDP growth to varying degrees. Therefore, based on the 1990-2017 transport turnover and GDP in China, this paper studies the decoupling relationship between GDP and transport volume at different stages, in which traffic volume has a week decoupling with GDP. By using the grey correlation analysis, the degree of correlation between different freight and passenger transportation modes at sample period is calculated to demonstrate the similarity with economic growth.
Optimization Research of Emergency Resource on Rail Transit Allocation Location Considering Multiple Transport Modes
Authors: Cao Shaona , Li Dewei , Cao Shaona
Published: April 2020

Rapid and effective emergency rescue is the key to reduce the loss of accidents after the occurrence of subway emergencies. Existing studies have not considered the difference between different demand stations and the use of multiple transportation modes for rescue. Reasonable allocation of subway emergency resources and transportation modes for rescue can improve rescue efficiency. In this paper, an emergency resource allocation model is established to minimize the generalized cost. The proposed model has two characteristics: one characteristic is to take passenger flow demand and historical accident data into consideration and quantify the passenger flow and frequency of station accidents to reflect the importance of different demand stations. Another characteristic is that the single rescue transportation mode is expanded into multiple transportation modes. Taking network of Beijing subway as an example, the model is applied and solved by CPLEX. When the actual data from 2013-2015 are substituted into the model, the solution result is compared with that of previous research model. The rescue time of this model considering multiple transport modes is lower than that of model considering single transport mode by 25.86%, and the rescue efficiency is improved. It concludes that the allocation model considering multiple transport mode can effectively reduce the time for rail transit when recovering from accidents.
AGV Task Distribution Study
Authors: Wu Guorong , Sun Xuan
Published: April 2020

In this paper, the traditional AGV task allocation mechanism assigns tasks with large path cost and low operational efficiency. A single AGV dual task allocation mechanism based on task priority and FCFS is designed. By changing the order and distribution mode of the main categories of tasks, the mechanism assigns two different kinds of tasks to the AGV, which reduces the empty vehicle operation caused by the continuous execution of similar tasks by the AGV, thereby reducing the path cost and improving the operational efficiency of the AGV system. The open-TCS simulation calculation uses this method to increase the operating efficiency of the AGV system by 20%.
Applying post-processing techniques of computed tomography imaging in diagnosing aortic dissection
Authors: Cui Fengzhi , Wang Jianqiu , Jin Longhai , Gong Tingting , Li Bo , Xu Nannan , Liu Jianhua , Yuan Qinghai , Wang Lei
Published: April 2020

Post-processing techniques of computed tomography imaging are playing a dominant and critical role in evaluation of AD. It is vivid for showing the whole contour of aorta, from different view. Post-processing techniques not only provide information of location, but also provide information of invading range. It is referred as preferred investigative modality for the diagnosis of aortic dissection, and has been widely used in clinic. Recently, it has become the first choice for clinical to diagnose AD, then it could provide important information for clinical selection of AD of surgical methods.
Research on Text Representation Method Based on Improved TF-IDF
Authors: Fu Yu , Yu You
Published: April 2020

According to the different importance degree between feature and text, this paper proposes a method of improved traditional TF-IDF algorithm according to the position information of the words and the ability to distinguish the texts, and proposes a text representation method based on improved TF-IDF and the corresponding word vector calculation method. Finally, the effectiveness of the method is proved by experiments.
Research on Testing of Optical Fiber Wavelength Division Multiplexing System
Authors: Zhang Peng , Tian Xingke , Zhang Jianwei
Published: April 2020

In order to meet the requirement of long-distance high-speed data bus for information transmission in vehicles, optical fiber wavelength division multiplexing (FWDM) technology is used to realize the transmission of multiple optical signals by connector. Although wavelength division multiplexing technology has been widely used in the field of communication, the adaptability of the real-time control system needs to be further studied. In this paper, a prototype of the optical fiber wavelength division multiplexing system is tested and the test results are preliminarily studied, which provides a basis for evaluating transmission reliability margin and analyzing system failure.
Development of Deep Sea Pipeline Position and Attitude Measuring Device Based on Flange Center Positioning
Authors: Wang Zhuo , Di Qiao-yue , Wang Tao , Zhang Bo , Ma Hong-wen
Published: April 2020

