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Introduction Theses is not only a comprehensive test for students’ capacity of using the professional knowledge, researching, analyzing and solving practical problems, but also a comprehensive test for the effect of cultivation on students' overall quality and the ability of engineering practice, which is a systematic training for creative spirit and practical ability.
The objects of cluster analysis must be the groups who have not been classified, and the actual classification problems are often with ambiguity, such as: the classification of environmental pollutions, the data classification of clinical symptoms, classification of rocks, water quality analysis.

PET has become a material of choice for bottling beverages, such as mineral water and carbonated soft drinks.
Edition: 2, illustrated Published by McGraw-Hill Professional, New York, USA (2006) [3] H.

Planning for Additional Power Generation Capacity in the South Sulawesi Area Based on the OSeMOSYS Model SAHID Pangampe1,a, IKHLAS Kitta1, 2,b, *, ARHAM Amri1,c and KEISHA MAHIRA Ikhra1, d 1Department of Electrical Engineering, Hasanuddin University, Indonesia 2Study Program of Engineering Professional Education, Hasanuddin University, Indonesia asahidpangampe19@gmail.com, bikhlaskitta@gmail.com, carhamamri80@gmail.com, dkeisha.mahira72@gmail.com *The corresponding author Keywords: OSeMOSYS, Planning, Energy, Power Generation, South Sulawesi.
Garcia, Optimal planning of energy and water systems of a small island with a hourly OSeMOSYS model, Energy Conversion and Management 276 (2023) 116541

Testing of Tensile Strength and Elongation at Break of Polymer Packaging Materials TANOVIĆ Petra1,a, SAVIĆ Branko2,b, MNERIE Gabriela-Victoria2,3,c, MNERIE Dumitru3,4,d 1Higher Education Technical School of Professional Studies in Novi Sad, Novi Sad, Serbia Address: Školska 1, Postal Code 21000, Novi Sad, Serbia 2National Research & Development Institute for Welding and Material Testing - ISIM, Address: 30, Blv.
Even in prehistoric times, man had the need to leave water and collected food for times when he would not be able to find them.
Polypropylene features good water vapor impermeability, which allows the contents to be preserved without mass loss, while EVOH provides an excellent barrier against the passage of oxygen from the atmosphere to the food, enabling the preservation of fats from oxidation [9].
The following tests are performed: thickness, mass per unit area, specific mass, tensile strength and elongation at break, dry residue of extraction, suitability for thermal processing, light permeability, gas permeability, water vapor permeability, and tests for the health safety of the materials.
In the context of the control of the aforementioned packaging materials, tests were conducted on the uniformity of film thickness, tensile strength, elongation at break, and gas, water vapor, and light permeability.

Since 2002, by ways of restructuring and creation, the Chongqing municipal government has established Chongqing city group, Chongqing real estate group, Chongqing water group, Chongqing highway development, etc.
Chongqing territory of mountains and waters area accounts for 94% of the total area, therefore, Chongqing city reasonable development framework should be group development layout.
But the mountain and water area of Chongqing is 94 percents of the total area.
Water burst, landslides and complex geological condition cause large-scale bridge engineering and protective retaining engineering in construction of expressway.
Set the Chongqing expressway as an example, every year the high-end maintenance equipment and related professional maintenance personnel limit the amount of overhaul of highway at 100 kilometers.

The main application areas of electrospun materials include, biomedicine: tissue engineering, (hard (bones) and soft tissues (skin, blood vessels, muscles and nerves, cartilage, tendons and ligaments)) and controlled drug delivery; energy/electronics: energy storage devices (supercapacitors and batteries), energy conversion (solar cells and piezoelectric systems for energy storage) and sensors; environmental protection: air filtration and water purification; chemistry: catalysts support; functional textiles: protective clothing, superhydrophobic and superhydrophilic materials, directional water transfer materials; others: acoustic isolation, reinforcement in polymer matrices etc. [1].
Silk fibroin is obtained from the silk worm cocoons, provides adaptable biodegradability, biocompatibility and good oxygen/water vapor permeability.
In salt/particle leaching the salt or other porogens are added directly to the polymer solution [70] or sieved in-between the electrospun layers [71] and then leached out by immersion of the scaffolds into water.
Squire, Fibrous proteins: Coiled-coils, collagen and elastomers, first ed., Gulf Professional Publishing, 2005

