Part 4 Report writing(150words )(20分) Informal report

Memo report

Date: January 19 ,2015

From:Zhang Liran

To: Zhao Jiaqi

C:Zhang Chengfei

Subject:

Introduction

I’ve completed the investigation on Android system and IOS system. This memo report presents the results of my investigation along with my recommendation. I investigated many users including students and office workers of all age groups.

Conclusion

The Android system is more popular to phone users. It has more application software. IPhones has a smart looking and a too expensive price. And many people feel difficult to use IOS system.

Recommendation

My recommendation is to use the Android system rather than IOS for our new phone.

Analysis report 1

Date: January 19 ,2015

To: Zhao Jiaqi

From:Zhang Liran

Subject: selection of super plasticizer in cement paste

Objective

To show that PC super plasticizer will increase the dispersion and stability of thefresh cement paste.

Summary

After long-distance transmission, rheological property of cement paste becomeworse off. This problem will be solved by adding PC super plasticizer, to reduce thecement particles coagulation again.

Introduction

In response to your request that I research the different types of superplasticizer(LS,PNS,PC), in gathering this information, I reviewed many literatures andmode a lot experiments. This report explains the properties of PC in fresh cement paste.The properties consist of dispersion and stability.

Conclusion

Through the performance comparison ,the results are as follows: 1. Three types of super plasticizer have the ability to disperse the cement particles,however, PC has stronger dispersion than others. 2. LS has little stability , PNS has a little stability , however, PC has better stability.

Discussion

The cement paste is a suspension of cement particles in water. The different types ofsuper plasticizer have different dispersion. In cement paste with super plasticizer(SP), SPcould adsorb on the surface of cement particles. because of the forces of van der waals,electrostatic repulsion and steric hindrance, the cement particles could maintain dispersedstate. In cement paste with LS, there are the forces of van der waals among cement particles,cement particles are dispersed by the forces of van der waals and electrostatic repulsion incement paste with PNS, however, In cement paste with PC, cement particles are dispersed bythe forces of van der waals , electrostatic repulsion and steric hindrance.

Analysis Report 2

Date: May 1, 2012

To: John Smith

From: Tom Brown

Subject:

Objective

To show that Android system is appropriate for our new software.

Summary

Many users feel difficult to use IOS operating system. Android is easy to use. A large number of applications are developed for Android system. New software using this system will be more popular.

Conclusion

Android system is appropriate for our new software.

Discussion

Recently, smart phone is the most important kind in the phone market. Choosing appropriate operating system is a key point determining sales volume of new software. IOS and Android is the two main kinds of operating system. Compared with IOS, Android has a lower developing cost and a better user experience.

Trip report

Date: January 19 ,2015

From: Zhang Liran

To: Zhao Jiaqi

Subject: The 8th international symposium on concrete and cement

The report discusses the 8th international symposium on concrete and cement inNanjing on September 17. The symposium featured exchange the experiences andresearch progress.

Experiences

two types of super plasticizer have the ability to disperse the cement particles, however,PC has stronger dispersion than others. Viscosity of the samples with PC is almostunchanged with shear stress increasing compared with PNS Research progress

new type super plasticizer is developing, this type is amphoteric, it has strongerdispersion than PC, and can further reduce viscosity.

Laboratory report 1

Date: January 19 ,2014

From: Zhang Liran

To: Zhao Jiaqi

Subject: selection of super plasticizer in cement paste

Introduction

Concrete is the largest amount of artificial materials, the research cement pastepromotes the development of concrete. The rheological property is important performanceof cement paste, thus,It can better understand to the performance of cement paste by determining ofrheological property of cement paste.

Methodology

In this work, the rheological behavior of cement paste with PC or PNS is analyzed bymeasuring apparent viscosity and rate of shear which are measured with viscosimeter.

Results

The results are as shown in figure 1Viscosity of the samples with PC is almost unchanged with shear stress increasing comparedwith PNS.

Discussion

In cement paste with SP, SP could adsorb on the surface of cement particles. Cementparticles are dispersed by the forces of van der waals, electrostatic repulsion and sterichindrance. PC superplasticizer can destroy flocculation structures to large extent.

Conclusion

SP can destroy flocculation structure greatly to increase the fluidity of the paste byrepulsion.

Recommendations

I recommend we can select PC to improve the fluidity of the paste.

laboratory report2

Date: January 19 ,2015

From:Zhang Liran

To: Zhao Jiaqi

Subject:

Introduction

Currently, mine safety is the focal point in mining activity. As a new and advanced approach for geophysical prospecting, the Ground Penetrating Radar (GPR) is used in the mine disaster detection. Purpose

The experiment aims to show whether LSQR is an effective inversion algorithm.

Problem

The complexity of coal mine underground environment, coupled with limitation of detection means, lead to lack of data, so the coefficient matrix is usually large and sparse.

Methodology

A large number of coal seam digital simulation model, including different internal diseases, are established, and the simulation data are processed by using the Least Square QR-factorization (LSQR) inversion algorithm.

Results

The inversion results show good agreements with simulation model feature configurations, and the diseases objects can be detected.

Conclusions

LSQR can be used in solving large and sparse equations.

Recommendations

I recommend finding method to decrease iteration times.

Outline report

Selection of super plasticizer:

PC VS.PNS

January 19, 2015

Researcher Zhang Liran

Purpose to compare PC VS.PNS to determine which is a better superplasticizer.

Method the rheological behavior of cement paste with PC or PNS is analyzedby measuring apparent viscosity and rate of shear which are measuredwith viscosimeter.

Conclusion SP can destroy flocculation structure greatly to increase the fluidity ofthe paste by repulsion. Recommendation I recommend we can select PC to improve the fluidity of the paste.

Recommendation report

Date: January 19 ,2015

From:Zhang Liran

To: Zhao Jiaqi

Subject: recommendation for selection of super plasticizer

Introduction

Concrete is the largest amount of artificial materials, the research cement pastepromotes the development of concrete. The rheological property is important performanceof cement paste, thus,It can better understand to the performance of cement paste by determining ofrheological property of cement paste.

This report is In response to your request for recommendation selection of superplasticizer(SP) in cement paste. The purpose of the report is to review two types of superplasticizer and to recommend the best SP. two types of super plasticizer being reviewedare PNS and PC.In gathering this information, I read many literatures and mode a lotexperiments. I recommend PC.

After long-distance transmission, rheological property of cement paste becomeworse off. This problem will be solved by adding PC super plasticizer, to reduce thecement particles coagulation again.

The remainder of the report will cover the following: conclusion research,recommendation of SP and discussion. Conclusion

Through the performance comparison ,the results are as follows:

1. three types of super plasticizer have the ability to disperse the cement particles,however, PC has stronger dispersion than others.

2. LS has little stability , PNS has a little stability , however, PC has better stability.

Recommendations

I recommend we can select PC to improve the fluidity of the paste.