In order to reduce the measurement uncertainty of deep sea pipeline position and attitude measuring device based on flange centre positioning, this paper evaluates the solution process of pipeline pose and proposes a positioning method based on flange centre positioning. The problem of deep water riser measurement operation is solved on the basis of reducing the uncertainty. The final design-related prototype verifies that the measurement method can effectively reduce the uncertainty based on the accuracy.
Dynamic BOM Construction Technology and Application Based on MBD
Authors: Fa Jing , Wen Yang , Yongan Zhang , Rong Zhou , Xiuhui Gao
Published: April 2020

In view of the problem that the information transfer based on unstructured documents and non-dynamic BOM results in the limited efficiency and precision of spacecraft assembly configuration management, a dynamic EBOM construction technology based on MBD model is proposed. By adding assembly Configuration attributes to MBD model, it can cover the data requirements of spacecraft assembly process. The EBOM is constructed by extracting Assembly structure tree, product and configuration attributes of MBD assembly model. The dynamic EBOM is constructed by changing the value of the attributes describing the assembly Configurationin the EBOM. On this basis, through the comparison between the EBOM and the implementation BOM, the Configuration of spacecraft assembly is quantitatively controlled.
Centrifugal Effect of Thrust Plate of Water-lubricated Thrust Bearing and its Influence Mode
Authors: Zhang Haonan , Zheng Weigang , Li Fuxin
Published: April 2020

Water-lubricated thrust bearing with water as the medium, is a mechanical transmission medium with energy saving and environmental protection. The thrust bearing with water medium can reduce the wear of bearing and the friction between gears. At the same time, the shape of the rolling bearing in the state of high-speed operation is bound to undergo a series of changes, and the radial working clearance is also slightly changed due to the centrifugal effect under high-speed operation, which has a certain degree of influence on the thrust disc. The shielded thrust disc avoids the problem of loose sealing, and the tilting thrust bearing has the advantages of obvious centrifugal effect, large rotating inertia of the thrust disc and large bearing size. In view of the characteristics of thrust bearing structure of water medium, this study established the coupling calculation model of the thrust plate after centrifugal denatination based on the finite element analysis method, and explored the design parameters of two key clearances in the assembly structure of the thrust plate. It is found in this paper that the tilting pad bearing under low speed steering will compensate for the deformation of the thrust disc, and when the rotating speed is greater than 3600r/min, the centrifugal deformation of the thrust disc will increase in morphology and even lead to lubrication failure. Therefore, the speed is an important factor that influences the centrifugal effect of the thrust disc and the bearing disc body enlargement.
Research on the influencing factors of small bending radius elbow stamping based on CAE simulation
Authors: Lian Long , Xia Qianjin , Cao Yu , Li Xiaoxue , Su Li
Published: April 2020

The elbow with small bending radius is widely used in heating system and line collecting system, but its processing is difficult. Using the way of sheet metal stamping processing half elbows, and then welding the two half elbows is an effective method. There are a series of key parameters in the process of elbow stamping, which directly affect the forming result. Using sheet metal stamping software for stamping simulation, and comparing the effects of the parameters on thinning and principal stresses, we can see the specific effects of different parameters on the shaping. The main influencing factors of elbow stamping include friction coefficient, clearance, blank holding force and sheet metal thickness. For the friction coefficient and blank holder force, it should be selected near the minimum value. For clearance and sheet metal thickness, it is proportional to the forming effect.
Effects of Acute Moderate Intensity Exercise on the EEGFrontal Alpha Asymmetry
Authors: Xiao Zhangyan , Long Zhengji , Gao Pengfei , Qin Chaoling , Liu Guangyuan
Published: April 2020

Exercise can improve physical and psychological states efficiently. Previous studies have shown that the frontal alpha asymmetry can be used to express emotional states, while relative activity in the larger left frontal can predict positive effects. In this study, our purpose is to observe the effects of pedalling exercise (PE) on the frontal alpha asymmetry during negative stimulation. The electroence phalograph (EEG)signals obtained are processed by matlab to obtain the frontal asymmetry value. By observing and comparing the frontal alpha asymmetry between two groups, we can find that the frontal alpha asymmetry of the sports group increased significantly, while the control group have no significantly change. The study shows that the acute moderate intensity PE can improve the resistance to negative stimuli and increase positive emotions.
Fast Processing of UAV Remote Sensing Image Based on DSP Hardware Simulation Platform
Authors: Liu Fan , Guan Guixia , Zhao Haimeng , Sun Peng , Yan Lei
Published: April 2020