As a result, soil, surface water, underground water and atmosphere in the contaminated sites have seriously threatened human health and ecological environmental safety.
Health risk assessment for contaminated sites refers to analyzing the main exposure pathway of human to pollutants in soil and underground water in the contaminated sites and assessing carcinogenic risk or hazard quotient of these pollutants to human health on the basis of site environment investigation [5].
Sampling and analysis On the basis of the investigation and analysis on the previous production history, raw materials, products, production process and pollution prevention and renovation measures regarding this site, a professional judgment method is adopted to set sampling points of maximum likelihood and representativeness for collecting topsoil samples and deep soil samples.
Pollution factor Concentration range [mg•kg-1] Evaluation standard * [mg•kg-1] Maximum excess multiples Screening levels of contaminated site soils**[mg•kg-1] 1 As 6.5～61.5 20 2.1 20 2 Cr 67.9～52471.9 190 275.2 250 3 Cr(Ⅵ) 1.3～25080.8 30* 12539.4 30 4 Ni 13.7～468.8 50 8.4 50 5 Cu 17.1～108.8 63 0.7 600 Note: “*” indicates that the data is sourced from Grade A standards specified in the Assessment Standards for Soil Environmental Quality of Exhibition Lands (Provisional) (HJ350-2007) [7], and “**” indicates that the data is sourced from the screen levels of soil pollutants for health risk assessment values of residential lands specified in the Screening Levels for Soil Environmental Risk Assessment of Sites (DB11/T 811-2011) [8]; Environmental risk assessment model RBCA model RBCA (risk-based corrective action) is the action principle issued by American Society for Testing and Materials (ASTM) for soil and underground water pollution control, and US GSI Environment Co., Ltd. has developed

Furthermore, the lotus (Nelumbo nucifera) leaf is well known for its inherent self-cleaning property due to having extremely high water-repelling capacity and superhydrophobicity.
A combination of micro/nanoscale structure and low surface energy material (epicuticular wax crystals) contribute to the excellent self-cleaning and superhydrophobic behavior of lotus leaf, where such surfaces exhibit high water contact angle (> 150°) and low sliding angle (< 10°) [5].
Superhydrophobic surfaces (water contact angle >150°) tend to resist bacterial cell attachment [6].
The processed general writing language (.GWL) file was then transferred to a Photonic Professional GT (Nanoscribe GmbH, Germany) for printing of 3D nano-/microstructures.
The materials were fixed using 4% paraformaldehyde for 30 mins and dehydrated by immersing the samples in ethanol and water mixtures with increasing concentrations (50%, 60%, 70%, 80% and 99.8%), and then dried using different parts of ethanol and hexamethyldisilazane (HMDS) solution starting from (2:1), (1:2) and pure HMDS in a fume hood.

The consequences of the destruction of environment resource need to be shared by the surrounding waters, and the builders of ecological environment cannot enjoy alone the ecological protection and construction achievements.
Such research was mainly focused on forests, lakes and water resource; however, the MEC is tested relatively less.
In the source of funds, China currently has no special ecological tax while ecological taxation is used more and more widely abroad, such as special tax of the Germany's natural protection and water tax of Japan in addition to government subsidies, financial aid, domestic and foreign funds. 3.3 The revelation to China Study on international ecological compensation has mainly inspiration for Chinese MEC: 1) Construction of the national strategic framework in ecological compensation It is necessary to reflect the principle of the current most major issue in the system design and publish regulations and laws and regulations of MEC as soon as possible [18], can choose the place was chose to pilot, for example the coastal areas of Shandong, Liaoning and other areas.
The supervision of ecological compensation fund is strengthened, and each fund appropriation should hire professional third party institution to audit and establish a strict responsibility system. 4.1.2 The optimization of the tax policy There is no specialized tax in MEC currently.
[8] Yongtian Xu, in Chinese: China Water Resources, 2011 (4): 29-38

If air conditioning fans and fan coils are gathered together with loads with same cost such as lighting and electric water boiler and use same trunk line to supply power, not only use one fire alarm command to cut off the non-firefighting power, but also transmit smaller load current by same cross section of trunk line, so as to reduce the line loss when air conditioners are not used in Spring and Autumn.
Specially, the motor with the following operation conditions should be applied initially: (1) The motors in water source pump station which are far away from power supply
The high efficiency motor can be selected generally if meet the following conditions: (1) Load rate is above 0.6; (2) Annual continuous operation time is above 3000h; (3) No frequent startup and braking when motor is running (light-load startup is the best, such as fan load and water pump load); (4) Unit capacity is bigger. 7.2 Select AC frequency conversion device One of measures to save power energy in China currently is to promote AC motor speed regulating energy saving technology.
The soft starter is commonly used for water pumps which have big capacity and are started up frequently, as well as used for the field nearby where requires high stability for voltage of equipment.
Beijing: China Architecture & Industry Press, 2004 [3] Professional Exam Review Guidebook for Registered Electrical Engineer Qualification Examination.