The traditional unmanned aerial vehicle (UAV) remote sensing image processing algorithm is difficult to guarantee both accuracy and speed when dealing with massive data of UAV network. This paper designs an on-the-spot processing system based on portable digital signal processor (DSP) hardware simulation platform. The bilinear interpolation algorithm is optimized and improved for the adaptability of the DSP platform with the reference of the bicubic interpolation algorithm, which is long time-consuming but high accuracy. The nearest neighbor interpolation is merged in the bilinear interpolation algorithm, which improves the edge blurring problem of bilinear interpolation algorithm. In the loop calculation of the multiplication and addition iteration calculation segment of the algorithm, the parallelism of the instruction level is increased by increasing the instruction level parallelism between the loop bodies. Experiments show that, on the basis of ensuring the accuracy of the bilinear interpolation algorithm, the execution speed of the processing algorithm is improved, which can meet the requirements of fast real-time processing of remote sensing images of complex unmanned aerial vehicles.
Load Prediction for AGV Quasi-Stop Control
Authors: Wang Guangqi , Sun Xuan
Published: April 2020

In the AGV variable load quasi-stop problem, in order to establish the quasi-stop mathematical model, it is necessary to judge the magnitude of the load. According to the current load characteristic of the motor, the motor output current is positively correlated with the load. For this reason, a motor current start Characteristic load prediction method is proposed. Firstly, the ARM-based AGV DC servo motor current measurement experimental platform is built according to the needs. Secondly, in order to extract the effective data, we collected the current data under different loads and analyzed the overall law of the data and, and the linear regression analysis and least squares fitting of the effective data are performed. Finally, the mathematical model between load and current is established, and the model is brought back to the AGV experimental platform to verify the model. The experimental results show that the mathematical model can predict the load and the prediction accuracy is around 5%, which proves the effectiveness of the proposed method.
Effect of Crosslinker Concentration on the Comprehensive Properties of Polyacrylamide-aluminium Citrate/Water Glass Gel
Authors: Ren Han , Qu Nannan , Wang Yunna , Qiu Xiaoxuan , Liu Qing , Chi Pengde
Published: April 2020

In this paper, the authors discuss the polyacrylamide-aluminum citrate/water glass gel and set the gradient on the cross-linking agent aluminum citrate to study the cross-linking agent content of polyacrylamide-aluminum citrate/water glass gel. The influence of properties, viscosity, strength and resistance characteristics, found that the water retention rate, viscosity and strength resistance of polyacrylamide-aluminum citrate/water glass gel increased first with the increase of aluminum citrate. After the reduction. Among them, when the amount of the cross-linking agent aluminum citrate is 1.2 wt%, the polyacrylamide-aluminum citrate/water glass gel performs excellent in various aspects. The optimal ratio of polyacrylamide-aluminum citrate/water glass gel is finally confirmed, which provides theoretical support for its application in coal mines.
Cellulase derived from Chryseobacterium indologenes LA4K isolated from Indonesian agar-agar industry solid waste
Authors: Munifah I , Basmal J , Kusumawati R , Irianto H E
Published: April 2020

Hydrolysis process can be a challenging task to perform because the required enzymes are difficult to find and microbial culture is relatively expensive. However, the process can be made more economical by utilizing enzymes which can be produced using substrates derived from local materials. One example of such materials is the solid waste generated by industries involving agar-agar which is obtained from the red alga Gracilaria sp.
Chryseobacterium indologenes LA4K is an indigenous bacterial variant which is isolated from agar-agar industry solid waste. The cellulolytic enzyme of C. indologenes LA4K was processed using a medium of 2.5% agar-agar industry solid waste which was incubated for six days and showed an activity of 0.3726 U/mL. Reaction incubation temperature exerted some influence on the activity of C. indologenes LA4K: the process produced the optimum activity of 0.3246 U/mL at the temperature of 40°C, while 30 minutes was determined as the optimum incubation period needed by both enzyme and substrate of C. indologenes LA4K to react. The enzyme entirely lost its activity when heated to the temperature of 80°C. The activity of LA4K cellulase increased with an addition of divalent ions (Mg2+, Ca2+, and Zn2+) and monovalent ions (K+ and Na+). An addition of trivalent ion Fe3+ to C. indologenes LA4K cellulase acted as an inhibitor to its activity. Addition of ethanol as an organic solvent to the supernatant crude enzyme caused the enzyme to become denatured, thus reducing the cellulase activity of its C. indologenes LA4K isolate to 85.47%. The presence of anionic detergent SDS in the crude cellulase of C. indologenes LA4K increased its activity to 105%. Addition of nonionic detergents Triton X-100 and Tween 80 to C. indologenes LA4K cellulase increased its activity to 130% and 110.9%, respectively.
Tannin characteristic from Hevea brasiliensis and Durio zibethinus with pressure and hot water extraction
Authors: Sujarnoko T U P , Jayanegara A , Ridwan R , Nahrowi
Published: April 2020

The aim of this study was selected the best bark, temperature and pressure for extraction phenol and tannin with hot water solvent. The extract was characterised into condensed tannin and hydrolysable tannin with spectrophotometer. Tannin are plant secondary compound that influence feed metabolisme in the rumen and pasca-rumen organ. Tannin have ability to bounding feed protein and other nutrient. Tannin classified into condensed and hydrolysable tannin, condensed tannin is a bypass agent to decrease deamination and other nutrient degradation in the rumen organ, furthermore hydrolysable tannin may divide as phenol and sugar group in the rumen. Phenol group form HT may become antioxidant in the blood and influence rumen ecology. The result for this study is Hevea brasiliensis has phenol and tannin content more than Durio zibethinus with P<0.01 if using hot water extraction. Temperature significantly influence concentration of phenol and tannin content, at 120 °C phenol and tannin extract more than 70 °C with P< 0.01. Phenol extract significantly effected by pressure, 1 bar get phenol and tannin more than 2 bar with P<0.01. Treatment in this study have interaction, so generally concluded that to get phenol and tannin extract the highest used Hevea brasiliensis with temperature 120 °C and pressure 1 bar.
The shelf life of yogurt starter and its derivatives based on the microbiological, physical and sensory aspects
Authors: Priadi G , Setiyoningrum F , Afiati F
Published: April 2020

Yogurt quality is affected by the yogurt starter. The aim of this study was to determine the shelf life of yogurt starter and its derivatives based on microbiological and physical and sensory aspects. Yogurt starter is made from commercial dry culture, then lowered to 4th derivative, and stored in the refrigerator for up to 25 days. The result showed that there was stability in the viability of total microorganisms and mold in yogurt starter and its derivatives. The viability of lactic acid bacteria (LAB) decreased from F1 to F4. Decreasing pH and little whey formation occurred during the storage. The yogurt quality made from the starter and its derivatives was acceptable. The shelf life of F1, F2, and F3 starter is 25 days, while F4 is 20 days.
The effects of turmeric extract addition on physical and sensory characteristic of arenga-arrowroot starch noodle
Authors: Herawati E R N , Ariani D , Miftakhussolikhah M , Ningrum V A , Pranoto Y
Published: April 2020

Arenga-arrowroot starch noodle is an alternative carbohydrate source made from 75% arenga starch and 25% arrowroot flour. This starch noodle has a bright brown-opaque color character which needs the addition of coloring agents to improve its physical appearance. The aim of this study was to determine the effects of turmeric extract addition on physical and sensory characteristic of the arenga-arrowroot starch noodle. Five variations of concentrations were given to turmeric extract, there are 3%; 6%; 9%; 12%; and 15% w/w. Physical properties which have been analyzed were starch noodle’s color, compression strength, tensile strength, and elongation. Sensory properties which have been analyzed were hedonic scoring for color, odor, taste, overall acceptance and descriptive test for taste parameter. The results showed that addition of turmeric extract give an impact on physical and sensory characteristic of arenga starch – arrowroot flour noodle. Addition of turmeric extract cause the decrease of noodle color brightness. The addition of turmeric extract decreased the compression test, elongation and tensile strength of arenga starch-arrowroot flour noodle. Turmeric extract addition increased the yellow color. In sensory analysis, addition of turmeric extract in small quantities (3%, 6%) has no significant different compared to noodle control based on overall acceptance.
The effect of encapsulated Pediococcus lolii L2 on its cell viability and α-glucosidase inhibition activity
Authors: Nurhayati R , Miftakhussolikhah  , Oktavianingrum D A , Pratiwi R
Published: April 2020

Alpha-glucosidase is an enzyme that catalyzes the breakdown of α-glycosidic bound in carbohydrates, cause increasing of blood sugar level. Hyperglycemia conditions can bring an adverse impact on people with diabetes mellitus. One therapy to control blood sugar levels is to suppress the activity of α- glucosidase activity. Pediococcus lolii L2 is a potential probiotic that produce an α-glucosidase inhibitor. We need to maintain the viability and functionality of probiotics when applying to food industries. One of the methods for protecting the cell viability of bacteria and the inhibition activity is microencapsulation using spray dry. This research aimed to know the viability and α-glucosidase inhibition activity of Pediococcus lolii L2 after spray dry. We used maltodextrin, arabic gum, sodium alginates (SA), SA + maltodextrin, and SA + arabic gum as a carrier for probiotics for our reseach. The result showed that microencapsulated bacteria have higher viability with >85% of encapsulation efficiency. Likewise the ability of α-glucosidase inhibition. There is no significant difference of five materials used to encapsulate the cell with the inhibition activity.
Change of solvent proportion effect on pilot plan scale extraction of alginate from Sargassum sp.
Authors: Kusumawati R , Basmal J , Utomo B S B
Published: April 2020

Alginate extraction from Sargassum sp. pilot plant scale has been done. The extraction technique used refers to the modification of laboratory scale extraction techniques using acidic methods. On a scale of 1 kg of raw material, modification of the extraction technique was carried out on the proportion of bleaching material, sodium hypochlorite (NaOCl), which was originally 4% (v/v) to 2% (v/v). On a scale of 3 kg of raw material, modifications are made to the volume of water for extraction, which was originally 30 times the weight of the raw material to 20 times the weight of the raw material. On a scale of 10 kg of raw material, modifications are made to the ratio of water binder, iso propyl alcohol (IPA), which was originally 8 times the weight of the raw material to 3 times the weight of the raw material. The results of the study show that modification of the solvent carried out at each production scale causes an increase in yield (17.97, 19.79, and 22.67%) and a decrease in viscosity (128.43, 55.03, and 40.27 cPs).
Physical and mechanical properties of natural fiber from Sansevieria trifasciata and Agave sisalana
Authors: Widyasanti A , Napitupulu L O B , Thoriq A
Published: April 2020

Sansevieria and sisal plants are ornamental plants that are very famous in Indonesia. Both are plants grow easily even though in the area with less water and sunlight. These plants have potential natural fibers that are used as raw material requirements for the fabric textile industry. The aims of this research were to determine physical and mechanical characteristics of sansevieria and sisal for fibers utilization. The mechanical decortication process was used for fiber extraction. The research method used was an experimental laboratory with a descriptive method. Parameters measured were length and diameter of fiber, color, fineness, moisture regain, tensile strength, and stretch strength. The results revealed that sansevieria and sisal fibers have diameter 103,60 μm and 182,50 μm; average length 68,40 cm and 81,60 cm; brightness level (L*) 67,62 and 66,42; yellowness (b*) 20,42 dan 23,80; fineness 6,30 tex and 19,70 tex; moisture regain 11,93 and 12,57 tensile strength per bundle 24,891.60 gf and 35,263.90 gf; stretch strength per bundle 20% and 22,90%. The physical and mechanical characterization showed that sisal fiber had better characteristics than sansevieria fiber. Fibers from these two plants have potential textile material characteristics, which are used as a needle.
Adsorption of basic dye methylene blue by brown algae Sargassum duplicatum
Authors: Pratiwi D , Poeloengasih C D , Suryani R , Rizqi N C
Published: April 2020

The ability of raw and dried Sargassum duplicatum to remove methylene blue (MB) from aqueous solution was evaluated. Brown algae. S. duplicatum before and after MB adsorption was characterised by Fourier transform infrared spectroscopy (FT-IR). Batch experiments were conducted to examine the effects of parameters such as initial pH, biomass dosage, contact time, and initial dye concentration on MB Adsorption. The optimum adsorption was found at around pH 5, adsorbent dosage 1 g/L, and initial concentration of MB at 20 mg/L. Adsorption occurs very fast in first 5 min and reaches the equilibrium at 70 min. The maximum percentage of dye removal was 88,9%. This study suggests that S. duplicatum has good potential capacity to remove MB dye and could offer promising opportunity as a low-cost biosorbent.
A simple method for analysis of Saccharomyces cerevisiae morphology by applying a high vacuum mode of the scanning electron microscopy and without chemical fixatives
Authors: Karimy M F , Damayanti E , Suryani A E , Prasetyo E , Nurhayati R , Anwar M , Anggraeni A S
Published: April 2020

A simple method for the preparation of a specimen for observingSaccharomyces cerevisiaeB-18 by using a high vacuum mode setting of scanning electron microscopy (SEM). The method without chemical fixatives (F0) was very simple, the culture was directly taken from Chloramphenicol Yeast Glucose Agar (CYGA) by using a loop needle and coated with a film of gold (Au) without using any chemical fixative and only air dehydrating procedures. The method with chemical fixatives (F1) like osmium tetroxide (OsO4), is highly toxic and corrosive. The methods also take much time for the preparation of samples before observation. The morphology ofS. cerevisiaeB-18 was observed of two magnifications, 5K and 10 K and over a range of time setting of ion sputter and one current that is ten mA. The treatments of ion sputter current exposure in this study were ten mA for 10 (T10), 20 (T20), 30 (T30), 40 (T40), 50 (T50), and 60 (T60) seconds. This preparation procedure could be most useful forS. cerevisiaemorphological screening of rapidly and safely than using chemical fixatives before using adequate preparation procedure with chemical fixatives and could substitute light microscopy method with better magnification. The best result is the ion sputter setting ten mA for 60 seconds (T60) without any charging phenomenon disturbances. We have suggestions for F0; the first is the maximum duration of the sample that had air-dried is about three hours because more than its period, the resolution would be not proper. The optimum period for observation in the chamber in the high vacuum condition is about two hours and the second to developing methods so that representation for cell diameter measurements can be even better than this study.
Cellulose extraction from sugar palm (Arenga pinnata) fibre by alkaline and peroxide treatments
Authors: Fitriana N E , Suwanto A , Jatmiko T H , Mursiti S , Prasetyo D J
Published: April 2020

Cellulose is a versatile polymer which can be extracted from various agricultural waste. Sugar palm (Arenga pinnata) fibre (SPF) is one of potential cellulose source. The cellulose extraction from SPF was conducted by alkaline treatment with sodium hydroxide (NaOH) solution (10%) and peroxide treatments with hydrogen peroxide (H2O2) solution (5, 10, 15%). The alkaline treatment was supposed to remove most of hemicellulose and some of lignin. The following peroxide treatment aimed to remove remaining lignin. The results of each step were analyzed its composition, visual appearances, colour and morphological aspect. The results showed that increasing of H2O2 solution concentration not only tends to increase cellulose content and whiteness but also reduce the diameter size of fibre which indicates the removal of impurities (hemicellulose and lignin) from the fibre. In conclusion, cellulose was successfully extracted from SPF by alkaline treatment followed by peroxide treatments which the best result was in condition of 15% H2O2 solution concentration.
Alkaline pretreatment of sugarcane bagasse on pilot scale reactor
Authors: Rizal W A , Maryana R , Prasetyo D J , Suwanto A , Wahono S K
Published: April 2020

Sugarcane bagasse is one of the potential raw materials for producing bioethanol based on lignocellulosic biomass.The aim of this study is to determine the percentage of lignocellulose over the duration of the pretreatment delignification process.The delignification of pilot scale in the form of a reactor batch has a volume capacity of 147 L with a working volume capacity of 120 L. Sugarcane bagasse used in this process was 3 kg per batch with a size of 50 mesh. The pretreatment method was carried out chemically using NaOH at a concentration of 1 N, a working temperature of 120°C with a pressure of 2 bar and the variation of the delignification time was 1,1.5, 2, 2.5, 3, and 3.5 hours.The highest cellulose content from this study was found at delignification time of 1.5 hours which was 77.26%, greater than the sugarcane bagasse without pretreatment, with a cellulose content of 43.48%. At reaction time of 2 to 3.5 hours, the results showed a decrease in cellulose content with an average gain of 74.63%.Thus increasing the time in the chemical delignification pretreatment process did not affect the increase in cellulose percentage acquisition.
Architecture of residential wooden houses in the cities of Samara province in the second half of the XIX - Early XX centuries
Authors: Sysoeva E A , Samogorov V A
Published: April 2020

The article discusses the features of wooden and stone-wooden buildings of county towns and large trading villages of the Samara province of the second half of the XIX – early XX centuries. The prerequisites and main factors for the development of wooden architecture in the Samara province are presented. A brief description of the planning features of settlements is given. Common features and distinctive features of wooden architecture are identified. Residential buildings, style solutions used in the design of facades, decorative elements, as well as design features of wooden and stone-wooden buildings are considered.
Analytic method of structural analysis of modular buildings
Authors: Shirokov V S , Gordeeva T E , Bocharov A Yu
Published: April 2020

The paper presents an analytical method of modular buildings calculation. It focuses upon basic design assumptions that are accepted for modular buildings calculation. The authors introduce their classification of loads and impacts, which are basic for modular buildings. They also describe a method of determining inertial forces from seismic action designed on the basis of a cantilever analytical model. Analytical and numerical methods for determining the forces in the elements of modular units are further compared. It is revealed that the analytical method strongly agrees with FEM (that is the finite elements method) with the error being 2-6%. The analytical method is sufficiently accurate for engineering calculations.
Macrophage checkpoint blockade: results from initial clinical trials, binding analyses, and CD47-SIRPα structure–function
Authors: Jalil AbdelAziz R , Andrechak Jason C , Discher Dennis E
Published: April 2020

The macrophage checkpoint is an anti-phagocytic interaction between signal regulatory protein alpha (SIRPα) on a macrophage and CD47 on all types of cells – ranging from blood cells to cancer cells. This interaction has emerged over the last decade as a potential co-target in cancer when combined with other anti-cancer agents, with antibodies against CD47 and SIRPα currently in preclinical and clinical development for a variety of hematological and solid malignancies. Monotherapy with CD47 blockade is ineffective in human clinical trials against many tumor types tested to date, except for rare cutaneous and peripheral lymphomas. In contrast, pre-clinical results show efficacy in multiple syngeneic mouse models of cancer, suggesting that many of these tumor models are more immunogenic and likely artificial compared to human tumors. However, combination therapies in humans of anti-CD47 with agents such as the anti-tumor antibody rituximab do show efficacy against liquid tumors (lymphoma) and are promising. Here, we review such trials as well as key interaction and structural features of CD47-SIRPα.
Serine protease inhibitor disrupts sperm motility leading to reduced fertility in female mice†
Authors: Barton Brooke E , Rock Jenna K , Willie Anna M , Harris Emily A , Finnerty Ryan M , Herrera Gerardo G , Anamthathmakula Prashanth , Winuthayanon Wipawee
Published: April 2020

Inhibition of the sperm transport process in the female reproductive tract could lead to infertility. We previously showed that a pan-serine protease inhibitor, 4-(2-aminoethyl)benzenesulfonyl fluoride (AEBSF), blocked semen liquefaction in vivo and resulted in a drastic decrease in the number of sperm in the oviduct of female mice. In this study, we used a mouse model to test the efficacy of AEBSF as a reversible contraceptive, a sperm motility inhibitor, and a spermicide. Additionally, this study evaluated the toxicity of AEBSF on mouse vaginal tissues in vivo and human endocervical cells in vitro. We found that female mice treated with AEBSF had significantly less pups born per litter as well as fertilization rates in vivo compared to the vehicle control. We then showed that AEBSF reduced sperm motility and fertilization capability in vitro in a dose-dependent manner. Furthermore, AEBSF also exhibited spermicidal effects. Lastly, AEBSF treatment in female mice for 10 min or 3 consecutive days did not alter vaginal cell viability in vivo, similar to that of the vehicle and non-treated controls. However, AEBSF decreased cell viability of human ectocervical (ECT) cell line in vitro, suggesting that cells in the lower reproductive tract in mice and humans responded differently to AEBSF. In summary, our study showed that AEBSF can be used as a prototype compound for the further development of novel non-hormonal contraceptives for women by targeting sperm transport in the female reproductive tract.